Nyob rau hauv xyoo tas los no, daim ntawv thov tshwj xeeb engineering plastics tau maj mam txuas ntxiv los ntawm yav dhau los tub rog thiab aerospace teb mus rau ntau thiab ntau cov pej xeem, xws li tsheb, khoom tsim, thiab high-end cov neeg siv khoom. Ntawm lawv, polyphenylene sulfide (PPS) thiab polyetheretherketone (PEEK) yog ob hom tshwj xeeb engineering yas nrog kev txhim kho sai thiab ntau yam kev thov.
PEEK yog superior rau PPS raws li lub zog, toughness, thiab siab tshaj plaws ua hauj lwm kub. Hais txog qhov kub thiab txias, PEEK qhov kub tsis kam yog li 50 ° C siab dua li ntawm PPS. Ntawm qhov tod tes, tus nqi tsim nyog tau txais txiaj ntsig thiab kev ua haujlwm zoo dua ntawm PPS ua rau nws siv ntau dua.
PPS muaj qhov ua tau zoo hauv qab no:
(1) Intrinsic nplaim retardant
Different from PC and PA, PPS pure resin and its glass fiber/mineral powder filled composites can easily achieve V-0 @ 0.8mm or even thinner thickness V-0 flame retardant without adding any flame retardant level. Although PC and PA have cheaper prices and better mechanical strength (especially impact strength) than PPS, the cost of PC and PA composites with halogen-free flame retardant formulations (V-0@0.8mm level) is higher than that of PPS. It will rise sharply, and in many cases even higher than PPS materials with the same mechanical strength.
(2) Ultra-high liquidity
Hauv daim ntawv thov teb ntawm phau ntawv npog, qhov kom zoo dua no pom tseeb dua li ntawm PC. Ib qho ntxiv ntau dua yuav tsis tsuas cuam tshuam qhov fluidity ntawm cov khoom thiab ua rau muaj teeb meem kev ua haujlwm, tab sis kuj ua rau muaj teeb meem xws li nto ntab fibers, warpage loj, thiab cov khoom tsis zoo. Rau semi-crystalline PPS, nws cov fluidity siab heev tso cai rau cov iav fiber ntau kom yooj yim tshaj 50%. Nyob rau tib lub sijhawm, nyob rau hauv cov txheej txheem kub melting melting thiab extrusion, qhov qis viscosity ntawm PPS piv rau PC tuaj yeem ua rau iav fibers tau qis qis ntawm shear thiab extrusion, uas ua rau lub sijhawm tuav ntev dua nyob rau hauv qhov kawg txhaj tshuaj molded tsab xov xwm, uas. ntxiv nce modulus.
(3) Ultra-tsawg nqus dej
Qhov txiaj ntsig no feem ntau yog rau PA. Nyob rau hauv cov nqe lus ntawm fluidity, siab puv PA thiab PPS yog sib piv; thiab rau cov khoom siv kho tshuab, PA composites nrog tib tus nqi filling yog qhov tseem ceeb dua. Qhov tshwm sim yog tias qhov tsis xws luag ntawm cov khoom PPS vim yog dej nqus deformation qis dua li ntawm cov khoom PA hauv tib lub sijhawm.
(4) Cov hlau tshwj xeeb kev ntxhib los mos thiab siab dua saum npoo hardness
Los ntawm kev sib xyaw ua ke ntawm cov pwm tshwj xeeb thiab pwm pwm tsim nyog, PPS txhaj tshuaj molding qhov chaw tseem yuav tawm suab zoo ib yam li ntaus hlau nyob rau hauv qhov kov ntawm tib neeg txhais tes, thiab qhov saum npoo yuav du zoo li daim iav, nrog cov hlau nplaum.
PEEK muaj cov khoom zoo hauv qab no:
(1) Kub kub tsis kam.
Nws tuaj yeem siv rau lub sijhawm ntev ntawm 250 ° C, qhov kub tuaj yeem ncav cuag 300 ° C hauv ib qho tam sim, thiab nws tsis yooj yim decomposes hauv lub sijhawm luv luv ntawm 400 ° C.
(2) Cov khoom siv kho tshuab zoo heev thiab qhov ruaj khov.
PEEK tuaj yeem tuav lub zog siab ntawm qhov kub thiab txias. Lub zog dabtsi yog khoov ntawm 200 ° C tuaj yeem ncav cuag 24 MPa, thiab lub zog dabtsi yog khoov thiab compressive zog ntawm 250 ° C tuaj yeem ncav cuag 12-13 MPa. Nws yog tshwj xeeb tshaj yog tsim rau kev tsim cov khoom txuas ntxiv ntawm qhov kub thiab txias. cov khoom ua haujlwm. PEEK muaj rigidity siab, zoo seem stability thiab tsawg coefficient ntawm linear expansion, uas yog heev ze rau hlau txhuas. Tsis tas li ntawd, PEEK kuj tseem muaj kev nkag siab zoo, tuaj yeem tiv taus kev ntxhov siab thaum lub sijhawm ua haujlwm, thiab yuav tsis ua rau muaj kev cuam tshuam loj vim lub sijhawm txuas ntxiv.
(3) Cov tshuaj tiv thaiv zoo heev.
PEEK tiv taus cov tshuaj feem ntau zoo, txawm tias qhov kub thiab txias, nrog corrosion kuj zoo ib yam li cov hlau nickel. Nyob rau hauv ib txwm muaj xwm txheej, tib yam uas yuav yaj PEEK yog concentrated sulfuric acid.
(4) Zoo hydrolysis tsis kam.
Resistant rau tshuaj puas los ntawm dej los yog high-pressure dej vapor. Nyob rau hauv cov xwm txheej ntawm qhov kub thiab txias siab, PEEK cov khoom tuaj yeem ua haujlwm tsis tu ncua hauv dej ib puag ncig thiab tseem muaj cov khoom siv zoo. Xws li txuas ntxiv rau hauv dej ntawm 100 ° C rau 200 hnub, lub zog tseem yuav luag tsis hloov.
(5) nplaim retardant kev ua tau zoo.
Nws tuaj yeem ncav cuag UL 94 V-0 qhov ntsuas, yog tus kheej tua, thiab tso pa tawm tsawg dua thiab cov pa roj carbon monoxide nyob rau hauv cov nplaim taws.
(6) Kev ua haujlwm hluav taws xob zoo.
PEEK tuav cov khoom hluav taws xob ntau zaus thiab qhov kub thiab txias.
(7) Muaj zog tiv thaiv hluav taws xob.
PEEK muaj cov qauv tshuaj ruaj khov heev, thiab PEEK qhov chaw tuaj yeem ua haujlwm zoo nyob rau hauv cov koob tshuaj ionizing hluav taws xob ntau.
(8) Zoo toughness.
Kev qaug zog tsis zoo rau kev sib hloov kev ntxhov siab yog qhov zoo tshaj plaws ntawm txhua yam yas thiab yog piv rau cov alloys.
(9) Kev sib txhuam zoo heev thiab hnav tsis kam.
High hnav tsis kam thiab qis coefficient ntawm kev sib txhuam yog khaws cia ntawm 250 ° C.
(10) Kev ua haujlwm zoo.
Yooj yim extrusion thiab txhaj tshuaj molding, thiab siab molding efficiency.
Post lub sij hawm: 01-09-22