Cov khoom siv PVC Stabilizer yog dab tsi?

Cov khoom siv PVC stabilizeryog cov khoom siv ntxiv uas siv los txhim kho qhov ruaj khov ntawm polyvinyl chloride (PVC) thiab nws cov copolymers. Rau PVC yas, yog tias qhov kub ua tiav tshaj 160 ℃, kev rhuav tshem thermal yuav tshwm sim thiab HCl roj yuav tsim tawm. Yog tias tsis raug tswj hwm, qhov kev rhuav tshem thermal no yuav hnyav dua, cuam tshuam rau kev txhim kho thiab kev siv PVC yas.

Cov kev tshawb fawb pom tau tias yog tias cov yas PVC muaj me ntsis ntsev txhuas, xab npum hlau, phenol, aromatic amine, thiab lwm yam tsis huv, nws cov txheej txheem thiab kev siv yuav tsis raug cuam tshuam, txawm li cas los xij, nws cov thermal decomposition tuaj yeem raug txo kom tsawg rau qee qhov. Cov kev tshawb fawb no txhawb nqa kev tsim thiab kev txhim kho tas mus li ntawm PVC stabilizers.

Cov tshuaj stabilizer PVC feem ntau muaj xws li organotin stabilizers, cov tshuaj ntsev hlau stabilizers, thiab cov tshuaj inorganic salt stabilizers. Organotin stabilizers siv dav hauv kev tsim cov khoom PVC vim lawv cov pob tshab, tiv taus huab cua zoo, thiab sib xws. Cov tshuaj ntsev hlau stabilizers feem ntau siv calcium, zinc, lossis barium ntsev, uas tuaj yeem muab kev ruaj khov thermal zoo dua. Cov tshuaj inorganic salt stabilizers xws li tribasic lead sulfate, dibasic lead phosphite, thiab lwm yam muaj kev ruaj khov ntev thiab rwb thaiv hluav taws xob zoo. Thaum xaiv cov tshuaj PVC stabilizer tsim nyog, koj yuav tsum xav txog cov xwm txheej ntawm daim ntawv thov ntawm cov khoom PVC thiab cov khoom ruaj khov uas xav tau. Cov tshuaj stabilizers sib txawv yuav cuam tshuam rau kev ua haujlwm ntawm cov khoom PVC lub cev thiab tshuaj lom neeg, yog li yuav tsum muaj kev tsim thiab kev sim nruj kom ntseeg tau tias cov tshuaj stabilizers tsim nyog. Cov lus qhia ntxaws thiab kev sib piv ntawm ntau yam PVC stabilizers yog raws li nram no:

Organotin Stabilizer:Cov tshuaj Organotin stabilizers yog cov tshuaj stabilizers zoo tshaj plaws rau cov khoom PVC. Lawv cov tshuaj yog cov khoom ua rau muaj kev sib xyaw ntawm organotin oxides lossis organotin chlorides nrog cov kua qaub lossis esters tsim nyog.

Cov tshuaj stabilizers Organotin muab faib ua cov uas muaj sulfur thiab cov uas tsis muaj sulfur. Cov tshuaj stabilizers uas muaj sulfur zoo heev, tab sis muaj teeb meem hauv kev saj thiab kev pleev xim zoo ib yam li lwm cov tshuaj uas muaj sulfur. Cov tshuaj stabilizers uas tsis muaj sulfur feem ntau yog ua los ntawm maleic acid lossis ib nrab maleic acid esters. Lawv nyiammethyl tin stabilizerstsis tshua muaj txiaj ntsigcov tshuaj stabilizer kubnrog lub teeb zoo dua qub.

Cov tshuaj stabilizers Organotin feem ntau yog siv rau cov khoom ntim khoom noj thiab lwm yam khoom siv PVC pob tshab xws li cov kav dej pob tshab.

Cov khoom siv lead stabilizer:Cov tshuaj stabilizers ib txwm muaj xws li cov tshuaj hauv qab no: dibasic lead stearate, hydrated tribasic lead sulfate, dibasic lead phthalate, thiab dibasic lead phosphate.

Ua cov khoom siv tiv thaiv cua sov, cov tshuaj txhuas yuav tsis ua puas rau cov khoom siv hluav taws xob zoo heev, kev nqus dej tsawg, thiab kev tiv thaiv huab cua sab nraum zoov ntawm cov ntaub ntawv PVC. Txawm li cas los xij,cov tshuaj stabilizersmuaj cov kev tsis zoo xws li:

- muaj mob toxicity;

- Kev sib kis kab mob, tshwj xeeb tshaj yog nrog cov leej faj;

- Tsim cov tshuaj lead chloride, uas yuav tsim cov kab txaij ntawm cov khoom tiav lawm;

- Qhov sib piv hnyav, ua rau qhov sib piv ntawm qhov hnyav/ntim tsis txaus siab.

- Cov tshuaj stabilizers feem ntau ua rau cov khoom PVC tsis pom tseeb tam sim ntawd thiab ploj xim sai sai tom qab cua sov tas mus li.

Txawm hais tias muaj cov teeb meem no los xij, cov tshuaj txhuas ruaj khov tseem siv dav. Rau kev rwb thaiv hluav taws xob, cov tshuaj txhuas ruaj khov yog qhov zoo dua. Tau txais txiaj ntsig los ntawm nws cov txiaj ntsig dav dav, ntau yam khoom PVC uas yoog tau thiab tawv tau pom xws li cov txheej sab nraud ntawm cable, cov laug cam PVC tawv tsis pom kev, cov kav dej tawv, tawv cuav, thiab cov tshuaj txhaj.

Cov tshuaj ruaj khov ntsev hlau: Cov khoom sib xyaw ua ke ntawm cov ntsev hlauyog cov khoom sib xyaw ua ke ntawm ntau yam sib xyaw, feem ntau tsim raws li cov ntawv thov PVC thiab cov neeg siv tshwj xeeb. Hom stabilizer no tau hloov zuj zus los ntawm kev ntxiv barium succinate thiab cadmium palm acid ib leeg rau kev sib xyaw lub cev ntawm barium xab npum, cadmium xab npum, zinc xab npum, thiab organic phosphite, nrog rau cov tshuaj antioxidants, cov kuab tshuaj, cov khoom siv extenders, plasticizers, cov xim, UV absorbers, brighteners, viscosity control agents, lubricants, thiab cov tsw qab dag. Yog li ntawd, muaj ntau yam uas tuaj yeem cuam tshuam rau qhov cuam tshuam ntawm qhov kawg stabilizer.

Cov tshuaj ruaj khov hlau, xws li barium, calcium, thiab magnesium tsis tiv thaiv cov xim thaum ntxov ntawm cov khoom siv PVC tab sis tuaj yeem tiv taus cua sov mus ntev. Cov khoom siv PVC ruaj khov hauv txoj kev no pib tawm daj / txiv kab ntxwv, tom qab ntawd maj mam hloov mus rau xim av, thiab thaum kawg mus rau dub tom qab cua sov tas li.

Cov tshuaj cadmium thiab zinc stabilizers tau siv thawj zaug vim tias lawv pob tshab thiab tuaj yeem khaws cov xim qub ntawm cov khoom PVC. Qhov kev ruaj khov ntev uas muab los ntawm cadmium thiab zinc stabilizers yog qhov phem dua li qhov muab los ntawm barium, uas feem ntau poob qis tag nrho yam tsis muaj cim lossis tsis muaj cim.

Ntxiv rau qhov sib piv ntawm cov hlau, cov nyhuv ntawm cov hlau ntsev stabilizers kuj muaj feem cuam tshuam nrog lawv cov ntsev sib xyaw, uas yog cov yam tseem ceeb uas cuam tshuam rau cov khoom hauv qab no: lubricity, kev txav mus los, pob tshab, xim hloov pauv, thiab thermal stability ntawm PVC. Hauv qab no yog ntau cov hlau sib xyaw stabilizers: 2-ethylcaproate, phenolate, benzoate, thiab stearate.

Cov tshuaj stabilizers hlau yog siv dav hauv cov khoom PVC mos thiab cov khoom PVC pob tshab zoo li cov ntim khoom noj, cov khoom siv kho mob, thiab cov ntim tshuaj.