Waterproof material as well as knitted fabric and preparation process thereof

Abstract

The invention relates to a waterproof material as well as a knitted fabric and a preparation process thereof, and belongs to the technical field of fabrics. The preparation process of the knitted fabric comprises the following steps: step 1, preparing a waterborne polyurethane emulsion; step 2, preparation of a waterproof material: mixing a waterborne polyurethane emulsion and a reinforcing filler, adding a photoinitiator, and performing ultrasonic stirring to obtain the waterproof material; and step 3, preparing the knitted fabric: dipping the polyester knitted fabric in the waterproof material, taking out the polyester knitted fabric after dipping treatment, and carrying out light curing treatment and baking treatment to obtain the finished product knitted fabric. By optimizing the material formula and the technological process, the fabric has excellent waterproof performance and good air permeability, and meanwhile the soft and comfortable touch feeling is kept. The preparation process is simple and efficient, is suitable for large-scale production, can be widely applied to the fields of outdoor clothes, home textiles and the like, and has remarkable practicability and market prospects.

Description

Technical Field

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

[0002] Traditional knitted fabric waterproofing relies on solvent-based coatings or finishing processes, but these processes suffer from poor air permeability, a stiff feel, and insufficient environmental friendliness. While solvent-based coatings can provide a certain degree of waterproofing, the volatilization of their organic solvents can easily cause environmental pollution, and the coating has limited adhesion to the fabric, leading to a significant decrease in waterproofing performance after repeated washings. Furthermore, while inorganic fillers such as nano-silica can enhance the roughness of the coating through physical blending, they are prone to agglomeration due to their poor compatibility with the organic matrix, which in turn reduces waterproofing durability. Therefore, it is of great significance to develop a knitted fabric preparation technology that combines high waterproofing, good mechanical properties, and environmental friendliness.

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

[0004] Patent publication number CN104045998A, with IPC classification number C08L75 / 04, discloses a polyurethane slurry for producing PU peelable leather fabrics. The components, in parts by weight, are as follows: hydrolysis-resistant polyurethane: 100 parts; dimethyl methylamine: 5-7 parts; butanone: 20 parts; toluene: 18-20 parts; deionized water: 20 parts; N-methylethanolamine: 1 part; sodium diisobutyl octanesulfonate: 3 parts; and dye paste: 5-7 parts. This polyurethane slurry creates a coated fabric with uniform micropores that resists swelling in water, thereby improving the fabric's moisture permeability.

[0005] In recent years, water-based photocuring technology has attracted attention in the field of textile finishing due to its advantages such as environmental protection and high efficiency. However, the existing water-based polyurethane photocuring system still has shortcomings: on the one hand, simply improving the waterproofness by adding cross-linking agents can easily lead to brittle coating and decreased air permeability; on the other hand, the interfacial bonding force between nano-reinforced fillers and the matrix is ​​weak, making it difficult to effectively transfer stress, which limits the improvement of the mechanical properties of the fabric. Summary of the Invention

[0006] The present invention aims to provide a waterproof material, knitted fabric, and preparation process. By optimizing the material formula and process flow, the fabric achieves both excellent waterproof properties and good breathability while maintaining a soft and comfortable touch. 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, demonstrating significant practicality and market prospects.

[0007] The present invention modifies the nano-silica filler to form a covalent cross-linked network with the water-based polyurethane matrix, breaking through the limitations of traditional physical blending. It improves the mechanical strength of the fabric while enhancing its waterproofness, providing an innovative solution for the preparation of high-performance waterproof knitted fabrics.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A waterproof material, the preparation method of which comprises:

[0010] Step 1, preparing an aqueous polyurethane emulsion;

[0011] Step 2: preparing a waterproof material: mixing an aqueous polyurethane emulsion and a reinforcing filler, adding a photoinitiator and ultrasonically stirring to obtain a waterproof material.

[0012] In the above step 1, preparing the water-based polyurethane emulsion comprises the following steps: mixing isophorone diisocyanate, a polyol, and an organic tin compound, heating the mixture for an oil bath, adding a mixture of 2,2-dihydroxymethylpropionic acid and acetone, heating and maintaining the temperature, then cooling the mixture, adding a mixed solution of ricinoleic acid and acetone, cooling the mixture again, adding pentaerythritol triacrylate, continuing to maintain the temperature, then cooling the mixture, adding triethylamine, and then adding deionized water for emulsification, and rotary evaporation to obtain the water-based polyurethane emulsion.

[0013] In the above step 1, the aqueous polyurethane emulsion comprises the following steps: under a nitrogen environment, mixing isophorone diisocyanate, a polyol, and an organotin compound, heating to 62-65° C. and placing in an oil bath for 2-3 hours, then adding a mixture of 2,2-dihydroxymethylpropionic acid and acetone, heating to 75-80° C. and keeping the temperature for 1-2 hours, then cooling to 65-70° C., adding a mixed solution of ricinoleic acid and acetone, then cooling to 60° C., adding pentaerythritol triacrylate, continuing to keep the temperature for 2-3 hours, then cooling by 50° C., adding triethylamine, and then adding deionized water for emulsification, and after rotary evaporation to remove the acetone, obtaining an aqueous polyurethane emulsion.

[0014] A preparation process of a knitted fabric comprises the following steps:

[0015] Step 1, preparing an aqueous polyurethane emulsion;

[0016] Step 2, preparing a waterproof material: mixing an aqueous polyurethane emulsion and a reinforcing filler, adding a photoinitiator and ultrasonically stirring to obtain a waterproof material;

[0017] Step 3, preparing knitted fabric: immersing the polyester knitted fabric in a waterproof material, taking it out after immersion treatment, and obtaining the finished knitted fabric after light curing treatment and baking treatment.

[0018] As a preferred technical solution of the present invention, in step 1, preparing an aqueous polyurethane emulsion comprises the following steps: mixing isophorone diisocyanate, a polyol, and an organic tin compound, heating the mixture to an oil bath, adding a mixture of 2,2-dihydroxymethylpropionic acid and acetone, heating and maintaining the temperature, then cooling the mixture, adding a mixed solution of ricinoleic acid and acetone, cooling the mixture again, adding pentaerythritol triacrylate, continuing to maintain the temperature, then cooling the mixture, adding triethylamine, and then adding deionized water for emulsification, and rotary evaporation to obtain an aqueous polyurethane emulsion.

[0019] As a preferred technical solution of the present invention, in step 1, the aqueous polyurethane emulsion comprises the following steps: under a nitrogen environment, mixing isophorone diisocyanate, a polyol, and an organic tin compound, heating to 62-65° C. and placing in an oil bath for 2-3 hours, then adding a mixture of 2,2-dihydroxymethylpropionic acid and acetone, heating to 75-80° C. and keeping warm for 1-2 hours, then cooling to 65-70° C., adding a mixed solution of ricinoleic acid and acetone, then cooling to 60° C., adding pentaerythritol triacrylate, continuing to keep warm for 2-3 hours, then cooling by 50° C., adding triethylamine, and then adding deionized water for emulsification, and after rotary evaporation to remove the acetone, obtaining an aqueous polyurethane emulsion.

[0020] As a preferred technical solution of the present invention, the above-mentioned method uses polyol, diisocyanate, and reinforcing filler as the main raw materials, generates a prepolymer through a catalytic reaction, and then emulsifies the chain-extended product through phase transition to form a modified polymer emulsion. This emulsion is used for padding treatment of polyester knitted fabric, ultimately producing a knitted fabric with both waterproof and high strength properties.

[0021] As a preferred technical solution of the present invention, in the preparation of the aqueous polyurethane emulsion, the mass ratio of isophorone diisocyanate, polyol, 2,2-dimethylolpropionic acid, ricinoleic acid, pentaerythritol triacrylate, deionized water and organotin 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-dimethylolpropionic acid and acetone in the mixed solution is 1:0.6-1.0, the mass ratio of ricinoleic acid and acetone in the mixed solution is 1:0.3-0.4, and the mass ratio of triethylamine and 2,2-dimethylolpropionic acid is 0.7-0.75:1.0.

[0022] As a preferred technical solution of the present invention, 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 compound of polycarbonate diol and 1,6-hexanediol, and the compounding molar ratio is 1:0.2-0.5.

[0023] As a preferred technical solution of the present invention, 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 invention, in step 2, the ultrasonic stirring is performed at 200-300W for 15-20 minutes, 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 invention, in step three, the impregnation treatment is impregnation at a rolling rate of 60-80% for 5-10 minutes, the light curing treatment is irradiation under 365nm ultraviolet light for 6-10 minutes, the baking treatment is pre-baking at 80-100℃ for 3-5 minutes and then drying at 120-140℃ for 2-5 minutes, and the mass ratio of polyester knitted fabric to waterproof material is 1:4-10.

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

[0027] Nano-silica and anhydrous ethanol are placed in a stirring kettle and stirred, p-aminobenzoic acid is added for ultrasonic treatment, geranyl aldehyde is added for stirring and reaction, filtered, and solids are washed and dried to obtain a reinforcing filler.

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

[0029] Nano-silica and anhydrous ethanol are placed in a stirring kettle and stirred at a speed of 500-800 r / min for 30-40 minutes. Para-aminobenzoic acid is added and ultrasonicated at a power of 400-500 W for 20-25 minutes. Geranial is added and stirred at a temperature of 40-55° C. for 4-6 hours. The mixture is filtered, and the solid is washed three times with pure ethanol and freeze-dried to obtain a reinforced filler.

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

[0031] Beneficial effects of the present invention:

[0032] By optimizing the material formulation and process flow, the present invention achieves a fabric that combines excellent waterproof properties with good breathability while maintaining a soft and comfortable touch. The simple and efficient preparation process is suitable for large-scale production and has significant practicality and market prospects for applications in outdoor clothing, home textiles, and other fields.

[0033] The present invention uses reinforcing fillers (modified nano-silica) to provide roughness, enhance rigidity, wear resistance, and washability, thereby reducing the porosity of the knitted fabric surface coating and inhibiting crack propagation, thereby significantly improving the waterproofness and mechanical properties; para-aminobenzoic acid acts as a molecular bridge to strengthen the interface between the nano-silica filler and the matrix, reduce water seepage channels, and increase bonding strength, thereby assisting in enhancing waterproof durability and mechanical stability; geranial introduces hydrophobic terpene chains to enhance hydrophobicity, and its long-chain structure regulates the toughness of the coating, ensuring the waterproof effect while reducing embrittlement; pentaerythritol triacrylate constructs a dense cross-linked network, reduces water molecule penetration, improves chemical resistance, and enhances the coating's tensile strength, tear resistance, and dimensional stability. DETAILED DESCRIPTION

[0034] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0035] Example 1

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

[0037] Step 1: Prepare waterborne polyurethane emulsion:

[0038] Under a nitrogen environment, isophorone diisocyanate, polyol, and an organotin compound are mixed, heated to 62°C for 2 hours in an oil bath, and then a mixture of 2,2-dimethylolpropionic acid and acetone is added. The temperature is raised to 75°C and kept warm for 1 hour, then cooled to 65°C, a mixed solution of ricinoleic acid and acetone is added, and then cooled to 60°C, pentaerythritol triacrylate is added, and the temperature is kept warm for 2 hours. The temperature is then lowered by 50°C, triethylamine is added, and deionized water is added for emulsification. After the acetone is evaporated off, a water-based polyurethane emulsion is obtained.

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

[0040] Step 2, prepare a waterproof material: mix the aqueous polyurethane emulsion and the reinforcing filler, add photoinitiator 2959 and ultrasonicate at 200W for 15 minutes to obtain a waterproof material; the mass ratio of the aqueous polyurethane emulsion, the reinforcing filler and the photoinitiator is 110:10:0.10; the model of the polycarbonate diol is JSB20, the molecular weight is 2000, and the hydroxyl value is 55mgKOH / g.

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

[0042] Nano-silica and anhydrous ethanol were placed in a stirring kettle and stirred at 500 r / min for 30 minutes, p-aminobenzoic acid was added and ultrasonicated at 400 W for 20 minutes, geranyl aldehyde was added and stirred at 40° C. for 4 hours, filtered, and the solid was washed three times with pure ethanol and freeze-dried to obtain a reinforced filler; the mass ratio of the nano-silica, p-aminobenzoic acid, anhydrous ethanol and geranyl aldehyde was 10:1.4:35:2.6;

[0043] Step 3, preparing knitted fabric: immersing polyester knitted fabric in waterproof material at a 60% residual rate for 5 minutes, taking it out, irradiating it under 365nm ultraviolet light for 6 minutes, pre-baking it at 80℃ for 3 minutes, and drying it at 120℃ for 5 minutes to obtain the knitted fabric; the mass ratio of polyester knitted fabric to waterproof material is 1:4.

[0044] Example 2

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

[0046] Step 1: Prepare waterborne polyurethane emulsion:

[0047] In a nitrogen environment, isophorone diisocyanate, polyols, and an organic tin compound are mixed, heated to 64° C. and placed in an oil bath for 2.5 hours, then a mixed solution of 2,2-dimethylol propionic acid and acetone is added, heated to 78° C. and kept warm for 1.5 hours, then cooled to 68° C., a mixed solution of ricinoleic acid and acetone is added, then cooled to 60° C., pentaerythritol triacrylate is added, and the mixture is kept warm for 2.5 hours, then cooled by 50° C., triethylamine is added, and then deionized water is added for emulsification. After the acetone is evaporated off, an aqueous polyurethane emulsion is obtained; the isophorone diisocyanate, polyols, 2,2-dimethylol propionic acid, ricinoleic acid, pentaerythritol triacrylate are added. The mass ratio of olefinic acid ester, deionized water and organic tin compound is 8:14:0.9:1.6:1.2:42:0.012, the mass ratio of 2,2-dihydroxymethylpropionic acid and acetone in the mixed solution is 1:0.8, the mass ratio of ricinoleic acid and acetone in the mixed solution is 1:0.35, and the mass ratio of triethylamine and 2,2-dihydroxymethylpropionic acid is 0.72:1.0; the polyol is a compound of polycarbonate diol and 1,6-hexanediol, and the compounding molar ratio is 1:0.4; the organic tin compound is dibutyltin dilaurate; the model of the polycarbonate diol is JSB20, the molecular weight is 2000, and the hydroxyl value is 55 mgKOH / g.

[0048] Step 2: Prepare a waterproof material: Mix the waterborne polyurethane emulsion and the reinforcing filler, add the photoinitiator 2959, and ultrasonicate at 250W for 18 minutes to obtain a waterproof material; the mass ratio of the waterborne polyurethane emulsion, the reinforcing filler, and the photoinitiator is 115:11:0.11;

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

[0050] Nano-silica and anhydrous ethanol were placed in a stirred tank and stirred at 650 r / min for 35 minutes, p-aminobenzoic acid was added and ultrasonicated at 450 W for 22 minutes, geranyl aldehyde was added and stirred at 48° C. for 5 hours, filtered, and the solid was washed three times with pure ethanol and freeze-dried to obtain a reinforced filler; the mass ratio of the nano-silica, p-aminobenzoic acid, anhydrous ethanol and geranyl aldehyde was 10.5:1.6:40:2.9;

[0051] Step 3, preparing knitted fabric: immersing polyester knitted fabric in waterproof material at a 70% residual rate for 8 minutes, taking it out, irradiating it under 365nm ultraviolet light for 8 minutes, pre-baking it at 90℃ for 4 minutes, and drying it at 130℃ for 4 minutes to obtain the knitted fabric; the mass ratio of polyester knitted fabric to waterproof material is 1:4.5.

[0052] Example 3

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

[0054] Step 1: Prepare waterborne polyurethane emulsion:

[0055] In a nitrogen environment, isophorone diisocyanate, polyols, and an organic tin compound are mixed, heated to 65° C. and placed in an oil bath for 3 hours, then a mixed solution of 2,2-dimethylolpropionic acid and acetone is added, the temperature is raised to 80° C. and kept warm for 2 hours, then cooled to 70° C., a mixed solution of ricinoleic acid and acetone is added, then cooled to 60° C., pentaerythritol triacrylate is added, and the temperature is kept warm for 3 hours, then cooled by 50° C., triethylamine is added, and then deionized water is added for emulsification. After the acetone is evaporated off, an aqueous polyurethane emulsion is obtained; the isophorone diisocyanate, polyols, 2,2-dimethylolpropionic acid, ricinoleic acid, pentaerythritol triacrylate are mixed. The mass ratio of ester, deionized water and organic tin compound is 9:15:1.0:1.8:1.3:45:0.013, the mass ratio of 2,2-dihydroxymethylpropionic acid and acetone in the mixed solution is 1:1.0, the mass ratio of ricinoleic acid and acetone in the mixed solution is 1:0.4, and the mass ratio of triethylamine and 2,2-dihydroxymethylpropionic acid is 0.75:1.0; the polyol is a compound of polycarbonate diol and 1,6-hexanediol, and the compounding molar ratio is 1:0.5; the organic tin compound is dibutyltin dilaurate; the model of the polycarbonate diol is JSB20, the molecular weight is 2000, and the hydroxyl value is 55 mgKOH / g.

[0056] Step 2: Prepare a waterproof material: Mix the waterborne polyurethane emulsion and the reinforcing filler, add the photoinitiator 2959, and ultrasonicate at 300W for 20 minutes to obtain a waterproof material; the mass ratio of the waterborne polyurethane emulsion, the reinforcing filler, and the photoinitiator is 120:12:0.12;

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

[0058] Nano-silica and anhydrous ethanol were placed in a stirred tank and stirred at 800 r / min for 40 minutes, p-aminobenzoic acid was added and ultrasonicated at 500 W for 25 minutes, geranyl aldehyde was added and stirred at 55° C. for 6 hours, and the mixture was filtered. The solid was washed three times with pure ethanol and freeze-dried to obtain a reinforced filler; the mass ratio of the nano-silica, p-aminobenzoic acid, anhydrous ethanol and geranyl aldehyde was 11:1.8:45:3.2;

[0059] Step 3, preparing knitted fabric: immersing polyester knitted fabric in waterproof material at 80% residual rate for 10 minutes, taking it out, irradiating it under 365nm ultraviolet light for 10 minutes, pre-baking it at 100℃ for 5 minutes, and drying it at 140℃ for 2 minutes to obtain knitted fabric; the mass ratio of polyester knitted fabric to waterproof material is 1:5.

[0060] Comparative Example 1

[0061] Compared with Example 3, the difference in Comparative Example 1 is that aminobenzene replaces p-aminobenzoic acid, and the other components, preparation steps and parameters are the same.

[0062] Comparative Example 2

[0063] Compared with Example 3, the difference in Comparative Example 2 is that geranyl aldehyde is not used, and the remaining components, preparation steps and parameters are the same.

[0064] Comparative Example 3

[0065] Compared with Example 3, Comparative Example 3 is different in that pentaerythritol triacrylate is not used, and the other components, preparation steps and parameters are the same.

[0066] Comparative Example 4

[0067] Compared with Example 3, Comparative Example 4 is different in that nano-silica is used instead of the reinforcing filler, and the other components, preparation steps and parameters are the same.

[0068] The knitted fabrics prepared in Examples 1-3 and Comparative Examples 1-4 were tested as follows. The test results are shown in Table 1.

[0069] Waterproofing: Contact angles were measured at room temperature using a contact angle meter using a 4-microliter stationary water droplet. The final contact angle value was calculated by averaging five measurements taken at different locations on the sample.

[0070] Washability Test: Sample fabrics were tested in accordance with the standard GB / T5713-2013, "Test Method for Color Fastness to Water," simulating a home washing process. Washing conditions were: 4g / L standard laundry detergent, 1g / L sodium carbonate, in a shaking water bath, a bath ratio of 1:50, a temperature of 25°C, and a wash time of 30 minutes. After 20 washes, the decrease in the surface contact angle was calculated: decrease = (surface contact angle before wash - surface contact angle after wash) / surface contact angle before wash × 100%. A lower decrease indicates better washability.

[0071] Table 1 Test results

[0072] Contact angle (°) Contact angle decrease rate (%) 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 compared with Comparative Examples 1-4, Examples 1-3 of the present invention have excellent waterproof performance and higher water-washing stability.

[0074] The invention attaches to the surface of the nano-silica through hydrogen bonding between the carboxyl groups of p-aminobenzoic acid and the hydroxyl groups on the surface of the nano-silica, and forms chemical bonds with the aldehyde groups of geranial through the amino groups of the p-aminobenzoic acid. The coated modified silica contains hydrophobic benzene ring groups, which can effectively improve the waterproof performance and stability of the knitted fabric. The 10-carbon hydrophobic chain segments on the geranial are arranged in a direction to repel water molecules. After the double bond of the geranial is combined with the pentaerythritol triacrylate for photocuring grafting, the hydrophobic chain segments are fixed to the surface of the knitted fabric through chemical bonds, thereby increasing the interfacial bonding force between the silica and the polyurethane, improving the mechanical strength of the knitted fabric, and effectively preventing the hydrophobic groups from falling off due to washing or friction, thereby making the waterproof performance more sustainable.

[0075] That is, the present invention uses reinforcing fillers (modified nano-silica) to provide roughness, enhance rigidity, wear resistance, and washability, thereby reducing the porosity of the surface coating of knitted fabrics and inhibiting crack propagation, thereby significantly improving the waterproofness and mechanical properties; para-aminobenzoic acid acts as a molecular bridge to strengthen the interface between the nano-silica filler and the matrix, reduce water seepage channels and improve bonding strength, and assist in enhancing waterproof durability and mechanical stability; geranyl introduces hydrophobic terpene chains to enhance hydrophobicity, and its long-chain structure regulates the toughness of the coating, ensuring the waterproof effect while reducing embrittlement; pentaerythritol triacrylate constructs a dense cross-linked network, reduces water molecule penetration and improves chemical resistance, thereby enhancing the coating's tensile strength, tear resistance, and dimensional stability.

[0076] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any indirect modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A waterproof material, characterized in that: The preparation method comprises: step 1, preparing an aqueous polyurethane emulsion; Step 2, preparing a waterproof material: mixing an aqueous polyurethane emulsion and a reinforcing filler, adding a photoinitiator and ultrasonically stirring to obtain a waterproof material; In step 1, preparing an aqueous polyurethane emulsion comprises the following steps: mixing isophorone diisocyanate, a polyol, and an organic tin compound, heating the mixture for an oil bath, adding a mixture of 2,2-dihydroxymethylpropionic acid and acetone, heating the mixture and keeping the temperature, then cooling the mixture, adding a mixed solution of ricinoleic acid and acetone, cooling the mixture again, adding pentaerythritol triacrylate, continuing to keep the temperature, then cooling the mixture, adding triethylamine, and then adding deionized water for emulsification, and rotary evaporating the mixture to obtain an aqueous polyurethane emulsion.

2. A process for preparing a knitted fabric, characterized in that: The preparation process comprises the following steps: Step 1, preparing an aqueous polyurethane emulsion; Step 2, preparing a waterproof material: mixing an aqueous polyurethane emulsion and a reinforcing filler, adding a photoinitiator and ultrasonically stirring to obtain a waterproof material; Step 3, preparing knitted fabric: immersing the polyester knitted fabric in a waterproof material, taking it out after immersion treatment, and obtaining the finished knitted fabric after light curing treatment and baking treatment.

3. The process for preparing a knitted fabric according to claim 2, wherein: In step 1, preparing an aqueous polyurethane emulsion comprises the following steps: mixing isophorone diisocyanate, a polyol, and an organic tin compound, heating the mixture for an oil bath, adding a mixture of 2,2-dihydroxymethylpropionic acid and acetone, heating the mixture and keeping the temperature, then cooling the mixture, adding a mixed solution of ricinoleic acid and acetone, cooling the mixture again, adding pentaerythritol triacrylate, continuing to keep the temperature, then cooling the mixture, adding triethylamine, and then adding deionized water for emulsification, and rotary evaporating the mixture to obtain an aqueous polyurethane emulsion.

4. The process for preparing a knitted fabric according to claim 3, wherein: The mass ratio of isophorone diisocyanate, polyol, 2,2-dihydroxymethylpropionic acid, ricinoleic 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.

5. The process for preparing a knitted fabric according to claim 3, wherein: The mass ratio of 2,2-dihydroxymethylpropionic acid to acetone in the mixture is 1:0.6-1.0, the mass ratio of ricinoleic acid to acetone in the mixed solution is 1:0.3-0.4, and the mass ratio of triethylamine to 2,2-dihydroxymethylpropionic acid is 0.7-0.75:1.

0.

6. The process for preparing a knitted fabric according to claim 3, wherein: The polyol is one or more of polycarbonate diol, polycaprolactone diol, polyether diol and 1,6-hexanediol, and the organic tin compound is one or more of dibutyltin dilaurate, stannous octoate and dibutyltin diacetate.

7. The process for preparing a knitted fabric according to claim 2, wherein: In step 2, the preparation method of the reinforcing filler includes the following steps: Nano-silica and anhydrous ethanol are placed in a stirring kettle and stirred, p-aminobenzoic acid is added for ultrasonic treatment, geranyl aldehyde is added for stirring and reaction, filtered, and solids are washed and dried to obtain a reinforcing filler.

8. The process for preparing a knitted fabric according to claim 7, wherein: The mass ratio of nano-silica, p-aminobenzoic acid, anhydrous ethanol and geranial is 10-11: 1.4-1.8：35-45：2.6-3.2。 9. The process for preparing a knitted fabric according to claim 2, wherein: In step 2, ultrasonic stirring is performed at 200-300W for 15-20 minutes, 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; Alternatively, in step three, the impregnation treatment is an impregnation at a 60-80% rolling ratio for 5-10 minutes, the light curing treatment is an irradiation under 365nm ultraviolet light for 6-10 minutes, the baking treatment is a pre-baking at 80-100°C for 3-5 minutes and then a drying at 120-140°C for 2-5 minutes, and the mass ratio of the polyester knitted fabric to the waterproof material is 1:4-10.

10. A knitted fabric prepared by the preparation process according to any one of claims 2 to 9.