Polyurethane Adhesive For Automobiles
Polyurethane adhesive for automobiles
A large number of lightweight metals, composites and plastics have been introduced into the new automotive construction, resulting in continued growth in automotive adhesives and sealants. The most widely used polyurethane adhesives in automobiles are mainly one-component moisture-curing polyurethane sealant for windshield; structural adhesive for bonding glass fiber reinforced plastic and sheet molding compound, and two-component polyurethane adhesive for interior parts. And water-based polyurethane glue. Automotive interior parts are also an area of increased adhesive usage.
For a long period of time in the past, China's automobile manufacturing industry has been importing polyurethane windshield glue from abroad. Until the "Eighth Five-Year Plan" period, the development of this rubber was included in the national key scientific and technological projects. A wide range of waterborne polyurethane adhesives used in automobiles are adhesives formed by dissolving polyurethane in water or dispersed in water.
Most of the waterborne polyurethanes are linear thermoplastic polyurethanes. Because the coating film is not crosslinked and the molecular weight is low, the water resistance, solvent resistance, and film strength are still poor. It must be modified to improve its performance. . The miscellaneous and dispersion of polyester and acrylic acid is combined with uretdione and isocyanurate to prepare automotive refinish varnish, which does not require high-speed stirring equipment, is easy to mix together, and has good adhesion properties.