Polyphenylene sulfide, PPS.

Chinese name: Polyphenyl thie ether is a new type of high-performance thermoplastic resin
polyphenyl thie ether is a crystalline polymerUnstretched fibers have a large amorphous region (about 5% crystalline), crystalline heating occurs at 125 degrees C, the glass temperature is 93 degrees C, and the melting point is 281 degrees CStretching fibers in the stretching process produced a partial crystallization , (increased to 30%), such as at 130-230 degrees C temperature heat treatment of the stretch fiber, can increase the crystalline to 60-80%Therefore, there is no obvious glass transformation or crystalline heating phenomenon of the stretched fiber, and its melting point is 284 degrees CWith the increase of crystallization after stretching thermal shape, the density of fiber swells, from 1.33g/cm3 before stretching to 1.34g/cm3 after stretching, and 1.38g/cm3 after heat treatmentPPS is a specialty engineering plastic with excellent combined performancePPS has excellent high temperature resistance, corrosion resistance, radiation resistance, flame retardant, balanced physical and mechanical properties and excellent dimensional stability, as well as excellent electrical properties, and is widely used as a structural polymer material, through filling, modification and widely used as a special typoAt the same time, a wide range of functional films, coatings and composites can be made for successful applications in electronics, aerospace, automotive transportation and other fieldsIn recent years, domestic enterprises actively research and development, and initially formed a certain production capacity, changed the past completely dependent on importsHowever, China's PPS technology still has fewer product varieties, fewer high-function products, production capacity to expand, these will be the focus of the next step of PPS developmentcharacteristics:has the advantages of high mechanical strength, high temperature resistance, high flame retardant, strong resistance to chemicals, etc, and has the advantages of hard and brittle, high crystallization, hard-burning, good thermal stability, high mechanical strength, good electrical performance and so onPPS is one of the best varieties of heat resistance in engineering plastics, the temperature of thermal deformation is generally greater than 260 degrees, chemical resistance is second only to Teflon, the mobility is second only to nylonin addition,, it also has the advantages of small molding shrinkage (about 0.08%), low water absorption rate (about 0.02%), good fire resistance, good vibration fatigue and other advantages : 1.36 g/cm300 000: 0.7% molding temperature: 300-330c
PPS plastic material performance 1, electrical insulation (especially high-frequency insulation) good white hard and brittle, fell on the ground with metal sound transmission rate second only to plexiglass colorresistance water-resistant chemical stability is good Has excellent flame retardant properties for non-combustible plastics 2, the strength of the general, rigid but fragile and fragile to produce stress brittle cracking and non-benzene and gasoline and other organic solvents Long-term use temperature up to 260 degrees, in 400 degrees of air or nitrogen remained stable By adding glass fiber or other reinforced materials modified, the impact strength can be greatly improved, heat resistance and other mechanical properties have also been improved, density increased to 1.6-1.9, forming shrinkage is small to 0.15-0.25% suitable for the production of heat-resistant parts PPS plastic molding performance 1 Amorphous material absorbs small but suitable for drying after forming 2 Fluidity is between ABS and PC, fast solidification, small shrinkage, easy decomposition, high injection pressure and injection speed The module temperature takes 100-150 degrees The main road cone should be large, the runner should be short PPS plastic disadvantages are large brittle, poor toughness, low impact strength, after improvement, can obtain very excellent comprehensive performance, the market for products are its improved products.
PPS plasticis is widely used in: electronic aspects: video, computer high-voltage components, housing, sockets, posts, motor starting coils, blades, brush carriers and rotor insulation components, contact switches, relays, electric irons, hairdryers, lamp heads, heaters, F-grade films and so on automotive industry: suitable for exhaust recirculating valves and pump impellers, as well as vaporizers, exhaust devices, exhaust control valves, light reflectors, bearings, sensing components, etc machinery industry: used as bearings, pumps, valves, pistons, precision gears, as well as copiers, cameras, computer components, conduits, sprayers, nozzles, instrumentation parts, etc chemical sector: for the production of acid and alkali resistant valve pipes, fittings, valves, gaskets and submersible pumps or impellers and other corrosion-resistant components the production of PPS abroad
the current global PPS resin production capacity has exceeded 50,000 tons / year, become the first largest variety of special engineering plastics and after the polycarbon, polyester, polyformaldehyde, nylon and polyphenyl ether and other five major engineering plastics after the sixth largest engineering plastic varieties Its production pattern is: only the United States, Japan and China master PPS resin industrial production technology, with production capacity and products Russia and India are actively engaged in the industrial production of PPS resin research and development Chevron Phillips, Wu Yu Chemical Industries (including Fortron) and Japan Ink Chemical Industry Are the World's Top Three PPS Resin Producers among the emerging PPS resin manufacturers and products, the development of the second generation linear polymer-weight PPS resin, which is produced and sold by Japan's Poly, is the most notable by The Japan Wuyu Chemical Industry Company and its Fortron PPS, a composite modification material produced and sold by Japan's Poly The resin production process advanced, good product quality, excellent performance, especially it has improved the PPS shock resistance poor, brittle fatal shortcomings In addition, FortronPPS can directly manufacture fibers and films, coupled with the light color of the resin, can be made into a variety of brightly colored products, thus becoming the development direction of PPS resin and widely welcomed Its production capacity has also expanded rapidly, becoming the two main brands of PPS resins, along with Ryton PPS Around 1990, due to the impact of the international economic environment, the average operating rate of PPS manufacturers in Japan remained 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 rate of construction has increased significantly Especially after 2004, although the price of crude oil continued to rise led to the price of PPS resin rose by 10%, but resin is still in short supply, companies are more full-power resin production At the same time, a number of companies are ready to expand production facilities, such as Chevron Phillips, Great Japan Ink Chemical Industry Corporation and The Petrochemical Industry Company have proposed the construction of 10,000 tons of production equipment international PPS compound grain manufacturers and product specifications, models, including the supply of China's main Chevron Phillips (including Toray-Phillips) Ryton PPS series, Japan's FortronPPS series and the large Japanese ink company DICPPS series the development of CHINA PPS
the research and production of PPS in China began in the early 1970s, more than 20 enterprises have established PPS resin synthesis pilot or production equipment, but the prevalence of low technical level, the technology is not the Fatal weakness in recent years, the domestic PPS composite materials production and development units more, such as Chenguang Chemical Research Institute, Beijing Chemical Research Institute, Guangzhou Chemical Research Institute, etc in PPS fiber enhancement, carbon fiber and inorganic mineral filling enhanced PPS molding processing and application areas, Beijing Glass and Steel Research Institute in continuous fiber enhancement preparation PPS composite sheet, Zhongshan University in PPS / carbon fiber composite stoic research has made great achievements However, the domestic composite grain production plant still has a small yield, a single variety of problems, mostly to the common varieties - glass fiber reinforced materials and inorganic filling modified varieties Some high-performance or special varieties of PPS composite granules and alloys are currently only A few units such as Sichuan Huato, Sichuan University have some products for sale PPS prospects and development goals
The total market demand for CHINA's PPS modification and compound grain is greater than 8000 tons/year, and the growth rate is rapid, with annual demand growth rate of up to 15%-20% Consumer PPS product models are still based on common varieties 0%-40% fiberglass fiber materials, the application of electrical and electronic appliances, precision machinery-based, in the automotive, motorcycle and petroleum, chemical sector consumption is also growing steadily With the rapid development of China's electronic seknows and automotive industry, the market prospect of PPS is very broad, and the market demand for PPS grains in China is expected to reach 10000 tons/year in 2005 A number of domestic and foreign manufacturers and investors are interested in involvement in PPS resin production lines or the construction of new PPS resin industrial production lines The Chinese 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 areas, and open up the international market is expected to see demand for PPS grow at an average annual rate of more than 10% in the next five years At present, the global PPS production and demand has become tight, with the development of society, the total demand for PPS in the automotive and electronics industry will be further expanded This provides opportunities for global PPS resin producers to expand production, as well as great opportunities for China's PPS industry combined with the development trend of PPS and new materials at home and abroad, in the development of new PPS material varieties, the development of PPS new synthesis methods on the basis of the development should also focus on the development of new modified materials and special materials, and actively develop new PPS composite material modified varieties, as soon as possible to establish a larger scale production device Among them, as soon as possible to establish 5000-8000 tons / grade PPS resin production line, is China's PPS development of the urgent task This is a necessary strategic measure for the development of China's high-performance structural materials, which is of great significance for breaking foreign technical restrictions and blockades and meeting the demand for high-performance structural materials in various fields of the national economy and military industry linear polymer-weight polyphenyl ether synthesis method (patent application number: CN20061004358.3) (public notice number: CN1869104) polyphenyl sulfur ether (PPS) is six A new type of engineering plastic invested by Philip Oil Company in the 10th, after japan and Germany have been put into production, China in the mid-1960s, there were four research institutes for the development of the product, into the mid-1980s, the product was included in the "863" project, and do key development Subsequently, the Chinese Academy of Engineering, the Chinese Academy of Sciences in 1999 in the written consultation report also included this product, but stressed the need for new materials, new technology, low cost, and is expected to set up an annual output of 1500 tons of production line in 2010, the patent basically solves the above-mentioned issues Why does this product attract the attention of political and scientific circles in various countries? Because it can not only replace a batch of metal materials, and in the production process, no emissions, no harmful substances pollution, no odor, high safety, no explosion, production of raw materials easy to obtain THE APPLICATION RANGE OF PPS IS EXTENSIVE, BECAUSE OF ITS HIGH TEMPERATURE RESISTANCE, CAN BE LONG-TERM STABILITY OF 265 DEGREES TO MAINTAIN THE ORIGINAL CHARACTERISTICS UNCHANGED Flame retardant UL94-0 class, light body, density is only 1.34g/cm3 insulation performance is good, volume resistance rate of 1 x 1016 s.cm surface resistivity 1 x 1015.cm voltage strength and 18Kv/mm The wear resistance is outstanding, the coefficient of friction is between 0.01-0.02, acid, alkali, oxidant, high strength, water absorption (23 degrees soaked for 24 hours) 0.5%, injection molding shrinkage 0.15% In particular, the ability to absorb the radiation of medium bullets, atomic bombs, is currently the only ideal material found Therefore, it is an indispensable protective material in the nuclear industry, because of the above characteristics, so PPS is the machinery industry, electronics, electrical industry, chemical industry in the ideal anti-corrosion coating Especially in aviation, aerospace, nuclear industry more prominent places Because of this technology ownership country to China's technical blockade, the quality of its export products, the quantity of strict control the patenter consulted a large number of documents in Japan, the United States, Germany and other countries more than 140 patents, and according to the Theory of Polymer Dynamics of Stanford University in the United States and Philip Oil's pilot analysis, to obtain their own process conditions and production control means only 50% yield in production according to stanford University's polymer dynamics theory, and based on Philip Oil's pilot results: the solvent N-methylpyrane is easily decomposed and difficult to control in production (the initial condition of strong alkali) This will require the search for conditions for greater efficiency and the addition of catalysts at the appropriate time for the reaction in order to be resolved In addition, a new solvent was found to replace the solvent N-methylpyritone The patent has been given the above-mentioned problems to solve, in the annual output of 40 tons of production has been verified (see test results), to obtain linear, high molecular weight, high crystalline polyphenyl sulfur ether, yield between 90-95% How to reduce air contact with sodium sulfide is also a key step, in order to prevent oxidation, sodium sulfide control in sodium sulfide is an important part of this product, take appropriate measures to control, can be carried out normal production because of the patent's use of tetrahydrohydroquinone as a solvent, and N-methylpyrane ketone ratio, is 0.454 times N-methylpyrane, thereby increasing the production equipment raw material filling, single kettle yield is also another manifestation of cost reduction This patent solves the above four major problems Therefore, the production cost is greatly reduced, with the leading international level, the above-mentioned conditions to draw the following conclusion: 1) raw material cost compared with the international rate of 1.5-16,000 yuan / ton ; conclusion is that it is strongly competitive in the international market China has its own intellectual property rights and is an international leader