Water and electric shock resistant PVC insulating electrical tape and its preparation method

Abstract

The application discloses a kind of water-resistant and electric breakdown-resistant PVC insulating electrician adhesive tape and preparation method thereof, and relates to the technical field of insulating electrician adhesive tape.The water-resistant and electric breakdown-resistant PVC insulating electrician adhesive tape includes PVC film layer and adhesive layer arranged on one surface thereof;The adhesive layer includes primer layer directly contacting the PVC film layer and pressure-sensitive adhesive layer arranged on the other surface of the primer layer.The PVC film layer includes the following raw material components: 50 parts of PVC resin, 10-15 parts of insulating filler, 15-20 parts of toughening agent, 2-4 parts of heat stabilizer, 0.25-0.75 parts of lubricant and 0.5-1.5 parts of antioxidant by weight fraction;The primer layer includes the following raw material components: 50 parts of acrylate monomer, 6-8 parts of unsaturated acid, 2-3 parts of photoinitiator and 0.5-1 part of antioxidant by weight fraction.

Description

Technical Field

[0001] This invention relates to the field of insulating electrical tape technology, specifically a water-resistant and electrical breakdown-resistant PVC insulating electrical tape and its preparation method. Background Technology

[0002] Polyvinyl chloride (PVC) insulating electrical tape is widely used in wire and cable joint insulation, electrical equipment protection, and marking due to its excellent insulation properties, flexibility, self-adhesion, and cost advantages. It is an indispensable basic material in power construction, electronic manufacturing, and maintenance. However, as power equipment develops towards high voltage, miniaturization, outdoor use, and extreme environment applications, traditional PVC electrical tape has revealed significant shortcomings in long-term reliability and adaptability to special environments.

[0003] First, traditional PVC tapes generally have poor water resistance. Their base material and adhesives often contain hydrophilic components or have microscopic defects. In humid environments or under immersion conditions, moisture easily penetrates into the tape, leading to a significant decrease in volume resistivity, deterioration of insulation performance, and even safety hazards such as leakage and short circuits. This problem is particularly prominent during the rainy season, in underground projects, or in coastal areas with high humidity.

[0004] Secondly, insufficient electrical breakdown strength is another key bottleneck. The filler in traditional PVC tape formulations is unevenly dispersed, resulting in limited dielectric strength and resistance to tracking under high voltage, making the tape prone to breakdown failure under overvoltage or corona discharge.

[0005] Furthermore, existing tapes lack comprehensive protection capabilities in complex environments. When used outdoors, PVC tapes need to resist UV aging, temperature cycling, and chemical corrosion simultaneously. However, traditional formulations do not adequately address these issues, leading to problems such as hardening, cracking, and loss of adhesion, which further weakens their insulating barrier function.

[0006] In summary, the development of a water-resistant and electrical breakdown-resistant PVC insulating electrical tape is of great significance in addressing the aforementioned issues. Summary of the Invention

[0007] The purpose of this invention is to provide a water-resistant and electrical breakdown-resistant PVC insulating electrical tape and its preparation method, so as to solve the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0009] A water-resistant and electrical breakdown-resistant PVC insulating electrical tape includes a PVC film layer and an adhesive layer disposed on one surface thereon;

[0010] The adhesive layer includes a base layer that directly contacts the PVC film layer and a pressure-sensitive adhesive layer disposed on the other surface of the base layer.

[0011] Furthermore, the thickness of the PVC film layer is 0.12~0.2mm; the thickness of the base coating layer is 0.1~2μm; and the thickness of the pressure-sensitive adhesive layer is 5~20μm.

[0012] Further, the PVC film layer comprises the following raw material components: by weight, 50 parts of PVC resin, 10-15 parts of insulating filler, 15-20 parts of toughening agent, 2-4 parts of heat stabilizer, 0.25-0.75 parts of lubricant, and 0.5-1.5 parts of antioxidant.

[0013] Furthermore, the method for preparing the insulating filler is as follows:

[0014] (1) Add boron nitride nanoparticles to a 30wt% hydrogen peroxide aqueous solution and ultrasonically disperse at 80~100℃ for 0.5~1h. After filtration, washing and drying, hydroxylated boron nitride nanoparticles are obtained.

[0015] (2) Hydroxylated boron nitride nanoparticles and kaolin micron particles are mixed evenly at a certain mass ratio to obtain a mixed filler;

[0016] (3) Add the mixed filler, epoxidized soybean oil and zinc acetylacetonate to toluene, stir and heat to 95~105℃, stir and react for 4~12h, stop the reaction, filter, wash and dry to obtain the insulating filler.

[0017] Furthermore, the mass ratio of the boron nitride nanoparticles to the hydrogen peroxide aqueous solution is 1g:25mL.

[0018] Furthermore, the mass ratio of the hydroxylated boron nitride nanoparticles to the kaolin microparticles is (1~2):(3~4).

[0019] Furthermore, the average particle size of the boron nitride nanoparticles is ≤100nm; the average particle size of the kaolin microparticles is 0.1~3μm.

[0020] Furthermore, the mass ratio of the mixed filler, epoxidized soybean oil, zinc acetylacetonate, and toluene is 1:(0.2~0.4):(0.02~0.03):10.

[0021] Furthermore, the toughening agent includes dinonyl phthalate and tricresol phosphate.

[0022] Furthermore, the toughening agent also includes modified epoxidized soybean oil.

[0023] Furthermore, the dinonyl phthalate, tricresyl phosphate, and modified epoxidized soybean oil are mixed and compounded in a mass ratio of 1:1:(2~3).

[0024] Furthermore, the preparation method of the modified epoxidized soybean oil is as follows:

[0025] (1) Under nitrogen protection, 1,4-bis(2',3'-epoxypropyl)perfluorobutane, 2-furan methanethiol and triethylamine were added to toluene, stirred and heated to 95~105℃, stirred for 6~48h, the reaction was stopped, and the mixture was allowed to cool naturally to room temperature. Furan-terminated perfluorobutane was obtained by vacuum distillation.

[0026] (2) Under nitrogen protection, furan-terminated perfluorobutane and maleic anhydride were added to the reaction vessel, stirred and heated to 55-65°C, stirred for 6-24 hours, and the reaction was stopped. After the reaction was allowed to cool naturally to room temperature, it was filtered, washed with deionized water and dried to obtain carboxyl-terminated perfluorobutane.

[0027] (3) Under nitrogen protection, carboxyl-terminated perfluorobutane, epoxidized soybean oil and zinc acetylacetonate were added to toluene, stirred and heated to 95~105℃, stirred and reacted for 4~12h, the reaction was stopped, and the mixture was allowed to cool naturally to room temperature. Modified epoxidized soybean oil was obtained by vacuum distillation.

[0028] Further, the mass ratio of 1,4-bis(2',3'-epoxypropyl)perfluorobutane, 2-furan methanethiol, triethylamine, and toluene is 1:(0.72~0.76):(0.05~0.06):10.

[0029] Furthermore, the mass ratio of the furan-terminated perfluorobutane to maleic anhydride is 1:(0.39~0.42).

[0030] Furthermore, the mass ratio of the carboxyl-terminated perfluorobutane, epoxidized soybean oil, zinc acetylacetonate, and toluene is 1:(2.85~2.9):(0.05~0.06):10.

[0031] Furthermore, the heat stabilizer is a calcium-zinc composite heat stabilizer.

[0032] Furthermore, the lubricant is any one of paraffin wax or chlorinated paraffin wax.

[0033] Furthermore, the antioxidant is a hindered phenolic antioxidant; through the synergistic effect of calcium-zinc composite heat stabilizer and hindered phenolic antioxidant, polyvinyl chloride is endowed with certain UV resistance properties.

[0034] Furthermore, the base coating comprises the following raw material components: by weight, 50 parts of acrylate monomer, 6-8 parts of unsaturated acid, 2-3 parts of photoinitiator, and 0.5-1 parts of antioxidant.

[0035] Furthermore, the acrylate monomers include, but are not limited to, one or a combination of several of methyl acrylate, ethyl acrylate, butyl acrylate, and isooctyl acrylate.

[0036] Furthermore, the unsaturated acid includes, but is not limited to, one or a combination of several of acrylic acid, methacrylic acid, 2-propylacrylic acid, and 4-pentenoic acid.

[0037] Furthermore, the photoinitiator is photoinitiator 1173.

[0038] Furthermore, the pressure-sensitive adhesive layer comprises the following raw material components: by weight, 50 parts of acrylate monomer, 5-10 parts of EVA resin, 5-10 parts of insulating filler, 2-4 parts of unsaturated isocyanate, 2-3 parts of initiator, 0.5-1 part of antioxidant, and 100 parts of toluene.

[0039] Furthermore, the unsaturated isocyanate includes, but is not limited to, one or a combination of several of vinyl isocyanate, allyl isocyanate, ethyl isocyanate, and isocyanoethyl methacrylate.

[0040] Furthermore, the initiator is benzoyl peroxide.

[0041] Furthermore, the preparation method of the water-resistant and electrical breakdown-resistant PVC insulating electrical tape includes the following steps:

[0042] S1: Add PVC resin, insulating filler, toughening agent, heat stabilizer, lubricant and antioxidant into the extruder according to the formula ratio, stir and mix at a temperature of 150~160℃ and a stirring speed of 200~300r / min for 1~2 hours, and then extrude to obtain PVC film layer.

[0043] S2: Apply the base coat;

[0044] S21: Mix acrylate monomers, unsaturated acids, photoinitiators, and antioxidants evenly according to the formula ratio to obtain the primer slurry;

[0045] S22: Apply the primer slurry to any surface of the PVC film and irradiate it with 365nm wavelength ultraviolet light at a power of 60~80W / cm for 10~15s to form the primer layer.

[0046] S3: Set the pressure-sensitive adhesive layer;

[0047] S31: Acrylic ester monomer, EVA resin, and unsaturated isocyanate are added to toluene to obtain the emulsion to be reacted, and the emulsion is divided into four equal parts; take one part of the emulsion to be reacted, add 30% of the initiator according to the formula, and stir and react at 75~85℃ for 0.5~1h, then stir and dropwise add the remaining emulsion to be reacted and the initiator. After the addition is complete, continue to stir and react for 3~6h; finally, add insulating filler and antioxidant, stir and mix for 0.5~1h to obtain pressure-sensitive adhesive paste;

[0048] S32: Apply the pressure-sensitive adhesive paste to the base layer, dry it at 110~115℃ to form a pressure-sensitive adhesive layer, and finally roll it up to obtain a water-resistant and electrical breakdown-resistant PVC insulating electrical tape.

[0049] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0050] (1) In this invention, the insulating filler is obtained by compounding and modifying nano-sized fillers and micro-sized fillers. The nanoparticles can fill the gaps between micro-sized particles, reducing internal defects in the PVC insulating tape. This not only improves the mechanical properties of the tape but also enhances its electrical insulation properties. In this scheme, boron nitride nanoparticles are oxidized to increase the number of hydroxyl groups on their surface, thereby better reacting with the epoxy groups on epoxidized soybean oil to prepare the insulating filler. This insulating filler is modified with epoxidized soybean oil, so it has good dispersibility in PVC, effectively avoiding the problem of agglomeration of the insulating filler. It has a significant enhancing effect on the mechanical properties, electrical insulation properties, and UV resistance of PVC insulating tape.

[0051] (2) In this invention, the toughening agent is first designed to be a mixture of dinonyl phthalate and tricresyl phosphate. The reason is that dinonyl phthalate and tricresyl phosphate have good compatibility with PVC, and both have little impact on the electrical insulation performance of PVC, thus toughening the PVC to obtain a PVC with better performance. However, considering that traditional toughening agents are prone to migration, resulting in poor durability of PVC products, and may form conductive channels under the action of an electric field, which in turn reduces the electrical insulation performance of the prepared PVC insulating tape. Therefore, in this invention, 1,4-bis(2',3'-epoxypropyl)perfluorobutane and 2-furan methanethiol undergo a click reaction to obtain furan-terminated perfluorobutane; then, it undergoes a DA reaction with maleic anhydride, followed by washing and hydrolysis with deionized water to obtain carboxyl-terminated perfluorobutane; finally, it undergoes an epoxidation reaction with epoxidized soybean oil to obtain modified epoxidized soybean oil. Similarly, the modified epoxidized soybean oil exhibits good compatibility with polyvinyl chloride (PVC). As a toughening agent, its carboxyl groups react with the active chlorine on PVC, forming a covalent cross-linked network. This makes the modified epoxidized soybean oil less prone to migration, thus enhancing the mechanical properties, durability, and electrical insulation of the resulting PVC insulating tape. Furthermore, in the aforementioned preparation of the insulating filler, the ratio of epoxidized soybean oil to mixed fillers is controlled, preserving some of the epoxy groups on the epoxidized soybean oil. Consequently, the insulating filler will subsequently interact with the carboxyl groups on the modified epoxidized soybean oil. This results in a tight cross-linked network within the PVC, further improving the mechanical and electrical insulation properties of the PVC tape. In addition, the presence of perfluorobutane chain ends in the modified epoxidized soybean oil further enhances the water resistance of PVC products, strengthening their resistance to capillary penetration, pressure penetration, and adsorption diffusion. This weakens the migration rate of traditional toughening agents, further ensuring the durability of PVC products. In this invention, by mixing and compounding toughening agents, the toughening agents maintain high-efficiency toughening while ensuring the mechanical properties, durability, electrical insulation, water resistance, and other properties of PVC insulating tape.

[0052] (3) In this invention, a base coating is provided on the PVC film layer of the PVC electrical insulating tape. The base coating mainly serves to increase the adhesion between the pressure-sensitive adhesive layer and the PVC film layer, and to prevent delamination. The base coating is obtained by UV curing of acrylate monomers and unsaturated acid. The role of adding unsaturated acid is to introduce carboxyl groups, which react with active chlorine and epoxy groups to enhance the bonding force between the base coating and the PVC film layer.

[0053] (4) In this invention, EVA resin, insulating filler and unsaturated isocyanate are added to the pressure-sensitive adhesive layer. The role of EVA resin is to improve the viscosity and other properties of the pressure-sensitive adhesive layer. The role of insulating filler is to enhance the electrical insulation performance of the pressure-sensitive adhesive layer and consolidate the anti-electric breakdown performance of PVC insulating tape. The role of unsaturated isocyanate is to play a cross-linking role. On the one hand, it can react with the epoxy groups and other groups on the insulating filler to enhance the adhesion performance of the pressure-sensitive adhesive layer. On the other hand, it can also combine with the carboxyl groups of the base layer to enhance the bonding force between the pressure-sensitive adhesive layer and the base layer.

[0054] In summary, the present invention effectively enhances the mechanical properties, durability, electrical insulation properties, and water resistance of PVC insulating tape through the preparation of insulating fillers and the formulation of toughening agents; at the same time, the setting of the base layer and pressure-sensitive adhesive layer ensures a tight bond between the layers, and the final PVC insulating tape maintains high electrical insulation performance while also having long-lasting durability. Detailed Implementation

[0055] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] It should be noted that the following quantities are by weight, and there are no special restrictions on the suppliers of all raw materials involved in this invention. Exemplary examples include:

[0057] In the following examples, boron nitride nanoparticles with a purity of ≥99.9% and an average particle size of 100nm, with product number BN-100N, were purchased from Yumu (Ningbo) New Materials Co., Ltd.

[0058] Kaolin micron-sized particles, with a purity of AR%, an average particle size of 2μm, product number PA90331, were purchased from Dongguan Sanfeng Chemical Co., Ltd.

[0059] Polyvinyl chloride (PVC), purity ≥99.5%, item number 9002-86-2; epoxidized soybean oil, purity ≥99.5%, CAS number 8013-07-8; zinc acetylacetone, purity ≥99.5%; chlorinated paraffin, purity ≥99%; methyl acrylate, purity ≥99%; ethyl acrylate, purity ≥99%; butyl acrylate, purity ≥99%; isooctyl acrylate, purity ≥99%; methacrylic acid, purity ≥99%; all purchased from Hubei Guangao Biotechnology Co., Ltd.

[0060] Dinonyl phthalate, purity ≥95%; Tricresol phosphate, purity ≥99%; 1,4-Di(2',3'-epoxypropyl)perfluorobutane, purity ≥98%, CAS No. 791-22-0; 2-furan methanethiol, purity ≥98%; Photoinitiator 1173, purity ≥99%; all purchased from TCI-TCI (Shanghai) Chemical Industry Co., Ltd.

[0061] Vinyl isocyanate, purity ≥98%, CAS number 3555-94-0, purchased from Shenzhen Lisikang Pharmaceutical Technology Co., Ltd.

[0062] EVA resin, product number VA800, purchased from Shenzhen Wansuyuan Rubber & Plastics Co., Ltd.

[0063] Calcium-zinc composite heat stabilizer, model CZ101, manufactured by Zhejiang Jieshangjie New Material Co., Ltd.

[0064] The hindered phenolic antioxidant, brand name Topanol®CA-SF, is manufactured by Haoyi New Material Technology Co., Ltd.; the rest are commercially available.

[0065] Preliminary preparation 1:

[0066] Preparation of modified epoxidized soybean oil: (1) Under nitrogen protection, 1,4-bis(2',3'-epoxypropyl)perfluorobutane, 2-furan methanethiol, and triethylamine were added to toluene, stirred and heated to 100°C, and stirred for 30 h. The reaction was then stopped, and the mixture was allowed to cool naturally to room temperature. After vacuum distillation, furan-terminated perfluorobutane was obtained, wherein the mass ratio of 1,4-bis(2',3'-epoxypropyl)perfluorobutane, 2-furan methanethiol, triethylamine, and toluene was 1:0.74:0.055:10; (2) Under nitrogen protection, furan-terminated perfluorobutane and maleic anhydride were added to the reaction vessel, stirred and heated to 60°C. After stirring for 18 hours, the reaction was stopped. After cooling to room temperature, the mixture was filtered, washed with deionized water, and dried to obtain carboxyl-terminated perfluorobutane. The mass ratio of furan-terminated perfluorobutane and maleic anhydride was 1:0.41. (3) Under nitrogen protection, carboxyl-terminated perfluorobutane, epoxidized soybean oil, and zinc acetylacetonate were added to toluene. The mixture was stirred and heated to 100°C. After stirring for 8 hours, the reaction was stopped. After cooling to room temperature, the mixture was distilled under reduced pressure to obtain modified epoxidized soybean oil. The mass ratio of carboxyl-terminated perfluorobutane, epoxidized soybean oil, zinc acetylacetonate, and toluene was 1:2.88:0.055:10.

[0067] Preparation of toughening agent: Dinonyl phthalate, tricresyl phosphate and modified epoxidized soybean oil are mixed and compounded in a mass ratio of 1:1:2.5 to obtain toughening agent.

[0068] Preliminary preparation 2:

[0069] The acrylate monomer is prepared by mixing and compounding methyl acrylate, ethyl acrylate, butyl acrylate and isooctyl acrylate in a mass ratio of 1:1:1:1.

[0070] Example 1: A method for preparing a water-resistant and electrical breakdown-resistant PVC insulating electrical tape:

[0071] S1: Preparation of PVC film layer:

[0072] S11: Preparation of insulating filler: (1) Add boron nitride nanoparticles to 30wt% hydrogen peroxide aqueous solution, ultrasonically disperse at 90℃ for 1h, filter, wash and dry to obtain hydroxylated boron nitride nanoparticles, wherein the mass ratio of boron nitride nanoparticles to hydrogen peroxide aqueous solution is 1g:25mL; (2) Mix hydroxylated boron nitride nanoparticles and kaolin micron particles at a mass ratio of 1.5:3.5 to obtain mixed filler; (3) Add mixed filler, epoxidized soybean oil and zinc acetylacetone to toluene, stir and heat to 100℃, stir and react for 8h, stop the reaction, filter, wash and dry to obtain insulating filler, wherein the mass ratio of mixed filler, epoxidized soybean oil, zinc acetylacetone and toluene is 1:0.3:0.025:10;

[0073] S12: PVC resin, insulating filler, toughening agent, calcium-zinc composite heat stabilizer, chlorinated paraffin, and hindered phenolic antioxidant are added to the extruder according to the formula ratio. The mixture is stirred and mixed for 1.5 hours at a temperature of 160℃ and a stirring speed of 250r / min. The mixture is then extruded to obtain a PVC film layer with a thickness of 0.16mm.

[0074] The PVC film layer includes the following raw material components: by weight, 50 parts PVC resin, 12.5 parts insulating filler, 17.5 parts toughening agent, 3 parts calcium-zinc composite heat stabilizer, 0.5 parts chlorinated paraffin, and 1 part hindered phenolic antioxidant.

[0075] S2: Set the base coating layer:

[0076] S21: Acrylic ester monomer, methacrylic acid, photoinitiator 1173, and hindered phenolic antioxidant are mixed evenly according to the formula ratio to obtain the primer slurry;

[0077] S22: Apply the primer slurry to any surface of the PVC film, and irradiate it with 365nm wavelength ultraviolet light at a power of 70W / cm for 10s to form a 1μm thick primer coating.

[0078] The base coating comprises the following raw material components: by weight, 50 parts acrylate monomer, 7 parts methacrylic acid, 2.5 parts photoinitiator 1173, and 0.75 parts hindered phenolic antioxidant;

[0079] S3: Set the pressure-sensitive adhesive layer:

[0080] S31: Acrylic ester monomer, EVA resin, and vinyl isocyanate are added to toluene to obtain the emulsion to be reacted, and the emulsion is divided into four equal parts; take one part of the emulsion to be reacted, add 30% of the formulated amount of benzoyl peroxide to it, stir and react at 80°C for 1 hour, then stir and dropwise add the remaining emulsion to be reacted and benzoyl peroxide to it, and continue stirring and reacting for 6 hours after the addition is complete; finally, add insulating filler and hindered phenolic antioxidant to it, stir and mix for 1 hour to obtain pressure-sensitive adhesive paste;

[0081] S32: Apply the pressure-sensitive adhesive paste to the base coating layer, dry it at 115℃ to form a 15μm thick pressure-sensitive adhesive layer, and finally roll it up to obtain a water-resistant and electrical breakdown-resistant PVC insulating electrical tape.

[0082] The pressure-sensitive adhesive layer comprises the following raw material components by weight: 50 parts acrylate monomer, 7.5 parts EVA resin, 7.5 parts insulating filler, 3 parts vinyl isocyanate, 2.5 parts benzoyl peroxide, 0.75 parts hindered phenolic antioxidant, and 100 parts toluene.

[0083] Example 2: A method for preparing a water-resistant and electrical breakdown-resistant PVC insulating electrical tape:

[0084] S1: Preparation of PVC film layer:

[0085] S11: Preparation of insulating filler: (1) Add boron nitride nanoparticles to 30wt% hydrogen peroxide aqueous solution, ultrasonically disperse at 90℃ for 1h, filter, wash and dry to obtain hydroxylated boron nitride nanoparticles, wherein the mass ratio of boron nitride nanoparticles to hydrogen peroxide aqueous solution is 1g:25mL; (2) Mix hydroxylated boron nitride nanoparticles and kaolin micron particles at a mass ratio of 1.5:3.5 to obtain mixed filler; (3) Add mixed filler, epoxidized soybean oil and zinc acetylacetone to toluene, stir and heat to 100℃, stir and react for 8h, stop the reaction, filter, wash and dry to obtain insulating filler, wherein the mass ratio of mixed filler, epoxidized soybean oil, zinc acetylacetone and toluene is 1:0.3:0.025:10;

[0086] S12: PVC resin, insulating filler, toughening agent, calcium-zinc composite heat stabilizer, chlorinated paraffin, and hindered phenolic antioxidant are added to the extruder according to the formula ratio. The mixture is stirred and mixed for 1.5 hours at a temperature of 160℃ and a stirring speed of 250r / min. The mixture is then extruded to obtain a PVC film layer with a thickness of 0.16mm.

[0087] The PVC film layer includes the following raw material components: by weight, 50 parts PVC resin, 10 parts insulating filler, 15 parts toughening agent, 3 parts calcium-zinc composite heat stabilizer, 0.5 parts chlorinated paraffin, and 1 part hindered phenolic antioxidant.

[0088] S2: Set the base coating layer:

[0089] S21: Acrylic ester monomer, methacrylic acid, photoinitiator 1173, and hindered phenolic antioxidant are mixed evenly according to the formula ratio to obtain the primer slurry;

[0090] S22: Apply the primer slurry to any surface of the PVC film, and irradiate it with 365nm wavelength ultraviolet light at a power of 70W / cm for 10s to form a 1μm thick primer coating.

[0091] The base coating comprises the following raw material components: by weight, 50 parts acrylate monomer, 7 parts methacrylic acid, 2.5 parts photoinitiator 1173, and 0.75 parts hindered phenolic antioxidant;

[0092] S3: Set the pressure-sensitive adhesive layer:

[0093] S31: Acrylic ester monomer, EVA resin, and vinyl isocyanate are added to toluene to obtain the emulsion to be reacted, and the emulsion is divided into four equal parts; take one part of the emulsion to be reacted, add 30% of the formulated amount of benzoyl peroxide to it, stir and react at 80°C for 1 hour, then stir and dropwise add the remaining emulsion to be reacted and benzoyl peroxide to it, and continue stirring and reacting for 6 hours after the addition is complete; finally, add insulating filler and hindered phenolic antioxidant to it, stir and mix for 1 hour to obtain pressure-sensitive adhesive paste;

[0094] S32: Apply the pressure-sensitive adhesive paste to the base coating layer, dry it at 115℃ to form a 15μm thick pressure-sensitive adhesive layer, and finally roll it up to obtain a water-resistant and electrical breakdown-resistant PVC insulating electrical tape.

[0095] The pressure-sensitive adhesive layer comprises the following raw material components: by weight, 50 parts acrylate monomer, 8 parts EVA resin, 5 parts insulating filler, 3 parts vinyl isocyanate, 2.5 parts benzoyl peroxide, 0.75 parts hindered phenolic antioxidant, and 100 parts toluene.

[0096] Example 3: A method for preparing a water-resistant and electrical breakdown-resistant PVC insulating electrical tape:

[0097] S1: Preparation of PVC film layer:

[0098] S11: Preparation of insulating filler: (1) Add boron nitride nanoparticles to 30wt% hydrogen peroxide aqueous solution, ultrasonically disperse at 90℃ for 1h, filter, wash and dry to obtain hydroxylated boron nitride nanoparticles, wherein the mass ratio of boron nitride nanoparticles to hydrogen peroxide aqueous solution is 1g:25mL; (2) Mix hydroxylated boron nitride nanoparticles and kaolin micron particles at a mass ratio of 1.5:3.5 to obtain mixed filler; (3) Add mixed filler, epoxidized soybean oil and zinc acetylacetone to toluene, stir and heat to 100℃, stir and react for 8h, stop the reaction, filter, wash and dry to obtain insulating filler, wherein the mass ratio of mixed filler, epoxidized soybean oil, zinc acetylacetone and toluene is 1:0.3:0.025:10;

[0099] S12: PVC resin, insulating filler, toughening agent, calcium-zinc composite heat stabilizer, chlorinated paraffin, and hindered phenolic antioxidant are added to the extruder according to the formula ratio. The mixture is stirred and mixed for 1.5 hours at a temperature of 160℃ and a stirring speed of 250r / min. The mixture is then extruded to obtain a PVC film layer with a thickness of 0.16mm.

[0100] The PVC film layer includes the following raw material components: by weight, 50 parts PVC resin, 15 parts insulating filler, 20 parts toughening agent, 3 parts calcium-zinc composite heat stabilizer, 0.5 parts chlorinated paraffin, and 1 part hindered phenolic antioxidant.

[0101] S2: Set the base coating layer:

[0102] S21: Acrylic ester monomer, methacrylic acid, photoinitiator 1173, and hindered phenolic antioxidant are mixed evenly according to the formula ratio to obtain the primer slurry;

[0103] S22: Apply the primer slurry to any surface of the PVC film, and irradiate it with 365nm wavelength ultraviolet light at a power of 70W / cm for 10s to form a 1μm thick primer coating.

[0104] The base coating comprises the following raw material components: by weight, 50 parts acrylate monomer, 7 parts methacrylic acid, 2.5 parts photoinitiator 1173, and 0.75 parts hindered phenolic antioxidant;

[0105] S3: Set the pressure-sensitive adhesive layer:

[0106] S31: Acrylic ester monomer, EVA resin, and vinyl isocyanate are added to toluene to obtain the emulsion to be reacted, and the emulsion is divided into four equal parts; take one part of the emulsion to be reacted, add 30% of the formulated amount of benzoyl peroxide to it, stir and react at 80°C for 1 hour, then stir and dropwise add the remaining emulsion to be reacted and benzoyl peroxide to it, and continue stirring and reacting for 6 hours after the addition is complete; finally, add insulating filler and hindered phenolic antioxidant to it, stir and mix for 1 hour to obtain pressure-sensitive adhesive paste;

[0107] S32: Apply the pressure-sensitive adhesive paste to the base coating layer, dry it at 115℃ to form a 15μm thick pressure-sensitive adhesive layer, and finally roll it up to obtain a water-resistant and electrical breakdown-resistant PVC insulating electrical tape.

[0108] The pressure-sensitive adhesive layer comprises the following raw material components: by weight, 50 parts acrylate monomer, 8 parts EVA resin, 10 parts insulating filler, 3 parts vinyl isocyanate, 2.5 parts benzoyl peroxide, 0.75 parts hindered phenolic antioxidant, and 100 parts toluene.

[0109] The following is a control experiment based on Example 1, with comparative examples 1 to 5, as detailed below:

[0110] Comparative Example 1: Comparative Example 1 is based on Example 1, with the following adjustment: modified epoxidized soybean oil is not added to the toughening agent, while other processes remain unchanged. Specifically:

[0111] A method for preparing water-resistant and electrical breakdown-resistant PVC insulating electrical tape:

[0112] S1: Preparation of PVC film layer:

[0113] S11: Preparation of insulating filler: (1) Add boron nitride nanoparticles to 30wt% hydrogen peroxide aqueous solution, ultrasonically disperse at 90℃ for 1h, filter, wash and dry to obtain hydroxylated boron nitride nanoparticles, wherein the mass ratio of boron nitride nanoparticles to hydrogen peroxide aqueous solution is 1g:25mL; (2) Mix hydroxylated boron nitride nanoparticles and kaolin micron particles at a mass ratio of 1.5:3.5 to obtain mixed filler; (3) Add mixed filler, epoxidized soybean oil and zinc acetylacetone to toluene, stir and heat to 100℃, stir and react for 8h, stop the reaction, filter, wash and dry to obtain insulating filler, wherein the mass ratio of mixed filler, epoxidized soybean oil, zinc acetylacetone and toluene is 1:0.3:0.025:10;

[0114] S12: Preparation of toughening agent: Dinonyl phthalate and tricresyl phosphate are mixed and compounded in a mass ratio of 1:1 to obtain toughening agent;

[0115] S13: PVC resin, insulating filler, toughening agent, calcium-zinc composite heat stabilizer, chlorinated paraffin, and hindered phenolic antioxidant are added to the extruder according to the formula ratio. The mixture is stirred and mixed for 1.5 hours at a temperature of 160℃ and a stirring speed of 250r / min. The mixture is then extruded to obtain a PVC film layer with a thickness of 0.16mm.

[0116] The PVC film layer includes the following raw material components: by weight, 50 parts PVC resin, 12.5 parts insulating filler, 17.5 parts toughening agent, 3 parts calcium-zinc composite heat stabilizer, 0.5 parts chlorinated paraffin, and 1 part hindered phenolic antioxidant.

[0117] Comparative Example 2: Comparative Example 2 is based on Example 1, with the following adjustment: only kaolin micron particles were added to the insulating filler, while other processes remained unchanged. Specifically:

[0118] A method for preparing water-resistant and electrical breakdown-resistant PVC insulating electrical tape:

[0119] S1: Preparation of PVC film layer:

[0120] S11: Preparation of insulating filler: (1) Add kaolin micron particles, epoxidized soybean oil, and zinc acetylacetonate to toluene, stir and heat to 100°C, stir and react for 8 hours, stop the reaction, filter, wash and dry to obtain insulating filler, wherein the mass ratio of kaolin micron particles, epoxidized soybean oil, zinc acetylacetonate and toluene is 1:0.3:0.025:10;

[0121] S12: PVC resin, insulating filler, toughening agent, calcium-zinc composite heat stabilizer, chlorinated paraffin, and hindered phenolic antioxidant are added to the extruder according to the formula ratio. The mixture is stirred and mixed for 1.5 hours at a temperature of 160℃ and a stirring speed of 250r / min. The mixture is then extruded to obtain a PVC film layer with a thickness of 0.16mm.

[0122] The PVC film layer includes the following raw material components: by weight, 50 parts PVC resin, 12.5 parts insulating filler, 17.5 parts toughening agent, 3 parts calcium-zinc composite heat stabilizer, 0.5 parts chlorinated paraffin, and 1 part hindered phenolic antioxidant.

[0123] Comparative Example 3: Comparative Example 3 is based on Example 1, with the following adjustment: no treatment is applied to the filler, while other processes remain unchanged. Specifically:

[0124] A method for preparing water-resistant and electrical breakdown-resistant PVC insulating electrical tape:

[0125] S1: Preparation of PVC film layer:

[0126] S11: Preparation of insulating filler: Boron nitride nanoparticles and kaolin micron particles are mixed evenly at a mass ratio of 1.5:3.5 to obtain insulating filler;

[0127] S12: PVC resin, insulating filler, toughening agent, calcium-zinc composite heat stabilizer, chlorinated paraffin, and hindered phenolic antioxidant are added to the extruder according to the formula ratio. The mixture is stirred and mixed for 1.5 hours at a temperature of 160℃ and a stirring speed of 250r / min. The mixture is then extruded to obtain a PVC film layer with a thickness of 0.16mm.

[0128] The PVC film layer includes the following raw material components: by weight, 50 parts PVC resin, 12.5 parts insulating filler, 17.5 parts toughening agent, 3 parts calcium-zinc composite heat stabilizer, 0.5 parts chlorinated paraffin, and 1 part hindered phenolic antioxidant.

[0129] Comparative Example 4: Comparative Example 4 is based on Example 1, with the following adjustment: methacrylic acid is not added to the base coating material, while other processes remain unchanged. Specifically:

[0130] A method for preparing water-resistant and electrical breakdown-resistant PVC insulating electrical tape:

[0131] S2: Set the base coating layer:

[0132] S21: Acrylic monomer, photoinitiator 1173, and hindered phenolic antioxidant are mixed evenly according to the formula ratio to obtain the primer slurry;

[0133] S22: Apply the primer slurry to any surface of the PVC film, and irradiate it with 365nm wavelength ultraviolet light at a power of 70W / cm for 10s to form a 1μm thick primer coating.

[0134] The base coating comprises the following raw material components: by weight, 57 parts acrylate monomer, 2.5 parts photoinitiator 1173, and 0.75 parts hindered phenolic antioxidant.

[0135] Comparative Example 5: Comparative Example 5 is based on Example 1, with the following adjustment: unsaturated isocyanate is not added to the pressure-sensitive adhesive layer raw material, while other processes remain unchanged. Specifically:

[0136] A method for preparing water-resistant and electrical breakdown-resistant PVC insulating electrical tape:

[0137] S3: Set the pressure-sensitive adhesive layer:

[0138] S31: Acrylic ester monomer and EVA resin are added to toluene to obtain the emulsion to be reacted, and the emulsion is divided into four equal parts; take one part of the emulsion to be reacted, add 30% of the formulated amount of benzoyl peroxide to it, stir and react at 80°C for 1 hour, then stir and dropwise add the remaining emulsion to be reacted and benzoyl peroxide to it. After the addition is complete, continue stirring and reacting for 6 hours; finally, add insulating filler and hindered phenolic antioxidant to it, stir and mix for 1 hour to obtain pressure-sensitive adhesive paste;

[0139] S32: Apply the pressure-sensitive adhesive paste to the base coating layer, dry it at 115℃ to form a 15μm thick pressure-sensitive adhesive layer, and finally roll it up to obtain a water-resistant and electrical breakdown-resistant PVC insulating electrical tape.

[0140] The pressure-sensitive adhesive layer comprises the following raw material components: by weight, 53 parts acrylate monomer, 7.5 parts EVA resin, 7.5 parts insulating filler, 2.5 parts benzoyl peroxide, 0.75 parts hindered phenolic antioxidant, and 100 parts toluene.

[0141] Performance testing: The water-resistant and electrical breakdown-resistant PVC insulating electrical tapes prepared in Examples 1-3 and Comparative Examples 1-5 were subjected to tensile property tests, electrical breakdown resistance tests, water resistance tests, and adhesion tests. The specific test methods are as follows:

[0142] 1. Tensile property test: The tensile properties of the tape are tested according to GB / T 1040.1-2018 standard;

[0143] 2. Electrical breakdown resistance test: The electrical breakdown strength of the tape is tested using an electrical breakdown strength tester;

[0144] 3. Water resistance test: Place the tape in a 95% humidity environment for 3 hours, remove it, wipe it dry, and immediately test the electrical breakdown strength of the tape using an electrical breakdown strength tester;

[0145] 4. Adhesion performance test: According to the standard GB / T 4851-2014, the adhesion performance of the tape is tested and the peeling of the pressure-sensitive adhesive layer is observed. It is divided into: no peeling, slight peeling (0≤peeling area≤15%), partial peeling (15<peeling area≤50%), severe peeling (50%<peeling area<100%), and complete peeling (peeling area=100%).

[0146] The results of the above tests are shown in Table 1 below:

[0147] Table 1

[0148] ;

[0149] Results Analysis: As can be seen from the data in Table 1 above, this invention comprehensively prepares a PVC insulating tape with excellent tensile properties, excellent electrical insulation properties, and excellent adhesion properties by compounding and modifying fillers, preparing modified epoxidized soybean oil and compounding toughening agents, and setting a base layer and a pressure-sensitive adhesive layer.

[0150] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A water and electric shock resistant PVC insulated electrical tape, characterized in that: The PVC film layer and the adhesive layer arranged on one surface of the PVC film layer; The adhesive layer comprises a primer layer directly contacting the PVC film layer and a pressure-sensitive adhesive layer arranged on another surface of the primer layer; The PVC film layer comprises the following raw material components: 50 parts of PVC resin, 10-15 parts of insulating filler, 15-20 parts of toughening agent, 2-4 parts of heat stabilizer, 0.25-0.75 parts of lubricant and 0.5-1.5 parts of antioxidant by weight; The toughening agent is obtained by mixing and compounding dinonyl phthalate, trimethylphenyl phosphate and modified epoxy soybean oil at a mass ratio of 1:1:(2-3); The primer layer comprises the following raw material components: 50 parts of acrylate monomer, 6-8 parts of unsaturated acid, 2-3 parts of photoinitiator and 0.5-1 part of antioxidant by weight; The pressure-sensitive adhesive layer comprises the following raw material components: 50 parts of acrylate monomer, 5-10 parts of EVA resin, 5-10 parts of insulating filler, 2-4 parts of unsaturated isocyanate, 2-3 parts of initiator, 0.5-1 part of antioxidant and 100 parts of toluene by weight; The preparation method of the modified epoxy soybean oil is as follows: (1) Under nitrogen protection, 1,4-bis(2',3'-epoxypropyl) perfluorobutane, 2-furfuryl mercaptan and triethylamine are added into toluene, stirred and heated to 95-105 DEG C, stirred and reacted for 6-48 h, the reaction is ended, and the mixture is naturally cooled to room temperature, and then subjected to reduced pressure distillation to obtain furan-terminated perfluorobutane; (2) Under nitrogen protection, the furan-terminated perfluorobutane and maleic anhydride are added into a reaction container, stirred and heated to 55-65 DEG C, stirred and reacted for 6-24 h, the reaction is ended, and the mixture is naturally cooled to room temperature, and then subjected to filtration, deionized water washing and drying to obtain carboxyl-terminated perfluorobutane; (3) Under nitrogen protection, the carboxyl-terminated perfluorobutane, epoxy soybean oil and zinc acetylacetone are added into toluene, stirred and heated to 95-105 DEG C, stirred and reacted for 4-12 h, the reaction is ended, and the mixture is naturally cooled to room temperature, and then subjected to reduced pressure distillation to obtain modified epoxy soybean oil; The mass ratio of the 1,4-bis(2',3'-epoxypropyl) perfluorobutane, 2-furfuryl mercaptan, triethylamine and toluene is 1:(0.72-0.76):(0.05-0.06):10; The mass ratio of the furan-terminated perfluorobutane and maleic anhydride is 1:(0.39-0.42); The mass ratio of the carboxyl-terminated perfluorobutane, epoxy soybean oil, zinc acetylacetone and toluene is 1:(2.85-2.9):(0.05-0.06):10; The preparation method of the insulating filler is as follows: (1) The boron nitride nanoparticles are added into 30wt% hydrogen peroxide aqueous solution, ultrasonically dispersed at 80-100 DEG C for 0.5-1 h, and then subjected to filtration, washing and drying to obtain hydroxylated boron nitride nanoparticles; (2) The hydroxylated boron nitride nanoparticles and kaolin microparticles are mixed uniformly at a mass ratio to obtain a mixed filler; (3) the mixed filler, epoxy soybean oil, zinc acetylacetone is added to toluene, stirring to 95~105℃, stirring reaction 4~12h, end reaction, by filtration, washing, drying, get insulation filler; The ratio of the boron nitride nanoparticles and the hydrogen peroxide aqueous solution is 1g:25mL; The mass ratio of the hydroxylated boron nitride nanoparticles and the kaolin microparticles is (1~2):(3~4); The average particle size of the boron nitride nanoparticles is ≤100nm; The average particle size of the kaolin microparticles is 0.1~3μm; The mass ratio of the mixed filler, epoxy soybean oil, zinc acetylacetone, toluene is 1:(0.2~0.4):(0.02~0.03):

10.

2. A water and electric shock resistant PVC insulated electrical tape according to claim 1, characterized in that: The heat stabilizer is a calcium-zinc composite heat stabilizer; The lubricant is any one of paraffin and chlorinated paraffin; The antioxidant is a hindered phenol type antioxidant.

3. The water and electric shock resistant PVC insulated electrical tape of claim 1, wherein: The acrylate monomer includes one or a combination of several of methyl acrylate, ethyl acrylate, butyl acrylate, and isooctyl acrylate.

4. The water and electric shock resistant PVC insulated electrical tape of claim 1, wherein: The unsaturated acid includes one or a combination of several of acrylic acid, methacrylic acid, 2-propyl acrylate, and 4-pentenoic acid.

5. The water and electric shock resistant PVC insulated electrical tape of claim 1, wherein: The unsaturated isocyanate includes one or a combination of several of vinyl isocyanate, allyl isocyanate, isocyanate acrylate, and isocyanato methyl methacrylate.

6. The water and electric shock resistant PVC insulated electrical tape of claim 1, wherein: The photoinitiator is photoinitiator 1173; The initiator is benzoyl peroxide.

7. The method of manufacturing a water and electric shock resistant PVC insulated electrical tape according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: S1: PVC resin, insulation filler, toughening agent, heat stabilizer, lubricant, antioxidant are added into the extruder according to the formula ratio, stirred and mixed at a temperature of 150~160℃ and a stirring speed of 200~300r / min for 1~2h, and then extruded to form a PVC film layer; S2: a primer layer is provided; S21: acrylate monomer, unsaturated acid, photoinitiator, antioxidant are mixed uniformly according to the formula ratio to obtain primer slurry; S22: the primer slurry is coated on any surface of the PVC film, and a 365nm wavelength ultraviolet light is used to irradiate and treat for 10~15s at a power of 60~80W / cm to form a primer layer; S3: a pressure-sensitive adhesive layer is provided; S31: acrylate monomer, EVA resin, and unsaturated isocyanate are added into toluene to obtain a reaction emulsion, which is divided into four equal parts; one part of the reaction emulsion is taken, 30% of the initiator according to the formula is added, and stirring reaction is carried out at 75~85℃ for 0.5~1h; then the remaining reaction emulsion and initiator are added dropwise, and after the dropwise addition is completed, stirring reaction is continued for 3~6h; finally, insulation filler and antioxidant are added, and stirring and mixing are carried out for 0.5~1h to obtain pressure-sensitive adhesive slurry; S32: the pressure-sensitive adhesive slurry is coated on the primer layer, dried at 110~115℃ to form a pressure-sensitive adhesive layer, and finally wound to obtain a water-resistant and electric shock-resistant PVC insulation electrical tape.

8. A process for the preparation of a water and electric shock resistant PVC insulated electrical tape as claimed in claim 7, wherein: The thickness of the PVC film layer is 0.12~0.2mm; The thickness of the primer layer is 0.1~2μm; The thickness of the pressure-sensitive adhesive layer is 5~20μm.