摘要:
A coating composition curable with a vapourized catalyst formed by mixing a poly-isocyanate cross linking agent with an acrylic polymer in a water free solvent, having a good evaporation rate in an acrylic urethane polymer system, said acrylic polymer having a molecular weight below 20,000, preferably less than 10,000 and a content of 15 to 50% by weight of an hydroxy unsaturated monomer and the remaining monomers being selected to provide the final polymer with a glass transition temperature in the range of -40 C to 55 C.
摘要:
Polyurethane resin curable at low temperature and in a short time is prepared by contacting a compound having 1-oxa-3,5-diazine-2,4,6-trione ring as well as isocyanate groups, e.g. a reaction product of an aliphatic, alicyclic or aralkyl polyisocyanate, e.g. hexamethylene diisocyanate and carbon dioxide and a compound having active hydrogen, e.g. polyester polyol, with tert-amine, e.g. trimethylamine present in gaseous phase, at a temperature of 0-100°C. The ratio of the sum of the numbers of the trione ring and the isocyanate group to the number of the active hydrogen in the compound having the same is 0.1 to 10.
摘要:
Polyurethane compound is cured in a short time at about room temperature by contacting a polyurethane compound having 1-oxa-3,5-diazine-24,6-trione ring but no isocyanate group with an amine present in gaseous phase in the presence or absence of such a compound having active hydrogen as polyester polyol. A one-package type urethane resin composition curable at low temperature is made available.
摘要:
The invention relates to a binder based on polyurethane for producing cores and moulds using isocyanates containing urethonimine and/or carbodiimide groups. The invention also relates to a mould material mixture containing said binder, and to a method using said binder for producing moulds.
摘要:
The invention relates to foundry binder systems which use modified polyisocyanates. The modified polyisocyanates are prepared by reacting a polyisocyanate with an aliphatic alcohol having one active hydrogen atom. These modified polyisocyanates, along with a phenolic resole resin, are added to a foundry aggregate to form a foundry mix which is shaped and cured with a gaseous amine curing catalyst.
摘要:
The invention relates to foundry binder systems which use modified polyisocyanates. The modified polyisocyanates are prepared by reacting a polyisocyanate with an aliphatic alcohol having one active hydrogen atom. These modified polyisocyanates, along with a phenolic resole resin, are added to a foundry aggregate to form a foundry mix which is shaped and cured with a gaseous amine curing catalyst.
摘要:
Isocyanatgruppen enthaltende, reaktive Hotmeltsysteme auf Basis von Hydroxypolyolen mit Ester- und/oder Ethergruppierungen der Hydroxylzahl 15 bis 150 und einer mittleren Funktionalität von 1,95 bis 2,2 und Diphenylmethandiisocyanaten in einem Verhältnis von Isocyanatgruppen in den Diphenylmethandiisocyanaten zu Hydroxylgruppen in den Polyolen von 1,4:1 bis 2,5:1, die einen Gehalt von mindestens 70 Gew.-% an 2,4'-Diphenylmethandiisocyanat besitzen, zeichnen sich durch eine niedrige Anfangsviskosität und einer erhöhten Temperaturstabilität aus und eignen sich als Fest-Klebstoffe für die verschiedensten Einsatzgebiete.
摘要:
Polyurethane compound is cured in a short time at about room temperature by contacting a polyurethane compound having 1-oxa-3,5-diazine-24,6-trione ring but no isocyanate group with an amine present in gaseous phase in the presence or absence of such a compound having active hydrogen as polyester polyol. A one-package type urethane resin composition curable at low temperature is made available.