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PPO/PPE (Polyphenylene ether)
Polyphenylene oxide (PPO/PPE)
Polyphenylene oxide (PPO)
1. Polyphenylene Oxide or Polyphenylene ether, or polyphenylene ether, abbreviated as PPO or PPE.
The market is mainly Modified Polyphenylene Oxide (MPPO), or MPPE (Modified Polyphenylene ether). But customarily, both polyphenylene ether and its modified blend polymers are called PPO or PPE.
Second, the characteristics and application of polyphenylene ether and modified polyphenylene ether (PPE, PPO)
(1) Characteristics of PPE and PPO
PPO is a kind of thermoplastic engineering plastics with excellent overall performance, outstanding electrical insulation and water resistance, good dimensional stability.
1. Dielectric performance ranks first among engineering plastics
The PPO resin has no strong polar groups in its molecular structure and its electrical properties are stable (wide temperature and frequency range remain good).
a. Dielectric constant: 2.6~2.8 (the smallest among engineering plastics);
b. Dielectric loss tangent: 0.008 to 0.0042 (almost unaffected by temperature, humidity, and frequency);
c. Volume resistivity: 1016 (the highest in engineering plastics).
2, good mechanical properties and thermal properties
a, PPO molecular chain contains aromatic ring structure, the strong sense of the molecular chain, the mechanical strength of the resin is high, the creep resistance is good (the influence of temperature change is small);
b, heat resistance: glass transition temperature 211 °C, melting point 268 °C.
3, excellent water resistance
PPO is an amorphous resin. In the normal temperature range, there are few molecular motions. There are no large polar groups in the main chain. The polarity of the dipole moment is not polarized. The water resistance is very good. It is the lowest water absorption in engineering plastics. . The physical properties of immersed in hot water for a long time still rarely decrease.
4, good flame retardancy, with self-extinguishing (flame is thick black smoke, plastic melting flower odor)
The oxygen index 29 of PPO is a self-extinguishing material, and the oxygen index 17 of HIPS is a flammable material. The combination of the two is moderately flammable. When flame retardant PPOs are manufactured, halogen-free flame retardants are not required. The addition of phosphorus-containing flame retardants can achieve UL94 standards.
5, low shrinkage, good dimensional stability; non-toxic, low density.
6, resistance to medium and light resistance
PPO is basically not corrosive to acids, alkalis, detergents, etc. Under stressful conditions, mineral oil, ketones, and ester solvents can cause stress cracking; for organic solvents such as aliphatic hydrocarbons, halogenated aliphatic hydrocarbons, aromatic hydrocarbons, etc. Will make it melt and dissolve; PPO weaknesses are poor lightfastness, long time in the sun or fluorescent lamps produce discoloration, color yellow, because the ultraviolet light can make aromatic ether chain split caused.
(2) Application of PPE and PPO
The performance of PPO determines the scope of its application and the scope of use:
1, MPPO density is small, easy to process, heat distortion temperature of 90-175 °C, there are different specifications of goods, dimensional stability, suitable for the production of office equipment, household appliances, computers and other boxes, chassis and precision components;
2. The dielectric constant and dielectric loss tangent of MPPO are the lowest among the five general-purpose engineering plastics: coil skeleton, tube holder, control shaft, transformer shield sleeve, relay box, insulation pillar, color TV line output transformer (FBT); Due to the influence of temperature and high wave number, especially high temperature resistance, it is suitable to make electrical insulation parts under wet and load conditions.)
3, MPPO's water resistance and hot water resistance is good, suitable for the production of water meters, pumps, textile mills used (requires resistance to cooking, long service life);
4, lithium-ion battery market: mobile phones, laptops, high-performance cameras, cameras, etc. need lithium-ion batteries (lithium-ion battery organic electrolyte packaging materials used in the past with ABS or PC, MPPO performance is better than the previous two);
5, MPPO automotive industry: instrumentation, protective bars, PPO and PA alloys, in particular, high-impact performance specifications for exterior components;
6, chemical industry: corrosion-resistant equipment;
7, instead of stainless steel and other metals: medical equipment, hot water tanks, exhaust fans.
Third, polyphenylene ether and modified polyphenylene ether (PPE, PPO) injection molding process
Since the performance and level of use of modified PPE and PPO are very different and their processing variables are also very variable, the following range should be adjusted accordingly:
1. Drying: 90°C-100°C /3-4Hr
2, injection temperature: 220-290 °C
3, mold temperature: 40-120 °C