Txoj Kev Txiav Txim Siab, Txee Lub Neej thiab Ntim Kev daws rau Industrial PVA

Muaj Polyvinyl Alcohol (PVA) yuav tsum muaj cov txheej txheem sib cais kom raug, cov xwm txheej khaws cia, thiab ntim cov kev daws teeb meem los tswj nws cov kev ua tau zoo, ua kom ntev txee lub neej, thiab xyuas kom yooj yim ntawm kev siv. Rau cov neeg siv khoom lag luam, cov khoom siv tshuaj, thiab cov neeg xa tawm, kev nkag siab txog cov ntsiab lus no yog qhov tseem ceeb rau kev siv PVA kom zoo, txo cov khoom pov tseg, thiab ua kom cov khoom ruaj khov thaum khaws cia thiab kev thauj mus los.

 

Txoj kev tawg rau PVA txawv nyob ntawm qib (tag nrho hydrolyzed vs ib nrab hydrolyzed). Ib nrab hydrolyzed PVA (87-89% hydrolysis) yog soluble hauv dej txias (chav sov), ua kom yooj yim rau yaj: tsuas yog ntxiv PVA hmoov rau hauv dej thaum nplawm tas li kom tsis txhob clumping, thiab do kom txog thaum tag nrho yaj (feem ntau 10-20 feeb). Siab hydrolyzed PVA (98-99% hydrolysis) yog insoluble nyob rau hauv dej txias thiab yuav tsum tau dej kub (80-90 degree) rau dissolution: dej kub rau qhov yuav tsum tau kub, ntxiv PVA hmoov maj mam stirring, thiab ntxiv stirring kom txog thaum tag nrho yaj (feem ntau 30-40 feeb).

 

Txhawm rau kom ua tiav tiav thiab tsis txhob sib cais, nws raug nquahu kom ua ntej - sib tov PVA hmoov nrog ib qho me me ntawm cov tsis yog - ionic surfactant (xws li ethanol) ua ntej ntxiv rau dej. Qhov no pab disperse PVA hais thiab ceev cov txheej txheem dissolution. Tsis tas li ntawd, stirring ceev yuav tsum tau tswj kom tsis txhob muaj cua npuas, uas tuaj yeem cuam tshuam kev ua haujlwm ntawm PVA- raws li cov khoom xws li cov nplaum thiab cov yeeb yaj kiab.

 

Lub neej txee ntawm PVA nyob ntawm qhov chaw cia khoom. Thaum khaws cia rau hauv qhov txias, qhuav, zoo- qhov chaw cua, kom deb ntawm cov dej noo, cua sov, thiab tshav ntuj ncaj qha, PVA khoom (flakes lossis hmoov) muaj lub neej txee ntawm 12-24 lub hlis. Thaum yaj, PVA cov kev daws teeb meem muaj lub neej txee luv dua (7-14 hnub nyob rau hauv chav tsev kub) thiab yuav tsum muab cia rau hauv cov thawv kaw kom tsis txhob muaj kab mob thiab evaporation. Ntxiv me me ntawm cov tshuaj khaws cia (xws li sodium benzoate) tuaj yeem txuas ntxiv lub neej txee ntawm PVA daws rau 30-60 hnub.

 

Ntim cov kev daws teeb meem rau kev lag luam PVA yog tsim los tiv thaiv kev nqus dej noo, kev sib kis, thiab kev puas tsuaj thaum khaws cia thiab kev thauj mus los. Cov kev xaiv ntim khoom muaj xws li 25kg woven hnab lined nrog cov hnab yas sab hauv (rau hmoov los yog flakes), 200kg steel nruas (rau siab -purity PVA), thiab tej hnab ntim loj (rau loj - loj xaj). Lub ntim yuav tsum tau muab kaw kom nruj nrog cov dej noo- daim kab xev pov thawj, thiab sau nrog cov ntaub ntawv meej meej, suav nrog qib, qib ntawm hydrolysis, qhov hnyav molecular, qhov hnyav, thiab cov lus qhia khaws cia.

 

Rau kev xa khoom xa tawm, PVA yuav tsum tau ntim rau hauv cov dej noo- cov thawv pov thawj los tiv thaiv kev puas tsuaj los ntawm dej hiav txwv. Nws tsis raug cais raws li cov khoom siv phom sij, yog li nws tsis tas yuav ntim cov khoom txaus ntshai tshwj xeeb, tab sis nws yuav tsum tau muab cais tawm ntawm cov dej noo- cov ntaub ntawv rhiab heev. Cov ntaub ntawv suav nrog Daim Ntawv Pov Thawj Kev Ntsuam Xyuas (CoA), daim ntawv them nqi lag luam, thiab cov npe ntim khoom.

 

Los ntawm kev ua raws li txoj kev sib cais kom raug, cov xwm txheej khaws cia, thiab cov kev daws teeb meem, cov neeg siv khoom tuaj yeem ua kom tiav qhov kev ua tau zoo thiab txee lub neej ntawmPolyvinyl cawv (PVA), txo cov khoom pov tseg thiab ua kom muaj txiaj ntsig zoo ib yam. Rau cov neeg xa khoom, siab - ntim zoo ua kom cov khoom ruaj khov thaum lub sijhawm thauj mus los, pab tsim kev ntseeg siab nrog cov neeg yuav khoom thoob ntiaj teb.