Application and development of polyurethane adhesive

Release time:

2024-08-28

Polyurethane adhesive is an important component of the rapidly developing polyurethane resin. It has excellent performance and has been widely used in many aspects. It is one of the eight important synthetic adhesives; Polyurethane adhesive has excellent shear resistance. Shear strength and impact resistance, suitable for a variety of structural bonding areas, and has excellent flexibility.

Polyurethane adhesive has excellent rubber properties and can adapt to the adhesion of substrates with different thermal expansion coefficients. It forms a soft-hard transition layer between the substrate, which not only has a strong adhesive force, but also has excellent buffering and reducibility. Shock function. The low and ultra-low temperature performance of polyurethane adhesives exceeds that of all other types of adhesives; Waterborne polyurethane adhesives have low VOC content, low or no environmental pollution, non-flammable, etc., which is the key development direction of polyurethane adhesives.

In addition to various auxiliaries and durability auxiliaries, many components of polyurethane include polyisocyanates, polyols, auxiliaries, etc. In addition, in order to improve hardness or other properties, while reducing product production costs, fillers are added in the preparation process, such as polyurethane coatings used by the company, and thixotropic agents are used in sealants.

A good positioning process, an important condition is that the substrate table on the surface of the necessary treatment. For example, the surface of some metal and plastic substrates is often polluted by sweat, oil, dust, etc., the cleaning process must be carried out for a long time, and the smooth surface of the substrate must be roughened to increase the glue and base. Contact area of the material. In addition to these most basic treatments, special substrates require special treatment. For example, certain metal surfaces require rust removal, degreasing, and slight corrosion before being used in polyurethane adhesives.

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