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With China Plastic Machinery
With China Plastic Machinery
Polysulfone (PSU) is a family of linear thermoplastics formed by connecting three different chemical groups, a sulfone group (-SO2-), an ether bond and an isopropyl group, to a benzene ring or a phenylene group. There are four types of polysulfones: bisphenol A type polysulfone (PSF, also called ordinary polysulfone), polystyrene sulfone, polyether sulfone (PES) and aliphatic polysulfone. It is formed by condensing bisphenol A with 4,4'-chlorodiphenyl sulfone in a dimethyl sulfoxide solution with sodium hydroxide as a catalyst.
Polysulfone is a transparent yellowish particle with excellent heat resistance and can be used for a long time at -100-150¡æ. It has excellent mechanical and dielectric properties, good dimensional stability and self-extinguishing properties. It also has outstanding radiation resistance. It has poor weather resistance and UV resistance. The glass transition temperature of polysulfone is 185¡æ, and it can be used continuously at 160¡æ. The blending temperature is between 310-410¡æ, and it has excellent hydrolysis stability under hot and humid conditions. Although polysulfone has good resistance to inorganic acids, alkalis and salts, it can cause expansion and stress cracking. It can be dissolved in some organic solvents, such as ketones, chlorinated hydrocarbons, aromatic hydrocarbons, etc. Polysulfone also has excellent electrical properties, and can maintain high dielectric properties even in water, high humidity or high temperature of 190¡ãC.
Polysulfone can be used as high-strength, heat-resistant, creep-resistant structural parts, corrosion-resistant parts and electrical insulation parts, such as automotive parts, instrument parts, gears, plates, pipes, pump housings, etc.
English name: Polysulfone
English alias Polysulfone resin
Melting point: greater than 280¡æ
Density 1.24
Refractive index n20/D 1.633
Properties pellets
PSF is a slightly amber amorphous transparent or translucent polymer with excellent mechanical properties, high rigidity, wear resistance, high strength, and excellent mechanical properties even at high temperatures. Its outstanding advantages are -100~150¡æ, long-term use temperature of 160¡æ, and short-term use temperature of 190¡æ. It has high thermal stability, hydrolysis resistance, good dimensional stability, small molding shrinkage, non-toxic, radiation resistance, flame resistance, and extinguishing properties. It has excellent electrical properties in a wide range of temperature and frequency. It has good chemical stability. In addition to concentrated nitric acid, concentrated sulfuric acid, and halogenated hydrocarbons, it can resist swelling in general acids, alkalis, salts, and ketones and esters. Poor UV resistance and weather resistance. Poor fatigue resistance is the main disadvantage. PSF must be pre-dried to a moisture content of less than 0.05% before molding. PSF can be processed by injection molding, compression molding, extrusion, thermoforming, blow molding, etc. The melt viscosity is high, and viscosity control is the key to processing. After processing, it is advisable to perform heat treatment to eliminate internal stress. It can be made into precision-sized products.
1. Polysulfone is an amber transparent solid material with high hardness and impact strength, non-toxic, good heat resistance, cold resistance, aging resistance, and self-extinguishing properties. It can be used for a long time at -100--175 degrees. Resistant to corrosion by inorganic acids, alkalis, and salts, but not resistant to aromatic hydrocarbons and halogenated hydrocarbons.
2. The wear resistance of the material can be greatly improved by glass fiber reinforcement modification.
3. Polysulfone can be made into modified products of polysulfone by combining with ABS, polyimide, polyetheretherketone and fluoroplastics, mainly to improve its impact strength and elongation, solvent resistance, environmental resistance, processing performance and electroplating performance. Such as PSF/PBT, PSF/ABS, PSF+mineral powder.
4. Polysulfone can be used continuously in 300 ¡ãF steam. In 180 ¡ãF water, the maximum pressure is 13.8MPa (static load) and 17.2MPa (intermittent load). In order to maintain long-term transparency and impact resistance, the maximum pressure in 180 ¡ãF water is 3.5MP (static load) and 6.9MPa (intermittent load). The lower the water temperature, the higher the pressure it can withstand: for example, at 72 ¡ãF, the maximum pressure is 20.7MPa (static load) and 24.7MPa (intermittent load). At room temperature and 20.7MPa pressure, after 10,000 hours, the creep (strain) of polysulfone is only 1%. At 210¡ãF and 2.07MPa stress, after 1 year, the total strain is still less than 2%.
After long-term use at 300¡ãF, the strength and modulus of polysulfone increase by 10%, the insulation strength remains 90%, and the impact strength remains 70%. The tensile impact strength of polysulfone can reach 200. When exposed to high temperatures for the first few months, such as 300¡ãF, an annealing effect will occur, which can reduce its performance value by 30%. However, these properties remain constant during the two-year test period.
5. Polysulfone has good comprehensive electrical properties: despite the low dielectric constant and loss factor, it still has high dielectric strength and volume resistivity. And it can remain constant over a wide range of temperatures and frequencies (even microwave frequencies).
Polysulfone can be electroplated with nickel and copper and has a bonding strength of 20lb/in.
S24/25Avoid contact with skin and eyes.
Avoid contact with skin and eyes.
1. Suitable for making heat-resistant parts, insulating parts, wear-reducing and wear-resistant parts, instrument parts and medical equipment parts. Polysulfone is suitable for making low-temperature working parts.
2. Polysulfone is often used in the electronic and electrical industry to make integrated circuit boards, coil racks, contactors, sleeves, capacitor films, and high-performance alkaline battery shells.
3. Polysulfone is used in household appliances for microwave oven equipment, coffee heaters, humidifiers, hair dryers, cloth steam dryers, beverage and food dispensers, etc. It can also replace non-ferrous metals for precision structural parts of clocks, copiers, cameras, etc.
4. Polysulfone has passed the relevant specifications in the fields of medicine and food in the United States and can replace stainless steel products. Because polysulfone is resistant to steam, hydrolysis, non-toxic, resistant to high-temperature steam sterilization, highly transparent, and has good dimensional stability, it can be used as surgical tool trays, sprayers, fluid controllers, heart valves, pacemakers, gas masks, dental trays, etc.
PSF is mainly used in the electronics and electrical, food and daily necessities, automotive, aviation, medical and general industrial sectors to make various contactors, connectors, transformer insulation parts, thyristor caps, insulating sleeves, coil skeletons, terminals, printed circuit boards, bushings, covers, TV system parts, capacitor films, brush holders, alkaline battery boxes, and wire and cable coatings. PSF can also be used to make protective cover components, electric gears, battery covers, aircraft internal and external parts, spacecraft external protective covers, camera baffles, lamp parts, and sensors. It can replace glass and stainless steel to make steam dinner trays, coffee containers, microwave cookers, milk containers, milking machine parts, and beverage and food dispensers. In the field of health and medical equipment, there are surgical trays, sprayers, humidifiers, dental instruments, flow controllers, groovers and laboratory instruments. It can also be used for dental implants, with high bonding strength. It can also be used for chemical equipment (pump cover, tower outer protective layer, acid-resistant nozzle, pipeline, valve container), food processing equipment, dairy processing equipment, and environmental protection and infection control equipment.
Polyarylsulfone (PASF) and polyethersulfone (PES) have better heat resistance and still maintain excellent mechanical properties at high temperatures.
1. Amorphous material, high moisture absorption, water absorption rate 0.2%-0.4%, must be fully dried before use, and prevent re-absorption of moisture. Ensure that the water content is below 0.1%.
2. The molding performance is similar to PC, with poor thermal stability and begins to decompose at 360 degrees.
3. Poor fluidity, fast cooling, suitable for high temperature and high pressure molding. The mold should have sufficient strength and rigidity, with a cold well, short runners, and gate size of 1/2-1/3 of the wall thickness of the plastic part.
4. In order to reduce the internal stress of the injection molded product, the mold temperature should be controlled at 100-140 degrees. After molding, annealing treatment can be taken in a glycerol bath, 160 degrees, 1-5 minutes; or an air bath at 160 degrees, 1-4 hours. The annealing time depends on the size and wall thickness of the product.
5. Polysulfone is close to Newtonian in the molten state, similar to polycarbonate, and its fluidity is sensitive to temperature. Within 310 degrees to 420 degrees, the fluidity increases by 1 times for every 30 degrees increase in temperature. Therefore, the processing fluidity is mainly improved by increasing the temperature during molding.
According to the different main chain molecular structures, polysulfone plastics can be divided into polysulfone, polyarylsulfone and polyethersulfone. Generally speaking, the heat deformation temperature of polysulfone is 175¡æ, and it can be used for a long time between -100¡æ and 150¡æ, and it has excellent aging resistance at high temperature. Polyarylsulfone is one of the best varieties of heat-resistant engineering plastics. Its heat resistance is comparable to that of thermosetting high-temperature resistant polyimide. The load deformation temperature is 275¡æ, and the long-term use temperature is 275¡æ. It can maintain good mechanical properties and electrical insulation properties at -240¡æ-260¡æ. The performance of polyethersulfone is between polysulfone and polyarylsulfone. The load temperature is 203¡æ and the long-term use temperature is -100¡æ-180¡æ. Polysulfone plastics can still maintain good electrical insulation properties in a humid environment.
Machinery industry: used to manufacture watch cases and parts, copiers and camera parts, and used as hot water valves, refrigeration system appliances, transmission parts, etc. for food machinery. After adding wear-resistant fillers such as polytetrafluoroethylene or graphite, polysulfone plastic can be used as high-temperature load bearings, as well as piston rings, bearing cages, hot water measuring instruments, warm water pump bodies, impellers, etc.
Electronic appliances: It can be used to manufacture integrated circuit boards for televisions, audio equipment and computers, and can also be used to make shells of electronic and electrical equipment, electroplating tanks, sleeves and coil frames of oscilloscopes, capacitor films and wires, cable coatings, and various small precision electronic components. Polyarylsulfone can be used as C-class insulating material to make various high-temperature resistant coil frames, switches, connectors, etc. Polyethersulfone can also be used as coil bobbins, coil frames, miniature capacitors, etc. Glass fiber reinforced polyethersulfone can be used as thyristor insulators, miniature potentiometer shells and integrated circuit sockets, etc.
Transportation: It is used to manufacture dashboards, differential covers, guard plates, ball bearing cages, engine gears, thrust rings, etc. on automobiles; hot air ducts and frame windows on aircraft, etc.
Medical equipment: Due to its transparency and resistance to hot water, steam, ethanol and sanitation, it can be used to make gas masks, sterilizers for contact lenses, endoscope parts, artificial heart valves, artificial dentures, etc.; polyethersulfone can be made into artificial respirators, blood pressure test tubes, dental mirror brackets, syringes, etc. Polysulfone and polyethersulfone can also be made into ultrafiltration membranes and reverse osmosis membranes.
Indicator name P-7303 P-7302
Appearance Powdered granules Colored granules
Density/(g/cm3) . 1.24 1.26¡«1.34
Reduced viscosity (¦Ç) 0.52¡«0.65 0.45¡«0.51
Tensile strength/MPa¡Ý 73 73
Impact strength/(kJ/m2)¡Ý 314 206
Brinell hardness¡Ý 10 10
Martin heat resistance/¡æ 150 150
Foreign brands include P1700, 710 (USA).
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