Professional Polymer Technology
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Polyurethane hot melt adhesive and ordinary hot melt ad […]
Polyurethane hot melt adhesive and ordinary hot melt adhesive is the biggest difference is that polyurethane hot melt adhesives are reactive hot melt adhesive, hot melt adhesive in both the rapid bonding performance at the same time, and then the air or the reaction of water in the substrate, 3-5 days after the final formation of high strength, high flexibility, waterproof, temperature resistant polyurethane resin, in the heat will not melt. Although the development and application of reactive polyurethane hot melt adhesives has been 25 years of history, but their advantages in different areas is widely recognized in recent years. Because of their own characteristics, they are described in many areas as a breakthrough in the concept of adhesives.
In general, reactive polyurethane hot melt adhesives have the following characteristics: the traditional bonding, curing speed are quite good, before curing need to have been pressed with the press work, production efficiency is very low, but the polyurethane hot melt curing speed Soon, and efficient. Polyurethane hot melt is a reactive type, after the completion of the coating, with the air or the water in the substrate and then react into the final polyurethane, and then heat will not melt. Temperature adaptation range is usually from -40 degrees Celsius to 120 degrees Celsius, to meet most of the application requirements. And it has a water-resistant soaking, anti-most of the solvent, the characteristics of the erosion of oil.
Since the composition of the polyurethane hot melt is 100% solids, there are no organic ingredients and no drying equipment is required, thus avoiding the environmental problems associated with solvent-borne products and the drying of solvent-based products The energy needed. It will not release any harmful ingredients in the curing process, fully meet people's environmental requirements for home. Compared to high-grade quick-drying and high-grade tape, polyurethane hot melt adhesive costs lower.
Because of the many characteristics of polyurethane hot melt adhesives, it is widely used in all walks of life. For example, the production of composite panels, home decoration, auto parts, arts and crafts, and so on.