English name of polyphenylene sulfide: polyphenylene sulfide, abbreviated to PPS

English Name: polyphenylene sulfide (PPS) is a new high performance thermoplastic resin, PPS is a crystalline polymer The untwisted fiber has a large amorphous area (crystallinity is about 5%), and exothermic crystallization occurs at 125 ℃, glass transition temperature is 93 ℃, melting point is 281 ℃ In the process of drawing, the crystallinity of the fiber increases to 60-80% by heat treatment at 130-230 ℃ Therefore, there is no obvious glass transition or crystallization exothermic phenomenon in the stretched fiber, and its melting point is 284 ℃ With the increase of crystallinity after heat setting, the density of the fiber increases accordingly, from 1.33g/cm3 before stretching to 1.34g/cm3 after stretching, and after heat treatment, it can reach 1.38g/cm3 PPS is a kind of special engineering plastics with excellent comprehensive properties PPS is widely used as structural polymer materials because of its excellent high temperature resistance, corrosion resistance, radiation resistance, flame retardancy, balanced physical and mechanical properties, excellent dimensional stability and excellent electrical properties After being filled and modified, PPS is widely used as special engineering plastics At the same time, it can also be made into various functional films, coatings and composite materials, which have been successfully applied in the fields of electronics, aerospace, automobile transportation, etc In recent years, domestic enterprises have actively researched and developed, and initially formed a certain production capacity, which has changed the previous situation of completely relying on imports However, China's PPS technology still has some problems, such as fewer product varieties, fewer high-function products, and the capacity needs to be expanded urgently, which will be the focus of PPS's next development Features: it has the advantages of high mechanical strength, high temperature resistance, high flame retardant, strong chemical resistance, etc.; it has the advantages of hard and brittle, high crystallinity, flame-retardant, good thermal stability, high mechanical strength, excellent electrical performance, etc PPS is one of the engineering plastics with the best heat resistance Its heat deformation temperature is generally higher than 260 ℃, chemical resistance is second only to polytetrafluoroethylene, and fluidity is second only to nylon In addition, it also has the advantages of small molding shrinkage (about 0.08%), low water absorption (about 0.02%), good fire resistance and vibration fatigue resistance Specific gravity: 1.36g/cm3 molding shrinkage: 0.7% molding temperature: 300-330 ℃ PPS material performance 1 Excellent electrical insulation (especially high-frequency insulation) white hard and brittle, falling on the ground with metal sound transmittance second only to organic glass colorability and good water resistance chemical stability It has excellent flame retardant and is non combustible plastic 2 It has general strength and good rigidity, but it is brittle and easy to produce stress embrittlement It is not resistant to benzene, gasoline and other organic solvents The long-term use temperature can reach 260 ℃, and it is stable in 400 ℃ air or nitrogen By adding glass fiber or other reinforced materials, the impact strength can be greatly improved, the heat resistance and other mechanical properties can also be improved, the density can be increased to 1.6-1.9, and the molding shrinkage is smaller to 0.15-0.25%, which is suitable for making heat-resistant parts, insulating parts, chemical instruments, optical instruments and other parts, and the molding performance of PPS plastics 1 The amorphous material has low moisture absorption but should be dried before forming 2 The fluidity is between ABS and PC, the solidification is fast, the shrinkage is small, and it is easy to decompose The injection pressure and injection speed are high Mold temperature is 100-150 ℃ The taper of main runner should be large and the runner should be short The disadvantages of PPS plastics are large brittleness, poor toughness and low impact strength After improvement, it can obtain very excellent comprehensive properties The products on the market are all improved products PPS plastics are widely used in: Electronic aspects: high voltage components, shell, socket, terminal post, starting coil and blade of motor, brush bracket and rotor insulation parts, contact switch, relay, electric iron, blower, lamp head, heater, class F film, etc Automobile industry: applicable to exhaust gas recirculation valve and water pump impeller, carburetor, exhaust device, exhaust control valve, light reflector, bearing, sensor parts, etc Machinery industry: used as bearings, pumps, valves, pistons, precision gears, photocopiers, cameras, computer components, pipes, sprayers, fuel injectors, instrument parts and so on Chemical industry: used to make acid and alkali resistant valve pipes, pipe fittings, valves, gaskets, submersible pumps or impellers and other corrosion-resistant parts At present, the production capacity of PPS resin in the world has exceeded 50000 tons / year, becoming the first major variety of special engineering plastics and the sixth largest engineering plastics after the five engineering plastics such as polycarbonate, polyester, polyformaldehyde, nylon and polyphenylene ether Its production pattern is: only the United States, Japan and China master the industrial production and manufacturing technology of PPS resin, with production capacity and products Russia and India are actively engaged in the research and development of PPS resin industrial production Chevron Phillips, Wu Yu Chemical Industry Company (including FORTRON) and Japan ink chemical industry company are the three major PPS resin producers in the world Among the emerging PPS resin manufacturers and products, the development of the second generation of linear high molecular weight PPS resin (its composite modified material is produced and sold by Baoli company in Japan) launched by Wuyu chemical industry company and its FORTRON PPS is the most remarkable The resin has advanced production process, good product quality and excellent performance, especially it improves the fatal defects of poor impact resistance and brittleness of PPS In addition, FORTRON PPS can directly make fibers and films, and the resin is light in color, so it can be made into various bright colored products, so it becomes the development direction of PPS resin and is widely welcomed Its production capacity has also expanded rapidly, and together with Ryton PPS, it has become two major brands of PPS resin Around 1990, due to the impact of the international economic environment, the average operating rate of Japanese PPS manufacturers was only maintained at a low level of 35% By 1994, the operating rate had reached about 60% of the rated production capacity After entering the 21st century, due to the strong market demand, the operating rate has increased significantly Especially after 2004, although the price of PPS resin increased by 10% due to the continuous increase of crude oil price, the demand for resin was still in short supply, and various companies were operating at full power to produce resin At the same time, some companies are preparing to expand their production facilities, such as Chevron Phillips, Japan ink chemical industry corporation and export light Petrochemical Industry Corporation, which have proposed plans to build 10000 ton production facilities respectively There are many manufacturers and product specifications and models of PPS Composite Aggregate in the world, among which Ryton PPS series of Chevron Phillips (including Toray Phillips company), FORTRON PPS series of Japan Baoli company and DIC PPS series of Japan ink company are the main suppliers The development of PPS in China the research and production of PPS in China began in the early 1970s More than 20 enterprises have set up pilot plants or production facilities for PPS resin synthesis, but there are generally fatal weaknesses of low technology level and poor technology In recent years, there are many domestic companies engaged in the production and development of PPS Composite materials, such as Chenguang Chemical Research Institute, Beijing Chemical Research Institute, Guangzhou Chemical Research Institute, etc., in the fields of PPS glass fiber reinforced, carbon fiber and inorganic mineral filled PPS forming, processing and application, Beijing FRP Research Institute in Continuous Fiber Reinforced PPS Composite plate, Zhongshan University in PPS / carbon fiber composite plate Great achievements have been made in material research However, there are still problems of small output and single variety in domestic composite aggregate plants, most of which are general varieties glass fiber reinforced materials and inorganic filler modified varieties At present, only a few units such as Sichuan Huatuo company and Sichuan University have some products for sale The prospect and development target of PPS at present, the total market demand of PPS modified and composite aggregate in China is more than 8000 tons / year, and the growth rate is very fast, the annual demand growth rate is as high as 15% - 20% The consumption of PPS products is still dominated by 0% - 40% glass fiber reinforced materials, mainly used in electronic appliances and precision machinery The consumption in automobile, motorcycle, petroleum and chemical industry is also growing steadily With the rapid development of China's electronic and electrical industry and automobile industry, the market prospect of PPS is very broad It is estimated that the market demand of PPS aggregates in China will reach 10000 tons / year in 2005 Many manufacturers and investors at home and abroad intend to intervene in PPS resin production line or build a new industrial PPS resin production line China's market is forming a double competitive situation of PPS production at home and abroad, which will be conducive to the further promotion of PPS in China and the expansion of market and application fields, and to explore the international market It is expected that in the next five years, the demand of PPS will have an annual growth rate of more than 10% At present, the production and demand of PPS in the world has become tense With the development of society, the total demand of automobile and electronic industry for PPS will further expand This has provided opportunities for PPS resin manufacturers around the world to expand production, but also for China's PPS industry Combined with the development trend of PPS and new materials at home and abroad, on the basis of developing new PPS materials and new synthesis methods of PPS, we should also focus on the research and development of new modified materials and special materials, actively develop new modified PPS Composite materials, and establish larger scale production units as soon as possible Among them, the establishment of PPS resin production line of 5000-8000 tons / grade as soon as possible is the top priority for China's PPS development This is a necessary strategic measure for the development of high-performance structural materials in China It is of great significance to break the technical restrictions and blockades of foreign countries, and meet the needs of national economy and military industry in various fields of high-performance structural materials Synthesis method of linear high molecular weight polyphenylene sulfide (patent application No.: cn20061004358.3) (Public Announcement No.: cn1869104) Polyphenylene sulfide (PPS) is a new type of engineering plastics, which was put into production by Philips Petroleum Company of the United States in 1960s Later, Japan and Germany successively put it into production In the middle of 1960s, there were four research institutes in China to develop the product In the middle of 1980s, the product was listed in the "863" project and focused on development Later, the consulting report written by Chinese Academy of engineering and Chinese Academy of Sciences in 1999 also included this product, but stressed that it must be new materials, new processes and low cost, and it is expected to establish a production line with an annual output of 1500 tons in 2010 This patent basically solves the above-mentioned issues Why does this product attract the attention of political and scientific circles of all countries? Because it can not only replace a batch of metal materials, and in the production process, no exhaust gas, no harmful substance pollution, no smell, high safety, no explosion, the raw materials in production are easy to obtain PPS has a wide range of applications Due to its high temperature resistance, it can keep its original characteristics unchanged for a long time at 265 ℃ Flame retardant ul94-0, light weight, density of only 1.34g/cm3, good insulation performance, volume resistivity of 1 × 1016 Ω Cm surface resistivity of 1 × 1015 Ω Cm voltage strength > 18kV / mm, outstanding wear resistance, friction coefficient between 0.01-0.02, acid resistance, alkali resistance, oxidation resistance, high strength, water absorption (24 hours immersion at 23 degrees) 0.5%, injection molding shrinkage of 0.15% In particular, it can absorb the radiation of bullets and atomic bombs, which is the only ideal material found at present because