Room-temperature moisture-curable single-component flame-retardant polyurethane sealant

Abstract

The invention discloses a room-temperature moisture-curable single-component flame-retardant polyurethane sealant and a preparation method thereof. The sealant is prepared from the following raw materials in parts by weight: 30-55 parts of liquid polyether type polyurethane pre-polymer base stock, 10-30 parts of flame-retardant plasticizer, 0.1-1 part of silane coupling agent, 15-30 parts of flame-retardant powder, 10-30 parts of filler, 0.01-0.05 part of catalyst and 0.2-3 parts of methyl benzenesulfonyl isocyanate, wherein the liquid polyether type polyurethane pre-polymer base stock is prepared from the following raw materials in parts by weight: 32.8-57.64 parts of common polyether glycol, 28.82-54.67 parts of flame-retardant polyether glycol, 12.51-13.53 parts of polyisocyanates, and 0.01 part of catalyst. The room-temperature moisture-curable single-component flame-retardant polyurethane sealant is excellent in physical performance, thixotropic property and flame-retardant performance, and convenient for construction.

Description

Technical field [0001] The invention relates to a sealant, which is a room temperature moisture curing single-component flame-retardant polyurethane sealant and a preparation method thereof. Background technique [0002] Polyurethane sealant is widely used in automobile sealing, interior bonding and building materials because of its good physical properties. However, the currently used polyurethane sealants still have many shortcomings: 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 during combustion. , It is not easy to extinguish; at the same time, a large number of harmful substances produced during combustion cause great harm to people’s life safety and the environment; although the two-component flame-retardant polyurethane sealant can achieve the flame-retardant effect, it needs to be The two components are mixed and used. This kind o...

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