Green synthetic resin new products can meet the needs of high quality of life, such as safe and non-toxic toys and daily necessities, high barrier food packaging materials. In order to meet the requirements of comfortable travel, high performance synthetic resin was used to prepare low volatile organic compound (VOC) automotive interior materials, new high-speed train structural and decorative parts with fire retardant, vibration reduction, noise reduction and other effects.

Polyolefin high-end grades (such as metallocene polyethylene, metallocene polypropylene, high carbon olefin copolymer polyethylene, etc.) and special polyolefin (such as ethylene - vinyl acetate copolymer (EVA) resin, ethylene - vinyl alcohol copolymer (EVOH) resin, polybutene-1, etc.), in China's consumption of 1.138× 107 t/ A, Self-sufficiency is below 40%. High-end synthetic resins such as polyvinyl butyaldehyde (PVB) films for laminated glass, electronic grade epoxies and polyvinylidene fluoride (PVDF) membranes for power batteries are largely imported.

What is the development trend of high performance polyolefin material technology?

1.Develop raw material diversification technology

The key technology of producing high performance polyolefin with diversified raw materials is to optimize the feed control and ensure the quality of raw materials, and to flexibly use a variety of raw materials through process optimization.

2.Upgrade catalyst technology

The research on polyolefin catalysts has shifted to improving the comprehensive properties of products with the main goal of improving the control ability of catalysts on polymer properties.

The metallocene catalyst achieved fine adjustment of the length, branching degree and structural regularity of the polymerization chain. Compared with the traditional Zeigler/Natta catalyst, the polyolefin products prepared by metallocene catalyst have better structure, regulability and product performance.

3.A variety of polymerization processes coexist

The number of polypropylene polymerization processes is more than 20, especially Unipol, Novolen, Innovene, represented by the gas phase process has developed rapidly in the past 10 years; Multizone circulating reactor technology is also emerging. The polyolefin elastomer (POE) polymerization process is mainly Insite solution polymerization process developed by Dow Chemical Company and Exxpol high pressure polymerization technology developed by ExxonMobil Company. In recent years, a novel chain shuttle polymerization technology based on Insite catalyst technology has been successfully developed, and high performance olefin block copolymers have been obtained.

4.Devices tend to be larger

The scale of single set of polypropylene project under construction in China is concentrated in 300,000-450,000 tons/year. The research and development of large polyolefin production equipment has made remarkable progress. The domestic large extrusion granulation unit can achieve 300,000-350,000 tons/year.

5.The emergence of high-end brand products

The polyolefin product technology aims to improve the comprehensive ability of products, and is committed to developing new varieties, increasing the added value of products and expanding the application field of products.

In terms of polyethylene, heat-resistant polyethylene (PE-RT) developed by improving comonomer has been used in building heating, and large diameter polyethylene pipe with better low melt sag and cracking resistance has been developed for oil field and logistics transportation by optimizing polyethylene bipeak polymerization process. A new product of Maugin polyethylene and a product of ultra high molecular weight polyethylene (UHMWPE) which can be used as a separator for lithium battery have been developed.

6.Attach importance to the recycling of waste plastics

In the natural environment, plastic products are difficult to decompose naturally after application, and the recycling of plastic products has become the focus of the world.

Waste plastic recycling technology mainly includes direct regeneration, modified regeneration, chemical recovery and so on. Chemical recovery method through pyrolysis, catalytic pyrolysis and pyrolysis - catalytic modification and other ways to change the bonding state of plastic macromolecules, make it decompose to produce a variety of low molecular compounds or oligomers; It can be used to produce fuel oil, fuel gas and chemical raw materials, and has become the most promising recycling method.