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Polyurethane adhesive is an important part of the rapid […]
Polyurethane adhesive is an important part of the rapidly developing polyurethane resin, with excellent performance, in many areas have been widely used, is one of the eight major synthetic adhesives. Polyurethane adhesives have excellent shear strength and impact resistance properties, suitable for a variety of structural bonding areas, and have excellent flexibility characteristics.
Polyurethane adhesive has excellent rubber properties, can adapt to different thermal expansion coefficient of the substrate bonding, it is formed between the substrate with a soft - hard transition layer, not only strong adhesion, but also has excellent buffer, Earthquake function. Polyurethane adhesives have low temperature and ultra low temperature properties over all other types of adhesives.
PU Adhesive according to the composition of the composition according to the reaction composition can be divided into polyisocyanate adhesive, isocyanate group-containing polyurethane adhesive, hydroxyl polyurethane adhesive and polyurethane resin adhesive.
PU Adhesive according to the use and characteristics of classification can be divided into general-purpose adhesives, food packaging adhesives, shoes with adhesives, paper and plastic composite adhesive, building adhesives, structural adhesives, ultra-low temperature Adhesives, foam adhesives, anaerobic adhesives, conductive adhesives, hot melt adhesives, pressure sensitive adhesives, closed adhesives, waterborne adhesives, and Sealed adhesive and so on.
PU Adhesive contains highly active isocyanate groups and urethane groups, which contain porous materials such as foam, wood, leather, fabric, paper, ceramics and other porous materials and metals, glass, rubber, plastics, etc. The surface of the material has excellent chemical adhesion.
Polyurethane adhesive preparation requires the first synthesis of polyurethane resin, mainly isocyanate and active hydrogen compounds addition reaction and isocyanate reaction, and then with other raw materials.
The diversity of PUR Adhesive is a solution to many bonding problems, and is particularly useful where other types of adhesives can not be bonded or bonded. In the space equipment bonding, cultural relics protection and repair, military industry, stationery, medical and health aspects play an increasingly important role.