Characteristics and composition of hot melt adhesive

Characteristics and composition of hot melt adhesive
Characteristics of hot melt adhesive
(1) bonded quickly usually from the glue to cement cooling, only tens of seconds, or even a few seconds.
(2) adhesive range wide for many materials, even to recognized difficult adhesive material (such as a polyolefin, waxed paper, carbon paper, etc.) can also were bonding, especially the use of hot melt adhesive bonding joints can be subjected to 105 - 106 times more than the bending and cracking.
(3) can be repeated heating, multiple bonding.
(4) stable and easy to store and transport.
(5) low cost hot melt adhesive without solvent consumption and avoid the due to the presence of the solvent, the adherends are deformed, dislocation and shrinkage defects, to reduce costs, improve product quality, however, hot melt adhesive also exist some disadvantages is mainly the heat resistance and adhesive strength is low, not suitable as a structural adhesive used due to the generally higher melt viscosity of hot melt adhesive, the bonding materials, less infiltrative usually requires the bonding pressure, in order to improve the bonding strength; also hot melt adhesive in use need special equipment, such as glue hot melt machine gun and so on some extent limits the its scope of application.
Hot melt adhesive composition
(1) the basic polymer thermal plastic polymer such as: ethylene vinyl acetate copolymer (EVA), styrene butadiene styrene copolymer (SBS), styrene of isobutylene and styrene (SIS) block copolymers, etc. can as a basic polymer of hot-melt adhesives and decided to the basic properties of hot melt adhesive.
(2) increase the viscosity of resin C5 petroleum resin, terpene resin, phenolic resin, terpene phenolic resin, rosin, modified rosin and increase the initial adhesive force and permanent bonding strength, reduce the hot melt adhesive melt viscosity increased by bonding materials, infiltration, and improve the operating performance.
(3) melt viscosity regulator common viscosity modifier is wax, such as paraffin wax, microcrystalline wax, polyethylene wax role is to regulate the melt viscosity, liquidity improvement, invasive, increase the surface hardness, accelerate the curing rate and prevent agglomeration of hot melt adhesive.
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