SBS modified asphalt waterproofing roll-roofing in the process of storage and transportation to avoid sun and rain, dry and ventilated environment storage. Storage temperature shall not corresponding specifications product flexibility test temperature (- ℃), should not be higher than 50 ℃, vertical storage, the height of no more than two layers.
SBS modified asphalt waterproofing membrane is a special fiber, with water resistance, corrosion resistance, not easy to deformation.
Alkyl-modified silicone is a long-chain alkyl group that completely or partially replaces a methyl group on the repeating unit of polysiloxane. Compared with polydimethylsiloxane, its compatibility with coatings has been improved a lot. , But has a higher surface tension, and has little effect on the slippage of the coating. Therefore, polymethylalkylsiloxane is rarely used alone, usually in polyether-modified silicone or aralkyl-modified organic On the main chain of silicon siloxane, some methyl groups are substituted with alkyl groups to produce polyether-modified or aralkyl-modified polymethylalkylsiloxanes to further improve compatibility.
Generally speaking, silicone additives are not reactive, and they do not participate in the crosslinking reaction of the resin. However, in some special applications, it is hoped that the organic silicon additives can be combined with the film-forming substances through chemical bonds to improve certain physical properties. Therefore, buy carnauba wax synthetic silicones with reactive groups (such as primary hydroxyl, vinyl, epoxy or isocyanate) at one or both ends of the siloxane chain, or at the end of the organic modification group, make these products It can cross-link with the resin in the coating to bond firmly with the coating film and cover the surface of the coating film, making it more durable in improving the smoothness, gloss and anti-blocking properties of the coating film. For example, BY K-370 is a polyester-modified hydroxyl-containing silicone, BY K 371 is a polyester-modified vinyl-containing silicone, and BY K-375 is a polyether polyester-modified hydroxyl-containing silicone.
The modified silicone with primary hydroxyl groups at both ends, such as HX-3081, has a very low surface tension. It can be used as an anti-cratering additive to help the coating film wetting the contaminated low surface tension substrate. In coatings containing low surface tension contaminants such as silicone oil and motor oil, the formation of shrinkage cavities is suppressed. Because reactive silicone is not as easy to cause shrinkage of the coating film as polydimethylsiloxane, its reactive groups are chemically bonded to the resin in the coating film, so that the silicone becomes a part of the cured resin and will not form Small insoluble droplets cause shrinkage.
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