摘要:
The invention relates to innovative compositions containing polyisocyanates containing allophanate groups and polyamines, preferably aromatic diamines, and optionally further polyisocyanates, preferably polyisocyanates containing uretdione groups, and also their use for producing quick-curing polyurea coatings.
摘要:
The present invention relates to two-component coating systems for producing flexible coatings. The coating systems comprise polyurethane prepolymers with allophanate structures and also amino-functional polyaspartic esters as curing agents.
摘要:
The present invention relates to two-component coating systems for producing flexible coatings. The coating systems comprise polyurethane prepolymers with allophanate structures and also amino-functional polyaspartic esters as curing agents.
摘要:
A process for preparing polyisocyanate prepolymers containing allophanate structural units that includes reacting a) one or more polyisocyanates with b) one or more polyetherpolyols containing less than or equal to 0.02 milliequivalent of unsaturated end groups per gram of polyol and having a polydispersity of from 1.0 to 1.5 and/or an OH functionality of greater than or equal to 1.9 to provide an NCO-functional polyurethane prepolymer containing urethane groups that are partly or fully allophanatized by further reaction with c) polyisocyanates, which may be different from those from a), and d) catalysts and optionally adding e) acidic additives before, during and/or after the allophanatization. The polyisocyanate prepolymers can be used to produce coatings, adhesive bonds and/or seals. The coatings include one or more of the polyisocyanate prepolymers, and at least one diol or polyol and/or at least one linear and/or cyclic, aliphatic, araliphatic and/or aromatic diamine or polyamine.
摘要:
The invention relates to innovative compositions containing polyisocyanates containing allophanate groups and polyamines, preferably aromatic diamines, and optionally further polyisocyanates, preferably polyisocyanates containing uretdione groups, and also their use for producing quick-curing polyurea coatings.
摘要:
A process for preparing polyisocyanate prepolymers containing allophanate structural units that includes reacting a) one or more polyisocyanates with b) one or more polyetherpolyols containing less than or equal to 0.02 milliequivalent of unsaturated end groups per gram of polyol and having a polydispersity of from 1.0 to 1.5 and/or an OH functionality of greater than or equal to 1.9 to provide an NCO-functional polyurethane prepolymer containing urethane groups that are partly or fully allophanatized by further reaction with c) polyisocyanates, which may be different from those from a), and d) catalysts and optionally adding e) acidic additives before, during and/or after the allophanatization. The polyisocyanate prepolymers can be used to produce coatings, adhesive bonds and/or seals. The coatings include one or more of the polyisocyanate prepolymers, and at least one diol or polyol and/or at least one linear and/or cyclic, aliphatic, araliphatic and/or aromatic diamine or polyamine.
摘要:
A method of preparing and stabilizing polyisocyanates that contain allophanate groups that are based on aliphatic and/or cycloaliphatic polyisocyanates. The method includes reacting a) one or more aliphatic and/or cycloaliphatic polyisocyanates with b) one or more polyhydroxy compounds to give an NCO-functional polyurethane prepolymer whose resultant urethane groups are reacted further with c) aliphatic and/or cycloaliphatic polyisocyanates, which may be different from those of a), and d) in the presence of catalysts and are thereby fully or partly allophanatized, and before, during and/or after the allophanatization, adding e) acidic additives. The polyisocyanates can be used in coatings, adhesive bonds or seals. Such coatings include the stabilized polyisocyanate prepolymers, at least one diol or polyol and/or at least one linear and/or cyclic, aliphatic, araliphatic and/or aromatic diamine or polyamine. The coatings can be used to coat substrates.
摘要:
A process for preparing polyisocyanate prepolymers containing allophanate structural units and prepolymers prepared thereby. The process includes the steps of reacting a) one or more aliphatic and/or cycloaliphatic polyisocyanates with b) one or more polyhydroxy compounds to give an NCO-functional polyurethane prepolymer, whose resultant urethane groups are fully or partly allophanatized; reacting the prepolymer with c) polyisocyanates, which may be different from those of a), and using d) zinc(II) compounds as catalysts. The prepolymers can be used to produce coatings, adhesive bonds and/or seals. The coatings can include A) one or more of the prepolymers and B) at least one diol or polyol and/or C) at least one linear and/or cyclic, aliphatic, araliphatic and/or aromatic diamine or polyamine. The coatings can be used to coat substrates.
摘要:
The invention relates to coating systems for producing fast-drying flexible coatings which are based on aromatic allophanate group-containing prepolymers and aliphatic polyisocyanates and aminofunctional polyaspartic esters as the curing agents.
摘要:
A two-component coating system, containing (A) a polyisocyanate prepolymer having polyether groups bonded through allophanate groups, and (B) a mixture of polyamines in which (B1) at least 75 mol % of all NH groups originate from an amino-functional polyaspartic acid ester of the general formula (I): wherein, X represents an n-valent organic radical which is obtained by removing the primary amino groups from an n-valent polyamine; R1 and R2 independently of one another, represent organic radicals that are inert towards isocyanate groups under the reaction conditions; and n represents an integer of at least 2; and (B2) not more than 25 mol % of all NH groups originate from a cycloaliphatic diamine or aromatic diamine, and also (C) optionally a further polyisocyanate.