What material is hot melt adhesive made of? What are the main components of hot melt adhesive?
1. Polymer matrix
The main component of hot melt adhesive plays a key role in the performance of hot melt adhesive.
Main types: ethylene and its copolymers, polyolefins, polyesters, polyurethanes, polyamides, styrene and its block copolymers, and other polymers.
Influence on the properties of hot melt adhesives: reaction in bonding strength, melt index, softening point, viscosity, flexibility, curing speed, thermal stability.
2. Tackifier
Improves wettability and initial tack.
Main types: rosin and its derivatives, terpene and modified terpene resin, petroleum resin.
Influence on the performance of hot melt adhesive: the reaction is in adhesive wettability ↑, initial viscosity ↑, adhesive strength ↑, viscosity ↓, heat resistance, exposure time.
3. Viscosity modifier
Increase the fluidity of the colloid and adjust the solidification speed to achieve the purpose of fast bonding and firmness.
Main types: paraffin wax, microcrystalline wax, synthetic wax.
Effects on hot melt adhesive properties: reaction in melt index↑, fluidity↑, exposure time↓, creep resistance, flexibility, melting speed, self-adhesive properties, cohesive strength↓, bond strength↓
4. Antioxidants
Improve the thermal stability of hot melt adhesives.
Main types: phenol and its derivatives.
Influence on the performance of hot melt adhesive: reaction in thermal aging speed↓, viscosity stability↑, color stability↑, bond strength
5. Plasticizer
Improve the brittleness and flexibility of hot melt adhesives.
Main types: aliphatic mineral oil, dioctyl phthalate, dibutyl phthalate, liquid paraffin.
Influence on the properties of hot melt adhesive: the reaction is in hardness↓, modulus↓, brittleness↓, elongation↑, flexibility↑, flexibility↑
6. Filler
Improve performance and reduce costs.
Influence on the performance of hot melt adhesive: reaction in heat resistance, heat capacity, shrinkage, permeability, self-adhesion, fluidity, viscosity, crystallization speed, bonding strength, peel strength, etc.
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