Li-ether tsa starch le cellulose ethers ka bobeli ke li-ether tse bapalang karolo ea bohlokoa liindastering tse fapaneng, haholo-holo kahong le joalo ka litlatsetso lihlahisoa tse fapaneng.Le hoja li na le ho tšoana ho itseng, ke metsoako e fapaneng e nang le libopeho tse fapaneng tsa lik'hemik'hale, thepa le lisebelisoa.
1. Sebopeho sa lik'hemik'hale:
Starch ether:
Li-starch ethers li tsoa ho starch, polysaccharide e entsoeng ka likaroloana tsa tsoekere.Sebopeho sa lik'hemik'hale sa starch se na le likarolo tse peli tse kholo: amylose (ketane e lekanang ea limolek'hule tsa tsoekere e kopantsoeng ke α-1,4-glycosidic bond) le amylopectin (e nang le α-1,4 le α-1,6- Lipolymers tsa makala tse nang le li-glycosidic bond. ) kopano.Li-ether tsa starch li fumanoa ka ho fetola lihlopha tsa hydroxyl tsa starch ka mokhoa oa etherification.
Cellulose ether:
Cellulose, ka lehlakoreng le leng, ke polysaccharide e 'ngoe, empa sebopeho sa eona se na le lihlopha tsa tsoekere tse kopantsoeng ke li-bond β-1,4-glycosidic.Li-cellulose ethers li nkiloe ho selulose ka mokhoa o tšoanang oa etherification.Li-unit tse pheta-phetoang ka selulose li hokahanngoa ke li-bond tsa beta, ho etsa sebopeho sa linear le se khanyang haholo.
2. Mohloli:
Starch ether:
Setache haholo-holo se tsoa limela tse kang poone, koro le litapole.Limela tsena ke matamo a starch 'me starch ethers e ka ntšoa le ho sebetsoa.
Cellulose ether:
Cellulose ke karolo e ka sehloohong ea marako a lisele tsa semela mme e teng hohle ka tlhaho.Mehloli e tloaelehileng ea selulose e kenyelletsa makhasi a lehong, k'hothone le likhoele tse fapaneng tsa semela.Li-cellulose ethers li hlahisoa ka ho fetola limolek'hule tsa cellulose tse nkiloeng mehloling ena.
3. Ts'ebetso ea Etherification:
Starch ether:
Mokhoa oa etherification oa starch o kenyelletsa ho kenngoa ha lihlopha tsa ether ka har'a lihlopha tsa hydroxyl (OH) tse teng ka har'a limolek'hule tsa starch.Lihlopha tse tloaelehileng tsa ether tse kenyelletsoeng li kenyelletsa methyl, ethyl, hydroxyethyl, le hydroxypropyl, e leng se bakang liphetoho ho thepa ea starch e fetotsoeng.
Cellulose ether:
Etherification ea cellulose e kenyelletsa ts'ebetso e ts'oanang eo ho eona lihlopha tsa ether li kenngoang lihlopheng tsa hydroxyl tsa selulose.Li-derivatives tse tloaelehileng tsa cellulose ether li kenyelletsa methylcellulose, ethylcellulose, hydroxyethylcellulose le carboxymethylcellulose.
4. Sollubility:
Starch ether:
Li-starch ethers hangata li na le ho qhibiliha ha metsi ho tlase ho feta cellulose ethers.Ho ipapisitse le sehlopha se ikhethileng sa ether se kentsoeng nakong ea phetoho, li ka bonts'a likhato tse fapaneng tsa solubility.
Cellulose ether:
Li-cellulose ethers li tsejoa ka thepa ea tsona e qhibilihang ka metsing kapa e qhalakahang ka metsing.Solubility e itšetlehile ka mofuta le tekanyo ea sebaka sa ether.
5. Ts'ebetso ea ho etsa lifilimi:
Starch ether:
Li-starch ethers ka kakaretso li na le bokhoni bo fokolang ba ho etsa lifilimi ka lebaka la sebopeho sa tsona sa semi-crystalline.Filimi e hlahisoang e ka 'na ea se ke ea bonahala pepeneneng' me ea fokola ho feta lifilimi tse entsoeng ka cellulose ethers.
Cellulose ether:
Li-cellulose ethers, haholo-holo li-derivatives tse ling tse kang methylcellulose, li tsejoa ka thepa ea tsona e babatsehang ea ho etsa lifilimi.Li ka etsa lifilimi tse hlakileng le tse tenyetsehang, tsa etsa hore e be tsa bohlokoa lits'ebetsong tse kang liphahlo le likhomaretsi.
6. Lintho tsa Rheological:
Starch ether:
Li-starch ethers li ka eketsa viscosity ea tharollo ea metsi, empa boitšoaro ba bona ba rheological bo ka fapana le li-cellulose ethers.Phello ea viscosity e itšetlehile ka lintlha tse kang tekanyo ea ho fetola le boima ba limolek'hule.
Cellulose ether:
Li-cellulose ethers li tsebahala haholo ka bokhoni ba tsona ba ho laola rheology.Li ka ama viscosity haholo, ho boloka metsi le thepa ea phallo ka mefuta e fapaneng ea likopo ho kenyelletsa lipente, likhomaretsi le thepa ea kaho.
7. Kopo:
Starch ether:
Li-starch ethers li ka sebelisoa indastering ea lijo, ea masela le ea meriana.Indastering ea kaho, li sebelisoa ka seretse, li-plaster le li-adhesives ho ntlafatsa thepa e kang ho boloka metsi le ho sebetsa.
Cellulose ether:
Li-cellulose ethers li sebelisoa haholo ho tsa meriana, lijo, litlolo le masimo a kaho.Li sebelisoa haholo e le li-thickeners, stabilizers le rheology modifiers ka lipente, lirekere, likhomaretsi tsa lithaele le libopeho tse fapaneng.
8. Biodegradability:
Starch ether:
Li-starch ethers li tsoa limela 'me hangata li khona ho senyeha.Li thusa ho eketsa botsitso ba lihlahisoa tse sebelisoang.
Cellulose ether:
Li-cellulose ethers tse nkiloeng ho selulose ea semela le tsona li ka senyeha.Tšebelisano ea bona ea tikoloho ke monyetla o ka sehloohong lits'ebetsong moo ho tšoarella e leng ntho e tlang pele.
ha re phethela:
Le hoja starch ethers le cellulose ethers li arolelana lintho tse ling tse tšoanang le tse tsoang ho polysaccharide, mekhoa ea bona e ikhethang ea lik'hemik'hale, mehloli, ho qhibiliha, thepa ea ho etsa lifilimi, boitšoaro ba rheological le likopo li li khetholla bakeng sa ho sebelisoa libakeng tse sa tšoaneng.Li-ether tsa starch tse nkiloeng ho starch le cellulose ethers tse nkiloeng ho cellulose e 'ngoe le e' ngoe e na le melemo e ikhethang maemong a fapaneng.Ho utloisisa liphapang tsena ho bohlokoa bakeng sa ho khetha ether e nepahetseng bakeng sa ts'ebeliso e itseng, ho netefatsa ts'ebetso e nepahetseng le litšobotsi tse lakatsehang.
Nako ea poso: Jan-25-2024