Hydroxypropyl methylcellulose (HPMC) yog cov dej-soluble nonionic cellulose ether uas tau siv dav hauv cov khoom siv hauv tsev, tshwj xeeb tshaj yog cov khoom siv cement thiab txheej. Cov khoom tshwj xeeb ntawm HPMC ua rau nws ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov khoom siv hauv tsev.
1. Txhim kho cov dej tuav ntawm cov khoom siv cement
HPMC muaj cov khoom tuav dej zoo, uas yog qhov tseem ceeb tshwj xeeb hauv cov khoom siv cement. Kev tuav dej yog hais txog lub peev xwm ntawm cov khoom khaws cia dej thaum lub sij hawm hydration txheej txheem, uas yog ib qho tseem ceeb rau hardening thiab lub zog loj hlob ntawm cement-based cov ntaub ntawv. HPMC txo cov dej poob thiab xyuas kom meej tias cov cement particles muaj dej txaus los ntawm kev tsim cov yeeb yaj kiab nyias hauv cov cement paste, yog li txhim kho qhov ntom ntom thiab tawg tsis kam ntawm cov khoom. Cov khoom siv ua kom cov paas ua ke yog tiv taus kev yaig los ntawm ib puag ncig sab nraud, acid, alkali, thiab lwm yam, txuas ntxiv rau lub neej ntawm cov khoom.
2. Ua kom muaj zog ntawm cov khoom siv
HPMC tuaj yeem txhim kho kev sib raug zoo ntawm cov khoom siv cement thiab cov substrate. Qhov no yog vim hais tias HPMC ua raws li lub thickener thiab binder nyob rau hauv cov khoom, cia cov khoom kom zoo dua mus rau ntau qhov chaw. Txhim kho daim ntawv cog lus lub zog txhais tau hais tias cov khoom tsis tshua muaj peev xwm tev lossis poob tawm thaum ntsib nrog lwm lub zog, uas muaj txiaj ntsig zoo rau kev ruaj khov thiab ua haujlwm ntev ntawm lub tsev.
3. Txhim kho kev tsim kho ntawm cov khoom siv
Kev tsim kho kev ua haujlwm ntawm cov khoom siv hauv tsev ncaj qha cuam tshuam rau lawv qhov kawg durability. HPMC xyuas kom meej tias cov khoom siv tau yooj yim dua thaum tsim kho thiab txo cov kev tsim kho tsis xws li honeycomb voids thiab cov txheej tsis sib xws los ntawm kev txhim kho rheology thiab kev ua haujlwm ntawm cov khoom. Cov kev tsis zoo no yuav ua rau cov khoom muaj kev cuam tshuam rau kev yaig sab nraud thaum siv, thiab qhov sib ntxiv ntawm HPMC txo qhov kev pheej hmoo no.
4. Txhim kho qhov tawg tsis kam ntawm cov khoom siv
Cement-raws li cov ntaub ntawv yuav ntsws thaum lub sij hawm hardening txheej txheem, thiab cov kab nrib pleb yuav tshwm sim yog hais tias lub shrinkage kev nyuaj siab tshaj lub tensile lub zog ntawm cov khoom. Cov kab nrib pleb no tsis tsuas yog cuam tshuam rau cov tsos ntawm cov khoom, tab sis qhov tseem ceeb tshaj, lawv yuav dhau los ua txoj hauv kev rau dej, ntsev thiab lwm yam khoom tsis zoo nkag mus, yog li ua kom tsis muaj zog ntawm cov khoom siv. HPMC txo qhov tsim ntawm shrinkage tawg los ntawm kev txhim kho cov dej tuav ntawm cov khoom thiab ncua cov evaporation ntawm dej thaum lub sij hawm hardening txheej txheem. Tsis tas li ntawd, HPMC kuj tseem tuaj yeem txhim kho qhov tawv ntawm cov khoom, ua rau nws tsis tshua muaj kev tawg thaum muaj kev ntxhov siab.
5. Txhim kho cov khoom muaj peev xwm tiv thaiv lub voj voog khov-thaw
Hauv cov cheeb tsam txias, cov khoom siv hauv tsev yuav tsum tiv taus ntau lub voj voog khov-thaw, uas yog ib qho kev sim hnyav rau cov khoom siv. Thaum cov dej hauv cov khoom khov, nws yuav nthuav dav thiab ua kom muaj zog. Yog tias cov khoom tsis tuaj yeem tso tawm qhov siab no, nws yuav ua rau muaj kev puas tsuaj rau cov qauv sab hauv. HPMC txo qhov muaj peev xwm ntawm cov dej nkag mus rau hauv cov khoom los ntawm kev txhim kho qhov ceev thiab tawg tsis kam ntawm cov khoom, yog li txhim kho cov khoom muaj peev xwm tiv thaiv khov-thaw thiab txuas ntxiv nws lub neej kev pab cuam.
6. Txhim kho cov khoom siv tiv thaiv corrosion
Cov khoom siv hauv tsev feem ntau raug corrosive media xws li acids, alkalis, thiab ntsev. Cov tshuaj no yuav maj mam ua rau cov khoom siv sab hauv thiab ua rau nws lub zog tsis muaj zog. HPMC txo qhov kev nkag mus ntawm cov khoom tsis zoo no los ntawm kev tsim cov yeeb yaj kiab tiv thaiv, yog li txhim kho cov khoom tiv thaiv rau tshuaj lom neeg corrosion. Cov cuab yeej no yog qhov tseem ceeb tshwj xeeb hauv cov chaw ua dej hiav txwv lossis kev lag luam, vim tias cov tshuaj tiv thaiv corrosion hauv cov cheeb tsam no muaj zog thiab cov khoom siv yuav tsum muaj zog dua.
7. Txhim kho qhov hnav tsis kam ntawm cov khoom siv
Cov khoom siv hauv tsev yuav raug rau sab nraud quab yuam xws li kev sib txhuam thiab kev cuam tshuam thaum siv, ua rau lub ntsej muag hnav, uas tsis tsuas yog cuam tshuam rau lub ntsej muag, tab sis kuj tseem tuaj yeem nthuav tawm cov qauv sab hauv thiab ua rau muaj kev pheej hmoo ntawm kev yaig. HPMC txhim kho qhov hnav tsis kam ntawm cov ntaub ntawv los ntawm kev txhim kho lawv cov tawv tawv thiab adhesion, txo tus nqi ntawm qhov hnav, thiab yog li ua haujlwm tau zoo rau kev pab cuam lub neej ntawm cov ntaub ntawv.
8. Txhim kho qhov kub tsis kam ntawm cov ntaub ntawv
HPMC tseem tuaj yeem txhim kho cov cua sov ntawm cov ntaub ntawv, tshwj xeeb tshaj yog nyob rau hauv qhov kub thiab txias ib puag ncig, qhov chaw ua haujlwm ntawm cov ntaub ntawv zoo li deteriorate. Lub siab kub tsis kam ntawm HPMC tso cai rau cov khoom nyob ruaj khov nyob rau hauv qhov kub thiab txias ib puag ncig, txo kev tawg thiab tawg los ntawm thermal expansion. Qhov no yog ib qho tseem ceeb tshwj xeeb tshaj yog rau cov khoom siv hauv tsev nyob rau hauv qhov kub thiab txias los yog yuav tsum tau tiv taus qhov kub thiab txias.
HPMC txhim kho qhov ruaj khov ntawm cov khoom siv hauv tsev los ntawm kev txhim kho lawv cov dej tuav, kev sib txuas lub zog, tawg tsis kam, khov-thaw tsis kam, tshuaj tiv thaiv corrosion, hnav tsis kam, thiab kub tsis kam. Qhov no ua rau cov qauv tsim kom ruaj khov hauv ntau qhov chaw hnyav, txuas ntxiv lawv lub neej kev pabcuam, thiab txo cov nqi kho thiab kho. Yog li ntawd, daim ntawv thov ntawm HPMC nyob rau hauv cov khoom siv niaj hnub no tsis tsuas yog txhim kho cov khoom siv, tab sis kuj muab kev txhawb zog rau kev tsim kho kom ruaj khov.
Post lub sij hawm: Sep-05-2024