Abstract: although the thermoplastic polyurethane (TPU) film accounts for a very small proportion in the plastic film industry, its advantages in environmental protection are prominent due to its good biocompatibility and recyclability. With the continuous improvement of people's environmental awareness and consumption ability, the substitution effect of TPU film on existing plastic film products will gradually be reflected.
I. environmental protection advantages highlight the annual increase of market size by 13.3%
TPU film with high strength, good toughness, cold resistant, oil resistant, aging resistant, resistant to climate, environmental non-toxic, biodegradable, waterproof and moisture permeable, wind, cold, warm, antibacterial, anti-ultraviolet radiation and energy release, excellent performance, can be applied to material, waterproof and moisture permeable fabrics, food packaging, medical supplies, airbag filling body, sports leisure equipment, and many other fields.
It is easy to recycle and use and has biodegradability, which can avoid environmental pollution by waste fundamentally. It is biocompatible, non - toxic, non - allergic, non - irritant and non - pyogenic. Because of its superior performance and environmental protection concept is increasingly welcomed by people, its application breadth and depth are expanding. With the alternating development of industrial technology, TPU film has become the trend of environmental protection policy.
Use TPU new product in the production of hot melt adhesive, hot melt adhesive film, also gradually began to start, development, and the current dominate EVA hot melt adhesive and synthetic rubber class compared to hot melt adhesive, TPU hot melt adhesive film can meet the customer demand for high viscosity, at the same time also has the TPU good physical properties, good elasticity, high mechanical strength, for example, many traditional hot melt adhesive difficult areas to use TPU hot melt adhesive film can be competent. TPU hot melt film will be one of the important development directions in the field of plastic film and hot melt adhesive in the future.
According to the statistics of China plastics association, the TPU film market maintained an average annual growth rate of 13.3% from 2013 to 2017, reaching 3.03 billion yuan in 2017, and the consumption scale of TPU hot melt film reached 1.47 billion yuan.
At present, international TPU film enterprises are mainly in Europe, the United States, South Korea, Japan and Taiwan. In early days, China's TPU films were mainly imported. In recent years, with the rapid development of domestic enterprises, domestic products begin to dominate the Chinese market, but some high-end market areas are still dominated by imported products.
二、The application extends to new fields and the penetration rate is increasing
1.Shoes material
TPU thin film vamp material is usually composed of three layers: the surface layer is PU layer, which is used for coloring and printing patterns on the vamp; The middle layer is TPU film, the main part of the fabric, which determines the main performance characteristics of the vamp. The underlying layer is TPU hot melt film, which is mainly used as adhesive to realize the bonding between TPU vamp material and shoe body. TPU thin film vamp material can use the excellent bonding performance of its underlying TPU thermoplastic film to directly fit and press to shape the shoe body without the need of sewing technology, so it is also known as TPU seamless vamp.
Since 2009, due to the excellent performance of TPU thin film vamp and the processing method without manual cutting, TPU thin film vamp has gradually been widely used to replace PU micro-fiber leather and PU space leather. At present, domestic and foreign first-line sneaker brands have adopted TPU thin film for making vamp, and domestic second-line sneaker brands have started to use TPU thin film vamp.
2.Waterproof and moisture-permeable fabric
TPU film has strong adhesion and can be bonded with various materials to become high-performance composite materials. TPU blow molding waterproof and moisture permeable film is widely used in clothing products, aeration products, sports products, medical supplies and other fields. The waterproof and moisture permeable composite fabric is made of common textile fabrics and TPU film, which is a high-tech product integrating waterproof, moisture permeable, wind proofing and heat preservation. It is called "breathable fabric" or "human second skin". Fundamentally solved the contradiction between the waterproof and moisture permeable, increased the people wearing comfort, improve the product grade and added value, occupy the high-end market, has become the main project of national textile product development, and industrialization areas continuously extend, the western developed countries have put it as a high-tech products of the 21st century. At present, TPU waterproof and moisture permeable thin film has been widely used in clothing and other fields in China.
3.High-end handbags and leather goods
At present, genuine leather, synthetic leather and cloth are the three most commonly used materials for high-grade handbags and leather goods. TPU film has excellent properties such as waterproof, moisture permeable, yellow resistance, hydrolysis resistance, high temperature resistance, etc. Its application in high-grade handbags and leather products is mainly laminated with the above three materials, manufacturing body, decoration, accessories, etc., so that it has better hand feeling and physical properties. High-end handbags and leather goods
Due to the price, TPU film has only been used as luggage and bag material in recent years, and only medium and high-end luxury handbags and leather goods are used, but the usage amount shows a rapid growth trend. With the increasingly strict supervision and restriction on the synthetic materials like PU and PVC in Europe, America and Japan, the synthetic materials like PVC and PU will gradually be replaced by the environment-friendly TPU. It is expected that the market size of TPU thin film in high-end handbags and leather goods will continue to grow rapidly in the next few years.
4.The airbag filling body
TPU is a new kind of gasbag material, which has developed rapidly in recent years. Compared with PVC and traditional rubber blanket, it has obvious advantages. TPU has incomparable properties of rubber or PVC, such as tensile resistance, tear resistance, abrasion resistance and low temperature resistance, as well as good oil resistance, aging resistance and weather resistance. It is superior to PVC in terms of material softness and mechanical strength, and does not contain a lot of plasticizer easy to volatilize, which leads to brittle hardening of materials and deterioration of mechanical properties.
However, due to the high price, TPU adhesive tape is mainly used to produce high-end materials with high requirements on material properties, such as inflatable mattresses, massage chair materials, rubber ships and inflatable boat materials for offshore operations, hoisting airbags materials, military or civil airships' materials, ball covering and inner bladder, etc.
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