Modified plastics are intermediate products in the petrochemical industry chain. They are mainly processed from five general-purpose plastics and five engineering plastics as plastic matrices. They have the characteristics of flame retardancy, impact resistance, high toughness, and easy processing. Modified plastics are a typical industry that benefits from technological progress and consumption upgrades. Thanks to the accelerated transfer of global home appliances, computers, power tools, and toys production capacity to China, my country has become a major manufacturing country in these fields with its cost advantages in labor and other production factors, and has promoted the development of the domestic modified plastics industry. Consumption upgrades have brought China's automobile, construction and other industries into a period of rapid growth. As people's requirements for material performance continue to increase, my country is becoming the world's largest potential market for modified plastics and the main driving force for demand growth. my country's modified plastics industry has developed rapidly, with an average annual growth rate of 20% and 15% in output and apparent consumption respectively. The total annual demand for modified plastics in China is about 5 million tons, accounting for about 10% of the total plastic consumption, but still far below the world average of 20%. In addition, there is still a big gap between my country's per capita plastic consumption and that of developed countries in the world. As an indicator to measure the development level of a country's plastic industry, the ratio of plastic to steel in my country is only 30:70, which is lower than the world average of 50:50, and even lower than the 70:30 in developed countries such as the United States and 63:37 in Germany. With the substantial improvement of people's living standards and the advancement of technical means, "replacing steel with plastic" and "replacing wood with plastic" will become a trend in China. As a sub-category of the plastic processing industry with rapid development and great development potential, the modified plastics industry is expected to maintain a growth rate of more than 10% in the next five years. The overall development level of my country's modified plastics industry is low, the production scale of enterprises in the industry is generally small, and the market situation of products also shows the characteristics of more primary products, unstable quality of intermediate products, and lack of advanced products, which is far from meeting the needs of my country's economic development in the 21st century. Therefore, as an important part of the field of new chemical materials, modified plastics have also been listed as one of the key scientific and technological fields for development by the state. Since 2007, my country has successively issued various policies to promote the development of the modified plastics industry. Modified plastics have been listed as one of the key scientific and technological fields for development by the state. Since 2007, my country has successively introduced various policies to promote the development of the modified plastics industry. The automobile and home appliance industries are hot spots for the development of modified plastics, accounting for more than 50%. The application of plastics in the automotive industry began in the 1950s and has a history of more than 50 years. As automobiles develop towards lightweight and energy-saving, higher requirements are placed on materials. Since 1kg of plastic can replace 2-3kg of heavier materials such as steel, and every 10% decrease in the weight of the car can reduce fuel consumption by 6%-8%. Therefore, increasing the amount of modified plastics in automobiles can reduce the cost and weight of the entire vehicle and achieve energy-saving effects. The market for modified plastics for home appliances in my country is mainly occupied by foreign companies, and domestic modified plastic companies only account for less than 1/3 of the market share. Since the products of domestic companies are mostly limited to low-tech and low-standard levels, the ability to explore areas with high-performance requirements is obviously insufficient. The downstream of modified plastics is mainly the automobile and home appliance industries, both of which account for more than 50%. Since 2008, the introduction of home appliances to the countryside, old-for-new and automobile preferential policies have greatly promoted the development of the industry. In addition, the policy orientation of energy conservation and emission reduction has also promoted automobile companies to reduce the weight of automobiles and thus achieve energy conservation and emission reduction, which has greatly promoted the development of the modified plastic industry. With the substantial improvement of people's living standards and the advancement of technical means, it will become a trend to replace steel and wood with plastic in China. Modified plastics are a field of plastic industry that involves a wide range of areas, has high technological content and can create huge economic benefits. And plastic modification technology - filling, blending and reinforcement modification is deeply involved in the raw materials and molding process of almost all plastic products. From the production of raw resin to modified plastic masterbatch of various specifications and varieties, in order to reduce the cost of plastic products and improve their functionality, plastic modification technology is indispensable. Ordinary plastics often have their own characteristics and defects. Modified plastics are to change the properties of plastics. The basic technologies include: 1. Reinforcement: Blending glass fiber with plastics to increase the mechanical strength of plastics. 2. Filling: Blending fillers such as minerals with plastics to change the shrinkage rate, hardness, strength and other properties of plastics. 3. Toughening: By adding toughening agents to ordinary plastics to improve the toughness of plastics, the toughened and modified products are: rail gaskets. 4. Flame retardant: Adding flame retardants to ordinary plastic resins can make the plastics have flame retardant properties. The flame retardant can be a composite system of one or several flame retardants, such as bromine + antimony system, phosphorus system, nitrogen system, silicon system, and other inorganic flame retardant systems. 5. Cold resistance: Increase the strength and toughness of plastics at low temperatures. Generally, the inherent low-temperature brittleness of plastics at low temperatures limits their application in low-temperature environments. It is necessary to add some low-temperature resistant toughening agents to change the brittleness of plastics at low temperatures. For example, plastic parts such as car bumpers are generally required to be cold-resistant.
