| abstract |
The invention discloses polyisocyanurate foam, wherein the foaming reaction raw materials comprise: 35-48 parts of polyether polyol with the functionality of 3-4, 50-62 parts of polyester polyol with the hydroxyl value of 185-195mgKOH/g and the acid value of 1.5-2mgKOH/g, 180-195 parts of isocyanate, 3.5-4.2 parts of trimerization catalyst, 26-32 parts of foaming agent, 12-17 parts of flame retardant and 2.5-3.1 parts of foam stabilizer; the preparation of the polyester polyol comprises: adding 130 parts by weight of diethylene glycol 110-; the polyisocyanurate foam of the invention has good flame retardance and heat preservation simultaneously. |