Moisture wicking knitted fabric and production process thereof

Abstract

The invention discloses a moisture wicking knitted fabric and a production process thereof, and belongs to the field of knitting. 60-70 parts of ethylene-octene copolymer, 15-25 parts of polypropylene resin, 10-20 parts of silicone rubber, 2-5 parts of auxiliary agents, and 0.2-0.6 parts of cross-linking agents are mixed and sent into a twin-screw extruder for extrusion and pelletization, and then melt-spun, cooled, rolled, and irradiated to obtain elastic fibers; the elastic fibers are blended with cotton fibers and modal fibers to obtain knitted fabrics. There is a chemical reaction between the auxiliary agents of the invention and polypropylene, so the auxiliary agents can stably exist in the elastic fibers, give full play to their role, and give the knitted fabrics excellent and stable anti-aging, antibacterial and antistatic properties; the knitted fabrics obtained by blending cotton fibers with good air permeability, modal fibers with strong moisture wicking and elastic fibers not only have excellent moisture wicking and elasticity, but also can effectively inhibit bacterial growth, and also have stable and lasting anti-aging and antistatic properties.

Description

Technical Field

[0001] The invention belongs to the field of knitting, and in particular relates to a moisture absorbing and perspiration wicking knitted fabric and a production process thereof. Background Art

[0002] With the rapid development of China's economy and the continuous improvement of people's living standards, people who love fashion feel depressed by the busyness and competition of the city. They don't want the clothes they wear every day to restrain them, so while maintaining appropriate clothing, they also have higher and higher requirements for the moisture absorption and perspiration performance, anti-static and anti-aging properties of clothing.

[0003] In addition, knitted fabrics in the prior art are prone to breed bacteria after absorbing sweat. Substances produced by the massive bacterial proliferation and metabolism, such as Staphylococcus, aerobic Corynebacterium and Bacillus, will convert the odorless secretions of the human body into volatile odor products. Ammonia is a product of bacterial decomposition of substances and is the main component of sweat odor. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a moisture wicking knitted fabric and a production process thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A production process for a moisture wicking knitted fabric comprises the following steps:

[0007] (1) Weighing 60-70 parts of ethylene-octene copolymer, 15-25 parts of polypropylene resin, 10-20 parts of silicone rubber, 2-5 parts of auxiliary agent, and 0.2-0.6 parts of cross-linking agent by weight, mixing them evenly, feeding them into a twin-screw extruder for extrusion and pelletizing, and then feeding them into a hopper of a melt spinning machine for melt spinning, cooling, and winding, and finally irradiating them at a radiation dose of 150-200 kGy to prepare elastic fibers;

[0008] (2) Blending, weaving and shaping the cotton fiber, modal fiber and the elastic fiber obtained in step (1) to obtain a moisture wicking knitted fabric.

[0009] Furthermore, the silicone rubber in step (1) is vinyl polydimethylsiloxane.

[0010] Furthermore, the auxiliary agent in step (1) is prepared by the following steps:

[0011] S1, nitrogen was blown into a dry round-bottom flask to expel air and moisture in the flask, and then 2-aminobenzothiazole, triethylamine and chloroform were added, and the mixture of chloroacetyl chloride and chloroform was slowly added in an ice-water bath after stirring. After the addition was completed, the mixture was continued to react for 30 minutes in an ice-water bath. After the reaction was completed, the mixture was desolvated under reduced pressure to obtain intermediate 1; the amount ratio of 2-aminobenzothiazole, chloroacetyl chloride, triethylamine and chloroform was 15g:8.6mL:14mL:120mL;

[0012] Under the condition of ice water bath, triethylamine is used as an acid binding agent, and the molar ratio of 2-aminobenzothiazole and chloroacetyl chloride is controlled to be 1:1.05-1.1, then -NH2 of 2-aminobenzothiazole and the acyl chloride of chloroacetyl chloride undergo amidation reaction, and the reaction process is as follows:

[0013]

[0014] S2. Replace the air and moisture in the dry three-necked flask with nitrogen, then add intermediate 1, pyridine and DMSO (dimethyl sulfoxide), stir and dissolve, then heat to 60°C, slowly add 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionyl hydrazide, continue to stir and react at 60°C for 5h after the addition is complete, cool to room temperature after the reaction is completed, and distill under reduced pressure to obtain intermediate 2; the usage ratio of intermediate 1, 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionyl hydrazide, pyridine and DMSO is 20.4g:28.6g:8.7mL:120mL;

[0015] Pyridine is used as an acid-binding agent, and the molar ratio of intermediate 1 and 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl hydrazide is controlled to be 1:1.05-1.1, then intermediate 1 and 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl hydrazide undergo a nucleophilic substitution reaction, and the reaction process is as follows:

[0016]

[0017] S3, nitrogen was blown into a dry brown round-bottom flask to expel air and moisture from the flask, then glycidyl methacrylate and DMSO were added, stirred to dissolve, and then the temperature was raised to 65°C, and then the intermediate 2 dissolved in DMSO was slowly added to the above flask, and the stirring reaction was continued for 3 hours. After the reaction was completed, it was distilled under reduced pressure, purified by column chromatography (the eluent was a mixed solvent of cyclohexane and ethyl acetate, and the volume ratio of cyclohexane and ethyl acetate was 1:1), and then distilled under reduced pressure to obtain intermediate 3; the usage ratio of intermediate 2, glycidyl methacrylate and DMSO was 41.4g:9.9mL:180mL;

[0018] The molar ratio of intermediate 2 to glycidyl methacrylate is controlled to be 1.1-1.15:1, then the non-amide -NH- on intermediate 2 reacts with the epoxy group of glycidyl methacrylate, and the reaction process is as follows:

[0019]

[0020] S4. Replace the air and moisture in the dry three-necked flask with nitrogen, then add intermediate 3, triethylamine and DMF (N,N-dimethylformamide), stir to dissolve and then heat to 80°C, then slowly add tetradecyl chloride dissolved in DMF, continue to stir and react at 80°C for 4h after the addition is complete, cool to room temperature after the reaction is completed, and distill under reduced pressure to obtain an auxiliary agent; the usage ratio of intermediate 3, tetradecyl chloride, triethylamine and DMF is 37.5g:18.5mL:9.5mL:180mL.

[0021] Under the conditions of heating and the presence of triethylamine, the molar ratio of intermediate 3 to tetradecyl chloride is controlled to be 1:1.1-1.2, and the tertiary amine group of intermediate 3 and -Cl of tetradecyl chloride undergo a nucleophilic substitution reaction. The reaction process is as follows:

[0022]

[0023] The auxiliary agent of the present invention contains a hindered phenol structure. The hindered phenol structure prevents the subsequent free radical chain reaction by capturing the free radicals generated when the organic matter decomposes, thereby avoiding the degradation and yellowing of the organic molecules. Under the action of heat, light and oxygen, the organic molecules will generate active free radicals, which will trigger a series of free radical chain reactions, causing the physical and chemical properties of the organic matter to change. The hindered phenol structure stops the chain reaction by capturing these free radicals, thereby protecting the knitted fabric of the present invention from degradation and aging.

[0024] The amide, heterocycle and quaternary ammonium salt structures in the auxiliary agent have good antibacterial activity, and the synergistic effect of the long side chain (14 carbons) of the quaternary ammonium salt makes the auxiliary agent of the present invention have good antibacterial effect, and the knitted fabric added with the auxiliary agent is not easy to breed bacteria and mold, and is not easy to produce odor. In addition, the quaternary ammonium part in the quaternary ammonium salt structure is a hydrophilic group with a positive charge, which can interact with moisture (strong polar molecules) in the air to form a conductive continuous film. This film gives the surface of the knitted fabric a certain hygroscopicity and ionicity, thereby reducing the surface resistivity and allowing the generated static charge to leak quickly. The hydrophobic group (long carbon chain) of the quaternary ammonium salt provides lubricity and reduces the friction coefficient, thereby inhibiting and reducing the generation of static charge. This dual action mechanism makes the quaternary ammonium salt structure have a good antistatic effect.

[0025] The end of the additive contains a methacrylate group, which can react chemically with the unreacted carbon-carbon double bonds at the end of the polypropylene under the action of the cross-linking agent, so that the additive can be firmly present in the elastic fiber and give full play to the antibacterial, anti-aging and antistatic effects.

[0026] In the presence of a crosslinking agent and under irradiation conditions, the elastic fiber molecules of the present invention generate covalent crosslinking points to form a three-dimensional network structure, which increases the elastic recovery performance of the elastic fiber and avoids the generation of additional residual shrinkage force, thereby obtaining an elastic fiber with good elasticity. The knitted fabric obtained by blending and weaving the elastic fiber with cotton fiber and modal fiber has excellent elasticity and a wider range of applications.

[0027] Furthermore, in the step (1), the cross-linking agent is prepared by mixing benzoyl peroxide and triallyl isocyanurate in a mass ratio of 1:(3-7).

[0028] Furthermore, the mass ratio of the cotton fiber, modal fiber and elastic fiber in step (2) is (5-7):(5-7):(7-9).

[0029] Cotton fiber has high strength and good air permeability; the raw material of modal fiber comes from natural wood, which can be naturally degraded after use. Modal fiber has strong moisture absorption capacity and fast moisture absorption rate. The knitted fabric made by blending it with cotton fiber and elastic fiber can remain dry and breathable for a long time, and is more comfortable to wear.

[0030] The invention also discloses a moisture absorbing and perspiration wicking knitted fabric, which is produced according to the production process of the moisture absorbing and perspiration wicking knitted fabric.

[0031] The invention has the beneficial effects that the auxiliary agent of the invention contains a hindered phenol structure, a quaternary ammonium salt structure, and an amide group and a heterocycle with antibacterial activity, and there is a chemical reaction between the auxiliary agent and polypropylene, so the auxiliary agent can stably exist in the elastic fiber and fully play its role, thereby giving the elastic fiber and the knitted fabric excellent and stable anti-aging, antibacterial and antistatic properties; the knitted fabric obtained by blending the cotton fiber with good air permeability, the modal fiber with strong moisture absorption and perspiration wicking ability and the elastic fiber of the invention not only has excellent moisture absorption and perspiration wicking ability and elasticity, but also can effectively inhibit bacterial growth, is not easy to produce odor, and also has stable and lasting anti-aging and antistatic properties. DETAILED DESCRIPTION

[0032] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1: Preparation of auxiliary agent, the specific steps are as follows:

[0034] S1. Purge a 250 mL dry round-bottom flask with nitrogen to expel air and moisture from the flask, then add 15 g of 2-aminobenzothiazole, 14 mL of triethylamine and 110 mL of chloroform, stir evenly, and slowly add a mixed solution of 8.6 mL of chloroacetyl chloride and 10 mL of chloroform in an ice-water bath. After the addition is complete, continue to react in an ice-water bath for 30 min. After the reaction is completed, desolventize and obtain intermediate 1.

[0035] S2, replace the air and moisture in a 250mL dry three-necked flask with nitrogen, then add 20.4g of intermediate 1, 8.7mL of pyridine and 120mL of DMSO, stir and dissolve, then heat to 60°C, then slowly add 28.6g of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionylhydrazide, continue to stir and react at 60°C for 5h after the addition is complete, cool to room temperature after the reaction is completed, and distill under reduced pressure to obtain intermediate 2;

[0036] S3, nitrogen was blown into a 500 mL dry brown round-bottom flask to expel air and moisture from the flask, and then 9.9 mL of glycidyl methacrylate and 100 mL of DMSO were added, stirred to dissolve, and then the temperature was raised to 65°C, and then 41.4 g of intermediate 2 dissolved in 80 mL of DMSO was slowly added to the above flask, and the stirring reaction was continued for 3 h. After the reaction was completed, it was distilled under reduced pressure, purified by column chromatography (a mixed solvent of cyclohexane and ethyl acetate was selected as the eluent, and the volume ratio of cyclohexane and ethyl acetate was 1:1), and then distilled under reduced pressure to obtain intermediate 3;

[0037] S4. Replace the air and moisture in a 500mL dry three-necked flask with nitrogen, then add 37.5g of intermediate 3, 9.5mL of triethylamine and 160DMF, stir and dissolve, then heat to 80°C, then slowly add 18.5mL of tetradecyl chloride dissolved in 20mL DMF, continue stirring and react at 80°C for 4h after the addition is complete, cool to room temperature after the reaction is completed, and distill under reduced pressure to obtain an auxiliary agent.

[0038] Example 2: Preparation of a moisture wicking knitted fabric, the specific steps are as follows:

[0039] (1) 60 parts of ethylene-octene copolymer, 15 parts of polypropylene resin, 10 parts of vinyl polydimethylsiloxane, 2 parts of the additive prepared in Example 1, 0.05 parts of benzoyl peroxide and 0.15 parts of triallyl isocyanurate were weighed by weight, mixed evenly, and then fed into a twin-screw extruder for extrusion and pelletization, and then fed into a hopper of a melt spinning machine for melt spinning, cooling, and winding, and finally irradiated at an irradiation dose of 150 kGy to prepare elastic fibers;

[0040] (2) blending cotton fiber, modal fiber and the elastic fiber obtained in step (1) (the mass ratio of cotton fiber, modal fiber and elastic fiber is 5:7:7), weaving and shaping to obtain a moisture wicking knitted fabric.

[0041] Example 3: Preparation of a moisture wicking knitted fabric, the specific steps are as follows:

[0042] (1) 65 parts of ethylene-octene copolymer, 20 parts of polypropylene resin, 15 parts of vinyl polydimethylsiloxane, 4 parts of the additive prepared in Example 1, 0.08 parts of benzoyl peroxide and 0.32 parts of triallyl isocyanurate were weighed by weight, mixed evenly, and then fed into a twin-screw extruder for extrusion and pelletization, and then fed into a hopper of a melt spinning machine for melt spinning, cooling, and winding, and finally irradiated at an irradiation dose of 180 kGy to prepare elastic fibers;

[0043] (2) blending cotton fiber, modal fiber and the elastic fiber obtained in step (1) (the mass ratio of cotton fiber, modal fiber and elastic fiber is 7:5:9), weaving and shaping to obtain a moisture wicking knitted fabric.

[0044] Example 4: Preparation of a moisture wicking knitted fabric, the specific steps are as follows:

[0045] (1) 70 parts of ethylene-octene copolymer, 25 parts of polypropylene resin, 20 parts of vinyl polydimethylsiloxane, 5 parts of the additive prepared in Example 1, 0.075 parts of benzoyl peroxide and 0.525 parts of triallyl isocyanurate were weighed by weight, mixed evenly, and then fed into a twin-screw extruder for extrusion and pelletization, and then fed into a hopper of a melt spinning machine for melt spinning, cooling, and winding, and finally irradiated at a radiation dose of 200 kGy to prepare elastic fibers;

[0046] (2) blending cotton fiber, modal fiber and the elastic fiber obtained in step (1) (the mass ratio of cotton fiber, modal fiber and elastic fiber is 6:6:8), weaving and shaping to obtain a moisture wicking knitted fabric.

[0047] Comparative Example 1:

[0048] Preparation of knitted fabric, the specific steps are as follows:

[0049] The remaining steps remain unchanged, only the auxiliary agent in Example 2 is removed to prepare the knitted fabric.

[0050] Comparative Example 2:

[0051] Preparation of knitted fabric, the specific steps are as follows:

[0052] The remaining steps remained unchanged, except that the auxiliary agent in Example 2 was replaced by 1 part of antioxidant 1076 and 1 part of antibacterial agent ZW30 produced by Nanjing Tianshi Landun Biotechnology Co., Ltd. to prepare a knitted fabric.

[0053] Performance Test:

[0054] (1) Antibacterial property test: According to GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles Part 3: Oscillation method", the knitted fabrics of Examples 2-4 and Comparative Examples 1-2 were tested for antibacterial properties (bacterial species: Escherichia coli ATCC25922, Staphylococcus aureus ATCC6538, Candida albicans ATCC10231). The test results are shown in Table 1 below.

[0055] Table 1 Antibacterial test results of knitted fabrics of Examples 2-4 and Comparative Examples 1-2:

[0056]

[0057] (2) Antistatic performance test: The charge surface density of the knitted fabrics of Examples 2-4 and Comparative Examples 1-2 was measured in accordance with GB / T 12703.1-2008 “Evaluation of electrostatic properties of textiles” to test the antistatic performance (the smaller the charge surface density, the better the antistatic performance). The test results are shown in Table 2 below.

[0058] Table 2 Test results of antistatic properties of knitted fabrics of Examples 2-4 and Comparative Examples 1-2:

[0059]

[0060] (3) Breaking strength test and aging resistance test: The elastic fibers of step (1) of Examples 2-4 and Comparative Examples 1-2 were made into 5 cm × 20 cm specimens to test the breaking strength of the specimens, and then dry-heat aged at 105°C for 120 h. The breaking strength was then tested under the same conditions. The test results are shown in Table 3 below.

[0061] Table 3 Test results of breaking strength of knitted fabrics of Examples 2-4 and Comparative Examples 1-2:

[0062]

[0063] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0064] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A production process for moisture wicking knitted fabric, characterized in that: The following steps are involved: (1) Weighing 60-70 parts of ethylene-octene copolymer, 15-25 parts of polypropylene resin, 10-20 parts of silicone rubber, 2-5 parts of additives, and 0.2-0.6 parts of crosslinking agent by weight, mixing, extruding and pelletizing, and then melt spinning, cooling, winding, and irradiating at a radiation dose of 150-200 kGy to obtain elastic fiber; (2) blending, weaving and shaping the cotton fiber, modal fiber and the elastic fiber obtained in step (1) to obtain a moisture wicking knitted fabric; Wherein, the auxiliary agent in step (1) is prepared by the following steps: S1, after nitrogen blowing into the flask, add 2-aminobenzothiazole, triethylamine and chloroform, stir, add chloroacetyl chloride and chloroform in an ice-water bath, react for 30 minutes, and remove the solvent under reduced pressure to obtain intermediate 1; S2, after replacing the air and moisture in the bottle with nitrogen, add intermediate 1, pyridine and DMSO, stir and heat to 60°C, add 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionylhydrazide, react for 5h, cool, and distill under reduced pressure to obtain intermediate 2; S3, after nitrogen blowing into the flask, add glycidyl methacrylate and DMSO, stir and heat to 65°C, then add intermediate 2 dissolved in DMSO, react for 3h, distill under reduced pressure, purify by column chromatography, and distill under reduced pressure to obtain intermediate 3; S4, after replacing the air and moisture in the bottle with nitrogen, add intermediate 3, triethylamine and DMF, stir and heat to 80°C, add tetradecyl chloride dissolved in DMF, react for 4h, and distill under reduced pressure to obtain an auxiliary agent; The usage ratio of 2-aminobenzothiazole, chloroacetyl chloride, triethylamine and chloroform in step S1 is 15 g:8.6 mL:14 mL:120 mL; The usage ratio of intermediate 1 in step S2, 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoylhydrazide, pyridine and DMSO is 20.4 g:28.6 g:8.7 mL:120 mL; The usage ratio of intermediate 2, glycidyl methacrylate and DMSO in step S3 is 41.4 g:9.9 mL:180 mL; The usage ratio of intermediate 3, tetradecane chloride, triethylamine and DMF in step S4 is 37.5 g:18.5 mL:9.5 mL:180 mL; In step (1), the crosslinking agent is prepared by mixing benzoyl peroxide and triallyl isocyanurate in a mass ratio of 1:(3-7); The mass ratio of cotton fiber, modal fiber and elastic fiber in step (2) is (5-7):(5-7):(7-9).

2. The production process of a moisture wicking knitted fabric according to claim 1, characterized in that: The silicone rubber in step (1) is vinyl polydimethylsiloxane.

3. A moisture wicking knitted fabric, characterized in that: The fabric is produced according to the production process of a moisture wicking knitted fabric as described in any one of claims 1-2.

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