EVA 625

Ethylene-vinyl acetate copolymer, EVA for short. General vinyl acetate (VA) content in 5%-40%, compared with polyethylene PE, EVA due to the introduction of vinyl acetate monomer in the molecular chain, thereby reducing the high degree of crystallization, improve toughness, impact resistance, filler phase compatibility and thermal sealing performance, is widely used in foam footwear, functional shed film, packaging mold, hot melt adhesive, wire and cable and toys and other fields.   EVA products with 5% to 10% ethylene acetate content are elastic films. EVA with ethylene acetate content of 20~28% is mainly used for hot melt adhesives and coating products; Ethylene acetate content in 5%~45%, the main products for film (including agricultural film) and sheet, injection molding, molding products, foam products, hot melt adhesives.   1. Foam shoe material. Shoe material is the most important application field of EVA resin in China. In the EVA resin used in shoe materials, the vinyl acetate content is generally 15% to 22%. Because EVA resin blended foam products have soft, elastic, chemical corrosion resistance and other properties, it is widely used in the middle and high grade travel shoes, hiking shoes, slippers, sandals soles and interior materials. In addition, this material is also used in the field of sound insulation boards, gymnastics MATS and seals.   2. Film. The main use of EVA film is the production of functional shed film. Functional shed film has high weather resistance, anti-fogging and insulation properties, because polyethylene does not have polarity, even if a certain amount of anti-fogging agent is added, its anti-fogging performance can only be maintained for about 2 months; The addition of a certain amount of EVA resin made of the shed film, not only has a higher light transmittivity, and anti-fogging performance is also greatly improved, generally more than 4 months. In addition, EVA can also be used to produce packaging film, medical film, laminated film, casting film and so on.   3. Wire and cable. With the continuous development of computer and network engineering, more and more people use halogen-free flame retardant cables and silane cross-linked cables for the safety of computer rooms. Because EVA resin has good packing tolerance and crosslinking, it is used more in halogen-free flame retardant cables, semiconductor shielded cables and two-step silane crosslinked cables. In addition, EVA resin is also used to make some special cable sheathing. EVA resin used in wire and cable, vinyl acetate content is generally 12% to 24%.   4. EVA resin also has more applications in toys, such as children's wheels, seat cushions, etc.   5. Hot melt glue. Hot melt adhesive with EVA resin as the main component, because it does not contain solvents, does not pollute the environment and has high safety, it is very suitable for automated production line, so it is widely used in wireless book binding, furniture edge sealing, automobile and household appliances assembly, shoe making, carpet coating and metal anti-corrosion coating.   6. EVA resin is also widely used in ink, luggage, bottle cushion cover and other fields, and it is estimated that EVA resin consumption in these aspects is not less than 15 kt.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.

When the content of vinyl acetate in EVA is less than 20%, it can be used as a plastic. EVA has good low temperature resistance, its thermal decomposition temperature is low, about 230℃, with the increase of molecular weight, the softening point of EVA rises, the machinability and the surface gloss of plastic parts decline, but the strength increases, the impact toughness and environmental stress cracking resistance improve, EVA chemical resistance, oil resistance compared with PE (polyethylene), PVC (polyvinyl chloride) is slightly worse, and the change is more obvious with the increase of vinyl acetate content. EVA compared to PE performance improvement, mainly elasticity, flexibility, gloss, permeability and other aspects, in addition, its resistance to environmental stress cracking has been improved, the receptivity of the filler increases, can be used to add more reinforcement filler method to avoid or reduce EVA mechanical properties than PE decline. EVA can also be modified to get new applications, and its modification can be mainly considered from two aspects: first, EVA is used as the backbone of other monomer grafting; The second is the partial alcoholysis of EVA.   The forming method of ethylene-vinyl acetate copolymer can use the forming method and equipment of general thermoplastics, and the processing temperature is 20 ~ 30℃ lower than LDPE.Because of its elasticity, it can be made into rubber-like film products without having to go through vulcanization and other processes. The ethylene-vinyl acetate copolymer is easy to color, and the products are colorful. The lower limit of the molding temperature is to maintain a certain fluidity, and the upper limit is to prevent the thermal decomposition of the ethylene-vinyl acetate copolymer. The material temperature is generally controlled at 170 ~ 200℃.The vacuum formed products of ethylene-vinyl acetate copolymer are smooth and transparent. The molding equipment used is similar to LPPE. Similar to the equipment used in PE and PVC, it can be calendered, extruded, and multi-layer co-extruded composite.When extrusion blow molding, the cooling of the material must be given special consideration, and the traction should also be lighter, otherwise the opening is poor, and the slippery agent should be added if necessary.The expansion rate can be controlled effectively by adjusting the amount of foaming agent. The scraps can be recycled and no vulcanization is required. Ethylene-vinyl acetate copolymer foam has the characteristics of good elasticity, light weight, toughness and low shrinkage.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com ElephChem Holding Limited, professional market expert in Polyvinyl Alcohol(PVA) and Vinyl Acetate–ethylene Copolymer Emulsion(VAE) with strong recognition and excellent plant facilities of international standards.