Starch ether thiab cellulose ether yog ob hom ether derivatives siv nyob rau hauv ntau yam lag luam, tshwj xeeb tshaj yog nyob rau hauv kev tsim kho thiab txheej. Thaum lawv qhia qee qhov zoo sib xws ntawm kev ua dej-soluble polymers nrog thickening thiab stabilizing zog, muaj qhov sib txawv ntawm lawv, feem ntau hauv lawv qhov chaw thiab cov qauv tshuaj.
Starch Ether:
1. Qhov chaw:
- Ntuj Keeb Kwm: Cov hmoov txhuv nplej siab ether yog muab los ntawm cov hmoov txhuv nplej siab, uas yog cov carbohydrate muaj nyob hauv cov nroj tsuag. Cov hmoov txhuv nplej siab feem ntau muab rho tawm los ntawm cov qoob loo xws li pob kws, qos yaj ywm, lossis cassava.
2. Chemical Structure:
- Polymer Composition: Starch yog ib qho polysaccharide uas muaj cov piam thaj txuas los ntawm glycosidic bonds. Starch ethers yog hloov pauv derivatives ntawm starch, qhov twg hydroxyl pawg ntawm cov hmoov txhuv nplej siab yog hloov nrog ether pawg.
3. Kev siv:
- Kev Lag Luam Kev Tsim Kho: Cov hmoov txhuv nplej siab ethers feem ntau siv hauv kev tsim kho kev lag luam ua cov khoom ntxiv hauv cov khoom siv gypsum, mortars, thiab cov khoom siv cement. Lawv pab txhawb kev txhim kho kev ua haujlwm, tuav dej, thiab adhesion.
4. Hom Hom:
- Hydroxyethyl Starch (HES): Ib hom hmoov txhuv nplej siab ether yog hydroxyethyl starch, qhov twg hydroxyethyl pawg tau qhia los hloov cov hmoov txhuv nplej siab.
Cellulose Ether:
1. Qhov chaw:
- Ntuj Keeb Kwm: Cellulose ether yog muab los ntawm cellulose, ib tug natural polymer pom nyob rau hauv lub cell phab ntsa ntawm cov nroj tsuag. Nws yog ib qho tseem ceeb ntawm cov phab ntsa ntawm cov nroj tsuag thiab yog muab rho tawm los ntawm qhov chaw xws li ntoo pulp los yog paj rwb.
2. Chemical Structure:
- Polymer Composition: Cellulose yog cov kab hluav taws xob uas muaj cov piam thaj txuas los ntawm β-1,4-glycosidic bonds. Cellulose ethers yog derivatives ntawm cellulose, qhov twg hydroxyl pawg ntawm cellulose molecule raug hloov nrog ether pawg.
3. Kev siv:
- Kev Lag Luam Kev Tsim Kho: Cellulose ethers pom dav siv hauv kev tsim kho kev lag luam, zoo ib yam li cov hmoov txhuv nplej siab ethers. Lawv siv hauv cov khoom siv cement, pobzeb adhesives, thiab mortars los txhim kho cov dej tuav, kev ua haujlwm, thiab adhesion.
4. Hom Hom:
- Hydroxyethyl Cellulose (HEC): Ib hom cellulose ether yog hydroxyethyl cellulose, qhov twg hydroxyethyl pawg tau qhia los hloov cov qauv cellulose.
- Methyl Cellulose (MC): Lwm hom yog methyl cellulose, qhov twg methyl pawg tau qhia.
Qhov txawv tseem ceeb:
1. Qhov chaw:
- Starch ether yog muab los ntawm cov hmoov txhuv nplej siab, ib qho carbohydrate pom hauv cov nroj tsuag.
- Cellulose ether yog muab los ntawm cellulose, ib feem tseem ceeb ntawm cov phab ntsa ntawm cov nroj tsuag.
2. Chemical Structure:
- Lub hauv paus polymer rau cov hmoov txhuv nplej siab ether yog cov hmoov txhuv nplej siab, polysaccharide tsim los ntawm cov piam thaj.
- Lub hauv paus polymer rau cellulose ether yog cellulose, linear polymer tsim los ntawm cov piam thaj units.
3. Kev siv:
- Ob hom ethers yog siv nyob rau hauv kev tsim kho kev lag luam, tab sis cov kev siv tshwj xeeb thiab cov qauv yuav txawv.
4. Hom Hom:
- Hydroxyethyl starch (HES) thiab hydroxyethyl cellulose (HEC) yog cov piv txwv ntawm cov ether derivatives.
Thaum cov hmoov txhuv nplej siab ether thiab cellulose ether yog ob qho tib si dej-soluble polymers siv los ua additives hauv ntau daim ntawv thov, lawv qhov chaw, hauv paus polymer, thiab cov qauv tshuaj tshwj xeeb txawv. Cov kev sib txawv no tuaj yeem cuam tshuam lawv cov kev ua tau zoo hauv cov qauv tsim thiab kev siv.
Post lub sij hawm: Jan-06-2024