Cellulose ether tuaj yeem txhim kho kev ua haujlwm ntawm cov khib nyiab ntub dej, thiab yog ib qho tseem ceeb ntxiv uas cuam tshuam rau kev tsim kho ntawm mortar. Tsim nyog xaiv ntawm cellulose ethers ntawm ntau yam, txawv viscosities, txawv particle loj, txawv degrees ntawm viscosity thiab ntxiv cov nyiaj yuav muaj txiaj ntsig zoo rau kev txhim kho kev ua haujlwm ntawm cov hmoov qhuav mortar.
Kuj tseem muaj kev sib raug zoo ntawm kev sib xws ntawm cov cement paste thiab ntau npaum li cas ntawm cellulose ether. Cellulose ether tuaj yeem ua kom cov viscosity ntawm mortar zoo heev. Qhov ntau npaum li cas, qhov pom tseeb dua cov nyhuv. High-viscosity cellulose ether aqueous tov muaj siab thixotropy, uas kuj yog ib tug tseem ceeb yam ntxwv ntawm cellulose ether.
Cov nyhuv thickening nyob ntawm qhov degree ntawm polymerization ntawm cellulose ether, kua concentration, shear npaum li cas, kub thiab lwm yam mob. Cov cuab yeej gelling ntawm cov tshuaj yog tshwj xeeb rau alkyl cellulose thiab nws cov derivatives hloov. Cov khoom gelation muaj feem xyuam rau qib ntawm kev hloov pauv, tshuaj concentration thiab additives. Rau hydroxyalkyl hloov derivatives, cov khoom gel kuj muaj feem xyuam nrog kev hloov kho qib ntawm hydroxyalkyl. 10% -15% cov tshuaj tuaj yeem npaj tau rau qis-viscosity MC thiab HPMC, 5%-10% tov tuaj yeem npaj rau nruab nrab-viscosity MC thiab HPMC, thiab 2%-3% tov tsuas yog npaj rau high-viscosity MC. thiab HPMC. Feem ntau cov viscosity kev faib tawm ntawm cellulose ether kuj tau muab qhab nia los ntawm 1% -2% tov.
High-molecular-yuag cellulose ether muaj cov thickening efficiency. Polymers nrog sib txawv molecular luj muaj sib txawv viscosities nyob rau hauv tib lub concentration daws. Qib siab. Lub hom phiaj viscosity tsuas tuaj yeem ua tiav los ntawm kev ntxiv ib qho loj ntawm qhov hnyav molecular cellulose ether. Nws viscosity muaj me ntsis nyob ntawm tus nqi shear, thiab lub siab viscosity ncav cuag lub hom phiaj viscosity, thiab qhov yuav tsum tau ntxiv tus nqi yog me me, thiab viscosity nyob ntawm qhov thickening efficiency. Yog li ntawd, kom ua tiav ib qho kev sib xws, qee qhov ntawm cellulose ether (kev sib xyaw ntawm cov tshuaj) thiab cov tshuaj viscosity yuav tsum tau lav. Cov gel kub ntawm cov tshuaj kuj txo qis linearly nrog qhov nce ntawm cov concentration ntawm cov tshuaj, thiab gels ntawm chav tsev kub tom qab ncav cuag ib tug tej yam concentration. Lub gelling concentration ntawm HPMC yog qhov siab ntawm chav tsev kub.
Post lub sij hawm: Mar-08-2023