Chochitika cha viscosity dontho panthawi yosungiramo utoto ndi vuto lofala, makamaka pambuyo pa kusungidwa kwa nthawi yaitali, kukhuthala kwa utoto kumachepa kwambiri, kumakhudza ntchito yomanga ndi khalidwe la mankhwala. Kuchepa kwa mamasukidwe akayendedwe amagwirizana ndi zinthu zambiri, monga kutentha, chinyezi, zosungunulira volatilization, polima kuwonongeka, etc., koma mogwirizana ndi thickener mapadi ether ndi kofunika kwambiri.
1. Ntchito yayikulu ya cellulose ether
Cellulose ether ndi chokhuthala chofala chomwe chimagwiritsidwa ntchito kwambiri mu utoto wamadzi. Ntchito zawo zazikulu ndi izi:
Thickening zotsatira: Ma cellulose ether akhoza kupanga kutupa atatu azithunzi-thunzi maukonde dongosolo mwa kuyamwa madzi, potero kuonjezera mamasukidwe akayendedwe a dongosolo ndi kuwongolera thixotropy ndi ntchito yomanga utoto.
Kuyimitsidwa kokhazikika: Ma cellulose ether amatha kuteteza kusungunuka kwa tinthu tating'ono tolimba monga ma pigment ndi fillers mu utoto ndikusunga utoto wofanana.
Katundu wopanga filimu: Ma cellulose ether amathanso kukhudza mawonekedwe opanga filimu a utoto, kupangitsa kuti zokutirazo zikhale zolimba komanso zolimba.
Pali mitundu yambiri ya ma cellulose ethers, kuphatikizapo methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl methyl cellulose (HPMC), ndi zina zotero. Zidazi zimakhala ndi kusungunuka kosiyana, kukulitsa mphamvu ndi kusungirako kusungirako zokutira.
2. Zifukwa zazikulu zochepetsera kukhuthala
Pakusungira zokutira, kuchepa kwa mamasukidwe akayendedwe kumachitika makamaka ndi zifukwa zotsatirazi:
(1) Kuwonongeka kwa ma cellulose ethers
Kuchuluka kwa ma cellulose ethers mu zokutira kumadalira kukula kwa maselo awo ndi kukhulupirika kwa ma cell awo. Panthawi yosungira, zinthu monga kutentha, acidity ndi alkalinity, ndi tizilombo tating'onoting'ono tingayambitse kuwonongeka kwa ma cellulose ethers. Mwachitsanzo, pakusungidwa kwa nthawi yayitali, zigawo za acidic kapena zamchere mu zokutira zimatha kutsitsa ma cellulose ether, kuchepetsa kulemera kwake kwa maselo, motero kufooketsa kukhuthala kwake, zomwe zimabweretsa kuchepa kwa mamasukidwe akayendedwe.
(2) Kusungunuka kwa zosungunulira ndi kusamuka kwa chinyezi
Kusungunuka kwa zosungunulira kapena kusuntha kwa chinyezi mu zokutira kungakhudze kusungunuka kwa cellulose ether. Pa yosungirako, mbali ya madzi mwina nthunzi kapena kusamukira pamwamba ❖ kuyanika, kupanga kugawa madzi ❖ kuyanika osagwirizana, potero zimakhudza kutupa mlingo wa mapadi efa ndi kuchititsa kuchepa mamasukidwe akayendedwe m`madera m`madera.
(3) Tizilombo toyambitsa matenda
Kukula kwa tizilombo tating'onoting'ono kumatha kuchitika mu zokutira zikasungidwa molakwika kapena zoteteza zimakhala zosagwira ntchito. Tizilombo tating'onoting'ono titha kuwola ma cellulose ethers ndi zokhuthala zina organic, kufooketsa kukhuthala kwawo ndikupangitsa kukhuthala kwa ❖ kuyanika. Zovala zokhala ndi madzi, makamaka, ndi malo abwino oti tizilombo toyambitsa matenda tizilombo toyambitsa matenda tizilombo toyambitsa matenda chifukwa timakhala ndi madzi ambiri.
(4) Kukalamba kutentha kwambiri
Pansi pazikhalidwe zosungirako kutentha kwambiri, mawonekedwe a thupi kapena mankhwala a cellulose ether molecular chain angasinthe. Mwachitsanzo, ma cellulose ethers amatha kukhala oxidation kapena pyrolysis pa kutentha kwambiri, zomwe zimapangitsa kuti kufowoke kwa kukhuthala kufooke. Kutentha kwapamwamba kumathandizanso kusungunuka kwa zosungunulira komanso kutuluka kwamadzi, zomwe zimakhudzanso kukhazikika kwamakamaka.
3. Njira zowonjezera kukhazikika kosungirako zokutira
Kuti muchepetse kuchepa kwa mamasukidwe akayendedwe panthawi yosungira ndikukulitsa moyo wosungirako zokutira, njira zotsatirazi zitha kuchitidwa:
(1) Kusankha cellulose ether yoyenera
Mitundu yosiyanasiyana ya ma cellulose ethers imakhala ndi machitidwe osiyanasiyana potengera kukhazikika kosungirako. Ma cellulose ether okhala ndi kulemera kwakukulu kwa mamolekyu nthawi zambiri amakhala ndi zotsatira zabwino zokulitsa, koma kukhazikika kwawo kosungirako kumakhala kocheperako, pomwe ma cellulose ether okhala ndi mamolekyu ochepa amatha kukhala ndi magwiridwe antchito abwinoko. Chifukwa chake, popanga fomula, ma cellulose ether okhala ndi kukhazikika bwino kosungira ayenera kusankhidwa, kapena ma cellulose ether ayenera kuphatikizidwa ndi zokhuthala zina kuti zisungidwe bwino.
(2) Kuwongolera pH ya zokutira
The acidity ndi alkalinity dongosolo ❖ kuyanika ali ndi chikoka kwambiri pa kukhazikika kwa cellulose ethers. Popanga mapangidwe, pH mtengo wa zokutira uyenera kuwongoleredwa kuti upewe malo okhala ndi acid kapena amchere kwambiri kuti achepetse kuwonongeka kwa ma cellulose ether. Nthawi yomweyo, kuwonjezera kuchuluka koyenera kwa pH chosinthira kapena buffer kungathandize kukhazikika kwa pH ya dongosolo.
(3) Kuchulukitsa kugwiritsa ntchito zoteteza
Pofuna kupewa kukokoloka kwa tizilombo tating'onoting'ono, kuchuluka koyenera kwa zotetezera ziyenera kuwonjezeredwa ku zokutira. Zotetezera zimatha kulepheretsa kukula kwa tizilombo toyambitsa matenda, potero kulepheretsa zinthu zakuthupi monga cellulose ether kuti zisawonongeke ndikusunga kukhazikika kwa zokutira. Zosungirako zoyenera ziyenera kusankhidwa molingana ndi momwe zimapangidwira ndi malo osungira, ndipo mphamvu zake ziyenera kufufuzidwa nthawi zonse.
(4) Sungani malo osungira
Kutentha kosungirako ndi chinyezi cha zokutira kumakhudza mwachindunji kukhazikika kwa viscosity. Chophimbacho chiyenera kusungidwa pamalo owuma ndi ozizira, kupewa kutentha kwakukulu ndi kutentha kwakukulu kuti muchepetse kusungunuka kwa zosungunulira ndi kuwonongeka kwa cellulose ether. Kuphatikiza apo, ma CD osindikizidwa bwino amatha kuchepetsa kusuntha ndi kutuluka kwa madzi ndikuchedwetsa kuchepa kwa mamasukidwe akayendedwe.
4. Zinthu zina zomwe zimakhudza kukhuthala
Kuphatikiza pa ma cellulose ethers, zigawo zina mu dongosolo lopaka utoto zingakhudzenso kusintha kwa mamasukidwe akayendedwe. Mwachitsanzo, mtundu ndi kuchuluka kwa pigment, kuchuluka kwa volatilization ya zosungunulira, komanso kugwirizana kwa thickeners ena kapena dispersants zingakhudze kukhazikika mamasukidwe akayendedwe a zokutira. Choncho, mapangidwe onse a ndondomeko yophimba ndi kuyanjana pakati pa zigawo zikuluzikulu ndi mfundo zofunika kuziganizira.
Kutsika kwa mamasukidwe akayendedwe pa kusungidwa kwa zokutira kumagwirizana kwambiri ndi zinthu monga kuwonongeka kwa ma cellulose ethers, kusungunuka kwa zosungunulira, komanso kusamuka kwamadzi. Pofuna kukonza kukhazikika kwa kusungidwa kwa zokutira, mitundu yoyenera ya cellulose ether iyenera kusankhidwa, pH ya zokutira iyenera kuyendetsedwa, njira zolimbana ndi dzimbiri ziyenera kulimbikitsidwa, komanso malo osungira ayenera kukonzedwa bwino. Kupyolera mukupanga ma fomula oyenerera komanso kasamalidwe kabwino kakusungirako, vuto la kuchepa kwa mamachulukidwe pakusungidwa kwa zokutira limatha kuchepetsedwa bwino, ndipo magwiridwe antchito azinthu komanso mpikisano wamsika zitha kuwongolera.
Nthawi yotumiza: Sep-27-2024