Qhov sib txawv tseem ceeb ntawm PVA thiab PVC yog qhov ua haujlwm ntawm cov khoom siv PVA yog ib pawg cawv, qhov chaw ua haujlwm ntawm cov khoom siv PVC yog pawg halide.
Lub sij hawm PVA stands rau polyvinyl cawv polymer khoom thaum lub sij hawm PVC stands rau polyvinyl chloride polymer khoom. Cov ntaub ntawv no muaj ntau qhov rov ua dua tshiab uas muaj pab pawg ua haujlwm uas muab cov polymers lawv cov khoom tshwj xeeb.
YPVA yog dab tsi?
PVA yog polyvinyl cawv. Nws yog dej-soluble hluavtaws polymer khoom. Cov khoom no muaj txiaj ntsig zoo hauv papermaking, textile wrap sizing, raws li tus neeg sawv cev thickening, thiab ua emulsion stabilizer. Muaj ntau ntau lwm lub npe rau cov khoom no, suav nrog Vinol, Alvyl, Mowiol, Lemol, Alcotex, thiab Elvanol.
Peb tuaj yeem soj ntsuam cov khoom siv PVA ua cov khoom siv polymer atactic uas nthuav tawm cov xwm txheej crystalline. Hauv nws cov microstructure, cov khoom siv yog tsim los ntawm 1, 3-diol linkages thiab ob peb feem pua ntawm 1, 2-diol linkages. Qhov tshwm sim ntawm cov kev sib txuas no nyob ntawm cov xwm txheej peb siv rau cov txheej txheem polymerization ntawm cov yas ester precursor.
Daim duab 01: General Formula ntawm PVA Polymer
Ntxiv mus, cov khoom siv no muaj cov cuab yeej ua yeeb yaj kiab zoo, emulsifying zog, thiab cov khoom nplaum. Ntxiv rau qhov no, cov khoom siv no tiv taus cov roj, roj, thiab cov kuab tshuaj. Tsis tas li ntawd, PVA muaj lub zog tensile siab, thiab yoog raws, uas yog cov khoom nyob ntawm cov av noo. Yog tias cov av noo siab, ces cov polymer lub zog tensile txo, tab sis lub elongation thiab kua muag zog nce.
YPVC yog dab tsi?
PVC yog ib qho polymer uas muaj polyvinyl chloride. Nws yog ib qho thermoplastic polymer ua los ntawm chloroethene monomers. PVC yog ib hom polymer ntau heev. Muaj ob pawg ntawm PVC raws li daim ntawv nruj thiab daim ntawv hloov tau. Cov khoom siv PVC nruj yog qhov tseem ceeb hauv kev tsim kho kev xav tau, qhov hloov pauv PVC daim ntawv yog siv rau kev xaim thiab cables.
Daim duab 02: General Formula ntawm PVC Polymer
Muaj peb kauj ruam tseem ceeb hauv kev tsim cov PVC. Thawj kauj ruam suav nrog kev hloov pauv ntawm ethane rau hauv 1, 2-dichloroethane. Cov kauj ruam no yog ua los ntawm chlorination. Cov kauj ruam thib ob ntawm PVC ntau lawm yog tawg ntawm 1, 2-dichloroethane rau hauv chloroethene, nrog rau kev tshem tawm ntawm HCl molecule. Qhov thib peb thiab kawg kauj ruam ntawm PVC ntau lawm yog cov txheej txheem polymerization ntawm chloroethene thiaj li yuav tsim PVC ntawm dawb radical polymerization txheej txheem.
PVC muaj ntau yam khoom tseem ceeb, suav nrog kev ua haujlwm siab thiab cov khoom siv zoo, tsis muaj cua sov ruaj khov, nplaim hluav taws xob zoo, hluav taws xob rwb thaiv tsev siab, thiab tshuaj lom neeg. Ntxiv mus, muaj ntau yam txiaj ntsig rau kev siv PVC. Piv txwv li, nws tau yooj yim muaj nyob rau hauv kev ua lag luam, thiab nws yog cov khoom pheej yig nrog lub zog tensile zoo. Tsis tas li ntawd, cov khoom no tseem tiv taus cov tshuaj xws li acids thiab bases.
Qhov txawv ntawm PVA thiab PVC yog dab tsi?
Lub sij hawm PVA sawv cev rau cov khoom siv polyvinyl cawv polymer thaum lub sij hawm PVC sawv cev rau cov khoom siv polyvinyl chloride polymer. Qhov sib txawv tseem ceeb ntawm PVA thiab PVC yog qhov ua haujlwm ntawm cov khoom siv PVA yog ib pawg cawv, thaum pawg ua haujlwm ntawm PVC khoom yog ib pawg halide. Ntxiv mus, PVA yog siv nyob rau hauv papermaking, textile qhwv sizing, raws li ib tug thickening neeg sawv cev, thiab raws li ib tug emulsion stabilizer, thaum PVC yog siv nyob rau hauv lub tsim ntawm cov kav dej, hluav taws xob cables, kev tsim kho xav tau kev pab, khaub ncaws, flooring, hlau hlua ntau lawm, thiab lwm yam.
Cov ntaub ntawv hauv qab no-daim duab qhia txog qhov sib txawv ntawm PVA thiab PVC hauv daim ntawv.
Summary – PVA vs PVC
Lub sij hawm PVA stands rau polyvinyl cawv polymer khoom thaum lub sij hawm PVC stands rau polyvinyl chloride polymer khoom. Qhov sib txawv tseem ceeb ntawm PVA thiab PVC yog cov pab pawg ua haujlwm ntawm PVA cov khoom yog ib pawg cawv, qhov chaw ua haujlwm ntawm cov khoom siv PVC yog pawg halide.
