Methylhydroxyethylcellulose (MHEC) ndi gawo lofunikira m'mafakitale osiyanasiyana, makamaka pomanga, zamankhwala, ndi zinthu zosamalira anthu.Ntchito yake yayikulu ngati yosunga madzi imapangitsa kuti ikhale yofunikira kwambiri pazinthu monga simenti, zopangira mankhwala, ndi zodzoladzola.
1. Mapangidwe a Molecular a MHEC:
MHEC ndi ya banja la cellulose ethers, zomwe zimachokera ku cellulose-polima yopezeka mwachilengedwe yomwe imapezeka m'makoma a cellulose.MHEC imapangidwa kudzera mu etherification ya cellulose, momwe magulu onse a methyl ndi hydroxyethyl amalowetsedwa pamsana wa cellulose.Mlingo wolowa m'malo (DS) wamaguluwa umasiyanasiyana, zomwe zimakhudza katundu wa MHEC monga kusungunuka, kukhuthala, ndi mphamvu zosungira madzi.
2. Kusungunuka ndi Kubalalitsidwa:
MHEC imawonetsa kusungunuka kwabwino m'madzi chifukwa cha kukhalapo kwa magulu a hydrophilic hydroxyethyl.Akamwazika m'madzi, mamolekyu a MHEC amapita ku hydration, ndi mamolekyu amadzi omwe amapanga ma hydrogen bond ndi magulu a hydroxyl omwe amapezeka pamsana wa cellulose.Njira iyi ya hydration imayambitsa kutupa kwa tinthu ta MHEC ndikupanga njira yothetsera viscous kapena kubalalitsidwa.
3. Njira Yosungira Madzi:
Njira yosungira madzi ya MHEC ndi yochuluka ndipo imaphatikizapo zinthu zingapo:
a.Kugwirizana kwa Hydrogen: Mamolekyu a MHEC ali ndi magulu angapo a hydroxyl omwe amatha kupanga ma hydrogen bond ndi mamolekyu amadzi.Kuyanjana uku kumawonjezera kusungidwa kwa madzi potsekera madzi mkati mwa matrix a polima kudzera mu hydrogen bonding.
b.Mphamvu Yotupa: Kukhalapo kwa magulu onse a hydrophilic ndi hydrophobic ku MHEC kumapangitsa kuti ifufuze kwambiri ikakhala ndi madzi.Pamene mamolekyu amadzi amalowa mumtundu wa polima, maunyolo a MHEC amatupa, kupanga mawonekedwe ngati gel omwe amasunga madzi mkati mwa matrix ake.
c.Capillary Action: Popanga ntchito zomanga, MHEC nthawi zambiri imawonjezedwa kuzinthu za simenti monga matope kapena konkire kuti zitheke kugwira ntchito komanso kuchepetsa kutayika kwa madzi.MHEC imagwira ntchito mkati mwa ma capillary pores a zinthu izi, kuteteza kutuluka kwamadzi mwachangu ndikusunga chinyezi chofanana.Kuchita kwa capillary kumeneku kumathandizira bwino ma hydration ndi machiritso, zomwe zimapangitsa kuti pakhale mphamvu komanso kulimba kwa chinthu chomaliza.
d.Katundu Wopanga Mafilimu: Kuphatikiza pa kuthekera kwake kosunga madzi m'mayankho ambiri, MHEC imatha kupanganso makanema owonda akagwiritsidwa ntchito pamwamba.Mafilimuwa amakhala ngati zotchinga, kuchepetsa kutayika kwa madzi kudzera mu nthunzi komanso kupereka chitetezo ku kusintha kwa chinyezi.
4. Chikoka cha Degree of Substitution (DS):
Mlingo wolowa m'malo mwa magulu a methyl ndi hydroxyethyl pamsana wa cellulose umakhudza kwambiri kusungidwa kwa madzi kwa MHEC.Makhalidwe apamwamba a DS nthawi zambiri amapangitsa kuti madzi asamasungidwe bwino chifukwa cha kuchuluka kwa hydrophilicity komanso kusinthasintha kwa tcheni.Komabe, kuchulukirachulukira kwa DS kungayambitse kukhuthala kochulukirapo kapena kutsekemera, zomwe zimakhudza kusinthika ndi magwiridwe antchito a MHEC pamapulogalamu osiyanasiyana.
5. Kuyanjana ndi Zigawo Zina:
M'mapangidwe ovuta monga mankhwala kapena mankhwala osamalira anthu, MHEC imagwirizana ndi zinthu zina, kuphatikizapo mankhwala omwe amagwira ntchito, opangira ma surfactants, ndi thickeners.Kuyanjana kumeneku kungakhudze kukhazikika, kukhuthala, ndi mphamvu ya mapangidwe.Mwachitsanzo, pakuyimitsidwa kwamankhwala, MHEC ikhoza kuthandizira kuyimitsa zinthu zogwira ntchito mofanana mu gawo lamadzimadzi, kuteteza kusungunuka kapena kuphatikizika.
6. Zoganizira Zachilengedwe:
Ngakhale kuti MHEC ndi yokhoza kuwonongeka ndipo nthawi zambiri imatengedwa kuti ndi yogwirizana ndi chilengedwe, kupanga kwake kungaphatikizepo mankhwala omwe amatulutsa zinyalala kapena zinthu zina.Opanga akuwunika kwambiri njira zopangira zokhazikika komanso kupeza ma cellulose kuchokera kumagwero osinthika a biomass kuti achepetse kuwonongeka kwa chilengedwe.
7. Mapeto:
Methylhydroxyethylcellulose (MHEC) ndi njira yosungira madzi yosunthika yomwe imagwiritsidwa ntchito mosiyanasiyana m'mafakitale osiyanasiyana.Kapangidwe kake ka mamolekyu, kusungunuka kwake, ndi kugwirizana kwake ndi madzi kumathandizira kuti asunge chinyezi, kuwongolera magwiridwe antchito, komanso kupititsa patsogolo magwiridwe antchito azinthu.Kumvetsetsa momwe ntchito ya MHEC imagwirira ntchito ndikofunikira pakukhathamiritsa ntchito yake m'machitidwe osiyanasiyana ndikuganizira zinthu monga kuchuluka kwa m'malo, kugwirizana ndi zosakaniza zina, komanso malingaliro a chilengedwe.
Nthawi yotumiza: Mar-19-2024