HPMC (HydroxyPropyyl methylcellulose) yog ib qho kev sib txuas ntxiv hauv kev txhim kho cov txheej yas, tshwj xeeb yog kev txhim kho cov dej tsis kam, rheological cov khoom siv thiab kev tsim kho cov plaster.
1. Txhim kho cov dej khaws cia ntawm plaster
HPMC yog dej-soluble polymer compound uas tuaj yeem tsim lub network qauv hauv cov cement lossis gypsum-raws plaster. Cov qauv no pab khaws dej thiab tiv thaiv cov cement lossis gypsum los ntawm kev poob dej, yog li zam kev tawg lossis txo cov dej tsis kam. Los ntawm kev ntxiv tus nqi tsim nyog ntawm HPMC mus rau lub plaster, cov txheej txheem hydration ntawm xis mas tuaj yeem ncua, ua plaster muaj peev xwm khaws tau dej. Cov hydle tsim los ntawm Maas thaum lub sijhawm cov txheej txheem hydration yuav tsum tau ua kom dej txaus los txhawb nqa cov tshuaj tiv thaiv. Kev ncua cov dej kom poob tuaj yeem txhim kho qhov ceev thiab kev tawm tsam muaj peev xwm ntawm cov khoom siv kawg.
2. Txhim kho cov nplaum thiab ntom ntawm plaster
Raws li cov polymer additive, HPMC tsis tuaj yeem tsuas txhim kho cov khoom ntawm plaster, tab sis kuj txhim kho nws cov nplaum. Thaum HPMC ntxiv rau, lub zog sib txuas ntawm lub plaster yog txhim kho, uas pab nws ua kom muaj zog ua kom lub ntsej muag (xws li cib, phab ntsa qhob). Nyob rau tib lub sijhawm, HPMC ua rau cov qauv yas thaum lub sijhawm ua kom tawv nqaij tawv, txo lub xub ntiag ntawm cov capillary pores. Tsawg dua cov nplaim txhais tau tias nws nyuaj rau cov dej kom nkag mus rau cov dej tsis kam ntawm plaster.
3. Txhim Kho Kev Tiv Thaiv Kev Tiv Thaiv
Cov qauv molecular ntawm HPMC tuaj yeem tsim cov tshuaj yeeb zoo li hauv plaster, tso cai rau cov plaster, tso cai rau cov khoom siv Microstructure thaum lub sijhawm kho cov txheej txheem. Raws li tus qauv txhim kho, cov plaster deg ua smoother thiab denser, thiab permeability ntawm dej yog txo. Yog li ntawd, cov dej tsis kam ntawm plaster yog txhim kho, ib puag ncig HPMC muaj peev xwm tiv thaiv kev ya raws los ntawm cov phab ntsa los ntawm txheej txheej txheej.
4. Txhim kho cov durability thiab waterproofness
Cov dej tsis kam nyob ntawm tsis yog nyob ntawm cov dej tsis muaj peev xwm ntawm cov khoom saum npoo av, tab sis kuj tseem cuam tshuam nrog cov qauv sab hauv ntawm cov plaster. Los ntawm kev ntxiv HPMC, lub cev thiab tshuaj ruaj khov ntawm plaster tuaj yeem txhim kho. HPMC txhim kho cov tshuaj lom neeg tsis kam ntawm plaster thiab zam txoj cai xis mas xeb tshwm sim los ntawm kev nkag mus. Tshwj xeeb tshaj yog nyob rau hauv lub sijhawm ntev lim hiam lossis noo ib puag ncig, HPMC pab kom txuas ntxiv kev pabcuam lub neej ntawm cov khoom siv plaster thiab txhim kho nws cov khoom siv tiv thaiv kev laus.
5. Kho viscosity thiab ua haujlwm
HPMC Kuj tseem muaj txoj haujlwm ntawm kev kho viscosity thiab rheological cov khoom. Hauv kev tsim kho tiag tiag, tsim nyog viscosity tuaj yeem ua kom yooj yim ntws thaum ua ntawv thov, thiab tuaj yeem muaj tusyig rau lub caij nplooj zeeg kom poob rau thaum lub sijhawm noo noo. Los ntawm kev tswj lub zog ntawm plaster, cov neeg ua haujlwm tsim kho tuaj yeem tswj cov kev sib txuam ntawm lub plaster, li txhim kho kev txhim kho dej tsis huv ntawm cov plaster.
6. Txhim Kho Kev Tiv Thaiv
Thaum lub sij hawm tsim qauv, plaster yog nquag los shrinkage vim sov li kub xws li cov av noo hloov pauv, ua rau muaj cov kab nrib pleb. Lub xub ntiag ntawm cov kab nrib pleb tsis tsuas yog cuam tshuam cov tsos ntawm plaster, tab sis kuj muab cov channel rau kev nkag mus. Qhov kev sib txuas ntawm HPMC tuaj yeem nce cov tawv ntawm plaster, ua kom nws muaj cov txheej txheem ua kom ntub dej, yog li tsis txhob ya raws ntawm cov kab nrib pleb thiab txo qis kev pheej hmoo ntawm cov dej nkag mus.
7. Txhim kho kev yoog tau thiab kev tsim kho yooj yim
Qhov kev sib ntxiv ntawm HPMC kuj tseem tuaj yeem ua cov plaster ntxiv yoog raws sib txawv huab cua. Nyob rau hauv ib puag ncig kub ntau zaus, noo noo ntawm lub plaster ntawm lub plaster ntawm cov plaster evaporates dhau nrawm thiab yog nquag mus tawg. Lub xub ntiag ntawm HPMC pab lub plat khaub ncaws khaws cia hauv ib puag ncig qhuav, yog li nws txoj kev kho kom zoo thiab cov kab nrib pleb thiab dej tsis huv los ntawm kev ziab khaub ncaws nrawm dhau. Ib qho ntxiv, HPMC tseem tuaj yeem txhim kho cov nplaum ntawm plaster, kom nws tuaj yeem ua kom muaj cov nplaum zoo ntawm cov chaw sib txawv thiab tsis yooj yim los poob tawm.
HPMC plays Lub luag haujlwm tseem ceeb hauv kev txhim kho cov dej tsis kam ntawm plaster, feem ntau los ntawm cov hauv qab no:
Dej khaws cia: Ncua Maas dej, khaws noo noo, thiab tiv thaiv kom ceev dhau kom qhuav.
Adhesion thiab ntom ntom: txhim kho cov nplaum ntawm plaster mus rau hauv paus nto thiab ua tus qauv tuab.
Kev tso cai tiv thaiv: Txo cov hws thiab tiv thaiv kom tsis txhob muaj dej.
Durability thiab waterproofness: txhim kho cov tshuaj thiab lub cev ruaj khov ntawm cov khoom siv thiab txuas lub neej pabcuam.
Nthuav tawm tiv thaiv: nce cov tawv ntawm cov plaster thiab txo qhov kev tsim cov kab nrib pleb.
Kev tsim kev tsim kho kev tsim kho: txhim kho cov yam ntxwv ntawm plaster thiab txhim kho cov haujlwm ua haujlwm thaum kev tsim kho. Yog li, HPMC tsis yog ib qho kev ntxiv los txhim kho kev tsim kho cov plaster, tab sis cov plaster tuaj yeem tswj tau ruaj khov thiab ntev ntev nyob rau ntau qhov chaw hnyav.
Sijhawm Sijhawm: NOV-20-2024