Selulose ether e na le phello efe linthong tse entsoeng ka samente?

1. Mocheso oa hydration

Ho ea ka lebelo la ho lokolloa ha mocheso oa hydration ha nako e ntse e ea, mokhoa oa hydration oa samente o atisa ho aroloa ka mekhahlelo e mehlano, e leng, nako ea pele ea hydration (0 ~ 15min), nako ea induction (15min ~ 4h), nako ea ho potlakisa le ho beha nako (4h ~ 8h), ho fokotseha le ho thatafatsa nako (8h ~ 24h), le nako ea ho fokotsa nako (1 ~ 24h).

Liphetho tsa liteko li bontša hore nakong ea pele ea ho kenngoa (ke hore, nako ea pele ea hydration), ha palo ea HEMC e le 0.1% ha e bapisoa le slurry ea samente e se nang letho, tlhōrō ea exothermic ea slurry e tsoetse pele 'me tlhōrō e eketseha haholo. Ha palo eaHEMCe eketseha ho ea Ha e ka holimo ho 0,3%, tlhōrō ea pele ea exothermic ea slurry e lieha, 'me boleng ba tlhōrō bo fokotseha butle-butle ka keketseho ea litaba tsa HEMC; Ho hlakile hore HEMC e tla lieha nako ea ho kenya letsoho le nako ea ho potlakisa ha slurry ea samente, 'me e kholoanyane litaba , nako e telele ea ho kenya letsoho, e khutlela morao nako ea ho potlakisa, le tlhōrō e nyenyane ea exothermic; phetoho ea cellulose ether content ha e na phello e totobetseng ka bolelele ba nako ea deceleration le nako ea botsitso ea slurry ea samente, joalokaha ho bontšitsoe setšoantšong sa 3 (a) Ho bontšoa hore cellulose ether e ka boela ea fokotsa mocheso oa hydration ea peista ea samente nakong ea lihora tse 72, empa ha mocheso oa hydration o le telele ho feta lihora tse 36, phello ea ether ea cellulose e na le phello e nyenyane ea mocheso oa cellulose. peista, joalo ka Setšoantšo sa 3(b).

Setšoantšo sa 3 Phapang ea mokhoa oa ho lokolla mocheso oa hydration oa pente ea samente e nang le litaba tse fapaneng tsa cellulose ether (HEMC)

2. Mthepa ea echanical:

Ka ho ithuta mefuta e 'meli ea li-cellulose ethers tse nang le li-viscosities tsa 60000Pa·s le 100000Pa·s, ho ile ha fumanoa hore matla a khatello ea seretse se fetotsoeng se kopantsoeng le methyl cellulose ether a fokotseha butle-butle ka keketseho ea litaba tsa eona. Matla a hatellang a seretse se fetotsoeng se kopantsoeng le 100000Pa · s viscosity hydroxypropyl methyl cellulose ether e eketseha pele ebe e fokotseha ka keketseho ea litaba tsa eona (joalo ka ha ho bonts'itsoe ho Setšoantšo sa 4). E bontša hore ho kenngoa ha methyl cellulose ether ho tla fokotsa haholo matla a khatello ea seretse sa samente. Ha chelete e le ngata, matla a tla fokola; ha viscosity e nyane, e na le tšusumetso e kholo ho lahleheloa ke matla a khatello ea seretse; hydroxypropyl methyl cellulose ether Ha litekanyetso li le ka tlase ho 0.1%, matla a khatello ea seretse a ka eketsoa ka nepo. Ha litekanyetso li feta 0.1%, matla a khatello ea seretse a tla fokotseha ka keketseho ea litekanyetso, kahoo litekanyetso li lokela ho laoloa ho 0.1%.

Fig.4 3d, 7d le 28d matla a ho hatella a MC1, MC2 le MC3 seretse sa samente se fetotsoeng

(Methyl cellulose ether, viscosity 60000Pa·S, eo hamorao e bitsoang MC1; methyl cellulose ether, viscosity 100000Pa·S, e bitsoang MC2; hydroxypropyl methylcellulose ether, viscosity 100000Pa·S, e bitsoang MC2).

3.Cnako e behiloeng:

Ka ho lekanya nako ea ho beha hydroxypropyl methylcellulose ether e nang le viscosity ea 100000Pa · ka litekanyetso tse fapaneng tsa peista ea samente, ho ile ha fumanoa hore ka ho eketseha ha tekanyo ea HPMC, nako ea pele ea ho beha le nako ea ho qetela ea seretse sa samente e ile ea lelefatsoa. Ha mahloriso a le 1%, nako ea pele ea ho beha e fihla metsotso ea 510, 'me nako ea ho qetela ea ho beha e fihla metsotso ea 850. Ha ho bapisoa le sampuli e se nang letho, nako ea pele ea ho beha nako e atolosoa ka metsotso ea 210, 'me nako ea ho qetela ea ho beha e atolosoa ka metsotso ea 470 (joalokaha ho bontšitsoe setšoantšong sa 5). Ho sa tsotellehe hore na ke HPMC e nang le viscosity ea 50000Pa s, 100000Pa s kapa 200000Pa s, e ka lieha ho beha samente, empa ha e bapisoa le li-ether tse tharo tsa cellulose, nako ea ho beha nako ea pele le nako ea ho qetela ea ho qetela e lelefalitsoe ka ho eketseha ha viscosity, joalokaha ho bontšitsoe Setšoantšong sa 6. Sena se bakoa ke hore cellulose ether e adsorbed holim'a likaroloana tsa samente, tse thibelang metsi ho kopana le likaroloana tsa samente, kahoo li lieha ho phalla ha samente. Ha viscosity ea cellulose ether e le kholoanyane, e ba motenya oa lera la adsorption holim'a likaroloana tsa samente, 'me phello ea ho lieha e bohlokoa le ho feta.

Fig.5 Phello ea litaba tsa cellulose ether mabapi le ho beha nako ea seretse

Fig.6 Phello ea li-viscosity tse fapaneng tsa HPMC nakong ea ho beha nako ea pente ea samente

(MC-5(50000Pa·s), MC-10(100000Pa·s) le MC-20(200000Pa·s))

Methyl cellulose ether le hydroxypropyl methyl cellulose ether e tla lelefatsa haholo nako ea ho beha samente slurry, e ka etsang bonnete ba hore slurry ea samente e na le nako e lekaneng le metsi bakeng sa karabelo ea hydration, le ho rarolla bothata ba matla a tlaase le mohato oa morao oa slurry ea samente ka mor'a ho thatafala. bothata ba ho petsoha.

4. Ho boloka metsi:

Phello ea li-cellulose ether content ho boloka metsi li ile tsa ithutoa. Ho fumanoa hore ka keketseho ea litaba tsa cellulose ether, tekanyo ea ho boloka metsi ea seretse e eketseha, 'me ha litaba tsa cellulose ether li feta 0.6%, tekanyo ea ho boloka metsi e atisa ho tsitsa. Leha ho le joalo, ha ho bapisoa mefuta e meraro ea li-cellulose ethers (HPMC e nang le viscosity ea 50000Pa s (MC-5), 100000Pa s (MC-10) le 200000Pa s (MC-20)), tšusumetso ea viscosity ho boloka metsi e fapane. Kamano lipakeng tsa sekhahla sa ho boloka metsi ke: MC-5.