Hydroxyethyl cellulose (HEC) ne mai muhimmanci ruwa-soluble cellulose ether, wanda aka yadu amfani a coatings, man hakowa, Pharmaceuticals da sauran filayen. Matsayinsa na narkewa shine muhimmin ma'aunin jiki wanda ke shafar sarrafa shi da amfaninsa. Abubuwan da ke tasiri wurin narkewar hydroxyethyl cellulose za a iya raba su zuwa bangarori da yawa, kamar tsarin kwayoyin halitta, matakin maye gurbin, nauyin kwayoyin halitta, crystallinity, ƙazanta, da yanayin muhalli.
1. Tsarin kwayoyin halitta
Hydroxyethyl cellulose shine samfurin cellulose bayan ethoxylation. Tsarinsa na asali shine cewa atom ɗin hydrogen da ke cikin ƙwayoyin cellulose ana maye gurbinsu da ƙungiyoyin hydroxyethyl. Matsayi, lamba da tsari na maye gurbin hydroxyethyl zai shafi wurin narkewa.
Matsayin musanya: Kowace rukunin glucose a cikin cellulose yana da ƙungiyoyin hydroxyl guda uku waɗanda za a iya musanya su. Sauyawa a wurare daban-daban zai canza tsarin sararin samaniya na kwayoyin halitta, ta haka zai shafi wurin narkewa.
Adadin abubuwan da aka maye gurbinsu: Ƙaruwa a cikin adadin masu maye gaba ɗaya yana rage haɗin gwiwar hydrogen tsakanin kwayoyin halitta, ta haka yana rage ma'anar narkewa.
Tsarin tsari na maye gurbin: Abubuwan da aka rarraba ba da gangan ba da kuma masu maye gurbin da ake rarrabawa akai-akai suna da tasiri daban-daban akan sassauƙa da hulɗar sarkar kwayoyin halitta, don haka suna tasiri wurin narkewa.
2. Digiri na Sauya (DS)
DS yana nufin matsakaicin adadin abubuwan maye gurbin hydroxyethyl akan kowace rukunin glucose. Matsayin maye gurbin yana da tasiri mai mahimmanci akan wurin narkewa, wanda aka fi nunawa a cikin abubuwan da ke biyowa:
Ƙananan DS: A ƙananan DS, haɗin gwiwar hydrogen tsakanin kwayoyin halitta na hydroxyethyl cellulose ya fi karfi, yana sa kwayoyin sun fi ɗaure sosai kuma wurin narkewa mafi girma.
Babban DS: Babban DS yana ƙara sassauƙar ƙwayoyin ƙwayoyin cuta kuma yana rage tasirin haɗin gwiwar hydrogen, yana sa ƙwayoyin cuta su sauƙaƙe don zamewa kuma wurin narkewa ƙasa.
3. Nauyin Kwayoyin Halitta
Nauyin kwayoyin halitta yana da tasiri kai tsaye akan wurin narkewa na hydroxyethyl cellulose. Gabaɗaya magana, girman nauyin kwayoyin halitta, mafi tsayin sarkar kwayoyin, ƙarfin van der Waals yana da ƙarfi tsakanin kwayoyin, kuma mafi girma wurin narkewa. Bugu da ƙari, nisa na rarraba nauyin kwayoyin halitta zai kuma shafi ma'anar narkewa, kuma rarrabawa mai yawa na iya haifar da maki masu narkewa marasa daidaituwa.
Maɗaukakin nauyin kwayoyin halitta: Sarƙoƙin kwayoyin sun fi tsayi, sun fi haɗuwa da juna, kuma wurin narkewa yana da girma.
Ƙananan nauyin kwayoyin halitta: Sarƙoƙi na kwayoyin sun fi guntu, dakarun intermolecular sun fi rauni, kuma wurin narkewa yana da ƙasa.
4. Crystallinity
Hydroxyethyl cellulose shine polymer amorphous, amma yana iya samun wasu wuraren crystalline. Kasancewar yankuna crystalline yana ƙaruwa da narkewa saboda tsarin crystalline yana da ƙarfi kuma yana buƙatar ƙarin makamashi don karya waɗannan tsarin da aka ba da umarni. Matsayin hydroxyethylation da yanayin tsari yana rinjayar crystallinity.
High crystallinity: m tsarin, mafi girma narkewa batu.
Low crystallinity: sako-sako da tsarin, ƙananan narkewa.
5. Najasa
A lokacin aikin samar da hydroxyethyl cellulose, wasu albarkatun da ba a yi amfani da su ba, masu kara kuzari ko samfurori na iya zama. Kasancewar waɗannan ƙazanta na iya canza ƙarfin intermolecular, ta haka ya shafi wurin narkewa. Misali:
Residual catalyst: za a iya ƙirƙirar hadaddun, canza wurin narkewa.
Ta hanyar samfurori: Kasancewar nau'i-nau'i daban-daban za su canza hulɗar tsarin kuma suna tasiri wurin narkewa.
6. Yanayin muhalli
Yanayin muhalli kamar zafin jiki da zafi kuma zai shafi wurin narkewar hydroxyethyl cellulose. A karkashin yanayin zafi mai zafi, hydroxyethyl cellulose zai sha filastik bayan shayar da ruwa, wanda zai raunana karfin intermolecular kuma ya rage wurin narkewa.
Babban zafin jiki: Yana iya haifar da bazuwar kayan zafi da faɗaɗa wurin narkewa.
Babban zafi: Sarkar kwayoyin sun fi sassauƙa bayan shayar da ruwa, kuma wurin narkewa yana raguwa.
7. Fasahar sarrafawa
Yanayin zafin jiki, ƙarfin ƙarfi, yanayin bushewa, da dai sauransu yayin aikin sarrafawa zai shafi wurin narkewa na samfurin ƙarshe. Yanayin sarrafawa daban-daban za su haifar da nau'i-nau'i daban-daban na kwayoyin halitta da crystallinity, wanda hakan ya shafi yanayin narkewa.
Zazzabi mai sarrafawa: Maɗaukakin yanayin zafi na sarrafawa na iya haifar da ɓarna ko haɗin kai, canza wurin narkewa.
Yanayin bushewa: bushewa da sauri da bushewa a hankali suna da tasiri daban-daban akan tsarin kwayoyin halitta, kuma wurin narkewa kuma zai bambanta.
A taƙaice, abubuwan da suka shafi wurin narkewa na hydroxyethyl cellulose sun haɗa da tsarin kwayoyin halitta, digiri na maye gurbin, nauyin kwayoyin halitta, crystallinity, ƙazanta, yanayin muhalli da fasaha na sarrafawa. Don aikace-aikacen aikace-aikacen da aiki, kulawa mai ma'ana na waɗannan abubuwan na iya haɓaka aikin hydroxyethyl cellulose kuma ya sa ya fi dacewa da buƙatun aikace-aikacen daban-daban. A cikin tsarin samarwa, gyare-gyaren kimiyya na waɗannan sigogi ba zai iya sarrafa wurin narkewar samfurin kawai ba, amma har ma inganta kwanciyar hankali da ingancin samfurin.
Lokacin aikawa: Yuli-10-2024