Cov ntaub ntawv cement-based yog dav siv hauv kev tsim kho, txoj kev, txuas hniav, tunnels thiab lwm yam dej num. Vim lawv cov khoom siv raw ntau, tus nqi qis thiab kev tsim kho yooj yim, lawv tau dhau los ua cov ntaub ntawv tseem ceeb hauv tsev. Txawm li cas los xij, cov ntaub ntawv cement-based kuj ntsib qee qhov teeb meem hauv kev siv tswv yim, xws li tsis tshua muaj kev sib tsoo, dej tsis zoo thiab kev xav tau siab rau cov dej ntawm cov cement paste thaum tsim kho. Txhawm rau daws cov teeb meem no, cov kws tshawb fawb tau sim muab ntau yam khoom siv polymer rau hauv cov khoom siv cement los txhim kho lawv cov kev ua tau zoo.Hydroxypropyl methylcellulose (HPMC)Raws li cov khoom siv dej-soluble polymer feem ntau, tau siv dav los txhim kho ntau yam khoom ntawm cov khoom siv cement-based vim nws cov khoom zoo rheological, thickening nyhuv, dej tuav thiab dej tsis kam.
1. Cov khoom tseem ceeb ntawm hydroxypropyl methylcellulose
KimaCell®Hydroxypropyl methylcellulose yog cov khoom siv polymer uas tau los ntawm kev hloov kho tshuaj ntawm cov cellulose, nrog rau cov dej zoo solubility, thickening, dej tuav thiab siab stability. Nws tuaj yeem kho cov viscosity, fluidity thiab tiv thaiv kev sib cais ntawm cov khoom siv cement, thiab tseem muaj qee qhov huab cua permeability, tiv thaiv kev ua qias tuaj thiab tiv thaiv kev laus. HPMC feem ntau siv rau hauv cov khoom siv hauv tsev xws li mortar, cementitious cov ntaub ntawv, mortar qhuav, thiab coatings, thiab plays lub luag haujlwm tseem ceeb hauv kev kho cov khoom rheological ntawm cov ntaub ntawv cement.
2. Kev txhim kho cov khoom rheological ntawm cov khoom siv cement-based los ntawm hydroxypropyl methylcellulose
Cov khoom rheological ntawm cov ntaub ntawv cement-based yog qhov tseem ceeb rau kev tsim kho, tshwj xeeb tshaj yog nyob rau hauv cov txheej txheem ntawm kev siv, kev tsim kho, thiab txheej txheej. Cov khoom zoo rheological tuaj yeem txhim kho kev tsim kho thiab ua kom muaj kev tsim kho zoo. Qhov sib ntxiv ntawm HPMC tuaj yeem txhim kho cov kua dej ntawm cov khoom siv cement. Tshwj xeeb, HPMC nce viscosity ntawm cov cement paste, ua kom cov sib tov ruaj khov thiab txo qhov tshwm sim ntawm kev sib cais. Nyob rau hauv cov dej-cement piv tsis zoo, HPMC tuaj yeem txhim kho kev ua haujlwm ntawm cov pob zeb thiab mortar, ua rau lawv muaj cov dej ntws zoo dua, thiab tseem txo cov evaporation ntawm cov khoom thiab ua kom lub sijhawm tsim kho.
3. Kev txhim kho ntawm kev tawg tsis kam ntawm cov ntaub ntawv cement-based los ntawm HPMC
Cement-raws li cov ntaub ntawv muaj feem xyuam rau cov kab nrib pleb thaum lub sij hawm hardening txheej txheem, feem ntau yog vim muaj tej yam xws li ziab shrinkage, kub hloov, thiab lwm yam loads. Qhov sib ntxiv ntawm HPMC tuaj yeem txhim kho qhov tawg tsis kam ntawm cov khoom siv cement. Qhov no feem ntau yog vim cov dej tuav tau zoo thiab cov nyhuv thickening ntawm HPMC. Thaum HPMC ntxiv rau cov khoom siv cement, nws tuaj yeem txo cov evaporation ntawm cov dej thiab ua kom lub zog ceev ntawm cov cement paste, yog li txo qis qhov tawg ntawm cov dej ntau dhau. Tsis tas li ntawd, HPMC tuaj yeem txhim kho cov qauv sab hauv ntawm cov khoom siv cement, ua kom lawv cov tawv tawv thiab tawg tsis kam.
4. Txhim kho cov dej tsis kam thiab ua haujlwm ntev ntawm cov khoom siv cement
Cov dej tsis kam thiab ua haujlwm ntev ntawm cov ntaub ntawv cement-based yog ib qho tseem ceeb ntawm lawv daim ntawv thov hauv kev tsim kho. Raws li lub siab molecular polymer, HPMC tuaj yeem txhim kho cov dej tsis kam ntawm cov khoom siv cement. HPMC molecules muaj zog hydrophilicity thiab muaj peev xwm tsim ib tug ruaj khov hydration txheej nyob rau hauv cement paste kom txo tau dej nkag. Tib lub sijhawm, KimaCell®HPMC tseem tuaj yeem txhim kho microstructure ntawm cov ntaub ntawv cement-based, txo cov porosity, thiab yog li txhim kho cov khoom tiv thaiv permeability thiab dej tsis kam. Hauv qee qhov chaw tshwj xeeb, xws li qhov chaw ntub dej lossis kev sib cuag nrog dej mus ntev, kev siv HPMC tuaj yeem txhim kho qhov ua tau zoo ntawm cov khoom siv cement-based.
5. HPMC thickening nyhuv ntawm cov khoom siv cement
Cov nyhuv thickening ntawm HPMC ntawm cov ntaub ntawv cement-based yog ib qho tseem ceeb rau nws daim ntawv thov dav. Hauv cov cement paste, HPMC tuaj yeem tsim cov qauv kev sib txuas ntawm peb sab los ntawm kev hloov pauv ntawm nws cov qauv molecular, yog li ua kom cov viscosity ntawm cov muab tshuaj ntxiv. Cov nyhuv thickening no tuaj yeem tsis tsuas yog ua rau cov ntaub ntawv cement-raws li ruaj khov thaum lub sij hawm tsim kho thiab zam kev sib cais ntawm cov cement paste, tab sis kuj tseem txhim kho cov nyhuv txheej ntawm cov tshuaj txhuam thiab cov smoothness ntawm qhov kev tsim kho rau qee yam. Rau mortar thiab lwm cov ntaub ntawv cement-based, cov nyhuv thickening ntawm HPMC tuaj yeem txhim kho kev ua haujlwm thiab kev hloov pauv ntawm cov ntaub ntawv.
6. HPMC txhim kho kev ua tau zoo ntawm cov khoom siv cement
Cov nyhuv ntawmHPMCnyob rau hauv cov ntaub ntawv cement-based, tshwj xeeb tshaj yog cov nyhuv synergistic hauv fluidity, tawg tsis kam, dej tuav thiab dej tsis kam, tuaj yeem txhim kho tag nrho cov khoom siv cement-based. Piv txwv li, HPMC tuaj yeem ua kom cov dej ntws ntawm cov cement-based cov ntaub ntawv thaum txhim kho lawv cov kev sib tsoo thiab dej tsis kam nyob rau theem hardening tom qab kev tsim kho. Rau ntau hom cement-based cov ntaub ntawv, qhov sib ntxiv ntawm HPMC tuaj yeem kho lawv cov kev ua tau zoo raws li qhov xav tau los txhim kho kev ua haujlwm zoo thiab kev ua haujlwm ntev ntawm cov khoom siv cement.
Hydroxypropyl methylcellulose (HPMC), raws li cov khoom siv dej-soluble polymer, tuaj yeem txhim kho ntau yam khoom ntawm cov khoom siv cement, tshwj xeeb tshaj yog nyob rau hauv rheology, tawg tsis kam, dej tsis kam thiab thickening nyhuv. Nws qhov kev ua tau zoo heev ua rau HPMC tau siv dav hauv cov khoom siv hauv tsev, tshwj xeeb tshaj yog cov khoom siv cement. Nyob rau hauv lub neej yav tom ntej, nrog rau kev txhim kho tas mus li ntawm kev ua tau zoo ntawm cov khoom siv cement-based, daim ntawv thov muaj peev xwm ntawm KimaCell®HPMC thiab nws cov derivatives tseem yuav tsum tau tshawb nrhiav thiab tsim ntxiv.
Post lub sij hawm: Jan-27-2025