Waterproof material, knitted fabric and preparation process thereof

Abstract

The present application relates to a kind of waterproof material and its knitted fabric and preparation process, belong to the technical field of fabric.A kind of preparation process of knitted fabric includes the following steps: step one, preparation water-based polyurethane emulsion;Step two, preparation waterproof material: water-based polyurethane emulsion and reinforcing filler are mixed, ultrasonic stirring is added to photoinitiator, obtain waterproof material;Step three, preparation knitted fabric: after being immersed in waterproof material and being immersed and being treated, take out, after light curing treatment and baking treatment, obtain finished product knitted fabric.The present application optimizes material formula and process flow, so that fabric has excellent waterproof performance and good air permeability, while keeping soft and comfortable touch.The preparation process is simple and efficient, suitable for mass production, can be widely used in outdoor clothing, home textiles and other fields, has significant practicality and market prospect.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fabrics, and relates to a waterproof material, a knitted fabric thereof and a preparation process. BACKGROUND

[0002] Traditional waterproof treatment of knitted fabrics mainly relies on solvent-based coating or post-finishing process, but there are problems such as poor air permeability, stiff hand feeling and insufficient environmental protection. Although solvent-based coating can provide certain waterproof effect, the organic solvent volatilization is easy to cause environmental pollution, and the coating has limited adhesion to the fabric, and the waterproof performance is significantly degraded after multiple washing. In addition, although inorganic fillers such as nano silicon dioxide can improve the roughness of the coating through physical blending, the compatibility with the organic matrix is poor, and agglomeration is easy to occur, which reduces the waterproof durability. Therefore, it is of great significance to develop a preparation technology of knitted fabric with high efficient waterproofness, good mechanical properties and environmental protection.

[0003] The patent for invention with publication number CN101240101B has an IPC classification number C08L33 / 08, and discloses a preparation method and application of a ketone hydrazine cross-linked acrylate-polyurethane composite textile emulsion. The method uses a cobalt 60-gamma radiation polymerization process to synthesize an acrylate emulsion containing active ketone carbonyl groups by using acrylate mixed monomers and diacetone acrylamide (DAAM); and then a ketone hydrazine cross-linked acrylate-polyurethane (PUA) composite textile emulsion is prepared by mixing the acrylate emulsion and a polyurethane emulsion containing a terminal hydrazine group in a certain proportion.

[0004] The patent for invention with publication number CN104045998A has an IPC classification number C08L75 / 04, and discloses a polyurethane slurry for producing a PU stripping skin fabric. The components are proportioned as follows in terms of mass parts: hydrolysis-resistant polyurethane: 100 parts; dimethylformamide: 5-7 parts; butanone: 20 parts; toluene: 18-20 parts; deionized water: 20 parts; N-methyl ethanolamine: 1 part; butyl diacid diisocetyl sulfonate sodium: 3 parts; and dye paste: 5-7 parts. The polyurethane slurry forms a coating fabric with uniform micropores, which is not easy to expand when encountering water, thereby helping to improve the moisture permeability of the fabric itself.

[0005] In recent years, water-based photocuring technology has attracted attention in the field of textile finishing due to its environmental protection and high efficiency, but the existing water-based polyurethane photocuring system still has some deficiencies. On the one hand, simply increasing the cross-linking agent to improve waterproofness can easily lead to the brittleness of the coating and the decrease of air permeability; on the other hand, the interface adhesion between the nano-enhanced filler and the matrix is weak, which makes it difficult to effectively transfer stress and limits the improvement of the mechanical properties of the fabric. SUMMARY

[0006] The application aims to provide a waterproof material and a knitting fabric and a preparation process thereof, and the application has excellent waterproof performance and good air permeability, and has a soft and comfortable touch feeling by optimizing the material formula and the process flow.

[0007] The application breaks through the limitation of traditional physical blending by modifying the nano-silica filler to form a covalent cross-linking network with the waterborne polyurethane matrix, improves the waterproof performance and the mechanical strength performance of the fabric, and provides an innovative solution for the preparation of high-performance waterproof knitting fabric.

[0008] The application can be achieved by the following technical solutions.

[0009] A waterproof material, and a preparation method thereof includes the following steps:

[0010] Step one, preparing a waterborne polyurethane emulsion;

[0011] Step two, preparing the waterproof material: mixing the waterborne polyurethane emulsion and the reinforcing filler, adding a photoinitiator and ultrasonic stirring to obtain the waterproof material.

[0012] In the above step one, the preparation of the waterborne polyurethane emulsion includes the following steps: mixing isophorone diisocyanate, polyol and organic tin compound, heating for oil bath, then adding a mixed solution of 2,2-dimethylol propionic acid and acetone, heating and keeping warm, then cooling, adding a mixed solution of castor oil acid and acetone, cooling again, adding pentaerythritol triacrylate, continuing to keep warm, then cooling, adding triethylamine, and then adding deionized water for emulsification, and then rotary evaporation to obtain the waterborne polyurethane emulsion.

[0013] In the above step one, the waterborne polyurethane emulsion includes the following steps: mixing isophorone diisocyanate, polyol and organic tin compound under a nitrogen environment, heating to 62-65 DEG C for oil bath for 2-3 h, then adding a mixed solution of 2,2-dimethylol propionic acid and acetone, heating to 75-80 DEG C and keeping warm for 1-2 h, then cooling to 65-70 DEG C, adding a mixed solution of castor oil acid and acetone, cooling to 60 DEG C again, adding pentaerythritol triacrylate, continuing to keep warm for 2-3 h, then cooling to 50 DEG C, adding triethylamine, and then adding deionized water for emulsification, and then rotary evaporation to remove acetone to obtain the waterborne polyurethane emulsion.

[0014] A preparation process of a knitting fabric includes the following steps:

[0015] Step one, preparing a waterborne polyurethane emulsion;

[0016] Step two, preparation of waterproof material: mixing water-based polyurethane emulsion and reinforcing filler, adding photo initiator, ultrasonic stirring, obtaining waterproof material;

[0017] Step three, preparation of knitted fabric: after the polyester knitted fabric is immersed in the waterproof material for immersion treatment, the product knitted fabric is obtained after light curing treatment and baking treatment.

[0018] As a preferred technical solution of the present application, in step one, the preparation of water-based polyurethane emulsion comprises the following steps: mixing isophorone diisocyanate, polyol, organic tin compound, warming for oil bath, then adding 2,2-dimethylol propionic acid and acetone mixture, warming and keeping warm, then cooling, adding castor oil acid and acetone mixed solution, cooling again, adding pentaerythritol triacrylate, continuing to keep warm, then cooling, adding triethylamine, then adding deionized water for emulsification, after rotary evaporation, obtaining water-based polyurethane emulsion.

[0019] As a preferred technical solution of the present application, in step one, the water-based polyurethane emulsion comprises the following steps: mixing isophorone diisocyanate, polyol, organic tin compound under nitrogen environment, warming to 62-65℃ for oil bath for 2-3h, then adding 2,2-dimethylol propionic acid and acetone mixture, warming to 75-80℃ and keeping warm for 1-2h, then cooling to 65-70℃, adding castor oil acid and acetone mixed solution, cooling to 60℃ again, adding pentaerythritol triacrylate, continuing to keep warm for 2-3h, then cooling to 50℃, adding triethylamine, then adding deionized water for emulsification, after rotary evaporation to remove acetone, obtaining water-based polyurethane emulsion.

[0020] As a preferred technical solution of the present application, the above scheme uses polyol, diisocyanate and reinforcing filler as main raw materials, generates prepolymer through catalytic reaction, and performs phase inversion emulsification on the chain extension product to form modified polymer emulsion. The emulsion is used for padding treatment of polyester knitted fabric, and finally obtains knitted fabric with waterproofness and high strength.

[0021] As a preferred technical solution of the present application, in the preparation of water-based polyurethane emulsion, the mass ratio of isophorone diisocyanate, polyol, 2,2-dimethylol propionic acid, castor oil acid, pentaerythritol triacrylate, deionized water and organic tin compound is 7-9:12-15:0.8-1.0:1.5-1.8:1.0-1.3:38-45:0.010-0.013, the mass ratio of 2,2-dimethylol propionic acid and acetone in the mixed solution is 1:0.6-1.0, the mass ratio of castor oil acid and acetone in the mixed solution is 1:0.3-0.4, and the mass ratio of triethylamine and 2,2-dimethylol propionic acid is 0.7-0.75:1.0.

[0022] As a preferred technical solution of the present application, the polyol is one or more of polycarbonate diol (PCDL), polycaprolactone diol (PCL), polyether diol (PTMG) and 1,6-hexanediol, preferably the polyol is a mixture of polycarbonate diol and 1,6-hexanediol, and the mixing molar ratio is 1:0.2-0.5.

[0023] As a preferred technical solution of the present application, the organotin compound is one or more of dibutyltin dilaurate, stannous octoate and dibutyltin diacetate, preferably dibutyltin dilaurate.

[0024] As a preferred technical solution of the present application, in step two, the ultrasonic stirring is at 200-300W for 15-20min, and the mass ratio of the aqueous polyurethane emulsion, the reinforcing filler and the photoinitiator is 110-120:10-12:0.10-0.12, and the photoinitiator is photoinitiator 2959, i.e. 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone.

[0025] As a preferred technical solution of the present application, in step three, the dipping treatment is at a 60-80% rolling rate for 5-10min, the photocuring treatment is irradiation under 365nm ultraviolet light for 6-10min, the baking treatment is pre-baking at 80-100℃ for 3-5min and then drying at 120-140℃ for 2-5min, and the mass ratio of the polyester knitted fabric and the waterproof material is 1:4-10.

[0026] As a preferred technical solution of the present application, the preparation method of the reinforcing filler comprises the following steps:

[0027] The nanosilica and anhydrous ethanol are stirred in a stirring kettle, p-aminobenzoic acid is added and ultrasonically treated, geranial is added and stirred to react, filtration is performed, the solid is washed and dried to obtain the reinforcing filler.

[0028] As a preferred technical solution of the present application, the preparation method of the reinforcing filler comprises the following steps:

[0029] The nanosilica and anhydrous ethanol are stirred in a stirring kettle at a rotation speed of 500-800r / min for 30-40min, p-aminobenzoic acid is added and ultrasonically treated at a power of 400-500W for 20-25min, geranial is added and stirred at a temperature of 40-55℃ for 4-6h, filtration is performed, the solid is washed with pure ethanol for three times, and freeze-drying is performed to obtain the reinforcing filler.

[0030] As a preferred technical solution of the present application, the mass ratio of the nanosilica, the p-aminobenzoic acid, the anhydrous ethanol and the geranial is 10-11:1.4-1.8:35-45:2.6-3.2.

[0031] The beneficial effects of the present application are as follows:

[0032] The present application has excellent waterproof performance and good air permeability, and maintains soft and comfortable touch by optimizing the material formula and process flow. The preparation process is simple and efficient, suitable for large-scale production, and can be widely used in outdoor clothing, home textiles and other fields, which has significant practicality and market prospect.

[0033] The present application significantly improves the waterproofness and mechanical properties by enhancing the filler (modified nano-silica) to provide roughness, enhance rigidity and wear resistance, wash resistance, reduce the surface coating pores of the knitted fabric and inhibit crack propagation; p-aminobenzoic acid as a molecular bridge, strengthens the interface bonding of nano-silica filler and matrix, reduces water penetration channels and improves adhesion strength, and assists in enhancing the waterproof durability and mechanical stability; geranial introduces hydrophobic terpene chain to improve hydrophobicity, and its long chain structure adjusts the toughness of the coating, which ensures the waterproof effect while reducing embrittlement; pentaerythritol triacrylate reduces water molecule penetration and improves chemical resistance by constructing a dense crosslinked network, and enhances the tensile, tear resistance and dimensional stability of the coating. DETAILED DESCRIPTION

[0034] To further illustrate the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the specific embodiments, structures, features and effects according to the present application are described in detail as follows in combination with examples.

[0035] Example 1

[0036] A preparation process of a knitted fabric includes the following steps:

[0037] Step one, preparing water-based polyurethane emulsion:

[0038] In a nitrogen environment, mix isophorone diisocyanate, polyol and organic tin compound, heat to 62℃ for oil bath for 2h, then add a mixture of 2,2-dimethylol propionic acid and acetone, heat to 75℃ and keep for 1h, then cool to 65℃, add a mixed solution of castor oil acid and acetone, then cool to 60℃, add pentaerythritol triacrylate, continue to keep for 2h, then cool to 50℃, add triethylamine, then add deionized water for emulsification, after removing acetone by rotary evaporation, water-based polyurethane emulsion is obtained;

[0039] The mass ratio of the isophorone diisocyanate, the polyol, the 2,2-dimethylol propionic acid, the ricinoleic acid, the pentaerythritol triacrylate, the deionized water and the organic tin compound is 7:12:0.8:1.5:1.0:38:0.010; the mass ratio of the 2,2-dimethylol propionic acid and the acetone in the mixed solution is 1:0.6; the mass ratio of the ricinoleic acid and the acetone in the mixed solution is 1:0.3, and the mass ratio of the triethylamine and the 2,2-dimethylol propionic acid is 0.7:1.0; the polyol is a compound of polycarbonate diol and 1,6-hexanediol, and the compound molar ratio is 1:0.2; and the organic tin compound is dibutyl tin dilaurate.

[0040] Step two, preparing the waterproof material: mixing the water-based polyurethane emulsion and the reinforcing filler, adding the photoinitiator 2959, and ultrasonicating for 15 min under 200 W to obtain the waterproof material; the mass ratio of the water-based polyurethane emulsion, the reinforcing filler and the photoinitiator is 110:10:0.10; the type of the polycarbonate diol is JSB20, the molecular weight is 2000, and the hydroxyl value is 55 mgKOH / g.

[0041] The preparation method of the reinforcing filler comprises the following steps:

[0042] The nanosilica and anhydrous ethanol are placed in a stirring kettle and stirred at a speed of 500 r / min for 30 min, the p-aminobenzoic acid is ultrasonically added under a power of 400 W for 20 min, the geranial is stirred at a temperature of 40℃ for 4 h, filtration is performed, the solid is washed with pure ethanol for three times, and freeze-drying is performed to obtain the reinforcing filler; the mass ratio of the nanosilica, the p-aminobenzoic acid, the anhydrous ethanol and the geranial is 10:1.4:35:2.6.

[0043] Step three, preparing the knitted fabric: the polyester knitted fabric is immersed in the waterproof material, taken out after being immersed for 5 min at a pick-up rate of 60%, irradiated under 365 nm ultraviolet light for 6 min, pre-dried at 80℃ for 3 min, and dried at 120℃ for 5 min to obtain the knitted fabric; the mass ratio of the polyester knitted fabric and the waterproof material is 1:4.

[0044] Example 2

[0045] A preparation process of a knitted fabric comprises the following steps:

[0046] Step one, preparing the water-based polyurethane emulsion:

[0047] The isophorone diisocyanate, polyol, organic tin compound are mixed under nitrogen environment, heated to 64℃ for oil bath for 2.5h, then 2,2-dimethylol propionic acid and acetone mixture is added, heated to 78℃ and kept for 1.5h, then cooled to 68℃, the castor oil acid and acetone mixed solution is added, then cooled to 60℃, the pentaerythritol triacrylate is added, continue to keep for 2.5h, then cooled to 50℃, the triethylamine is added, then deionized water is added for emulsification, after the acetone is removed by rotary evaporation, the aqueous polyurethane emulsion is obtained; the mass ratio of the isophorone diisocyanate, polyol, 2,2-dimethylol propionic acid, castor oil acid, pentaerythritol triacrylate, deionized water and organic tin compound is 8:14:0.9:1.6:1.2:42:0.012, the mass ratio of 2,2-dimethylol propionic acid and acetone in the mixture is 1:0.8, the mass ratio of castor oil acid and acetone in the mixed solution is 1:0.35, and the mass ratio of triethylamine and 2,2-dimethylol propionic acid is 0.72:1.0; the polyol is a compound of polycarbonate diol and 1,6-hexanediol, and the compound molar ratio is 1:0.4; the organic tin compound is dibutyltin dilaurate; the polycarbonate diol is JSB20, the molecular weight is 2000, and the hydroxyl value is 55mgKOH / g.

[0048] Step two, preparing waterproof material: mixing the aqueous polyurethane emulsion and reinforcing filler, adding the photoinitiator 2959 under 250W ultrasonic for 18min to obtain the waterproof material; the mass ratio of the aqueous polyurethane emulsion, reinforcing filler and photoinitiator is 115:11:0.11;

[0049] The preparation method of the reinforcing filler comprises the following steps:

[0050] The nanometer silicon dioxide and anhydrous ethanol are placed in a stirring kettle and stirred at a speed of 650r / min for 35min, the p-aminobenzoic acid is ultrasonically treated at a power of 450W for 22min, the geranial is stirred at a temperature of 48℃ for 5h, filtration is performed, the solid is washed with pure ethanol for three times, and freeze-drying is performed to obtain the reinforcing filler; the mass ratio of the nanometer silicon dioxide, p-aminobenzoic acid, anhydrous ethanol and geranial is 10.5:1.6:40:2.9;

[0051] Step three, preparing the knitted fabric: the polyester knitted fabric is immersed in the waterproof material, taken out after being immersed for 8min at a 70% pick-up rate, irradiated under 365nm ultraviolet light for 8min, pre-dried at 90℃ for 4min, and then dried at 130℃ for 4min to obtain the knitted fabric; the mass ratio of the polyester knitted fabric and the waterproof material is 1:4.5.

[0052] Example 3

[0053] A preparation process of a knitted fabric comprises the following steps:

[0054] Step one, preparing water-based polyurethane emulsion:

[0055] Under the nitrogen environment, mixing isophorone diisocyanate, polyol, organic tin compound, heating to 65℃ for oil bath 3h, then adding 2,2-dimethylol propionic acid and acetone mixture, heating to 80℃ and keeping 2h, then cooling to 70℃, adding castor oil acid and acetone mixed solution, cooling to 60℃, adding pentaerythritol triacrylate, keeping 3h, then cooling to 50℃, adding triethylamine, then adding deionized water for emulsification, after removing acetone by rotary evaporation, water-based polyurethane emulsion is obtained; the mass ratio of isophorone diisocyanate, polyol, 2,2-dimethylol propionic acid, castor oil acid, pentaerythritol triacrylate, deionized water and organic tin compound is 9:15:1.0:1.8:1.3:45:0.013, the mass ratio of 2,2-dimethylol propionic acid and acetone in the mixture is 1:1.0, the mass ratio of castor oil acid and acetone in the mixed solution is 1:0.4, and the mass ratio of triethylamine and 2,2-dimethylol propionic acid is 0.75:1.0; the polyol is a compound of polycarbonate diol and 1,6-hexanediol, and the compound molar ratio is 1:0.5; the organic tin compound is dibutyltin dilaurate; the type of polycarbonate diol is JSB20, the molecular weight is 2000, and the hydroxyl value is 55mgKOH / g.

[0056] Step two, preparing waterproof material: mixing water-based polyurethane emulsion and reinforcing filler, adding photoinitiator 2959 under 300W ultrasonic for 20min, to obtain waterproof material; the mass ratio of water-based polyurethane emulsion, reinforcing filler and photoinitiator is 120:12:0.12;

[0057] The preparation method of the reinforcing filler comprises the following steps:

[0058] Put nanosilica and anhydrous ethanol in the stirring kettle, fully stir at 800r / min for 40min, add p-amino benzoic acid under 500W ultrasonic for 25min, add geranial under 55℃ stirring for 6h, filter, wash the solid with pure ethanol for three times, freeze-dry to obtain the reinforcing filler; the mass ratio of nanosilica, p-amino benzoic acid, anhydrous ethanol and geranial is 11:1.8:45:3.2;

[0059] Step three, preparing knitted fabric: dip the polyester knitted fabric in the waterproof material, take out after 10min of 80% pick-up, irradiate under 365nm ultraviolet light for 10min, pre-dry at 100℃ for 5min, then dry at 140℃ for 2min, to obtain the knitted fabric; the mass ratio of polyester knitted fabric and waterproof material is 1:5.

[0060] Comparative Example 1

[0061] Comparative Example 1 differs from Example 3 in that amino benzene is used instead of p-aminobenzoic acid, and the rest of the components, preparation steps and parameters are consistent.

[0062] Comparative Example 2

[0063] Comparative Example 2 differs from Example 3 in that no geranial is used, and the rest of the components, preparation steps and parameters are consistent.

[0064] Comparative Example 3

[0065] Comparative Example 3 differs from Example 3 in that no pentaerythritol triacrylate is used, and the rest of the components, preparation steps and parameters are consistent.

[0066] Comparative Example 4

[0067] Comparative Example 4 differs from Example 3 in that nano-silica is used instead of reinforcing filler, and the rest of the components, preparation steps and parameters are consistent.

[0068] The knitted fabrics prepared in Examples 1-3 and Comparative Examples 1-4 were respectively tested by the following tests, and the test results are shown in Table 1.

[0069] Waterproof performance test: Under room temperature conditions, a contact angle measuring instrument was used to measure the contact angle by a fixed water droplet of 4 microliters. The final contact angle value was obtained by calculating the average of five measurement results of different areas of the sample.

[0070] Washing resistance performance test: According to the standard GB / T5713-2013 "Textile color fastness to washing test method", the sample fabric was tested by simulating the household washing process. The washing conditions were: standard washing powder 4g / L, sodium carbonate 1g / L, water bath oscillation, bath ratio 1:50, temperature 25℃, washing time 30 minutes. After the sample fabric was washed for 20 times, the surface stable contact angle drop rate was calculated, surface stable contact angle drop rate = (surface stable contact angle before washing-surface stable contact angle after washing) / surface stable contact angle before washing x 100%, and the lower the surface stable contact angle drop rate, the better the washing resistance.

[0071] Table 1 test results

[0072] Contact angle (°) Contact angle reduction (%) Example 1 141 0.48 Example 2 143 0.45 Example 3 145 0.42 Comparative Example 1 104 1.57 Comparative Example 2 113 1.41 Comparative Example 3 104 1.62 Comparative Example 4 115 1.35

[0073] From the test results in Table 1, it can be seen that Examples 1-3 and Comparative Examples 1-4 have excellent waterproof performance and high washing resistance stability.

[0074] The present application can effectively improve the waterproof performance and stability of the knitted fabric by attaching p-aminobenzoic acid on the surface of nano-silica through hydrogen bonding with the hydroxyl group on the surface of nano-silica, and forming a chemical bond between the amino group of p-aminobenzoic acid and the aldehyde group of geranial, and the modified silica contains a hydrophobic benzene ring group, and the 10-carbon hydrophobic chain segment of geranial is arranged in a direction, which repels water molecules, and the double bond of geranial can be grafted with pentaerythritol triacrylate after photocuring, and the hydrophobic chain segment is fixed on the surface of the knitted fabric through a chemical bond, which increases the interfacial bonding force between the silica and the polyurethane, improves the mechanical strength of the knitted fabric, effectively avoids the shedding of the hydrophobic group caused by washing or friction, and has stronger waterproof performance persistence.

[0075] That is, the present application can significantly improve the waterproofness and mechanical properties by providing roughness, enhancing rigidity and wear resistance, and washing resistance, reducing the pores of the surface coating of the knitted fabric and inhibiting crack propagation; p-aminobenzoic acid as a molecular bridge strengthens the interfacial bonding between the nano-silica filler and the matrix, reduces water penetration channels and improves the bonding strength, and assists in enhancing the waterproof durability and mechanical stability; geranial introduces a hydrophobic terpene chain to improve hydrophobicity, and the long chain structure adjusts the toughness of the coating, which ensures the waterproof effect while reducing embrittlement; pentaerythritol triacrylate reduces water molecule penetration and improves chemical resistance by constructing a dense crosslinked network, and enhances the tensile resistance, tear resistance and dimensional stability of the coating.

[0076] The above is only a preferred embodiment of the present application, and does not limit the present application in any form, although the present application has been disclosed as above, however, it is not intended to limit the present application, any person skilled in the art, without departing from the technical solution of the present application, can make some changes or modifications of the above disclosed technical content as equivalent embodiments, but as long as it does not deviate from the technical solution of the present application, any indirect modification, equivalent change and modification of the above embodiments according to the technical essence of the present application, are still within the scope of the technical solution of the present application.

Claims

1. A waterproof material, characterized by, The preparation method comprises the following steps: step one, preparing water-based polyurethane emulsion; Step two, preparing waterproof material: mixing the water-based polyurethane emulsion and the reinforcing filler, adding a photo initiator and ultrasonic stirring to obtain the waterproof material; In step one, the preparation of the water-based polyurethane emulsion comprises the following steps: mixing isophorone diisocyanate, polyol and organic tin compound, heating for oil bath, then adding a mixed solution of 2,2-dimethylol propionic acid and acetone, heating and keeping warm, then cooling, adding a mixed solution of castor oil acid and acetone, cooling again, adding pentaerythritol triacrylate, continuing to keep warm, then cooling, adding triethylamine, then adding deionized water for emulsification, and obtaining the water-based polyurethane emulsion after rotary evaporation; In step two, the preparation method of the reinforcing filler comprises the following steps: The nano-silicon dioxide and anhydrous ethanol are stirred in a stirring kettle, p-aminobenzoic acid is added for ultrasonic treatment, geranial is added for stirring reaction, filtration is performed, the solid is washed and dried to obtain the reinforcing filler.

2. A process for the production of a knitted fabric, characterized in that, The preparation process comprises the following steps: Step one, preparing water-based polyurethane emulsion; Step two, preparing waterproof material: mixing the water-based polyurethane emulsion and the reinforcing filler, adding a photo initiator and ultrasonic stirring to obtain the waterproof material; Step three, preparing knitted fabric: the polyester knitted fabric is immersed in the waterproof material for immersion treatment, and then taken out, and the finished knitted fabric is obtained after light curing treatment and baking treatment; In step one, the preparation of the water-based polyurethane emulsion comprises the following steps: mixing isophorone diisocyanate, polyol and organic tin compound, heating for oil bath, then adding a mixed solution of 2,2-dimethylol propionic acid and acetone, heating and keeping warm, then cooling, adding a mixed solution of castor oil acid and acetone, cooling again, adding pentaerythritol triacrylate, continuing to keep warm, then cooling, adding triethylamine, then adding deionized water for emulsification, and obtaining the water-based polyurethane emulsion after rotary evaporation; In step two, the preparation method of the reinforcing filler comprises the following steps: The nano-silicon dioxide and anhydrous ethanol are stirred in a stirring kettle, p-aminobenzoic acid is added for ultrasonic treatment, geranial is added for stirring reaction, filtration is performed, the solid is washed and dried to obtain the reinforcing filler.

3. A process for the production of a knitted fabric according to claim 2, characterized in that: The mass ratio of isophorone diisocyanate, polyol, 2,2-dimethylol propionic acid, castor oil acid, pentaerythritol triacrylate, deionized water and organic tin compound is 7-9:12-15:0.8-1.0:1.5-1.8:1.0-1.3:38-45:0.010-0.

013.

4. A process for the production of a knitted fabric according to claim 2, characterized in that: The mass ratio of 2,2-dimethylol propionic acid and acetone in the mixture is 1:0.6-1.0, the mass ratio of castor oil acid and acetone in the mixed solution is 1:0.3-0.4, and the mass ratio of triethylamine and 2,2-dimethylol propionic acid is 0.7-0.75:1.

0.

5. A process for the production of a knitted fabric according to claim 2, characterized in that: The polyol is one or more of polycarbonate diol, polyhexalactone diol, polyether diol and 1,6-hexanediol, and the organic tin compound is one or more of dibutyltin dilaurate, stannous octoate and dibutyltin diacetate.

6. A process for the production of a knitted fabric according to claim 2, characterized in that: The mass ratio of nano-silicon dioxide, p-aminobenzoic acid, anhydrous ethanol and geranial is 10-11: 1.4-1.8：35-45：2.6-3.2。 7. The process according to claim 2, wherein: in step two, the ultrasonic stirring is 200-300 W for 15-20 min, the mass ratio of the waterborne polyurethane emulsion, the reinforcing filler and the photoinitiator is 110-120:10-12:0.10-0.12, and the photoinitiator is photoinitiator 2959; or, in step three, the dipping treatment is 60-80% pick-up for 5-10 min, the photocuring treatment is irradiation under 365 nm ultraviolet light for 6-10 min, the baking treatment is pre-baking at 80-100 °C for 3-5 min followed by drying at 120-140 °C for 2-5 min, and the mass ratio of the polyester knitted fabric and the waterproof material is 1:4-10.

8. A knitted fabric prepared by the process according to any one of claims 2-7.