What is the difference between hot melt glue and pur glue
The main difference between hot melt adhesive and pur glue is the use of equipment, and the storage environment and method. PUR glue must be isolated from the air and will react with the moisture in the air. PUR hot melt adhesive is now a popular adhesive and is widely used in various fields.
Hot melt adhesive is a wide range. PUR is one of hot melt adhesives. Most hot melt adhesives are heated and can be reheated after lamination. It is reversible, while PUR is a moisture reactive hot melt. Glue, heating operation, will react with the moisture in the air after bonding, and it is irreversible after the reaction (that is, heating will not melt). So PUR is more resistant to high temperature and low temperature.
Features of pur glue:
(1) Solvent-free, one-component type. Unlike solvent-based adhesives, which requires a drying process, there is no problem of environmental pollution and poisoning due to the existence of solvents. The bonding process is simple and can be applied by roller coating or spraying, and is suitable for various automated assembly lines.
(2) It can be glued at low temperature. The melting temperature of the polyurethane reactive hot-melt adhesive is lower than the service temperature of the general hot-melt adhesive (170-200 ℃), and it can be glued at low temperature and can be used at 120-150 ℃. Save energy and reduce the corrosiveness of the glue applicator, especially suitable for bonding heat-sensitive materials (such as plastics, etc.).
(3) Good operability. The two adherends can be fixed in a short period of time, so the assembly can be quickly transferred to the next processing process to improve work efficiency.
