Kusakaniza kosaya kwambiri, komwe kumagwira ntchito yofunika kwambiri pakukweza magwiridwe antchito omanga matope osakaniza ndi madzi, kumawononga ndalama zoposa 40% ya mtengo wa zinthu zomwe zimagwiritsidwa ntchito mu matope osakaniza ndi madzi. Zambiri mwa zinthu zomwe zimagwiritsidwa ntchito pamsika wamkati zimaperekedwa ndi opanga akunja, ndipo kuchuluka kwa zinthu zomwe zimagwiritsidwa ntchito kumaperekedwanso ndi ogulitsa. Mtengo wa zinthu zopangidwa ndi matope osakaniza ndi madzi ukadali wokwera motero, ndipo n'zovuta kutchukitsa matope ogwiritsidwa ntchito mwaluso komanso opaka pulasitala ndi zinthu zambiri komanso zosiyanasiyana. Zinthu zapamwamba pamsika zimayendetsedwa ndi makampani akunja, ndipo opanga matope osakaniza ndi madzi ali ndi phindu lochepa komanso mitengo yotsika; kugwiritsa ntchito zinthuzi sikuli ndi kafukufuku wokhazikika komanso wolunjika, ndipo kumatsatira njira zakunja mosazindikira. Apa, zomwe tikugawana nanu ndi izi, kodi ntchito ya hydroxypropyl methylcellulose ndi yotani mu zinthu zomwe zimagwiritsidwa ntchito mwaluso mu matope osakaniza ndi madzi?
Hydroxypropyl methylcellulose ndi mtundu wa cellulose womwe kutulutsa ndi kugwiritsa ntchito kwake kwakhala kukukwera mofulumira m'zaka zaposachedwa. Hydroxypropyl methylcellulose imapangidwa ndi thonje loyengedwa bwino pambuyo pochiza alkalizing, pogwiritsa ntchito propylene oxide ndi methyl chloride ngati etherification agents, ether yosakanikirana ya cellulose yosakhala ionic yomwe imapangidwa kudzera muzochita zingapo. Mlingo wa kusintha nthawi zambiri ndi 1.2 ~ 2.0. Katundu wake ndi wosiyana kutengera chiŵerengero cha kuchuluka kwa methoxyl ndi kuchuluka kwa hydroxypropyl. Makhalidwe a hydroxypropyl methylcellulose ndi awa:
1. Hydroxypropyl methylcellulose imasungunuka mosavuta m'madzi ozizira, ndipo imakumana ndi zovuta kusungunuka m'madzi otentha. Koma kutentha kwake kwa gelation m'madzi otentha ndi kwakukulu kwambiri kuposa kwa methyl cellulose. Kusungunuka m'madzi ozizira nakonso kumawonjezeka kwambiri poyerekeza ndi methyl cellulose.
2. Kukhuthala kwa hydroxypropyl methylcellulose kumakhudzana ndi kulemera kwake kwa mamolekyu. Kulemera kwa mamolekyulu kukakhala kwakukulu, kukhuthala kumawonjezeka. Kutentha kumakhudzanso kukhuthala kwake, pamene kutentha kumawonjezeka, kukhuthala kumachepa. Komabe, mphamvu ya kukhuthala kwake kwakukulu ndi kutentha kwake zimakhala zochepa kuposa za methyl cellulose. Yankho lake limakhala lokhazikika likasungidwa kutentha kwa chipinda.
3. Kusunga madzi kwa hydroxypropyl methylcellulose kumadalira kuchuluka kwake kowonjezera, kukhuthala, ndi zina zotero, ndipo kuchuluka kwake kosungira madzi pansi pa kuchuluka komweko kowonjezera kumakhala kwakukulu kuposa kwa methyl cellulose.
4. Hydroxypropyl methylcellulose ndi yokhazikika ku asidi ndi alkali, ndipo yankho lake lamadzi ndi lokhazikika kwambiri pa pH = 2 ~ 12. Caustic soda ndi madzi a laimu sizikhudza kwambiri magwiridwe ake, koma alkali imatha kufulumizitsa kusungunuka kwake ndikuwonjezera pang'ono kukhuthala kwake. Hydroxypropyl methylcellulose ndi yokhazikika ku mchere wamba, koma pamene kuchuluka kwa mchere kuli kwakukulu, kukhuthala kwa yankho la hydroxypropyl methylcellulose kumawonjezeka.
5. Hydroxypropyl methylcellulose ikhoza kusakanikirana ndi ma polima osungunuka m'madzi kuti apange yankho lofanana komanso lokhuthala kwambiri. Monga polyvinyl alcohol, starch ether, vegetable gum, ndi zina zotero.
6. Hydroxypropyl methylcellulose ili ndi kukana bwino kwa ma enzyme kuposa methylcellulose, ndipo kuthekera kwa kuwonongeka kwa enzymatic kwa yankho lake ndi kochepa kuposa kwa methylcellulose.
7. Kugwirizana kwa hydroxypropyl methylcellulose ku kapangidwe ka matope ndi kwakukulu kuposa kwa methylcellulose.
Nthawi yotumizira: Meyi-09-2023