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 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 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 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:
Various embodiments include methods and systems provide a distributed settings registry with access protection definable by application developers. Distributed settings registry may be implemented across different technologies with customizable privileges and the dynamic ability to plug different nodes into the registry tree. The settings registry may exist under a registry interface so the applications invoking the registry need not be concerned with where or how the settings data is stored. Each node in the tree of the registry may define its own privilege requirements and storage technology. Nodes may be “native” (i.e., fully supported within the setting registry system software) or “non-native” (i.e., defined by developers for specific applications).
摘要:
The invention relates to a process for producing polyurethane foams, by frothing and drying mixtures of specific polyurethane dispersions and crosslinkers.