Ruilangda® Achieve further technological innovation achievements in the field of automobiles and vehicles. Recently, the company has once again obtained a national invention patent authorization, with the patent name: A two-component modified silicone rubber adhesive for automotive cabin door bonding, its preparation method and bonding process, patent number: ZL 2022 1 1383084.2
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The traditional method of connecting car skin and skeleton is welding. The welding points that appear, no matter how they are polished or coated with atomic ash, will have uneven appearance and affect aesthetics. In addition, with the progress of lightweighting in automobiles, a large amount of aluminum and lightweight materials are being used instead of steel, making welding between steel and aluminum a difficult problem. Therefore, cabin door adhesives have emerged as a result.
After bonding the cabin door, it must be initially fixed within 1 hour and needs to be repaired; There will be initial adhesion force after 2 hours, and cohesive failure is required; Single component adhesives are moisture absorbing and cannot meet the bonding requirements of cabin doors. Therefore, two-component adhesives must be used to meet the usage requirements. At present, the materials available for two-component adhesive include polysulfide sealant, epoxy sealant, acrylic sealant, polyurethane sealant, MS (SPU) sealant, and silicone rubber sealant. From the experimental results, it can be seen that polysulfide sealant and acrylic sealant do not meet environmental protection requirements; The poor toughness and peel strength of epoxy sealant do not meet the requirements for adhesive toughness of cabin doors; The initial adhesion of polyurethane sealant is poor and cannot achieve cohesive failure, making it impossible to carry out subsequent process construction; The bonding performance of MS (SPU) sealant is excellent, but its electrophoretic performance is poor; After bonding with silicone rubber, various properties are excellent, but there is shrinkage after painting and the strength is not high.
In order to overcome the shortcomings of existing technology, the present invention provides a two-component modified silicone rubber and its bonding process that is environmentally friendly, can achieve rapid bonding, and has good flexibility, adhesion, high temperature resistance, and electrophoretic coating performance. It not only solves the problem of shrinkage after electrophoretic coating of existing silicone rubber, but also activates the cleaning agent to be suitable for surface treatment of any metal material before gluing, and the entire bonding process is simple and universal. Strong adhesion to materials such as steel, aluminum, glass, plastic, ceramics, etc., widely used for bonding and sealing in the fields of automobiles, high-speed trains, mechanical equipment, etc.