High-viscosity tensile-resistant PVC electrical tape and method of making same

Abstract

The application discloses a high-viscosity tensile PVC electrician adhesive tape and a preparation method thereof, and relates to the technical field of adhesive tapes, which comprises an acrylate adhesive solution and a polyvinyl chloride film, and the polyvinyl chloride film is coated with the acrylate adhesive solution. The application introduces benzyl methacrylate to form a copolymer with soft and hard chain segment structures, thereby improving the adhesion and cohesion of the acrylate adhesive solution; the benzene ring structure of the benzyl methacrylate improves the heat resistance of the adhesive solution, and further improves the comprehensive performance of the PVC electrician adhesive tape.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of adhesive tape, in particular to a high-viscosity tensile PVC electrical tape and a preparation method thereof. BACKGROUND

[0002] With the rapid development of the power industry, electrical safety issues are increasingly important in industrial production and daily life. Electrical tape is widely used in the insulation and fixation of electrical equipment and electrical cables, and plays an indispensable role in preventing electrical accidents, protecting lines and ensuring stable operation of equipment.

[0003] In particular, in high-end fields such as automobile manufacturing, aerospace, rail transportation and new energy, electrical tape faces more stringent performance requirements. For example, in high-temperature operating environments, electrical tape used in electrical equipment must withstand long-term high-temperature tests without failure and must have excellent flame retardant properties to prevent the spread of fire. Therefore, a high-viscosity tensile PVC electrical tape and a preparation method thereof are extremely important.

[0004] Patent document CN118146738B discloses a preparation method of PVC electrical tape. The patent achieves stable surface pressure-sensitive adhesive holding force and initial adhesion of electrical tape. Through the synergistic effect of hydroxyethyl acrylate and acrylic acid, the initial adhesion of the pressure-sensitive adhesive is improved while the holding force of the pressure-sensitive adhesive is maintained from decreasing, and the holding force of the pressure-sensitive adhesive on the surface of the electrical tape is improved.

[0005] In summary, the above patent solves the problem of poor holding force of the pressure-sensitive adhesive on the surface of the electrical tape caused by plasticizers, but there is still room for optimization in terms of heat resistance of the electrical tape. The present application improves the heat resistance of the surface adhesive of the electrical tape by introducing benzyl methacrylate, and solves the problem of easy failure of the electrical tape in high-temperature environments.

[0006] Therefore, the present application proposes a high-viscosity tensile PVC electrical tape with flame resistance and flame retardation and a preparation method thereof. SUMMARY

[0007] The present application aims to provide a high-viscosity tensile PVC electrical tape and a preparation method thereof to solve the technical problem of easy failure of the electrical tape in high-temperature environments as mentioned in the background.

[0008] To achieve the above object, the present application provides the following technical scheme: A high-viscosity tensile PVC electrical tape, comprising an acrylate glue solution and a polyvinyl chloride film, the polyvinyl chloride film is coated with the acrylate glue solution, the acrylate glue solution comprises the following components by weight: butyl acrylate 40-80 parts, benzyl methacrylate 5-20 parts, pentafluorobenzyl acrylate 10-15 parts, hydroxyethyl acrylate 0.5-2 parts, acrylic acid 0.5-2 parts, flame retardant 5-10 parts, ethyl acetate 80-100 parts, ionic liquid 5-15 parts, initiator 0.1-0.5 parts, and the preparation method of the acrylate glue solution comprises the following steps:

[0009] (1) uniformly mix butyl acrylate, benzyl methacrylate, pentafluorobenzyl acrylate, hydroxyethyl acrylate, acrylic acid, flame retardant, ionic liquid, ethyl acetate, initiator to obtain a mixed solution;

[0010] (2) 50wt% of the mixed solution is added to a reaction container, nitrogen is filled into the reaction container, 50wt% of the initiator is added to the reaction container, stirring and heating are carried out;

[0011] (3) heating to 75℃, the remaining mixed solution and initiator are sequentially added dropwise into the reaction container, incubation for 4h, cooling and discharging to obtain the acrylate glue solution.

[0012] Preferably, the preparation method of the flame retardant comprises the following steps:

[0013] Methyl phosphonic acid diethyl ester acrylate, sodium dodecyl sulfate, sodium p-styrene sulfonate, triallyl isocyanate and deionized water are mixed to obtain a uniform pre-emulsion;

[0014] 20wt% of the pre-emulsion is added to a reaction container, sodium dodecyl sulfate, sodium p-styrene sulfonate, triallyl isocyanate and deionized water are added, the reaction container is heated to 80℃ and stirring is carried out;

[0015] The remaining pre-emulsion is slowly added dropwise into the reaction container, incubation for 2h, methyl methacrylate is added dropwise, incubation for 4h, and the reaction product is cooled, washed and dried to obtain the flame retardant.

[0016] Preferably, the polyvinyl chloride film comprises the following components by weight: PVC resin 100 parts, heat stabilizer 3 parts, plasticizer 40 parts, ammonium polyphosphate 15 parts, flame retardant material 5 parts, stearic acid 0.5 parts, calcium stearate 0.5 parts.

[0017] Preferably, the preparation method of the polyvinyl chloride film comprises the following steps:

[0018] PVC resin, heat stabilizer, plasticizer, ammonium polyphosphate, flame retardant material, stearic acid, calcium stearate are poured into a high-speed mixer, and uniformly mixed to obtain a mixture;

[0019] The mixture is poured into a mixing mill, and mixed at a temperature of 150℃ for 4-10min. The mixing product is poured into a mold, and hot-pressed at 160℃ for 5min on a flat vulcanizing machine, and cold-pressed for 5min to obtain a PVC composite material.

[0020] The rollers of a calender are preheated to 160-180℃, and the PVC composite material is calendered using the calender. The calendered film is cooled and cut to obtain a polyvinyl chloride film.

[0021] Preferably, the initiator is selected from one of azobisisobutyronitrile, dibenzoyl peroxide, methyl ethyl ketone peroxide, and azodicarbonamide.

[0022] Preferably, the ionic liquid is selected from one of 1-butyl-3-methylimidazolium bistrifluoromethylsulfonylimide, 1-vinyl-3-butylimidazolium chloride, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-ethyl-3-methylimidazolium acetate, and 1-butyl-3-methylimidazolium acetate.

[0023] Preferably, the preparation method of the flame retardant material comprises the following steps:

[0024] The reaction container is filled with nitrogen, toluene is added to the reaction container, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is dissolved in toluene, the reaction container is heated to 80℃, and a mechanical stirring device is used for stirring;

[0025] Vinyl triethoxysilane and azobisisobutyronitrile are sequentially added to the reaction container, the reaction container is cooled to room temperature after 24h of reaction, the reaction product is washed with deionized water, and the washed product is vacuum dried using a vacuum drying oven to obtain the flame retardant material.

[0026] Preferably, the heat stabilizer is selected from one of organic tin stabilizer, calcium-zinc stabilizer, and rare earth stabilizer, and the plasticizer is selected from one of dioctyl phthalate, dioctyl adipate, dimethyl sebacate, triphenyl phosphate, and trioctyl phosphate.

[0027] Preferably, the preparation method comprises the following steps:

[0028] S1, isophorone diisocyanate curing agent is added to the acrylate glue solution, and dibutyltin dilaurate catalyst is added, stirring is performed, and the glue solution sample is obtained after a period of time of standing and waiting for the disappearance of bubbles, and mass fraction ratio of 3:1 of tributyl phosphate and aluminum hydroxide is added, stirring and ultrasonic dispersion are performed, and the glue solution sample is obtained after a period of time of standing and waiting for the disappearance of bubbles.

[0029] S2, polyvinyl chloride film is laid on a coating machine, the adhesive sample is coated on the surface of the polyvinyl chloride film, the polyvinyl chloride film coated with the adhesive is placed in a drying oven, and is dried at 70 DEG C for 5 min, to obtain the PVC electrical tape.

[0030] Preferably, the preparation method further comprises the following steps:

[0031] S21, the PVC electrical tape is trimmed, and the PVC electrical tape is wound into a roll shape by using a winding machine, and the wound PVC electrical tape is packaged and stored.

[0032] Compared with the prior art, the beneficial effects of the present application are:

[0033] 1. The present application introduces benzyl methacrylate to form a copolymer with soft and hard segment structure, improves the adhesion and cohesion of the acrylate adhesive, the benzene ring structure of benzyl methacrylate improves the heat resistance of the adhesive, and further improves the comprehensive performance of the PVC electrical tape;

[0034] 2. The present application introduces pentafiuorobenzyl acrylate to enhance the interaction between the acrylate adhesive and the adherend surface, the fluorine atom in the pentafiuorobenzyl acrylate can reduce the polarity of the molecule, so that the adhesive can penetrate into the small gap of the adherend more easily, and the adhesion effect of the PVC electrical tape is improved;

[0035] 3. The present application introduces a flame retardant, takes methyldiethylphosphonate acrylate as a core layer monomer to form a microsphere core with flame retardant performance, improves the flame resistance of the acrylate adhesive, and takes methyl methacrylate as a shell layer monomer to ensure the compatibility of the flame retardant and the acrylate adhesive;

[0036] 4. The present application introduces ionic liquid to improve the wettability and adhesion of the acrylate adhesive to the surface of the adherend, the imidazole cation in the ionic liquid has an ion-dipole interaction with the group of the acrylate copolymer, improves the toughness of the adhesive, thereby improving the peeling strength and ensuring the durability of the paste. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is the preparation process schematic diagram of the acrylate adhesive of the present application;

[0038] Figure 2 It is the preparation process schematic diagram of the flame retardant of the present application;

[0039] Figure 3 It is the preparation process schematic diagram of the polyvinyl chloride film of the present application;

[0040] Figure 4 It is the preparation process schematic diagram of the flame retardant material of the present application;

[0041] Figure 5 Preparation flowchart of PVC electrical tape of the present application;

[0042] Figure 6 Schematic diagram of ionic liquid of the present application;

[0043] Figure 7 Schematic diagram of initiator of the present application;

[0044] Figure 8 Schematic diagram of heat stabilizer of the present application. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0046] Example 1, please refer to Figure 1 , Figure 5 and Figure 7 , a high-viscosity tensile-resistant PVC electrical tape, comprising an acrylate glue solution and a polyvinyl chloride film, the polyvinyl chloride film being coated with the acrylate glue solution, and a preparation method of the PVC electrical tape comprising the following steps:

[0047] (1) 80 parts of butyl acrylate, 20 parts of benzyl methacrylate, 15 parts of pentafluorobenzyl acrylate, 2 parts of hydroxyethyl acrylate, 2 parts of acrylic acid, 10 parts of a flame retardant, 100 parts of ethyl acetate, 15 parts of an ionic liquid, and 0.5 parts of an initiator are uniformly mixed to obtain a mixed solution, 50 wt% of the mixed solution is added to a reaction container, nitrogen is filled into the reaction container, 50 wt% of the initiator is added to the reaction container, stirring and heating are performed, after heating to 75°C, the remaining mixed solution is added dropwise to the reaction container, incubation is performed for 4 h, the material is cooled and discharged, and an acrylate glue solution is obtained;

[0048] (2) isophorone diisocyanate curing agent is added to the acrylate glue solution, and a dibutyltin dilaurate catalyst is added, stirring is performed, and after standing for a period of time, bubbles are allowed to disappear, phosphoric acid tributyl ester and aluminum hydroxide with a mass fraction ratio of 3:1 are added, stirring and ultrasonic dispersion are performed, and after standing for a period of time, bubbles are allowed to disappear, a glue solution sample is obtained, a polyvinyl chloride film is laid on a coating machine, the glue solution sample is coated on the surface of the polyvinyl chloride film, the polyvinyl chloride film coated with the glue solution is placed in a drying oven, and drying is performed at 70°C for 5 min, and a PVC electrical tape is obtained.

[0049] Further, the benzene ring structure of benzyl methacrylate makes it have certain rigidity, when benzyl methacrylate is copolymerized with butyl acrylate, hydroxyethyl acrylate, acrylic acid and other monomers, a copolymer with a specific segment structure and performance is formed, wherein the benzene ring structure of benzyl methacrylate forms a hard segment in the copolymer, and other monomers form a soft segment, the soft and hard segment structure makes the copolymer exhibit good adhesion and cohesion, so that the prepared acrylate glue solution can be firmly adhered to the surface of the adherend, and when subjected to external force, it can maintain certain strength and toughness, at the same time, the hard segment helps to improve the heat resistance of the acrylate glue solution, thereby improving the comprehensive performance of the PVC adhesive tape;

[0050] The fluorine atom in the fluorine-containing monomer pentafluorobenzyl acrylate has a larger electronegativity and a smaller atomic radius, so that the C-F bond has a shorter bond length and a higher bond energy, compared with the C-C bond and the C-H bond, the C-F bond is more difficult to break under high temperature conditions, thereby giving the copolymer higher thermal stability, effectively improving the heat resistance of the acrylate glue solution, when pentafluorobenzyl acrylate participates in the copolymerization reaction, the fluorine atom and its connected benzene ring structure will introduce certain steric hindrance in the polymer segment, this steric hindrance effect prevents the close packing and entanglement of the copolymer segment, thereby improving the adhesion performance of the acrylate glue solution, at the same time, pentafluorobenzyl acrylate reduces the surface energy of the acrylate glue solution, improves the adhesion to the surface of the adherend.

[0051] Example 2, see Figure 1 , Figure 2 , Figure 5 and Figure 7 , a high-viscosity tensile PVC electrical tape, comprising an acrylate glue solution and a polyvinyl chloride film, the polyvinyl chloride film is coated with an acrylate glue solution, the preparation method of the PVC electrical tape comprises the following steps:

[0052] (1) mix methyl phosphonic acid diethyl ester acrylate, sodium dodecyl sulfate, sodium p-styrene sulfonate, triallyl isocyanate, and deionized water to obtain a uniform pre-emulsion, add 20wt% of the pre-emulsion to a reaction container, add sodium dodecyl sulfate, sodium p-styrene sulfonate, triallyl isocyanate, and deionized water, heat the reaction container to 80℃ and stir, slowly add the remaining pre-emulsion to the reaction container, keep warm for 2h, add methyl methacrylate, keep warm for 4h, cool, wash and dry the reaction product to obtain a flame retardant;

[0053] (2) 75 parts of butyl acrylate, 18 parts of benzyl methacrylate, 14 parts of pentafluorobenzyl acrylate, 2 parts of hydroxyethyl acrylate, 2 parts of acrylic acid, 9 parts of a flame retardant, 100 parts of ethyl acetate, 15 parts of an ionic liquid, and 0.5 parts of an initiator are uniformly mixed to obtain a mixed solution, 50 wt% of the mixed solution is added to a reaction container, nitrogen is filled into the reaction container, 50 wt% of the initiator is added to the reaction container, stirring and heating are performed, after heating to 75°C, the remaining mixed solution is added dropwise to the reaction container, incubation is performed for 4 h, and the material is discharged after cooling to obtain an acrylate glue solution;

[0054] (3) The isophorone diisocyanate curing agent is added to the acrylate glue solution, and the dibutyltin dilaurate catalyst is added, stirring is performed, and the glue solution sample is obtained after standing for a period of time to wait for the bubbles to disappear. The mass fraction ratio of tributyl phosphate to aluminum hydroxide is 3:1, stirring and ultrasonic dispersion are performed, and the glue solution sample is obtained after standing for a period of time to wait for the bubbles to disappear. The polyvinyl chloride film is laid on the coating machine, the glue solution sample is coated on the surface of the polyvinyl chloride film, the polyvinyl chloride film coated with the glue solution is placed in a drying oven, and drying is performed at 70°C for 5 min to obtain the PVC electrical tape.

[0055] Further, the core-shell microsphere flame retardant is prepared by taking methyl phosphonic acid diethyl ester acrylate as the core layer monomer, triallyl isocyanate as the core layer crosslinking agent, and methyl methacrylate as the shell layer monomer. Through the polymerization of methyl phosphonic acid diethyl ester acrylate, the microsphere core with flame retardant performance is formed. The phosphorus element in the methyl phosphonic acid diethyl ester acrylate can promote the formation of a carbon layer during combustion, insulate heat and oxygen, and dilute the combustible gas concentration, thereby improving the flame retardant performance of the PVC electrical tape. The use of methyl methacrylate, which has good compatibility with the acrylate glue solution matrix, for polymerization helps the core-shell microsphere flame retardant to be uniformly dispersed in the acrylate glue solution, avoiding the performance decline of the glue solution caused by the local over-concentration of the flame retardant. At the same time, the microsphere structure increases the contact area between the flame retardant and the glue solution, thereby improving the flame retardant effect.

[0056] Example 3, please refer to Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 8 A high-viscosity tensile PVC electrical tape includes an acrylate glue solution and a polyvinyl chloride film, and the polyvinyl chloride film is coated with the acrylate glue solution. The preparation method of the PVC electrical tape includes the following steps:

[0057] (1) 70 parts of butyl acrylate, 16 parts of benzyl methacrylate, 13 parts of pentafluorobenzyl acrylate, 2 parts of hydroxyethyl acrylate, 2 parts of acrylic acid, 8 parts of a flame retardant, 100 parts of ethyl acetate, 15 parts of an ionic liquid, and 0.5 parts of an initiator are uniformly mixed to obtain a mixed solution, 50 wt% of the mixed solution is added to a reaction container, nitrogen is filled into the reaction container, 50 wt% of the initiator is added to the reaction container, stirring and heating are performed, after heating to 75°C, the remaining mixed solution is added dropwise to the reaction container, incubation is performed for 4 h, and the product is cooled and discharged to obtain an acrylate glue solution;

[0058] (2) nitrogen is filled into a reaction container, toluene is added to the reaction container, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is dissolved in toluene, the reaction container is heated to 80°C, a mechanical stirring device is used for stirring, vinyltriethoxysilane and azobisisobutyronitrile are sequentially added to the reaction container, after reaction for 24 h, the reaction container is cooled to room temperature, the reaction product is washed with deionized water, and the washed product is vacuum dried using a vacuum drying box to obtain a flame retardant material;

[0059] (3) 100 parts of PVC resin, 3 parts of a heat stabilizer, 40 parts of a plasticizer, 15 parts of ammonium polyphosphate, 5 parts of a flame retardant material, 0.5 parts of stearic acid, and 0.5 parts of calcium stearate are poured into a high-speed mixer, uniformly mixed to obtain a mixture, the mixture is poured into a mixing mill, and mixing is performed at a temperature of 150°C for 4-10 min; the mixing product is poured into a mold, hot pressing is performed on a flat vulcanizing machine at 160°C for 5 min, and cold pressing is performed for 5 min to obtain a PVC composite material; the roll cylinder of a calender is preheated to 160-180°C, the PVC composite material is calendered using the calender, and the calendered film is cooled and cut to obtain a polyvinyl chloride film;

[0060] (4) isophorone diisocyanate curing agent is added to the acrylate glue solution, and dibutyltin dilaurate catalyst is added, stirring is performed, and the glue solution is left to stand for a period of time to wait for bubbles to disappear; tributyl phosphate and aluminum hydroxide with a mass fraction ratio of 3:1 are added, stirring and ultrasonic dispersion are performed, and the glue solution is left to stand for a period of time to wait for bubbles to disappear to obtain a glue solution sample; the polyvinyl chloride film is laid on a coating machine, the glue solution sample is coated on the surface of the polyvinyl chloride film, and the polyvinyl chloride film coated with the glue solution is placed in a drying oven and dried at 70°C for 5 min to obtain a PVC electrical tape.

[0061] Further, by 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and vinyl triethoxysilane addition reaction to generate flame retardant material, the flame retardant material is used with ammonium polyphosphate for PVC film, so as to obtain flame-retardant PVC film with phosphorus, nitrogen and silicon. In the combustion process of PVC electrical tape, ammonium polyphosphate and flame retardant material in PVC film release NH3, CO2, N2 and other gases, thereby diluting the oxygen concentration around the PVC film and reducing the burning speed; the phosphate groups generated by the decomposition of ammonium polyphosphate react with the hydroxyl groups in the PVC molecular chain to generate phosphate ester, and the phosphate ester catalyzes the cross-linking of the decomposition products of PVC into carbon at high temperature to form a carbon layer to isolate heat and oxygen; the active free radicals generated by the decomposition of ammonium polyphosphate and flame retardant material react with the active free radicals generated by the PVC film, thereby inhibiting or terminating the combustion chain reaction; ammonium polyphosphate and flame retardant material have a synergistic effect on PVC film, which not only plays their respective flame-retardant effects, but also further improves the flame-retardant performance of PVC film by enhancing the flame-retardant effect of the other party; the phosphate groups released by ammonium polyphosphate promote the formation of carbon layer, and the Si-O-Si structure released by flame retardant material can enhance the thermal stability of carbon layer, thereby further enhancing the protection effect of carbon layer.

[0062] Embodiment 4, please refer to Figure 1 , Figure 5 , Figure 6 and Figure 7 , a high-viscosity tensile PVC electrical tape, comprising an acrylate glue solution and a PVC film, the PVC film is coated with the acrylate glue solution, and the preparation method of the PVC electrical tape comprises the following steps:

[0063] (1) 70 parts of butyl acrylate, 14 parts of benzyl methacrylate, 12 parts of pentafluorobenzyl acrylate, 2 parts of hydroxyethyl acrylate, 2 parts of acrylic acid, 7 parts of flame retardant, 100 parts of ethyl acetate, 15 parts of ionic liquid, and 0.5 parts of initiator are uniformly mixed to obtain a mixed solution, 50wt% of the mixed solution is added to a reaction container, nitrogen is filled into the reaction container, 50wt% of the initiator is added to the reaction container, stirring and heating are performed, after heating to 75℃, the remaining mixed solution is added dropwise to the reaction container, incubated for 4h, cooled and discharged to obtain an acrylate glue solution;

[0064] (2) isophorone diisocyanate curing agent and dibutyltin dilaurate catalyst are added to the acrylate glue solution, stirring is performed, and a period of time is allowed to stand until the bubbles disappear, phosphorus acid tributyl ester and aluminum hydroxide with a mass fraction ratio of 3:1 are added, stirring and ultrasonic dispersion are performed, and a period of time is allowed to stand until the bubbles disappear to obtain a glue solution sample, the PVC film is laid on a coating machine, the glue solution sample is coated on the surface of the PVC film, and the PVC film coated with the glue solution is placed in a drying oven for drying at 70℃ for 5min to obtain a PVC electrical tape.

[0065] Further, the CF3 group in the ionic liquid imidazolium cation and the acrylic ester copolymer forms a strong intermolecular force through ion-dipole interaction, and this interaction enables the ionic liquid to be firmly combined on the molecular chain of the acrylic ester copolymer, forming a stable structure. When an external force attempts to destroy the structure of the acrylic ester sizing solution, the ion-dipole interaction will break first, thereby dissipating energy and improving the toughness of the acrylic ester sizing solution. At the same time, the ionic liquid itself has a low surface energy, and the introduction of the ionic liquid into the acrylic ester sizing solution can improve the wettability and adhesion of the acrylic ester sizing solution to the surface of the adherend.

[0066] Example 5, please refer to Figure 1 , Figure 5 and Figure 7 , a high-viscosity tensile PVC electrical tape, comprising an acrylic ester sizing solution and a polyvinyl chloride film, the polyvinyl chloride film being coated with the acrylic ester sizing solution, and the preparation method of the PVC electrical tape comprising the following steps:

[0067] (1) 70 parts of butyl acrylate, 12 parts of benzyl methacrylate, 11 parts of pentafluorobenzyl acrylate, 2 parts of hydroxyethyl acrylate, 2 parts of acrylic acid, 6 parts of a flame retardant, 100 parts of ethyl acetate, 15 parts of an ionic liquid, and 0.5 parts of an initiator are mixed uniformly to obtain a mixed solution, 50 wt% of the mixed solution is added to a reaction container, nitrogen is filled into the reaction container, 50 wt% of the initiator is added to the reaction container, stirring and heating are performed, after heating to 75°C, the remaining mixed solution is added dropwise to the reaction container, incubation is performed for 4 h, and the material is cooled and discharged to obtain an acrylic ester sizing solution;

[0068] (2) Isophorone diisocyanate curing agent and dibutyltin dilaurate catalyst are added to the acrylic ester sizing solution, stirring is performed, and a period of time is allowed to stand until the bubbles disappear, phosphoric acid tributyl ester and aluminum hydroxide with a mass fraction ratio of 3:1 are added, stirring and ultrasonic dispersion are performed, and a period of time is allowed to stand until the bubbles disappear to obtain a sizing solution sample, a polyvinyl chloride film is laid on a coating machine, the sizing solution sample is coated on the surface of the polyvinyl chloride film, the polyvinyl chloride film coated with the sizing solution is placed in a drying oven, and drying is performed at 70°C for 5 min to obtain a PVC electrical tape.

[0069] Further, tributyl phosphate and aluminum hydroxide are added to the acrylate glue solution to obtain a composite flame-retardant glue solution. The acrylate glue solution has excellent adhesion without affecting the mechanical properties, achieving a balance between the mechanical properties and flame-retardant properties of the glue solution sample. During the combustion process, the phosphoric acid, metaphosphoric acid and other compounds generated by the decomposition of tributyl phosphate react with the hydroxyl and carboxyl functional groups in the acrylate glue solution to form a stable phosphate ester structure. The phosphate ester structure is further crosslinked into carbon at high temperatures to form a dense carbon layer. The carbon layer acts as a heat barrier to effectively insulate heat and oxygen transmission, slowing down the combustion speed. The decomposition of aluminum hydroxide absorbs a large amount of heat and releases water vapor, thereby reducing the temperature of the combustion area and diluting the concentration of combustible gas, thereby inhibiting combustion. At the same time, the aluminum oxide residue formed after the decomposition of aluminum hydroxide has a high melting point and stability, which can act as a heat barrier to further insulate heat and oxygen transmission. The synergistic effect of tributyl phosphate and aluminum hydroxide further improves the flame retardancy of the PVC electrical tape.

[0070] Example 6, see Figure 1 , Figure 5 and Figure 7 A high-viscosity tensile PVC electrical tape includes an acrylate glue solution and a polyvinyl chloride film coated with the acrylate glue solution. The preparation method of the PVC electrical tape includes the following steps:

[0071] (1) 70 parts of butyl acrylate, 10 parts of benzyl methacrylate, 10 parts of pentafluorobenzyl acrylate, 2 parts of hydroxyethyl acrylate, 2 parts of acrylic acid, 5 parts of a flame retardant, 100 parts of ethyl acetate, 15 parts of an ionic liquid, and 0.5 parts of an initiator are uniformly mixed to obtain a mixed solution. 50wt% of the mixed solution is added to a reaction container, nitrogen is filled into the reaction container, 50wt% of the initiator is added to the reaction container, stirring and heating are performed, and after heating to 75℃, the remaining mixed solution is added dropwise to the reaction container, incubated for 4h, cooled and discharged to obtain an acrylate glue solution;

[0072] (2) Isophorone diisocyanate curing agent and dibutyltin dilaurate catalyst are added to the acrylate glue solution, stirring is performed, and after standing for a period of time, the bubbles disappear. Tributyl phosphate and aluminum hydroxide with a mass fraction ratio of 3:1 are added, stirring and ultrasonic dispersion are performed, and after standing for a period of time, the bubbles disappear to obtain a glue solution sample. The polyvinyl chloride film is laid on a coating machine, the glue solution sample is coated on the surface of the polyvinyl chloride film, and the polyvinyl chloride film coated with the glue solution is placed in a drying oven at 70℃ for 5min to obtain a PVC electrical tape.

[0073] Further, by adding the curing agent isophorone diisocyanate in the acrylate glue solution, cross-linking reaction between the copolymer molecular chains in the acrylate glue solution is promoted, thereby enhancing the cohesive energy of the glue solution, so that the PVC electrical tape is not prone to peeling or residual when subjected to external force, and helps the PVC electrical tape to exhibit better adhesion when adhering to the adherend.

[0074] Comparative Example 1, a high-viscosity tensile-resistant PVC electrical tape, comprising an acrylate glue solution and a polyvinyl chloride film, the polyvinyl chloride film being coated with the acrylate glue solution, the preparation method of the PVC electrical tape comprising the following steps:

[0075] (1) uniformly mix 80 parts of butyl acrylate, 20 parts of benzyl methacrylate, 15 parts of pentafluorobenzyl acrylate, 2 parts of hydroxyethyl acrylate, 2 parts of acrylic acid, 10 parts of a flame retardant, 100 parts of ethyl acetate, 10 parts of an ionic liquid, and 0.5 parts of an initiator to obtain a mixed solution, add 50 wt% of the mixed solution to a reaction container, fill the reaction container with nitrogen, add 50 wt% of the initiator to the reaction container, stir and heat, after heating to 75°C, drop the remaining mixed solution into the reaction container, incubate for 4 h, cool and discharge to obtain an acrylate glue solution;

[0076] (2) add isophorone diisocyanate curing agent to the acrylate glue solution, and add dibutyltin dilaurate catalyst, stir, stand for a period of time to wait for the bubbles to disappear, add phosphorus acid tributyl ester and aluminum hydroxide in a mass fraction ratio of 3:1, stir and ultrasonic disperse, stand for a period of time to wait for the bubbles to disappear, to obtain a glue solution sample, lay the polyvinyl chloride film on a coating machine, coat the glue solution sample on the surface of the polyvinyl chloride film, place the polyvinyl chloride film coated with the glue solution in a drying oven, dry at 70°C for 5 min, to obtain a PVC electrical tape

[0077] Comparative Example 2, a high-viscosity tensile-resistant PVC electrical tape, comprising an acrylate glue solution and a polyvinyl chloride film, the polyvinyl chloride film being coated with the acrylate glue solution, the preparation method of the PVC electrical tape comprising the following steps:

[0078] (1) uniformly mix 80 parts of butyl acrylate, 20 parts of benzyl methacrylate, 15 parts of pentafluorobenzyl acrylate, 2 parts of hydroxyethyl acrylate, 2 parts of acrylic acid, 10 parts of a flame retardant, 100 parts of ethyl acetate, 15 parts of an ionic liquid, and 0.5 parts of an initiator to obtain a mixed solution, add 50 wt% of the mixed solution to a reaction container, fill the reaction container with nitrogen, add 50 wt% of the initiator to the reaction container, stir and heat, after heating to 75°C, drop the remaining mixed solution into the reaction container, incubate for 4 h, cool and discharge to obtain an acrylate glue solution;

[0079] (2) adding isophorone diisocyanate curing agent and dibutyltin dilaurate catalyst in the acrylate adhesive solution, stirring, standing for a period of time to wait for the bubbles to disappear, stirring and ultrasonic dispersion, standing for a period of time to wait for the bubbles to disappear, obtaining the adhesive solution sample, laying the polyvinyl chloride film on the coating machine, coating the adhesive solution sample on the surface of the polyvinyl chloride film, placing the polyvinyl chloride film coated with the adhesive solution in the drying oven, drying at 70℃ for 5min, obtaining the PVC electrical tape.

[0080] Comparative Example 3, a high-viscosity tensile-resistant PVC electrical tape, comprising an acrylate adhesive solution and a polyvinyl chloride film coated with the acrylate adhesive solution, the preparation method of the PVC electrical tape comprising the following steps:

[0081] (1) mixing butyl acrylate 80 parts, benzyl methacrylate 20 parts, pentafluorobenzyl acrylate 15 parts, hydroxyethyl acrylate 2 parts, acrylic acid 2 parts, flame retardant 5 parts, ethyl acetate 100 parts, ionic liquid 15 parts, initiator 0.5 parts uniformly, obtaining the mixed solution, adding 50wt% of the mixed solution into the reaction container, filling nitrogen into the reaction container, adding 50wt% of the initiator into the reaction container, stirring and heating, heating to 75℃, then adding the remaining mixed solution into the reaction container dropwise, keeping warm for 4h, cooling and discharging, obtaining the acrylate adhesive solution;

[0082] (2) adding isophorone diisocyanate curing agent and dibutyltin dilaurate catalyst in the acrylate adhesive solution, stirring, standing for a period of time to wait for the bubbles to disappear, adding tributyl phosphate and aluminum hydroxide with a mass fraction ratio of 3:1, stirring and ultrasonic dispersion, standing for a period of time to wait for the bubbles to disappear, obtaining the adhesive solution sample, laying the polyvinyl chloride film on the coating machine, coating the adhesive solution sample on the surface of the polyvinyl chloride film, placing the polyvinyl chloride film coated with the adhesive solution in the drying oven, drying at 70℃ for 5min, obtaining the PVC electrical tape.

[0083] Performance test

[0084] Test 1 initial adhesion performance test: cutting the PVC electrical tapes prepared in Examples 1-6 and Comparative Examples 1-3 into samples with a size of 25mm×100mm, testing according to the method of national standard GB / T31125-2014, connecting the samples end to end into a ring shape, clamping the samples in the clamp, immediately separating in the opposite direction after the samples contact the test plate, recording the maximum force when separating;

[0085] Test 2 Adhesion performance test: the prepared PVC electrical tape of examples 1-6, comparative examples 1-3 was cut into 25mm x 100mm samples, and the test was performed according to the method of national standard GB / T4851-2014, the sample was pasted on the test plate, the upper and lower ends were aligned with the standard line, a 2 kg roller was used to press back and forth for 5 times, the test plate was hung vertically on the testing machine, a 1 kg weight was hung at the lower end, and the falling time was recorded;

[0086] Test 3 Peeling strength performance test: the prepared PVC electrical tape of examples 1-6, comparative examples 1-3 was cut into 25mm x 100mm samples, and the test was performed according to the method of national standard GB / T2792-2014, the sample was pasted on the test plate, a 2 kg roller was used to press back and forth for 5 times, and an AR-1000 adhesive release tester was used to test, and the average force during peeling was recorded.

[0087] Test 4 Heat resistance performance test: the prepared PVC electrical tape of examples 1-6, comparative examples 1-3 was cut into 50mm x 50mm samples, the sample was pasted on a stainless steel plate, a 2 kg roller was used to press back and forth for 5 times, and then placed in a 160℃ oven for 30 min, cooled to room temperature, and the PVC electrical tape was manually peeled off, and the residual glue of the PVC electrical tape was observed;

[0088] Test 5 Flame retardant performance test: the prepared PVC electrical tape of examples 1-6, comparative examples 1-3 was cut into 25mm x 100mm samples, and the test was performed according to the method of national standard GB / T15903-1995, and the burning length was recorded.

[0089] Table 1 Test results of sample mechanical performance test

[0090]

[0091] Table 2 Test results of sample heat resistance and flame retardant performance test

[0092]

[0093] Working principle: the benzene ring structure of benzyl methacrylate forms a hard segment in the copolymer, which improves the heat resistance of the glue solution, and other acrylic monomers constitute a soft segment, and the structure of soft and hard segments makes the copolymer have good adhesion and cohesion, and when the acrylic acid pentyl fluoride benzyl ester is copolymerized, the fluorine atom and the benzene ring introduce steric hindrance to prevent the segments from being tightly packed and entangled, and the adhesion is improved;

[0094] When preparing the acrylic ester glue solution, the core-shell microspheres flame retardant is introduced, and the tributyl phosphate and aluminum hydroxide are added during the curing of the acrylic ester glue solution to obtain a composite flame retardant glue solution, and the flame retardant material is used in polyvinyl chloride film in cooperation with ammonium polyphosphate, so as to further improve the flame retardant performance of the PVC electrical tape.

[0095] The ionic liquid introduces imidazole cation, forms stable structure in the acrylate copolymer, improves the impregnation and adhesion of the adhesive liquid to the adherend, and enhances the cohesive energy of the adhesive liquid by introducing the curing agent, so that the PVC electrician adhesive tape is not prone to peeling or residual when subjected to external force.

[0096] It will be obvious to a person skilled in the art that, without departing from the scope of the present application, the application can be implemented in other particular forms apparent to the person skilled in the art. In light of the foregoing description, the person skilled in the art will appreciate that the application is not limited to the details of the foregoing exemplary embodiment but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. Consequently, the embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and therefore all changes coming within the meaning and equivalency range of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A high viscosity, tensile resistant PVC electrical gaffer tape, characterized in that: The acrylic ester glue liquid and the polyvinyl chloride film coated with the acrylic ester glue liquid, the acrylic ester glue liquid comprises the following components by weight: butyl acrylate 40-80 parts, benzyl methacrylate 5-20 parts, pentafluorobenzyl acrylate 10-15 parts, hydroxyethyl acrylate 0.5-2 parts, acrylic acid 0.5-2 parts, flame retardant 5-10 parts, ethyl acetate 80-100 parts, ionic liquid 5-15 parts, initiator 0.1-0.5 parts; The flame retardant is prepared into a core-shell microsphere flame retardant with methyl phosphonic acid diethyl acrylate as a core layer monomer, triallyl isocyanate as a core layer crosslinking agent, and methyl methacrylate as a shell layer monomer; The ionic liquid is selected from one of 1-butyl-3-methyl imidazole bis-trifluoromethyl sulfonimide salt, 1-vinyl-3-butyl imidazole chloride salt, 1-butyl-3-methyl imidazole tetrafluoroborate salt, 1-ethyl-3-methyl imidazole acetate salt, and 1-butyl-3-methyl imidazole acetate salt; The preparation method of the acrylic ester glue liquid comprises the following steps: (1) uniformly mix butyl acrylate, benzyl methacrylate, pentafluorobenzyl acrylate, hydroxyethyl acrylate, acrylic acid, flame retardant, ionic liquid, ethyl acetate, and initiator to obtain a mixed solution; (2) add 50wt% of the mixed solution into a reaction container, fill nitrogen into the reaction container, add 50wt% of the initiator into the reaction container, stir and heat; (3) heat to 75℃, drop the remaining mixed solution and initiator into the reaction container in sequence, keep warm for 4h, cool and discharge to obtain the acrylic ester glue liquid.

2. A high viscosity, tensile resistant PVC electrical tape according to claim 1, characterized in that: The preparation method of the flame retardant comprises the following steps: Mix methyl phosphonic acid diethyl acrylate, sodium dodecyl sulfate, sodium p-styrene sulfonate, triallyl isocyanate, and deionized water to obtain a uniform pre-emulsion; Add 20wt% of the pre-emulsion into a reaction container, add sodium dodecyl sulfate, sodium p-styrene sulfonate, triallyl isocyanate, and deionized water, heat the reaction container to 80℃ and stir; Slowly drop the remaining pre-emulsion into the reaction container, keep warm for 2h, drop methyl methacrylate, keep warm for 4h, cool, wash, and dry the reaction product to obtain the flame retardant.

3. A high viscosity, tensile resistant PVC electrical tape according to claim 1, wherein: The polyvinyl chloride film comprises the following components by weight: PVC resin 100 parts, heat stabilizer 3 parts, plasticizer 40 parts, ammonium polyphosphate 15 parts, flame retardant material 5 parts, stearic acid 0.5 parts, and calcium stearate 0.5 parts.

4. A high viscosity, tensile resistant PVC electrical tape according to claim 3, wherein: The preparation method of the polyvinyl chloride film comprises the following steps: Pour the PVC resin, heat stabilizer, plasticizer, ammonium polyphosphate, flame retardant material, stearic acid, and calcium stearate into a high-speed mixer, uniformly mix to obtain a mixture; Pour the mixture into a mixing machine, mix at a temperature of 150℃ for 4-10min, pour the mixing product into a mold, heat press on a flat vulcanizing machine at 160℃ for 5min, cold press for 5min to obtain a PVC composite material; Preheat the roller cylinder of a calendering machine to 160-180℃, use the calendering machine to calender the PVC composite material, cool and cut the calendered film to obtain the polyvinyl chloride film.

5. A high viscosity, tensile resistant PVC electrical tape according to claim 1, wherein: The initiator is selected from azobisisobutyronitrile, dibenzoyl peroxide, methyl ethyl ketone peroxide, and azodicarbonamide.

6. A high viscosity, tensile resistant PVC electrical tape according to claim 3, wherein: The preparation method of the flame-retardant material comprises the following steps: The reaction container is filled with nitrogen, toluene is added into the reaction container, 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is dissolved in toluene, the reaction container is heated to 80 DEG C, and mechanical stirring device is used for stirring; Vinyl triethoxysilane and azobisisobutyronitrile are sequentially added into the reaction container, the reaction container is cooled to room temperature after 24 h of reaction, the reaction product is washed with deionized water, and the washed product is vacuum dried by using a vacuum drying box to obtain the flame-retardant material.

7. A high viscosity, tensile resistant PVC electrical tape according to claim 3, wherein: The heat stabilizer is selected from one of organic tin stabilizers, calcium-zinc stabilizers and rare earth stabilizers, and the plasticizer is selected from one of dioctyl phthalate, dioctyl adipate, dimethyl sebacate, triphenyl phosphate and trioctyl phosphate.

8. A process for the preparation of a high tack tensile PVC electrical tape suitable for use in a high tack tensile PVC electrical tape as claimed in any one of claims 1 to 7, characterised in that: The preparation method comprises the following steps: S1, isophorone diisocyanate curing agent is added into the acrylate glue solution, and dibutyltin dilaurate catalyst is added, stirring is carried out, and a period of time is waited for the disappearance of bubbles, mass fraction of tributyl phosphate and aluminum hydroxide is 3:1, stirring and ultrasonic dispersion are carried out, and a period of time is waited for the disappearance of bubbles to obtain the glue solution sample; S2, the polyvinyl chloride film is laid on the coating machine, the glue solution sample is coated on the surface of the polyvinyl chloride film, the polyvinyl chloride film coated with the glue solution is placed in the drying oven, and 70 DEG C drying is carried out for 5 min to obtain the PVC electrical tape.

9. A process for the preparation of a high viscosity, tensile resistant PVC electrical gum tape as claimed in claim 8, characterized in that: The preparation method further comprises the following steps: S21, the PVC electrical tape is trimmed, the PVC electrical tape is wound into a roll shape by using a winding machine, and the wound PVC electrical tape is packaged and stored.

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