Time： 2019-12-11 16:38:42
Silane-modified polyether sealant, also known as silicone-modified polyether sealant and silane-terminated polyether sealant, is a silane-terminated polyether (with polyether as the main chain and siloxane at both ends. Capping) is a high-performance environmentally friendly sealant made from a base polymer. Because it has the advantages and advantages of silicone sealant and polyurethane sealant, it shows excellent weather resistance, durability, high resistance to deformation and displacement, good adhesion, coating, environmental friendliness, and low staining The advantages of low viscosity, excellent workability, etc. have been increasingly concerned by the domestic construction industry, and more and more are being obtained in industrial fields such as automobile manufacturing, rail transit, container manufacturing, equipment manufacturing, and electronics Promotion.
Performance comparison of silane modified polyether adhesive, silicone sealant and polyurethane sealant:
The reason why silane-modified polyether rubber has such good comprehensive properties is largely related to the special structure of its base polymer (silyl-terminated polyether).
Let's talk about some outstanding features of silane-modified polyether glue:
1. Extensive bonding to substrates. Due to the low surface energy and high penetrability of the base polymer (silyl-terminated polyether), it has good wetting ability to most inorganic, metal and plastic substrates, which can produce good adhesion to the substrate.
2. Excellent weather resistance and durability. Silyl-terminated polyethers use polyethers as long chains and are terminated with siloxy groups. The long-chain polyethers are characterized by low unsaturation, high molecular weight, and narrow distribution. The end groups are hydrolyzable siloxane groups. The silane-modified polyether sealant will form a network structure connected by long-chain flexible polyethers with Si—O—Si bonds as the crosslinking point after moisture curing at room temperature. This system not only has excellent weather resistance, water resistance, and resistance to water. Aging and durability performance, and can effectively prevent and avoid surface cracks of the sealant after long-term use.
3. Environmental protection. Silyl-terminated polyether is a long-chain structure of siloxy-terminated polyether, and does not contain toxic isocyanate groups and free isocyanates like polyurethane sealants. Silane-terminated polyether has low viscosity, good workability, and does not require the use of organic solvents to adjust the process performance of the formula. Therefore, silane-modified polyether glue can completely be added without any organic solvents, and its total volatile organic compounds (VOC ) Very low.
4, can be painted. The surface of ordinary silicone sealants cannot be painted and painted, and can only be formulated according to user needs. The silane-modified polyether adhesive can be painted and painted, which has good paintability.
Silane-modified polyether adhesives have attracted increasing market attention due to their wide range of bonding materials, environmental protection, and excellent weather resistance. According to Japanese construction sealant classification statistics, silane-modified polyether adhesive has been occupying the top position in the Japanese sealant market since 1995.
Gu Kangli MS adhesive is a new type of healthy silane-modified elastic sealant. It has zero odor and no formaldehyde, which relieves the concern of indoor air pollution. In addition, it has exceptional performance and has become a mainstream product widely used in Japan and the United States. In China, the silane-modified elastic sealant has become a hot spot in the research and development of the sealant industry, and the future development prospects are promising.