Methylcellulose (MC) yog dej-soluble cellulose derivative nrog thickening, film-forming, stabilizing thiab lwm yam khoom. Nws yog feem ntau siv hauv cov khoom noj, tshuaj, kev tsim kho, tshuaj pleev ib ce thiab lwm yam. Nws tus cwj pwm dissolution hauv dej yog qhov tshwj xeeb thiab nws yooj yim los tsim cov tshuaj colloidal, yog li txoj kev sib xyaw kom raug yog qhov tseem ceeb rau nws cov nyhuv.
1. Cov yam ntxwv ntawm methylcellulose
Methylcellulose tsis yooj yim soluble nyob rau hauv chav tsev kub, thiab nws solubility yog ho cuam tshuam los ntawm kub. Hauv dej txias, methylcellulose tuaj yeem tsim cov tshuaj sib xyaw ua ke los ntawm maj mam dispersing; tab sis nyob rau hauv dej kub, nws yuav sai sai o thiab gel. 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 chaw kuaj mob.
Dej: Nws raug nquahu kom siv cov dej distilled lossis deionized kom tsis txhob muaj impurities hauv cov dej tawv los ntawm kev cuam tshuam rau kev sib cais ntawm methylcellulose.
Cov cuab yeej sib xyaw: Nyob ntawm koj qhov kev xav tau, lub tshuab sib xyaw ua ke yooj yim, lub tshuab hluav taws xob me me, lossis cov khoom siv sib xyaw tuaj yeem siv tau. Yog tias nws yog kev ua haujlwm me me, nws raug nquahu kom siv lub tshuab magnetic stirrer.
3. Cov kauj ruam sib xyaw
Txoj Kev 1: Txoj kev ua dej txias dispersion
Cov dej txias ua ntej: Siv cov dej txias kom tsim nyog (zoo dua 0-10 ° C) thiab muab tso rau hauv lub thawv sib tov. Xyuas kom cov dej kub qis dua 25 ° C.
Maj mam ntxiv methylcellulose: Maj mam ncuav cov hmoov methylcellulose rau hauv dej txias, nplawm thaum nchuav. Txij li thaum methylcellulose nyhav rau clump, ntxiv nws ncaj qha mus rau hauv dej yuav tsim lumps, cuam tshuam txawm dispersion. Yog li ntawd, qhov sib ntxiv ceev yuav tsum tau ua tib zoo tswj kom tsis txhob ntxiv ntau cov hmoov tam sim ntawd.
Sib tov kom zoo: Siv lub tov khoom ntawm qhov nruab nrab lossis qis qis kom tawg tag nrho cov methylcellulose hauv dej. Lub sij hawm stirring nyob ntawm qhov xav tau qhov kawg viscosity thiab hom khoom siv, thiab feem ntau kav 5-30 feeb. Xyuas kom tseeb tias tsis muaj clumps los yog clumps ntawm hmoov.
o: Thaum nplawm, methylcellulose yuav maj mam nqus dej thiab o, tsim cov tshuaj colloidal. Cov txheej txheem no yuav siv sij hawm ib ntus, nyob ntawm seb hom thiab pes tsawg ntawm methylcellulose siv. Ntau dua viscosity methylcellulose siv sijhawm ntev dua.
Cia zaum kom paub tab: Tom qab nplawm tas, nws yog qhov zoo tshaj kom cia cov sib tov zaum ob peb teev los yog hmo ntuj kom paub meej tias cov methylcellulose yog yaj tag thiab o tag nrho. Qhov no tuaj yeem txhim kho homogeneity ntawm cov tshuaj ntxiv.
Txoj Kev 2: Dual txoj kev ntawm dej kub thiab txias
Txoj kev no yog tsim rau cov kua nplaum methylcellulose uas nyuaj rau disperse ncaj qha rau hauv dej txias.
Cov dej kub premix: Kub ib feem ntawm cov dej mus rau 70-80 ° C, ces maj mam do hauv cov dej kub thiab ntxiv methylcellulose. Lub sijhawm no, vim qhov kub thiab txias, methylcellulose yuav nthuav dav sai tab sis yuav tsis yaj tag.
Cov dej txias dilution: Thaum txuas ntxiv mus rau hauv cov tshuaj kub kub, maj mam ntxiv cov dej txias ntxiv kom txog rau thaum cov kua dej kub poob mus rau qhov kub thiab qis dua 25 ° C. Nyob rau hauv txoj kev no, cov o methylcellulose yuav yaj nyob rau hauv dej txias thiab tsim ib tug ruaj khov colloidal tov.
stirring thiab cia sawv ntsug: Txuas ntxiv stirring tom qab txias kom paub meej tias cov tshuaj yog uniform. Cov sib tov yog ces sab laug mus zaum kom txog thaum nws yog tag nrho yaj.
4. Ceev faj
Tswj kub: Lub solubility ntawm methylcellulose yog rhiab heev rau kub. Feem ntau disperses zoo nyob rau hauv dej txias, tab sis tej zaum yuav tsim uneven gel nyob rau hauv dej kub. Txhawm rau zam qhov xwm txheej no, nws feem ntau pom zoo kom siv cov dej txias dispersion txoj kev los yog ob txoj kev kub thiab txias.
Tsis txhob clumping: Txij li thaum methylcellulose yog absorbent heev, pouring ib tug loj npaum li cas ntawm cov hmoov ncaj qha mus rau hauv dej yuav ua rau lub nto nthuav dav thiab tsim clumps nyob rau hauv lub pob. Qhov no tsis tsuas yog cuam tshuam rau cov nyhuv dissolution, tab sis kuj tseem tuaj yeem ua rau tsis sib xws viscosity ntawm cov khoom kawg. Yog li ntawd, nco ntsoov ntxiv cov hmoov maj mam thiab do zoo.
stirring ceev: Kev kub ceev stirring tuaj yeem yooj yim qhia ntau cov npuas, tshwj xeeb tshaj yog nyob rau hauv cov kev daws teeb meem nrog ntau dua viscosity. Cov npuas yuav cuam tshuam rau kev ua haujlwm kawg. Yog li ntawd, siv qis-speed stirring yog ib qho kev xaiv zoo dua thaum koj xav tau los tswj viscosity lossis npuas ntim.
Concentration ntawm methylcellulose: Cov concentration ntawm methylcellulose hauv dej muaj kev cuam tshuam zoo rau nws qhov kev sib cais thiab kev daws teeb meem. Feem ntau hais lus, ntawm qhov tsis tshua muaj siab (tsawg dua 1%), cov tshuaj yog nyias thiab yooj yim rau do. Nyob rau hauv siab concentrations (ntau tshaj 2%), cov tshuaj yuav ua nkig heev thiab yuav tsum muaj zog zog thaum stirring.
Lub sij hawm sawv ntsug: Thaum lub sij hawm npaj cov tshuaj methylcellulose, lub sij hawm sawv tseem ceeb heev. Qhov no tsis tsuas yog tso cai rau cov methylcellulose kom yaj tag, tab sis kuj pab cov npuas hauv cov tshuaj kom ploj mus, tsis txhob muaj teeb meem npuas hauv daim ntawv thov tom ntej.
5. Cov txuj ci tshwj xeeb hauv kev thov
Hauv kev lag luam khoom noj khoom haus, methylcellulose feem ntau yog siv los ua cov thickeners, stabilizers los yog colloids, xws li ice cream, qhob cij, dej haus, thiab lwm yam. Nyob rau hauv cov ntaub ntawv no, cov kauj ruam sib tov ntawm methylcellulose nrog dej ncaj qha cuam tshuam rau lub qhov ncauj thiab kev ntxhib los mos ntawm cov khoom kawg. Kev siv nyiaj ntawm cov zaub mov qib methylcellulose feem ntau yog me me, thiab kev saib xyuas tshwj xeeb yuav tsum tau them rau qhov hnyav thiab maj mam ntxiv.
Hauv kev lag luam kws tshuaj, methylcellulose feem ntau yog siv los ua tus neeg sawv cev rau cov ntsiav tshuaj lossis ua cov khoom siv tshuaj. Hauv qhov no, kev npaj tshuaj yuav tsum muaj kev daws teeb meem ntau homogeneity thiab kev ruaj ntseg, yog li nws raug pom zoo los tswj cov khoom lag luam kawg los ntawm kev maj mam nce cov viscosity thiab optimizing lub stirring tej yam kev mob.
Kev sib xyaw methylcellulose nrog dej yog txheej txheem uas yuav tsum tau ua siab ntev thiab kev txawj ntse. Los ntawm kev tswj qhov kub ntawm cov dej, qhov kev txiav txim ntawm qhov sib ntxiv thiab kev sib tw ceev, ib qho kev daws teeb meem thiab ruaj khov methylcellulose tuaj yeem tau txais. Txawm hais tias nws yog txoj kev dej txias dispersion los yog kub thiab txias dual txoj kev, tus yuam sij yog kom tsis txhob clumping ntawm cov hmoov thiab xyuas kom txaus o thiab so.
Post lub sij hawm: Sep-30-2024