Cellulose ethers ne iri-iri na ruwa-soluble polymers samu daga cellulose, wani halitta polymer samu a shuka cell ganuwar.Wadannan ethers suna da kaddarorin musamman irin su kauri, daidaitawa, yin fim, da riƙe ruwa, kuma ana amfani da su sosai a masana'antu daban-daban kamar su magani, abinci, kayan kwalliya, da gini.Daga cikin ethers cellulose, hydroxyethyl cellulose (HEC) da hydroxypropyl methylcellulose (HPMC) sune mahimman abubuwan haɓaka guda biyu, kowannensu yana da kaddarorin da aikace-aikace daban-daban.
1. Gabatarwa ga cellulose ethers
A. Tsarin Cellulose da Abubuwan Samfura
Bayanin cellulose:
Cellulose shine polymer madaidaiciya wanda ya ƙunshi raka'o'in glucose wanda ke da alaƙa da haɗin β-1,4-glycosidic.
Yana da wadata a ganuwar tantanin halitta kuma yana ba da tallafi na tsari da rigidity ga kyallen takarda.
Abubuwan da aka samo asali na Cellulose ether:
Ana samun ethers na cellulose daga cellulose ta hanyar gyaran sinadaran.
An gabatar da ethers don ƙara yawan solubility da canza kayan aiki.
2. Hydroxyethylcellulose (HEC)
A. Tsari da kira
Tsarin sinadaran:
Ana samun HEC ta hanyar etherification na cellulose tare da ethylene oxide.
Ƙungiyoyin Hydroxyethyl suna maye gurbin ƙungiyoyin hydroxyl a cikin tsarin cellulose.
Matsayin canji (DS):
DS yana nufin matsakaicin adadin ƙungiyoyin hydroxyethyl a kowace naúrar anhydroglucose.
Yana rinjayar solubility, danko da sauran kaddarorin HEC.
B. Yanayi
Solubility:
HEC yana narkewa a cikin ruwan sanyi da ruwan zafi, yana ba da sassaucin aikace-aikacen.
Dankowa:
A matsayin mai gyaran gyare-gyare na rheology, yana rinjayar kauri da kwararar maganin.
Ya bambanta da DS, maida hankali da zafin jiki.
Samuwar fim:
Yana samar da fim mai haske tare da kyakkyawan mannewa.
C. Aikace-aikace
magani:
Ana amfani dashi azaman mai kauri a cikin nau'ikan nau'ikan nau'ikan ruwa.
Inganta danko da kwanciyar hankali na saukad da ido.
Paints da Rubutun:
Yana haɓaka danko kuma yana ba da kyawawan kaddarorin kauri.
Inganta fenti da kwanciyar hankali.
Kayayyakin kula da mutum:
An samo shi a cikin shamfu, creams da lotions azaman mai kauri da mai daidaitawa.
Yana ba da laushi mai laushi ga kayan shafawa.
3. Hydroxypropylmethylcellulose (HPMC)
A. Tsari da kira
Tsarin sinadaran:
An haɗa HPMC ta maye gurbin ƙungiyoyin hydroxyl tare da ƙungiyoyin methoxy da hydroxypropyl.
Etherification yana faruwa ta hanyar amsawa tare da propylene oxide da methyl chloride.
Methoxy da hydroxypropyl maye gurbin:
Ƙungiyar methoxy tana ba da gudummawa ga solubility, yayin da ƙungiyar hydroxypropyl ke shafar danko.
B. Yanayi
Thermal gelation:
Yana nuna gelation mai jujjuyawar thermal, samar da gels a yanayin zafi.
Ana iya amfani da shi don sarrafawar sakin magunguna shirye-shiryen.
Riƙewar ruwa:
Kyakkyawan ikon riƙe ruwa, yana sa ya dace da aikace-aikacen gini.
Ayyukan saman:
Yana nuna kaddarorin masu kama da surfactant don taimakawa daidaita emulsions.
C. Aikace-aikace
Masana'antar gine-gine:
An yi amfani da shi azaman wakili mai riƙe ruwa a cikin turmi na tushen siminti.
Yana inganta iya aiki da mannewa na tile adhesives.
magani:
Yawanci ana amfani da shi a cikin shirye-shiryen magunguna na baka da na Topical.
Yana sauƙaƙe sakin magunguna da aka sarrafa saboda iyawar sa na gel.
masana'antar abinci:
Yana aiki azaman thickener da stabilizer a abinci.
Yana ba da ingantaccen rubutu da jin bakin baki a wasu aikace-aikace.
4. Kwatanta bincike
A. Bambance-bambance a cikin kira
HEC da HPMC kira:
Ana samar da HEC ta hanyar amsa cellulose tare da ethylene oxide.
Haɗin HPMC ya ƙunshi maye gurbin methoxy da ƙungiyoyin hydroxypropyl sau biyu.
B. Bambance-bambancen aiki
Solubility da danko:
HEC yana narkewa a cikin ruwan sanyi da ruwan zafi, yayin da solubility na HPMC ya shafi abun ciki na ƙungiyar methoxy.
HEC gabaɗaya yana nuna ƙananan danko idan aka kwatanta da HPMC.
Halin gel:
Ba kamar HPMC ba, wanda ke samar da gels masu jujjuyawa, HEC ba ta yin amfani da gelation na thermal.
C. Bambance-bambance a aikace
Riƙewar ruwa:
An fi son HPMC don aikace-aikacen gini saboda kyawawan kaddarorin riƙon ruwa.
Ikon shirya fim:
HEC yana samar da fina-finai masu tsabta tare da mannewa mai kyau, yana sa ya dace da wasu aikace-aikace inda ƙirƙirar fim yana da mahimmanci.
5 Kammalawa
A taƙaice, hydroxyethyl cellulose (HEC) da hydroxypropyl methylcellulose (HPMC) sune mahimmancin ethers cellulose tare da kaddarorin musamman da aikace-aikace.Siffar sinadarai na musamman, hanyoyin hadawa, da kaddarorin aiki sun sa su zama masu iya aiki a masana'antu daban-daban.Fahimtar bambance-bambance tsakanin HEC da HPMC na iya taimaka muku yanke shawara mai fa'ida yayin zabar ether mai dacewa don takamaiman aikace-aikacen, ko a cikin magunguna, gini, fenti ko samfuran kulawa na sirri.Yayin da fasaha ke ci gaba da kimiyya, ƙarin bincike na iya bayyana ƙarin aikace-aikace da gyare-gyare, ta yadda za a haɓaka amfanin waɗannan ethers na cellulose a fannoni daban-daban.
Lokacin aikawa: Dec-11-2023