A hydrophobic nylon composite and a method for preparing the same
By introducing hydrophobically modified diatomaceous earth into nylon materials and using chemical bonding grafting to improve its hydrophobic properties, the problem of insufficient hydrophilicity of nylon materials was solved, and a highly efficient hydrophobic modification effect was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HEFEI GENIUS NEW MATERIALS CO LTD
- Filing Date
- 2024-12-26
- Publication Date
- 2026-06-26
AI Technical Summary
Nylon materials have strong polarity and hydrophilicity due to the amide bonds they contain, resulting in insufficient hydrophobicity and limiting their application in certain special scenarios.
Using diatomaceous earth as the matrix of a hydrophobic material, 3-aminopropyltriethoxysilane is introduced onto its surface and 1H,1H,2H,2H-perfluorooctyltrichlorosilane is added to form chemical bonds for grafting. This results in strong bonding and the material reacts with caprolactam to participate in polymerization, thus preparing a hydrophobically modified diatomaceous earth material that is anchored inside a nylon composite material.
The prepared hydrophobic nylon composite material exhibits good hydrophobic properties, is uniformly dispersed, and is durable and effective, thus improving the hydrophobicity of the material.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of polymer composite materials, specifically a nylon composite material and its preparation method. Background Technology
[0002] Nylon possesses high rigidity and toughness, along with excellent processability and self-lubricating properties, making it the most widely used engineering plastic. Nylon is extensively used in bathroom materials, appliance housings, and other applications. In certain specific applications, nylon materials require a certain degree of hydrophobicity to prevent dirt buildup and improve surface dryness, reducing bacterial growth. However, the amide bonds in nylon exhibit strong polarity and hydrophilicity, affecting its hydrophobic properties and limiting its applications. Summary of the Invention
[0003] In view of this, the present invention provides a hydrophobic nylon composite material and its preparation method to address the requirements for improving the hydrophobic properties of nylon surface materials mentioned in the background art.
[0004] To achieve the above objectives, the present invention provides the following technical solution:
[0005] A hydrophobic nylon composite material is prepared from the following components in parts by weight:
[0006] Caprolactam 89-98.6 parts;
[0007] 1-5 parts of hydrophobically modified diatomaceous earth;
[0008] Catalyst 0.2-3 parts;
[0009] 0.2-3 parts of co-catalyst;
[0010] The caprolactam is ε-caprolactam with a purity of 99% or higher; the catalyst is sodium hydroxide; and the co-catalyst is toluene diisocyanate (TDI).
[0011] The preparation method of the above-mentioned hydrophobically modified diatomite includes the following steps:
[0012] a. Dissolve 3-aminopropyltriethoxysilane in a mixture of ethanol and deionized water, wherein the mass ratio of 3-aminopropyltriethoxysilane:ethanol:deionized water is 1:(3-5):(0.4-0.6), and adjust the pH value to 5.2-5.6 with acetic acid; stir the above solution at room temperature for 1-2 hours.
[0013] b. Take 10g of diatomaceous earth and calcine it at 400-500℃ for 2-5 hours. Add it to 100mL of ethanol solution and stir evenly. Then add the 3-aminopropyltriethoxysilane solution prepared above and stir at 70-90℃ for 8-12 hours.
[0014] c. Filter the particulate matter in the liquid and wash it with deionized water 3-5 times. Dry it in a vacuum oven at 100℃-130℃ for 2-4 hours to obtain diatomaceous earth modified with 3-aminopropyltriethoxysilane.
[0015] d. Add 1g of the 3-aminopropyltriethoxysilane-modified diatomaceous earth prepared above to 10-20ml of hexane, and simultaneously add 0.2-0.5g of 1H,1H,2H,2H-perfluorooctyltrichlorosilane. After stirring at room temperature for 12-24 hours, filter out the particulate matter, wash it three times with hexane, and then dry it in an oven at 60-70℃ for 4-8 hours. The hydrophobically modified diatomaceous earth material is then obtained.
[0016] The method for preparing the hydrophobic nylon composite material described above includes the following steps:
[0017] The caprolactam was placed in a container and heated to melt, then a vacuum was drawn, and the temperature inside the container was controlled at 120-160℃.
[0018] Wait until all air bubbles in the container disappear. Restore the container to normal pressure, add hydrophobically modified diatomaceous earth and catalyst, continue evacuating, and control the reaction temperature at 120-160℃;
[0019] Once the bubbles in the container have completely disappeared, restore the container to normal pressure, add the catalyst, stir quickly and evenly, then pour it into a mold preheated to 140-170℃, keep it warm for 0.5-3 hours, remove it, and let it cool naturally to obtain the hydrophobic nylon composite material.
[0020] Compared with the prior art, the beneficial effects of the present invention are:
[0021] This invention selects diatomaceous earth as the matrix for the hydrophobic material because the surface of diatomaceous earth is rich in hydroxyl groups. After introducing 3-aminopropyltriethoxysilane onto the surface of diatomaceous earth, 1H,1H,2H,2H-perfluorooctyltrichlorosilane is then added to the amino group of 3-aminopropyltriethoxysilane. 1H,1H,2H,2H-perfluorooctyltrichlorosilane has excellent hydrophobic properties and is chemically grafted onto the surface of diatomaceous earth, resulting in strong adhesion and preventing it from easily falling off during use. Furthermore, the residual -NH2 on the surface of diatomaceous earth can react with the -NCO group of caprolactam to participate in the polymerization reaction, allowing the hydrophobically modified diatomaceous earth material to be firmly anchored inside the matrix material, dispersed evenly, and exhibiting better and more durable hydrophobicity, thereby preparing a nylon composite material with good hydrophobic properties. Detailed Implementation
[0022] To facilitate understanding of the present invention, a more comprehensive description will be given below with reference to specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention.
[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
[0024] The specific information of the raw materials used in the following examples and comparative examples is as follows:
[0025] ε-Caprolactam, manufactured by Henan Shenma, brand name caprolactam-SM;
[0026] Sodium hydroxide, manufactured by Linyi Haixing Chemical, brand name: sodium hydroxide;
[0027] TDI (toluene diisocyanate), manufactured by Wanhua Chemical, brand name TDI;
[0028] Diatomaceous earth, manufactured by Imfabi;
[0029] 3-Aminopropyltriethoxysilane and 1H,1H,2H,2H-perfluorooctyltrichlorosilane were of analytical grade and manufactured by Alfa Aesar. All materials were commercially available, commonly used products.
[0030] It is understood that the above-mentioned raw materials and reagents are merely examples of some specific embodiments of the present invention, making the technical solution of the present invention clearer, and do not mean that the present invention can only use the above-mentioned reagents. The specific scope shall be determined by the claims. In addition, unless otherwise specified, "parts" in the examples and comparative examples refer to parts by weight.
[0031] Any range described in this invention includes the endpoint, any value between the endpoints, and any subrange consisting of the endpoint or any value between the endpoints.
[0032] Example 1
[0033] Preparation of hydrophobically modified diatomaceous earth:
[0034] a. Dissolve 3-aminopropyltriethoxysilane in a mixture of ethanol and deionized water, wherein the mass of 3-aminopropyltriethoxysilane, ethanol, and deionized water are 1 g, 4 g, and 0.5 g, respectively, and adjust the pH to 5.5 with acetic acid; stir the solution at room temperature for 1.5 hours.
[0035] b. Take 10g of diatomaceous earth and calcine it at 450℃ for 4 hours. Add it to 100mL of ethanol solution and stir evenly. Then add the 3-aminopropyltriethoxysilane solution prepared above and stir at 80℃ for 10 hours.
[0036] c. Filter the particulate matter in the liquid and wash it 4 times with deionized water. Dry it in a vacuum oven at 120°C for 3 hours to obtain diatomaceous earth modified with 3-aminopropyltriethoxysilane.
[0037] d. Add 1 g of the 3-aminopropyltriethoxysilane-modified diatomaceous earth prepared above to 15 ml of hexane, and simultaneously add 0.4 g of 1H,1H,2H,2H-perfluorooctyltrichlorosilane. After stirring at room temperature for 16 hours, filter out the particulate matter, wash it three times with hexane, and then dry it in an oven at 65°C for 6 hours. The hydrophobically modified diatomaceous earth is then obtained.
[0038] Preparation of hydrophobic nylon composite materials:
[0039] 93 parts of ε-caprolactam were placed in a three-necked flask and heated until the monomer melted. A vacuum system was then connected, maintaining the flask temperature at 150°C. Vacuum was used to remove moisture and low-boiling-point impurities until all bubbles disappeared. The vacuum was restored to atmospheric pressure, and 3 parts of hydrophobically modified diatomaceous earth and 2 parts of sodium hydroxide were added. Vacuum was continued, and the reaction temperature was controlled at 140°C. Once all bubbles disappeared, the vacuum system was disconnected, and the vacuum in the three-necked flask was restored to atmospheric pressure. 2 parts of TDI were added to the flask, and the mixture was quickly stirred until homogeneous. The mixture was then poured into a mold preheated to 150°C. The mold was kept in a 150°C oven for 3 hours, then removed and allowed to cool naturally to obtain the hydrophobic nylon composite material.
[0040] Example 2
[0041] Preparation of hydrophobically modified diatomaceous earth:
[0042] a. Dissolve 3-aminopropyltriethoxysilane in a mixture of ethanol and deionized water, wherein the mass of 3-aminopropyltriethoxysilane, ethanol, and deionized water are 1 g, 3.5 g, and 0.45 g, respectively, and adjust the pH to 5.4 with acetic acid; stir the solution at room temperature for 2 hours.
[0043] b. Take 10g of diatomaceous earth and calcine it at 480℃ for 3 hours. Add it to 100mL of ethanol solution and stir evenly. Then add the 3-aminopropyltriethoxysilane solution prepared above and stir at 85℃ for 12 hours.
[0044] c. Filter the particulate matter in the liquid and wash it 5 times with deionized water. Dry it in a vacuum oven at 110°C for 2 hours to obtain diatomaceous earth modified with 3-aminopropyltriethoxysilane.
[0045] d. Add 1 g of the 3-aminopropyltriethoxysilane-modified diatomaceous earth prepared above to 15 ml of hexane, and simultaneously add 0.3 g of 1H,1H,2H,2H-perfluorooctyltrichlorosilane. After stirring at room temperature for 16 hours, filter out the particulate matter, wash it three times with hexane, and then dry it in an oven at 60°C for 6 hours. The hydrophobically modified diatomaceous earth is then obtained.
[0046] Preparation of hydrophobic nylon composite materials:
[0047] 93% ε-caprolactam was placed in a three-necked flask and heated until the monomer melted. A vacuum system was then connected, maintaining the flask temperature at 150°C. Vacuum was used to remove moisture and low-boiling-point impurities until all bubbles disappeared. The vacuum was restored to atmospheric pressure, and 4 parts of hydrophobic modified diatomaceous earth and 1.5 parts of sodium hydroxide were added. Vacuum was continued, and the reaction temperature was controlled at 140°C. Once all bubbles disappeared, the vacuum system was disconnected, and the vacuum in the three-necked flask was restored to atmospheric pressure. 1.5 parts of TDI were added to the flask, and the mixture was quickly stirred until homogeneous. The mixture was then poured into a mold preheated to 160°C. The mold was kept in a 160°C oven for 3 hours, then removed and allowed to cool naturally to obtain the hydrophobic nylon composite material.
[0048] Example 3
[0049] Preparation of hydrophobically modified diatomaceous earth:
[0050] a. Dissolve 3-aminopropyltriethoxysilane in a mixture of ethanol and deionized water, wherein the mass of 3-aminopropyltriethoxysilane, ethanol, and deionized water are 1 g, 4 g, and 0.4 g, respectively, and adjust the pH to 5.5 with acetic acid; stir the solution at room temperature for 2 hours.
[0051] b. Take 10g of diatomaceous earth and calcine it at 420℃ for 3 hours. Add it to 100mL of ethanol solution and stir evenly. Then add the 3-aminopropyltriethoxysilane solution prepared above and stir at 75℃ for 9 hours.
[0052] c. Filter the particulate matter in the liquid and wash it 5 times with deionized water. Dry it in a vacuum oven at 110°C for 4 hours to obtain diatomaceous earth modified with 3-aminopropyltriethoxysilane.
[0053] d. Add 1 g of the 3-aminopropyltriethoxysilane-modified diatomaceous earth prepared above to 20 ml of hexane, and simultaneously add 0.4 g of 1H,1H,2H,2H-perfluorooctyltrichlorosilane. After stirring at room temperature for 20 hours, filter out the particulate matter, wash it three times with hexane, and then dry it in an oven at 70°C for 6 hours. The hydrophobically modified diatomaceous earth is then obtained.
[0054] Preparation of hydrophobic nylon composite materials:
[0055] 93 parts of ε-caprolactam were placed in a three-necked flask and heated until the monomers melted. A vacuum system was then connected, maintaining the flask temperature at 130°C. Vacuum was used to remove moisture and low-boiling-point impurities until all bubbles disappeared. The vacuum was restored to atmospheric pressure, and 2 parts of hydrophobic modified diatomaceous earth and 2.5 parts of sodium hydroxide were added. Vacuum was continued, maintaining the reaction temperature at 130°C. Once all bubbles had disappeared, the vacuum system was disconnected, and the vacuum in the three-necked flask was restored to atmospheric pressure. 2.5 parts of TDI were added to the flask, and the mixture was quickly stirred until homogeneous. The mixture was then poured into a mold preheated to 150°C. The mold was kept in a 150°C oven for 3 hours, then removed and allowed to cool naturally to obtain the hydrophobic nylon composite material.
[0056] Example 4
[0057] Preparation of hydrophobically modified diatomaceous earth:
[0058] a. Dissolve 3-aminopropyltriethoxysilane in a mixture of ethanol and deionized water, wherein the mass of 3-aminopropyltriethoxysilane, ethanol, and deionized water are 1 g, 3 g, and 0.4 g, respectively, and adjust the pH to 5.2 with acetic acid; stir the solution at room temperature for 1 hour.
[0059] b. Take 10g of diatomaceous earth and calcine it at 400℃ for 2 hours. Add it to 100mL of ethanol solution and stir evenly. Then add the 3-aminopropyltriethoxysilane solution prepared above and stir at 70℃ for 8 hours.
[0060] c. Filter the particulate matter in the liquid and wash it three times with deionized water. Dry it in a vacuum oven at 100°C for 2 hours to obtain diatomaceous earth modified with 3-aminopropyltriethoxysilane.
[0061] d. Add 1 g of the 3-aminopropyltriethoxysilane-modified diatomaceous earth prepared above to 10 ml of hexane, and simultaneously add 0.2 g of 1H,1H,2H,2H-perfluorooctyltrichlorosilane. After stirring at room temperature for 12 hours, filter out the particulate matter, wash it three times with hexane, and then dry it in an oven at 60°C for 4 hours. The hydrophobically modified diatomaceous earth is then obtained.
[0062] Preparation of hydrophobic nylon composite materials:
[0063] 98.6 parts of ε-caprolactam were placed in a three-necked flask and heated until the monomers melted. A vacuum system was then connected, maintaining the flask temperature at 120°C. Vacuum was used to remove moisture and low-boiling-point impurities until all bubbles disappeared. The vacuum was restored to atmospheric pressure, and 1 part of hydrophobic modified diatomaceous earth and 0.2 parts of sodium hydroxide were added. Vacuum was continued, maintaining the reaction temperature at 120°C. Once all bubbles had disappeared, the vacuum system was disconnected, and the vacuum in the three-necked flask was restored to atmospheric pressure. 0.2 parts of TDI were added to the flask, and the mixture was quickly stirred until homogeneous. The mixture was then poured into a mold preheated to 140°C. The mold was kept in a 140°C oven for 3 hours, then removed and allowed to cool naturally to obtain the hydrophobic nylon composite material.
[0064] Example 5
[0065] Preparation of hydrophobically modified diatomaceous earth:
[0066] a. Dissolve 3-aminopropyltriethoxysilane in a mixture of ethanol and deionized water, wherein the mass of 3-aminopropyltriethoxysilane, ethanol, and deionized water are 1 g, 5 g, and 0.6 g, respectively, and adjust the pH to 5.6 with acetic acid; stir the solution at room temperature for 2 hours.
[0067] b. Take 10g of diatomaceous earth and calcine it at 500℃ for 5 hours. Add it to 100mL of ethanol solution and stir evenly. Then add the 3-aminopropyltriethoxysilane solution prepared above and stir at 90℃ for 12 hours.
[0068] c. Filter the particulate matter in the liquid and wash it 5 times with deionized water. Dry it in a vacuum oven at 130°C for 4 hours to obtain diatomaceous earth modified with 3-aminopropyltriethoxysilane.
[0069] d. Add 1 g of the 3-aminopropyltriethoxysilane-modified diatomaceous earth prepared above to 20 ml of hexane, and simultaneously add 0.5 g of 1H,1H,2H,2H-perfluorooctyltrichlorosilane. After stirring at room temperature for 24 hours, filter out the particulate matter, wash it three times with hexane, and then dry it in an oven at 70°C for 8 hours. The hydrophobically modified diatomaceous earth is then obtained.
[0070] Preparation of hydrophobic nylon composite materials:
[0071] 89 parts of ε-caprolactam were placed in a three-necked flask and heated until the monomers melted. A vacuum system was then connected, maintaining the flask temperature at 160°C. Vacuum was used to remove moisture and low-boiling-point impurities until all bubbles disappeared. The vacuum was restored to atmospheric pressure, and 5 parts of hydrophobic modified diatomaceous earth and 3 parts of sodium hydroxide were added. Vacuum was continued, maintaining the reaction temperature at 160°C. Once all bubbles had disappeared, the vacuum system was disconnected, and the vacuum in the three-necked flask was restored to atmospheric pressure. 3 parts of TDI were added to the flask, and the mixture was quickly stirred until homogeneous. The mixture was then poured into a mold preheated to 170°C. The mold was kept in a 170°C oven for 0.5 hours, then removed and allowed to cool naturally to obtain the hydrophobic nylon composite material.
[0072] Comparative Example 1
[0073] Preparation of hydrophobic nylon composite materials:
[0074] 93 parts of ε-caprolactam were placed in a three-necked flask and heated until the monomers melted. A vacuum system was then connected, maintaining the flask temperature at 150°C. Vacuum was used to remove moisture and low-boiling-point impurities until all bubbles disappeared. The vacuum was restored to atmospheric pressure, and 3 parts of commercially available hydrophobic diatomaceous earth BS-300 (Shijiazhuang Tianxu Environmental Protection Technology Co., Ltd.) and 2 parts of sodium hydroxide were added. Vacuum was continued, controlling the reaction temperature at 140°C. Once all bubbles disappeared, the vacuum system was disconnected, and the vacuum in the three-necked flask was restored to atmospheric pressure. 2 parts of TDI were added to the flask, and the mixture was quickly stirred until homogeneous. The mixture was then poured into a mold preheated to 150°C. The mold was kept in a 150°C oven for 3 hours, then removed and allowed to cool naturally to obtain the hydrophobic nylon composite material.
[0075] Comparative Example 2
[0076] Preparation of hydrophobic nylon composite materials:
[0077] 96 parts of ε-caprolactam were placed in a three-necked flask and heated until the monomer melted. A vacuum system was then connected, maintaining the flask temperature at 150°C. Vacuum was used to remove moisture and low-boiling-point impurities until all bubbles disappeared. The vacuum was restored to atmospheric pressure, and 2 parts of sodium hydroxide were added. Vacuum was continued, controlling the reaction temperature at 140°C. Once all bubbles had disappeared, the vacuum system was disconnected, and the vacuum in the three-necked flask was restored to atmospheric pressure. 2 parts of TDI were added to the flask, and the mixture was quickly stirred until homogeneous. The mixture was then poured into a mold preheated to 150°C. The mold was kept in a 150°C oven for 3 hours, then removed and allowed to cool naturally to obtain the hydrophobic nylon composite material.
[0078] Comparative Example 3:
[0079] Preparation of hydrophobic nylon composite materials:
[0080] 93 parts of ε-caprolactam were placed in a three-necked flask and heated until the monomers melted. A vacuum system was then connected, maintaining the flask temperature at 150°C. Vacuum was used to remove moisture and low-boiling-point impurities until all bubbles disappeared. The vacuum was restored to atmospheric pressure, and 0.3 parts of 3-aminopropyltriethoxysilane, 0.4 parts of 1H,1H,2H,2H-perfluorooctyltrichlorosilane, and 2.3 parts of commercially available hydrophobic diatomaceous earth BS-300 (Shijiazhuang Tianxu Environmental Protection Technology Co., Ltd.) were added. 2 parts of sodium hydroxide were added, and the vacuum was maintained at 140°C. Once all bubbles disappeared, the vacuum system was disconnected, and the vacuum in the three-necked flask was restored to atmospheric pressure. 2 parts of TDI were added to the flask, and the mixture was quickly stirred until homogeneous. The mixture was then poured into a mold preheated to 150°C. The mold was kept in a 150°C oven for 3 hours, then removed and allowed to cool naturally to obtain the hydrophobic nylon composite material.
[0081] Samples were made from the hydrophobic nylon composite materials obtained in Examples 1-5 and the composite materials obtained in Comparative Examples 1-3. The sample thickness was 20 mm. The contact angle was measured using a Kruss Co. DSA 100 water contact angle measuring instrument. The test results are shown in Table 1 below.
[0082] Table 1
[0083]
[0084] As can be seen from the test results in Table 1, the hydrophobic nylon composite material prepared by the method of the present invention has good hydrophobic properties.
[0085] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
[0086] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.
Claims
1. A method for preparing a hydrophobic nylon composite material, characterized in that, Includes the following steps: The caprolactam was placed in a container and heated to melt, then a vacuum was drawn, and the temperature inside the container was controlled at 120-160℃. Once the bubbles in the container have completely disappeared, restore the container to normal pressure, add hydrophobically modified diatomaceous earth and catalyst, continue to evacuate, and control the reaction temperature at 120-160℃. Once the bubbles in the container have completely disappeared, restore the container to normal pressure, add the catalyst, stir quickly and evenly, then pour it into a mold preheated to 140-170℃, keep it warm for 0.5-3 hours, remove it, and let it cool naturally to obtain the hydrophobic nylon composite material.
2. The method for preparing the hydrophobic nylon composite material according to claim 1, characterized in that, The hydrophobically modified diatomaceous earth was prepared by the following method: a. Dissolve 3-aminopropyltriethoxysilane in a mixture of ethanol and deionized water, then adjust the pH to 5.2-5.6, and mix thoroughly to obtain a 3-aminopropyltriethoxysilane solution; b. After calcining diatomaceous earth at 400-500℃ for 2-5 hours, add it to an ethanol solution and stir until homogeneous; then add the 3-aminopropyltriethoxysilane solution prepared in step a, and stir at 70-90℃ for 8-12 hours to obtain a mixture. c. Filter out the particulate matter in the mixture, then wash it with deionized water 3-5 times, and dry it to obtain diatomaceous earth modified with 3-aminopropyltriethoxysilane. d. Add the 3-aminopropyltriethoxysilane-modified diatomaceous earth prepared above to hexane, and simultaneously add 1H,1H,2H,2H-perfluorooctyltrichlorosilane. After stirring at room temperature for 12-24 hours, separate the particulate matter, wash it with hexane, and dry it to obtain hydrophobic modified diatomaceous earth.
3. The method for preparing the hydrophobic nylon composite material as described in claim 2, characterized in that, The mass ratio of 3-aminopropyltriethoxysilane:ethanol:deionized water is 1:(3-5):(0.4-0.6).
4. The method for preparing the hydrophobic nylon composite material as described in claim 2, characterized in that, The mass ratio of the diatomaceous earth modified with 3-aminopropyltriethoxysilane to 1H,1H,2H,2H-perfluorooctyltrichlorosilane is 10:(2-5).
5. The method for preparing the hydrophobic nylon composite material according to any one of claims 1 to 4, characterized in that, The weight ratio of caprolactam, hydrophobically modified diatomaceous earth, catalyst, and co-catalyst is (89-98.6):(1-5):(0.2-3):(0.2-3).
6. The method for preparing the hydrophobic nylon composite material according to claim 1, characterized in that, The caprolactam is ε-caprolactam with a purity of 99% or higher.
7. The method for preparing the hydrophobic nylon composite material according to claim 1, characterized in that, The catalyst is sodium hydroxide.
8. The method for preparing the hydrophobic nylon composite material according to claim 1, characterized in that, The cocatalyst is toluene diisocyanate.
9. A hydrophobic nylon composite material, characterized in that, It is prepared by any one of the preparation methods described in claims 1 to 8.