KR20170057837A - spandex fiber with excellent unwinding property and no scum, and method for preparing the same - Google Patents

Abstract

The present invention relates to a spandex fiber with excellent unwinding properties and no scum generation, and a method for preparing the same. More specifically, by producing spandex through applying polyethylene glycol into a polyurethane urea solution, which is a spinning solution, an uneven ballooning phenomenon or a tension spike phenomenon when untwisting the spandex can be effective reduced, and spandex without untwisting properties and the generation of scum can be produced without affecting other matter properties such as adhesive properties with hot melt.

Description

TECHNICAL FIELD The present invention relates to a spandex fiber having excellent marine property and scum, and a method for manufacturing the spandex fiber.

The present invention relates to a spandex having no improvement in unwinding property and scum, and a method for producing the spandex. More specifically, the present invention relates to a spandex having a number average molecular weight of more than 3,000 to less than 11,000 It is possible to efficiently improve the ballooning phenomenon and the tension spike phenomenon at the time of spandex marginalization by injecting the glycol into the spandex and also to improve the properties such as the adhesion with the hot melt To a spandex having no marginal effect and without scum occurrence, which can improve the scum problem which may occur in rollers and guides during the diaper manufacturing process, and a method of manufacturing the same .

Spandex maintains a high degree of rubber elasticity, and is excellent in physical properties such as tensile stress and recoverability, and is therefore widely used for underwear, socks, sportswear, and the like.

Such spandex has been applied to functional fibers as it has been used for a long time, and has been used for special applications such as infants and elderly people's diapers, and medical fibers.

Conventional medical spandex fibers have a higher yarn adhesion between fiber yarn and fiber yarn than ordinary medical filament yarns and thus have poor maritime properties. Therefore, there are many filament yarns and static electricity in the post-processing such as covering, There is a disadvantage in that the tensile force is uneven.

Therefore, in order to solve such a problem, it is general to add an anti-sticking agent into the polymer to improve its properties.

However, additives such as an inorganic (Mg-st or Ca-st, Zn-st) compound, which is generally used as a conventional anti-sticking agent, are dispersed without being dissolved in a polymer solution and the substance is uniformly distributed on the surface of a yarn And it has a problem in the marine characteristics of spandex when applied to the diaper manufacturing application.

In order to solve the problem of marginality of such spandex, conventionally KR 2011-0128884 A proposes an elastic fiber comprising polyurethane or polyurethane urea and about 0.5 wt% to 25 wt% of a soluble anti-adhesion composition . Here, a cellulose-based (CAB) is used as an anti-sticking agent.

JP 2001-509847 A discloses a spandex having a low viscosity and a method of producing the spandex, and it has been proposed to use an amide system such as ethylene bis-oleylamide / stearylamide containing nitrogen as an anti-sticking agent, and CN 001291079 In C, antimicrobial substances such as zirconium phosphate, glass, and zeolite are used as an anti-sticking agent for spontex.

However, although the conventional anti-sticking agent for spandex prevents the stickiness of the textile yarn to some extent, it is difficult to prevent irregular ballooning and tension in the maraging process of the spandex yarn during the manufacturing process of the diaper, Tension spike phenomenon is not improving properly. Even in the case of an organic antistatic agent, the above problems are still not solved due to the problem of yarn run-off, deterioration of adhesion with hot melt, and compatibility with spandex polymer.

In addition, KR 2016-0080822 A, which was filed by the present applicant, did not affect the adhesion properties and physical properties with hot melt when polyethylene glycol having a molecular weight of 100 to 3,000 was used for improving marine property, , Polyethylene glycol having a molecular weight of 100 to 3,000 exists in an unstable form in which liquid and solid such as semi-solid, cream or soft wax coexist at room temperature and is in an unstable form due to deterioration in the attraction force between polyethylene glycol molecules. There is a problem that the scum appears.

KR 2011-0128884 A JP 2001-509847 A CN 001291079 C KR 2016-0080822 A

In order to solve the problems of the prior art as described above, it is an object of the present invention to provide a novel anti-sticking agent which can efficiently improve irregular floating phenomenon and tension spike phenomenon occurring in the spandex marine process, The present invention is to provide a spandex in which scum is not generated in rollers and guides in the process and a method for producing the spandex.

In order to achieve the object of the present invention, there is provided a spandex according to the present invention, wherein the spandex has improved marine properties and does not cause scum formation, and comprises a polyethylene glycol polymer represented by the following formula (1).

[Chemical Formula 1]

The number average molecular weight of the polyethylene glycol polymer of Formula 1 is within the range of more than 3,000 to 11,000.

The method for producing spandex according to the present invention is a method for producing a spandex which comprises preparing a polyurethane prepolymer solution, a polyurethane solution and a polyurethane urea spinning solution, wherein the polyurethane urea room Characterized in that the use liquid contains a polyethylene glycol polymer represented by the following formula (1) in the form of a slurry as an anti-sticking agent.

 [Chemical Formula 1]

The number average molecular weight of the polyethylene glycol polymer of Formula 1 is within the range of more than 3,000 to 11,000.

In the present invention, a polyethylene glycol polymer having a number-average molecular weight of more than 3,000 and less than 11,000 as a slurry in a spandex fiber spinning stock solution is added as an anti-sticking agent, and conventionally an inorganic anti-sticking agent (Mg-st, Ca-st, It is possible to efficiently improve the irregularity of the inflation and the tension spike during sponge yarn mar- keting in the diaper manufacturing process, which is caused by the diaper manufacturing process, and does not adversely affect the adhesive property with the hot melt, which is necessary for diaper production.

In addition, there is a problem that polyethylene glycol having a number average molecular weight of more than 3,000 to 11,000 is applied and is present in an unstable form in which a solid such as a semi-solid, cream or soft wax coexists at room temperature and polyethylene glycol intermolecular force It is possible to manufacture a spandex having an improved marine property by eliminating the problem of scum appearing on rollers or guides in the diaper manufacturing process due to deterioration.

1 is a view showing a facility for producing a sample for evaluation of creepability in Experimental Example 1 according to the present invention.
2 is an evaluation reference graph showing the OETO marine evaluation in Experimental Example 3 according to the present invention.
FIG. 3 is a photograph showing the structure of an OETO marine apparatus and the location of occurrence of scum in Experimental Example 4 according to the present invention.
4 (a) and 4 (b) are photographs showing the occurrence of scum in the OETO marine apparatus in Experimental Example 4 according to the present invention.
5 (a) and 5 (b) are photographs showing no occurrence of scum in the OETO marine apparatus in Experimental Example 4 according to the present invention.

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

The spandex without improvement of marine property and scum generation of the present invention includes a polyethylene glycol polymer represented by the following formula (1) as an anti-sticking agent.

[Chemical Formula 1]

The polyethylene glycol polymer of Formula 1 preferably has a number average molecular weight of more than 3,000 to 11,000.

The polyethyleneglycol polymer is preferably contained in an amount of 0.1 to 20% by weight based on the solid content of the polyurethaneurea solution.

Hereinafter, embodiments of a method of manufacturing a spandex without improvement in marine property and scum generation according to the present invention will be described in detail.

The method for producing spandex according to the present invention is a method for producing a spandex comprising preparing a polyurethane prepolymer solution, a polyurethane solution, and a polyurethane-urea spinning solution, wherein the poly A polyethylene glycol polymer represented by the following formula (1) is used as an anti-sticking agent in a urethane urea solution.

[Chemical Formula 1]

The number average molecular weight of the polyethylene glycol polymer of Formula 1 is within the range of more than 3,000 to 11,000.

According to a preferred embodiment of the present invention, a polyethylene glycol polymer having a number average molecular weight of more than 3,000 and less than 11,000 represented by the above formula (1) is added in a slurry state to a polyurethaneurea solution used as a spinning solution at the time of spandex production, Irregular floating phenomenon and tension spike phenomenon do not occur.

If the polyethylene glycol polymer has a number average molecular weight of 3,000 or less, it is present in an unstable form in which a solid such as a semi-solid, cream or soft wax coexists at room temperature, resulting in degradation of attraction between polyethylene glycol molecules, There is a problem in that scum appears on the rollers or guides in the manufacturing process. When the number average molecular weight exceeds 11,000, the problem of not uniformly dissolving in the slurry preparation solvent is caused due to the increase of the marine tension and unevenness of OETO marine property, .

The polyethylene glycol polymer is preferably added in a slurry state in the spinning solution. This is because when the polyurethane prepolymer solution is polymerized to obtain a polyurethane solution, the polymeric material changes in its basic physical properties, And is added to the undiluted solution in the form of a slurry so as to exhibit only the anti-sticking property.

At this time, the slurry state is preferably prepared in a solution state dissolved in DMAc.

According to a preferred embodiment of the present invention, the polyethylene glycol polymer used as the anti-sticking agent may be added in an amount of 0.1 to 20% by weight based on the solid content of the polyurethane-urea spinning solution.

When the amount is less than 0.1% by weight, the effect of preventing the adhesion between the films can not be expected due to the increase of the marine tension. If the amount exceeds 20% by weight, there is a problem in adhesion with hotmelt.

The present invention is a spandex having the new marine characteristics manufactured as described above, and thus is very suitable for application as medical or hygine spandex.

When the spandex is manufactured by the method according to the present invention, not only the adhesive property is excellent but also the marine tension is uniform, thereby preventing irregular flying phenomenon, improving the tension spike phenomenon and preventing the occurrence of scum.

Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited by the following examples.

Example

Example 1

601.1 g of diphenylmethane-4,4'-diisocyanate and 2664.5 g of polytetramethylene ether glycol (molecular weight 1,800) were reacted with stirring at 90 DEG C for 95 minutes in a nitrogen gas stream to obtain a polyurethane prepolymer having isocyanate .

After the prepolymer was cooled to room temperature, 4,811 g of dimethylacetamide was added and dissolved to obtain a polyurethane prepolymer solution.

Next, 43.3 g of ethylenediamine, 13.4 g of 1,2-propyldiamine and 5.7 g of diethylamine were dissolved in 829 g of dimethylacetamide and 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 as an antioxidant as an additive to the solid content of the polymer, % Was added to obtain a spinning solution. A spinning stock solution was prepared by using 2 wt% of polyethylene glycol (number average molecular weight: 4,000) as an anti-sticking agent in the form of a slurry in the spinning solution.

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

Example 2

A spandex fiber was prepared in the same manner as in Example 1, except that 5 wt% of polyethylene glycol polymer (number average molecular weight: 4,000) as an anti-sticking agent was added to the spinning solution.

Example 3

A spandex fiber was prepared in the same manner as in Example 1, except that 10 weight% of a polyethylene glycol polymer (number average molecular weight: 4,000) as an anti-sticking agent was added to the spinning solution.

Example 4

A spandex fiber was prepared in the same manner as in Example 1, except that 20 weight% of a polyethylene glycol polymer (number average molecular weight: 4,000) as an anti-sticking agent was added to the spinning solution.

Example 5

A spandex fiber was prepared in the same manner as in Example 1, except that 2 weight% of a polyethylene glycol polymer (number average molecular weight: 3,500) as an anti-sticking agent was added to the spinning solution.

Example 6

A spandex fiber was prepared in the same manner as in Example 1, except that polyethylene glycol polymer (number average molecular weight: 10,000) as an anti-sticking agent was added in an amount of 2% by weight to the spinning solution.

Comparative Example

Comparative Example 1

A spandex fiber was prepared in the same manner as in Example 1, except that 25 weight% of a polyethylene glycol polymer (number average molecular weight: 4,000) as an anti-sticking agent was added to the spinning solution

Comparative Example 2

A spandex fiber was prepared in the same manner as in Example 1, except that polyethylene glycol polymer (number average molecular weight 2,500) as an anti-sticking agent was added in an amount of 2% by weight to the spinning solution.

Comparative Example 3

A spandex fiber was prepared in the same manner as in Example 1 except that polyethylene glycol polymer (number average molecular weight 2,800) as an anti-sticking agent was added in an amount of 2% by weight to the spinning solution

Comparative Example 4

A spandex fiber was prepared in the same manner as in Example 1, except that 2 weight% of polyethylene glycol polymer (number average molecular weight: 12,000) as an anti-sticking agent was added to the spinning solution

Comparative Example 5

A spandex fiber was prepared in the same manner as in Example 1 except that 1 weight% of magnesium stearate was added instead of 2 weight% of a polyethylene glycol polymer (number average molecular weight: 4,000) as an anti-sticking agent in the spinning solution.

Comparative Example 6

A spandex fiber was prepared in the same manner as in Example 1, except that 0.5% by weight of the silicone emulsion in the spinning stock solution was added without adding the anti-sticking additive in the spinning stock solution.

Comparative Example 7

A spandex fiber was prepared in the same manner as in Example 1 except that the silicone emulsion was applied in an amount of 0.5% by weight based on the solids content of the yarn without adding the anti-sticking additive in the spinning stock solution.

Comparative Example 8

A spandex fiber was prepared in the same manner as in Example 1 except that no anti-sticking agent was added into the spinning stock solution.

Experimental Example

Experimental Example 1

In order to comparatively evaluate the physical properties of the spandex fibers prepared in the above Examples and Comparative Examples, creep resistance evaluation was performed as follows.

For this purpose, laminates were prepared using nonwoven fabrics and spandex fibers.

At this time, a manufacturing facility is a pilot coater of Nordson Corporation, and the method is as follows. (See Fig. 1)

(1) Nonwoven fabrics 1 and 2 are fed, and spandex yarn is fed in the middle.

(2) The elongation at the time of supplying the spandex yarn was set to 250%, the hot melt adhesive of Henkel was supplied by a spiral spray method, and a nip roller And adhere to the nonwoven fabric. At this time, the amount of glue is 60 mg / m.

(3) The production rate of the sample shall be 100 m / min.

The creepability evaluation is carried out by the following procedure using the manufactured laminate as the evaluation method of Japan U company.

(1) The laminate part is stretched to a maximum and fixed on a plastic plate of 30 cm in width and 50 cm in length.

(2) Mark the left and right 100 mm (total 200 mm) parts on the center with the oil pen.

(3) Cut the marked part with a sharp knife and measure the length of spandex missing. The creep resistance (%) as the adhesion property was calculated by the following equation (1).

The adhesion of the spandex fibers prepared in Examples 1 to 6 and Comparative Examples 1 to 8 was evaluated as described above and is shown in Table 1 below.

Example Comparative Example Item One 2 3 4 5 6 One 2 3 4 5 6 7 8 adhesion
characteristic(%) 78.5 76.1 75.9 74.9 78.3 80.5 63.4 70.1 69.8 80.9 77.3 56.3 54.3 81.5

The results of Table 1 are obtained using the pilot coater of FIG. 1 and may be slightly different from the results of the diaper manufacturing process.

In the case of the pilot coater, the speed was slower than that of the actual diaper manufacturing process, and the bonding method was also evaluated using a spiral spraying method among various methods of the diaper manufacturing process.

Referring to Table 1, when a polyethylene glycol polymer having a number average molecular weight of 4,000 was added in an amount of 2 to 20 wt% (Examples 1 to 4) and a polyethylene glycol polymer having a number average molecular weight of 3,500 and 10,000 in an amount of 2 wt% (Examples 5 to 6), excellent adhesion properties are obtained in comparison with Comparative Example 1 in which the polyethylene glycol polymer content is 25 wt%, and Comparative Examples 6 and 7 in which the silicone oil is applied without applying the anti-sticking agent .

However, when the silicone emulsion was not applied as in Comparative Example 8, there was no difference in creep, and when the polyethylene glycol having a molecular weight of 2,500 or 2,800 was added (Comparative Examples 2 and 3) I could.

Experimental Example 2

The spandex fibers prepared in Examples and Comparative Examples were evaluated as follows in order to confirm the degree of uniformity of marine characteristics in addition to the adhesive strength.

In the evaluation method of marine characteristics, a guide for fixing the yarn at a position spaced 30 cm from the fixed bobbin holder is installed, and a sensor capable of measuring the tension and a winding device capable of controlling the speed are installed and evaluated.

The tension measuring apparatus used in this evaluation apparatus is measured using an electronic tension meter manufactured by ROTHSCHILD. The values of Max, Min, Ave., and Dev. Were measured and the results are shown in Table 2 below.

In this evaluation result, the difference between the maximum value and the minimum value and the average value are kept low, and the lower the deviation value, the better the uniformity of the marine characteristics.

Example Comparative Example Item One 2 3 4 5 6 One 2 3 4 5 6 7 8 Max. (G) 2.58 2.14 2.31 2.09 2.44 2.69 0.69 2.89 2.29 4.45 8.15 2.34 2.89 60.88 Min. (G) 0.31 0.22 0.33 0.20 0.39 0.41 0.02 0.25 0.22 1.73 0.47 0.25 0.34 10.54 Ave. (G) 0.71 0.64 0.72 0.62 0.76 0.69 0.12 0.70 0.72 2.73 1.07 0.69 0.73 29.25 Dev. (G) 0.56 0.41 0.52 0.40 0.46 0.49 0.02 0.45 0.42 1.67 0.94 0.44 0.47 8.19

Referring to the above Table 2, it can be seen that when a polyethylene glycol polymer having a molecular weight of 4,000 is charged (Examples 1 to 4) and a polyethylene glycol polymer having a molecular weight of 3,500 and 10,000 is charged (Examples 5 and 6) (Comparative Examples 6 and 7) in which the silicone emulsion was applied to the spinning stock solution or applied to the yarn without injecting the anti-sticking agent of the present invention.

Compared with the use of an anti-sticking agent (Comparative Example 5), the maximum value was low.

In addition, it was found that the marine tension value was superior to that in the case where no additives were added (Comparative Example 8).

However, when the polyethylene glycol polymer having a molecular weight of 4,000 was added in an amount of 25 wt% (Comparative Example 1), the marine tension was so low that the adhesive strength between the yarns was too low.

Experimental Example 3

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

The OETO maritime evaluation was conducted in the following manner.

When the spandex fiber winding body is subjected to the OETO method, the following three types of marine shapes are generated depending on the magnitude of the force between the centrifugal force acting on the yarn and the adhesion force 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 <Adhesive strength between yarn and yarn:

In this maritime evaluation, reference numerals in FIG. 2 indicate the following states.

Reference numeral 1 denotes a fixed guide: the yarn is rotated by the OETO system and moves while moving straight from this point.

Reference numeral 2 denotes a yarn delimiting point of the winding body: a point where the yarn is tensioned and is firstly deflected from the winding body.

Reference numeral 3 denotes an angle formed between the line connecting the fixed guide and the center of the winding body and the yarn being married when the marine shape is ideal.

Reference numeral 4 denotes an angle corresponding to 1/2 of reference numeral 3 outside the ideal marine angle.

Reference numeral 5 denotes a type 1 marine shape: an ideal marine state in which the yarn is linearly angled along the angle of reference numeral 3.

Reference numeral 6 denotes a type of second-grade marine shape: a shape in which a yarn follows a trajectory formed by an angle of reference numeral 3, but a slight tremble occurs.

Reference numeral 7 denotes a state of a third grade marginal shape: the yarn is deviated from the trajectory of reference numeral 3, resulting in weaker blunting. However, the trajectory of reference numeral 4 does not deviate and is not likely to be connected to the yarn.

Reference numeral 8 denotes a 4th grade marginal shape: the state of the ballooning of the yarn becomes larger so that the trajectory of reference numeral 4 is deviated and the possibility of connecting to the thread trimming is high depending on the surrounding situation.

The results of the above OETO marine evaluation are shown in Table 3 below.

division Example Comparative Example One 2 3 4 5 6 One 2 3 4 5 6 7 8 Maritime
Rating 1-2
Rating 1-2
Rating 1-2
Rating 1-2
Rating 1-2
Rating 1-2
Rating 3 to 4
Rating 2 to 3
Rating 2 to 3
Rating 3 to 4
Rating 3 to 4
Rating 1-2
Rating 1-2
Rating Non-maritime

From the results of Table 3, it was confirmed that the example according to the present invention exhibits excellent marine characteristics as compared with Comparative Examples (1 to 5, 8). However, it was judged that there was no problem in the OETO marine characteristics when 0.5 wt% of the silicone emulsion in the spinning stock solution of Comparative Examples 6 and 7 or 0.5 wt% of the solid content of the yarn was applied.

Experimental Example 4

The spandex fibers produced according to the above Examples and Comparative Examples were evaluated for scum generation by using over-end-take-off (OETO) marine equipment.

The OETO marine system consists of tension control roller and sensor unit of BTSR and frame, roller, and guide unit manufactured by Hyosung Corporation.

Scum occurrence evaluation using this facility was carried out by the following method.

The spandex fiber winding body is subjected to the marine operation using the OETO method, and the occurrence of scum on the surface of the tension control roller and the first and second guides is evaluated.

In FIG. 2, reference numeral 1 denotes a roller for controlling supply tension of the spandex yarn during OETO maritime, reference numeral 2 denotes a first guide to be firstly passed through, and reference numeral 3 denotes a second guide to pass secondly.

The marine speed was 250 m / min, the marine time was 6 hours, and the tension was 40 g. The scum occurrence evaluation results are shown in Table 4.

In Table 4, (1) is the tension control roller surface, (2) is the primary guide, (3) is the secondary guide, and when scum is generated (X).

How to distinguish scum occurrence phenomenon

(○): When the yield of the scum generated on the roller and the guide is 0.01 g or more as shown in FIG. 4, the value is recorded and marked with ○.

(X): When the yield of the scum generated on the roller and the guide is 0.01 g or less as shown in Fig.

division Example Comparative Example One 2 3 4 5 6 One 2 3 4 5 6 7 8 (One) X X X X X X O
(0.34 g) O
(0.45 g) O
(0.29 g) X X X X X (2) X X X X X X O
(0.32 g) O
(0.41 g) O
(0.22 g) X X X X X (3) X X X X X X O
(0.28 g) O
(0.39 g) O
(0.24 g) X X X X X

From the results of Table 4, it was confirmed that scum was not generated in Comparative Example 1 and 2 to 3 in the case of the present invention. It can be confirmed from the results of Experimental Examples 1 and 2 that the creep properties, the sea tensions, the OETO marine characteristics, and the occurrence of scum are improved.

Claims (6)

A spandex characterized by comprising a polyethylene glycol polymer represented by the following formula (1) and having no marginal improvement or scum occurrence.
[Chemical Formula 1]

The number average molecular weight of the polyethylene glycol polymer of Formula 1 is within the range of more than 3,000 to 11,000. The method according to claim 1,
Wherein the polyethylene glycol polymer is contained in an amount of 0.1 to 20% by weight based on the solids weight of the polyurethane-urea spinning solution. The method according to claim 1,
Wherein the spandex is hygine or medical grade spandex. A method for producing a spandex comprising preparing a polyurethane prepolymer solution, a polyurethane solution, and a polyurethane-urea spinning solution,
A process for producing spandex wherein the polyurethane urea spinning solution contains a polyethylene glycol polymer represented by the following general formula (1) as an anti-sticking agent in the form of slurry.
[Chemical Formula 1]

The number average molecular weight of the polyethylene glycol polymer of Formula 1 is within the range of more than 3,000 to 11,000. 5. The method of claim 4,
Wherein the polyethylene glycol polymer is contained in an amount of 0.1 to 20% by weight based on the solids weight of the polyurethane-urea spinning solution, and wherein the polyethylene glycol polymer is improved in marine property and scum-free. 5. The method of claim 4,
Wherein the slurry is prepared in the form of a solution dissolved in dimethylacetamide (DMAc) and used for improvement of marine property and no generation of scum.

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