methyl hydroxyethyl cellulose e lokisoa joang?

Background le Overview

Cellulose ether ke sesebelisoa sa lik'hemik'hale se sebelisoang haholo sa polymer se entsoeng ka selulose ea tlhaho ea polymer ka kalafo ea lik'hemik'hale.Kamora ho etsoa ha cellulose nitrate le cellulose acetate lekholong la bo19 la lilemo, litsebi tsa k'hemistri li thehile letoto la li-cellulose tse nkiloeng ho li-cellulose ethers tse ngata, 'me masimo a macha a ts'ebeliso a 'nile a sibolloa khafetsa, a kenyelletsang mafapha a mangata a indasteri.Lihlahisoa tsa cellulose ether tse kang sodium carboxymethyl cellulose (CMC), ethyl cellulose (EC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), methyl hydroxyethyl cellulose (MHEC) le methyl hydroxypropyl cellulose (MHPC) le tse ling tsa cellulose ethers li tsejoa e le cellulose ethers. "industrial monosodium glutamate" 'me e sebelisitsoe haholo ho cheka oli, ho haha, ho roala, lijo, meriana le lik'hemik'hale tsa letsatsi le letsatsi.

Hydroxyethyl methyl cellulose (MHPC) ke phofo e tšoeu e se nang monko, e sa latsoeheng, e se nang chefo e ka qhibilihang metsing a batang ho etsa tharollo e hlakileng ea viscous.E na le litšoaneleho tsa ho teteana, ho tlama, ho qhalakanya, emulsifying, filimi-forming, suspending, adsorbing, gelling, surface active, ho boloka mongobo le ho sireletsa colloid.Ka lebaka la likarolo tse sebetsang tsa tharollo ea metsi, e ka sebelisoa e le moemeli oa tšireletso ea colloidal, emulsifier le dispersant.Hydroxyethyl methylcellulose aqueous solution e na le hydrophilicity e ntle mme ke sesebelisoa se sebetsang sa ho boloka metsi.Hobane hydroxyethyl methylcellulose e na le lihlopha tsa hydroxyethyl, e na le bokhoni bo botle ba ho thibela hlobo, botsitso bo botle ba viscosity le ho hanyetsa hlobo nakong ea polokelo ea nako e telele.

Hydroxyethyl methylcellulose (HEMC) e lokiselitsoe ka ho hlahisa li-substituents tsa ethylene oxide (MS 0.3 ~ 0.4) ho methylcellulose (MC), 'me ho hanyetsa ha eona letsoai ho molemo ho feta ho li-polymers tse sa fetoloang.Mocheso oa mocheso oa methylcellulose o boetse o phahame ho feta oa MC.

Sebopeho

Sebopeho

Litšobotsi tsa mantlha tsa hydroxyethyl methylcellulose (HEMC) ke:

1. Ho qhibiliha: Ho qhibiliha ka metsing le lihlapolli tse ling tsa tlhaho.HEMC e ka qhibiliha ka metsing a batang.Boemo ba eona bo phahameng ka ho fetisisa bo khethoa feela ke viscosity.Sollubility e fapana ho ea ka viscosity.The viscosity e ka tlaase, e kholoanyane ea ho qhibiliha.

2. Ho hanyetsa letsoai: Lihlahisoa tsa HEMC ha li na ionic cellulose ethers 'me ha li polyelectrolyte, kahoo li batla li tsitsitse ka tharollo ea metsi ha letsoai la tšepe kapa li-electrolyte tse phelang li le teng, empa ho eketsoa ho feteletseng ha electrolyte ho ka baka gelation le pula.

3. Mosebetsi oa holim'a metsi: Ka lebaka la ts'ebetso e sebetsang ea holim'a metsi a metsi, e ka sebelisoa e le moemeli oa tšireletso ea colloidal, emulsifier le dispersant.

4. Thermal gel: Ha tharollo ea metsi ea lihlahisoa tsa HEMC e futhumetse mocheso o itseng, e fetoha opaque, gel, le precipitates, empa ha e ntse e pholile, e khutlela boemong ba pele ba tharollo, le mocheso oo gel ena e leng ho oona. le pula e etsahala haholo-holo Ho itšetlehile ka bona lubricant, suspending aids, protective colloids, emulsifiers joalo-joalo.

5. Metabolic inertness le monko o fokolang le monko o monate: HEMC e sebelisoa haholo lijong le meriana hobane e ke ke ea sebelisoa 'me e na le monko o fokolang le monko o monate.

6. Ho hanyetsa hlobo: HEMC e na le khanyetso e ntle ea hlobo le botsitso bo botle ba viscosity nakong ea polokelo ea nako e telele.

7. PH botsitso: The viscosity ea tharollo ea metsi ea lihlahisoa tsa HEMC ha e amehe ka thata ke acid kapa alkali, 'me boleng ba pH bo batla bo tsitsitse ka har'a mefuta ea 3.0 ho ea ho 11.0.

Kopo

Hydroxyethyl methylcellulose e ka sebelisoa e le moemeli oa tšireletso ea colloidal, emulsifier le dispersant ka lebaka la ts'ebetso ea eona e sebetsang ka holim'a metsi ka tharollo ea metsi.Mehlala ea tšebeliso ea eona ke e latelang:

1. Phello ea hydroxyethyl methylcellulose mosebetsing oa samente.Hydroxyethyl methylcellulose ke phofo e tšoeu e sa nkheng, e sa latsoeheng, e se nang chefo e ka qhalloang metsing a batang ho etsa tharollo e hlakileng ea viscous.E na le litšoaneleho tsa ho teteana, ho tlama, ho qhalakanya, emulsifying, filimi-forming, suspending, adsorbing, gelling, surface active, ho boloka mongobo le ho sireletsa colloid.Kaha tharollo ea metsi e na le ts'ebetso e sebetsang ea holim'a metsi, e ka sebelisoa e le moemeli oa tšireletso ea colloidal, emulsifier le dispersant.Hydroxyethyl methylcellulose aqueous solution e na le hydrophilicity e ntle mme ke sesebelisoa se sebetsang sa ho boloka metsi.

2. Pente ea liphallelo e feto-fetohang haholo e lokiselitsoe, e entsoeng ka lisebelisoa tse latelang tse tala likarolong ka boima ba 'mele: 150-200 g ea metsi a deionized;60-70 g ea emulsion e hloekileng ea acrylic;550-650 g ea k'halsiamo e boima;70-90 g ea phofo ea talcum;Base cellulose aqueous tharollo 30-40g;tharollo ea metsi a lignocellulose 10-20g;thuso ea ho etsa lifilimi 4-6g;antiseptic le fungicide 1.5-2.5g;dispersant 1.8-2.2g;moemeli oa metsi 1.8-2.2g;3.5-4.5g;Ethylene glycol 9-11g;Tharollo ea metsi a hydroxyethyl methylcellulose e entsoe ka ho qhibiliha 2-4% hydroxyethyl methylcellulose metsing;Tharollo ea metsi a lignocellulose e entsoe ka 1-3% Lignocellulose e entsoe ka ho qhibiliha ka metsing.

Tokisetso

Mokhoa oa ho lokisa oa hydroxyethyl methyl cellulose, mokhoa ke hore k'hothone e hloekisitsoeng e sebelisoa e le lisebelisoa tse tala, 'me ethylene oxide e sebelisoa e le etherification agent ho lokisa hydroxyethyl methyl cellulose.Likarolo tsa boima ba lisebelisoa tse tala bakeng sa ho lokisa hydroxyethyl methylcellulose ke tse latelang: likarolo tse 700-800 tsa toluene le isopropanol motsoako e le solvent, likarolo tse 30-40 tsa metsi, likarolo tse 70-80 tsa sodium hydroxide, likarolo tse 80-85 tsa k'hothone e hloekisitsoeng, lesale. 20-28 likarolo tsa oxy ethane, 80-90 likarolo tsa methyl chloride, 16-19 likarolo tsa glacial acetic acid;mehato e khethehileng ke:

Mohato oa pele, ka kettle e arabelang, eketsa toluene le motsoako oa isopropanol, metsi, le sodium hydroxide, mocheso ho fihlela ho 60-80 ° C, u futhumale metsotso e 20-40;

Mohato oa bobeli, alkalization: pholisa lisebelisoa tse kaholimo ho 30-50 ° C, eketsa k'hothone e hloekisitsoeng, fafatsa toluene le isopropanol motsoako oa motsoako, vacuumize ho 0.006Mpa, tlatsa naetrojene bakeng sa tse ling tse 3, 'me u e etse ka mor'a ho khutlisa Alkalinization, alkalization. maemo ke: nako ea alkalization ke lihora tse 2, 'me mocheso oa alkalization ke 30 ° C ho 50 ° C;

Mohato oa boraro, etherification: ka mor'a hore alkalization e phethoe, mochine oa motlakase o tlosoa ho 0.05-0.07MPa, 'me ethylene oxide le methyl chloride li eketsoa ka metsotso e 30-50;mohato oa pele oa etherification: 40-60 ° C, 1.0-2.0 Lihora, khatello e laoloa pakeng tsa 0.15 le 0.3Mpa;mohato oa bobeli oa etherification: 60～90℃, 2.0～2.5 lihora, khatello e laoloa pakeng tsa 0.4 le 0.8Mpa;

Mohato oa bone, ho se nke lehlakore: eketsa glacial acetic acid esale pele ho kettle ea pula, tobetsa ka har'a lintho tse etherified bakeng sa neutralization, phahamisa mocheso ho 75-80 ° C bakeng sa pula, mocheso o nyolohela ho 102 ° C, le pH. boleng bo lemohuoa hore ke 6 Ka hora ea 8, desolventization e phethiloe;tanka ea desolventization e tletse metsi a pompo a tšoaroang ke sesebelisoa sa reverse osmosis ho 90 ° C ho isa ho 100 ° C;

Mohato oa bohlano, ho hlatsoa centrifugal: thepa ea mohato oa bone ke centrifuged ka centrifuge screw centrifuge, 'me thepa e arohaneng e fetisetsoa tanka ea ho hlatsoa e tletseng metsi a chesang esale pele bakeng sa ho hlatsoa thepa;

Mohato oa botšelela, ho omisoa ha centrifugal: thepa e hlatsoitsoeng e fetisetsoa ka har'a se omisitsoeng ka sekontiri se otlolohileng, 'me thepa e omisitsoe ka 150-170 ° C,' me thepa e omisitsoeng e siloa ebe e kenngoa.

Ha ho bapisoa le theknoloji e teng ea tlhahiso ea cellulose ether, moqapi oa hona joale o sebelisa ethylene oxide e le etherification agent ho lokisa hydroxyethyl methyl cellulose, e nang le khanyetso e ntle ea hlobo ka lebaka la ho ba le lihlopha tsa hydroxyethyl.E na le botsitso bo botle ba viscosity le ho hanyetsa hlobo nakong ea polokelo ea nako e telele.E ka sebelisoa sebakeng sa ethers tse ling tsa cellulose.