Dab tsi yog pH stability ntawm hydroxyethylcellulose?

Hydroxyethylcellulose (HEC) yog cov dej-soluble polymer uas tau siv dav hauv ntau daim ntawv thov xws li cov nplaum, txheej, thiab cov khoom tu tus kheej. Qhov pH ruaj khov ntawm HEC nyob ntawm ntau yam, suav nrog qib tshwj xeeb ntawm HEC, pH ntau ntawm daim ntawv thov, thiab lub sijhawm raug rau pH ib puag ncig.

HEC feem ntau ruaj khov nyob rau hauv pH ntau ntawm 2-12, uas npog ntau yam acidic rau alkaline tej yam kev mob. Txawm li cas los xij, qhov ntev ntev ntawm cov pH huab cua tuaj yeem ua rau HEC degrade, ua rau poob ntawm nws cov thickening thiab stabilizing zog.

Ntawm acidic pH qhov tseem ceeb, qis dua pH ntawm 2, HEC tuaj yeem ua rau hydrolysis, ua rau txo qis hauv molecular hnyav thiab txo cov viscosity. Ntawm alkaline pH siab heev, siab dua pH 12, HEC tuaj yeem raug alkaline hydrolysis, ua rau poob ntawm nws cov thickening thiab stabilizing zog.

Lub pH stability ntawm HEC kuj tuaj yeem cuam tshuam los ntawm kev muaj lwm yam tshuaj hauv kev tsim, xws li ntsev lossis surfactants, uas tuaj yeem cuam tshuam rau pH thiab ionic zog ntawm cov tshuaj. Qee zaum, ntxiv cov kua qaub lossis cov hauv paus yuav tsim nyog los kho cov pH thiab tswj kev ruaj ntseg ntawm HEC tov.

Zuag qhia tag nrho, HEC feem ntau ruaj khov nyob rau hauv ntau qhov pH, tab sis nws yog ib qho tseem ceeb uas yuav tau xav txog cov kev thov tshwj xeeb thiab cov qauv tsim los xyuas kom meej tias HEC tswj hwm nws cov khoom xav tau nyob rau lub sijhawm.