HPMC (Hydroxypropyl methylcellulose)yog cov khoom siv dej-soluble polymer uas tau siv dav hauv cov khoom siv cement, tshwj xeeb tshaj yog nyob rau hauv kev tsim cov khoom siv khib nyiab qhuav, pobzeb nplaum, phab ntsa txheej, gypsum thiab lwm yam khoom siv hauv tsev.
1. Txhim kho kev ua haujlwm thiab kev ua haujlwm
HPMC muaj cov nyhuv thickening zoo heev thiab tuaj yeem txhim kho qhov fluidity thiab viscosity ntawm cov khoom siv cement, ua kom yooj yim rau kev khiav lag luam thaum siv. Tom qab ntxiv HPMC, kev ua haujlwm ntawm cov ntaub ntawv xws li tshuaj khib thiab cov nplaum yog qhov zoo dua qub, ua rau nws yooj yim rau cov neeg siv los thov, trowel, thiab lwm yam, txo cov kev sib txhuam thaum lub sij hawm tsim kho, thiab txhim kho kev tsim kho kom zoo thiab zoo.
2. Txuas sijhawm qhib thiab txhim kho kev tsim kho kom zoo
HPMC tuaj yeem ncua lub sijhawm pib ntawm cov khoom siv cement, tso cai rau cov neeg ua haujlwm tsim kho kom muaj sijhawm ua haujlwm ntev dua thaum lub sijhawm tsim kho. Lub sijhawm qhib kev tsim kho tom qab ntawm cov khoom siv cement (piv txwv li lub sijhawm cov khoom tseem tuaj yeem siv ua ntej hardening) yog txuas ntxiv. Rau cov kev tsim kho loj lossis kev tsim kho cov txheej txheem nyuaj, txuas ntxiv lub sijhawm qhib tuaj yeem txo cov teeb meem kev tsim kho thiab kev puas tsuaj los ntawm kev ua kom muaj zog ntawm cov ntaub ntawv ntxov, tshwj xeeb tshaj yog nyob rau hauv qhov chaw kub kub.
3. Txhim kho adhesion thiab dej tsis kam
HPMC tuaj yeem txhim kho qhov adhesion ntawm cov khoom siv cement, tso cai rau lawv ua raws li cov substrate zoo dua thiab txhim khu kev sib txuas ntawm cov khoom sib txawv. Hauv cov ntawv thov xws li pobzeb nplaum thiab gypsum, HPMC tuaj yeem txhim kho qhov adhesion ntawm lub hauv paus nto thiab txo qhov kev pheej hmoo ntawm kev poob ntawm cov vuas, gypsum boards thiab lwm yam ntaub ntawv. Tsis tas li ntawd, HPMC muaj cov dej tsis zoo, uas tuaj yeem txhim kho kev ua haujlwm ntawm cov khoom siv cement hauv cov chaw ntub dej, txo qhov cuam tshuam ntawm cov dej noo ntawm cov ntaub ntawv cementitious, thiab txuas ntxiv lub neej kev pab cuam ntawm cov ntaub ntawv.
4. Txhim khu kev ua haujlwm tawg
Kev siv ntawmHPMCnyob rau hauv cov khoom siv cement-based pab txhim kho kev sib tsoo, tshwj xeeb tshaj yog nyob rau hauv cov nqe lus ntawm ziab shrinkage. Cement mortar yog qhov ua rau tawg thaum lub sij hawm evaporation txheej txheem ntawm dej. HPMC tuaj yeem kho cov dej evaporation tus nqi ntawm cov khoom siv cement los txo qhov tshwm sim ntawm cov kab nrib pleb. Los ntawm kev hloov cov txheej txheem hydration ntawm cov khoom siv cement, HPMC tuaj yeem txo cov kab nrib pleb uas tshwm sim los ntawm qhov sib txawv ntawm qhov kub thiab txias, cov av noo hloov los yog kev ntxhov siab sab hauv ntawm cov khoom cement-based nws tus kheej, yog li txhim kho cov khoom ruaj khov.
5. Txhim khu kev tiv thaiv foaming thiab stability
HPMC tuaj yeem tswj tau cov ntsiab lus npuas hauv cov khoom siv cement thiab txhim kho lawv cov khoom ua npuas ncauj. Qhov tshwm sim ntawm npuas hauv cov khoom siv cement yuav cuam tshuam rau lub zog, compactness thiab zoo li ntawm cov khoom. Qhov sib ntxiv ntawm HPMC tuaj yeem txhim kho cov qauv ntawm cov slurry thiab txo qhov tsim ntawm npuas, yog li txhim kho cov compactness thiab tag nrho kev ua tau zoo ntawm cov khoom.
6. Txhim kho qhov smoothness thiab tsos
Hauv ntau cov khoom siv cement-based, deg smoothness thiab zoo li zoo muaj feem cuam tshuam rau kev lag luam kev sib tw ntawm cov khoom kawg. HPMC tuaj yeem txhim kho cov dej ntws ntawm cov khoom cement-based, ua kom lawv cov npoo smoother thiab smoother, thiab txo qhov tsis xws luag xws li tev thiab npuas thaum tsim kho, yog li txhim kho qhov zoo ntawm cov khoom. Tshwj xeeb tshaj yog nyob rau hauv daim ntawv thov xws li coatings thiab pobzeb adhesives, HPMC tuaj yeem xyuas kom meej tias qhov chaw tsis muaj qhov tsis zoo thiab ua tiav qhov pom kev zoo dua.
7. Txhim kho adjustability thiab versatility
HPMC yog cov khoom siv uas tuaj yeem hloov kho raws li qhov xav tau sib txawv. Los ntawm kev hloov nws cov qauv molecular (xws li qib sib txawv ntawm hydroxypropylation, methylation, thiab lwm yam), kev ua haujlwm thickening, solubility, ncua sij hawm teem sijhawm thiab lwm yam ntxwv ntawm HPMC tuaj yeem hloov kho, yog li muab kev kho kom haum rau ntau hom cement-based khoom. daws. Piv txwv li, rau kev ua tau zoo ntawm cov nplais nplaum nplaum thiab kho cov mortars, cov qauv sib txawv ntawm HPMC tuaj yeem siv los ua kom tau raws li kev tsim kho sib txawv.
8. Txhawb kev tiv thaiv ib puag ncig thiab kev txuag hluav taws xob
Raws li cov khoom siv polymer ntuj, HPMC feem ntau tsis muaj tshuaj lom, tsis muaj mob thiab ua tau raws li kev tiv thaiv ib puag ncig. Kev siv HPMC cov khoom siv cement tsis tsuas yog txhim kho kev tsim kho, tab sis kuj txo cov kev cuam tshuam tsis zoo rau ib puag ncig. Tsis tas li ntawd, qhov sib ntxiv ntawm HPMC tuaj yeem txo qis cov cement, txuag lub zog, thiab pab txhim kho kev ua haujlwm ntev ntawm cov khoom siv cement thiab txo cov nqi tu.
9. Txhim kho thermal stability
HPMC muaj qee yam kev ruaj ntseg thermal thiab tuaj yeem ua haujlwm ruaj khov ntawm qhov kub siab dua. Hauv qee qhov kev siv tshwj xeeb, xws li cov khoom siv cement hauv qhov chaw kub kub, HPMC tuaj yeem muab cov thermal stability zoo dua, kom ntseeg tau tias cov khoom tseem tuaj yeem tswj xyuas kev tsim kho zoo thiab ua haujlwm tau zoo nyob rau hauv qhov kub thiab txias.
10. Txhim khu fluidity thiab uniformity
HPMC tuaj yeem ua rau cov khoom xyaw hauv cov khoom siv cement ntau sib npaug thiab txo qhov kev ua haujlwm sib txawv los ntawm qhov tsis sib xws. Nws txhim kho lub fluidity ntawm slurry thiab zam qhov tshwm sim ntawm clumps los yog particle settling, yog li xyuas kom meej uniformity thiab sib xws thoob plaws hauv cov khoom sib tov.
Raws li ib qho ntxiv rau cov khoom siv cement,HPMCtuaj yeem tsis tsuas yog txhim kho kev ua haujlwm, adhesion, dej tsis kam, tawg tsis kam thiab qhov zoo ntawm cov khoom, tab sis kuj txhim kho kev tsim kho thiab txuas ntxiv lub neej kev pab cuam ntawm cov khoom. Nws cov khoom zoo heev ntawm thickening, retarding solidification, txhim kho cov kab nrib pleb, anti-foaming thiab regulating fluidity ua HPMC ib tug indispensable functional additive nyob rau hauv niaj hnub tsev cov ntaub ntawv. Raws li kev tsim kho kev lag luam qhov kev thov rau cov ntaub ntawv ua tau zoo nce, daim ntawv thov ntawm HPMC hauv cov khoom siv cement yuav dhau los ua ntau dua.
Post lub sij hawm: Dec-07-2024