Hydroxyethyl cellulose (hec) ndi polymer yopanda madzi, yosungunuka yochokera ku cellulose, polymer achilengedwe omwe amapezeka m'makoma a cell a mbewu. Amagwiritsidwa ntchito kwambiri m'mafakitale osiyanasiyana, kuphatikizapo mankhwala odzola, zodzoladzola, utoto, ndi zomatira, chifukwa cha kukula kwake kwakukulu, kupanga mawonekedwe ake. Kukonzekera kwa hydroxethyl cellulose kumaphatikizapo kusinthika kwa cellulose ndi ethylene oxide pansi pa milkaline. Njira iyi imatha kung'ambika m'mayendedwe angapo: cellulose yoyeretsa, kupembedza, kusinthika, kusambitsa, kuchapa, kutsuka, ndi kuyanika.
1. Chiyeretso cha cellulose
Gawo loyamba pokonza hydrothyl cellulose ndi kuyerira kwa cellulose, komwe kumachitika chifukwa cha mitengo yamitengo kapena ma thonje. Cellulose yaiwisi imakhala ndi zodetsa monga Lignallose, ndi zina zowonjezera zomwe ziyenera kuchotsedwa kuti zipezeke bwino kwambiri cellulose yoyenerera yamankhwala.
Njira Zomwe Zimakhudzidwa:
Kukonza: Cellulose yaiwisi imakonzedwa mwamphamvu kuti achepetse kukula kwake ndikuwonjezera malo ake, kuthandizira mankhwala oyambitsa mankhwala.
Mankhwala a mankhwala: Cellulose imathandizidwa ndi mankhwala monga sodium hydroxide (Naoh) ndi helmillilose (Na2SO
2. Alkalization
Cellulose yoyeretsedwa imakhala yokhazikika kuti iyambitse chizolowezi. Izi zimaphatikizapo kugwiritsa ntchito cellulose ndi madzi osokoneza bongo a sodium hydroxide.
Chitani:
Cellulose + Naoh → Alkalili cellulose
Ndondomeko:
Cellulose imayimitsidwa m'madzi, ndi sodium hydroxide yankho limawonjezeredwa. Kukhazikika kwa Naoh nthawi zambiri kumachokera ku 10-30%, ndipo zomwe zimachitika zimachitika pamatenthedwe pakati pa 20-0 ° C.
Osakaniza amalimbikitsidwa kuonetsetsa kuyamwa kwa alkali, komwe kumadzetsa mapangidwe a alkali celloli. Pakatikati pake pali zopindulitsa kwa Ethylene oxide, kuwongolera njira yobwezera.
3.
Gawo lofunikira pokonzekera hydroththyl cellulose ndiye kusintha kwa alkali cellulose ndi ethylene oxide. Izi zimayambitsa magulu a hydroxyethyl (-ch2ch2oh) m'mphepete mwa m'mphepete mwa nyanjayo, ndikupangitsa kuti isungunuke.
Chitani:
Alkali cellouluse + ethylene oxide → hydroxyethyl cellulose + Naoh
Ndondomeko:
Ethylene oxide amawonjezeredwa ku Alkalin cellose, mwina mu batch kapena njira yopitilira. Zomwe zimachitika zimachitika mu Autoclave kapena kuponderezedwa.
Zochitikazo, kuphatikizapo kutentha (50-100 ° C) ndi kukakamizidwa (1-5 ATM), amayang'aniridwa mosamala kuti awonetsetse zomwe zili m'magulu a hydroxyethyll. Mulingo wa zolowa m'malo (DS) ndi molar zolowetsera (ms) ndi magawo ovuta omwe amalimbikitsa katundu womaliza.
4. Kulowerera
Pambuyo pa chizindikiritso, osakaniza amakhala hydroxethyl cellulose ndi kotsalira sodium hydroxide. Gawo lotsatira ndikulowererapo, pomwe alkali ochulukirapo amalowerera ndale, makamaka acetic acid (ch3cooh) kapena hydrochloric acid (HCL).
Mwachita: Naoh + hcl → Naacl + h2o
Ndondomeko:
Acid imawonjezeredwa pang'onopang'ono pazosakaniza zomwe zimayendetsedwa moyenera kuti mupewe kutentha kwambiri komanso kupewa kuwonongeka kwa hydroxethyl cellulose.
Kusakaniza kosakanikirana kumachitika kenako kusinthidwa ndikuwonetsetsa kuti ndizomwe mungafune, zomwe zimakonda kwambiri PH (6-8).
5. Kusamba
Kutsatira kusalowerera, chinthucho chikuyenera kutsukidwa kuti lichotse mchere ndi zina zopangidwa ndi zinthu. Izi ndizofunikira kuti mupeze hydroxethyl cellulose.
Ndondomeko:
Zosakaniza zomwe sizingachitike zimachepetsedwa ndi madzi, ndipo ma hydroxyethyl cellose amalekanitsidwa ndi kusefedwa kapena centrifugation.
Chuma cholekanitsidwa ndi ma hydroxyethyl chimatsukidwa mobwerezabwereza ndi madzi owonetsetsa kuti achotse mchere ndi zosayera. Njira yotsutsira ikupitilira mpaka madzi atasambitsa, kuwonetsa kuchotsedwa kwa zokhumudwitsa.
6. Kuyanika
Gawo lomaliza pokonzekera hydroththyl cellose ikuwuma. Gawo ili limachotsa madzi owonjezera, kulephera, zowuma, zopangidwa bwino pazogwiritsa ntchito zosiyanasiyana.
Ndondomeko:
Celroxyathyl cellose imafalikira pa zouma kapena zoperekedwa kudzera mu msewu wowuma. Kutentha kumayendetsedwa mosamala kuti tipewe kuwonongeka kwa mafuta, kumayambira kuchokera pa 50-80 ° C.
Kapenanso, kuwuma kopukutira kumatha kugwiritsidwa ntchito powuma mwachangu komanso moyenera. Pakuwuma, kuyika ma hydroxethyl cellulose njira kumavomerezeka kumadonthoki abwino ndikuwuma mumtsinje wa mpweya, womwe umapangitsa kuti pakhale ufa wabwino.
Chomera chouma chimakhala ndi tinthu tating'onoting'ono komanso chodzaza ndi kugawa ndi kugawa.
Kuwongolera kwapadera ndi ntchito
Nthawi yonse yokonzekera, njira zowongolera zolimba zimapangidwa kuti zitsimikizidwe kuti sizisinthasintha komanso mtundu wa hydroxethyl cellulose. Magawo ofunikira monga mawonekedwe, kuchuluka kwa kulowetsa, chinyezi, ndi kukula kwa tinthu kumayang'aniridwa.
Mapulogalamu:
Mankhwala ogulitsa: ogwiritsidwa ntchito ngati wothandizira kukula, binder, ndi kukhazikika kwa mapiritsi, kuyimitsidwa, ndi mafuta.
Zodzikongoletsera: Zimapereka mafayilo ndi kapangidwe ka zopangidwa ngati zonona, zodzola, ndi shampoos.
Utoto ndi zokutira: amachita ngati thickier ndi rheology osintha, kukonza zomwe zimagwiritsidwa ntchito ndi kukhazikika kwa utoto.
Makampani Opanga Zakudya: Ntchito ngati thicker, rukanitse, ndi emulsiferier m'malonda osiyanasiyana.
Kukonzekera kwa hydrothyl cellulose kumaphatikizapo njira zingapo zotanthauzira bwino ndi makina ofunikira pakusintha kwa cellulose kukhazikitsa magulu a hydroxyethyl. Gawo lirilonse, chifukwa choyeretsera kwa cellulose kuti kuyanika, ndikofunikira posankha mtundu ndi magwiridwe antchito omaliza. Ma hydroxyethyl cellulose imapangitsa kuti ikhale yofunika kwambiri m'malo ambiri, kuwunikira kufunikira kwa zochitika molondola kukwaniritsa zofunikira zosiyanasiyana kukwaniritsa zofunikira zosiyanasiyana.
Post Nthawi: Meyi-28-2024