Kugwiritsa ntchito ndi kukonza hydroxyethyl methyl cellulose HEMC

Hydroxyethyl methyl cellulose HEMC angagwiritsidwe ntchito ngati colloid zoteteza agent, emulsifier ndi dispersant chifukwa pamwamba yogwira ntchito mu njira amadzimadzi. Chitsanzo cha ntchito yake ndi motere: Zotsatira za hydroxyethyl methyl cellulose pa katundu wa simenti. Hydroxyethyl methylcellulose ndi ufa woyera wopanda fungo, wosakoma, wopanda poizoni womwe umasungunuka m'madzi ozizira kuti ukhale wowoneka bwino, wowoneka bwino. Lili ndi mphamvu zowonjezera, kumanga, kubalalika, emulsifying, kupanga mafilimu, kuyimitsa, kutsatsa, gelling, pamwamba, kusunga chinyezi ndi kuteteza colloids. Chifukwa cha ntchito yogwira ntchito ya njira yamadzimadzi, imatha kugwiritsidwa ntchito ngati colloid protective agent, emulsifier ndi dispersant. Hydroxyethyl methyl cellulose aqueous solution ili ndi hydrophilicity yabwino ndipo ndi yosunga bwino madzi.

konzekerani
Njira yopangira hydroxyethyl methyl cellulose, njirayo imaphatikizapo kugwiritsa ntchito thonje woyengedwa ngati zopangira ndi ethylene oxide monga etherifying agent pokonzekera hydroxyethyl methyl cellulose. Zopangira pokonzekera hydroxyethyl methyl cellulose zimakonzedwa m'magawo ndi kulemera kwake: magawo 700-800 a toluene ndi isopropanol monga zosungunulira, magawo 30-40 a madzi, magawo 70-80 a sodium hydroxide, magawo 80-85 a madzi. thonje woyengedwa, magawo 20-28 a oxyethane, 80-90 magawo a methyl chloride, ndi magawo 16-19 a glacial acetic acid; masitepe enieni ndi awa:

Gawo loyamba, mu riyakitala, kuwonjezera toluene ndi isopropanol osakaniza, madzi, ndi sodium hydroxide, kukhala kutentha kwa 60～80 ℃, kukhala chofungatira 20～40 mphindi;

Gawo lachiwiri, alkalization: kuziziritsa zida pamwambapa ku 30 ~ 50 ℃, onjezani thonje woyengedwa, kupoperani chisakanizo cha toluene ndi isopropanol ndi zosungunulira, tulukani ku 0.006Mpa, lembani nayitrogeni m'malo 3, ndikuchita zamchere mutasinthana ndi alkalization. mikhalidwe ili motere: nthawi ya alkalization ndi maola 2, ndipo kutentha kwa alkalization ndi 30 ° C mpaka 50 ° C;

Gawo lachitatu, etherification: alkalization yatha, riyakitala imasamutsidwa kupita ku 0.05 ~ 0.07MPa, ethylene oxide ndi methyl chloride amawonjezeredwa, ndikusungidwa kwa mphindi 30 ~ 50; Gawo loyamba la etherification: 40～60℃, 1.0～2.0 ora, kupanikizika kumayendetsedwa pakati pa 0.150.3Mpa; Gawo lachiwiri la etherification: 60～90℃, 2.0～2.5 maola, kupanikizika kumayendetsedwa pakati pa 0.40.8Mpa;

Gawo la 4, neutralization: onjezani metered glacial acetic acid pasadakhale ku ketulo yamvula, kanikizani muzinthu za etherified kuti muchepetse, tenthetsani 75°80 ℃ kuti muyambe mvula, kutentha kumakwera mpaka 102 ℃, ndi kuzindikira pH 68 Mvula ikamalizidwa, thanki yamvula imadzazidwa ndi madzi apampopi opangidwa ndi chipangizo cha reverse osmosis pa 90℃～100℃;

Gawo lachisanu, kutsuka kwa centrifugal: zinthu zomwe zili mu sitepe yachinayi ndi centrifuged ndi chopingasa chopingasa wononga centrifuge, ndipo zinthu zolekanitsidwa zimasamutsidwa ku ketulo yotsuka yodzazidwa ndi madzi otentha pasadakhale, ndipo zinthuzo zimatsukidwa;

Gawo lachisanu ndi chimodzi, kuyanika kwa centrifugal: zinthu zotsukidwa zimatumizidwa mu chowumitsira kudzera pa centrifuge yopingasa, zinthuzo zimauma pa 150-170 ° C, ndipo zouma zimaphwanyidwa ndikupakidwa.

Poyerekeza ndi luso kupanga mapadi etere kupanga, luso panopa utenga okusayidi ethylene monga etherifying wothandizila kukonzekera hydroxyethyl methyl mapadi, ndipo ali ndi luso odana ndi mildew chifukwa lili hydroxyethyl gulu, Good mamasukidwe kukhazikika bata ndi kukana mildew pa nthawi yosungirako yaitali. Itha kugwiritsidwa ntchito m'malo mwa ma cellulose ethers ena.