Production line of air permeable film
DATE：2021/5/18 9:16:55 / READ： / SOURCE：This station
Production line of air permeable film
High performance, refinement and functionalization of polypropylenePP is the second largest plastic variety with the output and dosage second to PE. In 2004, the global PP production capacity has exceeded 40 million tons. Since the industrialization of PP in 1957, PP has become the shortest, fastest growing and developing plastic variety in general thermoplastic. Its application field is also increasingly widespread, and it has become an indispensable material in the development of national economy. Because PP has excellent comprehensive performance and relatively low price, and it is easy to modify, PP modified new materials emerge endlessly, and the amount of PP modified materials in automobile, household appliances, tool equipment, electronics, construction, computer and other industries is increasing, which has aroused enthusiasm for research and development, and played a great role in promoting the development of PP modification technology and formula technology.
The large PP production units in China are mainly imported. Due to the constraints of many aspects, many brands are still difficult to produce. At the same time, the scale of the plant is small, and the scale benefit is still far from that of foreign large companies. But these are difficult to prevent the development of PP industry in China. In 2006, China's PP output has reached 3.5 million tons, and the demand exceeded 5million tons, becoming the third largest consumer after the United States and Japan. At present, the current situation of PP industry in China is: there are many small-scale production units, more general materials, less special materials, incomplete brand and few new technology and new products. All of these restrict the development of PP industry in China.
PP has excellent physical and mechanical properties and good processability, which is the reason for its rapid development. But PP also has many shortcomings, such as poor aging resistance, toughness to be improved, strength is not high, transparency is not good, flammable, forming shrinkage rate is large. Hot parts: electric accessories: the 10000 method of clothing and clothing fusion is used to prepare the limited range shoes material, which can meet the requirements of flame retardant infant for materials such as household appliances and automobiles: 0 transparency; The new PP material with high transparency was prepared by adding technical agent, which can be used in transparent packaging and other fields@ Anti aging: lacquer and antioxidant are used to improve the aging resistance of PP.
Products.
From the above, PP has a wide range of modification methods and varieties of modification. It can be used to prepare special materials which meet different requirements of all walks of life. Therefore, PP modification is developing rapidly, becoming the largest variety of modified plastics and the most widely used new materials in stores.
Chemical modification of polypropylene
The elastomer, while above T. can melt and flow. The vertical block propylene. The active center of three-dimensional energy without net, so that the shape of a large molecule has regular and isoregular segments
Temperature and toughness. Compared with propylene ethylene random copolymers, the impact strength is large and the embrittlement temperature is low. Compared with isotactic PP, the reduction of energy is related to the ethylene segment content, the structure, relative molecular weight and the relative molecular weight distribution of the block. The ethylene segment content in the block copolymers is generally 5% - 20% (mass fraction), which has high rigidity and high binding degree of the low physical and chemical properties, It has the characteristics similar to isotactic PP and HDPE, and its properties are low and brittleness is improved. Compared with HDPE, it has high heat resistance, good stress opening resistance, high surface hardness, low shrinkage rate and good creep resistance.
Author：admin