Polyurethaneurea composition and method for manufacturing polyurethane urea elastic fiber using same

Abstract

The present invention relates to a polyurethane urea composition using an organic solvent that ensures excellent solubility and processability with polyurethane urea and to a method for manufacturing polyurethane urea elastic fiber. According to the present invention, by using a pyrrolidone-based solvent, the reaction can be controlled to obtain a high-molecular-weight polyurethane polymer, and the resulting polyurethane elastomer solution has excellent transparency, does not become cloudy even upon long-term storage, thereby providing good storage stability, is not subject to environmental regulations, and is highly stable during processing due to a high flash point, and is low in terms of residual amount in the elastic fiber, thereby providing the advantage of being harmless to the human body when used in clothing.

Description

Polyurethaneurea composition and method for manufacturing polyurethaneurea elastic yarn using the same

[0001] The present invention relates to a polyurethaneurea composition and a method for manufacturing a polyurethaneurea elastic yarn using the same. More specifically, the invention relates to a polyurethaneurea composition and a method for manufacturing a polyurethaneurea elastic yarn using an organic solvent that ensures excellent solubility and processability in polyurethaneurea.

[0002] Polyurethaneurea elastic fibers, also known as spandex or elastane, are widely used in stockings, sportswear, women's underwear, swimwear, and stretch fabrics due to their excellent elasticity and elastic recovery. Furthermore, polyurethaneurea elastic fibers are interwoven with polyamide, polyester, and natural fibers to serve as elastic materials in various clothing applications, including bras, socks, pantyhose, and swimwear.

[0003] Polyurethaneurea elastic yarn is generally manufactured by reacting a high molecular weight polyol with an excess amount of diisocyanate compound to obtain a prepolymer having isocyanate groups at both ends of the polyol, dissolving the prepolymer in a suitable solvent, and then dry-spinning or wet-spinning the polyurethaneurea polymer solution obtained by chain-extending the prepolymer.

[0004] Dry spinning technology involves creating a spinning solution by dissolving a polymer in an organic solvent, then extruding the solution from a spinneret through a high-temperature thermal channel to allow the solvent to volatilize and the polymer filaments to solidify, thereby manufacturing fibers. Most commercially available polyurethaneurea elastic yarns are produced using dry spinning technology. The selection of the solvent is critical in dry spinning technology. First, the solvent must possess strong polarity to completely dissolve high-molecular-weight polymers. If solubility is insufficient, the cross-section of the yarn becomes non-uniform, leading to significant variations in physical properties. Second, the polymer solution must rapidly remove the solvent as it passes through the high-temperature spinning drum to minimize the amount of residual solvent in the fiber. This is because solvents are highly toxic, and it is essential to minimize the potential harm to human health caused by residual solvent in spandex fibers both during and after production.

[0005] Currently, organic polar solvents such as N-methyl-2-pyrrolidone (NMP), dimethylformamide (DMF), and dimethylacetamide (DMAc) are used in the synthesis of polyurethaneurea polymers. These solvents are harmful to the human body due to their carcinogenic and cytotoxic properties, and they also pose environmental, toxicological, and administrative problems. For example, NMP is listed on the "Substances of Very High Concern (SVHC)" list under REACH (Registration, Evaluation, Authorization and Restriction of Chemicals), the European Union regulatory framework for the registration, evaluation, authorization, and restriction of chemicals. DMAc and DMF also have similar issues and are scheduled to be regulated under REACH. Therefore, there is a need to develop alternative solvents for manufacturing polyurethaneurea elastic fibers.

[0006] [Prior Art Literature]

[0007] [Patent Literature]

[0008] (Patent Document 1) KR 2023-0065317 A

[0009] The present invention aims to solve the problems of the aforementioned prior art. One objective of the present invention is to provide a polyurethaneurea composition that can efficiently and stably synthesize high molecular weight polyurethaneurea polymers, and which uses a solvent that can replace regulated substances such as REACH, so that the reaction solution does not become cloudy during or after the reaction, thereby having high transparency and storage stability, and a method for manufacturing a polyurethaneurea elastic yarn using the same.

[0010] One aspect of the present invention for solving the above-mentioned problem is

[0011] The present invention relates to a polyurethaneurea composition comprising a polyurethaneurea polymer and a pyrrolidone-based solvent of the following chemical formula 1.

[0012]

[0013] In the above equation, R 1 is hydrogen, an alkyl group having 1 to 4 carbon atoms, or a carboxyl group, and R 2 is hydrogen or an alkyl group having 1 to 8 carbon atoms.

[0014] Another aspect of the present invention for solving the above-mentioned problem relates to a method for manufacturing a polyurethaneurea elastic yarn comprising the steps of: dissolving a polyurethaneurea precursor in an organic solvent of Formula 1 and then performing a chain extension reaction to obtain a polyurethaneurea solution; and preparing a spinning solution from the obtained polyurethaneurea solution and spinning it.

[0015] [Chemical Formula 1]

[0016]

[0017] In the above equation, R 1 is hydrogen, an alkyl group having 1 to 4 carbon atoms, or a carboxyl group, and R 2 is hydrogen or an alkyl group having 1 to 8 carbon atoms.

[0018] In the present invention, a polyurethaneurea precursor is prepared by polymerizing a polyol and an excess amount of diisocyanate, and then the polyurethaneurea precursor is dissolved in a pyrrolidone-based solvent of Formula 1 to obtain a prepolymer solution, and then a chain extender and a chain terminater are added to the obtained prepolymer solution to synthesize a polyurethaneurea polymer and prepare a polyurethaneurea solution.

[0019] In the present invention, one or more polyols selected from the group consisting of polytetramethylene ether glycol, polypropylene glycol, polycarbonate diol, and combinations thereof may be used, but are not necessarily limited to these.

[0020] In the present invention, one or more types selected from the group consisting of 4,4'-diphenylmethane diisocyanate, 1,5'-naphthalene diisocyanate, 1,4'-phenylene diisocyanate, hexamethylene diisocyanate, 1,4'-cyclohexane diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, and isophorone diisocyanate may be used as the diisocyanate.

[0021] In the present invention, one or more diol or diamine chain extenders may be used as chain extenders.

[0022] In the present invention, one or more diamine chain extenders selected from the group consisting of ethylenediamine, 1,2-diaminopropane, 1,3-diaminopropane, 1,4-diaminobutane, 2,3-diaminobutane, 1,5-diaminopentane, 1,6-hexamethylenediamine, 1,4-cyclohexanediamine, and combinations thereof may be used.

[0023] One or more selected from the group consisting of diethylamine, monoethanolamine, cyclohexylamine, and dimethylamine may be used as the above-mentioned chain endogenizer.

[0024] In the method of the present invention, polyurethane can be synthesized by solution polymerization, and the polyurethaneurea spinning solution can be spun by dry spinning.

[0025] Another aspect of the present invention for achieving the above-described objective relates to a polyurethane-urea elastic yarn produced by the method for producing a polyurethane-urea elastic yarn described above.

[0026] The residual amount of organic solvent in the polyurethane urea elastic yarn of the present invention can be 0.1% to 0.90%.

[0027] According to the present invention, by using a pyrrolidone-based solvent as a solvent in the preparation of a polyurethaneurea elastomer, a polyurethaneurea polymer of high molecular weight and high performance can be obtained while the reaction proceeds at a controllable high speed. By using the pyrrolidone-based organic solvent of the present invention, a polyurethaneurea elastomer with excellent solubility and solution stability can be obtained under various polyurethane compositions and solution concentration conditions. Furthermore, the polyurethaneurea elastomer of the present invention has excellent transparency and does not become cloudy even after long-term storage, thus providing excellent storage stability; additionally, due to its high flash point, process stability can be ensured even under high-temperature process conditions.

[0028] According to the method for manufacturing polyurethane urea elastic yarn of the present invention, it complies with international regulations such as REACH and can reduce harmfulness to the human body.

[0029] According to the present invention, by using a solvent that complies with international regulations such as REACH, it is possible to manufacture a polyurethane-urea elastic yarn having physical properties equivalent to those of conventional polyurethane-urea elastic yarn even under milder conditions.

[0030] The present invention will be described in more detail below.

[0031] In this specification, the term "fiber" may be a single filament or multiple filaments and may be used interchangeably with "yarn."

[0032] As used herein, the term "polyurethaneurea elastic fiber" means "an elastomer fiber in which the fiber-forming material is a long-chain synthetic polymer composed of at least 85% segmented polyurethane." In this specification, the term "polyurethaneurea elastic fiber" may be used interchangeably with "spandex fiber."

[0033] In this specification, the “capping ratio (CR)” is defined as the molar ratio of diisocyanate to polyol used in the prepolymerization step. If multiple diisocyanate compounds and / or polyols are used in the reaction, the average molecular weight should be used when calculating the capping ratio.

[0034] In this specification, "solvent" means an organic solvent capable of forming a homogeneous solution of a polyurethane polymer.

[0035] In this specification, the term "polymerization" includes the term "copolymerization" in its meaning unless otherwise indicated.

[0036] The term “solution-spinning” as used herein includes the manufacture of fibers from a solution, which may be a wet-spinning or dry-spinning process.

[0037] One aspect of the present invention relates to a polyurethaneurea composition comprising a polyurethane polymer and a pyrrolidone-based solvent of the following formula 1.

[0038] [Chemical Formula 1]

[0039]

[0040] In the above equation, R 1 is hydrogen, an alkyl group having 1 to 4 carbon atoms, or a carboxyl group, and R 2 is hydrogen or an alkyl group having 1 to 8 carbon atoms. In the present invention, R 1 and R 2 It may be the same or different.

[0041] Non-limiting examples of the pyrrolidone-based solvent of Chemical Formula 1 above include 2-pyrrolidone, 1-ethyl-2-pyrrolidone, 1-butyl-2-pyrrolidone, 1-cyclohexyl-2-pyrrolidone, 1-vinyl-2-pyrrolidone, 2-pyrrolidone-5-carboxylic acid, etc.

[0042] Another aspect of the present invention relates to a method for manufacturing a polyurethaneurea elastic yarn comprising the steps of: dissolving a polyurethaneurea precursor in an organic solvent of Formula 1 and then performing a chain extension reaction to obtain a polyurethaneurea solution; and preparing a spinning solution from the obtained polyurethaneurea solution and spinning it.

[0043] [Chemical Formula 1]

[0044]

[0045] In the above equation, R 1 is hydrogen, an alkyl group, or a carboxyl group, and R 2 is hydrogen or an alkyl group.

[0046] In the present invention, a polyurethaneurea precursor is prepared by polymerizing a polyol and an excess amount of diisocyanate, and then the polyurethaneurea precursor is dissolved in a solvent of Formula 1 to obtain a prepolymer solution, and then a chain extender and a chain terminater are added to the prepolymer solution to synthesize a polyurethaneurea polymer and prepare a polyurethaneurea solution.

[0047] Polyols usable in the present invention include polyether glycol, polycarbonate glycol, and polyester glycol having a number average molecular weight of about 600 to about 3,500. A mixture of two or more polyols or copolymers may be used.

[0048] The polyols usable in the present invention may be exemplified by one selected from the group consisting of polytetramethylene ether glycol, polypropylene glycol, polycarbonate diol, and combinations thereof, but are not necessarily limited to these.

[0049] The diisocyanates used in the manufacture of the polyurethane-urea elastic yarn of the present invention are not particularly limited, but examples thereof may include one or more selected from the group consisting of 4,4'-diphenylmethane diisocyanate, 1,5'-naphthalene diisocyanate, 1,4'-phenylene diisocyanate, hexamethylene diisocyanate, 1,4'-cyclohexane diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, or isophorone diisocyanate.

[0050] In the reaction for synthesizing polyurethane from a polyol and a diisocyanate using a pyrrolidone-based solvent in the present invention, the reaction temperature is typically 20°C to 150°C, preferably 30°C to 120°C, and more preferably 40°C to 110°C.

[0051] In the present invention, the polyurethane may have a molar ratio of diisocyanate to polyol of 1.65 to 2.0 and a %NCO range of the prepolymer of 2.6 to 3.8.

[0052] When manufacturing polyurethane, a polyol is first reacted with an organic isocyanate and, optionally, a catalyst to form an "NCO-terminated prepolymer" or "capped glycol." This reaction is generally carried out in the form of a uniformly blended mixture with applied heat at a temperature of 60 to 95°C for a period of 1 to 6 hours. The amount of each reaction component can be controlled by a capping ratio (CR), defined as the molar ratio of the diisocyanate to the polyol. In the present invention, the capping ratio (CR) of the polyol and the diisocyanate is preferably 1.65 to 2.0.

[0053] After the capping reaction is completed when all hydroxyl (-OH) groups from the polyol molecule are consumed by the isocyanate (-NCO) groups from the diisocyanate to form urethane groups, the weight % (%NCO) of the NCO groups remaining on the prepolymer can be measured. In one embodiment of the present invention, the preferred %NCO range of the prepolymer may be 2.60 to 3.80.

[0054] In the present invention, one or more diol or diamine chain extenders may be used as chain extenders.

[0055] The diamine chain extenders usable in the present invention may include one or more selected from the group consisting of ethylenediamine, 1,2-diaminopropane, 1,3-diaminopropane, 1,4-diaminobutane, 2,3-diaminobutane, 1,5-diaminopentane, 1,6-hexamethylenediamine, 1,4-cyclohexanediamine, and combinations thereof, but are not necessarily limited to these.

[0056] Examples of diol chain extenders usable in the present invention include ethylene glycol, 1,3-propanediol, 1,2-propylene glycol, 3-methyl-1,5-pentanediol, 2,2-dimethyl-1,3-trimethylenediol, 2,2,4-trimethyl-1,5-pentanediol, 2-methyl-2-ethyl-1,3-propanediol, 1,4-bis(hydroxyethoxy)benzene and 1,4-butanediol and mixtures thereof, but are not necessarily limited to these.

[0057] For controlling the molecular weight of polyurethaneurea polymers, one or more chain-ending agents selected from the group consisting of amines having a single functional group, such as diethylamine, monoethanolamine, cyclohexylamine, and dimethylamine, may be used, but are not necessarily limited to these.

[0058] Polyurethane urea elastic yarns may contain additives such as stabilizers and pigments, but such additives should not impair the advantages of the present invention. Such additives include benzotriazole-based stabilizers, ultraviolet absorbers, other light-resistant agents, antioxidants, matting agents, anti-sticking agents, dyes and dye promoters, lubricants (e.g., mineral oil and silicone oil), deodorizers, and antistatic agents. Other examples of additives include polymers of bis(4-isocyanatocyclohexyl)methane and 3-t-butyl3-aza-1,5-pentanediol), titanium oxide, zinc oxide, magnesium stearate, barium sulfate, mixtures of hydrotalcite, huntite and hydromagnesite, and fungicides containing silver, zinc, or compounds thereof.

[0059] In addition, to prevent discoloration and deterioration of physical properties of the polyurethaneurea elastic yarn of the present invention due to ultraviolet rays, atmospheric smog, heat treatment processes associated with spandex processing, etc., a sterically hindered phenolic compound, a benzofuran-one compound, a semicarbazide compound, a benzotriazole compound, a polymeric tertiary amine stabilizer, etc., may be appropriately added to the spinning solution.

[0060] Furthermore, the polyurethane urea elastic yarn of the present invention may include additives such as titanium dioxide, magnesium stearate, etc. in addition to the above components.

[0061] There are no specific restrictions on the method of adding these other additives, and any conventional method, such as titration mixing, may be used. The additives may be mixed into the polymer solution at any stage after the polyurethaneurea polymer is formed and before the solution is spun into fibers. As a representative method, blending by a static mixer or a stirring method may preferably be used after adding to the spinning solution.

[0062] When forming polyurethane elastic fibers by spinning a polyurethaneurea solution obtained by a solution polymerization method, the spinning method is not particularly limited, and known methods such as dry spinning and wet spinning can be appropriately used. However, considering productivity, dry spinning is preferred in that stable spinning is possible for all finenesses from thin to thick threads.

[0063] Another aspect of the present invention relates to a polyurethane urea elastic yarn produced by the method for producing a polyurethane urea elastic yarn described above.

[0064] The residual amount of organic solvent in the polyurethane-urea elastic yarn of the present invention can be 0.1% to 0.90%.

[0065] The polyurethane urea elastic yarn of the present invention can be suitably used, for example, in clothing such as innerwear, stockings, socks, sportswear, swimwear, and fashion clothing; clothing materials such as elastic tapes and strings; vehicle interior materials such as vehicle seats; and sanitary products such as disposable diapers.

[0066] The present invention will be described in more detail below with reference to examples. However, the following examples are intended to illustrate embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Furthermore, in the examples, "parts" and "%" refer to weight standards unless otherwise specified.

[0067] Examples

[0068] Example 1

[0069] A polyurethane prepolymer was prepared by thoroughly mixing polytetramethylene glycol having a molecular weight of about 1800 and 4,4'-diphenylmethane diisocyanate at a capping ratio of 1.65 at a temperature of about 90°C for 120 minutes to obtain an NCO% of 2.46%. After cooling the prepolymer to room temperature, it was mixed with 2-pyrrolidone to prepare a polyurethane prepolymer solution containing about 45% solids.

[0070] Next, an amine solution was prepared by mixing 2-pyrrolidone with a chain extender and a chain terminater at a concentration of 7 wt%, such that the ratio of the chain extender to the chain terminater was 17:1. This was added to the prepolymer solution and reacted for 2-3 minutes to obtain a polyurethaneurea solution containing approximately 35% solids. At this time, the chain extender was used in a ratio of 80 mol% ethylenediamine and 20 mol% 1,2-diaminopropane, and diethylamine was used as the chain terminater.

[0071]

[0072] Example 2

[0073] A polyurethaneurea solution was obtained by carrying out the same procedure as in Example 1, except that the solid content of the polyurethaneurea solution was prepared at 37%.

[0074]

[0075] Example 3

[0076] 4,4'-diphenylmethane diisocyanate and polytetramethylene glycol were prepared with a capping ratio (CR) of 1.72 to achieve an NCO% of 2.70%. Ethylenediamine was used at 100 mol% as a chain extender, and diethylamine was used as a chain terminater. The ratio of the chain extender to the chain terminater was set to 8:1, the amines used were prepared at a total concentration of 7 mol%, and 2-pyrrolidone was used as a solvent to obtain a polyurethaneurea solution with a final polymer solid content of 35 wt%.

[0077]

[0078] Example 4

[0079] 4,4'-diphenylmethane diisocyanate and polytetramethylene glycol were prepared with a capping ratio (CR) of 1.85 to achieve an NCO% of 3.15%. Ethylenediamine was used at 50 mol% and 1,2-diaminopropane at 20 mol% as chain extenders, and diethylamine was used as the chain terminater.

[0080] The ratio of chain extender to chain terminater was set to 20:1, the amine used was prepared at a total concentration of 7 mol%, and 2-pyrrolidone was used as the solvent to obtain a polyurethaneurea solution with a final polymer solid content of 40 wt%.

[0081]

[0082] Comparative Examples 1 to 3

[0083] A polyurethaneurea solution was obtained by carrying out the same procedure as in Examples 1, 3, and 4, except that dimethylacetamide (DMAc) was used as the solvent.

[0084]

[0085] Comparative Example 4

[0086] A polyurethaneurea solution was obtained by carrying out the same procedure as in Example 1, except that dimethyl sulfoxide (DMSO) was used as the solvent in Example 1.

[0087]

[0088] Comparative Example 5

[0089] In Example 1, the solvent was Cyrene TM A polyurethaneurea solution was obtained by carrying out the same procedure as in Example 1, except that [the product] was used.

[0090]

[0091] Example 5

[0092] A polyurethaneurea elastic yarn spinning solution was obtained by adding and mixing 1.5 wt% of ethylenebis(oxyethylene)bis-(3-(5-t-butyl-4-hydroxy-m-toyl)-propionate), 0.5 wt% of 5,7-di-t-butyl-3-(3,4-dimethylphenyl)-3H-benzofuran-2-one, 1 wt% of 1,1,1',1'-tetramethyl-4,4'-(methylene-di-p-phenylene)disemicarbazide, 1 wt% of poly(N,N-diethyl-2-aminoethyl methacrylate), and 0.1 wt% of titanium dioxide as additives relative to the solid content of the polymer of Example 1 above.

[0093] The spinning solution obtained as above was dry-spun to produce a 40 denier / 3 filament polyurethaneurea elastic yarn at a speed of 900 m / min, and its physical properties were evaluated and are shown in Table 2 below.

[0094]

[0095] Comparative Example 6

[0096] Polyurethaneurea elastic yarn was prepared by carrying out the same procedure as in Example 5, except that the polyurethaneurea solution of Comparative Example 1 was used, and its physical properties were evaluated and shown together in Table 2 below.

[0097]

[0098] Test example

[0099] The physical properties of the polyurethaneurea solutions prepared in Examples 1-4 and Comparative Examples 1-5 and the polyurethaneurea elastic yarns prepared in Examples 5 and Comparative Example 6 were evaluated by the following method, and the results are shown in Tables 1 and 2 below.

[0100] (1) NCO% = [100 × 2 × NCO formula weight × (capping ratio - 1)] / (diisocyanate molecular weight × capping ratio) + polyol molecular weight

[0101] (2) Strength and elongation of the yarn: Measurements were taken using an automatic strength and elongation measuring device (manufacturer: Textechno, model name: MEL) with a sample length of 10 cm and a tensile speed of 100 cm / min. At this time, the strength and elongation values ​​at break were measured, and the 200% modulus of the load applied to the yarn when the yarn is stretched by 200% was also measured.

[0102] (3) Yarn Power (5 th unload @200%): Using an automatic tensile strength measuring device (manufacturer: Textechno, model name: MEL), a sample length of 10cm x 20 strands is stretched 300% five times at a tensile speed of 100 cm / min, and the power at the 200% section during the 5th recovery is measured and then divided by the number of strands and denier (de).

[0103] (4) Turbidity: To evaluate the storage stability of the polyurethaneurea elastomer solution, the turbidity of the secondary polymer (polyurethane polymer immediately after reacting the polyurethane prepolymer with the chain extender and chain terminater) was measured 5 times using Turbidity Meters (Manufacturer: HANNA instruments, Model: HI 98703) and the minimum value was used.

[0104] (5) Turbidity change rate: The turbidity of the secondary polymer was measured at 24-hour intervals while storing it in a 40℃ oven.

[0105] Turbidity change rate [NTU / hr] = (Turbidity after 72 hours - Initial turbidity) / 72

[0106] (6) Toxicity in solvent: Toxicity was determined by whether it was listed on the REACH SVHC Candidate List of substances of very high concern for Authorisation - ECHA (European Chemical Agency).

[0107] (7) Flash point measurement: The measurement method followed the ASTM D 1310-86 standard, and the procedure is as follows, and the results are shown in Table 3.

[0108] ① 70 ml of each sample of solvent and polymer solution was placed in a sample cup and heated starting from a temperature about 20℃ lower than the predicted flash point.

[0109] ② The heating rate was adjusted to 1 ± 0.25℃ / min.

[0110] ③ For every 0.5℃ increase in temperature, the test salt was brought close to the surface of the flammable liquid for 1 second.

[0111] ④ When ignition occurred, the duration of the ignition was measured using a timer.

[0112] ⑤ The temperature at which the ignition duration was 5 seconds or more was recorded as the combustion point.

[0113] Classification Capping Non-chain Extender Solvent Solution Concentration (%) Intrinsic Viscosity (IV) Turbidity (NTU) Turbidity Change Rate (NTU / hr) Presence or Absence of Toxicity Example 1 1.65 EDA:12 PDA=80:202 - Pyrrolidone 35 0.9 4 0.3 7 0.32 None Example 2 1.65 EDA:12 PDA=80:202 - Pyrrolidone 37 0.9 9 0.3 9 0.34 None Example 3 1.72 EDA:12 PDA=100:02 - Pyrrolidone 35 1.0 3 0.4 2 0.37 None Example 4 1.85 EDA:12 PDA=50:502 - Pyrrolidone 40 1.1 1 0.5 1 0.42 None Comparative Example 11.65EDA:12PDA=80:20DMAc350.950.410.36 Present Comparative Example 21.72EDA:12PDA=100:0DMAc350.970.480.49 Present Comparative Example 31.85EDA:12PDA=50:50DMAc401.100.530.41 Present Comparative Example 41.65EDA:12PDA=80:20DMSO350.5210 or higher Unmeasurable None Comparative Example 51.65EDA:12PDA=80:20Cyrene™350.4510 or higher Unmeasurable None

[0114] Classification Capping Solution Concentration (%) Strength (g / d) Elongation (%) 200% Modulus (g) Yarn Power (g) Example 5 1.65 2-Pyrrolidone 35 1.18 47 47.01 15 Comparative Example 6 1.65 DMAC 35 1.23 47 57.21 18

[0115] Classification Solvent Solvent Flash Point (°C) Polymer Solution Flash Point (°C) Example 52 - Pyrrolidone 129132 Comparative Example 6 DMAc9394

[0116] As confirmed by the results in Tables 1 to 3 above, using the pyrrolidone-based organic solvent of the present invention, it was possible to obtain a polyurethaneurea solution having excellent solubility and solution stability under various polyurethaneurea compositions and solution concentration conditions, and when polyurethaneurea elastic yarn was manufactured using this, an elastic yarn with physical properties similar to existing ones could be obtained. In addition, process stability could be secured with a high flash point.

[0117] Although the present invention has been described in detail above with reference to preferred embodiments, the invention is not limited thereto. The above embodiments may be modified or changed without departing from the spirit and scope of the invention, and those skilled in the art will understand that such modifications and changes are also included in the present invention.

Claims

1. A polyurethaneurea composition comprising a polyurethaneurea polymer and a pyrrolidone-based solvent of the following chemical formula 1. [Chemical Formula 1] In the above equation, R 1 is hydrogen, an alkyl group having 1 to 4 carbon atoms, or a carboxyl group, and R 2 is hydrogen or an alkyl group having 1 to 8 carbon atoms.

2. A method for manufacturing a polyurethaneurea elastic yarn comprising the steps of: dissolving a polyurethaneurea precursor in an organic solvent of the following chemical formula 1 and then performing a chain extension reaction to obtain a polyurethaneurea solution; and preparing a spinning solution using the obtained polyurethaneurea solution and spinning it. [Chemical Formula 1] In the above equation, R 1 is hydrogen, an alkyl group having 1 to 4 carbon atoms, or a carboxyl group, and R 2 is hydrogen or an alkyl group having 1 to 8 carbon atoms.

3. In paragraph 2, the above method A method for manufacturing a polyurethaneurea elastic yarn, characterized by including the step of preparing a polyurethaneurea precursor by polymerizing a polyol and an excess amount of diisocyanate, and then preparing a polyurethaneurea solution by adding a chain extender and a chain terminater to a prepolymer solution obtained by dissolving the polyurethaneurea precursor in a solvent of Formula 1.

4. A method for manufacturing a polyurethane-urea elastic yarn according to claim 3, wherein the diisocyanate is one or more selected from the group consisting of 4,4'-diphenylmethane diisocyanate, 1,5'-naphthalene diisocyanate, 1,4'-phenylene diisocyanate, hexamethylene diisocyanate, 1,4'-cyclohexane diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, and isophorone diisocyanate.

5. A method for manufacturing a polyurethane-urea elastic yarn according to claim 3, characterized in that the chain extender is one or more diol or diamine chain extenders.

6. A method for manufacturing a polyurethane-urea elastic yarn according to claim 5, wherein the diamine chain extender is one or more selected from the group consisting of ethylenediamine, 1,2-diaminopropane, 1,3-diaminopropane, 1,4-diaminobutane, 2,3-diaminobutane, 1,5-diaminopentane, 1,6-hexamethylenediamine and 1,4-cyclohexanediamine.

7. A method for manufacturing a polyurethane urea elastic yarn according to claim 3, characterized in that the chain termination agent is one or more selected from the group consisting of diethylamine, monoethanolamine, cyclohexylamine, and dimethylamine.

8. A method for manufacturing a polyurethane urea elastic yarn according to paragraph 3, characterized in that the method involves dry spinning a polyurethane urea spinning solution.

9. A polyurethane-urea elastic yarn manufactured by the method for manufacturing a polyurethane-urea elastic yarn according to any one of paragraphs 2 through 8.

10. The polyurethaneurea elastic yarn according to claim 9, characterized in that the solvent residue amount of the polyurethaneurea elastic yarn is 0.1% to 0.90%.

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