High-strength bi-component flame-retardant silicone sealant and preparation method thereof

The invention discloses a high-strength bi-component flame-retardant silicone sealant and a preparation method thereof. The bi-component flame-retardant silicone sealant comprises a first component and a second component. The first component comprises the following raw materials in parts by weight: 100 parts of alpha,omega-dihydroxy polydimethylsiloxane, 25-45 parts of a flame retardant and 30-40 parts of hydrophobic fumed silica R974. The second component comprises the following raw materials in parts by weight: 10 parts of dimethyl silicone oil, 8-20 parts of a cross-linking agent, 2-6 parts of a chain extender, 2-8 parts of a coupling agent and 0.1-1 part of a catalyst. The flame retardant is at least one selected from a silicon resin flame retardant, a nitrogen flame retardant and a phosphorus flame retardant. The silicone sealant is high in room-temperature bonding strength and good in fireproof and flame-retardant performance, and the curing speed of the sealant can be flexibly adjusted. 本发明公开了一种高强度的双组分