| 摘要 |
A method of producing a polyurethane foam is disclosed wherein the method comprises A method of producing a polyurethane foam comprising: A) preparing a mixture comprising: (1) a polyether polyol containing an average of more than two hydroxyl groups per molecule, (2) an organic polyisocyanate, (3) at least one catalyst for the production of polyurethane foams, (4) water, and (5) a surfactant; wherein the surfactant comprises a silicone/polyether composition of the formula: R-Si(CH3)20-{Si(CH3)2O-}x-{SiCH3R<1>O-}a- {SiCH3R<2>0-}b-{SiCH3R<3>0-}c-{SiCH3R<4>0-}d-Si(CH3) 2-R; or the formula: R-Si(CH3)2O-{SiCh3RO}m-(SiCH3{O-(SiCH3RO)m-Si(CH3)2R}O)n-{SiCH3RO}m-Si(CH3)2-R wherein R<1>, R<2 >and R<3> are polyalkylene oxide polyethers of the formula -B-CnH2nO-(C2H4O)e-(C3H6O)f(C4H8O)gZ, where R<1> has a blend average molecular weight in the range of from about 3000 to about 6000 grams/mole and ethylene oxide is from about 20 to about 60 weight percent of the alkylene oxide content of the polyether; RZ has a blend average molecular weight in the range of from about 800 to about 2900 and ethylene oxide is from about 20 to about 60 weight percent of the alkylene oxide content of the polyether; R3 has a blend average molecular weight in the range of from about 130 to about 800 grams/mole and ethylene oxide is from 0 to about 75 weight percent of the alkylene oxide content of the polyether; R4 is an substituted or unsubstituted alkyl, alkaryl, or aryl group of C,to C12; B is derived from a moiety capable of undergoing hydrosilation; Z is selected from the group consisting of hydrogen, C1-C8 alkyl or aralkyl moieties, -C(O)Z<1>, -C(O)OZ<1>, and -C(O)NIHZ<1>, where Z' represents mono-functional C1-Cg8alkyl or aryl moieties; each R is independently selected from the group consisting of R<1>, R<2>, R<3>, and R<4>; x is 40 to 150; y is 5 to 40 and equals a + b + c + d, where b or c, but not both, may be 0, d/(a + b +c) = 0 to 1, and a+b>0; x/Y <= 10; m = 10 to 100; n <= 4; and e, f, and g are defined by the molecular weight required by the polyether; with the proviso that the total ethylene content of the surfactant structure is less than 37% by weight; and B) blowing the polyurethane foam with a pressurized inert gas.
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