Cellulose ether ni polymer ivanze ikomatanyirizwa muri selile isanzwe binyuze muri etherification, kandi nikintu cyiza cyane kandi kigumana amazi.
Amavu n'amavuko
Ether ya selile yakoreshejwe cyane muri minisiteri ivanze yumye mumyaka yashize, ikoreshwa cyane ni ethers zimwe na zimwe zitari ionic selulose ether, harimo methyl selulose ether (MC), hydroxyethyl selulose ether (HEC), hydroxyethyl selulose ether Methyl selulose ether (HEMC) ) na hydroxypropyl methyl selulose ether (HPMC).Kugeza ubu, ntabwo ubuvanganzo bwinshi buhari kuburyo bwo gupima ubwiza bwa selulose ether igisubizo.Mu gihugu cyacu, gusa ibipimo na monografiya ni byo byerekana uburyo bwo kwipimisha ubwiza bwumuti wa selile.
Uburyo bwo gutegura selile ya ether igisubizo
Gutegura Methyl Cellulose Ether Igisubizo
Methyl selulose ethers yerekeza kuri selile ya selile irimo amatsinda ya methyl muri molekile, nka MC, HEMC na HPMC.Bitewe na hydrophobicite yitsinda rya methyl, ibisubizo bya selile ya selile irimo amatsinda ya methyl bifite imiterere ya gelation yumuriro, ni ukuvuga ko idashobora gushonga mumazi ashyushye kubushyuhe burenze ubushyuhe bwabyo (hafi 60-80 ° C).Kugirango wirinde igisubizo cya selulose ether gukora agglomerates, shyushya amazi hejuru yubushyuhe bwa gel, hafi 80 ~ 90 ° C, hanyuma ushyiremo ifu ya selulose ether mumazi ashyushye, ukangure kugirango ukwirakwize, komeza gukurura no gukonja Kuri seti ubushyuhe, irashobora gutegurwa muburyo bumwe bwa selile ether igisubizo.
Ibisubizo bya solibilité ya methylcellulose irimo ethers
Mu rwego rwo kwirinda igiteranyo cya selile ya selile mu gihe cyo gusesa, abayikora rimwe na rimwe bakora imiti y’imiti ku bicuruzwa byifu ya selulose ether kugirango batinde guseswa.Igikorwa cyacyo cyo gusesa kibaho nyuma ya selile ya selile imaze gutatanwa burundu, kuburyo ishobora gukwirakwizwa mumazi akonje hamwe nagaciro ka pH idafite aho ibogamiye itagize agglomerates.Iyo hejuru ya pH agaciro k'igisubizo, nigihe gito cyo gusesa kwa selile ether hamwe nibintu byatinze guseswa.Hindura pH agaciro k'igisubizo ku giciro cyo hejuru.Alkalinite izakuraho gutinda gukemuka kwa selile ya selile, bigatuma ether ya selile ikora agglomerate mugihe ishonga.Kubwibyo, pH agaciro k'igisubizo igomba kuzamurwa cyangwa kumanurwa nyuma ya selile ya selile imaze gutatana burundu.
Imiterere ya solubilité yubutaka bwavuwe na methylcellulose irimo ethers
Gutegura Hydroxyethyl Cellulose Ether Igisubizo
Hydroxyethyl selulose ether (HEC) igisubizo ntigifite umutungo wogukoresha ubushyuhe, kubwibyo, HEC itavuwe hejuru nayo izakora agglomerate mumazi ashyushye.Muri rusange abayikora bakora imiti yubutaka kuri poro ya HEC kugirango batinde guseswa, kugirango ishobore gukwirakwizwa mumazi akonje ifite agaciro ka pH idafite aho ibogamiye.Mu buryo nk'ubwo, mu gisubizo gifite alkaline nyinshi, HEC Irashobora kandi gukora agglomerates kubera gutinda kubura imbaraga.Kubera ko isima ya sima ari alkaline nyuma yo kuvomera kandi pH igiciro cyumuti kiri hagati ya 12 na 13, igipimo cyo gusesa hejuru ya selile yakozwe na selile ya ether muri sima ya sima nayo irihuta cyane.
Gukemura ibibazo bya HEC
Umwanzuro n'isesengura
1. Uburyo bwo gutatanya
Kugirango wirinde ingaruka mbi mugihe cyibizamini bitewe no gushonga gahoro gahoro ibintu bivura hejuru, birasabwa gukoresha amazi ashyushye mugutegura.
2. Uburyo bwo gukonjesha
Cellulose ether ibisubizo bigomba gukangurwa no gukonjeshwa kubushyuhe bwibidukikije kugirango bigabanye umuvuduko ukonje, bisaba igihe kinini cyo kwipimisha.
3. Gukurura inzira
Nyuma ya selile ya selile yongewe mumazi ashyushye, menya neza ko ukomeza kubyutsa.Iyo ubushyuhe bwamazi bugabanutse munsi yubushyuhe bwa gel, ether ya selile izatangira gushonga, kandi igisubizo kizagenda gihinduka buhoro buhoro.Muri iki gihe, umuvuduko ukurura ugomba kugabanuka.Igisubizo kimaze kugera mubwiza runaka, bugomba guhagarara kumasaha arenga 10 mbere yuko ibibyimba bireremba buhoro buhoro hejuru kugirango biturike bikabura.
Umwuka wo mu kirere muri Cellulose Ether Igisubizo
4. Uburyo bwo kuyobora
Ubwiza bwa ether ya selulose n'amazi bigomba gupimwa neza, kandi ukagerageza kudategereza ko igisubizo kigera hejuru cyane mbere yo kuzuza amazi.
5. Ikizamini cya Viscosity
Bitewe na thixotropy yumuti wa selulose ether, mugihe ugerageza ububobere bwayo, mugihe rotor ya viscometer izunguruka yinjijwe mubisubizo, bizahungabanya igisubizo kandi bigira ingaruka kubisubizo byo gupima.Kubwibyo, nyuma ya rotor yinjijwe mubisubizo, igomba kwemererwa guhagarara iminota 5 mbere yo kwipimisha.
Igihe cyo kohereza: Werurwe-22-2023