1. Mau oyamba a Hydroxyethyl Cellulose (HEC):
Hydroxyethylcellulose ndi chochokera m'madzi chosungunuka cha cellulose, polima wachilengedwe wopezeka m'makoma a cellulose.Kusintha kwa cellulose ndi magulu a hydroxyethyl kumawonjezera kusungunuka kwake m'madzi ndikupatsanso katundu wina ku HEC, kupanga HEC kukhala chinthu chamtengo wapatali mu ntchito zosiyanasiyana.
2. Kapangidwe ka HEC:
Mapangidwe a HEC amachokera ku cellulose, mzere wa polysaccharide wopangidwa ndi mayunitsi obwerezabwereza a shuga omwe amalumikizidwa ndi β-1,4-glycosidic bond.Magulu a Hydroxyethyl amalowetsedwa mu cellulose msana kudzera mu etherification reaction.Degree of substitution (DS) imatanthawuza kuchuluka kwa magulu a hydroxyethyl pamtundu uliwonse wa shuga ndipo imakhudza kusungunuka ndi kukhuthala kwa HEC.
3. Makhalidwe a HEC:
A. Kusungunuka kwa madzi: Chimodzi mwa zinthu zofunika kwambiri za HEC ndi kusungunuka kwake kwamadzi, komwe kumatchedwa hydroxyethyl substitution.Katunduyu amapangitsa kukhala kosavuta kupanga mayankho ndi dispersions oyenera ntchito zosiyanasiyana.
b.Kuchulutsa mphamvu: HEC imadziwika kwambiri chifukwa cha kukhuthala kwake munjira zamadzimadzi.Ikamwazikana m'madzi, imapanga gel owoneka bwino komanso owoneka bwino, ndikupangitsa kuti ikhale yoyenera kugwiritsa ntchito zomwe zimafunikira kuwongolera kukhuthala.
C. PH Kukhazikika: HEC imasonyeza kukhazikika pa pH yochuluka, ndikupangitsa kuti ikhale yogwirizana ndi mapangidwe m'madera onse a acidic ndi alkaline.
d.Kukhazikika kwa kutentha: Mayankho a HEC amakhalabe okhazikika pa kutentha kwakukulu.Amatha kutenthetsa ndi kuzizira kangapo popanda kusintha kwakukulu kwa viscosity kapena zinthu zina.
e.Mapangidwe amafilimu: HEC imatha kupanga makanema osinthika komanso owoneka bwino oyenera kugwiritsa ntchito monga zokutira, zomatira ndi makanema.
F. Ntchito Pamwamba: HEC ili ndi zinthu zonga surfactant, zomwe zimakhala zopindulitsa pamapulogalamu omwe amafunikira kusinthidwa kapena kukhazikika.
4.Kuphatikizika kwa HEC:
Kaphatikizidwe ka HEC kumaphatikizapo etherification reaction ya cellulose ndi ethylene oxide pamaso pa chothandizira zamchere.Zomwe zitha kuwongoleredwa kuti zikwaniritse kuchuluka komwe kumafunikira m'malo, potero kukhudza zomaliza za mankhwala a HEC.Kaphatikizidwe nthawi zambiri imachitika pansi pazikhalidwe zoyendetsedwa kuti zitsimikizire kusasinthika kwazinthu komanso khalidwe.
5. Kugwiritsa ntchito HEC:
A. Paints and Coatings: HEC imagwiritsidwa ntchito kwambiri ngati chowonjezera mu utoto wamadzi ndi zokutira.Imawonjezera rheology, imathandizira kusungunuka, ndipo imathandizira kukhazikika kwa mapangidwe.
b.Zinthu zodzisamalira: HEC ndi chinthu chodziwika bwino pazamankhwala osamalira anthu monga ma shampoos, mafuta odzola ndi mafuta opaka.Imakhala ngati thickener, stabilizer ndi filimu kupanga wothandizira, kupititsa patsogolo ntchito yonse ya mapangidwe awa.
C. Pharmaceutical: M'makampani opanga mankhwala, HEC imagwiritsidwa ntchito popanga pakamwa ndi pamutu.Itha kugwira ntchito ngati chomangira, chophatikizira, kapena chophatikizira kale pamapangidwe amapiritsi, komanso ngati chosinthira mamasukidwe amtundu wa gels ndi zopakapaka.
d.Zipangizo zomangira: HEC imagwiritsidwa ntchito pantchito yomanga ngati chosungira madzi muzopanga zopangira simenti.Imapititsa patsogolo ntchito yomanga, imakulitsa nthawi yotseguka, ndikuwonjezera kumamatira kwa zomatira ndi matope.
e.Makampani a Mafuta ndi Gasi: HEC imagwiritsidwa ntchito m'makampani amafuta ndi gasi ngati chowonjezera pakubowola madzi.Imathandiza kulamulira mamasukidwe akayendedwe ndi amapereka suspending katundu kuteteza particles kukhazikika.
F. Chakudya Chakudya: HEC imagwiritsidwa ntchito muzakudya monga thickener, stabilizer ndi gelling agent muzinthu zosiyanasiyana, kuphatikizapo sauces, madiresi ndi zokometsera.
6. Zolinga zamalamulo:
HEC nthawi zambiri imadziwika kuti ndi yotetezeka (GRAS) ndi mabungwe olamulira ndipo kugwiritsidwa ntchito kwake pazinthu zosiyanasiyana kumayendetsedwa kuti zitsimikizire chitetezo cha ogula komanso kuthandizira kwazinthu.Opanga amayenera kutsatira malamulo amderali ndikupeza zivomerezo zofunikira pazofunsira zinazake.
7. Zamtsogolo ndi zatsopano:
Kafukufuku wopitilira akuyang'ana pakupanga zosinthidwa za HEC zokhala ndi zida zowonjezera pazogwiritsa ntchito zina.Palinso kuyang'ana kwambiri pazatsopano mu njira zokhazikika zopezera ndi kupanga zothana ndi zovuta zachilengedwe komanso kulimbikitsa njira zina zosawononga chilengedwe.
Hydroxyethylcellulose (HEC) ndi polima yosunthika, yosunthika yokhala ndi zinthu zapadera monga kusungunuka kwamadzi, kuthekera kokulirakulira, komanso kukhazikika kwa kutentha.Kuyambira utoto ndi zokutira kupita kumakampani opanga mankhwala ndi zakudya, HEC imagwira ntchito yofunika kwambiri pakuwongolera magwiridwe antchito azinthu zosiyanasiyana.Pamene kafukufuku ndi chitukuko chikupitirirabe, HEC ikuyenera kukhalabe gawo lalikulu m'mafakitale osiyanasiyana, zomwe zikuthandizira kupititsa patsogolo zipangizo ndi mapangidwe.
Nthawi yotumiza: Dec-29-2023