Hydroxyethyl methyl cellulose HEMC le ṣee lo bi colloid aabo oluranlowo, emulsifier ati dispersant nitori awọn oniwe-dada lọwọ iṣẹ ni olomi ojutu. Apeere ti ohun elo rẹ jẹ bi atẹle: Ipa ti hydroxyethyl methyl cellulose lori awọn ohun-ini ti simenti. Hydroxyethyl methylcellulose jẹ alaini oorun, adun, lulú funfun ti ko ni majele ti o tuka ninu omi tutu lati ṣe agbekalẹ ti o han gbangba, ojutu viscous. O ni o ni awọn ohun-ini ti nipọn, abuda, pipinka, emulsifying, film-forming, suspending, adsorbing, gelling, dada-lọwọ, idaduro ọrinrin ati idaabobo colloid. Nitori iṣẹ ṣiṣe dada ti ojutu olomi, o le ṣee lo bi oluranlowo aabo colloid, emulsifier ati dispersant. Hydroxyethyl methyl cellulose olomi ojutu ni hydrophilicity ti o dara ati pe o jẹ oluranlowo mimu omi ti o ga julọ.
murasilẹ
Ọna kan fun igbaradi hydroxyethyl methyl cellulose, ọna naa pẹlu lilo owu ti a ti tunṣe bi ohun elo aise ati ohun elo afẹfẹ ethylene gẹgẹbi oluranlowo etherifying lati ṣeto hydroxyethyl methyl cellulose. Awọn ohun elo aise fun igbaradi hydroxyethyl methyl cellulose ti pese sile ni awọn ẹya nipasẹ iwuwo: awọn ẹya 700-800 ti adalu toluene ati isopropanol bi epo, awọn ẹya 30-40 ti omi, awọn ẹya 70-80 ti iṣuu soda hydroxide, awọn ẹya 80-85. owu ti a ti mọ, awọn ẹya 20-28 ti oxyethane, awọn ẹya 80-90 ti methyl kiloraidi, ati awọn ẹya 16-19 ti glacial acetic acid; Awọn igbesẹ pataki ni:
Igbesẹ akọkọ, ninu riakito, ṣafikun toluene ati adalu isopropanol, omi, ati iṣuu soda hydroxide, jẹ ki o gbona si 60 ~ 80 ℃, jẹ idabobo fun iṣẹju 20-40;
Igbesẹ keji, alkalization: tutu awọn ohun elo ti o wa loke si 30 ~ 50 ℃, ṣafikun owu ti a ti tunṣe, fun sokiri adalu toluene ati isopropanol pẹlu epo, yọ kuro si 0.006Mpa, fọwọsi pẹlu nitrogen fun awọn iyipada 3, ati gbe alkali jade lẹhin rirọpo Alkalization awọn ipo jẹ bi atẹle: akoko alkalization jẹ wakati 2, ati iwọn otutu alkalization jẹ 30 ° C si 50 ° C;
Igbesẹ kẹta, etherification: alkalization ti pari, a ti yọ riakito si 0.05～0.07MPa, ethylene oxide ati methyl chloride ti wa ni afikun, ati tọju fun awọn iṣẹju 30-50; ipele akọkọ ti etherification: 40～60℃, 1.0～2.0 wakati, titẹ ti wa ni iṣakoso laarin 0.150.3Mpa; ipele keji ti etherification: 60～90℃, 2.0～2.5 wakati, titẹ ni iṣakoso laarin 0.40.8Mpa;
Igbesẹ 4th, didoju: ṣafikun metered glacial acetic acid ni ilosiwaju si kettle ojoriro, tẹ sinu ohun elo etherified fun yomi, ooru soke 75 ~ 80 ℃ lati ṣe ojoriro, iwọn otutu ga si 102 ℃, ati pe pH wiwa jẹ 68 Nigbati ojoriro ba ti pari, ojò ojoriro ti kun pẹlu omi tẹ ni kia kia mu nipasẹ ẹrọ osmosis yiyipada ni 90℃～100℃;
Igbesẹ karun, fifọ centrifugal: awọn ohun elo ti o wa ni ipele kẹrin ti wa ni centrifuged nipasẹ kan petele centrifuge skru centrifuge, ati awọn ti o ya awọn ohun elo ti wa ni ti o ti gbe si kan fifọ iwẹ kún pẹlu gbona omi ni ilosiwaju, ati awọn ohun elo ti wa ni fo;
Igbesẹ kẹfa, gbigbẹ centrifugal: ohun elo ti a fọ ni gbigbe sinu ẹrọ gbigbẹ nipasẹ centrifuge skru petele, ohun elo naa ti gbẹ ni 150-170 ° C, ati awọn ohun elo ti o gbẹ ti wa ni pọn ati akopọ.
Akawe pẹlu awọn ti wa tẹlẹ cellulose ether gbóògì ọna ẹrọ, awọn bayi kiikan adopts ethylene oxide bi awọn etherifying oluranlowo lati mura hydroxyethyl methyl cellulose, ati ki o ni o dara egboogi-imuwodu agbara nitori ti o ni hydroxyethyl ẹgbẹ, Ti o dara iki iduroṣinṣin ati imuwodu resistance nigba gun-igba ipamọ. Le ṣee lo dipo awọn ethers cellulose miiran.
Akoko ifiweranṣẹ: Oṣu Kẹsan-26-2022