Formulation technology - what is polyurethane hot melt adhesive.

Hot-melt adhesive has the advantages of fast bonding speed, environmental protection, simple bonding process, and good bonding strength and flexibility. Therefore, hot-melt adhesive for book wireless binding, hot-melt adhesive for packaging and sealing, and shoemaking have emerged. , textile hot melt adhesives and other products, and in recent years, there have been new developments in terms of variety and performance.

Most hot melt adhesives are made of ethylene-vinyl acetate (EVA), polyester, polyamide and other hot melt resins. Due to the poor strength and elasticity of EVA and polyester hot melt adhesives, they cannot withstand too much external force. In addition, due to the high melting point and hardness of polyamide hot-melt adhesives, it is limited in use.

The hot-melt polyurethane adhesive mainly uses the hydrogen bond in the composition to undergo physical crosslinking, so that the polyurethane hot-melt adhesive has excellent elasticity and strength. The hot-melt polyurethane adhesive will lose its hydrogen bond after being heated, become a molten viscous liquid, and return to its original physical properties after cooling. Therefore, polyurethane hot-melt adhesive has the characteristics of high bonding strength, solvent resistance, wear resistance, etc. It has high reliability in use, good chemical and physical uniformity, simple bonding process (reducing production costs), and less waste (unused The adhesive can be stored for later use), there is no mixing problem, and the adhesive can achieve the best physical properties. In addition, because the hot melt adhesive does not use organic solvents, the production site will not be polluted, so it is welcomed by users, and can be widely used in the bonding of various materials, especially for the bonding of fabrics.

Polyurethane hot melt adhesives can be divided into two categories: one is thermoplastic polyurethane elastomer hot melt adhesives, and the other is reactive polyurethane hot melt adhesives. The latter is divided into closed type and moisture curing hot melt type. Sealed type, because the dissociation temperature of the sealant is as high as 100 ℃ or more, it will cause bubbles in the adhesive layer, and it is only used for maintenance treatment. The moisture-curing hot-melt polyurethane adhesive is a one-component, solvent-free type, which complies with environmental protection regulations, is easy to use, and has a performance comparable to solvent-based-reactive type, so it has a good development prospect.

PURking PUR moisture curing reactive hot-melt adhesive has excellent performance. From the automotive interior to the furniture customization industry, it can provide high-standard and high-quality hot-melt adhesives. We look forward to negotiating and cooperating with you.