Kev hloov kho lub cev ntawm Polypropylene
Ntxiv cov organic lossis inorganic additives rau hauv PP ( polypropylene ) matrix thaum lub sijhawm sib tov thiab sib xyaw kom tau txais cov khoom siv PP composite ua tau zoo. Cov txheej txheem tseem ceeb suav nrog kev hloov kho kev sau thiab kev hloov kho kev sib xyaw.
Kev hloov pauv hloov
Nyob rau hauv cov txheej txheem PP molding, fillers xws li silicates, calcium carbonate, silica, cellulose, thiab iav fibers yog ntxiv rau lub polymer los txhim kho tshav kub, txo nqi, nce rigidity, thiab txo molding shrinkage ntawm PP. Txawm li cas los xij, qhov cuam tshuam lub zog thiab elongation ntawm PP yuav txo qis. Cov iav fiber ntau, ua ib qho zoo heev inorganic non-metallic whisker, muaj tus nqi qis, zoo rwb thaiv tsev, kub tsis kam, corrosion kuj, thiab siab mechanical zog. Nws yog dav siv, thiab kev ua tau zoo ntawm PP hloov los ntawm iav fiber ntau yog txhim kho zoo. Txawm li cas los xij, thaum cov ntsiab lus iav fiber ntau nce txog 30%, cov khoom siv kho tshuab tuaj yeem txhim kho tau zoo. Kev sib ntxiv ntawm cov iav fiber ntau tuaj yeem ua rau tsis txaus impregnation ntawm qee cov iav fibers, ua rau kev sib txuas tsis zoo ntawm cov polymer matrix thiab iav fibers, ua rau txo qis hauv cov khoom siv sib xyaw. Ntxiv mus, raws li cov iav fiber ntau cov ntsiab lus nce, qhov ntws ntawm cov khoom sib xyaw txo qis, ua rau muaj teeb meem hauv PP molding thiab ua.
Kev hloov kho sib xyaw
Kev sib xyaw PP (polypropylene) nrog polyethylene, engineering plastics, thermoplastic elastomers lossis roj hmab los txhim kho kev ua haujlwm ntawm PP. Kev hloov kho sib xyaw ua tiav hauv cov cuab yeej ua haujlwm xws li cov khoom siv sab hauv, qhib mills, thiab extruders. Cov txheej txheem yog yooj yim los tswj, muaj lub voj voog luv luv, thiab tus nqi qis, thiab tuaj yeem txhim kho ntau yam khoom ntawm PP xws li colourability, processability, antistatic zog, thiab cuam tshuam tsis kam. Polymer blending tuaj yeem siv dav dav siv cov khoom zoo ntawm txhua qhov khoom, ua rau qhov tsis txaus ntawm txhua qhov khoom ntawm cov khoom, thiab txhim kho kev ua tau zoo ntawm cov khoom sib xyaw. Txawm li cas los xij, qhov kub thiab txias tsis kam thiab kev laus ntawm kev sib xyaw PP tseem tsis zoo. Thaum lub sij hawm kev hloov kho, shear quab yuam yuav ua rau qee qhov loj molecular chains raug txiav thiab tsim cov dawb radicals, uas tuaj yeem tsim cov kab mob los yog thaiv cov copolymers thiab ua tau zoo raws li kev sib raug zoo rau PP.
PP kev hloov kho thev naus laus zis tau nthuav dav heev rau daim ntawv thov ntawm cov khoom siv sib xyaw thiab txhim kho cov nqi-zoo ntawm cov khoom, txhawb nqa cov txheej txheem engineering ntawm PP, thiab nthuav dav nws daim ntawv thov ntau yam los ntawm cov yas yas mus rau engineering plastics. Nyob rau hauv xyoo tas los no, kev tshawb fawb thiab kev loj hlob ntawm PP hloov kho tshuab tau tsim sai heev, thiab ntau thiab ntau dua tshiab thev naus laus zis tau siv rau PP hloov kho, uas tau txhim kho qhov kev ua tau zoo ntawm PP thiab txuas ntxiv nthuav dav nws daim ntawv thov, nrog rau txoj kev loj hlob dav dav.
Txhim kho kev hloov kho
Ntxiv cov ntaub ntawv fiber ntau rau cov yas tuaj yeem txhim kho lub zog ntawm cov ntaub ntawv yas, yog li lub npe hloov kho qhov cuab lub zog. Cov ntaub ntawv nrog cov kab loj-rau-thickness piv tuaj yeem txhim kho qhov khoov modulus (rigidity) ntawm cov ntaub ntawv yas, uas tuaj yeem hu ua kev hloov kho qhov cuab lub zog.
Cov ntaub ntawv txhawb zog feem ntau yog siv rau hauv kev hloov kho ntawm PP (polypropylene) yog cov iav fiber ntau thiab nws cov khoom, nrog rau carbon fiber, organic fiber, boron fiber, whiskers, thiab lwm yam. feem ntau tsis yog-alkali iav fibers thiab nruab nrab-alkali iav fibers, nrog non-alkali iav fibers muaj qhov loj tshaj plaws. Txoj kab uas hla ntawm cov iav fibers yog tswj nyob rau hauv thaj tsam ntawm 6-15μm, thiab qhov ntev ntawm cov iav fibers yuav tsum tau lees tias nyob rau hauv 0.25-0.76mm, uas tuaj yeem ua kom muaj kev ua tau zoo ntawm cov khoom thiab ua rau cov iav fibers zoo dispersed.
Nws feem ntau ntseeg tias qhov ntev ntawm cov iav fibers hauv cov khoom yuav tsum siab dua 0.2 hli kom muaj kev hloov pauv. Cov iav fiber ntau cov ntsiab lus (feem ntau) yog qhov zoo tshaj plaws ntawm 10% thiab 30%, thiab qhov ua tau zoo txo qis thaum nws tshaj 40%. Tsis tas li ntawd, ntxiv cov organosilane coupling cov neeg ua haujlwm tuaj yeem ua rau cov iav fibers thiab PP tsim ib qho kev sib txuas zoo, txhim kho qhov khoov modulus, hardness, load deformation kub, thiab tshwj xeeb tshaj yog qhov seem stability ntawm cov khoom sib xyaw. Cov iav fiber reinforced PP tuaj yeem txhim kho cov neeg kho tshuab lub zog thiab kub ua haujlwm, thiab nws tsis kam rau cov dej vapor, tshuaj corrosion, thiab creep kuj zoo. Nws tuaj yeem siv los ua cov yas yas hauv ntau lub sijhawm, xws li cov kiv cua, cua sov grilles, impellers, lampshades, hluav taws xob furnaces, thiab cua sov vaj tse, thiab lwm yam.
Thaum lub sij hawm tsim cov polypropylene yog nce sai, nws cov kev ua tau zoo kuj tseem txhim kho, ua rau nws daim ntawv thov dav thiab qhov tob tsis tu ncua. Nyob rau hauv xyoo tas los no, ib co tshiab polypropylene ntau yam nrog cov khoom tshwj xeeb tau tshwm sim, xws li pob tshab polypropylene thiab high-melt-lub zog polypropylene, los ntawm kev txhim kho cov tshuaj tiv thaiv polymerization los yog ntsuas thaum lub sij hawm granulation tom qab polymerization.
