High-adhesion roll-shaped high-temperature gummed paper and preparation method thereof

Abstract

The invention relates to the technical field of gummed paper, in particular to high-adhesion roll-shaped high-temperature gummed paper and a preparation method thereof. The high-adhesion roll-shaped high-temperature adhesive paper comprises first impregnated paper, second impregnated glass cloth attached to one side of the first impregnated paper, third impregnated paper attached to one side of the second impregnated glass cloth, fourth impregnated glass cloth attached to one side of the third impregnated paper and fifth impregnated paper attached to one side of the fourth impregnated glass cloth, and the protective film is adhered to the outer side of the fifth impregnated paper. The adhesive has the advantages of extremely high surface bonding strength, excellent electrical insulation performance and simple preparation method, and is suitable for large-scale popularization and application.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesive tapes, and in particular to a high-adhesion roll-shaped high-temperature adhesive tape and a preparation method thereof. Background Art

[0002] Adhesive tape is generally made of glass fiber and resin molded into a shape. After being hot-pressed, it can be attached to the surface of the material or bonded to each other. The production process of adhesive tape generally involves processes such as dipping, drying and cooling. The resin originally used for adhesive tape was thermosetting phenolic resin, but it is toxic and easily corroded by strong alkali. It is currently gradually being replaced by melamine formaldehyde resin.

[0003] The bonding strength and wear resistance of melamine resin are better than those of phenolic resin, and the color of the adhesive layer is light, which does not affect the decorative properties of the impregnated paper. The performance of the impregnated resin will directly affect the performance of the impregnated paper, and adding different additives to the impregnated resin can make the adhesive paper have excellent wear resistance, high temperature resistance, acid and alkali corrosion resistance and other properties.

[0004] At present, the adhesive tape obtained by resin impregnation has improved its environmental performance, sealed most of the formaldehyde released inside, and reduced the amount of formaldehyde dissipated in the air. However, its strength is low at high temperatures, especially its high moisture absorption strength, strong surface hydrophilicity, and poor dimensional stability, which urgently need to be solved. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a high-adhesion roll-shaped high-temperature adhesive tape and a preparation method thereof.

[0006] A high-adhesion roll of high-temperature adhesive tape comprises: a first impregnated paper, a second impregnated glass cloth attached to one side of the first impregnated paper, a third impregnated paper attached to one side of the second impregnated glass cloth, a fourth impregnated glass cloth attached to one side of the third impregnated paper, a fifth impregnated paper attached to one side of the fourth impregnated glass cloth, and a protective film attached to the outer side of the fifth impregnated paper.

[0007] Preferably, the first impregnated paper, the third impregnated paper and the fifth impregnated paper are all prepared by the following steps: adding polyethylene oxide to the silica precursor and stirring for 10-30 minutes, standing at 50-60°C for 5-10 hours, adding epoxy resin, fluorinated silane coupling agent, tert-butyl perbenzoate, and sodium dodecyl sulfonate and stirring for 10-30 minutes to obtain a base paper adhesive solution; immersing the base paper in the base paper adhesive solution, then adding glutaraldehyde and ultrasonically treating for 10-30 minutes, and standing at 90-100°C.

[0008] Preferably, the fluorine-containing silane coupling agent is heptadecafluorodecyltrimethoxysilane.

[0009] Preferably, the mass ratio of the silica precursor, polyethylene oxide, epoxy resin, fluorosilane coupling agent, tert-butyl peroxybenzoate, sodium dodecyl sulfonate, and glutaraldehyde is 5-10: 0.1-1: 5-15: 0.1-1: 0.01-0.1: 1-2: 0.01-0.1.

[0010] Preferably, the silica precursor is prepared by the following steps: adding tetraethyl orthosilicate to water, stirring evenly, adjusting the pH value of the system to 4-5, and performing ultrasonic treatment for 1-2 h.

[0011] Preferably, the sizing amount of the first impregnated paper, the third impregnated paper, and the fifth impregnated paper is 80-100 g / m 2 .

[0012] Preferably, the second impregnated glass cloth and the fourth impregnated glass cloth are both prepared by the following steps: stirring formaldehyde and water evenly, adjusting the pH value of the system to 8-9, adding melamine and propylene glycol thereto, stirring at 70-80 °C for 10-20 min, adding ethyl carbamate and continuing to stir for 1-2 h, adding waterborne polyurethane, leveling agent, and defoaming agent thereto, stirring at 40-60 °C for 1-2 h to obtain a glass cloth glue mucus; immersing an alkali-free glass cloth for electrical engineering into the glass cloth glue mucus, adding terminal amino polyamide-amine and performing ultrasonic treatment for 10-30 min, and standing at 90-100 °C.

[0013] Preferably, the mass ratio of formaldehyde, melamine, propylene glycol, ethyl carbamate, waterborne polyurethane, leveling agent, defoaming agent, and terminal amino polyamide-amine is 5-15: 5-15: 1-2: 1-2: 5-10: 1-2: 0.1-1: 0.01-0.1.

[0014] Preferably, the sizing amount of the second impregnated glass cloth and the fourth impregnated glass cloth is 80-100 g / m 2 .

[0015] The preparation method of the above high-adhesion roll-shaped high-temperature adhesive tape includes the following steps: sequentially arranging and laminating the first impregnated paper, the second impregnated glass cloth, the third impregnated paper, the fourth impregnated glass cloth, and the fifth impregnated paper, performing high-pressure vacuum rolling for 30-60 s, with a pressing pressure of 1-2.5 MPa, air drying, then covering a protective film on the surface, and winding.

[0016] Beneficial effects:

[0017] In the present invention, an alkali-free glass cloth for electrical engineering is impregnated into a glass cloth glue mucus, and the base paper is immersed into a base paper glue mucus, and then sequentially subjected to lamination and rolling, which can not only effectively prevent the warping of the adhesive tape, has good dimensional stability, is beneficial to transportation, but also has high bonding strength, and at the same time has stable electrical insulation performance, and is suitable for the production of multi-specification batch materials.

[0018] Silica precursor and polyethylene oxide are compounded in the base paper adhesive mucus. After the base paper is impregnated, it is cured with glutaraldehyde. With the cooperation of fluorosilane coupling agent, the adhesive paper not only has extremely high stability, excellent corrosion resistance and high temperature resistance, but also has excellent hydrophobic performance and good self-cleaning effect.

[0019] The surface gluing strength of the present invention is extremely high, and it also has excellent electrical insulation performance. The preparation method is simple and suitable for large-scale popularization and application. Brief Description of the Drawings

[0020] Figure 1 It is a comparison chart of the dimensional stability of the adhesive papers obtained in Example 5 and Comparative Examples 1-2.

[0021] Figure 2 It is a comparison chart of the surface gluing strength of the adhesive papers obtained in Example 5 and Comparative Examples 1-2.

[0022] Figure 3 It is a comparison chart of the water contact angle and resistance of the adhesive papers obtained in Example 5 and Comparative Examples 1-2 after thermal curing.

[0023] Figure 4 It is a thermogravimetric analysis curve of the adhesive papers obtained in Example 5 and Comparative Examples 1-2 after thermal curing. Detailed Embodiments

[0024] The present invention will be further explained below in conjunction with specific embodiments.

[0025] The epoxy resin used below is purchased from Langfang Nanze Anticorrosive Materials Co., Ltd., and the model is E44. The aqueous polyurethane used below is purchased from Anhui Femtosecond Chemical Co., Ltd., and the brand is FS-7. The leveling agent used below is purchased from Jining Fangyu Chemical Co., Ltd., and the model is BYK3700. The defoaming agent used below is purchased from Hebei Zhongchuang Biotechnology Co., Ltd.

[0026] The base paper used below is purchased from Guangxi Hezhou Hongxing Paper Co., Ltd. The non-alkali glass cloth for electrical engineering used below is purchased from Jiangyin Wanqian Chemicals Co., Ltd., and the model is EWR200 non-alkali cloth.

[0027] Example 1

[0028] A high-adhesion roll-shaped high-temperature adhesive paper, comprising: a first impregnated paper, a second impregnated glass cloth attached to one side of the first impregnated paper, a third impregnated paper attached to one side of the second impregnated glass cloth, a fourth impregnated glass cloth attached to one side of the third impregnated paper, a fifth impregnated paper attached to one side of the fourth impregnated glass cloth, and a PVC protective film attached to the outside of the fifth impregnated paper.

[0029] The first impregnated paper, the third impregnated paper, and the fifth impregnated paper are all prepared by the following steps: Add 10 g of polyethylene oxide to 500 g of silica precursor, stir at a speed of 1000 r / min for 10 min, let it stand at a temperature of 50 °C for 5 h, add 500 g of epoxy resin, 10 g of heptadecafluorodecyltrimethoxysilane, 1 g of tert-butyl peroxybenzoate, and 100 g of sodium dodecyl sulfonate, stir at a speed of 100 r / min for 10 min to obtain the original paper glue mucus; Immerse the original paper into the original paper glue mucus, add 1 g of glutaraldehyde and perform ultrasonic treatment for 10 min, the ultrasonic frequency is 4 kHz, and let it stand at a temperature of 90 °C.

[0030] The silica precursor is prepared by the following steps: Add 100 g of tetraethyl orthosilicate to 2000 g of deionized water and stir evenly, adjust the pH value of the system to 4 - 5 with 0.1 mol / L hydrochloric acid, perform ultrasonic treatment for 1 h, and the ultrasonic frequency is 5 kHz.

[0031] The second impregnated glass cloth and the fourth impregnated glass cloth are both prepared by the following steps: Stir 500 g of formaldehyde and 2000 g of water evenly, adjust the pH value of the system to 8 - 9 with 1 mol / L sodium hydroxide solution, add 500 g of melamine and 100 g of propylene glycol thereto, stir at a temperature of 70 °C for 10 min, add 100 g of ethyl carbamate and continue stirring for 1 h, add 500 g of waterborne polyurethane, 100 g of leveling agent, and 10 g of defoaming agent thereto, stir at a temperature of 40 °C for 1 h, and the stirring speed is 100 r / min to obtain the glass cloth glue mucus; Immerse 80 layers of non-alkali glass cloth for electrical engineering into the glass cloth glue mucus, add 10 g of terminal amino polyamide amine and perform ultrasonic treatment for 10 min, the ultrasonic frequency is 4 kHz, and let it stand at a temperature of 90 °C.

[0032] Among them, the sizing amount of the first impregnated paper, the third impregnated paper, and the fifth impregnated paper is 80 g / m 2 ; The sizing amount of the second impregnated glass cloth and the fourth impregnated glass cloth is 80 g / m 2 .

[0033] The preparation method of the above high-adhesion roll-shaped high-temperature adhesive tape includes the following steps: Arrange and stack the first impregnated paper, the second impregnated glass cloth, the third impregnated paper, the fourth impregnated glass cloth, and the fifth impregnated paper in sequence, place them in a high-pressure vacuum press and roll for 30 s, where the pressing pressure is 1 MPa, air dry, and then attach a layer of PVC protective film on the surface and wind it up.

[0034] Example 2

[0035] A high-adhesion roll-shaped high-temperature adhesive tape, comprising: a first impregnated paper, a second impregnated glass cloth attached to one side of the first impregnated paper, a third impregnated paper attached to one side of the second impregnated glass cloth, a fourth impregnated glass cloth attached to one side of the third impregnated paper, a fifth impregnated paper attached to one side of the fourth impregnated glass cloth, and a PVC protective film attached to the outside of the fifth impregnated paper.

[0036] The first impregnated paper, the third impregnated paper, and the fifth impregnated paper are all prepared by the following steps: Add 100 g of polyethylene oxide to 1000 g of silica precursor, stir at a speed of 2000 r / min for 30 min, let stand at a temperature of 60 °C for 10 h, add 1500 g of epoxy resin, 100 g of heptadecafluorodecyltrimethoxysilane, 10 g of tert-butyl peroxybenzoate, and 200 g of sodium dodecyl sulfonate, stir at a speed of 500 r / min for 30 min to obtain the original paper glue mucus; Immerse the original paper into the original paper glue mucus, add 10 g of glutaraldehyde and ultrasonically treat for 30 min, the ultrasonic frequency is 10 kHz, and let stand at a temperature of 100 °C.

[0037] The silica precursor is prepared by the following steps: Add 200 g of tetraethyl orthosilicate to 5000 g of deionized water and stir evenly, adjust the pH value of the system to 4-5 with 1 mol / L hydrochloric acid, and ultrasonically treat for 2 h, the ultrasonic frequency is 12 kHz.

[0038] The second impregnated glass cloth and the fourth impregnated glass cloth are both prepared by the following steps: Stir 1500 g of formaldehyde and 3000 g of water evenly, adjust the pH value of the system to 8-9 with a 2 mol / L sodium hydroxide solution, add 1500 g of melamine and 200 g of propylene glycol thereto, stir at a temperature of 80 °C for 20 min, add 200 g of ethyl carbamate and continue to stir for 2 h, add 1000 g of waterborne polyurethane, 200 g of leveling agent, and 100 g of defoaming agent thereto, stir at a temperature of 60 °C for 2 h, and the stirring speed is 500 r / min to obtain the glass cloth glue mucus; Immerse 200 layers of non-alkali glass cloth for electrical engineering into the glass cloth glue mucus, add 10 g of terminal amino polyamide-amine and ultrasonically treat for 30 min, the ultrasonic frequency is 10 kHz, and let stand at a temperature of 100 °C.

[0039] Among them, the sizing amount of the first impregnated paper, the third impregnated paper, and the fifth impregnated paper is 100 g / m 2 ; the sizing amount of the second impregnated glass cloth and the fourth impregnated glass cloth is 100 g / m 2 .

[0040] The preparation method of the above-mentioned high-adhesion roll-shaped high-temperature adhesive tape comprises the following steps: arranging and laminating the first impregnated paper, the second impregnated glass cloth, the third impregnated paper, the fourth impregnated glass cloth, and the fifth impregnated paper in sequence, placing them in a high-pressure vacuum press for rolling for 60 s, wherein the pressing pressure is 2.5 MPa, air-drying, then laminating a layer of PVC protective film on the surface, and winding.

[0041] Example 3

[0042] A high-adhesion roll-shaped high-temperature adhesive tape comprises: a first impregnated paper, a second impregnated glass cloth attached to one side of the first impregnated paper, a third impregnated paper attached to one side of the second impregnated glass cloth, a fourth impregnated glass cloth attached to one side of the third impregnated paper, a fifth impregnated paper attached to one side of the fourth impregnated glass cloth, and a PVC protective film attached to the outside of the fifth impregnated paper.

[0043] The first impregnated paper, the third impregnated paper, and the fifth impregnated paper are all prepared by the following steps: adding 80 g of polyethylene oxide to 700 g of silica precursor, stirring at a speed of 1200 r / min for 25 min, standing at a temperature of 52 °C for 9 h, adding 800 g of epoxy resin, 70 g of 1H,1H,2H,2H-perfluorodecyltrimethoxysilane, 2 g of tert-butyl peroxybenzoate, and 170 g of sodium dodecylsulfonate, stirring at a speed of 200 r / min for 25 min to obtain the original paper glue mucus; dipping the original paper into the original paper glue mucus, adding 3 g of glutaraldehyde thereto and performing ultrasonic treatment for 25 min, with the ultrasonic frequency being 6 kHz, and standing at a temperature of 98 °C.

[0044] The silica precursor is prepared by the following steps: adding 130 g of tetraethyl orthosilicate to 4000 g of deionized water and stirring evenly, adjusting the pH value of the system to 4 - 5 with 0.2 mol / L hydrochloric acid, and performing ultrasonic treatment for 100 min, with the ultrasonic frequency being 6 kHz.

[0045] The second impregnated glass cloth and the fourth impregnated glass cloth are both prepared by the following steps: stirring 1200 g of formaldehyde and 2200 g of water evenly, adjusting the pH value of the system to 8 - 9 with a 1.7 mol / L sodium hydroxide solution, adding 800 g of melamine and 170 g of propylene glycol thereto, stirring at a temperature of 73 °C for 18 min, adding 130 g of ethyl carbamate and continuing to stir for 100 min, adding 700 g of waterborne polyurethane, 170 g of leveling agent, and 30 g of defoaming agent thereto, stirring at a temperature of 55 °C for 80 min, with the stirring speed being 400 r / min, to obtain the glass cloth glue mucus; dipping 80 layers of alkali-free glass cloth for electrical engineering into the glass cloth glue mucus, adding 7 g of amino-terminated polyamide-amine thereto and performing ultrasonic treatment for 15 min, with the ultrasonic frequency being 9 kHz, and standing at a temperature of 92 °C.

[0046] Among them, the sizing amount of the first impregnated paper, the third impregnated paper, and the fifth impregnated paper is 95 g / m2 ; The sizing amount of the second impregnated glass cloth and the fourth impregnated glass cloth is 85 g / m 2 .

[0047] The preparation method of the above high-adhesion roll-shaped high-temperature adhesive tape includes the following steps: sequentially arranging and laminating the first impregnated paper, the second impregnated glass cloth, the third impregnated paper, the fourth impregnated glass cloth, and the fifth impregnated paper, placing them in a high-pressure vacuum press and rolling for 50 s, where the pressing pressure is 2 MPa, air-drying, and then laminating a PVC protective film on the surface and winding it up.

[0048] Example 4

[0049] A high-adhesion roll-shaped high-temperature adhesive tape includes: a first impregnated paper, a second impregnated glass cloth attached to one side of the first impregnated paper, a third impregnated paper attached to one side of the second impregnated glass cloth, a fourth impregnated glass cloth attached to one side of the third impregnated paper, a fifth impregnated paper attached to one side of the fourth impregnated glass cloth, and a PVC protective film attached to the outside of the fifth impregnated paper.

[0050] The first impregnated paper, the third impregnated paper, and the fifth impregnated paper are all prepared by the following steps: adding 20 g of polyethylene oxide to 900 g of silica precursor, stirring at a speed of 1800 r / min for 15 min, standing at a temperature of 58 °C for 7 h, adding 1200 g of epoxy resin, 30 g of heptadecafluorodecyltrimethoxysilane, 8 g of tert-butyl peroxybenzoate, and 130 g of sodium dodecylsulfonate, stirring at a speed of 400 r / min for 15 min to obtain the original paper glue mucus; immersing the original paper into the original paper glue mucus, adding 7 g of glutaraldehyde and performing ultrasonic treatment for 15 min, with the ultrasonic frequency of 9 kHz, and standing at a temperature of 92 °C.

[0051] The silica precursor is prepared by the following steps: adding 170 g of tetraethyl orthosilicate to 3000 g of deionized water and stirring evenly, adjusting the pH value of the system to 4 - 5 with 0.8 mol / L hydrochloric acid, and performing ultrasonic treatment for 80 min, with the ultrasonic frequency of 9 kHz.

[0052] Both the second impregnated glass cloth and the fourth impregnated glass cloth are prepared by the following steps: Stir 800 g of formaldehyde and 2,800 g of water evenly, adjust the pH value of the system to 8 - 9 with a sodium hydroxide solution with a concentration of 1.3 mol / L, add 1,200 g of melamine and 130 g of propylene glycol thereto, stir at a temperature of 77 °C for 12 min, add 170 g of ethyl carbamate and continue stirring for 80 min, add 900 g of waterborne polyurethane, 130 g of leveling agent, and 70 g of defoaming agent thereto, stir at a temperature of 45 °C for 100 min, and the stirring speed is 200 r / min to obtain a glass cloth glue mucus; Immerse 160 layers of alkali-free glass cloth for electrical engineering into the glass cloth glue mucus, then add 3 g of terminal amino polyamide amine and perform ultrasonic treatment for 25 min, the ultrasonic frequency is 6 kHz, and let it stand at a temperature of 98 °C.

[0053] Among them, the sizing amount of the first impregnated paper, the third impregnated paper, and the fifth impregnated paper is 85 g / m 2 ; The sizing amount of the second impregnated glass cloth and the fourth impregnated glass cloth is 95 g / m 2 .

[0054] The preparation method of the above high-adhesion roll-shaped high-temperature adhesive tape includes the following steps: Arrange and stack the first impregnated paper, the second impregnated glass cloth, the third impregnated paper, the fourth impregnated glass cloth, and the fifth impregnated paper in sequence, place them in a high-pressure vacuum press and roll them for 40 s, wherein the pressing pressure is 1.5 MPa, air-dry, and then attach a layer of PVC protective film on the surface and wind it up.

[0055] Example 5

[0056] A high-adhesion roll-shaped high-temperature adhesive tape includes: a first impregnated paper, a second impregnated glass cloth attached to one side of the first impregnated paper, a third impregnated paper attached to one side of the second impregnated glass cloth, a fourth impregnated glass cloth attached to one side of the third impregnated paper, a fifth impregnated paper attached to one side of the fourth impregnated glass cloth, and a PVC protective film attached to the outside of the fifth impregnated paper.

[0057] Both the first impregnated paper, the third impregnated paper, and the fifth impregnated paper are prepared by the following steps: Add 50 g of polyethylene oxide to 800 g of silica precursor, stir at a speed of 1,500 r / min for 20 min, let it stand at a temperature of 55 °C for 8 h, add 1,000 g of epoxy resin, 50 g of 1H,1H,2H,2H-perfluorodecyltrimethoxysilane, 50 g of tert-butyl peroxybenzoate, and 150 g of sodium dodecylsulfonate, stir at a speed of 300 r / min for 20 min to obtain a base paper glue mucus; Immerse the base paper into the base paper glue mucus, add 5 g of glutaraldehyde thereto and perform ultrasonic treatment for 20 min, the ultrasonic frequency is 7.5 kHz, and let it stand at a temperature of 95 °C.

[0058] The silica precursor is prepared by the following steps: Add 150 g of tetraethyl orthosilicate to 3500 g of deionized water and stir evenly. Adjust the pH value of the system to 4 - 5 with 0.5 mol / L hydrochloric acid, perform ultrasonic treatment for 90 min, and the ultrasonic frequency is 7.5 kHz.

[0059] The second impregnated glass cloth and the fourth impregnated glass cloth are both prepared by the following steps: Stir 1000 g of formaldehyde and 2500 g of water evenly. Adjust the pH value of the system to 8 - 9 with 1.5 mol / L sodium hydroxide solution. Add 1000 g of melamine and 150 g of propylene glycol to it, stir at 75 °C for 15 min, add 150 g of ethyl carbamate and continue to stir for 90 min. Add 800 g of waterborne polyurethane, 150 g of leveling agent, and 50 g of defoaming agent to it, stir at 50 °C for 90 min, and the stirring speed is 300 r / min to obtain the glass cloth glue mucus; Immerse 120 layers of non-alkali glass cloth for electrical engineering into the glass cloth glue mucus, then add 5 g of amino-terminated polyamide-amine and perform ultrasonic treatment for 20 min, the ultrasonic frequency is 7.5 kHz, and let it stand at 95 °C.

[0060] Among them, the sizing amount of the first impregnated paper, the third impregnated paper, and the fifth impregnated paper is 90 g / m 2 ; the sizing amount of the second impregnated glass cloth and the fourth impregnated glass cloth is 90 g / m 2 .

[0061] The preparation method of the above high-adhesion roll-shaped high-temperature adhesive tape includes the following steps: Arrange and stack the first impregnated paper, the second impregnated glass cloth, the third impregnated paper, the fourth impregnated glass cloth, and the fifth impregnated paper in sequence, place them in a high-pressure vacuum press and roll for 45 s, where the pressing pressure is 1.8 MPa, air dry, and then attach a layer of PVC protective film on the surface and wind it up.

[0062] Comparative Example 1

[0063] A high-adhesion roll-shaped high-temperature adhesive tape includes: a first impregnated paper, a second impregnated glass cloth attached to one side of the first impregnated paper, a third impregnated paper attached to one side of the second impregnated glass cloth, a fourth impregnated glass cloth attached to one side of the third impregnated paper, a fifth impregnated paper attached to one side of the fourth impregnated glass cloth, and a PVC protective film attached to the outside of the fifth impregnated paper.

[0064] The first impregnated paper, the third impregnated paper, and the fifth impregnated paper are all prepared by the following steps: Add 50 g of polyethylene oxide to 800 g of silica precursor, stir at a speed of 1500 r / min for 20 min, let it stand at a temperature of 55 °C for 8 h, add 1000 g of epoxy resin, 50 g of heptadecafluorodecyltrimethoxysilane, 50 g of tert-butyl peroxybenzoate, and 150 g of sodium dodecyl sulfonate, stir at a speed of 300 r / min for 20 min to obtain the original paper glue mucus; Immerse the original paper into the original paper glue mucus, add 5 g of glutaraldehyde and ultrasonically treat for 20 min, the ultrasonic frequency is 7.5 kHz, and let it stand at a temperature of 95 °C.

[0065] The silica precursor is prepared by the following steps: Add 150 g of tetraethyl orthosilicate to 3500 g of deionized water and stir evenly, adjust the pH value of the system to 4 - 5 with 0.5 mol / L hydrochloric acid, and ultrasonically treat for 90 min, the ultrasonic frequency is 7.5 kHz.

[0066] The second impregnated glass cloth and the fourth impregnated glass cloth are both prepared by the following steps: Stir 1000 g of formaldehyde and 2500 g of water evenly, adjust the pH value of the system to 8 - 9 with 1.5 mol / L sodium hydroxide solution, add 1000 g of melamine and 150 g of propylene glycol thereto, stir at a temperature of 75 °C for 15 min, add 150 g of ethyl carbamate and continue to stir for 90 min, add 800 g of waterborne polyurethane, 150 g of leveling agent, and 50 g of defoaming agent thereto, stir at a temperature of 50 °C for 90 min, and the stirring speed is 300 r / min to obtain the glass cloth glue mucus; Immerse 120 layers of non-alkali glass cloth for electrical engineering into the glass cloth glue mucus, add 5 g of triethanolamine and ultrasonically treat for 20 min, the ultrasonic frequency is 7.5 kHz, and let it stand at a temperature of 95 °C.

[0067] Among them, the sizing amount of the first impregnated paper, the third impregnated paper, and the fifth impregnated paper is 90 g / m 2 ; The sizing amount of the second impregnated glass cloth and the fourth impregnated glass cloth is 90 g / m 2 .

[0068] The preparation method of the above high-adhesion roll-shaped high-temperature adhesive tape includes the following steps: Arrange and stack the first impregnated paper, the second impregnated glass cloth, the third impregnated paper, the fourth impregnated glass cloth, and the fifth impregnated paper in sequence, place them in a high-pressure vacuum press and roll for 45 s, wherein the pressing pressure is 1.8 MPa, air-dry, and then attach a layer of PVC protective film on the surface and wind it up.

[0069] Comparative Example 2

[0070] A high-adhesion roll-shaped high-temperature adhesive tape, comprising: a first impregnated paper, a second impregnated glass cloth attached to one side of the first impregnated paper, a third impregnated paper attached to one side of the second impregnated glass cloth, a fourth impregnated glass cloth attached to one side of the third impregnated paper, a fifth impregnated paper attached to one side of the fourth impregnated glass cloth, and a PVC protective film attached to the outside of the fifth impregnated paper.

[0071] The first impregnated paper, the third impregnated paper, and the fifth impregnated paper are all prepared by the following steps: Add 50 g of polyethylene oxide to 800 g of silica precursor, stir at a speed of 1500 r / min for 20 min, stand at a temperature of 55 °C for 8 h, add 1000 g of epoxy resin, 50 g of γ-aminopropyltriethoxysilane, 50 g of tert-butyl peroxybenzoate, and 150 g of sodium dodecyl sulfonate, stir at a speed of 300 r / min for 20 min to obtain the original paper glue mucus; Immerse the original paper into the original paper glue mucus, add 5 g of glutaraldehyde and ultrasonically treat for 20 min, the ultrasonic frequency is 7.5 kHz, and stand at a temperature of 95 °C.

[0072] The silica precursor is prepared by the following steps: Add 150 g of tetraethyl orthosilicate to 3500 g of deionized water and stir evenly, adjust the pH value of the system to 4-5 with 0.5 mol / L hydrochloric acid, and ultrasonically treat for 90 min, the ultrasonic frequency is 7.5 kHz.

[0073] The second impregnated glass cloth and the fourth impregnated glass cloth are both prepared by the following steps: Stir 1000 g of formaldehyde and 2500 g of water evenly, adjust the pH value of the system to 8-9 with 1.5 mol / L sodium hydroxide solution, add 1000 g of melamine and 150 g of propylene glycol thereto, stir at a temperature of 75 °C for 15 min, add 150 g of ethyl carbamate and continue to stir for 90 min, add 800 g of waterborne polyurethane, 150 g of leveling agent, and 50 g of defoaming agent thereto, stir at a temperature of 50 °C for 90 min, and the stirring speed is 300 r / min to obtain the glass cloth glue mucus; Immerse 120 layers of non-alkali glass cloth for electrical engineering into the glass cloth glue mucus, add 5 g of terminal amino polyamide-amine and ultrasonically treat for 20 min, the ultrasonic frequency is 7.5 kHz, and stand at a temperature of 95 °C.

[0074] Among them, the sizing amount of the first impregnated paper, the third impregnated paper, and the fifth impregnated paper is 90 g / m 2 ; The sizing amount of the second impregnated glass cloth and the fourth impregnated glass cloth is 90 g / m 2 .

[0075] The preparation method of the above-mentioned high-adhesion roll-shaped high-temperature adhesive tape includes the following steps: sequentially arrange and stack the first impregnated paper, the second impregnated glass cloth, the third impregnated paper, the fourth impregnated glass cloth, and the fifth impregnated paper, place them in a high-pressure vacuum press and roll for 45 s, where the pressing pressure is 1.8 MPa, air-dry, then attach a layer of PVC protective film on the surface, and wind up.

[0076] The adhesive tapes obtained in Example 5 and Comparative Examples 1-2 were subjected to a dimensional stability test, which is specifically as follows:

[0077] (1) Balance the test specimens: Place the test specimens in a constant temperature and humidity chamber for 72 h, maintaining the temperature at 23 ± 2 °C and the relative humidity at 50 ± 5%;

[0078] (2) Take out the test specimens and complete the measurement of the specimen length within 5 min, noting that the specimens are kept straight, accurate to 0.02 mm;

[0079] (3) At a position 10 cm from each side, use a steel ruler to measure the midpoint positions of the four sides and mark them;

[0080] (4) Measure the distances between the midpoints of the longitudinal and transverse opposite sides of each group of test specimens passing through the center point respectively, accurate to 0.02 mm;

[0081] (5) Put the test specimens into a blast drying oven for 24 h for a dry heat test: set the temperature at 70 ± 2 °C; then immediately take out the test specimens and place them in a desiccator for moisture-proofing for 1 h, and measure the length at the measurement positions in the previous step again;

[0082] (7) Then take the test specimens after balance treatment for a high humidity test: put them into a constant temperature and humidity chamber, take them out after standing for 96 h, maintain the temperature at 40 ± 2 °C and the relative humidity at 90-95%. Then use a clean degreased gauze to absorb the moisture on the surface of the test specimens, and measure the length at the measurement positions in the previous step again;

[0083] (8) Calculate the length change rate of the test specimens after the dry heat or high humidity test according to the formula.

[0084] As Figure 1 shown, the dimensional change rates of the adhesive tapes obtained in Example 5 are all the smallest, that is, the dimensional stability of the adhesive tapes obtained in Example 5 is the highest.

[0085] The adhesive tapes obtained in Example 5 and Comparative Examples 1-2 were hot-pressed on the surface of a plywood substrate at a hot-pressing temperature of 175 °C, a hot-pressing pressure of 1 MPa, and a hot-pressing time of 30 s. Refer to GB / T 34722-2017 "Decorative plywood and blockboard with impregnated film paper" to determine the surface bonding strength of the above-mentioned test specimens.

[0086] As Figure 2As shown, the surface gluing strength of the adhesive tape obtained in Example 5 is the highest, superior to Comparative Examples 1-2 (P < 0.05).

[0087] The adhesive tapes obtained in Example 5 and Comparative Examples 1-2 were placed between two steel plates for hot pressing. The hot pressing temperature was 175 °C, the hot pressing pressure was 1 MPa, and the hot pressing time was 30 s. Water was dropped onto the surface of the hot-cured adhesive board, and its water contact angle was measured using a contact angle detector. Subsequently, the resistance of the hot-cured adhesive board was measured.

[0088] As Figure 3 shown, after the adhesive tape obtained in Example 5 was hot-cured, both its water contact angle and resistance were the highest, superior to Comparative Examples 1-2 (P < 0.05).

[0089] The above-mentioned hot-cured adhesive board was ground into powder for thermogravimetric analysis. As Figure 4 shown, after the adhesive tape obtained in Example 5 was hot-cured, its thermal stability was the best, superior to Comparative Examples 1-2 (P < 0.05).

[0090] The applicant believes that the reason for the above results is as follows: In the present invention, an alkali-free glass cloth for electrical engineering is impregnated in a glass cloth adhesive mucus, and the base paper is immersed in a base paper adhesive mucus, and then successively subjected to lamination and rolling. This can not only effectively prevent the warping of the adhesive tape, has good dimensional stability, is conducive to transportation, but also has high gluing strength, and at the same time has stable electrical insulation performance and is suitable for the production of multi-specification batch materials. In the base paper adhesive mucus, a silica precursor and polyethylene oxide are compounded. After the base paper is impregnated, it is cured with glutaraldehyde. With the cooperation of a fluorosilane coupling agent, the adhesive tape not only has extremely high stability, excellent corrosion resistance and high temperature resistance, but also has excellent hydrophobic properties and good self-cleaning effect.

[0091] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A high-adhesion roll-shaped high-temperature adhesive tape, characterized in that: include: A first impregnated paper, a second impregnated glass cloth attached to one side of the first impregnated paper, a third impregnated paper attached to one side of the second impregnated glass cloth, a fourth impregnated glass cloth attached to one side of the third impregnated paper, a fifth impregnated paper attached to one side of the fourth impregnated glass cloth, and a protective film attached to the outer side of the fifth impregnated paper.

2. The high-adhesion roll-shaped high-temperature adhesive tape according to claim 1, characterized in that: The first impregnated paper, the third impregnated paper and the fifth impregnated paper are all prepared by the following steps: adding polyethylene oxide to the silica precursor and stirring for 10-30 minutes, standing at 50-60°C for 5-10 hours, adding epoxy resin, fluorinated silane coupling agent, tert-butyl perbenzoate and sodium dodecyl sulfonate and stirring for 10-30 minutes to obtain base paper adhesive solution; immersing the base paper in the base paper adhesive solution, then adding glutaraldehyde and ultrasonically treating for 10-30 minutes, and standing at 90-100°C.

3. The high-adhesion roll-shaped high-temperature adhesive tape according to claim 2, characterized in that: The fluorine-containing silane coupling agent is heptadecafluorodecyltrimethoxysilane.

4. The high-adhesion roll-shaped high-temperature adhesive tape according to claim 2, characterized in that: The mass ratio of silica precursor, polyethylene oxide, epoxy resin, fluorinated silane coupling agent, tert-butyl perbenzoate, sodium dodecyl sulfonate and glutaraldehyde is 5-10: 0.1-1：5-15：0.1-1：0.01-0.1：1-2：0.01-0.1。 5. The high-adhesion high-temperature adhesive tape in roll form according to claim 2, characterized in that: The silicon dioxide precursor is prepared by the following steps: adding ethyl orthosilicate into water and stirring evenly, adjusting the pH value of the system to 4-5, and ultrasonically treating for 1-2 hours.

6. The high-adhesion high-temperature adhesive tape in roll form according to claim 2, characterized in that: The glue amount of the first impregnated paper, the third impregnated paper and the fifth impregnated paper is 80-100g / m 2 .

7. The high-adhesion high-temperature adhesive tape in roll form according to claim 1, characterized in that: The second impregnated glass cloth and the fourth impregnated glass cloth are prepared by the following steps: formaldehyde and water are stirred evenly, the pH value of the system is adjusted to 8-9, melamine and propylene glycol are added thereto, and the mixture is stirred at 70-80°C for 10-20 minutes, ethyl formate is added thereto and the mixture is stirred for 1-2 hours, water-based polyurethane, leveling agent and defoaming agent are added thereto, and the mixture is stirred at 40-60°C for 1-2 hours to obtain glass cloth adhesive liquid; alkali-free glass cloth for electrical use is immersed in the glass cloth adhesive liquid, amino-terminated polyamide amine is added thereto, and the mixture is ultrasonically treated for 10-30 minutes, and the mixture is allowed to stand at 90-100°C.

8. The high-adhesion high-temperature adhesive tape in roll form according to claim 7, characterized in that: The mass ratio of formaldehyde, melamine, propylene glycol, ethyl formate, water-based polyurethane, leveling agent, defoaming agent and amino-terminated polyamide amine is 5-15:5-15:1-2:1-2:5-10:1-2:0.1-1:0.01-0.

1.

9. The high-adhesion high-temperature adhesive tape in roll form according to claim 7, characterized in that: The glue amount of the second impregnated glass cloth and the fourth impregnated glass cloth is 80-100g / m 2 .

10. A method for preparing the high-adhesion roll-shaped high-temperature adhesive tape according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: sequentially arranging and stacking the first impregnated paper, the second impregnated glass cloth, the third impregnated paper, the fourth impregnated glass cloth and the fifth impregnated paper, high-pressure vacuum rolling for 30-60 seconds with a pressing pressure of 1-2.5 MPa, air drying, and then pasting a protective film on the surface and rolling up.

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