摘要:
A polyurethane suitable for producing leatherlike sheets, which is prepared by the reaction among a diol (A) having a tertiary amino group, a polymer diol (B) having the number-average molecular weight of 500 to 3,000 and selected from the group consisting of polyesters, polycarbonates, polylactones and polyethers, and an organic diisocyanate (C1) each in such an amount that the equivalent ratio of the NCO groups to the OH groups will range from 0.5 to 0.99 to thereby prepare an intermediate diol (D) substantially terminated by OH groups, followed by the reaction among the diol (D), a low-molecular-weight diol (E) and diphenylmethane 4,4'-diisocyanate (C2); and a leatherlike sheet composed of the polyurethane and a fibrous base material, which is soft to the touch, excellent in durability, and dyeable with acid dyes.
摘要:
Die Erfindung betrifft ein Verfahren zur Isolierung von Rohren durch Auftragen eines Polyurethan-Hartschaumstoffs als Isolierschicht und gegebenenfalls einer äußeren Deckschicht nach dem Rotationsgießverfahren, wobei der Polyurethan-Hartschaumstoff durch Umsetzung eines
a) aromatischen Polyisocyanats mit b) einer im Mittel mindestens 3 gegenüber Isocyanaten reaktive Wasserstoffatome aufweisenden organischen Verbindung vom Molekulargewicht 92 bis 1.000 und c) eines aliphatischen, cycloaliphatischen oder aromatischen Polyamins und/oder Polyimins vom Molekulargewicht 32 bis 1.000 als Vernetzer in Gegenwart d) eines Treibmittels sowie gegebenenfalls in Gegenwart von e) an sich bekannten Hilfs- und Zusatzstoffen
erhältlich ist, dadurch gekennzeichnet, daß
f) Verbindungen vom Molekulargewicht 32 bis 1.000 der allgemeinen Formel
in der
n eine ganze Zahl zwischen 2 und 9, bevorzugt 2 und 3, R 1 Wasserstoff, einen C 1 -C 9 -Alkylrest oder einen
R 2 Wasserstoff R 3 und R 4 Wasserstoff oder Methyl
bedeuten, als zusätzliche Vernetzer bei der Herstellung des Polyurethan-Hartschaumstoffs mitverwendet werden.
摘要:
The present invention provides a heat insulating box comprising an outer box and an inner box, the gap therebetween being filled with a hard polyurethane foam prepared by the reaction of polyols and isocyanates in the presence of a foaming agent, in which a part or the whole of the polyols comprises one or more tertiary amino alcohols represented by the following formula (I):
wherein substituents represented by R₁, which may be the same or different, each represents a straight-chain or branched alkylene group having form 2 to 24 carbon atoms, an alicyclic alkylene group, a substituted or unsubstituted cycloalkylene group, a substituted or unsubstituted arylene group, an aralkylene group or -(CH₂CH₂O) p -(CH₂CH₂) q - (in which p represents 0 or a positive integer and q represents a positive integer); substituents represented by R₂, which may be the same or different, each represents a straight-chain or branched alkyl group having from 1 to 24 carbon atoms, an aryl group or an aralkyl group; and the average polymerization degree n represents a positive integer of 1 to 50.
摘要:
Die Erfindung betrifft ein Verfahren zur Erniedrigung von Formaldehydemission aus Polyurethanschaumstoffen durch Zugabe von Aminogruppen aufweisenden Polymeren zu dem Polyurethanschaumstoff, sowie Polyurethanschaumstoffe, enthaltend Aminogruppen aufweisende Polymere mit einem Molekulargewicht von mindestens 500 und einer Aminofunktionalität von mindestens 3, wobei das Verhältnis von Molekulargewicht zu Aminofunktionalität von 40 bis 500 beträgt, in einer Menge von 10 -4 bis weniger als 0,1 Gew.-%, bezogen auf das Gesamtgewicht des Polyurethanschaumstoffs.
摘要:
The present invention relates to a foaming composition of soft polyurethane used for the cushion insert for vehicles and more specifically, to a foaming composition of soft polyurethane which comprises polymerpolyol wherein solid polymer synthesized from acrylonitrile or styrene monomer is grafted or dispersed in polyetherpolyol, polyol wherein polyetherpolyol is mixed, crosslinkage agent, amine catalysts, foaming agent and organic silicon defoaming agent, and which provides greatly improved productivity and reduced inferiority owing to the natural crushing of independent foam cells through chemical method rather than physical method.
摘要:
It is to provide a method for producing a low-fuming rigid polyurethane foam, which is superior in initial activity at low temperature and requires a small amount of a stock liquid. A method for producing a rigid polyurethane foam, which comprises mixing (a) a polyisocyanate component with a polyol component comprising (b) a polyol mixture, (c) a catalyst and (d) a blowing agent, then foaming the mixture;
wherein the polyisocyanate component (a) is polymethylenepolyphenyl polyisocyanate or a modified material thereof; the polyol mixture (b) comprises (b-1) an aromatic polyester polyol and (b-2) an aromatic polyether polyol; the catalyst (c) is at least one metallic catalyst; and the blowing agent (d) is an adduct of a primary or secondary amine compound with carbon dioxide.
摘要:
A polyurethane catalyst comprises a sodium compound, the sodium compound being 1 to 60 wt% of the polyurethane catalyst by the mass percent, and further comprises a tertiary amine and/or pyridine compound. The sodium compound and the tertiary amine and/or pyridine compound achieve a synergistic effect; during the catalysis of the polymerization of isocyanate and polyalcohol, the speed of the polymerization reaction is increased; and the prepared polyurethane material has excellent physical properties, does not contain any heavy metal element at all, is an environment-friendly catalyst, solves the technical problem of ensuring environmental protection, safety and the catalytic efficiency of the polyurethane catalyst, and is particularly applicable to the preparation of polyurethane synthetic leather resin slurry, a polyurethane elastomer (prepolymer), a polyurethane coating, a polyurethane adhesive, a polyurethane composite material, flexible polyurethane foam, and a rigid polyurethane material.