HPMC (hydroxypropyl methylcellulose) yog cov khoom siv tshuaj lom neeg, siv dav hauv cov khoom siv hauv tsev, tshuaj, zaub mov, tshuaj pleev ib ce thiab lwm yam. Nws yog dav siv hauv cov khoom siv hauv tsev, tshwj xeeb tshaj yog nyob rau hauv mortar. Lub luag haujlwm tseem ceeb ntawm HPMC suav nrog kev txhim kho cov dej khaws cia ntawm mortar, nce viscosity, txhim kho adhesion thiab txhim kho kev tsim kho.
1. Cov khoom tseem ceeb ntawm HPMC
HPMC yog ib qho uas tsis yog-ionic cellulose ether tau los ntawm kev kho tshuaj ntawm cov paj rwb lossis ntoo pulp. Nws cov qauv molecular muaj methoxy thiab hydroxypropoxy pawg, yog li nws muaj cov dej solubility zoo thiab ua cov yeeb yaj kiab. HPMC muaj qee yam kev ua haujlwm saum npoo av, thickening thiab gelling zog, thiab tsim cov pob tshab los yog cov kua colloidal thaum yaj hauv dej txias, uas ua rau nws ua tau zoo heev hauv cov khoom siv hauv tsev.
2. Lub luag haujlwm hauv mortar
2.1 Kev tuav dej
Hauv mortar, evaporation tus nqi ntawm cov dej muaj ib qho tseem ceeb ntawm kev tsim kho kom zoo. Cov evaporation ceev heev ntawm cov dej yuav ua rau cov mortar qhuav ntxov, yog li cuam tshuam rau adhesion thiab lub zog. HPMC muaj cov dej tuav zoo heev thiab tuaj yeem khaws cov dej noo hauv cov mortar, tiv thaiv nws los ntawm kev poob dej sai heev, yog li ncua lub sijhawm qhib ntawm lub mortar thiab ua kom muaj kev tsim kho du.
2.2 Thickening nyhuv
HPMC ua raws li lub thickener nyob rau hauv lub mortar. Nws tuaj yeem ua kom cov viscosity ntawm cov mortar, ua rau nws tsis tshua muaj dej ntws thiab swb thaum tsim kho. Cov nyhuv thickening no yog qhov tseem ceeb tshwj xeeb hauv kev tsim kho façade, uas tuaj yeem tiv thaiv cov mortar los ntawm zawv zawg thaum siv rau phab ntsa.
2.3 Txhim kho adhesion
Lub adhesion ntawm mortar yog ib qho ntawm nws cov khoom tseem ceeb, uas cuam tshuam ncaj qha rau kev tsim kho thiab kev pabcuam lub neej ntawm lub tsev. HPMC tuaj yeem txhim kho qhov adhesion ntawm cov mortar, cia cov mortar ua kom ruaj khov rau hauv substrate thaum thov, tshwj xeeb tshaj yog nyob rau ntawm qhov chaw du.
2.4 Txhim kho kev tsim kho kev ua haujlwm
HPMC tseem tuaj yeem txhim kho kev tsim kho ntawm cov mortar, ua rau nws ua haujlwm tau zoo dua. Tshwj xeeb, cov mortar yog smoother thiab zoo ib yam thaum siv, thiab yog yooj yim rau kev thov thiab du, yog li txo qhov nyuaj ntawm kev tsim kho thiab txhim kho kev tsim kho.
3. Daim ntawv thov teb
HPMC yog dav siv nyob rau hauv ntau hom mortars, xws li tab sis tsis txwv rau cov pobzeb adhesives, sab nrauv phab ntsa rwb thaiv tsev mortars, self-leveling mortars, plaster mortars, thiab lwm yam. nyob rau sab nrauv phab ntsa rwb thaiv tsev mortars, HPMC tuaj yeem ua kom cov adhesion ntawm cov txheej rwb thaiv tsev thiab cov txheej hauv qab kom tsis txhob ntog; nyob rau hauv tus kheej-leveling mortars, HPMC tuaj yeem txhim kho fluidity thiab dej tuav, ua rau cov mortar smoother.
4. Ceev faj rau kev siv
Txawm hais tias HPMC muaj ntau yam kev siv thiab kev ua tau zoo hauv mortars, cov ntsiab lus hauv qab no tseem yuav tsum tau sau tseg thaum siv:
Kev tswj kev noj tshuaj: Cov koob tshuaj ntawm HPMC yuav tsum tau hloov kho raws li hom tshuaj khib thiab cov kev tsim kho tshwj xeeb. Kev noj ntau dhau yuav ua rau cov tshuaj khib nyiab ntau dhau thiab cuam tshuam rau kev tsim kho; Kev noj tshuaj tsawg dhau yuav tsis ua tiav qhov kev xav tau.
Kev sib xyaw ua ke: Thaum npaj mortar, HPMC yuav tsum tau muab sib xyaw ua ke kom ntseeg tau tias nws sib npaug sib npaug hauv cov tshuaj khib nyiab, txwv tsis pub nws yuav ua rau kev ua haujlwm tsis sib xws.
Cia tej yam kev mob: HPMC yuav tsum tau muab cia rau hauv ib tug qhuav thiab txias ib puag ncig, tsis txhob ya raws los tiv thaiv kom txhob ya raws thiab agglomeration, uas yuav cuam tshuam rau kev siv.
Raws li cov khoom siv tshuaj tseem ceeb, daim ntawv thov ntawm HPMC hauv mortar tau txhim kho kev ua haujlwm ntawm mortar, ua rau kev tsim kho kom zoo thiab zoo dua. Los ntawm kev txhim kho cov dej tuav, thickening, adhesion thiab kev tsim kho ntawm mortar, HPMC plays lub luag haujlwm tseem ceeb hauv cov khoom siv niaj hnub no. Nyob rau yav tom ntej, nrog kev txhim kho txuas ntxiv ntawm kev tsim kho thev naus laus zis, daim ntawv thov thiab cov txiaj ntsig ntawm HPMC tuaj yeem nthuav dav ntxiv thiab txhim kho.
Post lub sij hawm: Aug-21-2024