Moisture-absorption quick-dry fiber and sunscreen fabric prepared from moisture-absorption quick-dry fiber

Abstract

The invention relates to the technical field of textile fabrics, in particular to a moisture-absorption quick-dry fiber and a sunscreen fabric prepared from the same. Thermoplastic polyurethane is prepared from raw materials including poly (1, 4-butylene adipate 1000), a waste polyester alcoholysis product bis (2-hydroxyethyl) terephthalate, a dihydroxyl functional aid and ethylene glycol modified titanium dioxide, and the dihydroxyl functional aid is prepared from melamine, maleic anhydride, 9, 10-dihydroxy-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1 The compound is prepared by taking 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and vanillin as raw materials and carrying out a reaction. Thermoplastic polyurethane and polyethylene glycol terephthalate are fused, parallel composite spinning is performed to obtain modified polyester, the modified polyester and spandex are wound and blended, and the moisture-absorption quick-dry fiber is obtained after finishing. The moisture-absorbing and quick-drying fibers are subjected to weaving, cutting and other processes, and the sunscreen fabric is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of textile fabrics, in particular to a moisture-absorbing quick-drying fiber and a sun-proof fabric prepared therefrom. Background Art

[0002] In the hot summer, the high temperature makes the human body sweat a lot. Clothing made of moisture-absorbing and quick-drying fabrics is popular among consumers because of its good breathability and quick perspiration. Polyester fiber is a synthetic fiber made by chemical polycondensation of organic dibasic acid and diol, commonly known as polyester. Because of its good wrinkle resistance, the clothing made of it is not easy to wrinkle when worn and can maintain the original shape of the clothing. It is widely used in the clothing field.

[0003] However, polyester has extremely poor moisture absorption properties, which causes high humidity and heat between the fabric and the human body. The clothes will stick tightly to the body, making the body feel extremely uncomfortable. In addition, polyester fibers are easy to burn, so it is very necessary to modify them. Summary of the invention

[0004] The object of the present invention is to provide a moisture-absorbing quick-drying fiber and a sun-proof fabric prepared therefrom, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solution: a moisture-absorbing quick-drying fiber and a sun-proof fabric prepared therefrom, comprising the following steps:

[0006] Step 1:

[0007] The waste polyester fabric is washed, dried and crushed to obtain recycled polyester fiber powder; the recycled polyester fiber powder and ethylene glycol are mixed, an alcoholysis catalyst is added, and alcoholysis is carried out at 185-190° C. for 4-5 hours; after separation by suction filtration, the filtrate is recrystallized at 3-4° C. for 24 hours, washed, filtered and dried to obtain the alcoholysis product dihydroxyethyl terephthalate;

[0008] Step 2:

[0009] S1: Disperse vanillin in anhydrous ethanol, heat to 40-50°C, add anhydrous potassium carbonate, stir for 10-15 minutes, add 2-bromoethanol, heat to 70-80°C, reflux for 40-48 hours, and obtain hydroxy-grafted vanillin;

[0010] S2: maleic anhydride and melamine are dispersed in 1,4-dioxane, and the temperature is raised to 85-90°C under nitrogen protection, and the mixture is refluxed and stirred for reaction for 2-3 hours. Then, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is added, and the temperature is raised to 95-100°C and refluxed for reaction for 6-8 hours. The temperature is lowered to 50-60°C, and hydroxy-grafted vanillin is added and the reaction is continued for 10-12 hours. 1,4-dioxane is removed by rotary evaporation, and the solid precipitate is washed with ethanol and vacuum dried to obtain a dihydroxy functional additive.

[0011] S3: Add tetrabutyl titanate to ethylene glycol, stir and disperse for 30 minutes, then add ultrapure water, then heat and reflux for 1 to 2 hours, and cool after the reaction is completed; add ethanol / ether mixed solution for precipitation, separate the precipitate, wash, dry and grind to obtain modified titanium dioxide powder;

[0012] S4: Mix poly(1,4-butylene adipate) 1000, dihydroxyethyl terephthalate, and dihydroxy functional additives, and vacuum dehydrate at 110-120° C. to obtain a mixed polyol; mix the mixed polyol, diphenylmethane-4,4'-diisocyanate, butanediol, ethanolamine, and modified titanium dioxide powder, and use dibutyltin dilaurate as a catalyst to melt-polymerize at 140-150° C. to obtain thermoplastic polyurethane; dry the thermoplastic polyurethane and polyethylene terephthalate slices, melt them, and perform side-by-side composite spinning to obtain modified polyester;

[0013] S5: Spandex and modified polyester are blended, immersed in a finishing solution, and dried to obtain a moisture-absorbing quick-drying fiber.

[0014] Furthermore, in step 1, the amount of each component is calculated by weight: 20 to 25 parts of recycled polyester fiber powder and 80 to 100 parts of ethylene glycol are mixed, and 0.8 to 1 part of alcoholysis catalyst is added; wherein the preparation method of the alcoholysis catalyst is: choline chloride and zinc acetate are mixed in a molar ratio of 1:1, and stirred in a water bath at 60°C for 4 to 5 hours.

[0015] Further, in S1, the molar ratio of vanillin to 2-bromoethanol is 1:1;

[0016] Furthermore, in S2, the molar ratio of maleic anhydride, melamine, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and hydroxy-grafted vanillin is 1:1:1:2.

[0017] Furthermore, in S3, the amount of each component, by weight, is 50 parts of ethylene glycol, 1 to 3 parts of tetrabutyl titanate, 30 to 35 parts of ultrapure water, and 40 to 50 parts of ethanol / ether mixed solution; wherein the ethanol / ether mixed solution is a mixture of ethanol and ether in a mass ratio of 4:5.

[0018] Furthermore, in S4, in the thermoplastic polyurethane, the amount of each component, by weight, is 300 to 350 parts of mixed polyols, 250 to 280 parts of diphenylmethane-4,4'-diisocyanate, 8 to 12 parts of butanediol, 5 to 7 parts of ethanolamine, and 2 to 3 parts of modified titanium dioxide powder; in the mixed polyol, the weight ratio of poly(1,4-butylene adipate)-1000, dihydroxyethyl terephthalate, and dihydroxy functional additive is 100:(90 to 95):(30 to 50).

[0019] Furthermore, in S4, the content of each component in the modified polyester is, by weight percentage, 40-50% of thermoplastic polyurethane and 50-60% of polyethylene terephthalate.

[0020] Furthermore, in S5, the moisture-absorbing quick-drying fiber comprises, by weight percentage, 75-80% of modified polyester and 25-30% of spandex.

[0021] Furthermore, the moisture-absorbing quick-drying fiber is stretched and rolled, and the rolled fiber is sent to a circulating steaming and spraying mechanism, and then woven and cut after rewinding and steaming to obtain a sun-proof fabric.

[0022] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention provides a method for preparing a moisture-absorbing and quick-drying fiber, wherein the present invention arranges a mixed yarn formed by entanglement of spandex and modified polyester to obtain a moisture-absorbing and quick-drying fiber. In the present invention, the modified polyester provides good elasticity for the fiber; the modified polyester is obtained by melting and side-by-side composite spinning of thermoplastic polyurethane and polyethylene terephthalate slices after drying. When preparing thermoplastic polyurethane, the present invention uses poly(1,4-butylene adipate) 1000, dihydroxyethyl terephthalate, and dihydroxy functional additives as raw materials, wherein dihydroxyethyl terephthalate is obtained by washing, drying, crushing, and alcoholysis of waste polyester fabrics, which, on the one hand, realizes the effective utilization of waste resources and reduces production costs; on the other hand, it also improves the compatibility between thermoplastic polyurethane and polyester. When preparing the dihydroxy functional additive, vanillin and 2-bromoethanol are first reacted to obtain hydroxy-grafted vanillin; then, using melamine as a raw material, melamine contains three amino groups, 1 equivalent of melamine, 1 equivalent of maleic anhydride and 1 equivalent of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide are reacted, and then the reaction is carried out with the hydroxy-grafted vanillin by Schiff base to obtain the dihydroxy functional additive; due to the presence of the dihydroxy functional additive, the modified polyester fiber is endowed with good antibacterial properties and flame retardant properties.

[0023] In addition, the present invention also modifies the titanium dioxide powder to improve its dispersibility in thermoplastic polyurethane. Titanium dioxide has a good shielding effect on ultraviolet rays, so after the moisture-absorbing and quick-drying fiber prepared by the present invention is processed into fabric, it can provide a sunscreen effect and prevent the ultraviolet rays in the sunlight from aging the fabric material and harming the human body. DETAILED DESCRIPTION

[0024] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0025] Materials and sources used in the present invention: polyethylene terephthalate slices come from Sanfangxiang, brand CZ-318; spandex comes from Hangzhou Qingyun New Materials Co., Ltd.

[0026] Embodiment 1: A moisture-absorbing quick-drying fiber and a sunscreen fabric prepared therefrom, comprising the following steps:

[0027] Step 1:

[0028] Choline chloride and zinc acetate were mixed in a molar ratio of 1:1, stirred in a water bath at 60°C for 4 hours to obtain an alcoholysis catalyst; waste polyester fabric was washed, dried and crushed to obtain recycled polyester fiber powder; 20g of recycled polyester fiber powder and 80g of ethylene glycol were mixed, 0.8g of alcoholysis catalyst was added, and alcoholysis was carried out at 185°C for 4 hours; after separation by suction filtration, the filtrate was recrystallized at 3°C ​​for 24 hours, washed, suction filtered and dried to obtain an alcoholysis product of dihydroxyethyl terephthalate;

[0029] Step 2:

[0030] S1: Disperse vanillin in anhydrous ethanol, heat to 40°C, add anhydrous potassium carbonate, stir for 10 minutes, add 2-bromoethanol, heat to 70°C and reflux for 40 hours to obtain hydroxy-grafted vanillin; wherein the molar ratio of vanillin to 2-bromoethanol is 1:1;

[0031] S2: maleic anhydride and melamine are dispersed in 1,4-dioxane, and the temperature is raised to 85°C, heated to reflux and stirred for 2 hours under nitrogen protection, and then 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is added, and the temperature is raised to 95°C for reflux reaction for 6 hours, and the temperature is lowered to 50°C, and hydroxy-grafted vanillin is added to continue the reaction for 10 hours, and 1,4-dioxane is removed by rotary evaporation, and the solid precipitate is washed with ethanol and vacuum dried to obtain a dihydroxy functional additive; wherein the molar ratio of maleic anhydride, melamine, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and hydroxy-grafted vanillin is 1:1:1:2;

[0032] S3: Add 3g of tetrabutyl titanate to 50g of ethylene glycol, stir and disperse for 30min, then add 30g of ultrapure water, then heat and reflux for 1h, and cool after the reaction is completed; add 45g of ethanol / ether mixed solution for precipitation, separate the precipitate, wash, dry and grind to obtain modified titanium dioxide powder; wherein, in the ethanol / ether mixed solution, ethanol and ether are mixed in a mass ratio of 4:5;

[0033] S4: 1000 poly (1,4-butylene adipate), dihydroxyethyl terephthalate and dihydroxy functional additives are mixed in a weight ratio of 100:95:30, and vacuum dehydrated at 110°C to obtain a mixed polyol; 330kg of the mixed polyol, 270kg of diphenylmethane-4,4'-diisocyanate, 10kg of butanediol, 6kg of ethanolamine and 2.5kg of modified titanium dioxide powder are mixed, and dibutyltin dilaurate is used as a catalyst to melt polymerize at 140°C to obtain thermoplastic polyurethane; thermoplastic polyurethane and polyethylene terephthalate slices are dried, melted and composite spun in parallel to obtain modified polyester; in the modified polyester, 50% of thermoplastic polyurethane and 50% of polyethylene terephthalate are calculated by weight percentage;

[0034] S5: 80% modified polyester and 20% spandex are blended by weight, immersed in a finishing solution, and dried to obtain a moisture-absorbing quick-drying fiber;

[0035] Step 2:

[0036] The moisture-absorbing quick-drying fiber is stretched and rolled, and the rolled fiber is sent to a circulating steaming and spraying mechanism. After rewinding and steaming and spraying, the fiber is woven and cut to obtain a sun-proof fabric.

[0037] Embodiment 2: A moisture-absorbing quick-drying fiber and a sunscreen fabric prepared therefrom, comprising the following steps:

[0038] Step 1:

[0039] Choline chloride and zinc acetate were mixed in a molar ratio of 1:1, stirred in a water bath at 60°C for 4.5 hours to obtain an alcoholysis catalyst; waste polyester fabric was washed, dried and crushed to obtain recycled polyester fiber powder; 20g of recycled polyester fiber powder and 80g of ethylene glycol were mixed, 0.8g of alcoholysis catalyst was added, and alcoholysis was carried out at 190°C for 4.5 hours; after separation by suction filtration, the filtrate was recrystallized at 3°C ​​for 24 hours, washed, suction filtered and dried to obtain an alcoholysis product of dihydroxyethyl terephthalate;

[0040] Step 2:

[0041] S1: Disperse vanillin in anhydrous ethanol, heat to 45°C, add anhydrous potassium carbonate, stir for 12 minutes, add 2-bromoethanol, heat to 75°C and reflux for 44 hours to obtain hydroxy-grafted vanillin; wherein the molar ratio of vanillin to 2-bromoethanol is 1:1;

[0042] S2: maleic anhydride and melamine are dispersed in 1,4-dioxane, and the temperature is raised to 88°C, heated to reflux and stirred for reaction for 2.5 hours under nitrogen protection, and then 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is added, and the temperature is raised to 98°C for reflux reaction for 7 hours, and the temperature is lowered to 55°C, and hydroxy-grafted vanillin is added to continue the reaction for 11 hours, and 1,4-dioxane is removed by rotary evaporation, and the solid precipitate is washed with ethanol and vacuum dried to obtain a dihydroxy functional additive; wherein the molar ratio of maleic anhydride, melamine, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and hydroxy-grafted vanillin is 1:1:1:2;

[0043] S3: Add 3g of tetrabutyl titanate to 50g of ethylene glycol, stir and disperse for 30min, then add 30g of ultrapure water, then heat and reflux for 1.5h, and cool after the reaction is completed; add 45g of ethanol / ether mixed solution for precipitation, separate the precipitate, wash, dry and grind to obtain modified titanium dioxide powder; wherein, in the ethanol / ether mixed solution, ethanol and ether are mixed in a mass ratio of 4:5;

[0044] S4: 1000 poly (1,4-butylene adipate), dihydroxyethyl terephthalate and dihydroxy functional additives are mixed in a weight ratio of 100:95:30, and vacuum dehydrated at 115°C to obtain a mixed polyol; 330kg of mixed polyol, 270kg of diphenylmethane-4,4'-diisocyanate, 10kg of butanediol, 6kg of ethanolamine and 2.5kg of modified titanium dioxide powder are mixed, and dibutyltin dilaurate is used as a catalyst to melt polymerize at 145°C to obtain thermoplastic polyurethane; thermoplastic polyurethane and polyethylene terephthalate slices are dried, melted and composite spun in parallel to obtain modified polyester; in the modified polyester, 50% of thermoplastic polyurethane and 50% of polyethylene terephthalate are calculated by weight percentage;

[0045] S5: 78% modified polyester and 22% spandex are blended by weight, immersed in a finishing solution, and dried to obtain a moisture-absorbing quick-drying fiber;

[0046] Step 2:

[0047] The moisture-absorbing quick-drying fiber is stretched and rolled, and the rolled fiber is sent to a circulating steaming and spraying mechanism. After rewinding and steaming and spraying, the fiber is woven and cut to obtain a sun-proof fabric.

[0048] Embodiment 3: A moisture-absorbing quick-drying fiber and a sunscreen fabric prepared therefrom, comprising the following steps:

[0049] Step 1:

[0050] Choline chloride and zinc acetate were mixed in a molar ratio of 1:1, stirred in a water bath at 60°C for 5 hours to obtain an alcoholysis catalyst; waste polyester fabric was washed, dried and crushed to obtain recycled polyester fiber powder; 20g of recycled polyester fiber powder and 80g of ethylene glycol were mixed, 0.8g of alcoholysis catalyst was added, and alcoholysis was carried out at 190°C for 5 hours; after separation by suction filtration, the filtrate was recrystallized at 4°C for 24 hours, washed, suction filtered and dried to obtain an alcoholysis product of dihydroxyethyl terephthalate;

[0051] Step 2:

[0052] S1: Disperse vanillin in anhydrous ethanol, heat to 50°C, add anhydrous potassium carbonate, stir for 13 minutes, add 2-bromoethanol, heat to 80°C and reflux for 48 hours to obtain hydroxy-grafted vanillin; wherein the molar ratio of vanillin to 2-bromoethanol is 1:1;

[0053] S2: maleic anhydride and melamine are dispersed in 1,4-dioxane, and the temperature is raised to 90°C under nitrogen protection, and the mixture is refluxed and stirred for reaction for 3 hours, and then 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is added, and the temperature is raised to 100°C for reflux reaction for 8 hours, and the temperature is lowered to 60°C, and hydroxy-grafted vanillin is added and the reaction is continued for 12 hours, and 1,4-dioxane is removed by rotary evaporation, and the solid precipitate is washed with ethanol, and vacuum dried to obtain a dihydroxy functional additive; wherein the molar ratio of maleic anhydride, melamine, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and hydroxy-grafted vanillin is 1:1:1:2;

[0054] S3: Add 3g of tetrabutyl titanate to 50g of ethylene glycol, stir and disperse for 30min, then add 30g of ultrapure water, then heat and reflux for 2h, and cool after the reaction is completed; add 45g of ethanol / ether mixed solution for precipitation, separate the precipitate, wash, dry and grind to obtain modified titanium dioxide powder; wherein, in the ethanol / ether mixed solution, ethanol and ether are mixed in a mass ratio of 4:5;

[0055] S4: 1000 poly (1,4-butylene adipate), dihydroxyethyl terephthalate and dihydroxy functional additives are mixed in a weight ratio of 100:95:30, and vacuum dehydrated at 120°C to obtain a mixed polyol; 330kg of the mixed polyol, 270kg of diphenylmethane-4,4'-diisocyanate, 10kg of butanediol, 6kg of ethanolamine and 2.5kg of modified titanium dioxide powder are mixed, and dibutyltin dilaurate is used as a catalyst to melt polymerize at 150°C to obtain thermoplastic polyurethane; thermoplastic polyurethane and polyethylene terephthalate slices are dried, melted and composite spun in parallel to obtain modified polyester; in the modified polyester, 50% of thermoplastic polyurethane and 50% of polyethylene terephthalate are calculated by weight percentage;

[0056] S5: 75% modified polyester and 25% spandex are blended by weight, immersed in a finishing liquid, and dried to obtain a moisture-absorbing quick-drying fiber;

[0057] Step 2:

[0058] The moisture-absorbing quick-drying fiber is stretched and rolled, and the rolled fiber is sent to a circulating steaming and spraying mechanism. After rewinding and steaming and spraying, the fiber is woven and cut to obtain a sun-proof fabric.

[0059] Comparative Example 1: The moisture-absorbing and quick-drying fiber was prepared without adding spandex, and the other parameters were the same as those in Example 1.

[0060] Step 1:

[0061] S1: Disperse vanillin in anhydrous ethanol, heat to 40°C, add anhydrous potassium carbonate, stir for 10 minutes, add 2-bromoethanol, heat to 70°C and reflux for 40 hours to obtain hydroxy-grafted vanillin; wherein the molar ratio of vanillin to 2-bromoethanol is 1:1;

[0062] S2: maleic anhydride and melamine are dispersed in 1,4-dioxane, and the temperature is raised to 85°C, heated to reflux and stirred for 2 hours under nitrogen protection, and then 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is added, and the temperature is raised to 95°C for reflux reaction for 6 hours, and the temperature is lowered to 50°C, and hydroxy-grafted vanillin is added to continue the reaction for 10 hours, and 1,4-dioxane is removed by rotary evaporation, and the solid precipitate is washed with ethanol and vacuum dried to obtain a dihydroxy functional additive; wherein the molar ratio of maleic anhydride, melamine, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and hydroxy-grafted vanillin is 1:1:1:2;

[0063] S3: Add 3g of tetrabutyl titanate to 50g of ethylene glycol, stir and disperse for 30min, then add 30g of ultrapure water, then heat and reflux for 1h, and cool after the reaction is completed; add 45g of ethanol / ether mixed solution for precipitation, separate the precipitate, wash, dry and grind to obtain modified titanium dioxide powder; wherein, in the ethanol / ether mixed solution, ethanol and ether are mixed in a mass ratio of 4:5;

[0064] S4: 1000 poly(1,4-butylene adipate) and a dihydroxy functional additive are mixed in a weight ratio of 100:30, and vacuum dehydrated at 110°C to obtain a mixed polyol; 330kg of the mixed polyol, 270kg of diphenylmethane-4,4'-diisocyanate, 10kg of butanediol, 6kg of ethanolamine, and 2.5kg of modified titanium dioxide powder are mixed, and dibutyltin dilaurate is used as a catalyst to melt polymerize at 140°C to obtain thermoplastic polyurethane; thermoplastic polyurethane and polyethylene terephthalate slices are dried, melted, and composite spun in parallel to obtain modified polyester; in the modified polyester, by weight percentage, 50% of thermoplastic polyurethane and 50% of polyethylene terephthalate;

[0065] Step 2:

[0066] The modified polyester is stretched and rolled, and the rolled fibers are sent to a circulating steam-spraying mechanism. After rewinding and steam-spraying, the fibers are woven and cut to obtain sun-protective fabrics.

[0067] Comparative Example 2: No dihydroxy functional additive was added, and the other parameters were the same as those in Example 2.

[0068] Step 1:

[0069] Choline chloride and zinc acetate were mixed in a molar ratio of 1:1, stirred in a water bath at 60°C for 4.5 hours to obtain an alcoholysis catalyst; waste polyester fabric was washed, dried and crushed to obtain recycled polyester fiber powder; 20g of recycled polyester fiber powder and 80g of ethylene glycol were mixed, 0.8g of alcoholysis catalyst was added, and alcoholysis was carried out at 190°C for 4.5 hours; after separation by suction filtration, the filtrate was recrystallized at 3°C ​​for 24 hours, washed, suction filtered and dried to obtain an alcoholysis product of dihydroxyethyl terephthalate;

[0070] Step 2:

[0071] S1: Add 3g of tetrabutyl titanate to 50g of ethylene glycol, stir and disperse for 30min, then add 30g of ultrapure water, then heat and reflux for 1.5h, and cool after the reaction is completed; add 45g of ethanol / ether mixed solution for precipitation, separate the precipitate, wash, dry and grind to obtain modified titanium dioxide powder; wherein, in the ethanol / ether mixed solution, ethanol and ether are mixed in a mass ratio of 4:5;

[0072] S2: 1000 kg of poly(1,4-butylene adipate) and dihydroxyethyl terephthalate are vacuum dehydrated at 115°C in a weight ratio of 100:95 to obtain a mixed polyol; 330 kg of the mixed polyol, 270 kg of diphenylmethane-4,4'-diisocyanate, 10 kg of butanediol, 6 kg of ethanolamine, and 2.5 kg of modified titanium dioxide powder are mixed, and dibutyltin dilaurate is used as a catalyst to melt polymerize at 145°C to obtain thermoplastic polyurethane; thermoplastic polyurethane and polyethylene terephthalate slices are dried, melted, and composite spun in parallel to obtain modified polyester; in the modified polyester, 50% of thermoplastic polyurethane and 50% of polyethylene terephthalate are calculated by weight percentage;

[0073] S3: 78% modified polyester and 22% spandex are blended by weight, immersed in a finishing liquid, and dried to obtain a moisture-absorbing quick-drying fiber;

[0074] Step 2:

[0075] The moisture-absorbing quick-drying fiber is stretched and rolled, and the rolled fiber is sent to a circulating steaming and spraying mechanism. After rewinding and steaming and spraying, the fiber is woven and cut to obtain a sun-proof fabric.

[0076] Comparative Example 3: No modified titanium dioxide powder was added, and the other parameters were the same as those in Example 3.

[0077] Step 1:

[0078] Choline chloride and zinc acetate were mixed in a molar ratio of 1:1, stirred in a water bath at 60°C for 5 hours to obtain an alcoholysis catalyst; waste polyester fabric was washed, dried and crushed to obtain recycled polyester fiber powder; 20g of recycled polyester fiber powder and 80g of ethylene glycol were mixed, 0.8g of alcoholysis catalyst was added, and alcoholysis was carried out at 190°C for 5 hours; after separation by suction filtration, the filtrate was recrystallized at 4°C for 24 hours, washed, suction filtered and dried to obtain an alcoholysis product of dihydroxyethyl terephthalate;

[0079] Step 2:

[0080] S1: Disperse vanillin in anhydrous ethanol, heat to 50°C, add anhydrous potassium carbonate, stir for 13 minutes, add 2-bromoethanol, heat to 80°C and reflux for 48 hours to obtain hydroxy-grafted vanillin; wherein the molar ratio of vanillin to 2-bromoethanol is 1:1;

[0081] S2: maleic anhydride and melamine are dispersed in 1,4-dioxane, and the temperature is raised to 90°C under nitrogen protection, and the mixture is refluxed and stirred for reaction for 3 hours, and then 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is added, and the temperature is raised to 100°C for reflux reaction for 8 hours, and the temperature is lowered to 60°C, and hydroxy-grafted vanillin is added and the reaction is continued for 12 hours, and 1,4-dioxane is removed by rotary evaporation, and the solid precipitate is washed with ethanol, and vacuum dried to obtain a dihydroxy functional additive; wherein the molar ratio of maleic anhydride, melamine, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and hydroxy-grafted vanillin is 1:1:1:2;

[0082] S3: 1000 poly (1,4-butylene adipate), dihydroxyethyl terephthalate and dihydroxy functional additives are mixed in a weight ratio of 100:95:30, and vacuum dehydrated at 120°C to obtain a mixed polyol; 330kg of mixed polyol, 270kg of diphenylmethane-4,4'-diisocyanate, 10kg of butanediol, 6kg of ethanolamine and 2.5kg of modified titanium dioxide powder are mixed, and dibutyltin dilaurate is used as a catalyst to melt polymerize at 150°C to obtain thermoplastic polyurethane; thermoplastic polyurethane and polyethylene terephthalate slices are dried, melted and composite spun in parallel to obtain modified polyester; in the modified polyester, 50% of thermoplastic polyurethane and 50% of polyethylene terephthalate are calculated by weight percentage;

[0083] S5: 75% modified polyester and 25% spandex are blended by weight, immersed in a finishing liquid, and dried to obtain a moisture-absorbing quick-drying fiber;

[0084] Step 2:

[0085] The moisture-absorbing quick-drying fiber is stretched and rolled, and the rolled fiber is sent to a circulating steaming and spraying mechanism. After rewinding and steaming and spraying, the fiber is woven and cut to obtain a sun-proof fabric.

[0086] Experiment: The performance of the sunscreen fabrics in Examples 1 to 3 and Comparative Examples 1 to 3 was tested. In the fabrics, the linear density of the warp yarn was 30 tex, and the linear density of the weft yarn was 20 tex; the warp density of the fabric was 100 strands / inch, and the weft density was 70 strands / inch.

[0087] Flame retardant performance test: tested using the limiting oxygen index.

[0088] Antibacterial property: refer to standard GB / T 20944.2-2007 "Evaluation of antibacterial properties of textiles Part 2: Absorption method", first melt the freeze-dried bacteria and disperse them in 5mL culture medium, culture at 37℃ for 24h, then use an inoculation loop to take the Escherichia coli solution and streak it on the culture dish and culture it for 24h, then take a bacterium from the culture dish and inoculate it into a test tube and culture it for 24h, then measure the concentration of the bacterial solution, use a pipette to take 0.1mL of the bacterial solution and dilute it three times, then spread it on the plate and culture it for 24h, use 20mL of culture medium to elute the bacteria on the cloth, then take 0.1mL of it and dilute it on the plate, and count and calculate the inhibition rate after 24h of culture, and the blank control group is the bacterial solution without adding sample.

[0089] Moisture absorption and quick-drying performance: Refer to standard GB / T 21655.1-2008, and consider the evaporation rate of the fabric.

[0090] Sun protection performance: GB / T18830-2009 "Evaluation method for UV protection of textiles" standard, test index is T (UVA) AV 、T(UVB) AV , UPF, if the textile UPF> 40, T (UVA) AV If the content of UV rays is less than 5%, it can be called an “anti-UV product”, and its sun protection performance is recorded as “qualified”, otherwise it is “unqualified”.

[0091] The experimental results are shown in Table 1.

[0092] Table 1. Test results of various properties of sun-proof fabrics made of moisture-absorbing and quick-drying fibers

[0093] project Limiting oxygen index Antibacterial rate Evaporation rate / gh-1 Sun protection performance Example 1 28.2％ 94％ 0.33 qualified Example 2 27.5％ 92％ 0.31 qualified Example 3 27.3％ 91％ 0.28 qualified Comparative Example 1 28.8％ 95％ 0.23 qualified Comparative Example 2 20.5％ 58％ 0.31 qualified Comparative Example 3 27.1％ 91％ 0.28 Failure

[0094] Conclusion: The data of Examples 1 to 3 show that the sunscreen fabric prepared by the moisture-absorbing quick-drying fiber prepared by the present invention has good performance. The data of Example 1 and Comparative Example 1 show that after blending spandex and modified polyester, the moisture absorption performance of the fabric is improved; the data of Example 2 and Comparative Example 2 show that after adding the dihydroxy functional additive, the antibacterial and flame retardant properties of the fabric are improved. The data of Example 3 and Comparative Example 3 show that adding modified titanium dioxide powder can improve the anti-ultraviolet performance of the fabric.

[0095] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a moisture-absorbing quick-drying fiber, characterized in that: The following steps are involved: Step 1: Washing, drying and crushing the waste polyester fabric to obtain recycled polyester fiber powder; The recycled polyester fiber powder and ethylene glycol are mixed, an alcoholysis catalyst is added, and alcoholysis is carried out at 185-190°C for 4-5 hours; after separation by suction filtration, the filtrate is recrystallized at 3-4°C for 24 hours, washed, filtered, and dried to obtain the alcoholysis product dihydroxyethyl terephthalate; Step 2: S1: Disperse vanillin in anhydrous ethanol, heat to 40-50°C, add anhydrous potassium carbonate, stir for 10-15 minutes, add 2-bromoethanol, heat to 70-80°C, reflux for 40-48 hours, and obtain hydroxy-grafted vanillin; S2: maleic anhydride and melamine are dispersed in 1,4-dioxane, and the temperature is raised to 85-90°C under nitrogen protection, and the mixture is refluxed and stirred for reaction for 2-3 hours. Then, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is added, and the temperature is raised to 95-100°C and refluxed for reaction for 6-8 hours. The temperature is lowered to 50-60°C, and hydroxy-grafted vanillin is added and the reaction is continued for 10-12 hours. 1,4-dioxane is removed by rotary evaporation, and the solid precipitate is washed with ethanol and vacuum dried to obtain a dihydroxy functional additive. S3: Add tetrabutyl titanate to ethylene glycol, stir and disperse for 30 minutes, then add ultrapure water, then heat and reflux for 1 to 2 hours, and cool after the reaction is completed; adding an ethanol / ether mixed solution for precipitation, separating the precipitate, washing, drying, and grinding it to obtain modified titanium dioxide powder; S4: Mix poly(1,4-butylene adipate) 1000, dihydroxyethyl terephthalate, and dihydroxy functional additives, and vacuum dehydrate at 110-120° C. to obtain a mixed polyol; mix the mixed polyol, diphenylmethane-4,4'-diisocyanate, butanediol, ethanolamine, and modified titanium dioxide powder, and use dibutyltin dilaurate as a catalyst to melt-polymerize at 140-150° C. to obtain thermoplastic polyurethane; dry the thermoplastic polyurethane and polyethylene terephthalate slices, melt them, and perform side-by-side composite spinning to obtain modified polyester; S5: Spandex and modified polyester are blended, immersed in a finishing solution, and dried to obtain a moisture-absorbing quick-drying fiber.

2. The method for preparing a moisture-absorbing and quick-drying fiber according to claim 1, characterized in that: In step 1, the amount of each component is calculated by weight: 20 to 25 parts of recycled polyester fiber powder and 80 to 100 parts of ethylene glycol are mixed, and 0.8 to 1 part of alcoholysis catalyst is added; wherein the alcoholysis catalyst is prepared by mixing choline chloride and zinc acetate in a molar ratio of 1:1, and stirring in a water bath at 60°C for 4 to 5 hours.

3. The method for preparing a moisture-absorbing and quick-drying fiber according to claim 1, characterized in that: In S1, the molar ratio of vanillin to 2-bromoethanol is 1:

1.

4. The method for preparing a moisture-absorbing and quick-drying fiber according to claim 1, characterized in that: In S2, the molar ratio of maleic anhydride, melamine, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and hydroxy-grafted vanillin is 1:1:1:

2.

5. The method for preparing a moisture-absorbing and quick-drying fiber according to claim 1, characterized in that: In S3, the amount of each component, by weight, is 50 parts of ethylene glycol, 1 to 3 parts of tetrabutyl titanate, 30 to 35 parts of ultrapure water, and 40 to 50 parts of ethanol / ether mixed solution; wherein the ethanol / ether mixed solution is obtained by mixing ethanol and ether in a mass ratio of 4:

5.

6. The method for preparing a moisture-absorbing and quick-drying fiber according to claim 1, characterized in that: In S4, in the thermoplastic polyurethane, the amount of each component, by weight, is 300-350 parts of mixed polyols, 250-280 parts of diphenylmethane-4,4'-diisocyanate, 8-12 parts of butanediol, 5-7 parts of ethanolamine, and 2-3 parts of modified titanium dioxide powder; in the mixed polyol, the weight ratio of poly(1,4-butylene adipate) 1000, dihydroxyethyl terephthalate, and dihydroxy functional additive is 100:(90-95):(30-50).

7. The method for preparing a moisture-absorbing and quick-drying fiber according to claim 1, characterized in that: In S4, the content of each component in the modified polyester is, by weight percentage, 40-50% of thermoplastic polyurethane and 50-60% of polyethylene terephthalate.

8. The method for preparing a moisture-absorbing and quick-drying fiber according to claim 1, characterized in that: In S5, the moisture-absorbing and quick-drying fiber contains, by weight percentage, 75-80% modified polyester and 25-30% spandex.

9. The moisture-absorbing and quick-drying fiber prepared by the preparation method according to any one of claims 1 to 8.

10. A method for preparing sunscreen fabrics using the moisture-absorbing and quick-drying fiber according to claim 9, characterized in that: The moisture-absorbing quick-drying fiber is stretched and rolled, and the rolled fiber is sent to a circulating steaming and spraying mechanism. After rewinding and steaming and spraying, the fiber is woven and cut to obtain a sun-proof fabric.