Primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil and preparation method thereof

Abstract

The invention discloses a one-component room temperature vulcanized silicone rubber without primer and dealcoholization for water-resistant bonding of hydrophilic aluminum foil, which comprises the following components by weight: 100 parts of polydimethylsiloxane; 80-120 parts of filler; 3-8 parts of crosslinking agent; 1.5-5 parts of synergist; 1-8 parts of coupling agent; 0.1-8 parts of catalyst. Polydimethylsiloxane and filler are uniformly mixed according to the above mass component ratio, and the mixture is dehydrated for 2-4 hours at 80-150°C, vacuumed at 0.097 to 0.092Mpa, and then cooled below 40°C, and a crosslinking agent, a synergist, a coupling agent and a catalyst are added, and the mixture is vacuumed at 0.097 to 0.092Mpa, and stirred in a closed manner for 30±10min, and the material is sealed and stored to obtain a one-component room temperature vulcanized silicone rubber without primer and dealcoholization for water-resistant bonding of hydrophilic aluminum foil. The vulcanized silicone rubber prepared by the present invention has low toxicity and low odor, and has the characteristics of rapid deep curing, and can have the characteristics of long-term water-resistant bonding without the need for a primer, which is more in line with human needs for environmental protection.

Description

Technical Field

[0001] The invention belongs to the field of sealants, and particularly relates to a primer-free dealcoholized one-component room temperature vulcanized silicone rubber used for water-resistant bonding of hydrophilic aluminum foil and a preparation method thereof. Background Art

[0002] Hydrophilic aluminum foil is the main raw material for heat exchanger plates of household air conditioners, and has a great impact on the heat dissipation efficiency of air conditioners. Hydrophilic aluminum foil is a hydrophilic treatment of aluminum foil. Through special processing, a hydrophilic layer is coated on its surface, so that condensed water will quickly disperse on the hydrophilic aluminum foil and will not condense into water droplets, which is beneficial to increase the heat exchange area, speed up the cooling and heating speed, and effectively avoid the noise caused by condensed water blocking the air flow.

[0003] The prior art is unable to meet the demand of long-term water-resistant bonding, and needs to be used in conjunction with the primer for pretreatment before sizing. In this way, not only is the operating procedure complicated, but the primer contains more volatile substances, which is more volatile, seriously affecting the production environment and causing great harm to the health of production personnel. It is particularly important to point out that the prior art CN107987788A is applied to the bonding product of hydrophilic aluminum foil, which is mainly a deoxime system organic silicone sealant. Although it can meet the requirements without primer, it releases oxime-type small molecules during the curing process, and the smell and toxicity of oxime-type small molecules are relatively large. Therefore, for hydrophilic aluminum foil materials, it is urgent to develop a kind of hydrophilic aluminum foil water-resistant bonding free primer dealcoholization type one-component room temperature vulcanized silicone rubber.

[0004] Compared with the prior art, the primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil provided by the present invention selects a special synergist, which is prepared from silane with a long-chain alkyl group having a carbon number greater than or equal to 6, a fluorinated alkyl silane and an amide-containing silane in a weight ratio of 1:(1-5):(0.5-2). The amide group of the amide-containing silane with strong polarity forms a van der Waals force with the hydroxyl group on the surface of the hydrophilic aluminum foil substrate, and then an extremely hydrophobic protective layer is formed on the surface of the organic silica gel through the introduction of extremely hydrophobic long-chain alkyl and fluorinated alkyl, which can effectively protect the bonding interface formed by the coupling agent and the hydrophilic aluminum foil to prevent water molecules from damaging the bonding interface for a long time.

[0005] In addition, pre-hydrolyzed organosilicon can have better compatibility and increase the content of hydrophobic groups and reactive siloxane groups. Under the action of the catalyst, the curing depth and cross-linking degree of the system are greatly improved. The obtained primer-free dealcoholized one-component room temperature vulcanized silicone rubber for hydrophilic aluminum foil water-resistant bonding has the advantages of long-term water-resistant bonding, etc. Summary of the invention

[0006] The purpose of the present invention is to provide a primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil, which has low toxicity and low odor, and has the characteristics of rapid deep curing, and can achieve long-term water-resistant bonding without the need for a primer, which is more in line with human needs for environmental protection.

[0007] Necessarily, the present invention also provides a method for preparing the above-mentioned hydrophilic aluminum foil water-resistant bonding primer-free dealcoholization type one-component room temperature vulcanized silicone rubber.

[0008] The technical solution of the present invention is:

[0009] A primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil, comprising the following components in parts by weight:

[0010]

[0011] Wherein, the synergist is prepared by the following method:

[0012] Mix silane with a long-chain alkyl group having 6 or more carbon atoms, fluorinated alkyl silane and amide-containing silane in a weight ratio of 1:(1-5):(0.5-2), add 2-6% of purified water, react at -30-50°C for 10-120min under nitrogen protection, then vacuum at 80-150°C, evacuate to -0.097 to -0.092Mpa, remove by-products for 10-60min, and seal for storage.

[0013] Wherein, the silane with a long-chain alkyl group having a carbon number greater than or equal to 6 is selected from n-dodecyltrimethoxysilane, n-hexadecyltrimethoxysilane, and n-octyltrimethoxysilane;

[0014] The silane containing fluorinated alkyl group is selected from dodecafluoroheptylpropyltrimethoxysilane, 1H,1H,2H,2H-perfluorodecyltrimethoxysilane, 3,3,3-trifluoropropyltrimethoxysilane, 1H,1H,2H,2H-perfluorooctyltrimethoxysilane and hydrolyzate thereof;

[0015] The amide-containing silane is selected from γ-acetylaminopropyltrimethoxysilane, γ-acetylaminopropyltriethoxysilane and hydrolyzates thereof.

[0016] The long-chain alkyl silane with carbon atoms greater than or equal to 6 described in the present invention contains only silane with the structural formula CH3(CH2)n-alkyl, and does not contain active groups such as fluoroalkyl and amide groups.

[0017] The polydimethylsiloxane is selected from one or a mixture of α,ω-dihydroxy polydimethylsiloxane, methyl polydimethylsiloxane, methyl dimethoxy-terminated polydimethylsiloxane, trimethoxy-terminated polydimethylsiloxane, and vinyl dimethoxy-terminated polydimethylsiloxane.

[0018] The dynamic viscosity of the polydimethylsiloxane is 1000-80000 mPa.s, and the testing standard is GB / T10247-2008.

[0019] Wherein, the crosslinking agent is selected from one or a mixture of more than one of vinyltrimethoxysilane, vinyltriethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, tetramethoxysilane and phenyltrimethoxysilane.

[0020] Wherein, the coupling agent is selected from one or a mixture of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, 3-aminopropylmethyldimethoxysilane, 3-aminopropylmethyldiethoxysilane, isocyanatepropyltrimethoxysilane, isocyanatepropyltriethoxysilane, 3-(methacryloyloxy)propyltrimethoxysilane, γ-[(2,3)-epoxypropyl]propyltrimethoxysilane, 1,3,5-tris(trimethoxysilylpropyl)isocyanurate, γ-mercaptopropyltrimethoxysilane, and γ-acetamidopropyltrimethoxysilane.

[0021] The filler is selected from one or a mixture of more than one of calcium carbonate, talc, zinc borate, titanium dioxide, silicon powder, quartz powder, aluminum hydroxide, aluminum oxide, white carbon black, carbon black, magnesium oxide, zinc oxide, barium carbonate, diatomaceous earth and kaolin.

[0022] The catalyst is selected from the group consisting of dioctyltin diacetate, dioctyltin dilaurate, dioctyltin dioctoate, dibutyltin diacetate, dibutyltin dilaurate, dibutyltin dioctoate, isopropyl titanate, n-butyl titanate, ethyl acetoacetate chelate of isopropyl titanate, and acetylacetone chelate of isopropyl titanate, or a mixture of more than one of the following.

[0023] A method for preparing the above-mentioned primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil, characterized by comprising the following steps:

[0024] The polydimethylsiloxane and the filler are uniformly mixed according to the above mass component ratio, and the mixture is dehydrated at 80-150° C. and vacuumed at -0.097 to -0.092 MPa for 2 to 4 hours. The mixture is then cooled below 40° C., and a crosslinking agent, a synergist, a coupling agent and a catalyst are added. The mixture is vacuumed at -0.097 to -0.092 MPa, and stirred in a closed manner for 30±10 minutes. The discharged material is sealed and stored to obtain a primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0026] Example 1

[0027] In a dynamic mixing mixer, 100 parts by weight of trimethoxy-terminated polydimethylsiloxane (dynamic viscosity at 25° C. is 20,000 mPa.s) and 100 parts of calcium carbonate filler are added and mixed and stirred. The mixture is dehydrated at 100° C. and vacuumed at -0.095 MPa for 2 hours. The mixture is then cooled below 40° C., and 5 parts by weight of methyltrimethoxysilane, 3.5 parts by weight of a synergist, 3 parts by weight of γ-aminopropyltrimethoxysilane and 5 parts by weight of ethyl acetoacetate chelate of isopropyl titanate are added. The mixture is vacuumed at -0.095 MPa and stirred in a closed manner for 30 minutes. The discharged material is sealed and stored to obtain a primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil.

[0028] Wherein, the synergist: the weight ratio of hexadecyltrimethoxysilane: 3,3,3-trifluoropropyltrimethoxysilane: γ-acetylaminopropyltriethoxysilane = 1:2:1.5, add 5% of pure water by mass of organic silane, react at -15°C for 50 minutes under nitrogen protection environment, then 100°C, vacuumize at -0.095Mpa for 30 minutes to remove by-products, and seal for storage.

[0029] Example 2

[0030] In a dynamic mixing mixer, 100 parts by weight of α, ω-dihydroxy polydimethylsiloxane (dynamic viscosity at 25° C. is 5000 mPa.s) and 120 parts of calcium carbonate filler are added and mixed and stirred. The mixture is dehydrated at 100° C. and vacuum at -0.095 MPa for 2 hours. The mixture is then cooled below 40° C., 8 parts by weight of methyltrimethoxysilane, 1.5 parts by weight of a synergist, 8 parts by weight of isocyanatepropyltrimethoxysilane and 8 parts by weight of ethyl acetoacetate chelate of isopropyl titanate are added. The mixture is vacuum at -0.095 MPa and stirred in a closed manner for 30 minutes. The discharged material is sealed and stored to obtain a primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil.

[0031] Among them, the synergist: the weight ratio of n-dodecyltrimethoxysilane: dodecafluoroheptylpropyltrimethoxysilane: γ-acetylaminopropyltriethoxysilane is 1:1:0.5, and pure water with a mass percentage of 2% of the organic silane is added. Under a nitrogen protection environment, the reaction is carried out at -15°C for 50 minutes, and then at 100°C, vacuumed to -0.095Mpa for 30 minutes to remove the by-products, and sealed for storage.

[0032] Example 3

[0033] In a dynamic mixing mixer, 100 parts by weight of trimethoxy-terminated polydimethylsiloxane (dynamic viscosity at 25°C is 80,000 mPa.s) and 80 parts of aluminum hydroxide filler are added and mixed and stirred, at 100°C, vacuum -0.095 MPa, dehydration time is 2 hours, then the temperature is lowered below 40°C, 3 parts by weight of methyltrimethoxysilane, 5 parts by weight of synergist, 1 part by weight of γ-mercaptopropyltrimethoxysilane and 0.1 part by weight of dibutyltin dilaurate are added, vacuum -0.095 MPa, closed stirring for 30 minutes, the discharged material is sealed and stored, and a primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil is obtained.

[0034] Wherein, the synergist: the weight ratio of hexadecyltrimethoxysilane: 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane: γ-acetylaminopropyltriethoxysilane = 1:5:2, add 6% of pure water by mass of organic silane, react at -15°C for 50 minutes under nitrogen protection environment, then 100°C, vacuumize at -0.095Mpa for 30 minutes to remove by-products, and seal for storage.

[0035] Example 4

[0036] In a dynamic mixing mixer, 100 parts by weight of trimethoxy-terminated polydimethylsiloxane (dynamic viscosity at 25° C. is 50,000 mPa.s) and 100 parts of silicon micropowder filler are added and mixed and stirred. The mixture is dehydrated at 100° C. and vacuum at -0.095 MPa for 2 hours. The temperature is then lowered to below 40° C., and 5 parts by weight of phenyltrimethoxysilane, 3.5 parts by weight of a synergist, 2 parts by weight of 1,3,5-tris(trimethoxysilylpropyl)isocyanurate and 6 parts by weight of isopropyl titanate are added. The mixture is vacuum at -0.095 MPa and stirred in a closed manner for 30 minutes. The material is sealed and stored to obtain a primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil.

[0037] Among them, the synergist: the weight ratio of n-octyltrimethoxysilane: 1H, 1H, 2H, 2H-perfluorodecyltrimethoxysilane: γ-acetylaminopropyltrimethoxysilane = 1:3.5:1, pure water with a mass percentage of 3% of the organic silane is added, and the reaction is carried out at -15°C for 50 minutes under a nitrogen protection environment, and then at 100°C, vacuumed to -0.095Mpa for 30 minutes to remove the by-products, and sealed for storage.

[0038] Comparative Example 1

[0039] In a dynamic mixing mixer, 100 parts by weight of trimethoxy-terminated polydimethylsiloxane (dynamic viscosity at 25° C. is 20,000 mPa.s) and 100 parts of calcium carbonate filler are added and mixed and stirred. The mixture is dehydrated at 100° C. and vacuumed at -0.095 MPa for 2 hours. The temperature is then lowered to below 40° C., and 5 parts by weight of methyltrimethoxysilane, 3 parts by weight of γ-aminopropyltrimethoxysilane and 5 parts by weight of ethyl acetoacetate chelate of isopropyl titanate are added. The mixture is vacuumed at -0.095 MPa and stirred in a closed manner for 30 minutes. The discharged material is sealed and stored to obtain a primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil.

[0040] Comparative Example 2

[0041] In a dynamic mixing mixer, 100 parts by weight of trimethoxy-terminated polydimethylsiloxane (dynamic viscosity at 25° C. is 20,000 mPa.s) and 100 parts of calcium carbonate filler are added and mixed and stirred. The mixture is dehydrated at 100° C. and vacuumed at -0.095 MPa for 2 hours. The mixture is then cooled below 40° C., and 5 parts by weight of methyltrimethoxysilane, 3.5 parts by weight of a synergist, 3 parts by weight of γ-aminopropyltrimethoxysilane and 5 parts by weight of ethyl acetoacetate chelate of isopropyl titanate are added. The mixture is vacuumed at -0.095 MPa and stirred in a closed manner for 30 minutes. The discharged material is sealed and stored to obtain a primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil.

[0042] Among them, the synergist: 3,3,3-trifluoropropyltrimethoxysilane:γ-acetylaminopropyltriethoxysilane = 2:1.5, add pure water with a mass percentage of 5% of organic silane, react at -15°C for 50 minutes under nitrogen protection environment, then 100°C, vacuum -0.095Mpa for 30 minutes to remove by-products, and seal for storage.

[0043] Comparative Example 3

[0044] In a dynamic mixing mixer, 100 parts by weight of trimethoxy-terminated polydimethylsiloxane (dynamic viscosity at 25° C. is 20,000 mPa.s) and 100 parts of calcium carbonate filler are added and mixed and stirred. The mixture is dehydrated at 100° C. and vacuumed at -0.095 MPa for 2 hours. The mixture is then cooled below 40° C., and 5 parts by weight of methyltrimethoxysilane, 3.5 parts by weight of a synergist, 3 parts by weight of γ-aminopropyltrimethoxysilane and 5 parts by weight of ethyl acetoacetate chelate of isopropyl titanate are added. The mixture is vacuumed at -0.095 MPa and stirred in a closed manner for 30 minutes. The discharged material is sealed and stored to obtain a primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil.

[0045] Wherein, the synergist: the weight ratio of n-hexadecyltrimethoxysilane:γ-acetylaminopropyltriethoxysilane is 1:1.5, and pure water with a mass percentage of 5% of the organosilane is added. Under a nitrogen protection environment, the reaction is carried out at -15°C for 50 minutes, and then at 100°C, vacuumed to -0.095Mpa for 30 minutes to remove the by-products, and the product is sealed and stored.

[0046] Comparative Example 4

[0047] In a dynamic mixing mixer, 100 parts by weight of trimethoxy-terminated polydimethylsiloxane (dynamic viscosity at 25° C. is 20,000 mPa.s) and 100 parts of calcium carbonate filler are added and mixed and stirred. The mixture is dehydrated at 100° C. and vacuumed at -0.095 MPa for 2 hours. The mixture is then cooled below 40° C., and 5 parts by weight of methyltrimethoxysilane, 3.5 parts by weight of a synergist, 3 parts by weight of γ-aminopropyltrimethoxysilane and 5 parts by weight of ethyl acetoacetate chelate of isopropyl titanate are added. The mixture is vacuumed at -0.095 MPa and stirred in a closed manner for 30 minutes. The discharged material is sealed and stored to obtain a primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil.

[0048] The synergist is: hexadecyltrimethoxysilane:3,3,3-trifluoropropyltrimethoxysilane=1:2 by weight, pure water with a mass percentage of 5% of the organosilane is added, and the mixture is reacted at -15°C for 50 minutes under a nitrogen protection environment, and then vacuumed at 100°C at -0.095Mpa for 30 minutes to remove the by-products, and then sealed for storage.

[0049] Comparative Example 5

[0050] In a dynamic mixing mixer, 100 parts by weight of trimethoxy-terminated polydimethylsiloxane (dynamic viscosity at 25° C. is 20,000 mPa.s) and 100 parts of calcium carbonate filler are added and mixed and stirred. The mixture is dehydrated at 100° C. and vacuumed at -0.095 MPa for 2 hours. The mixture is then cooled below 40° C., and 5 parts by weight of methyltrimethoxysilane, 3.5 parts by weight of a synergist, 3 parts by weight of γ-aminopropyltrimethoxysilane and 5 parts by weight of ethyl acetoacetate chelate of isopropyl titanate are added. The mixture is vacuumed at -0.095 MPa and stirred in a closed manner for 30 minutes. The discharged material is sealed and stored to obtain a primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil.

[0051] Among them, the synergist: by weight ratio of hexadecyl trimethoxysilane: 3,3,3-trifluoropropyl trimethoxysilane: γ-acetylaminopropyl triethoxysilane = 1:2:1.5

[0052] Table 1 Materials used in Examples and Comparative Examples (Unit: parts by weight)

[0053] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Dimethicone 100 100 100 100 100 100 100 100 100 filler 100 120 80 100 100 100 100 100 100 Crosslinking agent 5 8 3 5 5 5 5 5 5 Synergist 3.5 1.5 5 3.5 0 3.5 3.5 3.5 3.5 Coupling agent 3 8 1 2 3 3 3 3 3 catalyst 5 8 0.1 6 5 5 5 5 5

[0054] The compositions prepared in the examples and comparative examples were subjected to performance tests. The test methods are as follows. The test results are listed in Table 2.

[0055] Surface drying time: Tested according to GB / T 13477-1992

[0056] Tensile strength: Tested according to GB / T 528-2009

[0057] Hardness: Tested according to GB / T531.1-2008

[0058] Preparation method of tensile strength and hardness test specimens: Use a polytetrafluoroethylene container with a wedge-shaped groove with a depth of 2 mm, a length of 25 cm, and a width of 20 cm, and evenly pour the prepared weather-resistant bonding, fast deep-curing, single-component room temperature vulcanized silicone into the polytetrafluoroethylene container. Then place the prepared sample at a temperature of (23±2)°C and a relative humidity of 55% for curing for 7 days, take it out, obtain the test specimen, and cut it for performance testing.

[0059] Water-resistant bonding test method: The hydrophilic aluminum foil material does not require primer treatment. The test glue sample is prepared according to GB / T 15254. After the glue is applied, the colloid is cured for 7 days at a temperature of (23±2)℃ and a relative humidity of 55%. It is then soaked in tap water for 7d, 14d, 21d, and 28d, and then taken out. The adhesion is then measured according to GB / T 15254 to determine the bonding condition of the colloid module after water immersion.

[0060] The curing depth test method is as follows: use a polytetrafluoroethylene test plate with a wedge-shaped groove of 5 cm in length, 5 cm in width and 20 mm in depth, and evenly pour the prepared weather-resistant adhesive, fast deep-curing single-component room temperature vulcanized organic silicone into the wedge-shaped groove of the polytetrafluoroethylene test plate. Then place the test plate at a temperature of (23±2)°C and a relative humidity of 55% for curing to form a test sample. After 4 hours, the test sample is peeled off the test plate to compare the curing depth.

[0061] Table 2 Performance test table of the compositions obtained in the embodiments and comparative examples

[0062]

[0063]

[0064] The data show that the primer-free dealcoholized one-component room temperature vulcanized silicone rubber used for water-resistant bonding of hydrophilic aluminum foil of the present invention is optimized by formula design and adopts the synergistic effect of a synergist and a coupling agent made from specific raw materials to obtain a dealcoholized silicone adhesive sealant with long-term water-resistant bonding without the need for primer treatment. The synergist of the present invention is first hydrolyzed and then added to the composition, which can improve the curing depth of the vulcanized silicone rubber and at the same time have better bonding strength.

[0065] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A one-component room temperature vulcanized silicone rubber without primer and dealcoholization for water-resistant bonding of hydrophilic aluminum foil, characterized in that The components include the following by weight: 100 parts of polydimethylsiloxane; 80-120 parts of filler; 3-8 parts of cross-linking agent; Synergist 1.5-5 parts; 1 to 8 parts of coupling agent; Catalyst 0.1-8 parts; The synergist is prepared by the following method: Mix a silane with a long-chain alkyl group having a carbon number greater than or equal to 6, a fluorinated alkyl silane and an amide-containing silane in a weight ratio of 1:(1-5):(0.5-2), add 2-6% of purified water, react at -30-50°C for 10-120 minutes under a nitrogen protection environment, then vacuum at 80-150°C, evacuate to -0.097 to -0.092Mpa, remove by-products for 10-60 minutes, and seal for storage; The crosslinking agent is selected from one of vinyl trimethoxy silane, vinyl triethoxy silane, methyl trimethoxy silane, methyl triethoxy silane, tetramethoxy silane, phenyl trimethoxy silane or a mixture of more than one of them.

2. The primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil according to claim 1, characterized in that: The silane with a long-chain alkyl group having a carbon number greater than or equal to 6 is selected from n-dodecyltrimethoxysilane, n-hexadecyltrimethoxysilane, and n-octyltrimethoxysilane; The silane containing fluorinated alkyl group is selected from dodecafluoroheptylpropyltrimethoxysilane, 1H,1H,2H,2H-perfluorodecyltrimethoxysilane, 3,3,3-trifluoropropyltrimethoxysilane, 1H,1H,2H,2H-perfluorooctyltrimethoxysilane and hydrolyzate thereof; The amide-containing silane is selected from γ-acetylaminopropyltrimethoxysilane, γ-acetylaminopropyltriethoxysilane and hydrolyzates thereof.

3. The primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil according to claim 1, characterized in that: The polydimethylsiloxane is selected from one or a mixture of α,ω-dihydroxy polydimethylsiloxane, methyl polydimethylsiloxane, methyl dimethoxy-terminated polydimethylsiloxane, trimethoxy-terminated polydimethylsiloxane, and vinyl dimethoxy-terminated polydimethylsiloxane.

4. The primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil according to claim 1, characterized in that: The dynamic viscosity of the polydimethylsiloxane is 1000-80000 mPa.s, and the testing standard is GB / T 10247-2008.

5. The primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil according to claim 1, characterized in that: The coupling agent is selected from the group consisting of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, 3-aminopropylmethyldimethoxysilane, 3-aminopropylmethyldiethoxysilane, isocyanatepropyltrimethoxysilane, isocyanatepropyltriethoxysilane, 3-(methacryloyloxy)propyltrimethoxysilane, γ-[(2,3)-epoxypropyl]propyltrimethoxysilane, 1,3,5-tris(trimethoxysilylpropyl)isocyanurate, γ-mercaptopropyltrimethoxysilane, and γ-acetamidopropyltrimethoxysilane, or a mixture of more than one thereof.

6. The primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil according to claim 1, characterized in that: The filler is selected from one or a mixture of calcium carbonate, talc, zinc borate, titanium dioxide, silicon powder, quartz powder, aluminum hydroxide, aluminum oxide, white carbon black, carbon black, magnesium oxide, zinc oxide, barium carbonate, diatomaceous earth, and kaolin.

7. The primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil according to claim 1, characterized in that: The catalyst is selected from the group consisting of dioctyltin diacetate, dioctyltin dilaurate, dioctyltin dioctoate, dibutyltin diacetate, dibutyltin dilaurate, dibutyltin dioctoate, isopropyl titanate, n-butyl titanate, ethyl acetoacetate chelate of isopropyl titanate, and acetylacetone chelate of isopropyl titanate, or a mixture of more than one of the following.

8. A method for preparing the primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil as described in any one of claims 1 to 7, characterized in that The following steps are involved: The polydimethylsiloxane and the filler are uniformly mixed according to the above mass component ratio, and the mixture is dehydrated at 80-150° C. and vacuumed at -0.097 to -0.092 MPa for 2 to 4 hours. The mixture is then cooled below 40° C., and a crosslinking agent, a synergist, a coupling agent and a catalyst are added. The mixture is vacuumed at -0.097 to -0.092 MPa, and stirred in a closed manner for 30±10 minutes. The discharged material is sealed and stored to obtain a primer-free dealcoholized one-component room temperature vulcanized silicone rubber for water-resistant bonding of hydrophilic aluminum foil.

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