What is waterborne polyurethane adhesive?

2025,07,04

Waterborne Polyurethane Adhesive refers to an adhesive formed by dissolving or dispersing polyurethane in water. Waterborne polyurethane adhesive has the advantages of adjustable hardness, low temperature resistance, good flexibility and high bonding strength, and can bond various materials such as metals and nonmetals. Waterborne polyurethane adhesive has the characteristics of low VOC content, low or no environmental pollution and non-flammability, which is the key development direction of polyurethane adhesive. With the strengthening of people's awareness of safety and environmental protection, the research of waterborne polyurethane adhesive has developed rapidly. Waterborne polyurethane adhesive refers to the adhesive formed by dissolving or dispersing polyurethane in water. Compared with solvent-borne, it has the advantages of solvent-free, pollution-free, good film-forming, strong adhesion and easy mixing with other polymers, especially emulsion polymers, which is beneficial to modification.

Characteristics of Waterborne Polyurethane Adhesive Materials

Besides maintaining the advantages of polyurethane, waterborne polyurethane adhesive has its unique features compared with solvent-based polyurethane adhesive.

(1) Taking water as the medium, it is non-toxic, non-flammable, pollution-free, non-hazardous, with little odor, which does not pollute the environment and saves energy. It is suitable for substrates that are easily eroded by organic solvents.

(2)The viscosity is low, and it can be adjusted by water-soluble thickener and water, which is convenient to operate and the residual glue is easy to clean.

(3)It can be mixed with a variety of water-based resins, which is beneficial to improve performance and reduce cost, but attention should be paid to ionic properties and acidity and alkalinity to prevent coagulation.

(4) Containing carboxyl, hydroxyl and other groups, it can participate in the reaction under suitable conditions, resulting in crosslinking and improving performance.

(5) Poor wettability to nonpolar substrates.

(6) Slow drying speed, low initial viscosity and poor water resistance.

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