Hot melt adhesive formula analysis, hot melt adhesive testing

Hot melt adhesives are plastic adhesives whose physical state changes with temperature within a specific temperature range, while their chemical properties remain unchanged. They are non-toxic, tasteless, high viscosity, fast curing, smooth running, and environmentally friendly chemical products. They are solid at room temperature, and when heated to a specific temperature, they turn into liquid and viscous liquids. Hot melt adhesives are involved in packaging, transportation, production processes, and apparel. In these industries, hot melt adhesives play a massive role because the bonding strength of hot melt adhesives is relatively large, the bonding speed is also relatively fast, and it is also straightforward to use. The following micro-spectrum is for you to introduce the knowledge of hot melt adhesive testing.

1. Hot melt adhesive formula analysis
Hot melt adhesive composition performance.
Basic resin: determine the bonding ability and bond strength.
Viscosity regulator: increase the fluidity of the gel, and adjust the solidification speed.
Tackifier: improve bonding performance, improve bonding strength.
Anti-oxidants: prevent premature aging of hot melt adhesives.
Pigment: to provide different colors of products.

2. Hot melt adhesive testing
Hot melt adhesive testing items
Performance testing: curing speed, softening point, thermal stability, flexibility, heat resistance, viscosity, composition analysis, dielectric constant, tensile strength, formulation analysis, brittleness temperature, chemical performance testing, flame retardant detection, density, ph value, fracture elongation, peel strength, reliability testing, volume resistance, etc.

Toxic and harmful substances detection: heavy metals, free formaldehyde, benzene, toluene, methanol, non-volatile content, chlorinated hydrocarbons, xylene, ash substances, etc.

Hot melt adhesive testing standards
• GB/T 16998-1997 hot melt adhesives thermal stability determination;
• ASTM D4498-2007 test method for hot melt adhesive thermal interruption temperature during shear;
• ASTM D4499-2007 test method for thermal stability of hot melt adhesives;
• GB/T 28692-2012 General test method for hot melt adhesive stapling equipment for printing machinery;
• GB/T 36236-2018 hot melt adhesive labeling machine;

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Reprinted from Purking Adhesive - “Hot melt adhesive formula analysis, hot melt adhesive testing”