Multifunctional ultra-high molecular weight polyethylene fiber composite material and method for manufacturing the same

Abstract

The application belongs to the technical field of safety protection materials, and particularly relates to a multifunctional ultra-high molecular weight polyethylene fiber composite material and a preparation method thereof, the preparation method comprising the following steps: S1: after cutting and tailoring, the ultra-high molecular weight polyethylene fiber fabric is ultrasonically cleaned, and then is treated by plasma after drying; S2: the ultra-high molecular weight polyethylene fiber fabric treated in S1 is immersed in a flame-retardant modification liquid, and then is dried after ventilation and standing; S3: the ultra-high molecular weight polyethylene fiber fabric treated in S2 is laminated with a polyurethane film, and then is hot-pressed to form an ultra-high molecular weight polyethylene fiber composite material; and S4: the ultra-high molecular weight polyethylene fiber composite material obtained in S3 is sprayed with a super-hydrophobic dispersion liquid, and then is dried and solidified to obtain a multifunctional ultra-high molecular weight polyethylene fiber composite material, wherein the composite material integrates the excellent performances of "high-efficiency flame-retardant, super-hydrophobic, impact-resistant, extremely cold protection and green environmental protection", and the comprehensive performance is far superior to that of a traditional modified fiber composite material.

Description

Technical Field

[0001] This invention belongs to the field of safety protection materials technology, specifically relating to a multifunctional ultra-high molecular weight polyethylene fiber composite material and its preparation method. Background Technology

[0002] Ultra-high molecular weight polyethylene (UHMWPE) fiber, with a molecular weight exceeding 1.5 million and a density of less than 1 g / cm³, is highly durable. 3 With its outstanding advantages of high specific strength and high toughness, it is also one of the fiber materials with the best comprehensive mechanical properties in the field of protection, and is widely used in various extreme environment protection equipment.

[0003] However, with the continuous upgrading of fields such as military protection, polar scientific research, emergency rescue, and outdoor operations, complex working conditions such as extreme high temperature, high humidity, extreme cold, and strong explosive impact are becoming more and more common. Traditional single-function protective materials can no longer meet the needs of on-site combat-oriented and integrated protection in extreme environments.

[0004] Specifically, traditional UHMWPE fibers have significant limitations in application: they have poor heat resistance and are highly flammable, spreading rapidly in the event of a fire and posing a significant fire safety hazard. Furthermore, the fiber surface is chemically inert, making it difficult to achieve hydrophobic, anti-icing, and corrosion-resistant modifications. More importantly, most conventional modification techniques can only improve flame retardancy or hydrophobicity individually, easily leading to a decline in mechanical properties. They fail to achieve a synergistic balance of flame retardancy, hydrophobicity, and impact resistance, making them unsuitable for the integrated protection requirements of extreme environments. Therefore, this study specifically developed a multifunctional ultra-high molecular weight polyethylene fiber composite material to simultaneously overcome the challenges of triple protection against fire, water, and impact. Summary of the Invention

[0005] To address the problems in existing technologies, this invention provides a multifunctional ultra-high molecular weight polyethylene fiber composite material and its preparation method, which integrates excellent properties such as "high-efficiency flame retardancy, super hydrophobicity, impact resistance, extreme cold protection, and green environmental protection." It constructs a novel two-phase flame retardant system and optimizes the preparation process. Relying on the synergistic empowerment of low surface energy components and micro-nano rough structures, the fiber composite material is endowed with excellent flame retardant properties and stable superhydrophobic characteristics, while still retaining the inherent high strength and toughness mechanical advantages of the material. The entire raw material and processing flow is simple and environmentally friendly, and all functions can be stably performed under low-temperature conditions. Its comprehensive performance is far superior to that of traditional modified fiber composite materials.

[0006] The technical problem solved by this invention is achieved by the following technical solution:

[0007] The present invention aims to provide a method for preparing a multifunctional ultra-high molecular weight polyethylene fiber composite material, comprising the following steps:

[0008] S1: After cutting the ultra-high molecular weight polyethylene fiber fabric, ultrasonically clean it, dry it, and then treat it with plasma.

[0009] S2: Immerse the ultra-high molecular weight polyethylene fiber fabric treated with S1 in flame retardant modification liquid, let it stand in the air and then dry it.

[0010] S3: The ultra-high molecular weight polyethylene fiber fabric treated in S2 is laminated with a polyurethane film and then hot-pressed to obtain an ultra-high molecular weight polyethylene fiber composite material.

[0011] S4: The ultra-high molecular weight polyethylene fiber composite material obtained in S3 is sprayed with a superhydrophobic dispersion, and then the coating is dried and cured to obtain a multifunctional ultra-high molecular weight polyethylene fiber composite material.

[0012] Furthermore, in S1, ultrasonic cleaning is performed for 10-60 minutes, drying temperature is 80-120℃, and plasma treatment is carried out in an oxygen atmosphere for 220-260 seconds, with a treatment power of 120-180W and an oxygen flow rate of 20-40 sccm.

[0013] Furthermore, in S2, the mixture is allowed to stand for 20-40 minutes under ventilation, and the drying temperature is 80-120℃. In the flame-retardant modified liquid, the solvent is deionized water, and the mass fraction of the flame retardant is 3-8%.

[0014] Further, the preparation method of the flame retardant includes: adding propargylamine to anhydrous ethanol and stirring for 3-7 min; then adding phytic acid aqueous solution dropwise at a rate of 1-3 drops per second at room temperature, and continuing to stir for 1-3 h after the addition is completed; then obtaining the crude product by vacuum filtration, washing the filter with anhydrous ethanol 2-4 times, drying the collected solid under vacuum at 70-90℃ for 20-30 h, and finally grinding to obtain the flame retardant.

[0015] Furthermore, the mass ratio of propargylamine, anhydrous ethanol and phytic acid aqueous solution is (30-40):(300-500):(60-70), and the mass fraction of phytic acid in the phytic acid aqueous solution is 40-60%.

[0016] Furthermore, in S3, the hot-pressing temperature is 100-140℃, the hot-pressing pressure is 3-7 MPa, and the hot-pressing time is 20-40 min.

[0017] Furthermore, in S4, the preparation method of the superhydrophobic dispersion includes: adding polydimethylsiloxane (PDMS) to n-hexane, stirring for 8-12 min, and ultrasonically dispersing for 8-12 min; then adding a curing agent, stirring for 8-12 min, and ultrasonically dispersing for 8-12 min; continuing to add silane-modified nano-SiO2, continuing to stir for 8-12 min, and ultrasonically dispersing for 8-12 min to obtain the superhydrophobic dispersion.

[0018] Furthermore, the mass ratio of polydimethylsiloxane, n-hexane, curing agent and silane-modified nano-SiO2 is (1-3):(20-35):(0.1-03):(1-3).

[0019] Furthermore, the silane-modified nano-SiO2 was prepared by wet modification of hexamethyldisilazane, with an average particle size of 50-100 nm.

[0020] A method for preparing a multifunctional ultra-high molecular weight polyethylene fiber composite material.

[0021] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0022] 1. The multifunctional ultra-high molecular weight polyethylene fiber composite material prepared by this invention integrates excellent properties such as "high efficiency flame retardancy, super hydrophobicity, impact resistance, extreme cold protection, and green environmental protection". It constructs a novel two-phase flame retardant system and optimizes the preparation process. Relying on the synergistic empowerment of low surface energy components and micro-nano rough structure, the fiber composite material is endowed with excellent flame retardant properties and stable superhydrophobic characteristics, while still retaining the inherent high strength and toughness mechanical advantages of the material. The entire raw material and processing flow is simple and environmentally friendly. All functions can be stably performed under low temperature conditions, and the comprehensive performance is far superior to traditional modified fiber composite materials.

[0023] 2. The "in-situ charring" two-phase flame-retardant mechanism of this invention. In the condensed phase, alkyne groups undergo chemical cross-linking reactions at high temperatures, constructing a dense and continuous three-dimensional char network that blocks the transfer of oxygen, heat, and combustible volatile components. In the gas phase, nitrogen-containing structures decompose to release N2 inert gas, diluting combustible gases, while phosphorus-containing free radicals quench the combustion chain reaction. This dual action synergistically achieves highly efficient flame retardancy.

[0024] 3. The flame retardant of the present invention is prepared by acid-base neutralization reaction of propargylamine and phytic acid. The process is simple, green and environmentally friendly, without complicated post-processing, and the product has good water solubility. It can be applied to ultra-high molecular weight polyethylene fabric systems by impregnation, coating and other methods. It has strong process adaptability and has the potential for large-scale industrial application.

[0025] 4. The surface of the ultra-high molecular weight polyethylene fiber fabric of the present invention is treated with oxygen plasma, which generates simple polar functional groups such as hydroxyl, carbonyl and carboxyl groups on the surface, thereby improving the polarity and roughness of the fiber interface and enhancing the adhesion performance of flame retardants.

[0026] 5. The coating obtained by curing the superhydrophobic dispersion of the present invention integrates the triple characteristics of "low surface energy, micro-nano roughness, and uniform dispersion of fillers", and has a highly efficient superhydrophobic effect. When the superhydrophobic dispersion is sprayed onto the surface of the fiber composite material substrate, it can give the substrate long-term stable superhydrophobic properties.

[0027] 6. The silane-modified nano-SiO2 of the present invention is obtained by wet modification of hexamethyldisilazane and prepared by blending with PDMS organosilicon matrix. The raw materials and preparation process are green and environmentally friendly, which meets the requirements of green development.

[0028] 7. The multifunctional ultra-high molecular weight polyethylene fiber composite material prepared by this invention, after flame retardant and superhydrophobic composite modification, not only improves the flame retardant performance and obtains excellent superhydrophobic performance, but also achieves simultaneous and synergistic improvement in strength and toughness, thus overcoming the drawback of traditional functional modification that inevitably leads to the loss of mechanical properties.

[0029] 8. The multifunctional ultra-high molecular weight polyethylene fiber composite material prepared by this invention does not show significant attenuation in flame retardancy, superhydrophobicity, and mechanical properties after long-term placement under extremely cold conditions of -40℃. It has excellent adaptability to low-temperature environments and can be used for long-term protective equipment in severe cold scenarios.

[0030] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the specification. Furthermore, in order to make the above contents, objectives, features and advantages of the present invention more obvious and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0031] Figure 1 The image shows a comparison of vertical combustion tests on fiber composite materials before (a) and after (b) flame retardant modification.

[0032] Figure 2 This is a static contact angle test result of the fiber composite material surface before hydrophobic modification.

[0033] Figure 3 This is a static contact angle test diagram of the surface of the hydrophobically modified fiber composite material.

[0034] Figure 4 This is a vertical combustion test diagram of the fiber composite material after flame retardant and hydrophobic modification.

[0035] Figure 5 The image shows the static contact angle test results of the fiber composite material surface after being treated in an extremely cold environment of -40℃ for 48 hours.

[0036] Figure 6 This is a comparison chart of stress-strain curves for static mechanical property testing of fiber composite materials before modification, after flame retardant modification, and after flame retardant and hydrophobic modification. Detailed Implementation

[0037] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. It should be understood that the following embodiments are merely illustrative and explanatory of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are covered within the scope of protection intended by the present invention.

[0038] In addition, unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be obtained by purchasing them from the market or prepared by existing methods.

[0039] Example 1

[0040] A method for preparing a multifunctional ultra-high molecular weight polyethylene fiber composite material includes the following steps:

[0041] S1. Cut the ultra-high molecular weight polyethylene fiber fabric into a regular size of 480 mm × 320 mm and immerse it in a tray containing anhydrous ethanol. Clean it under ultrasonic action for 15 min, repeat twice, and then place it in a forced-air drying oven at 100℃ until it is dry. Then, perform plasma treatment in an oxygen atmosphere for 240 s, with a treatment power of 150 W and an oxygen flow rate of 30 sccm.

[0042] S2. The ultra-high molecular weight polyethylene fiber fabric treated in step S1 is completely immersed in an iron pan containing flame retardant modification liquid. The solvent used in the flame retardant modification liquid is 70g of deionized water, and the amount of flame retardant added is 4g. After the iron pan is placed in a fume hood and left to stand for 30 minutes, it is then placed in a forced-air drying oven at 100℃ and dried until dry.

[0043] S3. The ultra-high molecular weight polyethylene fiber fabric treated in step S2 is stacked with a polyurethane film slightly larger than the fabric, and the whole thing is placed in a hot press covered with silicone paper. The hot pressing temperature is set to 120℃, the hot pressing pressure is 5 MPa, and the hot pressing time is 30 min. The hot pressing is formed to obtain the ultra-high molecular weight polyethylene fiber composite material.

[0044] S4. The ultra-high molecular weight polyethylene fiber composite material treated in step S3 is sprayed with a superhydrophobic dispersion and then placed in a forced-air drying oven at 60°C until the coating is cured to obtain a multifunctional ultra-high molecular weight polyethylene fiber composite material.

[0045] The flame retardant in the above-mentioned flame-retardant modified liquid is prepared by the following method:

[0046] 36.3 g of propargylamine was added to a beaker containing 400 g of anhydrous ethanol and stirred for 5 min. Then, 66 g of phytic acid aqueous solution (mass fraction of 50%) was added dropwise at a rate of one drop per second at room temperature using a dropping funnel. After the addition was completed, the mixture was stirred for 2 h. The crude product was then obtained by vacuum filtration, washed with anhydrous ethanol three times, and the collected solid was vacuum dried at 80 °C for 24 h. Finally, the solid was ground to obtain the flame retardant.

[0047] The above-mentioned superhydrophobic dispersion was prepared by the following method:

[0048] Add 1g PDMS to 20g n-hexane, stir for 10min, and ultrasonically disperse for 10min; then add 0.1g curing agent, stir for 10min, and ultrasonically disperse for 10min; then add 1g silane-modified nano SiO2 (average particle size of 50nm), stir for 10min, and ultrasonically disperse for 10min to obtain a superhydrophobic dispersion.

[0049] Example 2

[0050] A method for preparing a multifunctional ultra-high molecular weight polyethylene fiber composite material includes the following steps:

[0051] S1. Cut the ultra-high molecular weight polyethylene fiber fabric into a regular size of 480 mm × 320 mm and immerse it in a tray containing anhydrous ethanol. Clean it under ultrasonic action for 20 min, repeat 3 times, and then place it in a forced-air drying oven at 120℃ until dry. Then, perform plasma treatment in an oxygen atmosphere for 260 s, with a treatment power of 180 W and an oxygen flow rate of 40 sccm.

[0052] S2. The ultra-high molecular weight polyethylene fiber fabric treated in step S1 is completely immersed in an iron pan containing flame retardant modification liquid. The solvent used in the flame retardant modification liquid is 65g of deionized water, and the amount of flame retardant added is 2.5g. After the iron pan is placed in a fume hood and left to stand for 40 minutes, it is then placed in a forced-air drying oven at 120℃ and dried until dry.

[0053] S3. The ultra-high molecular weight polyethylene fiber fabric treated in step S2 is stacked with a polyurethane film slightly larger than the fabric, and the whole thing is placed in a hot press covered with silicone paper. The hot pressing temperature is set to 140℃, the hot pressing pressure is 7 MPa, and the hot pressing time is 40 min. The hot pressing is formed to obtain the ultra-high molecular weight polyethylene fiber composite material.

[0054] S4. The ultra-high molecular weight polyethylene fiber composite material treated in step S3 is sprayed with a superhydrophobic dispersion and then placed in a forced-air drying oven at 80°C until the coating is cured to obtain a multifunctional ultra-high molecular weight polyethylene fiber composite material.

[0055] The flame retardant in the above-mentioned flame-retardant modified liquid is prepared by the following method:

[0056] 72.6 g of propargylamine was added to a beaker containing 900 g of anhydrous ethanol and stirred for 7 min. Then, 132 g of phytic acid aqueous solution (mass fraction of 60%) was added dropwise at a rate of one drop every 3 s using a dropping funnel at room temperature. After the addition was completed, the mixture was stirred for 3 h. The crude product was then obtained by vacuum filtration, washed with anhydrous ethanol four times, and the collected solid was vacuum dried at 90 °C for 30 h. Finally, the solid was ground to obtain the flame retardant.

[0057] The above-mentioned superhydrophobic dispersion was prepared by the following method:

[0058] Add 2g of PDMS to 65g of n-hexane, stir for 12min, and ultrasonically disperse for 12min; then add 0.2g of curing agent, stir for 12min, and ultrasonically disperse for 12min; then add 2g of silane-modified nano-SiO2 (average particle size of 50nm), stir for 12min, and ultrasonically disperse for 12min to obtain a superhydrophobic dispersion.

[0059] Example 3

[0060] A method for preparing a multifunctional ultra-high molecular weight polyethylene fiber composite material includes the following steps:

[0061] S1. Cut the ultra-high molecular weight polyethylene fiber fabric into a regular size of 480 mm × 320 mm and immerse it in a tray containing anhydrous ethanol. Clean it under ultrasonic action for 10 min, repeat 3 times, and then place it in a forced-air drying oven at 80℃ until it is dry. Then, perform plasma treatment in an oxygen atmosphere for 220 s, with a treatment power of 120 W and an oxygen flow rate of 20 sccm.

[0062] S2. The ultra-high molecular weight polyethylene fiber fabric treated in step S1 is completely immersed in an iron pan containing flame retardant modification liquid. The solvent used in the flame retardant modification liquid is 60g of deionized water and the amount of flame retardant added is 5g. After the iron pan is placed in a fume hood and left to stand for 20 minutes, it is then placed in a forced-air drying oven at 80℃ and dried until dry.

[0063] S3. The ultra-high molecular weight polyethylene fiber fabric treated in step S2 is stacked with a polyurethane film slightly larger than the fabric, and the whole thing is placed in a hot press covered with silicone paper. The hot pressing temperature is set to 100℃, the hot pressing pressure is 3 MPa, and the hot pressing time is 20 min. The hot pressing is formed to obtain the ultra-high molecular weight polyethylene fiber composite material.

[0064] S4. The ultra-high molecular weight polyethylene fiber composite material treated in step S3 is sprayed with a superhydrophobic dispersion and then placed in a forced-air drying oven at 50°C until the coating is cured to obtain a multifunctional ultra-high molecular weight polyethylene fiber composite material.

[0065] The flame retardant in the above-mentioned flame-retardant modified liquid is prepared by the following method:

[0066] 36.3 g of propargylamine was added to a beaker containing 350 g of anhydrous ethanol and stirred for 3 min. Then, 66 g of phytic acid aqueous solution (mass fraction of 40%) was added dropwise at a rate of one drop per second at room temperature using a dropping funnel. After the addition was completed, the mixture was stirred for 1 h. The crude product was then obtained by vacuum filtration, washed twice with anhydrous ethanol, and the collected solid was vacuum dried at 70 °C for 20 h. Finally, the solid was ground to obtain the flame retardant.

[0067] The above-mentioned superhydrophobic dispersion was prepared by the following method:

[0068] Add 1.2g PDMS to 36g n-hexane, stir for 8 minutes, and then sonicate for 8 minutes; then add 0.12g curing agent, stir for 8 minutes, and sonicate for 8 minutes; then add 1.2g silane-modified nano-SiO2 (average particle size of 50nm), stir for 8 minutes, and sonicate for 8 minutes to obtain a superhydrophobic dispersion.

[0069] Example 4

[0070] A method for preparing a multifunctional ultra-high molecular weight polyethylene fiber composite material includes the following steps:

[0071] S1. Cut the ultra-high molecular weight polyethylene fiber fabric into a regular size of 480 mm × 320 mm and immerse it in a tray containing anhydrous ethanol. Clean it under ultrasonic action for 15 min, repeat twice, and then place it in a forced-air drying oven at 90℃ until dry. Then, perform plasma treatment in an oxygen atmosphere for 230 s, with a treatment power of 140 W and an oxygen flow rate of 30 sccm.

[0072] S2. The ultra-high molecular weight polyethylene fiber fabric treated in step S1 is completely immersed in an iron pan containing flame retardant modification liquid. The solvent used in the flame retardant modification liquid is 70g of deionized water, and the amount of flame retardant added is 4g. After the iron pan is placed in a fume hood and left to stand for 30 minutes, it is then placed in a forced-air drying oven at 90°C and dried until dry.

[0073] S3. The ultra-high molecular weight polyethylene fiber fabric treated in step S2 is stacked with a polyurethane film slightly larger than the fabric, and the whole thing is placed in a hot press covered with silicone paper. The hot pressing temperature is set to 110℃, the hot pressing pressure is 4 MPa, and the hot pressing time is 30 min. The hot pressing is formed to obtain the ultra-high molecular weight polyethylene fiber composite material.

[0074] S4. The ultra-high molecular weight polyethylene fiber composite material treated in step S3 is sprayed with a superhydrophobic dispersion and then placed in a forced-air drying oven at 60°C until the coating is cured to obtain a multifunctional ultra-high molecular weight polyethylene fiber composite material.

[0075] The flame retardant in the above-mentioned flame-retardant modified liquid is prepared by the following method:

[0076] 36.3 g of propargylamine was added to a beaker containing 400 g of anhydrous ethanol and stirred for 6 min. Then, 66 g of phytic acid aqueous solution (mass fraction of 50%) was added dropwise at a rate of one drop every 2 s using a dropping funnel at room temperature. After the addition was completed, the mixture was stirred for 2 h. The crude product was then obtained by vacuum filtration, washed with anhydrous ethanol three times, and the collected solid was vacuum dried at 80 °C for 24 h. Finally, the solid was ground to obtain the flame retardant.

[0077] The above-mentioned superhydrophobic dispersion was prepared by the following method:

[0078] Add 1.2g PDMS to 36g n-hexane, stir for 8min, and ultrasonically disperse for 11min; then add 0.12g curing agent, stir for 9min, and ultrasonically disperse for 9min; then add 1.2g silane-modified nano-SiO2 (average particle size of 100nm), stir for 8min, and ultrasonically disperse for 8min to obtain a superhydrophobic dispersion.

[0079] The preparation method of silane-modified nano-SiO2 in this invention is as follows:

[0080] Typically, 2 g of nano-SiO2 powder (average particle size 50-100 nm) is added to a three-necked flask, stirred, heated to 120 °C, and held at that temperature for 50 min; then 40 g of anhydrous ethanol is added, and stirred for 10 min; then 8 g of hexamethyldisilazane is added, and the temperature is raised to 120 °C and held at that temperature for 50 min; after the reaction is complete, the powder is washed three times by centrifugation with anhydrous ethanol, and dried to constant weight to finally obtain silane-modified nano-SiO2.

[0081] To demonstrate the superiority of the multifunctional ultra-high molecular weight polyethylene fiber composite material of the present invention, the following comparative examples are provided:

[0082] Comparative Example 1

[0083] The difference between Comparative Example 1 and Example 1 is that the flame-retardant modification liquid treatment process in step S2 and the superhydrophobic dispersion spraying process in step S4 were omitted during the preparation process. The remaining steps are exactly the same as those in Example 1.

[0084] Comparative Example 2

[0085] The difference between Comparative Example 1 and Example 1 is that the spraying process of the superhydrophobic dispersion in step S4 was omitted during the preparation process, while the remaining steps were exactly the same as in Example 1.

[0086] Comparative Example 3

[0087] The difference between Comparative Example 1 and Example 1 is that the treatment process of flame retardant modified liquid in step S2 was omitted during the preparation process, while the remaining steps are exactly the same as in Example 1.

[0088] The performance test results of the ultra-high molecular weight polyethylene fiber composite materials prepared in Examples 1-4 and Comparative Examples 1-3 are shown in Table 1 below.

[0089] Table 1

[0090]

[0091] As shown in Table 1, the flame retardant properties of ultra-high molecular weight polyethylene fiber composite materials increase with the increase of flame retardant content; when the flame retardant content reaches 4 g, the afterflame time of the sample is 0 s, and the vertical burning rating reaches B1. Combined with... Figure 1 and Figure 4 It can be observed that Comparative Example 1 dripped material during vertical combustion and ignited the cotton; Example 1 did not drip material and did not ignite the cotton during vertical combustion test; After being treated in an extremely cold environment of -40℃ for 48 hours, the combustion performance of Example 1 still maintained the B1 level, and the flame retardant performance was stable and reliable.

[0092] Combining the static contact angle test data in Table 1 with Figure 2 and Figure 3 As can be seen, the water contact angle of Comparative Example 1 at room temperature is only 107°, while that of Example 1 reaches 154°, indicating that the superhydrophobic dispersion prepared in this invention can impart superhydrophobic properties to ultra-high molecular weight polyethylene fiber composites; combined with Figure 5 After being treated in an extremely cold environment of -40℃ for 48 hours, the contact angle of Example 1 still remained at 153°, and the hydrophobic performance was stable and reliable.

[0093] Combining the static mechanical performance test data in Table 1 with Figure 6As can be seen, the tensile strength of Comparative Example 1 is 313.6 MPa, and that of Comparative Example 2 is 384.8 MPa, indicating that the addition of flame retardant in this invention does not reduce the tensile properties of the composite material and can also improve the load-bearing capacity of the material; the tensile strength of Example 1 is 367.1 MPa, indicating that the dual modification treatment of flame retardancy and superhydrophobicity in this invention can achieve synergistic enhancement of the material's strength and toughness.

[0094] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0095] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A method for preparing a multifunctional ultra-high molecular weight polyethylene fiber composite material, characterized in that, Includes the following steps: S1: After cutting the ultra-high molecular weight polyethylene fiber fabric, ultrasonically clean it, dry it, and then treat it with plasma. S2: Immerse the ultra-high molecular weight polyethylene fiber fabric treated with S1 in flame retardant modification liquid, let it stand in the air and then dry it. S3: The ultra-high molecular weight polyethylene fiber fabric treated in S2 is laminated with a polyurethane film and then hot-pressed to obtain an ultra-high molecular weight polyethylene fiber composite material. S4: The ultra-high molecular weight polyethylene fiber composite material obtained in S3 is sprayed with a superhydrophobic dispersion, and then the coating is dried and cured to obtain a multifunctional ultra-high molecular weight polyethylene fiber composite material.

2. The preparation method of the multifunctional ultra-high molecular weight polyethylene fiber composite material as described in claim 1, characterized in that: In S1, ultrasonic cleaning is performed for 10-60 minutes, drying temperature is 80-120℃, and plasma treatment is carried out in an oxygen atmosphere for 220-260 seconds, with a treatment power of 120-180W and an oxygen flow rate of 20-40 sccm.

3. The preparation method of the multifunctional ultra-high molecular weight polyethylene fiber composite material as described in claim 1, characterized in that: In S2, allow to stand under ventilation for 20-40 minutes, and dry at 80-120℃. In the flame-retardant modified liquid, the solvent is deionized water, and the mass fraction of the flame retardant is 3-8%.

4. The preparation method of the multifunctional ultra-high molecular weight polyethylene fiber composite material as described in claim 3, characterized in that: The preparation method of the flame retardant includes: adding propargylamine to anhydrous ethanol and stirring for 3-7 min; then adding phytic acid aqueous solution dropwise at a rate of 1-3 drops per second at room temperature, and continuing to stir for 1-3 h after the addition is completed; then obtaining the crude product by vacuum filtration, washing the filter with anhydrous ethanol 2-4 times, drying the collected solid under vacuum at 70-90℃ for 20-30 h, and finally grinding to obtain the flame retardant.

5. The preparation method of the multifunctional ultra-high molecular weight polyethylene fiber composite material as described in claim 4, characterized in that: The mass ratio of propargylamine, anhydrous ethanol and phytic acid aqueous solution is (30-40):(300-500):(60-70), and the mass fraction of phytic acid in the phytic acid aqueous solution is 40-60%.

6. The method for preparing a multifunctional ultra-high molecular weight polyethylene fiber composite material as described in claim 1, characterized in that: In S3, the hot-pressing temperature is 100-140℃, the hot-pressing pressure is 3-7 MPa, and the hot-pressing time is 20-40 min.

7. The preparation method of the multifunctional ultra-high molecular weight polyethylene fiber composite material as described in claim 1, characterized in that: In S4, the preparation method of the superhydrophobic dispersion includes: adding polydimethylsiloxane to n-hexane, stirring for 8-12 minutes, and ultrasonically dispersing for 8-12 minutes; then adding a curing agent, stirring for 8-12 minutes, and ultrasonically dispersing for 8-12 minutes; continuing to add silane-modified nano-SiO2, stirring for 8-12 minutes, and ultrasonically dispersing for 8-12 minutes to obtain the superhydrophobic dispersion.

8. The method for preparing a multifunctional ultra-high molecular weight polyethylene fiber composite material as described in claim 7, characterized in that: The mass ratio of polydimethylsiloxane, n-hexane, curing agent and silane-modified nano-SiO2 is (1-3):(20-35):(0.1-03):(1-3).

9. The method for preparing a multifunctional ultra-high molecular weight polyethylene fiber composite material as described in claim 7, characterized in that: Silane-modified nano-SiO2 was prepared by wet modification with hexamethyldisilazane, with an average particle size of 50-100 nm.

10. The multifunctional ultra-high molecular weight polyethylene fiber composite material prepared by the preparation method of any one of claims 1-9.

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