Ethyl cellulose(Ethyl cellulose ether), tseem hu ua cellulose ether, hu ua EC.
Cov qauv molecular thiab cov qauv formula: [C6H7O2(OC2H5)3] n.
1. Siv
Cov khoom no muaj cov haujlwm ntawm kev sib txuas, kev sau, kev tsim zaj duab xis, thiab lwm yam. Nws yog siv rau cov yas hluavtaws resin, coatings, roj hmab hloov, inks, cov ntaub ntawv insulating, thiab kuj siv ua cov nplaum, cov neeg sawv cev tiav textile, thiab lwm yam, thiab tuaj yeem siv ua tsiaj hauv kev ua liaj ua teb thiab kev yug tsiaj pub additive, siv ua nplaum hauv cov khoom siv hluav taws xob thiab cov tub rog propellants.
2. Cov kev cai lij choj
Raws li kev siv sib txawv, EC lag luam tuaj yeem muab faib ua ob pawg: qib kev lag luam thiab qib tshuaj, thiab feem ntau yaj tau hauv cov kuab tshuaj organic. Rau qib tshuaj EC, nws cov qauv zoo yuav tsum ua tau raws li cov qauv ntawm Suav Pharmacopoeia 2000 tsab (lossis USP XXIV / NF19 tsab thiab Japanese Pharmacopoeia JP tus qauv).
3. Cov khoom siv lub cev thiab tshuaj lom neeg
1. Tsos: EC yog dawb los yog lub teeb grey kua hmoov, tsis muaj ntxhiab.
2. Cov Khoom: EC lag luam feem ntau tsis yaj hauv dej, tab sis yaj hauv cov kuab tshuaj sib txawv. Nws muaj kev ruaj khov zoo thermal, cov tshauv tsawg heev thaum hlawv, thiab tsis tshua lo lossis xav tias astringent. Nws tuaj yeem tsim ib zaj duab xis tawv. Nws tseem tuaj yeem tswj tau qhov yooj ywm. Cov khoom no tsis muaj tshuaj lom, muaj cov khoom tiv thaiv kab mob muaj zog, thiab yog metabolically inert, tab sis nws yooj yim rau oxidative degradation hauv qab lub hnub ci lossis lub teeb ultraviolet. Rau cov hom phiaj tshwj xeeb EC, kuj muaj cov hom uas yaj hauv lye thiab dej ntshiab. Rau EC nrog qib hloov pauv saum toj no 1.5, nws yog thermoplastic, nrog lub ntsiab lus softening ntawm 135 ~ 155 ° C, lub ntsiab lus melting ntawm 165 ~ 185 ° C, lub zog pseudo tshwj xeeb ntawm 0.3 ~ 0.4 g / cm3, thiab qhov ceev ntawm 1.07 ~ 1.18 g / cm3. Qib ntawm etherification ntawm EC cuam tshuam rau solubility, dej nqus, cov khoom siv kho tshuab thiab cov khoom thermal. Raws li qib ntawm etherification nce, qhov solubility hauv lye txo qis, thaum qhov solubility hauv cov organic solvents nce. Soluble hauv ntau cov organic solvents. Cov kuab tshuaj siv feem ntau yog toluene / ethanol ua 4/1 (qhov hnyav) sib xyaw solvent. Qib ntawm etherification nce, qhov softening point thiab hygroscopicity txo qis, thiab kev siv kub yog -60 ° C ~ 85 ° C. Tensile zog 13.7 ~ 54.9Mpa, ntim resistivity 10 * e12 ~ 10 * e14 ω.cm
Ethyl cellulose (DS: 2.3-2.6) yog ib qho non-ionic cellulose ether uas tsis yaj hauv dej tab sis yaj hauv cov organic solvents.
1. Tsis yooj yim hlawv.
2. Zoo thermal stability thiab zoo heev thermos-plasticity.
3. Tsis hloov xim rau lub hnub ci.
4. Kev ywj pheej zoo.
5. Cov khoom siv dielectric zoo.
6. Nws muaj kev tiv thaiv alkali zoo heev thiab tsis muaj zog acid.
7. Kev ua haujlwm zoo tiv thaiv kev laus.
8. Zoo tiv taus ntsev, tiv taus txias thiab tsis kam nqus dej noo.
9. Nws ruaj khov rau cov tshuaj lom neeg thiab yuav tsis lwj hauv kev khaws cia mus sij hawm ntev.
10. Nws tuaj yeem sib xws nrog ntau cov resins thiab muaj kev sib haum xeeb zoo nrog txhua tus plasticizers.
11. Nws yooj yim hloov xim nyob rau hauv qhov chaw muaj zog alkaline thiab cua sov.
4. Txoj kev yaj
Cov tshuaj sib xyaw ua ke feem ntau siv rau ethyl cellulose (DS: 2.3 ~ 2.6) yog cov aromatic hydrocarbons thiab cawv. Cov aromatics tuaj yeem yog benzene, toluene, ethylbenzene, xylene, thiab lwm yam, nrog rau qhov ntau ntawm 60-80%; cawv tuaj yeem yog methanol, ethanol, thiab lwm yam, nrog rau qhov ntau ntawm 20-40%. Maj mam ntxiv EC rau hauv lub thawv uas muaj cov tshuaj yaj hauv qab do kom txog thaum nws ntub tag thiab yaj.
CAS No.: 9004-57-3
5. Daim Ntawv Thov
Vim nws cov dej tsis yaj,ethyl cellulosefeem ntau yog siv los ua cov ntawv nplaum ntsiav tshuaj thiab cov khoom siv txheej txheej zaj duab xis, thiab lwm yam, thiab kuj tseem siv tau ua cov khoom siv matrix blocker los npaj ntau hom matrix sustained-release ntsiav tshuaj;
Siv ua cov khoom sib xyaw los npaj cov tshuaj coated sustained-release preparations thiab sustained-release pellets;
Nws yog siv los ua cov khoom siv encapsulation los npaj cov microcapsules uas tso tawm tas mus li, yog li ntawd cov tshuaj tuaj yeem tso tawm tas mus li thiab tiv thaiv qee cov tshuaj uas yaj hauv dej kom tsis txhob ua haujlwm ua ntej lub sijhawm;
Nws kuj tseem siv tau ua tus neeg faib cov tshuaj, tus neeg ruaj khov, thiab tus neeg sawv cev khaws dej hauv ntau hom tshuaj kom tiv thaiv cov dej noo thiab kev puas tsuaj ntawm cov tshuaj thiab txhim kho kev khaws cia cov ntsiav tshuaj kom muaj kev nyab xeeb.
Lub sijhawm tshaj tawm: Plaub Hlis-28-2024