Flame-retardant sealant and preparation method thereof

The flame-retardant sealant is prepared from the following raw materials: bio-based isocyanate, nitrile rubber, basalt fiber, needlebush fiber, bio-polyether polyol, a silane coupling agent, a degradable plasticizer, a biodegradable filler, a curing agent, a catalyst and a defoaming agent. The preparation method of the flame-retardant sealant comprises the following steps: (S1) preparing the biodegradable filler and the degradable plasticizer; (S2) mixing and preparing the main materials; (S3) cooling; and (S4) discharging and packaging. The technical problems that in the prior art, a sealant is insufficient in fireproof performance and not environmentally friendly are effectively solved, and then the technical effects of improving the fireproof performance and being environmentally friendly are achieved. 本发明公开了一种阻燃密封胶，由以下组分的原材料制备而成：生物基异氰酸酯、丁腈橡胶、玄武岩纤维、针叶木纤维、生物聚醚多元醇、硅烷偶联剂、可降解增塑剂、生物降解填料、固化剂、催化剂和消泡剂。该阻燃密封胶的制备方法包括以下步骤：(S1)生物降解填料可降解增塑剂制备、(S2)主料混合制备、(S3)降温以及(S4)出料包装。本发明有效解决了现有技术中的密封胶防火性能不足和对环境不友好的技术问题，进而实现了提高防火性能且对