The formula of hot melt adhesive is not static, and some raw materials can be used to improve the quality of hot melt adhesive products.
Appropriate addition of lubricants in hot melt adhesives can improve the release performance of the plastic during heating and molding, and improve the surface finish of the product. But this kind of lubricant should not be added too much, so as not to affect the viscosity of the product. Commonly used lubricants include stearic acid, salt, paraffin wax, synthetic wax and so on.
2. Coloring agent
Colorants are used to change the color of hot melt adhesives. The main purpose is to beautify and decorate. About 80% of plastic products are colored to produce the final product.
Adding fillers to the hot melt adhesive can reduce the shrinkage of the hot melt adhesive, increase the viscosity, increase the gap-filling property, and reduce the cost at the same time. Adding too much filler will affect the fluidity of the hot melt adhesive and reduce its adhesion. Common fillers are calcium carbonate, barium sulfate and clay.
4. Flame retardant
The main component of hot melt adhesive is polyurethane resin, which is combustible. We can improve the flame retardancy of hot melt adhesive by adding flame retardant in the middle. Most plastics containing flame retardants are self-extinguishing or burn very slowly. Commonly used flame retardants are antimony dioxide, aluminum boron compounds, tetrachlorophthalic anhydride and so on.