Kugwiritsa ntchito ndi kukonza hydroxyethyl methyl cellulose HEMC

Hydroxyethyl methyl cellulose HEMCangagwiritsidwe ntchito ngati colloid zoteteza wothandizila, emulsifier ndi dispersant chifukwa pamwamba yogwira ntchito mu amadzimadzi njira. 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 kuti akonzekere.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 thonje loyengedwa, 20-28 mbali za 80-28 za oxyethane, methyl chloride 9, methyl chloride 9, 80-85 magawo a oxyethane ndi methyl chloride. 16-19 magawo 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 30 ~ 50 ℃, onjezani thonje woyengedwa, kupoperani osakaniza toluene ndi isopropanol ndi zosungunulira, tulukani ku 0.006Mpa, lembani nayitrogeni m'malo 3, ndikuchita zamchere mutatha kusintha.

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 4, neutralization: onjezani metered glacial acetic acid pasadakhale kwa mpweya ketulo, kanikizani mu etherified zinthu kuti neutralization, kutentha 75 ℃ 80 ℃ kuchita mvula, kutentha kukwera kwa 102 ℃, ndi kudziwa pH mtengo ndi 68 Pamene mpweya kutenthedwa ndi mpweya wodzazidwa ndi mpweya wodzazidwa ndi thanki wodzazidwa ndi mpweya wodzazidwa ndi madzi tanki kutsirizidwa. chipangizo 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 zomwe zilipocellulose etherkupanga luso, kutulukira panopa utenga ethylene okusayidi monga etherifying wothandizila kukonzekera hydroxyethyl methyl mapadi, ndipo ali ndi luso odana ndi mildew chifukwa lili hydroxyethyl gulu, Good mamasukidwe kukhazikika bata ndi mildew kukana pa nthawi yosungirako yaitali. Itha kugwiritsidwa ntchito m'malo mwa ma cellulose ethers.