Silicone modified polyether sealant technology first developed in Japan, and in 80 years to enter the market. Zhong Yuan developed the "clock of MS polymer based sealant used for high-rise buildings in 1981" Di - Iehi Kangyo Bank headquarters in Tokyo, which marks the silicone adhesive sealant has been recognized by the market. It is the Japanese government statistics for 1986 ~ 1996 years Japan construction sealant Market changes. At the same time, Europe and the United States have been carried out on the modified silicone sealant. In early 1968, the United States General Company raises, containing hydrol, silyl radicals to ammonia ester terminated polyether, prepared room temperature curable polymer, is used as a sealant and sealant. In 1971 the United States couplet carbon company developed by an isocyanate-terminated polyether, again with functional silicon based associative preparation of silicon modified polyether technology. The Degussa company developed a modified silicone sealant and through to add proper adhesion promoters to improve its adhesion and mechanical properties of. In our country, building sealant is the earliest use of castor oil as the main putty paste, nineteen sixties medium-term development of modified bitumen ointment, 70 in the early development of the PVC cement and tar.
ACP Panels Introduction
PVC ointment, comprehensive performance has been improved significantly.80 years later, the city's modernization construction also started using polysulfide sealant, silicone and polyurethane, at first mainly rely on imports, acp panels after long-term development and accumulation, now China-made products and imported products have go halves on a fifty-fifty basis. On silicone modified polyether research is still in its initial stage, although some units have carried out research, but there was no mature product.
Acetoxy Silicone Sealant Selection
Production of polyether polyols initiator selection is very important, it directly decides the polyether groups and ultimately decided to use. If the initiator for glycol is made at both ends is hydroxy polyether; such as the initiator for the allyl alcohol is prepared end for the hydroxyl, end of a double bond polyether. Polyether to prepare modified acetoxy silicone sealant , first of all need to seal the end capping polyether narrow sense refers to the end of the hydroxyl group with various small organic molecules are etherified reaction, the hydroxyl active hydrogen by various short chain alkyl, aryl or ester substituents, terminated, the fundamental nature of polyether constant change and functional group. Generalized terminated polyether refers to the hydroxyl and small molecules outside the large molecular compounds such as polydimethylsiloxane, polyisocyanate, and reaction. As the silicone modified polyether sealant raw materials, sealing the end mainly refers to allyl terminated.
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