Qhov Sib Txawv Ntawm HPMC thiab HEC

Ob qho tib si hydroxypropyl methylcellulose thiab hydroxyethyl cellulose yog cellulose, qhov txawv ntawm ob qho no 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 mixed ether. Nws yog ib qho semisynthetic, inactive, viscoelastic polymer feem ntau siv ua lubricant hauv ophthalmology, lossis ua ib qho excipient lossis tsheb hauv cov tshuaj noj.
Hydroxyethyl cellulose (HEC), tshuaj mis (C2H6O2) n, yog dawb los yog daj daj, tsis muaj ntxhiab, tsis muaj tshuaj lom fibrous lossis powdery khoom uas muaj alkaline cellulose thiab ethylene oxide (lossis chloroethanol). Nws yog npaj los ntawm etherification thiab yog cov non-ionic soluble cellulose ethers. Vim tias HEC muaj cov khoom zoo ntawm thickening, suspending, dispersing, emulsifying, bonding, zaj duab xis-forming, tiv thaiv noo noo thiab muab kev tiv thaiv colloid, nws tau siv dav hauv kev tshawb nrhiav roj, coatings, kev tsim kho, tshuaj thiab zaub mov, textile, ntawv thiab polymer Polymerization thiab lwm yam teb, 40 mesh sieving tus nqi ≥ 99%.

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

1. Cov yam ntxwv sib txawv
Hydroxypropyl methylcellulose: (HPMC) yog dawb los yog zoo sib xws dawb fiber los yog hmoov granular, koom nrog ntau yam nonionic cellulose sib xyaw ethers. Nws yog ib qho semi-synthetic non-living viscoelastic polymer.
Hydroxyethylcellulose: (HEC) yog ib hom fiber dawb los yog daj, tsis muaj ntxhiab thiab tsis muaj tshuaj lom lossis hmoov. Nws yog etherified los ntawm alkaline cellulose thiab ethylene oxide (lossis chlorohydrin). Nws yog ib hom cellulose ether uas tsis yog ionic soluble.

2. Kev sib txawv ntawm kev yaj
Hydroxypropyl methylcellulose: yuav luag tsis yaj hauv ethanol, ether thiab acetone. Cov kua colloidal ntshiab lossis me ntsis pos huab yaj hauv dej txias.
Hydroxyethyl cellulose: Nws muaj cov yam ntxwv ntawm kev ua kom tuab, kev ncua, kev khi, emulsifying, kev tawg thiab kev noo noo. Nws tuaj yeem npaj cov tshuaj hauv ntau qhov viscosity sib txawv thiab muaj kev yaj ntsev zoo heev rau electrolytes.
Hydroxypropyl methylcellulose muaj cov yam ntxwv ntawm kev ua kom tuab, tsis tshua muaj ntsev, pH ruaj khov, khaws dej, ruaj khov, muaj zog zoo, ua yeeb yaj kiab zoo heev, tiv taus enzyme ntau, dispersibility thiab cohesiveness.

Muaj ntau qhov sib txawv ntawm ob qho no, thiab lawv qhov muaj txiaj ntsig hauv kev lag luam kuj txawv heev.

Hydroxypropyl methylcellulose feem ntau yog siv ua thickener, dispersant thiab stabilizer hauv kev lag luam txheej, thiab muaj kev yaj zoo hauv dej lossis cov kuab tshuaj organic. Hauv kev lag luam kev tsim kho, nws tuaj yeem siv rau hauv cement, gypsum, latex putty, plaster, thiab lwm yam, los txhim kho kev yaj ntawm cov xuab zeb cement thiab txhim kho qhov plasticity thiab dej khaws cia ntawm mortar.
Hydroxyethyl cellulose muaj cov yam ntxwv ntawm kev ua kom tuab, ncua, khi, emulsifying, dispersing thiab moisturizing. Nws tuaj yeem npaj cov tshuaj hauv ntau yam viscosity thiab muaj cov ntsev zoo heev rau electrolytes. Hydroxyethyl cellulose yog ib qho ua kom zoo nkauj zaj duab xis, tackifier, thickener, stabilizer thiab dispersant hauv tshuaj zawv plaub hau, tshuaj tsuag plaub hau, neutralizers, conditioners thiab tshuaj pleev ib ce; hauv cov hmoov ntxhua khaub ncaws Hauv nruab nrab yog ib hom av redeposition tus neeg sawv cev. Hydroxyethyl cellulose yaj sai sai ntawm qhov kub siab, uas tuaj yeem ua kom cov txheej txheem ntau lawm sai dua thiab txhim kho kev ua haujlwm ntau lawm. Qhov pom tseeb ntawm cov tshuaj ntxuav tes uas muaj hydroxyethyl cellulose yog tias nws tuaj yeem txhim kho qhov du thiab mercerization ntawm cov ntaub.