How much do you know about polyurethane adhesives?

1. What is Polyurethane Adhesive?

 

Polyurethane adhesives refer to adhesives that contain urethane groups or isocyanate groups in their molecular chains.

 

According to the reaction composition, they can be classified into polyisocyanate adhesives, polyurethane adhesives containing isocyanate groups, hydroxyl-containing polyurethane adhesives and Polyurethane Resin adhesives.

 

According to their uses and characteristics, they can be classified into general-purpose adhesives, food packaging adhesives, shoe adhesives, paper-plastic composite adhesives, construction adhesives, structural adhesives, ultra-low temperature adhesives, foaming adhesives, anaerobic adhesives, conductive adhesives, hot melt adhesives, pressure-sensitive adhesives, sealing adhesives, water-based adhesives and sealing adhesives, etc.

However, regardless of the type of polyurethane adhesive, it is the isocyanate groups in the system that react with substances containing active hydrogen within or outside the system to form polyurethane groups or polyurea, thereby significantly enhancing the strength of the system and achieving the purpose of bonding.

 

What exactly are the characteristics of polyurethane adhesives? And in which fields is it applied?

 

2. Characteristics of polyurethane adhesives

 

(1)It features excellent shear strength and impact resistance, making it suitable for various structural bonding fields.

 

(2)It has good flexibility and shock absorption and vibration damping functions, and can adapt to substrates with different coefficients of thermal expansion.

 

(3)Outstanding low-temperature and ultra-low-temperature performance, which is unmatched by other types of adhesives.

 

(4)Low VOC content, good environmental protection performance, non-flammable.

 

(5)It has excellent chemical resistance and wear resistance, and is suitable for bonding various materials

 

Polyurethane adhesives, with their outstanding performance, are widely used in various fields and are increasingly becoming important synthetic materials in human life. With the gradual expansion of polyurethane applications and the continuous enhancement of human environmental awareness, the current global polyurethane adhesive industry is developing in the direction of adapting to environmental protection, safety and hygiene, and resource recycling. The polyurethane adhesive industry in various countries has also shown a relatively fast growth momentum, and significant progress has been made in technological development.