Kodi mukudziwa za hypromellose?

Hydroxypropyl methylcellulose (INN dzina: Hypromellose), komanso chosavuta monga hypromellose (hydroxypropyl methylcellulose, chidule mongaMtengo wa HPMC), ndi mitundu yosiyanasiyana ya ma nonionic cellulose ethers osakanikirana. Ndi semi-synthetic, inactive, viscoelastic polima yomwe imagwiritsidwa ntchito ngati mafuta mu ophthalmology, kapena ngati chothandizira kapena chothandizira pamankhwala amkamwa, ndipo imapezeka muzinthu zosiyanasiyana zamalonda.

Monga chowonjezera cha chakudya, hypromellose imatha kugwira ntchito zotsatirazi: emulsifier, thickener, suspending agent ndi m'malo mwa gelatin ya nyama. Khodi yake (E-code) mu Codex Alimentarius ndi E464.

Chemical katundu:

Chomaliza chahydroxypropyl methylcellulosendi ufa woyera kapena woyera lotayirira ulusi olimba, ndi tinthu kukula amadutsa 80 mauna sieve. Chiŵerengero cha methoxyl zomwe zili ndi hydroxypropyl zomwe zatsirizidwa ndizosiyana, ndipo kukhuthala kwake ndi kosiyana, kotero kumakhala mitundu yosiyanasiyana ndi machitidwe osiyanasiyana. Lili ndi makhalidwe osungunuka m'madzi ozizira komanso osasungunuka m'madzi otentha mofanana ndi methyl cellulose, ndipo kusungunuka kwake mu zosungunulira za organic kumaposa madzi. Ikhoza kusungunuka mu methanol ya anhydrous ndi ethanol, komanso imatha kusungunuka mu ma hydrocarboni a chlorinated monga dichloro methane, trichloroethane, ndi zosungunulira za organic monga acetone, isopropanol, ndi mowa wa diacetone. Ikasungunuka m'madzi, imaphatikizana ndi mamolekyu amadzi kuti apange colloid. Ndiwokhazikika ku asidi ndi alkali, ndipo samakhudzidwa ndi pH = 2 ~ 12. Hypromellose, ngakhale ilibe poizoni, imatha kuyaka ndipo imachita mwamphamvu ndi oxidizing agents.

The mamasukidwe akayendedwe a HPMC mankhwala kumawonjezera ndi kuwonjezeka ndende ndi maselo kulemera, ndipo pamene kutentha limatuluka, mamasukidwe akayendedwe ake akuyamba kuchepa. Ikafika kutentha kwina, kukhuthala kumatuluka mwadzidzidzi ndipo gelation imachitika. kutalika kwa. Njira yake yamadzimadzi imakhala yokhazikika kutentha kwa firiji, kupatula kuti imatha kuchepetsedwa ndi michere, ndipo kukhuthala kwake konse kulibe chodabwitsa. Lili ndi matenthedwe apadera a gelation, zinthu zabwino zopanga mafilimu ndi ntchito zapamtunda.

Kupanga:

Pambuyo pa cellulose imathandizidwa ndi alkali, alkoxy anion yopangidwa ndi deprotonation ya gulu la hydroxyl ikhoza kuwonjezera propylene oxide kupanga hydroxypropyl cellulose ether; imathanso kupangika ndi methyl chloride kupanga methyl cellulose ether. Hydroxypropyl methylcellulose imapangidwa pamene machitidwe onsewa amachitika nthawi imodzi.

Kugwiritsa:

Kugwiritsa ntchito hydroxypropyl methylcellulose ndikofanana ndi ma cellulose ethers ena. Amagwiritsidwa ntchito makamaka ngati dispersant, suspending agent, thickener, emulsifier, stabilizer ndi zomatira m'madera osiyanasiyana. Ndiwopambana kuposa ma cellulose ethers potengera kusungunuka, dispersibility, kuwonekera komanso kukana kwa enzyme.

M'makampani azakudya ndi mankhwala, amagwiritsidwa ntchito ngati chowonjezera. Amagwiritsidwa ntchito ngati zomatira, thickener, dispersant, Emollient, stabilizer ndi emulsifier. Ilibe kawopsedwe, palibe zakudya zopatsa thanzi, komanso kusintha kwa metabolic.

Kuphatikiza apo,Mtengo wa HPMCali ndi ntchito mu synthetic utomoni polymerization, petrochemicals, ceramics, papermaking, zikopa, zodzoladzola, zokutira, zomangira ndi mbale zosindikizira photosensitive.