Fabric with anti-wrinkle and color-retaining functions and preparation method thereof

Abstract

The present invention relates to the field of fabrics, specifically a kind of fabric with anti-wrinkle and color-preserving function and its preparation method. The preparation method of the fabric with anti-wrinkle and color-preserving function comprises the following steps: preparing hydroxybenzotriazole by reacting 2-(2,4-dihydroxyphenyl)-2H-benzotriazole with 4-bromo-1-butanol; modifying nano titanium dioxide with 3-mercaptopropyltriethoxysilane to obtain mercapto-modified nano titanium dioxide; obtaining anti-wrinkle and color-preserving finishing agent by reacting maleic acid, 2,2-dihydroxymethylpropionic acid, citric acid, hydroxybenzotriazole, 1,6-hexanedithiol, and mercapto-modified nano titanium dioxide; impregnating a blended fabric spun from pure cotton yarn and polyester yarn in a finishing solution prepared with an anti-wrinkle and color-preserving finishing agent, and then baking, washing, and air-drying to obtain an anti-wrinkle and color-preserving fabric. The fabric with anti-wrinkle and color-preserving function prepared by the present invention has good anti-wrinkle and color-preserving properties and good UV protection.

Description

Technical Field

[0001] The invention relates to the field of fabrics, in particular to a fabric with anti-wrinkle and color-preserving functions and a preparation method thereof. Background Art

[0002] Cotton fiber is a natural fiber. The fabrics made from it have good moisture absorption and breathability, are soft and do not hurt the skin. However, it is not resistant to yellowing and is prone to wrinkles during washing and folding. It is difficult to recover in a short time, which seriously affects the neatness and appearance of the clothes. Therefore, when using cotton fiber to make fabrics, the prepared fabrics need to be treated with anti-wrinkle treatment.

[0003] Chinese patent CN112981964B discloses a wrinkle-resistant fabric processing technology and wrinkle-resistant fabric, wherein the silk fabric is treated with two finishing agents successively, and a polyurethane-organic silicon flexible long-chain structure is generated by the reaction of polyurethane and organosilicon, which ensures that the fabric has good wrinkle-resistant performance and the softness of the fabric during subsequent processing, and the yellowing resistance of the fabric is ensured by adding citric acid. However, the main component of silk fabric is protein fiber, which is a nitrogen-containing polymer compound, and the single base of its macromolecule is α-amino acid, while the main component of cotton fiber is cellulose, and the chemical structure of cellulose is composed of α-glucose as a basic structural unit. The two raw materials have different structural compositions and properties, so the wrinkle-resistant fabric processing technology is not very applicable to cotton fiber fabrics. Chinese patent CN112877851B discloses a process for preparing a wrinkle-resistant blended fabric, wherein cotton fiber and polyester fiber are blended to form a fabric, and then the blended fabric is padded with an anti-wrinkle finishing liquid, wherein the anti-wrinkle finishing liquid includes polyvinyl alcohol acetal resin, ethylene glycol diacrylate, sodium bicarbonate, triethanolamine, anhydrous magnesium chloride, acetone and additives, and the fabric is padded and dried to obtain a finished anti-wrinkle blended fabric, which has excellent anti-wrinkle performance. However, the anti-wrinkle finishing liquid contains polyvinyl alcohol acetal, which will decompose and release acetaldehyde under acidic conditions, which is harmful to people's health. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a fabric with anti-wrinkle and color-preserving functions and a preparation method thereof, which solves the problem that cotton fiber fabrics have poor anti-wrinkle performance and are prone to yellowing.

[0005] In order to achieve the above object, the present invention provides a fabric with anti-wrinkle and color-preserving functions and a preparation method thereof, comprising the following steps:

[0006] Step (1), preparing hydroxybenzotriazole;

[0007] 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, N,N-dimethylformamide and anhydrous potassium carbonate are mixed evenly, stirred and heated, 4-bromo-1-butanol is added dropwise, and after the addition is completed, the temperature is continued to be raised to react, and after the reaction, the reaction is separated, purified and dried to obtain hydroxybenzotriazole;

[0008] Step (2) preparing an anti-wrinkle and color-preserving finishing agent;

[0009] Polyester polyacid preparation stage:

[0010] Maleic acid, 2,2-dimethylolpropionic acid, N,N-dimethylformamide and p-toluenesulfonic acid are mixed, stirred and heated, reacted, and purified after the reaction to obtain a polyester polyacid;

[0011] Hyperbranched polyester polyacid preparation stage:

[0012] Mixing polyester polyacid, citric acid, hydroxybenzotriazole, N,N-dimethylformamide and p-toluenesulfonic acid, stirring and heating, reacting, and purifying after the reaction to obtain a hyperbranched polyester polyacid;

[0013] Preparation stage of anti-wrinkle and color-retaining finishing agent:

[0014] The hyperbranched polyester polyacid, N,N-dimethylformamide, 1,6-hexanedithiol, and mercapto-modified nano titanium dioxide dispersion are uniformly mixed, the pH is adjusted, and the mixture is reacted at a set temperature to obtain an anti-wrinkle and color-retaining finishing agent;

[0015] Step (3), preparing anti-wrinkle and color-retaining functional fabric

[0016] Mixing an anti-wrinkle and color-retaining finishing agent, sodium hypophosphite and water to prepare a finishing liquid;

[0017] Cotton fiber and polyester fiber are blended to make warp yarn and weft yarn respectively, the warp yarn and weft yarn are spun into blended fabric, the blended fabric is immersed in finishing liquid, double-immersed and double-rolled, baked, washed and air-dried to obtain wrinkle-resistant and color-retaining functional fabric.

[0018] Preferably, the heating temperature in the stirring and heating in step (1) is 70° C., the time for dropping 4-bromo-1-butanol is 2 hours, the heating temperature for further heating is 110-120° C., and the reaction time is 2-3 hours;

[0019] The mass ratio of 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, N,N-dimethylformamide, anhydrous potassium carbonate and 4-bromo-1-butanol is (220-240):(500-600):(200-240):(200-210).

[0020] Preferably, in step (1), separation and purification comprises adjusting the pH value to 7, removing the solvent by rotary evaporation, washing, filtering, dissolving and recrystallizing, and filtering; and the drying condition is drying at 60-80° C. for 12-18 hours.

[0021] Preferably, in step (2), the mass ratio of maleic acid, 2,2-dihydroxymethylpropionic acid, N,N-dimethylformamide and p-toluenesulfonic acid is (110-130):(100-120):(180-200):0.5;

[0022] The mass ratio of polyester polyacid, citric acid, hydroxybenzotriazole, N,N-dimethylformamide and p-toluenesulfonic acid is (210-250):(110-120):(10-18):(320-360):1;

[0023] The mass ratio of hyperbranched polyester polyacid, N,N-dimethylformamide, 1,6-hexanedithiol, and mercapto-modified nano-titanium dioxide dispersion is (320-370):(240-280):(140-150):(75-100).

[0024] Preferably, in step (2),

[0025] In the preparation stage of polyester polyacid, the heating temperature during stirring and heating is 100-110°C and the reaction time is 2-3h; in the preparation stage of hyperbranched polyester polyacid, the heating temperature during stirring and heating is 110-120°C and the reaction time is 6-8h; in the preparation stage of anti-wrinkle and color-retaining finishing agent, the set temperature is 50-60°C and the reaction time is 6-8h; in the preparation stage of anti-wrinkle and color-retaining finishing agent, the pH value is adjusted to 9;

[0026] The two purification operations in the polyester polyacid preparation stage and the anti-wrinkle color-preserving finishing agent preparation stage are the same, including: removing the solvent by rotary evaporation, washing with ethanol, and drying at 70-80° C. for 4-6 hours.

[0027] Preferably, the mercapto-modified nano-titanium dioxide dispersion in step (2) is prepared by the following steps:

[0028] Mixing nano-titanium dioxide and ethanol aqueous solution to obtain a mixture, adjusting the pH value of the mixture to 4, ultrasonically dispersing the mixture to obtain a nano-titanium dioxide dispersion, and dropping 3-mercaptopropyltriethoxysilane into the nano-titanium dioxide dispersion to react, filtering, washing, and drying after the reaction to obtain mercapto-modified nano-titanium dioxide;

[0029] The mercapto-modified nano titanium dioxide and N,N-dimethylformamide are mixed and ultrasonically dispersed to obtain a mercapto-modified nano titanium dioxide dispersion.

[0030] Preferably, the mass ratio of nano-titanium dioxide, ethanol aqueous solution, and 3-mercaptopropyltriethoxysilane is 10:90:(0.1-1.5);

[0031] The reaction conditions are 55-65°C for 2-3h;

[0032] The mass ratio of mercapto-modified nano-titanium dioxide and N,N-dimethylformamide is 10:40.

[0033] Preferably, the ethanol aqueous solution comprises a 90 wt % ethanol aqueous solution.

[0034] Preferably, in step (3), the mass ratio of the anti-wrinkle and color-preserving finishing agent, sodium hypophosphite and water is (100-180):(10-18):1000.

[0035] Preferably, in step (3), the mass ratio of cotton fiber to polyester fiber in the warp yarn is 60:40, the mass ratio of cotton fiber to polyester fiber in the weft yarn is 80:20, the count of the warp yarn is 40S, the count of the weft yarn is 40S, the warp density of the fabric is 500 yarns / 100cm, and the weft density is 320 yarns / 10cm.

[0036] Preferably, in the step (3), the bath ratio during immersion is 10:1, the immersion temperature is 45° C., the immersion time is 10 min, and the baking conditions include pre-baking at 80° C. for 10 min and then baking at 150° C. for 5 min.

[0037] Preferably, a fabric with anti-wrinkle and color-preserving function is prepared by the above-mentioned method for preparing a fabric with anti-wrinkle and color-preserving function.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. This scheme modifies benzotriazole and introduces hydroxyl groups to obtain hydroxybenzotriazole, which is grafted onto polyester polyacid to inhibit the migration of benzotriazole; the surface of nano-titanium dioxide is modified with a mercaptosilane coupling agent to obtain mercapto-modified nano-titanium dioxide, which is connected with hyperbranched polyester polyacid to increase the compatibility of nano-titanium dioxide; nano-titanium dioxide is an inorganic ultraviolet absorber, which requires a large amount to have a good anti-ultraviolet effect when used alone, and benzotriazole, as an organic ultraviolet absorber, has a good anti-ultraviolet effect when used in a small amount. The compounding of benzotriazole and nano-titanium dioxide can effectively inhibit the yellowing of fabrics due to ultraviolet rays and play a role in color preservation. At the same time, nano-titanium dioxide has a good whitening effect and can ensure the whiteness of the fabric.

[0040] 2. This scheme first utilizes 2,2-dihydroxymethylpropionic acid and maleic acid to react to prepare polyester polyacid, then adds citric acid and hydroxybenzotriazole, and then adds 1,6-hexanedithiol and mercapto-modified nano titanium dioxide after the reaction to obtain an anti-wrinkle and color-preserving finishing agent; the carboxylic acid groups of maleic acid and 2,2-dihydroxymethylpropionic acid are used to block the hydroxyl groups of citric acid to prevent the citric acid from being dehydrated by heat to generate aconitic acid, which causes the fabric to turn yellow; then the double bond of maleic acid is used to react with the mercapto groups of 1,6-hexanedithiol and mercapto-modified nano titanium dioxide to introduce mercapto groups into the polyester polyacid to obtain an anti-wrinkle and color-preserving finishing agent; the carboxyl groups in the anti-wrinkle and color-preserving finishing agent react with the hydroxyl groups of cellulose and polyester fibers to form crosslinking to improve the anti-wrinkle performance of the fabric; then dynamic disulfide bonds are generated through mercapto groups, and the property that the dynamic disulfide bonds can be converted into mercapto groups is used to ensure that the fabric will not lose strength due to excessive crosslinking. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a process flow chart of the preparation of the anti-wrinkle and color-preserving finishing agent prepared by the present invention;

[0042] Figure 2 is a schematic diagram of the reaction of 2-(2,4-dihydroxyphenyl)-2H-benzotriazole and 4-bromo-1-butanol;

[0043] Figure 3 It is a bar chart showing the test results of the wrinkle recovery angle of fabrics prepared in Examples 1-5 and Comparative Examples 1-3 of the present invention;

[0044] Figure 4 It is a bar chart of the test results of the appearance smoothness of the fabrics prepared in Examples 1-5 and Comparative Examples 1-3 of the present invention;

[0045] Figure 5 It is a bar chart showing the test results of the breaking strength retention rate of fabrics prepared in Examples 1-5 and Comparative Examples 1-3 of the present invention;

[0046] Figure 6 It is a bar chart of the test results of whiteness and color retention performance of fabrics prepared in Examples 1-5 and Comparative Examples 1-3 of the present invention;

[0047] Figure 7 It is a bar chart of the test results of the anti-ultraviolet performance of the fabrics prepared in Examples 1-5 and Comparative Examples 1-3 of the present invention. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0049] Example 1

[0050] This embodiment discloses a method for preparing a fabric with anti-wrinkle and color-retaining functions, comprising the following steps:

[0051] (1) 2-(2,4-dihydroxyphenyl)-2H-benzotriazole and N,N-dimethylformamide are mixed uniformly, anhydrous potassium carbonate is added, the temperature is raised to 70° C. at a stirring speed of 300 r / min, 4-bromo-1-butanol is added dropwise within 2 hours, the temperature is raised to 110° C. and the reaction is carried out for 3 hours, 3 mol / L hydrochloric acid aqueous solution is added after the reaction to adjust the pH value to 7, the solvent is removed by rotary evaporation, deionized water is added for washing, and the mixture is filtered. The filter residue and ethanol aqueous solution are heated to boiling at a mass ratio of 1:30 to dissolve the filter residue, and the mixture is filtered while hot. The filtrate is cooled and crystallized, filtered, and the resulting crystals are dried at 60° C. for 18 hours to obtain hydroxybenzotriazole;

[0052] Wherein, the mass ratio of 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, N,N-dimethylformamide, anhydrous potassium carbonate, and 4-bromo-1-butanol is 220:500:200:200, and the mass ratio of ethanol to water in the ethanol aqueous solution is 1:1;

[0053] (2) mixing nano titanium dioxide and 90 wt % ethanol aqueous solution uniformly, adding 1 mol / L hydrochloric acid aqueous solution to adjust the pH value to 4, ultrasonically dispersing at a frequency of 20 kHz for 40 min to obtain a nano titanium dioxide dispersion, adding 3-mercaptopropyltriethoxysilane dropwise within 1 h, stirring and heating to 55° C. at a stirring speed of 300 r / min, reacting for 3 h, filtering after the reaction, washing with ethanol, and vacuum drying at 50° C. for 10 h to obtain mercapto-modified nano titanium dioxide;

[0054] The mercapto-modified nano-titanium dioxide and N,N-dimethylformamide were uniformly mixed in a mass ratio of 10:40, and ultrasonically dispersed at a frequency of 20 kHz for 40 minutes to obtain a mercapto-modified nano-titanium dioxide dispersion;

[0055] Wherein, the mass ratio of nano titanium dioxide, 90wt% ethanol aqueous solution, and 3-mercaptopropyltriethoxysilane is 10:90:0.1;

[0056] (3) maleic acid, 2,2-dihydroxymethylpropionic acid, N,N-dimethylformamide, and p-toluenesulfonic acid were uniformly mixed in a mass ratio of 110:100:180:0.5, and the mixture was heated to 100° C. at a stirring speed of 300 r / min, and reacted for 3 h. After the reaction was completed, the solvent was removed by rotary evaporation, and the product was washed with ethanol and dried at 70° C. for 6 h to obtain a polyester polyacid;

[0057] (4) polyester polyacid, citric acid, hydroxybenzotriazole, N,N-dimethylformamide, and p-toluenesulfonic acid are uniformly mixed in a mass ratio of 210:110:10:320:1, stirred at a stirring speed of 300 r / min, heated to 110° C., and reacted for 8 h. After the reaction is completed, the solvent is removed by rotary evaporation, the product is washed with ethanol, and dried at 70° C. for 6 h to obtain a hyperbranched polyester polyacid;

[0058] (5) The hyperbranched polyester polyacid, N,N-dimethylformamide, 1,6-hexanedithiol, and mercapto-modified nano titanium dioxide dispersion were uniformly mixed in a mass ratio of 320:240:140:75, triethylamine was added to adjust the pH value to 9, and the mixture was stirred at a stirring speed of 300 r / min and heated to 50° C., and reacted for 8 hours to obtain an anti-wrinkle color-preserving finishing agent;

[0059] (6) spinning cotton fiber and polyester fiber into warp yarn at a mass ratio of 60:40, spinning cotton fiber and polyester fiber into weft yarn at a mass ratio of 80:20, and spinning the warp yarn and the weft yarn into a blended fabric through a weaving process;

[0060] Among them, the warp yarn count is 40S, the weft yarn count is 40S; the warp density of the blended fabric is 550 yarns / 10cm, and the weft density is 320 yarns / 10cm;

[0061] (7) The anti-wrinkle and color-retaining finishing agent, sodium hypophosphite and water are uniformly mixed to prepare a finishing solution, and the blended fabric is immersed in the finishing solution, the bath ratio is 10:1, the immersion temperature is 45° C., the immersion time is 10 min, two immersions and two rollings, and the rolling rate is 100%, and the blended fabric after the immersion treatment is pre-baked at 80° C. for 10 min, and then baked at 150° C. for 5 min, washed three times, and oxidized by ventilation at room temperature to obtain an anti-wrinkle and color-retaining functional fabric;

[0062] Among them, the mass ratio of the anti-wrinkle and color-preserving finishing agent, sodium hypophosphite and water in the finishing liquid is 100:10:1000.

[0063] Example 2

[0064] This embodiment discloses a method for preparing a fabric with anti-wrinkle and color-retaining functions, comprising the following steps:

[0065] (1) 2-(2,4-dihydroxyphenyl)-2H-benzotriazole and N,N-dimethylformamide are mixed uniformly, anhydrous potassium carbonate is added, the temperature is raised to 70° C. at a stirring speed of 300 r / min, 4-bromo-1-butanol is added dropwise within 2 hours, the temperature is raised to 115° C. and the reaction is carried out for 2.5 hours after the addition is completed, a 3 mol / L hydrochloric acid aqueous solution is added after the reaction to adjust the pH value to 7, the solvent is removed by rotary evaporation, deionized water is added for washing, and the mixture is filtered. The filter residue and ethanol aqueous solution are heated to boiling at a mass ratio of 1:30 to dissolve the filter residue, and the mixture is filtered while hot. The filtrate is cooled and crystallized, filtered, and the resulting crystals are dried at 70° C. for 15 hours to obtain hydroxybenzotriazole;

[0066] The mass ratio of 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, N,N-dimethylformamide, anhydrous potassium carbonate and 4-bromo-1-butanol is 225:525:210:205, and the mass ratio of ethanol to water in the ethanol aqueous solution is 1:1;

[0067] (2) Mix nano-titanium dioxide and 90 wt% ethanol aqueous solution, add 1 mol / L hydrochloric acid aqueous solution to adjust the pH value to 4, and ultrasonically disperse at a frequency of 30 kHz for 30 minutes to obtain a nano-titanium dioxide dispersion, add 3-mercaptopropyltriethoxysilane dropwise, and complete the addition within 1 hour. Stir and heat to 60° C. at a stirring speed of 300 r / min, and react for 2.5 hours. After the reaction, filter, wash with ethanol, and vacuum dry at 55° C. for 9 hours to obtain mercapto-modified nano-titanium dioxide. Mix mercapto-modified nano-titanium dioxide and N,N-dimethylformamide in a mass ratio of 10:40, and ultrasonically disperse at a frequency of 30 kHz for 30 minutes to obtain a mercapto-modified nano-titanium dioxide dispersion;

[0068] Wherein, the mass ratio of nano titanium dioxide, 90wt% ethanol aqueous solution, and 3-mercaptopropyltriethoxysilane is 10:90:0.5;

[0069] (3) maleic acid, 2,2-dihydroxymethylpropionic acid, N,N-dimethylformamide, and p-toluenesulfonic acid were uniformly mixed in a mass ratio of 115:105:185:0.5, and the mixture was heated to 105° C. at a stirring speed of 300 r / min, and reacted for 2.5 hours. After the reaction was completed, the solvent was removed by rotary evaporation, and the product was washed with ethanol and dried at 75° C. for 5 hours to obtain a polyester polyacid;

[0070] (4) polyester polyacid, citric acid, hydroxybenzotriazole, N,N-dimethylformamide, and p-toluenesulfonic acid are uniformly mixed in a mass ratio of 220:115:11:330:1, stirred at a stirring speed of 300 r / min, heated to 115° C., and reacted for 7 hours. After the reaction is completed, the solvent is removed by rotary evaporation, the product is washed with ethanol, and dried at 75° C. for 5 hours to obtain a hyperbranched polyester polyacid;

[0071] (5) The hyperbranched polyester polyacid, N,N-dimethylformamide, 1,6-hexanedithiol, and mercapto-modified nano titanium dioxide dispersion were uniformly mixed in a mass ratio of 345:250:145:75, triethylamine was added to adjust the pH value to 9, and the mixture was heated to 55° C. at a stirring speed of 300 r / min and reacted for 7 h to obtain an anti-wrinkle color-preserving finishing agent;

[0072] (5) spinning cotton fiber and polyester fiber into warp yarn at a mass ratio of 60:40, spinning cotton fiber and polyester fiber into weft yarn at a mass ratio of 80:20, and spinning the warp yarn and the weft yarn into a blended fabric through a weaving process;

[0073] Among them, the warp yarn count is 40S, the weft yarn count is 40S; the warp density of the blended fabric is 550 yarns / 10cm, and the weft density is 320 yarns / 10cm;

[0074] (7) The anti-wrinkle and color-retaining finishing agent, sodium hypophosphite and water are uniformly mixed to prepare a finishing solution, and the blended fabric is immersed in the finishing solution, the bath ratio is 10:1, the immersion temperature is 45° C., the immersion time is 10 min, two immersions and two rollings, and the rolling rate is 100%, and the blended fabric after the immersion treatment is pre-baked at 80° C. for 10 min, and then baked at 150° C. for 5 min, washed three times, and oxidized by ventilation at room temperature to obtain an anti-wrinkle and color-retaining functional fabric;

[0075] Among them, the mass ratio of the anti-wrinkle and color-preserving finishing agent, sodium hypophosphite and water in the finishing liquid is 120:12:1000.

[0076] Example 3

[0077] This embodiment discloses a method for preparing a fabric with anti-wrinkle and color-retaining functions, comprising the following steps:

[0078] (1) 2-(2,4-dihydroxyphenyl)-2H-benzotriazole and N,N-dimethylformamide are mixed uniformly, anhydrous potassium carbonate is added, the temperature is raised to 70° C. at a stirring speed of 300 r / min, 4-bromo-1-butanol is added dropwise within 2 hours, the temperature is raised to 115° C. and the reaction is carried out for 2.5 hours after the addition is completed, a 3 mol / L hydrochloric acid aqueous solution is added after the reaction to adjust the pH value to 7, the solvent is removed by rotary evaporation, deionized water is added for washing, and the mixture is filtered. The filter residue and ethanol aqueous solution are heated to boiling at a mass ratio of 1:30 to dissolve the filter residue, and the mixture is filtered while hot. The filtrate is cooled and crystallized, filtered, and the resulting crystals are dried at 70° C. for 15 hours to obtain hydroxybenzotriazole;

[0079] The mass ratio of 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, N,N-dimethylformamide, anhydrous potassium carbonate and 4-bromo-1-butanol is 230:550:220:205, and the mass ratio of ethanol to water in the ethanol aqueous solution is 1:1;

[0080] (2) Mix nano-titanium dioxide and 90 wt% ethanol aqueous solution, add 1 mol / L hydrochloric acid aqueous solution to adjust the pH value to 4, and ultrasonically disperse at a frequency of 30 kHz for 30 minutes to obtain a nano-titanium dioxide dispersion, add 3-mercaptopropyltriethoxysilane dropwise, and complete the addition within 1 hour. Stir and heat to 60° C. at a stirring speed of 300 r / min, and react for 2.5 hours. After the reaction, filter, wash with ethanol, and vacuum dry at 55° C. for 9 hours to obtain mercapto-modified nano-titanium dioxide. Mix mercapto-modified nano-titanium dioxide and N,N-dimethylformamide in a mass ratio of 10:40, and ultrasonically disperse at a frequency of 30 kHz for 30 minutes to obtain a mercapto-modified nano-titanium dioxide dispersion;

[0081] Wherein, the mass ratio of nano titanium dioxide, 90wt% ethanol aqueous solution, and 3-mercaptopropyltriethoxysilane is 10:90:1;

[0082] (3) maleic acid, 2,2-dihydroxymethylpropionic acid, N,N-dimethylformamide, and p-toluenesulfonic acid were uniformly mixed in a mass ratio of 120:105:190:0.5, and the mixture was heated to 105° C. at a stirring speed of 300 r / min, and reacted for 2.5 hours. After the reaction was completed, the solvent was removed by rotary evaporation, and the product was washed with ethanol and dried at 75° C. for 5 hours to obtain a polyester polyacid;

[0083] (4) polyester polyacid, citric acid, hydroxybenzotriazole, N,N-dimethylformamide, and p-toluenesulfonic acid are uniformly mixed in a mass ratio of 230:115:11:340:1, stirred at a stirring speed of 300 r / min, heated to 115° C., and reacted for 7 hours. After the reaction is completed, the solvent is removed by rotary evaporation, the product is washed with ethanol, and dried at 75° C. for 5 hours to obtain a hyperbranched polyester polyacid;

[0084] (5) The hyperbranched polyester polyacid, N,N-dimethylformamide, 1,6-hexanedithiol, and mercapto-modified nano titanium dioxide dispersion were uniformly mixed in a mass ratio of 345:260:145:75, triethylamine was added to adjust the pH value to 9, and the mixture was stirred at a stirring speed of 300 r / min and heated to 55° C., and reacted for 7 hours to obtain an anti-wrinkle color-preserving finishing agent;

[0085] (6) spinning cotton fiber and polyester fiber into warp yarn at a mass ratio of 60:40, spinning cotton fiber and polyester fiber into weft yarn at a mass ratio of 80:20, and spinning the warp yarn and the weft yarn into a blended fabric through a weaving process;

[0086] Among them, the warp yarn count is 40S, the weft yarn count is 40S; the warp density of the blended fabric is 550 yarns / 10cm, and the weft density is 320 yarns / 10cm;

[0087] (7) The anti-wrinkle and color-retaining finishing agent, sodium hypophosphite and water are uniformly mixed to prepare a finishing solution, and the blended fabric is immersed in the finishing solution, the bath ratio is 10:1, the immersion temperature is 45° C., the immersion time is 10 min, two immersions and two rollings, and the rolling rate is 100%, and the blended fabric after the immersion treatment is pre-baked at 80° C. for 10 min, and then baked at 150° C. for 5 min, washed three times, and oxidized by ventilation at room temperature to obtain an anti-wrinkle and color-retaining functional fabric;

[0088] Among them, the mass ratio of the anti-wrinkle and color-preserving finishing agent, sodium hypophosphite and water in the finishing liquid is 140:14:1000.

[0089] Example 4

[0090] This embodiment discloses a method for preparing a fabric with anti-wrinkle and color-retaining functions, comprising the following steps:

[0091] (1) 2-(2,4-dihydroxyphenyl)-2H-benzotriazole and N,N-dimethylformamide are mixed uniformly, anhydrous potassium carbonate is added, the temperature is raised to 70° C. at a stirring speed of 300 r / min, 4-bromo-1-butanol is added dropwise within 2 hours, the temperature is raised to 115° C. and the reaction is carried out for 2.5 hours after the addition is completed, a 3 mol / L hydrochloric acid aqueous solution is added after the reaction to adjust the pH value to 7, the solvent is removed by rotary evaporation, deionized water is added for washing, and the mixture is filtered. The filter residue and ethanol aqueous solution are heated to boiling at a mass ratio of 1:30 to dissolve the filter residue, and the mixture is filtered while hot. The filtrate is cooled and crystallized, filtered, and the resulting crystals are dried at 70° C. for 15 hours to obtain hydroxybenzotriazole;

[0092] The mass ratio of 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, N,N-dimethylformamide, anhydrous potassium carbonate and 4-bromo-1-butanol is 235:575:230:205, and the mass ratio of ethanol to water in the ethanol aqueous solution is 1:1;

[0093] (2) Mix nano-titanium dioxide and 90 wt% ethanol aqueous solution, add 1 mol / L hydrochloric acid aqueous solution to adjust the pH value to 4, and ultrasonically disperse at a frequency of 30 kHz for 30 minutes to obtain a nano-titanium dioxide dispersion, add 3-mercaptopropyltriethoxysilane dropwise, and complete the addition within 1 hour. Stir and heat to 60° C. at a stirring speed of 300 r / min, and react for 2.5 hours. After the reaction, filter, wash with ethanol, and vacuum dry at 55° C. for 9 hours to obtain mercapto-modified nano-titanium dioxide. Mix mercapto-modified nano-titanium dioxide and N,N-dimethylformamide in a mass ratio of 10:40, and ultrasonically disperse at a frequency of 30 kHz for 30 minutes to obtain a mercapto-modified nano-titanium dioxide dispersion;

[0094] Wherein, the mass ratio of nano titanium dioxide, 90wt% ethanol aqueous solution, and 3-mercaptopropyltriethoxysilane is 10:90:1.2;

[0095] (3) maleic acid, 2,2-dihydroxymethylpropionic acid, N,N-dimethylformamide, and p-toluenesulfonic acid were uniformly mixed in a mass ratio of 125:145:195:0.5, and the mixture was heated to 105° C. at a stirring speed of 300 r / min, and reacted for 2.5 hours. After the reaction was completed, the solvent was removed by rotary evaporation, and the product was washed with ethanol and dried at 75° C. for 5 hours to obtain a polyester polyacid;

[0096] (4) polyester polyacid, citric acid, hydroxybenzotriazole, N,N-dimethylformamide, and p-toluenesulfonic acid are uniformly mixed in a mass ratio of 240:115:18:350:1, stirred at a stirring speed of 300 r / min, heated to 115° C., and reacted for 7 hours. After the reaction is completed, the solvent is removed by rotary evaporation, the product is washed with ethanol, and dried at 75° C. for 5 hours to obtain a hyperbranched polyester polyacid;

[0097] (5) The hyperbranched polyester polyacid, N,N-dimethylformamide, 1,6-hexanedithiol, and mercapto-modified nano titanium dioxide dispersion were uniformly mixed in a mass ratio of 345:270:145:100, triethylamine was added to adjust the pH value to 9, and the mixture was stirred at a stirring speed of 300 r / min and heated to 55° C., and reacted for 7 hours to obtain an anti-wrinkle color-preserving finishing agent;

[0098] (6) spinning cotton fiber and polyester fiber into warp yarn at a mass ratio of 60:40, spinning cotton fiber and polyester fiber into weft yarn at a mass ratio of 80:20, and spinning the warp yarn and the weft yarn into a blended fabric through a weaving process;

[0099] Among them, the warp yarn count is 40S, the weft yarn count is 40S; the warp density of the blended fabric is 550 yarns / 10cm, and the weft density is 320 yarns / 10cm;

[0100] (7) The anti-wrinkle and color-retaining finishing agent, sodium hypophosphite and water are uniformly mixed to prepare a finishing solution, and the blended fabric is immersed in the finishing solution, the bath ratio is 10:1, the immersion temperature is 45° C., the immersion time is 10 min, two immersions and two rollings, and the rolling rate is 100%, and the blended fabric after the immersion treatment is pre-baked at 80° C. for 10 min, and then baked at 150° C. for 5 min, washed three times, and oxidized by ventilation at room temperature to obtain an anti-wrinkle and color-retaining functional fabric;

[0101] Among them, the mass ratio of the anti-wrinkle and color-preserving finishing agent, sodium hypophosphite and water in the finishing liquid is 160:16:1000.

[0102] Example 5

[0103] This embodiment discloses a method for preparing a fabric with anti-wrinkle and color-retaining functions, comprising the following steps:

[0104] (1) 2-(2,4-dihydroxyphenyl)-2H-benzotriazole and N,N-dimethylformamide are mixed uniformly, anhydrous potassium carbonate is added, the temperature is raised to 70° C. at a stirring speed of 300 r / min, 4-bromo-1-butanol is added dropwise within 2 hours, the temperature is raised to 120° C. and the reaction is carried out for 2 hours, 3 mol / L hydrochloric acid aqueous solution is added after the reaction to adjust the pH value to 7, the solvent is removed by rotary evaporation, deionized water is added for washing, and the mixture is filtered. The filter residue and ethanol aqueous solution are heated to boiling at a mass ratio of 1:30 to dissolve the filter residue, and the mixture is filtered while hot. The filtrate is cooled and crystallized, filtered, and the resulting crystals are dried at 80° C. for 12 hours to obtain hydroxybenzotriazole;

[0105] The mass ratio of 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, N,N-dimethylformamide, anhydrous potassium carbonate and 4-bromo-1-butanol is 240:600:240:210, and the mass ratio of ethanol to water in the ethanol aqueous solution is 1:1;

[0106] (2) Mix nano-titanium dioxide and 90 wt% ethanol aqueous solution, add 1 mol / L hydrochloric acid aqueous solution to adjust the pH value to 4, and ultrasonically disperse at a frequency of 40 kHz for 20 minutes to obtain a nano-titanium dioxide dispersion, add 3-mercaptopropyltriethoxysilane dropwise, and complete the addition within 1 hour. Stir and heat to 65° C. at a stirring speed of 300 r / min, and react for 2 hours. After the reaction, filter, wash with ethanol, and vacuum dry at 60° C. for 8 hours to obtain mercapto-modified nano-titanium dioxide. Mix mercapto-modified nano-titanium dioxide and N,N-dimethylformamide in a mass ratio of 10:40, and ultrasonically disperse at a frequency of 40 kHz for 20 minutes to obtain a mercapto-modified nano-titanium dioxide dispersion;

[0107] Wherein, the mass ratio of nano titanium dioxide, 90wt% ethanol aqueous solution, and 3-mercaptopropyltriethoxysilane is 10:90:1.5;

[0108] (3) maleic acid, 2,2-dihydroxymethylpropionic acid, N,N-dimethylformamide, and p-toluenesulfonic acid were uniformly mixed in a mass ratio of 130:120:200:0.5, and the mixture was heated to 110° C. at a stirring speed of 300 r / min, and reacted for 2 h. After the reaction was completed, the solvent was removed by rotary evaporation, and the product was washed with ethanol and dried at 80° C. for 4 h to obtain a polyester polyacid;

[0109] (4) polyester polyacid, citric acid, hydroxybenzotriazole, N,N-dimethylformamide, and p-toluenesulfonic acid are uniformly mixed in a mass ratio of 250:120:18:360:1, stirred at a stirring speed of 300 r / min, heated to 120° C., and reacted for 6 hours. After the reaction is completed, the solvent is removed by rotary evaporation, the product is washed with ethanol, and dried at 80° C. for 4 hours to obtain a hyperbranched polyester polyacid;

[0110] (5) The hyperbranched polyester polyacid, N,N-dimethylformamide, 1,6-hexanedithiol, and mercapto-modified nano titanium dioxide dispersion were uniformly mixed in a mass ratio of 370:280:150:100, triethylamine was added to adjust the pH value to 9, and the mixture was heated to 60° C. at a stirring speed of 300 r / min and reacted for 6 h to obtain an anti-wrinkle and color-retaining finishing agent;

[0111] (6) spinning cotton fiber and polyester fiber into warp yarn at a mass ratio of 60:40, spinning cotton fiber and polyester fiber into weft yarn at a mass ratio of 80:20, and spinning the warp yarn and the weft yarn into a blended fabric through a weaving process;

[0112] Among them, the warp yarn count is 40S, the weft yarn count is 40S; the warp density of the blended fabric is 550 yarns / 10cm, and the weft density is 320 yarns / 10cm;

[0113] (7) The anti-wrinkle and color-retaining finishing agent, sodium hypophosphite and water are uniformly mixed to prepare a finishing solution, and the blended fabric is immersed in the finishing solution, the bath ratio is 10:1, the immersion temperature is 45° C., the immersion time is 10 min, two immersions and two rollings, and the rolling rate is 100%, and the blended fabric after the immersion treatment is pre-baked at 80° C. for 10 min, and then baked at 150° C. for 5 min, washed three times, and oxidized by ventilation at room temperature to obtain an anti-wrinkle and color-retaining functional fabric;

[0114] The mass ratio of the anti-wrinkle and color-preserving finishing agent, sodium hypophosphite and water in the finishing liquid is 180:18:1000.

[0115] Comparative Example 1

[0116] This comparative example discloses a method for preparing a fabric with anti-wrinkle function, comprising the following steps:

[0117] (3) maleic acid, 2,2-dihydroxymethylpropionic acid, N,N-dimethylformamide, and p-toluenesulfonic acid were uniformly mixed in a mass ratio of 115:105:185:0.5, and the mixture was heated to 105° C. at a stirring speed of 300 r / min, and reacted for 2.5 hours. After the reaction was completed, the solvent was removed by rotary evaporation, and the product was washed with ethanol and dried at 75° C. for 5 hours to obtain a polyester polyacid;

[0118] (4) polyester polyacid, citric acid, N,N-dimethylformamide, and p-toluenesulfonic acid were uniformly mixed in a mass ratio of 220:115:330:1, stirred at a stirring speed of 300 r / min, heated to 115° C., and reacted for 7 h. After the reaction was completed, the solvent was removed by rotary evaporation, the product was washed with ethanol, and dried at 75° C. for 5 h to obtain a hyperbranched polyester polyacid;

[0119] (5) Mixing hyperbranched polyester polyacid, N,N-dimethylformamide, and 1,6-hexanedithiol in a mass ratio of 345:325:145, adding triethylamine to adjust the pH value to 9, stirring at a stirring speed of 300 r / min and heating to 55° C., reacting for 7 hours, and obtaining an anti-wrinkle color-preserving finishing agent;

[0120] (6) spinning cotton fiber and polyester fiber into warp yarn at a mass ratio of 60:40, spinning cotton fiber and polyester fiber into weft yarn at a mass ratio of 80:20, and spinning the warp yarn and the weft yarn into a blended fabric through a weaving process;

[0121] Among them, the warp yarn count is 40S, the weft yarn count is 40S; the warp density of the blended fabric is 550 yarns / 10cm, and the weft density is 320 yarns / 10cm;

[0122] (7) The anti-wrinkle finishing agent, sodium hypophosphite and water are mixed evenly to prepare a finishing solution, and the blended fabric is immersed in the finishing solution, the bath ratio is 10:1, the immersion temperature is 45° C., the immersion time is 10 min, two immersions and two rollings, and the rolling rate is 100%, and the blended fabric after the immersion treatment is pre-baked at 80° C. for 10 min, and then baked at 150° C. for 5 min, washed three times with water, and air-dried at room temperature to obtain an anti-wrinkle and color-retaining fabric;

[0123] Among them, the mass ratio of the anti-wrinkle finishing agent, sodium hypophosphite and water in the finishing liquid is 80:8:1000.

[0124] Comparative Example 2

[0125] This comparative example discloses a method for preparing a fabric with anti-wrinkle and color-retaining functions, comprising the following steps:

[0126] (1) 2-(2,4-dihydroxyphenyl)-2H-benzotriazole and N,N-dimethylformamide are mixed uniformly, anhydrous potassium carbonate is added, the temperature is raised to 70°C at a stirring speed of 300 r / min, 4-bromo-1-butanol is added dropwise within 2 hours, the temperature is raised to 115°C and the reaction is carried out for 2.5 hours after the addition is completed, a 3 mol / L hydrochloric acid aqueous solution is added after the reaction to adjust the pH value to 7, the solvent is removed by rotary evaporation, deionized water is added for washing, and the mixture is filtered. The filter residue and ethanol aqueous solution are heated to boiling at a mass ratio of 1:30 to dissolve the filter residue, and the mixture is filtered while hot. The filtrate is cooled and crystallized, filtered, and the resulting crystals are dried at 70°C for 15 hours to obtain hydroxybenzotriazole;

[0127] The mass ratio of 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, N,N-dimethylformamide, anhydrous potassium carbonate and 4-bromo-1-butanol is 225:525:210:205, and the mass ratio of ethanol to water in the ethanol aqueous solution is 1:1;

[0128] (2) Mix nano-titanium dioxide and 90 wt% ethanol aqueous solution, add 1 mol / L hydrochloric acid aqueous solution to adjust the pH value to 4, and ultrasonically disperse at a frequency of 30 kHz for 30 minutes to obtain a nano-titanium dioxide dispersion, add n-hexyltriethoxysilane dropwise, and complete the addition within 1 hour. Stir and heat to 60° C. at a stirring speed of 300 r / min, and react for 2.5 hours. After the reaction, filter, wash with ethanol, and vacuum dry at 55° C. for 9 hours to obtain surface-modified nano-titanium dioxide. Mix the surface-modified nano-titanium dioxide and N,N-dimethylformamide in a mass ratio of 10:40, and ultrasonically disperse at a frequency of 30 kHz for 30 minutes to obtain a surface-modified nano-titanium dioxide dispersion;

[0129] Wherein, the mass ratio of nano titanium dioxide, 90wt% ethanol aqueous solution, and n-hexyltriethoxysilane is 10:90:0.5;

[0130] (3) 1,4-butanediol, 2,2-dimethylolpropionic acid, N,N-dimethylformamide and p-toluenesulfonic acid were uniformly mixed in a mass ratio of 115:105:185:0.5, and the mixture was heated to 105° C. at a stirring speed of 300 r / min, and reacted for 2.5 h. After the reaction was completed, the solvent was removed by rotary evaporation, and the product was washed with ethanol and dried at 75° C. for 5 h to obtain a polyester polyacid;

[0131] (4) polyester polyacid, citric acid, hydroxybenzotriazole, N,N-dimethylformamide, and p-toluenesulfonic acid are uniformly mixed in a mass ratio of 220:115:11:330:1, stirred at a stirring speed of 300 r / min, heated to 115° C., and reacted for 7 hours. After the reaction is completed, the solvent is removed by rotary evaporation, the product is washed with ethanol, and dried at 75° C. for 5 hours to obtain a hyperbranched polyester polyacid;

[0132] (5) The hyperbranched polyester polyacid, N,N-dimethylformamide, and surface-modified nano-titanium dioxide dispersion were uniformly mixed in a mass ratio of 345:395:75, triethylamine was added to adjust the pH value to 9, and the mixture was heated to 55° C. at a stirring speed of 300 r / min and reacted for 7 h to obtain an anti-wrinkle and color-retaining finishing agent;

[0133] (6) spinning cotton fiber and polyester fiber into warp yarn at a mass ratio of 60:40, spinning cotton fiber and polyester fiber into weft yarn at a mass ratio of 80:20, and spinning the warp yarn and the weft yarn into a blended fabric through a weaving process;

[0134] Among them, the warp yarn count is 40S, the weft yarn count is 40S; the warp density of the blended fabric is 550 yarns / 10cm, and the weft density is 320 yarns / 10cm;

[0135] (7) mixing an anti-wrinkle and color-retaining finishing agent, sodium hypophosphite and water to prepare a finishing solution, immersing the blended fabric in the finishing solution, with a bath ratio of 10:1, an immersion temperature of 45° C., an immersion time of 10 min, two immersions and two rollings, and a rolling rate of 100%, pre-baking the blended fabric after the immersion treatment at 80° C. for 10 min, then baking at 150° C. for 5 min, washing three times with water, and oxidizing with ventilation at room temperature to obtain an anti-wrinkle and color-retaining fabric;

[0136] The mass ratio of the anti-wrinkle and color-preserving finishing agent, sodium hypophosphite and water in the finishing liquid is 80:8:1000.

[0137] Comparative Example 3

[0138] This comparative example discloses a method for preparing a polyester-cotton blended fabric, comprising the following steps:

[0139] (1) spinning cotton fiber and polyester fiber into warp yarn at a mass ratio of 60:40, spinning cotton fiber and polyester fiber into weft yarn at a mass ratio of 80:20, and spinning the warp yarn and the weft yarn into a blended fabric through a weaving process;

[0140] Among them, the warp yarn count is 40S, the weft yarn count is 40S; the warp density of the blended fabric is 550 yarns / 10cm, and the weft density is 320 yarns / 10cm;

[0141] In all the above examples and comparative examples, 2-(2,4-dihydroxyphenyl)-2H-benzotriazole is from Shanghai Covalent Chemical Technology Co., Ltd., CAS No. 22607-31-4; 4-bromo-1-butanol is from Yantai Shengkailun Chemical Technology Co., Ltd.; potassium carbonate is from Shanghai Aladdin Biochemical Technology Co., Ltd., CAS No. 584-08-7; 3-mercaptopropyltriethoxysilane is from Jiangsu Pules Biotechnology Co., Ltd., CAS No. 14814-09-6; nano-titanium dioxide is from Hangzhou Zheming New Materials Co., Ltd., model VK-T25F; n-hexyltriethoxysilane is from Beijing Bailingwei Technology Co., Ltd., CAS No. 1816 6-37-5; maleic acid comes from Hubei Qifei Pharmaceutical Chemical Co., Ltd., CAS No. 110-16-7; 2,2-dihydroxymethylpropionic acid comes from Hunan Changsheng Chemical Co., Ltd., CAS No. 4767-03-7; citric acid comes from Suzhou Rongguang Chemical Co., Ltd., CAS No. 77-92-9; 1,6-hexanedithiol comes from Guangzhou Yuanda New Materials Co., Ltd., CAS No. 1191-43-1; pure cotton yarn comes from Shandong Huaqiang New Materials Co., Ltd., count 60S; polyester yarn comes from Jinzhou Yuanheng Textile Co., Ltd., Hebei Province, count 80S; sodium hypophosphite comes from Jiangsu Runfeng Synthetic Technology Co., Ltd., CAS No. 7681-53-0.

[0142] Test example

[0143] Test (1), wrinkle resistance test: The fabrics prepared in Examples 1-5 and Comparative Examples 1-3 were respectively recorded as fabrics 1-8. The wrinkle resistance test of fabrics 1-8 was carried out in accordance with GB / T 3819-1997 "Determination of Crease Recovery of Textile Fabrics - Recovery Angle Method" and GB / T 13769-2009 "Textile Fabrics - Test Method for Assessing the Appearance Smoothness of Fabrics after Washing". The wrinkle recovery angles before washing and after 50 home washings, and the appearance smoothness after 1 and 50 home washings were tested respectively. The test results are shown in Tables 1 and 2:

[0144] Table 1

[0145]

[0146] Table 2

[0147]

[0148] It can be seen from the test results of Table 1 and Table 2 that the wrinkle-resistant and color-retaining fabric of the present invention has excellent wrinkle-resistant performance and still has good wrinkle-resistant performance after multiple washings. It can be seen from fabrics 1-5 that with the increase of the content of the wrinkle-resistant and color-retaining finishing agent in the finishing liquid, the wrinkle recovery angle of the fabric also increases accordingly, but when the content of the wrinkle-resistant and color-retaining finishing agent is too much, the wrinkle recovery angle of the fabric increases gradually, indicating that the load of the wrinkle-resistant and color-retaining finishing agent on the fabric has been saturated; it can be seen from fabrics 6, fabrics 7 and fabrics 2 that the main role in the wrinkle-resistant ability of the fabric is the copolymer of maleic acid, 2,2-dihydroxymethylpropionic acid and citric acid, and has little to do with hydroxybenzotriazole, mercapto-modified nano titanium dioxide and 1,6-hexanedithiol; it can be seen from fabrics 8 and fabrics 2 that the wrinkle-resistant performance of the fabric after being finished with the wrinkle-resistant and color-retaining finishing agent is greatly improved.

[0149] Test (2), breaking strength retention test: The fabrics prepared in Examples 1-5 and Comparative Examples 1-3 were respectively recorded as fabrics 1-8, and the breaking strength retention rate of the fabrics after 50 times of unwashing and home washing was measured according to GB / T 3923.1-2013 "Tensile properties of textile fabrics - Part 1: Determination of breaking strength and elongation at break (strip method)" with fabric 8 as the benchmark. The test results are shown in Table 3:

[0150] Table 3

[0151]

[0152] It can be seen from the test results in Table 3 that the wrinkle-resistant and color-retaining fabric of the present invention has good tensile strength at break. It can be seen from fabrics 1-5 that with the increase of the content of the wrinkle-resistant and color-retaining finishing agent in the finishing liquid, the breaking strength retention rate of the fabric gradually decreases. This is because the hydroxyl group on the basic unit cellulose of the cotton fiber reacts with the carboxyl group in the wrinkle-resistant and color-retaining finishing agent to form a crosslink. As the degree of crosslinking increases, it is difficult for the molecules of the fabric to produce relative slippage, the flexibility decreases, and the breaking strength retention rate of the fabric decreases. It can be seen from fabrics 7 and fabric 2 that the breaking strength retention rate of the fabric is greatly reduced as the thiol content in the wrinkle-resistant and color-retaining finishing agent decreases. This is because when the fabric contains thiol, it can be converted into disulfide bonds, which ensures the strength of the fabric while taking into account flexibility. Therefore, the breaking strength retention rate of fabric 2 is higher than that of fabric 7.

[0153] Test (3), color retention performance test: The fabrics prepared in Examples 1-5 and Comparative Examples 1-3 were respectively recorded as fabrics 1-8, and the whiteness of fabrics 1-8 was measured according to GB / T 17644-2008 "Test Method for Whiteness and Chroma of Textile Fibers". Then, fabrics 1-8 were placed under ultraviolet light for 24 hours, taken out and left to stand for 2 hours, and then the whiteness of fabrics 1-8 after ultraviolet irradiation was measured. The test results are shown in Table 4:

[0154] Table 4

[0155]

[0156] It can be seen from the test results in Table 4 that the wrinkle-resistant and color-retaining fabric of the present invention has a good color-retaining effect. It can be seen from fabrics 1-5 that with the increase of the content of mercapto-modified nano titanium dioxide in the wrinkle-resistant and color-retaining finishing agent in the finishing liquid, the whiteness of the fabric increases slightly. This is because titanium dioxide itself is a whitening agent, and adding it to the fabric can slightly increase the whiteness of the fabric; it can be seen from fabric 6 and fabric 2 that after 24 hours of ultraviolet light irradiation, the whiteness of the fabric not containing hydroxybenzotriazole and mercapto-modified nano titanium dioxide decreases significantly. This is because hydroxybenzotriazole and nano titanium dioxide are both ultraviolet absorbers. The combination of the two in the fabric produces a synergistic effect, so that the fabric has better ultraviolet resistance, so the whiteness of the fabric decreases less.

[0157] Test (4), UV protection performance test: The fabrics prepared in Examples 1-5 and Comparative Examples 1-3 were respectively recorded as fabrics 1-8, and the UPF values ​​of fabrics 1-8 were measured in accordance with GB / T 18830-2009 "Evaluation of UV protection performance of textiles". The measurement results are shown in Table 5:

[0158] Table 5

[0159] Fabric 1 Fabric 2 Fabric 3 Noodles 4 Fabric 5 Fabric 6 Fabric 7 Fabric 8 UPF value 66.5 67.3 65.8 83.3 83.8 7.3 67.0 6.2

[0160] It can be seen from the test results in Table 5 that the wrinkle-resistant and color-retaining fabric of the present invention has good anti-ultraviolet performance; it can be seen from fabrics 1-6 that with the increase of the content of hydroxybenzotriazole and mercapto-modified nano titanium dioxide in the anti-wrinkle and color-retaining finishing agent in the finishing liquid, the anti-ultraviolet performance of the fabric is better. This is because hydroxybenzotriazole and nano titanium dioxide are both ultraviolet absorbers, which can effectively absorb ultraviolet rays, and in addition to being an ultraviolet absorber, nano titanium dioxide also has a certain refractive effect on ultraviolet rays. Compounding the two in the fabric can produce a synergistic effect, so that the fabric has good anti-ultraviolet performance.

[0161] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a fabric with anti-wrinkle and color-retaining functions, It is characterized in that The following steps are involved: Step (1), preparing hydroxybenzotriazole; Modification of 2-(2,4-dihydroxyphenyl)-2H-benzotriazole by 4-bromo-1-butanol to give hydroxybenzotriazole; Step (2), preparing an anti-wrinkle and color-preserving finishing agent; The hyperbranched polyester polyacid, N,N-dimethylformamide, 1,6-hexanedithiol and mercapto-modified nano titanium dioxide dispersion are mixed and reacted to obtain an anti-wrinkle color-preserving finishing agent; Wherein, the hyperbranched polyester polyacid is obtained by reacting polyester polyacid, citric acid, hydroxybenzotriazole and p-toluenesulfonic acid in a solvent; The preparation method of the polyester polyacid is as follows: Maleic acid, 2,2-dimethylolpropionic acid, N,N-dimethylformamide and p-toluenesulfonic acid are mixed, stirred and heated, reacted, and purified after the reaction to obtain a polyester polyacid; Step (3), preparing anti-wrinkle and color-retaining functional fabric; The wrinkle-resistant and color-retaining finishing agent is prepared into a finishing liquid, the fabric is immersed in the finishing liquid, and a double-immersion and double-rolling treatment is performed to obtain the wrinkle-resistant and color-retaining functional fabric; The fabric is blended from cotton fiber and polyester fiber.

2. A method for preparing a wrinkle-resistant and color-retaining fabric according to claim 1, It is characterized in that Step (1), preparing hydroxybenzotriazole; 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, N,N-dimethylformamide and anhydrous potassium carbonate are mixed evenly, stirred and heated, 4-bromo-1-butanol is added dropwise, and after the addition is completed, the temperature is continued to be raised to react, and after the reaction, the reaction is separated, purified and dried to obtain hydroxybenzotriazole; Step (2) preparing an anti-wrinkle and color-preserving finishing agent; Polyester polyacid preparation stage: Maleic acid, 2,2-dimethylolpropionic acid, N,N-dimethylformamide and p-toluenesulfonic acid are mixed, stirred and heated, reacted, and purified after the reaction to obtain a polyester polyacid; Hyperbranched polyester polyacid preparation stage: Mixing polyester polyacid, citric acid, hydroxybenzotriazole, solvent and p-toluenesulfonic acid, stirring and heating, reacting, and purifying after the reaction to obtain hyperbranched polyester polyacid; Wherein, the solvent includes N,N-dimethylformamide; Preparation stage of anti-wrinkle and color-retaining finishing agent: The hyperbranched polyester polyacid, N,N-dimethylformamide, 1,6-hexanedithiol, and mercapto-modified nano titanium dioxide dispersion are uniformly mixed, the pH is adjusted, and the mixture is reacted at a set temperature to obtain an anti-wrinkle and color-retaining finishing agent; Step (3), preparing anti-wrinkle and color-retaining functional fabric; Mixing an anti-wrinkle and color-retaining finishing agent, sodium hypophosphite and water to prepare a finishing liquid; Cotton fiber and polyester fiber are blended to make warp yarn and weft yarn respectively, the warp yarn and weft yarn are spun into blended fabric, the blended fabric is immersed in finishing liquid, double-immersed and double-rolled, baked, washed and air-dried to obtain wrinkle-resistant and color-retaining functional fabric.

3. The method for preparing a wrinkle-resistant and color-retaining fabric according to claim 2, It is characterized in that The heating temperature during the stirring and heating in step (1) is 70° C., the time for adding 4-bromo-1-butanol dropwise is 2 hours, the heating temperature during the continued heating is 110-120° C., and the reaction time is 2-3 hours; The mass ratio of 2-(2,4-dihydroxyphenyl)-2H-benzotriazole, N,N-dimethylformamide, anhydrous potassium carbonate and 4-bromo-1-butanol is (220-240):(500-600):(200-240):(200-210).

4. The method for preparing a wrinkle-resistant and color-retaining fabric according to claim 2, It is characterized in that In the step (2), the mass ratio of maleic acid, 2,2-dihydroxymethylpropionic acid, N,N-dimethylformamide, and p-toluenesulfonic acid is (110-130):(100-120):(180-200):0.5; the mass ratio of polyester polyacid, citric acid, hydroxybenzotriazole, N,N-dimethylformamide, and p-toluenesulfonic acid is (210-250):(110-120):(10-18):(320-360):1; the mass ratio of hyperbranched polyester polyacid, N,N-dimethylformamide, 1,6-hexanedithiol, and mercapto-modified nano titanium dioxide dispersion is (320-370):(240-280):(140-150):(75-100).

5. The method for preparing a fabric with anti-wrinkle and color-retaining functions according to claim 2, It is characterized in that In the step (2), In the preparation stage of polyester polyacid, the heating temperature during stirring and heating is 100-110°C and the reaction time is 2-3h; in the preparation stage of hyperbranched polyester polyacid, the heating temperature during stirring and heating is 110-120°C and the reaction time is 6-8h; in the preparation stage of anti-wrinkle and color-retaining finishing agent, the set temperature is 50-60°C and the reaction time is 6-8h; in the preparation stage of anti-wrinkle and color-retaining finishing agent, the pH value is adjusted to 9; The two purification operations in the polyester polyacid preparation stage and the hyperbranched polyester polyacid preparation stage are the same, including: removing the solvent by rotary evaporation, washing with ethanol, and drying at 70-80° C. for 4-6 hours.

6. The method for preparing a wrinkle-resistant and color-retaining fabric according to claim 2, It is characterized in that The mercapto-modified nano-titanium dioxide dispersion in step (2) is prepared by the following steps: Mixing nano-titanium dioxide and ethanol aqueous solution to obtain a mixture, adjusting the pH value of the mixture to 4, ultrasonically dispersing the mixture to obtain a nano-titanium dioxide dispersion, and dropping 3-mercaptopropyltriethoxysilane into the nano-titanium dioxide dispersion to react, filtering, washing, and drying after the reaction to obtain mercapto-modified nano-titanium dioxide; The mercapto-modified nano titanium dioxide and N,N-dimethylformamide are mixed and ultrasonically dispersed to obtain a mercapto-modified nano titanium dioxide dispersion.

7. The method for preparing a wrinkle-resistant and color-retaining fabric according to claim 6, It is characterized in that The mass ratio of nano titanium dioxide, ethanol aqueous solution and 3-mercaptopropyltriethoxysilane is 10:90:(0.1-1.5); The reaction conditions are 55-65°C for 2-3h; The mass ratio of mercapto-modified nano-titanium dioxide and N,N-dimethylformamide is 10:

40.

8. The method for preparing a wrinkle-resistant and color-retaining fabric according to claim 2, It is characterized in that In the step (3), the mass ratio of the anti-wrinkle and color-preserving finishing agent, sodium hypophosphite and water is (100-180):(10-18):1000.

9. The method for preparing a wrinkle-resistant and color-retaining fabric according to claim 2, It is characterized in that In the step (3), the mass ratio of cotton fiber to polyester fiber in the warp yarn is 60:40, the mass ratio of cotton fiber to polyester fiber in the weft yarn is 80:20, the count of the warp yarn is 40S, the count of the weft yarn is 40S, the warp density of the fabric is 500 strands / 100 cm, and the weft density is 320 strands / 10 cm; The bath ratio during impregnation was 10:1, the impregnation temperature was 45°C, the impregnation time was 10 min, and the baking conditions included pre-baking at 80°C for 10 min and then baking at 150°C for 5 min.

10. A fabric with anti-wrinkle and color-preserving function prepared by the method for preparing a fabric with anti-wrinkle and color-preserving function according to claim 1.

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