Preparation method of soft high-elasticity composite underwear fabric

Abstract

The invention relates to a preparation method of a soft high-elasticity composite underwear fabric, and belongs to the technical field of underwear fabrics. The method comprises the following steps: putting a fabric into deionized water, adding a softening agent and a penetrant, and carrying out one-time dipping and one-time rolling; after padding finishing, dehydrating, drying, baking and cooling to room temperature to obtain the soft high-elasticity composite underwear fabric. The softening agent prepared by the invention can obviously improve the softness of the fabric, so that the fabric feels soft, smooth and comfortable.

Description

Technical Field

[0001] The invention relates to the technical field of underwear fabrics, in particular to a method for preparing soft and highly elastic composite underwear fabrics. Background Art

[0002] Most underwear fabrics are made of natural fiber fabrics, chemical fiber fabrics, and blended fabrics. Natural fibers are textile fibers directly obtained from plants that are native to nature or cultivated artificially, or from animals raised artificially, mainly including cotton, wool, silk, and linen; chemical fibers refer to fibers made from natural or synthetic polymers and processed by chemical and mechanical methods, including regenerated fibers (regenerated protein fibers and regenerated cellulose fibers) and synthetic fibers; blended fabrics: blended fabrics are woven from two or more fibers blended into yarns, and generally have good moisture absorption and breathability, especially after printing and dyeing, the appearance is more fashionable and bright, which can not only reflect the advantages of various fibers in the raw materials, but also improve the clothing performance of the fabric. Blended fabrics are widely used in underwear fabrics.

[0003] Chinese patent CN118166542A: relates to the field of fabric processing technology, in particular to a preparation process for an old, highly elastic and soft air layer fabric, comprising the following preparation steps: S1, blending viscose fiber, polyester fiber and spandex, and then weaving to obtain an air layer grey cloth; S2, placing the air layer grey cloth in a bulking agent solution, soaking for 4-6 hours at a temperature of 40-50°C, taking it out, washing it, and drying it to obtain a puffed air layer grey cloth; S3, placing the puffed air layer grey cloth in a sand washing machine, processing it for 1-1.5 hours at a temperature of 50-55°C, taking it out, washing it, and drying it to obtain a sand-washed air layer grey cloth, wherein a sand washing liquid is added to the sand washing machine; S4, soaking the sand-washed air layer grey cloth in a softening liquid for 2-3 hours to obtain an old, highly elastic and soft air layer fabric.

[0004] Chinese Patent CN113862884A: Provides a method for preparing a soft and highly elastic blended cotton fabric

[0005] The method comprises the following steps: (1) simultaneously feeding spandex and cotton-acrylic blended yarn into a weft knitting machine for weaving to obtain a fabric grey cloth, wherein the cotton-acrylic blended yarn comprises the following components by mass fraction: 48-52% long-staple cotton fiber and 48-52% acrylic fiber; and the spandex comprises 8-12% by mass of the fabric grey cloth, and the remainder comprises long-staple cotton fiber and acrylic fiber; and (2) refining the woven fabric grey cloth at 55-70° C. for 60-80 min, dehydrating the fabric to a moisture content of 15-35%, and then finishing the fabric in an open-width drying and setting machine until the fabric is completely dried, the drying temperature being 150-185° C. and the machine speed being 15-18 m / min, to obtain a blended cotton fabric.

[0006] Chinese patent CN117802790B: It relates to the field of fabric technology and discloses a soft and highly elastic nylon-spandex composite fabric, a preparation method thereof and its application in underwear. The preparation method comprises: mixing an aqueous solution of 3-chloro-2-hydroxypropanesulfonic acid sodium with an amino silicone oil to undergo a quaternization reaction to obtain a modified silicone softener; mixing polytetrahydrofuran ether diol, 4,4'-diphenylmethane diisocyanate, a modified silicone softener and ethylenediamine to undergo a dry spinning process to obtain a modified spandex filament; obtaining a nylon-spandex coated yarn based on the modified spandex filament, knitting the nylon-spandex coated yarn to obtain a surface fabric and an inner fabric; compounding the surface fabric with the inner fabric to obtain a composite fabric; mixing a modified silicone oil having a mercapto group with a modified polyamide, silver nitrate and water to obtain a finishing solution, impregnating the composite fabric with the finishing solution, and irradiating the composite fabric to obtain a soft and highly elastic nylon-spandex composite fabric.

[0007] The underwear fabrics prepared by the above patents and prior art have poor hydrophilicity, poor softness, poor elasticity and poor comfort. Summary of the invention

[0008] In order to solve the above problems, the present invention provides a method for preparing a soft and highly elastic composite underwear fabric, and the operating steps are as follows:

[0009] S1: Put 10-20 parts of fabric into 200-300 parts of deionized water, add 0.1-1 parts of softener and 0.1-0.5 parts of penetrant, and soak and roll;

[0010] S2: After padding and finishing, the mixture is dehydrated, dried, baked, and cooled to room temperature to obtain a soft and highly elastic composite underwear fabric.

[0011] The fabric is a nylon / spandex composite fabric or a Sorona / cotton high-elastic blended knitted fabric.

[0012] The preparation method of the softener is:

[0013] H1: Weigh 30-40 parts of polyether silicone oil, 3-7 parts of sodium hydroxide, and 12-16 parts of methyl-(3-isocyanatepropyl)dimethylsilane by weight, put them into a reaction kettle, stir and heat to 65-75°C, and keep warm for 40-60 minutes; then drop 45-60 parts of octamethylcyclotetrasiloxane within 30 minutes, continue to react for 40-60 minutes, and cool to room temperature; obtain polyether / isocyanatepropyl silicone oil;

[0014] H2: By weight, 80-100 parts of polyether / isocyanate propyl silicone oil, 2-5 parts of L-menthol, 0.02-0.2 parts of 2,5-dihydroxy-1,4-dithiane, 10-15 parts of methyl allyl alcohol polyoxyethylene ether, and 0.5-2 parts of stannous octoate are stirred and mixed, and the mixture is kept at 60-70°C for 100-140 minutes. 450-500 parts of water and 3-6 parts of glacial acetic acid are added in portions, and the mixture is stirred to obtain a softener.

[0015] The viscosity (CS) of the polyether silicone oil is 360-480.

[0016] The penetrant is one of penetrant JFC-1, penetrant JFC-2, penetrant JFC-E, penetrant JFC-M and penetrant JFC-EP.

[0017] The immersion temperature of the immersion is 30-40° C., and the time is 10-30 minutes.

[0018] The rolling margin of the first rolling is 60-70%.

[0019] The drying temperature is 80-100° C. and the drying time is 3-6 minutes.

[0020] The baking temperature is 170-180° C. and the baking time is 15-30 seconds.

[0021] Reaction mechanism

[0022] Reaction of isocyanate with hydroxyl: The isocyanate group (-NCO) reacts with the hydroxyl group (-OH) to form a carbamate bond (-NHCOO-); during this process, the carbon atom of the isocyanate is positively charged due to the electron-withdrawing effect of oxygen and nitrogen, and is easily attacked by the nucleophilic oxygen in the hydroxyl group to form a stable carbamate structure.

[0023] Technical Effects

[0024] The present invention discloses a method for preparing a soft and highly elastic composite underwear fabric. Compared with the prior art, the present invention has the following significant effects:

[0025] 1. The soft and highly elastic composite underwear fabric prepared by the present invention has regularity in directional arrangement on the fiber: Siloxane has unique surface active properties and can form a uniform film on the fiber surface, which significantly improves the softness and smoothness of the fiber; the regular arrangement of siloxane molecules on the fiber surface is achieved through the interaction between the silicon oxygen bond (Si-O) in its molecular structure and the chemical bond on the fiber surface. The carbamate structure formed by the above chemical reaction can effectively "lock" the relative position between the fibers and prevent damage caused by excessive friction during movement, which is similar to the role of plasticizers, but focuses more on maintaining the softness and natural elasticity of the fiber;

[0026] Improved hand feel: Polyether-modified silicone oil can effectively fill the tiny defects on the smooth fiber surface and reduce the surface roughness, thereby improving the hand feel of the fabric on a microscopic scale; at the same time, due to the water-based and oily feel of silicone oil itself, the treated fabric is not only soft but also smooth, greatly enhancing the comfort experience when wearing;

[0027] L-Menthol has a unique cool feeling and fresh smell. Its deposition on the fabric can give the fabric an extra sense of comfort and freshness, making the wearer feel more pleasant during use.

[0028] Methyl allyl alcohol polyoxyethylene ether helps to evenly distribute silicone oil in water, ensuring that silicone oil can evenly coat each fiber during the treatment process, thereby ensuring the consistency of quality and overall softness of the treated fabric;

[0029] 2. The soft and highly elastic composite underwear fabric prepared by the present invention has a high tensile elastic recovery rate and excellent high elasticity;

[0030] 3. The softener prepared by the present invention can increase the polarity of the molecule by introducing the thioane structure, and improve its ability to be oriented on the fiber surface, so that the siloxane is arranged more regularly on the fiber, and the softness and regularity of the fabric are enhanced; it can promote the regularity of the oriented arrangement of the siloxane on the fiber, help the fiber to restore its original shape, and improve the softness of the fabric, making the fabric feel soft, smooth and comfortable. DETAILED DESCRIPTION

[0031] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description in combination with embodiments and comparative examples:

[0032] 1. Hydrophilicity: Refer to AATCC Test Method 79-2000 to measure the time required for the fabric to absorb 1 drop of water under static conditions;

[0033] 2. Rigidity and flexibility: Tested with reference to the inclined plane method, the bending length and bending stiffness are used to characterize the rigidity and flexibility of the fabric;

[0034] 3. Tensile elastic recovery rate: refer to FZ70006-2004 for testing.

[0035] Example 1

[0036] A method for preparing a soft and highly elastic composite underwear fabric, the operating steps of which are:

[0037] S1: Put 10g of fabric into 200g of deionized water, add 0.1g of softener and 0.1g of penetrant, and soak and roll;

[0038] S2: After padding and finishing, the mixture is dehydrated, dried, baked, and cooled to room temperature to obtain a soft and highly elastic composite underwear fabric.

[0039] The fabric is a nylon / spandex composite fabric.

[0040] The preparation method of the softener is:

[0041] H1: Weigh 30g of polyether silicone oil, 3g of sodium hydroxide, and 12g of methyl-(3-isocyanatepropyl)dimethylsilane, put them into a reaction kettle, stir and heat to 65°C, and keep warm for 40min; then drop 45g of octamethylcyclotetrasiloxane within 30min, continue to react for 40min, and cool to room temperature; obtain polyether / isocyanatepropyl silicone oil;

[0042] H2: 80 g of polyether / isocyanate propyl silicone oil, 2 g of L-menthol, 0.02 g of 2,5-dihydroxy-1,4-dithiane, 10 g of methyl allyl alcohol polyoxyethylene ether, and 0.5 g of stannous octoate were stirred and mixed, and the mixture was kept at 60°C for 100 min. 450 g of water and 3 g of glacial acetic acid were added in portions and stirred to obtain a softener.

[0043] The viscosity (CS) of the polyether silicone oil is 360.

[0044] The penetrant is JFC-1.

[0045] The immersion temperature of the first immersion is 30° C. and the time is 10 minutes.

[0046] The rolling margin of the first rolling is 60%.

[0047] The drying temperature is 80° C. and the drying time is 3 minutes.

[0048] The baking temperature is 170° C. and the baking time is 15 seconds.

[0049] Example 2

[0050] A method for preparing a soft and highly elastic composite underwear fabric, the operating steps of which are:

[0051] S1: Put 13g of fabric into 240g of deionized water, add 0.5g of softener and 0.2g of penetrant, and soak and roll;

[0052] S2: After padding and finishing, the mixture is dehydrated, dried, baked, and cooled to room temperature to obtain a soft and highly elastic composite underwear fabric.

[0053] The fabric is a nylon / spandex composite fabric.

[0054] The preparation method of the softener is:

[0055] H1: Weigh 33g of polyether silicone oil, 4g of sodium hydroxide, and 13g of methyl-(3-isocyanatepropyl)dimethylsilane, put them into a reaction kettle, stir and heat to 68°C, and keep warm for 45 minutes; then drop 50g of octamethylcyclotetrasiloxane within 30 minutes, continue to react for 45 minutes, and cool to room temperature; obtain polyether / isocyanatepropyl silicone oil;

[0056] H2: 85 g of polyether / isocyanate propyl silicone oil, 3 g of L-menthol, 0.1 g of 2,5-dihydroxy-1,4-dithiane, 12 g of methyl allyl alcohol polyoxyethylene ether, and 1 g of stannous octoate were stirred and mixed, and the mixture was kept at 65°C for 110 min. 460 g of water and 4 g of glacial acetic acid were added in portions and stirred to obtain a softener.

[0057] The viscosity (CS) of the polyether silicone oil is 400.

[0058] The penetrant is JFC-2.

[0059] The immersion temperature of the first immersion is 35° C. and the time is 15 minutes.

[0060] The rolling margin of the first rolling is 65%.

[0061] The drying temperature is 85° C. and the drying time is 4 minutes.

[0062] The baking temperature is 175° C. and the baking time is 20 seconds.

[0063] Example 3

[0064] A method for preparing a soft and highly elastic composite underwear fabric, the operating steps of which are:

[0065] S1: Put 18g of fabric into 280g of deionized water, add 0.8g of softener and 0.4g of penetrant, and soak and roll;

[0066] S2: After padding and finishing, the mixture is dehydrated, dried, baked, and cooled to room temperature to obtain a soft and highly elastic composite underwear fabric.

[0067] The fabric is a Sorona / cotton high-elastic blended knitted fabric.

[0068] The preparation method of the softener is:

[0069] H1: Weigh 38g of polyether silicone oil, 6g of sodium hydroxide, and 15g of methyl-(3-isocyanatepropyl)dimethylsilane, put them into a reaction kettle, stir and heat to 73°C, and keep warm for 55 minutes; then drop 55g of octamethylcyclotetrasiloxane within 30 minutes, continue to react for 55 minutes, and cool to room temperature; obtain polyether / isocyanatepropyl silicone oil;

[0070] H2: 95 g of polyether / isocyanate propyl silicone oil, 4 g of L-menthol, 0.15 g of 2,5-dihydroxy-1,4-dithiane, 14 g of methyl allyl alcohol polyoxyethylene ether, and 1.5 g of stannous octoate were stirred and mixed, and the mixture was kept at 65°C for 130 min. 480 g of water and 5 g of glacial acetic acid were added in portions, and the mixture was stirred to obtain a softener.

[0071] The viscosity (CS) of the polyether silicone oil is 440.

[0072] The penetrant is penetrant JFC-E.

[0073] The immersion temperature of the first immersion is 35° C. and the time is 25 minutes.

[0074] The rolling margin of the first rolling is 65%.

[0075] The drying temperature is 95° C. and the drying time is 5 minutes.

[0076] The baking temperature is 175° C. and the baking time is 25 seconds.

[0077] Example 4

[0078] A method for preparing a soft and highly elastic composite underwear fabric, the operating steps of which are:

[0079] S1: Put 20g of fabric into 300g of deionized water, add 1g of softener, 0.5g

[0080] Penetrant, one dip and one roll;

[0081] S2: After padding and finishing, the mixture is dehydrated, dried, baked, and cooled to room temperature to obtain a soft and highly elastic composite underwear fabric.

[0082] The fabric is a Sorona / cotton high-elastic blended knitted fabric.

[0083] The preparation method of the softener is:

[0084] H1: Weigh 40g of polyether silicone oil, 7g of sodium hydroxide, and 16g of methyl-(3-isocyanatepropyl)dimethylsilane, put them into a reaction kettle, stir and heat to 75°C, and keep warm for 60min; then drop 60g of octamethylcyclotetrasiloxane within 30min, continue to react for 60min, and cool to room temperature to obtain polyether / isocyanatepropyl silicone oil;

[0085] H2: 100 g of polyether / isocyanate propyl silicone oil, 5 g of L-menthol, 0.2 g of 2,5-dihydroxy-1,4-dithiane, 15 g of methyl allyl alcohol polyoxyethylene ether, and 2 g of stannous octoate were stirred and mixed, and the mixture was kept at 70°C for 140 min. 500 g of water and 6 g of glacial acetic acid were added in portions and stirred to obtain a softener.

[0086] The viscosity (CS) of the polyether silicone oil is 480.

[0087] The penetrant is the penetrant JFC-EP.

[0088] The immersion temperature of the first immersion is 40° C. and the time is 30 minutes.

[0089] The rolling margin of the first rolling is 70%.

[0090] The drying temperature is 100° C. and the drying time is 6 minutes.

[0091] The baking temperature is 180° C. and the baking time is 30 seconds.

[0092] Comparative Example 1

[0093] No softener was added, and the rest was the same as in Example 1.

[0094] Comparative Example 2

[0095] The polyether / isocyanate propyl silicone oil was not added, and the other steps were the same as in Example 1.

[0096] Comparative Example 3

[0097] Without adding L-menthol, the other steps were the same as in Example 1.

[0098] The test results are shown in the following table:

[0099]

[0100]

[0101] Through the data analysis of the above embodiments and comparative examples, the soft and high-elastic composite underwear fabric prepared by the present invention has a high tensile elastic recovery rate and feels soft, smooth and comfortable.

[0102] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a soft and highly elastic composite underwear fabric, the operating steps of which are: S1: Put 10-20 parts of fabric into 200-300 parts of deionized water, add 0.1-1 parts of softener and 0.1-0.5 parts of penetrant, and soak and roll; S2: After padding and finishing, the mixture is dehydrated, dried, baked, and cooled to room temperature to obtain a soft and highly elastic composite underwear fabric.

2. The method for preparing a soft and highly elastic composite underwear fabric according to claim 1, characterized in that: The fabric is a nylon / spandex composite fabric or a Sorona / cotton high-elastic blended knitted fabric.

3. The method for preparing a soft and highly elastic composite underwear fabric according to claim 1, characterized in that: The preparation method of the softener of S1 is: H1: Weigh 30-40 parts of polyether silicone oil, 3-7 parts of sodium hydroxide, and 12-16 parts of methyl-(3-isocyanatepropyl)dimethylsilane by weight, put them into a reaction kettle, stir and heat to 65-75°C, and keep warm for 40-60 minutes; then drop 45-60 parts of octamethylcyclotetrasiloxane within 30 minutes, continue to react for 40-60 minutes, and cool to room temperature to obtain polyether / isocyanatepropyl silicone oil; H2: By weight, 80-100 parts of polyether / isocyanate propyl silicone oil, 2-5 parts of L-menthol, 0.02-0.2 parts of 2,5-dihydroxy-1,4-dithiane, 10-15 parts of methyl allyl alcohol polyoxyethylene ether, and 0.5-2 parts of stannous octoate are stirred and mixed, and the mixture is kept at 60-70°C for 100-140 minutes. 450-500 parts of water and 3-6 parts of glacial acetic acid are added in portions, and the mixture is stirred to obtain a softener.

4. The method for preparing a soft and highly elastic composite underwear fabric according to claim 2, characterized in that: The viscosity (CS) of the polyether silicone oil of H1 is 360-480.

5. The method for preparing a soft and highly elastic composite underwear fabric according to claim 1, characterized in that: The penetrant of S1 is one of penetrant JFC-1, penetrant JFC-2, penetrant JFC-E, penetrant JFC-M, and penetrant JFC-EP.

6. The method for preparing a soft and highly elastic composite underwear fabric according to claim 1, characterized in that: The immersion temperature of the S1 is 30-40° C. and the time is 10-30 min.

7. The method for preparing a soft and highly elastic composite underwear fabric according to claim 1, characterized in that: The rolling margin of the S1 is 60-70%.

8. The method for preparing a soft and highly elastic composite underwear fabric according to claim 1, characterized in that: The drying temperature is 80-100° C. and the drying time is 3-6 minutes.

9. The method for preparing a soft and highly elastic composite underwear fabric according to claim 1, characterized in that: The baking temperature is 170-180° C. and the baking time is 15-30 seconds.

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