Methylcellulose (MC) yog ib qho cellulose derivative uas yaj tau hauv dej nrog cov khoom ua kom tuab, ua zaj duab xis, ruaj khov thiab lwm yam. Nws feem ntau siv rau hauv cov khoom noj, tshuaj, kev tsim kho, tshuaj pleev ib ce thiab lwm yam. Nws tus cwj pwm yaj hauv dej yog qhov tshwj xeeb thiab nws yooj yim los tsim cov kua colloidal, yog li txoj kev sib tov kom raug yog qhov tseem ceeb rau nws cov nyhuv.
1. Cov yam ntxwv ntawm methylcellulose
Methylcellulose tsis yooj yim yaj thaum sov li chav tsev, thiab nws qhov solubility raug cuam tshuam los ntawm qhov kub thiab txias. Hauv dej txias, methylcellulose tuaj yeem tsim cov tshuaj sib xyaw los ntawm kev maj mam tawg; tab sis hauv dej kub, nws yuav o thiab gel sai sai. Yog li ntawd, kev tswj qhov kub thiab txias yog qhov tseem ceeb heev thaum sib tov methylcellulose nrog dej.
2. Kev Npaj
Methylcellulose: Muaj los ntawm cov chaw muag khoom siv tshuaj lom neeg lossis cov chaw kuaj mob.
Dej: Nws raug pom zoo kom siv dej distilled lossis deionized kom tsis txhob muaj cov khoom tsis huv hauv dej tawv los cuam tshuam rau kev yaj ntawm methylcellulose.
Cov Khoom Siv Sib Tov: Nyob ntawm seb koj xav tau dab tsi, koj siv tau lub tshuab sib tov tes yooj yim, lub tshuab sib tov me me uas khiav ceev heev, lossis cov khoom siv sib tov hauv kev lag luam. Yog tias nws yog kev ua haujlwm hauv chav kuaj me me, nws raug pom zoo kom siv lub tshuab sib tov sib nqus.
3. Kauj ruam sib tov
Txoj Kev 1: Txoj kev faib dej txias
Sib tov ua ntej nrog dej txias: Muab dej txias kom txaus (qhov zoo tshaj yog 0-10°C) thiab muab tso rau hauv lub thawv sib tov. Xyuas kom qhov kub ntawm dej qis dua 25°C.
Maj mam ntxiv methylcellulose: Maj mam nchuav cov hmoov methylcellulose rau hauv dej txias, do thaum nchuav. Vim tias methylcellulose feem ntau sib sau ua ke, kev ntxiv ncaj qha rau hauv dej yuav ua rau muaj pob, cuam tshuam rau kev sib kis. Yog li ntawd, qhov ceev ntxiv yuav tsum tau tswj kom zoo kom tsis txhob ntxiv ntau cov hmoov tam sim ntawd.
Sib tov kom zoo: Siv lub tshuab sib tov ntawm qhov ceev nruab nrab lossis qis kom cov methylcellulose tawg tag nrho hauv dej. Lub sijhawm sib tov nyob ntawm qhov viscosity ntawm cov tshuaj kawg thiab hom khoom siv, thiab feem ntau kav ntev li 5-30 feeb. Xyuas kom tseeb tias tsis muaj cov pawg lossis cov hmoov av.
Kev O: Thaum do, methylcellulose yuav maj mam nqus dej thiab o, tsim cov kua colloidal. Cov txheej txheem no yuav siv sijhawm ntev, nyob ntawm hom thiab ntau npaum li cas ntawm methylcellulose siv. Cov methylcellulose viscosity siab dua yuav siv sijhawm ntev dua.
Cia kom nws siav: Tom qab do tas lawm, cia nws nyob ob peb teev lossis ib hmos kom cov methylcellulose yaj tag thiab o tag. Qhov no yuav ua rau cov tshuaj sib xyaw zoo dua.
Txoj Kev 2: Ob txoj kev siv dej kub thiab dej txias
Txoj kev no yog qhov tsim nyog rau cov methylcellulose uas muaj viscous heev uas nyuaj rau disperse ncaj qha rau hauv dej txias.
Cov dej kub ua ntej sib tov: Ua kom ib feem ntawm cov dej kub txog 70-80°C, tom qab ntawd maj mam do cov dej kub rau hauv thiab ntxiv methylcellulose. Lub sijhawm no, vim yog qhov kub siab, methylcellulose yuav nthuav dav sai tab sis yuav tsis yaj tag.
Kev sib xyaw dej txias: Thaum txuas ntxiv do cov kua kub siab, maj mam ntxiv cov dej txias seem kom txog thaum qhov kub ntawm cov kua poob rau qhov kub ib txwm lossis qis dua 25 ° C. Ua li no, cov methylcellulose uas o yuav yaj hauv dej txias thiab tsim cov kua colloidal ruaj khov.
Kev Sib Dhos thiab Cia Sawv: Txuas ntxiv sib do tom qab txias kom paub tseeb tias cov tshuaj sib xyaw zoo ib yam. Tom qab ntawd cia cov khoom sib tov nyob kom txog thaum nws yaj tag.
4. Kev ceev faj
Kev tswj qhov kub: Qhov solubility ntawm methylcellulose yog rhiab heev rau qhov kub. Feem ntau disperses zoo nyob rau hauv dej txias, tab sis tej zaum yuav tsim tsis sib npaug gel nyob rau hauv dej kub. Yuav kom tsis txhob muaj qhov xwm txheej no, nws feem ntau pom zoo kom siv cov txheej txheem dispersion dej txias lossis cov txheej txheem kub thiab txias ob.
Tsis txhob muab cov khoom sib sau ua ke: Vim tias methylcellulose nqus tau dej zoo heev, yog tias muab cov hmoov ntau ntau rau hauv dej ces yuav ua rau qhov chaw nthuav dav sai thiab ua cov khoom sib sau ua ke hauv pob. Qhov no tsis yog tsuas yog cuam tshuam rau qhov kev yaj xwb, tab sis kuj tseem yuav ua rau cov khoom kawg tsis sib xws. Yog li ntawd, nco ntsoov ntxiv cov hmoov maj mam thiab do kom zoo.
Kev sib xyaw ceev: Kev sib xyaw ceev ceev tuaj yeem ua rau muaj ntau lub npuas, tshwj xeeb tshaj yog nyob rau hauv cov tshuaj uas muaj viscosity siab dua. Cov npuas yuav cuam tshuam rau qhov kev ua tau zoo kawg. Yog li ntawd, kev siv kev sib xyaw ceev qis yog qhov kev xaiv zoo dua thaum koj xav tau tswj viscosity lossis ntim npuas.
Kev sib xyaw ua ke ntawm methylcellulose: Qhov sib xyaw ua ke ntawm methylcellulose hauv dej muaj feem cuam tshuam loj heev rau nws cov khoom yaj thiab cov khoom siv. Feem ntau hais lus, ntawm qhov sib xyaw ua ke tsawg (tsawg dua 1%), cov tshuaj yog nyias thiab yooj yim rau do. Ntawm qhov sib xyaw ua ke siab (ntau dua 2%), cov tshuaj yuav dhau los ua viscous heev thiab xav tau lub zog muaj zog dua thaum do.
Lub sijhawm sawv: Thaum lub sijhawm npaj cov tshuaj methylcellulose, lub sijhawm sawv yog qhov tseem ceeb. Qhov no tsis yog tsuas yog tso cai rau cov methylcellulose kom yaj tag, tab sis kuj tseem pab cov npuas hauv cov tshuaj kom ploj mus ntuj, zam kev teeb meem npuas hauv kev siv tom qab.
5. Cov txuj ci tshwj xeeb hauv kev thov
Hauv kev lag luam khoom noj, methylcellulose feem ntau yog siv los ua cov khoom ua kom tuab, cov khoom ruaj khov lossis cov khoom sib xyaw, xws li ice cream, qhob cij, dej haus, thiab lwm yam. Hauv cov ntawv thov no, cov kauj ruam sib xyaw ntawm methylcellulose nrog dej cuam tshuam ncaj qha rau qhov ncauj thiab cov qauv ntawm cov khoom kawg. Kev siv cov khoom noj methylcellulose feem ntau yog me me, thiab yuav tsum tau them sai sai rau qhov hnyav raug thiab maj mam ntxiv.
Hauv kev lag luam tshuaj, methylcellulose feem ntau siv ua tus neeg sawv cev rau cov ntsiav tshuaj lossis ua tus nqa tshuaj. Hauv qhov no, kev npaj tshuaj xav tau qhov sib xws thiab kev ruaj khov ntawm cov tshuaj, yog li nws raug pom zoo kom tswj qhov zoo ntawm cov khoom kawg los ntawm kev maj mam nce qhov viscosity thiab ua kom zoo dua cov xwm txheej sib xyaw.
Kev sib tov methylcellulose nrog dej yog ib qho txheej txheem uas xav tau kev ua siab ntev thiab kev txawj ntse. Los ntawm kev tswj qhov kub ntawm dej, qhov kev txiav txim ntawm kev ntxiv thiab qhov ceev ntawm kev sib tov, cov tshuaj methylcellulose sib xws thiab ruaj khov tuaj yeem tau txais. Txawm hais tias nws yog txoj kev sib kis dej txias lossis txoj kev kub thiab txias ob txoj kev, qhov tseem ceeb yog kom tsis txhob muaj cov hmoov sib sau ua ke thiab xyuas kom meej tias txaus o thiab so.
Lub sijhawm tshaj tawm: Cuaj hlis-30-2024