Methylhydroxyethylcellulose (MHEC) ke karolo ea bohlokoa liindastering tse fapaneng, haholo-holo ho tsa kaho, meriana le lihlahisoa tsa tlhokomelo ea motho. Mosebetsi oa eona oa mantlha e le ntho e bolokang metsi e etsa hore e be ea bohlokoa haholo lits'ebetsong tse kang lisebelisoa tsa samente, metsoako ea meriana le litlolo.
1. Sebopeho sa Limolek'hule tsa MHEC:
MHEC ke ea lelapa la cellulose ethers, e leng li-derivatives tsa cellulose-polymer ea tlhaho e fumanehang maboteng a lisele tsa limela. MHEC e entsoe ka etherification ea cellulose, moo lihlopha tsa methyl le hydroxyethyl li kenngoa mokokotlong oa cellulose. Tekanyo ea ho kenya sebaka (DS) ea lihlopha tsena e fapana, e amang thepa ea MHEC e kang solubility, viscosity, le matla a ho boloka metsi.
2. Sollubility le Phahamiso:
MHEC e bonts'a ho qhibiliha hantle metsing ka lebaka la boteng ba lihlopha tsa hydrophilic hydroxyethyl. Ha li hasane ka metsing, limolek'hule tsa MHEC li kena ka har'a hydration, ka limolek'hule tsa metsi tse etsang likamano tsa hydrogen le lihlopha tsa hydroxyl tse teng haufi le mokokotlo oa cellulose. Ts'ebetso ena ea hydration e fella ka ho ruruha ha likaroloana tsa MHEC le ho thehoa ha tharollo ea viscous kapa ho hasana.
3. Mokhoa oa ho Boloka Metsi:
Mokhoa oa ho boloka metsi oa MHEC o na le likarolo tse ngata mme o kenyelletsa lintlha tse 'maloa:
a. Hydrogen Bonding: Limolek'hule tsa MHEC li na le lihlopha tse ngata tsa hydroxyl tse khonang ho etsa likamano tsa hydrogen le limolek'hule tsa metsi. Tšebelisano ena e ntlafatsa ho boloka metsi ka ho koala metsi ka har'a matrix a polymer ka hydrogen bonding.
b. Bokhoni ba ho ruruha: Ho ba teng ha lihlopha tse peli tsa hydrophilic le hydrophobic ho MHEC ho lumella hore e ruruhe haholo ha e pepesehetse metsi. Ha limolek'hule tsa metsi li kenella ka har'a marang-rang a polymer, liketane tsa MHEC li ruruha, li etsa sebopeho se kang gel se bolokang metsi ka har'a matrix a eona.
c. Ketso ea Capillary: Likopong tsa kaho, MHEC e atisa ho eketsoa ho lisebelisoa tsa samente tse kang seretse kapa konkreite ho ntlafatsa ts'ebetso le ho fokotsa tahlehelo ea metsi. MHEC e sebetsa ka har'a li-capillary pores tsa lisebelisoa tsena, e thibela ho tsoa ha metsi ka potlako le ho boloka mongobo o tšoanang. Ketso ena ea capillary e ntlafatsa ka katleho mekhoa ea hydration le ho folisa, e lebisang ho matla a ntlafetseng le ho tšoarella ha sehlahisoa sa ho qetela.
d. Thepa ea ho Etsa Lifilimi: Ntle le bokhoni ba eona ba ho boloka metsi ka tharollo ea bongata, MHEC e ka boela ea etsa lifilimi tse tšesaane ha li sebelisoa holim'a metsi. Lifilimi tsena li sebetsa e le litšitiso, ho fokotsa tahlehelo ea metsi ka ho fetoha mouoane le ho fana ka tšireletso khahlanong le ho fetoha ha mongobo.
4. Tšusumetso ea Degree of Substitution (DS):
Tekanyo ea ho kenya sebaka sa lihlopha tsa methyl le hydroxyethyl mokokotlong oa cellulose e ama haholo thepa ea ho boloka metsi ea MHEC. Litekanyetso tse phahameng tsa DS hangata li baka bokhoni bo bongata ba ho boloka metsi ka lebaka la ho eketseha ha hydrophilicity le ho tenyetseha ha ketane. Leha ho le joalo, litekanyetso tse phahameng haholo tsa DS li ka lebisa ho viscosity e feteletseng kapa gelation, e amang ts'ebetso le ts'ebetso ea MHEC lits'ebetsong tse fapaneng.
5. Litšebelisano le likarolo tse ling:
Ka mekhoa e rarahaneng e kang ea meriana kapa lihlahisoa tsa tlhokomelo ea botho, MHEC e sebelisana le lisebelisoa tse ling, ho kenyelletsa metsoako e sebetsang, li-surfactants le li-thickeners. Litšebelisano tsena li ka ama botsitso ka kakaretso, viscosity, le katleho ea sebopeho. Ka mohlala, ho emisoa ha meriana, MHEC e ka thusa ho emisa metsoako e sebetsang ka mokhoa o lekanang ho pholletsa le mokelikeli oa metsi, ho thibela sedimentation kapa aggregation.
6. Maikutlo a Tikoloho:
Le hoja MHEC e khona ho senyeha 'me ka kakaretso e nkoa e le botsoalle ho tikoloho, tlhahiso ea eona e ka kenyelletsa mekhoa ea lik'hemik'hale e hlahisang litšila kapa lihlahisoa. Baetsi ba ntse ba tsoela pele ho hlahloba mekhoa e tsitsitseng ea tlhahiso le ho fumana selulose ho tsoa mehloling e nchafalitsoeng ea biomass ho fokotsa tšusumetso ea tikoloho.
7. Qetello:
Methylhydroxyethylcellulose (MHEC) ke sesebelisoa sa ho boloka metsi se sebetsang ka mokhoa o fapaneng se nang le lits'ebetso tse fapaneng liindastering tse fapaneng. Sebopeho sa eona sa limolek'hule, ho qhibiliha le ho sebelisana ha metsi le metsi ho etsa hore e boloke mongobo ka katleho, e ntlafatse ts'ebetso, le ho ntlafatsa ts'ebetso ea metsoako. Ho utloisisa mokhoa oa ho sebetsa oa MHEC ho bohlokoa bakeng sa ho ntlafatsa ts'ebeliso ea eona lits'ebetsong tse fapaneng ha ho ntse ho nahanoa ka lintlha tse kang tekanyo ea ho fetola, ho lumellana le lisebelisoa tse ling, le ho nahanela tikoloho.
Nako ea poso: Mar-19-2024