Qhov txawv ntawm HPMC thiab HEC

Ob leeg hydroxypropyl methylcellulose thiab hydroxyethyl cellulose yog cellulose, qhov txawv ntawm ob yog dab tsi?

"Qhov txawv ntawm HPMC thiab HEC"

01 HPMC thiab HEC
Hydroxypropyl methylcellulose (Hypromellose), tseem hu ua hypromellose, yog ib hom non-ionic cellulose tov ether. Nws yog ib qho semisynthetic, tsis muaj zog, viscoelastic polymer feem ntau siv los ua cov roj nplua nyeem hauv ophthalmology, lossis ua ib qho khoom siv lossis tsheb hauv cov tshuaj hauv qhov ncauj.
Hydroxyethyl cellulose (HEC), chemical formula (C2H6O2)n, yog dawb los yog lub teeb daj, tsis muaj ntxhiab, tsis muaj tshuaj lom fibrous los yog hmoov khoom muaj li ntawm alkaline cellulose thiab ethylene oxide (los yog chloroethanol) Nws yog npaj los ntawm etherification thiab belongs rau non- ionic soluble cellulose ethers. Vim HEC muaj cov khoom zoo ntawm thickening, suspending, dispersing, emulsifying, bonding, film-forming, tiv thaiv ya raws thiab muab kev tiv thaiv colloid, nws tau siv dav hauv kev tshawb nrhiav roj, txheej txheej, kev tsim kho, tshuaj thiab zaub mov, textile, ntawv thiab polymer polymerization. thiab lwm yam teb, 40 mesh sieving tus nqi ≥ 99%.

02 txawv
Txawm hais tias ob qho tib si yog cellulose, muaj ntau qhov sib txawv ntawm ob:
Hydroxypropyl methylcellulose thiab hydroxyethylcellulose sib txawv hauv cov khoom, siv, thiab solubility.

1. Cov yam ntxwv sib txawv
Hydroxypropyl methylcellulose: (HPMC) yog dawb los yog zoo li dawb fiber ntau los yog granular hmoov, teej tug mus rau ntau yam nonionic cellulose tov ethers. Nws yog ib tug semi-synthetic uas tsis yog-nyob viscoelastic polymer.
Hydroxyethylcellulose: (HEC) yog xim dawb lossis daj, tsis muaj ntxhiab thiab tsis muaj tshuaj lom fiber ntau lossis hmoov khoom. Nws yog etherified los ntawm alkaline cellulose thiab ethylene oxide (los yog chlorohydrin). Nws belongs rau non-ionic soluble cellulose ether.

2. Sib txawv solubility
Hydroxypropyl methylcellulose: yuav luag insoluble hauv ethanol, ether thiab acetone. Clear los yog me ntsis cloudy colloidal tov yaj nyob rau hauv dej txias.
Hydroxyethyl cellulose: Nws muaj cov khoom ntawm thickening, suspending, khi, emulsifying, dispersing thiab moisturizing. Nws tuaj yeem npaj cov kev daws teeb meem hauv ntau qhov sib txawv viscosity thiab muaj cov ntsev solubility zoo heev rau electrolytes.
Hydroxypropyl methylcellulose muaj cov yam ntxwv ntawm thickening peev xwm, tsis tshua muaj ntsev tsis kam, pH stability, dej tuav, seem stability, zoo heev zaj duab xis-tsim zog, nws kim heev enzyme kuj, dispersibility thiab cohesiveness.

Muaj ntau qhov sib txawv ntawm ob, thiab lawv cov txiaj ntsig hauv kev lag luam kuj txawv heev.

Hydroxypropyl methylcellulose feem ntau yog siv los ua cov thickener, dispersant thiab stabilizer hauv kev lag luam txheej, thiab muaj cov solubility zoo hauv dej lossis cov kuab tshuaj organic. Hauv kev tsim kho kev lag luam, nws tuaj yeem siv rau hauv cov cement, gypsum, latex putty, plaster, thiab lwm yam, txhawm rau txhim kho qhov tawg ntawm cov cement xuab zeb thiab zoo heev txhim kho cov yas thiab dej tuav ntawm mortar.
Hydroxyethyl cellulose muaj cov khoom ntawm thickening, suspending, khi, emulsifying, dispersing thiab moisturizing. Nws tuaj yeem npaj cov kev daws teeb meem hauv ntau qhov sib txawv viscosity thiab muaj cov ntsev solubility zoo heev rau electrolytes. Hydroxyethyl cellulose yog ib qho zoo zaj duab xis qub, tackifier, thickener, stabilizer thiab dispersant nyob rau hauv tshuaj zawv plaub hau, tshuaj tsuag plaub hau, neutralizers, conditioners thiab tshuaj pleev ib ce; nyob rau hauv ntxuav hmoov Nyob rau hauv nruab nrab yog ib hom av redeposition agent. Hydroxyethyl cellulose yaj sai sai ntawm qhov kub thiab txias, uas tuaj yeem ua kom cov txheej txheem ntau lawm thiab txhim kho kev tsim khoom. Qhov pom tseeb ntawm cov tshuaj ntxuav tes uas muaj hydroxyethyl cellulose yog tias nws tuaj yeem txhim kho qhov smoothness thiab mercerization ntawm fabrics.