Tsepamisa maikutlo ho Cellulose ethers

Phapano ke efe lipakeng tsa Hydroxyethyl cellulose (HEC) le Hydroxypropyl cellulose (HPC)?

Hydroxyethyl cellulose (HEC) le hydroxypropyl cellulose (HPC) ke lintho tse peli tse tloaelehileng tse tsoang ho selulose tse sebelisoang haholo mafapheng a mangata a indasteri, joalo ka meriana, litlolo, lijo le thepa ea kaho. Le hoja libopeho tsa tsona tsa lik'hemik'hale li tšoana 'me li thehoa ka ho hlahisa metsoako ea limolek'hule tsa cellulose, li na le phapang e kholo ea thepa ea lik'hemik'hale, thepa ea' mele le libaka tsa ts'ebeliso.

1. Phapang ea sebopeho sa lik'hemik'hale

Hydroxyethyl cellulose (HEC) e hlahisoa ka ho hlahisa sehlopha sa hydroxyethyl (-CH₂CH₂OH) ka har'a reng ea tsoekere ea molek'hule ea cellulose. Sebopeho sa eona sa lik'hemik'hale se na le palo e kholo ea li-substituents tsa hydroxyethyl, tse etsang hore HEC e be le lintho tse ntle tsa ho qhibiliha ha metsi le tse teteaneng.

Hydroxypropyl cellulose (HPC) e hlahisa sehlopha sa hydroxypropyl (-CH₂CHOHCH₃) ka har'a molek'hule ea cellulose. Ka lebaka la boteng ba sehlopha sena sa hydroxypropyl, HPC e bontša litšobotsi tse ling tse fapaneng le HEC. Ka mohlala, e na le tekanyo e itseng ea hydrophobicity, e leng se etsang hore e qhibilihe ka har'a li-solvents tse itseng, tse kang ethanol, joala ea isopropyl, joalo-joalo.

2. Liphapano tsa Sollubility

E 'ngoe ea likarolo tse ka sehloohong tsa HEC ke ho qhibiliha ha eona hantle ha metsi, haholo-holo metsing a batang. Ka lebaka la ho kenngoa ha lihlopha tsa hydroxyethyl, HEC e ka theha likamano tsa hydrogen le limolek'hule tsa metsi ha li qhibiliha, kahoo li qhalakanngoa le ho qhibiliha kapele. Ka hona, HEC e na le mefuta e mengata ea likopo tsa mekhoa e thehiloeng metsing, e kang ho roala metsi, li-adhesives, detergents, joalo-joalo.

The solubility ea HPC e batla e rarahane. Ho qhibiliha ha HPC metsing ho angoa haholo ke mocheso. E na le ho qhibiliha ha mocheso mochesong o tlase, empa gelation kapa pula e ka hlaha ka mocheso o phahameng. Ka nako e ts'oanang, HPC e boetse e na le ho qhibiliha ha metsoako ea manyolo (joalo ka ethanol, joala ea isopropyl, joalo-joalo), e fanang ka melemo ho lisebelisoa tse ling tse khethehileng, tse kang lihlahisoa tse thehiloeng ho solvent le litokisetso tse itseng tsa meriana.

3. Phapang ka phello e teteaneng le rheology

HEC e na le bokhoni bo botle ba ho tiisa 'me e ka eketsa haholo viscosity ea tharollo ka tharollo ea metsi, kahoo e atisa ho sebelisoa e le motenya, stabilizer le gelling agent. Phello e matla ea HEC e angoa ke boima ba limolek'hule le tekanyo ea ho kenya sebaka. Ha boima ba limolek'hule bo le boholo 'me bo phahame ka tekanyo ea ho fetola, ho na le viscosity e kholoanyane ea tharollo. Ka nako e ts'oanang, boitšoaro ba rheological ba tharollo ea HEC ke pseudoplastic, ke hore, ha sekhahla sa ho kuta se ntse se eketseha, viscosity ea tharollo e fokotseha, e thusang haholo bakeng sa libopeho tse hlokang botsitso le phallo e ntle.

Tšusumetso e matla ea HPC e batla e fokola, empa ka lebaka la litšobotsi tsa eona tsa sebopeho sa limolek'hule, tharollo ea eona e bonts'a thepa e fapaneng ea rheological. Litharollo tsa HPC hangata li na le thepa ea mokelikeli oa Newtonian, ke hore, viscosity ea tharollo e ikemetse ka sekhahla sa ho kuta, se bohlokoa haholo lits'ebetsong tse ling tse hlokang viscosity e tšoanang. Ho feta moo, HPC e boetse e na le thepa e ntle ea ho etsa lifilimi, e etsang hore e sebelisoe haholo masimong a kang meriana le liphahlo.

4. Ho tsitsa le ho hanyetsa lik'hemik'hale

HEC e bonts'a botsitso bo phahameng ba lik'hemik'hale mefuteng e fapaneng ea boleng ba pH 'me hangata e ka sebetsa ka mokhoa o tsitsitseng pH ea 2 ho ea ho 12. Ka hona, HEC e loketse ho sebelisoa tlas'a maemo a acidic le alkaline 'me e sebelisoa haholo ho li-detergents, litlolo le masimo a mang.

Le hoja HPC e na le botsitso bo botle ba lik'hemik'hale, ho ikamahanya le maemo a pH ho fokotseha hanyenyane, 'me ka kakaretso e loketse tikoloho e sa nke lehlakore kapa e fokolang ea asiti. Maemong a mang moo ho hlokahalang filimi kapa hydrophobicity, HPC e ka fana ka ts'ebetso e babatsehang ka lebaka la sebopeho sa eona se khethehileng, joalo ka thepa e sa khaotseng kapa karolo ea ho roala bakeng sa lithethefatsi.

5. Liphapang mafapheng a kopo

Mabaka a kopo ea HEC haholo-holo a kenyelletsa:

Lisebelisoa tsa Kaho: Joaloka moemeli oa motenya le oa gelling, HEC e sebelisoa haholo ka thepa e entsoeng ka samente, liphahlo le lirekere tsa kaho ho thusa ho ntlafatsa ts'ebetso ea kaho le ho thibela metsi.

Liaparo le lipente: HEC e sebelisoa ka liphahlo tse entsoeng ka metsi ho tiisa, ho emisa, ho qhalakanya le ho tsitsisa, ka tsela eo ho ntlafatsa ho sebetsa le ponahalo ea seaparo.

Lihlahisoa tsa lik'hemik'hale tsa letsatsi le letsatsi: Ka lihlahisoa tsa letsatsi le letsatsi tsa lik'hemik'hale tse kang li-detergents le shampoos, HEC e sebetsa e le motenya le stabilizer, e ka ntlafatsang sebopeho le phihlelo ea tšebeliso ea sehlahisoa.

Libaka tse kholo tsa ts'ebeliso ea HPC li kenyelletsa:

Tšimo ea meriana: HPC e atisa ho sebelisoa e le lisebelisoa tsa ho roala le litokisetso tsa nako e telele tsa tokollo ea lithethefatsi ka lebaka la thepa ea eona e babatsehang ea ho etsa lifilimi le ho lokolloa ka mokhoa o tsitsitseng. Ho feta moo, e boetse e na le lits'ebetso tsa bohlokoa ho li-binders tsa matlapa.

Lijo le litlolo: HPC e sebelisoa e le ntho e tenya le emulsifier indastering ea lijo, hape e le ntho ea ho etsa lifilimi ho litlolo ho thusa ho ntlafatsa sebopeho le ho tsitsa ha lihlahisoa.

Li-Coatings le Inks: Ka lebaka la ho qhibiliha ha eona le thepa ea ho etsa lifilimi, HPC e atisa ho sebelisoa ha ho etsoa litlolo le li-inki tse hlokang li-solvents tsa organic, ho fana ka lihlopha tse boreleli tsa filimi le ho phalla hantle.

6. Tšireletso le polokeho ea tikoloho

Ka bobeli HEC le HPC li nkoa e le lisebelisoa tse sireletsehileng bakeng sa 'mele oa motho le tikoloho 'me li sebelisoa haholo lihlahisoa tse hlokang ho kopana le' mele oa motho, tse kang litlolo le meriana. Leha ho le joalo, HPC e qhibiliha ka har'a li-solvents tse itseng, tse ka 'nang tsa baka mathata a itseng ho likopo tse nang le litlhoko tse phahameng tsa tikoloho, ha HEC e sebelisoa haholo-holo mefuteng e qhibilihisang metsi, kahoo ho bonolo ho finyella litlhoko tse tala tsa tikoloho.

Hydroxyethyl cellulose (HEC) le hydroxypropyl cellulose (HPC), e le li-derivatives tsa cellulose, li na le lintho tse tšoanang ka sebopeho sa lik'hemik'hale, solubility, phello e teteaneng, thepa ea rheological, masimo a kopo le thepa ea tšireletso ea tikoloho. Ho na le phapang e kholo ka likarolo. Ka lebaka la thepa ea eona e babatsehang ea ho qhibiliha ha metsi le ho teteka ha metsi, HEC e sebelisoa haholo ka mekhoa e entsoeng ka metsi, e kang ho roala, thepa ea mohaho le lihlahisoa tsa letsatsi le letsatsi tsa lik'hemik'hale. HPC e na le lits'ebetso tse ikhethileng ho tsa meriana, lijong le liphaepheng tse ling tse khethehileng ka lebaka la ho qhibiliha ha eona, ho etsa lifilimi le thepa ea eona e tsoelang pele. Khetho ea hore na u ka sebelisa derivative efe ea cellulose hangata e itšetlehile ka litlhoko tse khethehileng tsa kopo le litlhoko tsa ho etsoa.


Nako ea poso: Oct-29-2024
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