PVC tseem yog ib qho khoom siv ua haujlwm hauv kev tsim khoom, tab sis nws qhov Achilles 'heel - thermal degradation thaum lub sijhawm ua tiav - tau ua rau cov neeg tsim khoom muaj teeb meem ntev.kua calcium zinc PVC stabilizers: ib qho kev daws teeb meem uas daws cov teeb meem nyuaj tshaj plaws ntawm cov khoom siv thaum ua kom cov khoom tsim tau yooj yim. Cia peb piav qhia seb cov tshuaj ntxiv no hloov pauv PVC kev tsim khoom li cas.
Nres Kev Ua Kom Kub Hnyiab Hauv Nws Txoj Kev
PVC pib lwj thaum kub txog li 160°C, tso cov pa roj HCl uas ua rau cov khoom puas tsuaj thiab ua rau cov khoom tawg lossis hloov xim. Cov tshuaj stabilizers calcium zinc ua haujlwm ua lub tiv thaiv, ncua kev lwj los ntawm kev ua kom HCl tsis muaj zog thiab tsim cov khoom sib xyaw ruaj khov nrog cov saw polymer. Tsis zoo li cov tshuaj stabilizers ib leeg uas ploj mus sai, cov tshuaj kalium-zinc combo muab kev tiv thaiv ntev dua - ua kom PVC ruaj khov txawm tias thaum lub sijhawm extrusion ntev ntawm 180-200°C. Qhov no txhais tau tias tsawg dua cov pawg tsis lees paub vim yog daj lossis tawg, tshwj xeeb tshaj yog hauv cov khoom nyias nyias xws li zaj duab xis thiab ntawv.
Tshem tawm cov teeb meem kev ua haujlwm
Cov chaw tsim khoom paub txog qhov kev ntxhov siab ntawm kev kaw cov kab ntau zaus. Cov tshuaj stabilizer ib txwm muaj feem ntau tso cov khoom seem rau ntawm cov pwm thiab cov ntsia hlau, ua rau yuav tsum nres ntxuav txhua 2-3 teev. Txawm li cas los xij, cov mis kua zinc muaj cov viscosity qis uas ntws zoo los ntawm cov khoom siv, txo qhov sib sau ua ke. Ib tus neeg tsim cov yeeb nkab tau tshaj tawm tias txo lub sijhawm ntxuav los ntawm 70% tom qab hloov pauv, ua rau cov zis txhua hnub nce 25%. Cov kua kuj sib xyaw sib npaug nrog PVC resin, tshem tawm cov khoom sib sau ua ke uas ua rau cov tuab tsis sib xws hauv cov profiles lossis cov yeeb nkab.
Ua kom muaj kev ruaj khov ntawm cov khoom kawg
Nws tsis yog hais txog kev tsim khoom xwb - kev ua tau zoo ntawm kev siv kawg kuj tseem ceeb. Cov khoom siv PVC kho nrogcov tshuaj calcium zinc stabilizersqhia tau tias nws tiv taus tau cov teeb UV thiab cov dej noo zoo dua, ua rau nws siv tau ntev dua rau sab nraum zoov xws li cov thav qhov rais lossis cov kav dej hauv vaj. Hauv cov khoom siv uas yoog tau xws li cov gaskets lossis cov kav dej kho mob, cov stabilizer no tswj tau qhov elasticity dhau sijhawm, tiv thaiv kom tsis txhob muaj qhov tawv uas ua rau xau lossis ua tsis tiav. Kev sim qhia tau tias cov khoom no khaws tau 90% ntawm lawv lub zog tensile tom qab 500 teev ntawm kev laus sai, ua tau zoo dua li cov uas ua los ntawm cov khoom ntxiv ib txwm muaj.
Ua tau raws li cov qauv kev nyab xeeb nruj
Kev tswj hwm kev cai lij choj tau nce siab rau cov khoom siv PVC uas muaj kev nyab xeeb dua, tshwj xeeb tshaj yog rau cov khoom siv sib cuag nrog zaub mov lossis cov khoom siv kho mob. Cov kua zinc stabilizers ua los ntawm cov kua no yog cov khoom siv zoo tshaj plaws: lawv tsis muaj cov hlau hnyav xws li txhuas lossis cadmium, thiab lawv qhov kev hloov pauv qis ua rau lawv ua raws li FDA thiab EU 10/2011 cov cai. Tsis zoo li qee cov organic stabilizers uas leach cov tshuaj, cov mis no tseem nyob hauv cov polymer matrix—qhov tseem ceeb rau cov ntawv thov xws li cov khoom ntim zaub mov lossis cov khoom ua si rau menyuam yaus.
Siv Tau Zoo Tsis Muaj Kev Txom Nyem
Kev hloov mus siv cov khoom ntxiv zoo tshaj plaws feem ntau txhais tau tias tus nqi siab dua, tab sis tsis yog ntawm no. Cov kua calcium zinc stabilizers xav tau 15-20% tsawg dua li cov khoom siv khov kom ua tiav cov txiaj ntsig zoo ib yam, txiav cov nqi khoom siv raw. Lawv qhov kev ua haujlwm zoo kuj txo cov kev siv hluav taws xob: kev ua haujlwm du dua txo qhov kub ntawm extrusion los ntawm 5-10 ° C, txo cov nqi hluav taws xob. Rau cov chaw tsim khoom me me mus rau nruab nrab, cov nyiaj txuag no sib sau ua ke sai sai - feem ntau rov qab tau tus nqi hloov pauv hauv 3-4 lub hlis.
Cov lus qhia meej meej: cov kua calcium zinc stabilizers tsis yog tsuas yog kho cov teeb meem PVC xwb - lawv txhais dua qhov ua tau. Los ntawm kev sib xyaw ua ke kev tiv thaiv thermal, kev ua haujlwm zoo, thiab kev nyab xeeb, lawv tab tom dhau los ua qhov kev xaiv mus rau cov neeg tsim khoom uas tsis kam txi qhov zoo rau tus nqi. Hauv kev ua lag luam uas kev ntseeg tau thiab kev ua raws li txoj cai tsis tuaj yeem sib tham tau, cov khoom ntxiv no tsis yog kev hloov kho tshiab xwb - nws yog qhov tsim nyog.
TOPJOY TshuajLub tuam txhab yeej ib txwm mob siab rau kev tshawb fawb, kev txhim kho, thiab kev tsim cov khoom siv PVC stabilizer zoo. Pab pawg R&D tshaj lij ntawm Topjoy Chemical Company tseem niaj hnub tsim kho tshiab, ua kom zoo dua cov qauv khoom raws li kev xav tau ntawm kev ua lag luam thiab kev txhim kho kev lag luam, thiab muab cov kev daws teeb meem zoo dua rau cov tuam txhab tsim khoom. Yog tias koj xav paub ntxiv txog PVC stabilizers, koj tuaj yeem tiv tauj peb txhua lub sijhawm!
Lub sijhawm tshaj tawm: Lub Xya Hli-21-2025