An article to understand the difference between EVA film and TPU film

1. Chemical structure

1. EVA film: EVA is a copolymer of ethylene and vinyl acetate, in which the ratio of ethylene and vinyl acetate can be adjusted as needed. This copolymer combines the rigidity of ethylene and the flexibility of vinyl acetate, giving the EVA film excellent weather resistance and flexibility.

2. TPU film: TPU is a thermoplastic polyurethane made by the joint reaction of isocyanate, polyol and small molecule chain extender. The TPU molecular chain contains strong polar urethane groups, which makes the TPU film have excellent oil resistance, wear resistance and tear resistance.

2. Physical properties

1. EVA film: EVA film has good light transmittance, weather resistance and aging resistance. Its flexibility makes it widely used in packaging, adhesives and coatings. EVA film also has good impact resistance and sound insulation.

2. TPU film: TPU film has high tensile strength, tear strength and wear resistance. Its oil resistance gives it unique advantages in oil transportation, sealing and wear-resistant coatings. TPU film also has good UV resistance and low temperature resistance.

III. Application fields

1.EVA film: Due to its good light transmittance, weather resistance and flexibility, EVA is widely used in solar panels, architectural glass films, automobile windshields, packaging materials and other fields. EVA film can also be used to make soles, cable insulation layers, hot melt adhesives, etc.

2.TPU film: TPU film is widely used in shoemaking, clothing, medical, automotive, construction and wire and cable fields due to its excellent oil resistance, wear resistance and tear resistance. In the field of shoemaking, TPU film can be used to make waterproof uppers, soles and insoles. In the medical field, TPU film can be used to make medical devices such as surgical gowns, gloves and catheters. In the automotive field, TPU film can be used to make sealing strips, fenders and interior materials. In the construction field, TPU film can be used to make waterproof rolls, sealing materials and sound insulation materials.

IV. Processing performance

1.EVA film: EVA film has good thermoplasticity and processing performance, and can be processed into products of various shapes and sizes by hot pressing, extrusion, injection molding and other molding methods. EVA film can also be co-extruded, blended and composited with a variety of materials to meet different application requirements.

2. TPU film: TPU film also has good thermoplasticity and processing properties, and can be processed into products of various shapes and sizes by extrusion, injection molding, calendering and other molding methods. Because the TPU molecular chain contains polar groups, the TPU film has good adhesion and compatibility during processing and can be composited with a variety of materials.

EVA film and TPU film have significant differences in chemical structure, physical properties, application fields and processing performance. In practical applications, appropriate materials should be selected according to specific needs. With the continuous advancement of science and technology and the continuous improvement of people's requirements for material performance, the application fields of EVA film and TPU film will continue to expand, bringing more convenience and surprises to people's production and life.