Professional Polymer Technology
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PUR (Polyurethane Reactive), the Chinese full name for […]
PUR (Polyurethane Reactive), the Chinese full name for the moisture curing reaction polyurethane hot melt adhesive. The main component is the isocyanate ester polyurethane prepolymer. PUR's adhesiveness and toughness (elasticity) can be adjusted, and has excellent bonding strength, temperature resistance, chemical resistance and resistance to aging. In recent years has become one of the important varieties of adhesive industry. Is widely used in packaging, wood processing, automotive, textile, electrical and mechanical, aerospace and other national economic areas.
PUR can be divided into two categories: one is thermoplastic polyurethane hot melt adhesive, the other is reactive PVC hot melt adhesive, colloid heating and air after the reaction of moisture to form a high polymer polymer compounds. Reactive polyoxyethylene hot melt adhesive characteristics can be cured in the environmental conditions, lower than the traditional hot melt adhesive application temperature.
Reactive hot melt adhesive is in the inhibition of chemical reaction conditions, such as hot melt into a fluid, in order to facilitate the coating; two kinds of sticky paste after cooling the adhesive layer to play a bonding effect; after the presence of moisture in the air The moisture and the moisture adhering to the surface of the adherend are reacted with each other to expand the chain to produce a polymer having a high cohesive force, and the adhesion strength, heat resistance, and low temperature resistance are remarkably improved.
Reactive hot melt adhesive has the following applications: automotive structure and parts, such as windshield seal and lamp assembly; textile and footwear industry, such as fabric seam bonding and shoe bonding, with water resistance and soft comfort Advantages; books wireless binding, because the plastic layer flexibility, the book can turn the high degree of flatness, and to prevent reading in the formation of the groove at the binding or the book suddenly closed, more superior than EVA binding; food packaging industry, Quality and good resistance to aging, and does not pollute and corrode the wood; electronic and electrical industry, the rapid curing of the adhesive layer, without the need for plastic, curing shrinkage rate Small, especially suitable for electrical and electronic industry, precision components bonding.