Characteristics of waterborne polyurethane adhesive
Aqueous polyurethane adhesive refers to the adhesive formed by dissolving or dispersing polyurethane in water. In practical applications, most waterborne polyurethanes are polyurethane emulsions or dispersions, and less aqueous solutions.
waterborne polyurethane adhesiveIt refers to the adhesive formed by dissolving or dispersing polyurethane in water. In practical applications, most waterborne polyurethanes are polyurethane emulsions or dispersions, and less aqueous solutions.
With water as the basic medium, waterborne polyurethane adhesive has the advantages of non-combustible, low odor, no pollution to the environment, energy saving, convenient operation and processing. And it has the advantages of moderate hardness, good adjustability, low temperature resistance, good flexibility and high bonding strength of polyurethane adhesive.
In addition, compared with solvent-based polyurethane, waterborne polyurethane adhesive has the following characteristics:
1, does not contain NCO, that is, does not contain free isocyanate, completely non-toxic.
2. The viscosity of water-based adhesive is smaller than that of solvent-based adhesive.
3. Waterborne polyurethane glue dries slowly.
4. It can be mixed with various water-based resins to improve performance or reduce costs.
5, the smell is small, the operation is convenient, the residual glue is easy to clean.
Waterborne polyurethane adhesives are widely used, mainly:
1. Leather coated polyurethane material is flexible and wear-resistant, and can be used as a coating agent and repair agent for natural leather and artificial leather.
2. The fabric coating can be used as a coating agent for various fabrics, such as canvas, clothing fabrics, conveyor belt coatings, etc.
3. Fiber treatment agent Cotton fiber and chemical fiber can be impregnated with polyurethane emulsion dilute solution, dehydrated and heat treated to improve hand feeling, wrinkle resistance and shrinkage resistance.
4. Plastic coating Nylon, ABS and other surface coatings.
5, floor coating can be used for stadium coating, indoor wood floor coating, concrete floor coating. Wear resistance, impact resistance, good gloss.
Coatings of other materials, such as paper coatings, automotive interior coatings, etc.
7. Manufacture of various laminated products, including: plywood, food packaging composite plastic films, fabric laminates, laminates of various thin-layer materials, such as soft PVC plastic films or plastic sheets and other materials (such as wood, Fabric, paper, leather, metal) laminated products.
8. Flocking adhesive, artificial leather adhesive, fiber bundle adhesive such as glass fiber, ink adhesive.
9. Bonding of common materials, such as bonding of automotive interior materials and bonding of sneaker.
11. The solid content can be as high as 50%, while the solid content of most solvent-based polyurethane adhesives is about 20%, and the viscosity of solvent-based adhesives increases sharply with the increase of solid content. In contrast, waterborne polyurethane is easier to adjust the formula.
In the past, solvent-based adhesives have been used for the bonding of foam-backed vinyl plastics, fabrics and fiberboards and other hard substrates for automobile interiors, and solvent-based adhesives are one of the most important sources of VOC in automobiles. With the improvement of environmental protection laws and regulations and the enhancement of people's awareness of environmental protection, solvent-based automobile adhesives will gradually be replaced by environment-friendly adhesives, especially the promotion and application of water-based automobile interior adhesives is imperative.
Related News