Ilungiselelwe kanjani i-methyl hydroxyethyl cellulose?

Ingemuva nokubuka konke

I-Cellulose Ether iyinto esetshenziswa kakhulu yamakhemikhali e-polymer enziwe nge-polymer cellulose yemvelo ekwelashweni kwamakhemikhali. Ngemuva kokwenziwa kwe-cellulose nitrate kanye ne-cellulose acetate ngekhulu le-19, osokhemisi basungule uchungechunge lwe-cellulose derivatives of amaningi ama-celluLose asher, kanti amasimu amasha atholakele ngokuqhubekayo, ehilela imikhakha eminingi yezimboni. Imikhiqizo ye-Cellulose ether efana ne-sodium carboxyyllllls cellulose (CMC), i-ethyl cellulose (EC), i-hpdroxypropyl cellulose (HPPC) kanye nezinye izimbumbulu ze-mettyl kanye nezinye izimbotshana glutamate "futhi wasetshenziswa kabanzi ekubizeni uwoyela, ukwakhiwa, ukumboza, ukudla, umuthi namakhemikhali nsuku zonke.

I-Hydroxyyethyl methyl cellulose (MHPC) iyimpuphu yephunga elingenamzimba, engenambitha, engeyona into enobuthi engachithwa emanzini abandayo ukwakha ikhambi elibonakalayo le-viscous. Inezici zokuqina, ukubopha, ukusabalalisa, ukusabalalisa, amafilimu, ukumisa, ukumisa ama-adsorbing, ukugcinwa komhlaba, ukugcina umswakama nokuvikela umswakama nokuvikela i-colloid. Ngenxa yomsebenzi osebenzayo wokusebenza kwesisombululo samanzi, ungasetshenziswa njenge-ejenti evikelayo e-emulsifier kanye ne-dispersant. I-Hydroxyyethyl Methylcellulose ikhambi elinamanzi amahle i-hydrophility enhle futhi i-ejenti yokugcinwa kwamanzi efanelekile. Ngoba i-hydroxyyethyllylyl iqukethe amaqembu ama-hydroxyethyl, inekhono elihle lokulwa ne-turew, ukuqina okuhle kokuzikhekisa kanye nokuphikiswa kombumba ngesikhathi sokugcina isikhathi eside.

IHydroxyYethyl Methylcellulose (Hemc) ilungiselelwe ukwethula ubufakazi be-Ethylene oxide (MS 0.3 ~ 0.4) ku-methylcellulose (MC), kanye nokumelana nosawoti kungcono kunalokho kwama-polmesmers angafakwanga. Ukushisa kwe-gelation kwe-methylcellulose kuphakeme kakhulu kunalokho kwe-MC.

Ukwakheka

Ubuso

Izici eziyinhloko ze-hydroxyyethyl methylcellulose (hemc) yilezi:

1. I-Solubity: incibilika emanzini kanye nezinye izixazululo ze-organic. I-Hemc ingachithwa emanzini abandayo. Ukuhlushwa kwayo okuphezulu kunqunywa kuphela ngokubonakala. I-Solubolity iyahlukahluka nge-viscosity. Ukwehlisa ukubonakala, kukhudlwana ukubola.

2

I-3. Umsebenzi ongaphezulu

I-4 gel ye-Thermal: Lapho ikhambi lamanzi lemikhiqizo ye-hemc lifudunyezwa emazingeni okushisa athile, liba yi-opaque, ama-gels, futhi lapho kuqhubeka lipholile, kusolwa ngokuqhubekayo kuncipha ngabo, kumisa izivikelo, ama-colloids, ama-emulsifers njll.

I-5.

I-6. Ukumelana Nensimu: I-Hemc inokumelana ne-versew enhle kanye nokuqina okuhle kwentokozo ngesikhathi sokugcina isikhathi eside.

7. Ukuqina kwe-PH: Ukubonakala kwesisombululo esinamanzi semikhiqizo ye-hemc akuthinteki kahle nge-acid noma i-alkali, futhi inani le-PH lizinzile ngaphakathi kwebanga le-3.0 kuya ku-11.0.

Isicelo

I-Hydroxyyethyl methylcellulose ingasetshenziswa njenge-ejenti evikelayo yokuvikela, i-emulsifier kanye nokuhlakazeka ngenxa yomsebenzi wayo osebenzayo esikhaleni samanzi. Izibonelo zayo zohlelo lokusebenza zimi ngalendlela elandelayo:

1. Umphumela we-hydroxyyethyll methylcellulose ekusebenzeni kosimende. IHydroxYethyl Methylcellulose iyimpuphu ye-White engenamzimba engenamqondo, engenambitha, engeyona into enobuthi engachithwa emanzini abandayo ukwakha isixazululo esibonakalayo se-viscous. Inezici zokuqina, ukubopha, ukusabalalisa, ukusabalalisa, amafilimu, ukumisa, ukumisa ama-adsorbing, ukugcinwa komhlaba, ukugcina umswakama nokuvikela umswakama nokuvikela i-colloid. Njengoba ikhambi elinamanzi linomsebenzi osebenzayo we-surfaces, lingasetshenziswa njenge-ejenti evikelayo ye-colloidal, emulsifier kanye ne-dispersant. I-Hydroxyyethyl Methylcellulose ikhambi elinamanzi amahle i-hydrophility enhle futhi i-ejenti yokugcinwa kwamanzi efanelekile.

2. Upende wokuthola usizo oluguquguqukayo lulungisiwe, olwenziwe ngezinto ezilandelwayo ezivuthiwe ezingxenyeni ezithile ngesisindo: 150-200 g wamanzi abonakalayo; I-60-70 g ye-acrylic emsulwa acrylion; I-550-650 g ye-calcium esindayo; I-70-90 g ye-talcum powder; Isisekelo se-cellulose acaloiful tuli turmate 30- 40g; Isixazululo se-Lignocellulose esinamanzi 10-20g; Usizo lweFilm-wakha 4-6g; I-Antiseptic kanye ne-Fungicide 1.5-2.5g; I-Dispersant 1.8-2.2G; umenzeli we-wetting 1.8-2.2g; 3.5-4.5g; Ethylene glycol 9-11g; Isixazululo se-hydroxyyethyl methylcellose senziwa ngokuncibilika 2-4% hydroxyethyll methylcellulose emanzini; Isixazululo seLignokellulose Aquod senziwa nge-1-3% Lignocellulose yenziwa ngokuncibilika emanzini.

Amalungiselelo

Indlela yokulungiselela ye-hydroxyethyl methyl cellulose, indlela lelo lukotini olucwengiwe lusetshenziswa njengento eluhlaza, futhi i-ethylene oxide isetshenziswa njenge-ejenti yokusheshisa i-methyl cellulose. Izingxenye zesisindo zezinto zokusetshenziswa zokulungiselela i-hydroxyyethyll methylcellulose kanjena: Izingxenye ezingama-700-800 ze-toluene ne-20-80 izingxenye ze-solium hydroxide, izingxenye ezingama-80-8-90 ze-solvent, izingxenye ezingama-80-90 ze-methyl chloride, izingxenye ze-16-19 ze-glacial i-acetic acid; Izinyathelo ezithile yilezi:

Isinyathelo sokuqala, eKettele yokuphendula, engeza ingxube ye-toluene ne-isopropanol, amanzi, ne-sodium hydroxide, ukushisa kuze kube ngu-60-80 ° C, gcina ukufudumala imizuzu engama-20 ukuya kwengama-40;

The second step, alkalization: cool the above materials to 30-50°C, add refined cotton, spray the toluene and isopropanol mixture solvent, vacuumize to 0.006Mpa, fill nitrogen for 3 replacements, and carry out after the replacement Alkalinization, the alkalization conditions are: the alkalization time is 2 hours, and the alkalization temperature is 30°C to 50°C;

Isinyathelo sesithathu, ukuphuma kwe-alkalization sekuphothuliwe, i-reactorization ikhishwe ku-0.05-0.07MPA, ne-ethylele oxide kanye ne-methyl chloride yengezwa imizuzu engama-30-50; isigaba sokuqala sokuthezeka: 40-60 ° C, 1.0-2.0 amahora, ingcindezi ilawulwa phakathi kuka-0.15 no-0.3mpa; Isigaba sesibili sokuthezeka: 60 ~ 90 ℃, amahora angama-2.0 ~ ama-2,5, ingcindezi ilawulwa phakathi kuka-0.4 no-0.8MPA;

Isinyathelo sesine, ukungathathi hlangothi: Faka i-glacial acetic acetic acid kusengaphambili ku-kettle yezulu, ucindezele ukufudumala ku-75-80 ° C ukuthola i-102 ° C, i-PH VALUE itholakale ibe ngu-6 ngehora lesi-8, i-deselventization iphothuliwe; Ithangi le-decolventization ligcwele amanzi ompompi aphathwa yidivaysi ephindayo ye-osmosis ku-90 ° C kuye ku-100 ° C kuya ku-100 ° C;

Isinyathelo sesihlanu, ukugeza izingxenye: Izinto ezisetshenziselwa isinyathelo sesine zifakwe kwi-centrifuge centrug

Isinyathelo sesithupha, ukomisa okwenziwe nge-centrifugal: okokugeza okuhlanjiwe kudluliselwa esomisi ngesikulufo esivundlile se-centrifuge, futhi impahla yomiswa ngo-150-170 ° C, futhi impahla eyomile ichobozekile futhi ihlanganiswe.

Uma kuqhathaniswa nobuchwepheshe obukhona be-cellulose ether ether etherger, ukusungulwa kwamanje kusebenzisa i-ethylene oxide njenge-ejenti yokuthezeka ukulungiselela i-hydroxyethyll methyl cellulose, enomqondo omuhle mbamba ngenxa yamaqembu ama-hydroxyethyl. Inokuqina okuhle kokuzikhekisa kanye nokuphikiswa kombumba ngesikhathi sokugcina isikhathi eside. Ingasetshenziswa esikhundleni sezinye izithambiso ze-cellulose.