Light-transmission-proof spandex and preparation method thereof

Abstract

The invention relates to anti-light-transmission spandex and a preparation method thereof, the anti-light-transmission spandex comprises polyurethane-urea and a delustering agent, and the delustering agent accounts for 0.5%-5% of the anti-light-transmission spandex by mass; the delustering agent comprises a mixture of titanium dioxide, silicon dioxide and acrylate. The preparation method comprises the following steps: reacting polymer polyol with polyisocyanate to obtain a polyurethane prepolymer, and dissolving the polyurethane prepolymer in a solvent to obtain a polyurethane prepolymer solution; the obtained polyurethane prepolymer solution, a diamine chain extender and an amine chain terminator are subjected to a reaction, and a polyurethane-urea solution is obtained; mixing a polyurethane-urea solution and a delustering agent which are used as raw materials in proportion; performing dry spinning to obtain the anti-light-transmission spandex with at least one section shape selected from a round shape, a three-leaf shape and a cross shape; according to the product, conventional physical property indexes are basically consistent with those of products of the same specification, so that fibers are light-transmitting-proof and easy to dye, and the problems that light and thin fabric containing spandex is easy to transmit light and poor in body shielding performance are solved.

Description

Technical Field

[0001] The invention relates to spandex with anti-light transmission performance and a preparation method thereof, belonging to the technical field of polyurethane elastic fiber manufacturing. Background Art

[0002] Spandex is the abbreviation of polyurethane fiber, which is an elastic fiber. It not only has unique elastic properties, but also has excellent acid and alkali resistance, sweat resistance, water washing resistance and wear resistance. According to the different surface gloss, it is usually divided into glossy, semi-matt and matt spandex. It has been widely used in clothing, home furnishings, sanitary materials, shoes and other fields, and the general content is 5-30%. With the increase of per capita income level, the demand for clothing consumption performance has gradually upgraded, and elastic fabrics have become more popular among consumers.

[0003] Light and breathable clothing is popular among the public in the hot summer because it can dissipate heat and sweat. However, unlike winter clothes that use dark and heavy fabrics, light and thin fabrics often have poor light-proof properties and poor body-covering properties, and often result in embarrassing phenomena such as underwear and skin exposure. Therefore, how to improve the light-proof properties of thin fabrics is a major problem faced by technicians in the textile field. From a theoretical and technical point of view, it can be solved by increasing the emission, absorption, scattering, and transmission of visible light by textiles. The specific implementation methods include changing the cross-sectional shape of the fiber, adding relevant additives, coating finishing, and setting fabric structure parameters. The existing relatively mature technology is mainly achieved through coating finishing, but for clothing textiles, coating finishing affects their wearing comfort, and their durability is also insufficient. Especially for spandex-containing fabrics, glossy or semi-matt products are generally used, which have the following disadvantages: ① There is a color difference with other fibers in the fabric. Due to the poor dyeing performance of spandex (acid dyes generally cannot be dyed), the "whitening" phenomenon often occurs; ② When the elastic fabric is stretched when worn, the gap becomes larger. If the spandex itself has good light transmittance, the anti-light transmittance performance will be aggravated.

[0004] Patents CN207130385U, CN207130386U, CN207130391U, and CN103409846A, regardless of whether the fabric components are spandex or non-spandex fibers, all achieve the effect of preventing light transmission by adding the matting agent titanium dioxide. Patent CN217324523U achieves good air permeability and anti-transmission effects by changing the weaving structure of the fabric. Patent CN220846451U uses matting polyester filaments with special cross-sections to achieve anti-light transmission. Patent CN116024713A uses fully matte polyester and spandex coated yarns. From the above related patents, it is not difficult to find that in order to achieve the effect of preventing light transmission, the fibers in most fabrics currently use matting fibers prepared with matting agents, and a small number use optimized fabric weaving structures. However, such improvement is not satisfactory. From the perspective of spandex production, excessive addition of inorganic particulate titanium dioxide will increase the burden on the production grinding system and affect the mechanical properties of the fiber. From the perspective of downstream weaving, the increase in titanium dioxide will increase fiber friction, which can easily cause weaving problems such as "powder loss", thread jamming, and thread breakage during the textile process. In addition, after the fabric is dyed, spandex is still difficult to dye and whitens. Summary of the invention

[0005] Technical problem: The purpose of the present invention is to prepare a light-proof spandex and its preparation method. The product maintains conventional physical properties that are basically consistent with products of the same specifications, so that the fiber has light-proof properties and is easy to dye, thereby solving the problem that thin fabrics containing spandex are easy to transmit light and have poor body-covering properties.

[0006] Technical solution: The anti-light transmission spandex of the present invention comprises polyurethane-urea and a matting agent, wherein the mass percentage of the matting agent in the anti-light transmission spandex is 0.5% to 5%;

[0007] The matting agent comprises a mixture of titanium dioxide, silicon dioxide and acrylate;

[0008] The matting agent includes the following mass components:

[0009] Titanium dioxide 10-30%;

[0010] Silicon dioxide 10-30%;

[0011] Acrylate 40-80%.

[0012] The matting agent also includes stearate and / or talc, with a mass composition of:

[0013] Titanium dioxide 10-20%;

[0014] Silicon dioxide 10-20%;

[0015] Acrylate 40-70%;

[0016] Stearate and / or talc 10-20%.

[0017] The mass percentage of stearate in the anti-light transmission spandex calculated based on the total mass of the anti-light transmission spandex does not exceed 0.5%.

[0018] The polyurethane-urea comprises the reaction product of a polymer polyol, a polyisocyanate, a diamine chain extender and an amine chain terminator.

[0019] The polymer polyol includes any one of polytetramethylene ether glycol, polyethylene glycol or polypropylene glycol, or a combination of at least two thereof;

[0020] The polyisocyanate includes any one of diphenylmethane diisocyanate, toluene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate or dicyclohexylmethane diisocyanate, or a combination of at least two thereof;

[0021] The diamine chain extender includes aliphatic diamine and non-aliphatic diamine; the molar ratio of the aliphatic diamine and the non-aliphatic diamine is 70:30 to 95:5.

[0022] The aliphatic diamine includes an aliphatic diamine having 2 to 30 carbon atoms, and further includes any one or a combination of at least two of ethylenediamine, propylenediamine, butylenediamine, pentylenediamine, methylpentylenediamine, methylpropylenediamine, hexylenediamine, phenylenediamine, phenylenediamine, diaminocyclohexane or hexamethylenediamine;

[0023] The non-aliphatic diamine includes nitrogen heterocyclic diamine, further includes any one of pyrazine diamine, piperazine diamine, and piperazine diethylamine, or a combination of at least two thereof, and further includes any one of 2,5-pyrazine diamine, 3,4-pyrazine diamine, 4,5-diaminopyrazine, 2,3-diaminopiperazine, and 1,4-piperazine diethylamine, or a combination of at least two thereof;

[0024] The amine chain terminator includes a monoamine having 2 to 20 carbon atoms, and is more preferably any one of diethylamine, isopropylamine, n-butylamine, tert-butylamine, hexylamine, diethylamine, dimethylamine, di-n-butylamine, di-tert-butylamine, diisobutylamine, diisopropylamine, diethylamine, dipropylamine, cyclohexylamine or ethanolamine, or a combination of at least two thereof.

[0025] The stearate includes one or more of aluminum stearate, magnesium stearate, zinc stearate, calcium stearate, and barium stearate.

[0026] The acrylate includes at least one of polyether-modified acrylate, polyester-modified acrylate and epoxy-modified acrylate.

[0027] The polyether-modified acrylate includes one or more of polyethylene glycol-modified acrylate, polypropylene glycol-modified acrylate, polyethylene glycol-propylene glycol-modified acrylate, and polytetramethylene ether glycol-modified acrylate;

[0028] The polyester modified acrylate includes one or more of polycaprolactone modified acrylate, polycarbonate modified acrylate, and polyadipate modified acrylate;

[0029] The epoxy modified acrylate includes one or more of bisphenol A epoxy acrylate, novolac epoxy acrylate, epoxidized acrylate and modified epoxy acrylate.

[0030] The preparation method of the anti-light transmission spandex of the present invention is:

[0031] Step 1. polymer polyol and polyisocyanate react to obtain a polyurethane prepolymer, and the obtained polyurethane prepolymer is dissolved in a solvent to obtain a polyurethane prepolymer solution; the mass percentage of isocyanate group NCO in the polyurethane prepolymer is 2.0% to 3.5%;

[0032] Step 2. reacting the obtained polyurethane prepolymer solution, diamine chain extender and amine chain terminator to obtain a polyurethane-urea solution; the molar ratio of NCO in the polyurethane prepolymer to the amine group in the diamine chain extender and the amine chain terminator is 1:(1.01-1.10);

[0033] Step 3. Mixing the polyurethane-urea solution and the matting agent as raw materials in proportion;

[0034] Step 4. The polyurethane-urea solution is subjected to aging treatment before spinning, and the aging temperature is 30-45° C.;

[0035] Step 5. Dry spinning, wherein the cross-sectional shape or arrangement of the spinneret holes on the spinneret plate in the spinneret assembly in the spraying step is adjusted, and the cross-sectional shape of the light-proof spandex includes at least one of a circular shape, a trilobal shape, and a cross shape;

[0036] The anti-light transmission spandex is obtained.

[0037] Beneficial effects: Compared with the prior art, the product of the present invention maintains conventional physical properties that are basically consistent with products of the same specifications, and the fiber has the characteristics of anti-light transmission and easy dyeing, thus solving the problem that light and thin fabrics containing spandex are easy to transmit light and have poor body covering properties.

[0038] The invention adds a specific matting agent to spandex to give the spandex fiber excellent anti-light transmission property, and the irregular cross section further improves the anti-light transmission property of the fiber, and finally prepares a spandex product with excellent anti-light transmission property. DETAILED DESCRIPTION

[0039] The anti-transmittance spandex comprises polyurethane-urea and a matting agent, and the mass percentage of the matting agent in the anti-transmittance spandex is 0.5% to 5%;

[0040] The matting agent includes a mixture of titanium dioxide, silicon dioxide, stearate, talc and acrylate;

[0041] Preferably, the matting agent comprises the following components:

[0042] Titanium dioxide 10-30%;

[0043] Silicon dioxide 10-30%;

[0044] Acrylate 40-80%;

[0045] The particle size of titanium dioxide and silicon dioxide is 0.2 to 10 μm;

[0046] The stearate includes one or more of aluminum stearate, magnesium stearate, zinc stearate, calcium stearate, and barium stearate;

[0047] The acrylate includes at least one of polyether-modified acrylate, polyester-modified acrylate and epoxy-modified acrylate;

[0048] The polyether-modified acrylate includes one or more of polyethylene glycol-modified acrylate, polypropylene glycol-modified acrylate, polyethylene glycol-propylene glycol-modified acrylate, and polytetramethylene ether glycol-modified acrylate;

[0049] The polyester modified acrylate includes one or more of polycaprolactone modified acrylate, polycarbonate modified acrylate, and polyadipate modified acrylate;

[0050] The epoxy-modified acrylate includes one or more of bisphenol A epoxy acrylate, novolac epoxy acrylate, epoxidized acrylate and modified epoxy acrylate;

[0051] In some examples of the present invention, the acrylate comprises polyether-modified acrylate;

[0052] Further preferably, the matting agent further comprises stearate and / or talc;

[0053] More preferably, the matting agent comprises the following components:

[0054] Titanium dioxide 10-20%;

[0055] Silicon dioxide 10-20%;

[0056] Acrylate 40-70%;

[0057] Stearate and / or talc 10-20%;

[0058] Preferably, the mass percentage of stearate in the light-proof spandex does not exceed 0.5%, calculated based on the total mass of the light-proof spandex.

[0059] The polyurethane-urea comprises the reaction product of a polymer polyol, a polyisocyanate, a diamine chain extender and an amine chain terminator;

[0060] The polymer polyol includes any one of polytetramethylene ether glycol, polyethylene glycol or polypropylene glycol or a combination of at least two thereof, and polytetramethylene ether glycol is further preferred;

[0061] The number average molecular weight of the polymer polyol is 1000 to 3000;

[0062] The polyisocyanate includes any one of diphenylmethane diisocyanate, toluene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate or dicyclohexylmethane diisocyanate or a combination of at least two thereof, and diphenylmethane diisocyanate is more preferably used;

[0063] Diamine chain extenders include aliphatic diamines and non-aliphatic diamines;

[0064] The aliphatic diamine includes an aliphatic diamine having 2 to 30 carbon atoms, and further includes any one or a combination of at least two of ethylenediamine, propylenediamine, butylenediamine, pentylenediamine, methylpentylenediamine, methylpropylenediamine, hexylenediamine, phenylenediamine, phenylenediamine, diaminocyclohexane or hexamethylenediamine;

[0065] The non-aliphatic diamine includes nitrogen heterocyclic diamine, further includes any one of pyrazine diamine, piperazine diamine, and piperazine diethylamine, or a combination of at least two thereof, and further includes any one of 2,5-pyrazine diamine, 3,4-pyrazine diamine, 4,5-diaminopyrazine, 2,3-diaminopiperazine, and 1,4-piperazine diethylamine, or a combination of at least two thereof;

[0066] Furthermore, the molar ratio of the aliphatic diamine to the non-aliphatic diamine is 70:30 to 95:5;

[0067] The amine chain terminator includes a monoamine having 2 to 20 carbon atoms, and is more preferably any one of diethylamine, isopropylamine, n-butylamine, tert-butylamine, hexylamine, diethylamine, dimethylamine, di-n-butylamine, di-tert-butylamine, diisobutylamine, diisopropylamine, diethylamine, dipropylamine, cyclohexylamine or ethanolamine, or a combination of at least two thereof.

[0068] The polyurethane-urea is prepared by the following method, which comprises the following steps:

[0069] 1) reacting a polymer polyol with a polyisocyanate to obtain a polyurethane prepolymer, and dissolving the obtained polyurethane prepolymer in a solvent to obtain a polyurethane prepolymer solution;

[0070] 2) reacting the obtained polyurethane prepolymer solution, diamine chain extender and amine chain terminator to obtain a polyurethane-urea solution.

[0071] Preferably, the mass percentage of isocyanate group NCO in the polyurethane prepolymer is 2% to 3.5%;

[0072] The molar ratio of the diamine chain extender to the monoamine end-capping agent is 6:1 to 20:1;

[0073] Preferably, the molar ratio of NCO in the polyurethane prepolymer to the amine groups in the diamine chain extender and the amine chain terminator is 1:(1.01-1.10);

[0074] Further, the solvent includes N,N-dimethylacetamide DMAc, N-methyl-2-pyrrolidone NMP, dimethylformamide DMF; as an example, the solvent is DMAc;

[0075] In some embodiments of the present invention, the mass percentage of the polyurethane prepolymer solution is 30-40%;

[0076] The diamine chain extender and the amine chain terminator are mixed with a solvent to obtain a mixed solution, wherein the mass percentage of the mixed solution is 3 to 10%;

[0077] In some embodiments of the present invention, the reaction temperature of step 1) is 70-95°C;

[0078] The reaction temperature of the step 2) is 0-10°C;

[0079] There is no specific requirement for the reaction time, just ensure that all raw materials react fully.

[0080] The method for preparing the anti-light transmission spandex comprises: using the polyurethane-urea solution and the matting agent as raw materials through spinning to obtain the anti-light transmission spandex fiber;

[0081] Furthermore, the polyurethane-urea solution is subjected to aging treatment before spinning, and the aging temperature is 30-45°C;

[0082] The spinning is dry spinning;

[0083] The dry spinning process includes the steps of spraying, stretching and drying;

[0084] Furthermore, other functional additives may be added to the polyurethane-urea solution as long as they do not deteriorate the performance of the product, such as one or more of lubricants, antioxidants, anti-ultraviolet agents, matting agents, dyeing additives, and chlorine-resistant additives.

[0085] Preferably, the cross-sectional shape of the anti-transmittance spandex includes at least one of a circular shape, a trilobal shape, and a cross shape; more preferably, the cross-sectional shape includes at least one of a trilobal shape and a cross shape;

[0086] Furthermore, the cross-sectional shape can be adjusted by the cross-sectional shape or arrangement of the spinneret holes on the spinneret plate in the spinneret assembly in the ejection step;

[0087] The following examples are used to describe the production process of the present invention in detail, but these examples should not be construed as limiting the present invention in any sense.

[0088] (1) Preparation of polyurethane urea:

[0089] 1) adding polymer polyol and polyisocyanate into a static mixer, controlling the reaction temperature to 85° C., and reacting to obtain a polyurethane prepolymer having an NCO mass percentage of 2.55%;

[0090] Adding polyurethane prepolymer and solvent DMAc into a static mixer and fully dissolving them to obtain a polyurethane prepolymer solution with a mass percentage of 40%;

[0091] 2) adding a mixed solution containing 5% by weight of a diamine chain extender and an amine chain terminator to the polyurethane prepolymer solution, controlling the reaction temperature to 4° C., and reacting to obtain a polyurethane-urea solution;

[0092] Wherein, the molar ratio of the diamine chain extender to the monoamine end-capping agent in the mixed solution is 15:1;

[0093] The molar ratio of NCO in the polyurethane prepolymer to the amine groups in the diamine chain extender and the amine chain terminator is 1:1.01.

[0094] Example 1

[0095] The anti-translucent spandex comprises 99% by mass of polyurethane-urea and 1% by mass of a matting agent.

[0096] Matting agents include the following components:

[0097] Titanium dioxide 10%;

[0098] Silicon dioxide 15%;

[0099] Polyethylene glycol modified acrylate 55%;

[0100] Aluminium stearate 20%.

[0101] The polyurethane-urea comprises a reaction product of polytetramethylene ether glycol with a number average molecular weight of 1800, diphenylmethane diisocyanate, ethylenediamine and diethylamine.

[0102] Example 2

[0103] The anti-translucent spandex comprises 95% by mass of polyurethane-urea and 5% by mass of a matting agent.

[0104] Matting agents include the following components:

[0105] Titanium dioxide 18%;

[0106] Silicon dioxide 10%;

[0107] Polypropylene glycol modified acrylate 62%;

[0108] Magnesium stearate 10%.

[0109] The polyurethane-urea comprises a reaction product of polytetramethylene ether glycol with a number average molecular weight of 1800, diphenylmethane diisocyanate, ethylenediamine and ethanolamine.

[0110] Example 3

[0111] The anti-transmittance spandex comprises 98% by mass of polyurethane-urea and 2% by mass of a matting agent.

[0112] Matting agents include the following components:

[0113] Titanium dioxide 18%;

[0114] Silicon dioxide 20%;

[0115] Polytetramethylene ether glycol modified acrylate 46%;

[0116] Hydrotalcite 16%.

[0117] The polyurethane-urea comprises a reaction product of polytetramethylene ether glycol with a number average molecular weight of 1800, diphenylmethane diisocyanate, butanediamine and diethylamine.

[0118] Example 4

[0119] The anti-translucent spandex comprises 97% by mass of polyurethane-urea and 3% by mass of a matting agent.

[0120] Matting agents include the following components:

[0121] Titanium dioxide 18%;

[0122] Silicon dioxide 15%;

[0123] Polytetramethylene ether glycol modified acrylate 52%;

[0124] Magnesium stearate 5%;

[0125] Hydrotalcite 10%.

[0126] The polyurethane-urea comprises a reaction product of polytetramethylene ether glycol with a number average molecular weight of 1800, diphenylmethane diisocyanate, ethylenediamine and diethylamine.

[0127] Example 5

[0128] The anti-transmittance spandex comprises 98% by mass of polyurethane-urea and 2% by mass of a matting agent.

[0129] Matting agents include the following components:

[0130] Titanium dioxide 18%;

[0131] Silicon dioxide 20%;

[0132] Polycarbonate modified acrylate 46%;

[0133] Hydrotalcite 16%.

[0134] The polyurethane-urea comprises a reaction product of polytetramethylene ether glycol with a number average molecular weight of 1800, diphenylmethane diisocyanate, ethylenediamine and butanediamine.

[0135] Example 6

[0136] The anti-translucent spandex comprises 99% by mass of polyurethane-urea and 1% by mass of a matting agent.

[0137] The difference between the matting agent and the matting agent in Example 1 is that the matting agent does not contain aluminum stearate, and the other parts remain unchanged.

[0138] The polyurethane-urea comprises a reaction product of polytetramethylene ether glycol with a number average molecular weight of 1800, diphenylmethane diisocyanate, ethylenediamine and diethylamine.

[0139] Example 7

[0140] The anti-translucent spandex comprises 99% by mass of polyurethane-urea and 1% by mass of a matting agent.

[0141] The difference between the matting agent and the matting agent in Example 1 is that the matting agent does not contain titanium dioxide, and the other aspects remain unchanged.

[0142] The polyurethane-urea comprises a reaction product of polytetramethylene ether glycol with a number average molecular weight of 1800, diphenylmethane diisocyanate, ethylenediamine and diethylamine.

[0143] Example 8

[0144] The anti-translucent spandex comprises 99% by mass of polyurethane-urea and 1% by mass of a matting agent.

[0145] The difference between the matting agent and the matting agent in Example 1 is that the matting agent does not contain silicon dioxide, and the other aspects remain unchanged.

[0146] The polyurethane-urea comprises a reaction product of polytetramethylene ether glycol with a number average molecular weight of 1800, diphenylmethane diisocyanate, ethylenediamine and diethylamine.

[0147] Example 9

[0148] The anti-translucent spandex comprises 99% by mass of polyurethane-urea and 1% by mass of a matting agent.

[0149] The difference between the matting agent and the matting agent in Example 1 is that the matting agent does not contain polyethylene glycol-modified acrylate, and the other parts remain unchanged.

[0150] The polyurethane-urea comprises a reaction product of polytetramethylene ether glycol with a number average molecular weight of 1800, diphenylmethane diisocyanate, ethylenediamine and diethylamine.

[0151] Example 10

[0152] The anti-translucent spandex comprises 95% by mass of polyurethane-urea and 5% by mass of a matting agent.

[0153] Matting agents include the following components:

[0154] Titanium dioxide 16.5%;

[0155] Silicon dioxide 8.5%;

[0156] Polypropylene glycol modified acrylate 60%;

[0157] Magnesium stearate 15%.

[0158] The polyurethane-urea comprises a reaction product of polytetramethylene ether glycol with a number average molecular weight of 1800, diphenylmethane diisocyanate, ethylenediamine and ethanolamine.

[0159] Embodiment 11

[0160] The anti-translucent spandex comprises 99% by mass of polyurethane-urea and 1% by mass of a matting agent.

[0161] Matting agents include the following components:

[0162] Titanium dioxide 10%;

[0163] Silicon dioxide 15%;

[0164] Polyethylene glycol modified acrylate 55%;

[0165] Aluminium stearate 20%.

[0166] The polyurethane-urea comprises a reaction product of polytetramethylene ether glycol with a number average molecular weight of 1800, diphenylmethane diisocyanate, diethylamine, ethylenediamine and 2,5-pyrazinediamine, wherein the molar ratio of ethylenediamine to 2,5-pyrazinediamine is 90:10.

[0167] Example 12

[0168] The anti-translucent spandex comprises 99% by mass of polyurethane-urea and 1% by mass of a matting agent.

[0169] Matting agents include the following components:

[0170] Titanium dioxide 10%;

[0171] Silicon dioxide 15%;

[0172] Polyethylene glycol modified acrylate 55%;

[0173] Aluminium stearate 20%.

[0174] The polyurethane-urea comprises a reaction product of polytetramethylene ether glycol with a number average molecular weight of 1800, diphenylmethane diisocyanate, diethylamine, ethylenediamine and 1,4-piperazinediethylamine, wherein the molar ratio of ethylenediamine to 1,4-piperazinediethylamine is 95:5.

[0175] Embodiment 13

[0176] The anti-translucent spandex comprises 99% by mass of polyurethane-urea and 1% by mass of a matting agent.

[0177] Matting agents include the following components:

[0178] Titanium dioxide 10%;

[0179] Silicon dioxide 15%;

[0180] Polyethylene glycol modified acrylate 55%;

[0181] Aluminium stearate 20%.

[0182] The polyurethane-urea comprises a reaction product of polytetramethylene ether glycol with a number average molecular weight of 1800, diphenylmethane diisocyanate, diethylamine, ethylenediamine and 2,3-diaminopiperazine, wherein the molar ratio of ethylenediamine to 2,3-diaminopiperazine is 75:25.

[0183] Comparative Example 1

[0184] Compared with Example 1, the anti-light transmission spandex does not contain a matting agent, and other aspects remain unchanged. (2) Preparation of anti-light transmission spandex:

[0185] The polyurethane-urea solutions of Examples 1 to 13 and the matting agent are mixed, stirred evenly and aged at 38° C. for 24 hours, and the aged spinning solution is transported to the spinning assembly, spinning tunnel, false twisting device, oiling agent, dried and formed by a winding machine to obtain anti-translucent spandex 1 to 13; wherein the spinneret holes in the spinning assembly of Examples 1 to 13 are circular.

[0186] In addition, the spinning solution of Example 1 is transported to the spinning assembly, spinning tunnel, false twisting device, oiling agent, drying, and formed by a winding machine to obtain anti-light transmission spandex 14, wherein the spinneret hole in the spinning assembly is cross-shaped.

[0187] The polyurethane-urea solution of comparative example 1 was stirred evenly and aged at 38° C. for 24 hours, and the aged spinning solution was transported to the spinning assembly, spinning tunnel, false twisting device, oiling agent, drying, and formed by a winding machine to obtain comparative spandex 1, wherein the spinneret hole was circular.

[0188] The prepared spandex was subjected to the following tests:

[0189] Breaking strength and breaking elongation: Tested in accordance with the method provided in the industry standard FZ / T 50006-2013 "Test method for tensile properties of spandex yarn".

[0190] Spandex is blended with nylon at a draft ratio of 2.5 times to obtain nylon-spandex fabric. After taking a sample larger than 5x5cm and shaping it, it is dyed with acid dyes. After dyeing, it is washed with clean water, dried and tested as follows:

[0191] Dyeability: Test the Kubelka-Munk dyeing depth of the fabric. The Kubelka-Munk dyeing depth equation establishes a certain functional relationship between the absorption coefficient K and scattering coefficient S of the object being tested, and the concentration C of the colored substance in the solid sample, which is generally between 0 and 1. The larger the K / S value obtained by calculation, the darker the color of the solid sample surface, that is, the higher the concentration of the colored substance, the better the dyeability, and vice versa.

[0192] Light transmittance: Tests the degree of light transmission through fabric, 0% to 100%; the higher the light transmittance, the easier it is for the fabric to transmit light, and the better the light transmission effect will be. On the contrary, the lower the light transmittance, the harder it is for light to pass through, and the lower the light penetration.

[0193] The test results of spandex 1-14 and nylon-spandex fabrics 1-14 and comparison spandex 1 and comparison nylon-spandex fabric 1 are as follows:

[0194]

[0195] Spandex 10*: Fiber forming and unwinding are poor, and the tow is slippery.

Claims

1. A light-proof spandex, characterized in that: The anti-light transmission spandex comprises polyurethane-urea and a matting agent, wherein the mass percentage of the matting agent in the anti-light transmission spandex is 0.5% to 5%; The matting agent comprises a mixture of titanium dioxide, silicon dioxide and acrylate.

2. The anti-translucent spandex according to claim 1, characterized in that: The matting agent includes the following mass components: Titanium dioxide 10-30%; Silicon dioxide 10-30%; Acrylate 40-80%.

3. The anti-translucent spandex according to claim 1, characterized in that: The matting agent also includes stearate and / or talc, with a mass composition of:

4. The anti-translucent spandex according to claim 3, characterized in that: The mass percentage of stearate in the anti-light transmission spandex calculated based on the total mass of the anti-light transmission spandex does not exceed 0.5%.

5. The anti-light transmission spandex according to claim 1, characterized in that: The polyurethane-urea comprises the reaction product of a polymer polyol, a polyisocyanate, a diamine chain extender and an amine chain terminator; The polymer polyol includes any one of polytetramethylene ether glycol, polyethylene glycol or polypropylene glycol, or a combination of at least two thereof; The polyisocyanate includes any one of diphenylmethane diisocyanate, toluene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate or dicyclohexylmethane diisocyanate, or a combination of at least two thereof; The diamine chain extender includes aliphatic diamine and non-aliphatic diamine; the molar ratio of the aliphatic diamine and the non-aliphatic diamine is 70:30 to 95:

5.

6. The anti-translucent spandex according to claim 5, characterized in that: The aliphatic diamine includes an aliphatic diamine having 2 to 30 carbon atoms, including any one or a combination of at least two of ethylenediamine, propylenediamine, butylenediamine, pentylenediamine, methylpentylenediamine, methylpropylenediamine, hexylenediamine, phenylenediamine, phenylenediamine, diaminocyclohexane or hexamethylenediamine; The non-aliphatic diamine includes nitrogen heterocyclic diamines, including any one or a combination of at least two of pyrazine diamine, piperazine diamine, and piperazine diethylamine, and further, including any one or a combination of at least two of 2,5-pyrazine diamine, 3,4-pyrazine diamine, 4,5-diaminopyrazine, 2,3-diaminopiperazine, and 1,4-piperazine diethylamine; The amine chain terminator includes a monoamine with a carbon number of 2 to 20, which is any one of diethylamine, isopropylamine, n-butylamine, tert-butylamine, hexylamine, diethylamine, dimethylamine, di-n-butylamine, di-tert-butylamine, diisobutylamine, diisopropylamine, diethylamine, dipropylamine, cyclohexylamine or ethanolamine, or a combination of at least two thereof.

7. The anti-translucent spandex according to claim 3, characterized in that: The stearate includes one or more of aluminum stearate, magnesium stearate, zinc stearate, calcium stearate, and barium stearate.

8. The anti-transmittance spandex according to claim 1, 2 or 3, characterized in that: The acrylate includes at least one of polyether-modified acrylate, polyester-modified acrylate and epoxy-modified acrylate.

9. The anti-light transmission spandex according to claim 8, characterized in that: The polyether-modified acrylate includes one or more of polyethylene glycol-modified acrylate, polypropylene glycol-modified acrylate, polyethylene glycol-propylene glycol-modified acrylate, and polytetramethylene ether glycol-modified acrylate; The polyester modified acrylate includes one or more of polycaprolactone modified acrylate, polycarbonate modified acrylate, and polyadipate modified acrylate; The epoxy modified acrylate includes one or more of bisphenol A epoxy acrylate, novolac epoxy acrylate, epoxidized acrylate and modified epoxy acrylate.

10. A method for preparing the light-proof spandex according to claim 1, 2, 3, 4 or 5, characterized in that: The preparation method is: Step 1. polymer polyol and polyisocyanate react to obtain a polyurethane prepolymer, and the obtained polyurethane prepolymer is dissolved in a solvent to obtain a polyurethane prepolymer solution; the mass percentage of isocyanate group NCO in the polyurethane prepolymer is 2.0% to 3.5%; Step 2. reacting the obtained polyurethane prepolymer solution, diamine chain extender and amine chain terminator to obtain a polyurethane-urea solution; the molar ratio of NCO in the polyurethane prepolymer to the amine group in the diamine chain extender and the amine chain terminator is 1:(1.01-1.10); Step 3. Mixing the polyurethane-urea solution and the matting agent as raw materials in proportion; Step 4. The polyurethane-urea solution is subjected to aging treatment before spinning, and the aging temperature is 30-45° C.; Step 5. Dry spinning, wherein the cross-sectional shape or arrangement of the spinneret holes on the spinneret plate in the spinneret assembly in the spraying step is adjusted, and the cross-sectional shape of the light-proof spandex includes at least one of a circular shape, a trilobal shape, and a cross shape; The anti-light transmission spandex is obtained.

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