Chaw tsim cov nqi zoo rau stearic acid CAS: 57-11-4

Stearic acid, (qib kev muaj nyob) stearic acid yog ib qho ntawm ntau cov saw fatty acids uas muaj cov roj thiab cov rog. Nws tau nthuav tawm hauv cov tsiaj rog tsiaj, roj thiab qee yam roj zaub xws li zoo ntawm cov ntawv ntawm glycerides. Cov roj no, tom qab hydrolysis, tsim cov kua qaub rau acid.
Stearic acid yog cov fatty acid dav dav dav nyob rau hauv qhov xwm thiab muaj cov tshuaj muaj zog ntawm carboxylic acids. Yuav luag txhua yam rog thiab roj muaj qee qhov nyiaj ntawm cov kua qaub nrog cov ntsiab lus hauv cov tsiaj cov rog yog qhov siab txheeb ze. Piv txwv li, cov ntsiab lus hauv butter tuaj yeem ncav cuag mus txog 24% thaum cov ntsiab lus hauv cov roj hauv cov roj tshuaj yej muaj roj ua 0.8% thiab roj hauv palm yog 6%. Txawm li cas los xij, cov ntsiab lus hauv Cocoa tuaj yeem ncav cuag li 34%.

Muaj ob txoj kev loj zuj zus rau kev lag luam ntau lawm ntawm stearic acid, uas yog fraction thiab compression txujcation. Ntxiv cov neeg sawv cev rau cov roj hydrogenated, thiab tom qab ntawd hydrolyze muab cov khoom siv roj ntsha, txuas ntxiv mus kom cov khoom tiav nrog glycerol raws li byproduct.
Feem ntau cov chaw tsim khoom lag luam siv tsiaj rog rau ntau lawm. Qee hom kev ua lag luam ntau lawm yuav ua rau muaj cov roj ntsha fatty acid uas ua rau muaj ntxhiab tsw muaj ntxhiab thaum lub sijhawm ua cov yas ua thiab cov khoom kub. Txawm hais tias cov ntxhiab no tsis muaj tshuaj lom tab sis lawv yuav muaj qee yam cuam tshuam rau cov haujlwm ua haujlwm thiab ntuj ib puag ncig. Feem ntau cov ntawv luam tawm feem ntau yuav siv cov roj stearic siv cov roj ua cov khoom siv raw, cov txheej txheem kev tsim khoom yog ntau dua; Cov tsim cov kua qaub yog qhov ua tau ruaj khov, cov cuab yeej ua tau zoo lubrication thiab tsawg ntxhiab hauv daim ntawv thov.
Stearic acid feem ntau yog siv rau kev tsim cov stearates xws li Searium Stearate, Magneate Stearate, Cadmium Stearate, Hlau Stearate, thiab Potassium Stearate. Cov ntsev lossis cov ntsev potassium ntawm cov kua qaub stearic yog cov khoom siv ntawm xab npum. Txawm hais tias sodium stearate muaj peev xwm tsawg dua li sodium palmitate, tab sis nws muaj peev xwm nce hardness.
Coj butter yog cov khoom siv raw, mus dhau los ntawm cov sulfuric acid los yog cov txheej txheem sib tw rau kev rhuav tshem. Cov roj ntsha pub dawb yog thawj zaug rau kev tshem tawm cov palium acid thiab oleic acid nyob rau hauv 30 ~ 40 ℃, thiab tom qab ntawd acetate uas precipitates stearate. Tom qab ntawd ntxiv cov suluguric sulfuric acid kom tau txais cov kua qaub dawb, lim thiab coj nws, thiab siv cov acidic acid acid.