Cellulose ether HPMC nyob rau hauv cement mortar thiab gypsum raws li slurry, feem ntau ua lub luag haujlwm ntawm kev khaws cia dej thiab thickening, tuaj yeem txhim kho qhov adhesion thiab sag tsis kam ntawm slurry.
Qhov kub ntawm huab cua, qhov kub thiab cua ceev tuaj yeem cuam tshuam rau qhov dej evaporation ntawm cov dej hauv cov cement mortar thiab gypsum raws li cov khoom. Hauv ntau lub caij sib txawv, cov dej khaws cia ntawm slurry tuaj yeem hloov kho los ntawm kev nce lossis txo qhov ntau ntawm HPMC. Hauv kev tsim kho lub caij ntuj sov kub siab, txhawm rau kom ua tiav cov txiaj ntsig ntawm kev txuag dej, nws yog qhov tsim nyog los ntxiv cov khoom HPMC hauv qhov ntau txaus raws li cov mis. Txwv tsis pub, yuav muaj dej tsis txaus, txo lub zog, tawg, hollow nruas thiab shedding los ntawm kev qhuav sai dhau, thiab lwm yam teeb meem zoo. Thaum qhov kub txo qis, qhov ntau ntawm HPMC tuaj yeem maj mam txo qis, thiab tib yam dej khaws cia tuaj yeem ua tiav.
Muaj qee qhov sib txawv thiab yog vim li cas rau qhov cuam tshuam ntawm cov dej khaws cia ntawm cov khoom tib yam ntxiv HPMC. Cov khoom zoo heev HPMC series tuaj yeem daws tau qhov teeb meem ntawm kev khaws cia dej hauv qab qhov kub siab. Hauv lub caij kub siab, tshwj xeeb tshaj yog nyob rau hauv thaj chaw kub thiab qhuav thiab txheej nyias nyias ntawm sab hnub ci, xav tau HPMC zoo los txhim kho kev khaws cia dej ntawm slurry. HPMC zoo, nws cov pab pawg methoxy thiab hydroxypropyl raws li cov saw hlau molecular cellulose sib npaug faib, tuaj yeem txhim kho hydroxyl thiab ether daim ntawv cog lus ntawm cov pa oxygen thiab dej koom tes hydrogen daim ntawv cog lus muaj peev xwm, ua rau dej dawb rau hauv dej sib xyaw. Thiab zoo dispersed hauv slurry thiab qhwv tag nrho cov khoom khov, hydration reaction nrog cov ntaub ntawv inorganic cementing, thiab tsim ib txheej ntawm wetting zaj duab xis, dej hauv lub hauv paus maj mam tso tawm rau lub sijhawm ntev, yog li kom tswj tau qhov evaporation ntawm dej los ntawm huab cua kub siab, kom ua tiav kev khaws cia dej siab.
Cov dej khaws cia ntawm cov khoom HPMC feem ntau cuam tshuam los ntawm cov hauv qab no:
1. Qhov sib xws ntawm HPMC: Kev sib xyaw ua ke ntawm HPMC, methoxy, hydroxypropoxy sib xyaw ua ke, khaws dej tau zoo.
2 HPMC thermal gel kub: Kub gel muaj siab
kub thiab qhov ceev ceev ntawm kev khaws dej; txwv tsis pub, nws muaj qhov ceev ceev ntawm kev khaws dej tsawg.
3. Qhov viscosity ntawm HPMC: Thaum qhov viscosity ntawm HPMC nce ntxiv, qhov ceev ntawm kev khaws dej kuj nce ntxiv. Thaum lub
viscosity ncav cuag qee qib, qhov nce ntawm tus nqi khaws dej feem ntau maj mam.
4. Cov ntsiab lus HPMC: Qhov ntxiv HPMC ntau npaum li cas, qhov ceev ntawm kev khaws dej ntau dua thiab qhov zoo dua ntawm kev khaws dej. Hauv qhov ntau ntawm 0.25-0.6%, qhov ceev ntawm kev txuag dej nce sai nrog rau qhov nce ntawm qhov ntxiv. Thaum qhov ntxiv ntau ntxiv, qhov sib txawv ntawm kev nce ntawm qhov ceev ntawm kev txuag dej tau qeeb.
Lub sijhawm tshaj tawm: Lub Xya Hli-29-2022