Hydroxypropyl methylcellulose (HPMC, Hydroxypropyl Methylcellulose) yog cov khoom siv sib xyaw ua ke uas siv dav hauv cov khoom siv hauv tsev, tshwj xeeb tshaj yog cov khib nyiab qhuav, gypsum thiab lwm yam khoom siv hauv tsev. Nws yog ib qho tseem ceeb muaj nyob rau hauv kev tsim kho kev lag luam vim nws cov tshuaj lom neeg thiab lub cev muaj zog.
1. Cov dej tuav tau zoo heev
Ib qho ntawm cov khoom tseem ceeb tshaj plaws ntawm HPMC yog nws cov dej tuav tau zoo heev. Hauv kev tsim kho, cov khoom siv xws li cov cement, gypsum thiab mortar yuav tsum muaj cov dej noo kom zoo thaum tsim kho kom muaj dej txaus thiab yog li txhim kho kev tsim kho kom zoo. Txawm li cas los xij, thaum cov khoom siv hauv tsev raug huab cua, noo noo yooj yim evaporates, ua rau lawv qhuav sai heev, ua rau tawg lossis tsis muaj zog. HPMC absorbs dej los ntawm cov pab pawg hydrophilic hauv nws cov qauv molecular thiab tsim cov yeeb yaj kiab nyias, uas tuaj yeem ua rau txo qis dej.
Cov dej khaws cia zoo li no tshwj xeeb tshaj yog nyob rau hauv mortar qhuav. Thaum sib xyaw nrog dej, HPMC tuaj yeem kaw cov dej noo thiab tiv thaiv nws los ntawm evaporating ntxov ntxov thaum thov. Qhov no tsis yog tsuas yog ncua sij hawm ua haujlwm, tab sis kuj tso cai rau lub mortar kom zoo dua rau lub substrate nto, kom ntseeg tau zoo zog thiab durability ntawm cov ntaub ntawv thov.
2. Thickening thiab txhim kho kev ua haujlwm
HPMC muaj cov nyhuv thickening tseem ceeb hauv cov tshuaj aqueous. Tom qab nws cov molecules tau yaj hauv dej, lawv tuaj yeem tsim cov kua nplaum sib xws, yog li ua kom cov viscosity thiab fluidity ntawm cov cement, mortar lossis gypsum. Lub rheology ntawm cov khoom siv hauv tsev yog qhov tseem ceeb rau kev tsim kho. Lub fluidity thiab sib xws ntawm cov khoom siv tuaj yeem cuam tshuam nws qhov adhesion rau substrate thiab kev ua haujlwm zoo.
Kev siv HPMC thickener tuaj yeem tsis tsuas yog txhim kho kev ruaj ntseg ntawm cov khoom thiab tiv thaiv cov slurry los ntawm delaminating los yog nyob rau hauv lub sij hawm sib tov los yog kev thauj mus los, tab sis kuj xyuas kom meej tias cov khoom yog ib qho yooj yim mus thov thiab kis tau thaum lub sij hawm tsim kho thiab tsis txhob sagging los yog sagging ntawm cov khoom. Piv txwv li, hauv cov nplais pobzeb nplaum, HPMC tuaj yeem txhim kho qhov kev ua haujlwm ntawm cov slurry, ua rau cov vuas ceramic tsis tshua muaj kev poob qis thaum raug tsim los ntawm qhov chaw ntsug, txhim kho kev tsim kho thiab raug.
3. Txhim kho qhov tawg tsis kam thiab shrinkage kuj
Hauv cov khoom siv hauv tsev, tshwj xeeb tshaj yog cov khoom siv cement, cov kab nrib pleb feem ntau tshwm sim vim tsis muaj dej noo los yog cov dej tsis sib xws. Raws li cov khoom siv polymer, HPMC tuaj yeem muab kev hloov pauv me ntsis thaum cov khoom dries, yog li txo qhov tshwm sim ntawm cov kab nrib pleb. Nws cov dej tuav kuj tseem pab cov cement kom hydrate tusyees thiab zam qhov tsis sib xws los ntawm kev poob dej sai, yog li txo qhov kev pheej hmoo ntawm cov khoom tawg.
HPMC lub peev xwm ua yeeb yaj kiab kuj tseem txhim kho qhov tawv tawv ntawm cov khoom siv hauv tsev, ua rau lawv tsis tshua tawg lossis tawg nyob rau hauv kev cuam tshuam ntawm sab nraud. Cov cuab yeej no yog qhov tseem ceeb tshwj xeeb tshaj yog thaum siv rau sab nrauv phab ntsa plasters lossis gypsum cov ntaub ntawv, uas tuaj yeem txhim kho cov tsos thiab kev ruaj ntseg ntawm lub tsev.
4. Txhim kho kev sib raug zoo
Hauv kev tsim vaj tsev, kev sib txuas ntawm cov khoom siv zog txiav txim siab qhov kev ntseeg ntawm lub tsev tsim qauv. HPMC tuaj yeem txhim kho lub zog sib txuas ntawm cov khoom siv thiab cov substrate los ntawm kev kho cov khoom rheological thiab dej tuav ntawm cov khoom. Tshwj xeeb tshaj yog nyob rau hauv daim ntawv thov xws li pobzeb adhesives, sab nrauv phab ntsa putties, thiab plastering mortars, HPMC tuaj yeem xyuas kom meej tias cov mortar tuaj yeem ntub dej ntawm cov substrate thiab tsim kom muaj zog adhesion.
Qhov kev sib koom ua ke no tsis yog tsuas yog txhim kho kev tsim kho kom zoo, tab sis kuj txo qhov kev pheej hmoo ntawm cov khoom poob los yog xoob tom qab kev tsim kho. Tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej uas yuav tsum muaj kev sib raug zoo siab xws li cov tsev siab siab thiab kev tsim kho phab ntsa sab nrauv, qhov sib ntxiv ntawm HPMC tuaj yeem txhim kho lub zog tensile ntawm cov khoom thiab ua kom lub neej kev pab cuam ntawm lub tsev.
5. Txhim kho khov-thaw tsis kam
Hauv cov cheeb tsam txias, cov khoom siv hauv tsev feem ntau ntsib cov voj voog khov-thaw, uas tuaj yeem ua rau muaj kev puas tsuaj loj rau cov khoom siv thiab lub zog. Kev tuav dej thiab hloov tau yooj yim ntawm HPMC ua rau nws muaj txiaj ntsig zoo los txo kev puas tsuaj rau cov ntaub ntawv cement-based thaum lub caij khov-thaw.
Los ntawm kev tsim cov qauv sib txuas yooj yim hauv cov khoom siv khib nyiab thiab cov cement, HPMC tuaj yeem txo qhov kev nthuav dav ntawm cov dej thaum lub sij hawm khov thiab thawing txheej txheem thiab txo qhov tsim ntawm microcracks los ntawm khov. Tsis tas li ntawd, kev ua yeeb yaj kiab ntawm HPMC tuaj yeem tiv thaiv cov dej noo ntau dhau los ntawm kev nkag mus rau hauv cov khoom nto, yog li txo lub cev kev puas tsuaj los ntawm kev khov-thaw mus, txhim kho cov khoom khov-thaw, thiab txhim kho nws lub sij hawm ntev nyob rau hauv hnyav. ib puag ncig.
6. Ib puag ncig tus phooj ywg thiab tsis muaj tshuaj lom
HPMC yog cov khoom siv ntsuab thiab ib puag ncig zoo. Nws cov txheej txheem ntau lawm ua rau muaj kuab paug tsawg dua rau ib puag ncig thiab tsis tso cov tshuaj phem. Raws li ib tug natural cellulose derivative, HPMC tsis muaj teeb meem rau tib neeg lub cev thaum lub sij hawm daim ntawv thov thiab ua tau raws li cov kev cai ntawm niaj hnub tsim kev lag luam rau ib puag ncig cov ntaub ntawv.
Piv nrog rau qee cov tshuaj sib xyaw ua ke los yog cov dej khaws cia, HPMC tsis muaj cov khoom xyaw uas tsis zoo xws li cov kuab tshuaj organic lossis cov hlau hnyav, thiab nws siv hauv kev tsim kho yuav tsis ua rau muaj kev cuam tshuam tsis zoo rau ib puag ncig thiab kev noj qab haus huv ntawm cov neeg ua haujlwm tsim kho. Yog li ntawd, HPMC tau dhau los ua cov khoom siv ntxiv ntawm kev xaiv hauv ntau lub tsev ntsuab thiab ib puag ncig.
7. Kev yooj yim ntawm kev tsim kho
HPMC muaj solubility zoo thiab muaj peev xwm muab sib npaug ntawm cov khoom siv hauv tsev nrog kev sib tw yooj yim ntawm qhov chaw tsim kho, ua kom yooj yim rau kev khiav lag luam. Qhov no zoo heev txhim kho kev tsim kho kom zoo, txo cov theem kev tsim kho, thiab txo kev siv zog. Hauv thaj chaw ntawm cov tshuaj khib nyiab qhuav, cov nplais nplaum nplaum thiab cov txheej txheem dej tsis zoo, qhov sib ntxiv ntawm HPMC ua rau cov khoom sib xyaw yooj yim dua thiab tswj xyuas kev ua haujlwm zoo rau lub sijhawm ntev, yog li cov neeg ua haujlwm tsim kho tuaj yeem ua tiav kev tsim kho kom zoo nyob rau lub sijhawm ntev.
8. Cov khoom siv tshuaj ruaj khov
Kev siv HPMC hauv cov ntaub ntawv tsim kho tsis yog tsuas yog muab kev ua haujlwm zoo xwb tab sis kuj muaj tshuaj lom neeg ruaj khov. Nws tuaj yeem nyob ruaj khov hauv ib puag ncig alkaline, hloov mus rau cov khoom siv tshuaj lom neeg ntawm cov cement, gypsum thiab lwm yam ntaub ntawv, thiab yuav tsis poob lossis cuam tshuam rau kev ua haujlwm ntawm cov ntaub ntawv vim muaj kev cuam tshuam nrog lwm cov khoom xyaw. Qhov no ua rau HPMC yog ib qho zoo tagnrho additive rau cement-based thiab gypsum-based cov ntaub ntawv.
HPMC tau dhau los ua ib qho tseem ceeb ntxiv hauv cov khoom siv hauv tsev vim nws cov dej tuav tau zoo, thickening, tawg tsis kam, txhim kho daim ntawv cog lus zog, khov-thaw kuj, kev tiv thaiv ib puag ncig thiab kev tsim kho yooj yim. Nws tuaj yeem txhim kho kev ua tau zoo ntawm cov khoom siv hauv tsev, txuas ntxiv kev pabcuam lub neej ntawm cov tsev, txhim kho kev tsim kho kom zoo, thiab ua tau raws li qhov yuav tsum tau muaj ntawm kev tiv thaiv ib puag ncig thiab kev tsim kho kom ruaj khov. Vim li no, HPMC tau siv ntau dua hauv kev tsim kho niaj hnub, tshwj xeeb tshaj yog nyob rau hauv thaj chaw ntawm cov mortar qhuav, gypsum khoom, pobzeb adhesives thiab sab nrauv phab ntsa putty.
Post lub sij hawm: Oct-18-2024