Cua-entraining nyhuv ntawm cellulose ether

Cellulose ethers yog hluavtaws polymers ua los ntawm ntuj cellulose thiab tshuaj hloov kho. Cellulose ether yog derivative ntawm natural cellulose. Tsis zoo li cov khoom siv hluavtaws, cellulose ether ntau lawm yog ua raws li cellulose, cov khoom siv yooj yim tshaj plaws, cov khoom siv ntuj tsim. Vim yog qhov tshwj xeeb ntawm cov qauv cellulose, cellulose nws tus kheej tsis muaj peev xwm ua rau cov tshuaj etherizing. Txawm li cas los xij, tom qab kev kho cov tshuaj solubilizers, lub zog hydrogen bonds ntawm thiab nyob rau hauv cov saw hlau molecular raug rhuav tshem, thiab hydroxyl pab pawg ua haujlwm raug tso tawm rau hauv alkali cellulose nrog lub peev xwm los teb, thiab tom qab cov tshuaj tiv thaiv ntawm tus neeg sawv cev etherizing ib pab pawg OH hloov dua siab tshiab. mus rau hauv ib pawg LOSSIS kom tau cellulose ether.

Cellulose ethers muaj qhov pom tseeb ntawm huab cua nkag rau ntawm cov khoom sib xyaw cementitious tshiab. Cellulose ethers muaj ob qho tib si hydrophilic (hydroxyl, ether) thiab hydrophobic (methyl, qabzib nplhaib) pab pawg thiab yog surfactants nrog nto ua haujlwm thiab yog li muaj huab cua nkag mus. Cov huab cua-entraining nyhuv ntawm cellulose ether yuav tsim cov nyhuv "pob", uas tuaj yeem txhim kho kev ua haujlwm ntawm cov khoom tshiab, xws li nce cov yas thiab smoothness ntawm mortar thaum ua haujlwm, uas muaj txiaj ntsig zoo rau kev sib kis ntawm mortar; nws kuj tseem yuav txhim kho cov txiaj ntsig ntawm mortar thiab txo tus nqi ntawm mortar ntau lawm; Txawm li cas los xij, nws yuav ua rau kom cov porosity ntawm cov khoom tawv tawv thiab txo nws lub zog thiab elastic modulus, thiab lwm yam.

Raws li ib tug surfactant, cellulose ether kuj muaj ib tug ntub dej los yog lubricating nyhuv ntawm cov cement hais, uas ua ke nrog nws cov huab cua-entraining nyhuv tsub kom lub fluidity ntawm cementitious cov ntaub ntawv, tab sis nws thickening nyhuv txo lub fluidity, thiab cov nyhuv ntawm cellulose ether ntawm fluidity Cov ntaub ntawv cementitious yog kev sib xyaw ua ke ntawm plasticizing thiab thickening teebmeem. Feem ntau hais lus, thaum tus nqi ntawm cellulose ether tsawg heev, nws tsuas yog qhia cov nyhuv ntawm plasticization los yog dej txo; Thaum tus nqi siab, cov nyhuv thickening ntawm cellulose ether nce sai, thiab nws cov huab cua-entraining nyhuv nyhav saturate, yog li nws qhia cov thickening nyhuv los yog ua rau kom cov dej yuav tsum tau.