Yuav txiav txim siab qhov zoo ntawm hydroxypropyl methyl cellulose

Tam sim nohydroxypropyl carboxymethyl celluloseKev muag khoom lag luam ntau dua thiab ntau dua, tus nqi tsis sib npaug, yuav ua li cas kom sai sai tshem tawm qhov zoo ntawm hydroxypropyl methyl cellulose tau dhau los ua teeb meem tseem ceeb! Yog li yuav ua li cas txiav txim siab qhov zoo ntawm hydroxypropyl methylcellulose? Thawj qhov yuav tsum saib yog qhov dawb ntawm hydroxypropyl cellulose; Txawm hais tias qhov dawb tsis tuaj yeem meej meej seb HPMC puas haum rau daim ntawv thov, tab sis thaum lub sijhawm ua tiav kuj muaj qee cov chaw tsim khoom tsis zoo yuav ntxiv tus neeg sawv cev dawb, yuav ua rau nws tsis zoo. Tab sis feem ntau hais lus, feem ntau ntawm cov cellulose ether zoo heev yog qhov dawb zoo dua.

Qhov thib ob, kom pom qhov zoo ntawm hydroxypropyl methyl cellulose: hydroxypropyl carboxymethyl cellulose qhov loj me ntawm 80-100 mesh, tsawg dua 120 mesh, hydroxyethyl cellulose HECHPMC txog 100 mesh. HPMC rau feem ntau 60-80 mesh, methyl cellulose dav dav softer, qhov zoo dua dispersion.

Kev daws teeb meem ntawm cellulose ether clarity:HPMCmuab tso rau hauv dej kom tsim cov kua colloid pob tshab, pom qhov siab dua qhov kev daws teeb meem, qhov siab dua qhov kev daws teeb meem, uas tsis yaj cov tshuaj lom neeg qis dua.

Thaum cov khoom raug cua sov, nws yuav gelatinized los yog pooled thiab tom qab ntawd rov yaj. Nws yog hydrophobic thiab soluble hauv dej. Concrete yog cov khoom siv tseem ceeb rau kev sib txuas thiab demulsification ntawm cov hmoov putty uas tsis muaj dej. Nws lub hauv paus ntsiab lus tsis muaj dej yog raws li nram no: Thaum ntxiv dej thiab do cov hmoov latex uas rov tawg thiab cement, cov hmoov latex rov qab mus rau daim ntawv emulsion qub, thiab cov khoom latex raug sib npaug rau hauv cov cement paste. Tom qab cement ntsib dej, qhov kev ua hydration pib, thiab Ca (OH) 2 kua mus txog saturation thiab precipitates crystals, thiab tib lub sijhawm, ettringite crystals thiab calcium silicate hydrate colloids raug tsim. Cov khoom latex raug tso rau ntawm cov gel thiab cov khoom cement tsis muaj dej. Nrog rau kev nce qib ntawm qhov kev ua hydration, cov khoom hydration nce ntxiv, thiab cov khoom latex maj mam sib sau ua ke hauv qhov khoob ntawm cov khoom inorganic xws li cement, thiab tsim ib txheej sib sau ua ke ze ntawm qhov chaw ntawm cement gel. Vim yog qhov maj mam txo qis ntawm cov dej qhuav, Cov khoom me me uas tau ntim rov qab rau hauv cov gels thiab voids condense los ua ib zaj duab xis txuas ntxiv, tsim cov sib xyaw ntawm cov cement paste interpenetrating matrix, thiab khi cov cement paste nrog lwm cov hmoov sib xyaw.