1. The Difference between TPU and PU Material
TPU is short for "Thermoplastic_Urethane" and its Chinese name is thermoplastic polyurethane elastomer.TPU is composed of diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI), macromolecule polyols and chain extenders.Polymer materials synthesized by co-reaction of agents. Its molecular structure is composed of dipheny lmethane diisocyanate (MDI),The rigid block formed by the reaction of toluene diisocyanate (TDI) with chain extender and the flexible segment formed by the reaction of diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI) and macromolecule polyols alternately. TPU hasExcellent high tension, high tension, toughness and aging resistance. TPU is a mature environmental protection material. TPU is an environmental protection polymer. Its Chinese name is thermoplastic polyurethane, also known as waterproof and moisture permeable film. It not only has most of the characteristics of rubber and plastics, but also has excellent comprehensive physical and chemical properties, so it is also known as the future material.TPU film is made of TPU granules by special process. It inherits the excellent physical properties of TPU and has a wide range of applications. TPU has been widely used in health care, electronics, industry and sports. In the 20th century, in Europe and the United States and other countries, TPU waterproof breathable clothing, special film for shoes, special film for silica gel breast pad and TPU elastic belt have been mature. It has the characteristics of high strength, good toughness, abrasion resistance, cold resistance, oil resistance, water resistance, aging resistance and climate resistance that other plastic materials can not match. At the same time, it has many excellent functions such as high waterproof and moisture permeability, wind resistance, cold resistance, antimicrobial, mildew resistance, warmth retention, ultraviolet resistance and energy release.
TPU thin film is a kind of thin film based on TPU granular material, which is prepared by special processes such as casting, calendering, casting and blowing after heating and melting.
PU is the abbreviation of Polyurethane, which is called polyurethane in Chinese. PU is polyurethane, PU
Membrane is polyurethane film, which is a non-toxic and harmless environmental protection material. It has no harm to human skin, and is widely used in clothing fabrics, medical and health, leather and other fields. It has good elasticity and high lightness. Although the waterproofing property is very thin (0.012-0.055mm), there is a breakthrough in the function that other materials can not match (can withstand water pressure above 1000mm water column). This breakthrough can greatly enhance the added value of textiles with the textile industry's fitting processing technology. Now it has been widely used in high-grade fabric composite, home textile composite, leather surface coating, PU leather and other applications. In addition to thisBesides, it has excellent cold resistance, environmental protection, non-toxicity, recyclability and decomposition.
When PU film is reacted with solvent, liquid slurry is used to coat it on the needed stripping paper. The solvent is heated and dried, and the film is formed after chemical reaction.
Generally speaking, PU membranes may be very thin, and it is difficult to achieve a thickness of more than 0.05 mm. TPU membranes are usually blown or cast, with a thickness of 0.07-2.5 mm. In addition, traces of melting flow of TPU materials during heating and melting can be seen. Surface feel and surface pattern PU film are flexible and changeable.
2. TPU Waterproof Zipper and PU Waterproof Zipper
TPU waterproof zipper is made of TPU film and reactive thermosetting glue by laminating machine, and PU waterproof zipper is made of PU film and reactive thermosetting glue by laminating machine. The difference between the two is the performance of the film material on the surface.
At present, waterproof zippers in the zipper market are mainly divided into three types: ordinary TPU waterproof zippers, which are bonded with TPU film and zipper by reactive thermal curing PU glue; PU film (with high temperature hot melt glue) which is bonded with zipper. The representative product is KMK product of Jinhu in Shandong Province (called Korean version in China), and many domestic manufacturers add a heat coating on this basis. Solid reactive PU glue, the quality of stability than KMK has greatly improved, domestic higher-end manufacturers are using this method; First, all use thermosetting PU glue and zipper bonding, on behalf of the product Yoshida Zipper Black Branch of Japan YKK products (domestic name is Y version).
The use and application of waterproof zippers mainly aim at the application scope of ready-made clothes or textiles to make reasonable choices. For low-end or very short-lived products, more PVC films are used. It is not easy to use low-end products of PVC type for products with high use requirements or easy to be heated in the process of textile forming, in order to avoid causing various economic losses. The difference between TPU and PU lies in the comprehensive factors such as the economic value and brand of textile itself.