High flame retardant polyisocyanurate rigid foam and preparation method thereof
A polyisocyanurate and rigid foam technology, applied in the field of polyisocyanurate rigid foam, can solve the problems of easy settlement of solid flame retardants, inability to carry out industrial production, poor environmental protection, etc., and achieve fluidity Good, appropriate degree of cross-linking, improved flame retardant performance
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[0065] The raw materials involved in the following examples are:
[0066] Polyester polyol 1: Modified phthalic anhydride polyester polyol, the hydroxyl value is 230-250mgKOH / g, the functionality is 2, the viscosity at 25°C is about 3000mPa.s, and the average molecular weight is 400- 500, product brand HF-8725, purchased from Zhejiang Huafeng New Material Co., Ltd.
[0067] Polyester polyol 2: modified phthalic anhydride type polyester polyol, the hydroxyl value is 230-250mgKOH / g, the functionality is 2, the viscosity at 25°C is about 3000mPa.s, and the average molecular weight is 400- 500, product brand HF-8724, purchased from Zhejiang Huafeng New Materials Co., Ltd.
[0068] Polyester polyol 3: phthalic anhydride type polyester polyol, the hydroxyl value is 190-200mgKOH / g, the functionality is 2, the viscosity at 25°C is about 15000mPa.s, the average molecular weight is 500-600, the product Brand HF-8020, purchased from Zhejiang Huafon New Materials Co., Ltd.
[0069] Pol...
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