摘要:
Disclosed are bowing agent compositions, foamable compositions, foams, foaming methods and/or foamed articles comprising one or more C2 to C6 fluoroalkenes, more preferably one or more C3 to C5 fluoroalkenes, and even more preferably one or more compounds having Formula I as follows: XCFzR3-z (I) where X is a C1, C2, C3, C4, or C5 unsaturated, substituted or unsubstituted radical, each R is independently Cl, F, Br, I or H, and z is 1 to 3, it generally being preferred that the fluoroalkene of the present invention has at least four (4) halogen substituents, at least three of which are F and even more preferably none of which are Br.
摘要:
Disclosed are bowing agent compositions, foamable compositions, foams, foaming methods and/or foamed articles comprising one or more C2 to C6 fluoroalkenes, more preferably one or more C3 to C5 fluoroalkenes, and even more preferably one or more compounds having Formula I as follows: XCFzR3-z (I) where X is a C1, C2, C3, C4, or C5 unsaturated, substituted or unsubstituted radical, each R is independently Cl, F, Br, I or H, and z is 1 to 3, it generally being preferred that the fluoroalkene of the present invention has at least four (4) halogen substituents, at least three of which are F and even more preferably none of which are Br.
摘要:
Verfahren zur Herstellung von feinzelligen Polyurethan-Hartschaumstoffen durch Umsetzung von
a) Polyisocyanaten mit b) Verbindungen mit mindestens zwei reaktiven Wasserstoffatomen in Gegenwart von c) Treibmitteln, d) Katalysatoren und gegebenenfalls e) Hilfsmitteln und/oder Zusatzstoffen, wobei als Treibmittel c) Perfluorverbindungen verwendet werden, die in mindestens einer der Komponenten a) oder b) emulgiert werden und aus den Komponenten a) bis e) vor der Umsetzung zum Polyurethan Wasser und Luft entfernt werden.
摘要:
Process for the preparation of rigid polyurethane foams comprising the step of reacting an organic polyisocyanate with an isocyanate-reactive material in the presence of a blowing promotor which is an isocyanate-reactive cyclic carbonate or cyclic urea, and in the presence of an inert, insoluble organic liquid and a metal salt catalyst and a polyether polyol of average nominal functionality 2 to 6 and number average equivalent molecular weight between 1000 and 2000.
摘要:
Described is a process for preparing articles made of polyurethane foams, which comprises reacting at least one polyisocyanate with at least one compound containing activated terminal hydrogen atoms in the presence of an expanding medium comprising at least one hydrofluoroalkane and/or perfluoroalkane, and of a product containing at least one amino group and chemically bound or present in free form in one of the two polyurethane reactants, said expanding medium being dissolved in said one of said two polyurethane reactants.
摘要:
Der Hartschaumstoff, insbesondere der weitgehend geschlossenzellige Polyurethan- oder Polyisocyanurat-Schaumstoff, hat eine im wesentlichen homogene Zellstruktur mit einer Zellengröße von bevorzugt als 100 µm Durchmesser und mit im wesentlichen CO₂-Treibgas als Zelleninhalt.
摘要:
Zur lunker- und rißfreien Herstellung von Polyurethanschaumstoffen mit hohen Wärmedämmeigenschaften bringt man, vorzugsweise in einem Begasungsbehälter mittels eines Hohlrührers, Treibmittel, welche eine geringere Wärmeleitfähigkeit als Luft aufweisen, in gasförmigem Zustand zumindest in eine der Reaktionskomponenten, insbesondere in das Polyol, ein.
摘要:
A polyurethane foam, polyisocyanurate foam or polyurea foam is obtainable from the reaction of a mixture comprising A) a compound reactive towards isocyanate ("NCO-reactive compound"); B) a blowing agent selected from the group comprising linear, branched or cyclic C1 to C6 hydrocarbons, linear,branched or cyclic C1 to C6 fluorocarbons, N 2 , O 2 , argon and/or CO 2 , where the blowing agent B) is present in the supercritical or near-critical state; C) a polyisocyanate; D) an amphiphilic isocyanate; and E) optionally a surfactant and F) optionally other auxiliaries and additives. The invention further relates to the production of this polyurethane foam, where the blowing agent is emulsified in the isocyanate component containing amphiphilic isocyanate.