Hydroxypropyl methylcellulose (HPMC) yog cellulose ether muab los ntawm ntuj cellulose thiab yog dav siv nyob rau hauv kev tsim kho kev lag luam vim nws cov yam ntxwv tshwj xeeb thiab versatility. Hauv cov ntaub ntawv cementitious, HPMC ua ntau yam haujlwm, suav nrog kev txhim kho kev ua haujlwm, tuav dej, adhesion, thiab kav ntev.
1. Txhim kho kev ua haujlwm:
Kev ua haujlwm tau zoo yog qhov tseem ceeb ntawm cov pob zeb thiab mortars, cuam tshuam rau lawv qhov chaw, sib sau ua ke thiab ua tiav cov txheej txheem. HPMC additives ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov txheej txheem los ntawm kev txo cov dej kom zoo thaum tswj xyuas qhov xav tau sib xws. Lub peev xwm khaws dej siab ntawm HPMC txuas ntxiv ua haujlwm tau zoo rau kev tso chaw zoo dua thiab ua tiav ntawm cov pob zeb thiab mortar sib tov. Tsis tas li ntawd, HPMC tau hloov kho cov ntaub ntawv cementitious tuaj yeem txhim kho cov khoom siv rheological, ua kom yooj yim dua rau kev siv dej thiab nchuav cov haujlwm hauv kev tsim kho.
2. Kev tuav dej:
Kev tuav dej yog qhov tseem ceeb rau kev ua kom muaj dej txaus ntawm cov ntaub ntawv cementitious, tshwj xeeb tshaj yog nyob rau hauv cov huab cua kub los yog qhuav qhov chaw uas tuaj yeem poob dej sai sai. HPMC additives ua raws li cov dej tuav cov neeg ua haujlwm zoo, tiv thaiv kev ziab ntxov ntxov ntawm cov pob zeb thiab cov khoom sib tov. HPMC slows dej evaporation los ntawm kev tsim ib zaj duab xis nyias nyob ib ncig ntawm cov cement hais, yog li ncua cov txheej txheem hydration thiab txhawb kev txhim kho lub zog zoo. Qhov no tshwj xeeb tshaj yog muaj txiaj ntsig zoo nyob rau hauv qhov kub thiab txias ib puag ncig qis, qhov uas tswj cov av noo txaus tuaj yeem nyuaj.
3. Txhim kho adhesion:
Kev sib raug zoo ntawm cov khoom siv cementitious thiab cov substrate yog qhov tseem ceeb rau kev ua haujlwm thiab kev ua haujlwm ntev ntawm lub tsev xws li cov nplais nplaum, plasters thiab plasters. HPMC additives txhim kho adhesion los ntawm kev txhim kho kev sib raug zoo ntawm cov khoom nto thiab cov nplaum los yog txheej. Cov khoom ua yeeb yaj kiab ntawm HPMC tsim ib qho kev thaiv uas txhim kho kev sib cuag ntawm cov nplaum thiab cov substrate, uas ua rau muaj kev sib txuas zoo dua. Tsis tas li ntawd, HPMC pab txo qhov tshwm sim ntawm cov kab nrib pleb shrinkage, yog li txhim kho tag nrho cov kav ntev ntawm qhov sib txuas.
4. Txhim kho durability:
Durability yog qhov tseem ceeb hauv kev tsim kho, tshwj xeeb tshaj yog nyob rau hauv cov qauv uas raug rau ib puag ncig hnyav los yog kev ntxhov siab ntawm kev siv tshuab. HPMC additives pab txhim kho lub durability ntawm cementitious cov ntaub ntawv los ntawm kev ua kom lawv tsis kam mus rau yam xws li khov-thaw cycles, tshuaj tua kab mob thiab puas. Los ntawm kev txhim kho kev ua haujlwm thiab txo cov dej permeability, HPMC pab txo qis cov khoom tsis zoo rau hauv pob zeb thiab mortar, yog li txuas ntxiv lawv lub neej kev pab cuam. Tsis tas li ntawd, HPMC-hloov cov ntaub ntawv nthuav tawm txhim kho flexural thiab compressive zog, yog li txhim kho cov qauv kev ua tau zoo thiab kav ntev.
5. Cov txiaj ntsig ntawm kev txhim kho kom ruaj khov:
Ntxiv rau lawv cov kev ua tau zoo, HPMC additives coj cov txiaj ntsig tseem ceeb hauv kev tsim kho. Raws li cov khoom siv biodegradable thiab rov ua dua tshiab tau los ntawm cellulose, HPMC pab txo qhov cuam tshuam ib puag ncig ntawm kev tsim kho. Los ntawm kev ua kom zoo ntawm cov khoom siv cementitious, HPMC tuaj yeem siv cov ntsiab lus qis qis hauv cov cement, yog li txo cov pa roj carbon emissions cuam tshuam nrog cov cement ntau lawm. Tsis tas li ntawd, HPMC tau ntxiv dag zog rau cov mortars thiab pob zeb pab txhim kho lub zog ua haujlwm ntawm lub tsev los ntawm kev txhim kho thermal rwb thaiv tsev thiab txo qhov xav tau ntawm cov khoom cua sov thiab cua txias.
6. Kev Pom Zoo:
Kev thov rau cov khoom siv hauv tsev ruaj khov thiab kev coj ua txuas ntxiv mus ntxiv, tsav kev tsim kho tshiab hauv kev txhim kho cov khoom zoo ib puag ncig xws li HPMC. Lub neej yav tom ntej ntawm HPMC hauv kev tsim kho kev lag luam yog ci ntsa iab, thiab kev tshawb fawb tam sim no tau tsom mus rau kev txhim kho nws cov kev ua tau zoo thiab nthuav dav nws cov ntawv thov. Tsis tas li ntawd, kev nce qib hauv cov txheej txheem tsim khoom thiab kev tsim cov thev naus laus zis yuav tsum ua kom zoo dua qhov kev ua tau zoo thiab tus nqi-zoo ntawm HPMC additives, ua rau lawv txoj kev siv dav hauv kev tsim kho thoob plaws ntiaj teb yuav muaj ntau ntxiv.
Hydroxypropyl methylcellulose (HPMC) additives ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov khoom thiab kev ua haujlwm ntawm cov ntaub ntawv cementitious hauv kev tsim kho. Los ntawm kev txhim kho kev tsim kho thiab kev tuav dej kom txhim kho adhesion thiab durability, HPMC muaj ntau yam txiaj ntsig uas pab txhim kho qhov zoo, kev ruaj khov thiab ntev ntawm ib puag ncig tsim. Raws li kev tsim kho kev lag luam txuas ntxiv tseem ceeb rau kev ruaj khov thiab kev tsim kho tshiab, HPMC xav tias yuav txuas ntxiv yog cov khoom tseem ceeb hauv kev tsim cov khoom siv ua haujlwm siab, ib puag ncig zoo.
Post lub sij hawm: Feb-27-2024