Ingancin Hydroxypropyl Methyl Cellulose

Ana tsabtace Hydroxypropyl methylcellulose daga auduga bayan alkalization, ta yin amfani da propylene oxide da methyl chloride a matsayin etherification jamiái, da kuma jurewa jerin halayen don samar da wadanda ba ionic cellulose gauraye ether. Hydroxypropyl methylcellulose shine ether cellulose maras ionic, fari a bayyanar, mara wari kuma maras ɗanɗano. Matsayin musanyawa gabaɗaya . Kaddarorinsa sun bambanta dangane da rabon abun ciki na methoxyl zuwa abun ciki na hydroxypropyl.

Da farko, da farko ku dubi haɗin hydroxypropyl methylcellulose:

Ana kula da cellulose mai ladabi auduga tare da bayani na alkali a 35-40 ° C na rabin sa'a, danna shi, kuma an lalatar da cellulose a 35 ° C kuma ya tsufa sosai, don haka matsakaicin digiri na polymerization na fiber alkali da aka samu yana cikin kewayon da ake buƙata. Saka alkali fiber a cikin tanki na etherification, ƙara propylene oxide da methyl chloride a jere, etherify a 50-80 ° C na 5 hours, kuma matsakaicin matsa lamba shine kimanin. Sa'an nan kuma ƙara daidai adadin hydrochloric acid da oxalic acid zuwa ruwan zafi a 90 ° C don faɗaɗa ƙarar. Dehydrate a cikin centrifuge. Lokacin da danshi na kayan ya kasance ƙasa da 60%, wanke shi zuwa tsaka tsaki, sa'an nan kuma bushe shi zuwa ƙasa da 5% tare da iska mai zafi a 130 ° C. A ƙarshe an fasa shi ta hanyar raƙuman raƙuman ruwa 20 don samun samfurin da aka gama.

Siffofin Samfura na Hydroxypropyl Methyl Cellulose:

1. Hydroxypropyl methylcellulose yana da sauƙin narkewa a cikin ruwan sanyi kuma zai narke cikin ruwan zafi. Duk da haka, zafinsa na gelation a cikin ruwan zafi yana da girma fiye da na methylcellulose. Har ila yau, rushewa a cikin ruwan sanyi yana inganta sosai akan methyl cellulose.

2. Danko na hydroxypropyl methylcellulose yana da alaƙa da nauyin kwayoyin halitta, kuma danko yana da girma lokacin da nauyin kwayoyin ya girma. Hakanan yanayin zafi yana rinjayar danko, yayin da zafin jiki ya karu, danko yana raguwa. Amma babban dankonsa ya yi ƙasa da methyl cellulose. Maganin sa yana da ƙarfi a cikin zafin jiki.

Ƙarfin ajiyar ruwa na hydroxypropyl methylcellulose ya dogara ne akan adadin adadinsa, danko, da dai sauransu, kuma yawan ajiyar ruwa ya fi na methyl cellulose.

3. Hydroxypropyl methylcellulose yana da kwanciyar hankali ga acid da alkali, kuma maganinsa mai ruwa ya tsaya a cikin kewayon pH = 2-12. Caustic soda da ruwan lemun tsami suna da ɗan tasiri akan kaddarorin sa, amma alkali na iya hanzarta rushewar kuma ɗan ƙara ɗanɗanonta. Hydroxypropyl methylcellulose ya tsaya tsayin daka ga gishiri na kowa, amma lokacin da maida hankali na maganin gishiri ya yi girma, dankowar maganin hydroxypropyl methylcellulose yakan ƙara ƙaruwa.

4. Hydroxypropyl methylcellulose za a iya haxa shi da ruwa mai narkewa polymers don samar da uniform, high-danko bayani. Kamar polyvinyl barasa, tafkin ruwa foda ether, kayan lambu danko, da dai sauransu.

Hydroxypropyl methylcellulose yana da mafi kyawun juriya na enzyme fiye da methylcellulose, kuma maganinsa ba shi da yuwuwar lalatawar enzymatically fiye da methylcellulose.

5. Adhesion tsakanin hydroxypropyl methylcellulose da turmi tsarin ya fi na methylcellulose.

Tumi da aka haɗe da rigar shine siminti, tara mai kyau, ƙari da ruwa, kuma an ƙayyade sassa daban-daban bisa ga aikin. Bayan an auna cakuduwar sannan a gauraya ta wani ma'auni a wurin da ake hadawa, sai a kai gadar zuwa wurin da za a yi amfani da ita ta wata babbar mota da za a adana ta a cikin wani akwati na musamman, sannan a yi amfani da ruwan dattin cikin kayyadadden lokaci.

Yadda za a yi hukunci da ingancin hydroxypropyl methylcellulose?

Yin la'akari da ingancin hydroxypropyl methylcellulose ya dogara ne akan alamomi guda biyu, ɗaya shine matakin maye gurbin (DS) ɗayan kuma shine tsarki. Gabaɗaya, kaddarorin carboxymethyl cellulose sun bambanta idan matakin maye gurbin ya bambanta; mafi girman matakin maye gurbin, mafi ƙarfi da ƙarfi, kuma mafi kyawun nuna gaskiya da kwanciyar hankali na mafita. Dangane da rahotanni masu dacewa, nuna gaskiya na carboxymethyl cellulose yana da kyau idan aka kwatanta da matakin maye gurbin ~, kuma danko na maganin ruwa yana da girma lokacin da darajar pH ta kasance 6-9. Wato don auna ingancin carboxymethyl cellulose, wajibi ne a sami kyakkyawar fahimtar matakin maye gurbinsa da tsarkinsa. Wadannan alamomi guda biyu sun cika bukatun, wanda ke nufin cewa ingancinsa yana da kyau sosai.