Hydroxypropyl methylcellulose (HPMC) yog cov khoom siv dav siv hauv kev tsim kho kev lag luam, tshwj xeeb tshaj yog cov khoom siv cement. Nws cov khoom tshwj xeeb ua rau nws yog ib qho tseem ceeb hauv ntau yam kev siv, los ntawm kev txhim kho kev ua haujlwm kom txhim kho kev ua tau zoo thiab ua haujlwm ntev ntawm pob zeb thiab mortars.
1. Kev txhais thiab cov ntsiab lus ntawm hydroxypropyl methylcellulose
Hydroxypropyl methylcellulose, feem ntau abbreviated li HPMC, yog cellulose-raws li polymer muab tau los ntawm ntoo pulp los yog paj rwb. Nws yog ib tug multi-functional additive nrog tshwj xeeb rheology, adhesion thiab dej tuav zog. Thaum ntxiv rau cov ntaub ntawv cement-based, HPMC ua tus neeg sawv cev ua haujlwm ntau, cuam tshuam cov khoom tshiab thiab tawv tawv ntawm cov khoom sib xyaw.
2. Cov khoom tshiab ntawm cov ntaub ntawv cement-based: kev ua haujlwm thiab rheology
Ib lub luag haujlwm tseem ceeb ntawm HPMC hauv cov khoom siv cement yog txhim kho kev ua haujlwm. Qhov sib ntxiv ntawm HPMC txhim kho cov khoom rheological ntawm qhov sib tov, tso cai rau kev khiav zoo dua thiab yooj yim ntawm kev tso. Qhov no yog qhov tseem ceeb tshwj xeeb hauv cov ntawv thov xws li kev tso chaw ua vaj tse thiab kev siv tshuaj khib nyiab, qhov chaw ua haujlwm yog qhov tseem ceeb.
3. Kev tuav dej
HPMC ua raws li cov dej khaws cia, tiv thaiv cov dej ntau dhau los ntawm cov ntaub ntawv cementitious thaum ntxov ntawm kev kho. Qhov kev txhim kho dej khaws cia no pab tswj cov dej kom zoo rau cov cement hais, txhawb kev txhim kho lub zog thiab kav ntev.
4. Hardening zog, lub zog thiab durability ntawm cov khoom siv cement
Kev cuam tshuam ntawm HPMC ntawm hardening zog ntawm cov ntaub ntawv cement-based yog qhov tseem ceeb. HPMC pab txhawb lub zog compressive ntawm pob zeb los ntawm kev txhim kho kev ua haujlwm thiab kev tuav dej hauv lub xeev tshiab. Tsis tas li ntawd, cov txheej txheem hydration txhim kho hauv cov duab hluav taws xob, uas ua rau cov khoom siv ruaj khov rau ib puag ncig xws li khov-thaws mus thiab muaj tshuaj lom neeg.
5. Txo shrinkage
Cov ntaub ntawv cement-based feem ntau ntsws thaum lub sijhawm kho, ua rau tawg. HPMC daws qhov teeb meem no los ntawm kev txo cov dej xav tau ntawm cov khoom sib xyaw, yog li txo qhov peev xwm ntawm cov kab nrib pleb. Cov dej tswj cov ntsiab lus txhawb nqa los ntawm HPMC pab tswj qhov kev ruaj ntseg ntawm cov khoom siv tawv.
6. Adhesion thiab adhesive zog
HPMC pab txhim kho cov khoom sib txuas ntawm cov khoom siv cement thiab txhim kho cov adhesion ntawm cov ntaub ntawv thiab ntau yam substrates. Qhov no yog tshwj xeeb tshaj yog ib qho tseem ceeb nyob rau hauv daim ntawv thov xws li pobzeb adhesives thiab plasters, qhov twg muaj zog daim ntawv cog lus yog ib qho tseem ceeb rau lub neej ntev thiab kev ua tau zoo ntawm lub tsev.
7. Txhim kho kev sib raug zoo
Ntxiv nrog rau kev txhim kho adhesion, HPMC kuj tuaj yeem txhim kho kev sib koom ua ke ntawm cov khoom nws tus kheej. Qhov no yog qhov muaj txiaj ntsig zoo uas cov khoom siv cement-based yuav tsum tau ua raws li qhov chaw ntsug lossis tuav lawv cov duab thaum siv.
8. Cov Kev Sib Tw thiab Kev Txiav Txim Siab Kev Noj Qab Haus Huv thiab Kev Sib Raug Zoo
Thaum HPMC muaj ntau qhov zoo, nws txoj kev ua tau zoo yog nyob ntawm kev noj kom raug. Kev siv ntau dhau lossis siv tsis raug ntawm HPMC tuaj yeem ua rau muaj kev cuam tshuam tsis zoo xws li ncua sijhawm teem sijhawm lossis txo lub zog. Tsis tas li ntawd, compatibility nrog rau lwm yam additives thiab admixtures yuav tsum tau txiav txim siab los xyuas kom meej kev ua tau zoo nyob rau hauv ib tug tshwj xeeb daim ntawv thov.
9. Kev cuam tshuam rau ib puag ncig
Qhov kev cuam tshuam ib puag ncig ntawm kev siv HPMC hauv cov khoom siv yog qhov kev txhawj xeeb loj zuj zus. Thaum HPMC nws tus kheej yog biodegradable, tag nrho kev ruaj ntseg ntawm nws cov khoom tsim thiab siv yuav tsum tau xav txog. Cov kws tshawb fawb thiab cov kws tshaj lij hauv kev lag luam tab tom tshawb nrhiav lwm cov khoom siv hauv ib puag ncig uas tuaj yeem muab cov txiaj ntsig zoo sib xws yam tsis muaj kev cuam tshuam ib puag ncig.
nyob rau hauv xaus
Hauv cov ntsiab lus, hydroxypropyl methylcellulose plays lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm ntawm cov khoom siv cement. Los ntawm kev txhim kho kev ua haujlwm thiab kev tuav dej hauv lub xeev tshiab kom nce lub zog, ua haujlwm ntev thiab ua kom zoo hauv lub xeev tawv, HPMC pab txhim kho tag nrho cov khoom siv hauv tsev. Txawm li cas los xij, kom paub txog tag nrho lub peev xwm ntawm HPMC thaum ua kom muaj kev tsim kho kom ruaj khov, ntau npaum li cas, kev sib raug zoo thiab kev cuam tshuam ib puag ncig yuav tsum tau ua tib zoo xav. Raws li kev tsim kho kev lag luam txuas ntxiv mus, kev tshawb fawb thiab kev txhim kho txuas ntxiv tuaj yeem ua rau muaj kev hloov kho tshiab hauv kev siv thev naus laus zis ntxiv, muab kev txhim kho kev daws teeb meem rau cov teeb meem uas tau ntsib los ntawm kev tsim kho niaj hnub no.
Post lub sij hawm: Dec-12-2023