Sizing agent for bulletproof material and preparation method and application thereof

Abstract

The present invention discloses a sizing agent for bulletproof materials, its preparation method, and application, belonging to the field of functional materials. The components of the sizing agent for bulletproof materials in the present invention include an adhesive, dopamine hydrochloride, and tris(hydroxymethyl)aminomethane hydrochloride; wherein the mass ratio of the adhesive, dopamine hydrochloride, and tris(hydroxymethyl)aminomethane hydrochloride is 99.36-99.68:0.2-0.4:0.12-0.24. The sizing agent of the present invention can be used for UHMWPE fibers and, in turn, bulletproof materials. The sizing agent prepared by the present invention can be used in waterborne polyurethane adhesives; and the preparation process is simple, making it suitable for industrial use.

Description

Technical Field

[0001] The invention relates to a sizing agent for bulletproof materials and a preparation method and application thereof, belonging to the field of functional materials. Background Art

[0002] Ballistic materials are a key component in personal and vehicle protective equipment. They are typically constructed from multiple layers of high-performance fiber fabrics, such as aramid and ultra-high molecular weight polyethylene (UHMWPE). These fibers are valued for their lightweight, high strength, and impact resistance. However, to make these fibers suitable for use in ballistic equipment, they require a specific sizing treatment to enhance their mechanical properties and impact resistance.

[0003] In the field of textile composites, optimizing the sizing process to improve the surface quality, interfacial properties, mechanical properties, and flame retardancy of composite materials is a common optimization method used within the industry. Therefore, it is necessary to develop modified sizing agents that can optimize these properties to achieve the production of lightweight, high-strength fiber composites and improve the mechanical and impact resistance of composite materials in practical applications. Ideally, the modified sizing agent should meet the following requirements: ① Form a film on the fiber or fabric surface after padding; ② Improve the interfacial properties of the composite material; ③ Have a small particle size; ④ Good storage stability; ⑤ Low surface tension and good wettability.

[0004] The sizing agents used in conventional high-performance fibers mainly include modified PEEK, polyimide precursors, polyetherimide, etc., as well as solvent-based and emulsion-based sizing agents. High-performance UD laminates are often sizing with water-based adhesives, of which the most commonly used are polyurethane adhesives, and a small number are acrylic adhesives. Since the effect of acrylic adhesives during use is significantly affected by temperature and humidity, the material will crust and fall off after sizing in winter, so it accounts for a small proportion in actual use. These sizing agents play an important role in the manufacturing process of high-performance fibers. They can form a functional organic polymer layer on the surface of high-performance fibers, optimize the wear resistance, bundling, and spreading properties of the fibers, improve the wettability and bonding ability with the matrix, and thus enhance the interfacial strength of the composite material.

[0005] However, these sizing agents also have some common problems during use, mainly including:

[0006] 1. Environmental issues

[0007] Sizing agents, especially traditional oil-soluble sizing agents, contain organic solvents that are easily volatile, causing environmental pollution and affecting workers' health. Therefore, the development of water-based, organic solvent-free sizing agents has become an important research direction in the industry.

[0008] 2. Bonding issues with fibers and resins

[0009] Since sizing agents require the use of a large amount of emulsifiers, which are essentially surfactants, they may make the fiber surface easily absorb moisture and affect the bonding between the fiber and the resin.

[0010] 3. Dispersion stability issues

[0011] Water-based sizing agents prepared by traditional methods such as stirring have problems such as large emulsion particle size, unevenness, and instability, which can affect the performance of the sizing agent and the properties of the fiber.

[0012] UHMWPE fiber, also known as high-strength high-modulus polyethylene fiber, is one of the world's three major high-tech fibers (along with carbon fiber, aramid, and ultra-high molecular weight polyethylene fiber) and is considered the world's toughest fiber. UHMWPE fiber has a molecular weight between 1 million and 5 million, dozens of times that of ordinary fibers, resulting in exceptional performance. UHMWPE fiber is 15 times stronger than steel and twice as strong as carbon fiber and aramid 1414 (Kevlar). It plays a vital role in applications such as bulletproof vests, high-performance composites, ropes, and the fishing industry. However, research on sizing agents for UHMWPE fiber is limited, likely due to its unique molecular structure. UHMWPE fiber is a linear polymer composed of millions of ethylene molecules (—CH2-CH2—) with no side chains. This linear molecular structure contributes to its excellent physical and chemical properties. However, due to the smooth surface of the fiber and the relatively small number of active groups, the adhesion between the resin and the fiber is poor.

[0013] Therefore, the UHMWPE fiber sizing agent should have good dispersibility and stability to ensure that the sizing agent can be evenly and stably distributed on the UHMWPE fiber surface; it should have good interfacial compatibility to ensure that the sizing agent can effectively adhere to the fiber surface. Summary of the Invention

[0014] [Technical Issues]

[0015] Currently, no sizing agent has been found that can be used for UHMWPE fibers.

[0016] [Technical solution]

[0017] To address the above-mentioned issues, the present invention provides a sizing agent for bulletproof materials, its preparation method, and its application. Specifically, the present invention uses dopamine hydrochloride and tris(hydroxymethylaminomethane) hydrochloride to modify an adhesive to form a modified sizing agent suitable for use with UHMWPE fibers and, in turn, bulletproof materials. The sizing agent prepared in the present invention can be used in water-based polyurethane adhesives; the preparation process is simple, making it suitable for industrial use.

[0018] The first object of the present invention is to provide a sizing agent for bulletproof materials, the components of which are an adhesive, dopamine hydrochloride and tris(hydroxymethyl)aminomethane hydrochloride; wherein the mass ratio of the adhesive, dopamine hydrochloride and tris(hydroxymethyl)aminomethane hydrochloride is 99.36-99.68:0.2-0.4:0.12-0.24.

[0019] In one embodiment of the present invention, the adhesive is a water-based polyurethane adhesive.

[0020] A second object of the present invention is to provide a method for preparing a sizing agent for bullet-proof materials, comprising the steps of:

[0021] The adhesive, dopamine hydrochloride and tris(hydroxymethyl)aminomethane hydrochloride) are uniformly mixed in a mass ratio of 99.36-99.68:0.2-0.4:0.12-0.24 to react to form a mixed solution; after the reaction is completed, the mixed solution is defoamed, filtered and packaged to obtain a sizing agent for bulletproof materials.

[0022] In one embodiment of the present invention, the reaction is carried out at room temperature and pressure with stirring at 220-300 rpm for 23-25 ​​hours.

[0023] In one embodiment of the present invention, the defoaming is performed by standing.

[0024] In one embodiment of the present invention, the filtration is performed using a 0.15-0.45 μm glass fiber filter membrane.

[0025] A third object of the present invention is to provide a UHMWPE fiber for bulletproof material, which uses the sizing agent for bulletproof material of the present invention.

[0026] A fourth object of the present invention is to provide a method for sizing UHMWPE fibers using a sizing agent for bulletproof materials, comprising the following steps:

[0027] The UHMWPE fiber is placed in a sizing agent for bulletproof material, is padded, and is dried to obtain the UHMWPE fiber for bulletproof material.

[0028] In one embodiment of the present invention, the padding is performed at room temperature and pressure, with two dips and two pads, and the padding rate is 60-80%.

[0029] In one embodiment of the present invention, the drying is performed at 50-70° C. for more than 20 minutes.

[0030] A fifth object of the present invention is to provide a UHMWPE fiber composite material, which uses the sizing agent for ballistic material or the UHMWPE fiber for ballistic material of the present invention.

[0031] A sixth object of the present invention is to use the sizing agent for bullet-proof materials or the UHMWPE fiber for bullet-proof materials of the present invention in the field of protective equipment or functional materials.

[0032] A seventh object of the present invention is to provide a method for improving the interfacial compatibility between resin and UHMWPE fiber, which uses the sizing agent for bullet-proof material of the present invention.

[0033] An eighth object of the present invention is to provide a method for improving the tensile properties of UHMWPE fibers, which utilizes the sizing agent for bulletproof materials of the present invention.

[0034] [Beneficial Effects]

[0035] (1) The tris(hydroxymethyl)aminomethane hydrochloride added in the present invention plays a role in controlling the pH of the solution and maintaining the stability of the dopamine hydrochloride system.

[0036] (2) The components used in the present invention are non-toxic to the human body and have a high safety factor.

[0037] (3) The preparation process of the present invention is simple and easy to operate.

[0038] (4) The amount of sizing agent used in the present invention is reduced, thereby reducing production costs.

[0039] (5) The sizing agent of the present invention can be used for UHMWPE fibers and significantly improves the performance of UHMWPE fibers.

[0040] (6) The sizing agent of the present invention has good water-based conditions and is easy to mix with water, thereby reducing environmental pollution.

[0041] (7) The present invention can realize the in-situ growth of unidirectional polydopamine, thereby improving the adhesion and durability of the sizing agent.

[0042] (8) The sizing agent of the present invention has strong adaptability and can be used to modify the molecular chains of polymers with different structures to optimize and improve their adhesion, mechanical and other properties.

[0043] (9) The sizing agent of the present invention can be used to manufacture UHMWPE fibers or fabrics into optimized composite materials with high strength and high toughness through simple stirring and padding processes.

[0044] (10) The catechol and amino functional groups in the dopamine molecules used in the present invention give them good self-polymerization coating capabilities. Dopamine molecules interact with the surface of UHMWPE fibers through physical interactions (such as van der Waals forces, hydrogen bonds, etc.), forming a stable physical network structure through π-π bond stacking. This physical network structure changes the microscopic morphology and chemical properties of the fiber surface. In addition, since the surface of the dopamine molecules has abundant hydroxyl groups, the active groups on the fiber surface increase, and the compatibility between the fiber and the resin is improved, thereby achieving a comprehensive improvement in the fiber surface properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a SEM scanning electron microscope microscopic comparison of Example 1 and Comparative Example 1 before and after sizing.

[0046] Figure 2 Schematic diagram of a microsphere debonding test sample of a sized UHMWPE tow prepared using the sizing agent of Example 1.

[0047] Figure 3 Schematic diagram of the debonding performance test sample of the UHMWPE filament bundle after sizing prepared by the sizing agent of Example 1; (a) is a silicone mold with a reserved incision; (b) is a real picture of the TEBT sample; (c) is a schematic diagram of the TFBT sample. DETAILED DESCRIPTION

[0048] The following describes preferred embodiments of the present invention. It should be understood that the embodiments are for better explanation of the present invention and are not intended to limit the present invention.

[0049] Test method:

[0050] 1. Mechanical properties test:

[0051] The tensile test of UHMWPE tow was carried out using a QJ series microcomputer-controlled electronic universal testing machine.

[0052] The tensile test reference standard is GB / T 3362-2017 "Test method for tensile properties of carbon fiber multifilaments". The main steps are as follows:

[0053] (1) Adjust the position of the chuck on the universal testing machine by pressing the machine button so that the chuck length is greater than the sample length of the tow sample.

[0054] (2) Place the reinforcing piece at one end of the tow into the upper chuck of the testing machine in a vertical direction, and rotate the knob above the chuck to gradually tighten the upper chuck so that one end of the reinforcing piece can be clamped.

[0055] (3) Adjust the distance between the chucks so that the reinforcement piece at the other end of the tow specimen can be placed in the lower chuck of the testing machine. After ensuring that the lower reinforcement piece and the lower chuck of the testing machine are level, tighten the lower chuck of the testing machine using the knob.

[0056] (4) After clamping the reinforcing plates at both ends of the tow with the chuck, the tow can be tensile tested. The loading rate of the testing machine is 20 mm / min, and the chuck distance is 150 mm. Each sample is tested at least 5 times and the average value is taken.

[0057] 2. Contact angle test:

[0058] The hydrophilicity of the adhesive and the surface of PE woven fabric before and after modification was tested using a CA100B contact angle (water drop angle) meter.

[0059] Water contact angle test reference standard: GB / T 42694-2023 "Test and evaluation of anti-wetting properties of textile surfaces - Contact angle and rolling angle methods".

[0060] The main steps are as follows:

[0061] (1) Adjust the liquid supply device so that it absorbs an appropriate amount of reagent. If there are bubbles at the injection head, the bubbles must be discharged to ensure that there are no bubbles in the liquid supply device.

[0062] (2) Use a spirit level to level the sample table, and fix the instrument debugging sample flatly on the sample table with the test surface facing upward.

[0063] (3) Set the injection liquid volume to 5 and the injection head to be about 2 mm away from the surface of the test sample.

[0064] (4) Add (5 ± 1) μL of liquid to the surface of the instrument debugging sample, remove the injection head, adjust the camera and sample stage, so that the droplet image has a clear outline and appropriate size. When the droplet is hemispherical or nearly spherical, the droplet diameter is about 1 / 3 of the image window length.

[0065] (5) Remove the instrument debugging sample, wipe the sample table to keep it dry, install the test sample, add (5±1)uL on the sample surface, remove the injection head after the droplet, take a picture of the sample and the droplet on it when the contact time is 30s, use the measurement system to calculate the left and right contact angles of the droplet, and take the average of the two contact angles as the contact angle of the sample.

[0066] 3. Composite material interface performance test:

[0067] (1) Interface shear strength test

[0068] The interfacial shear strength between the fiber and the resin was tested by microsphere debonding experiment.

[0069] The main steps are as follows:

[0070] To prepare the microsphere debonding test sample, a single filament was removed from the UHMWPE fiber bundle and fixed to the ends of a double right-angle bracket. A certain pretension was applied to the single filament, and the pretension was maintained as consistent as possible. The epoxy resin and polyetheramine curing agent were uniformly mixed by mechanical stirring in a weight ratio of 3:1. The sample was then degassed in a vacuum environment for 15 minutes to obtain a pure, bubble-free resin sample. A small droplet of resin was transferred to the surface of the test fiber using a needle tip. Finally, the resin droplet was cured at 80°C for 2 hours. Finally, the microsphere debonding test was performed on a YG163 electronic microsphere debonding tester.

[0071] (2) Interface bonding strength test

[0072] The TFBT experiment was used to evaluate the effect of modification on the interfacial bonding performance.

[0073] The main steps are as follows:

[0074] Preparation of TFBT experimental samples: The TFBT experiment requires stretching the fiber bundle under clamping to evaluate the bonding level between the fiber and the matrix. Considering that the resin matrix of the subsequent laminate is water-based polyurethane, hard polyurethane resin is selected as the raw material to prepare the TFBT sample. At room temperature, the fiber bundle is horizontally embedded in a silicone mold with a pre-reserved incision, and a small amount of resin liquid is pre-infiltrated into the UHMWPE fiber bundle. After curing for 1 hour, the resin is poured into the mold for curing and molding. The size of the prepared TFBT specimen is 100mm*20mm*4mm. Finally, the interface bonding strength test is carried out on a 3385H electronic universal testing machine.

[0075] 4. Ballistic limit V of laminate composite materials 50 test:

[0076] Refer to GA950-2019 "Ballistic Materials and Products V 50 Test Methods" requirements;

[0077] The test uses a cylindrical wedge-shaped simulated fragment with a mass of (1.1±0.02) g as the launching projectile to evaluate the ballistic limit V50 value of the bullet-proof composite material plate with a size of 400mm×400mm.

[0078] The assessment method is:

[0079] In the effective hit shooting, take the arithmetic mean of the bullet velocity of the six measuring points with opposite results and equal number and calculate it after correction to get the V value of the sample. 50 value.

[0080] The raw materials used in the embodiment are:

[0081] Adhesive A: Water-based polyurethane adhesive, purchased from Covestro Polymers Co., Ltd., model U42;

[0082] Adhesive B: Water-based polyurethane adhesive, purchased from Covestro Polymers Co., Ltd., model UXP 2643;

[0083] Dopamine hydrochloride: chemically pure 98%, purchased from Shanghai Myril Biochemical Technology Co., Ltd.

[0084] Tris(hydroxymethyl)aminomethane hydrochloride: analytical grade 98.5%, purchased from Shanghai Myrrel Biochemical Technology Co., Ltd.;

[0085] UHMWPE tow: 1600D, purchased from Jiangsu Henghui Security Co., Ltd.

[0086] Example 1

[0087] A method for preparing a sizing agent for bullet-proof material comprises the following steps:

[0088] Adhesive A, dopamine hydrochloride, and tris(hydroxymethyl)aminomethane hydrochloride) were mixed in a mass ratio of 99.68:0.2:0.12, and stirred at 300 rpm for 24 hours at room temperature and pressure to form a mixed solution;

[0089] After the reaction is completed, the mixed solution is allowed to stand for defoaming until the foam on the surface of the solution subsides; then, impurities are removed by filtration using a 0.20 μm glass fiber filter membrane, and the mixture is packaged to obtain a sizing agent for bulletproof materials.

[0090] Example 2

[0091] A method for preparing a sizing agent for bullet-proof material comprises the following steps:

[0092] Adhesive A, dopamine hydrochloride, and tris(hydroxymethyl)aminomethane hydrochloride) were mixed in a mass ratio of 99.52:0.3:0.18, and stirred at 300 rpm for 24 hours at room temperature and pressure to form a mixed solution;

[0093] After the reaction is completed, the mixed solution is allowed to stand for defoaming until the foam on the surface of the solution subsides; then, impurities are removed by filtration using a 0.20 μm glass fiber filter membrane, and the mixture is packaged to obtain a sizing agent for bulletproof materials.

[0094] Example 3

[0095] A method for preparing a sizing agent for bullet-proof material comprises the following steps:

[0096] Adhesive B, dopamine hydrochloride, and tris(hydroxymethyl)aminomethane hydrochloride) were mixed in a mass ratio of 99.68:0.2:0.12, and stirred at 300 rpm for 24 hours at room temperature and pressure to form a mixed solution;

[0097] After the reaction is completed, the mixed solution is allowed to stand for defoaming until the foam on the surface of the solution subsides; then, impurities are removed by filtration using a 0.20 μm glass fiber filter membrane, and the mixture is packaged to obtain a sizing agent for bulletproof materials.

[0098] Example 4

[0099] A method for preparing a sizing agent for bullet-proof material comprises the following steps:

[0100] Adhesive B, dopamine hydrochloride, and tris(hydroxymethyl)aminomethane hydrochloride) were mixed in a mass ratio of 99.52:0.3:0.18, and stirred at 300 rpm for 24 hours at room temperature and pressure to form a mixed solution;

[0101] After the reaction is completed, the mixed solution is allowed to stand for defoaming until the foam on the surface of the solution subsides; then, impurities are removed by filtration using a 0.20 μm glass fiber filter membrane, and the mixture is packaged to obtain a sizing agent for bulletproof materials.

[0102] Example 5

[0103] The mass ratio of adhesive A, dopamine hydrochloride, and tris(hydroxymethyl)aminomethane hydrochloride in Example 1 was adjusted to 99.36:0.4:0.24, while other ratios remained the same as in Example 1 to obtain a sizing agent for bulletproof materials.

[0104] Comparative Example 1

[0105] Adhesive A was used directly as the sizing agent.

[0106] Comparative Example 2

[0107] Adhesive B was used directly as the sizing agent.

[0108] Comparative Example 3

[0109] The dopamine hydrochloride in Example 1 was replaced with tannic acid, and the other aspects remained the same as in Example 1 to obtain a sizing agent for bulletproof materials.

[0110] Comparative Example 4

[0111] The tris(hydroxymethyl)aminomethane hydrochloride in Example 1 was replaced with water, and the other conditions were kept the same as in Example 1 to obtain a sizing agent for bulletproof materials.

[0112] Comparative Example 5

[0113] The tris (hydroxymethyl)aminomethane hydrochloride) in Example 1 was adjusted to an ammonia-ammonium chloride buffer solution, and the other conditions were kept consistent with those in Example 1 to obtain a sizing agent for bulletproof materials.

[0114] Example 6

[0115] A method for sizing UHMWPE fibers using a sizing agent for bulletproof materials comprises the following steps:

[0116] The UHMWPE tow was dipped and sized at room temperature and pressure using a sizing agent for bulletproof materials, with two dips and two rolls, and the roll-off rate was 65%. The tow was dried in an oven at 60° C. for 30 minutes to obtain the sized UHMWPE tow.

[0117] The mechanical properties of the obtained UHMWPE tow were tested, and the contact angle of the plain fabric woven from the UHMWPE tow was tested. The test results are as follows:

[0118] As can be seen from Table 1, the mechanical properties of the sizing agent-treated tows prepared in Examples 1-5 were significantly better than those of the corresponding unmodified adhesives, and their tensile strength and elongation at break were both increased. The hydrophilicity of the sizing agent films prepared in Examples 1-5 increased, indicating that the sizing agent can effectively introduce more hydrophilic groups onto the UHMWPE fiber surface, promoting the adhesion and absorption of the sizing agent by the fibers in the tow, thereby better improving the performance of the composite material. The interfacial shear strength and interfacial bonding strength of the modified tows were significantly improved, demonstrating that the modified sizing agent has enhanced adhesion and binding force to the UHMWPE tow. The various data of Examples 1 and 4 were improved compared to Comparative Examples 1 and 2. In terms of chemical structure, Adhesive A has more hard segments and fewer soft segments, while Adhesive B has more soft segments and fewer hard segments. However, after PDA modification, the mechanical properties, interfacial properties, and hydrophilic properties of the UHMWPE tow were all improved. It can be judged that the modification method of the present invention has good adaptability to UHMWPE fiber sizing agents. The above results show that the sizing agents prepared in Examples 1-5 have the optimized characteristics of high strength, high toughness, high adaptability, etc. after being used on UHMWPE fibers, and can be fully applied to the processing and preparation of high-strength and high-elongation materials.

[0119] Table 1

[0120]

[0121] Example 7

[0122] A method for preparing a composite material laminate comprises the following steps:

[0123] The sized UHMWPE tows prepared in the examples and comparative examples were laid flat to form unidirectional UDs. Four layers of unidirectional UDs were then cross-laminated in a [0° / 90° / 0° / 90°] pattern and hot-pressed and laminated in a hot press for 10 minutes to form one UD layer. Eight UD layers were then stacked and hot-pressed and laminated in a hot press for 15 minutes to form a composite laminate.

[0124] The obtained composite material laminate was subjected to performance testing, and the test results are as follows:

[0125] Table 2

[0126] Composite laminates <![CDATA[Ballistic performance V 50 (m / s)]]> Comparative Example 1 602.53 Example 1 620.91 Example 2 601.73 Comparative Example 2 501.25 Example 3 523.29 Example 4 562.43 Example 5 592.86 Comparative Example 3 563.25 Comparative Example 4 590.23 Comparative Example 5 605.31

[0127] It can be seen from Table 2 that the ballistic performance of the composite laminates made from the sizing agent treated tows prepared in Examples 1-5 is significantly better than that of the corresponding unmodified adhesives. 50 The values ​​generally increase, and the impact resistance of the laminate is improved.

[0128] Comparative Example 6

[0129] A method for preparing sized UHMWPE tow comprises the following steps:

[0130] The UHMWPE tow was immersed in a dopamine hydrochloride solution (the mass ratio of dopamine hydrochloride to tris(hydroxymethyl)aminomethane hydrochloride was 0.2:0.12) and then taken out;

[0131] Adhesive A was used to pad sizing the impregnated UHMWPE tow at room temperature and pressure, with two dips and two pads, and the padding rate was 65%; the tow was dried in an oven at 60°C for 30 minutes to obtain the sized UHMWPE tow.

[0132] The results showed that the color of the tow was too dark and the dopamine polymerization was uneven.

[0133] Comparative Example 7

[0134] A method for preparing sized UHMWPE tow comprises the following steps:

[0135] Adhesive A was used to pad-size the UHMWPE tow at room temperature and pressure, with two dips and two pads, and the padding rate was 65%. The tow was then dried in an oven at 60°C for 30 minutes to obtain the sized UHMWPE tow.

[0136] The sized UHMWPE tow was placed in a dopamine hydrochloride solution (the mass ratio of dopamine hydrochloride to tris(hydroxymethyl)aminomethane hydrochloride was 0.2:0.12) and then taken out.

[0137] The results showed that dopamine hydrochloride could not be located on the surface of UHMWPE tow after sizing.

[0138] Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A sizing agent for bulletproof material, characterized in that: The components are adhesive, dopamine hydrochloride and tris(hydroxymethyl)aminomethane hydrochloride; The mass ratio of the adhesive, dopamine hydrochloride, and tris(hydroxymethyl)aminomethane hydrochloride is 99.36-99.68: 0.2-0.4: 0.12-0.24; The adhesive is a water-based polyurethane adhesive.

2. A method for preparing the sizing agent for bulletproof material according to claim 1, characterized in that: The steps include: The adhesive, dopamine hydrochloride and tris(hydroxymethyl)aminomethane hydrochloride) are uniformly mixed in a mass ratio of 99.36-99.68:0.2-0.4:0.12-0.24, and reacted to form a mixed solution; after the reaction is completed, the mixed solution is defoamed, filtered and packaged to obtain a sizing agent for bulletproof materials.

3. The method according to claim 2, characterized in that The reaction is carried out at room temperature and pressure with stirring at 220-300 rpm for 23-25 ​​hours.

4. The method according to claim 2, characterized in that Filtration is performed using a 0.15-0.45 μm glass fiber filter membrane.

5. A UHMWPE fiber for bulletproof material, characterized in that: The sizing agent for bullet-proof material according to claim 1 is used.

6. A method for sizing UHMWPE fibers using the sizing agent for bulletproof materials according to claim 1, characterized in that: The steps include: The UHMWPE fiber is placed in a sizing agent for bulletproof material, is padded, and is dried to obtain the UHMWPE fiber for bulletproof material.

7. The method according to claim 6, characterized in that The padding process is carried out at room temperature and pressure, with two dips and two paddings, and the padding rate is 60-80%.

8. The method according to claim 6, characterized in that Drying is carried out at 50-70°C for more than 20 minutes.

9. A UHMWPE fiber composite material, characterized in that: The sizing agent for bullet-proof material according to claim 1 or the UHMWPE fiber for bullet-proof material according to claim 5 is used.

10. Use of the sizing agent for bullet-proof material according to claim 1 and the UHMWPE fiber for bullet-proof material according to claim 5 in the field of protective equipment or functional materials.

11. A method for improving the interfacial compatibility between resin and UHMWPE fiber, characterized in that: The sizing agent for bullet-proof material according to claim 1 is used.

12. A method for improving the tensile properties of UHMWPE fibers, characterized in that: The sizing agent for bullet-proof material according to claim 1 is used.

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