Ma cellulose a Hydroxyethyl (HEC)ndi madzi osungunuka a nonionic cellulose ether, omwe amagwiritsidwa ntchito kwambiri popaka, zipangizo zomangira, mankhwala, mankhwala a tsiku ndi tsiku ndi zina. Komabe, HEC ili ndi kusungunuka kwamadzi kwambiri komanso kufooka kwa hydrophobicity, zomwe zingayambitse kuchepa kwa magwiridwe antchito pazinthu zina. Chifukwa chake, hydrophobically modified hydroxyethyl cellulose (HMHEC) idakhalapo kuti ipititse patsogolo mawonekedwe ake a rheological, kukulitsa mphamvu, kukhazikika kwa emulsification komanso kukana madzi.
1. Kufunika kwa hydrophobic kusinthidwa kwa hydroxyethyl cellulose
Kupititsa patsogolo thickening katundu ndi rheological katundu
Kusintha kwa Hydrophobic kumatha kupititsa patsogolo luso lokulitsa la HEC, makamaka pamitengo yotsika. Zimasonyeza kukhuthala kwapamwamba, zomwe zimathandiza kuwongolera thixotropy ndi pseudoplasticity ya dongosolo. Katunduyu ndi wofunikira kwambiri pankhani ya zokutira, madzi akubowola m'minda yamafuta, zinthu zosamalira anthu, ndi zina zambiri, ndipo zimatha kupititsa patsogolo kukhazikika ndikugwiritsa ntchito kwa mankhwalawa.
Kupititsa patsogolo kukhazikika kwa emulsion
Popeza HEC yosinthidwa ikhoza kupanga dongosolo logwirizana mu njira yamadzimadzi, imathandizira kwambiri kukhazikika kwa emulsion, ikhoza kuchepetsa kulekanitsa kwa madzi ndi mafuta, ndikuwongolera zotsatira za emulsification. Choncho, ili ndi phindu lalikulu la ntchito m'minda ya zokutira emulsion, mankhwala osamalira khungu ndi emulsifiers chakudya.
Limbikitsani kukana madzi ndi kupanga mafilimu
Traditional HEC ndi kwambiri hydrophilic ndipo mosavuta kusungunuka mu malo chinyezi mkulu kapena madzi, amene amakhudza madzi kukana zinthu. Kupyolera mu kusinthidwa kwa hydrophobic, ntchito yake mu zokutira, zomatira, kupanga mapepala ndi madera ena akhoza kukulitsidwa, ndipo kukana kwake kwa madzi ndi kupanga mafilimu kungawongoleredwe.
Kupititsa patsogolo kumeta ubweya wa ubweya
Hydrophobic-modified HEC ikhoza kuchepetsa kukhuthala pansi pa mikhalidwe yapamwamba yometa ubweya, pokhalabe osasunthika pamtunda wochepa wa shear, potero kupititsa patsogolo ntchito yomanga ndi kuchepetsa kugwiritsa ntchito mphamvu. Ili ndi mtengo wofunikira m'mafakitale monga migodi yamafuta ndi zokutira zomanga.
2. Hydrophobic kusinthidwa kwa hydroxyethyl cellulose
HEC hydrophobic modification nthawi zambiri imatheka poyambitsa magulu a hydrophobic kuti asinthe kusungunuka kwake ndi kukhuthala kwake pogwiritsa ntchito kulumikiza mankhwala kapena kusintha thupi. Njira zodziwika bwino zosinthira hydrophobic ndi izi:
Hydrophobic gulu Ankalumikiza
Kuyambitsa alkyl (monga hexadecyl), aryl (monga phenyl), siloxane kapena magulu a fluorinated pa molekyulu ya HEC kudzera muzochita zamankhwala kuti apititse patsogolo hydrophobicity. Mwachitsanzo:
Kugwiritsa ntchito esterification kapena etherification reaction kumezanitsa alkyl yayitali, monga hexadecyl kapena octyl, kupanga cholumikizira cha hydrophobic.
Kuyambitsa magulu a silicone kudzera pakusintha kwa siloxane kuti apititse patsogolo kukana kwake kwamadzi komanso kuthirira.
Kugwiritsa ntchito kusinthidwa kwa fluorination kuti muchepetse kukana kwanyengo ndi hydrophobicity, ndikupangitsa kuti ikhale yoyenera zokutira zapamwamba kapena ntchito zapadera zachilengedwe.
Copolymerization kapena kusintha kolumikizana
Poyambitsa ma comonomers (monga ma acrylates) kapena othandizira olumikizirana (monga epoxy resins) kuti apange maukonde olumikizirana, kukana madzi ndi kukulitsa mphamvu ya HEC kumatheka. Mwachitsanzo, ntchito hydrophobically kusinthidwa HEC mu polima emulsions akhoza kumapangitsanso bata ndi thickening zotsatira za emulsion.
Kusintha kwa thupi
Pogwiritsa ntchito ukadaulo wapamwamba kapena wokutira, mamolekyu a hydrophobic amakutidwa pamwamba pa HEC kuti apange hydrophobicity inayake. Njirayi ndi yofatsa komanso yoyenera kugwiritsa ntchito zomwe zili ndi zofunika kwambiri pakukhazikika kwamankhwala, monga chakudya ndi mankhwala.
Kusintha kwa Hydrophobic Association
Poyambitsa magulu ang'onoang'ono a hydrophobic pa molekyulu ya HEC, imapanga gulu lophatikizana mu njira yamadzimadzi, potero kumapangitsa kuti makulidwe azitha. Njirayi imagwiritsidwa ntchito kwambiri popanga zopangira zonenepa kwambiri ndipo ndizoyenera zokutira, mankhwala opangira mafuta ndi magawo ena.
Kusintha kwa Hydrophobichydroxyethyl cellulosendi njira yofunikira yopititsira patsogolo ntchito yake, yomwe imatha kukulitsa luso lake lokulitsa, kukhazikika kwa emulsification, kukana madzi ndi rheological properties. Njira zosinthira zodziwika bwino zimaphatikizapo hydrophobic group grafting, copolymerization kapena cross-linking modified, kusintha kwa thupi ndi hydrophobic association modification. Kusankha koyenera kwa njira zosinthira kumatha kukulitsa magwiridwe antchito a HEC malinga ndi zofunikira zosiyanasiyana zogwiritsira ntchito, kuti athe kutenga gawo lalikulu m'magawo ambiri monga zokutira zomangamanga, mankhwala opangira mafuta, chisamaliro chamunthu, ndi mankhwala.
Nthawi yotumiza: Mar-25-2025