HPMC (HydroxyPropyyl methylcellulose) yog cov polymer compound txuas dav hauv cov ntaub ntawv hauv tsev. Raws li cov dej-soluble polymer, nws yog qhov tshwj xeeb rau kev siv hauv kev pleev xim rau xis nyob vim nws cov dej ua kom zoo dua, kev sib tuav dej, sib koom tes thiab lwm yam khoom.
1. Thickening thiab rheological txhim kho
Kev tsim kho kev ua tau zoo ntawm cov cement-ua txheej ci yog ze rau nws cov khoom siv hluav taws xob, uas cuam tshuam ncaj qha rau cov haujlwm ntawm cov txheej txheem. Raws li cov tuab dua, HPMC tuaj yeem hloov kho lub viscosity ntawm txheej kom ntseeg tau tias kev tsim kho theem thiab slurry hanging cuam tshuam thaum lub sijhawm tsim kho tau zoo. Tsoos ib txwm muaj cov txheej txheem castings yog nquag stratification thiab sagging tom qab ntxiv dej thiab nplawm. Tom qab ntxiv HPMC, txheej txheej tuaj yeem tuav cov viscerate medcosity, uas tsis yog tsuas yog yooj yim txhuam thiab yob, tab sis kuj tsis yooj yim rau sag thaum lub sijhawm ua haujlwm yooj yim.
Cov cuab yeej thickening ntawm HPMC tseem muab cov txheej txheej ib yam thixotrotropy, uas yog, cov txheej txheem yuav ua rau nws cov viscosity thawj thaum nws tseem. Cov cuab yeej no tsis tsuas yog ua rau txheej txheej txheej txheej yooj yim dua, tab sis kuj tseem yuav tswj cov kev tsim kho, yog li kev txhim kho cov kev tsim ua zoo.
2. Txhim kho cov dej rov qab
Cov cement-based txheej txheem no yog nquag mus rau shrinkage thiab tawg vim tias muaj kev sib tw dhau los thaum lub sijhawm ua kom sov lossis qhuav ib puag ncig. Lwm txoj haujlwm tseem ceeb ntawm HPMC yog nws cov dej ua haujlwm zoo. HPMC tuaj yeem tsim cov yeeb yaj kiab me me hauv kev tso cai ua kom tsis txhob muaj dej khov kho kom tsis txhob muaj dej hiav txwv sai sai. Qhov kev tswj hwm cov dej no tsis tuaj yeem tsuas yog txo qhov kev pheej hmoo ntawm kev tawg, tab sis kuj tseem txhim kho kev txhim kho lub zog ntawm cov cement.
Nyob rau hauv ib puag ncig ib puag ncig nrog cov av noo qis, dej ua kom ruaj khov ntawm HPMC yog qhov tseem ceeb tshaj plaws. Txawm tias lub hnub ci ntsa iab hauv qab, cov cement raws li cov tshuaj tua dej noo kom ntseeg tau tias, Li no tau txhim kho lub zog kawg thiab lub zog ua kom muaj zog. Qhov no yog qhov tshwj xeeb tshaj yog qhov tseem ceeb rau sab nraud phab ntsa txheej ntsa thiab lwm cov khoom siv Maas-basic raug nthuav tawm rau lub ntuj ib puag ncig.
3. Txhim kho cov nplaum thiab tawg
Thaum lub sij hawm tsim kho, cement raws li cov txheej txheem ua kom zoo, tshwj xeeb tshaj yog nyob rau ib puag ncig nrog loj kub thiab av muaj kev hloov pauv. HPMC ua cov qauv network ntawm Caas hais los ntawm nws cov qauv molecular, uas ua rau cov txheej txheem sib khi ntawm cov txheej thiab substrate. Los ntawm kev txhim kho cov nplaum ntawm txheej, HPMC ua tau zoo txo qhov kev pheej hmoo ntawm co cov xim pev lossis tawg.
HPMC kuj tseem tuaj yeem txhim kho qhov tawg kom tsis kam ntawm cov txheej. Los ntawm kev ncua ntawm cov dej evaporation thiab tswj cov kev ntxhov siab hnyav, HPMC pab kom txo cov kev ntxhov siab tsim los ntawm cov txheej txheem kom qhuav, yog li txo qhov kev sib tsoo. Qhov no yog qhov tseem ceeb rau cov caa-raws li cov txheej txheem sab nraud uas tau nthuav dav sab nraud, tshwj xeeb yog cov cua hlob thiab cov av noo hloov.
4. Txhim kho kev tiv thaiv kev tsim kho thiab ib puag ncig
HPMC kuj tseem tuaj yeem txhim kho kev tsim kho cov cement-raws li cov txheej txheem, kom nws tuaj yeem tswj cov haujlwm ua haujlwm zoo nyob rau hauv kev sib txawv ib puag ncig. Txawm hais tias nws yog qhov chaw tsim kho huab cua siab lossis qis dua thiab qis dua kev siv zog ua haujlwm, HPMC tuaj yeem ua kom lub sijhawm ua haujlwm thiab ua haujlwm yooj yim ntawm cov txheej. Tshwj xeeb tshaj yog nyob rau hauv cov txheej tsim ntawm loj-txheej txheej thiab cov qauv kev ua kom zoo heev txo tau qhov nyuaj ntawm kev tsim kho thiab txhim kho cov kev tsim kho tag nrho.
Nyob rau tib lub sijhawm, HPMC yog ib puag ncig cov khoom siv uas yuav txo tau cov kev tso tawm ntawm cov organic cov cheeb tsam (vocs). Kev siv HPMC hauv kev pleev xim rau cov cement-based tuaj yeem txo cov kuab paug rau ib puag ncig, uas yog nyob rau ib puag ncig ntawm cov ntaub ntawv hauv tsev niaj hnub. Rau cov neeg ua haujlwm tsim vaj tse, HPMC qhov tsawg toxicity thiab kev txob txob qis tseem pab txhim kho kev ua haujlwm thiab txo kev phom sij.
5. Txhim kho huab cua tsis kam thiab kav ntev
Qhov kev pabcuam lub neej ntawm kev pleev xim cement yog nyob ntawm lawv huab cua tsis kam thiab kav ntev. HPMC tuaj yeem txuas nws txoj kev pabcuam lub neej nyob rau hauv ntau yam huab cua nyab xeeb los ntawm kev txhim kho cov khoom siv lub cev ntawm txheej. HPMC cov dej ua haujlwm tuaj yeem tiv thaiv cov kab nrib pleb tshwm sim sai sai ntawm cov khoom siv kub sai sai, thaum nws sib khi ua kom lub cev ruaj khov los yog ib puag ncig txias.
HPMC kuj tseem tuaj yeem txhim kho cov txheej UV Utating UV tsis kam thiab txo cov fading lossis kev laus ntawm cov txheej vim lub hnub ci mus ntev vim lub hnub ci. Cov nyhuv synergistic ntawm HPMC thiab lwm yam kev ntxiv tuaj yeem ntxiv cov huab cua tsis kam, tso cai rau lawv tswj hwm zoo thiab muaj nuj nqi nyob rau hauv cov xwm txheej sib txawv.
6. Cov txiaj ntsig nyiaj txiag thiab cov ntawv thov thoob plaws
Txoj kev thov dav ntawm HPMC cov khoom lag luam tsis yog tsuas yog xav txog nws txoj kev txhim kho txheej txheem txheej txheem ua haujlwm, tab sis kuj coj pom cov txiaj ntsig nyiaj txiag hauv kev lag luam. Raws li ib tug zoo heev ntxiv ntxiv, HPMC tuaj yeem ua tiav cov txiaj ntsig tseem ceeb nrog cov nyiaj me me. Los ntawm kev txhim kho kev tsim kho thiab durability ntawm txheej, HPMC pab txo cov ntawv pov tseg thiab cov nqi kho mob hauv kev tsim kho.
Nyob rau tib lub sijhawm, HPMC muaj ntau cov kev siv hauv kev tso cai txheej txheem castings. Txawm hais tias nyob sab hauv tsev lossis sab nraum zoov lossis sab nraum zoov, seb cov txheej txheem phab ntsa lossis HPMC tuaj yeem muab kev txhim kho kev ua tau zoo. Tshwj xeeb tshaj yog nyob rau hauv cov txheej txheej uas yuav tsum tau tawg ua kom tawg, huab cua tiv thaiv thiab dej rov qab, HPMC yuav luag ib qho kev xaiv methplacle.
Raws li lub tsev muaj txiaj ntsig zoo ntxiv, lub luag haujlwm ntawm HPMC hauv kev pleev xim cement tsis tuaj yeem tsis quav ntsej. Los ntawm kev txhim kho hauv thickening, dej khaws cia, nce adhesion, thiab txhim kho kev txhim kho kev tsim kho thiab kev pabcuam ntawm kev tso cai. Tsis tas li ntawd, cov kev tiv thaiv ib puag ncig ntawm HPMC ua nws ua kom tau raws li cov cai ntawm kev loj hlob ntawm cov ntaub ntawv hauv tsev niaj hnub no. Yog li, HPMC tsis yog tsuas yog xaiv qhov zoo tshaj plaws rau kev txhim kho cov hmoov ywj siab rau cov cement-based, tab sis kuj tseem ceeb thiab cov khoom tseem ceeb hauv kev tsim kho yav tom ntej.
Lub Sijhawm Post: Feb-17-2025