Tam sim no muaj ntau thiab ntau lub khw rau hydroxypropyl carboxymethyl cellulose thiab cov nqi tsis sib xws, yuav ua li cas yooj yim thiab ceev txiav txim siab zoo ntawm hydroxypropyl carboxymethyl cellulose tau dhau los ua qhov teeb meem tseem ceeb! Yog li yuav ua li cas txiav txim qhov zoo ntawm hydroxypropyl methylcellulose? Thawj qhov yuav tsum tau 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 tuam txhab tsis raug cai yuav ntxiv cov tshuaj ntxuav hniav dawb thaum ua, uas yuav cuam tshuam rau nws qhov zoo. Tab sis feem ntau hais lus, feem ntau ntawm cov cellulose ethers zoo heev muaj qhov zoo dua whiteness.
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 methyl cellulose, qhov zoo dua qhov dispersion.
Lub clarity ntawm cellulose ether nyob rau hauv cov tshuaj: muab HPMC rau hauv dej los tsim ib tug pob tshab colloidal tov, qhov siab dua qhov clarity, siab dua qhov clarity, qhov qis dua cov insoluble tshuaj.
Thaum cov khoom yog sov, nws gels los yog pas dej ua ke thiab ces melts. Nws yog hydrophobic thiab soluble. Qhob yog qhov tseem ceeb sib txuas thiab demulsifying raw khoom rau dej-resistant putty hmoov. Lub hauv paus ntsiab lus ntawm kev tiv thaiv dej yog raws li nram no: thaum lub redispersible latex hmoov thiab cov cement tov nrog dej, cov latex hmoov yuav rov qab mus rau lub qub emulsion daim ntawv, thiab cov latex particles disperse tusyees rau hauv cov cement slurry. Tom qab cov cement ntsib dej, cov tshuaj tiv thaiv hydration pib, thiab cov tshuaj Ca (OH) 2 ncav cuag saturation thiab crystals yog precipitated. Nyob rau tib lub sijhawm, ettringite crystals thiab calcium silicate hydrate colloids yog tsim, thiab cov latex hais tau tso rau ntawm cov gel thiab cov cement uas tsis muaj dej, raws li cov tshuaj tiv thaiv hydration pib, cov khoom hydration txuas ntxiv mus, thiab cov latex hais maj mam. sib sau ua ke nyob rau hauv cov voids ntawm inorganic cov ntaub ntawv xws li cov cement, thiab tsim ib txheej densely ntim rau saum npoo ntawm cov cement gel. , vim tias maj mam txo qis ntawm cov dej qhuav qhuav, cov khoom sib txuas ntawm cov latex hauv cov gel thiab cov voids coagulate los ua ib zaj duab xis tas mus li, ua ib qho kev sib xyaw nrog cov sib xyaw ua ke ntawm cov cement paste, thiab ua cov cement paste thiab lwm cov hmoov sib tov. yog glued rau ib leeg.
Post lub sij hawm: May-11-2023