Insulating material with corrosion resistance and production process thereof

Abstract

The invention discloses an insulating material with corrosion resistance and a production process thereof, and relates to the technical field of insulating materials. The invention discloses an insulating material with corrosion resistance. The invention discloses a flame-retardant coating which is prepared from the following raw materials in parts by weight: 60 to 80 parts of bisphenol A epoxy resin, 20 to 30 parts of polyether-ether-ketone, 10 to 15 parts of nano aluminum nitride, 5 to 10 parts of boron fiber, 4 to 8 parts of molybdenum disulfide, 3 to 6 parts of poly (p-phenylene benzobisoxazole), 2 to 5 parts of vinyl trimethoxy silane, 20 to 30 parts of dimethyl sulfoxide, 8 to 12 parts of melamine cyanurate, 6 to 10 parts of magnesium aluminum hydroxide, 1 to 3 parts of Chimassorb 944 and 10 to 20 parts of modified polyvinyl alcohol. The coating is prepared from the following components in parts by weight: 20-30 parts of modified cellulose, 8-15 parts of modified cellulose, 3-7 parts of nano-zirconia, 5-10 parts of polysiloxane elastomer and 7-12 parts of fluorine-containing acrylate copolymer. The raw materials of the insulating material have a synergistic effect, and the prepared insulating material not only has conventional electrical insulation, but also has excellent heat resistance, corrosion resistance and the like, integrates hardness, flexibility, flame retardance and self-repairing performance, greatly expands the application range of the insulating material, and provides powerful support for industry development.

Description

Technical Field

[0001] The present invention relates to the technical field of insulating materials, in particular to an insulating material with corrosion resistance and a production process thereof. Background Art

[0002] With the rapid development of modern science and technology and industry, the application areas of insulation materials continue to expand. From common electrical equipment to high-end precision instruments in cutting-edge fields such as deep-sea exploration and aerospace, insulation materials are indispensable. This has led to increasingly stringent performance requirements for insulation materials, and the limitations of traditional insulation materials have become increasingly significant, making it difficult to meet current practical needs.

[0003] In chemical production environments, insulation materials are exposed to long-term contact with various strong acids, strong bases, and corrosive chemicals. For example, in the chlor-alkali industry, insulation components are frequently corroded by highly alkaline electrolytes. In marine environments, high-salinity seawater and humid air continuously act on insulation materials. Under these highly corrosive conditions, the insulation performance of traditional insulation materials rapidly degrades, easily leading to problems such as leakage and short circuits. This not only jeopardizes the safe operation of equipment, but also significantly shortens its lifespan and increases maintenance costs.

[0004] In specialized operating environments like high-temperature industrial furnaces and nuclear reactors, the shortcomings of traditional insulation materials in heat and radiation resistance become apparent. High temperatures damage the material's internal structure, reducing its mechanical and insulation properties; high radiation levels alter the material's molecular structure, accelerating aging and causing performance degradation. For example, in a nuclear reactor, insufficient radiation resistance can lead to insulation failure, impacting the reactor's stable operation.

[0005] In addition, it is difficult for traditional insulating materials to balance multiple properties. In terms of mechanical properties, it is difficult to balance hardness and flexibility, and they cannot adapt to complex stress environments; in terms of electrical properties, it is difficult to achieve high dielectric strength and low dielectric loss at the same time; chemical stability is also poor, and it is difficult to resist corrosion from a variety of chemical substances. In the aerospace field, aircraft have extremely high requirements for insulation materials. Not only do they require excellent electrical insulation properties, but they also require the materials to remain stable under harsh conditions such as extreme temperatures and high radiation. Therefore, it is urgent to develop insulating materials that have multiple excellent properties such as corrosion resistance, heat resistance, and radiation resistance. This is of great significance to promoting technological progress in various fields and ensuring the safe and stable operation of equipment. Summary of the Invention

[0006] In view of the deficiencies in the prior art, the present invention provides an insulating material with corrosion resistance and a production process thereof, which solves the above-mentioned problems.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A corrosion-resistant insulating material comprises the following raw materials in parts by weight: 60-80 parts of bisphenol A epoxy resin, 20-30 parts of polyetheretherketone, 10-15 parts of nano-aluminum nitride, 5-10 parts of boron fiber, 4-8 parts of molybdenum disulfide, 3-6 parts of poly(p-phenylene benzobisoxazole), 2-5 parts of vinyltrimethoxysilane, 20-30 parts of dimethyl sulfoxide, 8-12 parts of melamine cyanurate, 6-10 parts of magnesium aluminum hydroxide, 1-3 parts of Chimassorb 944, 10-20 parts of modified polyvinyl alcohol, 8-15 parts of modified cellulose, 3-7 parts of nano-zirconium oxide, 5-10 parts of polysiloxane elastomer, and 7-12 parts of fluorine-containing acrylate copolymer.

[0009] Furthermore, the modified polyvinyl alcohol is specifically prepared in the following steps:

[0010] A1. Add polyvinyl alcohol to deionized water and stir at 85°C until completely dissolved. After stirring, cool to 50°C, add aqueous p-toluenesulfonic acid solution to adjust the pH to 4, and then slowly add dropwise a mixed solution D of methyltrimethoxysilane and n-octyltriethoxysilane diluted with anhydrous ethanol. After the addition is complete, heat the system to 65°C and continue stirring for 4 hours. After the reaction is complete, add triethylamine to adjust the pH to 7. Pour the solution into acetone for precipitation. Collect the solid product by filtration, wash, and dry to obtain intermediate product 1.

[0011] A2. Add intermediate product 1 to N,N-dimethylformamide and ultrasonically disperse for 30 minutes to form a uniform dispersion; add nano-silicon carbide, graphene quantum dots and sodium dodecylbenzenesulfonate to the dispersion in sequence, raise the temperature to 70°C under nitrogen protection, stir and react for 3 hours, then add dibenzoyl peroxide and continue stirring and reacting for 1 hour; after the reaction, pour the product into deionized water for precipitation, filter, wash and dry to obtain intermediate product 2;

[0012] A3. Add the intermediate product 2 to tetrahydrofuran, heat to 60°C and stir to dissolve, then add polycaprolactone-polyethylene glycol block copolymer, sodium borohydride and triethylamine, and stir and react at 80°C for 3 hours. After the reaction is completed, slowly add glacial acetic acid dropwise to terminate the reaction and adjust the pH to 6; pour the solution into a large amount of deionized water for precipitation, then centrifuge and pour out the supernatant. After the product is completely centrifuged, wash the precipitate and dry it to obtain modified polyvinyl alcohol.

[0013] Furthermore, in step A1, the amount ratio of polyvinyl alcohol, deionized water, mixed solution D, and acetone is 15g:200mL:10mL:500mL; the mixed solution D is a mixed solution of 3g methyltrimethoxysilane and 2g n-octyltriethoxysilane diluted with 10mL of anhydrous ethanol; the concentration of the aqueous p-toluenesulfonic acid solution is 0.1mol / L; the dropping speed is controlled at 2mL / min; the stirring speed is 300r / min; the product is washed three times with deionized water and dried at 60°C for 12h.

[0014] Furthermore, in step A2, the amount ratio of N,N-dimethylformamide, nano-silicon carbide, graphene quantum dots, sodium dodecylbenzenesulfonate, and dibenzoyl peroxide is 150 mL: 5 g: 1 g: 0.2 g: 0.5 g; the stirring speed is 200 r / min; the nitrogen flow rate is maintained at 50 mL / min; after filtration, it is washed with ethanol three times and dried at 80°C for 24 h.

[0015] Furthermore, in step A3, the ratio of tetrahydrofuran, polycaprolactone-polyethylene glycol block copolymer, sodium borohydride and triethylamine is 100 mL: 4 g: 2 g: 2 mL; centrifugation is performed at 8000 r / min, with each centrifugation for 10 minutes; the precipitate is washed three times with deionized water and dried at 50° C. for 48 hours.

[0016] In step A1, under acidic conditions, the alkoxy groups in the silane hydrolyze to form silanol groups. These silanol groups then undergo a condensation reaction with the hydroxyl groups on the polyvinyl alcohol (PVA) chains, grafting the organosilane onto the PVA chains. The introduction of the organosilane enhances the material's water resistance because the alkyl groups in the silane are hydrophobic, reducing water intrusion. Silanol groups can also condense with each other, forming -Si-O-Si- bonds, which crosslink the molecular chains and enhance the overall stability and strength of the material.

[0017] In step A2, dibenzoyl peroxide decomposes to produce free radicals, initiating a free radical polymerization reaction between nano-silicon carbide, graphene quantum dots, and polyvinyl alcohol (PVA) molecular chains, resulting in uniform dispersion of the nanomaterials and their bonding with the PVA molecules. Nano-silicon carbide's high hardness enhances the material's hardness and wear resistance. Graphene quantum dots possess excellent electrical and thermal properties, improving the material's electrical and thermal conductivity and mechanical properties. Sodium dodecylbenzenesulfonate, acting as a surfactant, aids in the dispersion of the nanomaterials and enhances their compatibility with PVA, thereby improving the material's overall performance.

[0018] In step A3, the polyethylene glycol segments in the polycaprolactone-polyethylene glycol block copolymer exhibit good flexibility and water solubility, while the polycaprolactone segments possess certain crystallinity and thermoplasticity. Under certain conditions, the polycaprolactone-polyethylene glycol block copolymer and the polyvinyl alcohol molecular chains become entangled. When the material is damaged, the polycaprolactone segments can rearrange and diffuse in response to external stimuli such as temperature and humidity, filling the damaged areas and achieving self-repair. Sodium borohydride and triethylamine may play a role in regulating the reaction rate and promoting chemical bond formation.

[0019] Furthermore, the modified cellulose is specifically prepared in the following steps:

[0020] B1. Add microcrystalline cellulose to a mixed solution G containing 10% NaOH and 5% urea, freeze at -12°C for 1 hour, remove and immediately stir at high speed until dissolved to form a transparent and uniform cellulose solution; add anatase-type nano-titanium dioxide and 2,2,6,6-tetramethylpiperidinyl oxide to the solution, while introducing oxygen, and react at 30°C for 5 hours; slowly pour the reaction solution into 5% by mass dilute hydrochloric acid to precipitate, collect the solid product by filtration, wash, and dry to obtain intermediate product I;

[0021] B2. Add intermediate product I to deionized water and ultrasonically disperse for 20 minutes to form a uniform suspension; add ammonium polyphosphate and dioctyl phthalate, and simultaneously dropwise add silane coupling agent KH-550, and stir the reaction at 100°C for 4 hours. Simultaneously, slowly add 0.1 mol / L NaOH solution through a constant pressure dropping funnel, and monitor the pH value of the system every 30 minutes to maintain the pH value of the solution at 8; after the reaction, pour the suspension into a polytetrafluoroethylene mold and dry it to obtain intermediate product II;

[0022] B3. Cut the intermediate product II into small pieces, immerse them in a 3% by mass aqueous solution of tannic acid, and shake them at room temperature for 2 hours. Add nano zinc oxide and hexadecyltrimethylammonium bromide to the solution, add 0.1 mol / L ammonia aqueous solution dropwise to adjust the pH to 8, and react at 60°C for 3 hours while continuously introducing nitrogen for protection; then add glyoxal and continue the reaction for 1 hour. After the reaction is completed, remove the product, wash it, and dry it to obtain modified cellulose.

[0023] Furthermore, in step B1, the amount ratio of microcrystalline cellulose, mixed solution G, anatase nano-titanium dioxide and 2,2,6,6-tetramethylpiperidinyl oxide, and dilute hydrochloric acid is 12g:200mL:4g:3g:200mL; the stirring speed is 500r / min; the oxygen flow rate is 100mL / min; the product is washed with deionized water until neutral and dried at 60°C for 24h; in step B2, the amount ratio of deionized water, ammonium polyphosphate, dioctyl phthalate, and silane coupling agent KH-550 is 150mL:6g:2g:2mL; the stirring speed is 200r / min; the product is dried at 60°C for 12h and then dried at 80°C for 12h.

[0024] Furthermore, in step B3, the usage ratio of tannic acid aqueous solution, nano zinc oxide, cetyltrimethylammonium bromide, and glyoxal is 100 mL: 1.5 g: 0.5 g: 0.3 g; the product is washed three times with deionized water and dried at 50° C. for 48 h.

[0025] In step B1, microcrystalline cellulose is chilled at -12°C for 1 hour in a mixed solution G containing 10% NaOH and 5% urea, then dissolved with high-speed stirring. This process utilizes the low temperature and alkaline environment to disrupt the hydrogen bonds between cellulose molecules, causing the cellulose to dissolve. Anatase-type nano-titanium dioxide and 2,2,6,6-tetramethylpiperidinyl oxide are added, and oxygen is introduced. The reaction is carried out at 30°C for 5 hours. In the presence of oxygen, 2,2,6,6-tetramethylpiperidinyl oxide oxidizes the hydroxyl groups on the cellulose molecular chain to aldehyde or ketone groups, changing the chemical structure of the cellulose and increasing its reactivity. Anatase-type nano-titanium dioxide may catalyze oxidation and enhance the material's photostability.

[0026] In step B2, ammonium polyphosphate is a flame retardant that decomposes at high temperatures to produce phosphoric acid, metaphosphoric acid, and other substances. These substances form a dense carbonized layer on the material surface, preventing the transfer of heat and oxygen and improving the material's flame retardancy. Dioctyl phthalate, a plasticizer, increases the material's flexibility. The silane portion of the silane coupling agent KH-550 reacts with the hydroxyl groups on cellulose molecules, while the organic functional groups interact with other ingredients such as ammonium polyphosphate, forming a cross-linked structure between the cellulose and other additives, enhancing the overall performance of the material.

[0027] In step B3, tannic acid contains numerous phenolic hydroxyl groups, which react with nano-zinc oxide to form a protective film on the surface of the material with antioxidant and antibacterial properties, enhancing the material's corrosion resistance. Cetyltrimethylammonium bromide, a surfactant, facilitates the uniform dispersion of tannic acid and nano-zinc oxide on the surface. Glyoxal cross-links with tannic acid and hydroxyl groups on cellulose molecules, further enhancing the material's stability and corrosion resistance.

[0028] A method for preparing an insulating material with corrosion resistance, comprising the following steps:

[0029] S1. Pour dimethyl sulfoxide into a planetary mixer, stir and heat to 50°C, then add vinyl trimethoxysilane and continue stirring for 10 minutes to form a uniform liquid mixing system; then add bisphenol A epoxy resin, polyether ether ketone, and polysiloxane elastomer in sequence, increase the mixer speed and continue stirring for 15 minutes; add poly(p-phenylene benzobisoxazole) to polyphosphoric acid, stir and dissolve at 120°C, cool to 50°C after complete dissolution, and then slowly add it to the mixer and continue stirring for 20 minutes; then add nano-aluminum nitride, nano-zirconium oxide, boron fiber, and molybdenum disulfide to the mixer in sequence, adjust the speed and stir for 20 minutes; finally, add melamine cyanurate, magnesium aluminum hydroxide, Chimassorb 944, fluorinated acrylate copolymer, as well as modified polyvinyl alcohol and modified cellulose to the mixer, maintain 50°C and 150r / min speed, and continue mixing for 45 minutes to ensure that all raw materials are evenly mixed;

[0030] S2. The premixed material is transferred to a twin-screw extruder, and the extruder temperature and screw speed are set. The material is melted, mixed and plasticized under the push of the screw, extruded through a die, and then water-cooled and drawn into strands, which are then pelletized to obtain insulating material particles;

[0031] S3. The insulating material particles are molded by an injection molding machine, and the injection temperature, pressure, holding pressure, holding time and cooling time are set to finally obtain an insulating material product with corrosion resistance.

[0032] Furthermore, in the S1 step, the initial stirring speed is 80r / min, the speed is increased for the first time to 120r / min, and the speed is increased again to 150r / min; polyparaphenylene benzobisoxazole and polyphosphoric acid are mixed in a mass ratio of 1:5; in the S2 step, the temperature of zone 1 of the extruder is set to 160-170°C, the temperature of zone 2 is 170-180°C, the temperature of zone 3 is 180-190°C, the temperature of zone 4 is 190-200°C, the temperature of zone 5 is 200-210°C, and the screw speed is 150-250r / min; in the S3 step, the injection temperature is set to 210-220°C, the injection pressure is 100-110MPa, the holding pressure is 60-70MPa, the holding time is 12-18s, and the cooling time is 12-18s, and finally an insulating material product with corrosion resistance is obtained.

[0033] The present invention provides an insulating material with corrosion resistance and a production process thereof, which has the following beneficial effects:

[0034] 1. Excellent Overall Performance: Through the careful selection and scientific proportioning of various raw materials, the insulating material of this invention possesses electrical insulation, high dielectric strength, low dielectric loss, and heat, corrosion, radiation, and oxidation resistance. For example, bisphenol A epoxy resin and polyetheretherketone (PEEK) serve as a matrix, providing an excellent electrical insulation foundation. Nanomaterials such as nano-aluminum nitride and nano-zirconia enhance heat resistance and hardness, enabling stable operation in high-temperature, strong electric field environments, effectively expanding the material's applicability.

[0035] 2. Excellent balance of mechanical properties: The addition of raw materials such as boron fiber and molybdenum disulfide, along with the modification of polyvinyl alcohol and cellulose, gives the material both high hardness and good flexibility. Boron fiber enhances the overall strength of the material, while molybdenum disulfide acts as a lubricant, improving its flexibility. While ensuring a stable structure, the material can adapt to varying mechanical stresses, avoiding fracture due to excessive brittleness and improving its practicality.

[0036] 3. Excellent corrosion resistance and self-healing ability: Special ingredients in modified polyvinyl alcohol and modified cellulose impart excellent corrosion resistance and self-healing properties to the material. The hydrophobic groups introduced into the modified polyvinyl alcohol enhance water and corrosion resistance, while the polycaprolactone-polyethylene glycol block copolymer imparts self-healing capabilities. The tannic acid in the modified cellulose synergistically interacts with nano-zinc oxide to form a corrosion-resistant protective layer, extending the material's service life in harsh chemical environments and reducing maintenance costs.

[0037] 4. Excellent flame retardancy and environmental adaptability: The addition of flame retardants such as melamine cyanurate and magnesium aluminum hydroxide imparts excellent flame retardancy to the material, effectively improving its safety. Fluorinated acrylate copolymer and Chimassorb 944 enhance the material's weather resistance and oxidation resistance, enabling it to function stably outdoors in high-radiation environments. DETAILED DESCRIPTION

[0038] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0039] Example 1: Preparation of an insulating material with corrosion resistance. The specific preparation steps are as follows:

[0040] S1. Pour 20 parts of dimethyl sulfoxide into a planetary mixer, start stirring and heat to 50°C, adjust the speed to 80r / min, then add 2 parts of vinyl trimethoxy silane, continue stirring for 10 minutes to form a uniform liquid mixing system; then add 60 parts of bisphenol A epoxy resin, 20 parts of polyether ether ketone, and 5 parts of polysiloxane elastomer in sequence, increase the mixer speed to 120r / min, and continue stirring for 15 minutes; add 3 parts of polyparaphenylene benzobisoxazole to 15 parts of polyphosphoric acid, stir and dissolve at 120°C, cool to 50°C after complete dissolution, and then slowly add it to the mixer and continue stirring for 20 minutes; then add 10 parts of nano-aluminum nitride, 3 parts of nano-zirconium oxide, 5 parts of boron fiber, and 4 parts of molybdenum disulfide to the mixer in sequence, adjust the speed to 150r / min, and stir for 20 minutes; finally, add 8 parts of melamine cyanurate, 6 parts of magnesium aluminum hydroxide, and 1 part of Chimassorb 944. Add 7 parts of fluorinated acrylate copolymer, 10 parts of modified polyvinyl alcohol, and 8 parts of modified cellulose into a mixer. Maintain the temperature at 50°C and the speed at 150 r / min and continue mixing for 45 minutes to ensure that all the raw materials are evenly mixed.

[0041] S2. The premixed material is transferred to a twin-screw extruder, and the temperature of the extruder zone 1, the temperature of the zone 2, the temperature of the zone 3, the temperature of the zone 4, the temperature of the zone 5, and the temperature of the zone 5 are set to 160°C, 170°C, 180°C, 190°C, and 200°C, respectively. The screw speed is 150 r / min. The material is melted, mixed, and plasticized under the push of the screw, extruded through a die, and then water-cooled and pelletized to obtain insulating material particles.

[0042] S3. The insulating material particles are molded by an injection molding machine, and the injection temperature, injection pressure, holding pressure, and cooling time are set to 210° C., 100 MPa, 60 MPa, 12 s, and 12 s, to finally obtain an insulating material product with corrosion resistance.

[0043] Example 2: Preparation of an insulating material with corrosion resistance. The specific preparation steps are as follows:

[0044] S1. Pour 30 parts of dimethyl sulfoxide into a planetary mixer, start stirring and heat to 50°C, adjust the speed to 80r / min, then add 5 parts of vinyl trimethoxysilane, continue stirring for 10 minutes to form a uniform liquid mixing system; then add 80 parts of bisphenol A epoxy resin, 30 parts of polyether ether ketone, and 10 parts of polysiloxane elastomer in sequence, increase the mixer speed to 120r / min, and continue stirring for 15 minutes; add 6 parts of poly(p-phenylene benzobisoxazole) to 30 parts of polyphosphoric acid, stir and dissolve at 120°C, cool to 50°C after complete dissolution, and then slowly add Add the mixture to the mixer and continue stirring for 20 minutes; then add 15 parts of nano-aluminum nitride, 7 parts of nano-zirconium oxide, 10 parts of boron fiber, and 8 parts of molybdenum disulfide to the mixer in sequence, adjust the speed to 150 r / min, and stir for 20 minutes; finally, add 12 parts of melamine cyanurate, 10 parts of magnesium aluminum hydroxide, 3 parts of Chimassorb 944, 12 parts of fluorinated acrylate copolymer, 20 parts of modified polyvinyl alcohol, and 15 parts of modified cellulose to the mixer, maintain the temperature at 50°C and the speed at 150 r / min, and continue mixing for 45 minutes to ensure that all the raw materials are evenly mixed;

[0045] S2. The premixed material is transferred to a twin-screw extruder, and the temperature of the extruder zone 1 is set to 170°C, the temperature of the zone 2 is 180°C, the temperature of the zone 3 is 190°C, the temperature of the zone 4 is 200°C, and the temperature of the zone 5 is 210°C. The screw speed is 250r / min. The material is melted, mixed and plasticized under the push of the screw, extruded through a die, and then water-cooled and pelletized to obtain insulating material particles;

[0046] S3. The insulating material particles are molded by an injection molding machine, with the injection temperature set at 220° C., the injection pressure at 110 MPa, the holding pressure at 70 MPa, the holding time at 18 s, and the cooling time at 18 s, to finally obtain an insulating material product with corrosion resistance.

[0047] Example 3: Preparation of an insulating material with corrosion resistance. The specific preparation steps are as follows:

[0048] S1. Pour 25 parts of dimethyl sulfoxide into a planetary mixer, start stirring and heat to 50°C, adjust the speed to 80r / min, then add 3 parts of vinyl trimethoxysilane, continue stirring for 10 minutes to form a uniform liquid mixing system; then add 70 parts of bisphenol A epoxy resin, 25 parts of polyether ether ketone, and 7 parts of polysiloxane elastomer in sequence, increase the mixer speed to 120r / min, and continue stirring for 15 minutes; add 4 parts of poly(p-phenylene benzobisoxazole) to 20 parts of polyphosphoric acid, stir and dissolve at 120°C, cool to 50°C after complete dissolution, and then slowly add Add to the mixer and continue stirring for 20 minutes; then add 12 parts of nano-aluminum nitride, 5 parts of nano-zirconium oxide, 7 parts of boron fiber, and 6 parts of molybdenum disulfide to the mixer in sequence, adjust the speed to 150r / min, and stir for 20 minutes; finally, add 10 parts of melamine cyanurate, 8 parts of magnesium aluminum hydroxide, 2 parts of Chimassorb944, 10 parts of fluorinated acrylate copolymer, and 15 parts of modified polyvinyl alcohol and 11 parts of modified cellulose to the mixer, maintain the temperature at 50°C and the speed at 150r / min, and continue mixing for 45 minutes to ensure that all the raw materials are evenly mixed;

[0049] S2. The premixed material is transferred to a twin-screw extruder, and the temperature of the extruder zone 1, the temperature of the zone 2, the temperature of the zone 3, the temperature of the zone 4, the temperature of the zone 5, and the screw speed are set to 165°C, 175°C, 185°C, 195°C, and 205°C, respectively. The material is melted, mixed, and plasticized under the push of the screw, extruded through a die, and then water-cooled and pelletized to obtain insulating material particles.

[0050] S3. The insulating material particles are molded by an injection molding machine, and the injection temperature, injection pressure, holding pressure, holding time, and cooling time are set to 215° C., 105 MPa, 65 MPa, 15 s, and 15 s, to finally obtain an insulating material product with corrosion resistance.

[0051] Example 4, preparation of modified polyvinyl alcohol, the specific preparation steps are as follows:

[0052] A1. Add 15 g of polyvinyl alcohol to 200 mL of deionized water and stir at 85 ° C at a stirring speed of 300 r / min until completely dissolved. After stirring, cool to 50 ° C, add 0.1 mol / L of p-toluenesulfonic acid aqueous solution, adjust the pH to 4, and then slowly add a mixed solution of 3 g of methyltrimethoxysilane and 2 g of n-octyltriethoxysilane diluted with 10 mL of anhydrous ethanol dropwise at a rate of 2 mL / min. After the addition is complete, the system is heated to 65 ° C and stirred at a speed of 300 r / min for 4 hours. After the reaction is completed, triethylamine is added to neutralize the catalyst, the pH is adjusted to 7, and the solution is poured into 500 mL of acetone for precipitation. The solid product is collected by filtration, washed three times with deionized water, and dried at 60 ° C for 12 hours to obtain intermediate product 1;

[0053] A2. The intermediate product 1 was added to 150 mL of N,N-dimethylformamide and ultrasonically dispersed for 30 min to form a uniform dispersion; 5 g of nano-silicon carbide, 1 g of graphene quantum dots and 0.2 g of sodium dodecylbenzenesulfonate were added to the dispersion in sequence, and under nitrogen protection, the temperature was raised to 70 ° C. and the reaction was stirred at a speed of 200 r / min for 3 h. During this period, the nitrogen flow rate was maintained at 50 mL / min; after the reaction, 0.5 g of dibenzoyl peroxide was added and the stirring reaction was continued for 1 h. After the reaction, the product was poured into deionized water for precipitation, filtered, washed with ethanol 3 times, and dried at 80 ° C for 24 h to obtain intermediate product 2;

[0054] A3. Add the intermediate product 2 to 100 mL of tetrahydrofuran, heat to 60° C. and stir to dissolve, then add 4 g of polycaprolactone-polyethylene glycol block copolymer, 2 g of sodium borohydride and 2 mL of triethylamine, and stir to react at 80° C. for 3 h. After the reaction is completed, slowly add glacial acetic acid dropwise to terminate the reaction and adjust the pH to 6; pour the solution into a large amount of deionized water for precipitation, then centrifuge at 8000 r / min for 10 min each time, and pour out the supernatant. After the product is completely centrifuged, wash the precipitate three times with deionized water and dry at 50° C. for 48 h to obtain modified polyvinyl alcohol.

[0055] Example 5, preparation of modified cellulose, the specific preparation steps are as follows:

[0056] B1. Add 12 g of microcrystalline cellulose to 200 mL of a mixed solution containing 10% NaOH and 5% urea, freeze at -12°C for 1 hour, and immediately stir at 500 rpm until dissolved to form a transparent and uniform cellulose solution. Add 4 g of anatase-type nano-titanium dioxide and 3 g of 2,2,6,6-tetramethylpiperidinyl oxide to the solution, and introduce oxygen at a flow rate of 100 mL / min. The reaction is carried out at 30°C for 5 hours. Slowly pour the reaction solution into 200 mL of 5% dilute hydrochloric acid for precipitation. Collect the solid product by filtration, wash with deionized water until neutral, and dry at 60°C for 24 hours to obtain intermediate product I.

[0057] B2. Add the intermediate product I to 150 mL of deionized water and ultrasonically disperse for 20 min to form a uniform suspension; add 6 g of ammonium polyphosphate and 2 g of dioctyl phthalate, and at the same time, dropwise add 2 mL of silane coupling agent KH-550, and stir at 100 ° C at a speed of 200 r / min for 4 h. At the same time, slowly add 0.1 mol / L NaOH solution through a constant pressure dropping funnel, and check the pH value of the system every 30 min during the reaction to maintain the pH of the solution at 8; after the reaction, pour the suspension into a polytetrafluoroethylene mold, dry it with air at 60 ° C for 12 h, and then dry it at 80 ° C for 12 h to obtain intermediate product II;

[0058] B3. Cut the intermediate product II into small pieces, immerse them in 100 mL of a 3% mass fraction tannic acid aqueous solution, and shake them at room temperature for 2 h. Add 1.5 g of nano-zinc oxide and 0.5 g of hexadecyltrimethylammonium bromide to the solution, add 0.1 mol / L ammonia aqueous solution dropwise to adjust the pH to 8, and react at 60°C for 3 h while continuously introducing nitrogen for protection; then add 0.3 g of glyoxal and continue the reaction for 1 h. After the reaction, remove the product, wash it three times with deionized water, and dry it at 50°C for 48 h to obtain modified cellulose.

[0059] Comparative Example 1: Preparation of an insulating material product with corrosion resistance. The specific preparation steps are as follows:

[0060] The remaining steps remain unchanged, except that the modified polyvinyl alcohol in Example 2 is replaced by polyvinyl alcohol without any treatment to prepare an insulating material product with corrosion resistance.

[0061] Comparative Example 2: Preparation of an insulating material product with corrosion resistance. The specific preparation steps are as follows:

[0062] The remaining steps remained unchanged, except that the modified cellulose in Example 2 was replaced by cellulose without any treatment, to prepare an insulating material product with corrosion resistance.

[0063] Performance Testing

[0064]

[0065]

[0066]

[0067] After conducting performance tests on the patented insulating material and comparing Examples 1-3 with Comparative Examples 1-2, it was found that the various performance characteristics of the Examples were more outstanding. In terms of corrosion resistance, after immersing the Examples in acid, alkali, and salt solutions for 1000 hours, there were no obvious signs of corrosion on the surface, and the electrical insulation performance decreased very little; while the Comparative Example showed slight corrosion after immersion for 500 hours, and the electrical insulation performance decreased significantly. In terms of electrical insulation performance, the volume resistivity and surface resistivity of the Examples were higher, and the dielectric strength was also significantly higher than that of the Comparative Example. In the heat resistance test, the Examples maintained their performance at 180°C for much longer than the Comparative Example. In terms of mechanical properties, the Examples achieved a good balance between hardness and flexibility, with a higher Rockwell hardness and no cracks when bent 180°; the Comparative Example had a lower hardness and cracks appeared at smaller bending angles. In terms of self-healing performance, under certain conditions, scratches on the Examples could be significantly shallowed, and the electrical insulation performance was significantly restored, while the Comparative Example had no self-healing ability. In the flame retardant performance test, the Examples reached V-0 level, while the Comparative Example was only V-1 level.

[0068] This fully demonstrates that the scientific ratio of raw materials and the modification of polyvinyl alcohol and cellulose have a significant effect on improving the performance of insulating materials, enabling the insulating material to be used stably in a variety of complex environments and having a wider range of application value.

[0069] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. An insulating material with corrosion resistance, characterized by: The invention comprises the following raw materials in parts by weight: 60-80 parts of bisphenol A epoxy resin, 20-30 parts of polyetheretherketone, 10-15 parts of nano-aluminum nitride, 5-10 parts of boron fiber, 4-8 parts of molybdenum disulfide, 3-6 parts of poly(p-phenylene benzobisoxazole), 2-5 parts of vinyltrimethoxysilane, 20-30 parts of dimethyl sulfoxide, 8-12 parts of melamine cyanurate, 6-10 parts of magnesium aluminum hydroxide, 1-3 parts of Chimassorb 944, 10-20 parts of modified polyvinyl alcohol, 8-15 parts of modified cellulose, 3-7 parts of nano-zirconium oxide, 5-10 parts of polysiloxane elastomer, and 7-12 parts of fluorine-containing acrylate copolymer.

2. The corrosion-resistant insulating material according to claim 1, characterized in that: The modified polyvinyl alcohol is specifically prepared in the following steps: A1. Add polyvinyl alcohol to deionized water and stir at 85°C until completely dissolved. After stirring, cool to 50°C, add aqueous p-toluenesulfonic acid solution to adjust the pH to 4, and then slowly add dropwise a mixed solution D of methyltrimethoxysilane and n-octyltriethoxysilane diluted with anhydrous ethanol. After the addition is complete, heat the system to 65°C and continue stirring for 4 hours. After the reaction is complete, add triethylamine to adjust the pH to 7. Pour the solution into acetone for precipitation. Collect the solid product by filtration, wash, and dry to obtain intermediate product 1. A2. Add intermediate product 1 to N,N-dimethylformamide and ultrasonically disperse for 30 minutes to form a uniform dispersion; add nano-silicon carbide, graphene quantum dots and sodium dodecylbenzenesulfonate to the dispersion in sequence, raise the temperature to 70°C under nitrogen protection, stir and react for 3 hours, then add dibenzoyl peroxide and continue stirring and reacting for 1 hour; after the reaction, pour the product into deionized water for precipitation, filter, wash and dry to obtain intermediate product 2; A3. Add intermediate product 2 to tetrahydrofuran, heat to 60°C and stir to dissolve, then add polycaprolactone-polyethylene glycol block copolymer, sodium borohydride and triethylamine, and stir at 80°C for 3 hours. After the reaction is completed, slowly add glacial acetic acid dropwise to terminate the reaction and adjust the pH to 6; The solution is poured into a large amount of deionized water for precipitation, and then centrifuged and separated, and the supernatant is poured out. After the product is completely centrifuged, the precipitate is washed and dried to obtain modified polyvinyl alcohol.

3. The corrosion-resistant insulating material according to claim 2, characterized in that: In step A1, the amount ratio of polyvinyl alcohol, deionized water, mixed solution D, and acetone is 15 g:200 mL:10 mL:500 mL; the mixed solution D is a mixed solution of 3 g of methyltrimethoxysilane and 2 g of n-octyltriethoxysilane diluted with 10 mL of anhydrous ethanol; the concentration of the aqueous p-toluenesulfonic acid solution is 0.1 mol / L; the dropping speed is controlled at 2 mL / min; the stirring speed is 300 r / min; the product is washed three times with deionized water and dried at 60°C for 12 h.

4. The corrosion-resistant insulating material according to claim 2, characterized in that: In step A2, the usage ratio of N,N-dimethylformamide, nano-silicon carbide, graphene quantum dots, sodium dodecylbenzenesulfonate, and dibenzoyl peroxide is 150 mL: 5 g: 1 g: 0.2 g: 0.5 g; the stirring speed is 200 r / min; the nitrogen flow rate is maintained at 50 mL / min; after filtration, the mixture is washed with ethanol three times and dried at 80° C. for 24 h.

5. The corrosion-resistant insulating material according to claim 2, characterized in that: In step A3, the ratio of tetrahydrofuran, polycaprolactone-polyethylene glycol block copolymer, sodium borohydride and triethylamine is 100 mL:4 g:2 g:2 mL; centrifugation is performed at 8000 r / min for 10 minutes each time; the precipitate is washed three times with deionized water and dried at 50° C. for 48 hours.

6. The corrosion-resistant insulating material according to claim 1, characterized in that: The modified cellulose is specifically prepared in the following steps: B1. Add microcrystalline cellulose to a mixed solution G containing 10% NaOH and 5% urea, freeze at -12°C for 1 hour, remove and immediately stir at high speed until dissolved to form a transparent and uniform cellulose solution; add anatase-type nano-titanium dioxide and 2,2,6,6-tetramethylpiperidinyl oxide to the solution, while introducing oxygen, and react at 30°C for 5 hours; slowly pour the reaction solution into 5% by mass dilute hydrochloric acid to precipitate, collect the solid product by filtration, wash, and dry to obtain intermediate product I; B2. Add intermediate product I to deionized water and ultrasonically disperse for 20 minutes to form a uniform suspension; Ammonium polyphosphate and dioctyl phthalate were added, and a silane coupling agent KH-550 was added dropwise. The mixture was stirred at 100°C for 4 hours, and a 0.1 mol / L NaOH solution was slowly added dropwise through a constant pressure dropping funnel. The pH value of the system was checked every 30 minutes to maintain the solution pH at 8. After the reaction, the suspension was poured into a polytetrafluoroethylene mold and dried to obtain intermediate product II. B3. Cut the intermediate product II into small pieces, immerse them in a 3% by mass aqueous solution of tannic acid, and shake them at room temperature for 2 hours. Add nano zinc oxide and hexadecyltrimethylammonium bromide to the solution, add 0.1 mol / L ammonia aqueous solution dropwise to adjust the pH to 8, and react at 60°C for 3 hours while continuously introducing nitrogen for protection; then add glyoxal and continue the reaction for 1 hour. After the reaction is completed, remove the product, wash it, and dry it to obtain modified cellulose.

7. The corrosion-resistant insulating material according to claim 6, characterized in that: In step B1, the amount ratio of microcrystalline cellulose, mixed solution G, anatase nano-titanium dioxide and 2,2,6,6-tetramethylpiperidinium oxide, and dilute hydrochloric acid is 12g:200mL:4g:3g:200mL; the stirring speed is 500r / min; the oxygen flow rate is 100mL / min; the product is washed with deionized water until neutral and dried at 60°C for 24h; in step B2, the amount ratio of deionized water, ammonium polyphosphate, dioctyl phthalate, and silane coupling agent KH-550 is 150mL:6g:2g:2mL; the stirring speed is 200r / min; the product is dried at 60°C for 12h and then at 80°C for 12h.

8. The corrosion-resistant insulating material according to claim 6, characterized in that: In step B3, the ratio of tannic acid aqueous solution, nano zinc oxide, cetyltrimethylammonium bromide, and glyoxal is 100 mL: 1.5 g: 0.5 g: 0.3 g; the product is washed three times with deionized water and dried at 50° C. for 48 h.

9. A method for preparing an insulating material having corrosion resistance, characterized in that: The specific steps include: S1. Pour dimethyl sulfoxide into a planetary mixer, stir and heat to 50°C, then add vinyl trimethoxysilane and continue stirring for 10 minutes to form a uniform liquid mixing system; then add bisphenol A epoxy resin, polyether ether ketone, and polysiloxane elastomer in sequence, increase the mixer speed and continue stirring for 15 minutes; add poly(p-phenylene benzobisoxazole) to polyphosphoric acid, stir and dissolve at 120°C, cool to 50°C after complete dissolution, and then slowly add it to the mixer and continue stirring for 20 minutes; then add nano-aluminum nitride, nano-zirconium oxide, boron fiber, and molybdenum disulfide to the mixer in sequence, adjust the speed and stir for 20 minutes; finally, add melamine cyanurate, magnesium aluminum hydroxide, Chimassorb 944, fluorinated acrylate copolymer, as well as modified polyvinyl alcohol and modified cellulose to the mixer, maintain 50°C and 150r / min speed, and continue mixing for 45 minutes to ensure that all raw materials are evenly mixed; S2. The premixed material is transferred to a twin-screw extruder, and the extruder temperature and screw speed are set. The material is melted, mixed and plasticized under the push of the screw, extruded through a die, and then water-cooled and drawn into strands, which are then pelletized to obtain insulating material particles; S3. The insulating material particles are molded by an injection molding machine, and the injection temperature, pressure, holding pressure, holding time and cooling time are set to finally obtain an insulating material product with corrosion resistance.

10. The method for preparing a corrosion-resistant insulating material according to claim 9, characterized in that: In the step S1, the initial stirring speed is 80 r / min, the speed is increased for the first time to 120 r / min, and the speed is increased again to 150 r / min; poly(p-phenylene benzobisoxazole) and polyphosphoric acid are mixed in a mass ratio of 1:5; in the step S2, the temperature of the extruder zone 1 is set to 160-170°C, the temperature of the zone 2 is set to 170-180°C, the temperature of the zone 3 is set to 180-190°C, the temperature of the zone 4 is set to 190-200°C, the temperature of the zone 5 is set to 200-210°C, and the screw speed is set to 150-250 r / min; in the step S3, the injection temperature is set to 210-220°C, the injection pressure is set to 100-110 MPa, the holding pressure is set to 60-70 MPa, the holding time is set to 12-18s, and the cooling time is set to 12-18s, thereby finally obtaining an insulating material product with corrosion resistance.

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