Yuav Ua Li Cas Ntxiv Hydroxyethyl Cellulose rau Coatings?

Hydroxyethyl cellulose (HEC) yog ib hom thickener thiab rheology modifier uas yog siv nyob rau hauv ntau yam txheej txheej formulations, nrog rau cov xim, nplaum, thiab sealants. Thaum ntxiv HEC rau cov txheej txheej, nws yog ib qho tseem ceeb uas yuav tsum tau ua raws li ob peb kauj ruam tseem ceeb kom ntseeg tau tias nws tau tawg thiab hydrated kom zoo. Nov yog cov kauj ruam dav dav ntxiv HEC rau cov txheej txheem:

1. Npaj HEC dispersion HEC feem ntau yog muab los ua cov hmoov qhuav uas yuav tsum tau muab pov tseg hauv dej ua ntej nws tuaj yeem muab ntxiv rau txheej. Txhawm rau npaj HEC dispersion, ntxiv qhov xav tau ntawm HEC hmoov rau dej thaum nplawm tas li. Qhov pom zoo concentration ntawm HEC nyob rau hauv lub dispersion nyob ntawm qhov kev thov tshwj xeeb thiab xav tau viscosity ntawm txheej.
2. Sib tov HEC dispersion nrog cov txheej Thaum HEC dispersion yog tag nrho hydrated thiab HEC hais tag nrho dispersed, maj mam ntxiv nws rau txheej thaum sib tov tsis tu ncua. Nws yog ib qho tseem ceeb uas yuav tau ntxiv HEC dispersion maj mam los tiv thaiv clumping thiab xyuas kom meej tias nws yog sib npaug zos thoob plaws txheej txheej. Kev sib tov ceev yuav tsum tau khaws cia ntawm ib qho me me kom tiv thaiv kom tsis txhob muaj huab cua ntau dhau.
3. Kho cov pH ntawm txheej HEC yog rhiab rau pH thiab ua haujlwm zoo tshaj plaws ntawm pH ntau ntawm 6-8. Yog li ntawd, nws yog ib qho tseem ceeb uas yuav tau kho cov pH ntawm txheej rau qhov no ua ntej ntxiv HEC dispersion. Qhov no tuaj yeem ua tau los ntawm kev ntxiv me me ntawm pH kho tus neeg sawv cev, xws li ammonia lossis sodium hydroxide, rau txheej thaum saib xyuas pH.
4. Cia lub txheej kom so thiab paub tab Tom qab ntxiv HEC dispersion rau txheej, nws raug nquahu kom tso cov khoom sib tov kom so li 30 feeb kom tso cai rau HEC kom tag nrho hydrate thiab thicken lub txheej. Nws yog ib qho tseem ceeb uas yuav tsum tau do cov sib tov ib ntus thaum lub sij hawm no los tiv thaiv kev daws teeb meem thiab xyuas kom meej tias HEC raug faib sib npaug. Cov txheej yuav tsum tau tso cai rau kom loj hlob tsawg kawg yog 24 teev ua ntej siv los xyuas kom meej tias HEC tau ua tiav cov txheej txheej.

Zuag qhia tag nrho, ntxiv HEC rau cov txheej txheej suav nrog kev npaj HEC dispersion, maj mam ntxiv rau cov txheej thaum sib xyaw tsis tu ncua, kho cov pH ntawm txheej, thiab tso cai rau cov sib tov kom so thiab paub tab ua ntej siv. Ua raws li cov kauj ruam no tuaj yeem pab xyuas kom meej tias HEC tau tawg tag nrho thiab hydrated, ua rau cov txheej txheej zoo nrog cov khoom siv rheological xav tau.