A water-repellent woven knitted fabric and preparation method thereof

Abstract

The invention discloses a water-repellent woven knitted fabric and a preparation method thereof, comprising the following steps: step S1: compounding woven fabric and base fabric based on needle punching technology to obtain woven knitted fabric; step S2: dipping the woven knitted fabric in a water-repellent finishing agent, rolling it with a rolling car after dipping, and drying it after double dipping and double rolling to obtain a water-repellent woven knitted fabric, wherein the water-repellent finishing agent is obtained by mixing a fluorine-free water-repellent agent, triethylene diamine, isomeric decanol polyoxyethylene ether, oleic acid polyethylene glycol diester and water. The water-repellent woven knitted fabric and the preparation method thereof described in the invention add a nano-alumina composite liquid to diisocyanate to enhance the wrinkle resistance of the fabric; the pre-treated camphor powder is added to the fluorine-free water-repellent agent to achieve a significant improvement in acid sweat color fastness.

Description

Technical Field

[0001] The invention relates to the technical field of knitted fabrics, and in particular to a water-repellent woven knitted fabric and a preparation method thereof. Background Art

[0002] Knitted fabrics are fabrics formed by bending yarns into loops and interlacing them with knitting needles. The difference between knitted fabrics and woven fabrics is that the yarns have different shapes in the fabrics. In order to take into account the strength, fastness, feel, appearance and other properties of woven fabrics, woven fabrics are compounded with knitted fabrics to obtain woven knitted fabrics. Because of their strong fastness and good feel, they are widely used in clothing fabrics and linings, home textiles and other products. In the face of the development of fabric functionality, although the existing fabrics have certain air permeability and water repellency, the color fastness of the fabrics, especially their sweat fastness, is poor. The fabrics are very easy to turn yellow due to the adhesion of sweat stains. In addition, the fabrics have poor wrinkle resistance, which affects the subsequent use of the fabrics. Summary of the invention

[0003] The main purpose of the present invention is to provide a water-repellent woven and knitted fabric and a preparation method thereof, which can effectively solve the problems in the background technology.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A method for preparing a water-repellent woven knitted fabric comprises the following steps:

[0006] Step S1: Compounding woven fabric and base fabric based on needle punching technology to obtain woven knitted fabric;

[0007] Step S2: dipping the woven knitted fabric in a water-repellent finishing agent, performing rolling and pressing after dipping, and drying after double dipping and double pressing to obtain a water-repellent woven knitted fabric, wherein the water-repellent finishing agent is obtained by stirring and mixing a fluorine-free water-repellent agent, triethylenediamine, isomeric decanol polyoxyethylene ether, oleic acid polyethylene glycol diester and water.

[0008] As a further optimization scheme of the present invention, the preparation process of the fluorine-free water repellent agent is as follows:

[0009] Add nano-alumina to silica sol, perform ultrasonic dispersion, dry, grind, calcine, then add propyltrimethoxysilane ethanol solution, stir to react, obtain nano-alumina composite liquid, mix diisocyanate, amine catalyst and nano-alumina composite liquid, stir to react, obtain solution A, dissolve saturated fatty acid in organic solvent to obtain solution B, add the obtained solution B dropwise into solution A, add reaction aid, carry out heat preservation reaction, and obtain.

[0010] As a further optimization scheme of the present invention, camphor powder is soaked in anhydrous ethanol of equal weight, and after mixing evenly, triallyl cyanurate and N-vinyl pyrrolidone are added, and after mixing, microwave reflux treatment is performed, and the mixture is kept warm and ground until the solvent evaporates to obtain pretreated camphor powder, and the pretreated camphor powder is added to the fluorine-free water-repellent agent to obtain a modified fluorine-free water-repellent agent.

[0011] As a further optimization scheme of the present invention, in step S2, the fluorine-free water-repellent agent is replaced by an equal amount of the modified fluorine-free water-repellent agent.

[0012] As a further optimization scheme of the present invention, the weight ratio of the camphor powder and the fluorine-free water repellent agent is 1:5, and the mass ratio of the camphor powder, triallyl cyanurate and N-vinyl pyrrolidine is (12-15):(1-2):(0.5-1).

[0013] As a further optimization scheme of the present invention, the microwave frequency of the microwave reflux treatment is 2200 MHz, and the microwave reflux treatment time is 10 min at an output power of 700 W.

[0014] As a further optimization scheme of the present invention, the water-repellent finishing agent includes, by weight, 2-4 parts of fluorine-free water-repellent agent, 0.1-0.3 parts of triethylenediamine, 1-2 parts of isomeric decanol polyoxyethylene ether, 1-2 parts of oleic acid polyethylene glycol diester and 45-55 parts of water.

[0015] As a further optimization scheme of the present invention, the SiO2 content in the silica sol in step S2 is 30%, the weight ratio of nano-alumina to silica sol is 1:(1.5-2.5), and the weight ratio of nano-alumina to propyltrimethoxysilane is 1:(1.2-1.4).

[0016] As a further optimization scheme of the present invention, the weight ratio of the diisocyanate, the amine catalyst and the nano-alumina composite liquid in step S2 is 1:(0.2-0.3):(0.6-0.8).

[0017] A water-repellent woven and knitted fabric is produced by the preparation method of the woven and knitted fabric.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] In the present invention, nano-alumina is added to silica sol, dispersed, dried, ground, calcined, and then reacted with an ethanol solution of propyltrimethoxysilane to obtain a nano-alumina composite liquid, and the nano-alumina composite liquid is added to diisocyanate to enhance the wrinkle resistance of the fabric; camphor powder is mixed with triallyl cyanurate and N-vinyl pyrrolidone, and the mixed liquid is subjected to microwave reflux treatment, so that the pre-treated camphor powder is added to a fluorine-free water-repellent agent, thereby achieving a significant improvement in acid perspiration color fastness. DETAILED DESCRIPTION

[0020] The present application is described in further detail below. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] Example 1

[0022] A method for preparing a water-repellent woven knitted fabric comprises the following steps:

[0023] Step S1: preparing a woven knitted fabric, using needle punching to make wool fibers on the woven fabric pass through the base fabric, so that the woven fabric and the base fabric are compounded together to form a woven knitted fabric;

[0024] Step S2: dipping the woven knitted fabric in a water-repellent finishing agent, performing rolling and pressing after dipping, and drying after double dipping and double pressing to obtain a water-repellent woven knitted fabric, wherein the water-repellent finishing agent is obtained by stirring and mixing a fluorine-free water-repellent agent, triethylene diamine, isomeric decanol polyoxyethylene ether, oleic acid polyethylene glycol diester and water, wherein the preparation process of the fluorine-free water-repellent agent is as follows:

[0025] The nano-alumina is added to the silica sol, ultrasonically dispersed, dried, ground, calcined, and then an ethanol solution of propyltrimethoxysilane is added, stirred and reacted to obtain a nano-alumina composite liquid, diisocyanate, an amine catalyst and the nano-alumina composite liquid are mixed, stirred and reacted to obtain a solution A, saturated fatty acids are dissolved in an organic solvent to obtain a solution B, the prepared solution B is added dropwise to the solution A, a reaction aid is added, and a heat preservation reaction is performed to obtain a silica sol having a SiO2 content of 30%, a weight ratio of nano-alumina to silica sol of 1:1.5, a weight ratio of nano-alumina to propyltrimethoxysilane of 1:1.2, a weight ratio of diisocyanate, amine catalyst and nano-alumina composite liquid of 1:0.2:0.6, and the water-repellent finishing agent includes, by weight, 3 parts of a fluorine-free water-repellent agent, 0.2 parts of triethylenediamine, 1 part of isomeric decanol polyoxyethylene ether, 1 part of oleic acid polyethylene glycol diester and 50 parts of water.

[0026] Example 2

[0027] A method for preparing a water-repellent woven knitted fabric comprises the following steps:

[0028] Step S1: preparing a woven knitted fabric, using needle punching to make wool fibers on the woven fabric pass through the base fabric, so that the woven fabric and the base fabric are compounded together to form a woven knitted fabric;

[0029] Step S2: dipping the woven knitted fabric in a water-repellent finishing agent, performing rolling and pressing after dipping, and drying after double dipping and double pressing to obtain a water-repellent woven knitted fabric, wherein the water-repellent finishing agent is obtained by stirring and mixing a fluorine-free water-repellent agent, triethylene diamine, isomeric decanol polyoxyethylene ether, oleic acid polyethylene glycol diester and water, wherein the preparation process of the fluorine-free water-repellent agent is as follows:

[0030] The nano-alumina is added to the silica sol, ultrasonically dispersed, dried, ground, calcined, and then an ethanol solution of propyltrimethoxysilane is added, stirred and reacted to obtain a nano-alumina composite liquid, diisocyanate, amine catalyst and nano-alumina composite liquid are mixed, stirred and reacted to obtain solution A, saturated fatty acid is dissolved in an organic solvent to obtain solution B, the prepared solution B is added dropwise to solution A, a reaction aid is added, and a heat preservation reaction is performed to obtain a silica sol having a SiO2 content of 30%, a weight ratio of nano-alumina to silica sol of 1:2.5, a weight ratio of nano-alumina to propyltrimethoxysilane of 1:1.4, a weight ratio of diisocyanate, amine catalyst and nano-alumina composite liquid of 1:0.3:0.8, and the water-repellent finishing agent includes, by weight, 3 parts of fluorine-free water-repellent agent, 0.2 parts of triethylene diamine, 1 part of isomeric decanol polyoxyethylene ether, 1 part of oleic acid polyethylene glycol diester and 50 parts of water.

[0031] Example 3

[0032] A method for preparing a water-repellent woven knitted fabric comprises the following steps:

[0033] Step S1: preparing a woven knitted fabric, using needle punching to make wool fibers on the woven fabric pass through the base fabric, so that the woven fabric and the base fabric are compounded together to form a woven knitted fabric;

[0034] Step S2: dipping the woven knitted fabric in a water-repellent finishing agent, performing rolling and pressing after dipping, and drying after double dipping and double pressing to obtain a water-repellent woven knitted fabric, wherein the water-repellent finishing agent is obtained by stirring and mixing a fluorine-free water-repellent agent, triethylene diamine, isomeric decanol polyoxyethylene ether, oleic acid polyethylene glycol diester and water, wherein the preparation process of the fluorine-free water-repellent agent is as follows:

[0035] The nano-alumina is added to the silica sol, ultrasonically dispersed, dried, ground, calcined, and then an ethanol solution of propyltrimethoxysilane is added, stirred and reacted to obtain a nano-alumina composite liquid, diisocyanate, an amine catalyst and the nano-alumina composite liquid are mixed, stirred and reacted to obtain a solution A, saturated fatty acids are dissolved in an organic solvent to obtain a solution B, the prepared solution B is added dropwise to the solution A, a reaction aid is added, and a heat preservation reaction is performed to obtain a silica sol having a SiO2 content of 30%, a weight ratio of nano-alumina to silica sol of 1:2, a weight ratio of nano-alumina to propyltrimethoxysilane of 1:1.3, a weight ratio of diisocyanate, amine catalyst and nano-alumina composite liquid of 1:0.25:0.7, and the water-repellent finishing agent includes, by weight, 3 parts of a fluorine-free water-repellent agent, 0.2 parts of triethylene diamine, 1 part of isomeric decanol polyoxyethylene ether, 1 part of oleic acid polyethylene glycol diester and 50 parts of water.

[0036] Example 4

[0037] A method for preparing a water-repellent woven knitted fabric comprises the following steps:

[0038] Step S1: preparing a woven knitted fabric, using needle punching to make wool fibers on the woven fabric pass through the base fabric, so that the woven fabric and the base fabric are compounded together to form a woven knitted fabric;

[0039] Step S2: dipping the woven knitted fabric in a water-repellent finishing agent, performing rolling and pressing after dipping, and drying after double dipping and double pressing to obtain a water-repellent woven knitted fabric, wherein the water-repellent finishing agent is obtained by stirring and mixing a modified fluorine-free water-repellent agent, triethylene diamine, isomeric decanol polyoxyethylene ether, oleic acid polyethylene glycol diester and water, wherein the preparation process of the modified fluorine-free water-repellent agent is as follows:

[0040] The nano-alumina is added to the silica sol, ultrasonically dispersed, dried, ground, calcined, and then an ethanol solution of propyltrimethoxysilane is added, stirred to react, and a nano-alumina composite liquid is obtained. The diisocyanate, the amine catalyst and the nano-alumina composite liquid are mixed, stirred to react, and a solution A is obtained. The saturated fatty acid is dissolved in an organic solvent to obtain a solution B. The prepared solution B is added dropwise to the solution A, a reaction aid is added, and a heat preservation reaction is performed to obtain camphor powder. The camphor powder is soaked in anhydrous ethanol of equal weight, and after mixing evenly, triallyl cyanurate and N-vinyl pyrrolidone are added. After mixing, a microwave reflux treatment is performed, and the mixture is heat-insulated and ground until the solvent evaporates to obtain a pretreated camphor powder. The pretreated camphor powder is added to a fluorine-free water-repellent agent to obtain a modified fluorine-free water-repellent agent, wherein the camphor powder The weight ratio of camphor powder to fluorine-free water-repellent agent is 1:5, the mass ratio of camphor powder, triallyl cyanurate and N-vinyl pyrrolidine is 12:1:0.5, the microwave frequency of microwave reflux treatment is 2200 MHz, the microwave reflux treatment time is 10 min at an output power of 700 W, the SiO2 content in silica sol is 30%, the weight ratio of nano alumina to silica sol is 1:2, the weight ratio of nano alumina to propyltrimethoxysilane is 1:1.3, the weight ratio of diisocyanate, amine catalyst and nano alumina composite liquid is 1:0.25:0.7, and the water-repellent finishing agent includes, by weight, 3 parts of fluorine-free water-repellent agent, 0.2 parts of triethylene diamine, 1 part of isomeric decanol polyoxyethylene ether, 1 part of oleic acid polyethylene glycol diester and 50 parts of water.

[0041] Example 5

[0042] A method for preparing a water-repellent woven knitted fabric comprises the following steps:

[0043] Step S1: preparing a woven knitted fabric, using needle punching to make wool fibers on the woven fabric pass through the base fabric, so that the woven fabric and the base fabric are compounded together to form a woven knitted fabric;

[0044] Step S2: dipping the woven knitted fabric in a water-repellent finishing agent, performing rolling and pressing after dipping, and drying after double dipping and double pressing to obtain a water-repellent woven knitted fabric, wherein the water-repellent finishing agent is obtained by stirring and mixing a modified fluorine-free water-repellent agent, triethylene diamine, isomeric decanol polyoxyethylene ether, oleic acid polyethylene glycol diester and water, wherein the preparation process of the modified fluorine-free water-repellent agent is as follows:

[0045] The nano-alumina is added to the silica sol, ultrasonically dispersed, dried, ground, calcined, and then an ethanol solution of propyltrimethoxysilane is added, stirred to react, and a nano-alumina composite liquid is obtained. The diisocyanate, the amine catalyst and the nano-alumina composite liquid are mixed, stirred to react, and a solution A is obtained. The saturated fatty acid is dissolved in an organic solvent to obtain a solution B. The prepared solution B is added dropwise to the solution A, a reaction aid is added, and a heat preservation reaction is performed to obtain camphor powder. The camphor powder is soaked in anhydrous ethanol of equal weight, and after mixing evenly, triallyl cyanurate and N-vinyl pyrrolidone are added. After mixing, a microwave reflux treatment is performed, and the mixture is heat-insulated and ground until the solvent evaporates to obtain a pretreated camphor powder. The pretreated camphor powder is added to a fluorine-free water-repellent agent to obtain a modified fluorine-free water-repellent agent, wherein the camphor The weight ratio of powder and fluorine-free water-repellent agent is 1:5, the mass ratio of camphor powder, triallyl cyanurate and N-vinyl pyrrolidine is 15:2:1, the microwave frequency of microwave reflux treatment is 2200MHz, the microwave reflux treatment time is 10min at an output power of 700W, the SiO2 content in silica sol is 30%, the weight ratio of nano alumina and silica sol is 1:2, the weight ratio of nano alumina and propyltrimethoxysilane is 1:1.3, the weight ratio of diisocyanate, amine catalyst and nano alumina composite liquid is 1:0.25:0.7, and the water-repellent finishing agent includes, by weight, 3 parts of fluorine-free water-repellent agent, 0.2 parts of triethylenediamine, 1 part of isomeric decanol polyoxyethylene ether, 1 part of oleic acid polyethylene glycol diester and 50 parts of water.

[0046] Example 6

[0047] A method for preparing a water-repellent woven knitted fabric comprises the following steps:

[0048] Step S1: preparing a woven knitted fabric, using needle punching to make wool fibers on the woven fabric pass through the base fabric, so that the woven fabric and the base fabric are compounded together to form a woven knitted fabric;

[0049] Step S2: dipping the woven knitted fabric in a water-repellent finishing agent, performing rolling and pressing after dipping, and drying after double dipping and double pressing to obtain a water-repellent woven knitted fabric, wherein the water-repellent finishing agent is obtained by stirring and mixing a modified fluorine-free water-repellent agent, triethylene diamine, isomeric decanol polyoxyethylene ether, oleic acid polyethylene glycol diester and water, wherein the preparation process of the modified fluorine-free water-repellent agent is as follows:

[0050] The nano-alumina is added to the silica sol, ultrasonically dispersed, dried, ground, calcined, and then an ethanol solution of propyltrimethoxysilane is added, stirred to react, and a nano-alumina composite liquid is obtained. The diisocyanate, the amine catalyst and the nano-alumina composite liquid are mixed, stirred to react, and a solution A is obtained. The saturated fatty acid is dissolved in an organic solvent to obtain a solution B. The prepared solution B is added dropwise to the solution A, a reaction aid is added, and a heat preservation reaction is performed to obtain camphor powder. The camphor powder is soaked in anhydrous ethanol of equal weight, and after mixing evenly, triallyl cyanurate and N-vinyl pyrrolidone are added. After mixing, a microwave reflux treatment is performed, and the mixture is heat-insulated and ground until the solvent evaporates to obtain a pretreated camphor powder. The pretreated camphor powder is added to a fluorine-free water-repellent agent to obtain a modified fluorine-free water-repellent agent, wherein the camphor powder and The weight ratio of the fluorine-free water-repellent agent is 1:5, the mass ratio of camphor powder, triallyl cyanurate and N-vinyl pyrrolidine is 14:1.5:0.8, the microwave frequency of the microwave reflux treatment is 2200 MHz, the microwave reflux treatment time is 10 min at an output power of 700 W, the SiO2 content in the silica sol is 30%, the weight ratio of nano alumina and silica sol is 1:2, the weight ratio of nano alumina and propyltrimethoxysilane is 1:1.3, the weight ratio of diisocyanate, amine catalyst and nano alumina composite liquid is 1:0.25:0.7, and the water-repellent finishing agent includes, by weight, 3 parts of fluorine-free water-repellent agent, 0.2 parts of triethylene diamine, 1 part of isomeric decanol polyoxyethylene ether, 1 part of oleic acid polyethylene glycol diester and 50 parts of water.

[0051] Comparative Example 1

[0052] A method for preparing a water-repellent woven knitted fabric comprises the following steps:

[0053] Step S1: preparing a woven knitted fabric, using needle punching to make wool fibers on the woven fabric pass through the base fabric, so that the woven fabric and the base fabric are compounded together to form a woven knitted fabric;

[0054] Step S2: dipping the woven knitted fabric in a water-repellent finishing agent, performing rolling and pressing after dipping, and drying after double dipping and double pressing to obtain a water-repellent woven knitted fabric, wherein the water-repellent finishing agent is obtained by stirring and mixing a modified fluorine-free water-repellent agent, triethylene diamine, isomeric decanol polyoxyethylene ether, oleic acid polyethylene glycol diester and water, wherein the preparation process of the modified fluorine-free water-repellent agent is as follows:

[0055] The diisocyanate is dissolved in an organic solvent to obtain a solution A, and a saturated fatty acid is dissolved in an organic solvent to obtain a solution B. The prepared solution B is added dropwise to the solution A, and a reaction aid is added, and the mixture is kept warm for reaction to obtain a fluorine-free water repellent agent. The camphor powder is soaked in anhydrous ethanol of equal weight, and after mixing, triallyl cyanurate and N-vinyl pyrrolidone are added, and after mixing, a microwave reflux treatment is performed, and the mixture is kept warm for grinding until the solvent evaporates to obtain a pretreated camphor powder. The pretreated camphor powder is added to the fluorine-free water repellent agent to obtain a modified camphor powder. The fluorine-based water-repellent agent comprises a weight ratio of camphor powder to fluorine-free water-repellent agent of 1:5, a mass ratio of camphor powder, triallyl cyanurate and N-vinyl pyrrolidine of 14:1.5:0.8, a microwave frequency of 2200 MHz, a microwave reflux treatment time of 10 min at an output power of 700 W, and a water-repellent finishing agent comprising, by weight, 3 parts of fluorine-free water-repellent agent, 0.2 parts of triethylenediamine, 1 part of isomeric decanol polyoxyethylene ether, 1 part of oleic acid polyethylene glycol diester and 50 parts of water.

[0056] Comparative Example 2

[0057] A method for preparing a water-repellent woven knitted fabric comprises the following steps:

[0058] Step S1: preparing a woven knitted fabric, using needle punching to make wool fibers on the woven fabric pass through the base fabric, so that the woven fabric and the base fabric are compounded together to form a woven knitted fabric;

[0059] Step S2: dipping the woven knitted fabric in a water-repellent finishing agent, performing rolling and pressing after dipping, and drying after double dipping and double pressing to obtain a water-repellent woven knitted fabric, wherein the water-repellent finishing agent is obtained by stirring and mixing a modified fluorine-free water-repellent agent, triethylene diamine, isomeric decanol polyoxyethylene ether, oleic acid polyethylene glycol diester and water, wherein the preparation process of the modified fluorine-free water-repellent agent is as follows:

[0060] Add nano-alumina to silica sol, ultrasonically disperse, dry, grind, calcine, then add propyltrimethoxysilane ethanol solution, stir to react, obtain nano-alumina composite liquid, mix diisocyanate, amine catalyst and nano-alumina composite liquid, stir to react, obtain solution A, dissolve saturated fatty acid in organic solvent to obtain solution B, add the obtained solution B dropwise to solution A, add reaction aid, carry out heat preservation reaction, obtain, add camphor powder to fluorine-free water-repellent agent, obtain modified fluorine-free water-repellent agent, replace fluorine-free water-repellent agent with the modified fluorine-free water-repellent agent in equal amount The water-repellent agent comprises a camphor powder and a fluorine-free water-repellent agent in a weight ratio of 1:5, a SiO2 content in the silica sol of 30%, a nano-alumina and silica sol in a weight ratio of 1:2, a nano-alumina and propyltrimethoxysilane in a weight ratio of 1:1.3, a diisocyanate, an amine catalyst and a nano-alumina composite liquid in a weight ratio of 1:0.25:0.7, and the water-repellent finishing agent comprises, by weight, 3 parts of a fluorine-free water-repellent agent, 0.2 parts of triethylenediamine, 1 part of isomeric decanol polyoxyethylene ether, 1 part of oleic acid polyethylene glycol diester and 50 parts of water.

[0061] The performance tests of the insect-proof and anti-mite down quilt fabrics prepared by the preparation methods of Examples 1-6 and Comparative Examples 1-2 were respectively carried out, and the test contents included: (1) water repellency test, which was carried out in accordance with "GB / T4745-2012 Testing and Evaluation of Water Repellency of Textiles - Water-Impact Method"; (2) perspiration color fastness test, which was carried out in accordance with GB / T3922-2013 to test acid perspiration color fastness and alkali perspiration color fastness; (3) wrinkle resistance test, which was carried out in accordance with the wrinkle recovery angle method in GB / T 3819-1997; the results are shown in the following table:

[0062] Table 1:

[0063]

[0064] Based on the above experimental data, the following conclusions are drawn:

[0065] As can be seen from the above table, the water-repellent woven knitted fabrics prepared by the methods of Examples 1-6 of the present invention have a water-repellent grade of more than 4, have good anti-wetting performance, are not wetted, and do not hang water drops. The alkali sweat color fastness in Examples 1-6 all reaches 4-5, and the acid sweat color fastness in Examples 4-6 is higher than the acid sweat color fastness in Example 3, and the acid sweat color fastness in Example 6 is the strongest. By comparing Comparative Example 2 with Example 6, it can be seen that camphor powder is mixed with triallyl cyanurate and N-vinyl pyrrolidone, and the mixed solution is subjected to microwave reflux treatment to achieve a significant improvement in acid sweat color fastness. The wrinkle recovery angles in Examples 1-6 all reach more than 150, and the wrinkle recovery angle in Example 6 is the highest, reaching 164.2. By comparing Comparative Example 1 with Example 6, it can be seen that the wrinkle resistance of the fabric can be enhanced by adding nano-alumina composite liquid to diisocyanate to modify it.

[0066] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for preparing a water-repellent woven and knitted fabric, characterized in that: The following steps are involved: Step S1: Compounding woven fabric and base fabric based on needle punching technology to obtain woven spun knitted fabric; Step S2: dipping the woven knitted fabric into a water-repellent finishing agent, performing rolling and pressing after dipping, and performing drying after double dipping and double pressing to obtain a water-repellent woven knitted fabric; The water-repellent finishing agent is obtained by mixing a modified fluorine-free water-repellent agent, triethylene diamine, isomeric decanol polyoxyethylene ether, oleic acid polyethylene glycol diester and water; The preparation process of the modified fluorine-free water repellent agent is as follows: soaking camphor powder in anhydrous ethanol of equal weight, adding triallyl cyanurate and N-vinyl pyrrolidone after mixing, subjecting the mixture to microwave reflux treatment, and grinding the mixture under heat preservation until the solvent evaporates to obtain pretreated camphor powder, and adding the pretreated camphor powder into the fluorine-free water repellent agent to obtain the modified fluorine-free water repellent agent; The preparation process of the fluorine-free water-repellent agent is as follows: adding nano-alumina to silica sol, ultrasonically dispersing, drying, grinding, calcining, then adding propyltrimethoxysilane ethanol solution, stirring and reacting to obtain nano-alumina composite liquid, mixing diisocyanate, amine catalyst and nano-alumina composite liquid, stirring and reacting to obtain solution A, dissolving saturated fatty acid in an organic solvent to obtain solution B, dropping the obtained solution B into solution A, adding a reaction aid, and performing heat preservation reaction to obtain.

2. The method for preparing a water-repellent woven and knitted fabric according to claim 1, characterized in that: The weight ratio of the camphor powder to the fluorine-free water repellent agent is 1:5, and the mass ratio of the camphor powder, triallyl cyanurate, and N-vinyl pyrrolidine is (12-15):(1-2):(0.5-1).

3. The method for preparing a water-repellent woven and knitted fabric according to claim 1, characterized in that: The microwave frequency of the microwave reflux treatment is 2200 MHz, and the microwave reflux treatment time is 10 min at an output power of 700 W.

4. The method for preparing a water-repellent woven and knitted fabric according to claim 1, characterized in that: The water-repellent finishing agent comprises, by weight, 2-4 parts of fluorine-free water-repellent agent, 0.1-0.3 parts of triethylenediamine, 1-2 parts of isomeric decanol polyoxyethylene ether, 1-2 parts of oleic acid polyethylene glycol diester and 45-55 parts of water.

5. The method for preparing a water-repellent woven and knitted fabric according to claim 1, characterized in that: In the step S2, the SiO2 content in the silica sol is 30%, the weight ratio of nano-alumina to silica sol is 1:(1.5-2.5), and the weight ratio of nano-alumina to propyltrimethoxysilane is 1:(1.2-1.4).

6. The method for preparing a water-repellent woven and knitted fabric according to claim 1, characterized in that: In the step S2, the weight ratio of the diisocyanate, the amine catalyst and the nano-alumina composite liquid is 1:(0.2-0.3):(0.6-0.8).

7. A water-repellent woven knitted fabric, characterized in that: The fabric is produced by the method for preparing the woven and knitted fabric according to any one of claims 1 to 6.

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