HPMC, tseem hu ua hydroxypropyl methylcellulose, yog ib qho khoom siv zoo heev uas siv dav hauv kev tsim kho kev lag luam, tshwj xeeb hauv kev tsim cov phab ntsa putty. Phab ntsa putty yog siv los npaj thiab theem phab ntsa ua ntej pleev xim, yog li muab qhov ua tiav zoo meej.
Ntau tus neeg tsim khoom tau muaj teeb meem nrog sagging yav dhau los. Sag tshwm sim thaum putty pib swb tawm ntawm phab ntsa vim nws qhov hnyav. Qhov no ua rau muaj qhov tsis sib xws thiab tsis ua haujlwm tiav uas yuav siv sijhawm ntau thiab siv zog los kho. Txawm li cas los xij, cov neeg tsim khoom tau pom qhov kev daws teeb meem los ntawm kev ntxiv HPMC rau phab ntsa putty, uas pab txhim kho lub sag kuj thiab tag nrho cov khoom zoo kawg nkaus.
Muaj ntau qhov laj thawj vim li cas HPMC yog qhov zoo li no ntxiv. Ua ntej, nws ua raws li lub thickener, uas txhais tau hais tias nws pab ua kom cov viscosity ntawm cov khoom putty. Qhov no nce viscosity ua rau nws nyuaj rau cov khoom xaub tawm ntawm phab ntsa thiab ua kom yooj yim adhesion rau saum npoo. Lub putty's enhanced viscosity kuj ua rau nws sau microcracks thiab cov kab noj hniav me me hauv cov phab ntsa, muab cov smoother, ntau dua qhov chaw. Cov yam ntxwv no tseem yuav pab txo qis cov putty uas yuav tsum tau los npog thaj tsam ntawm qhov chaw, ua rau muaj txiaj ntsig zoo dua.
Qhov thib ob, HPMC plays lub luag haujlwm tseem ceeb hauv kev tswj kom qhuav nrawm ntawm phab ntsa putty. Kev ziab nrawm ncaj qha cuam tshuam rau sag tsis kam ntawm putty, thiab qeeb-drying putty feem ntau ruaj khov thiab tsis yooj yim rau sag. HPMC pab tswj tus nqi ntawm evaporation ntawm cov dej hauv cov khoom siv putty, uas nyob rau hauv lem cuam tshuam nws lub sij hawm ziab. Qhov kev muab no ua rau muaj kev ruaj khov thiab zoo ib yam putty uas dries tusyees, txo txoj hauv kev ntawm sagging.
HPMC kuj tseem siv tau los txhim kho qhov adhesion ntawm phab ntsa putty thiab substrate. Adhesion yog hais txog qib uas cov khoom siv putty adheres rau saum npoo nws yog siv rau. HPMC tuaj yeem txhim kho qhov adhesion zoo vim tias nws muab cov yeeb yaj kiab tiv thaiv ntawm qhov chaw, uas txhim kho qhov adhesion ntawm putty rau substrate.
Tsis tas li ntawd, HPMC tseem tuaj yeem pab khaws cov dej noo hauv cov ntaub ntawv phab ntsa. Txawm hais tias dej yog qhov nruab nrab tseem ceeb rau kev ua cov txheej txheem putty thiab solidification, nws tseem yog lub ntsiab ua rau tawg thiab sagging ntawm cov khoom thaum cov dej evaporates sai heev. HPMC pab khaws cov dej noo hauv cov khoom siv rau lub sijhawm ntev, tso cai rau cov putty kom sib npaug thiab qhuav yam tsis muaj sagging.
Txhawm rau ua kom tiav, HPMC yog qhov tseem ceeb thiab muaj txiaj ntsig zoo ntxiv rau hauv phab ntsa putty, uas ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov khoom tiv thaiv ntawm phab ntsa putty. Nrog nws cov thickening, ziab tus nqi tswj, kev txhim kho adhesion thiab dej tuav cov khoom, HPMC muab cov neeg tsim khoom siv los daws cov teeb meem sag thiab txhim kho tag nrho cov khoom kawg. Qhov kom zoo dua yog tsis tsuas yog nyob rau hauv lub smoother, ruaj khov nto tiav, tab sis kuj nyob rau hauv tus nqi-zoo ntawm cov tshuaj. Yog li, nws yuav tsum tau lees paub thiab hais txog lub luag haujlwm tsis hloov pauv ntawm HPMC hauv kev tsim kho kev lag luam.
Post lub sij hawm: Aug-15-2023