Polyphenyl sulfide granula
Polyphenyl sulfide granula
CAS: 25212-74-2
Molecular Formula: (-C6H4-4-S-)n
Polyphenyl sulfide granula - Names and Identifiers
Polyphenyl sulfide granula - Physico-chemical Properties
| Molecular Formula | (-C6H4-4-S-)n |
| Density | 1.36g/mLat 25°C |
| Melting Point | 285-300°C |
| Appearance | powder |
| Storage Condition | RT, closed, dry |
Polyphenyl sulfide granula - Risk and Safety
| Safety Description | 24/25 - Avoid contact with skin and eyes. |
| WGK Germany | 3 |
Polyphenyl sulfide granula - Nature
Open Data Verified Data
The properties of polybenzenes vary depending on the preparation method. It generally has the following characteristics. High thermal stability, the decomposition temperature of 530 deg C, 500 deg C in air heating 30min weight loss of 5%, the thermal stability of polyimide, Polytetrafluoroethylene is excellent. Long-term use at 300 °c. The radiation resistance is good, and the intensity of the 60 Co radiation source l07 Gy(109 rad) is not changed. Polystyrene is insoluble in any solvent except concentrated nitric acid and pyridine, and its performance is almost unchanged in other chemical reagents for thousands of hours. In particular, it is much better than polyimide in terms of alkali resistance. Even hydrofluoric acid at 90 °c has no corrosive effect on it. Insoluble infusible polystyrene powder in 68.6~88. The properties of the molded products sintered at 400 ℃ for 8H under 2MPa pressure are as follows: Relative density 1. 23~1.25, tensile strength 6. 27~13. 72MPA, elongation 8%~ l2%, tensile modulus 151. 9MPa, Shore hardness 60~80, volume resistivity 2 × l015 Q.cm, dielectric strength 27 MV/m. Impregnating the solution of the soluble and fusible polystyrene prepolymer with the crosslinking agent and the solvent, impregnating the reinforced material such as the stone cotton product, cross-linking and molding under the appropriate temperature and pressure, thus, an asbestos laminate having a polystyrene content of 48% to 52% was obtained.
Last Update：2024-01-02 23:10:35
Polyphenyl sulfide granula - Preparation Method
Open Data Verified Data
There are many synthetic methods of Poly benzene, from the synthesis process and product performance, there is a one-step direct preparation of high molecular weight insoluble infusible benzene and two-step synthesis of low molecular weight soluble fusible prepolymer, and then further cross-linked into insoluble melt.
- a one-step synthesis method a polymerization reaction was carried out at 80 ° C. In the presence of a catalyst AICl3 and an oxidant CuCl2, using benzene as a raw material. The reaction mixture was filtered, washed with benzene, boiled with dilute hydrochloric acid and water repeatedly, washed and dried to obtain insoluble, infusible polystyrene. In addition, the use of p-chlorobenzene as a monomer, metal potassium, sodium as a catalyst, p-xylene as a solvent, solution polymerization at 95 deg C, can also be high molecular weight insoluble polymer benzene.
- two-step synthesis using isophthalyldisulfonyl chloride and terphenyl as raw materials, isophthalyldisulfonyl chloride was slowly added dropwise to the molten Terphenyl with stirring, the reaction is carried out at 300 to 310 ° C. Until the gas of HCL and S02 is discharged, and a brittle polystyrene prepolymer having a molecular weight of 800 to 1800 is obtained. It has good solubility, and can be used as a cross-linking agent, such as isophthalyldisulfonyl chloride or p-phenylenediamine, P-phenylenediethynyl benzene, etc., to form an insoluble polymer.
Last Update：2022-01-01 11:09:33
Polyphenyl sulfide granula - Use
Open Data Verified Data
Because of its good resistance to thermal oxidation, radiation resistance, chemical resistance and ablation resistance, it can be used in composite laminates such as asbestos, carbon fiber and stone fiber for rocket engine components, high-speed [(1~2)× l04 r/min] bearings operating at 300 ℃, regulating parts in the atomic reactor, radiation-resistant, heat-resistant and oxidation-resistant structures and for use as bearing elements and chemical equipment in corrosive environments. The self-lubricating property of polystyrene is better than that of molybdenum disulfide and graphite, and a small amount of polystyrene filled in Polytetrafluoroethylene can be used as compressor sealing ring, various bearing shells, shaft sleeves, etc. The heat resistance of rubber can be improved by adding a small amount of polystyrene. Polystyrene can also be used as high temperature ion exchange resin, high temperature resistant, radiation resistant coating and adhesive.
Last Update：2022-01-01 11:09:34
Polyphenyl sulfide granula - Molding Process
Open Data Verified Data
The processing method of soluble polystyrene is to dissolve the prepolymer and the cross-linking agent isophthalyldisulfonyl chloride or terephthalic methanol in chloroform, and to impregnate the reinforcing material such as asbestos and carbon fiber into the polystyrene prepolymer solution, after saturation, it was dried in 2. 94 ~ 6.86MPa and 300 deg C under the condition of press molding, and then after curing (275 deg C 24H, 300 deg C 24H, 325 deg C 24H), can be prepared with good performance of polystyrene composite materials. Attention should be paid to the release of harmful gases during processing. The insoluble and infusible polybenzenes need to be processed by a method similar to powder metallurgy. If plasma spraying and other methods can be obtained by Poly benzene coating.
Last Update：2022-01-01 11:09:34
Polyphenyl sulfide granula - Reference Information
| special engineering plastics | polyphenylene sulfide (PPS) is a special engineering plastic with excellent performance, with excellent high temperature stability, flame retardancy, chemical resistance and good mechanical and electrical properties. It has been internationally recognized as the filter material of choice for flue gas bag dust removal in coal-fired power plants. At the same time, it has been applied in a wide range of civilian and military products such as flame retardant heat insulation of aircraft and dielectric insulation in the electronic industry, and has become an important member of high-tech fibers. It is an indispensable new material in my country's economic development and national defense construction. Sichuan Deyang Technology Co., Ltd. is a high-tech enterprise specializing in the research and development and production of polyphenylene sulfide (PPS) resins and series of products. The PPS produced has the characteristics of high strength, high modulus, corrosion resistance, insulation, flame retardant, high temperature resistance, etc. With a number of independent intellectual property rights, the company built my country's first thousand-ton pressurized synthetic linear high-molecular-weight polyphenylene sulfide resin production line in 2002 with a polymerization production capacity of 1420 tons/year, making China a successor to the United States and Japan. The third country to realize the industrialization of polyphenylene sulfide. In recent years, the company has continuously expanded the production scale of PPS resin, building 4000 tons/year and 6000 tons/year units in Chengdu and Deyang respectively. In 2008, a new 20000-ton/year unit was built, and the total unit size has reached 30,000 tons/year. At present, the company's total production capacity of synthetic polyphenylene sulfide (PPS) resin ranks first in the world, and its industrial development has a solid foundation. the company has mastered the core technology of polyphenylene sulfide industrial production and won the first prize of scientific and technological progress in Sichuan province. For the first time, the whole process of localization of PPS from resin to fiber has been realized, filling the gap of domestic industrialization. In 2010, the company's polyphenylene sulfide (PPS) fiber project won the second prize of National Science and Technology Progress Award. Combining these, it is the right choice to give priority to the development of polyphenylene sulfide. |
| mechanical properties | pure polyphenylene sulfide (PPS) has low mechanical properties, especially low impact strength. After reinforced with glass fiber, the impact strength will be greatly improved, from 27J/m to 76J/m, an increase of 3 times; The tensile strength increased from 6Mpa to 137Mpa, an increase of 1 times. PPS has high rigidity and is rare in engineering plastics. The bending modulus of pure PPS can reach 3.8Gpa, and it can reach 12.6Gpa after inorganic filling modification, an increase of 5 times. However, PPO, which is famous for its rigidity, is only 2.55Gpa and PC is only 2.1Gpa. PPS has good creep resistance and high hardness under load. The wear resistance is high, and the wear amount during 1000 rotation is only 0.04g, which will be further improved after filling F4 and molybdenum disulfide. PPS also has certain self-lubricating property. The mechanical properties of PPS have little sensitivity to temperature. |
| thermal properties | PPS has excellent thermal properties, can withstand 260 ℃ for a short time, and can be used for a long time at 200~240 ℃; Its heat resistance is equivalent to PI, second only to F4 plastic, which is also rare in thermosetting plastics. |
| electrical properties | polyphenylene sulfide (PPS) has outstanding electrical properties. compared with other engineering plastics, its dielectric constant and dielectric loss tangent values are relatively low, and it does not change much in a large frequency, temperature and temperature range. PPS has good arc resistance and is comparable to thermosetting plastics. PPS is commonly used in electrical insulation materials, and its dosage can account for about 30%. |
| environmental performance | one of the biggest characteristics of PPS is good chemical resistance, and its chemical stability is second only to F4. PPS is stable to most acids, esters, ketones, aldehydes, phenols, aliphatic hydrocarbons, aromatic hydrocarbons, chlorinated hydrocarbons, etc., and is not resistant to chlorinated biphenyls and oxidizing acids, oxidants, concentrated sulfuric acid, concentrated nitric acid, aqua regia, hydrogen peroxide and sodium hypochlorite. PPS has good radiation resistance. |
| introduction to application fields | automobile industry: polyphenylene sulfide (PPS) is used in the automobile industry, accounting for about 45%, mainly used in automobile functional parts; For example, it can replace metal to make exhaust cylinder circulation valve, water pump impeller, pneumatic signal regulator, etc. Electronic appliances: Polyphenylene sulfide (PPS) can account for 30% in the electronic and electrical industry. It is suitable for high-temperature electrical components with ambient temperature higher than 200 ℃; it can manufacture point rinse, electric rinse brackets, and starter on generators and engines. Coils, shields and blades, etc.; on televisions, it can be used for high-voltage housings and sockets, terminals and terminal boards, etc.; in the electronics industry, manufacturing transformers, blockers and relays, skeletons and housings, integrated circuit carrier; Use high frequency performance to manufacture H-class bobbin and trimming capacitor, etc. Machinery industry: used for shells, structural parts, wear-resistant parts and sealing materials, specifically pump bodies, valves, bearings, bearing brackets, piston rings and gears. |
| crosslinking method | polyphenylene sulfide (PPS) provided by resin manufacturers is a white powder with low relative mass ratio (4000~5000) and high crystallinity (75%). this pure PPS cannot be directly plasticized and can only be used for spraying. PPS used for plasticization molding must be cross-linked and modified to increase the viscosity of the melt. Generally, the melt index after cross-linking is 10~20. The melt index of glass fiber reinforced PPS can be larger, but not larger than 200. there are two crosslinking methods for PPS: thermal crosslinking and chemical crosslinking. currently, thermal crosslinking is the main method. The crosslinking temperature of thermal crosslinking is 150~350 ℃, no crosslinking occurs below 150 ℃, and high crosslinking occurs above 350 ℃, which leads to processing difficulties. Chemical crosslinking requires the addition of crosslinking promoters. The specific varieties include zinc oxide, lead oxide, magnesium oxide, cobalt oxide, etc., as well as phenolic compounds, hexamethoxymethyl melamine, hydrogen peroxide, Hypochlorite of alkali metal or alkaline earth metal, etc. although PPS is crosslinked, its fluidity does not decrease much. Therefore, the waste can be reused three times. PPS itself has mold release property, so it is not necessary to add mold release agent. PPS can improve crystallinity and thermal deformation temperature after heat treatment. The post-treatment conditions are: temperature 204 ℃, time 30min. |
| processing method | injection molding universal injection molding machine can be used, and the melt index of glass fiber reinforced PPS should be 50. The process conditions of injection molding are as follows: barrel temperature, pure PPS 280~330 ℃,40% GFPPS 300~350 ℃; Nozzle temperature, pure PPS 305 ℃,40% GFPPS 330 ℃; Mold temperature 120~180 ℃; Injection pressure, 50 ~ 130MPA. Extrusion exhaust extruder is adopted, and the process is as follows: the temperature of feeding section is less than 200 ℃; The temperature of the barrel is 300~340 ℃, the temperature of the connecting body is 320~340 ℃, and the temperature of the die is 300~320 ℃. Molding It is suitable for large-scale products. It is compressed twice, cooled first, and then hot pressed. The preheating temperature of hot pressing is about 360 ℃ for 15min for pure PPS and 380 ℃ for 20min for GFPPS. The molding pressure is 10 ~ 30Mpa, and the molding is cooled to 150 ℃ for demoulding. Spraying molding adopts suspension spraying method and suspension spraying method and dry powder thermal spraying method. PPS is sprayed on the metal surface, and then plasticized and quenched to obtain the coating. The coating treatment temperature of PPS is above 300 ℃, and the temperature is kept for 30min. |
| use | used as engineering plastics to manufacture auto parts, mechanical parts, etc., and can also be used for anti-corrosion coatings, adhesives, electrical insulation materials, etc. |
Last Update：2024-04-09 15:16:49
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Product Name: Polyphenyl sulfide granula Request for quotationCAS: 25212-74-2
Tel: +86-17551318830
Email: r@reformchem.com
Mobile: +86-17551318830
QQ: 3787852685
Spot supply
Product Name: Polyphenyl sulfide granula Request for quotationCAS: 25212-74-2
Tel: 17505222756
Email: pules.cn@gmail.com
Mobile: +86-17551318830
Wechat: 17505222756
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