Cov khoom sib xyaw ua ke calcium zinc stabilizers feem ntau yog ua los ntawm stearic acid xab npum, ua raws li lauric acid xab npum thiab oleic acid xab npum. Cov khoom no muaj lubricity zoo thiab tsis txo qhov softening ntawm PVC cov khoom tawv, ua rau nws tsim nyog rau kev ua cov kav dej PVC tawv thiab cov profile.
Cov khoom lag luam uas ua tiav los ntawm kev siv tshuab microemulsification kov yeej cov teeb meem uas tau hais los saum toj no. Tib neeg tsom mus rau ob yam rau kev txhim kho: txhawm rau txhim kho xim pib, ntxiv cov xab npum zinc txaus, thiab cov neeg sawv cev chelating siv los ua kom zinc chloride tsis muaj teeb meem. Qhov no hu ua kev sib koom tes zinc siab: txo cov xab npum zinc ntxiv los tiv thaiv kev hlawv zinc, thiab siv cov khoom ntxiv los hloov xim pib. Txoj kev no hu ua kev sib koom tes zinc qis. Tsis yog tsuas yog siv dav hauv cov khoom mos xwb, nws cov txiaj ntsig thermal stability thiab pob tshab tau lees paub, tab sis kuj tau siv tau zoo hauv kev ua cov khoom tawv. Txhawm rau kom tswj tau xim pib tsawg kawg nkaus thiab tiv thaiv kev hlawv zinc hauv lub cev calcium / zinc.
Feem ntau, cov ntsev txhuas tsuas yog lo rau ntawm qhov chaw ntawm cov khoom PVC, uas ua rau muaj kev cuam tshuam rau kev sib xyaw ntawm cov khoom PVC, ua rau qeeb qeeb ntawm kev ua yas, txo kev sib txhuam ntawm cov khoom PVC, thiab txo qhov shear hauv PVC. Cov khoom siv ua tiav tuaj yeem tiv taus cov khoom thauj tsawg dua. Siv ntsev txhuas ntau npaum li cas, cov khoom me me ntawm ntsev txhuas yuav me dua, thiab qhov cuam tshuam yuav pom tseeb dua.
Cov khoom lag luam ib puag ncig ib txwm muaj xws li calcium zinc stabilizers, vim lawv cov electronegativity siab, muaj qee qhov kev sib raug zoo ntawm cov pab pawg polar thiab cov nodes ntawm PVC resin thaum lub sijhawm plasticization, tsim cov khoom sib txuas muaj zog, yog li ua rau tsis muaj zog lossis tshem tawm qhov kev nyiam ntawm cov ion bonds hauv ntau txheej ntawm PVC. Qhov no ua rau cov saw hlau ntawm PVC uas sib txuas ua ke yooj yim rau diffuse, thiab cov ciam teb ntawm cov pab pawg molecular yooj yim rau nqaim, txhawb kev plasticization ntawm PVC resin. Qhov no ua rau muaj kev nce sai ntawm lub siab yaj, txo qis hauv viscosity yaj, nce kub, thiab txo qis hauv qhov kub plasticizing tom qab cov resin yog ib feem plasticized hauv seem pub mis. Resin hloov pauv plasticization tau tshwm sim dua.
Vim tias cov khoom siv ua PVC ib txwm muaj yog tsim los rau kev ua nrog cov tshuaj ua kom cov ntsev ua kom ruaj khov, txawm tias ntxiv cov roj nplua nyeem txaus los tsis tuaj yeem tiv thaiv kev ua kom cov roj nplaum ntxiv rau lub sijhawm txaus, thiab tseem cuam tshuam qhov sib npaug ntawm cov roj nplua nyeem qub. Kev siv PVC yaj hauv theem homogenization siv ntau cov tshuaj ua kom sov, tab sis tsis tuaj yeem ua tiav qhov viscosity thiab elasticity zoo tagnrho kom tau raws li qhov xav tau ntawm PVC tawv. Qhov no yog qhov teeb meem uas calcium zinc stabilizers yuav tsum daws hauv kev hloov cov ntsev ua kom ruaj khov.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-20-2024
