Hydroxypropyl methylcellulose (INN dzina: Hypromellulose), yomwe imafupikitsidwanso kuti hydroxypropyl methylcellulose (HPMC), ndi mitundu yosiyanasiyana ya ma non ionic cellulose mix ethers.

Hydroxypropyl methylcellulose(Dzina la INN:Hypromelulose), nawonso achidule mongahydroxypropyl methylcellulose (Mtengo wa HPMC), ndi mitundu yosiyanasiyana ya ma ether omwe si a ionic cellulose. Ndi semi synthetic, inactive, viscoelastic polima yomwe imagwiritsidwa ntchito ngati mafuta mu ophthalmology, kapena ngati chothandizira kapena chothandizira pamankhwala amkamwa, omwe amapezeka mumitundu yosiyanasiyana yazamalonda.

Monga chowonjezera cha chakudya, hydroxypropyl methylcellulose imatha kugwira ntchito zotsatirazi: emulsifier, thickener, suspension agent, ndi m'malo mwa gelatin ya nyama. Codex Alimentarius kodi ndi E464.

mankhwala katundu

Chomaliza chahydroxypropyl methyl cellulosendi ufa woyera kapena woyera lotayirira ulusi wolimba, ndi tinthu kukula kudutsa 80 mauna sieve. Mitundu yosiyanasiyana ya methoxy ndi hydroxypropyl komanso kukhuthala kwa chinthu chomalizidwa kumapangitsa kuti ikhale yamitundu yosiyanasiyana yosiyana ndi magwiridwe antchito. Lili ndi makhalidwe osungunuka m'madzi ozizira komanso osasungunuka m'madzi otentha mofanana ndi methylcellulose, ndipo kusungunuka kwake mu zosungunulira za organic kumaposa madzi. Ikhoza kusungunuka mu methanol ya anhydrous ndi ethanol, komanso ma hydrocarboni a chlorinated monga dichloromethane, trichloroethane, ndi zosungunulira za organic monga acetone, isopropanol, ndi mowa wa diacetone. Akasungunuka m'madzi, amaphatikizana ndi mamolekyu amadzi kuti apange colloid. Ndiwokhazikika ku ma acid ndi maziko ndipo samakhudzidwa mkati mwa pH ya 2-12. Ngakhale hydroxypropyl methylcellulose ndi yopanda poizoni, imatha kuyaka ndipo imatha kuchita zachiwawa ndi okosijeni [5].

The mamasukidwe akayendedwe aHPMC mankhwalakumawonjezeka ndi kuwonjezeka ndende ndi maselo kulemera. Kutentha kukakwera, kukhuthala kumayamba kuchepa. Kutentha kukafika pa kutentha kwina, kukhuthala kumatuluka mwadzidzidzi ndipo gel osakaniza amapezeka. Kutentha kwa gel osakaniza kutsika kwakanthawi kochepa ndikwapamwamba kuposa kwazinthu zowoneka bwino kwambiri. Njira yake yamadzimadzi imakhala yokhazikika kutentha kwa firiji ndipo nthawi zambiri ilibe kuwonongeka kwa viscosity kupatula kuwonongeka kwa enzymatic. Ili ndi ma gelling apadera amafuta, mawonekedwe abwino opangira filimu komanso ntchito zapamtunda.

Kukonzekera

Pambuyo pa cellulose kuthandizidwa ndi alkali, alkoxy anion yopangidwa ndi hydroxyl deprotonation ikhoza kuwonjezeredwa ku epoxy propane kuti ipange.hydroxypropyl cellulose ether; Itha kupangidwanso ndi methyl chloride kupanga methyl cellulose ether. Zochita zonsezi zikachitika nthawi imodzi,hydroxypropyl methyl celluloseamapangidwa.

cholinga

Kugwiritsa ntchitohydroxypropyl methyl cellulosendi zofanana ndi zinama cellulose ethers, makamaka ntchito dispersant, kuyimitsidwa wothandizira, thickener, emulsifier, stabilizer, ndi zomatira m'madera osiyanasiyana. Ndiwopambana kuposa ma cellulose ethers potengera kusungunuka, dispersibility, transparency, and enzyme resistance.

M'makampani azakudya ndi mankhwala, amagwiritsidwa ntchito ngati chowonjezera. Chifukwa cha zomatira zake, mawonekedwe opangira mafilimu, kukhuthala ndi kubalalitsidwa muzamadzimadzi, komanso kuthekera kwake kuteteza mafuta kulowa ndikusunga chinyezi, amagwiritsidwa ntchito ngati zomatira, zonenepa, zosokoneza, zotsitsimutsa, zokhazikika, ndi emulsifier. Alibe kawopsedwe, alibe zakudya zopatsa thanzi, komanso kusintha kwa metabolic.

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