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Silane Modified Polymer - A Safe and Environmentally Friendly Adhesive Material under High Dynamic Loads

2020/03/10
In 1963, GM used an adhesive instead of a rubber gasket to bond the windshield to the test vehicle for the first time. In 1978, bonding technology became the standard practice of the American automotive industry and began to be popular around the world. The reason is that the bonding process is more economical and efficient, and the effective connection between the components and the load-bearing structure such as the body or the frame is greatly improved, thereby greatly improving the safety of the automobile.

Adhesives are mainly used for structural bonding and sealing in the field of road traffic and rail transportation. The key technology is elastic bonding. Therefore, the materials used for the adhesive layer and the waterproof film subjected to high dynamic stress must have both high elasticity and tear resistance. In addition, the closed environment of the vehicle requires that the vehicle adhesive has low performance, does not contain toxic and harmful substances, and must have good weather resistance and ultraviolet resistance.

Silane modified polymer can be used to formulate shear-resistant materials with high tensile strength and can completely replace traditional epoxy or polyurethane systems. It achieves fast cure without the addition of an organotin catalyst and does not contain any free isocyanate. It has a lower VOC content and is more environmentally friendly. It has excellent storage stability, is not volatile, is not sensitive to ambient temperature and humidity, and has excellent UV resistance.

It has good compatibility with other silane modified polymers and can be mixed in any proportion to adjust various properties of the binder system to meet specific application requirements, and is suitable for most common substrates of vehicles.

From the principle of the alpha silane modification technique, the silane modified polymer contains a blocked silane component coupled to the organic polymer backbone. Its unique "α-effect" can achieve rapid curing, that is, the distance between the silicon atom in the α-silane-terminated polymer and the nitrogen atom in the methyl carbamate group is the closest, which accelerates the cross-linking condensation reaction. Therefore, rapid curing can be achieved without the addition of an organotin catalyst.