Heat-resistant laminating tape for cotton coating and preparation method thereof

Abstract

The invention discloses a heat-resistant bonding tape for cotton coating and a preparation method thereof. After uniformly mixing a polyacrylic acid emulsion and a modified additive, the mixture is coated on both sides of a PET base film. After heat preservation treatment, the two sides are covered with release paper to prepare the heat-resistant bonding tape for cotton coating. Acrylic acid and acrylonitrile monomers are added to the bonding tape. The carboxyl group on the acrylic acid and the cyano group on the acrylonitrile are polar groups, which can increase the polarity and reactivity of polyacrylate, thereby improving the force with the bonding substrate. The modified monomer contains a double bond which can participate in the polymerization of the monomer, so that the polyacrylate molecule contains a cage-type silsesquioxane structure and a large number of benzene rings, which can improve the water resistance of the bonding part. The modified additive molecule contains an epoxy group which can react with the carboxyl group of the side chain of the polyacrylate molecule to further cross-link. The introduction of the organosilicon structure and the increase of the cross-linking sites ensure that the adhesion of the tape will not be significantly reduced as the temperature rises.

Description

Technical Field

[0001] The invention relates to the technical field of adhesive tape preparation, and in particular to a heat-resistant bonding adhesive tape for cotton coating and a preparation method thereof. Background Art

[0002] Cotton is one of the most important crops in the world. It has a large yield and low production cost, making cotton products relatively cheap. Cotton can be made into fabrics of various specifications. Cotton fabrics are strong and wear-resistant, and can be washed and ironed at high temperatures. The main and by-products of cotton have high utilization value. It is not only the most important fiber crop, but also an important oil crop, a high-protein food crop, and a textile and chemical raw material and an important strategic material. With the development of agriculture, agricultural machinery has also been continuously innovated. Some cotton storage machines have appeared on the market. In order to facilitate the transportation of cotton, these cotton storage machines need to pack a large amount of cotton into a cylindrical shape and pack it with a film, and finally bond it with tape. At this stage, the commonly used tape is acrylic pressure-sensitive adhesive, which is greatly affected by temperature and eroded by moisture in the air for a long time, and the bonding ability will be significantly reduced, affecting the preservation of cotton. Summary of the invention

[0003] The purpose of the present invention is to provide a heat-resistant bonding tape for cotton coating and a preparation method thereof, which solves the problem that the heat-resistant effect of the tape is poor and the tape will debond under the action of moisture in the air.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A method for preparing a heat-resistant laminating tape for cotton coating comprises the following steps:

[0006] Step A1: isooctyl acrylate, methyl methacrylate, acrylic acid, acrylonitrile, modified monomer, sodium dodecylbenzene sulfonate and tetrahydrofuran are uniformly mixed, and ammonium persulfate is added under stirring at a speed of 120-150 r / min and a temperature of 75-80° C. to react for 2-3 hours to obtain a polyacrylic acid emulsion;

[0007] Step A2: After the polyacrylic acid emulsion and the modified additive are evenly mixed, they are coated on both sides of the PET base film, and the temperature is kept at 20-25°C for 20-30 minutes, the temperature is increased to 80-90°C, and the temperature is kept for 1-1.5 hours, the temperature is increased to 110-120°C, and the temperature is kept for 1-1.5 hours, and then the release paper is covered on both sides to prepare a heat-resistant bonding tape for cotton packaging.

[0008] Furthermore, the amount ratio of isooctyl acrylate, methyl methacrylate, acrylic acid, acrylonitrile, modified monomer, sodium dodecylbenzene sulfonate and tetrahydrofuran described in step A1 is 65g:10g:15g:2g:10g:5g:150mL, and the amount of ammonium persulfate is 1% of the total mass of isooctyl acrylate, methyl methacrylate, acrylic acid and acrylonitrile.

[0009] Furthermore, the amount of the modifying additive described in step A2 is 2-8‰ of the mass of the polyacrylate emulsion.

[0010] Further, the modified monomer is prepared by the following steps:

[0011] B1: Phenyltrimethoxysilane, isopropanol, sodium hydroxide and deionized water are mixed evenly, and reacted for 10-15 hours at a speed of 120-150r / min and a temperature of 90-95°C to obtain sodium octaphenylcyclotetrasiloxane tetrasilanolate. Octaphenylcyclotetrasiloxane, triethylamine and tetrahydrofuran are mixed evenly, and nitrogen is introduced for protection. Methyldichlorosilane is added under stirring at a speed of 200-300r / min and a temperature of 0°C. After reacting for 4-5 hours, the temperature is raised to 20-25°C and the reaction is continued for 20-24 hours to obtain dihydrogen cage-type silsesquioxane;

[0012] Step B2: Evenly mix dihydrogen cage silsesquioxane, castor oil, Custer catalyst and toluene, introduce nitrogen protection, react for 10-15 hours at a speed of 150-200 r / min and a temperature of 80-85° C. to obtain modified cage silsesquioxane; evenly mix modified cage silsesquioxane, 3-isocyanate propyltrimethoxysilane, dibutyltin dilaurate and DMF, introduce nitrogen protection, react for 8-10 hours at a speed of 120-150 r / min and a temperature of 70-80° C. to obtain a modified monomer.

[0013] Furthermore, the amount ratio of phenyltrimethoxysilane, isopropanol, sodium hydroxide and deionized water in step B1 is 4mmol:4mL:2mmol:1mmol, and the amount ratio of octaphenylcyclotetrasiloxane, triethylamine, tetrahydrofuran and methyldichlorosilane is 12g:4mL:30mL:3.5g.

[0014] Further, the molar ratio of the dihydrogen cage silsesquioxane and castor oil described in step B2 is n:n+1, where n is a natural number greater than 0, the amount of the Custer catalyst is 1‰ of the mass of castor oil, the molar ratio of the hydroxyl group on the modified cage silsesquioxane and 3-isocyanate propyltrimethoxysilane is 1:1, and the amount of dibutyltin dilaurate is 2% of the mass of 3-isocyanate propyltrimethoxysilane.

[0015] Further, the modified additive is prepared by the following steps:

[0016] Step C1: 2-butene-1,4-diol, epichlorohydrin, boron trifluoride etherate and DMF are mixed evenly, reacted for 3-5 hours at a rotation speed of 150-200 r / min and a temperature of 65-70° C., and then sodium hydroxide solution is added, the temperature is raised to 75-80° C., and the reaction is carried out for 3-5 hours to obtain a modifier. Tetramethyldisiloxane, the modifier, chloroplatinic acid and DMF are mixed evenly, and reacted for 5-7 hours at a rotation speed of 120-150 r / min and a temperature of 60-70° C. to obtain a capping agent.

[0017] Step C2: Tetramethylcyclotetrasiloxane, octamethylcyclotetrasiloxane, tetramethylammonium hydroxide, a capping agent and dimethyl sulfoxide are mixed uniformly, nitrogen is introduced for protection, and the reaction is carried out for 3-5 hours at a speed of 120-150 r / min and a temperature of 105-110° C. to obtain a modified polysiloxane; the modified polysiloxane, KH570, chloroplatinic acid and DMF are mixed uniformly, nitrogen is introduced for protection, and the reaction is carried out for 8-10 hours at a speed of 200-300 r / min and a temperature of 70-80° C. to obtain a modified additive.

[0018] Furthermore, the dosage ratio of 2-butene-1,4-diol, epichlorohydrin, boron trifluoride etherate and sodium hydroxide solution described in step C1 is 35mmol:35mmol:1g:5mL, the mass fraction of sodium hydroxide solution is 20%, the molar ratio of tetramethyldisiloxane and modifier is 1:2, and the dosage of chloroplatinic acid is 1‰ of the mass of tetramethyldisiloxane.

[0019] Furthermore, the molar ratio of tetramethylcyclotetrasiloxane, octamethylcyclotetrasiloxane, tetramethylammonium hydroxide and the capping agent in step C2 is 1:1.4:3:2, the molar ratio of Si-H bonds on the modified polysiloxane and KH570 is 1:1, and the amount of chloroplatinic acid used is 2‰ of the mass of KH570.

[0020] Beneficial effects of the present invention: The heat-resistant adhesive tape for cotton coating prepared by the present invention is prepared by mixing isooctyl acrylate, methyl methacrylate, acrylic acid, acrylonitrile, modified monomer, sodium dodecylbenzene sulfonate, ammonium persulfate and tetrahydrofuran to obtain a polyacrylic acid emulsion, and the polyacrylic acid emulsion and the modified additive are evenly mixed, coated on both sides of a PET base film, and then covered with release paper to obtain a heat-resistant adhesive tape for cotton coating, and the modified monomer is hydrolyzed and polycondensed with phenyltrimethoxysilane as a raw material to obtain sodium octaphenylcyclotetrasiloxane tetrasilanolate, and sodium octaphenylcyclotetrasiloxane tetrasilanolate and dichlorosilane are reacted. , the sodium silanol on the sodium tetrasilanol of octaphenylcyclotetrasiloxane reacts with the chlorine atom site on the dichlorosilane to obtain a dihydrogen cage silsesquioxane, the dihydrogen cage silsesquioxane reacts with castor oil, the Si-H bond on the dihydrogen cage silsesquioxane reacts with the double bond on the castor oil, and then the double bond is capped by controlling the amount to obtain a modified cage silsesquioxane, the modified cage silsesquioxane reacts with 3-isocyanate propyltrimethoxysilane, the hydroxyl group on the modified cage silsesquioxane reacts with the isocyanate group on the 3-isocyanate propyltrimethoxysilane to obtain a modified monomer.

[0021] The modified additive uses 2-butene-1,4-diol and epichlorohydrin as raw materials, so that the hydroxyl group on the 2-butene-1,4-butanediol reacts with the epoxy group on the epichlorohydrin, and then closes the ring to form a new epoxy group under the action of a sodium hydroxide solution to obtain a modifier, the modifier reacts with tetramethyldisiloxane, so that the double bond on the modifier reacts with the Si-H bond on the tetramethyldisiloxane to obtain a capping agent, tetramethylcyclotetrasiloxane and octamethoxycyclotetrasiloxane are ring-opened, and then polymerized with the capping agent to obtain a modified polysiloxane, and the modified polysiloxane reacts with KH570, so that the Si-H bond on the modified polysiloxane reacts with the double bond of KH570 to obtain a modified additive.

[0022] Acrylic acid and acrylonitrile monomers are added to the bonding tape. The carboxyl group on acrylic acid and the cyano group on acrylonitrile are both polar groups, which can increase the polarity and reactivity of polyacrylate, thereby improving the interaction force with the bonding substrate. The double bond contained in the modified monomer can participate in the monomer polymerization, so that the polyacrylate molecule contains a cage-type silsesquioxane structure and a large number of benzene rings, which can improve the water resistance of the bonding part. The modified additive molecule contains an epoxy group, which can react with the carboxyl group of the side chain of the polyacrylate molecule to further cross-link. During the storage process after bonding, under the action of moisture in the air, the siloxane in the modified additive molecule and the polyacrylate molecule will undergo hydrolysis and condensation, and part of the siloxane hydrolysis will combine with the hydroxyl group on the surface of the bonding substrate, thereby increasing the adhesion of the tape. At the same time, the introduction of the silicone structure and the increase of the cross-linking sites ensure that the adhesion of the tape will not be significantly reduced as the temperature rises. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Embodiment 1: A method for preparing a heat-resistant laminating tape for cotton coating, comprising the following steps:

[0025] Step A1: isooctyl acrylate, methyl methacrylate, acrylic acid, acrylonitrile, modified monomer, sodium dodecylbenzene sulfonate and tetrahydrofuran are mixed uniformly, stirred at a speed of 120 r / min and a temperature of 75° C., and ammonium persulfate is added to react for 2 hours to obtain a polyacrylic acid emulsion;

[0026] Step A2: After the polyacrylic acid emulsion and the modified additive are evenly mixed, they are coated on both sides of the PET base film, and the temperature is kept at 20°C for 20 minutes, the temperature is increased to 80°C, and the temperature is kept for 1 hour, and the temperature is increased to 110°C. After the temperature is kept for 1 hour, release paper is covered on both sides to prepare a heat-resistant bonding tape for cotton packaging.

[0027] The amount ratio of isooctyl acrylate, methyl methacrylate, acrylic acid, acrylonitrile, modified monomer, sodium dodecylbenzene sulfonate and tetrahydrofuran described in step A1 is 65g:10g:15g:2g:10g:5g:150mL, and the amount of ammonium persulfate is 1% of the total mass of isooctyl acrylate, methyl methacrylate, acrylic acid and acrylonitrile.

[0028] The amount of the modifying additive described in step A2 is 2‰ of the mass of the polyacrylate emulsion.

[0029] The modified monomer is prepared by the following steps:

[0030] B1: Phenyltrimethoxysilane, isopropanol, sodium hydroxide and deionized water were mixed evenly, and reacted at a speed of 120 r / min and a temperature of 90°C for 10 hours to obtain sodium octaphenylcyclotetrasiloxane tetrasilanolate. Octaphenylcyclotetrasiloxane, triethylamine and tetrahydrofuran were mixed evenly, nitrogen was introduced for protection, and methyldichlorosilane was added under stirring at a speed of 200 r / min and a temperature of 0°C. After reacting for 4 hours, the temperature was raised to 20°C and the reaction was continued for 20 hours to obtain dihydrogen cage-type silsesquioxane;

[0031] Step B2: Dihydrogen cage silsesquioxane, castor oil, Custer catalyst and toluene are mixed evenly, nitrogen is introduced for protection, and the reaction is carried out for 10 hours at a speed of 150 r / min and a temperature of 80° C. to obtain modified cage silsesquioxane. Modified cage silsesquioxane, 3-isocyanate propyltrimethoxysilane, dibutyltin dilaurate and DMF are mixed evenly, nitrogen is introduced for protection, and the reaction is carried out for 8 hours at a speed of 120 r / min and a temperature of 70° C. to obtain a modified monomer.

[0032] The amount ratio of phenyltrimethoxysilane, isopropanol, sodium hydroxide and deionized water described in step B1 is 4mmol:4mL:2mmol:1mmol, and the amount ratio of octaphenylcyclotetrasiloxane, triethylamine, tetrahydrofuran and methyldichlorosilane is 12g:4mL:30mL:3.5g.

[0033] The molar ratio of the dihydrogen cage silsesquioxane and castor oil described in step B2 is 1:2, the amount of the Custer catalyst is 1‰ of the mass of castor oil, the molar ratio of the hydroxyl group on the modified cage silsesquioxane and 3-isocyanate propyltrimethoxysilane is 1:1, and the amount of dibutyltin dilaurate is 2% of the mass of 3-isocyanate propyltrimethoxysilane.

[0034] The modified additive is prepared by the following steps:

[0035] Step C1: 2-butene-1,4-diol, epichlorohydrin, boron trifluoride etherate and DMF are mixed evenly, reacted at a speed of 150 r / min and a temperature of 65° C. for 3 hours, and then sodium hydroxide solution is added, the temperature is raised to 75° C., and the reaction is carried out for 3 hours to obtain a modifier. Tetramethyldisiloxane, the modifier, chloroplatinic acid and DMF are mixed evenly, and reacted at a speed of 120 r / min and a temperature of 60° C. for 5 hours to obtain a capping agent.

[0036] Step C2: Tetramethylcyclotetrasiloxane, octamethylcyclotetrasiloxane, tetramethylammonium hydroxide, a capping agent and dimethyl sulfoxide are mixed evenly, nitrogen is introduced for protection, and the reaction is carried out for 3 hours at a speed of 120 r / min and a temperature of 105° C. to obtain a modified polysiloxane; the modified polysiloxane, KH570, chloroplatinic acid and DMF are mixed evenly, nitrogen is introduced for protection, and the reaction is carried out for 8 hours at a speed of 200 r / min and a temperature of 70° C. to obtain a modified additive.

[0037] The amount ratio of 2-butene-1,4-diol, epichlorohydrin, boron trifluoride etherate and sodium hydroxide solution described in step C1 is 35mmol:35mmol:1g:5mL, the mass fraction of sodium hydroxide solution is 20%, the molar ratio of tetramethyldisiloxane and modifier is 1:2, and the amount of chloroplatinic acid is 1‰ of the mass of tetramethyldisiloxane.

[0038] The molar ratio of tetramethylcyclotetrasiloxane, octamethylcyclotetrasiloxane, tetramethylammonium hydroxide and capping agent in step C2 is 1:1.4:3:2, the molar ratio of Si-H bonds on the modified polysiloxane and KH570 is 1:1, and the amount of chloroplatinic acid used is 2‰ of the mass of KH570.

[0039] Embodiment 2: A method for preparing a heat-resistant laminating tape for cotton coating, comprising the following steps:

[0040] Step A1: isooctyl acrylate, methyl methacrylate, acrylic acid, acrylonitrile, modified monomer, sodium dodecylbenzene sulfonate and tetrahydrofuran are uniformly mixed, and ammonium persulfate is added under stirring at a speed of 120 r / min and a temperature of 78° C. to react for 3 hours to obtain a polyacrylic acid emulsion;

[0041] Step A2: After the polyacrylic acid emulsion and the modified additive are evenly mixed, they are coated on both sides of the PET base film, and the temperature is kept at 20°C for 25 minutes, the temperature is increased to 85°C, and the temperature is kept for 1 hour, the temperature is increased to 115°C, and the temperature is kept for 1.5 hours, and then the release paper is covered on both sides to prepare a heat-resistant bonding tape for cotton packaging.

[0042] The amount ratio of isooctyl acrylate, methyl methacrylate, acrylic acid, acrylonitrile, modified monomer, sodium dodecylbenzene sulfonate and tetrahydrofuran described in step A1 is 65g:10g:15g:2g:10g:5g:150mL, and the amount of ammonium persulfate is 1% of the total mass of isooctyl acrylate, methyl methacrylate, acrylic acid and acrylonitrile.

[0043] The amount of the modifying additive described in step A2 is 5‰ of the mass of the polyacrylate emulsion.

[0044] The modified monomer is prepared by the following steps:

[0045] B1: Phenyltrimethoxysilane, isopropanol, sodium hydroxide and deionized water were mixed evenly, and reacted at a speed of 120 r / min and a temperature of 95°C for 10 hours to obtain sodium octaphenylcyclotetrasiloxane tetrasilanolate. Octaphenylcyclotetrasiloxane, triethylamine and tetrahydrofuran were mixed evenly, and nitrogen was introduced for protection. Methyldichlorosilane was added under stirring at a speed of 300 r / min and a temperature of 0°C. After reacting for 4 hours, the temperature was raised to 25°C and the reaction was continued for 22 hours to obtain dihydrogen cage-type silsesquioxane;

[0046] Step B2: Dihydrogen cage silsesquioxane, castor oil, Custer catalyst and toluene are mixed evenly, nitrogen is introduced for protection, and the reaction is carried out for 15 hours at a speed of 200 r / min and a temperature of 80°C to obtain modified cage silsesquioxane. The modified cage silsesquioxane, 3-isocyanate propyltrimethoxysilane, dibutyltin dilaurate and DMF are mixed evenly, nitrogen is introduced for protection, and the reaction is carried out for 9 hours at a speed of 150 r / min and a temperature of 75°C to obtain a modified monomer.

[0047] The amount ratio of phenyltrimethoxysilane, isopropanol, sodium hydroxide and deionized water described in step B1 is 4mmol:4mL:2mmol:1mmol, and the amount ratio of octaphenylcyclotetrasiloxane, triethylamine, tetrahydrofuran and methyldichlorosilane is 12g:4mL:30mL:3.5g.

[0048] The molar ratio of the dihydrogen cage silsesquioxane and castor oil described in step B2 is 2:3, the amount of the Custer catalyst is 1‰ of the mass of castor oil, the molar ratio of the hydroxyl group on the modified cage silsesquioxane and 3-isocyanate propyltrimethoxysilane is 1:1, and the amount of dibutyltin dilaurate is 2% of the mass of 3-isocyanate propyltrimethoxysilane.

[0049] The modified additive is prepared by the following steps:

[0050] Step C1: 2-butene-1,4-diol, epichlorohydrin, boron trifluoride etherate and DMF are mixed evenly, reacted at a speed of 150 r / min and a temperature of 70°C for 4 hours, and then sodium hydroxide solution is added, the temperature is raised to 75°C, and the reaction is carried out for 4 hours to obtain a modifier. Tetramethyldisiloxane, the modifier, chloroplatinic acid and DMF are mixed evenly, and reacted at a speed of 150 r / min and a temperature of 65°C for 6 hours to obtain a capping agent.

[0051] Step C2: Tetramethylcyclotetrasiloxane, octamethylcyclotetrasiloxane, tetramethylammonium hydroxide, a capping agent and dimethyl sulfoxide are mixed evenly, nitrogen is introduced for protection, and the reaction is carried out for 4 hours at a speed of 120 r / min and a temperature of 110° C. to obtain a modified polysiloxane; the modified polysiloxane, KH570, chloroplatinic acid and DMF are mixed evenly, nitrogen is introduced for protection, and the reaction is carried out for 9 hours at a speed of 200 r / min and a temperature of 75° C. to obtain a modified additive.

[0052] The amount ratio of 2-butene-1,4-diol, epichlorohydrin, boron trifluoride etherate and sodium hydroxide solution described in step C1 is 35mmol:35mmol:1g:5mL, the mass fraction of sodium hydroxide solution is 20%, the molar ratio of tetramethyldisiloxane and modifier is 1:2, and the amount of chloroplatinic acid is 1‰ of the mass of tetramethyldisiloxane.

[0053] The molar ratio of tetramethylcyclotetrasiloxane, octamethylcyclotetrasiloxane, tetramethylammonium hydroxide and capping agent in step C2 is 1:1.4:3:2, the molar ratio of Si-H bonds on the modified polysiloxane and KH570 is 1:1, and the amount of chloroplatinic acid used is 2‰ of the mass of KH570.

[0054] Embodiment 3: A method for preparing a heat-resistant laminating tape for cotton coating, comprising the following steps:

[0055] Step A1: isooctyl acrylate, methyl methacrylate, acrylic acid, acrylonitrile, modified monomer, sodium dodecylbenzene sulfonate and tetrahydrofuran are uniformly mixed, and ammonium persulfate is added under stirring at a speed of 150 r / min and a temperature of 80° C. to react for 3 hours to obtain a polyacrylic acid emulsion;

[0056] Step A2: After the polyacrylic acid emulsion and the modified additive are evenly mixed, they are coated on both sides of the PET base film, and the temperature is kept at 25°C for 30 minutes, the temperature is increased to 90°C, and the temperature is kept for 1.5 hours, and the temperature is increased to 120°C. After the temperature is kept for 1.5 hours, the release paper is covered on both sides to prepare a heat-resistant bonding tape for cotton wrapping.

[0057] The amount ratio of isooctyl acrylate, methyl methacrylate, acrylic acid, acrylonitrile, modified monomer, sodium dodecylbenzene sulfonate and tetrahydrofuran described in step A1 is 65g:10g:15g:2g:10g:5g:150mL, and the amount of ammonium persulfate is 1% of the total mass of isooctyl acrylate, methyl methacrylate, acrylic acid and acrylonitrile.

[0058] The amount of the modifying additive described in step A2 is 2-8‰ of the mass of the polyacrylate emulsion.

[0059] The modified monomer is prepared by the following steps:

[0060] B1: Phenyltrimethoxysilane, isopropanol, sodium hydroxide and deionized water were mixed evenly, and reacted at a speed of 150 r / min and a temperature of 95°C for 15 hours to obtain octaphenylcyclotetrasiloxane sodium tetrasiloxide. Octaphenylcyclotetrasiloxane, triethylamine and tetrahydrofuran were mixed evenly, and nitrogen was introduced for protection. Methyldichlorosilane was added under stirring at a speed of 300 r / min and a temperature of 0°C. After reacting for 5 hours, the temperature was raised to 25°C and the reaction was continued for 24 hours to obtain dihydrogen cage-type silsesquioxane;

[0061] Step B2: Dihydrogen cage silsesquioxane, castor oil, Custer catalyst and toluene are mixed evenly, nitrogen is introduced for protection, and the reaction is carried out for 15 hours at a speed of 200 r / min and a temperature of 85°C to obtain modified cage silsesquioxane. Modified cage silsesquioxane, 3-isocyanate propyltrimethoxysilane, dibutyltin dilaurate and DMF are mixed evenly, nitrogen is introduced for protection, and the reaction is carried out for 10 hours at a speed of 150 r / min and a temperature of 80°C to obtain a modified monomer.

[0062] The amount ratio of phenyltrimethoxysilane, isopropanol, sodium hydroxide and deionized water described in step B1 is 4mmol:4mL:2mmol:1mmol, and the amount ratio of octaphenylcyclotetrasiloxane, triethylamine, tetrahydrofuran and methyldichlorosilane is 12g:4mL:30mL:3.5g.

[0063] The molar ratio of the dihydrogen cage silsesquioxane and castor oil described in step B2 is 3:4, the amount of the Custer catalyst is 1‰ of the mass of castor oil, the molar ratio of the hydroxyl group on the modified cage silsesquioxane and 3-isocyanate propyltrimethoxysilane is 1:1, and the amount of dibutyltin dilaurate is 2% of the mass of 3-isocyanate propyltrimethoxysilane.

[0064] The modified additive is prepared by the following steps:

[0065] Step C1: 2-butene-1,4-diol, epichlorohydrin, boron trifluoride etherate and DMF are mixed evenly, reacted at a speed of 200 r / min and a temperature of 70°C for 5 hours, and then sodium hydroxide solution is added, the temperature is raised to 80°C, and the reaction is carried out for 5 hours to obtain a modifier. Tetramethyldisiloxane, the modifier, chloroplatinic acid and DMF are mixed evenly, and reacted at a speed of 150 r / min and a temperature of 70°C for 7 hours to obtain a capping agent.

[0066] Step C2: Tetramethylcyclotetrasiloxane, octamethylcyclotetrasiloxane, tetramethylammonium hydroxide, a capping agent and dimethyl sulfoxide are mixed evenly, nitrogen is introduced for protection, and the reaction is carried out for 5 hours at a speed of 150 r / min and a temperature of 110° C. to obtain a modified polysiloxane; the modified polysiloxane, KH570, chloroplatinic acid and DMF are mixed evenly, nitrogen is introduced for protection, and the reaction is carried out for 10 hours at a speed of 300 r / min and a temperature of 80° C. to obtain a modified additive.

[0067] The amount ratio of 2-butene-1,4-diol, epichlorohydrin, boron trifluoride etherate and sodium hydroxide solution described in step C1 is 35mmol:35mmol:1g:5mL, the mass fraction of sodium hydroxide solution is 20%, the molar ratio of tetramethyldisiloxane and modifier is 1:2, and the amount of chloroplatinic acid is 1‰ of the mass of tetramethyldisiloxane.

[0068] The molar ratio of tetramethylcyclotetrasiloxane, octamethylcyclotetrasiloxane, tetramethylammonium hydroxide and capping agent in step C2 is 1:1.4:3:2, the molar ratio of Si-H bonds on the modified polysiloxane and KH570 is 1:1, and the amount of chloroplatinic acid used is 2‰ of the mass of KH570.

[0069] Comparative Example 1: Compared with Example 1, no modified monomer was added to this comparative example, and the remaining steps were the same.

[0070] Comparative Example 2: Compared with Example 1, no modifying additive was added in this comparative example, and the remaining steps were the same.

[0071] Comparative Example 3: Compared with Example 1, tetramethyldisiloxane was used to replace the end-capping agent, and the remaining steps were the same.

[0072] The bonding tapes prepared in Examples 1-3 and Comparative Examples 1-3 were tested for initial adhesion according to the standard of GB / T4852-2002 with a slope angle of 30°, for sustained adhesion according to the standard of GB / T4851-2014, and for 180° peel strength according to the standard of GB / T2792-2014. The bonding time between the tape and the steel plate was set to 2 h, and the peel strength was tested at temperatures of 25 and 40°C. The samples were immersed in water at 25°C for 1 day, 3 days and 7 days to test the 180° peel strength. The test results are shown in Table 1 below.

[0073] Table 1

[0074]

[0075] It can be seen from the above table that the present application has a very good bonding effect and is resistant to high temperatures and water.

[0076] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A method for preparing a heat-resistant laminating tape for cotton coating, characterized in that: The specific steps include: Step A1: isooctyl acrylate, methyl methacrylate, acrylic acid, acrylonitrile, a modified monomer, sodium dodecylbenzene sulfonate and tetrahydrofuran are mixed and stirred, and ammonium persulfate is added to react to obtain a polyacrylic acid emulsion; Step A2: after the polyacrylic acid emulsion and the modified additive are evenly mixed, they are coated on both sides of the PET base film, and after heat preservation treatment, release paper is covered on both sides to prepare a heat-resistant bonding tape for cotton wrapping; The modified monomer is prepared by the following steps: B1: Phenyltrimethoxysilane, isopropanol, sodium hydroxide and deionized water are mixed for reaction to obtain sodium octaphenylcyclotetrasiloxane tetrasilanolate, sodium octaphenylcyclotetrasiloxane tetrasilanolate, triethylamine and tetrahydrofuran are mixed evenly, nitrogen is introduced for protection, methyldichlorosilane is added for stirring and reaction to obtain dihydrogen cage-type silsesquioxane; Step B2: uniformly mixing dihydrogen cage silsesquioxane, castor oil, Custer catalyst and toluene, introducing nitrogen protection, and reacting to obtain modified cage silsesquioxane; uniformly mixing modified cage silsesquioxane, 3-isocyanate propyltrimethoxysilane, dibutyltin dilaurate and DMF, introducing nitrogen protection, and reacting to obtain a modified monomer; The molar ratio of the dihydrogen cage silsesquioxane to castor oil is n:n+1, where n is a natural number greater than 0; The modified additive is prepared by the following steps: Step C1: After 2-butene-1,4-diol, epichlorohydrin, boron trifluoride etherate and DMF are mixed for reaction, sodium hydroxide solution is added, and the temperature is increased to continue the reaction to obtain a modifier, and tetramethyldisiloxane, the modifier, chloroplatinic acid and DMF are mixed for reaction to obtain a capping agent; Step C2: Tetramethylcyclotetrasiloxane, octamethylcyclotetrasiloxane, tetramethylammonium hydroxide, a capping agent and dimethyl sulfoxide are mixed evenly, nitrogen is introduced to protect, and a reaction is carried out to obtain a modified polysiloxane; the modified polysiloxane, KH570, chloroplatinic acid and DMF are mixed evenly, nitrogen is introduced to protect, and a reaction is carried out to obtain a modified additive.

2. The method for preparing a heat-resistant laminating tape for cotton coating according to claim 1, characterized in that: The amount ratio of isooctyl acrylate, methyl methacrylate, acrylic acid, acrylonitrile, modified monomer, sodium dodecylbenzene sulfonate and tetrahydrofuran described in step A1 is 65g:10g:15g:2g:10g:5g:150mL.

3. The method for preparing a heat-resistant laminating tape for cotton coating according to claim 1, characterized in that: The amount of the modifying additive described in step A2 is 2-8‰ of the mass of the polyacrylate emulsion.

4. The method for preparing a heat-resistant laminating tape for cotton coating according to claim 1, characterized in that: The amount ratio of phenyltrimethoxysilane, isopropanol, sodium hydroxide and deionized water described in step B1 is 4mmol:4mL:2mmol:1mmol, and the amount ratio of sodium octaphenylcyclotetrasiloxane tetrasiliconate, triethylamine, tetrahydrofuran and methyldichlorosilane is 12g:4mL:30mL:3.5g.

5. The method for preparing a heat-resistant laminating tape for cotton coating according to claim 1, characterized in that: The molar ratio of the hydroxyl group on the modified cage-type silsesquioxane and 3-isocyanatepropyltrimethoxysilane in step B2 is 1:

1.

6. The method for preparing a heat-resistant laminating tape for cotton coating according to claim 1, characterized in that: The amount ratio of 2-butene-1,4-diol, epichlorohydrin, boron trifluoride etherate and sodium hydroxide solution in step C1 is 35mmol:35mmol:1g:5mL, and the molar ratio of tetramethyldisiloxane to the modifier is 1:

2.

7. The method for preparing a heat-resistant laminating tape for cotton coating according to claim 1, characterized in that: The molar ratio of tetramethylcyclotetrasiloxane, octamethylcyclotetrasiloxane, tetramethylammonium hydroxide and the capping agent in step C2 is 1:1.4:3:2, and the molar ratio of the Si-H bond on the modified polysiloxane and KH570 is 1:

1.

8. A heat-resistant adhesive tape for cotton coating, characterized in that: Prepared according to any one of claims 1 to 7.

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