摘要:
The invention is directed to a tin or bismuth catalyst/mercapto complex which exhibits substantially the same stability and activity after extended periods of storage as upon initial formation. This is achieved by restricting the vehicle for the catalyst complex to one that will not react with the mercapto compound upon extended storage of the catalyst system. These vehicles include aromatic hydrocarbons and terpenes. Ketone vehicles are excluded. Preferred vehicles include toluene, xylene, turpentine and d-limonene. Methods for forming the stabilized catalyst complex are claimed. Polymercapto/polyisocyanate resin formulations are claimed as more stable by the elimination of ketone vehicles. The cure rate of the resin formulations can be retarded by blending with acrylic resins. Stabilized tin catalyst complexes may also be used.
摘要:
Une composition de liaison contient une résine phénolique dans un solvant organique, un polyisocyanate, ledit solvant organique étant sensiblement libre de solvants polaires; procédés de fabrication de formes de fonderie avec ladite composition et procédés de coulée de métaux dans ces formes.
摘要:
L'invention concerne un procédé et un dispositif pour la fabrication d'une couche de polyuréthane de haute qualité optique. Selon le procédé de l'invention, on fabrique la couche par coulée réactive ou pulvérisation réactive d'un mélange réactionnel comprenant un composant isocyanate aliphatique et un composant polyol suivi d'un cycle de polymérisation comprenant le passage de la couche dans une atmosphère catalytique contenant au moins une amine tertiaire.
摘要:
Gegenstand der Erfindung ist ein Verfahren zur Erzeugung einer wasserdurchlässigen Umhüllung auf körnigen, wasserlöslichen Stoffen durch Beschichtung mit einem Kunstharz. Im Verfahren der Erfindung wird eine Beschichtungsmasse verwendet, die ein Polyisocyanat und eine Polyolkomponente aus einem Kondensationsprodukt aus Phenolen und Aldehyden, einem Hydroxylgruppen enthaltenden Weichmacher und gegebenenfalls einem Hydroxylgruppen enthaltenden Verdünnungsmittel umfaßt. Die Beschichtungsmasse wird mit einem Amin als Katalysator bei Raumtemperatur ausgehärtet. Die beschichteten Stoffe können Düngergranulate oder wasserlösliche Trocknungsmittel sein.
摘要:
A method of curing a wet catalyst-curable resin on a substrate in which the substrate is passed through a treating zone provided by a sealed vapor-curing chamber connected to sealed entrance and exit ante chambers at respective ends. The ante chambers are each separated from the vapor-curing chamber by a wall provided with a passage having height-adjustable means to limit passage of gas. The substrate is passed in turn through the entrance chamber where the boundary layer of air is substantially replaced by inert gas, through the entrance chamber into the vapor-curing chamber where it is exposed to the catalyst vapor, and then through the exit chamber where the curing vapor is removed. When a web provides the substrate, a jet of curing vapor is impinged on the web surface as it enters the vapor-curing chamber at an angle and at a velocity effective substantially to remove the barrier layer of gas and permeate the coating. In starting up, the entrance and exit chambers and vapor-curing chamber are purged with inert gas thereby to remove air and on termination of the curing operations the vapor-curing chamber is purged with inert gas to remove curing vapor. Apparatus is disclosed for carrying out the method, featuring height-adjustable doors between the vapor-curing chamber and the entrance and exit chambers. Other features are labyrinth seals and turning vanes adjacent to the passage from one chamber to the other to minimize escape of gas.
摘要:
A coating composition that can be cured with a vaporous amine catalyst, cured by baking at elevated temperatures or can be cured at ambient temperatures which has as the binder A. an acrylic polymer containing hydroxyl groups and amine containing groups and has a weight average molec ular weight of about 2,000-50,000 and B. an aliphatic polyisocyanate