Flame-retardant sealant and preparation method thereof

Abstract

The invention discloses a flame-retardant sealant and its preparation method, belonging to the technical field of building functional materials. The flame-retardant sealant, whose raw materials include the following components in parts by weight: MS resin: 100 parts; plasticizer: 20-30 parts; reinforcing filler: 5-15 parts; extender filler: 5-15 parts; silane coupling agent: 2-5 parts; catalyst: 0.1-0.5 parts; flame-retardant system: 150-180 parts; the flame-retardant system is composed of aluminum hydroxide, magnesium hydroxide, and antimony trioxide, and the mass ratio of aluminum hydroxide, antimony trioxide, and magnesium hydroxide is (10-12):(0.8-1.2):(3.5-4.5). Through the compounding of specific types and proportions of flame retardants, the sealant achieves an excellent balance between flame-retardant performance and mechanical properties, especially having high tensile shear strength.