CN109852332B - Surface treating agent and preparation method and application thereof - Google Patents
Surface treating agent and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to a surface treating agent, a preparation method and application thereof, in particular to a surface treating agent, a preparation method thereof and application thereof in bonding of a silicon rubber heat insulating layer and a hydroxyl liner, belongs to the technical field of bonding of heat insulating layers of solid rocket motors, and particularly relates to a technology for enhancing interface bonding of the silicon rubber heat insulating layer and the hydroxyl liner. Compared with the traditional silicon rubber surface treatment method, such as corona and plasma treatment technologies, the tackifying technology adopted by the invention does not need special equipment, the operation is simple and convenient, and the treated interface has longer applicable time.
Description
Technical Field
The invention relates to a surface treating agent, a preparation method and application thereof, in particular to a surface treating agent, a preparation method thereof and application thereof in bonding of a silicon rubber heat insulating layer and a hydroxyl liner, belongs to the technical field of bonding of heat insulating layers of solid rocket motors, and particularly relates to a technology for enhancing interface bonding of the silicon rubber heat insulating layer and the hydroxyl liner.
Background
The solid rocket engine combustion chamber consists of a shell, a heat insulating layer, a lining and a propellant. Wherein the heat insulating layer plays a role in thermal protection of the shell during the combustion of the propellant; the liner serves to bond the thermal insulation layer to the propellant and maintain structural integrity. The debonding of the liner from the thermal insulation layer is one of the common failure failures of the solid rocket motor, which may cause the solid rocket motor to be in danger of disintegration, explosion, etc., and therefore a reliable bonding interface is required between the liner and the thermal insulation layer.
The silicon rubber is a heat insulation layer material with excellent ablation resistance, less smoke and storage performance. The vulcanized silicone rubber has the outstanding defects of low surface energy, poor adhesion performance and difficulty in forming a reliable adhesion interface with a lining layer of a solid rocket engine. This disadvantage constitutes a technical bottleneck which limits the use of silicone rubber insulation.
The research for improving the adhesive capacity of the vulcanized silicone rubber mainly focuses on surface treatment of the silicone rubber, the activated surface can form strong adhesion with other materials, and the existing silicone rubber surface treatment method mainly adopts physical treatment methods, such as corona and plasma treatment. The duration of the physical treatment effect is short, and the treatment equipment is difficult to adapt to the surface treatment requirements of the silicon rubber heat insulating layers inside the engine housings of different sizes.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: overcomes the defects of the prior art, provides a surface treating agent, a preparation method and application thereof, and aims to solve the bottleneck technology of applying a silicon rubber heat insulating layer to charging of a solid rocket engine. The surface treating agent adopted in the invention is applied to the surface treatment of the silicon rubber heat insulating layer and improves the interface bonding performance with the butyl hydroxyl lining.
The technical solution of the invention is as follows:
a surface treating agent comprises hydroxyl silicone oil, a cross-linking agent, a tackifier, a titanate coupling agent, a heat-resistant additive and a diluent; calculated by taking the mass of the hydroxyl silicone oil as 100 parts, the weight parts of each component are as follows:
100 parts of hydroxyl silicone oil
10-30 parts of cross-linking agent
20-80 parts of tackifier
10-40 parts of titanate coupling agent
0.5-2 parts of heat-resistant additive
50-300 parts of a diluent;
the surface treating agent can also comprise white carbon black, and the mass part of the white carbon black is not more than 40 parts by mass based on 100 parts by mass of the hydroxyl silicone oil;
the hydroxyl value of the hydroxyl silicone oil is between 4% and 12%;
the cross-linking agent is one or a mixture of more than two of ethyl orthosilicate, methyl triethoxysilane and methyl trimethoxysilane;
the tackifier is one or a mixture of gamma-aminopropyltriethoxysilane and gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane;
the titanate coupling agent is one or a mixture of tetraethyl titanate and tetrabutyl titanate;
the heat-resistant additive is one or a mixture of more than two of ferric oxide, cerium dioxide and tin dioxide;
the diluent is one of toluene and xylene.
A preparation method of a surface treating agent comprises the following steps: mixing hydroxyl silicone oil, a cross-linking agent, a tackifier, a titanate coupling agent, a heat-resistant additive and a diluent, and uniformly stirring to obtain the surface treating agent.
A preparation method of a surface treating agent comprises the following steps: mixing hydroxyl silicone oil, a cross-linking agent, a tackifier, a titanate coupling agent, a heat-resistant additive, white carbon black and a diluent, and uniformly stirring to obtain the surface treating agent.
An application of a surface treating agent in the adhesion of a silicon rubber heat insulation layer and a hydroxyl liner comprises the following steps:
(1) carrying out sand blasting or polishing treatment on the surface of the silicon rubber heat insulation layer;
(2) brushing the prepared surface treating agent on the surface of the silicon rubber heat insulating layer subjected to surface treatment in the step (1), and airing at the temperature of 20-50 ℃ for 30min-2h to form a film and solidify the film to obtain a film layer;
(3) coating a hydroxyl liner on the surface of the membrane layer obtained in the step (2), firstly, pre-curing for 4-6h at the temperature of 80-85 ℃, pouring a propellant after the pre-curing is finished, and then curing for 5-7 days along with the propellant at the temperature of 50-70 ℃ to finish the bonding of the silicon rubber heat insulating layer and the hydroxyl liner, wherein the silicon rubber heat insulating layer and the liner can form a reliable bonding interface.
Compared with the prior art, the invention has the advantages that:
(1) compared with the traditional silicon rubber surface treatment method, such as corona and plasma treatment technologies, the tackifying technology adopted by the invention does not need special equipment, the operation is simple and convenient, and the treated interface has longer applicable time.
(2) After the silicon rubber heat insulating layer is activated by the surface treating agent, the surface energy is increased, the surface chemical activity is enhanced, the butadiene lining slurry can fully infiltrate the surface of the silicon rubber, and the surface activated groups can chemically react with the butadiene lining to form a stable physical and chemical bonding interface.
(3) The silicon rubber heat insulating layer is a heat insulating material with excellent performance for a solid rocket engine. The lower surface energy of the vulcanized silicone rubber can not form a better bonding interface with the butyl hydroxyl lining, so that the application of the silicone rubber heat insulation layer is limited. The surface treatment is carried out on the vulcanized silicone rubber by adopting a proper surface treating agent, so that a firm bonding interface can be formed on the surfaces of the silicone rubber and the lining layer.
Detailed Description
The present invention is described in further detail with reference to the following specific embodiments, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Example 1
The composition of the surface treatment agent was as follows:
100 parts of hydroxyl silicone oil with the hydroxyl value of 6.0 percent; 20 parts of ethyl orthosilicate; 20 parts of gamma-aminopropyltriethoxysilane; 10 parts of tetrabutyl titanate; 1.0 part of ferric oxide; 20 parts of white carbon black; and 200 parts of dimethylbenzene.
The preparation method of the surface treating agent comprises the following steps: mixing hydroxyl silicone oil, a cross-linking agent, a tackifier, a titanate coupling agent, a heat-resistant additive, white carbon black and a diluent, and uniformly stirring to obtain the surface treating agent.
An application of a surface treating agent in the adhesion of a silicon rubber heat insulation layer and a hydroxyl liner comprises the following steps:
(1) carrying out sand blasting or polishing treatment on the surface of the silicon rubber heat insulation layer;
(2) brushing the prepared surface treating agent on the surface of the silicon rubber heat insulating layer subjected to surface treatment in the step (1), and airing at 50 ℃ for 30min to form a film and solidify to obtain a film layer;
(3) brushing or blade-coating the surface of the film layer obtained in the step (2) with butyl hydroxyl polyurethane lining slurry, firstly carrying out pre-curing at the temperature of 80 ℃ for 4h, pouring NEPE propellant after the pre-curing is finished, and then curing for 6 days at the temperature of 55 ℃ along with the NEPE propellant to finish the bonding of the silicon rubber heat insulating layer and the butyl hydroxyl lining layer, wherein the silicon rubber heat insulating layer and the lining layer can form a reliable bonding interface, the lining slurry can be soaked on the surface of the silicon rubber heat insulating layer, and the phenomenon of glue shrinkage does not occur in the brushing process.
An adhesive test piece of a steel piece/silicon rubber heat-insulating layer (the surface of which is treated by a surface treatment agent) is prepared according to Q/G173-2008 'test method of interfacial adhesive strength of a combustion chamber of a solid rocket engine phi 25mm sample tensile method', and the adhesive strength of the test piece is tested and is 2.25 MPa. The first part of the method for testing the interfacial adhesion strength of a combustion chamber of a solid rocket engine according to QJ2038.1A-2004: a combined bonding test piece of a steel piece/a silicon rubber heat insulation layer (the surface of which is treated by a surface treatment agent)/a hydroxyl liner/an NEPE propellant is prepared by a rectangular test piece pull-away method, and the combined bonding strength of the test piece is tested and is 0.70 MPa. The test results show that the silicone rubber heat insulating layer can form a reliable bonding interface with the lining.
Example 2
The composition of the surface treatment agent was as follows:
100 parts of hydroxyl silicone oil with the hydroxyl value of 4.0 percent; 10 parts of methyl orthosilicate; 10 parts of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane; 20 parts of gamma-aminopropyltriethoxysilane; tetrabutyl titanate, 30 parts; 0.5 part of cerium dioxide; 1.5 parts of ferric oxide; toluene, 50 parts.
The preparation method of the surface treating agent comprises the following steps: mixing hydroxyl silicone oil, a cross-linking agent, a tackifier, a titanate coupling agent, a heat-resistant additive and a diluent, and uniformly stirring to obtain the surface treating agent.
Surface treatment and lining coating of the silicon rubber heat insulation layer: and (3) after sand blasting or polishing, cleaning and pre-drying treatment are carried out on the silicon rubber heat insulating layer, a surface treating agent is coated on the silicon rubber heat insulating layer, and the silicon rubber heat insulating layer is aired for 1 hour at the temperature of 20 ℃. Coating the surface of the heat insulating layer after surface treatment with slurry of the butyl hydroxyl polyurethane lining layer by brushing or blade coating, and heating until the lining layer reaches a semi-curing state. Test results show that the lining slurry can be soaked on the surface of the silicon rubber heat insulation layer, and no rubber shrinkage phenomenon occurs in the brushing process.
An adhesive test piece of a steel piece/silicon rubber heat-insulating layer (the surface of which is treated by a surface treatment agent) is prepared according to Q/G173-2008 'test method of interfacial adhesive strength of a combustion chamber of a solid rocket engine phi 25mm sample tensile method', and the adhesive strength of the test piece is tested and is 2.31 MPa. The first part of the method for testing the interfacial adhesion strength of a combustion chamber of a solid rocket engine according to QJ2038.1A-2004: a combined bonding test piece of a steel piece/a silicon rubber heat insulation layer (the surface of which is treated by a surface treatment agent)/a hydroxyl liner/an NEPE propellant is prepared by a rectangular test piece pull-away method, and the combined bonding strength of the test piece is tested and is 0.65 MPa. The test results show that the silicone rubber heat insulating layer can form a reliable bonding interface with the lining.
Example 3
The composition of the surface treatment agent was as follows: 100 parts of hydroxyl silicone oil with the hydroxyl value of 8.8 percent; 10 parts of ethyl orthosilicate; 20 parts of methyltriethoxysilane; 60 parts of gamma-aminopropyltriethoxysilane; 5 parts of tetraethyl titanate; 5 parts of tetraethyl titanate; 0.5 part of tin dioxide; 0.5 part of ferric oxide; 40 parts of white carbon black; toluene, 300 parts.
The preparation method of the surface treating agent comprises the following steps: mixing hydroxyl silicone oil, a cross-linking agent, a tackifier, a titanate coupling agent, a heat-resistant additive, white carbon black and a diluent, and uniformly stirring to obtain the surface treating agent.
Surface treatment and lining coating of the silicon rubber heat insulation layer: and (3) after sand blasting or polishing, cleaning and pre-drying treatment are carried out on the silicon rubber heat insulating layer, a surface treating agent is coated on the silicon rubber heat insulating layer, and the silicon rubber heat insulating layer is aired for 1 hour at the temperature of 25 ℃. Coating the surface of the heat insulating layer after surface treatment with slurry of the butyl hydroxyl polyurethane lining layer by brushing or blade coating, and heating until the lining layer reaches a semi-curing state. Test results show that the lining slurry can be soaked on the surface of the silicon rubber heat insulation layer, and no rubber shrinkage phenomenon occurs in the brushing process.
An adhesive test piece of a steel piece/silicon rubber heat-insulating layer (the surface of which is treated by a surface treatment agent) is prepared according to Q/G173-2008 'test method of interfacial adhesive strength of a combustion chamber of a solid rocket engine phi 25mm sample tensile method', and the adhesive strength of the test piece is tested and is 1.98 MPa. The first part of the method for testing the interfacial adhesion strength of a combustion chamber of a solid rocket engine according to QJ2038.1A-2004: a combined bonding test piece of a steel piece/a silicon rubber heat insulation layer (the surface of which is treated by a surface treatment agent)/a hydroxyl liner/a hydroxyl propellant is prepared by a rectangular test piece pull-apart method, and the combined bonding strength of the test piece is tested and is 1.06 MPa. The test results show that the silicone rubber heat insulating layer can form a reliable bonding interface with the lining.
Example 4
The composition of the surface treatment agent was as follows: 100 parts of hydroxyl silicone oil with the hydroxyl value of 12.0 percent; 9 parts of methyl orthosilicate; 15 parts of methyltrimethoxysilane; 30 parts of gamma-aminopropyltriethoxysilane; tetraethyl titanate, 15 parts; 0.8 part of tin dioxide; 0.8 part of cerium dioxide; 22 parts of white carbon black; and 150 parts of dimethylbenzene.
The preparation method of the surface treating agent comprises the following steps: mixing hydroxyl silicone oil, a cross-linking agent, a tackifier, a titanate coupling agent, a heat-resistant additive, white carbon black and a diluent, and uniformly stirring to obtain the surface treating agent.
Surface treatment and lining coating of the silicon rubber heat insulation layer: and (3) after sand blasting or polishing, cleaning and pre-drying treatment are carried out on the silicon rubber heat insulating layer, a surface treating agent is coated on the silicon rubber heat insulating layer, and the silicon rubber heat insulating layer is aired for 2 hours at the temperature of 25 ℃. Coating the surface of the heat insulating layer after surface treatment with slurry of the butyl hydroxyl polyurethane lining layer by brushing or blade coating, and heating until the lining layer reaches a semi-curing state. Test results show that the lining slurry can be soaked on the surface of the silicon rubber heat insulation layer, and no rubber shrinkage phenomenon occurs in the brushing process.
An adhesive test piece of a steel piece/silicon rubber heat-insulating layer (the surface of which is treated by a surface treatment agent) is prepared according to Q/G173-2008 'test method of interfacial adhesive strength of a combustion chamber of a solid rocket engine phi 25mm sample tensile method', and the adhesive strength of the test piece is tested and is 2.05 MPa. The first part of the method for testing the interfacial adhesion strength of a combustion chamber of a solid rocket engine according to QJ2038.1A-2004: a combined bonding test piece of a steel piece/a silicon rubber heat insulation layer (the surface of which is treated by a surface treatment agent)/a hydroxyl liner/a PET propellant is prepared by a rectangular test piece pull-apart method, and the combined bonding strength of the test piece is tested and is 0.89 MPa. The test results show that the silicone rubber heat insulating layer can form a reliable bonding interface with the lining.
Example 5
The composition of the surface treatment agent was as follows: 100 parts of hydroxyl silicone oil with the hydroxyl value of 9.2 percent; 10 parts of methyl orthosilicate; 10 parts of methyltriethoxysilane; 25 parts of gamma-aminopropyltriethoxysilane; tetrabutyl titanate, 40 parts; 2 parts of ferric oxide; 15 parts of white carbon black; and 250 parts of dimethylbenzene.
The preparation method of the surface treating agent comprises the following steps: mixing hydroxyl silicone oil, a cross-linking agent, a tackifier, a titanate coupling agent, a heat-resistant additive, white carbon black and a diluent, and uniformly stirring to obtain the surface treating agent.
Surface treatment and lining coating of the silicon rubber heat insulation layer: and (3) after sand blasting or polishing, cleaning and pre-drying treatment are carried out on the silicon rubber heat insulating layer, the surface treating agent is coated on the silicon rubber heat insulating layer, and the silicon rubber heat insulating layer is aired for 0.5h at the temperature of 35 ℃. Coating the surface of the heat insulating layer after surface treatment with slurry of the butyl hydroxyl polyurethane lining layer by brushing or blade coating, and heating until the lining layer reaches a semi-curing state. Test results show that the lining slurry can be soaked on the surface of the silicon rubber heat insulation layer, and no rubber shrinkage phenomenon occurs in the brushing process.
An adhesive test piece of a steel piece/silicon rubber heat-insulating layer (the surface of which is treated by a surface treatment agent) is prepared according to Q/G173-2008 'test method of interfacial adhesive strength of a combustion chamber of a solid rocket engine phi 25mm sample tensile method', and the adhesive strength of the test piece is tested and is 2.31 MPa. The first part of the method for testing the interfacial adhesion strength of a combustion chamber of a solid rocket engine according to QJ2038.1A-2004: a combined bonding test piece of a steel piece/a silicon rubber heat insulation layer (the surface of which is treated by a surface treatment agent)/a hydroxyl liner/a hydroxyl propellant is prepared by a rectangular test piece pull-apart method, and the combined bonding strength of the test piece is tested and is 1.02 MPa. The test results show that the silicone rubber heat insulating layer can form a reliable bonding interface with the lining.
Example 6
The composition of the surface treatment agent was as follows: 100 parts of hydroxyl silicone oil with the hydroxyl value of 10.0 percent; 10 parts of methyl orthosilicate; 10 parts of methyltriethoxysilane and 10 parts of tetraethoxysilane; 60 parts of gamma-aminopropyltriethoxysilane, 20 parts of gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane; 15 parts of tetrabutyl titanate; 0.5 part of ferric oxide; 25 parts of white carbon black; and 250 parts of dimethylbenzene.
The preparation method of the surface treating agent comprises the following steps: mixing hydroxyl silicone oil, a cross-linking agent, a tackifier, a titanate coupling agent, a heat-resistant additive, white carbon black and a diluent, and uniformly stirring to obtain the surface treating agent.
Surface treatment and lining coating of the silicon rubber heat insulation layer: and (3) after sand blasting or polishing, cleaning and pre-drying treatment are carried out on the silicon rubber heat insulating layer, the surface treating agent is coated on the silicon rubber heat insulating layer, and the silicon rubber heat insulating layer is aired for 1.5 hours at the temperature of 40 ℃. Coating the surface of the heat insulating layer after surface treatment with slurry of the butyl hydroxyl polyurethane lining layer by brushing or blade coating, and heating until the lining layer reaches a semi-curing state. Test results show that the lining slurry can be soaked on the surface of the silicon rubber heat insulation layer, and no rubber shrinkage phenomenon occurs in the brushing process.
An adhesive test piece of a steel piece/silicon rubber heat-insulating layer (the surface of which is treated by a surface treatment agent) is prepared according to Q/G173-2008 'test method of interfacial adhesive strength of a combustion chamber of a solid rocket engine phi 25mm sample tensile method', and the adhesive strength of the test piece is tested and is 1.87 MPa. The first part of the method for testing the interfacial adhesion strength of a combustion chamber of a solid rocket engine according to QJ2038.1A-2004: a combined bonding test piece of a steel piece/a silicon rubber heat insulation layer (the surface of which is treated by a surface treatment agent)/a hydroxyl liner/a hydroxyl propellant is prepared by a rectangular test piece pull-apart method, and the combined bonding strength of the test piece is tested and is 1.30 MPa. The test results show that the silicone rubber heat insulating layer can form a reliable bonding interface with the lining.
Example 7
The composition of the surface treatment agent was as follows: 100 parts of hydroxyl silicone oil with the hydroxyl value of 6.6 percent; 5 parts of methyl orthosilicate; 5 parts of methyltriethoxysilane and 10 parts of tetraethoxysilane; 30 parts of gamma-aminopropyltriethoxysilane, 30 parts of gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane and 30 parts of a reaction product; 20 parts of tetrabutyl titanate; 1.5 parts of ferric oxide; and 150 parts of dimethylbenzene.
The preparation method of the surface treating agent comprises the following steps: mixing hydroxyl silicone oil, a cross-linking agent, a tackifier, a titanate coupling agent, a heat-resistant additive and a diluent, and uniformly stirring to obtain the surface treating agent.
Surface treatment and lining coating of the silicon rubber heat insulation layer: and (3) after sand blasting or polishing, cleaning and pre-drying treatment are carried out on the silicon rubber heat insulating layer, a surface treating agent is coated on the silicon rubber heat insulating layer, and the silicon rubber heat insulating layer is aired for 1.0 hour at the temperature of 50 ℃. Coating the surface of the heat insulating layer after surface treatment with slurry of the butyl hydroxyl polyurethane lining layer by brushing or blade coating, and heating until the lining layer reaches a semi-curing state. Test results show that the lining slurry can be soaked on the surface of the silicon rubber heat insulation layer, and no rubber shrinkage phenomenon occurs in the brushing process.
An adhesive test piece of a steel piece/silicon rubber heat-insulating layer (the surface of which is treated by a surface treatment agent) is prepared according to Q/G173-2008 'test method of interfacial adhesive strength of a combustion chamber of a solid rocket engine phi 25mm sample tensile method', and the adhesive strength of the test piece is tested and is 2.15 MPa. The first part of the method for testing the interfacial adhesion strength of a combustion chamber of a solid rocket engine according to QJ2038.1A-2004: a combined bonding test piece of a steel piece/a silicon rubber heat insulation layer (the surface of which is treated by a surface treatment agent)/a hydroxyl liner/an NEPE propellant is prepared by a rectangular test piece pull-away method, and the combined bonding strength of the test piece is tested and is 0.75 MPa. The test results show that the silicone rubber heat insulating layer can form a reliable bonding interface with the lining.
Claims (1)
1. A surface treating agent characterized by: the surface treating agent comprises hydroxyl silicone oil, a cross-linking agent, a tackifier, a titanate coupling agent, a heat-resistant additive and a diluent; calculated by taking the mass of the hydroxyl silicone oil as 100 parts, the weight parts of each component are as follows:
100 parts of hydroxyl silicone oil
10-30 parts of cross-linking agent
20-80 parts of tackifier
10-40 parts of titanate coupling agent
0.5-2 parts of heat-resistant additive
50-300 parts of a diluent;
the surface treating agent also comprises white carbon black, and the mass part of the white carbon black is not more than 40 parts by mass based on 100 parts by mass of the hydroxyl silicone oil;
the hydroxyl value of the hydroxyl silicone oil is between 4% and 12%;
the cross-linking agent is one or a mixture of more than two of ethyl orthosilicate, methyl triethoxysilane and methyl trimethoxysilane;
the tackifier is one or a mixture of gamma-aminopropyltriethoxysilane and gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane;
the titanate coupling agent is one or a mixture of tetraethyl titanate and tetrabutyl titanate;
the heat-resistant additive is one or a mixture of more than two of ferric oxide, cerium dioxide and tin dioxide;
the diluent is one of toluene and xylene;
the preparation method of the surface treating agent comprises the following steps: mixing hydroxyl silicone oil, a cross-linking agent, a tackifier, a titanate coupling agent, a heat-resistant additive, white carbon black and a diluent, and uniformly stirring to obtain a surface treating agent;
the surface treating agent is applied to the adhesion of a silicon rubber heat insulating layer and a hydroxyl liner:
(1) carrying out surface sand blasting or polishing treatment on the surface of the silicon rubber heat insulation layer;
(2) brushing the surface treatment agent on the surface of the silicon rubber heat insulation layer subjected to the surface treatment in the step (1), and airing to obtain a film layer;
(3) brushing a hydroxyl liner on the surface of the membrane layer obtained in the step (2), then pre-curing at the temperature of 80-85 ℃ for 4-6h, and finally curing at the temperature of 50-70 ℃ for 5-7 days to complete the bonding of the silicon rubber heat insulation layer and the hydroxyl liner;
in the step (2), the airing temperature is 20-50 ℃, and the airing time is 30min-2 h;
and (3) pouring a propellant after the precuring is finished, so that the hydroxyl liner is cured along with the propellant.
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| CN110194933B (en) * | 2019-07-02 | 2022-02-25 | 杭州之江新材料有限公司 | Primer for silane modified adhesive and preparation method thereof |
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| CN104673179A (en) * | 2013-12-03 | 2015-06-03 | 上海新力动力设备研究所 | Epoxy-acryloyloxy primer for silicon rubber heat insulating layers and preparation method thereof |
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