KR102160834B1 - A process for preparing spandex fiber with exellent unwinding property - Google Patents

Abstract

The present invention relates to a method of manufacturing spandex with improved maritime properties, and more particularly, by adding polyethylene glycol to a polyurethaneurea solution, which is a spinning solution, to prepare spandex, an irregular ballooning phenomenon during maritime of spandex. And a method of manufacturing a spandex having improved maritime properties while not being able to efficiently improve tension spikes and the like, but also without negative effects on other physical properties such as adhesion properties with hot melts.

Description

Manufacturing method of spandex with improved maritime properties {A process for preparing spandex fiber with exellent unwinding property}

The present invention relates to a method of manufacturing spandex with improved maritime properties, and more particularly, by adding polyethylene glycol to a polyurethaneurea solution, which is a spinning solution, to prepare spandex, an irregular ballooning phenomenon during maritime of spandex. And a method of manufacturing a spandex having improved maritime properties while not being able to efficiently improve tension spikes and the like, but also without negative effects on other physical properties such as adhesion properties with hot melts.

Since spandex maintains a high degree of elasticity and has excellent physical properties such as tensile stress and recovery, it is widely used in underwear, socks, and sports clothing. As the use of such spandex is further expanded, it is now also applied as a functional fiber, and is used for special uses such as diapers or medical fibers.

Conventional medical spandex fibers have higher inter-thread adhesion between fiber yarns and fiber yarns than general medical fibers, and therefore have poor maritime properties.There are many trimmings in post-processing processes such as covering, setting and knitting, and static electricity is generated. There is a disadvantage that the tension of the is uneven.

Therefore, in order to improve this problem, it is common to add an anti-sticking agent into the polymer to improve its properties.

However, conventionally used anti-adhesive agents are generally inorganic (Mg-st or Ca-st, Zn-st), but these additives are not dissolved in the polymer solution but are dispersed, so that the substance is 絲(Company). There is a problem in that it is not evenly distributed on the surface, so when it is applied for diaper manufacturing purposes, it caused a problem in the maritime properties of spandex.

In order to solve such problems as the seamability of spandex, KR 2011-0128884 A has conventionally proposed an elastic fiber comprising a polyurethane or polyurethaneurea and a soluble anti-sticking composition of about 0.5% to 25% by weight. . Here, cellulose-based (CAB) is used as an anti-sticking agent.

In addition, JP 2001-509877 A relates to a low-viscosity spandex and its manufacturing method, and it is proposed to use an amide system such as ethylene bis-oleylamide/stearamide containing nitrogen as an anti-sticking agent, CN 001291079 In B, antimicrobial substances such as zirconium phosphate, glass, and zeolite are used as anti-sticking agents for spantex.

However, the anti-adhesive agent applied to the existing spandex manufacturing prevented the adhesion between the fibers to some extent, but due to the addition of inorganic substances of the anti-adhesive agent, an irregular ballooning phenomenon occurred during the maritime process of the spandex yarn during the diaper manufacturing process. And tension spikes have not been properly improved. In addition, even with organic anti-adhesive agents, the above problems are still not solved due to flow-down phenomenon, poor adhesion to hot melt, and compatibility problems with spandex polymer.

KR 2011-0128884 A JP 2001-509877 A CN 001291079 B

In order to solve the problems of the prior art as described above, the present invention efficiently improves the irregular ballooning phenomenon and tension spike phenomenon that appear in the maritime process of the spandex, and solves the improvement of the maritime performance of the spandex without problems with other physical properties. To

Accordingly, an object of the present invention is to provide a method for manufacturing a spandex with improved maritime properties without irregular ballooning and tension spikes during maritime.

In addition, another object of the present invention is to provide a method of manufacturing a spandex excellent in seamability by using a new anti-sticking agent in the spandex manufacturing process.

In order to solve the problems of the present invention as described above, the present invention is a polyethylene glycol compound selected from a polyethylene glycol polymer represented by the following formula (1) or a derivative thereof in a polyurethaneurea spinning solution in preparing spandex using a polyurethaneurea spinning stock solution It provides a method of manufacturing a spandex, characterized in that the phosphorus anti-sticking agent is added in the form of a slurry.

[Formula 1]

The polyethylene glycol compound of Formula 1 has a molecular weight of 100 to 3000.

In the case of producing spandex according to the present invention, by adding a polyethylene glycol compound in the form of a slurry in the spandex fiber spinning stock solution, the conventional inorganic anti-adhesion agent (Mg-st, Ca-st, Zn-st) is introduced. Among the diaper manufacturing processes that have occurred, it is possible to efficiently improve the irregular ballooning and tension spikes during the sea of spandex yarns, as well as not adversely affect the adhesion properties with hot melts essential for diaper manufacturing. There is an effect of manufacturing a spandex having improved maritime properties compared to.

1 is an evaluation criterion graph showing OETO maritime evaluation in Experimental Example 3 according to the present invention.

Hereinafter, the present invention will be described in more detail as one implementation example.

The present invention relates to a new manufacturing method of spandex in which a polyethylene glycol compound is added in a slurry state to a polyurethaneurea solution, which is a spinning dope, in a manufacturing method of spandex.

According to a preferred embodiment of the present invention, irregular ballooning in the maritime process by adding a polyethylene glycol monomer represented by Formula 1 or a polyethylene glycol polymer or a derivative thereof to a polyurethaneurea solution used as a spinning dope in the manufacture of spandex as an anti-sticking agent. This is a manufacturing method of spandex that prevents problems such as phenomenon and tension spike from occurring.

According to the present invention, the polyethylene glycol compound may be used as a monomer or a polymer or a derivative thereof as an anti-sticking agent. According to a preferred embodiment of the present invention, the polyethylene glycol polymer may preferably have a molecular weight of 100 to 3000. If the molecular weight is too large, there is a problem that it does not dissolve uniformly in the solvent when preparing the slurry, and if the molecular weight is too small, there is a problem in the anti-adhesion function because it exists as a hard solidified material.

According to a preferred embodiment of the present invention, the polyethylene glycol compound used as an anti-sticking agent may be added in an amount of 0.1 to 20% by weight based on the weight of the solid content of the polyurethaneurea solution. When it is added to 0.1% or less, it is not possible to expect an effect of preventing interstitial adhesion due to an increase in the maritime tension, and if it is 20% by weight or more, there is a problem in adhesion to the hot melt, which is not preferable.

According to a preferred embodiment of the present invention, the polyethylene glycol is added in the form of a slurry in the spinning dope. The reason is that when it is added to polymerization, it causes changes in basic physical properties of the polymer. will be. At this time, it is recommended to prepare and use the slurry as a solution in DMAc.

The present invention is a spandex having novel maritime properties prepared as described above, and is very suitable for application as a medical spandex. Accordingly, the present invention includes a spandex having excellent maritime properties prepared according to the present invention, and particularly includes a spandex for hygine or medical use.

When spandex is manufactured by the method according to the present invention, not only has excellent adhesive properties, but also has uniform maritime tension, thereby preventing ballooning and improving tension spikes.

Hereinafter, the present invention will be described in detail based on examples, but the present invention is not limited by the following examples.

Example 1

Polyurethane prepolymer having isocyanate at both ends by reacting 601.1 g of diphenylmethane-4,4`-diisocyanate and 2664.5 g of polytetramethylene ether glycol (molecular weight 1800) while stirring at 90°C for 95 minutes in a nitrogen gas stream Was prepared

After cooling the prepolymer to room temperature, 4811 g of dimethylacetamide was added and dissolved to obtain a polyurethane prepolymer solution.

Next, 43.3 g of ethylenediamine and 13.4 g of 1,2-propyldiamine, and 5.7 g of diethylamine were dissolved in 829 g of dimethylacetamide, and then added to the prepolymer solution at 9° C. or lower to obtain a polyurethane solution. 1% by weight of triethylene glycol-bis-3-(3-tertiary-butyl-4-hydroxy-5-methylphenyl) propionate, an antioxidant as an additive to the solid content of this polymer, and 1% of titanium dioxide as a lightfastener Was added to obtain a spinning dope. A spinning dope was prepared using 1% of polyethylene glycol (molecular weight 1000) as an anti-sticking agent in the form of a slurry in the spinning dope.

In the dry spinning process, the spinning temperature was set to 260℃ or higher, and the winding speed was wound at 500m/min.

Example 2

A spandex fiber was prepared in the same manner as in Example 1, except that 2% of a polyethylene glycol polymer (molecular weight 1000), which is an anti-sticking agent, was added to the spinning dope.

Comparative Example 1

A spandex fiber was prepared in the same manner as in Example 1, except that 0.5% of magnesium stearate was added instead of the polyethylene glycol polymer (molecular weight 1000), which is an anti-sticking agent in the spinning stock solution.

Comparative Example 2

A spandex fiber was prepared in the same manner as in Example 1, except that an anti-sticking agent was not added to the spinning stock solution, or 0.5% or 0.5% of a silicone emulsion was added to the spinning stock solution, or 0.5% of the solid content of the yarn was applied.

Comparative Example 3

A spandex fiber was prepared in the same manner as in Example 1, except that 1% by weight of a polyethylene glycol polymer (molecular weight 4000), which is an anti-adhesive agent, was added to the spinning dope, and the molecular weight was 4,000.

Comparative Example 4

A spandex fiber was prepared in the same manner as in Example 1, except that an anti-sticking agent was not added to the spinning stock solution.

Experimental Example 1

In order to compare and evaluate the physical properties of the spandex fibers prepared in Examples and Comparative Examples, the creep property evaluation, which is an adhesive property, was performed in the following manner.

To this end, after making a diaper using spandex fiber, it was evaluated as follows using the sample.

In the evaluation, the spandex fiber prepared above is put on a diaper, the polypropylene nonwoven fabric and the polyethylene film and the bonded portion are removed, and the evaluation is performed by the following procedure by the creep property evaluation method of Japan U company.

(1) The spandex fiber-infused adhesive part is stretched to the maximum by the length of the diaper and fixed to a plastic plate 30 cm wide and 50 cm long.

(2) Mark both left and right 100mm (total 200mm) from the center with an oil pen.

(3) Cut the marked part with a sharp knife and measure the extent of the spandex coming out with a ruler.

The adhesive property creep property (%) was calculated by the following equation (1).

[Equation 1]

Adhesive property (creep property)(%) = [200-(extended length)]/200 100

The adhesion strength of the spandex fibers prepared in Examples 1 to 6 and Comparative Examples 1 to 4 was evaluated as described above, and is shown in Table 1 below.

Example Comparative example Item One 2 One 2 3 4 Adhesive properties (%) 98.50% 97.60% 97.80% 87.50% 97.70% 99.30%

Referring to Table 1, even when a polyethylene glycol monomer or a polymer thereof is added (Examples 1 to 2), excellent adhesion properties are exhibited compared to the case of Comparative Example 2 in which a silicone emulsion was applied without adding an anti-sticking agent. Was able to confirm.

However, as in Comparative Examples 1, 3, and 4, it was possible to confirm the level of adhesion properties comparable to those in which the silicone emulsion was not applied.

Experimental Example 2

In order to confirm the degree of uniformity of maritime properties in addition to adhesive strength for the spandex fibers prepared in the above Examples and Comparative Examples, evaluation was performed as follows.

The maritime characteristics evaluation method is evaluated by installing a guide to fix the yarn at a position 30 cm apart from the fixed bobbin holder, and installing a sensor capable of measuring tension and a winding device capable of adjusting speed.

The tension measuring device used in this evaluation device is measured using an electronic tension meter manufactured by ROTHSCHILD. The maximum (Max), minimum (Min), average (Ave.), and deviation (Dev.) values were measured, and the results are shown in Table 2 below.

From this evaluation result, it can be said that the difference between the Max value and the Min value and the level of the Ave value are low, and the lower the Dev value is, the better the degree of uniformity of maritime characteristics is.

Example Comparative example One 2 One 2 3 4 Max(g) 3.58 2.74 8.15 2.89 5.56 62.52 Min(g) 0.41 0.22 0.47 0.25 0.25 9.86 Ave(g) 0.81 0.64 1.11 0.7 1.01 31.33 Dev(g) 0.56 0.41 1.35 0.45 1.47 8.58

Referring to Table 2, even when a polyethylene glycol monomer or a polymer thereof is added (Examples 1 to 2), the level of the maritime tension is not added to the anti-sticking agent of the present invention, and the silicone emulsion is added to the spinning dope or the yarn is It was possible to confirm the maritime tension similar to that of the application (Comparative Example 2). And, when compared with the case of using the inorganic anti-sticking agent (Comparative Example 1), the Max value showed a low level. In addition, it was found that it exhibited superior maritime tension values compared to the case in which no additive was added (Comparative Example 3).

Experimental Example 3

OETO (Over-end-take-off) maritime evaluation was performed on the spandex fibers prepared according to the Examples and Comparative Examples.

This OETO maritime evaluation was conducted in the following way.

When the spandex fiber wound body is maritimed by the OETO method, the following three types of maritime yarns occur according to the magnitude of the force between the centrifugal force applied to the yarn and the adhesive force formed between the yarn and the yarn.

(A) Centrifugal force> Adhesion between yarn and yarn: irregular ballooning

(B) Centrifugal force ≒ Adhesion between yarn and yarn: No irregular ballooning or extremely weak

(C) Centrifugal force <Adhesion between yarn and yarn: Inability to maritime (trim)

For such maritime evaluation, reference numerals in FIG. 1 mean the following states.

Reference number 1 denotes a fixed guide: the thread is rotated and moved by the OETO method, and then moves in a straight line from this point.

Reference number 2 denotes the dismissal point of the winding body: the point at which the thread receives tension and is first released from the winding body.

Reference number 3 denotes an angle formed by the line connecting the center of the fixed guide and the winding body and the thread to be maritime in the ideal maritime form.

Reference number 4 means an angle corresponding to 1/2 of the reference number 3 outside the ideal sea angle.

Reference number 5 denotes a first-class maritime type: in an ideal maritime state, the actual maritime line along the angle of reference number 3 is indicated.

Reference number 6 denotes a type 2 maritime form: the thread follows the trajectory formed by the angle of reference number 3, but a slight distortion occurs.

Reference number 7 denotes a 3rd class maritime form: the thread deviates from the trajectory of reference number 3, and weak ballooning is occurring, but the trajectory of reference number 4 does not deviate, indicating a state in which there is no possibility to be connected to a trimmer.

Reference number 8 denotes a level 4 maritime form: the ballooning of the yarn has become larger and deviates from the trajectory of reference number 4, and indicates a state that is likely to be connected to the emissary according to the surrounding situation.

The results of the OETO maritime evaluation as described above are shown in Table 3 below.

division Example Comparative example One 2 One 2 3 4 Maritime grade Grade 1~2 Grade 1~2 Grade 3-4 Level 3 Grade 3-4 Maritime impossible

Looking at the results of Table 3, it was confirmed that the example according to the present invention exhibits superior maritime properties compared to the comparative example. In addition, it was confirmed that the spandex produced by the manufacturing method according to the present invention has an unpredictable and remarkable effect when the results of the experiment in 1 and 2 and the result of experiment 3 are combined.

Therefore, the method of manufacturing the spandex according to the present invention shows superior maritime properties compared to the spandex manufactured by the conventional method.

Claims (4)

In preparing spandex using a polyurethane urea spinning dope, an anti-sticking agent, a polyethylene glycol compound selected from a polyethylene glycol polymer represented by the following Formula 1 or a derivative thereof, is added to the polyurethane urea spinning solution in a slurry form,
The polyethylene glycol is a method for producing a spandex excellent in seamability, characterized in that it is added in a slurry state in the spinning dope so as not to cause a change in basic physical properties of the polymer:
[Formula 1]

The polyethylene glycol polymer of Formula 1 has a molecular weight of 100 to 3000.
The method of claim 1, wherein the polyethylene glycol compound is added in an amount of 0.1 to 20% by weight based on the weight of the solid content of the polyurethaneurea solution.
Spandex, characterized in that produced by the manufacturing method of claim 1 or 2.
The spandex according to claim 3, wherein the spandex is for hygiene or medical use.

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