Qhov txawv ntawm HPMC thiab HEMC yog dab tsi?

HPMC (Hydroxypropyl Methylcellulose) thiab HEMC (Hydroxyethyl Methylcellulose) yog ob qho tib si cellulose derivatives uas yog siv los ua thickeners, binders, thiab emulsifiers hauv ntau yam khoom. Lawv ob leeg yog muab los ntawm cellulose, ib tug natural polysaccharide pom nyob rau hauv cov nroj tsuag.

Qhov sib txawv tseem ceeb ntawm HPMC thiab HEMC yog hom hydroxypropyl thiab hydroxyethyl pawg uas txuas nrog cellulose molecule. HPMC muaj hydroxypropyl pawg txuas nrog cellulose molecule, thaum HEMC muaj hydroxyethyl pawg txuas. Qhov sib txawv ntawm hom hydroxypropyl thiab hydroxyethyl pawg no cuam tshuam rau cov khoom ntawm ob lub cellulose derivatives.

HPMC yog ntau soluble nyob rau hauv dej txias dua HEMC, thiab nws yog ntau resistant rau kub hloov. Nws muaj viscosity siab dua HEMC, thiab nws tiv taus acid thiab alkali. Nws kuj tseem tiv taus microbial degradation. HPMC yog siv rau hauv ntau yam khoom, nrog rau cov khoom noj, tshuaj, thiab tshuaj pleev ib ce.

HEMC tsis tshua muaj dej nyob hauv dej txias dua li HPMC, thiab nws tsis tshua muaj kev tiv thaiv qhov kub thiab txias. Nws muaj viscosity qis dua li HPMC, thiab nws tsis tshua muaj zog rau cov kua qaub thiab alkali. Nws tseem tsis tshua muaj resistant rau microbial degradation. HEMC yog siv rau hauv ntau yam khoom, nrog rau cov khoom noj, tshuaj, thiab tshuaj pleev ib ce.

Hauv cov ntsiab lus, HPMC thiab HEMC yog ob qho tib si cellulose derivatives uas yog siv los ua thickeners, binders, thiab emulsifiers hauv ntau yam khoom. Qhov sib txawv tseem ceeb ntawm ob yog hom hydroxypropyl thiab hydroxyethyl pawg uas txuas nrog cellulose molecule. HPMC muaj hydroxypropyl pawg txuas nrog cellulose molecule, thaum HEMC muaj hydroxyethyl pawg txuas. Qhov sib txawv ntawm hom hydroxypropyl thiab hydroxyethyl pawg no cuam tshuam rau cov khoom ntawm ob lub cellulose derivatives.