KR100580325B1 - A polyurethaneurea elastic fiber with excellent dyeing property and light resistance, and a process of preparing the same - Google Patents

Abstract

The present invention relates to a polyurethane urea elastic fiber and a method of manufacturing the same, in the manufacture of a polyurethane urea elastic fiber by spinning a polyurethane urea polymer solution, adding a diester compound containing a tertiary amine to the polymer solution It is characterized by. The present invention can effectively prevent the process failure due to heat withdrawal of the additive composition during spinning. The fiber of the present invention is very excellent in dyeing and light resistance.

Elastic fiber, polyurethaneurea, dyeing, UV stabilizer, light resistance, diester compound, tertiary amine.

Description

A polyurethaneurea elastic fiber with excellent dyeing property and light resistance, and a process of preparing the same}

The present invention relates to a polyurethaneurea elastic fiber excellent in dyeing and light resistance, and a manufacturing method thereof.

More specifically, a new type of compound composition is added to a known additive composition composed of an antioxidant, a radioactive agent, a quencher, and a whitening agent, to improve processability by preventing a process obstacle due to thermal decomposition of the additive during spinning, The present invention relates to a method for producing a polyurethaneurea elastic fiber having excellent weather resistance, particularly dyeing and light resistance, while maintaining the inherent physical properties of the elastic fiber.

Typically polyurethaneurea elastic fibers are produced by wet or dry spinning a polyurethaneurea polymer. In this case, the polyurethaneurea polymer used may be prepared by a one-step polymerization method of simultaneously reacting a polyol having a high molecular weight of 2,000 g / mol, an excess of diisocyanate and a chain extender, which is a diol or a diamine compound, and the high molecular weight. The polyol and an excess of diisocyanate are first prepolymerized to prepare a prepolymer in one step, and then a chain extender, which is a diol or a diamine compound, may be added thereto to prepare a two-step polymerization process. .

Polyurethane urea elastic fibers are used in stockings and women's underwear because of their excellent elasticity and elastic recovery, in particular, they are widely used in sportswear or swimwear by using their elasticity. However, when the polyurethane urea elastic fiber is exposed to the atmosphere, the physical properties and colors of the elastic fiber change due to sunlight, and are easily discolored by the waste gas in the atmosphere. In addition, polyurethaneurea elastic fiber has a disadvantage that it is not structurally dyed in acid dyes.

In order to compensate for these drawbacks, Korean Patent Application No. 90-10867 proposes a method of using a phenolic antioxidant, an amine UV stabilizer, and a methacrylate dye enhancer as an additive. However, the methacrylate dye enhancer is weak in heat resistance and has a disadvantage of causing serious problems in the spinning process by leaching and subliming to the outside of the polymer during high temperature spinning.

Korean Patent No. 160468 describes a method of using a phenolic antioxidant, a benzotriazole light stabilizer, a hindered amine UV stabilizer, a semicarbazide-based waste gas stabilizer as an additive, and Korean Patent Publication No. 93- 11337 describes a method for producing weather resistant elastic fibers using phenolic antioxidants, phosphite antioxidants, semicarbazide-based yellowing inhibitors and benzotriazole-based light stabilizers, but is commonly used in the above methods. The benzotriazole-based light stabilizer was not only poor in heat resistance, but also lacked in compatibility with the polyurethaneurea polymer, which caused leaching and sublimation during spinning, which adversely affected the spinning process.

Republic of Korea Patent No. 129113 describes a method of using a polyurethane-based dye enhancer comprising a tertiary amine in order to improve the dyeability of polyurethane elastic fibers, the method is a dye-promoting effect compared to the amount of the polyurethane-based dye enhancer There are disadvantages that are not outstanding.

As described above, a combination including various stabilizers has been proposed to improve the dyeing and light resistance of polyurethane urea elastic fibers, but it produces polyurethane urea elastic fibers with excellent dyeing and light resistance while maintaining a stable spinning process in the long term. The technology to do this has not been developed until now.

The purpose of the present invention is to improve the dyeing and light resistance of polyurethaneurea elastic fiber by using a new type of additive, and at the same time, to solve the problems of the spinning process caused by the heat withdrawal of the weak heat-resistant additives, which is stable in the long term. To provide a method for producing a polyurethane urea elastic fiber.

The present invention significantly improves the dyeing and light resistance of polyurethaneurea elastic fibers by using a new type of additive, and at the same time prevents the process failure caused by the heat withdrawal of the additives during the spinning process. To provide a method for producing a stable as.

The present invention is to produce a polyurethane urea elastic fiber by spinning a polyurethane urea polymer solution, characterized in that the diester compound containing a tertiary amine of the general formula (I) below to the polymer solution.

                          -Below-

(Wherein R ₁ and R ₂ are alkyl having 1 to 10 carbon atoms, and R ₃ to R ₆ are hydrogen or linear or branched alkyl having 1 to 4 carbon atoms.)

In addition, the polyurethaneurea elastic fiber of the present invention contains 0.1 to 3.0% by weight of a diester compound containing a tertiary amine of the general formula (I), and has a distribution ratio of 5 to 97%, which indicates dyeing resistance, and a strong retention rate indicating light resistance. It is characterized by the 60-97%.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

First, the present invention first prepolymerizes 1.5 to 1.8 moles of the diisocyanate compound with respect to 1 mole of the high molecular weight diol compound having a number average molecular weight of 1500 to 2000, and then a suitable amount of the solvent is mixed to prepare a solution of the prepolymer, followed by preparing a diamine compound. 70-99 mol% of the polymer and 1-30 mol% of the monoamine compound are used to simultaneously extend the chain and stop the prepolymer so that the polypropylene of 1500-5000 poise (40 ° C.) is suitable for spinning. Urethane urea polymer is prepared.

Ethylenediamine, 1,2-diaminopropane or 2-methyl-1,5-pentamethylenediamine may be applied to the diamine compound, or a mixture of ethylenediamine and 1,2-diaminopropane or ethylenediamine And 2-methyl-1,5-pentamethylenediamine may be applied in a mixed form. As the monoamine, diethylamine is mainly used.

Next, the diester compound containing the tertiary amine of the general formula (I) is added to the polyurethaneurea polymer prepared as described above. It is more preferred to add conventional hindered phenolic antioxidants and waste gas stabilizers with these compounds. In addition, it is more preferable to add a known type of rutile (Rutile) titanium oxide, blue pigment, magnesium stearate and the like.

In the present invention, the amount of the diester compound containing the tertiary amine of the general formula (I) is preferably 0.1 to 3.0% by weight relative to the polymer solid content. If the amount of the compound is less than 0.1% by weight, the effect of improving the light resistance and dyeing property of the elastic fiber may be lowered, and if it exceeds 3.0% by weight, it may adversely affect radioactivity.

In the present invention, the compound of general formula (I) may be added to the polyurethane urea polymer simultaneously with a conventional antioxidant, waste gas stabilizer, magnesium stearate, titanium oxide and / or blue pigment.

In this case, a sterically hindered phenolic antioxidant may be used as an antioxidant, a semicarbazide-based waste gas stabilizer as a waste gas stabilizer, and ultramarine blue may be used as a blue pigment. As the titanium oxide, rutile titanium oxide is preferably used.

For example, 0.1-1.5% by weight of sterically hindered phenolic antioxidants, 0.1-2.0% by weight of semicarbazide-based waste gas stabilizers, 0.05-4.0% by weight of titanium oxide in tutyl form, 0.1-0.5% by weight of magnesium stearate and blue 0.005 to 0.02% by weight of the pigment may be added to the polyurethaneurea polymer together with the compound of formula (I).

The present invention is to produce a polyurethane urea elastic fiber of the present invention by dry or wet spinning the polyurethane urea polymer is added to the additive composition as described above in a conventional manner.

In this invention, since the diester compound of the said general formula (I) which is excellent in heat resistance is added, even if the addition amount is small, it is very excellent in light resistance. As a result, it is possible to effectively prevent the phenomenon that the additive is embrittled by heat during the high-temperature spinning process adversely affects the spinning process. In addition, since the diester compound including the tertiary amine of the general formula (I) plays a role of a heat enhancer and a dye enhancer, dyeing of fibers is improved without using a separate dye enhancer.

The elastic fiber of the present invention has a distribution ratio of 5 to 97% showing dyeing property, and a strong retention rate of 60 to 97% showing light resistance.

In the present invention, dyeability and light resistance are evaluated by the following method.

Light resistance

Light resistance was expressed by strong retention and yellowness index (Δb).

(Iii) Yellowness index (△ b): 40 denier polyurethane urea elastic fibers are wound on an aluminum sheet and measured after 24 hours treatment with sunshine carbon arc in a wet-o-meta.

(Ii) Strength retention rate (%): The strength of elastic fibers before and after dimming ultraviolet rays in the WED-O-MET is measured by instron (sample length 5cm, speed 50cm / min) and substituted by the following formula.

Dyeing

Dyeability is expressed by the partition ratio evaluated through the following steps.

(Iii) Using a tube-knitter, nylon circular knits and polyurethaneurea elastic fiber circular knits are knitted in two batches, and they are refined and dyed under the following conditions.

<Refining conditions>: Refining was carried out in a Matis dyeing machine using a refining bath (bath ratio: 1/30) having a composition of ₃ g / l Na ₂ CO ₃ and 1 g / l detergent for 80 ° C. × 30 minutes.

<Dyeing condition>: Dyeing with acid dye (Nylosan Red N-2RBL) 0.5% owf saline at 40 ° C for 60 minutes, then complete the dyeing while lowering the temperature to 80 ° C at a temperature reduction rate of 1 ° C / min.

(Ii) The reflectances of the nylon circular knitted fabrics and the polyurethaneurea elastic fiber circular knitted fabrics dyed as described above were measured with a spectrophotometer, and each K / S was measured at the maximum absorption wavelength.

        Where R is the reflectance, K is the extinction coefficient, and S is the scattering coefficient.

(Iv) Substituting the K / S values measured above into the following equation, calculate the distribution ratio (%).

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited only to the following examples.

Example 1

1.7 moles of 4,4′-diphenylmethane diisocyanate was mixed with 1 mole of polytetramethylene glycol having a molecular weight of 1800 and reacted at 90 ° C. for 90 minutes to synthesize a prepolymer having an isocyanate at the sock end. After cooling the prepolymer to 40 ° C., N, N′-dimethylacetamide was added to prepare a solution containing about 45% of the prepolymer. The prepolymer solution was lowered to 5 ° C., followed by vigorous stirring, while slowly adding a N, N'-dimethylacetamide solution containing 96 equivalents of ethylenediamine and 6 equivalents of diethylamine to the prepolymer, while slowly extending the chain and stopping the chain. The final polyurethaneurea solution was prepared. 1,3,5-tris (4-t-butyl-3-hydroxy-2,6-dimethylbenzene) -1,3,5-triazine-2,4,6- (1H in the obtained polyurethaneurea solution 2.5 wt% of a (3H, 5H) trione antioxidant, based on the solid content of the polyurethaneurea solution, of a diester compound containing a tertiary amine having a structure of the following general formula (II) (2.5% by weight of the polyurethaneurea solution solids) ), 0.5% by weight of titanium oxide, 0.01% by weight of blue pigment (ultramarine blue) was added to spin in an atmosphere of 220 ℃ to prepare a polyurethane denier polyurethane urea of 40 denier. The results of evaluating the light resistance and dyeability of the prepared elastic fibers are shown in Table 2.

Example 2 and Comparative Example 1

Example 1 except that the amount of the diester compound (hereinafter referred to as "Y compound") containing the tertiary amine having the structure of Formula (II) relative to the solid content of the polyurethane solution was changed as shown in Table 1 Polyurethane urea elastic fiber of 40 denier was prepared in the same process. The results of evaluating the light resistance and dyeability of the prepared elastic fibers are shown in Table 2.

Manufacture conditions division Example 1 Example 2 Comparative Example 1 Y compound dose (% by weight) 2.5 0.1 0

Property evaluation result division Light resistance Dyeing percentage (%) Δb Strong retention rate (%) Example 1 3 96 96 Example 2 10 70 10 Example 3 36 8 2

The present invention can improve the dyeing and light resistance of the polyurethane urea elastic fiber, it can also improve the operation of the spinning process.

Claims (5)

In spinning a polyurethane urea polymer solution to produce a polyurethane urea elastic fiber, it is excellent in dyeing and light resistance, characterized by adding a diester compound containing a tertiary amine of the general formula (I) Method for producing polyurethane urea elastic fiber.                           -Below-

(Wherein R ₁ and R ₂ are alkyl having 1 to 10 carbon atoms, and R ₃ to R ₆ are hydrogen or linear or branched alkyl having 1 to 4 carbon atoms.) A polyurethane urea elastic fiber having excellent dyeing and light resistance according to claim 1, wherein a diester compound comprising a tertiary amine of the general formula (I) is added in an amount of 0.01 to 3.0% by weight based on the polyurethane urea polymer solid content. Way. Polyurethane urea elastic fiber excellent in dyeing properties and light resistance, characterized by containing 0.1 to 3.0% by weight of a diester compound containing a tertiary amine of the general formula (I) below.                           -Below-

(Wherein R ₁ and R ₂ are alkyl having 1 to 10 carbon atoms, and R ₃ to R ₆ are hydrogen or linear or branched alkyl having 1 to 4 carbon atoms.) The polyurethaneurea elastic fiber excellent in dyeing property and light resistance of Claim 3 whose distribution ratio which shows dyeing property is 5 to 97%. The polyurethane urea elastic fiber having excellent dyeing and light resistance according to claim 3, wherein the polyurethane urea elastic fiber has a strong retention of 60 to 97%.