Analysis on the development trend of China's modified plastics industry

1. The application field of modified plastics is gradually broadened

With the continuous improvement of the level of science and technology, the modification technology has been further developed. The flame retardant, weathering and alloying levels of modified plastics are continuously improved, and the application fields are gradually expanding. For example, rigid PVC substitute wood materials can be widely used in packaging and construction. , furniture and other fields.

2. General plastics engineering

General-purpose plastics can be modified to improve performance, have engineering features, and can capture the market share of some traditional engineering plastics. Although the new varieties of engineering plastics continue to increase and the application fields continue to expand, the current market price of engineering plastics is 3-4 times that of ordinary plastics, and the output is also lower than that of general-purpose plastics. With the development of modified equipment and advances in modification technology, general-purpose plastics such as PP and ABS can be modified to improve strength and heat resistance, so that they have the characteristics of certain engineering plastics, but the price is significantly lower than engineering. Plastics are therefore able to capture some of the traditional engineering plastics market share.

3. High performance of engineering plastics

With the booming domestic automotive, electrical, electronics, communications and machinery industries, engineering plastics such as polycarbonate (PC), polyamide (PA), polyester (PBT, PET), polyphenylene ether (PPO), etc. Higher performance requirements, for example, plastics used as energy-saving lamp bases are required to withstand high temperatures and yellowing; plastics used as chip trays are required to be resistant to flexing and antistatic; plastics used as electronic connectors are required to be highly flame-retardant, High heat resistance and high flow; plastics used as mechanical gears require wear resistance, high rigidity, high dimensional stability, etc. Engineering plastics can be modified to improve various mechanical and physical properties to meet the high performance of engineering plastics in downstream industries. Claim.

4. Cost reduction of special engineering plastics

Plastics that can be used for a long time at temperatures above 1500 ° are called special engineering plastics, such as polyphenylene sulfide (PPS), polyimide (PIM), polyetheretherketone (PEEK), polysulfone (PSU), etc. It has the characteristics of good electrical performance, high temperature resistance and dimensional stability (some special engineering plastics also have good flame retardancy, radioactivity, chemical resistance and mechanical properties), and are more and more widely used in electronic appliances, automobiles, In the advanced technology fields such as home appliances, aviation, paints, petrochemicals, rockets, and aerospace, the market price is generally several times that of ordinary engineering plastics. After modifying special engineering plastics, it can maintain its original high performance and reduce it. The price can be widely used in civilian products.

5. Application of nanotechnology in the modified plastics industry

Plastics modified with nanotechnology have many unique properties, such as 5% organic montmorillonite modified nylon (PA6), which can increase the heat distortion temperature by 1.5 times; polyester (PET) will greatly increase the addition of nanoclay The gas permeability of the material is reduced by 100 times less than that of pure PET. The nano-plastic inorganic nanoparticles are added in a small amount (generally 2%-5%), which is only about 10% of the amount of the usual inorganic filler modification, and the composite density and the original resin density are the same or similar, so it will not Due to the excessive increase in density, the production cost of downstream plastic processing plants is increased, and there is no disadvantage that other properties are degraded due to excessive fillers. Since the size of the nanoparticles is small, the plastic modified by the nanotechnology hardly undergoes breakage and breakage during molding and recovery, and has good recyclability.

6. The environmental protection requirements for modified plastic products are becoming stricter

With the increasing awareness of environmental protection around the world, consumers are increasingly demanding flame retardant requirements for plastic products. Halogen-free, low-smoke, low-toxic environmentally-friendly flame retardants have been increasingly required to be used. Nearly 80% of the flame retardants for modification are halogen-containing flame retardants, and the main components of halogen-containing flame retardants are polybrominated diphenyl ethers and polybrominated biphenyls. 70%-80% of the electrical and electronic products for export in China use such flame retardants. The bromine-ruthenium flame retardant system generates a large amount of smoke and corrosive gases during thermal cracking and combustion.