The present invention provides a waterproof plastic foam such as waterproof polyurethane foam which can keep the inherent properties of the foam and exhibit low gas permeability and water absorption, excellent water-sealing properties and hence a stable waterproofness. A waterproof plastic foam obtained by a process which comprises foaming a foamable composition comprising a polyisocyanate, a compound containing at least two active hydrogen groups, a compound containing at least one ester bond, a catalyst, a blowing agent and a foam stabilizer, and then curing the foam is described, wherein the compound containing at least one ester bond is a product of the reaction of any one of a monocarboxylic acid having not less than 9 carbon atoms, an aliphatic dicarboxylic acid having not less than 8 carbon atoms and an alicyclic dicarboxylic acid having not less than 8 carbon atoms with a monoalcohol having not less than 10 carbon atoms, and the compound containing at least one ester bond is incorporated in an amount of from 7 to 100 parts by weight based on 100 parts by weight of the compound containing at least two active hydrogen groups. A waterproof plastic foam obtained by a process which comprises foaming a foamable composition comprising a polyisocyanate, a compound containing at least two active hydrogen groups, a compound containing ester bonds, a catalyst, a blowing agent and a foam stabilizer, and then curing the foam is also described, wherein the compound containing ester bonds is made of oleic acid and one component selected from the group consisting of butadiene polyol, adduct of bisphenol A with propylene oxides and castor oil, and the compound containing ester bonds is incorporated in an amount of from 7 to 100 parts by weight based on 100 parts by weight of the compound containing at least two active hydrogen groups.
本发明提供了一种防
水塑料泡沫塑料,如防
水聚
氨酯泡沫塑料,它能保持泡沫塑料的固有特性,并表现出低气体渗透性和低吸
水性、优异的
水封性能,因而具有稳定的防
水性。本发明描述了一种防
水塑料泡沫,其工艺包括发泡由多
异氰酸酯、含有至少两个活泼氢基的化合物、含有至少一个酯键的化合物、催化剂、发泡剂和泡沫稳定剂组成的可发泡组合物,然后固化泡沫,其中含有至少一个酯键的化合物是具有不少于 9 个碳原子的单
羧酸中任何一种的反应产物、不小于 8 个碳原子的脂肪族二
羧酸和不小于 8 个碳原子的脂环族二
羧酸与不小于 10 个碳原子的一元醇中的任意一种反应的产物,且含有至少一个酯键的化合物的掺入量为 7 至 100 重量份(以含有至少两个活性氢基的化合物的 100 重量份计)。还描述了一种防
水塑料泡沫,其工艺包括发泡一种可发泡组合物,该组合物包括多
异氰酸酯、含有至少两个活性氢基的化合物、含有酯键的化合物、催化剂、发泡剂和泡沫稳定剂,然后固化泡沫、其中,含酯键的化合物是由
油酸和一种选自
丁二烯多元醇、双
酚 A 与氧化
丙烯的加合物和
蓖麻油组成的组的组分制成,含酯键的化合物的加入量为 7 至 100 重量份(以 100 重量份含至少两个活性氢基的化合物为基准)。