Hydroxyethyl cellulose (HEC) ne mara ionic cellulose ether amfani da ko'ina a yi, coatings, man fetur, yau da kullum sunadarai da sauran filayen. Yana da kyau thickening, dakatar, watsawa, emulsification, film-forming, m colloid da sauran kaddarorin, kuma shi ne mai muhimmanci thickener da stabilizer.
1. Shirye-shiryen albarkatun kasa
Babban albarkatun kasa na hydroxyethyl cellulose shine cellulose na halitta. Yawancin lokaci ana fitar da cellulose daga itace, auduga ko wasu tsire-tsire. Tsarin hakar cellulose yana da sauƙi mai sauƙi, amma yana buƙatar babban tsabta don tabbatar da aikin samfurin ƙarshe. Don haka, galibi ana amfani da hanyoyin sinadarai ko injina don riga-kafin maganin cellulose, gami da defatting, de-impurity, bleaching da sauran matakai don cire ƙazanta da abubuwan da ba na cellulose ba.
2. Maganin Alkalisation
Maganin Alkalization shine muhimmin mataki a cikin tsarin samar da hydroxyethyl cellulose. Manufar wannan mataki shine kunna ƙungiyar hydroxyl (-OH) akan sarkar kwayoyin halitta don sauƙaƙe halayen etherification na gaba. Maganin sodium hydroxide (NaOH) yawanci ana amfani dashi azaman wakili na alkalizing. Ƙayyadaddun tsari shine: haxa cellulose tare da maganin sodium hydroxide don cikakken kumbura da watsar da cellulose a ƙarƙashin yanayin alkaline. A wannan lokacin, ƙungiyoyin hydroxyl a kan ƙwayoyin cellulose sun zama mafi aiki, suna shirya don amsawar etherification na gaba.
3. Etherification dauki
Etherification dauki shine ainihin mataki a cikin samar da hydroxyethyl cellulose. Wannan tsari shine gabatar da ethylene oxide (wanda kuma aka sani da ethylene oxide) zuwa cellulose bayan maganin alkalinization, da amsa tare da kungiyoyin hydroxyl a cikin kwayoyin cellulose don samar da hydroxyethyl cellulose. Yawanci ana aiwatar da abin a cikin rufaffiyar reactor, yawan zafin jiki ana sarrafa shi a 50-100 ° C, kuma lokacin amsawa ya kasance daga sa'o'i da yawa zuwa sama da sa'o'i goma. Samfurin ƙarshe na amsa shine partially hydroxyethylated cellulose ether.
4. Neutralization da wanka
Bayan da etherification dauki da aka kammala, da reactants yawanci ƙunshi babban adadin unreacted alkali da by-samfurori. Domin samun samfurin hydroxyethyl cellulose mai tsabta, dole ne a gudanar da tsaka-tsaki da maganin wankewa. Yawancin lokaci, ana amfani da acid dilute (kamar dilute hydrochloric acid) don kawar da ragowar alkali a cikin dauki, sannan kuma a sake wanke reactants tare da ruwa mai yawa don cire ƙazantattun ruwa da kayan aiki. Hydroxyethyl cellulose da aka wanke yana wanzuwa a cikin nau'in biredi mai jika.
5. Rashin ruwa da bushewa
Jikakken biredin bayan wankewa yana da babban abun ciki na ruwa kuma yana buƙatar bushewa da bushewa don samun samfurin hydroxyethyl cellulose foda. Yawancin lokaci ana yin bushewa ta hanyar tacewa ko kuma rabuwa ta tsakiya don cire yawancin ruwa. Daga bisani, an aika da cake mai rigar zuwa kayan bushewa don bushewa. Kayan aikin bushewa na yau da kullun sun haɗa da bushewar ganga, na'urar bushewa da bushewar feshi. A bushewa zafin jiki ne gaba ɗaya sarrafawa a 60-120 ℃ don hana wuce kima zafin jiki daga sa samfurin denaturation ko aiki lalata.
6. Nika da Screening
Busasshiyar hydroxyethyl cellulose yawanci babban toshe ne ko kayan granular. Don sauƙaƙe amfani da haɓaka rarrabuwar samfuran, yana buƙatar ƙasa da dubawa. Yin niƙa yawanci yana amfani da injin injin niƙa don niƙa manyan tubalan abu zuwa foda mai kyau. Nunawa shine a ware ɓangarorin da ba su kai girman ɓangarorin da ake buƙata ba a cikin foda mai kyau ta fuskar fuska tare da buɗewa daban-daban don tabbatar da ingantaccen ingancin samfurin ƙarshe.
7. Kayan Samfur da Adana
Samfurin hydroxyethyl cellulose bayan niƙa da nunawa yana da wani ruwa da tarwatsawa, wanda ya dace da aikace-aikacen kai tsaye ko ƙarin aiki. Samfurin ƙarshe yana buƙatar tattarawa da adana shi don hana danshi, gurɓatawa ko oxidation yayin sufuri da ajiya. Abubuwan da ke tabbatar da danshi da anti-oxidation kamar jakunkunan foil na aluminium ko jakunkuna masu tarin yawa ana amfani da su don marufi. Bayan marufi, samfurin ya kamata a adana shi a cikin sanyi da bushe wuri, guje wa hasken rana kai tsaye da yanayin zafi mai zafi da yanayin zafi don tabbatar da aikin sa.
Tsarin samar da hydroxyethyl cellulose yafi ya hada da shirye-shiryen albarkatun kasa, maganin alkalization, amsawar etherification, neutralization da wankewa, bushewa da bushewa, niƙa da nunawa, da marufi na ƙarshe da adanawa. Kowane mataki yana da nasa buƙatun tsari na musamman da wuraren sarrafawa. Yanayin amsawa da ƙayyadaddun aiki suna buƙatar kulawa sosai yayin aikin samarwa don tabbatar da inganci da kwanciyar hankali na samfurin. Wannan multifunctional polymer abu yana da aikace-aikace masu yawa a cikin samar da masana'antu da rayuwar yau da kullum, yana nuna muhimmancin da ba za a iya maye gurbinsa ba.
Lokacin aikawa: Agusta-21-2024