Abstract
In order to improve the bonding performance, EVA composite hot melt adhesives were prepared by introducing crosslinking agent and silane coupling agent in this paper. A binary EVA resin blend as the base resin with appropriate viscosity and tensile shear strength was selected as hot melt adhesive. The effects of crosslinking agent and silane coupling agent on the properties of ethylene/vinyl acetate (EVA) composite hot melt adhesive were studied. By investigating the preparation and curing conditions of hot melt adhesive and the properties of hot melt adhesive after the introduction of dicumyl peroxide (DCP), the optimum temperature and dosage of DCP and its influence on the properties were determined. It was found that the tensile shear strength of hot melt adhesive increased from 0.247 MPa to 0.726 MPa when 2 phr DCP and 5 phr KH570 were added at the same time. The tensile strength and tensile shear strength of hot melt adhesive are only slightly improved when silicone coupling agents with different functional groups are added to EVA composite hot melt adhesive. However, it was found that excessive silane coupling agent would significantly reduce the tensile strength and shear peel strength of the material.
Highlights
Hot melt adhesive is a plastic, solvent-free adhesive
Three Elvax ethylene/vinyl acetate (EVA) copolymers were chosen for their high melt index, which is good for melt processing, and their appropriate vinyl acetate (VA) content is suitable for making hot melt adhesives
After EVA compound hot melt adhesive was melted at 140 ◦ C for 5 min, it was applied to the surface of the substrate to complete the bonding and the bonded specimen was stored in an oven at 45 ◦ C for 24 h
Summary
Hot melt adhesive is a plastic, solvent-free adhesive. It is a solid at room temperature and melts into viscous liquid after being heated to a certain temperature. The primary component of EVA hot melt adhesive is usually linear ethylene-vinyl acetate copolymer, and it has poor heat resistance and cohesive strength. To improve these shortcomings, it can be used with several modifiers, such as crosslinking agent and coupling agent [12,13,14]. EVA compound was prepared by introducing silane coupling agent and initiating by peroxide to improve bonding strength and low temperature resistance of hot melt adhesive. The modification effects of different organic silane coupling agents were investigated
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