Tam sim no muaj ntau thiab ntau lub khw rau hydroxypropyl carboxymethyl cellulose thiab tus nqi tsis sib npaug, yuav ua li cas kom yooj yim thiab sai sai txiav txim siab qhov zoo ntawm hydroxypropyl carboxymethyl cellulose tau dhau los ua qhov teeb meem tseem ceeb! Yog li yuav ua li cas txiav txim siab qhov zoo ntawm hydroxypropyl methylcellulose? Thawj qhov uas yuav tsum saib yog qhov dawb ntawm hydroxypropyl cellulose; txawm hais tias qhov dawb tsis tuaj yeem txiav txim siab seb HPMC puas tsim nyog rau kev siv, qee cov chaw tsim khoom tsis muaj kev ntseeg yuav ntxiv tus neeg sawv cev dawb thaum lub sijhawm ua tiav, uas yuav cuam tshuam rau nws qhov zoo. Tab sis feem ntau hais lus, feem ntau ntawm cov cellulose ethers zoo heev muaj qhov dawb zoo dua.
Qhov thib ob, nws nyob ntawm qhov zoo ntawm hydroxypropyl methylcellulose: qhov loj me ntawm hydroxypropyl carboxymethyl cellulose yog 80-100 mesh, tsawg dua 120 mesh, thiab hydroxyethyl cellulose HECHPMC yog li 100 mesh. Feem ntau ntawm hpmc yog 60-80 mesh. Feem ntau, qhov softer lub methyl cellulose, qhov zoo dua qhov dispersion.
Qhov meej ntawm cellulose ether hauv cov tshuaj: muab HPMC rau hauv dej kom tsim cov tshuaj colloidal pob tshab, qhov siab dua qhov meej, qhov siab dua qhov meej, qhov qis dua cov tshuaj tsis yaj.
Thaum cov khoom raug sov, nws ua gels lossis pas dej thiab tom qab ntawd yaj. Nws yog hydrophobic thiab soluble. Pob zeb yog qhov tseem ceeb ntawm kev sib txuas thiab demulsifying raw khoom rau cov hmoov putty uas tsis muaj dej. Lub hauv paus ntsiab lus ntawm kev tiv thaiv dej yog raws li nram no: thaum cov hmoov latex uas rov tawg thiab cement sib xyaw nrog dej, cov hmoov latex yuav txuas ntxiv rov qab mus rau daim ntawv emulsion qub, thiab cov khoom latex tawg sib npaug rau hauv cov cement slurry. Tom qab cov cement ntsib dej, qhov kev cuam tshuam hydration pib, thiab Ca (OH) 2 kua mus txog saturation thiab cov siv lead ua precipitated. Tib lub sijhawm, ettringite siv lead ua thiab calcium silicate hydrate colloids raug tsim, thiab cov khoom latex raug tso rau ntawm gel thiab cov khoom cement tsis muaj dej, thaum qhov kev cuam tshuam hydration txuas ntxiv mus, cov khoom hydration txuas ntxiv nce, thiab cov khoom latex maj mam sib sau ua ke hauv cov khoom inorganic xws li cement, thiab tsim ib txheej ntim ntom ntom ntawm qhov chaw ntawm cov cement gel. , vim yog qhov maj mam txo qis ntawm cov dej noo qhuav, cov khoom sib xyaw ua ke hauv cov gel thiab cov voids coagulate los ua ib zaj duab xis txuas ntxiv, tsim cov sib xyaw nrog cov matrix interpenetrating ntawm cov cement paste, thiab ua rau cov cement paste thiab lwm cov hmoov Cov aggregates tau nplaum rau ib leeg.
Lub sijhawm tshaj tawm: Tsib Hlis-11-2023