HEC (Hydroxyethyl cellulose) yog cov dej tsis-ionic-soluble polymer dav siv cov khoom siv ua hauv tsev, cov khoom lag luam hauv tsev, kws tshuaj thiab lwm yam lag luam. Nws yog tsuas yog siv los ua cov tuab dua, cov neeg sawv cev tsis raug, binder thiab ua yeeb yaj kiab-ua yeeb yaj kiab zoo thiab thickening muaj peev xwm.
1. Xaiv thiab Kev Npaj ntawm Hec
Xaiv lub Hec cov khoom yog yog thawj kauj ruam hauv kev siv. HEC muaj qhov hnyav sib txawv, solubility thiab thickening muaj peev xwm tseem yuav txawv. Yog li ntawd, txoj cai hec muaj ntau yam yuav tsum tau xaiv raws li cov kev cai thov kom paub. Piv txwv li, thaum siv cov tsho tiv no, hac nrog cov viscirecosity yuav tsum tau xaiv; Thaum nyob rau hauv cov khoom lag luam saib xyuas tus kheej, HEC nrog cov dej noo ntau dua thiab biocompatibility yuav tau xaiv.
Ua ntej siv, hec feem ntau muaj nyob hauv daim hmoov hmoov, thiab kev saib xyuas yuav tsum tau coj mus rau kev tiv thaiv kev nqus dej noo thiab agglomeration thaum siv. HEC tuaj yeem khaws cia rau hauv ib qho chaw muaj pa kom qhuav, kom tsis txhob muaj huab cua ntub.
2. Cov txheej txheem ntawm Hec
HEC yog dej-soluble polymer uas tuaj yeem ua ncaj qha rau hauv dej txias lossis dej kub. Ntawm no yog cov kauj ruam dav dav rau kev ua tiav HEC:
Dispersing Hec: Maj mam ntxiv hec hmoov rau cov dej ntws kom tsis txhob hmoov agglomeration. Txhawm rau tiv thaiv HEC los ntawm condensing ntawm cov dej saum npoo av, dej tuaj yeem ua kom sov rau 60-70 ℃ ua ntej maj mam nchuav cov hmoov dej.
Cov txheej txheem tshem tawm: Hec tau tawg maj mam hauv dej thiab feem ntau yuav tsum tau siv txoj hlab rau 30 feeb, nyob ntawm qhov viscosity thiab hnyav hnyav ntawm HEC. Thaum lub sij hawm cov txheej txheem stirring, dej kub yuav tau nce ntxiv kom nrawm dua kev sib cais, tab sis feem ntau tsis ntau tshaj li 90 ℃.
Kho PH: HEC yog rhiab rau kev hloov pauv hauv Ph. Hauv qee cov ntawv thov, yuav xav tau kho kom haum rau ib qho kev (feem ntau 6-8) kom ua tiav cov nyhuv zoo tshaj plaws thiab kev ruaj khov.
Sawv thiab ua kom tiav: Cov tshuaj hec uas yaj feem ntau yuav tsum tau sawv ntsug rau ob peb teev mus rau yav hmo ntuj kom paub tab. Qhov no pab txhim kho qhov viscosity stability ntawm kev daws teeb meem thiab ua kom muaj kev sib xws ntawm cov nyhuv tuab.
3. Daim Ntawv Thov Ntawm Hec
Cov nyhuv tuab ntawm HEC tau dav siv hauv ntau yam khoom. Cov hauv qab no yog ntau cov ntawv thov raug cai thiab lawv cov kev pab tshwj xeeb:
Daim Ntawv Thov Ua Tsho:
HEC, raws li cov tuab rau cov txheej txheej, tuaj yeem txhim kho kom muaj kev yooj yim thiab kev khuam ntawm cov txheej txheej thiab tiv thaiv cov txheej txheej ntawm sagging.
Thaum siv, ntxiv cov tshuaj hec ncaj qha rau txheej thiab do tusyees. Ua tib zoo saib cov nyiaj ntawm Hec ntxiv, feem ntau 0.1% rau 0.5% ntawm tag nrho cov nyiaj.
Txhawm rau zam lub viscosity ntawm txheej txo qis qis qis dua siab, xaiv HEC nrog haum molecular hnyav thiab viscosity.
Daim ntawv thov hauv cov khoom saib xyuas tus kheej:
Hauv cov khoom lag luam xws li zawv plaub hau thiab da dej gel, HEC tuaj yeem siv los ua cov tuab thiab stabilizer kom muab cov khoom kov zoo thiab cov nyhuv zoo.
Thaum siv, HEC tuaj yeem yaj nyob rau theem dej ntawm cov khoom lag luam, thiab xyuam xim rau nplawm tusyees kom zam dhau kev tsim cov kev sib cais.
Tus nqi tsim nyog ntawm kev ntxiv yog feem ntau ntawm 0.5% thiab 2%, thiab raug hloov kho raws li qhov xav tau cov nyhuv thickening.
Daim ntawv thov hauv cov ntaub ntawv hauv tsev:
HEC muaj feem ntau siv hauv tshuaj khib, gypsum, thiab lwm yam hauv cov ntaub ntawv hauv tsev, uas tuaj yeem txhim kho cov dej ua haujlwm thiab ua haujlwm ntawm cov khoom.
Thaum siv, HEC tuaj yeem yaj nyob hauv dej ua ntej, thiab tom qab ntawd cov kev daws teeb meem ntxiv rau kev sib tov ntawm cov ntaub ntawv tsim tsev.
Tus nqi ntawm kev ntxiv nyob ntawm cov khoom siv tshwj xeeb, feem ntau ntawm 0.1% thiab 0.3%.
4. Kev ceev faj rau kev siv
Kev tswj qhov kub thiab txias thaum lub sij hawm ua kom sov: Txawm hais tias nce qhov kub ntawm Hec, kev kub dhau heev yuav ua rau muaj qhov kub thiab txias ntau dhau.
Stirring nrawm thiab lub sijhawm ua nrawm nrawm yuav ua rau cov teeb meem ua kom zoo nkauj thiab cuam tshuam qhov zoo ntawm cov khoom kawg. Txiav txim siab siv tus degasser kom tshem tawm cov npuas ntawm kev daws.
Compatibility nrog lwm cov khoom xyaw: thaum ntxiv Hec rau tus qauv, them nyiaj rau nws cov khoom xyaw nrog lwm cov khoom xyaw. Qee cov khoom xyaw yuav cuam tshuam rau cov nyhuv tuab lossis solubility ntawm HEC, xws li cov siab ntawm electrolytes.
Cia thiab ruaj khov: HEC kev daws teeb meem yuav tsum tau siv kom sai li sai tau, vim tias lub sij hawm ntev yuav cuam tshuam rau viscosity thiab ruaj khov ntawm kev daws.
Hec thickener tau siv dav hauv ntau thaj teb nrog nws cov kev ua tau zoo. Qhov tseeb siv cov qauv thiab cov txheej txheem kev ua haujlwm tuaj yeem ua kom ntseeg tau tias HEC ua tau zoo tshaj plaws. Thaum siv, them nyiaj rau yam xws li txoj kev sib cais, kev tswj kom sov, thiab sib ntxiv nrog cov khoom xyaw tuaj yeem ua tiav cov kev xav tau cov nyhuv tuab thiab ua haujlwm.
Lub Sijhawm Post: Feb-17-2025