Hauv kev tsim cov ntaub ntawv hauv tsev, tshwj xeeb tshaj yog cov tshuaj pleev cov hmoov av,Cellulose etherUa lub luag haujlwm tseem ceeb, tshwj xeeb tshaj yog hauv kev tsim cov cug cug (megifiFified cug), nws yog ib qho tseem ceeb. Lub luag haujlwm tseem ceeb ntawm cov dej-soluble cellulose ether hauv cug cug yog feem ntau nws muaj peev xwm ua tau dej zoo. Cov dej khaws cov nyhuv ntawm cellulose nyob ntawm cov txheej txheem dej, cov dej phib tawj, cov dej phib tawj, thiab lub sijhawm teeb tsa lub sijhawm teeb tsa.
Ntau Masonry thiab plastering mortars tsis tuav dej kom zoo, thiab dej thiab slurry yuav cais tom qab ob peb feeb ntawm sawv ntsug. Dej khaws cia yog ib qho kev ua tau tseem ceeb ntawm methyl cellulose ether, tshwj xeeb yog cov cheeb tsam sib xyaw nrog ntau qhov kub thiab txias, xyuam xim rau. Yam uas cuam tshuam rau cov nyhuv retentive ntawm cov kab laum hmoov kom qhuav, cov ntau ntawm cov hais, thiab ntsuas kub ntawm kev siv ib puag ncig.
Dej khaws cia ntawmCellulose etherNws tus kheej los ntawm solubility thiab lub cev qhuav dej ntawm cellulose ether nws tus kheej. Raws li peb txhua tus paub, txawm hais tias lub cellulose molecular saw muaj ntau ntawm hydratle hel pawg, vim hais tias lub cellulose qauv muaj qhov siab ntawm crystallinity. Cov hydration muaj peev xwm ntawm pawg hydroxyl ib leeg yog tsis txaus los npog qhov muaj zog hydrogen bonds thiab van der waals rog ntawm molecules. Yog li ntawd, nws tsuas yog swells tab sis tsis yaj hauv dej. Thaum tus hloov pauv tau rau hauv cov molecular chart, tsis tsuas yog cov kev sib tw hydrogen puas tsuaj yog rhuav tshem vim kev sib tw ntawm cov kev sib tw ntawm cov saw hlau. Cov loj dua cov neeg hloov pauv, qhov kev ncua deb ntawm cov lwg me me. Qhov ntau dua qhov deb. Qhov ntau dua cov txiaj ntsig ntawm kev rhuav tshem hydrogen bonds, lub cellulose bonded dej-soluble tom qab lub cellulose daws teeb meem siab. Thaum qhov kub nce, cov hydration ntawm cov polymer muaj zog tsis muaj zog, thiab cov dej ntawm txoj saw hlau tau tsav tawm. Thaum lub cev qhuav dej ua tau txaus, cov lwg me me pib sib sau ua ke, ua ib qho cuab yeej cuab tam sim no thiab tais diav.
Feem ntau hais lus, ntau dua cov viscosity, qhov zoo dua cov dej khaws cov nyhuv khaws cia. Txawm li cas los xij, qhov ntau dua cov viscosity thiab ntau dua cov molecular hnyav, qhov txo qis hauv nws solubility yuav muaj kev tsis zoo rau lub zog thiab kev tsim kho ntawm lub tshuaj khib. Qhov siab tshaj lub viscosity, qhov pom ntau ntxiv rau cov nyhuv tuab rau ntawm lub tshuaj khib, tab sis nws tsis ncaj ncaj ncaj. Qhov siab tshaj lub viscosity, ntau ntau ntau lub cug cug cug yuav ua, uas yog, thaum lub sijhawm tsim, nws yog manifested raws li straper thiab siab adhesion rau lub substrate. Tab sis nws tsis muaj txiaj ntsig zoo rau kev nce cov txheej txheem lub zog ntawm lub txiv ntoo qhuav nws tus kheej. Thaum kev tsim kho, kev ua haujlwm tsis zoo yog tsis pom tseeb. Ntawm qhov tsis sib xws, qee qhov nruab nrab thiab qis viscosity tab sis hloov methylNeeg muaj neeg ua haujlwmMuaj kev ua tau zoo heev nyob rau hauv kev txhim kho lub zog ntawm lub zog ntawm cov tshuaj khib ntub.
Lub Sijhawm Post: Apr-25-2024