Introduction silicone sealant for construction and use of pitfalls and errors

Construction silicone sealant as today's most widely used in various building exterior decoration waterproof sealing material has been accepted by all . But with silicone sealant for construction developed rapidly, such as colloidal stiff , brittle powder, oil leakage pollution, glue seam cracking, pieces of insulating glass unit failure , deterioration and other structural bonding affect the building features and security problems have gradually show. Partly due to vicious market competition has led many manufacturers in the construction silicone sealant to increase the production of plasticizers cause , but there are also a large part because consumers do not understand the product performance or improper construction of the operator directly affect the overall performance of silicone rubber products .
To introduce the following silicone sealants used in construction as well as the basics of the process in the purchase and use of a number of errors and improper methods .
1 Introduction silicone sealant
A, the characteristics of silicone sealant
Silicone sealant refers to a linear polysiloxane as the main raw materials to produce sealants, also called silicone sealant .
Silicone sealant polymer main chain mainly composed of silicon -oxygen -silicon bond composition , coloured cable ties cross-linking agent during the curing reaction of the base polymer to form a network of Si-Q-Si backbone structure . And other polymers , and organic sealant (such as: polyurethane sealant, acrylic sealant, polysulfide sealant , etc. ) compared to the most significant feature is the excellent high temperature properties and weather resistance properties.
Above table shows , Si-0-Si bond can be very high, not only much larger than the other polymers bond energy ( other chemical bond are below 300nrn UV bond energy ) , and Si 101 Si bond energy is higher than UV bond energy , which is used in construction sealants under UV irradiation still maintain good performance, but other organic polymer material is easily root cause of aging . Therefore, construction silicone sealant has very good weather resistance.
B, m with silicone sealant construction Classification
Silicone sealant construction is mostly used at room temperature vulcanizing (RTV) type condensation cure system, security seals that does not require heat curing , can be cured at room temperature , and the curing process will release some small molecules .