Five types of high temperature resistant engineering plastics
High temperature resistant engineering plastic is a kind of plastic that can maintain its own high mechanical properties under high temperature conditions because of its own special structure;
Generally have the following categories: PPO, PPS, PSF, modified PSF, polyaromatic sulfone, polyaromatic grease. In this kind of materials, their structure has a high rigidity of benzene ring, but also has a difficult oxidation of oxygen group, sulfur group, sulfone group, this combination, attached to their high temperature resistance and high rigidity.PPO
PPO (polyphenylene oxide) is an amber transparent material with a specific gravity similar to that of water at 1.06.
1, the combustion characteristics of
flame retardant, away from the fire out, after the flame is thick black smoke, plastic melt when sent flowers and smelly.
>2, the biggest advantage has the highest glass transition temperature of hot plastic plastic 210¡æ, therefore, its high temperature resistance is very high; PPO has the ability to boil water at high temperature, no deformation, no decomposition. PPO is hard and tough, and has high creep resistance. Its surface hardness is higher than PAPOMPC, and its creep is lower than these three materials; It still has good extensibility at lower temperature -135¡æ; Size stability PPO can be metallized, that is, can be electrochromic or vacuum coating PPO dielectric properties are excellent, in a wide range of frequencies, temperature, humidity, can be maintained constant. 3 and disadvantages PPO in the case of organic solvent, there will be a stress cracking PPO is not resistant to climate, vulnerable to sun discoloration. PPO poor fluidity, difficult to process Due to the above advantages, PPO is most suitable for wet and loaded in the case, that is, the need for excellent dielectric properties, but also have high mechanical properties, And the size is stable occasions: such as tuner, microwave insulation and so on. Water treatment equipment, water distillation equipment, water pump parts resistant to cooking equipment, such as: Medical equipment, food materials, high stiffness, high strength electrical housing and other parts, it is a more advanced housing material than PC
In addition, NORYL is a modified product of PPO. Compared with PPO, its mechanical properties decline a lot, but it can also be compared with PC. Can replace
PPSPPS (polyphenylenesulfide) is a kind of white material, it is high crystallinity, hard and brittle, excellent thermal stability, can be thermosetting plastic characteristics of high tolerance. Pure PPS can not be injection molding, because its viscosity is too large, not easy to flow, injection molding PPS are modified, with a lot of fillers and modifiers, that is to say, injection molding PPS is modified PP S.1, the combustion characteristics of
non-combustible, away from the fire after out. But when they beat each other, they emit a metallic "jingle" sound.
2, biggest advantage
under high temperature, the ability of any solvent corrosion;
PPS high creep resistance, other mechanical properties are relatively high;
PPS can maintain its mechanical properties and dimensions at high temperature;
PPS has excellent dielectric properties, which can be kept constant at a wide range of frequencies, temperatures and humidity.
3 and disadvantages
PPS illiquid, difficult processing
4, use
as a result of the above advantages, PPS is most suitable for high temperature and humidity and under load, do insulation, anti-corrosion and insulation material
5, injection performance PPS is a crystalline plastic, has an obvious melting point, melting at 280¡æ, but its viscosity is large, It is difficult to effectively flow and decompose at 400 ¡ã C; The general processing temperature is 300¡æ--340¡æ; PPO water absorption, in the case of moisture, can cause decomposition, need to dry, Can be dried at 140¡æ 2-4 hours can
1, burning characteristics 2, biggest advantage has outstanding resistance to high temperature and low temperature performance; At 150 ¡ã C, it can still maintain 80% of its mechanical strength, at -100 ¡ã C, it can also maintain 75% of its mechanical strength; PSF has outstanding creep resistance, which makes it maintain a variety of mechanical strength lasting; PSF has outstanding high temperature dielectric properties, at 190¡æ high temperature, in water, in moisture, can still maintain dielectric properties; PSF has outstanding radiation resistance; PSF can be metallized, that is, can be electroplating or vacuum coating PSF in the absence of hydrolysis, but in the case of high temperature and load, Water will cause it to appear stress cracking PSF poor fluidity, difficult to process Due to the above advantages, PSF is most suitable for manufacturing with precision tolerances, rigid, Thermal stability and good electrical insulation performance of electrical and electronic components. PSF is most suitable for manufacturing parts that need to have thermal properties, chemical resistance, durability and rigidity PSF is not easy to hydrolyze at low temperatures, and can also be used to manufacture parts of low temperature water treatment equipment, parts of water pumps, water valves, washing machine accessories, etc. It is more advanced than PC high rigidity shell material aromatic ester aromatic ester is a kind of transparent material. 1, the combustion characteristics of can burn, self-extinguishing after away from the fire. A small amount of non-toxic smoke can be produced when burning. On behalf of the brand is: U - 100 2, biggest advantage aromatic ester without glass fiber enhancement which has excellent heat resistance. Polyaryl ester without adding flame retardants can be self-extinguishing, burning produce smoke, but non-toxic, in line with safety specifications. The thermal expansion coefficient of polyaryl ester is small, creep variable is small, hygroscopic property is small, and polyaryl ester is resistant to acid and oil. 3 and disadvantages polyester alkali and organic solvents 4, use as a result of the above advantages, Polyaryl ester is most suitable for household appliances 5, injection performance
aromatic sulfone
1, the combustion characteristics of
aromatic sulfone is a kind of transparent material, Poly (aromatic sulfone) is slightly heavier than poly (sulfone) It stands for :Astrel360.
2, biggest advantage
much higher heat resistance, heat distortion temperature and continuous use is higher than that of PSF around 100 ¡æ. The mechanical strength of poly (aromatic sulfone) is similar to that of polysulfone.
3 and disadvantages
aromatic sulfone illiquid, difficult processing
4, use
as a result of the above advantages, Do super high temperature resistant material use.
5, injection performance
aromatic sulfone is processing temperature is 320 ¡æ -- 410 ¡æ; Mold temperature 232¡æ-260¡æ; Its hygroscopicity is large, water absorption, must be dried before processing, drying conditions are: 260¡æ drying 2-4 hours can be.