Polyphenylene oxide (PPO), also known as PPO B in Chinese, is one of the five general engineering plastics in the world. It has the advantages of high rigidity, high heat resistance, flame retardancy, high strength and excellent electrical performance. In addition, PPO also has the advantages of wear resistance, non-toxicity and pollution resistance. The dielectric constant and dielectric loss of PPO are among the smallest varieties of engineering plastics, and are almost unaffected by temperature and humidity. It can be used in low, medium and high frequency electric fields (the smaller the dielectric constant, the better the insulation). The loading deformation temperature of PPO can reach above 190℃, and the desorption temperature is-170℃. (PPO or PPE) is also called polyphenylene ether, and its chemical name is poly 2,6-dimethyl-1, 4- phenyl ether. It is a linear polymer formed by introducing oxygen into 2,6-dimethylphenol and carrying out oxidation condensation reaction under the action of catalyst.
It is usually khaki powder. Commonly used is polyphenylene ether synthesized from 2,6-dimethylphenol, which has excellent comprehensive properties, the biggest feature is excellent dimensional stability and outstanding electrical insulation under long-term load, and can be used for a long time in the range of-127 ~ 12 1℃. It has excellent water resistance and steam resistance, and the product has high tensile strength, impact strength and creep resistance. In addition, it also has good wear resistance and electrical properties.
Material properties:
1, white particles. It has good comprehensive performance, can be used in steam at 120℃, has good electrical insulation and low water absorption, but has a tendency to stress crack. Modified polyphenylene ether can eliminate stress cracking.
2. Excellent electrical insulation and water resistance, and good dimensional stability. Its dielectric properties rank first among plastics.
3.MPPO is a modified material made of PPO and HIPS*** (high impact polystyrene), and all the materials on the market at present are of this kind.
4. High heat resistance, glass transition temperature is 2 1 1 degree, melting point is 268 degrees, and it tends to decompose when heated to 330 degrees. The higher the PPO content, the better the heat resistance, and the thermal deformation temperature can reach 190 degrees.
5. Good flame retardancy, self-extinguishing, and moderate flammability after mixing with HIPS. Light weight, non-toxic, and can be used in food and medicine industries. Poor optical rotation resistance, long-term use in the sun will change color.
6. It can be modified with ABS, HDPE, PPS, PA, HIPS and glass fiber.
Use:
1, suitable for making heat-resistant parts, insulation parts, wear-resistant parts, transmission parts, medical and electronic parts.
2. Parts that can be used at higher temperature, such as gears, blades and valves, can be replaced by stainless steel.
3, can make screws, fasteners and connectors.
4. Electrical parts of motors, rotors, housings and transformers.
5.PPO and MPPO are mainly used in electronic appliances, automobiles, household appliances, office equipment and industrial machinery. Using the heat resistance, impact resistance, dimensional stability, scratch resistance and peeling resistance of MPPO.
6, paintability and electrical performance, used for automobile dashboard, radiator grille, speaker grille, console, fuse box, relay box, connector, wheel cover.
7. The electronic appliance industry is widely used to manufacture connectors, coil bobbins, mechanical parts shields, switch relays, tuning equipment, large electronic displays, variable capacitors, battery accessories, microphones and other parts.
8. Household appliances are used for TV sets, cameras, video tapes, tape recorders, air conditioners, heaters, rice cookers and other parts. It can be used as external parts of photocopiers, computer systems, printers, fax machines, etc.
9. In addition, it can also be used as the shell and parts of cameras, timers, water pumps and blowers, silent gears, pipes, valve bodies, surgical instruments, sterilizers and other medical equipment parts.
10, large-scale blow molding can be used to manufacture large-scale automobile parts such as spoilers, bumpers, low foam molding, etc. It is suitable for manufacturing large-scale products with high rigidity, good dimensional stability, excellent sound absorption performance and complex internal structure, such as various casings, bases, internal brackets, etc., with great design freedom and light weight.
Electronic appliances: can meet the requirements of excellent point insulation under wet, load and high temperature conditions, and can be used to prepare TV tuning boards, coil cores and microcircuits.
Wave insulation, shielding sleeve, high frequency printed circuit board. Various high-voltage electronic components, televisions, computers, fax machines, repeater housings.
Wait a minute.
Automobile industry: suitable for dashboard parts, window frames, shock absorbers, pump filters, etc.
Machinery industry: used as gears, bearings, pump impellers, blower impellers, etc.
Chemical field: used to manufacture corrosion-resistant parts such as pipes, valves, filters and submersible pumps.
Molding performance:
1. Amorphous substance with low hygroscopicity.
2. Poor fluidity, similar to Newtonian fluid, its viscosity is sensitive to temperature, the product thickness is generally above 0.8 mm ... It is easy to decompose, and corrosive gas is generated during decomposition. The molding temperature should be strictly controlled, the mold should be heated, and the resistance of the gating system to the material flow should be small.
3. The water absorption of polyphenylene ether is very low, about 0.06%, but a small amount of water will cause the surface of the product to be uneven, such as silver lines. It is best to dry it in the air, and the temperature should not be higher than 150 degrees, otherwise it will change color.
4. The molding temperature of polyphenylene ether is 280-330 degrees, and the molding temperature of modified polyphenylene ether is 260-285 degrees.