Kodi hydroxypropyl methyl cellulose ndi hydroxyethyl cellulose zimakhala ndi makhalidwe otani?

1. Hydroxypropyl methyl cellulose

Hydroxypropyl methylcelluloseNdi mtundu wa cellulose womwe kutulutsa ndi kugwiritsa ntchito kwake kukuwonjezeka mofulumira. Ndi ether yosakanikirana ya cellulose yosakhala ionic yopangidwa kuchokera ku thonje loyengedwa pambuyo pa alkalization, pogwiritsa ntchito propylene oxide ndi methyl chloride ngati etherification, kudzera muzochita zingapo. Mlingo wa kusintha nthawi zambiri umakhala 1.2 ~ 2.0. Katundu wake amasiyana malinga ndi chiŵerengero cha methoxyl ndi hydroxypropyl.

(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) (2) Kukhuthala kwa hydroxypropyl methylcellulose kumagwirizana ndi kulemera kwake kwa mamolekyulu, ndipo 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 ndi lokhazikika likasungidwa kutentha kwa chipinda.

(3) Kusunga madzi kwa hydroxypropyl methylcellulose kumadalira kuchuluka kwake kowonjezera, kukhuthala kwake, 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 lolimba kwambiri. Monga polyvinyl alcohol, starch ether, vegetable gum, ndi zina zotero.

(6) Hydroxypropyl methylcellulose ili ndi kukana bwino kwa ma enzyme kuposa methylcellulose, ndipo yankho lake silingathe kuwonongeka ndi ma enzyme kuposa methylcellulose.

(7) Kugwirizana kwa hydroxypropyl methylcellulose ku matope opangidwa ndi matope n'kokwera kuposa kwa methylcellulose.

2. Hydroxyethyl cellulose

Imapangidwa kuchokera ku thonje loyengedwa bwino lokonzedwa ndi alkali, ndipo imayatsidwa ndi ethylene oxide ngati etherification ngati ilipo ndi isopropanol. Mlingo wake wosinthira nthawi zambiri ndi 1.5 ~ 2.0. Ili ndi hydrophilicity yamphamvu ndipo imayamwa mosavuta chinyezi.

(1) Hydroxyethyl cellulose imasungunuka m'madzi ozizira, koma imakhala yovuta kusungunuka m'madzi otentha. Yankho lake ndi lokhazikika kutentha kwambiri popanda gelling. Itha kugwiritsidwa ntchito kwa nthawi yayitali kutentha kwambiri mu mortar, koma kusunga kwake madzi ndi kochepa kuposa kwa methyl cellulose.

(2)Hydroxyethyl celluloseNdi yokhazikika ku asidi wamba ndi alkali, ndipo alkali imatha kufulumizitsa kusungunuka kwake ndikuwonjezera pang'ono kukhuthala kwake. Kufalikira kwake m'madzi ndi koipa pang'ono kuposa kwa methyl cellulose ndi hydroxypropyl methyl cellulose.

(3) Hydroxyethyl cellulose ili ndi mphamvu yabwino yoletsa kutsika kwa matope, koma simenti imachedwa kutsika nthawi yayitali.

(4) Kagwiridwe ka ntchito ka hydroxyethyl cellulose komwe kamapangidwa ndi mabizinesi ena am'nyumba n'kotsika poyerekeza ndi ka methyl cellulose chifukwa cha kuchuluka kwa madzi ndi phulusa.

(5) Nkhungu ya madzi a hydroxyethyl cellulose ndi yoopsa kwambiri. Pa kutentha kwa pafupifupi 40°C, nkhungu ingachitike mkati mwa masiku atatu mpaka asanu, zomwe zingakhudze magwiridwe ake ntchito.