| How to improve the heat resistance of EVA hot melt adhesive
The EVA hot melt adhesive widely used in the market has a softening point (ring and ball) between 70-75 degrees, and its heat resistance is only about 40-60 degrees. In midsummer, if the heat resistance of hot melt adhesive is low, it is very likely to affect some product industries that need to be placed outdoors or overseas export industries. There is a risk of the product falling off, which has certain limitations. Due to heat resistance, it is relatively a weakness for EVA type hot melt adhesives. To improve the heat resistance of EVA hot melt adhesive, the more common methods are the following:  1. Copolymerize with carboxyl compounds with better heat resistance (such as maleic anhydride);2. Blend with grafted ethylene oxide (177℃); 3. Ternary copolymerization of ethylene, vinyl acetate, and acrylate (can be used to maintain high adhesion at high temperatures); 4. Add petroleum resin or rosin phenolic resin or terpene resin (used to improve thermal stability); 5. Adding aromatic hydrocarbons as tackifiers to enhance adhesion; 6. Use phenolic resin to improve heat sealability; 7. Add vinyl toluene copolymer and methyl styrene; The above measures can improve the high-temperature performance of EVA hot melt adhesive and improve the heat resistance of EVA hot melt adhesive. Comprehensively using the above methods, Yide Hot Melt Adhesive has developed high-temperature resistant EVA hot melt adhesives with softening points at 90°C, 100°C, and 120-140°C, which breaks the limitation of low-temperature resistance of EVA hot melt adhesives and caters to different industries. Customer needs. |