Motswako o sa tebang, o bapalang karolo ea bohlokoa ho ntlafatseng ts'ebetso ea ho haha seretse se kopantsoeng le metsi, o ikarabella ho feta 40% ea litšenyehelo tsa thepa ka seretse se kopantsoeng le metsi. Bongata ba metsoako 'marakeng oa lehae bo fanoa ke bahlahisi ba kantle ho naha, 'me tekanyo ea litšupiso ea lihlahisoa le eona e fanoa ke bafepedi. Litšenyehelo tsa sehlahisoa sa seretse se kopantsoeng le metsi se ntse se le holimo ka hona, 'me ho thata ho etsa hore seretse se tloaelehileng sa majoe le sa ho sela ka bongata bo boholo le mefuta e mengata. Lihlahisoa tsa 'maraka oa maemo a holimo li laoloa ke lik'hamphani tsa kantle ho naha, 'me bahlahisi ba seretse se kopantsoeng le metsi ba na le phaello e tlase le theko e tlase; ts'ebeliso ea metsoako ha e na lipatlisiso tse hlophisitsoeng le tse shebaneng le tsona, 'me e latela mekhoa ea kantle ho naha ka bofofu. Mona, seo re se arolelanang le uena ke hore, karolo ea hydroxypropyl methylcellulose ke efe metsoakong e tloaelehileng ea seretse se kopantsoeng le metsi?
Hydroxypropyl methylcellulose ke mofuta oa cellulose oo tlhahiso le tšebeliso ea oona li ntseng li eketseha ka potlako lilemong tsa morao tjena. Hydroxypropyl methylcellulose e entsoe ka k'hothone e hloekisitsoeng ka mor'a kalafo ea alkalization, ho sebelisoa propylene oxide le methyl chloride e le li-etherification agents, ether e tsoakiloeng ea cellulose e seng ionic e entsoeng ka letoto la liketso. Tekanyo ea ho nkeloa sebaka hangata ke 1.2 ~ 2.0. Thepa ea eona e fapane ho latela karolelano ea litaba tsa methoxyl le litaba tsa hydroxypropyl. Litšobotsi tsa hydroxypropyl methylcellulose ke tse latelang:
1. Hydroxypropyl methylcellulose e qhibiliha habonolo metsing a batang, 'me e tla tobana le mathata ha e qhibiliha ka metsing a chesang. Empa mocheso oa gelation ea eona metsing a chesang o phahame haholo ho feta oa methyl cellulose. Ho qhibiliha ha eona metsing a batang le hona ho ntlafetse haholo ha ho bapisoa le methyl cellulose.
2. Ho teteana ha hydroxypropyl methylcellulose ho amana le boima ba eona ba limolek'hule. Ha boima ba limolek'hule bo le boholo, ho teteana ho ba holimo. Mocheso le oona o ama ho teteana ha eona, ha mocheso o ntse o eketseha, ho teteana hoa fokotseha. Leha ho le joalo, tšusumetso ea ho teteana ha eona ho hoholo le mocheso e tlase ho feta ea methyl cellulose. Tharollo ea eona e tsitsitse ha e bolokoa mochesong oa kamore.
3. Ho boloka metsi ha hydroxypropyl methylcellulose ho itshetlehile ka bongata ba yona ba ho eketsa, viscosity, jj., mme sekgahla sa yona sa ho boloka metsi tlasa bongata bo lekanang ba ho eketsa se hodimo ho feta sa methyl cellulose.
4. Hydroxypropyl methylcellulose e tsitsitse ho ea ho asiti le alkali, 'me tharollo ea eona ea metsi e tsitsitse haholo ho tloha ho pH=2~12. Caustic soda le metsi a lime ha li na tšusumetso e kholo ts'ebetsong ea eona, empa alkali e ka potlakisa ho qhibiliha ha eona le ho eketsa viscosity ea eona hanyane. Hydroxypropyl methylcellulose e tsitsitse ho ea ho letsoai le tloaelehileng, empa ha mahloriso a tharollo ea letsoai a le holimo, viscosity ea tharollo ea hydroxypropyl methylcellulose e atisa ho eketseha.
5. Hydroxypropyl methylcellulose e ka kopanngoa le li-polymer tse qhibilihang ka metsing ho etsa tharollo e tšoanang le e nang le viscosity e phahameng. Tse kang polyvinyl alcohol, starch ether, vegetable gum, jj.
6. Hydroxypropyl methylcellulose e na le khanyetso e betere ea li-enzyme ho feta methylcellulose, 'me monyetla oa ho senyeha ha enzymatic ea tharollo ea eona o tlase ho feta oa methylcellulose.
7. Ho khomarela ha hydroxypropyl methylcellulose kahong ea seretse ho phahame ho feta ha methylcellulose.
Nako ea poso: Mots'eanong-09-2023