CN112410899B - Manufacturing process of high-strength structural polyamide 6 - Google Patents
Manufacturing process of high-strength structural polyamide 6 Download PDFInfo
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- CN112410899B CN112410899B CN202011221288.7A CN202011221288A CN112410899B CN 112410899 B CN112410899 B CN 112410899B CN 202011221288 A CN202011221288 A CN 202011221288A CN 112410899 B CN112410899 B CN 112410899B
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- 229920002292 Nylon 6 Polymers 0.000 title claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 239000000835 fiber Substances 0.000 claims abstract description 60
- 238000009987 spinning Methods 0.000 claims abstract description 44
- 208000012886 Vertigo Diseases 0.000 claims abstract description 42
- 239000002994 raw material Substances 0.000 claims abstract description 30
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000002844 melting Methods 0.000 claims abstract description 12
- 230000008018 melting Effects 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 239000000155 melt Substances 0.000 claims abstract description 9
- 235000010290 biphenyl Nutrition 0.000 claims abstract description 6
- 239000004305 biphenyl Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 238000007664 blowing Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 17
- 238000013461 design Methods 0.000 claims description 12
- 239000008041 oiling agent Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000007493 shaping process Methods 0.000 claims description 11
- 238000004804 winding Methods 0.000 claims description 11
- 239000003921 oil Substances 0.000 claims description 6
- 239000010779 crude oil Substances 0.000 claims description 5
- 229920002521 macromolecule Polymers 0.000 claims description 4
- 230000006855 networking Effects 0.000 claims description 2
- 238000009998 heat setting Methods 0.000 abstract description 2
- 238000010583 slow cooling Methods 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000000578 dry spinning Methods 0.000 description 1
- 238000002074 melt spinning Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
- D01D10/02—Heat treatment
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/096—Humidity control, or oiling, of filaments, threads or the like, leaving the spinnerettes
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/12—Stretch-spinning methods
- D01D5/16—Stretch-spinning methods using rollers, or like mechanical devices, e.g. snubbing pins
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Artificial Filaments (AREA)
Abstract
The invention discloses a manufacturing process of a high-strength structure polyamide 6 fiber, which comprises the following steps: firstly, feeding: adding a PA6 spinning raw material into a screw extruder, wherein the relative viscosity of the raw material is 2.6-3.2; II, a melting stage: after a PA6 spinning raw material enters a screw extruder, melting the raw material in a high-temperature environment of the screw extruder, and further uniformly mixing the raw material under the stirring of a screw, wherein the temperature setting range of a screw temperature zone is 255-280 ℃, and the temperature of biphenyl is 270-280 ℃; thirdly, spinning stage: after the melt which is melted and uniformly mixed by the screw enters a spinning box body, the melt is sprayed out by a spinning component and a spinneret plate to form PA6 nascent filament bundles, and the pressure of the spinning component is adjusted to 13.0-18.0 Mpa; fourthly, the nascent tows are subjected to slow cooling device and cross air blow cooling and then are bundled and oiled; fifthly, the cooled and oiled filament bundles are subjected to multi-stage drafting and heat setting and then rolled into filament coils. The invention provides a manufacturing process of high-strength structural polyamide 6 fiber with high tensile strength and good quality.
Description
Technical Field
The invention relates to the technical field of high-strength fibers, in particular to a manufacturing process of polyamide 6 with a high-strength structure.
Background
The high-strength polyamide 6(PA6) fiber mainly utilizes the techniques of melt spinning, dry spinning, zone drawing and heat setting and the like, the high-strength polyamide 6 fiber has great requirements in both military and civilian aspects, and the high-strength polyamide 6 fiber mainly refers to the fiber with the tensile breaking strength of more than 6.0 cN/dtex. According to the prior art, the tensile strength of domestic high-strength polyamide 6 fibers rarely reaches more than 10.0cN/dtex, and the coefficient of variation of the strength and the coefficient of variation of the tensile elongation both do not reach the standard requirements and are poor in quality.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: overcomes the defects of the prior art and provides a manufacturing process of high-strength structural polyamide 6 with high tensile strength and good quality.
In order to realize the purpose, the technical scheme of the invention is as follows:
the process of producing high strength polyamide 6 includes the following steps:
firstly, feeding: adding a PA6 spinning raw material into a screw extruder, wherein the relative viscosity of the raw material is 2.6-3.2; and does not extinction.
II, a melting stage: after a PA6 spinning raw material enters a screw extruder, melting the raw material in a high-temperature environment of the screw extruder, and further uniformly mixing the raw material under the stirring of a screw, wherein the temperature of a screw temperature zone is set to be 255-280 ℃, and the temperature of biphenyl is 270-280 ℃;
thirdly, spinning stage: after the melt which is melted and uniformly mixed by the screw enters a spinning box body, the melt is sprayed out by a spinning component and a spinneret plate to form PA6 nascent filament bundles, the spinning component is assembled by the newly designed and processed spinneret plate, and the pressure of the spinning component is adjusted to 13.0-18.0 Mpa;
fourthly, cooling stage: the tows sequentially pass through a slow cooler and a side blowing device, the temperature of the slow cooler is set to be 240-280 ℃, the temperature of the side blowing device is set to be 17-19 ℃, the air pressure is 500-600 Pa, and the humidity is 92-95%; the slow cooling device aims at slowing down the cooling process of the nascent tows, and the side blowing device is used for uniformly cooling the tows and facilitating bundling and oiling.
Fifthly, bundling and oiling: the tows can be collected into bundles after being fully cooled by a side blowing device, then the tows pass through an oil nozzle for oiling and a pre-networking device, the oiling agent is a crude oil type oiling agent, the concentration of the oiling agent is 50-65%, and the oiling amount of the tows is kept between 1.0-1.6%; endows the tows with good lubricity and cohesion, and reduces the friction force and dispersion of the tows.
Sixthly, stretching: stretching in 3-5 steps, wherein the stretching can be performed in a segmented manner through multiple stretching steps, and the macromolecular structures in the fibers are induced to be oriented and crystallized through setting different stretching processes and stretching step by step; thereby greatly improving the strength of the fiber.
Seventhly, heating and shaping: heat design and tensile going on simultaneously, each stretch and all will carry out suitable heat design to the fibre after the drawing after accomplishing, and the temperature setting of each draft roller is: the temperature of the first roller is normal temperature, the temperature of the two rollers is 60-100 ℃, the temperature of the three rollers is 120-180 ℃, the temperature of the four rollers is 150-200 ℃, and the temperature of the five rollers is 180-220 ℃; heating the fibre in stretching process, on the one hand can make the interior macromolecule of fibre motion aggravation, and the macromolecule of being convenient for carries out the orderly arrangement at stretching in-process to improve the orientation degree and the crystallinity of the inside macromolecule of fibre, thereby improve fibrous intensity. On the other hand, by heating and shaping, the retraction stress generated after the fiber is greatly stretched can be greatly reduced, and the fiber is convenient to form the final winding spinning cake.
Eighthly, winding and forming: after the fiber is subjected to multi-stage drafting and shaping, the mechanical properties of the fiber in all aspects are stabilized, and the fiber is rolled into a shape-regular silk roll by a winding device to form the high-strength structural PA6 fiber.
After the steps are adopted, compared with the prior art, the method has the following advantages: by utilizing a multi-pass drafting method and innovative design of spinning process parameters, the PA6 high-strength fiber with the strength of 10.0cN/dtex can be spun, can be applied to textile fabrics with very high requirements on strength in the aspects of military and civilian, and simultaneously, the tensile strength variation coefficient, the tensile elongation and the tensile elongation variation coefficient of the polyamide 6 fiber can reach standard requirements.
Preferably, the spinneret plate in the third step is provided with a plurality of first spinneret orifice groups and a plurality of second spinneret orifice groups, the first spinneret orifice group and the second spinneret orifice group are distributed at intervals, the length of the first spinneret orifice group is less than that of the second spinneret orifice group, the first spinneret orifice group comprises first spinneret orifices with centers positioned on the same straight line, the second spinneret orifice group comprises second spinneret orifices with centers positioned on the same straight line, the projections of the first spinneret holes and the projections of the second spinneret holes on the horizontal plane are distributed at intervals, the projection of the first spinneret orifice group on the horizontal plane is positioned in the projection of the second spinneret orifice group on the horizontal plane, the number of the first spinneret orifice group is one more than that of the second spinneret orifice group, and the spinneret orifices are arranged according to a specific arrangement mode, so that the residual elongation of the nascent fiber can be improved, and the post-stretching performance of the fiber is improved.
Preferably, the number of the first spinneret orifice groups is three, the number of the second spinneret orifice groups is two, the number of the first spinneret orifice groups is two, and the number of the second spinneret orifice groups is three.
Preferably, the diameter of the first spinneret orifice is equal to that of the second spinneret orifice, the diameter of the first spinneret orifice is 0.3-0.4 mm, the drawing time of the spray head is 30-100, that is, the newly sprayed filament bundle is drawn by less than 100 times when not cooled, so that the residual tensile property of the fiber is improved.
Preferably, the length-diameter ratio of the first spinneret orifice is 1.5-3.0, and the plate surface pressure is 2.0-5.0 MPa.
Preferably, the included angle A between the cross air blowing direction and the vertical line is 4-6 degrees, and the positioning grooves are oppositely arranged for two, so that the cooling uniformity of each single fiber and the protection of each spinneret orifice can be improved.
Preferably, the effect is good when four stretching steps are performed in the sixth step.
Preferably, the first-pass stretching ratio is set to be 1.1-2.0; the second stretching multiple is set to be 1.5-2.5; setting the stretching ratio of the third step to be 1.1-1.6; the fourth stretching multiple is set to be 0.9-1.2, so that the tensile strength variation coefficient, the tensile elongation and the tensile elongation variation coefficient of the polyamide 6 fiber can meet the standard requirements.
Preferably, the setting temperature after the first stretching is 60-100 ℃; setting temperature after the second stretching is 120-180 ℃; setting temperature after the third stretching is 150-200 ℃; and the setting temperature after the fourth stretching is 180-220 ℃.
Drawings
FIG. 1 is a top view of a spinneret plate for a process for manufacturing high strength structural polyamide 6 according to the present invention;
FIG. 2 is a front cross-sectional view of a spinneret orifice of a process for producing high strength structural polyamide 6 according to the present invention.
The spinneret plate comprises a spinneret plate body 1, a spinneret plate body 2, a first spinneret hole body 3, a second spinneret hole body A and an included angle.
Detailed Description
The present invention will be further described with reference to the following embodiments.
The first embodiment is as follows: the manufacturing process of the high-strength structural polyamide 6 comprises the following steps:
firstly, feeding: feeding a PA6 spinning raw material into a screw extruder, wherein the relative viscosity of the raw material is 2.65;
II, a melting stage: after a PA6 spinning raw material enters a screw extruder, melting the raw material in a high-temperature environment of the screw extruder, and further uniformly mixing the raw material under the stirring of a screw, wherein the temperature of a screw temperature zone is 255 ℃, and the temperature of biphenyl is 270 ℃;
thirdly, spinning stage: after melt which is melted and uniformly mixed by a screw enters a spinning box body, the melt is ejected by a spinning assembly and a spinneret plate 1 to form PA6 nascent filament bundles, the spinning assembly is assembled by the newly designed and processed spinneret plate 1, the pressure of the spinning assembly is adjusted to 13.0Mpa, the spinneret plate is provided with a plurality of rows of first spinneret orifice groups and a plurality of rows of second spinneret orifice groups, the first spinneret orifice groups and the second spinneret orifice groups are distributed at intervals, the length of the first spinneret orifice groups is less than that of the second spinneret orifice groups, the first spinneret orifice groups comprise first spinneret orifices 2 the centers of which are positioned on the same straight line, the second spinneret orifice groups comprise second spinneret orifices 3 the centers of which are positioned on the same straight line, the projections of the first spinneret orifices 2 on the horizontal plane and the projections of the second spinneret orifices 3 on the horizontal plane are distributed at intervals, the projections of the first orifice groups on the horizontal plane are positioned in the projections of the second spinneret groups on the horizontal plane, the number of the first spinneret orifice groups is one more than that of the second spinneret orifice groups, the diameter of the first spinneret orifice 2 is 0.3mm, the length-diameter ratio of the first spinneret orifice 2 is 1.5, and an included angle A between the lateral blowing direction and a vertical line is 4 degrees;
fourthly, cooling stage: the tows sequentially pass through a slow cooler and a side blowing device, the temperature of the slow cooler is set to be 240 ℃, the temperature of the side blowing device is set to be 17 ℃, the air pressure is 500Pa, and the humidity is 92%;
fifthly, bundling and oiling: the tows can be collected into bundles after being fully cooled by a side blowing device, then the tows pass through an oil nozzle and a pre-interlacer, the oil agent is crude oil, the concentration of the oil agent is 50 percent, and the oil mass on the tows is kept at 1.0 percent;
sixthly, stretching: the fiber is stretched in 4 steps, the stretching can be performed in a segmented mode through multiple stretching, different stretching processes are set, stretching is performed step by step, the macromolecular structure in the fiber is induced to be oriented and crystallized, and the stretching multiple of the first stretching is set to be 1.5; the second stretching ratio is set to be 2.1; the third stretching multiple is set to be 1.3; setting the fourth stretching multiple to be 0.95, and setting the temperature after the first stretching to be 60-100 ℃; setting temperature after the second stretching is 120-180 ℃; setting temperature after the third stretching is 150-200 ℃; setting temperature after the fourth stretching is 180-220 ℃;
seventhly, heating and shaping: heat design and tensile going on simultaneously, each stretch and all will carry out suitable heat design after accomplishing, to the fibre heating after the drawing, the temperature setting of each draft roller is: the temperature of the first roller is normal temperature, the temperature of the two rollers is 60 ℃, the temperature of the three rollers is 120 ℃, the temperature of the four rollers is 150 ℃ and the temperature of the five rollers is 180 ℃;
eighthly, winding and forming: after the fiber is subjected to multi-stage drafting and shaping, the mechanical properties of the fiber in all aspects are stabilized, and the fiber is rolled into a shape-regular silk roll by a winding device to form the high-strength structural PA6 fiber.
Example two: the manufacturing process of the high-strength structural polyamide 6 comprises the following steps:
firstly, feeding: feeding a PA6 spinning raw material into a screw extruder, wherein the relative viscosity of the raw material is 3.01;
II, a melting stage: after a PA6 spinning raw material enters a screw extruder, melting the raw material in a high-temperature environment of the screw extruder, and further uniformly mixing the raw material under the stirring of a screw, wherein the temperature of a screw temperature zone is set to be 260 ℃, and the temperature of biphenyl is 275 ℃;
thirdly, spinning stage: after melt which is melted and uniformly mixed by a screw enters a spinning box body, the melt is ejected by a spinning assembly and a spinneret plate to form PA6 nascent filament bundles, the spinning assembly is assembled by the newly designed and processed spinneret plate, the pressure of the spinning assembly is adjusted to 15.0Mpa, the spinneret plate is provided with a plurality of rows of first spinneret orifice groups and a plurality of rows of second spinneret orifice groups, the first spinneret orifice groups and the second spinneret orifice groups are distributed at intervals, the length of the first spinneret orifice groups is less than that of the second spinneret orifice groups, the first spinneret orifice groups comprise first spinneret orifices with centers positioned on the same straight line, the second spinneret orifice groups comprise second orifices with centers positioned on the same straight line, the projections of the first spinneret orifices on the horizontal plane and the projections of the second spinneret orifices on the horizontal plane are distributed at intervals, the projections of the first spinneret orifice groups on the horizontal plane are positioned in the projections of the second spinneret orifice groups on the horizontal plane, the number of the first spinneret orifice groups is one more than that of the second spinneret orifice groups, the diameter of each first spinneret orifice is 0.35mm, the length-diameter ratio of each first spinneret orifice is 2.5, and an included angle A between the side blowing direction and a vertical line is 5 degrees;
fourthly, cooling stage: the tows sequentially pass through a slow cooler and a side blowing device, wherein the temperature of the slow cooler is set to be 260 ℃, the temperature of side blowing is set to be 18 ℃, the air pressure is 550Pa, and the humidity is 93%;
fifthly, bundling and oiling: the tows can be collected into bundles after being fully cooled by a side blowing device, then the tows pass through an oiling nozzle and a pre-interlacer, the oiling agent is crude oil type oiling agent, the concentration of the oiling agent is 57%, and the oiling amount of the tows is kept at 1.3%;
sixthly, stretching: the fiber is stretched in 4 steps, the stretching can be performed in a segmented mode through multiple stretching, different stretching processes are set, stretching is performed step by step, the macromolecular structure in the fiber is induced to be oriented and crystallized, and the stretching multiple of the first stretching is set to be 1.6; the second stretching ratio is set to be 2.0; the third stretching multiple is set to be 1.3; setting the fourth stretching multiple to be 1.05, and setting the temperature after the first stretching to be 80 ℃; the setting temperature after the second stretching is 150 ℃; setting temperature after the third stretching is 170 ℃; setting temperature after the fourth stretching is 200 ℃;
seventhly, heating and shaping: heat design and tensile going on simultaneously, each stretch and all will carry out suitable heat design after accomplishing, to the fibre heating after the drawing, the temperature setting of each draft roller is: the temperature of the first roller is normal temperature, the temperature of the two rollers is 80 ℃, the temperature of the three rollers is 150 ℃, the temperature of the four rollers is 170 ℃ and the temperature of the five rollers is 200 ℃;
eighthly, winding and forming: after the fiber is subjected to multi-stage drafting and shaping, the mechanical properties of the fiber in all aspects are stabilized, and the fiber is rolled into a shape-regular silk roll by a winding device to form the high-strength structural PA6 fiber.
Example three: the manufacturing process of the high-strength structural polyamide 6 comprises the following steps:
firstly, feeding: feeding a PA6 spinning raw material into a screw extruder, wherein the relative viscosity of the raw material is 3.15;
II, a melting stage: after a PA6 spinning raw material enters a screw extruder, melting the raw material in a high-temperature environment of the screw extruder, and further uniformly mixing the raw material under the stirring of a screw, wherein the temperature of a screw temperature zone is set to 280 ℃, and the temperature of biphenyl is 280 ℃;
thirdly, spinning stage: after melt which is melted and uniformly mixed by a screw rod enters a spinning box body, the melt is sprayed by a spinning assembly and a spinneret plate to form PA6 nascent filament bundles, the spinning assembly is assembled by the newly designed and processed spinneret plate, the pressure of the spinning assembly is adjusted to 18.0Mpa, the spinneret plate is provided with a plurality of first spinneret orifice groups and a plurality of second spinneret orifice groups, the first spinneret orifice groups and the second spinneret orifice groups are distributed at intervals, the length of the first spinneret orifice groups is less than that of the second spinneret orifice groups, the first spinneret orifice groups comprise first spinneret orifices the centers of which are positioned on the same straight line, the second spinneret orifice groups comprise second orifices the centers of which are positioned on the same straight line, the projection of the first spinneret orifices on the horizontal plane and the projection of the second spinneret orifices on the horizontal plane are distributed at intervals, the projection of the first spinneret orifice groups on the horizontal plane is positioned in the projection of the second spinneret orifices on the horizontal plane, the number of the first spinneret orifice groups is one more than that of the second spinneret orifice groups, the diameter of the first spinneret orifice is 0.4mm, the length-diameter ratio of the first spinneret orifice is 3.0, and an included angle A between the lateral blowing direction and a vertical line is 6 degrees;
fourthly, cooling stage: the tows sequentially pass through a slow cooler and a side blowing device, wherein the temperature of the slow cooler is set to be 280 ℃, the temperature of the side blowing device is set to be 19 ℃, the air pressure is 600Pa, and the humidity is 95%;
fifthly, bundling and oiling: the tows can be collected into bundles after being fully cooled by a side blowing device, then the tows pass through an oiling nozzle and a pre-interlacer, the oiling agent is crude oil type oiling agent, the concentration of the oiling agent is 65%, and the oiling amount of the tows is kept at 1.6%;
sixthly, stretching: the fiber is stretched in 4 steps, the stretching can be performed in a segmented mode through multiple stretching, different stretching processes are set, stretching is performed step by step, the macromolecular structure in the fiber is induced to be oriented and crystallized, and the stretching multiple of the first stretching is set to be 1.4; the second stretching multiple is set to be 2.0; the third stretching multiple is set to be 1.4; setting the fourth stretching multiple to be 1.06, and setting the temperature after the first stretching to be 100 ℃; setting temperature after the second stretching is 180 ℃; setting temperature after the third stretching is 200 ℃; setting temperature after the fourth stretching is 220 ℃;
seventhly, heating and shaping: heat design and tensile going on simultaneously, each stretch and all will carry out suitable heat design after accomplishing, to the fibre heating after the drawing, the temperature setting of each draft roller is: the temperature of the first roller is normal temperature, the temperature of the two rollers is 100 ℃, the temperature of the three rollers is 180 ℃, the temperature of the four rollers is 200 ℃ and the temperature of the five rollers is 220 ℃;
eighthly, winding and forming: after the fiber is subjected to multi-stage drafting and shaping, the mechanical properties of the fiber in all aspects are stabilized, and the fiber is rolled into a shape-regular silk roll by a winding device to form the high-strength structural PA6 fiber.
The invention has the technical effects that: through the reformation of a spinning spinneret plate, the utilization of a multi-channel drafting method and the innovative design of spinning process parameters, the PA6 high-strength fiber with the strength of 10.0cN/dtex can be spun, and can be applied to textile fabrics with very high requirements on strength in the aspects of military and civilian, and simultaneously, the tensile strength variation coefficient, the tensile elongation and the tensile elongation variation coefficient of the polyamide 6 fiber can all reach the standard requirements.
The following table compares the performance tests of the high strength polyamide 6 fibers produced in examples one, two and three with those of the high strength polyamide 6 fibers produced in the prior art. The specification was 44dtex/12 f.
TABLE 1
TABLE 2
TABLE 3
TABLE 4
As can be seen from the table, the tensile strength of the high-strength polyamide 6 fiber in the prior art is close to 10.0cN/dtex, and the variation coefficient of the tensile strength and the variation coefficient of the tensile elongation do not meet the standard requirements. The high-strength polyamide 6 fiber produced by the method has the tensile strength of 10.0cN/dtex, the variation coefficient of the tensile strength, the tensile elongation and the variation coefficient of the tensile elongation all reach the standard requirements, and the quality is good.
On the basis of the above-described aspects, if various changes or modifications to the present invention are made without departing from the spirit and scope of the present invention, it is intended that the present invention also include these changes and modifications if they fall within the scope of the claims and the equivalent technical scope of the present invention.
Claims (2)
1. The manufacturing process of the high-strength structural polyamide 6 is characterized by comprising the following steps of: it comprises the following steps:
firstly, feeding: adding a PA6 spinning raw material into a screw extruder, wherein the relative viscosity of the raw material is 2.6-3.2;
II, a melting stage: after a PA6 spinning raw material enters a screw extruder, melting the raw material in a high-temperature environment of the screw extruder, and further uniformly mixing the raw material under the stirring of a screw, wherein the temperature of a screw temperature zone is set to be 255-280 ℃, and the temperature of biphenyl is 270-280 ℃;
thirdly, spinning stage: after the melt which is melted and uniformly mixed by the screw enters a spinning box body, the melt is sprayed out by a spinning component and a spinneret plate to form PA6 nascent filament bundles, and the pressure of the spinning component is adjusted to 13.0-18.0 Mpa;
fourthly, cooling stage: the tows sequentially pass through a slow cooler and a side blowing device, the temperature of the slow cooler is set to be 240-280 ℃, the temperature of the side blowing device is set to be 17-19 ℃, the air pressure is 500-600 Pa, and the humidity is 92-95%;
fifthly, bundling and oiling: the tows can be collected into bundles after being fully cooled by a side blowing device, then the tows pass through an oil nozzle for oiling and a pre-networking device, the oiling agent is a crude oil type oiling agent, the concentration of the oiling agent is 50-65%, and the oiling amount of the tows is kept between 1.0-1.6%;
sixthly, stretching: stretching in 3-5 steps, wherein the stretching can be performed in a segmented mode through multiple stretching steps, different stretching processes are set, and the macromolecule structure in the fiber is induced to be oriented and crystallized;
seventhly, heating and shaping: heat design and tensile going on simultaneously, each stretch and all will carry out suitable heat design after accomplishing, to the fibre heating after the drawing, the temperature setting of each draft roller is: the temperature of the first roller is normal temperature, the temperature of the two rollers is 60-100 ℃, the temperature of the three rollers is 120-180 ℃, the temperature of the four rollers is 150-200 ℃, and the temperature of the five rollers is 180-220 ℃;
eighthly, a winding forming stage: after the fiber is subjected to multi-stage drafting and shaping, the mechanical properties of the fiber in all aspects are stabilized, and the fiber is rolled into a shape-regular silk roll by a winding device to form the high-strength structural PA6 fiber;
the spinneret plate in the third step is provided with three rows of first spinneret orifice groups and two rows of second spinneret orifice groups, the first spinneret orifice groups and the second spinneret orifice groups are distributed at intervals, the length of the first spinneret orifice groups is smaller than that of the second spinneret orifice groups, the first spinneret orifice groups comprise first spinneret orifices, the centers of which are positioned on the same straight line, the second spinneret orifice groups comprise second spinneret orifices, the centers of which are positioned on the same straight line, the projections of the first spinneret orifices on the horizontal plane and the projections of the second spinneret orifices on the horizontal plane are distributed at intervals, the projections of the first spinneret orifice groups on the horizontal plane are positioned in the projections of the second spinneret orifice groups on the horizontal plane, the number of the first spinneret orifices is two, and the number of the second spinneret orifices is three;
stretching four times in the sixth step;
the first-pass stretching ratio is set to be 1.1-2.0; the second stretching multiple is set to be 1.5-2.5; setting the stretching ratio of the third step to be 1.1-1.6; the fourth stretching multiple is set to be 0.9-1.2;
the diameter of the first spinneret orifice is equal to that of the second spinneret orifice, and the diameter of the first spinneret orifice is 0.3-0.4 mm;
the length-diameter ratio of the first spinneret orifice is 1.5-3.0;
the included angle A between the lateral blowing direction and the vertical line is 4-6 degrees.
2. The process for manufacturing high-strength structural polyamide 6 according to claim 1, wherein: setting temperature after the first stretching is 60-100 ℃; setting temperature after the second stretching is 120-180 ℃; setting temperature after the third stretching is 150-200 ℃; and the setting temperature after the fourth stretching is 180-220 ℃.
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