Condensation Type RTV silicone sealant-HongYe sili...

Sealant used in construction of the use of a large number of occupied. Urban many-storied buildings are made of glass curtain wall, this use in the open sealant is the need to engage in high standard requirements. The sealant with the time and the change of external environment the hardness change is what kind of. It is time for condensation silicone seal silicone affect hardness. Below is the detail.       Silicone sealant for building is a condensation type RTV silicone rubber the largest amount of varieties, the vast majority of sealant dip is belongs to the organic polymer materials, such as silicone, polyurethane, epoxy resin poly acid lipid. In addition to silicone, adopting the polymer material as adhesive sealant material due to its own characteristics, in the ultraviolet and the influence of environment temperature will gradually aging, specific performance for the hardness change greatly, strength and viscosity also produces very big. Condensation type RTV silicone rubber has excellent weather resistance, and most building materials have good adhesion.         Single component deoximino type silicone sealant the hardness change value higher than the dealcoholization type single, bicomponent silicone structural sealant and acid type large glass silicone sealant. Dealcoholization type single, bicomponent silicone structural sealant and acid type large glass silicone sealant hardness in curing 12 months tended to be stable; deoximino type silicone sealant hardness in curing 15 months later stabilized. Deoximino type silicone sealant the hardness change time specific alcohol type single, bicomponent silicone structural sealing and acid type large glass silicone sealant long, may be the result of ketonic oxime type silicone sealant curing time removing Ding Tongwo volatilization speed slow.         Condensation type RTV silicone sealant curing hardness in the 12 months after the time lengthened growth trends, the largest indoor outdoor exposure on growth, when placed in the growth, standard test conditions placed growth minimum; the hardness of vulcanized silicone sealant in 6-15 months have obvious piping, with the passage of time, change more and more small, one year after the basic stable; dealcoholization type bicomponent silicone structural sealant and acid large glass silicone sealant hardness increase minimum, dealcoholizing one silicone structural sealant stiffness growth time, ketoxime type silicone sealant hardness increased to maximum.