Use of capped surfactants for production of rigid polyurethane foams blown with hydrochlorofluorocarbons
申请人:UNION CARBIDE CHEMICALS & PLASTICS TECHNOLOGY CORPORATION
公开号:EP0533202A1
公开(公告)日:1993-03-24
Composition and process for production of rigid polyurethane and polyisocyanurate foam, and foam made from such composition and by such process. A composition for production of rigid polyurethane foam includes a) an organic compound containing at least 1.8 isocyanate-reactive groups per molecule; b) an organic polyisocyanate selected from the group consisting of: b1) alkyl or cycloalkyl polyisocyanates having at least two isocyanate groups, and in which the alkyl portion contains 2-6 carbon atoms; and b2) aromatic polyisocyanates containing at least 2 isocyanate groups, and at least two six-membered aromatic rings which are fused together or are joined by a carbon-carbon bond or are linked by a divalent linkage selected from the group consisting of alkylene groups of 1-6 carbon atoms, -O-, -CO-, -CO₂-, -S-, and -SO₂-; c) a catalytically effective amount of a catalyst capable of promoting formation of urethane bonds; d) an effective amount of a hydrochlorofluorocarbon blowing agent; and e) a foam stabilizing amount of a hydrolytically stable siloxane-oxyalkylene block copolymer surfactant containing capped hydroxyl groups in the oxyalkylene portion of the molecule. A process for making rigid polyurethane foam involves reacting and foaming such composition.
生产硬质聚氨酯和聚异氰脲酸酯泡沫塑料的组合物和工艺,以及用这种组合物和工艺制作的泡沫塑料。生产硬质聚氨酯泡沫塑料的组合物包括 a) 有机化合物,每个分子至少含有 1.8 个异氰酸酯反应基团的有机化合物; b) 选自以下组别的有机多异氰酸酯:b1) 具有至少两个异氰酸酯基团的烷基或环烷基多异氰酸酯,其中烷基部分含有 2-6 个碳原子;b2) 芳香族多异氰酸酯,含有至少 2 个异氰酸酯基团和至少 2 个六元芳香环,这 些芳香环融合在一起,或通过碳-碳键连接,或通过二价连接,二价连接选自由 1-6 个碳原子的亚烷基、-O-、-CO-、-CO₂-、-S- 和-SO₂- 组成的组;c) 催化有效量的能促进聚氨酯键形成的催化剂; d) 有效量的氯氟烃发泡剂;以及 e) 水解稳定的硅氧烷-氧亚烷基嵌段共聚物表面活性剂的泡沫稳定剂,该表面活性剂在分子的氧亚烷基部分含有封端羟基。制造硬质聚氨酯泡沫塑料的工艺包括对这种组合物进行反应和发泡。