Farqiga u dhexeeya HPMC iyo HEC

Labada hydroxypropyl methylcellulose iyo hydroxyethyl cellulose waa cellulose, waa maxay faraqa u dhexeeya labada?

"Farqiga u dhexeeya HPMC iyo HEC"

01 HPMC iyo HEC
Hydroxypropyl methylcellulose (Hypromellose), oo sidoo kale loo yaqaan hypromellose, waa nooc ka mid ah cellulose isku dhafan oo aan ionic ahayn. Waa polymer nus-synthetic ah, aan firfircoonayn, viscoelastic ah oo badanaa loo isticmaalo saliid ahaan daaweynta indhaha, ama sidii qalab ama gaari daawooyinka afka laga qaato.
Hydroxyethyl cellulose (HEC), oo ah qaacidada kiimikada (C2H6O2)n, waa huruud cad ama khafiif ah, aan ur lahayn, aan sun ahayn oo adag oo ah fibrous ama budo ah oo ka kooban alkaline cellulose iyo ethylene oxide (ama chloroethanol). Waxaa lagu diyaariyaa etherification waxayna ka tirsan tahay ethers cellulose-ka milma ee aan ionic ahayn. Sababtoo ah HEC waxay leedahay sifooyin wanaagsan oo ah dhumuc, suul, kala firdhi, emulsifying, isku xidhka, sameynta filimada, ilaalinta qoyaanka iyo bixinta colloid ilaalin ah, waxaa si weyn loogu isticmaalay sahaminta saliidda, dahaarka, dhismaha, daawada iyo cuntada, dharka, warqadda iyo polymer Polymerization iyo beeraha kale, 40 mesh sifting rate ≥ 99%.

02 farqi
In kasta oo labaduba ay yihiin cellulose, haddana waxaa jira farqiyo badan oo u dhexeeya labada:
Hydroxypropyl methylcellulose iyo hydroxyethylcellulose way ku kala duwan yihiin sifooyinka, isticmaalka, iyo milmida.

1. Sifooyin Kala Duwan
Hydroxypropyl methylcellulose: (HPMC) waa budo cad ama faybar cad oo la mid ah, oo ka tirsan noocyo kala duwan oo ah ethers cellulose isku dhafan oo aan ionic ahayn. Waa polymer viscoelastic ah oo aan noolayn oo nus-synthetic ah.
Hydroxyethylcellulose: (HEC) waa faybar cad ama jaalle ah, aan ur lahayn oo aan sun ahayn ama budo adag. Waxaa ether ku sameeya alkaline cellulose iyo ethylene oxide (ama chlorohydrin). Waxay ka tirsan tahay cellulose ether-ka milma ee aan ionic ahayn.

2. Milmida kala duwan
Hydroxypropyl methylcellulose: ku dhawaad ​​​​aan ku milmin ethanol buuxa, ether iyo acetone. Xalka kolloidal ee cad ama xoogaa daruuraysan oo lagu milmay biyo qabow.
Hydroxyethyl cellulose: Waxay leedahay sifooyinka dhumucda, suulinta, xidhitaanka, emulsifying, kala firdhinta iyo qoyaanka. Waxay diyaarin kartaa xalal leh kala duwanaansho kala duwan waxayna leedahay milmi milix oo aad u fiican oo loogu talagalay elektrolytyada.
Hydroxypropyl methylcellulose waxay leedahay astaamo ay ka mid yihiin awoodda dhumucda, iska caabbinta milixda oo hooseysa, xasilloonida pH, haynta biyaha, xasilloonida cabbirka, sifooyinka sameynta filimada oo aad u fiican, iska caabbinta ensaymka oo ballaaran, kala firdhinta iyo isku xirnaanta.

Waxaa jira farqiyo badan oo u dhexeeya labada, faa'iidada ay u leeyihiin warshadaha sidoo kale aad ayay u kala duwan yihiin.

Hydroxypropyl methylcellulose waxaa inta badan loo isticmaalaa sidii dhumuc-dheg, kala-firdhiye iyo xasiliye warshadaha dahaarka, waxayna leedahay milmi wanaagsan oo ku jira biyaha ama dareere dabiici ah. Warshadaha dhismaha, waxaa loo isticmaali karaa sibidhka, gypsum, latex putty, plaster, iwm., si loo hagaajiyo kala-firdhinta ciidda sibidhka iyo si weyn loo hagaajiyo balaastikada iyo haysashada biyaha ee hoobiyaha.
Hydroxyethyl cellulose waxay leedahay sifooyinka dhumucda, sugidda, xidhitaanka, emulsifying, firdhinta iyo qoyaanka. Waxay diyaarin kartaa xalal kala duwan oo dheellitiran waxayna leedahay milmi milix oo aad u fiican oo loogu talagalay elektrolytyada. Hydroxyethyl cellulose waa filim wax ku ool ah, tackifier, dhumuc-saare, xasiliye iyo kala firdhiye shaambo, buufin timaha, dhexdhexaadiyeyaasha, qaboojiyeyaasha iyo qurxinta; budada dharka lagu dhaqo. Bartamaha waxaa ku jira nooc ka mid ah wakiilka dib-u-soo-celinta wasakhda. Hydroxyethyl cellulose si dhakhso ah ayuu u milmaa heerkulka sare, kaas oo dedejin kara habka wax soo saarka oo hagaajin kara waxtarka wax soo saarka. Astaamaha muuqda ee saabuunta ay ku jiraan hydroxyethyl cellulose waa inay hagaajin karto simanaanta iyo mercerization ee dharka.