CN115627549A - A kind of preparation method of nylon 6 filament with high strength and low boiling water shrinkage - Google Patents

Abstract

The invention relates to the technical field of textile chemical fiber preparation, and discloses a method for preparing nylon 6 filaments with high strength and low boiling water shrinkage. Melt plasticization, screw shearing, water cooling pelletizing, vibration screening and vacuum drying process to prepare modified nylon 6 masterbatch; add nylon 6 slices and modified nylon 6 masterbatch to the screw extruder to prepare molten material, molten material Processed by static mixer and spinning machine in turn, the spinning machine sprays out a thin stream of melt from the discharge end; the thin stream of melt passes through the side blowing chamber to cool and solidify into tow, and the tow passes through the first oiler, guide Wire hook, second oiler, pre-netting device, first pair of stretching rollers, second pair of stretching rollers, third pair of stretching rollers, fourth pair of stretching rollers, fifth pair of stretching rollers The roller group and the main network device enter the winding machine for winding, and the tow to be wound is nylon 6 filament with high strength and low boiling water shrinkage.

Description

A kind of preparation method of nylon 6 filament with high strength and low boiling water shrinkage

technical field

The invention relates to a method for preparing nylon 6 filaments with high strength and low boiling water shrinkage, and belongs to the technical field of textile chemical fiber preparation.

Background technique

Polyamide 6 is affected by strong intermolecular hydrogen bonds, which limits the improvement of draft ratio and fiber strength. In recent years, a series of studies have been carried out on the key issues of preparing high-strength nylon 6. At present, the feasible methods mainly include multi-stage drafting, regional heat treatment, solid-phase extrusion, plasticized melt spinning, gel spinning, and dry spinning. Silk, etc., while nylon 6 manufacturers mainly use multi-stage drafting methods to improve fiber strength.

Multi-stage drafting has a significant effect on improving the strength of nylon 6, but as the draft ratio increases, the greater the tensile tension, the greater the tensile stress, and the greater the boiling water shrinkage of the prepared nylon 6. Yarns with large shrinkage in boiling water have the following problems in the downstream application process: (1) severe shrinkage during the dyeing process, which is likely to cause color patterns; (2) large tension differences due to shrinkage during the unwinding process of the package yarn, It is difficult to unwind, and it is easy to cause broken filaments, which increases the difficulty of weaving; (3) The fabric woven from yarns with a large boiling water shrinkage rate has poor shape retention and hard hand feeling. Therefore, the production of nylon 6 filaments with high strength and low boiling water shrinkage is still a challenge.

At present, the invention patent with the Chinese patent authorization announcement number of CN102251324B discloses a production process of high-strength and low-boiling shrinkage nylon 6 special-shaped space-changing yarn, which can make the boiling water shrinkage of nylon 6 The rate is as low as 3%, and the strength reaches 7.11cN/dtex. However, the nylon 6 produced in the early stage has a lot of wool and a high rate of broken ends, which is not suitable for actual production.

The invention patent application with the publication number of Chinese patent application CN112410899A discloses a manufacturing process of high-strength polyamide 6, which can be spun by setting the innovative design of the tow through four drafting and spinning process parameters, and cooperating with high-temperature setting. Nylon 6 high-strength fiber with high strength and good dimensional stability. According to the heat setting mechanism, as the setting temperature increases, the boiling water shrinkage decreases. However, in the actual production process, it is found that under stretching conditions, as the stretching temperature increases, nylon 6 is prone to local lattice fine slippage or melting of crystal regions, and the degree of order decreases, resulting in the fracture strength of nylon 6. decline, so the technology in the patent application CN112410899A is also more difficult to achieve high strength and low boiling water shrinkage.

In view of this situation, it is urgent to solve the problem that the fiber strength of nylon 6 decreases during high-temperature setting under multi-stage drawing conditions. We propose a method for preparing nylon 6 filaments with high strength and low boiling water shrinkage.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, the present invention provides a method for preparing nylon 6 filaments with high strength and low boiling water shrinkage.

Technical scheme of the present invention is as follows:

In the first aspect, a preparation device for nylon 6 filaments with high strength and low boiling water shrinkage, including a raw material storage tank, a batching machine, a screw extruder, a static mixer and a spinning machine, a raw material storage tank and a batching machine for discharging Both ends are connected to the feed end of the screw extruder, the discharge end of the screw extruder is connected with the feed end of the static mixer through a pipe connection, and the discharge end of the static mixer is connected by a pipe connected together with the feed end of the spinning machine, the discharge end of the spinning machine is drawn out with nascent fibers, and the drawn out nascent fibers pass through the first oiler, the guide wire hook, the second After the oiler and pre-netting device, it is threaded into the drawing assembly, and the drawing assembly is used for high-strength drawing of the threaded primary fiber.

Wherein, the stretching assembly includes the first pair of stretching rolls, the second pair of stretching rolls, the third pair of stretching rolls, the fourth pair of stretching rolls, the fifth pair of stretching rolls and the main network device, the as-spun fibers passing through the pre-netting device pass through the first pair of stretching rollers, the second pair of stretching rollers, the third pair of stretching rollers, the fourth pair of stretching rollers, the fifth pair of stretching rollers The stretching roller group and the main network device are passed into the winder afterward.

Wherein, a side blowing chamber is provided at one side of the leading-out section of the as-spun fiber, and the side-blowing chamber is arranged at one side of the leading-out section of the as-spun fiber between the spinning machine and the first oiler.

In the second aspect, a method for preparing nylon 6 filaments with high strength and low boiling water shrinkage of the present invention is characterized in that it includes the use of the aforementioned preparation device for nylon 6 filaments with high strength and low boiling water shrinkage, and also includes the following steps:

Nylon 6 slices, nano-montmorillonite powder and dispersant powder are sequentially subjected to quantitative feeding, melt plasticization, screw shearing, water cooling pelletizing, vibration screening and vacuum drying. A 400-800-mesh filter is added to the head of the shearing machine to control the overall melting temperature of the head to 1.3-1.5MPa, and a modified nylon 6 masterbatch with a relative viscosity of 2.4-2.5 and a water content of ≤500ppm is prepared;

Nylon 6 slices and the modified nylon 6 masterbatch are added to a screw extruder from a raw material storage tank and a batching machine according to a certain proportion to perform high-temperature melting and mixing to form a molten material;

The screw extruder transports the molten material to the static mixer through the connecting pipeline for further mixing, and the uniformly mixed molten material is then transported to the spinning machine through the connecting pipeline, and the spinning machine carries out the melting process on the molten material. After spinning, a thin stream of melt is sprayed from the discharge end;

The melt fine stream is cooled and solidified into tow through the side blowing chamber, and the tow is the as-spun fiber, and the as-spun fiber enters the first oiler for preliminary oiling, then introduces the guide wire hook, and then enters the second oiling Deep oiling of the filter, and then into the pre-networker for even distribution of oil;

After oiling, the primary fiber enters the first pair of stretching rollers, the second pair of stretching rollers, the third pair of stretching rollers, the fourth pair of stretching rollers, and the fifth pair of stretching rollers for multi-stage After drawing and heat setting, it finally enters the winding machine through the main network device for winding. The tow wound in the winding machine is nylon 6 filament with high strength and low boiling water shrinkage.

Wherein, 57-94 parts of the nylon 6 slices are selected, 5-40 parts of the nano-montmorillonite are selected, and 1-3 parts of the dispersant powder are selected.

330等中一种或多种。Wherein, the nylon 6 slices are selected from nylon 6 slices with a relative viscosity of 2.45 to 2.55 and a moisture content of ≤500ppm. The ratio of nylon 6 slices and modified nylon 6 masterbatches is 99:1 to 80:20, and the dispersant powder It is polyurethane, low relative molecular weight copolyamide, single-type hyperdispersant powder

One or more of 330 etc.

Wherein, when the nylon 6 chips, nano-montmorillonite powder and dispersant powder are melted and plasticized, they are carried out in a twin-screw extruder, and the twin-screw extruder is divided into eleven sections of temperature zones and head temperature zones. Zone, the first temperature zone is 210~245℃, the second temperature zone is 215～245℃, the third temperature zone is 220～245℃, the fourth, fifth and sixth temperature zones are 215～240℃, the seventh zone Temperature zone 200～215℃, temperature zone 8 200～215℃, temperature zone 9 195～205℃, temperature zone 10 190～205℃, temperature zone 11 180～190℃, machine head Temperature zone 250～260℃.

Wherein, the high-temperature melting temperature of the screw extruder is 240-270°C.

Wherein, the side blowing temperature of the side blowing chamber is 20-24°C, the wind speed is 0.35-0.5m/s, and the first oiler and the second oiler both use JT-014 type oil agent, oil agent The concentration is between 25% and 40%, and the amount of oil is kept between 1.0% and 1.6%.

Wherein, the temperature of the first pair of stretching rolls is 50-60°C, the temperature of the second pair of stretching rolls is 160-170°C, the draft ratio is 3.0-4.0, and the temperature of the third pair of stretching rolls is 170°C. ~200°C, the drafting ratio is 1.2~1.3, the temperature of the fourth pair of stretching rollers is 175~220°C, the drafting ratio is 1..1~1.2, and the temperature of the fifth pair of stretching rollers is 170~200°C , The four-level draft ratio is 0.9 to 1.0.

The present invention has following beneficial effects:

1. The present invention forms a covalent bond by utilizing the carboxyl functional group grafted on the surface of nano-montmorillonite and polyamide 6 molecules to form a covalent bond, so as to improve the compatibility of nano-montmorillonite and nylon 6 molecules. The sheet structure of nano-montmorillonite, when the nylon 6 molecular chain is subjected to tensile stress, can effectively transfer the stress to the nano-montmorillonite sheet, at this time, the nano-montmorillonite sheet acts as a load-bearing stress and enhances the fiber strength. Moreover, a certain content of nano-montmorillonite has a heterogeneous nucleation effect, which can effectively increase the crystallization rate of nylon 6 molecules under high temperature conditions, can promote nylon 6 molecules to directly enter the rapid growth stage of lamellae, and improve the crystallization rate of nylon 6 molecules. Crystallization regularity and crystallinity can effectively reduce the fine slippage of the local lattice of nylon 6 molecules during the high-temperature setting process, thereby improving the fiber fracture strength. The phenomenon of melting of the crystal region and the advantages of ensuring strength.

2. The present invention sets the first pair of stretching rollers, the second pair of stretching rollers, the third pair of stretching rollers, the fourth pair of stretching rollers and the fifth pair of stretching rollers, and adopts 5 roads The high temperature setting of the roller group has the advantages of enhancing the degree of heat setting, improving the dimensional stability of the fiber, and reducing the shrinkage in boiling water.

Description of drawings

Fig. 1 is the structural representation of the preparation device of nylon 6 filament of middle and high strength low boiling water shrinkage of the present invention;

The reference signs in the figure represent:

1. Raw material storage tank; 2. Batching machine; 3. Screw extruder; 4. Static mixer; 5. Spinning machine; 6. Primary fiber; 7. First oiler; 8. Guide wire hook; 9 , the second oiler; 10, the pre-network device; 11, the first pair of pulling rollers; 12, the second pair of pulling rollers; 13, the third pair of pulling rollers; 14, the fourth pair of pulling rollers; 15 , the fifth pair of pulling rollers; 16, the main network device; 17, the winding machine; 18, the side blowing room;.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1:

Please refer to Fig. 1, the present embodiment provides a kind of preparation device of nylon 6 filament of high strength and low boiling water shrinkage rate, comprise raw material storage tank, batching machine, screw extruder, static mixer and spinning machine, raw material storage tank and The batching machine is equipped with materials required for the preparation of nylon 6 filaments with high strength and low boiling water shrinkage. The screw extruder 3, the static mixer 4 and the spinning machine 5 are used for the extrusion process, the mixing process and the spinning process respectively. These are all common machinery in the prior art, specifically can refer to the utility model content that Chinese patent authorization announcement number is CN210237858U.

Raw material storage tank, batching, screw extruder, static mixer and spinning machine, when in use, the discharge end of raw material storage tank and batching machine are all connected to the feeding end of the screw extruder, and the screw extruder The discharge end of the static mixer is connected with the feed end of the static mixer through a pipeline connection, and the discharge end of the static mixer is connected with the feed end of the spinning machine through a pipeline connection, so that from raw material storage The material discharged from the discharge end of the tank and the batching machine can enter the screw extruder, where it is melted at high temperature in the screw extruder and can be further mixed in the static mixer after extrusion. After the mixing is completed, it can enter the spinning The spinning process is carried out in the machine.

From the discharge end of the spinning machine, the as-spun fibers obtained by the spinning process are drawn outwards. The drawn-out as-spun fibers can be multiple, and the specific number can be determined according to the actual situation. The drawn-out as-spun fibers pass through the first upper After the oiler, guide wire hook, second oiler, and pre-netting device are threaded into the drawing assembly, the drawing assembly is used for high-strength drawing of the inserted primary fiber;

In this embodiment, the quantity of the first oiler, guide wire hook and second oiler is determined according to the actual number of primary fibers, satisfying that one primary fiber corresponds to one first oiler, one guide wire hook 8 and one The second oiler, the first oiler and the second oiler can oil the nascent fiber passing through, and the guide wire hook is used to fix the nascent fiber passing through; The number of networkers is 1, and all the raw fibers drawn out pass through the pre-networker, and the pre-networker can play the role of spreading oil and bundling the passing through primary fibers;

In this embodiment, the stretching assembly includes the first pair of stretching rollers, the second pair of stretching rollers, the third pair of stretching rollers, the fourth pair of stretching rollers, the fifth pair of stretching rollers and the main Networking machine, wherein the two stretching rolls in the first pair of stretching rolls are a hot roll and a cold roll, the diameter ratio of the cold roll to the hot roll is 1:1.5~3, and the second pair of stretching rolls The two stretching rolls in the group are also a hot roll and a cold roll, here the diameter ratio of the cold roll to the hot roll is also 1:1.5~3, the third pair of stretching rolls, the fourth pair of stretching rolls The two draft rolls of roll set and the 5th pair of draw roll sets are hot rolls, and diameter is identical; During the drafting process of the roller group 12, a higher draft ratio is configured to carry out sufficient drafting to improve the fiber strength as much as possible, and the other pairs of stretching roller groups are configured with a low draft ratio to fully heat and shape the fibers; The primary fibers passed through the pre-internet pass through the first pair of stretching rollers, the second pair of stretching rollers, the third pair of stretching rollers, the fourth pair of stretching rollers, and the fifth pair of stretching rollers and the main network device and then penetrate into the winder for winding; the first pair of stretching rollers, the second pair of stretching rollers 12, the third pair of stretching rollers 13, the fourth pair of stretching rollers 14 1. The fifth pair of stretching rollers 15 can carry out high-stretching and heat-setting to the passing spun fibers 6, and the main network device 16 can further bundle the passing spun fibers 6, so that they finally enter the winder The primary fiber 6 that is rolled up in 17 is the required high-strength nylon 6.

Simultaneously, one side of the lead-out section of the as-spun fiber is provided with a side blowing chamber, and the side blowing chamber is arranged on one side of the lead-out section of the as-spun fiber between the spinning machine and the first oiler, and the blowing port of the side blowing chamber faces the nascent fiber. The fiber is set, and the side blowing chamber can pass cold air outwards, so as to be able to cool the nascent fibers as required.

Example 2:

The present embodiment provides a kind of preparation method of high-strength low-boiling water shrinkage nylon 6 filament, including using the preparation device of a kind of high-strength low boiling water shrinkage nylon 6 filament provided in Example 1, also includes the following steps:

Step S1: 57-94 parts of nylon 6 slices, 5-40 parts of nano-montmorillonite powder and 1-3 parts of dispersant powder are sequentially subjected to quantitative feeding, melt plasticization, screw shearing, water-cooled granulation, vibration screening and vacuum In the drying process, before entering the screw shear through melting and plasticization, a 400-800 mesh filter is added to the head of the screw shear main engine to control the overall melting pressure temperature of the machine head to 1.3-1.5MPa, and the relative viscosity is 2.4- 2.5. Modified nylon 6 masterbatch with moisture content ≤ 500ppm; Among them, the quantitative feeding adopts the method of linkage feeding between the main feeding position and the side feeding position, adding nylon 6 slices to the main feeding position, and adding nano-montmorillonite to the side feeding position Soil powder and dispersant powder, the host speed of the screw shearing is preferably 540-580r/min, the host speed of the water-cooled pelletizer is preferably 850-1000r/min, and the diameter of the sieve mesh for vibration screening is preferably 2-580r/min. 8mm;

Step S2: adding nylon 6 slices and modified nylon 6 masterbatches to a screw extruder according to a certain proportion from a raw material storage tank and a batching machine for high-temperature melting and mixing to form a molten material;

Step S3: The screw extruder transports the molten material to the static mixer through the connecting pipeline for further mixing, and the uniformly mixed molten material is then transported to the spinning machine through the connecting pipeline, and the spinning machine performs spinning work on the molten material Finally, a thin stream of melt is sprayed from the discharge end;

Step S4: The fine flow of the melt passes through the side blowing chamber to cool and solidify into tows, the tows are primary fibers, and the primary fibers enter the first oiler for preliminary oiling, then introduce the guide wire hooks, and then enter the second oiler Carry out in-depth oiling, and then enter the pre-networker for even oil distribution;

Step S5: The virgin fiber after oiling enters the first pair of stretching rollers, the second pair of stretching rollers, the third pair of stretching rollers, the fourth pair of stretching rollers, and the fifth pair of stretching rollers After multi-stage drawing and heat setting, it finally enters the winding machine through the main network device for winding. The tow wound in the winding machine is nylon 6 filament with high strength and low boiling water shrinkage.

In this embodiment, nylon 6 slices with a relative viscosity of 2.45 to 2.55 and a moisture content of ≤500 ppm are selected as nylon 6 slices, and nylon 6 slices with a relative viscosity of 2.5±0.1 and a moisture content of 450 to 500 ppm are preferred.

In this embodiment, nylon 6 slices are selected as one of glossy, semi-glossy and full-dull, and glossy nylon 6 slices can be preferred.

In this embodiment, the modified nano-montmorillonite with a particle size of 600-800 nm and carboxyl group is selected as the nano-montmorillonite.

330等中一种或多种。In this embodiment, the dispersant powder is selected from polyurethane, low relative molecular weight copolyamide, single-type hyperdispersant powder

One or more of 330 etc.

In the present embodiment, in step S1, nylon 6 slices, nano-montmorillonite powder and dispersant powder are melted and plasticized in a common twin-screw extruder in the prior art, and the twin-screw extruder is selected In the prior art, there are twin-screw extruders with eleven temperature zones and head temperature zones. The first temperature zone of the twin-screw extruder is 210-245 °C, and the second temperature zone is 215-245 °C. , the third temperature zone is 220～245℃, the fourth, fifth and sixth temperature zones are 215～240℃, the seventh temperature zone is 200～215℃, the eighth temperature zone is 200～215℃, the ninth temperature zone 195～205℃, the temperature zone of the tenth section is 190～205℃, the temperature zone of the eleventh section is 180～190℃, and the temperature zone of the machine head is 250～260℃.

In this embodiment, the high-temperature melting temperature of the screw extruder is 240-270°C, so that the melting temperature of the nylon 6 slices and the modified nylon 6 masterbatch in step S2 is 240-270°C.

In this embodiment, the ratio of nylon 6 slices to modified nylon 6 masterbatch is 99:1-80:20, preferably 99:1-90:10, more preferably 97:3-95:5.

In this embodiment, when the spinning machine ejects a thin stream of melt from the discharge end, the size of the thin stream of melt ejected can be determined by setting a common spinneret in the prior art on the discharge end of the spinning machine. Quantity, the shape of the nozzle hole on the selected spinneret can be round, triangular, flat, or cross-shaped, and the number of holes is 12-96f. It is preferable that the shape of the nozzle hole is circular and the number of holes is 12-48f spinneret.

In this embodiment, the side blowing temperature of the side blowing chamber is 20-24°C, and the wind speed is 0.35-0.5m/s;

In this embodiment, both the first oiler and the second oiler use JT-014 type oil agent, the concentration of the oil agent is between 25% and 40%, and the amount of oil on the tow is kept between 1.0% and 1.6%.

In this embodiment, the temperature of the first pair of stretching rolls is 50-60°C, the temperature of the second pair of stretching rolls is 160-170°C, the draft ratio is 3.0-4.0, and the temperature of the third pair of stretching rolls is 170～200℃, the draft ratio is 1.2～1.3, the temperature of the fourth pair of stretching rollers is 175～220℃, the draft ratio is 1..1～1.2, the temperature of the fifth pair of stretching rollers is 170～200 ℃, the four-stage drafting ratio is 0.9-1.0; so that the as-spun fibers entering the drawing assembly can be drawn between the first pair of drawing rollers and the second pair of drawing rollers, and then Perform secondary stretching between the second pair of stretching rollers and the third pair of stretching rollers and perform the first heat setting, and then perform between the third pair of stretching rollers and the fourth pair of stretching rollers Three-stage stretching and second heat setting, followed by four-stage stretching and third heat setting between the fourth pair of drawing rollers and the fifth pair of drawing rollers, so that the final as-spun fibers can be Four times of stretching and three times of heat setting are carried out, and the finally obtained nascent fibers can be formed into high-strength and low-boiling water shrinkage nylon 6 filaments when they enter the winding machine through the main network device.

In this embodiment, the as-spun fibers entering the drawing assembly are drawn between the first pair of drawing rollers, the second pair of drawing rollers, the third drawing rollers, the fourth drawing rollers and the fifth drawing rollers The number of wire windings on the hot roller can be 4.5 to 6.5 turns.

Example 3:

80 parts of nylon 6 slices, 18 parts of nano-montmorillonite powder and 2 parts of dispersant powder are sequentially subjected to quantitative feeding, melt plasticization, screw shearing, water-cooled pelletizing, vibration screening and vacuum drying processes. Before the screw shearing, add a 600-mesh filter to the head of the screw shearing machine to control the overall melting temperature of the machine head to 1.4MPa, and prepare a modified nylon 6 masterbatch with a relative viscosity of 2.14 and a water content of 490ppm;

In this embodiment, the quantitative feeding adopts the linkage feeding method of the main feeding position and the side feeding position. The main feeding position adds nylon 6 slices, and the side feeding position adds nano-montmorillonite powder and dispersant powder. The host speed is 560r/min, the host speed of the water-cooled granulator is preferably 900r/min, and the diameter of the screen hole for vibration screening is preferably 5mm;

In the present embodiment, nylon 6 chips, nanometer montmorillonite powder and dispersant powder are melted and plasticized in a common twin-screw extruder in the prior art, and the twin-screw extruder is divided into eleven sections of temperature. temperature zone and head temperature zone, the first temperature zone is 215°C, the second temperature zone is 225°C, the third temperature zone is 240°C, the fourth, fifth and sixth temperature zones are 235°C, and the seventh temperature zone is 210°C ℃, the temperature zone of the eighth section is 205℃, the temperature zone of the ninth section is 200℃, the temperature zone of the tenth section is 195℃, the temperature zone of the eleventh section is 190℃, and the temperature zone of the machine head is 255℃.

In this embodiment, the nylon 6 slices are selected as glossy nylon 6 slices.

In this embodiment, the modified nano-montmorillonite with a particle size of 650 nm and carboxyl group is selected as the nano-montmorillonite.

330。In this embodiment, the dispersant powder is selected as a single hyperdispersant powder

330.

Example 4:

Add 95% nylon 6 slices and 5% modified nylon 6 masterbatch from the raw material storage tank and batching machine to the screw extruder for high-temperature melting and mixing, and the modified nylon 6 masterbatch used is prepared in Example 3 Modified nylon 6 masterbatch, the screw extruder is selected as a screw extruder with five-zone temperature common in the prior art, and the temperature of the first, second, third, fourth and fifth zones of the screw extruder The melting temperatures are 245°C, 250°C, 255°C, 259°C, and 260°C;

The screw extruder transports the molten material to the static mixer through the melt distribution pipeline, and then transports it to the spinning machine through the melt distribution pipeline. After the spinning machine spins the molten material, it sprays out the molten material from the discharge end. body trickle;

The melt fine flow passes through the side blowing room with a temperature of 22.5°C, a wind speed of 0.5m/s, and a relative humidity of 85% to cool and solidify into tow, and the tow enters the first oiler with an oil distribution concentration of 30% for preliminary Apply oil, then introduce the wire guide hook, then enter the second oiler with an oil distribution concentration of 30% for deep oiling, and then enter the pre-netting device to make the oiling agent adhere to the tow more evenly;

The oiled tow enters the first pair of drawing rollers through the godet roller, and then performs secondary drawing between the second pair of drawing rollers and the third pair of drawing rollers and performs the first Secondary heat setting, followed by three-stage stretching between the third pair of stretching rollers and the fourth pair of stretching rollers and second heat setting, then between the fourth pair of stretching rollers and the fifth pair of stretching rollers Four-stage drawing is carried out between stretching roller groups and the third heat setting is carried out. After multi-stage drawing and heat setting, the tow enters the winder through the main network device to form high-strength and low boiling water shrinkage nylon 6 filaments.

The various properties of the high-strength low-boiling water shrinkage nylon 6 filament obtained in this embodiment are shown in Table 5.

Wherein, the winding process in this embodiment is shown in Table 1.

Table 1 The winding process of high strength and low boiling water shrinkage nylon 6 filament (40D/12F) in this implementation case

equipment temperature(°C) speed(m/min) Number of coils The first pair of stretching rollers 50 1000 5.5 The second pair of stretching rollers 162 3150 5.5 The third pair of stretching rollers 172 3870 5.5 The fourth pair of stretching rollers 177 4380 5.5 The fifth pair of stretching rollers 172 4330 5.5 Winding machine / 4200 /

Example 5:

100% nylon 6 chips are added from the raw material storage tank to the screw extruder for high-temperature melting and mixing. The screw extruder is selected as a screw extruder with five zones of temperature common in the prior art. The melting temperatures of zone 1, zone 2, zone 3, zone 4 and zone 5 are 245°C, 250°C, 255°C, 259°C, 260°C respectively;

The screw extruder transports the molten material to the static mixer through the melt distribution pipeline, and then transports it to the spinning machine through the melt distribution pipeline. After the spinning machine spins the molten material, it sprays out the molten material from the discharge end. body trickle;

The melt fine flow passes through the side blowing room with a temperature of 22.5°C, a wind speed of 0.5m/s, and a relative humidity of 85% to cool and solidify into tow, and the tow enters the first oiler with an oil distribution concentration of 30% for preliminary Apply oil, then introduce the wire guide hook, then enter the second oiler with an oil distribution concentration of 30% for deep oiling, and then enter the pre-netting device to make the oiling agent adhere to the tow more evenly;

The oiled tow enters the first pair of drawing rollers through the godet roller, and then performs secondary drawing between the second pair of drawing rollers and the third pair of drawing rollers and performs the first Secondary heat setting, followed by three-stage stretching between the third pair of stretching rollers and the fourth pair of stretching rollers and second heat setting, then between the fourth pair of stretching rollers and the fifth pair of stretching rollers Four-stage drawing is carried out between stretching roller groups and the third heat setting is carried out. After multi-stage drawing and heat setting, the tow enters the winder through the main network device to form high-strength and low boiling water shrinkage nylon 6 filaments.

The various properties of the high-strength low-boiling water shrinkage nylon 6 filament obtained in this embodiment are shown in Table 5.

Wherein, the winding process in this embodiment is also shown in Table 1.

Embodiment 6:

Add 95% nylon 6 slices and 5% modified nylon 6 masterbatch from the raw material storage tank and batching machine to the screw extruder for high-temperature melting and mixing, and the modified nylon 6 masterbatch used is prepared in Example 3 Modified nylon 6 masterbatch, the screw extruder is selected as a screw extruder with five-zone temperature common in the prior art, and the temperature of the first, second, third, fourth and fifth zones of the screw extruder The melting temperatures are 245°C, 250°C, 255°C, 259°C, and 260°C;

The screw extruder transports the molten material to the static mixer through the melt distribution pipeline, and then transports it to the spinning machine through the melt distribution pipeline. After the spinning machine spins the molten material, it sprays out the molten material from the discharge end. body trickle;

The melt fine flow passes through the side blowing room with a temperature of 22.5°C, a wind speed of 0.5m/s, and a relative humidity of 85% to cool and solidify into tow, and the tow enters the first oiler with an oil distribution concentration of 30% for preliminary Oiling, and then introducing the guide wire hook, and then entering the second oiling device with an oil distribution concentration of 30% for deep oiling, and then entering the pre-netting device to make the oiling agent adhere to the tow more evenly;

The oiled tow enters the first pair of drawing rollers through the godet roller, and then performs secondary drawing between the second pair of drawing rollers and the third pair of drawing rollers and performs the first Secondary heat setting, followed by three-stage stretching between the third pair of stretching rollers and the fourth pair of stretching rollers and second heat setting, then between the fourth pair of stretching rollers and the fifth pair of stretching rollers Four-stage drawing is carried out between stretching roller groups and the third heat setting is carried out. After multi-stage drawing and heat setting, the tow enters the winder through the main network device to form high-strength and low boiling water shrinkage nylon 6 filaments.

The various properties of the high-strength low-boiling water shrinkage nylon 6 filament obtained in this embodiment are shown in Table 5.

Wherein, the winding process in this embodiment is shown in Table 2.

Table 2 Winding process of nylon 6 filament (40D/12F) with high strength and low boiling water shrinkage in this implementation case

Embodiment 7:

Add 100% polyamide 6 slices from the raw material storage tank to the screw extruder for high-temperature melting and mixing. The screw extruder is selected as a screw extruder with five zones of temperature commonly used in the prior art. One of the screw extruders The melting temperatures of zone, zone 2, zone 3, zone 4 and zone 5 are 245°C, 250°C, 255°C, 259°C, 260°C respectively;

The screw extruder transports the molten material to the static mixer through the melt distribution pipeline, and then transports it to the spinning machine through the melt distribution pipeline. After the spinning machine spins the molten material, it sprays out the molten material from the discharge end. body trickle;

The melt fine flow passes through the side blowing room with a temperature of 22.5°C, a wind speed of 0.5m/s, and a relative humidity of 85% to cool and solidify into tow, and the tow enters the first oiler with an oil distribution concentration of 30% for preliminary Apply oil, then introduce the wire guide hook, then enter the second oiler with an oil distribution concentration of 30% for deep oiling, and then enter the pre-netting device to make the oiling agent adhere to the tow more evenly;

The oiled tow enters the first pair of drawing rollers through the godet roller, and then performs secondary drawing between the second pair of drawing rollers and the third pair of drawing rollers and performs the first Secondary heat setting, followed by three-stage stretching between the third pair of stretching rollers and the fourth pair of stretching rollers and second heat setting, then between the fourth pair of stretching rollers and the fifth pair of stretching rollers Four-stage drawing is carried out between stretching roller groups and the third heat setting is carried out. After multi-stage drawing and heat setting, the tow enters the winder through the main network device to form high-strength and low boiling water shrinkage nylon 6 filaments.

The various properties of the high-strength low-boiling water shrinkage nylon 6 filament obtained in this embodiment are shown in Table 5.

Wherein, the winding process in this embodiment is also shown in Table 2.

Embodiment 8:

Add 95% nylon 6 slices and 5% modified nylon 6 masterbatch from the raw material storage tank and batching machine to the screw extruder for high-temperature melting and mixing, and the modified nylon 6 masterbatch used is prepared in Example 3 Modified nylon 6 masterbatch, the screw extruder is selected as a screw extruder with five-zone temperature common in the prior art, and the temperature of the first, second, third, fourth and fifth zones of the screw extruder The melting temperatures are 245°C, 250°C, 255°C, 259°C, and 260°C;

The screw extruder transports the molten material to the static mixer through the melt distribution pipeline, and then transports it to the spinning machine through the melt distribution pipeline. After the spinning machine spins the molten material, it sprays out the molten material from the discharge end. body trickle;

The melt fine flow passes through the side blowing room with a temperature of 22.5°C, a wind speed of 0.5m/s, and a relative humidity of 85% to cool and solidify into tow, and the tow enters the first oiler with an oil distribution concentration of 30% for preliminary Oiling, and then introducing the guide wire hook, and then entering the oil distribution concentration of 30% to carry out deep oiling for the second oiler, and then entering the pre-netting device to make the oiling agent adhere to the tow more evenly;

The oiled tow enters the first pair of drawing rollers through the godet roller, and then performs secondary drawing between the second pair of drawing rollers and the third pair of drawing rollers and performs the first Secondary heat setting, followed by three-stage stretching between the third pair of stretching rollers and the fourth pair of stretching rollers and second heat setting, then between the fourth pair of stretching rollers and the fifth pair of stretching rollers Four-stage drawing is carried out between stretching roller groups and the third heat setting is carried out. After multi-stage drawing and heat setting, the tow enters the winder through the main network device to form high-strength and low boiling water shrinkage nylon 6 filaments.

The various properties of the high-strength low-boiling water shrinkage nylon 6 filament obtained in this embodiment are shown in Table 5.

Wherein, the winding process in this embodiment is shown in Table 3.

Table 3 Winding process of nylon 6 filament (40D/12F) with high strength and low boiling water shrinkage in this implementation case

equipment temperature(°C) speed(m/min) Number of coils The first pair of stretching rollers 50 1000 5.5 The second pair of stretching rollers 175 3150 5.5 The third pair of stretching rollers 195 3870 5.5 The fourth pair of stretching rollers 210 4380 5.5 The fifth pair of stretching rollers 205 4330 5.5 Winding machine / 4200 /

Embodiment 9:

Add 100% polyamide 6 slices from the raw material storage tank to the screw extruder for high-temperature melting and mixing. The screw extruder is selected as a screw extruder with five zones of temperature commonly used in the prior art. One of the screw extruders The melting temperatures of zone, zone 2, zone 3, zone 4 and zone 5 are 245°C, 250°C, 255°C, 259°C, 260°C respectively;

The screw extruder transports the molten material to the static mixer through the melt distribution pipeline, and then transports it to the spinning machine through the melt distribution pipeline. After the spinning machine spins the molten material, it sprays out the molten material from the discharge end. body trickle;

The melt fine flow passes through the side blowing room with a temperature of 22.5°C, a wind speed of 0.5m/s, and a relative humidity of 85% to cool and solidify into tow, and the tow enters the first oiler with an oil distribution concentration of 30% for preliminary Apply oil, then introduce the wire guide hook, then enter the second oiler with an oil distribution concentration of 30% for deep oiling, and then enter the pre-netting device to make the oiling agent adhere to the tow more evenly;

The oiled tow enters the first pair of drawing rollers through the godet roller, and then performs secondary drawing between the second pair of drawing rollers and the third pair of drawing rollers and performs the first Secondary heat setting, followed by three-stage stretching between the third pair of stretching rollers and the fourth pair of stretching rollers and second heat setting, then between the fourth pair of stretching rollers and the fifth pair of stretching rollers Four-stage drawing is carried out between stretching roller groups and the third heat setting is carried out. After multi-stage drawing and heat setting, the tow enters the winder through the main network device to form high-strength and low boiling water shrinkage nylon 6 filaments.

The various properties of the high-strength low-boiling water shrinkage nylon 6 filament obtained in this embodiment are shown in Table 5.

Wherein, the winding process in this embodiment is also shown in Table 3.

Example 10:

Add 95% nylon 6 slices and 5% modified nylon 6 masterbatch from the raw material storage tank and batching machine to the screw extruder for high-temperature melting and mixing, and the modified nylon 6 masterbatch used is prepared in Example 3 Modified nylon 6 masterbatch, the screw extruder is selected as a screw extruder with five-zone temperature common in the prior art, and the temperature of the first, second, third, fourth and fifth zones of the screw extruder The melting temperatures are 245°C, 250°C, 255°C, 259°C, and 260°C;

The screw extruder transports the molten material to the static mixer through the melt distribution pipeline, and then transports it to the spinning machine through the melt distribution pipeline. After the spinning machine spins the molten material, it sprays out the molten material from the discharge end. body trickle;

The melt fine flow passes through the side blowing room with a temperature of 22.5°C, a wind speed of 0.5m/s, and a relative humidity of 85% to cool and solidify into tow, and the tow enters the first oiler with an oil distribution concentration of 30% for preliminary Apply oil, then introduce the wire guide hook, then enter the second oiler with an oil distribution concentration of 30% for deep oiling, and then enter the pre-netting device to make the oiling agent adhere to the tow more evenly;

The oiled tow enters the first pair of drawing rollers through the godet roller, and then performs secondary drawing between the second pair of drawing rollers and the third pair of drawing rollers and performs the first Secondary heat setting, followed by three-stage stretching between the third pair of stretching rollers and the fourth pair of stretching rollers and second heat setting, then between the fourth pair of stretching rollers and the fifth pair of stretching rollers Four-stage drawing is carried out between stretching roller groups and the third heat setting is carried out. After multi-stage drawing and heat setting, the tow enters the winder through the main network device to form high-strength and low boiling water shrinkage nylon 6 filaments.

The various properties of the high-strength low-boiling water shrinkage nylon 6 filament obtained in this embodiment are shown in Table 5.

Wherein, the winding process in this embodiment is shown in Table 4.

Table 4 The winding process of high-strength and low-boiling water shrinkage nylon 6 filament (40D/12F) in this implementation case

equipment temperature(°C) speed(m/min) Number of coils first pair of hot rollers 50 1000 5.5 Second pair of hot rollers 175 3150 5.5 The third pair of hot rollers 195 3870 5.5 The fourth pair of hot rollers 210 4380 5.5 The fifth pair of hot rollers 215 4330 5.5 Winding device / 4200 /

Example 11:

Add 100% polyamide 6 slices from the raw material storage tank to the screw extruder for high-temperature melting and mixing. The screw extruder is selected as a screw extruder with five zones of temperature commonly used in the prior art. One of the screw extruders The melting temperatures of zone, zone 2, zone 3, zone 4 and zone 5 are 245°C, 250°C, 255°C, 259°C, 260°C respectively;

The screw extruder transports the molten material to the static mixer through the melt distribution pipeline, and then transports it to the spinning machine through the melt distribution pipeline. After the spinning machine spins the molten material, it sprays out the molten material from the discharge end. body trickle;

The melt fine flow passes through the side blowing room with a temperature of 22.5°C, a wind speed of 0.5m/s, and a relative humidity of 85% to cool and solidify into tow, and the tow enters the first oiler with an oil distribution concentration of 30% for preliminary Apply oil, then introduce the wire guide hook, then enter the second oiler with an oil distribution concentration of 30% for deep oiling, and then enter the pre-netting device to make the oiling agent adhere to the tow more evenly;

The oiled tow enters the first pair of drawing rollers through the godet roller, and then performs secondary drawing between the second pair of drawing rollers and the third pair of drawing rollers and performs the first Secondary heat setting, followed by three-stage stretching between the third pair of stretching rollers and the fourth pair of stretching rollers and second heat setting, then between the fourth pair of stretching rollers and the fifth pair of stretching rollers Four-stage drawing is carried out between stretching roller groups and the third heat setting is carried out. After multi-stage drawing and heat setting, the tow enters the winder through the main network device to form high-strength and low boiling water shrinkage nylon 6 filaments.

The various properties of the high-strength low-boiling water shrinkage nylon 6 filament obtained in this embodiment are shown in Table 5.

Wherein, the winding process in this embodiment is also shown in Table 4.

Example 12:

Add 97.5% nylon 6 slices and 2.5% modified nylon 6 masterbatch from the raw material storage tank and batching machine to the screw extruder for high-temperature melting and mixing, and the modified nylon 6 masterbatch used is prepared in Example 3 Modified nylon 6 masterbatch, the screw extruder is selected as a screw extruder with five-zone temperature common in the prior art, and the temperature of the first, second, third, fourth and fifth zones of the screw extruder The melting temperatures are 245°C, 250°C, 255°C, 259°C, and 260°C;

The screw extruder transports the molten material to the static mixer through the melt distribution pipeline, and then transports it to the spinning machine through the melt distribution pipeline. After the spinning machine spins the molten material, it sprays out the molten material from the discharge end. body trickle;

The melt fine flow passes through the side blowing room with a temperature of 22.5°C, a wind speed of 0.5m/s, and a relative humidity of 85% to cool and solidify into tow, and the tow enters the first oiler with an oil distribution concentration of 30% for preliminary Apply oil, then introduce the wire guide hook, then enter the second oiler with an oil distribution concentration of 30% for deep oiling, and then enter the pre-netting device to make the oiling agent adhere to the tow more evenly;

The oiled tow enters the first pair of drawing rollers through the godet roller, and then performs secondary drawing between the second pair of drawing rollers and the third pair of drawing rollers and performs the first Secondary heat setting, followed by three-stage stretching between the third pair of stretching rollers and the fourth pair of stretching rollers and second heat setting, then between the fourth pair of stretching rollers and the fifth pair of stretching rollers Four-stage drawing is carried out between stretching roller groups and the third heat setting is carried out. After multi-stage drawing and heat setting, the tow enters the winder through the main network device to form high-strength and low boiling water shrinkage nylon 6 filaments.

The various properties of the high-strength low-boiling water shrinkage nylon 6 filament obtained in this embodiment are shown in Table 5.

Wherein, the winding process in this embodiment is also shown in Table 4.

Example 13:

Add 90% nylon 6 chips and 10% modified nylon 6 masterbatch from the raw material storage tank and batching machine to the screw extruder for high-temperature melting and mixing, and the modified nylon 6 masterbatch used is prepared in Example 3 Modified nylon 6 masterbatch, the screw extruder is selected as a screw extruder with five-zone temperature common in the prior art, and the temperature of the first, second, third, fourth and fifth zones of the screw extruder The melting temperatures are 245°C, 250°C, 255°C, 259°C, and 260°C;

The screw extruder transports the molten material to the static mixer through the melt distribution pipeline, and then transports it to the spinning machine through the melt distribution pipeline. After the spinning machine spins the molten material, it sprays out the molten material from the discharge end. body trickle;

The melt fine flow passes through the side blowing room with a temperature of 22.5°C, a wind speed of 0.5m/s, and a relative humidity of 85% to cool and solidify into tow, and the tow enters the first oiler with an oil distribution concentration of 30% for preliminary Apply oil, then introduce the wire guide hook, then enter the second oiler with an oil distribution concentration of 30% for deep oiling, and then enter the pre-netting device to make the oiling agent adhere to the tow more evenly;

The oiled tow enters the first pair of drawing rollers through the godet roller, and then performs secondary drawing between the second pair of drawing rollers and the third pair of drawing rollers and performs the first Secondary heat setting, followed by three-stage stretching between the third pair of stretching rollers and the fourth pair of stretching rollers and second heat setting, then between the fourth pair of stretching rollers and the fifth pair of stretching rollers Four-stage drawing is carried out between stretching roller groups and the third heat setting is carried out. After multi-stage drawing and heat setting, the tow enters the winder through the main network device to form high-strength and low boiling water shrinkage nylon 6 filaments.

The various properties of the high-strength low-boiling water shrinkage nylon 6 filament obtained in this embodiment are shown in Table 5.

Wherein, the winding process in this embodiment is also shown in Table 4.

Example 14:

Add 85% nylon 6 slices and 15% modified nylon 6 masterbatch from the raw material storage tank and batching machine to the screw extruder for high-temperature melting and mixing, and the modified nylon 6 masterbatch used is prepared in Example 3 Modified nylon 6 masterbatch, the screw extruder is selected as a screw extruder with five-zone temperature common in the prior art, and the temperature of the first, second, third, fourth and fifth zones of the screw extruder The melting temperatures are 245°C, 250°C, 255°C, 259°C, and 260°C;

The screw extruder transports the molten material to the static mixer through the melt distribution pipeline, and then transports it to the spinning machine through the melt distribution pipeline. After the spinning machine spins the molten material, it sprays out the molten material from the discharge end. body trickle;

The melt fine flow passes through the side blowing room with a temperature of 22.5°C, a wind speed of 0.5m/s, and a relative humidity of 85% to cool and solidify into tow, and the tow enters the first oiler with an oil distribution concentration of 30% for preliminary Apply oil, then introduce the wire guide hook, then enter the second oiler with an oil distribution concentration of 30% for deep oiling, and then enter the pre-netting device to make the oiling agent adhere to the tow more evenly;

The oiled tow enters the first pair of drawing rollers through the godet roller, and then performs secondary drawing between the second pair of drawing rollers and the third pair of drawing rollers and performs the first Secondary heat setting, followed by three-stage stretching between the third pair of stretching rollers and the fourth pair of stretching rollers and second heat setting, then between the fourth pair of stretching rollers and the fifth pair of stretching rollers Four-stage drawing is carried out between stretching roller groups and the third heat setting is carried out. After multi-stage drawing and heat setting, the tow enters the winder through the main network device to form high-strength and low boiling water shrinkage nylon 6 filaments.

The various properties of the high-strength low-boiling water shrinkage nylon 6 filament obtained in this embodiment are shown in Table 5.

Wherein, the winding process in this embodiment is shown in Table 5.

The performance of product in the embodiment of table 5 and comparative example

It can be found from Table 5 that with the increase of heat setting temperature, the breaking strength of nylon 6 filaments added with nano-montmorillonite is significantly higher than that of nylon 6 filaments without nano-montmorillonite, indicating that nano-montmorillonite Soil can effectively improve the breaking strength of nylon 6 molecular fibers under high temperature conditions; under the same draw ratio and heat setting temperature, the breaking strength of nylon 6 filaments increases first and then decreases with the increase of nano-montmorillonite content, indicating that adding a small amount Nano montmorillonite increases the crystallization rate of nylon 6 and increases the fiber strength. However, when the nano-montmorillonite content is greater than 2%, the crystallization rate is delayed and the crystallinity is reduced due to agglomeration and high content of nano-montmorillonite restricting the movement capacity of nylon 6 molecular chains, resulting in a decrease in strength.

The above is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technologies fields, are all included in the scope of patent protection of the present invention in the same way.

Claims (10)

1. A preparation device for nylon 6 filament with high strength and low boiling water shrinkage, comprising raw material storage tank, batching machine, screw extruder, static mixer and spinning machine, the discharge end of raw material storage tank and batching machine are all Connected to the feed end of the screw extruder, the discharge end of the screw extruder is connected with the feed end of the static mixer through a pipeline connection, and the discharge end of the static mixer is connected by a pipeline It is connected with the feeding end of the spinning machine, and it is characterized in that: on the discharging end of the spinning machine, primary fibers are drawn outwards, and the drawn primary fibers pass through the first oiler, guide wire hook, The second oiler and pre-netting device are then passed into the drawing assembly, which is used for high-strength drawing of the inserted primary fiber. 2. the preparation device of a kind of high strength low boiling water shrinkage polyamide fiber 6 filament according to claim 1, is characterized in that: described drawing assembly comprises the first pair of drawing roller group, the second pair of drawing roller group , the third pair of stretching rollers, the fourth pair of stretching rollers, the fifth pair of stretching rollers and the main network device, the nascent fiber passed through the first pair of stretching rollers, the second The second pair of stretching rollers, the third pair of stretching rollers, the fourth pair of stretching rollers, the fifth pair of stretching rollers and the main network device are passed into the winding machine. 3. the preparation device of a kind of high strength low boiling water shrinkage nylon 6 filament according to claim 1, it is characterized in that: the one side position of the lead-out section of described as-spun fiber is provided with side blowing chamber, and side blowing chamber is provided with On the side of the primary fiber leading-out section between the spinning machine and the first oiler. 4. A preparation method for high-strength low-boiling water shrinkage nylon 6 filament, characterized in that it comprises a preparation device using a high-strength low boiling water shrinkage nylon 6 filament as described in any one of claims 1 to 3 , also includes the following steps: Nylon 6 slices, nano-montmorillonite powder and dispersant powder are sequentially subjected to quantitative feeding, melt plasticization, screw shearing, water cooling pelletizing, vibration screening and vacuum drying. A 400-800-mesh filter is added to the head of the shearing machine to control the overall melting temperature of the head to 1.3-1.5MPa, and a modified nylon 6 masterbatch with a relative viscosity of 2.4-2.5 and a water content of ≤500ppm is prepared; Nylon 6 slices and the modified nylon 6 masterbatch are added to a screw extruder from a raw material storage tank and a batching machine according to a certain proportion to perform high-temperature melting and mixing to form a molten material; The screw extruder transports the molten material to the static mixer through the connecting pipeline for further mixing, and the uniformly mixed molten material is then transported to the spinning machine through the connecting pipeline, and the spinning machine carries out the melting process on the molten material. After spinning, a thin stream of melt is sprayed from the discharge end; The melt fine stream is cooled and solidified into tow through the side blowing chamber, and the tow is the as-spun fiber, and the as-spun fiber enters the first oiler for preliminary oiling, then introduces the guide wire hook, and then enters the second oiling Deep oiling of the filter, and then into the pre-networker for even distribution of oil; After oiling, the primary fiber enters the first pair of stretching rollers, the second pair of stretching rollers, the third pair of stretching rollers, the fourth pair of stretching rollers, and the fifth pair of stretching rollers for multi-stage After drawing and heat setting, it finally enters the winding machine through the main network device for winding. The tow wound in the winding machine is nylon 6 filament with high strength and low boiling water shrinkage. 5. the preparation method of a kind of low boiling water shrinkage nylon 6 filament according to claim 4, is characterized in that, described nylon 6 section selects 57～94 parts, described nano-montmorillonite selects 5～40 parts, The dispersant powder is 1-3 parts. 6. A method for preparing nylon 6 filaments with low boiling water shrinkage according to claim 4, characterized in that: the nylon 6 slices are selected from nylon 6 slices with a relative viscosity of 2.45 to 2.55 and a moisture content of ≤500ppm, The ratio of nylon 6 slices and modified nylon 6 masterbatch is 99:1-80:20, and the dispersant powder is polyurethane, low relative molecular weight copolyamide, and single-type hyperdispersant powder

One or more of 330 etc. 7. the preparation method of a kind of low boiling water shrinkage nylon 6 filament according to claim 4, is characterized in that: when described nylon 6 slice, nanometer montmorillonite powder and dispersant powder carry out melt plasticization, be in double It is carried out in a screw extruder. The twin-screw extruder is divided into eleven temperature zones and a head temperature zone. The first temperature zone is 220～245℃, the fourth, fifth and sixth temperature zones are 215～240℃, the seventh temperature zone is 200～215℃, the eighth temperature zone is 200～215℃, the ninth temperature zone is 195～205℃ ℃, the temperature zone of the tenth section is 190-205℃, the temperature zone of the eleventh section is 180-190℃, and the temperature zone of the machine head is 250-260℃. 8 . A method for preparing nylon 6 filaments with high strength and low boiling water shrinkage according to claim 4 , characterized in that, the high-temperature melting temperature of the screw extruder is 240-270° C. 9. A method for preparing nylon 6 filaments with high strength and low boiling water shrinkage according to claim 4, characterized in that, the side blowing temperature of the side blowing chamber is 20-24°C, and the wind speed is 0.35-0.5m /s, both the first oiler and the second oiler use JT-014 type oil, the oil concentration is between 25% and 40%, and the amount of oil is kept between 1.0% and 1.6%. 10. A method for preparing nylon 6 filaments with high strength and low boiling water shrinkage according to claim 4, wherein the temperature of the first pair of stretching rollers is 50-60° C., and the temperature of the second pair of stretching rollers is The temperature of the roller group is 160-170°C, the draft ratio is 3.0-4.0, the temperature of the third pair of stretching rollers is 170-200°C, the draft ratio is 1.2-1.3, and the temperature of the fourth pair of stretching rollers is 175- 220°C, the draft ratio is 1..1-1.2, the temperature of the fifth pair of stretching rollers is 170-200°C, and the fourth-stage draft ratio is 0.9-1.0.

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