Kugwiritsa ntchito ndi kukonzekera kwa hydroxyethyl methyl cellulose HEMC

Hydroxyethyl methyl cellulose HEMCingagwiritsidwe ntchito ngati choteteza cha colloid, emulsifier ndi dispersant chifukwa cha ntchito yake yogwira ntchito pamwamba pa madzi. Chitsanzo cha momwe imagwiritsidwira ntchito ndi ichi: Mphamvu ya hydroxyethyl methyl cellulose pa makhalidwe a simenti. Hydroxyethyl methylcellulose ndi ufa woyera wopanda fungo, wopanda kukoma, wopanda poizoni womwe umasungunuka m'madzi ozizira kuti upange yankho lomveka bwino komanso lokhuthala. Ili ndi makhalidwe monga kukhuthala, kumangirira, kufalitsa, kusakaniza, kupanga filimu, kuyimitsa, kuyamwa, gelling, kugwira ntchito pamwamba, kusunga chinyezi ndi kuteteza ma colloid. Chifukwa cha ntchito yogwira ntchito pamwamba pa yankho la madzi, ingagwiritsidwe ntchito ngati choteteza cha colloid, emulsifier ndi dispersant. Hydroxyethyl methyl cellulose aqueous solution ili ndi hydrophilicity yabwino ndipo ndi yothandiza kwambiri kusunga madzi.
konzekerani
Njira yopangira hydroxyethyl methyl cellulose, njira iyi imaphatikizapo kugwiritsa ntchito thonje loyengedwa ngati zinthu zopangira ndi ethylene oxide ngati chothandizira kupumitsa.hydroxyethyl methyl celluloseZipangizo zopangira hydroxyethyl methyl cellulose zimakonzedwa m'zigawo motsatira kulemera kwake: magawo 700-800 a chisakanizo cha toluene ndi isopropanol ngati chosungunulira, magawo 30-40 a madzi, magawo 70-80 a sodium hydroxide, magawo 80-85 a thonje loyengedwa, magawo 20-28 a oxyethane, magawo 80-90 a methyl chloride, ndi magawo 16-19 a glacial acetic acid; njira zenizeni ndi izi:

Gawo loyamba, mu reactor, onjezerani toluene ndi isopropanol osakaniza, madzi, ndi sodium hydroxide, kutentha kufika 60 ~ 80 ℃, kuikidwa mu incubation kwa mphindi 20 ~ 40;

Gawo lachiwiri, kusakaniza zinthu zomwe zili pamwambapa: kuziziritsa zinthu zomwe zili pamwambapa kufika pa 30 ~ 50 ℃, onjezerani thonje loyengedwa bwino, thirani chisakanizo cha toluene ndi isopropanol ndi solvent, tulutsani ku 0.006Mpa, mudzaze nayitrogeni katatu, ndipo pitirizani kugwiritsa ntchito alkali mutasintha. Mikhalidwe ya alkali ndi iyi: nthawi ya alkali ndi maola awiri, ndipo kutentha kwa alkali ndi 30 ° C mpaka 50 ° C;

Gawo lachitatu, etherification: alkaliization yatha, reactor imachotsedwa ku 0.05 ~ 0.07MPa, ethylene oxide ndi methyl chloride zimawonjezedwa, ndikusungidwa kwa mphindi 30 ~ 50; gawo loyamba la etherification: 40 ~ 60℃, 1.0 ~ 2.0 ola, kuthamanga kumayendetsedwa pakati pa 0.150.3Mpa; gawo lachiwiri la etherification: 60 ~ 90℃, 2.0 ~ 2.5 maola, kuthamanga kumayendetsedwa pakati pa 0.40.8Mpa;

Gawo lachinayi, kuletsa: onjezani acetic acid yoyezedwa mu metered mu ketulo ya mvula, kanikizani mu etherified material kuti muletse mvula, tenthetsani 75 ~ 80 ℃ kuti mvula ipitirire, kutentha kumakwera kufika pa 102 ℃, ndipo pH yodziwika ndi 68. Madzi akatha, thanki ya mvula imadzazidwa ndi madzi apampopi okonzedwa ndi chipangizo chosinthira osmosis pa 90 ℃ ~ 100 ℃;

Gawo lachisanu, kutsuka pogwiritsa ntchito centrifugal: chinthu chomwe chili mu gawo lachinayi chimayikidwa ndi centrifuge yopingasa, ndipo chinthucho chimasamutsidwa ku ketulo yotsukira yodzazidwa ndi madzi otentha pasadakhale, ndipo chinthucho chimatsukidwa;

Gawo lachisanu ndi chimodzi, kuumitsa pogwiritsa ntchito centrifugal: zinthu zotsukidwa zimanyamulidwa kupita ku choumitsira pogwiritsa ntchito screw centrifuge yopingasa, zinthuzo zimaumitsidwa pa 150-170°C, ndipo zinthu zoumazo zimaphwanyidwa ndikupakidwa.

Poyerekeza ndi zomwe zilipo kaleether ya cellulosePogwiritsa ntchito ukadaulo wopanga, njira yatsopanoyi imagwiritsa ntchito ethylene oxide ngati chinthu chotenthetsera kuti ipange hydroxyethyl methyl cellulose, ndipo ili ndi mphamvu yabwino yolimbana ndi chimfine chifukwa ili ndi gulu la hydroxyethyl, Kukhazikika kwabwino kwa viscosity komanso kukana chimfine panthawi yosungidwa kwa nthawi yayitali. Ingagwiritsidwe ntchito m'malo mwa ma ether ena a cellulose.