KR20240076116A - Method for preparing polyurethanurea elastic yarn with improved heat resistance and elasticity recovery - Google Patents

Abstract

The present invention relates to a method for producing polyurethane-urea elastic yarn consisting of a polyol and diisocyanate polymer, using polyol and diisocyanate to prepare a prepolymer with a capping ratio (CR) of 1.30 to 1.65, and trimethylolpropane to polyurethane-urea yarn. It relates to a method for manufacturing polyurethane urea elastic yarn, which is characterized in that it is added in an amount of 0.2% to 5.0% by weight relative to the weight. According to the present invention, polyurethane with improved heat resistance and resilience while maintaining elastic properties (elongation). It relates to urea elastic yarn and its manufacturing method.

Description

Polyurethane urea elastic yarn with excellent heat resistance and recovery and its manufacturing method {METHOD FOR PREPARING POLYURETHANUREA ELASTIC YARN WITH IMPROVED HEAT RESISTANCE AND ELASTICITY RECOVERY}

The present invention relates to a polyurethane-urea elastic yarn with excellent heat resistance and resilience and a method for manufacturing the same. More specifically, it relates to a polyurethane-urea yarn with improved heat resistance and resilience and without a decrease in elongation problem by improving problems when adding trimethylolpropane. It relates to elastic yarn and its manufacturing method.

Because polyurethane urea elastic yarn has excellent elastic properties, it is widely used in various products that require elasticity and fit, such as innerwear, stockings, sportswear, compression wear, and diapers.

Polyurethane-urea elastic yarn is generally made by reacting polyol with an excess of diisocyanate compound to obtain a prepolymer having isocyanate groups at both ends of the polyol, adding a chain extender to the solution in which the obtained prepolymer is dissolved, and reacting with a chain stopper. After making the polyurethane-urea spinning solution through the following steps, it is manufactured by dry and wet spinning.

In general, when polyurethane-urea elastic yarn is used in general clothing, it is interwoven with other materials such as nylon, polyester, cotton, silk, and wool, and then goes through manufacturing processes such as cutting, sewing, and finishing to be commercialized. In the case of cross-knitting with other materials like this, thermal embrittlement occurs due to high heat in the post-processing performed after knitting with the partner yarn (nylon, cotton, silk, wool, etc.), which reduces the power and recovery of the fabric. It causes problems. In addition, polyurethane-urea elastic yarn has poor heat resistance, so when mixed with other materials, it is difficult to dye at a high temperature of about 130℃, so although it is used for various purposes, its uses are limited.

In order to solve this problem, in Korean Patent Publication No. 2014-0094357, the present applicant added trimethylolpropane to polyurethane-urea polymer to increase resilience to physical deformation compared to existing yarn by connecting molecular chains by cross-linking to create poly. A method for manufacturing polyurethane-urea elastic yarn has been proposed, which involves producing a urethane-urea spinning solution and then spinning it.

However, in this technology, when trimethylolpropane is added during the first and second polymerization of polyurethane-urea elastic yarn or after the second polymerization, the solubility in the solvent is reduced due to cross-linking between polymer chains, and the polymer is aged during the maturation process. There is a problem in that it is difficult to control the process due to the high rate of increase in viscosity of the polymer. At this time, it is possible to adjust the viscosity increase rate of the polymer by lowering the solids of the polymer, but there is a problem in that energy consumption during dry or wet spinning is large as the solids of the polymer are lowered.

In addition, polyurethane-urea elastic yarn using trimethylolpropane has the advantage of improving the power and resilience of the yarn due to cross-linking of trimethylolpropane in terms of physical properties, but the elongation is lowered, making it difficult to express the unique characteristics of polyurethane-urea elastic yarn. There is a difficult problem.

The present invention is to overcome the problems of the prior art described above, and one object of the present invention is to solve the problems when applying trimethylolpropane to polyurethane urea elastic yarn, thereby improving the unique properties of polyurethane urethane urea elastic yarn. To provide a method for manufacturing polyurethane-urea elastic yarn that has excellent heat resistance and elastic recovery while maintaining the same physical properties.

Another object of the present invention is to provide a polyurethane urethane elastic yarn that has excellent heat resistance and elastic recovery while securing elongation.

Another object of the present invention is to provide a fabric containing polyurethane-urea elastic yarn.

The present invention provides a method for manufacturing polyurethane-urea elastic yarn, which solves the problem of applying trimethylolpropane as an additive to polyurethane-urea polymer and improves yarn heat resistance and resilience by applying it normally to polyurethane-urea elastic yarn. It's about.

That is, the present invention relates to a method for producing polyurethane-urea elastic yarn composed of a polyol and diisocyanate polymer, wherein a prepolymer having a capping ratio (CR) of 1.30 to 1.65 is prepared using polyol and diisocyanate, and trimethylolpropane is added to polyurethane. It relates to a method for manufacturing polyurethane-urea elastic yarn, characterized in that urea is added in an amount of 0.2% to 5.0% by weight based on the weight of the yarn.

The method of the present invention includes a primary polymerization step of mixing polyol and diisocyanate at a capping ratio (CR) of 1.30 to 1.65 to form a prepolymer;

Adding a solvent to the obtained prepolymer and then contacting it with one or more chain extenders to perform secondary polymerization to obtain a polyurethane-urea spinning solution, and

Comprising the step of spinning a polyurethane-urea spinning solution to form a polyurethane-urea elastic yarn,

The method applies trimethylolpropane in the first polymerization step, the second polymerization step, or after the second polymerization step.

In the present invention, the amount of trimethylolpropane added is such that the viscosity increase rate is within 100%. The amount of trimethylolpropane added is such that the ratio of hard segments:soft segments is in the range of 4:96 to 10:90 based on weight.

Non-limiting examples of diisocyanates usable in the present invention include 4,4'-diphenylmethane diisocyanate, 1,5'-naphthalene diisocyanate, 1,4'-phenylene diisocyanate, hexamethylene diisocyanate, 1, It includes at least one member selected from the group consisting of 4'-cyclohexane diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, or isophorone diisocyanate.

Polyols usable in the present invention include polytetramethylene ether glycol, polypropylene glycol, polyethylene glycol, polycarbonate diol, a copolymer of a mixture of alkylene oxide and lactone monomer and poly(tetramethylene ether) glycol, or 3-methyl- One or more types selected from the group consisting of tetrahydrofuran and copolymers of tetrahydrofuran may be used.

The chain extender is ethylenediamine, 1,2-diaminopropane, 1,3-diaminopropane, 1,4-diaminobutane, 2,3-diaminobutane, 1,5-diaminopentane, 1, At least one selected from the group consisting of 6-hexamethylenediamine and 1,4-cyclohexanediamine, and the chain stopper is selected from the group consisting of diethylamine, monoethanolamine, cyclohexylamine, and dimethylamine.

The organic solvent used in preparing the polymer solution may be N,N'-dimethyl formamide, N.N'-dimethyl acetamide, or dimethyl sulfoxide.

In the present invention, in addition to the polyurethane-urea spinning solution, other additives selected from matting agents, ultraviolet stabilizers, antioxidants, NOx gas anti-yellowing agents, anti-adhesion agents, dyeing enhancers, and chlorine resistant agents can be added for spinning.

Another aspect of the present invention relates to a polyurethane-urea elastic yarn produced by the method of the present invention, characterized in that it contains trimethylolpropane in an amount of 0.2 to 5.0% by weight based on the weight of the polyurethane-urea yarn.

The polyurethane elastic yarn of the present invention has a yarn elongation of 450% or more, heat resistance of 60% or more, and elastic recovery rate of 26% or less.

The polyurethane-urea elastic yarn of the present invention is a chain extender containing (a) poly(tetramethylene ether) glycol, (b) 4,4-methylenediphenyl diisocyanate, and (c) ethylene diamine and diethylamine. It is composed of a polyurethane-urea reaction product of the mixture, and may contain 0.2 to 5.0% by weight of trimethylolpropane based on the weight of the polyurethane-urea yarn.

Another aspect of the invention relates to a fabric comprising the polyurethaneurea elastic yarn of the invention.

The polyurethane-urea elastic yarn according to the present invention improves the problems caused by the addition of trimethylolpropane, making it possible to provide a polyurethane-urea elastic yarn and a manufacturing method thereof that can improve heat resistance and resilience while maintaining the inherent stretching properties (elongation). It becomes.

Since the polyurethane-urea elastic yarn of the present invention has heat resistance sufficient to support sufficient elastic performance, there are few restrictions on thermal conditions for processing, and it can be combined with all counterpart yarns commonly used in textile products in which polyurethane-urea elastic yarn is used. products can be provided.

Hereinafter, the present invention will be described in more detail.

One aspect of the present invention is a method for producing a polyurethane-urea elastic yarn composed of a polyol and diisocyanate polymer, wherein a prepolymer having a capping ratio (CR) of 1.30 to 1.65 is prepared using polyol and diisocyanate, and trimethylolpropane is used. It relates to a method for producing polyurethane-urea elastic yarn, characterized in that it is added in an amount of 0.2% to 5.0% by weight based on the weight of the polyurethane-urea yarn.

The method of the present invention specifically includes a primary polymerization step of mixing polyol and diisocyanate at a capping ratio (CR) of 1.30 to 1.65 to form a prepolymer; Adding a solvent to the obtained prepolymer, contacting it with one or more chain extenders to perform secondary polymerization to obtain a polyurethane-urea spinning solution, and spinning the polyurethane-urea spinning solution to form a polyurethane-urea elastic yarn. It includes, and in the method of the present invention, trimethylolpropane may be added after the first polymerization step, the second polymerization step, or the second polymerization step.

In the first polymerization step, polyol is reacted with an excess of diisocyanate to form an isocyanate-terminated polyurethane or polyurethaneurea prepolymer.

In the secondary polymerization step, the prepolymer is diluted in a solvent and the chain is extended with a short-chain diol or diamine to grow the polymer chain length. At this time, the type of solvent that can be used is not particularly limited, for example, N,N'-dimethyl formamide, N.N'-dimethyl acetamide, or dimethyl sulfoxide, N-methylpyrrolidinone (NMP) or these. Mixed solvents can be used.

Chain terminators can be used to control the molecular weight of the polymer. In conventional processes of this type, soft segments are formed during the prepolymer formation step and hard segments are formed during the chain extension step.

Next, polyurethane-urea elastic yarn is manufactured from the resulting polyurethane-urea spinning solution using dry spinning, wet spinning, or melt spinning technology. In one non-limiting embodiment, the polyurethaneurea elastic yarn is produced by dry spinning.

The molecular weight of the extended polyol and the capping ratio in preparing the prepolymer must be controlled to provide the desired molecular weight ratio of soft to hard segments. In the present invention, a prepolymer is prepared from polyol and diisocyanate at a capping ratio (CR) of 1.30 to 1.65. If the capping ratio is less than 1.30, the viscosity does not increase after polymerization due to the high soft segment content, making process application difficult. If the capping ratio exceeds 1.65, it is difficult to apply the polymerization process due to excessive crosslinking, and the elongation of the yarn is low, which prevents the characteristics of spantex from being expressed.

Trimethylolpropane has three hydroxy (-OH) functional groups, and the hydroxy functional group combines with the isocyanate group (-NCO group) of the spandex polymer to form a cross-linked structure, improving the heat resistance and recovery of polyurethane urea elastic yarn. It plays a role in improving elasticity (elastic recovery rate).

When the capping ratio (CR) of the existing polyol and diisocyanate is around 1.7, it is difficult to apply a trimethylolpropane content of more than 3.0% by weight. However, when the capping ratio is adjusted within the range of 1.30 to 1.65, the trimethylolpropane content is difficult to apply. The content can be applied up to 5.0% by weight. When the capping ratio is 1.7, it is difficult to apply more than 3% of TMP considering the increase in viscosity aging rate and decrease in elongation, but when the capping ratio is lowered to 1.30~1.65, the viscosity aging rate decreases and elongation increases, resulting in TMP application. Since there is room for increase in viscosity elongation rate and decrease in elongation, the TMP content can be applied up to 5%.

In the present invention, the appropriate amount of trimethylolpropane added is about 0.2 to 5.0% by weight based on the total solids. If the content of trimethylolpropane is less than 0.2% by weight relative to the yarn weight, the effect of improving elastic recovery rate and heat resistance is minimal. Conversely, if the content of trimethylolpropane exceeds 5% by weight, there is a problem in proceeding with the normal polymerization reaction.

When adding trimethylolpropane, the viscosity increase rate after addition is ensured to be within 100%.

The addition of trimethylolpropane is preferably such that the ratio of hard segments to soft segments is in the range of 4:96 to 10:90 based on weight.

The polyol includes polytetramethylene ether glycol, polypropylene glycol, polyethylene glycol, polycarbonate diol, a copolymer of a mixture of alkylene oxide and lactone monomer and poly(tetramethylene ether) glycol, or 3-methyl-tetrahydrofuran. One or more types selected from the group consisting of copolymers of and tetrahydrofuran may be used. As the polyol, polytetramethylene ether glycol is preferred because of its good stretching properties (elastic recovery rate and elongation) and economic efficiency. These polyols may be used alone or two or more types may be used together.

In the present invention, the molecular weight of the polyol is preferably 1000 to 8000, more preferably 1800 to 6000, in terms of number average molecular weight, in order to achieve the desired level of elongation, strength, heat resistance, etc. when used as elastic yarn. By using a polymer diol with a molecular weight in this range, elastic yarn excellent in elongation, strength, elastic recovery, and heat resistance can be obtained.

The diisocyanate usable in the present invention is not particularly limited, but examples include 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, 1,5'-naphthalene diisocyanate, 1,4' -One member selected from the group consisting of phenylene diisocyanate, hexamethylene diisocyanate, 1,4'-cyclohexane diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate, and mixtures thereof You can use the above.

In the present invention, diamines can be used as chain extenders, examples of which include ethylenediamine, 1,2-diaminopropane, 1,3-diaminopropane, 1,4-diaminobutane, and 2,3-diamino. One or more selected from the group consisting of butane, 1,5-diaminopentane, 1,6-hexamethylenediamine, 1,4-cyclohexanediamine, and combinations thereof may be mentioned, but are not necessarily limited to these. .

As chain terminators, amines having a monofunctional group, such as diethylamine, monoethanol amine, cyclohexylamine, dimethylamine, etc., may be used. In preparing the polyurethane-urea of the present invention, the chain extender and chain stopper may be added all at once or in two or more steps. The chain extender and chain stopper are preferably dissolved in a suitable solvent.

In addition, in the present invention, in order to prevent discoloration and deterioration of physical properties of polyurethane urea due to ultraviolet rays, atmospheric smog, and heat treatment process accompanying polyurethane urea elastic yarn processing, a sterically hindered phenolic compound, a benzofuran-based compound, and a sterically hindered phenol-based compound are added to the spinning solution. Semicarbazide-based compounds, benzotriazole-based compounds, polymeric tertiary amine stabilizers, etc. can be added in appropriate combination.

Polyurethaneurea elastic yarns may contain additives such as stabilizers and pigments, but these additives should not diminish the benefits of the invention. These additives include benzotriazole-based stabilizers, ultraviolet absorbers, other lightfasters, antioxidants, matting agents, anti-adhesion agents, dyes and dye enhancers, lubricants (e.g., mineral oil and silicone oil), deodorizers, and antistatic agents. there is. Other examples of additives include Methacrol ^® 2462 (EI du Pont de Nemours and Company), bis(4-isocyanatocyclohexyl)methane and 3-t-butyl3-aza-1,5-pentanediol. polymers), titanium oxide, zinc oxide, magnesium stearate, barium sulfate, hydrotalcite, mixtures of huntite and hydromagnesite, and disinfectants containing silver, zinc or their compounds. There are no particular restrictions on the method of adding these other additives, and all conventional methods such as proper mixing can be used.

In addition, the molecular weight of the polyurethane constituting the polyurethane-urea elastic yarn of the present invention is preferably in the range of 40,000 to 150,000 as a number average molecular weight from the viewpoint of obtaining fibers with high durability and strength. In addition, the molecular weight is measured by GPC and converted to polystyrene.

The resulting polyurethane-urea spinning solution is then dry-spun to obtain polyurethane-urea elastic yarn having the following characteristics: elongation of 450% or more, heat resistance of 60% or more, and elastic recovery rate of 26% or less. In the present invention, elongation was measured according to the general method of ASTM D2731-72, using a MEL [Automatic Tensile Tester for Elastic Yarns STATIA MEL, Textechno] device.

An important physical property of the polyurethane-urea elastic yarn produced by the present invention is the "elastic recovery rate" (percent set), which is the degree of the fiber's ability to return to its original length after being stretched. Any excess length is expressed as a degree of elastic recovery, and these values are preferably small. The permanent strain of the polyurethane-urea elastic yarn of the present invention is 26% or less.

The polyurethane-urea elastic yarn of the present invention can be combined with other fiber materials to obtain fabrics such as letters and fabrics. These may be clothing products such as girdles, bras, underwear, tights, pantyhose, bodysuits, swimwear, sportswear, outerwear, stretch lining, etc., for example. The fiber material used in the fabric using the polyurethane-urea elastic yarn of the present invention is not particularly limited, and examples include polyamide fibers such as nylon 6 and nylon 66, polyester fibers such as polyethylene terephthalate and polytrimethylene terephthalate, and copper. Examples include natural fibers such as ammonia-regenerated rayon, viscose rayon, acetate rayon, cotton, silk, wool, and hemp.

The present invention will be described in more detail using examples. The following examples are for illustrative purposes of the present invention and are not intended to limit the scope of protection of the present invention.

Example

Example 1

PTMG and 4,4'-methylenediphenyl diisocyanate were mixed at a capping ratio (CR) of 1.50, ethylenediamine was used as a chain extender, and diethylamine was used as a chain stopper. The ratio of chain extender and chain stopper was 10:1, and dimethylacetamide was used as a solvent. That is, 468.6 g of 4,4'-methylenediphenyl diisocyanate and 1926.0 g of polytetramethylene ether glycol (molecular weight 1800) were reacted with stirring at 90°C for 150 minutes in a nitrogen gas stream to produce polyurethane urea with isocyanate at both ends. was manufactured.

After cooling the prepolymer to room temperature, 3350.7 g of dimethylacetamide was added to obtain a polyurethane-urea prepolymer solution. Next, 33.6 g (0.56 mol) of ethylenediamine and 5.1 g of diethylamine were dissolved in 651 g of dimethylacetamide and added to the prepolymer solution at 10°C or lower to obtain a polyurethane-urea solution.

Additives compared to the solid content of this polymer include 0.2% by weight of trimethylolpropane (TMP), 0.5% by weight of 5,7-di-t-butyl-3-(3,4-dimethylphenyl)-3H-benzofuran-2-one, 1,1,1',1'-tetramethyl-4,4'-(methylene-di-p-phenylene)disemicarbazide 1% by weight, poly(N,N-diethyl-2-aminoethyl meta) 1% by weight of crylate) and 0.1% by weight of titanium dioxide were added and mixed to obtain a polyurethane-urea spinning solution.

The spinning solution obtained as above was dry-spun at a speed of 900 m/min (spinning temperature: 260°C) to prepare polyurethane-urea elastic yarn of 40 denier 3 filament, and its physical properties were evaluated and shown in Table 1.

Examples 2 to 6

The same procedure as in Example 1 was carried out, except that the addition amount of trimethylolpropane (TMP) and the capping ratio (molar ratio of diisocyanate to polyol) compared to the solid content of the final polyurethane-urea polymer were changed as shown in Table 1 below. Polyurethane-urea elastic yarn was manufactured, its physical properties were evaluated, and they are shown in Table 1.

Comparative Example 1

Polyurethane-urea elastic yarn was prepared in the same manner as in Example 1 except that trimethylolpropane (TMP) was not added, and its physical properties were evaluated and shown in Table 1.

Comparative Example 2-6

The same procedure as in Example 1 was carried out, except that the addition amount of trimethylolpropane (TMP) and the capping ratio (molar ratio of diisocyanate to polyol) compared to the solid content of the final polyurethane-urea polymer were changed as shown in Table 1 below. Polyurethane-urea elastic yarn was manufactured, its physical properties were evaluated, and they are shown in Table 1.

Test example

In the examples, the physical properties of the polyurethane-urea elastic yarn were measured as follows.

* The believer's faith

Using an automatic elongation measurement device (MEL device, Textechno), measure the elongation value at break with a sample length of 10 cm and a tensile speed of 100 cm/min.

*Yarn power (5th unload at 200%)

Using an automatic tensile strength measurement device (MEL device, Textechno), the sample was repeatedly stretched 300% 5 times with a length of 10cmХ20 and a tensile speed of 100 cm/min, and the power at 200% during the 5 recovery cycles was measured.

*Immediate recovery rate of yarn

Using an automatic tensile strength measurement device (MEL device, Textechon), the ratio (%) of the deformed length compared to the initial length was measured after repeating 300% 5 times with a sample length of 10cmХ20 strands and a tensile speed of 100 cm/min.

*Heat resistance of yarn

After repeating stretching between 0 and 300% 5 times using an automatic strength measuring device, the stress at 200% during the 5th recovery (P1) and the stress at 200% during the 5th recovery after heat treatment (P2) were measured. The heat resistance of the yarn was measured and evaluated according to the formula below. For the heat treatment of the yarn, the yarn was stretched to 100% while exposed to the air and treated with dry heat at 190°C for 1 minute, then cooled to room temperature, then wet-heat treated at 100°C for 30 minutes in a relaxed state and then dried at room temperature.

Heat resistance (%) = P2/P1

division capping fee
(CR) TMP content [% by weight] Elastic recovery rate
[%] heat resistance
[%] believer
[%] Power (5th unload)
[g] Example 1 1.50 0.2 26 60 487 1.42 Example 2 1.50 1.5 22 64 482 1.46 Example 3 1.50 3.0 19 68 477 1.48 Example 4 1.50 5.0 15 71 469 1.50 Example 5 1.30 1.5 20 60 484 1.46 Example 6 1.65 1.5 25 67 475 1.48 Comparative Example 1 1.70 0.0 28 60 481 1.40 Comparative Example 2 1.70 1.5 25 63 418 1.43 Comparative Example 3 1.50 0.1 26 57 491 1.40 Comparative Example 4 1.50 5.1 Process not applicable Comparative Example 5 1.66 1.5 24 63 437 1.44 Comparative Example 6 1.29 1.5 Process not applicable

As confirmed through the results in Table 1 above, when applying trimethylolpropane to the polyurethane-urea polymer, the capping ratio is adjusted to the range of 1.30 to 1.65 and the elastic recovery rate is maintained without problems in process application by applying trimethylolpropane. This excellent and good elongation is secured, and heat resistance is improved, so that thermal embrittlement can be improved during post-processing of woven fabrics using the elastic yarn of the present invention.

Claims (13)

In the method for producing polyurethane-urea elastic yarn consisting of a polyol and diisocyanate polymer, a prepolymer having a capping ratio (CR) of 1.30 to 1.65 is prepared using polyol and diisocyanate, and trimethylolpropane is added at an amount of 0.2 relative to the weight of polyurethane-urea yarn. A method for producing polyurethane-urea elastic yarn, characterized in that it is added in an amount of % to 5.0% by weight.
The method of claim 1, wherein the method
A first polymerization step of mixing polyol and diisocyanate at a capping ratio (CR) of 1.30 to 1.65 to form a prepolymer;
Adding a solvent to the obtained prepolymer and then contacting it with one or more chain extenders to perform secondary polymerization to obtain a polyurethane-urea spinning solution, and
Comprising the step of spinning a polyurethane-urea spinning solution to form a polyurethane-urea elastic yarn,
The method is a method of producing polyurethane-urea elastic yarn, characterized in that trimethylolpropane is added after the first polymerization step, the second polymerization step, or the second polymerization step.
The method of claim 1, wherein trimethylolpropane is added so that the rate of increase in viscosity after addition is within 100%.
The polyurethane-urea elastic yarn according to claim 1, wherein the trimethylolpropane is added so that the ratio of hard segments:soft segments ranges from 4:96 to 10:90 based on weight. Manufacturing method.
The method of claim 1, wherein the diisocyanate is 4,4'-diphenylmethane diisocyanate, 1,5'-naphthalene diisocyanate, 1,4'-phenylene diisocyanate, 2,4'-diphenylmethane diisocyanate, A polyurethane urea characterized by using at least one member selected from the group consisting of hexamethylene diisocyanate, 1,4'-cyclohexane diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, or isophorone diisocyanate. Manufacturing method of elastic yarn.
The method of claim 1, wherein the polyol is polytetramethylene ether glycol, polypropylene glycol, polyethylene glycol, polycarbonate diol, a copolymer of a mixture of alkylene oxide and lactone monomer and poly(tetramethylene ether) glycol, and 3-methyl - A method for producing polyurethane-urea elastic yarn, characterized in that at least one selected from the group consisting of tetrahydrofuran and copolymers of tetrahydrofuran.
The method of claim 1, wherein the chain extender is ethylenediamine, 1,2-diaminopropane, 1,3-diaminopropane, 1,4-diaminobutane, 2,3-diaminobutane, 1,5- A method for producing polyurethane urea elastic yarn, characterized in that it is at least one selected from the group consisting of diaminopentane, 1,6-hexamethylenediamine, and 1,4-cyclohexanediamine.
The method of claim 1, wherein the chain stopper is selected from the group consisting of diethylamine, monoethanolamine, cyclohexylamine, and dimethylamine, and the organic solvent used in preparing the polymer solution is N,N'-dimethyl formamide. , N.N'-dimethyl acetamide, or dimethyl sulfoxide. A method for producing polyurethane urea elastic yarn, characterized in that.
The method of claim 1, wherein in addition to the spinning solution, one or more additives selected from a matting agent, an ultraviolet stabilizer, an antioxidant, a NOx gas anti-yellowing agent, an anti-adhesion agent, a dyeing enhancer, and a chlorine resistant agent are added to the spinning solution for spinning. Method for manufacturing polyurethane-urea elastic yarn.
A polyurethane-urea elastic yarn manufactured by the method of any one of claims 1 to 9, characterized in that it contains trimethylolpropane in an amount of 0.2 to 5.0% by weight based on the weight of the polyurethane-urea yarn.
The polyurethane-urea elastic yarn according to claim 10, wherein the polyurethane elastic yarn has an elongation of 450% or more, heat resistance of 60% or more, and an elastic recovery rate of 26% or less.
The method of claim 10, wherein the polyurethane urea elastic yarn
(a) poly(tetramethylene ether) glycol,
(b) 4,4-methylenediphenyldiisocyanate, and
(c) A polyurethane-urea elastic yarn composed of a polyurethane-urea reaction product of a mixture of a chain extender containing ethylene diamine and diethylamine, and containing 0.2 to 5.0% by weight of trimethylolpropane based on the weight of the polyurethane-urea yarn. A fabric comprising the polyurethane urea elastic yarn of claim 10.