1. Cellulose tau dhau los ntawm D-Glucopyranose β- ib txoj kab polymer tsim los ntawm kev sib txuas ntawm 1,4 glycoside bonds. Lub cellulose membrane nws tus kheej yog crystalline thiab tsis tuaj yeem tso rau hauv dej lossis tsim mus rau hauv daim nyias nyias, yog li nws yuav tsum yog tshuaj hloov kho. Lub pub dawb hydroxyl ntawm txoj haujlwm C-2, C-3 thiab C-6 xaus rau nws cov tshuaj lom neeg thiab tuaj yeem ua rau oxidized cov tshuaj tiv thaiv, etherification thiab makemolymerization. Lub solubility ntawm hloov cellulose tuaj yeem txhim kho thiab muaj kev ua yeeb yaj kiab zoo.
2. Xyoo 1908, Swiss Chemist Jacques Brandenberg Npaj thawj zaj duab xis cellophane, uas pionereer kev txhim kho ntawm cov khoom siv mos ntim khoom muag niaj hnub no. Txij li xyoo 1980s, cov neeg tau pib kawm cellulose raws li zaj duab xis uas muaj thiab txheej. Hloov kho daim duab puab yog ib daim nyias nyias yog cov khoom txiav tawm los ntawm cov khoom siv tshuaj ntawm cellulose. Qhov no zoo ntawm daim nyias nyias muaj zog
3. CMC yog siv hauv cov zaub mov kib, xws li french kib, kom txo qis kev nqus cov rog. Thaum nws siv ua ke nrog cov tshuaj calcium calcium, cov nyhuv yog qhov zoo dua. HPMC thiab MC tau siv dav hauv cov zaub mov ua cua sov, tshwj xeeb yog cov zaub mov kib, vim tias lawv yog cov yeeb yaj kiab thermal. Hauv Africa, MC, HPMC, pob kws protein thiab amylose tau siv los thaiv cov zaub sib xyaw rau cov khoom noj liab cov khoom noj los npaj cov yeeb yaj kiab liab. Cov khoom noj me me MC membbrane yog qhov ua tau zoo tshaj plaws nyob rau hauv cov roj teeb roj, uas tuaj yeem txo cov roj nqus ntawm 49%. Feem ntau hais lus, dipped cov qauv qhia txo qis cov roj nqus roj nqus dua li cov dej txau.
4. MCThiab HPMC tseem siv rau hauv cov qauv hmoov txhuv nplej siab xws li cov pob tw qaib, batter, qos yaj ywm chips thiab khob noom cookie txhawm rau txhim kho kev ua yeeb yam, feem ntau los ntawm kev txau. Cov kev tshawb fawb qhia tau tias MC muaj qhov kev ua tau zoo tshaj plaws ntawm kev thaiv cov dej noo thiab roj.its muaj peev xwm khiav tau yog vim nws cov hydrophilicity feem ntau yog. Los ntawm lub tshuab tsom, nws tuaj yeem pom tias MC zaj duab xis tau zoo adhesion kom kib zaub mov. Cov kev tshawb fawb tau pom tias HPMC txheej txau ntawm cov nqaij qaib cov pob muaj cov dej zoo kom txo tau cov roj av thaum lub sijhawm kib. Cov qauv dej ntawm cov qauv kawg tuaj yeem nce ntawm 16.4%, cov ntsiab lus hauv cov roj hauv cov roj muaj feem xyuam nrog cov roj thermal kev ua tau zoo ntawmHPMCCov. Ntawm thawj theem ntawm cov gel, viscosity nce nrawm, intermolecular khi tshwm sim sai sai, thiab kev daws teeb meem kev daws teeb meem ntawm 50-90 ℃. Cov txheej gel tuaj yeem tiv thaiv kev tsiv teb tsaws chaw thiab roj thaum lub sijhawm kib. Ntxiv cov hydrogel rau txheej sab nraud ntawm cov txiv hmab txiv ntoo ua haujlwm tuaj yeem txo cov roj ntsha ua haujlwm, thiab tswj hwm cov yam ntxwv tshwj xeeb ntawm cov qauv.
5. Txawm hais tias HPMC yog qhov zoo tagnrho editib zaj duab xis nrog cov cuab yeej zoo thiab cov dej vapor tiv thaiv, nws muaj cov lag luam me me. Muaj ob yam uas txwv nws daim ntawv thov: Ua ntej, nws yog lub thermal gel, uas yog, cov tshuaj uas muaj cov tshuaj tua kab kub, tab sis muaj nyob rau hauv kev daws teeb meem nrog cov viscosity heev ntawm chav tsev kub. Raws li qhov tshwm sim, daim ntawv loj yuav tsum yog preheated thiab qhuav ntawm kub thaum lub sijhawm npaj cov txheej txheem. Txwv tsis pub, nyob rau hauv cov txheej txheem ntawm txheej, txau lossis ntsw, txoj kev daws teeb meem yooj yim ntws, tsim cov khoom tsis ncaj, cuam tshuam rau kev ua yeeb yam ntawm cov yeeb yaj kiab uas muaj cov yeeb yaj kiab uas siv tau. Tsis tas li ntawd, kev ua haujlwm no yuav tsum ua kom ntseeg tau tias tag nrho cov kev cob qhia ntau lawm tau khaws cia saum toj 70 ℃, nkim nyiaj ntau. Yog li ntawd, nws yog qhov yuav tsum tau txo nws cov gel point lossis nce nws viscosity ntawm qhov kub tsawg. Thib ob, nws kim heev, kwv yees li 100000 Yuan / Nyhav.
Lub sijhawm Post: Plaub-26-2024