Phello ea ho teteana ha ether ea selulose

Li-ether tsa seluloseke sehlopha sa li-polymer tse feto-fetohang tse sebelisoang haholo liindastering tse fapaneng bakeng sa thepa ea tsona ea ho teteana. Ho qala ka selelekela sa li-ether tsa cellulose le thepa ea tsona ea sebopeho, pampiri ena e hlahlobisisa mekhoa e ka morao ho phello ea tsona ea ho teteana, e hlakisa hore na likamano le limolek'hule tsa metsi li lebisa joang ntlafatsong ea viscosity. Ho buisanoa ka mefuta e fapaneng ea li-ether tsa cellulose, ho kenyeletsoa methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, le carboxymethyl cellulose, e 'ngoe le e 'ngoe e nang le litšobotsi tse ikhethang tsa ho teteana. ts'ebeliso ea li-ether tsa cellulose liindastering tse kang kaho, meriana, lijo, litlolo le tlhokomelo ea botho, e totobatsa karolo ea tsona ea bohlokoa haholo ts'ebetsong ea tlhahiso ea lihlahisoa le tlhahiso. Qetellong, bohlokoa ba li-ether tsa cellulose mekhoeng ea indasteri ea sejoale-joale boa totobatsoa, ​​​​hammoho le litebello tsa nakong e tlang le tsoelo-pele e ka bang teng theknolojing ea ether ea cellulose.

Li-ether tsa cellulose li emela sehlopha sa li-polymer tse nkiloeng ho cellulose, biopolymer e fumanehang hohle maboteng a sele ea limela. Ka thepa e ikhethang ea physicochemical, li-ether tsa cellulose li sebelisoa haholo liindastering tse fapaneng, haholo-holo bakeng sa phello ea tsona ea ho teteana. Bokhoni ba li-ether tsa cellulose ba ho eketsa viscosity le ho ntlafatsa thepa ea rheological bo etsa hore li be tsa bohlokoa lits'ebetsong tse ngata ho tloha ho thepa ea kaho ho ea ho mekhoa ea meriana.

1. Thepa ea Sebopeho sa Cellulose Ethers

Pele o hlahloba phello ea ho teteana ha li-ether tsa cellulose, ho bohlokoa ho utloisisa litšobotsi tsa tsona tsa sebopeho. Li-ether tsa cellulose li hlahisoa ka phetoho ea lik'hemik'hale ea cellulose, haholo-holo e kenyelletsang liketso tsa etherification. Lihlopha tsa hydroxyl (-OH) tse teng mokokotlong oa cellulose li feta liketsong tsa phetolo le lihlopha tsa ether (-OR), moo R e emelang lintho tse fapaneng tse nkeloang sebaka. Phetolo ena e lebisa liphetohong sebopehong sa limolek'hule le thepa ea cellulose, e leng se fanang ka litšobotsi tse ikhethang ho li-ether tsa cellulose.

Liphetoho tsa sebopeho sa li-ether tsa cellulose li susumetsa ho qhibiliha ha tsona, boitšoaro ba rheological, le thepa ea ho teteana. Tekanyo ea phetolo (DS), e bolelang palo e tloaelehileng ea lihlopha tsa hydroxyl tse nkeloang sebaka ka yuniti ea anhydroglucose, e bapala karolo ea bohlokoa ho fumaneng thepa ea li-ether tsa cellulose. DS e Phahameng ka kakaretso e amana le ho qhibiliha ho eketsehileng le katleho ea ho teteana.

2.Mekhoa ea Phello ea ho Tetefala

Tšusumetso ea ho teteana e bontšoang ke li-ether tsa cellulose e bakoa ke tšebelisano ea tsona le limolek'hule tsa metsi. Ha li qhalakanngoa ka metsing, li-ether tsa cellulose li feta hydration, moo limolek'hule tsa metsi li thehang maqhama a haedrojene le liathomo tsa oksijene tsa ether le lihlopha tsa hydroxyl tsa liketane tsa polymer. Ts'ebetso ena ea hydration e lebisa ho ruruha ha likaroloana tsa ether tsa cellulose le ho thehoa ha sebopeho sa marang-rang a mahlakore a mararo ka har'a sebaka sa metsi.

Ho kopana ha liketane tsa ether tsa cellulose tse nang le metsi le ho thehoa ha maqhama a haedrojene pakeng tsa limolek'hule tsa polymer ho tlatsetsa ntlafatsong ea viscosity. Ho phaella moo, ho lelekoa ha motlakase pakeng tsa lihlopha tsa ether tse nang le tjhaja e mpe ho thusa ho teteana ka ho thibela ho paka haufi ha liketane tsa polymer le ho khothalletsa ho hasana ka har'a solvent.

Boitšoaro ba rheological ba ditharollo tsa ether tsa cellulose bo susumetsoa ke mabaka a kang mahloriso a polymer, tekanyo ea ho nkeloa sebaka, boima ba limolek'hule le mocheso. Maemong a tlase, ditharollo tsa ether tsa cellulose li bontša boitšoaro ba Newtonian, athe maemong a holimo, li bontša boitšoaro ba pseudoplastic kapa ba ho fokotsa ho kuta ka lebaka la tšitiso ea ho hokelloa ha polymer tlas'a khatello ea ho kuta.

3. Mefuta ea Li-Ether tsa Cellulose
Li-ether tsa cellulose li akaretsa mefuta e fapaneng ea li-derivatives, e 'ngoe le e 'ngoe e fana ka thepa e itseng ea ho teteana e loketseng lits'ebetso tse fapaneng. Mefuta e meng e sebelisoang haholo ea li-ether tsa cellulose e kenyelletsa:

Methyl Cellulose (MC): Methyl cellulose e fumanoa ka ho fetola cellulose ka lihlopha tsa methyl. E qhibiliha ka metsing a batang 'me e etsa litharollo tse bonaletsang, tse tiileng. MC e na le litšobotsi tse ntle tsa ho boloka metsi 'me e sebelisoa hangata e le setefatsi sa thepa ea kaho, liphahlo le lihlahisoa tsa lijo.

Hydroxyethyl Cellulose (HEC): Hydroxyethyl cellulose ke synthesis

E qhibilihisoa ka ho kenya lihlopha tsa hydroxyethyl mokokotlong oa cellulose. E qhibiliha metsing a batang le a chesang 'me e bontša boitšoaro ba pseudoplastic. HEC e sebelisoa haholo mefuteng ea meriana, lihlahisoa tsa tlhokomelo ea botho, le e le setenya penteng ea latex.

Hydroxypropyl Cellulose (HPC): Hydroxypropyl cellulose e lokisoa ka ho fetola cellulose ka lihlopha tsa hydroxypropyl. E qhibiliha ka har'a mefuta e mengata ea li-solvents, ho kenyeletsoa metsi, joala le li-solvents tsa tlhaho. HPC e sebelisoa hangata e le sesebelisoa se teteaneng, se kopanyang le se etsang filimi meriana, litlolo le lipente.

Carboxymethyl Cellulose (CMC): Carboxymethyl cellulose e hlahisoa ke carboxymethylation ea cellulose ka chloroacetic acid kapa letsoai la eona la sodium. E qhibiliha haholo metsing 'me e etsa litharollo tse hlabang tse nang le boitšoaro bo botle ba pseudoplastic. CMC e fumana ts'ebeliso e pharaletseng lihlahisoa tsa lijo, meriana, masela le tlhahiso ea pampiri.

Li-ether tsena tsa cellulose li bontša litšobotsi tse ikhethang tsa ho teteana, litšobotsi tsa ho qhibiliha, le ho lumellana le metsoako e meng, e leng se etsang hore li lokele lits'ebetso tse fapaneng ho pholletsa le liindasteri.

4. Litšebeliso tsa Cellulose Ethers
Matla a ho tenya a di-ether tsa cellulose a feto-fetohang a etsa hore e be tsa bohlokwa haholo ditshebedisong tse fapaneng tsa indasteri. Ditshebediso tse ding tsa bohlokwa tsa di-ether tsa cellulose di kenyeletsa:

Lisebelisoa tsa Kaho: Li-ether tsa cellulose li sebelisoa haholo e le lintho tse eketsang linthong tse thehiloeng samenteng tse kang seretse, grout, le plaster ho ntlafatsa ho sebetsa hantle, ho boloka metsi le ho khomarela. Li sebetsa e le li-rheology modifiers, li thibela karohano le ho ntlafatsa ts'ebetso ea lihlahisoa tsa kaho.

Meriana: Li-ether tsa cellulose li fumana ts'ebeliso e pharaletseng mefuteng ea meriana e le li-binder, disintegrants, le li-agent tse tenyang matlapeng, li-capsules, li-suspension le litharollo tsa mahlo. Li ntlafatsa litšobotsi tsa phallo ea phofo, li nolofatsa khatello ea matlapa, 'me li laola ho lokolloa ha metsoako e sebetsang.

Lihlahisoa tsa Lijo: Li-ether tsa cellulose li atisa ho sebelisoa e le metsoako e tiisang, e tsitsisang le e etsang hore li be le jelly lihlahisoa tse ngata tsa lijo, ho kenyeletsoa le lisoso, li-dressing, lijo tse tsoekere le lihlahisoa tsa lebese. Li ntlafatsa sebopeho, ho teteana le ho ikutloa ha molomo ha li ntse li ntlafatsa botsitso ba shelefo le ho thibela ho kopana ha tsona.

Litlolo le Tlhokomelo ea Motho ka Mong: Li-ether tsa cellulose li sebelisoa litlolong le lihlahisoa tsa tlhokomelo ea motho ka mong tse kang litlolo, litlolo, li-shampoo le sesepa sa meno e le li-thickeners, li-emulsifier, le lintho tse etsang filimi. Li fana ka thepa e lakatsehang ea rheological, li ntlafatsa botsitso ba sehlahisoa, 'me li fana ka sebopeho se boreleli le se mabothobotho.

Lipente le Liaparo:Li-ether tsa seluloseLi sebetsa e le li-modifiers tsa rheology penteng, liphahlong le likhomaretsing, li ntlafatsa taolo ea viscosity, khanyetso ea ho oa le ho thehoa ha filimi. Li kenya letsoho botsitsong ba metsoako, li thibela ho lula ha pigment, 'me li ntlafatsa litšobotsi tsa ts'ebeliso.

Tšusumetso ea ho teteana ha li-ether tsa cellulose e bapala karolo ea bohlokoa lits'ebetsong tse fapaneng tsa indasteri le mefuteng ea lihlahisoa. Thepa ea tsona e ikhethang ea rheological, ho lumellana le metsoako e meng, le ho bola ha lintho tse phelang li etsa hore e be likhetho tse khethiloeng bakeng sa bahlahisi makaleng a fapaneng. Ha liindasteri li ntse li tsoela pele ho beha pele litharollo tsa botsitso le tse mosa tikolohong, tlhoko ea li-ether tsa cellulose e lebelletsoe ho eketseha haholo.