Ethyl cellulose(Ethyl cellulose ether), yomwe imadziwikanso kuti cellulose ether, yomwe imatchedwa EC.
Kapangidwe ka mamolekyulu ndi kapangidwe kake: [C6H7O2(OC2H5)3] n.
1. Kugwiritsa ntchito
Chogulitsachi chili ndi ntchito zomangira, kudzaza, kupanga filimu, ndi zina zotero. Chimagwiritsidwa ntchito popanga mapulasitiki opangidwa ndi utomoni, zokutira, zolowa m'malo mwa rabara, inki, zipangizo zotetezera kutentha, komanso chimagwiritsidwa ntchito ngati zomatira, zomaliza nsalu, ndi zina zotero, ndipo chingagwiritsidwe ntchito ngati zomatira za nyama mu ulimi ndi ulimi wa ziweto. Chowonjezera cha chakudya, chomwe chimagwiritsidwa ntchito ngati zomatira muzinthu zamagetsi ndi zotulutsira zankhondo.
2. Zofunikira zaukadaulo
Malinga ndi kagwiritsidwe ntchito kosiyanasiyana, EC yogulitsidwa ikhoza kugawidwa m'magulu awiri: kalasi yamafakitale ndi kalasi yamankhwala, ndipo nthawi zambiri imasungunuka mu zosungunulira zachilengedwe. Pa kalasi yamankhwala EC, muyezo wake wabwino uyenera kukwaniritsa miyezo ya Chinese Pharmacopoeia 2000 edition (kapena USP XXIV/NF19 edition ndi muyezo wa Japanese Pharmacopoeia JP).
3. Kapangidwe ka thupi ndi mankhwala
1. Maonekedwe: EC ndi ufa woyera kapena wopepuka wamadzimadzi a imvi, wopanda fungo.
2. Katundu: EC yogulitsidwa nthawi zambiri siisungunuka m'madzi, koma imasungunuka m'zinthu zosiyanasiyana zachilengedwe. Ili ndi kukhazikika kwabwino kwa kutentha, phulusa lochepa kwambiri likawotchedwa, ndipo nthawi zambiri silimamatira kapena silimva ngati lolimba. Imatha kupanga filimu yolimba. Imathabe kukhalabe yosinthasintha. Chogulitsachi si poizoni, chili ndi mphamvu zolimba zotsutsana ndi zamoyo, ndipo sichigwira ntchito bwino m'thupi, koma chimawonongeka mosavuta ndi kuwala kwa dzuwa kapena kuwala kwa ultraviolet. Pa EC yapadera, palinso mitundu yomwe imasungunuka mu lye ndi madzi oyera. Pa EC yokhala ndi digiri ya m'malo yoposa 1.5, ndi thermoplastic, yokhala ndi mfundo yofewa ya 135~155°C, mfundo yosungunuka ya 165~185°C, mphamvu yokoka ya 0.3~0.4 g/cm3, ndi kuchuluka kwa 1.07~1.18 g/cm3. Mlingo wa etherification wa EC umakhudza kusungunuka, kuyamwa kwa madzi, kalembedwe ka makina ndi kalembedwe ka kutentha. Pamene kuchuluka kwa etherification kukuwonjezeka, kusungunuka kwa lye kumachepa, pomwe kusungunuka kwa organic solvents kumawonjezeka. Kusungunuka m'zinthu zambiri zachilengedwe. Chosungunulira chomwe chimagwiritsidwa ntchito kwambiri ndi toluene/ethanol ngati 4/1 (kulemera) mixed solvent. Mlingo wa etherification umawonjezeka, malo ofewa ndi hygroscopicity zimachepa, ndipo kutentha kogwiritsidwa ntchito ndi -60°C~85°C. Mphamvu yolimba 13.7~54.9Mpa, voliyumu resistivity 10*e12~10*e14 ω.cm
Ethyl cellulose (DS: 2.3-2.6) ndi ether ya cellulose yosakhala ionic yomwe siisungunuka m'madzi koma imasungunuka mu organic solvents.
1.Sizosavuta kuyaka.
2. Kukhazikika kwa kutentha kwabwino komanso thermos-plasticity yabwino kwambiri.
3.Sisintha mtundu kukhala kuwala kwa dzuwa.
4. Kusinthasintha kwabwino.
5. Katundu wabwino wa dielectric.
6. Ili ndi kukana kwabwino kwa alkali komanso kukana asidi wofooka.
7.Kugwira ntchito bwino polimbana ndi ukalamba.
8. Kukana mchere wabwino, kukana kuzizira komanso kukana kuyamwa kwa chinyezi.
9. Ndi yokhazikika ku mankhwala ndipo siidzawonongeka ikasungidwa kwa nthawi yayitali.
10. Ikhoza kugwirizana ndi ma resin ambiri ndipo imagwirizana bwino ndi ma plasticizer onse.
11. N'zosavuta kusintha mtundu pansi pa malo amphamvu amchere komanso kutentha.
4. Njira yosungunula
Zosungunulira zosakaniza zomwe zimagwiritsidwa ntchito kwambiri pa ethyl cellulose (DS: 2.3 ~ 2.6) ndi aromatic hydrocarbons ndi alcohols. Aromatics ikhoza kukhala benzene, toluene, ethylbenzene, xylene, ndi zina zotero, ndi kuchuluka kwa 60-80%; alcohols ikhoza kukhala methanol, ethanol, ndi zina zotero, ndi kuchuluka kwa 20-40%. Pang'onopang'ono onjezerani EC mu chidebe chomwe chili ndi solvent yomwe ikusunthidwa mpaka itanyowa kwathunthu ndikusungunuka.
Nambala ya CAS: 9004-57-3
5. Kugwiritsa ntchito
Chifukwa cha kusasungunuka kwa madzi ake,ethyl celluloseimagwiritsidwa ntchito makamaka ngati chomangira mapiritsi ndi zinthu zokutira filimu, ndi zina zotero, ndipo ingagwiritsidwenso ntchito ngati choletsa zinthu za matrix kukonzekera mitundu yosiyanasiyana ya mapiritsi otulutsa matrix okhazikika;
Amagwiritsidwa ntchito ngati zinthu zosakaniza pokonzekera zophimbidwa ndi zotulutsa zokhazikika komanso zotulutsa zokhazikika;
Amagwiritsidwa ntchito ngati chinthu chothandizira chopangira ma microcapsules otulutsidwa nthawi zonse, kuti mphamvu ya mankhwalawa itulutsidwe mosalekeza ndikuletsa mankhwala ena osungunuka m'madzi kuti asagwire ntchito msanga;
Ingagwiritsidwenso ntchito ngati chosungunula, chokhazikika, komanso chosungira madzi m'njira zosiyanasiyana zoyezera mankhwala kuti apewe chinyezi ndi kuwonongeka kwa mankhwala ndikusunga bwino mapiritsi.
Nthawi yotumizira: Epulo-28-2024