Polyurethane sealant for construction

Abstract

Polyurethane sealant for construction, including: polyurethane prepolymer, phosphonate flame retardant plasticizer, flame retardant synergist, plasticizer, thixotropic agent, filler, light stabilizer, antioxidant, catalyst A, silane Adhesion promoter, moisture scavenger. The present invention achieves flame retardancy on the skeleton structure of the sealant, and achieves good flame retardancy without reducing the physical properties, thixotropic properties, and constructability of the product.

Description

technical field [0001] The invention belongs to the field of sealants, in particular to polyurethane sealants for construction. Background technique [0002] Due to its good physical and other properties, polyurethane sealant is widely used in the fields of automobile sealing, interior decoration bonding and building materials. However, there are still many deficiencies in the currently used polyurethane sealants: ordinary polyurethane sealants composed of carbon, hydrogen, oxygen and other elements are flammable, and have a large heat release rate, high calorific value, and fast flame propagation speed during combustion. , not easy to extinguish; at the same time, a large number of harmful substances produced in the combustion cause great harm to people's life safety and the environment; although the two-component flame-retardant polyurethane sealant can achieve flame-retardant effect, it needs to be The two components are mixed and used. This kind of sealant is highly dep...

AI Technical Summary

Problems solved by technology

However, there are still many deficiencies in the currently used polyurethane sealants: ordinary polyurethane sealants composed of carbon, hydrogen, oxygen and other elements are flammable, and have a large heat release rate, high calorific value, and fast flame propagation speed during combustion. , not easy to extinguish; at the same time, a large number of harmful substances produced in the combustion cause great harm to people's life safety and the environment; although the two-component flame-retardant polyurethane sealant can achieve flame-retardant effect, it needs to be The two components are mixed and used. This kind of sealant is highly dependent on equipment and has high requirements on the use time, resulting in complicated construction; another report of silicone flame-retardant sealant, although it has a certain flame-retardant effect, but because of its low tear strength, it will cause a certain degree of pollution to the periphery of the sealing joint between the sealant and the base material, resulting in a limited range of application