Focus on Cellulose ethers

Ni irihe tandukaniro riri hagati ya HPMC na MC?

A:

MC ni methyl selulose: itunganijwe neza nyuma yo kuvura alkali, methane chloride nka etherifying agent, binyuze murukurikirane rwibikorwa byo gukora selile. Mubisanzwe, urwego rwo gusimburwa ni 1.6 ~ 2.0, kandi gukemura biratandukanye nurwego rwo gusimburwa. Biri muri nonionic selulose ether.

. Mubisanzwe ongeramo umubare munini, ubwiza buto, viscosity, igipimo cyo gufata amazi ni kinini. Ingano yinyongeramusaruro igira uruhare runini ku kigero cyo gufata amazi, kandi ubukonje ntabwo buhwanye n’igipimo cyo gufata amazi. Igipimo cyo guseswa ahanini biterwa nuburinganire bwo hejuru hamwe nuburinganire bwa selile. Muri ethers nyinshi za selile, methyl selulose na HPMC hydroxypropyl methyl selulose igipimo cyo gufata amazi kiri hejuru.

(2) Methyl selulose irashobora gushonga mumazi akonje, bigoye gushonga mumazi ashyushye. Igisubizo cyamazi cyacyo kirahagaze neza muri pH = 3 ~ 12. Ifite guhuza neza na krahisi, guanidine gum na surfactants nyinshi. Gelation ibaho iyo ubushyuhe bugeze ku bushyuhe bwa gelation.

(3) Ihinduka ry'ubushyuhe rizagira ingaruka zikomeye ku kigero cyo gufata amazi ya methyl selile. Mubisanzwe, uko ubushyuhe buri hejuru, niko gufata amazi ari bibi. Niba ubushyuhe bwa minisiteri burenze 40 ℃, kugumana amazi ya methyl selulose bizaba bibi cyane, bigira ingaruka zikomeye kumyubakire ya minisiteri.

(4) Methyl selulose igira uruhare rugaragara mukubaka no gufatira minisiteri. “Adhesion” hano yerekeza ku gufatira umukozi kumva hagati yigikoresho na substrate y'urukuta, aribyo kurwanya inkweto za minisiteri. Adhesion nini, kurwanya shear ya minisiteri nini, imbaraga zisabwa nabakozi mugikorwa cyo gukoresha nazo nini, kandi kubaka minisiteri ni bibi. Mubicuruzwa bya selile ya selile, gufatira methyl selulose kurwego ruciriritse.

HPMC ni hydroxypropyl methyl selulose: ikozwe mu ipamba itunganijwe nyuma yo kuvurwa alkali, hamwe na okiside ya propylene na chloromethane nka agent ya etherifying, binyuze murukurikirane rwibisubizo kandi bikozwe muri ether ya selile idafite ionic. Urwego rwo gusimbuza muri rusange ni 1.2 ~ 2.0. Imiterere yacyo iratandukanye nigipimo cyimikorere na hydroxypropyl.

(1) HPMC hydroxypropyl methyl selulose irashobora gushonga byoroshye mumazi akonje, bigoye gushonga mumazi ashyushye. Nyamara, ubushyuhe bwa gelation mumazi ashyushye biragaragara ko burenze ubwa methyl selile. Ubushobozi bwa methyl selulose mumazi akonje nabwo bwatejwe imbere cyane.

. Ubushyuhe nabwo bugira ingaruka ku bwijimye. Ubushuhe buragabanuka uko ubushyuhe bwiyongera. Ariko ubukonje bwacyo hejuru yubushyuhe buri munsi yubwa methyl selile. Igisubizo kirahamye iyo kibitswe mubushyuhe bwicyumba.

. Caustic soda namazi yindimu ntacyo bihindura kumiterere yabyo, ariko alkali irashobora kwihutisha umuvuduko wacyo kandi igatera ubwiza. HPMC hydroxypropyl methyl selulose ihagaze neza kumunyu rusange, ariko iyo ubwinshi bwumuti wumunyu mwinshi, ubwiza bwumuti wa HPMC hydroxypropyl methyl selulose ikunda kwiyongera.

.

. Nka alcool ya polyvinyl, krahisi ether, kole yimboga nibindi.

.

.


Igihe cyo kohereza: Gicurasi-26-2022
Ikiganiro cya WhatsApp Kumurongo!