Preparation process of TPU (thermoplastic polyurethanes) protective film base film

Abstract

The invention discloses a preparation process of a TPU (thermoplastic polyurethanes) protective film base film. The preparation process comprises the specific steps as follows: step one, TPU raw material particles are subjected to heating plasticization; step two, a plasticized TPU melt is subjected to film extrusion by a mold, rolling treatment is performed when a TPU film is not shaped, and a high-gloss PET (polyester) film is composited at the same time; step three, cooling shaping treatment is then performed, and winding is performed finally. The preparation process has the advantage that technical problems about cleanliness, crystal points, flow marks, water ripples and the like of TPU can be solved, the preparation process is better used for the protective film industry, the produced TPU protective film base film has better light transmittance and higher degree of cleanliness than those of a current base film, and the high-quality TPU base film is provided for domestic TPU protective film production enterprises, so that the TPU protective film industry has more advantages internationally. By modification of the material, the product can be used for protecting automotive paint finishes, the product has an automatic repair protection by characteristics of high elasticity, high permeability, invisibility and the like of the TPU, and appearance scratches and minor bumps of automobiles can be prevented.

Description

technical field [0001] The invention relates to the field of TPU films, in particular to a preparation process of a TPU protective film base film. Background technique [0002] TPU (Thermoplastic polyurethanes) is called thermoplastic polyurethane elastomer rubber. It is mainly divided into polyester type and polyether type. It has a wide range of hardness, wear resistance, oil resistance, transparency, and good elasticity. It is widely used in daily necessities, sporting goods, toys, decorative materials and other fields. Halogen-free flame-retardant TPU It can also replace soft PVC to meet environmental protection requirements in more and more fields. Due to its good transparency, high elasticity, excellent flexibility, and excellent environmental degradation performance, TPU materials have been widely used in the protective film industry by developed countries in the world. At present, TPU in Japan and South Korea is used in Asia The quality of the base film of the prot...

AI Technical Summary

Problems solved by technology

Due to its good transparency, high elasticity, excellent flexibility, and excellent environmental degradation performance, TPU materials have been widely used in the protective film industry by developed countries in the world. At present, TPU in Japan and South Korea is used in Asia The quality of the base film of the protective film is the best. At present, the base films of coating factories producing TPU protective films in China all rely on imports. Especially for some high-precision TPU base films, relevant countries also restrict exports to protect their domestic protective film manufacturers in China. Due to the relatively short period of technology accumulation due to the late start of TPU film production in China, it is quite different from South Korea and Japan. The surface of TPU base film is prone to problems such as crystal spots, flow marks, water ripples, and low cleanliness. Without the high-definition and high-cleanliness requirements of screen protection, the technical research and development of TPU base film used for TPU protective film is very difficult. It can be said that the core technology of the base film of TPU protective film has been mastered in countries such as Japan and South Korea for a long time. Every year, Chinese companies have to import from South Korea and Japan at a high price and a long time. The import of high-end TPU base films is still restricted. Related TPU protective film companies in Japan and South Korea use their domestically produced high-quality TPU base films for backing. The TPU protective film produced by processing technology such as coating and coating is exported to China at a relatively high price, while enterprises in China that are capable of coating TPU base film to produce protective film are faced with the situation of purchasing TPU base film at high prices from abroad, the time cost and material cost of procurement If it is too high, it can only operate with low profit, and the competitive advantage is not obvious, which reduces the economic benefits of the manufacturer