In recent years, the application with special type plastic project has been mixed from the war industry before gradually aerospace domain is outspread arrived more and more civil domains, for example car, equipment is made, high-end consumable. Among them, get together benzene sulfur aether (PPS) and get together ether aether ketone (PEEK) it is development the project of two kinds of special type with wider range of domain of rapidder, application is plastic.
PEEK makes the field such as temperature in intensity, tenacity, highest labour relatively PPS is more exceedingly good, be in high temperature resistant respect, of PEEK be able to bear or endure lukewarm sex makes an appointment with 50 ℃ than PPS tower above. And on the other hand, the cost advantage with relatively clear PPS and better treatment performance make its application range more wide.
PPS
PPS is crystallization model (the white of Gao Gang sex that crystallization spends 55%-65%) is pulverous polymer, hear resistance is tall (use temperature for a long time to be 200 ℃ - 220 ℃ , short-term can bear the high temperature) of 260 ℃ , it is a kind of mechanical intensity, tigidity, fire resistance properties, be able to bear or endure the colophony with excellent stability of chemical sex, electric character, dimension.
Actor of the wear-resisting, denaturation that fight squirm, anti-flammability actors or actress, have from extinguish sex. High temperature, tall wet next electric property that still keep good. Liquidity is good, yi Cheng, there is shrinkage cavity sunken spot almost when shaping. Have good endophilicity with all sorts of inorganic filling. Its development shortened the standard is thermoplastic plastic material (for example PA, POM, PET…… ) as plastic as advanced project the difference between.
PPS has the following and clear performance advantage:
(1) this asking for flame retardant
Differ with PC and PA, PPS pure colophony and its Bo fine / the composite material of mine pink fill falls in the condition that does not add any fire retardant, can achieve [email protected] easily the V-0 of thinner even ply is flame retardant level. Although PC and PA are having cheaper than PPS price and better mechanical strength (especially impact strength) , but added without bittern flame retardant recipe ([email protected] level) the cost of composite material meets PC and PA rise considerably however, a lot of moment have the PPS stuff of coequal and mechanical intensity to prep above very.
(2) freeboard fluidity
The field uses in jotter cover board, this dominant position is relative PC is more apparent. New generation is ultrathin jotter front shroud (the demand that ply 0.8-1mm) estimates to curving a model often is as high as 15000–) of 17000 MPa(ASTM standard. But in 3C industry severe cost control pressure falls, recipe stylist often is asked to choose the Bo fine with lower cost, is not carbolic fine serves as enhance filling. And to PC and its alloy character, the upper limit that its poorer fluidity decided to Bo fine adds a capacity shoulds not be commonly exceed 40 % (to curve modular quantity to be able to achieve 10000 MPa only, ASTM standard) . It is difficult that taller accretion measures the fluidity besides material of can serious effect to cause treatment outside, still can produce exterior float minute, warp is serious, mechanical function becomes poor to wait for a problem. And to half crystalline PPS character, its very high liquidity can allow quantity of Bo fine fill to exceed 50 % easily, mix in all in high temperature melt at the same time in cramming the course that give, PPS photograph relatively at PC lower viscosity can make Bo fine experiences inferior rate cut and squash, have longer reservation length in fixing the product that model shapes finally thereby, achieve the result that promotes a model the volume further.
(3) exceed low bibulous rate
This advantage basically is in the light of PA character. With respect to fluidity character, the PA of expensive stuff and PPS are about the same; And to mechanical function, the PA that coequal fill measures composite material even more dominant. But besides having the limitation with flame retardant bittern, another element that restricts PA application is its higher bibulous rate: Compare the bibulous rate of PA6T 0.6%-1% of high temperature nylon, the bibulous rate of PPS 0.03% is almost negligible not plan. The result that brings from this is PPS because goods is bibulous the PA product that the product fraction defective that be out of shape and arises wants to fall than coequal condition is low much.
(4) distinctive metallic simple sense and faster face hardness
PPS notes model to make decline when the desktop, can give out the very ringing collision sound with PPS particular place. Pass the collocation with tailor-made mould and logical lukewarm pattern, PPS notes model to make a sound that also can give out similar collision metal below the lay a finger on of hand, its surface also is met smooth like lens face, having the burnish like the metal.
PEEK
PEEK is a kind of integral performance admirable special type project is plastic, have good heat-resisting performance, be able to bear or endure chemistry is corroded function, anti-radiant function, report function, flame retardation. Its element catenary is a kind of polymer that with what be linked together by benzene annulus ketone radical, ether radical makes, made sure by benzene annulus PEEK material has very good tigidity, by ether key was made sure PEEK has very good tenacity, say so, PEEK is a when tenacity and tigidity have both omnibus material.
PEEK has following outstanding property:
(The hear resistance with extremely tall 1) .
Can use for a long time in 250°C, the instant uses temperature to be able to amount to 300°C, decompose scarcely inside 400°C short time.
(The mechanical performance with good 2) reachs dimension stability.
PEEK can retain higher strength below high temperature, the flexural strength when 200°C still can amount to 24 MPa, the flexural strength when 250°C and compress intensity to be able to amount to 12 ～ 13 MPa, particularly comfortable the component that can work continuously below high temperature at making. The tigidity of PEEK stability of tall, dimension is good reach a line to bilge coefficient is small, very adjacent at metallic aluminium. Additional, PEEK still is had be able to bear or endure goodly creep function, can bear inside operating period huge stress, won't arise because of the extension of time apparently outspread.
(3) is able to bear or endure admirably chemical sex.
Although be below high temperature,PEEK also can touch those who fight most chemistry material to corrode well, corrosion resistance and nickel steel close. Be in what normally the circumstance issues exclusive can deliquescent PEEK is thick vitriolic.
(4) is able to bear or endure hydrolysis performance is good.
Can resist water or the chemistry that high-pressured vapor produces are destroyed. Below high temperature and high-pressured condition, PEEK component can work continuously in water environment and still can maintain good mechanical performance. If immerse 200 days continuously in the water of 100°C, intensity keeps changeless almost.
(5) flame retardation is good.
Can reach level of UL 94 V-0, have from extinguish sex, the smoke that releases below blaze condition and toxic gas are little.
(6) report performance is good.
Inside very wide frequency and temperature limits, PEEK can hold electric property changeless.
(7) is anti-radiant capability is strong.
PEEK has very stable chemical structure, PEEK component falls to also can work normally in radiate of high dose ionization.
(8) tenacity is good.
Change to handing in the fatigue resistance of stress is all and plastic in the most conspicuous, can rival with alloy data phase.
(9) is able to bear or endure admirably attrition and wear-resisting caustic function.
Very tall wearability and low coefficient of friction can maintain in 250°C.
(10) processability can be good.
Squeeze easily go out and note model, and shape efficiency is tall.
