Anti-arc surface screen material and preparation method thereof

Abstract

The invention relates to the field of face screen materials, and particularly discloses an arc-proof face screen material and a preparation method thereof.The arc-proof face screen material is prepared from, by weight, 85%-95% of resin materials, 1%-2% of high-transparency gray master batches, 5%-10% of ethylene-methyl acrylate copolymers, 0.1%-0.5% of antioxidants and 0.05%-0.3% of lubricating agents. The preparation method of the arc-proof surface screen material comprises the following steps: mixing: uniformly mixing and stirring the resin material, the high-transparency gray master batch, the ethylene-methyl acrylate copolymer, the antioxidant and the lubricant to obtain a mixture; melting and extruding: melting and extruding the mixed material to form a plate; and machining, specifically, the plate is machined and cut, the surface of the plate is hardened, a face screen is obtained, plastic uptake hot bending is conducted on the face screen, and an arc-shaped face screen finished product conforming to ergonomics is obtained. And the obtained arc-proof surface screen has excellent light transmission, wear resistance and impact resistance.

Description

Technical Field

[0001] The present application relates to the field of face shield materials, and more specifically, to an arc-proof face shield material and a preparation method thereof. Background Art

[0002] With the continuous advancement of power grid construction and the ongoing upgrading and maintenance of power equipment, demand for arc-fighting visors, a key piece of equipment for ensuring facial safety, has steadily increased, whether in high-voltage substations, transmission line maintenance, or distribution rooms. The development of smart grids has further complicated the power operating environment, placing higher demands on the performance and functionality of arc-fighting visors. For example, the rapid development of new energy industries such as solar and wind power requires extensive electrical connections and commissioning during the installation, maintenance, and overhaul of new energy generation equipment, posing arc risks. Arc-fighting visors will become crucial protective equipment for ensuring worker safety, such as inverter maintenance in photovoltaic power plants and nacelle inspection of wind turbines. Furthermore, the production and construction and maintenance of electric vehicles and charging facilities also rely on electrical work. Arc-fighting visors can prevent arcing injuries to operators in tasks such as battery assembly and charging station installation and repair. With the explosive growth of the electric vehicle industry, their application will continue to expand.

[0003] Currently, arc-fighting visors are primarily fluorescent green. Fluorescent green is a bright and eye-catching color, and prolonged exposure to it can cause visual fatigue. When wearing an arc-fighting visor for extended periods, the constant stimulation of the fluorescent green can easily cause discomfort, affecting workers' concentration and work efficiency. In certain work scenarios, fluorescent green can interfere with color judgment. For example, in electrical maintenance work, accurate identification of the color of wires and equipment is required to determine their function and status. Fluorescent green visors can cause visual deviations, affecting accurate identification of actual colors and increasing the risk of misoperation. Workplaces containing particulate matter (such as metal debris and sand and gravel) or prolonged friction can cause wear on the visor surface, affecting vision and protective effectiveness. Furthermore, work often involves being impacted by particulate matter, sometimes at high impact velocities, which can create a risk of breakdown. The protective performance of arc-fighting visors needs to be further improved. Summary of the Invention

[0004] The present application provides an arc-proof face shield material and a preparation method thereof. The obtained arc-proof face shield has excellent light transmittance, no obvious wear on the surface after repeated friction, no obvious change in the product after being impacted by high-speed particles, and good wear resistance and impact resistance.

[0005] In the first aspect, the present application provides an arc-proof face shield material adopting the following technical solution: An arc-proof face shield material comprises the following raw materials in percentage by weight: 85-95% resin material, 1-2% high-transmittance gray masterbatch, 5-10% ethylene methyl acrylate copolymer, 0.1-0.5% antioxidant, and 0.05-0.3% lubricant; the resin material comprises one or more of polymethacrylate, acrylonitrile-styrene-butadiene copolymer, and polycarbonate.

[0006] By adopting the above-mentioned technical solution, this application uses a resin material as a matrix, providing excellent light transmittance and mechanical strength. A certain amount of high-transmittance gray masterbatch is added to adjust the visor's color, imparting a uniform gray hue. This reduces glare while maintaining high light transmittance, preventing visual interference from arc glare. The high-transmittance gray masterbatch used in the gray filter design addresses the safety concerns associated with color distortion in existing green arc-preventing visors, particularly in operational scenarios where accurate color identification of wires and equipment is required to determine their function and status.

[0007] Ethylene methyl acrylate copolymer is used as a toughening agent, enhancing the material's toughness through molecular chain flexibility and promoting interfacial bonding of the resin material. Lubricants improve component processing fluidity and enhance the material's overall performance. Antioxidants are added to enhance the visor's antioxidant properties. Combined with a high-transmittance gray masterbatch, the visor's yellowing under UV exposure can be addressed, affecting light transmittance and potentially causing blurred vision with long-term use.

[0008] Preferably, the resin material comprises polymethyl methacrylate and polycarbonate in a mass ratio of 7:(1.2-3).

[0009] By adopting the above technical solution, polymethacrylate is used to provide high light transmittance, while polycarbonate compensates for its brittleness, thereby optimizing the impact protection performance of the face shield material. The two are melt-blended to form an interpenetrating network structure; the dosage relationship of polymethyl methacrylate and polycarbonate is regulated so that the face shield material has both excellent light transmittance and mechanical properties.

[0010] Preferably, the antioxidant is a phosphite antioxidant.

[0011] Specifically, the phosphite antioxidant includes one or more of diphenyl isodecyl phosphite, tris(2,4-di-tert-butylphenyl) phosphite, and tris(mononylphenyl) phosphite.

[0012] By adopting the above technical solution and optimizing the components of phosphite antioxidants, the antioxidant capacity of the material can be effectively improved. By capturing free radicals and decomposing peroxides in the resin material during processing and use, the color of the resin material can be protected, and discoloration due to oxidation during reprocessing and use can be prevented. The stability of the material is improved, and the material can be effectively prevented from yellowing and aging.

[0013] Preferably, the lubricant is pentaerythritol stearic acid.

[0014] By adopting the above technical solution, the selection of lubricant components is optimized, the melt viscosity is reduced, the melt extrusion fluidity is improved, the processing energy consumption and mold wear are reduced, good compatibility with phosphite antioxidants is achieved, precipitation-induced surface atomization is avoided, and the transmittance is maintained.

[0015] In a second aspect, the present application provides a method for preparing an arc-proof face shield material, which adopts the following technical solution: A method for preparing an arc-proof face shield material comprises the following steps: Mixing: The resin material, high-transparency gray masterbatch, ethylene methyl acrylate copolymer, antioxidant and lubricant are mixed and stirred to obtain a mixture; Melt extrusion: The mixed material is melted at a temperature of 280-320°C and extruded into a sheet at an extrusion pressure of 100-700 bar; Processing: The plate is processed and cut and the surface of the plate is hardened to obtain a face shield, which is then thermoformed and hot-bent to obtain an ergonomic curved face shield product.

[0016] By adopting the above-mentioned technical solution, the material is melt-extruded into plates, and the plates are machined to produce a curved visor. This can increase the visor's field of view and improve the user's visual comfort, effectively resolving the issues of limited visor size and edge deformation or optical distortion caused by injection molding. Through the coordinated coordination of various raw material components and the integrated molding of the entire visor, the visor is endowed with excellent scratch resistance and greatly reduces the problem of arc protection performance degradation caused by scratches. This effectively solves the problem of arc protection performance being affected by defects (such as scratches and dents) on the curved surface of conventional visors. This visor does not require manual inspection during use, reducing enterprise maintenance costs.

[0017] Preferably, in the processing step, a hardening agent is sprayed onto the surface of the plate for hardening treatment, and the hardening agent is prepared by the following steps: uniformly mixing a silicon source solution with a nanofiller and a coupling agent, adding a catalyst to react to generate a sol, aging the sol, and then heat-treating the sol, and grinding the sol to obtain a composite material; in parts by weight, the raw material components used in the composite material are as follows: 10-20 parts of silicon source solution, 0.1-0.3 parts of coupling agent, and 1-2.5 parts of nanofiller; The composite material and polyurethane acrylate are shear-blended at a mass ratio of (1-3):8 to obtain a hardener.

[0018] A silica sol is generated by hydrolyzing a silicon source. This sol-gel reaction then forms a SiO2 network, which is then blended with polyurethane acrylate to form an organic-inorganic hybrid coating. This significantly improves the material's toughness and wear resistance, effectively addressing the problem of arc protection performance affected by conventional visor surface defects (such as scratches and dents). Spraying a hardener onto the visor surface, combined with subsequent thermoforming and heat-bending, creates a high-performance protective layer. This addresses the visor's brittleness, dents, or cracking caused by prolonged exposure to air, impact, or friction. This prevents blurring of the visor surface that can affect the user's field of vision, significantly extending the visor's lifespan.

[0019] Preferably, the step of preparing the silicon source solution comprises: dissolving one or both of methyltriethoxysilane and ethyl orthosilicate in an ethanol solution to obtain a silicon source solution.

[0020] Preferably, the nanofiller includes one or both of nano-alumina and zinc borate.

[0021] Specifically, the coupling agent is a silane coupling agent.

[0022] Specifically, the catalyst is ammonia water or sodium hydroxide.

[0023] By employing this technical solution, the silicon source solution and nanofiller are optimized to facilitate their integration into a nanoscale network structure, significantly enhancing the material's wear resistance and impact protection. The coupling agent enhances interfacial compatibility and promotes uniform dispersion of the raw material components. Zinc borate, with its flame retardancy, synergizes with the resin matrix to effectively inhibit arc diffusion, further enhancing the visor material's arc protection capabilities.

[0024] Preferably, the heat treatment temperature is 150-250° C., and the treatment time is 20-35 minutes.

[0025] By adopting the above technical solution, the heat treatment temperature and time are optimized, the dehydration condensation of the sol is promoted, a stable Si-O-Si network is formed, and the bonding strength between the filler and the matrix is enhanced. At the same time, the agglomeration or decomposition of the nanoparticles caused by excessively high temperature is avoided, thereby improving the overall performance of the hardener.

[0026] Preferably, the dimensions of the finished curved face shield are: length 40-50 cm, width 20-25 cm, face shield weight: 180-210 g, and face shield thickness: 0.8-3 mm.

[0027] In summary, this application has the following beneficial effects: 1. This application utilizes a high-transmittance gray masterbatch for a gray light filtering design, addressing the safety concerns associated with color distortion in existing green arc-proof visors. Combined with resin materials, ethylene methyl acrylate copolymer, and antioxidants, the visor material possesses excellent antioxidant and wear resistance, while maintaining high light transmittance, enabling the wearer to clearly observe their surroundings without significant visual blur or color deviation caused by the visor, thus facilitating precise operation. The high-transmittance gray visor exhibits excellent light filtering capabilities, filtering out some glare. This not only reduces eye fatigue but also improves visual comfort, enabling the wearer to maintain optimal vision during extended work.

[0028] 2. Through the coordinated combination of various raw material components and hardening treatment, as well as the integrated molding of the entire visor, the visor is endowed with excellent scratch resistance and the problem of arc protection performance degradation caused by scratches is greatly reduced. This effectively solves the problem of arc protection performance being affected by defects (such as scratches and dents) on the curved surface of conventional visors. The product has no noticeable surface wear after repeated friction and no noticeable changes after being impacted by high-speed particles, significantly improving the product's wear resistance and impact protection. DETAILED DESCRIPTION

[0029] The embodiments of the present invention will be described in detail below with reference to the examples. However, those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention. Specific conditions not specified in the examples are carried out according to conventional conditions or conditions recommended by the manufacturer. Reagents or instruments used without indicating the manufacturer are all conventional products that can be purchased commercially.

[0030] Among them: polymethacrylate, acrylonitrile-styrene-butadiene copolymer, and polycarbonate were purchased from Covestro Co., Ltd.; masterbatch model: high-transparency gray PC masterbatch, produced by Shenzhen Jinzhicheng Plastic Technology Co., Ltd.; lubricant model: POM TS-25A, manufacturer: Guangdong Molan Plastic Co., Ltd.

[0031] Hardener Preparation Example Preparation Example 1 The hardener is prepared by the following steps: Dissolve 10 g of methyltriethoxysilane in 100 mL of ethanol to obtain a silicon source solution; 10g of silicon source solution was mixed evenly with 1g of nano-alumina and 0.1g of silane coupling agent, and ammonia water as a catalyst was added to react to form a sol, which was then aged and heat-treated at 150°C for 35min, and then ground to obtain a composite material; The composite material and polyurethane acrylate were shear-blended at a mass ratio of 1:8 to obtain a hardener.

[0032] Preparation Example 2 The hardener is prepared by the following steps: Dissolve 20 g of tetraethyl orthosilicate in 100 mL of ethanol to obtain a silicon source solution; 20 g of silicon source solution was mixed evenly with 2.5 g of nanofiller and 0.3 g of silane coupling agent, and sodium hydroxide catalyst was added to react to form a sol. After aging, the sol was heat-treated at 250° C. for 20 min and ground to obtain a composite material. The nanofiller was 0.5 g of nanoalumina and 2 g of zinc borate. The composite material and polyurethane acrylate were shear-blended at a mass ratio of 3:8 to obtain a hardener.

[0033] Preparation Example 3 The hardener is prepared by the following steps: Dissolve 5 g of methyltriethoxysilane and 12 g of ethyl orthosilicate in 100 mL of ethanol to obtain a silicon source solution; 18 g of silicon source solution was mixed evenly with 2 g of nanofiller and 0.2 g of silane coupling agent, and ammonia water as a catalyst was added to react to form a sol. After aging, the sol was heat-treated at 200°C for 30 min and ground to obtain a composite material. The nanofiller was 1.3 g of nano-alumina and 0.7 g of zinc borate. The composite material and polyurethane acrylate were shear-blended at a mass ratio of 2.3:8 to obtain a hardener.

[0034] Preparation Example 4 Dissolve 15 g of ethyl orthosilicate in 100 mL of ethanol to obtain a silicon source solution; 15 g of silicon source solution, 1 g of zinc borate, and 0.12 g of silane coupling agent were mixed evenly, and ammonia water as a catalyst was added to react to form a sol. After aging, the sol was heat-treated at 120° C. for 30 min, and the composite material was obtained by grinding. The composite material and polyurethane acrylate were shear-blended at a mass ratio of 1.4:8 to obtain a hardener. Example

[0035] Example 1 The arc-proof face shield material comprises the following raw materials in percentage by weight: 88% of resin material, 1.2% of high-transmittance gray masterbatch, 10% of the hardener prepared in Preparation Example 1, 0.5% of antioxidant, and 0.3% of lubricant; The resin material is polymethyl methacrylate; the antioxidant is diphenyl isodecyl phosphite.

[0036] The method for preparing the arc-proof face shield material comprises the following steps: Mixing: Mix the resin material, high-transparency gray masterbatch, hardener, antioxidant and lubricant at room temperature for 30 minutes and stir evenly to obtain a mixture; Melt extrusion: The mixed material is melted at 300°C and extruded into a sheet at an extrusion pressure of 500 bar. Processing: The sheet is processed and thermoformed to form an ergonomic curved face shield. The finished face shield has the following dimensions: length 45cm, width 25cm, weight 200g, and thickness 2mm.

[0037] Example 2 The arc-proof face shield material comprises the following raw materials in weight percentage: 93% resin material, 1% high-transmittance gray masterbatch, 5.85% hardener prepared in Preparation Example 2, 0.1% antioxidant, and 0.05% lubricant; The resin material is polycarbonate; the antioxidant is tris(2,4-di-tert-butylphenyl) phosphite.

[0038] Example 3 The arc-proof face shield material comprises the following raw materials in weight percentage: 90% resin material, 1.5% high-transmittance gray masterbatch, 8% hardener prepared in Preparation Example 1, 0.4% antioxidant, and 0.1% lubricant; The resin material is polymethyl methacrylate and polycarbonate in a mass ratio of 7:1.2, and the antioxidant is tris(mononylphenyl) phosphite.

[0039] Example 4 The difference from Example 3 is that the hardener is the hardener prepared in Preparation Example 3, and the rest is the same as Example 3.

[0040] Example 5 The difference from Example 3 is that the hardener is the hardener prepared in Preparation Example 4, and the rest is the same as Example 3.

[0041] Example 6 The difference from Example 4 is that the resin material includes polymethyl methacrylate and acrylonitrile-styrene-butadiene copolymer in a mass ratio of 7:3, and the rest is the same as Example 4.

[0042] Example 7 The difference from Example 4 is that the resin material is polymethyl methacrylate and polycarbonate with a mass ratio of 7:2; the rest is the same as Example 4.

[0043] Comparative Example Comparative Example 1 The difference from Example 7 is that liquid polyurethane resin is used instead of the hardener, and the rest is the same as Example 7.

[0044] Comparative Example 2 The difference from Example 7 is that the hardener is prepared by the following steps: 6 g of silicon source solution, 3 g of calcium carbonate, and 0.1 g of silane coupling agent are uniformly mixed, ammonia water as a catalyst is added to react to form a sol, and after aging, heat treatment is performed at 150° C. for 35 minutes, and grinding is performed to obtain a composite material; The composite material and polyurethane acrylate were mixed and extruded at a mass ratio of 0.5:8 to obtain a hardener; The rest are the same as in Example 7.

[0045] Comparative Example 3 The difference from Example 7 is that the resin material is acrylic resin, and the rest is the same as Example 7.

[0046] Comparative Example 4 The difference from Example 7 is that the arc-proof face shield material includes the following raw materials in weight percentage: 83% resin material, 4% high-transmittance gray masterbatch, 12% ethylene methyl acrylate copolymer, 0.05% antioxidant, and 0.95% lubricant; the component raw materials are the same as those in Example 7.

[0047] Performance testing The arc protection visors prepared in Examples 1-7 and Comparative Examples 1-4 were tested for light transmittance according to ASTM D1003-2013 “Transparent Plastics Test Method for Light Transmittance and Haze”. The results are recorded in Table 1.

[0048] The finished arc-proof visors produced in Examples 1-7 and Comparative Examples 1-4 were subjected to friction testing to simulate repeated friction during use. A paper tape abrasion tester was used, with a load of 175 g and a 16-inch paper tape. The number of frictions was preset to 1000, and the machine automatically stopped. The visor surface was then inspected through a magnifying glass for scratches and coating shedding. The results are recorded in Table 1.

[0049] The arc protection visors produced in Examples 1-7 and Comparative Examples 1-4 were subjected to a high-speed particle impact protection performance test, with a particle weight of 55 g and an impact speed of 120 m / s. After the test, the surface condition of the products was observed.

[0050] Table 1 It can be seen from Examples 1-7 in combination with Table 1 that the arc-proof face shield obtained using the raw material components and specific preparation method of the present application has excellent light transmittance, no obvious wear on the surface after repeated friction, no obvious change in the product after being impacted by high-speed particles, and good wear resistance and impact protection.

[0051] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An arc-proof face shield material, characterized in that: The invention comprises the following raw materials in the following weight percentages: 85-95% of resin material, 1-2% of high-transmittance gray masterbatch, 5-10% of ethylene methyl acrylate copolymer, 0.1-0.5% of antioxidant, and 0.05-0.3% of lubricant; the resin material comprises one or more of polymethacrylate, acrylonitrile-styrene-butadiene copolymer, and polycarbonate.

2. The arc-proof face shield material according to claim 1, characterized in that: The resin material includes polymethyl methacrylate and polycarbonate in a mass ratio of 7:(1.2-3).

3. The arc-proof face shield material according to claim 1, characterized in that: The antioxidant is a phosphite antioxidant.

4. The arc-proof face shield material according to claim 1, characterized in that: The lubricant is pentaerythritol stearic acid.

5. The method for preparing the arc-proof visor material according to any one of claims 1 to 4, characterized in that: The following steps are involved: Mixing: The resin material, high-transparency gray masterbatch, ethylene methyl acrylate copolymer, antioxidant and lubricant are mixed and stirred to obtain a mixture; Melt extrusion: The mixed material is melted at a temperature of 280-320°C and extruded into a sheet at an extrusion pressure of 100-700 bar; Processing: The plate is processed and cut and the surface of the plate is hardened to obtain a face shield, which is then thermoformed and hot-bent to obtain an ergonomic curved face shield product.

6. The method for preparing the arc-proof face shield material according to claim 5, characterized in that: In the processing step, a hardener is sprayed onto the surface of the plate for hardening treatment. The hardener is prepared by the following steps: uniformly mixing a silicon source solution with a nanofiller and a coupling agent, adding a catalyst to react to generate a sol, aging the sol, heat treating the sol, and grinding the sol to obtain a composite material; the raw material components used in the composite material are used in the following amounts, in parts by weight: 10-20 parts of the silicon source solution, 0.1-0.3 parts of the coupling agent, and 1-2.5 parts of the nanofiller; The composite material and polyurethane acrylate are shear-blended at a mass ratio of (1-3):8 to obtain a hardener.

7. The method for preparing the arc-proof face shield material according to claim 6, characterized in that: The preparation step of the silicon source solution comprises: dissolving one or both of methyltriethoxysilane and ethyl orthosilicate in an ethanol solution to obtain the silicon source solution.

8. The method for preparing the arc-proof face shield material according to claim 7, characterized in that: The nano filler includes one or both of nano alumina and zinc borate.

9. The method for preparing the arc-proof face shield material according to claim 8, characterized in that: The heat treatment temperature is 150-250° C., and the treatment time is 20-35 minutes.

10. The method for preparing the arc-proof face shield material according to claim 6, characterized in that: The finished curved face screen has the following dimensions: length 40-50 cm, width 20-25 cm, face screen weight 180-210 g, and face screen thickness 0.8-3 mm.

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