Rheological Property ntawm Methyl Cellulose Solution

Methyl cellulose (MC) cov kev daws teeb meem muaj cov khoom tshwj xeeb rheological uas nyob ntawm cov yam xws li kev xav, qhov hnyav molecular, qhov kub thiab txias. Nov yog qee qhov tseem ceeb rheological zog ntawm methyl cellulose daws:

1. Viscosity: Methyl cellulose daws feem ntau pom muaj viscosity siab, tshwj xeeb tshaj yog nyob rau ntau dua thiab qis dua. Lub viscosity ntawm MC cov kev daws teeb meem tuaj yeem sib txawv ntawm ntau yam, los ntawm cov kev daws teeb meem uas tsis muaj viscosity zoo li dej mus rau cov kua nplaum uas muaj kuab heev zoo li cov khoom siv.
2. Pseudoplasticity: Methyl cellulose daws teeb tsa tus cwj pwm pseudoplastic, txhais tau hais tias lawv cov viscosity txo qis nrog nce shear npaum li cas. Thaum raug shear kev nyuaj siab, ntev polymer chains nyob rau hauv cov kev daws teeb meem raws li cov kev taw qhia ntawm ndlwg, txo tsis kam mus ntws thiab ua rau shear thinning cwj pwm.
3. Thixotropy: Cov tshuaj Methyl cellulose qhia txog tus cwj pwm thixotropic, txhais tau hais tias lawv cov viscosity txo qis nyob rau lub sijhawm nyob rau hauv qhov kev ntxhov siab tas li. Thaum txiav tawm ntawm shear, cov saw hlau polymer hauv cov tshuaj maj mam rov qab mus rau lawv qhov kev taw qhia random, ua rau viscosity rov qab thiab thixotropic hysteresis.
4. Temperature Sensitivity: Lub viscosity ntawm methyl cellulose daws yog cuam tshuam los ntawm qhov kub thiab txias, nrog rau qhov kub siab dua feem ntau ua rau qis viscosity. Txawm li cas los xij, qhov tshwj xeeb kub dependence tuaj yeem sib txawv nyob ntawm seb muaj pes tsawg leeg xws li concentration thiab molecular hnyav.
5. Shear Thinning: Methyl cellulose daws tau raug shear thinning, qhov twg cov viscosity txo qis raws li tus nqi shear nce. Cov cuab yeej no muaj txiaj ntsig tshwj xeeb hauv cov ntawv thov xws li txheej txheej thiab cov nplaum, qhov twg cov tshuaj yuav tsum tau ntws yooj yim thaum lub sij hawm thov, tab sis tswj kom muaj viscosity thaum txiav tawm ntawm shear.
6. Gel Tsim: Thaum muaj ntau dua los yog nrog qee qib ntawm methyl cellulose, cov kev daws teeb meem tuaj yeem tsim cov gels thaum txias lossis nrog cov ntsev ntxiv. Cov gels no muaj kev coj tus cwj pwm zoo, nrog rau siab viscosity thiab tsis kam ntws. Gel tsim yog siv rau hauv ntau yam kev siv, suav nrog tshuaj, khoom noj khoom haus, thiab cov khoom tu tus kheej.
7. Compatibility nrog Additives: Methyl cellulose daws yuav hloov nrog additives xws li ntsev, surfactants, thiab lwm yam polymers los hloov lawv rheological zog. Cov additives no tuaj yeem cuam tshuam rau yam xws li viscosity, gelation tus cwj pwm, thiab kev ruaj ntseg, nyob ntawm seb qhov kev xav tau tshwj xeeb.

Cov tshuaj methyl cellulose qhia txog kev coj tus cwj pwm tsis zoo ntawm cov viscosity siab, pseudoplasticity, thixotropy, kub rhiab heev, shear thinning, thiab gel tsim. Cov khoom no ua rau methyl cellulose muaj ntau yam siv rau ntau yam kev siv, suav nrog tshuaj, khoom noj khoom haus, coatings, adhesives, thiab cov khoom tu tus kheej, qhov kev tswj xyuas meej ntawm viscosity thiab ntws tus cwj pwm yog qhov tseem ceeb.