Phello e matla ea cellulose ether

Li-cellulose etherske sehlopha sa li-polymer tse tenyetsehang tse sebelisoang haholo liindastering tse fapaneng bakeng sa thepa ea tsona e teteaneng. Ho qala ka kenyelletso ea li-cellulose ethers le litšobotsi tsa tsona tsa sebopeho, pampiri ena e hlahlobisisa mekhoa e ka morao ea phello ea bona e teteaneng, e hlakisa hore na ho sebelisana le limolek'hule tsa metsi ho lebisa ntlafatsong ea viscosity joang. Ho buisanoa ka mefuta e fapaneng ea li-cellulose ethers, ho kenyelletsa methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, le carboxymethyl cellulose, e 'ngoe le e' ngoe e na le litšobotsi tse ikhethang tsa ho tenya. ts'ebeliso ea li-cellulose ethers liindastering tse joalo ka kaho, meriana, lijo, litlolo le tlhokomelo ea motho ka mong, e totobatsang karolo ea bona ea bohlokoahali ho thehoeng ha lihlahisoa le lits'ebetsong tsa tlhahiso. Qetellong, bohlokoa ba li-cellulose ethers mekhoeng ea morao-rao ea indasteri bo hatisoa, hammoho le litebello tsa nako e tlang le tsoelo-pele e ka bang teng ho theknoloji ea cellulose ether.

Li-cellulose ethers li emela sehlopha sa li-polymers tse nkiloeng ho cellulose, biopolymer e fumanehang hohle e fumanehang ka bongata maboteng a lisele tsa limela. Ka thepa e ikhethang ea physicochemical, cellulose ethers e sebelisoa haholo liindastering tse fapaneng, haholo-holo bakeng sa phello ea tsona e ntseng e eketseha. Bokhoni ba li-cellulose ethers ho eketsa viscosity le ho ntlafatsa thepa ea rheological e etsa hore e be ea bohlokoa haholo lits'ebetsong tse ngata ho tloha ho thepa ea kaho ho isa ho metsoako ea meriana.

1.Lintho tsa Sebopeho sa Cellulose Ethers

Pele o kenella ka har'a phello e teteaneng ea li-cellulose ethers, ho bohlokoa ho utloisisa sebopeho sa tsona. Li-cellulose ethers li entsoe ka phetoho ea lik'hemik'hale ea selulose, haholo-holo e kenyelletsang karabelo ea etherification. Lihlopha tsa hydroxyl (-OH) tse teng mokokotlong oa selulose li etsa liphetoho le lihlopha tsa ether (-OR), moo R e emelang tse ling tse fapaneng. Phapang ena e lebisa phetohong ea sebopeho sa limolek'hule le thepa ea selulose, e fanang ka litšobotsi tse ikhethang ho li-cellulose ethers.

Liphetoho tsa sebopeho ho li-cellulose ethers li susumetsa ho qhibiliha ha tsona, boitšoaro ba rheological, le thepa ea tsona e teteaneng. Digree of substitution (DS), e bolelang palohare ya palo ya dihlopha tsa hydroxyl tse nketsweng sebaka ka yuniti ya anhydroglucose, e na le seabo sa bohlokwa ho tseba hore na dibopeho tsa cellulose ethers. DS e phahameng hangata e tsamaisana le ho qhibiliha ho eketsehileng le katleho e kholo.

2.Mechanisms of Thickening Effect

Phello e matla e bontšitsoeng ke cellulose ethers e bakoa ke ho sebelisana ha tsona le limolek'hule tsa metsi. Ha li qhalakane ka metsing, li-cellulose ethers li kena ho hydration, moo limolek'hule tsa metsi li etsang maqhama a hydrogen le liathomo tsa ether tsa oksijene le lihlopha tsa hydroxyl tsa liketane tsa polymer. Ts'ebetso ena ea hydration e lebisa ho ho ruruha ha likaroloana tsa cellulose ether le ho thehoa ha sebopeho sa marang-rang a mararo ka har'a sebaka se nang le metsi.

Ho ts'oaroa ha liketane tsa hydrated cellulose ether le ho thehoa ha maqhama a hydrogen pakeng tsa limolek'hule tsa polymer ho kenya letsoho ntlafatsong ea viscosity. Ho phaella moo, ho repulsion electrostatic pakeng tsa lihlopha hampe qosoa ether thusa ka ho eketsehileng ka thickening ka ho thibela ho paka haufi le polymer liketane le ho khothalletsa ho hasana ka solvent.

Boitšoaro ba rheological ba tharollo ea cellulose ether bo susumetsoa ke lintlha tse kang polymer concentration, degree of substitution, boima ba limolek'hule le mocheso. Maemong a tlase, litharollo tsa ether ea cellulose li bonts'a boits'oaro ba Newtonian, athe maemong a holimo, li bonts'a boits'oaro ba pseudoplastic kapa shear-thinning ka lebaka la tšitiso ea li-polymer entanglements tlas'a khatello ea ho kuta.

3.Mefuta ea Cellulose Ethers
Li-cellulose ethers li kenyelletsa mefuta e fapaneng ea li-derivatives, e 'ngoe le e' ngoe e fana ka thepa e itseng e teteaneng e loketseng lits'ebetso tse fapaneng. Mefuta e meng e sebelisoang hangata ea cellulose ethers e kenyelletsa:

Methyl Cellulose (MC): Methyl cellulose e fumanoa ka etherification ea selulose ka lihlopha tsa methyl. E qhibiliha metsing a batang 'me e etsa litharollo tse bonaletsang, tse nang le viscous. MC e bonts'a thepa e ntle ea ho boloka metsi 'me hangata e sebelisoa e le motenya oa thepa ea kaho, litlolo le lihlahisoa tsa lijo.

Hydroxyethyl Cellulose (HEC): Hydroxyethyl cellulose ke synthesi

ka ho hlahisa lihlopha tsa hydroxyethyl mokokotlong oa cellulose. E qhibiliha ka metsing a batang le a chesang 'me e bontša boitšoaro ba pseudoplastic. HEC e sebelisoa haholo mekhoeng ea meriana, lihlahisoa tsa tlhokomelo ea botho, le e le motenya oa lipente tsa latex.

Hydroxypropyl Cellulose (HPC): Hydroxypropyl cellulose e lokisoa ka etherification ea cellulose ka lihlopha tsa hydroxypropyl. E qhibiliha mefuteng e mengata e fapaneng ea lihlapolli, ho kenyeletsoa metsi, joala, le metsoako ea organic. HPC hangata e sebelisoa e le setei, se tlamang le ho etsa lifilimi ho tsa meriana, litlolo le litlolo.

Carboxymethyl Cellulose (CMC): Carboxymethyl cellulose e hlahisoa ke carboxymethylation ea cellulose e nang le chloroacetic acid kapa letsoai la eona la sodium. E qhibiliha haholo metsing 'me e etsa litharollo tsa viscous tse nang le boits'oaro bo botle ba pseudoplastic. CMC e fumana lits'ebetso tse pharalletseng lihlahisoa tsa lijo, meriana, masela le tlhahiso ea pampiri.

Li-cellulose ethers tsena li bonts'a thepa ea botenya e ikhethang, litšoaneleho tsa ho qhibiliha, le ho tsamaellana le lisebelisoa tse ling, li li etsa hore li tšoanelehe bakeng sa lits'ebetso tse fapaneng ho pholletsa le liindasteri.

4.Likopo tsa Cellulose Ethers
Lits'ebetso tse tenyetsehang tsa li-cellulose ethers li etsa hore e be tsa bohlokoa haholo lits'ebetsong tse fapaneng tsa indasteri. Lisebelisoa tse ling tsa bohlokoa tsa cellulose ethers li kenyelletsa:

Lisebelisoa tsa Kaho: Li-cellulose ethers li sebelisoa haholo e le li-additives linthong tse entsoeng ka samente tse kang seretse, grout le plaster ho ntlafatsa ts'ebetso, ho boloka metsi le ho khomarela. Li sebetsa joaloka li-rheology modifiers, li thibela ho arohana le ho ntlafatsa ts'ebetso ea lihlahisoa tsa kaho.

Meriana: Li-cellulose ethers li fumana ts'ebeliso e pharaletseng mefuteng ea meriana e le li-binders, disintegrants, le li-thickening agents ka matlapeng, li-capsules, suspensions, le litharollo tsa mahlo. Ba ntlafatsa thepa ea phallo ea li-powders, ba thusa ho hatella letlapa, le ho laola ho lokolloa ha metsoako e sebetsang.

Lihlahisoa tsa Lijo: Li-cellulose ethers li atisa ho sebelisoa e le ho tiisa, ho tsitsisa le ho hlahisa lihlahisoa tsa lijo tse ngata, ho akarelletsa le li-sauces, liaparo, li-dessert le lihlahisoa tsa lebese. Li ntlafatsa sebopeho, viscosity le molomo ha li ntse li ntlafatsa botsitso ba sethala le ho thibela syneresis.

Litlolo le Tlhokomelo ea Motho: Li-cellulose ethers li sebelisoa litlolong le lihlahisoa tsa tlhokomelo ea botho tse kang litlolo, litlolo, li-shampoo le sesepa sa meno e le lintho tse teteaneng, li-emulsifiers le lintho tse etsang lifilimi. Li fana ka lintho tse lakatsehang tsa rheological, li matlafatsa botsitso ba sehlahisoa, 'me li fana ka sebopeho se boreleli, se mabothobotho.

Lipente le Liaparo:Li-cellulose etherse sebetsa e le li-addifiers tsa rheology lipente, lirafshoa le likhomaretsi, li ntlafatsa taolo ea viscosity, ho hanyetsa ho sag le sebopeho sa lifilimi. Li kenya letsoho ho tsitsang ha metsoako, li thibela ho tsitsisa ha pigment, le ho ntlafatsa thepa ea kopo.

Tšusumetso e matla ea cellulose ethers e bapala karolo ea bohlokoa lits'ebetsong tse fapaneng tsa indasteri le libopeho tsa lihlahisoa. Litšobotsi tsa tsona tse ikhethang tsa rheological, ho lumellana le metsoako e meng, le ho senyeha ha bioloji li etsa hore e be khetho e ratoang ke baetsi ba likarolo tse fapaneng. Ha liindasteri li ntse li tsoela pele ho etelletsa pele tharollo ea ts'ebetso le eco-friendly, tlhoko ea li-cellulose ethers e lebelletsoe ho nyoloha le ho feta.