Starch ethers uye cellulose ethers ese ari maviri ether anoita basa rakakosha mumaindasitiri akasiyana, kunyanya mukuvaka uye sekuwedzera mune zvakasiyana zvigadzirwa. Kunyangwe vaine zvimwe zvakafanana, iwo akasiyana makomisheni ane akasiyana makemikari zvimiro, zvivakwa, uye mashandisirwo.
1.Chemical chimiro:
Starch ether:
Starch ethers inotorwa kubva kune starch, polysaccharide inoumbwa neglucose units. Iyo kemikari ye starch ine zvikamu zviviri zvikuru: amylose (mutsara maketani eglucose mamorekuru akabatanidzwa ne α-1,4-glycosidic bonds) uye amylopectin (ine α-1,4 uye α-1,6- Branched polymers ane glycosidic bonds. ) kuonana. Starch ethers inowanikwa nekugadzirisa mapoka ehydroxyl e starch kuburikidza ne etherification process.
Cellulose ether:
Cellulose, kune rumwe rutivi, imwe polysaccharide, asi chimiro chayo chinosanganisira zvikamu zveglucose zvakabatanidzwa ne β-1,4-glycosidic bonds. Cellulose ethers inotorwa kubva kune cellulose kuburikidza neyakafanana etherification process. Anodzokorora mayuniti mu cellulose akabatanidzwa nebeta bond, achigadzira mutsara uye yakanyanya crystalline chimiro.
2. Kwakabva:
Starch ether:
Starch inonyanya kubva muzvirimwa zvakaita sechibage, gorosi nembatatisi. Miti iyi matura e starch uye starch ethers inogona kutorwa nekugadziriswa.
Cellulose ether:
Cellulose ndiyo chikamu chikuru chechirimwa masero madziro uye inowanikwa zvakanyanya mumasikirwo. Zvinowanzowanikwa zve cellulose zvinosanganisira huni pulp, donje, uye akasiyana siyana emiti fiber. Cellulose ethers inogadzirwa nekugadzirisa cellulose mamorekuru anotorwa kubva kune aya masosi.
3. Etherification maitiro:
Starch ether:
Iyo etherification process ye starch inosanganisira kuunzwa kwemapoka ether mumapoka ehydroxyl (OH) aripo mumamorekuru estarch. Mapoka ether akajairwa akawedzerwa anosanganisira methyl, ethyl, hydroxyethyl, uye hydroxypropyl, zvichikonzera shanduko muzvimiro zvestarch yakagadziridzwa.
Cellulose ether:
Etherification ye cellulose inosanganisira maitiro akafanana ayo ether mapoka anounzwa mumapoka ehydroxyl e cellulose. Zvakajairwa cellulose ether derivatives zvinosanganisira methylcellulose, ethylcellulose, hydroxyethylcellulose uye carboxymethylcellulose.
4. Solubility:
Starch ether:
Starch ethers kazhinji ine mvura yakaderera kunyungudika pane cellulose ethers. Zvichienderana neboka reether rakanamirwa panguva yekugadziriswa, vanogona kuratidza madhigirii akasiyana ekunyungudika.
Cellulose ether:
Cellulose ethers inozivikanwa nokuda kwemvura-inonyungudika kana mvura-inopararira zvinhu. Solubility inoenderana nerudzi uye dhigirii rekutsiva ether.
5. Kuita firimu-kugadzira:
Starch ether:
Starch ethers kazhinji vane kushomeka kwekugadzira firimu nekuda kwechimiro chavo chesemi-crystalline. Iyo firimu inoguma inogona kunge isina kujeka uye isingachinjiki kupfuura mafirimu anogadzirwa kubva ku cellulose ethers.
Cellulose ether:
Cellulose ethers, kunyanya mamwe madhirivhiti akadai semethylcellulose, anozivikanwa nekunaka kwekugadzira firimu. Vanogona kugadzira mafirimu akajeka uye anoshanduka, achiita kuti ave akakosha mumashandisirwo akadai semajasi uye zvinonamatira.
6.Rheological properties:
Starch ether:
Starch ethers inogona kuwedzera viscosity yeaqueous solution, asi maitiro avo erheological anogona kusiyana ne cellulose ethers. Mhedzisiro pane viscosity zvinoenderana nezvinhu zvakaita sedhigirii rekutsiva uye huremu hwemamorekuru.
Cellulose ether:
Cellulose ethers anozivikanwa zvakanyanya nekuda kwemaitiro avo ekudzora rheology. Vanogona kukanganisa zvakanyanya viscosity, kuchengetedza mvura uye kuyerera zvivakwa mune akasiyana maapplication anosanganisira pendi, anonamira uye zvekuvaka.
7. Application:
Starch ether:
Starch ethers inogona kushandiswa mumaindasitiri ezvekudya, machira uye emishonga. Muindasitiri yekuvaka, anoshandiswa mumatope, mapurasita uye anonamira kuti awedzere zvivakwa zvakaita sekuchengetedza mvura uye kushanda.
Cellulose ether:
Cellulose ethers inoshandiswa zvakanyanya mumishonga, chikafu, cosmetics uye minda yekuvaka. Iwo anoshandiswa zvakanyanya seakobvu, stabilizer uye rheology modhifita mupendi, dhaka, mataira anonamira uye akasiyana magadzirirwo.
8. Biodegradability:
Starch ether:
Starch ethers inotorwa kubva muzvirimwa uye inowanzo ora. Vanobatsira kuwedzera kusimba kwezvigadzirwa zvinoshandiswa.
Cellulose ether:
Cellulose ethers inotorwa kubva kuchirimwa cellulose zvakare inoodza. Kuenderana kwavo kwezvakatipoteredza ndiyo mukana wakakosha mumashandisirwo uko kusimba kuri pamberi.
mukupedzisa:
Kunyange zvazvo starch ethers uye cellulose ethers vachigovana zvimwe zvakafanana sepolysaccharide derivatives, maitiro avo emakemikari akasiyana-siyana, zvitubu, kunyunguduka, firimu-kugadzira zvinhu, rheological maitiro uye mashandisirwo anozvitsaura kuti ashandiswe munzvimbo dzakasiyana-siyana. Starch ethers inotorwa kubva kune starch uye cellulose ethers inotorwa kubva muselulosi imwe neimwe ine zvakanakira zvakasiyana mumamiriro akasiyana. Kunzwisisa misiyano iyi kwakakosha pakusarudza iyo ether chaiyo kune chaiyo application, kuve nechokwadi chekuita kwakakwana uye hunhu hunodiwa.
Nguva yekutumira: Jan-25-2024