Self-leveling compounds (SLC) yog ceev-qhuav thiab ntau yam khoom siv hauv pem teb uas tau nrov zuj zus vim lawv qhov tshwj xeeb ruaj khov thiab du nto. Lawv tau siv dav hauv kev siv vaj tse thiab kev lag luam mus rau qib pob zeb ua ntej tso cov ntaub pua plag, yas, ntoo lossis pobzeb pem teb. Txawm li cas los xij, kev ua haujlwm ntawm SLCs tuaj yeem cuam tshuam los ntawm ntau yam ib puag ncig xws li kub, av noo, thiab substrate adhesion. Txhawm rau txhim kho kev ua haujlwm ntawm tus kheej-leveling compounds, manufacturers tau pib ntxiv hydroxypropylmethylcellulose (HPMC) thiab hydroxyethylmethylcellulose (HEMC) ua cov thickeners.
HPMC yog cov dej-soluble polymer uas tsim cov gel ruaj khov thaum tawg hauv dej. Nws yog feem ntau siv nyob rau hauv architectural daim ntaub ntawv vim nws zoo heev dej tuav thiab nplaum zog. Thaum ntxiv rau tus kheej-leveling compounds, HPMC txhim kho cov dej ntws thiab kev ua haujlwm ntawm kev sib tov. Nws kuj tseem txo cov dej uas xav tau kom ua tiav qhov kev xav tau sib xws, tiv thaiv kev shrinkage thiab tawg thaum kho. Tsis tas li ntawd, HPMC tuaj yeem ua kom lub zog sib txuas ntawm SLC, yog li txhim kho nws qhov hnav tsis kam.
HEMC yog lwm cov dej-soluble polymer dav siv hauv kev tsim kho kev lag luam ua cov thickener thiab rheology tswj tus neeg saib xyuas. Nws tuaj yeem txhim kho qhov adhesion, cohesion thiab sib xws ntawm cov khoom siv hauv tsev, ua rau nws nrov additive hauv SLC. Thaum ntxiv rau SLC, HEMC tsub kom cov viscosity ntawm cov sib tov, cia nws kis tau tusyees ntau thiab ua raws li zoo dua rau cov substrate. Nws kuj tseem txhim kho tus kheej-leveling cov khoom ntawm cov khoom sib txuas, txo qhov muaj peev xwm ntawm qhov tsis xws luag xws li pinholes thiab cua npuas. Tsis tas li ntawd, HEMC nce lub zog tag nrho ntawm SLC, ua rau nws ruaj khov thiab tsis tshua muaj kev puas tsuaj.
Ib qho txiaj ntsig tseem ceeb ntawm kev siv HPMC thiab HEMC hauv kev sib xyaw ua ke ntawm tus kheej yog tias lawv txhim kho kev ua haujlwm ntawm kev sib tov. Qhov no txhais tau hais tias cov neeg cog lus tuaj yeem nchuav thiab kis tau SLC yooj yim dua, txo cov nqi zog uas xav tau rau txoj haujlwm. Tsis tas li ntawd, ntxiv HPMC thiab HEMC rau SLC pab txo lub sijhawm ziab ntawm qhov sib tov. Qhov no yog vim lawv tiv thaiv cov dej hauv qhov sib tov los ntawm evaporating, uas ua rau muaj kev sib tw ntau dua thiab zoo ib yam.
Lwm qhov txiaj ntsig ntawm kev siv HPMC thiab HEMC nyob rau hauv tus kheej-leveling tebchaw yog tias lawv txhim kho tag nrho cov zoo hauv pem teb tiav. Thaum ntxiv rau qhov sib tov, cov polymers no txhim kho qhov adhesion ntawm SLC rau hauv cov substrate, txo qhov kev pheej hmoo ntawm daim ntawv cog lus tsis ua haujlwm. Qhov no ua kom ntseeg tau tias hauv pem teb yuav kav ntev dua thiab nyob twj ywm tsis muaj zog txawm tias muaj tsheb khiav hnyav. Tsis tas li ntawd, kev siv HPMC thiab HEMC tsim ib qho smoother, leveler nto uas ua rau nws yooj yim rau nteg lwm cov ntaub ntawv hauv pem teb rau saum.
Nyob rau hauv cov nqe lus ntawm tus nqi, ntxiv HPMC thiab HEMC rau tus kheej-leveling tebchaw yog pheej yig. Cov polymers no tau yooj yim muaj nyob rau hauv kev ua lag luam thiab tuaj yeem yooj yim muab tso rau hauv SLC blends thaum tsim khoom. Feem ntau, tsuas yog qee qhov me me ntawm HPMC thiab HEMC xav tau kom ua tiav qhov sib xws thiab kev ua tau zoo uas yuav tsum tau ua rau SLC, uas pab ua kom cov nqi tsim khoom qis.
Qhov kawg tab sis tsis kawg, kev siv HPMC thiab HEMC nyob rau hauv tus kheej-leveling tebchaw yog ib qho kev daws teeb meem rau ib puag ncig. Cov polymers no yog biodegradable thiab tsis muaj cov khoom phom sij, txhais tau tias lawv tsis muaj kev phom sij rau tib neeg kev noj qab haus huv lossis ib puag ncig. Lawv siv hauv SLC pab txhawb kev ruaj khov hauv kev tsim kho kev lag luam, qhov tseem ceeb hauv ntiaj teb niaj hnub no.
Ntxiv HPMC thiab HEMC rau tus kheej-leveling tebchaw muaj ntau yam zoo, ua rau nws yog ib qho zoo tagnrho tov rau cov neeg cog lus thiab manufacturers. Cov polymers no txhim kho cov txheej txheem ntawm kev sib tov, txo lub sij hawm ziab, txhim kho qhov zoo ntawm cov av tiav, ua kom cov nqi qis thiab txhawb kev ruaj ntseg. Raws li kev tsim kho kev lag luam txuas ntxiv mus nrhiav cov kev daws teeb meem tshiab los txhim kho qhov ua tau zoo, zoo thiab ruaj khov ntawm nws cov khoom, peb yuav pom kev siv dav dua ntawm HPMC thiab HEMC hauv SLC yav tom ntej.
Post lub sij hawm: Aug-11-2023