The present invention relates to an aromatic polyetherol (b1) obtainable by condensation of aromatic alcohol (b11) and aldehyde (b12) wherein the aromatic alcohol (b11) comprises a mixture, consisting of at least one alkoxylation product (bill) of an aromatic alcohol, the alkoxylation product (b111) having a hydroxyl value of 110 to 500 mg KOH/g and at least one alkylated aromatic alcohol (b112) which may be alkoxylated and wherein the alkyl group is bonded to the aromatic ring, the alkyl group having 4 to 18 carbon atoms, wherein the molar ratio of the alkoxylation product (b111) of the aromatic alcohol and the alkylated aromatic alcohol (b112) is in the range of 5 : 1 to 2 : 1 and the average OH-functionality of the polyetherol (b1) is 2 to 8. Further, the present invention relates to a method of producing a polyurethane rigid foam comprising mixing (a) polyisocyanate, (b) at least one compound having at least two hydrogen atoms reactive towards isocyanates, (c) optionally flame retardant, (d) blowing agent, (e) catalyst and (f) optionally further additives, to form a reaction mixture and reacting the reaction mixture to obtain the polyurethane based rigid foam, wherein the compound reactive towards isocyanates (b) comprises an aromatic polyetherol (b1) and a rigid polyurethane foam obtained by such a method.
本发明涉及一种芳香族
聚醚醇(b1),可通过
芳香族醇(b11)和醛(b12)缩合获得,其中
芳香族醇(b11)包括一种混合物,由至少一种
芳香族醇的烷氧基化产物(bill)组成、烷氧基化产物(b111)的羟基值为 110 至 500 毫克 KOH/克,以及至少一种烷基化芳香 醇(b112),该
芳香醇可被烷氧基化,其中烷基键合在芳香环上,烷基具有 4 至 18 个碳原子,其中
芳香醇的烷氧基化产物(b111)与烷基化
芳香醇(b112)的摩尔比在 5 :1 至 2 : 1 的范围内,
聚醚醇 (b1) 的平均羟基官能度为 2 至 8。此外,本发明还涉及一种生产聚
氨酯硬质泡沫的方法,包括混合 (a) 多
异氰酸酯,(b) 至少一种对
异氰酸酯具有至少两个氢原子反应性的化合物,(c) 可选的阻燃剂,(d) 发泡剂、(e) 催化剂和 (f) 可选的其他添加剂,以形成反应混合物,并使反应混合物反应以获得聚
氨酯基硬质泡沫塑料,其中对
异氰酸酯有反应性的化合物 (b) 包括芳香族
聚醚醇 (b1) 和通过这种方法获得的硬质聚
氨酯泡沫塑料。