Anti-fouling and anti-wrinkle suit fabric

Abstract

A stain-resistant and wrinkle-resistant suit fabric, belonging to the technical field of suit fabrics, wherein the raw material of the suit fabric is cotton fiber, which is obtained by four steps of isocyanate prepolymer cross-linking, polycarboxylic acid cross-linking, modified nano-silica impregnation, and hydrophobic and oleophobic treatment; the stain-resistant and wrinkle-resistant suit fabric has a first wrinkle recovery angle of 415°~423° and a quick rebound of 410°~421°, a five-fold wrinkle recovery angle of 407°~417° and a quick rebound of 39 9°~409°, the wrinkle recovery angle after 10 times is 397°~411° for slow rebound, and 393°~402° for quick rebound, the wrinkle recovery angle after 30 times is 391°~406° for slow rebound, and 389°~408° for quick rebound, the water repellency of the fabric before washing is 5.0, the oil repellency is 5.0, and the stain removal is 5.0; after 30 cycles of washing, the water repellency is 5.0, the oil repellency is 4.5~5.0, and the stain removal is 4.5~5.0.

Description

Technical Field

[0001] The invention relates to an anti-fouling and anti-wrinkle suit fabric, belonging to the technical field of suit fabrics. Background Art

[0002] The accelerated pace of life has led to higher and higher requirements for easy-care clothing, especially for clothing commonly used in business occasions such as suits. People hope to develop a fabric that is easy to care for. This kind of suit fabric is not easily polluted by the environment or is particularly easy to clean after being polluted, and it is not easy to wrinkle and deform during long-term wear. That is, the suit fabric has very excellent anti-fouling and anti-wrinkle properties. Most business suit fabrics are made of pure wool fabric, which has the advantages of thin texture, clear texture, comfortable and soft feel, and elasticity. Moreover, after being tightly grasped and released, there are basically no wrinkles. It is a high-end suit, but its price cost is very high, far beyond the acceptance range of the general public. Therefore, the raw materials of suit fabrics are no longer limited to wool. Cotton, linen and silk materials are also gradually widely used in suit fabrics, especially cotton materials, which are favored by the general public because of their softness, moisture absorption, good breathability, good skin-friendliness and good warmth retention. However, the fiber molecules that make up cotton materials contain a large number of highly hydrophilic and highly polar hydroxyl groups, which make the fabrics made from them less water-repellent, oil-repellent and stain-resistant. In addition, the molecular structure of cotton fibers lacks elasticity and has poor toughness, making them particularly prone to wrinkling. Therefore, when cotton materials are used as suit fabrics, there is an urgent need to improve their anti-fouling and anti-wrinkle properties.

[0003] Chinese patent CN113389043A discloses a wrinkle-resistant and anti-fouling suit fabric and its preparation method. The invention first treats wool fiber with low-temperature plasma, mixes silver-loaded nano-silicon dioxide and chitosan, and then adds keratinase to obtain a modified nano-silicon dioxide chitosan mixture, then adds aziridine methoxy polyethylene glycol methacrylate copolymer and the modified nano-silicon dioxide chitosan mixture for cross-linking reaction to form a composite, and uses the composite to finish the plasma-treated wool fiber to obtain modified wool fiber, and then twists the modified wool fiber, spins, dyes, fixes, and weaves it to obtain wrinkle-resistant and anti-fouling suit fabric. The suit fabric obtained in this patent is made of wool fiber, which is expensive and not widely accepted by the market.

[0004] Chinese patent CN108385400A discloses a wrinkle-resistant and non-ironing suit fabric, which consists of a surface layer and an inner layer, and the surface layer and the inner layer are both connected by bonding; wherein the surface layer is a mulberry silk blended fabric that has been treated with wrinkle resistance, the inner layer is an adhesive / XLA fiber fabric, and the adhesive is a reinforced polyurethane adhesive. The adhesive fiber used in the suit fabric of this patent is similar to cotton fiber, but it is also mixed with other relatively expensive fibers. Moreover, the suit fabric obtained by this patent only has wrinkle resistance and no anti-fouling performance, which does not match the convenience of easy care.

[0005] As can be seen from the above, current suit fabrics, especially suit fabrics made of cotton fibers, are still susceptible to environmental pollution and have poor wrinkle resistance. Therefore, it is of great practical significance to develop a stain-resistant and wrinkle-resistant suit fabric to solve the common shortcomings of cotton fibers, such as poor stain resistance and wrinkle resistance. Summary of the invention

[0006] In view of the deficiencies in the above-mentioned prior art, the present invention provides a stain-resistant and wrinkle-resistant suit fabric to achieve the following invention objectives: to prepare a suit fabric with cotton fiber as raw material and excellent stain-resistant and wrinkle-resistant properties.

[0007] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0008] A stain-resistant and wrinkle-resistant suit fabric, wherein the raw material of the stain-resistant and wrinkle-resistant suit fabric is cotton fiber, and the fabric is obtained through four steps of isocyanate prepolymer cross-linking, polycarboxylic acid cross-linking, modified nano-silica impregnation, and hydrophobic and oleophobic treatment;

[0009] The following are further improvements to the above technical solution:

[0010] Step 1: Cross-linking of isocyanate prepolymer

[0011] Add isocyanate to the reactor, start stirring, turn on the vacuum pump to increase the temperature and keep the temperature constant at 100-120°C under vacuum, dehydrate for 1-2.5 hours, turn off the vacuum pump, continue to pass dry nitrogen protection, cool to 60-70°C, control the stirring rate to 500-800 rpm, drip the pre-dried and dehydrated terminal hydroxyl polybutadiene into the reactor, the dripping speed is fast at first and then slow, and sample and test at any time, use dibutylamine back titration method to monitor the molar amount of -NCO in the reactor in real time, until the molar amount of -NCO in the reactor drops to 0.45-0.55 of the initial molar amount, stop dripping the terminal hydroxyl polybutadiene, and continue After the reaction is continued at a constant temperature and stirred for 4 to 7 hours, the temperature is lowered to room temperature to obtain a terminal isocyanate prepolymer, and then sodium salt of dioctyl sulfonate succinate, tributyl phosphate and an organic solvent are added, and the mixture is stirred and mixed to form an isocyanate prepolymer impregnation liquid. Then, a one-immersion and one-rolling process is adopted to immerse the cotton fiber base fabric in the isocyanate prepolymer impregnation liquid for 30 to 60 minutes, and then the excess liquid is rolled out, and the rolling rate is controlled at 75 to 85%. Then, the cotton fiber base fabric after impregnation is pre-baked at 60 to 70° C. for 30 to 45 minutes, and then the temperature is raised to 100 to 120° C. and baked for 15 to 25 minutes to obtain a cotton fiber base fabric cross-linked with the isocyanate prepolymer;

[0012] The isocyanate is one of toluene diisocyanate and diphenylmethane diisocyanate;

[0013] The terminal hydroxyl polybutadiene is a colorless to light yellow transparent liquid with a hydroxyl value of 0.7-0.8 mmol / g and a number average molecular weight of 2.7-3.3×10 3 g / mol, the viscosity at 40°C is 3~3.5Pa·s;

[0014] The organic solvent is one of chloroform, toluene and methyl ethyl ketone;

[0015] In the isocyanate prepolymer impregnation liquid, the mass ratio of the terminal isocyanate prepolymer, the sodium salt of dioctyl sulfonated succinate, tributyl phosphate and the organic solvent is 20-40:2-5:0.2-0.8:100-160.

[0016] Step 2: Polycarboxylic acid cross-linking

[0017] The polycarboxylic acid, sodium hypophosphite, isooctyl phosphate and deionized water are mixed and stirred evenly to prepare a mixed solution, and the cotton fiber base fabric cross-linked with isocyanate prepolymer is subjected to polycarboxylic acid cross-linking treatment by a double dipping and double rolling process, wherein the dipping temperature and time are controlled to be 50-70° C. for 10-25 minutes, and the rolling rate is controlled to be 80-85%. After the double dipping and double rolling are completed, the cotton fiber base fabric is pre-dried with hot air at 70-85° C. for 3-7 minutes, and then heated to 90-120° C. for baking for 5-10 minutes, and then washed with deionized water, and then dried with hot air at 80-100° C. for 2-5 minutes to obtain a secondary cross-linked cotton fiber base fabric;

[0018] In the mixed solution, the mass ratio of polycarboxylic acid, sodium hypophosphite, isooctyl phosphate and deionized water is 20-50:1-4:0.8-2:150-230;

[0019] The polycarboxylic acid is one of tannic acid, citric acid, butanetetracarboxylic acid and tartaric acid.

[0020] Step 3: Impregnation of modified nano-silica

[0021] After the modified nano-silicon dioxide, sodium alginate and deionized water are mixed, the modified nano-silicon dioxide is vigorously stirred and dispersed by a high-speed disperser until the particle size of the modified nano-silicon dioxide in the mixed liquid is 30-200 nm, and a modified nano-silicon dioxide impregnation liquid is obtained. The cotton fiber base fabric with secondary cross-linking is impregnated and rolled by a two-impregnation and two-rolling process, and the impregnation temperature and time are controlled to be 70-90° C. for 15-30 minutes, and the rolling rate is controlled to be 80-88%. After the two-impregnation and two-rolling are completed, the cotton fiber base fabric is dried with hot air at 80-90° C. for 5-15 minutes to obtain the cotton fiber base fabric impregnated with the modified nano-silicon dioxide;

[0022] The preparation method of the modified nano silicon dioxide is as follows: after mixing nano silicon dioxide and anhydrous ethanol, adding them into a high-speed disperser, vigorously stirring and dispersing until the average particle size of the nano silicon dioxide is 50-100nm, then controlling the stirring rate at 1000-2000 rpm, heating and keeping the temperature at 50-70°C, adding aminopropyl triethoxysilane, stirring and reacting at a constant temperature for 5-9 hours under condensation reflux, centrifuging, washing the separated solid with anhydrous ethanol for 2-3 times, and drying in a vacuum oven at 40-60°C for 4-8 hours to obtain the modified nano silicon dioxide;

[0023] The particle size of the nano silicon dioxide is 10-30 nm;

[0024] The mass ratio of the nano-silicon dioxide, anhydrous ethanol and aminopropyltriethoxysilane is 10-30:180-260:1-8;

[0025] The number average molecular weight of the sodium alginate is 25000-35000 g / mol;

[0026] In the modified nano-silicon dioxide impregnation solution, the mass ratio of modified nano-silicon dioxide, sodium alginate and deionized water is 10-25:0.5-1.5:150-300.

[0027] Step 4: Hydrophobic and oleophobic treatment

[0028] Alkyl ketene dimer, hexamethyldisilazane, fatty alcohol polyoxyethylene ether JFC-E and chloroform are mixed and stirred evenly to prepare a uniform and stable impregnation solution, and a one-dipping and one-rolling process is used to perform hydrophobic and oleophobic treatment on the cotton fiber base fabric impregnated with modified nano-silicon dioxide, and the impregnation temperature and time are controlled to be 40-55° C. for 25-40 minutes, and the rolling rate is controlled to be 75-80%. After the impregnation and rolling is completed, the base fabric is hot-dried at 60-70° C. for 15-25 minutes to remove the residual chloroform solvent in the base fabric, and then washed twice with deionized water, and then dried with hot air at 80-100° C. for 4-8 minutes to obtain a stain-resistant and wrinkle-resistant suit fabric;

[0029] In the impregnation solution, the mass ratio of alkyl ketene dimer, hexamethyldisilazane, fatty alcohol polyoxyethylene ether JFC-E, and chloroform is 15-45:3-15:0.5-1.3:90-150.

[0030] Compared with the prior art, the present invention achieves the following beneficial effects:

[0031] 1. The present invention designs a two-step chemical crosslinking treatment, namely isocyanate prepolymer crosslinking and polycarboxylic acid crosslinking, and combines the chemical adsorption and chemical bonding of modified nano-silica on the surface of cotton fibers to improve the wrinkle resistance of cotton fibers. The terminal hydroxyl polybutadiene in the crosslinking reaction of isocyanate prepolymer is a rubber elastomer. After the crosslinking reaction, it can improve the elasticity and toughness between the polymer segments of cotton fibers, giving the suit fabric very excellent resilience. In addition, the polycarboxylic acid crosslinking uses polycarboxylic acids with very high functionality, which greatly increases the crosslinking density between the polymer segments of cotton fibers and improves the stiffness and strength of cotton fibers. In addition, the adsorption and bonding of modified nano-silica on the polymer segments on the surface of cotton fibers also improves the mechanical strength of the cotton fiber molecular chains. The superposition of the above three treatment methods makes the suit fabric have extremely excellent wrinkle resistance, and the wrinkle resistance of the fabric does not show any signs of attenuation after multiple cycles of washing;

[0032] 2. The two substances, alkyl ketene dimer and hexamethyldisilazane, used in the hydrophobic and oleophobic treatment step of the present invention, are very easy to react with functional groups with active hydrogen, such as hydroxyl, carboxyl, amino, and ester groups, to generate a hydrophobic and oleophobic surface, so that the cotton fiber has very excellent water-repellent, oil-repellent and easy-to-decontaminate properties. After the hexamethyldisilazane reacts, the surface of the cotton fiber is covered with organic silicon functional groups, and these organic silicon functional group structures give the fiber very high oil-repellent properties;

[0033] 3. In the modified nano-silica impregnation step of the present invention, after the modified nano-silica is adsorbed and bonded on the cotton fiber surface, the roughness of the fiber surface can be increased, which provides considerable advantages for the subsequent hydrophobic and oleophobic treatment, because the rough surface can increase the reaction area of ​​the two substances, alkyl ketene dimer and hexamethyldisilazane, so that the two substances are more closely combined with the cotton fiber surface, thereby ensuring the durability of the fabric's hydrophobic and oleophobic anti-pollution properties;

[0034] 4. The anti-fouling and anti-wrinkle suit fabric obtained by the present invention has a first wrinkle recovery angle of 415°~423° and a quick rebound of 410°~421°; a 5th wrinkle recovery angle of 407°~417° and a quick rebound of 399°~409°; a 10th wrinkle recovery angle of 397°~411° and a quick rebound of 393°~402°; a 30th wrinkle recovery angle of 391°~406° and a quick rebound of 389°~408°; the fabric has a water repellency of 5.0, an oil repellency of 5.0 and a easy decontamination of 5.0 before washing; and a water repellency of 5.0, an oil repellency of 4.5~5.0 and an easy decontamination of 4.5~5.0 after 30 cycles of washing. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention are described below. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0036] Example 1: A stain-resistant and wrinkle-resistant suit fabric

[0037] Step 1: Cross-linking of isocyanate prepolymer

[0038] Add isocyanate to the reactor, start stirring, turn on the vacuum pump to raise the temperature and keep the temperature constant to 115°C under vacuum state, dehydrate for 2 hours, turn off the vacuum pump, continue to pass dry nitrogen protection, cool to 66°C, control the stirring rate to 600 rpm, and drip the pre-dried and dehydrated terminal hydroxyl polybutadiene into the reactor. The dripping speed is fast at first and then slow, and sampling is carried out at any time. The molar amount of -NCO in the reactor is monitored in real time by dibutylamine back titration method. When the molar amount of -NCO in the reactor drops to 0.5 of the initial molar amount, stop dripping the terminal hydroxyl polybutadiene, and continue After the reaction was continued at a constant temperature and stirred for 5 hours, the temperature was lowered to room temperature to obtain a terminal isocyanate prepolymer, and then sodium salt of dioctyl sulfonate succinate, tributyl phosphate and an organic solvent were added, and the mixture was stirred and mixed to form an isocyanate prepolymer impregnation liquid. Then, a one-immersion and one-rolling process was adopted to immerse the cotton fiber base cloth in the isocyanate prepolymer impregnation liquid for 50 minutes and then the excess liquid was rolled out, and the rolling rate was controlled at 82%. Then, the cotton fiber base cloth after impregnation was pre-baked at 67° C. for 40 minutes, and then the temperature was raised to 105° C. and baked for 20 minutes to obtain an isocyanate prepolymer cross-linked cotton fiber base cloth;

[0039] The isocyanate is toluene diisocyanate;

[0040] The terminal hydroxyl polybutadiene is a colorless to light yellow transparent liquid with a hydroxyl value of 0.76 mmol / g and a number average molecular weight of 2.9×10 3 g / mol, and the viscosity at 40°C is 3.2 Pa·s;

[0041] The organic solvent is chloroform;

[0042] In the isocyanate prepolymer impregnation liquid, the mass ratio of the terminal isocyanate prepolymer, the sodium salt of dioctyl sulfonate succinate, tributyl phosphate and the organic solvent is 26:3:0.6:150.

[0043] Step 2: Polycarboxylic acid cross-linking

[0044] The polycarboxylic acid, sodium hypophosphite, isooctyl phosphate and deionized water are mixed and stirred evenly to prepare a mixed solution, and the cotton fiber base fabric cross-linked with isocyanate prepolymer is subjected to polycarboxylic acid cross-linking treatment by a double dipping and double rolling process, wherein the dipping temperature and time are controlled to be 65° C. for 22 minutes, and the rolling rate is controlled to be 82%. After the double dipping and double rolling are completed, the cotton fiber base fabric is pre-baked with hot air at 79° C. for 6 minutes, and then heated to 110° C. for baking for 6 minutes, and then washed with deionized water, and then baked with hot air at 90° C. for 3 minutes to obtain a secondary cross-linked cotton fiber base fabric;

[0045] In the mixed solution, the mass ratio of polycarboxylic acid, sodium hypophosphite, isooctyl phosphate and deionized water is 40:3:1:200;

[0046] The polycarboxylic acid is tannic acid.

[0047] Step 3: Impregnation of modified nano-silica

[0048] After the modified nano-silicon dioxide, sodium alginate and deionized water are mixed, the modified nano-silicon dioxide is vigorously stirred and dispersed by a high-speed disperser until the particle size of the modified nano-silicon dioxide in the mixed liquid is 50 nm, and the modified nano-silicon dioxide impregnation liquid is obtained. The cotton fiber base fabric with secondary cross-linking is impregnated and rolled by a two-impregnation and two-rolling process. The impregnation temperature and time are controlled to be impregnated at 85° C. for 25 minutes, and the rolling rate is controlled to be 83%. After the two-impregnation and two-rolling are completed, the cotton fiber base fabric is dried with hot air at 86° C. for 11 minutes to obtain the cotton fiber base fabric impregnated with the modified nano-silicon dioxide;

[0049] The preparation method of the modified nano silicon dioxide is as follows: after mixing nano silicon dioxide and anhydrous ethanol, adding them into a high-speed disperser, vigorously stirring and dispersing them until the average particle size of the nano silicon dioxide is 80nm, then controlling the stirring rate to 1600 rpm, heating and keeping the temperature constant at 65°C, adding aminopropyl triethoxysilane, stirring and reacting at a constant temperature for 8 hours under condensation reflux, centrifuging, washing the separated solid with anhydrous ethanol twice, and drying it in a vacuum oven at 55°C for 7 hours to obtain the modified nano silicon dioxide;

[0050] The particle size of the nano silicon dioxide is 20 nm;

[0051] The mass ratio of the nano-silicon dioxide, anhydrous ethanol and aminopropyltriethoxysilane is 25:240:5;

[0052] The number average molecular weight of the sodium alginate is 28000 g / mol;

[0053] In the modified nano-silicon dioxide impregnation solution, the mass ratio of modified nano-silicon dioxide, sodium alginate and deionized water is 15:1:260.

[0054] Step 4: Hydrophobic and oleophobic treatment

[0055] Alkyl ketene dimer, hexamethyldisilazane, fatty alcohol polyoxyethylene ether JFC-E and chloroform are mixed and stirred evenly to prepare a uniform and stable impregnation solution, and the cotton fiber base fabric treated with modified nano-silicon dioxide is treated with hydrophobic and oleophobic treatment by a one-dipping and one-rolling process. The impregnation temperature and time are controlled to be 50°C for 35 minutes, and the rolling rate is controlled to be 78%. After the impregnation and rolling are completed, the base fabric is heated for 19 minutes under hot air at 66°C to remove the residual chloroform solvent in the base fabric, and then washed twice with deionized water, and then heated for 7 minutes with hot air at 95°C to obtain a stain-resistant and wrinkle-resistant suit fabric;

[0056] In the impregnation solution, the mass ratio of alkyl ketene dimer, hexamethyldisilazane, fatty alcohol polyoxyethylene ether JFC-E and chloroform is 30:7:0.9:120.

[0057] Example 2: A stain-resistant and wrinkle-resistant suit fabric

[0058] Step 1: Cross-linking of isocyanate prepolymer

[0059] Add isocyanate to the reactor, start stirring, turn on the vacuum pump to raise the temperature and keep the temperature constant to 100°C under vacuum, dehydrate for 1 hour, turn off the vacuum pump, continue to pass dry nitrogen protection, cool to 60°C, control the stirring rate to 500 rpm, drip the pre-dried and dehydrated terminal hydroxyl polybutadiene into the reactor, the dripping speed is fast at first and then slow, and sampling is carried out at any time. The molar amount of -NCO in the reactor is monitored in real time by dibutylamine back titration method until the molar amount of -NCO in the reactor drops to 0.45 of the initial molar amount, then stop dripping the terminal hydroxyl polybutadiene. After continuing the reaction at a constant temperature and stirring for 4 hours, the mixture was cooled to room temperature to obtain a terminal isocyanate prepolymer, and then sodium salt of dioctyl sulfonate succinate, tributyl phosphate and an organic solvent were added, and the mixture was stirred and mixed to form an isocyanate prepolymer impregnation liquid. Then, a one-immersion and one-rolling process was adopted to immerse the cotton fiber base fabric in the isocyanate prepolymer impregnation liquid for 30 minutes and then the excess liquid was rolled out, and the rolling rate was controlled to be 75%. Then, the cotton fiber base fabric after impregnation was pre-baked at 60° C. for 30 minutes, and then the temperature was raised to 100° C. and baked for 15 minutes to obtain an isocyanate prepolymer cross-linked cotton fiber base fabric;

[0060] The isocyanate is diphenylmethane diisocyanate;

[0061] The terminal hydroxyl polybutadiene is a colorless to light yellow transparent liquid with a hydroxyl value of 0.7 mmol / g and a number average molecular weight of 2.7×10 3 g / mol, and the viscosity at 40°C is 3 Pa·s;

[0062] The organic solvent is toluene;

[0063] In the isocyanate prepolymer impregnation liquid, the mass ratio of the terminal isocyanate prepolymer, the sodium salt of dioctyl sulfonate succinate, tributyl phosphate and the organic solvent is 20:2:0.2:100.

[0064] Step 2: Polycarboxylic acid cross-linking

[0065] The polycarboxylic acid, sodium hypophosphite, isooctyl phosphate and deionized water are mixed and stirred evenly to prepare a mixed solution, and the cotton fiber base fabric cross-linked with isocyanate prepolymer is subjected to polycarboxylic acid cross-linking treatment by a double dipping and double rolling process, wherein the dipping temperature and time are controlled to be 10 minutes at 50° C., and the rolling rate is controlled to be 80%. After the double dipping and double rolling are completed, the cotton fiber base fabric is pre-baked with hot air at 70° C. for 3 minutes, and then heated to 90° C. and baked for 5 minutes, and then washed with deionized water, and then baked with hot air at 80° C. for 2 minutes to obtain a secondary cross-linked cotton fiber base fabric;

[0066] In the mixed solution, the mass ratio of polycarboxylic acid, sodium hypophosphite, isooctyl phosphate and deionized water is 20:1:0.8:150;

[0067] The polycarboxylic acid is citric acid.

[0068] Step 3: Impregnation of modified nano-silica

[0069] After the modified nano-silicon dioxide, sodium alginate and deionized water are mixed, the modified nano-silicon dioxide is vigorously stirred and dispersed by a high-speed disperser until the particle size of the modified nano-silicon dioxide in the mixed liquid is 30 nm, and the modified nano-silicon dioxide impregnation liquid is obtained. The cotton fiber base fabric with secondary cross-linking is impregnated and rolled by a two-impregnation and two-rolling process. The impregnation temperature and time are controlled to be impregnated at 70° C. for 15 minutes, and the rolling rate is controlled to be 80%. After the two-impregnation and two-rolling are completed, the cotton fiber base fabric is dried with hot air at 80° C. for 5 minutes to obtain the cotton fiber base fabric impregnated with the modified nano-silicon dioxide;

[0070] The preparation method of the modified nano silicon dioxide is as follows: after mixing nano silicon dioxide and anhydrous ethanol, adding them into a high-speed disperser, vigorously stirring and dispersing until the average particle size of the nano silicon dioxide is 50nm, then controlling the stirring rate to 1000 rpm, heating and keeping the temperature constant at 50°C, adding aminopropyl triethoxysilane, stirring and reacting at a constant temperature for 5 hours under condensation reflux, centrifuging, washing the separated solid with anhydrous ethanol twice, and drying it in a vacuum oven at 40°C for 4 hours to obtain the modified nano silicon dioxide;

[0071] The particle size of the nano silicon dioxide is 10 nm;

[0072] The mass ratio of the nano-silicon dioxide, anhydrous ethanol and aminopropyltriethoxysilane is 10:180:1;

[0073] The number average molecular weight of the sodium alginate is 25000 g / mol;

[0074] In the modified nano-silicon dioxide impregnation solution, the mass ratio of modified nano-silicon dioxide, sodium alginate and deionized water is 10:0.5:150.

[0075] Step 4: Hydrophobic and oleophobic treatment

[0076] Alkyl ketene dimer, hexamethyldisilazane, fatty alcohol polyoxyethylene ether JFC-E and chloroform are mixed and stirred evenly to prepare a uniform and stable impregnation solution, and the cotton fiber base fabric treated with modified nano-silicon dioxide is treated with hydrophobic and oleophobic treatment by a one-immersion-one-rolling process. The impregnation temperature and time are controlled to be 40°C for 25 minutes, and the rolling rate is controlled to be 75%. After the impregnation and rolling are completed, the base fabric is heated for 15 minutes under hot air at 60°C to remove the residual chloroform solvent in the base fabric, and then washed twice with deionized water, and then heated for 4 minutes with hot air at 80°C to obtain a stain-resistant and wrinkle-resistant suit fabric;

[0077] In the impregnation solution, the mass ratio of alkyl ketene dimer, hexamethyldisilazane, fatty alcohol polyoxyethylene ether JFC-E and chloroform is 15:3:0.5:90.

[0078] Example 3: A stain-resistant and wrinkle-resistant suit fabric

[0079] Step 1: Cross-linking of isocyanate prepolymer

[0080] Add isocyanate to the reactor, start stirring, turn on the vacuum pump to increase the temperature and keep the temperature constant at 120°C, dehydrate for 2.5 hours, turn off the vacuum pump, continue to pass dry nitrogen protection, cool to 70°C, control the stirring rate to 800 rpm, and drip the pre-dried and dehydrated terminal hydroxyl polybutadiene into the reactor. The dripping speed is fast at first and then slow, and sampling is performed at any time. The molar amount of -NCO in the reactor is monitored in real time by dibutylamine back titration method until the molar amount of -NCO in the reactor drops to 0.55 of the initial molar amount, then stop dripping the terminal hydroxyl polybutadiene. , continue to stir and react at a constant temperature for 7 hours, then cool to room temperature to obtain a terminal isocyanate prepolymer, then add sodium salt of dioctyl sulfonate succinate, tributyl phosphate and an organic solvent, stir and mix evenly to prepare an isocyanate prepolymer impregnation liquid, then use a one-immersion-one-rolling process to immerse the cotton fiber base fabric in the isocyanate prepolymer impregnation liquid for 60 minutes and then roll out excess liquid, the rolling rate is controlled at 85%, and then the cotton fiber base fabric after the impregnation is pre-baked at 70°C for 45 minutes, and then heated to 120°C and baked for 25 minutes to obtain an isocyanate prepolymer cross-linked cotton fiber base fabric;

[0081] The isocyanate is toluene diisocyanate;

[0082] The terminal hydroxyl polybutadiene is a colorless to light yellow transparent liquid with a hydroxyl value of 0.8 mmol / g and a number average molecular weight of 3.3×10 3 g / mol, and the viscosity at 40°C is 3.5 Pa·s;

[0083] The organic solvent is methyl ethyl ketone;

[0084] In the isocyanate prepolymer impregnation liquid, the mass ratio of the terminal isocyanate prepolymer, the sodium salt of dioctyl sulfonate succinate, tributyl phosphate and the organic solvent is 40:5:0.8:160.

[0085] Step 2: Polycarboxylic acid cross-linking

[0086] The polycarboxylic acid, sodium hypophosphite, isooctyl phosphate and deionized water are mixed and stirred evenly to prepare a mixed solution, and the cotton fiber base fabric cross-linked with isocyanate prepolymer is subjected to polycarboxylic acid cross-linking treatment by a double dipping and double rolling process, wherein the dipping temperature and time are controlled to be 70° C. for 25 minutes, and the rolling rate is controlled to be 85%. After the double dipping and double rolling are completed, the cotton fiber base fabric is pre-baked with hot air at 85° C. for 7 minutes, and then heated to 120° C. for baking for 10 minutes, and then washed with deionized water, and then baked with hot air at 100° C. for 5 minutes to obtain a secondary cross-linked cotton fiber base fabric;

[0087] In the mixed solution, the mass ratio of polycarboxylic acid, sodium hypophosphite, isooctyl phosphate and deionized water is 50:4:2:230;

[0088] The polycarboxylic acid is butanetetracarboxylic acid.

[0089] Step 3: Impregnation of modified nano-silica

[0090] After the modified nano-silicon dioxide, sodium alginate and deionized water are mixed, the modified nano-silicon dioxide is vigorously stirred and dispersed by a high-speed disperser until the particle size of the modified nano-silicon dioxide in the mixed liquid is 200 nm, and the modified nano-silicon dioxide impregnation liquid is obtained. The cotton fiber base fabric with secondary cross-linking is impregnated and rolled by a two-impregnation and two-rolling process. The impregnation temperature and time are controlled to be impregnated at 90° C. for 30 minutes, and the rolling rate is controlled to be 88%. After the two-impregnation and two-rolling are completed, the cotton fiber base fabric is dried with hot air at 90° C. for 15 minutes to obtain the cotton fiber base fabric impregnated with the modified nano-silicon dioxide;

[0091] The preparation method of the modified nano silicon dioxide is as follows: after mixing nano silicon dioxide and anhydrous ethanol, adding them into a high-speed disperser, vigorously stirring and dispersing until the average particle size of the nano silicon dioxide is 100nm, then controlling the stirring rate to 2000 rpm, heating and keeping the temperature constant at 70°C, adding aminopropyl triethoxysilane, stirring and reacting at a constant temperature for 9 hours under condensation reflux, centrifuging, washing the separated solid with anhydrous ethanol for 3 times, and drying it in a vacuum oven at 60°C for 8 hours to obtain the modified nano silicon dioxide;

[0092] The particle size of the nano silicon dioxide is 30 nm;

[0093] The mass ratio of the nano-silicon dioxide, anhydrous ethanol and aminopropyltriethoxysilane is 30:260:8;

[0094] The number average molecular weight of the sodium alginate is 35000 g / mol;

[0095] In the modified nano-silicon dioxide impregnation solution, the mass ratio of modified nano-silicon dioxide, sodium alginate and deionized water is 25:1.5:300.

[0096] Step 4: Hydrophobic and oleophobic treatment

[0097] Alkyl ketene dimer, hexamethyldisilazane, fatty alcohol polyoxyethylene ether JFC-E and chloroform are mixed and stirred evenly to prepare a uniform and stable impregnation solution, and the cotton fiber base fabric treated with modified nano-silicon dioxide is treated with hydrophobic and oleophobic treatment by a one-dipping and one-rolling process. The impregnation temperature and time are controlled to be 55°C for 40 minutes, and the rolling rate is controlled to be 80%. After the impregnation and rolling are completed, the base fabric is heated for 25 minutes under hot air at 70°C to remove the residual chloroform solvent in the base fabric, and then washed twice with deionized water, and then heated for 8 minutes with hot air at 100°C to obtain a stain-resistant and wrinkle-resistant suit fabric;

[0098] In the impregnation solution, the mass ratio of alkyl ketene dimer, hexamethyldisilazane, fatty alcohol polyoxyethylene ether JFC-E and chloroform is 45:15:1.3:150.

[0099] Example 4: A stain-resistant and wrinkle-resistant suit fabric

[0100] Step 1: Cross-linking of isocyanate prepolymer

[0101] Add isocyanate to the reactor, start stirring, turn on the vacuum pump to increase the temperature and keep the temperature constant at 100°C, dehydrate for 2.5 hours, turn off the vacuum pump, continue to pass dry nitrogen protection, cool to 70°C, control the stirring rate to 580 rpm, and drip the pre-dried and dehydrated terminal hydroxyl polybutadiene into the reactor. The dripping speed is fast at first and then slow, and sampling is performed at any time. The molar amount of -NCO in the reactor is monitored in real time by dibutylamine back titration method until the molar amount of -NCO in the reactor drops to 0.55 of the initial molar amount, then stop dripping the terminal hydroxyl polybutadiene. , continue to stir and react at a constant temperature for 7 hours, then cool to room temperature to obtain a terminal isocyanate prepolymer, then add sodium salt of dioctyl sulfonate succinate, tributyl phosphate and an organic solvent, stir and mix evenly to prepare an isocyanate prepolymer impregnation liquid, then use a one-immersion-one-rolling process to immerse the cotton fiber base fabric in the isocyanate prepolymer impregnation liquid for 60 minutes and then roll out excess liquid, the rolling rate is controlled at 85%, and then the cotton fiber base fabric after the impregnation is pre-baked at 70°C for 45 minutes, and then heated to 120°C and baked for 25 minutes to obtain an isocyanate prepolymer cross-linked cotton fiber base fabric;

[0102] The isocyanate is diphenylmethane diisocyanate;

[0103] The terminal hydroxyl polybutadiene is a colorless to light yellow transparent liquid with a hydroxyl value of 0.8 mmol / g and a number average molecular weight of 3.3×10 3 g / mol, and the viscosity at 40°C is 3.5 Pa·s;

[0104] The organic solvent is methyl ethyl ketone;

[0105] In the isocyanate prepolymer impregnation liquid, the mass ratio of the terminal isocyanate prepolymer, the sodium salt of dioctyl sulfonate succinate, tributyl phosphate and the organic solvent is 40:2:0.8:160.

[0106] Step 2: Polycarboxylic acid cross-linking

[0107] The polycarboxylic acid, sodium hypophosphite, isooctyl phosphate and deionized water are mixed and stirred evenly to prepare a mixed solution, and the cotton fiber base fabric cross-linked with isocyanate prepolymer is subjected to polycarboxylic acid cross-linking treatment by a double dipping and double rolling process, wherein the dipping temperature and time are controlled to be 70° C. for 25 minutes, and the rolling rate is controlled to be 85%. After the double dipping and double rolling are completed, the cotton fiber base fabric is pre-baked with hot air at 85° C. for 7 minutes, and then heated to 120° C. for baking for 10 minutes, and then washed with deionized water, and then baked with hot air at 100° C. for 5 minutes to obtain a secondary cross-linked cotton fiber base fabric;

[0108] In the mixed solution, the mass ratio of polycarboxylic acid, sodium hypophosphite, isooctyl phosphate and deionized water is 50:4:2:230;

[0109] The polycarboxylic acid is tartaric acid.

[0110] Step 3: Impregnation of modified nano-silica

[0111] After the modified nano-silicon dioxide, sodium alginate and deionized water are mixed, the modified nano-silicon dioxide is vigorously stirred and dispersed by a high-speed disperser until the particle size of the modified nano-silicon dioxide in the mixed liquid is 30 nm, and the modified nano-silicon dioxide impregnation liquid is obtained. The cotton fiber base fabric with secondary cross-linking is impregnated and rolled by a two-impregnation and two-rolling process. The impregnation temperature and time are controlled to be impregnated at 70° C. for 15 minutes, and the rolling rate is controlled to be 80%. After the two-impregnation and two-rolling are completed, the cotton fiber base fabric is dried with hot air at 80° C. for 5 minutes to obtain the cotton fiber base fabric impregnated with the modified nano-silicon dioxide;

[0112] The preparation method of the modified nano silicon dioxide is as follows: after mixing nano silicon dioxide and anhydrous ethanol, adding them into a high-speed disperser, vigorously stirring and dispersing until the average particle size of the nano silicon dioxide is 50nm, then controlling the stirring rate to 2000 rpm, heating and keeping the temperature constant at 70°C, adding aminopropyl triethoxysilane, stirring and reacting at a constant temperature for 5 hours under condensation reflux, centrifuging, washing the separated solid with anhydrous ethanol for 3 times, and drying it in a vacuum oven at 40°C for 8 hours to obtain the modified nano silicon dioxide;

[0113] The particle size of the nano silicon dioxide is 10 nm;

[0114] The mass ratio of the nano-silicon dioxide, anhydrous ethanol and aminopropyltriethoxysilane is 30:180:8;

[0115] The number average molecular weight of the sodium alginate is 35000 g / mol;

[0116] In the modified nano-silicon dioxide impregnation solution, the mass ratio of modified nano-silicon dioxide, sodium alginate and deionized water is 25:1.5:300.

[0117] Step 4: Hydrophobic and oleophobic treatment

[0118] Alkyl ketene dimer, hexamethyldisilazane, fatty alcohol polyoxyethylene ether JFC-E and chloroform are mixed and stirred evenly to prepare a uniform and stable impregnation solution, and the cotton fiber base fabric treated with modified nano-silicon dioxide is treated with hydrophobic and oleophobic treatment by a one-dipping and one-rolling process. The impregnation temperature and time are controlled to be 55°C for 40 minutes, and the rolling rate is controlled to be 80%. After the impregnation and rolling are completed, the base fabric is heated for 25 minutes under hot air at 70°C to remove the residual chloroform solvent in the base fabric, and then washed twice with deionized water, and then heated for 8 minutes with hot air at 100°C to obtain a stain-resistant and wrinkle-resistant suit fabric;

[0119] In the impregnation solution, the mass ratio of alkyl ketene dimer, hexamethyldisilazane, fatty alcohol polyoxyethylene ether JFC-E and chloroform is 45:15:1.3:150.

[0120] Comparative Example 1: Based on Example 1, step 1, cross-linking of isocyanate prepolymer, is not performed, and other operations are the same as in Example 1. The specific operations are as follows:

[0121] Step 1, cross-linking of isocyanate prepolymer is not performed;

[0122] The operations of steps 2, 3 and 4 are the same as those of Example 1.

[0123] Comparative Example 2: Based on Example 1, step 2, cross-linking with polycarboxylic acid, is not performed, and other operations are the same as those in Example 1. The specific operations are as follows:

[0124] The operation of step 1 is the same as that of embodiment 1;

[0125] Step 2, polycarboxylic acid cross-linking, is not performed;

[0126] The operations of steps 3 and 4 are the same as those of Example 1.

[0127] Comparative Example 3: Based on Example 1, step 3, impregnation of modified nano-silicon dioxide, is not performed, and other operations are the same as in Example 1. The specific operations are as follows:

[0128] The operations of steps 1 and 2 are the same as those of Example 1;

[0129] Step 3, impregnation of modified nano-silicon dioxide, is not performed;

[0130] The operation of step 4 is the same as that of embodiment 1.

[0131] Comparative Example 4: Based on Example 1, step 4, hydrophobic and oleophobic treatment, is not performed, and other operations are the same as in Example 1. The specific operations are as follows:

[0132] The operations of steps 1, 2, and 3 are the same as those of Example 1;

[0133] Step 4, hydrophobic and oleophobic treatment, was not performed.

[0134] Comparative Example 5: Based on Example 1, step 4, hydrophobic and oleophobic treatment, no hexamethyldisilazane is added, 7 parts of hexamethyldisilazane are replaced by 7 parts of alkyl ketene dimer in equal amounts, and other operations are the same as in Example 1, and the specific operations are as follows:

[0135] The operations of steps 1, 2, and 3 are the same as those of Example 1;

[0136] Step 4: Hydrophobic and oleophobic treatment

[0137] Hexamethyldisilazane was not added, and 7 parts of hexamethyldisilazane were replaced by 7 parts of alkyl ketene dimer in equal amounts. Other operations were the same as in Example 1.

[0138] Performance Test:

[0139] The antifouling and anti-wrinkle suit fabrics obtained in Examples 1, 2, 3 and Comparative Examples 1, 2, 3, 4, and 5 were subjected to the following performance tests:

[0140] 1. Antifouling performance: refer to the American standards "AATCC193-2012 Water Repellency Test Water / Ethanol Solution Test", "AATCC118-2013 Oil Repellency: Hydrocarbon Resistance Test", and "AATCC130-2018 Decontamination: Oil Stain Removal Method" to test the water repellency, oil repellency and decontamination performance of the samples before washing and after 30 cycles of washing;

[0141] 2. Anti-wrinkle performance: The anti-fouling and anti-wrinkle suit fabrics obtained in Examples 1, 2, 3 and Comparative Examples 1, 2, 3, 4, and 5 were washed with clean water for 5 times, 10 times, and 30 times, respectively, and then dried in the sun. The slow-bounce and quick-bounce anti-folding recovery angles were tested according to AATCC66-2008 "Fabric Wrinkle Recovery: Recovery Angle Method".

[0142] The specific test results are shown in Table 1:

[0143] Table 1

[0144]

[0145] From the data in Table 1, it can be seen that the slow-elastic wrinkle recovery angle of Example 1 is 391°~415°, and the quick-elastic wrinkle recovery angle is 389°~410°, the slow-elastic wrinkle recovery angle of Example 2 is 397°~423°, and the quick-elastic wrinkle recovery angle is 393°~421°, the slow-elastic wrinkle recovery angle of Example 3 is 391°~416°, and the quick-elastic wrinkle recovery angle is 395°~413°, and the water-repellent, oil-repellent and easy-to-clean grades of Examples 1, 2, and 3 are all 4.5~5.0, which shows that the anti-fouling and anti-wrinkle suit fabrics obtained in the three examples have very excellent anti-fouling and anti-wrinkle properties; Comparative Example 1 does not perform isocyanate prepolymer cross-linking, and the vast majority of the slow-elastic wrinkle recovery angles and quick-elastic wrinkle recovery angles are Some test values ​​dropped to the worst state among all the embodiments and comparative examples, which shows that the cross-linking of isocyanate prepolymer plays the most critical role in improving the resilience of the fabric. The water repellency, oil repellency and easy decontamination levels of Comparative Example 1 are basically the same as those of the embodiments, which shows that the cross-linking of isocyanate prepolymer has basically no positive effect or negative impact on the anti-fouling performance of the fabric; Comparative Example 2 does not perform polycarboxylic acid cross-linking, and the slow-elastic wrinkle recovery angle and the quick-elastic wrinkle recovery angle of Comparative Example 2 are slightly better than those of Comparative Example 1, but are also significantly lower than those of Example 1, which shows that the cross-linking of polycarboxylic acid also plays a vital role in improving the elasticity and wrinkle resistance of the fabric. In addition, the water repellency, oil repellency and easy decontamination levels of Comparative Example 2 are significantly lower than those of Example 1. Example 1, which shows that polycarboxylic acid cross-linking also contributes to improving the anti-fouling performance of the fabric to a certain extent; Comparative Example 3 is not impregnated with modified nano-silica, and the slow-elastic wrinkle recovery angle and the quick-elastic wrinkle recovery angle of Comparative Example 3 are also significantly reduced, which shows that the modified nano-silica impregnation also has a considerable effect on improving the wrinkle resistance of the fabric, and the water-repellent, oil-repellent and easy-to-clean grades of Comparative Example 3 are also significantly reduced, which shows that modified nano-silica has a very positive effect on improving the hydrophobic and oleophobic properties of the surface of the fabric fiber; Comparative Example 4 is not treated with hydrophobic and oleophobic treatment, and the slow-elastic wrinkle recovery angle and the quick-elastic wrinkle recovery angle of Comparative Example 4 are slightly lower than those of Example 1, which may be due to the lack of hydrophobic and oleophobic treatment The cotton fiber fabric has a certain degree of hygroscopicity, which leads to a decrease in the wrinkle recovery angle. The anti-fouling performance of Comparative Example 4 drops to the worst value among all the embodiments and comparative examples, which shows that the hydrophobic and oleophobic treatment is the key to improving the anti-fouling performance of the fabric; Comparative Example 5, hydrophobic and oleophobic treatment, no hexamethyldisilazane is added, the slow-elastic wrinkle recovery angle and the quick-elastic wrinkle recovery angle of Comparative Example 5 are almost the same as those of Example 1, which shows that the hexamethyldisilazane in the hydrophobic and oleophobic treatment has no effect on the anti-wrinkle performance of the fabric, but compared with Example 1, the water-repellent, oil-repellent and easy-to-clean grades of Comparative Example 5, the oil-repellent grade has an extremely significant decrease, which shows that the addition of hexamethyldisilazane can greatly improve the oil-repellent performance of the fabric.

[0146] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A stain-resistant and wrinkle-resistant suit fabric, characterized in that: The raw material of the anti-fouling and anti-wrinkle suit fabric is cotton fiber, which is obtained through four steps of isocyanate prepolymer cross-linking, polycarboxylic acid cross-linking, modified nano-silica impregnation, and hydrophobic and oleophobic treatment; The isocyanate prepolymer is cross-linked, and the isocyanate is added to the reactor, and stirring is started. The vacuum pump is turned on to increase the temperature and maintain the temperature at 100-120° C. under vacuum state, and dehydrate for 1-2.5 hours. The vacuum pump is turned off, and the temperature is lowered to 60-70° C. under the protection of dry nitrogen. The stirring rate is controlled to be 500-800 rpm, and the terminal hydroxyl polybutadiene that has been dried and dehydrated in advance is dripped into the reactor. The dripping speed is first fast and then slow, and sampling is performed at any time. The molar amount of -NCO in the reactor is monitored in real time by the dibutylamine back titration method until the molar amount of -NCO in the reactor drops to 0.45-0.55 of the initial molar amount, and the dripping of the terminal hydroxyl polybutadiene is stopped. polybutadiene, continue to stir and react at a constant temperature for 4 to 7 hours, cool to room temperature to obtain a terminal isocyanate prepolymer, then add sodium salt of dioctyl sulfonate succinate, tributyl phosphate and an organic solvent, stir and mix evenly to prepare an isocyanate prepolymer impregnation liquid, then use a dipping and rolling process to immerse the cotton fiber base cloth in the isocyanate prepolymer impregnation liquid for 30 to 60 minutes and then roll out excess liquid, and control the rolling rate to 75 to 85%, and then pre-bake the cotton fiber base cloth after the impregnation at 60 to 70° C. for 30 to 45 minutes, and then heat it to 100 to 120° C. and bake it for 15 to 25 minutes to obtain an isocyanate prepolymer cross-linked cotton fiber base cloth; The isocyanate is one of toluene diisocyanate and diphenylmethane diisocyanate; The terminal hydroxyl polybutadiene is a colorless to light yellow transparent liquid with a hydroxyl value of 0.7-0.8 mmol / g and a number average molecular weight of 2.7-3.3×10 3 g / mol, the viscosity at 40°C is 3~3.5Pa·s; The polycarboxylic acid crosslinking comprises mixing polycarboxylic acid, sodium hypophosphite, isooctyl phosphate and deionized water and stirring them evenly to prepare a mixed solution, and adopting a double dipping and double rolling process to perform polycarboxylic acid crosslinking treatment on the cotton fiber base cloth crosslinked with the isocyanate prepolymer, wherein the dipping temperature and time are controlled to be 50-70° C. for 10-25 minutes, and the rolling rate is controlled to be 80-85%. After the double dipping and double rolling are completed, the cotton fiber base cloth is pre-baked with hot air at 70-85° C. for 3-7 minutes, and then heated to 90-120° C. for baking for 5-10 minutes, and then washed with deionized water, and then baked with hot air at 80-100° C. for 2-5 minutes to obtain a secondary crosslinked cotton fiber base cloth; The polycarboxylic acid is one of tannic acid, citric acid, butane tetracarboxylic acid and tartaric acid; The modified nano-silicon dioxide impregnation comprises mixing the modified nano-silicon dioxide, sodium alginate and deionized water, vigorously stirring and dispersing the mixture with a high-speed disperser, dispersing the modified nano-silicon dioxide in the mixed liquid to a particle size of 30-200 nm, obtaining a modified nano-silicon dioxide impregnation liquid, and performing an impregnation and padding treatment on the secondary cross-linked cotton fiber base fabric by a two-impregnation and two-rolling process, wherein the impregnation temperature and time are controlled to be 70-90° C. for 15-30 minutes, and the rolling rate is controlled to be 80-88%. After the two-impregnation and two-rolling are completed, the cotton fiber base fabric is dried with hot air at 80-90° C. for 5-15 minutes to obtain the cotton fiber base fabric impregnated with the modified nano-silicon dioxide; The preparation method of the modified nano silicon dioxide is as follows: after mixing nano silicon dioxide and anhydrous ethanol, adding them into a high-speed disperser, vigorously stirring and dispersing until the average particle size of the nano silicon dioxide is 50-100nm, then controlling the stirring rate at 1000-2000 rpm, heating and keeping the temperature at 50-70°C, adding aminopropyl triethoxysilane, stirring and reacting at a constant temperature for 5-9 hours under condensation reflux, centrifuging, washing the separated solid with anhydrous ethanol for 2-3 times, and drying in a vacuum oven at 40-60°C for 4-8 hours to obtain the modified nano silicon dioxide; The hydrophobic and oleophobic treatment comprises mixing alkyl ketene dimer, hexamethyldisilazane, fatty alcohol polyoxyethylene ether JFC-E and chloroform and stirring them evenly to prepare a uniform and stable impregnation solution, adopting a dipping and rolling process to perform hydrophobic and oleophobic treatment on the cotton fiber base cloth impregnated with modified nano-silicon dioxide, wherein the impregnation temperature and time are controlled to be 40-55° C. for 25-40 minutes, and the rolling rate is controlled to be 75-80%. After the dipping and rolling is completed, the base cloth is heat-dried at 60-70° C. for 15-25 minutes to dry out the chloroform solvent remaining in the base cloth, and then washed twice with deionized water, and then dried with hot air at 80-100° C. for 4-8 minutes to obtain a stain-resistant and wrinkle-resistant suit fabric.

2. The anti-fouling and anti-wrinkle suit fabric according to claim 1, characterized in that: The organic solvent is one of chloroform, toluene and methyl ethyl ketone; In the isocyanate prepolymer impregnation liquid, the mass ratio of the terminal isocyanate prepolymer, the sodium salt of dioctyl sulfonated succinate, tributyl phosphate and the organic solvent is 20-40:2-5:0.2-0.8:100-160.

3. The anti-fouling and anti-wrinkle suit fabric according to claim 1, characterized in that: In the mixed solution, the mass ratio of polycarboxylic acid, sodium hypophosphite, isooctyl phosphate and deionized water is 20-50:1-4:0.8-2:150-230.

4. The stain-resistant and wrinkle-resistant suit fabric according to claim 1, characterized in that: The particle size of the nano silicon dioxide is 10-30 nm; The mass ratio of the nano-silicon dioxide, anhydrous ethanol and aminopropyltriethoxysilane is 10-30:180-260:1-8; The number average molecular weight of the sodium alginate is 25000-35000 g / mol; In the modified nano-silicon dioxide impregnation solution, the mass ratio of modified nano-silicon dioxide, sodium alginate and deionized water is 10-25:0.5-1.5:150-300.

5. The stain-resistant and wrinkle-resistant suit fabric according to claim 1, characterized in that: In the impregnation solution, the mass ratio of alkyl ketene dimer, hexamethyldisilazane, fatty alcohol polyoxyethylene ether JFC-E, and chloroform is 15-45:3-15:0.5-1.3:90-150.

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