Tam sim no uas muaj ntau thiab ntau dua ntau dua rau hydroxypropyl carboxymethyl cellulose thiab sai txiav txim siab tsis zoo, yuav ua li cas yooj yim dua thiab sai txiav txim siab tsis zoo, yuav ua li cas nrawm qhov zoo thiab sai tau txiav txim siab tsis zoo, yuav ua li cas nrawm qhov tsis zoo, yuav txiav txim siab yooj yim thiab sai sai tau txiav txim siab tsis zoo, yuav ua li cas yooj yim sai sai thiab nrawm nrawm ntawm cov teeb meem cellulropyl tau dhau los ua qhov teeb meem tseem ceeb! Yog li yuav ua li cas thiaj li txiav txim siab qhov zoo ntawm hydroxyprropythylcellulose? Thawj qhov uas saib yog qhov dawb ntawm hydroxyprropyl cellulose; Txawm hais tias qhov dawb tsis tuaj yeem txiav txim siab seb HPMC tsim nyog rau siv, qee cov neeg lag luam tsis muaj zog yuav ntxiv cov tshuaj ntxuav hniav dawb thaum ua, uas yuav cuam tshuam nws qhov zoo. Tab sis feem ntau hais lus, feem ntau ntawm cov kws kho cellulose zoo heev muaj zoo dua dawb huv.
Thib ob, nws nyob ntawm lub felleness ntawm hydroxyprropylulose: qhov me me ntawm hydroxynethyl cellulose hechpmc yog kwv yees li 100 mesh. Feem ntau ntawm HPMC yog 60-80 mesh. Feem ntau, cov softer lub methyl cellulose, qhov zoo dua cov dispersion.
Qhov kev pom tseeb ntawm cellulose ether hauv kev daws teeb meem: muab HPMC rau hauv kev daws teeb meem colloidal, ntau dua qhov kev pom tseeb, txo cov tshuaj tsis meej.
Thaum cov khoom lag luam ua kom sov, nws gels lossis pas dej thiab ces yaj. Nws yog hydrophobic thiab soluble. Qhob yog qhov tseem ceeb koom tes thiab demulsifying raw khoom rau cov dej-resistant putty hmoov. Lub hauv paus ntsiab lus ntawm cov dej tsis yog raws li nram no: Thaum cov hmoov av rov qab nrog cov hmoov av emulsion tsis sib xyaw, thiab cov kua txiv hmab tawg paj tawg rau hauv cov cement slurry. Tom qab cov cement ntsib dej, cov hydration cov tshuaj tiv thaiv pib, thiab CA (Oh) 2 kev daws teeb meem mus txog surmation thiab muaju yog precipitated. Nyob rau tib lub sijhawm, ettringite muaju thiab calcium silicate hydrate cov tshuaj tsw qab, raws li cov tshuaj pleev cov txiv hmab txiv ntoo uas tsis muaj zog ntxiv, thiab cov yas ua kom maj mam Sau rau hauv voids ntawm inorganic cov ntaub ntawv xws li MAAs, thiab tsim cov txheej ntim ntim ntsaws rau saum npoo ntawm cov cement gel. , vim kev txo qis ntawm cov dej noo qhuav, ntim cov khoom sib xyaw nrog cov maas pastej thiab ua cov hmoov nplej zom zaws thiab lwm cov hmoov nplej ua ke yog glued rau ib leeg.
Lub Sijhawm Post: Tsib Hlis-11-2023