Innovation of the hottest bimodal polyethylene pro

2022-08-03
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Bimodal polyethylene production technology needs innovation urgently

bimodal polyethylene resin is widely used in many fields as a high-end product due to its special excellent performance. However, the production technologies of bimodal polyethylene resin in China are all imported technologies, which are greatly restricted in increasing production and capacity and increasing varieties and brands. Therefore, it is urgent to digest, absorb, innovate and improve

there are four bimodal polyethylene resin production enterprises in China, namely, Shanghai Petrochemical Company, Yanhua company, Yangzi Petrochemical Company and Daqing Petrochemical Company, with a total annual capacity of 690000 tons. Compared with the annual demand of more than 1.3 million tons in the domestic market, the production capacity is seriously insufficient

the relative molecular weight distribution of bimodal polyethylene presents two peaks, which is composed of the high relative molecular weight part followed by the electronic information and electrical industry and the low relative molecular weight part. This feature makes the high relative molecular weight part can ensure the physical and mechanical strength of the polymer, while the low relative molecular weight part can improve the processing performance. At the same time, it solves the contradiction between processability and mechanical properties of polyethylene resin, and makes the rigidity and toughness of the material reach a good balance. Compared with ordinary polyethylene resin products, it has higher strength, stress cracking resistance and molding processing performance, and has a longer service life under the same service conditions

it seems that the excellent processing performance of bimodal polyethylene resin has been successfully expected, which makes it have excellent performance in reducing product wall thickness, improving product production rate and improving product physical properties. Therefore, at present, the demand in the production of pipes, films, flexible packaging materials and blow molded hollow containers has increased rapidly. At present, there are more middle and low-grade polyethylene, which has become the main direction of the development of high-grade polyethylene

among bimodal polyethylene resins produced in China, there are still few varieties and brands, especially the lack of high-grade products. Yangzi Petrochemical, Yanhua Petrochemical and Daqing Petrochemical only produce HDPE resin, and the bimodal polyethylene resin of these three companies is mainly middle-grade products. Daqing Petrochemical mainly produces three bimodal HDPE resin brands: 6366 bimodal pipe special material, 7000F bimodal high-strength film resin and 5305e bimodal cable special material; Yangzi Petrochemical bimodal HDPE resin is yz-600; Yanhua's bimodal HDPE resin grades are 7000F and 6380, of which 6380 meets the material requirements of PE80 pipe

at present, only Shanghai Petrochemical Company in China adopts the "North Star bimodal" process technology of Nordic chemical industry to produce all bimodal polyethylene resins from LLDPE to HDPE, including six categories of high-performance plastic special materials: polyethylene pipe material (pel00), film, blow molding, cable sheath, extrusion coating and injection molding. "Beixing Shuangfeng" is an advanced technology among bimodal polyethylene resin technologies, with large capacity and stable production. It is an advanced technology suitable for domestic introduction. Ygh041t special material for pipeline produced by Shanghai Petrochemical with this technology according to pel00 standard is the only polyethylene special material capable of manufacturing high-pressure gas pipeline in China at present, filling the gap of domestic bimodal polyethylene high-grade resin. The bimodal cable compound produced by Shanghai Petrochemical has the characteristics of low shrinkage, excellent resistance to environmental stress cracking and high extrusion speed. It can completely replace imported products. It plays an important role in the field of cable material and has been used in practice. Yangzi Petrochemical also launched bimodal hdpe5310m communication cable insulating material this year, which has good mechanical and electrical properties, adding a new brand to China's high-grade bimodal polyethylene resin

all the production technologies of bimodal polyethylene resin in China are imported technologies, but some innovations have been made on the basis of digestion and absorption. Bimodal polyethylene catalyst, developed by Sinopec and Shanghai Research Institute of chemical industry, has been industrialized in Shanghai Petrochemical, mainly used to produce HDPE film. The application results show that the catalyst runs stably in the imported unit, its activity is slightly higher than that of the imported catalyst, the particle shape of the product is good, and other physical properties such as impact strength, biaxial tensile strength, elongation at break, etc. all reach the index of superior products

with the rapid development of China's ethylene industry, polyethylene production capacity has gradually increased, but there is still less high-grade resin, which has been in short supply. In recent years, the market demand for HDPE films, pipes, hollow containers, cable materials and sheets has been rising and has occupied a large share, accounting for more than 65% of the total demand for HDPE. In particular, plastic pipes occupy an increasing share in the building materials market, but there are still some problems in the quality of the developed special materials. Therefore, it is urgent to adjust the product structure. The planning, construction and expansion of large-scale bimodal polyethylene resin plant or the selection of advanced technology to transform the existing plant has become an effective way to increase the production of bimodal polyethylene resin in China, which is of great significance to improve the grade of bimodal polyethylene resin in China

information source: China Chemical Information

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