Kodi mfundo ya kapangidwe ka etherification ya hydroxypropyl methylcellulose ndi iti?

Hydroxypropyl methylcellulose imagwiritsidwa ntchito ngati gawo la zinthu zopangira kupanga mafuta, omwe amatha kugwiritsa ntchito shuga wonse, kukweza kuchuluka kwa zinthu zopangira, kuchepetsa kuchuluka kwa substrate mu msuzi wa fermentation, ndikuchepetsa mtengo wa chithandizo cha madzi otayidwa. Hydroxypropyl methylcellulose iyi ndi yabwino kwambiri pakukonza njira zoperekera fermentation, fed-batch ndi continuous, kupewa mavuto angapo monga kuwongolera kapangidwe ka sing'anga ndi dilution rate; imathandizanso pakuwongolera njira yoperekera fermentation.

Hydroxypropyl methylcellulose, yomwe ndi cellulose yopangidwa ndi zinthu zopangira, imatha kukhala thonje loyengedwa kapena matabwa. Ndikofunikira kwambiri kuiphwanya musanaigwiritse ntchito kapena panthawi ya alkalization. Kuiphwanya ndi kuwononga zinthu zopangira cellulose pogwiritsa ntchito mphamvu yamakina. Kapangidwe ka ma cellulose macromolecules amatha kuchepetsa kuchuluka kwa crystallinity ndi polymerization, kuwonjezera malo ake pamwamba, motero kumawonjezera kuthekera kwa reaction reaction ndi chemical reaction kwa magulu atatu a hydroxyl omwe ali pa gulu la glucose ring la cellulose macromolecule.

Ngakhale kuti mfundo yopangira etherification ya hydroxypropyl methylcellulose si yovuta, malo osiyanasiyana a alkalizing, kuphwanya zinthu zopangira, etherification, kubwezeretsa zosungunulira, kulekanitsa kwa centrifugal, kutsuka ndi kuumitsa kumaphatikizapo ukadaulo wambiri wofunikira komanso chidziwitso chochuluka. Pa mitundu yosiyanasiyana ya zinthu, malo aliwonse ali ndi mikhalidwe yatsopano yowongolera, monga kutentha, nthawi, kuthamanga ndi kuwongolera kayendedwe ka zinthu. Zipangizo zothandizira ndi zida zowongolera ndi chitsimikizo chabwino cha khalidwe lokhazikika la zinthu komanso machitidwe odalirika opangira.

Popeza magwiridwe antchito a hydroxypropyl methylcellulose ndi ofanana ndi ma ether ena osungunuka m'madzi, angagwiritsidwe ntchito mu utoto wa latex ndi utoto wosungunuka m'madzi ngati chopangira filimu, chokhuthala, chosakaniza ndi chokhazikika.

Pangani filimu yophimba kuti ikhale yolimba, yolimba komanso yolimba, komanso yothandiza kuti pamwamba pakhale kulimba, kukhazikika kwa asidi ndi alkali, komanso kugwirizana ndi utoto wachitsulo. Hydroxypropyl methylcellulose imakhala ndi mphamvu yabwino ngati chokhuthala cha utoto woyera wa polyvinyl acetate wochokera m'madzi. Mlingo wosinthira cellulose ether umawonjezeka, ndipo kukana kukokoloka kwa bakiteriya kumawonjezekanso.