Focus on Cellulose ethers

Phapano ke efe lipakeng tsa HPMC le MC?

A:

MC ke methyl cellulose: e hloekisitsoe k'hothone ka mor'a phekolo ea alkali, methane chloride e le etherifying agent, ka letoto la liketso ho etsa cellulose ether.Ka kakaretso, tekanyo ea ho fetola ke 1.6 ~ 2.0, 'me ho qhibiliha ho fapana ho ea ka tekanyo ea ho kenya sebaka.Ke ea nonionic cellulose ether.

(1) Ho boloka metsi a methyl cellulose ho ipapisitse le palo ea eona ea tlatsetso, viscosity, botle ba likaroloana le sekhahla sa ho qhibiliha.Ka kakaretso eketsa palo e kholo, fineness e nyane, viscosity, sekhahla sa ho boloka metsi se phahame.Palo ea li-additives e na le tšusumetso e kholo ho tekanyo ea ho boloka metsi, 'me viscosity ha e lekane le tekanyo ea ho boloka metsi.Sekhahla sa ho qhibiliha haholo-holo se ipapisitse le tekanyo ea phetoho ea holim'a metsi le bokhabane ba likaroloana tsa cellulose.Ho li-ether tse 'maloa tse kaholimo tsa cellulose, sekhahla sa ho boloka metsi sa methyl cellulose le HPMC hydroxypropyl methyl cellulose se phahame.

(2) Methyl cellulose e qhibiliha ka metsing a batang, ao ho leng thata ho qhibiliha ka metsing a chesang.Tharollo ea eona ea metsi e tsitsitse haholo ka hare ho pH = 3 ~ 12.E lumellana hantle le starch, guanidine gum le li-surfactants tse ngata.Gelation e etsahala ha mocheso o fihla mocheso oa gelation.

(3) Phetoho ea mocheso e tla ama ka botebo sekhahla sa ho boloka metsi sa methyl cellulose.Ka kakaretso, ha thempereichara e phahame, ho mpefala ha metsi ho boloka metsi.Haeba mocheso oa seretse o feta 40 ℃, ho bolokoa ha metsi a methyl cellulose ho tla mpefala haholo, e leng ho amang ho aha ha seretse ka botebo.

(4) Methyl cellulose e na le tšusumetso e hlakileng mabapi le ho hahoa le ho khomarela seretse."Ho khomarela" mona ho bolela ho khomarela ho utluoa ke mosebeletsi pakeng tsa sesebelisoa le lerako la lerako, e leng ho hanyetsa ha seretse sa seretse.Ho khomarela ho hoholo, ho hanyetsa ho kuta ha seretse ho hoholo, matla a hlokoang ke basebetsi ha a ntse a sebelisoa le ona a maholo, 'me ho hahoa ha seretse ho futsanehile.Ka lihlahisoa tsa cellulose ether, ho khomarela ha methyl cellulose ho boemong bo itekanetseng.

HPMC ke hydroxypropyl methyl cellulose: e entsoe ka k'hothone e hloekisitsoeng ka mor'a phekolo ea alkali, e nang le propylene oxide le chloromethane e le etherifying agent, ka letoto la liketso le ho etsoa ka selulose e seng ea ionic e kopantsoeng le ether.Tekanyo ea ho nka sebaka ka kakaretso ke 1.2 ~ 2.0.Thepa ea eona e fapana ho latela karolo ea methoxy le hydroxypropyl content.

(1) HPMC hydroxypropyl methyl cellulose e qhibiliha habonolo metsing a batang, ao ho leng thata ho a qhibiliha ka metsing a chesang.Leha ho le joalo, mocheso oa eona oa gelation metsing a chesang ho hlakile hore o phahame ho feta oa methyl cellulose.Ho qhibiliha ha methyl cellulose metsing a batang le hona ho ile ha ntlafatsoa haholo.

(2) Viscosity ea HPMC hydroxypropyl methyl cellulose e amana le boima ba eona ba molek'hule, 'me ha boima ba molek'hule bo phahame, ho ba le viscosity e phahameng.Mocheso o boetse o ama viscosity.Viscosity ea fokotseha ha mocheso o ntse o eketseha.Empa phello ea eona ea mocheso o phahameng oa viscosity e tlase ho feta ea methyl cellulose.Tharollo e tsitsitse ha e bolokiloe mocheso oa kamore.

(3) HPMC hydroxypropyl methyl cellulose e tsitsitse ho acid le setsi, 'me tharollo ea eona ea metsi e tsitsitse haholo ka pH = 2 ~ 12.Soda ea caustic le metsi a lime ha li na phello e fokolang ho thepa ea eona, empa alkali e ka potlakisa sekhahla sa ho qhibiliha le ho ntlafatsa viscosity.HPMC hydroxypropyl methyl cellulose e tsitsitse ho matsoai a akaretsang, empa ha motsoako oa motsoako oa letsoai o phahame, viscosity ea HPMC hydroxypropyl methyl cellulose tharollo e atisa ho eketseha.

(4) Poloko ea metsi ea HPMC hydroxypropyl methyl cellulose e itšetlehile ka tekanyo ea eona le viscosity, 'me sekhahla sa ho boloka metsi sa HPMC hydroxypropyl methyl cellulose se phahame ho feta sa methyl cellulose ka tekanyo e tšoanang.

(5) HPMC hydroxypropyl methyl cellulose e ka tsoakoa le metsoako ea polymer e qhibilihang ka metsi hore e be tharollo e tšoanang, e phahameng ea viscosity.Joalo ka joala ba polyvinyl, starch ether, sekhomaretsi sa meroho joalo-joalo.

(6) Ho khomarela ha HPMC hydroxypropyl methyl cellulose mohahong oa seretse ho phahame ho feta methyl cellulose.

(7) HPMC hydroxypropyl methyl cellulose e na le khanyetso e ntle ea enzyme ho feta methyl cellulose, 'me monyetla oa ho senyeha ha enzyme ea eona o tlase ho feta oa methyl cellulose.


Nako ea poso: May-26-2022
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