Hydroxypropyl methylcellulose (HPMC) yog ib qho khoom siv polymer uas siv dav hauv ntau yam lag luam nrog rau kev tsim kho. Hauv daim ntawv thov gypsum, HPMC ua hauj lwm raws li ib qho tseem ceeb additive nrog ntau yam kev pab cuam uas pab txhim kho tag nrho cov kev ua tau zoo thiab zoo ntawm gypsum formulations.
Taw qhia rau hydroxypropyl methylcellulose:
Hydroxypropyl methylcellulose yog ib tug semi-synthetic polymer muab los ntawm cellulose, ib tug natural polymer pom nyob rau hauv cov nroj tsuag. HPMC yog synthesized los ntawm kev kho cellulose nrog propylene oxide thiab methyl chloride, uas ua rau cov tebchaw nrog txhim kho zog piv rau cov niam txiv cellulose. Qhov degree ntawm kev hloov pauv (DS) ntawm hydroxypropyl thiab methoxy pawg ntawm cov pob txha cellulose txiav txim siab cov khoom tshwj xeeb ntawm HPMC.
Cov yam ntxwv ntawm HPMC:
Kev tuav dej:
HPMC muaj cov khoom tuav dej zoo heev thiab tuaj yeem tsim cov yeeb yaj kiab nyias ntawm cov gypsum kom qeeb dej evaporation. Qhov no yog qhov tseem ceeb kom ua tiav qhov kev kho kom zoo thiab tiv thaiv kom tsis txhob qhuav ntxov ntawm stucco.
Txhim kho machinability:
Qhov sib ntxiv ntawm HPMC txhim khu kev ua haujlwm ntawm plaster, ua kom yooj yim rau kev sib xyaw, thov thiab sib kis. Txhim kho qhov sib xws yuav pab ua kom zoo dua adhesion thiab npog ntawm ntau qhov chaw.
Tswj lub sijhawm teem sijhawm:
HPMC tso cai rau kev tswj hwm ntau dua rau lub sijhawm teeb tsa ntawm plaster. Los ntawm kev hloov kho HPMC cov ntsiab lus, cov tuam txhab tsim khoom tuaj yeem tsim cov sijhawm teem sijhawm kom tau raws li qhov tshwj xeeb yuav tsum tau ua, ua kom cov ntawv thov zoo thiab ua tiav.
Ntxiv sijhawm qhib:
Lub sijhawm qhib yog lub sijhawm uas lub plaster tseem ua haujlwm ua ntej nws teev. HPMC tau txuas ntxiv nws cov sijhawm qhib los muab cov kws tsim khoom thiab cov neeg ua haujlwm nrog lub sijhawm so kom txaus rau kev thov thiab ua tiav cov haujlwm.
Txhim kho adhesion:
Cov khoom ua yeeb yaj kiab ntawm HPMC pab txhim kho kev sib raug zoo ntawm plaster thiab substrate. Qhov no yog ib qho tseem ceeb tshwj xeeb los xyuas kom meej lub neej ntev thiab durability ntawm plastered nto.
Crack kuj:
HPMC pab txo qhov tshwm sim ntawm cov kab nrib pleb hauv plaster los ntawm kev ua kom nws yooj yim thiab lub zog. Qhov no yog qhov tseem ceeb los tswj cov txheej txheem kev ncaj ncees ntawm plastered nto nyob rau lub sij hawm ntev.
Txhim kho rheology:
Rheology hais txog kev khiav thiab deformation tus cwj pwm ntawm cov khoom. HPMC tuaj yeem hloov kho cov khoom rheological ntawm gypsum, muab nws qhov kev xav tau sib xws rau kev siv yooj yim dua thiab qib.
Daim ntawv thov ntawm HPMC hauv gypsum:
Gypsum plaster:
Nyob rau hauv gypsum formulations, HPMC feem ntau yog siv los txhim kho cov dej tuav, ua hauj lwm thiab adhesion. Nws kuj tseem pab tswj kev teeb tsa lub sijhawm thiab txhim kho kev ua haujlwm tag nrho ntawm gypsum-based stucco.
Cement-based plastering:
HPMC yog dav siv nyob rau hauv cement-based plasters qhov twg nws yog ib qho tseem ceeb additive kom ua tau raws li qhov yuav tsum tau rheology, qhib lub sij hawm thiab adhesion. Kev tswj xyuas lub sijhawm muaj txiaj ntsig tshwj xeeb rau kev tsim kho loj.
Txiv qaub paste:
Cov kua qaub plaster formulations tau txais txiaj ntsig los ntawm kev sib ntxiv ntawm HPMC los txhim kho cov dej tuav thiab ua haujlwm. Cov khoom siv polymer sib raug zoo nrog cov ntaub ntawv ua kua qaub ua rau nws muaj kev xaiv tsim nyog rau cov cuab yeej cuab tam thiab kev kho kom zoo dua qub.
Sab nrauv Insulation thiab Finishing Systems (EIFS):
HPMC yog ib feem tseem ceeb ntawm EIFS daim ntawv thov, pab txhim kho adhesion, yooj thiab tawg kuj. Nws cov dej tuav cov khoom muaj txiaj ntsig tshwj xeeb hauv cov txheej txheem stucco sab nrauv.
nyob rau hauv xaus:
Hydroxypropyl methylcellulose yog ib tug zoo meej additive nyob rau hauv gypsum formulations vim nws multifaceted pab rau tuav dej, ua hauj lwm, teem sij hawm tswj, adhesion thiab tawg kuj. Txawm hais tias siv hauv plaster, cement, txiv qaub lossis sab nrauv phab ntsa rwb thaiv tsev, HPMC plays lub luag haujlwm tseem ceeb hauv kev txhim kho tag nrho cov kev ua tau zoo thiab zoo ntawm plaster. Raws li kev tsim kho txuas ntxiv mus, HPMC qhov kev ua tau zoo thiab kev ntseeg tau ua rau nws yog ib qho tseem ceeb ntawm cov txheej txheem plaster niaj hnub, ua kom lub neej ntev thiab ua tiav hauv ntau yam kev tsim kho.
Post lub sij hawm: Nov-28-2023