What is polyurethane adhesive?

Polyurethane Adhesive, a chemical widely used in modern industry, has become an important pillar of adhesive industry because of its unique properties and wide application fields. Next, the composition, characteristics, application and future development trend of polyurethane adhesive will be discussed in detail.

Polyurethane adhesive is mainly composed of ammonium isocyanate, polyol, polyether containing alkyl group, polyester and epoxy resin, filler, catalyst and solvent. These components endow polyurethane adhesive with high reactivity, curing at room temperature and excellent impact resistance.

1. Excellent adhesion: The urethane group (-NHCOO-) or isocyanate group (-NCO) in the molecular chain of polyurethane adhesive has high chemical activity and can form chemical bonds with materials containing active hydrogen, so it has excellent adhesion to porous materials such as foam plastic, wood, leather, fabric, paper, ceramics, and materials with smooth surfaces such as metal, glass, rubber and plastic.

2. Good toughness: Polyurethane adhesive has good toughness, can adapt to the bonding of substrates with different thermal expansion coefficients, and forms an adhesive layer with a soft-hard transition layer, which not only has strong adhesion, but also has excellent cushioning and shock absorption functions.

3. Excellent low temperature resistance: Polyurethane adhesive can still maintain high peel strength at very low temperature, and its shear strength increases greatly with the decrease of temperature, so it has excellent low temperature resistance.

4. adjustability: the performance of polyurethane adhesive can be adjusted by changing the proportion of components in the formula to meet the needs of different applications.

Polyurethane adhesive is widely used in various fields because of its excellent properties. Polyurethane adhesive plays an important role in the bonding between composite materials and metal frames, automobile bonding and caulking, and glass fiber reinforced plastics and metal bonding. In addition, polyurethane adhesives can also be used in sealing adhesives, reactive hot melt adhesives, subprime adhesives and other fields, as well as aerospace, electronic and electrical, metal materials, packaging materials, shipbuilding, textiles, rubber, plastics, ceramics, construction, automobiles and other industries.

With the progress of science and technology and the improvement of environmental awareness, the polyurethane adhesive industry is facing new development opportunities and challenges. On the one hand, environmental protection polyurethane adhesive will become an important direction of future development. By improving production technology and formula, VOC content will be reduced and environmental pollution will be reduced. On the other hand, the demand for customized polyurethane adhesives will continue to increase to meet the special needs of different industries and fields for adhesive properties.

 

In a word, polyurethane adhesive plays an important role in modern industry because of its unique properties and wide application fields. In the future, with the continuous progress of technology and the changing market demand, the polyurethane adhesive industry will usher in a broader development prospect.