Arc shield composite material based on nano silicon dioxide modification and preparation method thereof
By using nano-silica modified arc shield composite materials, combined with specific additives and preparation methods, the performance coordination and stability problems of existing materials when optimizing arc protection performance are solved, and high performance coordination and stability of materials are achieved.
Patent Information
- Application Number
- CN202510944927.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-09
- Publication Date
- 2025-09-26
AI Technical Summary
When optimizing arc protection performance, existing composite materials for face shields can easily affect their breaking strength, resulting in poor performance coordination, insufficient temperature and weather resistance, and limiting product efficiency.
Arc shield composite materials modified with nano-silica are used to optimize the performance coordination of the materials by using nano-silica modifiers, modified fillers and functional additives, including the combined use of polycarbonate, silane coupling agents, antioxidants, toughening agents, inorganic infrared blocking additives and flame retardants, and the composite materials are prepared by specific preparation methods such as ball milling and melt injection technology.
It significantly improves the arc protection performance and coordination of the breaking strength performance of the composite material, enhances the temperature change resistance and weather resistance stability, and optimizes the overall performance of the product.
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Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of composite materials, and in particular to an arc shield composite material modified based on nano-silicon dioxide and a preparation method thereof. Background Art
[0002] In the electric power, metallurgy, chemical industry and other industries, the high temperature, strong light and high-voltage shock waves generated by electric arcs cause serious harm.
[0003] In order to optimize the arc protection performance of the product, the existing face shield composite materials are prone to affecting the breaking strength performance. The product's performance coordination is poor, and its resistance to temperature changes and weathering stability is poor, which limits the product's efficiency. Summary of the Invention
[0004] In view of the defects of the prior art, the purpose of the present invention is to provide an arc shield composite material based on nano-silica modification and a preparation method thereof, so as to solve the problems raised in the above background technology.
[0005] The present invention solves the technical problem by adopting the following technical solutions: The present invention provides an arc shield composite material based on nano-silicon dioxide modification, comprising the following raw materials in parts by weight: 45-50 parts of polycarbonate, 6-10 parts of nano-silica modifier, 4-7 parts of modified filler, and 4-6 parts of functional additives.
[0006] Preferably, the functional additives are 3-5 parts of a silane coupling agent, 2-3 parts of an antioxidant, 1-2 parts of a toughening agent, 2-5 parts of an inorganic infrared blocking additive, 2-3 parts of a UV absorber, and 2-3 parts of a flame retardant; Polycarbonate is optical grade PC, transparent silicone copolymer PC and PCR-PC in a weight ratio of (3-5):1:(2-4); The flame retardant is potassium salt of fatty alcohol ether phosphate; The UV absorber is dibenzoylmethane; The inorganic infrared blocking additive is nano titanium dioxide; The silane coupling agent is silane coupling agent KH560; the antioxidant is antioxidant 1010; and the toughening agent is acrylic toughening agent MBS.
[0007] Preferably, the preparation method of the nano-silica modifier is: S01: 2-4 parts of boron nitride, 1-3 parts of yttrium oxide and 3-5 parts of bismuth titanate are mixed and added to 5-8 parts of sodium lignin sulfonate solution and stirred evenly to obtain a boron nitride solution; S02: heat-treating the nano-silica at 55-60° C. for 1 hour, and uniformly mixing 5-8 parts of the heat-treated nano-silica and 4-7 parts of the boron nitride solution to obtain a nano-silica polyhydric solution; S03: The nano-silica compounding solution and the modifying additive are mixed in a weight ratio of 5:3, and the mixture is ball-milled at a ball-milling speed of 1000-1500 r / min for 1 hour. After the ball-milling is completed, the mixture is filtered and dried to obtain the nano-silica modifier.
[0008] Nano-silica uses a special nano-ceramic powder material, and its near-infrared isolation performance is superior to that of ATO (antimony tin oxide) and ITO (indium tin oxide) materials.
[0009] Preferably, the mass fraction of the sodium lignin sulfonate solution is 5-8%.
[0010] Preferably, the preparation method of the modified additive is: The mica powder is evenly stirred in a sodium dodecylbenzene sulfonate solution which is 3-5 times the total amount of the mica powder to obtain a mica liquid. 5-8 parts of the mica liquid, 3-5 parts of wood cellulose and 3-5 parts of barium zirconate are evenly blended, filtered and dried to obtain a modified additive.
[0011] The nano-silica modifier is prepared by heat-treating the nano-silica modifier and then blending it with a boron nitride liquid. The boron nitride, yttrium oxide and bismuth titanate in the boron nitride liquid are blended and coordinated with the sodium lignin sulfonate solution. At the same time, the modified additive is improved and optimized. The mica powder in the modified additive is combined with raw materials such as wood cellulose and barium zirconate. Through the blending and coordination between the raw materials and the mutual coordination between the raw materials, the nano-silica modifier prepared in the system further optimizes the performance coordination and performance stability of the system.
[0012] Preferably, the mass fraction of the sodium dodecylbenzenesulfonate solution is 5-8%.
[0013] Preferably, the preparation method of the modified filler is: S11: 4-6 parts of nano-silica sol, 2-4 parts of sodium carboxymethyl cellulose and 5-8 parts of aluminum borate are blended and added to 8-11 parts of 5% by mass sodium citrate solution, and stirred to obtain a sol solution; S12: 3-5 parts of calcium carbonate, 2-4 parts of lanthanum oxide and 5-8 parts of sol solution are mixed and stirred, and then filtered and dried to obtain a modified filler.
[0014] The modified filler adopts raw materials such as calcium carbonate, lanthanum oxide and sol solution. The modified filler made by mutual matching and mutual assistance between the raw materials has a better coordination effect with the nano-silica modifier, thereby further improving the performance of the product.
[0015] Preferably, the stirring speed of the blending and stirring treatment is 350-400 r / min, and the stirring is performed for 1 hour.
[0016] The present invention also provides a method for preparing an arc shield composite material based on nano-silicon dioxide modification, comprising the following steps: The raw materials were weighed according to parts by weight and extruded at a temperature of 240° C. After extrusion, the raw materials were melt-injected into a face shield mold. The molded face shield was demolded using a twin-screw extruder and cooled and cleaned at a temperature of 55° C. for 1 minute to obtain a composite material.
[0017] Preferably, the melt injection pressure is 80 MPa, the mold temperature is 200-320° C., and the injection time is 20 s.
[0018] Preferably, the mold temperature is 200°C.
[0019] Compared with the prior art, the present invention has the following beneficial effects: The composite material of the present invention adopts polycarbonate and functional additives as functional additives to optimize the performance of the product. At the same time, the nano-silica modifier and modified filler are coordinated with each other. The prepared composite material has excellent coordination of arc protection performance and breaking strength performance, and is significantly resistant to temperature changes and weathering stability. DETAILED DESCRIPTION
[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0021] The arc shield composite material of this embodiment, which is modified based on nano-silicon dioxide, comprises the following raw materials in parts by weight: 45-50 parts of polycarbonate, 6-10 parts of nano-silica modifier, 4-7 parts of modified filler, and 4-6 parts of functional additives.
[0022] The functional additives of this embodiment are 3-5 parts of silane coupling agent, 2-3 parts of antioxidant, 1-2 parts of toughening agent, 2-5 parts of inorganic infrared blocking additive, 2-3 parts of ultraviolet absorber and 2-3 parts of flame retardant; Polycarbonate is optical grade PC, transparent silicone copolymer PC and PCR-PC in a weight ratio of (3-5):1:(2-4); The flame retardant is potassium salt of fatty alcohol ether phosphate; The UV absorber is dibenzoylmethane; The inorganic infrared blocking additive is nano titanium dioxide; The silane coupling agent is silane coupling agent KH560; the antioxidant is antioxidant 1010; and the toughening agent is acrylic toughening agent MBS.
[0023] The preparation method of the nano-silicon dioxide modifier of this embodiment is: S01: 2-4 parts of boron nitride, 1-3 parts of yttrium oxide and 3-5 parts of bismuth titanate are mixed and added to 5-8 parts of sodium lignin sulfonate solution and stirred evenly to obtain a boron nitride solution; S02: heat-treating the nano-silica at 55-60° C. for 1 hour, and uniformly mixing 5-8 parts of the heat-treated nano-silica and 4-7 parts of the boron nitride solution to obtain a nano-silica polyhydric solution; S03: The nano-silica compounding solution and the modifying additive are mixed in a weight ratio of 5:3, and the mixture is ball-milled at a ball-milling speed of 1000-1500 r / min for 1 hour. After the ball-milling is completed, the mixture is filtered and dried to obtain the nano-silica modifier.
[0024] The mass fraction of the sodium lignosulfonate solution in this embodiment is 5-8%.
[0025] The preparation method of the modified additive of this embodiment is: The mica powder is evenly stirred in a sodium dodecylbenzene sulfonate solution which is 3-5 times the total amount of the mica powder to obtain a mica liquid. 5-8 parts of the mica liquid, 3-5 parts of wood cellulose and 3-5 parts of barium zirconate are evenly blended, filtered and dried to obtain a modified additive.
[0026] The mass fraction of the sodium dodecylbenzenesulfonate solution in this embodiment is 5-8%.
[0027] The preparation method of the modified filler of this embodiment is: S11: 4-6 parts of nano-silica sol, 2-4 parts of sodium carboxymethyl cellulose and 5-8 parts of aluminum borate are blended and added to 8-11 parts of 5% by mass sodium citrate solution, and stirred to obtain a sol solution; S12: 3-5 parts of calcium carbonate, 2-4 parts of lanthanum oxide and 5-8 parts of sol solution are mixed and stirred, and then filtered and dried to obtain a modified filler.
[0028] The stirring speed of the blending and stirring process in this embodiment is 350-400 r / min, and the stirring is for 1 hour.
[0029] The present invention also provides a method for preparing an arc shield composite material based on nano-silicon dioxide modification, comprising the following steps: The raw materials were weighed according to parts by weight and extruded at a temperature of 240° C. After extrusion, the raw materials were melt-injected into a face shield mold. The molded face shield was demolded using a twin-screw extruder and cooled and cleaned at a temperature of 55° C. for 1 minute to obtain a composite material.
[0030] In this embodiment, the melt injection pressure is 80 MPa, the mold temperature is 200-320° C., and the injection time is 20 s.
[0031] Example 1. The arc shield composite material of this embodiment, which is modified based on nano-silicon dioxide, comprises the following raw materials in parts by weight: 45 parts of polycarbonate, 6 parts of nano-silica modifier, 4 parts of modified filler, and 4 parts of functional additives.
[0032] The functional additives of this embodiment are 3 parts of silane coupling agent, 2 parts of antioxidant, 1 part of toughening agent, 2 parts of inorganic infrared blocking additive, 2 parts of ultraviolet absorber and 2 parts of flame retardant; Polycarbonate is optical grade PC, transparent silicone copolymer PC and PCR-PC in a weight ratio of 3:1:2; The flame retardant is potassium salt of fatty alcohol ether phosphate; The UV absorber is dibenzoylmethane; The inorganic infrared blocking additive is nano titanium dioxide; The silane coupling agent is silane coupling agent KH560; the antioxidant is antioxidant 1010; and the toughening agent is acrylic toughening agent MBS.
[0033] The preparation method of the nano-silicon dioxide modifier of this embodiment is: S01: 2 parts of boron nitride, 1 part of yttrium oxide and 3 parts of bismuth titanate are mixed and added into 5 parts of sodium lignin sulfonate solution and stirred evenly to obtain a boron nitride solution; S02: heat-treating the nano-silica at 55° C. for 1 hour, and evenly mixing 5 parts of the heat-treated nano-silica and 4 parts of the boron nitride solution to obtain a nano-silica compound solution; S03: The nano-silica compounding solution and the modifying additive are mixed in a weight ratio of 5:3, and the mixture is ball-milled at a ball-milling speed of 1000 r / min for 1 hour. After the ball-milling is completed, the mixture is filtered and dried to obtain a nano-silica modifier.
[0034] The mass fraction of the sodium lignin sulfonate solution in this embodiment is 5%.
[0035] The preparation method of the modified additive of this embodiment is: The mica powder is evenly stirred in a sodium dodecylbenzene sulfonate solution with an amount 3 times the total amount of the mica powder to obtain a mica liquid. 5 parts of the mica liquid, 3 parts of wood cellulose and 3 parts of barium zirconate are evenly blended, filtered and dried to obtain a modified additive.
[0036] The mass fraction of the sodium dodecylbenzenesulfonate solution of the present embodiment is 5%.
[0037] The preparation method of the modified filler of this embodiment is: S11: 4 parts of nano-silica sol, 2 parts of sodium carboxymethyl cellulose and 5 parts of aluminum borate were blended and added into 8 parts of 5% by mass sodium citrate solution and stirred to obtain a sol solution; S12: 3 parts of calcium carbonate, 2 parts of lanthanum oxide and 5 parts of sol solution are mixed and stirred, and then filtered and dried to obtain a modified filler.
[0038] The stirring speed of the blending and stirring process in this embodiment is 350 r / min, and the stirring is performed for 1 hour.
[0039] The present invention also provides a method for preparing an arc shield composite material based on nano-silicon dioxide modification, comprising the following steps: The raw materials were weighed according to parts by weight and extruded at a temperature of 240° C. After extrusion, the raw materials were melt-injected into a face shield mold. The molded face shield was demolded using a twin-screw extruder and cooled and cleaned at a temperature of 55° C. for 1 minute to obtain a composite material.
[0040] In this embodiment, the melt injection pressure is 80 MPa, the mold temperature is 200° C., and the injection time is 20 s.
[0041] Example 2. The arc shield composite material of this embodiment, which is modified based on nano-silicon dioxide, comprises the following raw materials in parts by weight: 50 parts of polycarbonate, 10 parts of nano-silica modifier, 7 parts of modified filler, and 6 parts of functional additives.
[0042] The functional additives of this embodiment are 5 parts of silane coupling agent, 3 parts of antioxidant, 2 parts of toughening agent, 5 parts of inorganic infrared blocking additive, 3 parts of ultraviolet absorber and 3 parts of flame retardant; Polycarbonate is optical grade PC, transparent silicone copolymer PC and PCR-PC in a weight ratio of 5:1:4; The flame retardant is potassium salt of fatty alcohol ether phosphate; The UV absorber is dibenzoylmethane; The inorganic infrared blocking additive is nano titanium dioxide; The silane coupling agent is silane coupling agent KH560; the antioxidant is antioxidant 1010; and the toughening agent is acrylic toughening agent MBS.
[0043] The preparation method of the nano-silicon dioxide modifier of this embodiment is: S01: 4 parts of boron nitride, 3 parts of yttrium oxide and 5 parts of bismuth titanate are mixed and added into 8 parts of sodium lignin sulfonate solution and stirred to obtain a boron nitride solution; S02: heat-treating the nano-silica at 60° C. for 1 hour, and uniformly mixing 8 parts of the heat-treated nano-silica and 7 parts of the boron nitride solution to obtain a nano-silica compound solution; S03: The nano-silica compounding solution and the modifying additive are mixed in a weight ratio of 5:3, and the mixture is ball-milled at a speed of 1500 r / min for 1 hour. After the ball milling is completed, the mixture is filtered and dried to obtain a nano-silica modifier.
[0044] The mass fraction of the sodium lignosulfonate solution in this embodiment is 8%.
[0045] The preparation method of the modified additive of this embodiment is: The mica powder is evenly stirred in a sodium dodecylbenzene sulfonate solution with an amount 5 times the total amount of the mica powder to obtain a mica liquid. 8 parts of the mica liquid, 5 parts of wood cellulose and 5 parts of barium zirconate are evenly blended, filtered and dried to obtain a modified additive.
[0046] The mass fraction of the sodium dodecylbenzenesulfonate solution of the present embodiment is 8%.
[0047] The preparation method of the modified filler of this embodiment is: S11: 6 parts of nano-silica sol, 4 parts of sodium carboxymethyl cellulose and 8 parts of aluminum borate were blended and added into 11 parts of 5% by mass sodium citrate solution and stirred to obtain a sol solution; S12: 5 parts of calcium carbonate, 4 parts of lanthanum oxide and 8 parts of sol solution are mixed and stirred, and then filtered and dried to obtain a modified filler.
[0048] The stirring speed of the blending and stirring process in this embodiment is 400 r / min, and the stirring is performed for 1 hour.
[0049] The present invention also provides a method for preparing an arc shield composite material based on nano-silicon dioxide modification, comprising the following steps: The raw materials were weighed according to parts by weight and extruded at a temperature of 240° C. After extrusion, the raw materials were melt-injected into a face shield mold. The molded face shield was demolded using a twin-screw extruder and cooled and cleaned at a temperature of 55° C. for 1 minute to obtain a composite material.
[0050] In this embodiment, the melt injection pressure is 80 MPa, the mold temperature is 320° C., and the injection time is 20 s.
[0051] Example 3. The arc shield composite material of this embodiment, which is modified based on nano-silicon dioxide, comprises the following raw materials in parts by weight: 47.5 parts of polycarbonate, 8 parts of nano-silica modifier, 5.5 parts of modified filler, and 5 parts of functional additives.
[0052] The functional additives of this embodiment are 4 parts of silane coupling agent, 2.5 parts of antioxidant, 1.5 parts of toughening agent, 3.5 parts of inorganic infrared blocking additive, 2.5 parts of ultraviolet absorber and 2.5 parts of flame retardant; Polycarbonate is optical grade PC, transparent silicone copolymer PC and PCR-PC in a weight ratio of 4:1:3; The flame retardant is potassium salt of fatty alcohol ether phosphate; The UV absorber is dibenzoylmethane; The inorganic infrared blocking additive is nano titanium dioxide; The silane coupling agent is silane coupling agent KH560; the antioxidant is antioxidant 1010; and the toughening agent is acrylic toughening agent MBS.
[0053] The preparation method of the nano-silicon dioxide modifier of this embodiment is: S01: 3 parts of boron nitride, 2 parts of yttrium oxide and 4 parts of bismuth titanate are mixed and added to 6.5 parts of sodium lignin sulfonate solution and stirred evenly to obtain a boron nitride solution; S02: heat-treating the nano-silica at 57.5° C. for 1 hour, and uniformly mixing 6.5 parts of the heat-treated nano-silica and 5.5 parts of the boron nitride solution to obtain a nano-silica compound solution; S03: The nano-silica compounding solution and the modifying additive are mixed in a weight ratio of 5:3, and the mixture is ball-milled at a ball-milling speed of 1250 r / min for 1 hour. After the ball-milling is completed, the mixture is filtered and dried to obtain the nano-silica modifier.
[0054] The mass fraction of the sodium lignosulfonate solution in this embodiment is 6.5%.
[0055] The preparation method of the modified additive of this embodiment is: The mica powder is evenly stirred in a sodium dodecylbenzene sulfonate solution with a volume 4 times the total volume of the mica powder to obtain a mica liquid. 6.5 parts of the mica liquid, 4 parts of wood cellulose and 4 parts of barium zirconate are evenly blended, filtered and dried to obtain a modified additive.
[0056] The mass fraction of the sodium dodecylbenzenesulfonate solution in this embodiment is 6.5%.
[0057] The preparation method of the modified filler of this embodiment is: S11: 4-6 parts of nano-silica sol, 3 parts of sodium carboxymethyl cellulose and 6.5 parts of aluminum borate are mixed and added into 10 parts of 5% by mass sodium citrate solution and stirred to obtain a sol solution; S12: 4 parts of calcium carbonate, 3 parts of lanthanum oxide and 6.5 parts of sol solution are mixed and stirred, and then filtered and dried to obtain a modified filler.
[0058] The stirring speed of the blending and stirring process in this embodiment is 370 r / min, and the stirring is performed for 1 hour.
[0059] The present invention also provides a method for preparing an arc shield composite material based on nano-silicon dioxide modification, comprising the following steps: The raw materials were weighed according to parts by weight and extruded at a temperature of 240° C. After extrusion, the raw materials were melt-injected into a face shield mold. The molded face shield was demolded using a twin-screw extruder and cooled and cleaned at a temperature of 55° C. for 1 minute to obtain a composite material.
[0060] In this embodiment, the melt injection pressure is 80 MPa, the mold temperature is 200° C., and the injection time is 20 s.
[0061] Comparative Example 1. The difference from Example 3 is that no nano-silica modifier is added.
[0062] Comparative Example 2. The difference from Example 3 is that no boron nitride liquid is added in the preparation of the nano-silica modifier.
[0063] Comparative Example 3. Different from Example 3, no boron nitride or yttrium oxide was added to the boron nitride solution.
[0064] Comparative Example 4. The difference from Example 3 is that no modifying additive is added in the preparation of the nano-silica modifier.
[0065] Comparative Example 5. The difference from Example 3 is that no lignocellulose or barium zirconate is added to the modified additive.
[0066] Comparative Example 6. The difference from Example 3 is that no modified filler is added.
[0067] Comparative Example 7. The difference from Example 3 is that no calcium carbonate or lanthanum oxide is added to the modified filler.
[0068] Comparative Example 8. The difference from Example 3 is that no nano-silica sol or aluminum borate is added in the preparation of the sol solution in the modified filler.
[0069] Conventional performance tests of the products of Examples 1-3 and Comparative Examples 1-8, as well as temperature change resistance and weather resistance tests (placed at 75°C for 12 hours, then placed at -5°C for 12 hours, and finally irradiated under UV for 1 hour, UV power 350W / m ),as follows:
[0070] It can be seen from Examples 1-3 and Comparative Examples 1-8 that the latitudinal breaking strength and arc protection value of the product of Example 3 of the present invention are relatively excellent, and the product has significant temperature change resistance and weathering stability effects; however, when no nano-silica modifier or modified filler is added, the performance of the product deteriorates, among which the nano-silica modifier has the greatest impact on the product performance. In addition, the performance effects of the products prepared by different methods have a tendency to deteriorate. Only by adopting the method of the present invention, the performance effect of the product is most significant.
[0071] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.
[0072] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. A composite material for arc shielding based on nano-silicon dioxide modification, characterized in that: It includes the following raw materials in parts by weight: 45-50 parts of polycarbonate, 6-10 parts of nano-silica modifier, 4-7 parts of modified filler, and 4-6 parts of functional additives.
2. The arc shield composite material based on nano-silicon dioxide modification according to claim 1, characterized in that: The functional additives are 3-5 parts of silane coupling agent, 2-3 parts of antioxidant, 1-2 parts of toughening agent, 2-5 parts of inorganic infrared blocking additive, 2-3 parts of ultraviolet absorber and 2-3 parts of flame retardant; Polycarbonate is optical grade PC, transparent silicone copolymer PC and PCR-PC in a weight ratio of (3-5):1:(2-4); The flame retardant is potassium salt of fatty alcohol ether phosphate; The UV absorber is dibenzoylmethane; The inorganic infrared blocking additive is nano titanium dioxide; The silane coupling agent is silane coupling agent KH560; the antioxidant is antioxidant 1010; and the toughening agent is acrylic toughening agent MBS.
3. The arc shield composite material based on nano-silicon dioxide modification according to claim 1, characterized in that: The preparation method of the nano-silica modifier is: S01: 2-4 parts of boron nitride, 1-3 parts of yttrium oxide and 3-5 parts of bismuth titanate are mixed and added to 5-8 parts of sodium lignin sulfonate solution and stirred evenly to obtain a boron nitride solution; S02: heat-treating the nano-silica at 55-60° C. for 1 hour, and uniformly mixing 5-8 parts of the heat-treated nano-silica and 4-7 parts of the boron nitride solution to obtain a nano-silica polyhydric solution; S03: The nano-silica compounding solution and the modifying additive are mixed in a weight ratio of 5:3, and the mixture is ball-milled at a ball-milling speed of 1000-1500 r / min for 1 hour. After the ball-milling is completed, the mixture is filtered and dried to obtain the nano-silica modifier.
4. The arc shield composite material based on nano-silicon dioxide modification according to claim 3, characterized in that: The mass fraction of the sodium lignin sulfonate solution is 5-8%.
5. The arc shield composite material based on nano-silicon dioxide modification according to claim 2, characterized in that: The preparation method of the modified additive is: The mica powder is evenly stirred in a sodium dodecylbenzene sulfonate solution which is 3-5 times the total amount of the mica powder to obtain a mica liquid. 5-8 parts of the mica liquid, 3-5 parts of wood cellulose and 3-5 parts of barium zirconate are evenly blended, filtered and dried to obtain a modified additive.
6. The arc shield composite material based on nano-silicon dioxide modification according to claim 5, characterized in that: The mass fraction of the sodium dodecylbenzenesulfonate solution is 5-8%.
7. The arc shield composite material based on nano-silicon dioxide modification according to claim 5, characterized in that: The preparation method of the modified filler is: S11: 4-6 parts of nano-silica sol, 2-4 parts of sodium carboxymethyl cellulose and 5-8 parts of aluminum borate are blended and added to 8-11 parts of 5% by mass sodium citrate solution, and stirred to obtain a sol solution; S12: 3-5 parts of calcium carbonate, 2-4 parts of lanthanum oxide and 5-8 parts of sol solution are mixed and stirred, and then filtered and dried to obtain a modified filler.
8. The arc shield composite material modified based on nano-silicon dioxide according to claim 7, characterized in that: The stirring speed of the blending and stirring treatment is 350-400 r / min, and the stirring is for 1 hour.
9. A method for preparing an arc shield composite material based on nano-silicon dioxide modification according to any one of claims 1 to 8, characterized in that: The following steps are involved: The raw materials were weighed according to parts by weight and extruded at a temperature of 240° C. After extrusion, the raw materials were melt-injected into a face shield mold. The molded face shield was demolded using a twin-screw extruder and cooled and cleaned at a temperature of 55° C. for 1 minute to obtain a composite material.
10. The method for preparing the arc shield composite material based on nano-silicon dioxide modification according to claim 9, characterized in that: The melt injection pressure is 80 MPa, the mold temperature is 200-320° C., and the injection time is 20 s.