PVC stabilizersyog cov additives siv los txhim kho thermal stability ntawm polyvinyl chloride (PVC) thiab nws cov copolymer. Rau cov khoom siv PVC, yog tias qhov ntsuas kub ntau tshaj 160 ℃, thermal decomposition yuav tshwm sim thiab HCl roj yuav raug tsim. Yog tias tsis muaj kev cuam tshuam, qhov thermal decomposition yuav ua rau hnyav ntxiv, cuam tshuam rau kev txhim kho thiab kev siv ntawm PVC yas.
Cov kev tshawb fawb pom tias yog cov yas PVC muaj me me ntawm cov hmoov lead ntsev, hlau xab npum, phenol, aromatic amine, thiab lwm yam impurities, nws cov txheej txheem thiab daim ntawv thov yuav tsis raug cuam tshuam, txawm li cas los xij, nws cov thermal decomposition tuaj yeem txo tau rau qee yam. Cov kev tshawb fawb no txhawb kev tsim thiab kev txhim kho txuas ntxiv ntawm PVC stabilizers.
Feem ntau PVC stabilizers muaj xws li organotin stabilizers, hlau ntsev stabilizers, thiab inorganic ntsev stabilizers. Organotin stabilizers tau siv dav hauv kev tsim cov khoom siv PVC vim tias lawv cov pob tshab, huab cua tsis zoo, thiab kev sib raug zoo. Hlau ntsev stabilizers feem ntau yog siv calcium, zinc, los yog barium ntsev, uas tuaj yeem muab cov thermal stability zoo dua. Inorganic ntsev stabilizers xws li tribasic lead sulfate, dibasic lead phosphite, thiab lwm yam. muaj lub sij hawm ntev thermostability thiab zoo hluav taws xob rwb thaiv tsev. Thaum xaiv qhov tsim nyog PVC stabilizer, koj yuav tsum xav txog cov ntaub ntawv thov ntawm PVC cov khoom thiab cov khoom yuav tsum tau muaj kev ruaj ntseg. Cov stabilizers sib txawv yuav cuam tshuam rau kev ua haujlwm ntawm cov khoom siv PVC lub cev thiab tshuaj lom neeg, yog li kev tsim qauv nruj thiab kev sim yuav tsum tau ua kom ntseeg tau tias qhov tsim nyog ntawm stabilizers. Cov ncauj lus kom ntxaws qhia thiab sib piv ntawm ntau yam PVC stabilizers yog raws li nram no:
Organotin Stabilizer:Organotin stabilizers yog qhov zoo tshaj plaws stabilizers rau PVC khoom. Lawv cov tebchaw yog cov tshuaj tiv thaiv ntawm organotin oxides lossis organotin chlorides nrog cov kua qaub lossis esters.
Organotin stabilizers muab faib ua sulfur-muaj thiab tsis muaj sulfur. Sulfur-containing stabilizers ' stability yog qhov zoo tshaj plaws, tab sis muaj teeb meem hauv kev saj thiab kev sib tsoo zoo ib yam li lwm cov tshuaj sulfur. Non-sulfur organotin stabilizers feem ntau yog raws li cov txiv neej acid lossis ib nrab ntawm cov txiv neej acid esters. Lawv nyiam methyl tin stabilizers tsis tshua muaj txiaj ntsig thaum tshav kub kub stabilizers nrog lub teeb zoo dua.
Organotin stabilizers feem ntau yog siv rau kev ntim khoom noj thiab lwm yam khoom siv pob tshab PVC zoo li pob tshab hoses.
Lead Stabilizers:Cov hlau lead stabilizers suav nrog cov hauv qab no: dibasic lead stearate, hydrated tribasic lead sulfate, dibasic lead phthalate, thiab dibasic lead phosphate.
Raws li cov cua sov stabilizers, cov khoom siv lead ua yuav tsis ua rau cov khoom siv hluav taws xob zoo, kev nqus dej tsawg, thiab huab cua sab nraum zoov ntawm cov ntaub ntawv PVC. Txawm li cas los xij,txhuas stabilizersmuaj qhov tsis zoo xws li:
- muaj toxicity;
- Kev sib kis kab mob, tshwj xeeb tshaj yog nrog leej faj;
- Tsim cov tshuaj lead chloride, uas yuav tsim streaks ntawm cov khoom tiav;
- Heavy ratio, ua rau tsis txaus siab qhov hnyav / ntim piv.
- Cov hmoov txhuas txhuas feem ntau ua rau cov khoom siv PVC opaque tam sim ntawd thiab discolor sai sai tom qab kub kub.
Txawm hais tias muaj qhov tsis zoo no, cov hlau lead stabilizers tseem siv dav. Rau hluav taws xob rwb thaiv tsev, txhuas stabilizer yog nyiam. Tau txais txiaj ntsig los ntawm nws cov txiaj ntsig dav dav, ntau yam khoom siv tau yooj yim thiab nruj PVC tau pom zoo xws li cable txheej txheej, opaque PVC nyuaj boards, cov kav dej tawv, tawv tawv, thiab cov tshuaj txhaj tshuaj.
Hlau ntsev stabilizers: Mixed hlau ntsev stabilizersyog aggregates ntawm ntau lub tebchaw, feem ntau yog tsim raws li PVC daim ntawv thov thiab cov neeg siv. Hom stabilizer no tau hloov zuj zus los ntawm qhov sib ntxiv ntawm barium succinate thiab cadmium palm acid ib leeg rau lub cev sib xyaw ntawm barium xab npum, cadmium xab npum, zinc xab npum, thiab organic phosphite, nrog antioxidants, kuab tshuaj, extenders, plasticizers, colorants, UV absorbers, brighteners. , viscosity tswj tus neeg saib xyuas, lubricants, thiab khoom tsw qab. Yog li ntawd, muaj ntau yam uas tuaj yeem cuam tshuam cov nyhuv ntawm qhov kawg stabilizer.
Hlau stabilizers, xws li barium, calcium, thiab magnesium tsis tiv thaiv cov xim thaum ntxov ntawm PVC cov ntaub ntawv tab sis tuaj yeem muab cov cua sov mus ntev. PVC cov khoom ruaj khov nyob rau hauv txoj kev no pib tawm daj / txiv kab ntxwv, ces maj mam tig mus rau xim av, thiab thaum kawg mus rau dub tom qab kub tas li.
Cadmium thiab zinc stabilizers tau siv thawj zaug vim tias lawv yog pob tshab thiab tuaj yeem tuav cov xim qub ntawm cov khoom PVC. Lub sij hawm ntev thermostability muab los ntawm cadmium thiab zinc stabilizers yog qhov phem tshaj qhov uas muaj los ntawm barium sawv daws yuav, uas yuav dheev degrade tag nrho nrog me me los yog tsis muaj kos npe rau.
Ntxiv rau qhov tseem ceeb ntawm cov hlau piv, cov nyhuv ntawm cov hlau ntsev stabilizers kuj muaj feem xyuam rau lawv cov ntsev sib txuas, uas yog cov ntsiab lus tseem ceeb cuam tshuam rau cov khoom nram qab no: lubricity, txav, pob tshab, xim xim hloov, thiab thermal stability ntawm PVC. Hauv qab no yog ob peb hom sib xyaw hlau stabilizers: 2-ethylcaproate, phenolate, benzoate, thiab stearate.
Hlau ntsev stabilizers yog siv dav hauv cov khoom muag PVC thiab pob tshab mos PVC cov khoom xws li cov ntim khoom noj, cov khoom siv kho mob, thiab ntim tshuaj.
Post lub sij hawm: Oct-11-2023