Environment-friendly breathable polyester silk fabric and preparation process thereof

Abstract

The invention relates to the technical field of fabric preparation, in particular to environment-friendly breathable polyester silk fabric and a preparation process thereof. The preparation method comprises the following steps: preparing an epoxy polyurethane emulsion by taking glycidyl as an end-capping reagent; eugenol and phenyl dichlorophosphate are used as raw materials to react, and m-chloroperoxybenzoic acid is used as an oxidizing agent to prepare an epoxy flame retardant; the preparation method comprises the following steps: carrying out reaction on N, N-diethylaminopropyl methyl dimethoxy silane and epoxy chloropropane to obtain epoxy organosilicon quaternary ammonium salt; mixing the epoxy-based polyurethane emulsion, the epoxy-based flame retardant, the epoxy-based organosilicon quaternary ammonium salt and the curing agent, and modifying the polyester silk; preparing bio-based spinning fibers from a mixed solution of a carboxymethyl cellulose solution and a chitosan solution through an electrostatic spinning technology, and then blending the bio-based spinning fibers with the modified polyester to obtain the polyester fabric. The polyester silk fabric prepared by the method has good flame retardant property, antibacterial property and air permeability, and part of materials are renewable materials, so that the polyester silk fabric is economical and environment-friendly and meets the requirement of green development.

Description

Technical Field

[0001] The invention relates to the technical field of fabric preparation, in particular to an environmentally friendly breathable polyester fabric and a preparation process thereof. Background Art

[0002] Polyester, also known as polyester filament, is a synthetic fiber. It is a synthetic fiber made from organic dibasic acids and diols through chemical polycondensation, and belongs to the category of high molecular synthetic compounds. Polyester has many advantages, such as high strength, elastic recovery and chemical resistance. Clothes made of polyester fabrics are strong and durable, and can quickly recover to their original shape. They show excellent wrinkle resistance and shape retention during wearing, are not easy to wrinkle, and can maintain the original shape of the clothes. In addition, polyester fabrics also have the characteristics of wear resistance and non-stickiness, making the fabric look neater.

[0003] However, polyester has poor air permeability, is flammable, and is very easy to breed bacteria, which in turn causes diseases and affects people's health. In view of the above problems, it is very necessary to provide a preparation process for environmentally friendly breathable polyester fabrics. Summary of the invention

[0004] The object of the present invention is to provide an environmentally friendly breathable polyester fabric and a preparation process thereof to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an environmentally friendly breathable polyester fabric and a preparation process thereof:

[0006] Step 1:

[0007] The epoxy polyurethane emulsion, epoxy flame retardant, epoxy organosilicon quaternary ammonium salt and curing agent are mixed to obtain a modifier; after washing and drying the polyester yarn, the polyester yarn is immersed in the modifier at a bath ratio of 1:(15-20) for 60-90 minutes, and after taking out, the polyester yarn is vacuum dried at 80-90° C. for 3-5 hours to obtain a modified polyester yarn;

[0008] Step 2:

[0009] The carboxymethyl cellulose powder is dissolved in deionized water to obtain a carboxymethyl cellulose solution with a mass concentration of 10-15%; the chitosan powder is dissolved in an acetic acid solution with a volume concentration of 2-3% to obtain a chitosan solution with a mass fraction of 2-3%; the carboxymethyl cellulose solution and the chitosan solution are mixed at a volume ratio of (3-5):1, 1-3% of glycerol of the total mass of the mixed solution is added, and the mixture is mixed in an oil bath at 110-120°C to obtain a spinning solution; the spinning solution is electrostatically spun to obtain a bio-based spinning fiber; and the bio-based spinning fiber and a modified polyester fiber are blended to obtain a finished product.

[0010] Furthermore, in the modifier, the contents of each component, by weight, are 100 parts of epoxy polyurethane emulsion, 5 to 8 parts of epoxy flame retardant, 10 to 14 parts of epoxy organosilicon quaternary ammonium salt, and 20 to 24 parts of curing agent.

[0011] Furthermore, the preparation method of the epoxy polyurethane emulsion is as follows: 35 to 50 parts of isophorone diisocyanate and 100 parts of polyethylene glycol 1000 are mixed by weight, dibutyltin dilaurate is used as a catalyst, and the mixture is reacted at 50 to 60° C. for 1 to 2 hours, and then 6 to 8 parts of dihydroxymethylpropionic acid are added to react for 0.5 to 1 hour, and then 5 to 7 parts of 1,4-butanediol are added to react for 1 to 2 hours to obtain an isocyanate-terminated polyurethane prepolymer; glycidol is added at a molar ratio of isocyanate group to hydroxyl group of 1:1 to react for 1 to 2 hours, and after cooling, 9 to 13 parts of triethylamine are added to neutralize the mixture, and deionized water is added to emulsify the mixture to obtain an epoxy polyurethane emulsion with a solid content of 30 to 40%.

[0012] Furthermore, the preparation method of the epoxy flame retardant comprises the following steps:

[0013] S1: Disperse eugenol in ethyl acetate, use triethylamine as an acid-binding agent, cool in an ice bath until the system temperature is stable, add phenyl dichlorophosphate, stir at 20-30°C for 24h, and finally separate, wash and rotary evaporate the product to obtain dieugenol phenyl phosphate;

[0014] S2: Disperse dieugenol phenyl phosphate in ethyl acetate, add m-chloroperbenzoic acid at 40-50° C. with stirring and react for 48-52 hours; after the reaction, separate the reaction product, wash, rotary evaporate, cool and recrystallize, and dry to obtain an epoxy flame retardant.

[0015] Further, in S1, eugenol and phenyl dichloride phosphate are reacted in a molar ratio of 2:1.

[0016] Further, in S2, dieugenol phenyl phosphate and meta-chloroperbenzoic acid are reacted in a molar ratio of 1:2.

[0017] Furthermore, the preparation method of epoxy organosilicon quaternary ammonium salt is as follows: in a nitrogen environment, N,N-diethylaminopropylmethyldimethoxysilane is dispersed in anhydrous methanol, the temperature is raised to 55-65°C, a mixed solution of epichlorohydrin and anhydrous methanol is added, and after the addition is completed, the reaction is kept warm for 6-10 hours, the anhydrous methanol is removed by rotary evaporation and eluted with anhydrous ether, and the epoxy organosilicon quaternary ammonium salt is obtained.

[0018] Further, N,N-diethylaminopropylmethyldimethoxysilane is reacted with epichlorohydrin in a molar ratio of 1:1.

[0019] Furthermore, the environmentally friendly breathable polyester fabric contains 15-20% bio-based spinning fibers and 80-85% modified polyester blended fibers by weight.

[0020] Compared with the prior art, the beneficial effects achieved by the present invention are: the polyester fabric prepared by the present invention has good flame retardant properties, antibacterial properties and breathable properties, and some of the materials are renewable and environmentally friendly materials, which can not only reduce the preparation cost but also meet the needs of green development.

[0021] The present invention uses a modifier to modify polyester yarn. The main components of the modifier are: using glycidol as a capping agent to cap the polyurethane prepolymer to obtain an epoxy polyurethane emulsion; reacting eugenol with dichlorophenyl phosphate to obtain dieugenol phenyl phosphate, and then using m-chloroperbenzoic acid as an oxidant to epoxidize the double bonds at both ends to obtain an epoxy flame retardant; using N,N-diethylaminopropylmethyldimethoxysilane and epichlorohydrin as raw materials to react to obtain an epoxy organosilicon quaternary ammonium salt. The main components all contain epoxy groups, and under the action of an amine curing agent, a film layer can be formed on the surface of the polyester yarn after curing; wherein the epoxy flame retardant provides a certain flame retardant performance, and the epoxy organosilicon quaternary ammonium salt can not only enhance the antibacterial performance of the polyester yarn surface, but also is an application of an organosilicon cationic surfactant, which plays a role in solubilizing and emulsifying the modifier.

[0022] The present invention prepares fabrics by blending polyester and bio-based spinning fibers, wherein the bio-based spinning fibers are obtained by mixing carboxymethyl cellulose solution and chitosan solution through electrostatic spinning technology. In the bio-based spinning fibers, chitosan has good antibacterial properties, and improves the antibacterial effect and antibacterial persistence together with the epoxy silicone quaternary ammonium salt in the modifier. Carboxymethyl cellulose and chitosan are both porous structural materials, so they have higher porosity, which can improve the air permeability of the fabric. In addition, during the actual research and development process, the inventor unexpectedly found that compared with the polyester fabric modified by a single modifier, the polyester fabric in the present invention has better flame retardant properties. After repeated studies, the inventor believes that it is mainly due to the presence of chitosan in the bio-based spinning fibers. Chitosan contains a large amount of amino groups, and the polyurethane coating on the surface of the modified polyester decomposes during the combustion process to produce isocyanate groups, which can react with the amino groups in chitosan, thereby reducing the concentration of combustible substances, thereby inhibiting the combustion process and further improving the flame retardant effect. It should be noted that the higher the amount of bio-based spinning fiber, the better. Too much of it will lead to reduced wrinkle resistance and resilience of the fabric. Therefore, the present invention controls the amount of the two when blending the yarn. Specifically, by weight percentage, 15-20% bio-based spinning fiber and 80-85% modified polyester yarn. DETAILED DESCRIPTION

[0023] 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.

[0024] Materials and sources used in the present invention: polyester yarn is recycled 150D polyester high elastic yarn DTY, which comes from Zhejiang Huilong New Materials Co., Ltd.; carboxymethyl cellulose comes from Hebei Yufei Chemical Co., Ltd.; chitosan (deacetylation degree ≥ 85%) comes from Shaanxi Lanhe Biotechnology Co., Ltd.; and the curing agent is triethylenetetramine.

[0025] Embodiment 1: An environmentally friendly breathable polyester fabric and a preparation process thereof, comprising the following steps:

[0026] Step 1:

[0027] S11: dispersing eugenol in ethyl acetate, using triethylamine as an acid-binding agent, cooling in an ice bath until the system temperature is stable, adding phenyl dichlorophosphate, stirring at 20°C for 24 hours, and finally separating, washing and rotary evaporating the product to obtain dieugenol phenyl phosphate; wherein eugenol and phenyl dichlorophosphate are reacted in a molar ratio of 2:1;

[0028] S12: dispersing dieugenol phenyl phosphate in ethyl acetate, adding meta-chloroperbenzoic acid at 40° C. with stirring and reacting for 48 hours; after the reaction, separating, washing, rotary evaporating, cooling and recrystallizing the reaction product, and drying to obtain an epoxy flame retardant; wherein dieugenol phenyl phosphate and meta-chloroperbenzoic acid react in a molar ratio of 1:2;

[0029] Step 2:

[0030] In a nitrogen environment, N,N-diethylaminopropylmethyldimethoxysilane is dispersed in anhydrous methanol, the temperature is raised to 55°C, a mixed solution of epichlorohydrin and anhydrous methanol is added, and after the addition is completed, the mixture is kept warm for 6 hours, the anhydrous methanol is removed by rotary evaporation, and the mixture is eluted with anhydrous ether, and the mixture is dried in a vacuum to obtain an epoxy organosilicon quaternary ammonium salt; wherein N,N-diethylaminopropylmethyldimethoxysilane reacts with epichlorohydrin in a molar ratio of 1:1;

[0031] Step 3:

[0032] 35 g of isophorone diisocyanate and 100 g of polyethylene glycol 1000 were mixed, dibutyltin dilaurate was used as a catalyst, and the mixture was reacted at 50° C. for 1 h, and then 6.4 g of dimethylolpropionic acid was added and reacted for 0.5 h, and then 5.9 g of 1,4-butanediol was added and reacted for 1 h to obtain an isocyanate-terminated polyurethane prepolymer; glycidol was added at a molar ratio of isocyanate group to hydroxyl group of 1:1 and reacted for 1 h, and 10.6 g of triethylamine was added to cool and neutralized, and deionized water was added for emulsification to obtain an epoxy polyurethane emulsion with a solid content of 30%;

[0033] Step 4:

[0034] 100 g of epoxy polyurethane emulsion, 8 g of epoxy flame retardant, 14 g of epoxy organosilicon quaternary ammonium salt, and 22 g of curing agent are mixed to obtain a modifier; after washing and drying the polyester yarn, the polyester yarn is immersed in the modifier at a bath ratio of 1:20 for 60 min, taken out and vacuum dried at 80° C. for 3 h to obtain a modified polyester yarn;

[0035] Step 5:

[0036] The carboxymethyl cellulose powder is dissolved in deionized water to obtain a carboxymethyl cellulose solution with a mass concentration of 10%; the chitosan powder is dissolved in an acetic acid solution with a volume concentration of 3% to obtain a chitosan solution with a mass fraction of 3%; the PVA solution and the chitosan solution are mixed at a volume ratio of 5:1, 3% glycerol of the total mass of the mixed solution is added, and the mixture is mixed in an oil bath at 110°C to obtain a spinning solution; the spinning solution is subjected to electrostatic spinning to obtain bio-based spinning fibers; and 15% of the bio-based spinning fibers and 85% of the modified polyester fibers are blended by weight to obtain a finished product.

[0037] Embodiment 2: An environmentally friendly breathable polyester fabric and a preparation process thereof, comprising the following steps:

[0038] Step 1:

[0039] S11: dispersing eugenol in ethyl acetate, using triethylamine as an acid-binding agent, cooling in an ice bath until the system temperature is stable, adding phenyl dichlorophosphate, stirring at 25°C for 24 hours, and finally separating, washing and rotary evaporating the product to obtain dieugenol phenyl phosphate; wherein eugenol and phenyl dichlorophosphate are reacted in a molar ratio of 2:1;

[0040] S12: dispersing dieugenol phenyl phosphate in ethyl acetate, adding meta-chloroperbenzoic acid at 45° C. with stirring and reacting for 50 hours; after the reaction, separating, washing, rotary evaporating, cooling and recrystallizing the reaction product, and drying to obtain an epoxy flame retardant; wherein dieugenol phenyl phosphate and meta-chloroperbenzoic acid react in a molar ratio of 1:2;

[0041] Step 2:

[0042] In a nitrogen environment, N,N-diethylaminopropylmethyldimethoxysilane is dispersed in anhydrous methanol, the temperature is raised to 60°C, a mixed solution of epichlorohydrin and anhydrous methanol is added, and after the addition is completed, the mixture is kept warm for 8 hours, the anhydrous methanol is removed by rotary evaporation, and the mixture is eluted with anhydrous ether, and the mixture is dried in a vacuum to obtain an epoxy organosilicon quaternary ammonium salt; wherein N,N-diethylaminopropylmethyldimethoxysilane reacts with epichlorohydrin in a molar ratio of 1:1;

[0043] Step 3:

[0044] 35 g of isophorone diisocyanate and 100 g of polyethylene glycol 1000 were mixed, dibutyltin dilaurate was used as a catalyst, and the mixture was reacted at 55° C. for 1.5 h, and then 6.4 g of dimethylolpropionic acid was added and reacted for 1 h, and then 5.9 g of 1,4-butanediol was added and reacted for 1.5 h to obtain an isocyanate-terminated polyurethane prepolymer; glycidol was added at a molar ratio of isocyanate group to hydroxyl group of 1:1 and reacted for 1.5 h, cooled, 10.6 g of triethylamine was added and neutralized, and deionized water was added and emulsified to obtain an epoxy polyurethane emulsion with a solid content of 30%;

[0045] Step 4:

[0046] 100 g of epoxy polyurethane emulsion, 8 g of epoxy flame retardant, 14 g of epoxy organosilicon quaternary ammonium salt, and 22 g of curing agent are mixed to obtain a modifier; after washing and drying the polyester yarn, the polyester yarn is immersed in the modifier at a bath ratio of 1:20 for 75 min, taken out and vacuum dried at 85° C. for 4 h to obtain a modified polyester yarn;

[0047] Step 5:

[0048] The carboxymethyl cellulose powder is dissolved in deionized water to obtain a carboxymethyl cellulose solution with a mass concentration of 10%; the chitosan powder is dissolved in an acetic acid solution with a volume concentration of 3% to obtain a chitosan solution with a mass fraction of 3%; the PVA solution and the chitosan solution are mixed at a volume ratio of 5:1, 3% glycerol of the total mass of the mixed solution is added, and the mixture is mixed in an oil bath at 115°C to obtain a spinning solution; the spinning solution is electrostatically spun to obtain bio-based spinning fibers; and 18% of the bio-based spinning fibers and 82% of the modified polyester fibers are blended by weight to obtain a finished product.

[0049] Embodiment 3: An environmentally friendly breathable polyester fabric and a preparation process thereof, comprising the following steps:

[0050] Step 1:

[0051] S11: dispersing eugenol in ethyl acetate, using triethylamine as an acid-binding agent, cooling in an ice bath until the system temperature is stable, adding phenyl dichlorophosphate, stirring at 30° C. for 24 hours, and finally separating, washing and rotary evaporating the product to obtain dieugenol phenyl phosphate; wherein eugenol and phenyl dichlorophosphate are reacted in a molar ratio of 2:1;

[0052] S12: dispersing dieugenol phenyl phosphate in ethyl acetate, adding meta-chloroperbenzoic acid at 50° C. with stirring and reacting for 52 hours; after the reaction, separating, washing, rotary evaporating, cooling and recrystallizing the reaction product, and drying to obtain an epoxy flame retardant; wherein dieugenol phenyl phosphate and meta-chloroperbenzoic acid react in a molar ratio of 1:2;

[0053] Step 2:

[0054] In a nitrogen environment, N,N-diethylaminopropylmethyldimethoxysilane is dispersed in anhydrous methanol, the temperature is raised to 65°C, a mixed solution of epichlorohydrin and anhydrous methanol is added, and after the addition is completed, the mixture is kept warm for 10 hours, the anhydrous methanol is removed by rotary evaporation, and the mixture is eluted with anhydrous ether, and the mixture is dried in a vacuum to obtain an epoxy organosilicon quaternary ammonium salt; wherein N,N-diethylaminopropylmethyldimethoxysilane reacts with epichlorohydrin in a molar ratio of 1:1;

[0055] Step 3:

[0056] 35 g of isophorone diisocyanate and 100 g of polyethylene glycol 1000 were mixed, dibutyltin dilaurate was used as a catalyst, and the mixture was reacted at 60° C. for 2 h, and then 6.4 g of dimethylolpropionic acid was added and reacted for 1 h, and then 5.9 g of 1,4-butanediol was added and reacted for 2 h to obtain an isocyanate-terminated polyurethane prepolymer; glycidol was added in a molar ratio of isocyanate group to hydroxyl group of 1:1 and reacted for 2 h, and 10.6 g of triethylamine was added to cool and neutralized, and deionized water was added for emulsification to obtain an epoxy polyurethane emulsion with a solid content of 30%;

[0057] Step 4:

[0058] 100 g of epoxy polyurethane emulsion, 8 g of epoxy flame retardant, 14 g of epoxy organosilicon quaternary ammonium salt, and 22 g of curing agent are mixed to obtain a modifier; after washing and drying the polyester yarn, the polyester yarn is immersed in the modifier at a bath ratio of 1:20 for 90 min, taken out and vacuum dried at 90° C. for 5 h to obtain a modified polyester yarn;

[0059] Step 5:

[0060] The carboxymethyl cellulose powder is dissolved in deionized water to obtain a carboxymethyl cellulose solution with a mass concentration of 10%; the chitosan powder is dissolved in an acetic acid solution with a volume concentration of 3% to obtain a chitosan solution with a mass fraction of 3%; the PVA solution and the chitosan solution are mixed at a volume ratio of 5:1, 3% glycerol of the total mass of the mixed solution is added, and the mixture is mixed in an oil bath at 120°C to obtain a spinning solution; the spinning solution is subjected to electrostatic spinning to obtain bio-based spinning fibers; and 20% of the bio-based spinning fibers and 85% of the modified polyester fibers are blended by weight to obtain a finished product.

[0061] Comparative Example 1: The polyester filament is not modified, and the other parameters are the same as those in Example 1.

[0062] The carboxymethyl cellulose powder is dissolved in deionized water to obtain a carboxymethyl cellulose solution with a mass concentration of 10%; the chitosan powder is dissolved in an acetic acid solution with a volume concentration of 3% to obtain a chitosan solution with a mass fraction of 3%; the PVA solution and the chitosan solution are mixed at a volume ratio of 5:1, 3% glycerol of the total mass of the mixed solution is added, and the mixture is mixed in an oil bath at 110°C to obtain a spinning solution; the spinning solution is subjected to electrostatic spinning to obtain bio-based spinning fibers; and 15% of the bio-based spinning fibers and 85% of polyester fibers are blended by weight to obtain a finished product.

[0063] Comparative Example 2: No bio-based spinning fiber was added, and the other parameters were the same as those in Example 2.

[0064] Step 1:

[0065] S11: dispersing eugenol in ethyl acetate, using triethylamine as an acid-binding agent, cooling in an ice bath until the system temperature is stable, adding phenyl dichlorophosphate, stirring at 25°C for 24 hours, and finally separating, washing and rotary evaporating the product to obtain dieugenol phenyl phosphate; wherein eugenol and phenyl dichlorophosphate are reacted in a molar ratio of 2:1;

[0066] S12: dispersing dieugenol phenyl phosphate in ethyl acetate, adding meta-chloroperbenzoic acid at 45° C. with stirring and reacting for 50 hours; after the reaction, separating, washing, rotary evaporating, cooling and recrystallizing the reaction product, and drying to obtain an epoxy flame retardant; wherein dieugenol phenyl phosphate and meta-chloroperbenzoic acid react in a molar ratio of 1:2;

[0067] Step 2:

[0068] In a nitrogen environment, N,N-diethylaminopropylmethyldimethoxysilane is dispersed in anhydrous methanol, the temperature is raised to 60°C, a mixed solution of epichlorohydrin and anhydrous methanol is added, and after the addition is completed, the mixture is kept warm for 8 hours, the anhydrous methanol is removed by rotary evaporation, and the mixture is eluted with anhydrous ether, and the mixture is dried in a vacuum to obtain an epoxy organosilicon quaternary ammonium salt; wherein N,N-diethylaminopropylmethyldimethoxysilane reacts with epichlorohydrin in a molar ratio of 1:1;

[0069] Step 3:

[0070] 35 g of isophorone diisocyanate and 100 g of polyethylene glycol 1000 were mixed, dibutyltin dilaurate was used as a catalyst, and the mixture was reacted at 55° C. for 1.5 h, and then 6.4 g of dimethylolpropionic acid was added and reacted for 1 h, and then 5.9 g of 1,4-butanediol was added and reacted for 1.5 h to obtain an isocyanate-terminated polyurethane prepolymer; glycidol was added at a molar ratio of isocyanate group to hydroxyl group of 1:1 and reacted for 1.5 h, cooled, 10.6 g of triethylamine was added and neutralized, and deionized water was added and emulsified to obtain an epoxy polyurethane emulsion with a solid content of 30%;

[0071] Step 4:

[0072] 100g of epoxy polyurethane emulsion, 8g of epoxy flame retardant, 14g of epoxy silicone quaternary ammonium salt and 22g of curing agent are mixed to obtain a modifier; after washing and drying the polyester yarn, it is immersed in the modifier at a bath ratio of 1:20 for 75min, taken out and vacuum dried at 85°C for 4h to obtain a modified polyester yarn; the modified polyester fiber is woven to obtain a finished product.

[0073] Comparative Example 3: The content of bio-based spinning fibers was increased, and the other parameters were the same as those in Example 3.

[0074] Step 1:

[0075] S11: dispersing eugenol in ethyl acetate, using triethylamine as an acid-binding agent, cooling in an ice bath until the system temperature is stable, adding phenyl dichlorophosphate, stirring at 30° C. for 24 hours, and finally separating, washing and rotary evaporating the product to obtain dieugenol phenyl phosphate; wherein eugenol and phenyl dichlorophosphate are reacted in a molar ratio of 2:1;

[0076] S12: dispersing dieugenol phenyl phosphate in ethyl acetate, adding meta-chloroperbenzoic acid at 50° C. with stirring and reacting for 52 hours; after the reaction, separating, washing, rotary evaporating, cooling and recrystallizing the reaction product, and drying to obtain an epoxy flame retardant; wherein dieugenol phenyl phosphate and meta-chloroperbenzoic acid react in a molar ratio of 1:2;

[0077] Step 2:

[0078] In a nitrogen environment, N,N-diethylaminopropylmethyldimethoxysilane is dispersed in anhydrous methanol, the temperature is raised to 65°C, a mixed solution of epichlorohydrin and anhydrous methanol is added, and after the addition is completed, the mixture is kept warm for 10 hours, the anhydrous methanol is removed by rotary evaporation, and the mixture is eluted with anhydrous ether, and the mixture is dried in a vacuum to obtain an epoxy organosilicon quaternary ammonium salt; wherein N,N-diethylaminopropylmethyldimethoxysilane reacts with epichlorohydrin in a molar ratio of 1:1;

[0079] Step 3:

[0080] 35 g of isophorone diisocyanate and 100 g of polyethylene glycol 1000 were mixed, dibutyltin dilaurate was used as a catalyst, and the mixture was reacted at 60° C. for 2 h, and then 6.4 g of dimethylolpropionic acid was added and reacted for 1 h, and then 5.9 g of 1,4-butanediol was added and reacted for 2 h to obtain an isocyanate-terminated polyurethane prepolymer; glycidol was added in a molar ratio of isocyanate group to hydroxyl group of 1:1 and reacted for 2 h, and 10.6 g of triethylamine was added to cool and neutralized, and deionized water was added for emulsification to obtain an epoxy polyurethane emulsion with a solid content of 30%;

[0081] Step 4:

[0082] 100 g of epoxy polyurethane emulsion, 8 g of epoxy flame retardant, 14 g of epoxy organosilicon quaternary ammonium salt, and 22 g of curing agent are mixed to obtain a modifier; after washing and drying the polyester yarn, the polyester yarn is immersed in the modifier at a bath ratio of 1:20 for 90 min, taken out and vacuum dried at 90° C. for 5 h to obtain a modified polyester yarn;

[0083] Step 5:

[0084] The carboxymethyl cellulose powder is dissolved in deionized water to obtain a carboxymethyl cellulose solution with a mass concentration of 10%; the chitosan powder is dissolved in an acetic acid solution with a volume concentration of 3% to obtain a chitosan solution with a mass fraction of 3%; the PVA solution and the chitosan solution are mixed at a volume ratio of 5:1, 3% glycerol of the total mass of the mixed solution is added, and the mixture is mixed in an oil bath at 120°C to obtain a spinning solution; the spinning solution is electrostatically spun to obtain bio-based spinning fibers; and 30% of the bio-based spinning fibers and 70% of the modified polyester fibers are blended by weight to obtain a finished product.

[0085] Experiment: Performance tests were performed on the finished products prepared in Examples 1 to 3 and Comparative Examples 1 to 3.

[0086] Flame retardant properties: Cut the fabric into strip samples with a length of 10 cm and a width of 1 cm, and use the limiting oxygen index to test the flame retardant properties.

[0087] Breathability: Refer to GB / T24218.15-2018 to test the air permeability. Use a fully automatic fabric air permeability tester to test the average air flow through the sample. Each sample is tested 3 times and the results are taken as the arithmetic average.

[0088] Antibacterial performance: Antibacterial test was carried out according to GB / T20944.2-2007. The antibacterial effect on Escherichia coli was calculated by plate count method. The antibacterial rate formula is:

[0089] A=(C0-C0) / C0×100%;

[0090] Among them, A is the inhibition rate, %; C0 is the initial number of bacteria, pieces; C is the number of bacteria after antibacterial treatment (pieces).

[0091] Anti-wrinkle elasticity: The acute recovery angle of wrinkles is measured with reference to GB / T3819-1997 "Textile fabrics - Test of crease recovery of folded specimens expressed by recovery angle".

[0092] The experimental results are shown in Table 1.

[0093] Table 1. Test results of various properties of environmentally friendly breathable polyester fabrics

[0094] project Limiting oxygen index Air permeability (mm / s) Antimicrobial properties Acute recovery angle of wrinkle Example 1 27.2％ 897.5 99.4％ 287° Example 2 27.3％ 914.8 99.5％ 275° Example 3 27.4％ 925.1 99.5％ 264° Comparative Example 1 19.6％ 898.9 87.4％ 290° Comparative Example 2 25.7％ 723.6 99.5％ 300° Comparative Example 3 27.6％ 985.4 99.5％ 229°

[0095] Conclusion: The data of Examples 1 to 3 show that the polyester fabric prepared by the present invention has excellent performance. The data of Example 1 and Comparative Example 1 show that after the polyester is modified by the modifier, the flame retardant and antibacterial properties of the fabric are significantly improved; the data of Example 2 and Comparative Example 2 show that the addition of bio-based spinning fibers is beneficial to improving the flame retardant and air permeability of the fabric; the data of Example 3 and Comparative Example 3 show that excessive use of bio-based spinning fibers will lead to reduced wrinkle resistance and poor resilience of the fabric.

[0096] 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 process for preparing an environmentally friendly breathable polyester fabric, characterized in that: The following steps are involved: Step 1: The epoxy polyurethane emulsion, epoxy flame retardant, epoxy organosilicon quaternary ammonium salt and curing agent are mixed to obtain a modifier; after washing and drying the polyester yarn, the polyester yarn is immersed in the modifier at a bath ratio of 1:(15-20) for 60-90 minutes, and after taking out, the polyester yarn is vacuum dried at 80-90° C. for 3-5 hours to obtain a modified polyester yarn; Step 2: The carboxymethyl cellulose powder is dissolved in deionized water to obtain a carboxymethyl cellulose solution with a mass concentration of 10-15%; the chitosan powder is dissolved in an acetic acid solution with a volume concentration of 2-3% to obtain a chitosan solution with a mass fraction of 2-3%; the chitosan solution is added to the carboxymethyl cellulose solution at a volume ratio of (3-5):1 to obtain a mixed solution; 1-3% of glycerol in the total mass of the mixed solution is added to the mixed solution, and the mixture is mixed in an oil bath at 110-120° C. to obtain a spinning solution; the spinning solution is subjected to electrostatic spinning to obtain a bio-based spinning fiber; and the bio-based spinning fiber and a modified polyester fiber are blended to obtain a finished product.

2. The process for preparing an environmentally friendly breathable polyester fabric according to claim 1, characterized in that: The content of each component in the modifier, by weight, is 100 parts of epoxy polyurethane emulsion, 5 to 8 parts of epoxy flame retardant, 10 to 14 parts of epoxy organosilicon quaternary ammonium salt, and 20 to 24 parts of curing agent.

3. The process for preparing an environmentally friendly breathable polyester fabric according to claim 1, characterized in that: The preparation method of epoxy polyurethane emulsion is as follows: 35-50 parts of isophorone diisocyanate and 100 parts of polyethylene glycol 1000 are mixed by weight, dibutyltin dilaurate is used as a catalyst, the mixture is reacted at 50-60°C for 1-2 hours, 6-8 parts of dihydroxymethylpropionic acid are added for reaction for 0.5-1 hour, and 5-7 parts of 1,4-butanediol are added for reaction for 1-2 hours to obtain isocyanate-terminated polyurethane prepolymer; glycidol is added at a molar ratio of isocyanate group to hydroxyl group of 1:1 for reaction for 1-2 hours, 9-13 parts of triethylamine are added for neutralization reaction after cooling, and deionized water is added for emulsification to obtain epoxy polyurethane emulsion with a solid content of 30-40%.

4. The process for preparing an environmentally friendly breathable polyester fabric according to claim 1, characterized in that: The preparation method of the epoxy flame retardant comprises the following steps: S1: Disperse eugenol in ethyl acetate, use triethylamine as an acid-binding agent, cool in an ice bath until the system temperature is stable, add phenyl dichlorophosphate, stir at 20-30°C for 24h, and finally separate, wash and rotary evaporate the product to obtain dieugenol phenyl phosphate; S2: Disperse dieugenol phenyl phosphate in ethyl acetate, add m-chloroperbenzoic acid at 40-50° C. with stirring and react for 48-52 hours; after the reaction, separate the reaction product, wash, rotary evaporate, cool and recrystallize, and dry to obtain an epoxy flame retardant.

5. The process for preparing an environmentally friendly breathable polyester fabric according to claim 4, characterized in that: In S1, eugenol and phenyl dichloride phosphate are reacted in a molar ratio of 2:

1.

6. The process for preparing an environmentally friendly breathable polyester fabric according to claim 4, characterized in that: In S2, dieugenylphenyl phosphate is reacted with m-chloroperbenzoic acid at a molar ratio of 1:

2.

7. The process for preparing an environmentally friendly breathable polyester fabric according to claim 1, characterized in that: The preparation method of epoxy organosilicon quaternary ammonium salt is as follows: in a nitrogen environment, N, N-diethylaminopropylmethyldimethoxysilane is dispersed in anhydrous methanol, the temperature is raised to 55-65°C, a mixed solution of epichlorohydrin and anhydrous methanol is added, the reaction is kept warm for 6-10 hours, the anhydrous methanol is removed by rotary evaporation and eluted with anhydrous ether, and the epoxy organosilicon quaternary ammonium salt is obtained by vacuum drying.

8. The process for preparing an environmentally friendly breathable polyester fabric according to claim 7, characterized in that: N,N-diethylaminopropylmethyldimethoxysilane was reacted with epichlorohydrin in a molar ratio of 1:

1.

9. The process for preparing an environmentally friendly breathable polyester fabric according to claim 1, characterized in that: The environmentally friendly breathable polyester fabric contains 15-20% bio-based spinning fibers and 80-85% modified polyester blends by weight.

10. The environmentally friendly breathable polyester fabric prepared by the preparation process according to any one of claims 1 to 9.