Double-wall heat shrink tubing portions of the substrate with a conventional adhesive shrink tube material is the same, all the PE, double-wall heat shrink tubing glue reason beyond the ordinary heat-shrinkable tube with sealing performance is derived from the double wall heat shrink tube wall of the hot melt adhesive, double-wall heat-shrinkable tube is baked at the same time, the inner wall will form a molten hot melt adhesive has a flowability, the base material may be filled with all the gaps between the object being protected, . EVA hot melt adhesive we discussed above, below and then double-wall heat shrink tubing to talk about PUR hot melt adhesive inner wall being used.
PUR hot melt adhesive does not contain water and solvents, solid content 100%, is a high performance environmentally friendly adhesives, it was adapted to the environment at home and abroad more and more attention needs. Reactive PUR hot melt adhesives compared with ordinary hot melt adhesive, with excellent overall performance. It combines a common solvent-free hot melt adhesives, early high viscosity, location and other characteristics of rapid assembly, but also has the unique adhesives reactive liquid water, heat, cold resistance, creep resistance and dielectric properties. Its sizing temperature (120 ℃) is lower than the ordinary hot-melt adhesive (150-180 ℃), can be used for bonding certain plastics, composites, much favored by modern automated assembly industry.
PUR hot melt adhesive as compared with other types of hot melt adhesives, there is a significant feature that it is usually in addition to the substrate body, no additives. This is because the polyurethane resin matrix, the wettability, melt viscosity, bonding strength, etc., has a good overall performance. Therefore, usually after a polyurethane resin obtained by synthesis can be directly used as hot melt adhesives for use.
PUR hot melt adhesive from being successfully developed 20 years ago from the much-loved, has been more and more development in Europe, the United States and Japan and other industrialized nations. While PUR glue is currently in China is still in its infancy, but already there are more and more customers recognize the advantages of PUR glue, but due to technical reasons, severely limits the development of domestic PUR glue, the current PUR glue is mainly dependent on imports, when the country can produce high-grade PUR glue, PUR glue domestic applications will truly massive development.
These are some simple introduction PUR hot melt adhesive.
