Cellulose ether wani muhimmin nau'i ne na mahadi na polymer, wanda aka yi amfani dashi sosai a gine-gine, magani, abinci da sauran fannoni. Daga cikin su, HPMC (hydroxypropyl methylcellulose), MC (methylcellulose), HEC (hydroxyethyl cellulose) da CMC (carboxymethyl cellulose) ne hudu na kowa cellulose ethers.
Methyl cellulose (MC):
MC yana narkewa cikin ruwan sanyi kuma yana da wahalar narkewa cikin ruwan zafi. Maganin ruwa mai ruwa yana da tsayi sosai a cikin kewayon pH = 3 ~ 12, yana da dacewa mai kyau, kuma ana iya haɗe shi da nau'in surfactants irin su sitaci da guar danko. Lokacin da zafin jiki ya kai ga zafin jiki na gelation, gelation yana faruwa.
Riƙewar ruwa na MC ya dogara da ƙarin adadin sa, danko, fineness barbashi da adadin rushewa. Gabaɗaya, ƙimar riƙewar ruwa yana da girma lokacin da adadin ƙari ya yi girma, ɓangarorin suna da kyau kuma danko yana da girma. Daga cikin su, adadin ƙarawa yana da tasiri mafi girma akan yawan ajiyar ruwa, kuma matakin danko bai dace da adadin ruwa ba. A rushe kudi yafi dogara a kan surface gyara digiri da barbashi fineness na cellulose barbashi.
Canje-canjen yanayin zafi zai yi tasiri sosai akan riƙe ruwa na MC. Gabaɗaya, mafi girman zafin jiki, mafi munin riƙewar ruwa. Idan zafin turmi ya wuce 40 ° C, za a rage yawan riƙe ruwa na MC sosai, yana tasiri sosai ga aikin ginin turmi.
MC yana da tasiri mai mahimmanci akan aikin ginin da mannewa na turmi. Anan, “maɗaukaki” yana nufin mannewa tsakanin kayan aikin ginin ma’aikaci da katangar bango, wato juriyar juriyar turmi. Mafi girman mannewa, mafi girman juriyar juriya na turmi, mafi girman ƙarfin da ma'aikaci ke buƙata yayin amfani da shi, da ƙarancin aikin ginin turmi. Adhesion na MC yana cikin matsakaiciyar matsakaici tsakanin samfuran ether cellulose.
Hydroxypropyl methylcellulose (HPMC):
HPMC yana da sauƙin narkewa a cikin ruwa, amma yana iya zama da wahala a narke cikin ruwan zafi. Duk da haka, zafinsa na gelation a cikin ruwan zafi yana da girma fiye da na MC, kuma solubility a cikin ruwan sanyi ma ya fi na MC.
Dankowar HPMC yana da alaƙa da nauyin kwayoyin halitta, kuma danko yana da girma lokacin da nauyin kwayoyin ya girma. Har ila yau yanayin zafi yana rinjayar danko, kuma danko yana raguwa yayin da zafin jiki ya karu, amma yanayin zafi da danko ya ragu ya fi na MC. Maganin sa yana da ƙarfi a cikin zafin jiki.
Riƙewar ruwa na HPMC ya dogara da ƙarin adadin da danko, da dai sauransu. Adadin ajiyar ruwa a daidai adadin adadin ya fi na MC.
HPMC yana da kwanciyar hankali ga acid da alkalis, kuma maganin sa na ruwa yana da ƙarfi sosai a cikin kewayon pH na 2 ~ 12. Caustic soda da ruwan lemun tsami suna da ɗan tasiri akan aikin sa, amma alkali na iya haɓaka ƙimar rushewar sa kuma yana ƙara danko. HPMC ya tsaya tsayin daka ga gishiri na gabaɗaya, amma lokacin da maida hankali na maganin gishiri ya yi girma, dankowar maganin HPMC yana ƙara ƙaruwa.
Ana iya haxa HPMC tare da mahaɗan polymer mai narkewa da ruwa don samar da uniform, mafi girman maganin danko, kamar polyvinyl barasa, sitaci ether, danko, da sauransu.
HPMC yana da mafi kyawun juriya na enzyme fiye da MC, kuma maganin sa ba shi da sauƙi ga lalatawar enzymatic fiye da MC. HPMC yana da mafi kyawun mannewa zuwa turmi fiye da MC.
Hydroxyethyl cellulose (HEC):
HEC yana narkewa a cikin ruwan sanyi kuma yana da wahalar narkewa a cikin ruwan zafi. Maganin yana da kwanciyar hankali a babban zafin jiki kuma ba shi da kayan gel. Ana iya amfani da shi a cikin turmi na dogon lokaci a yanayin zafi mai yawa, amma riƙewar ruwa ya fi MC.
HEC ne barga ga janar acid da alkalis, alkali iya hanzarta ta rushe da dan kadan kara danko, da dispersibility a cikin ruwa ne dan kadan kasa da MC da HPMC.
HEC yana da kyakkyawan aikin dakatarwa don turmi, amma simintin yana da ɗan jinkirin lokaci.
HEC da wasu kamfanoni na cikin gida ke samarwa yana da ƙarancin aiki fiye da na MC saboda yawan ruwa da kuma toka.
Carboxymethyl cellulose (CMC):
CMC shine ether cellulose ionic wanda aka shirya ta jerin jiyya na amsawa bayan an yi amfani da filaye na halitta (kamar auduga) tare da alkali kuma ana amfani da acid chloroacetic azaman wakili na etherifying. Matsayin musanyawa gabaɗaya yana tsakanin 0.4 da 1.4, kuma matakin maye gurbin aikinsa yana tasiri sosai.
CMC yana da kauri da emulsification stabilization effects, kuma za a iya amfani da a cikin abubuwan sha dauke da man fetur da kuma gina jiki a yi wani emulsification stabilization rawa.
CMC yana da tasirin riƙe ruwa. A cikin kayan nama, burodi, busassun busassun da sauran abinci, zai iya taka rawa wajen inganta nama, kuma zai iya sa ruwa ya ragu, ƙara yawan amfanin ƙasa, da ƙara dandano.
CMC yana da tasirin gelling kuma ana iya amfani dashi don yin jelly da jam.
CMC na iya samar da fim a saman abinci, wanda ke da tasirin kariya ga 'ya'yan itatuwa da kayan marmari kuma yana tsawaita rayuwar 'ya'yan itatuwa da kayan marmari.
Wadannan ethers cellulose kowanne yana da nasu kaddarorin na musamman da wuraren aikace-aikace. Zaɓin samfuran da suka dace yana buƙatar ƙaddara bisa ga takamaiman buƙatun aikace-aikacen da yanayin muhalli.
Lokacin aikawa: Oktoba-29-2024