Itandukaniro riri hagati yo gushonga kwa HPMC ako kanya no gushonga buhoro buhoro

Mu ikoreshwa ryahydroxypropyl methyl cellulose HPMC, ubusanzwe dusanga igabanyijemo ubwoko bubiri: gushonga ako kanya n'ugushonga buhoro buhoro. Reka dusobanukirwe itandukaniro riri hagati yo gushonga vuba no gushonga buhoro buhoro kwa hydroxypropyl methyl cellulose.

HPMC yihuse yerekeza ku ikoreshwa ry'ikintu gihuza ibintu mu gutunganya ubuso mu gikorwa cyo gukora, kugira ngo HPMC ibashe gukwirakwizwa vuba mu mazi akonje, ariko ntabwo ari igisubizo nyacyo, binyuze mu gukurura ibintu bimwe, ubushyuhe buzamuka buhoro buhoro, ni ukuvuga gushonga;

HPMC ishongesha buhoro ishobora no kwitwa ibicuruzwa bishyushye bishongesha. Iyo amazi akonje ahuye nayo, ashobora gukwirakwizwa vuba mu mazi ashyushye. Mu gukangura neza, ubushyuhe bw'umuti buzagabanuka kugera ku bushyuhe runaka. (Ubushyuhe bwa gel yacu ni hafi 60°C), ubushyuhe buzagaragara buhoro buhoro kugeza igihe gel iboneye kandi ifatana ikozwe.

Dore itandukaniro riri hagati y'igisubizo cyihuse n'igisubizo cyihuse. Niba ufite ikibazo kuri ubu bumenyi, ushobora no kutubaza.

Hydroxypropyl methyl celluloseHPMCgutinza amazi ya sima

Kongeramo selulosi ya hydroxypropyl methyl kuri sima bigabanya ubushyuhe bwayo. None se ni iki uzi ku buryo ikora? Reka turebe selulosi ya hydroxypropyl methyl kugira ngo bitinde ubushyuhe bwa sima. Ihame.

1. Igitekerezo cy'indwara yo kugenda kwa iyoni

Twatekereje ko hydroxypropyl methyl cellulose yakongera ubukana bw'ibisubizo by'imyenge, ikabangamira umuvuduko w'ingendo za ioni, kandi igatinza ubukana bw'amazi ya sima. Ariko, eteri za cellulose zimeze nk'izifite ubukana buke muri iki kizamini zari zifite ubushobozi bukomeye bwo gutinza ubukana bw'amazi ya sima. Kubwibyo, iki gitekerezo ntabwo gifite ishingiro. Pourchez n'abandi nabo bashidikanya kuri iki gitekerezo. Mu by'ukuri, igihe cyo kwimuka cyangwa kwimuka kwa ioni ni gito cyane, bigaragara ko kitari kimwe n'igihe cyo gutinda kw'amazi ya sima.

2. Kwangirika kwa alkali

Polysaccharides ziyoyoka byoroshye mu bihe bya alkaline kugira ngo zikore aside hydroxyl carboxylic zitinza amazi ya sima. Kubwibyo, amazi ya hydroxypropyl methyl cellulose atinze ashobora guterwa no kwangirika kwayo mu bice bya sima ya alkaline kugira ngo habeho aside hydroxycarboxylic. Ariko, Pourchez n'abandi basanze ether za cellulose zihamye cyane mu bihe bya alkaline, zangiritse gato gusa, kandi ibicuruzwa byangiritse ntacyo byagize ku gutinda kwa amazi ya sima.

3, uburyo bwo kunyuzamo amazi

Kunyuzwa mu cyuma bishobora kuba hifashishijwe hydroxypropyl methyl cellulose block hydration sima, impamvu nyayo ni uko inyongeramusaruro nyinshi za organic zizanyuzwa ku duce twa sima n'ibikomoka ku mazi, bikarinda gushonga kw'uduce twa sima no gutuma amazi ahinduka, bityo bigatuma sima itinda gushonga no gushonga. Pourchez n'abandi basanze ether za cellulose zinyuzwa mu cyuma ku buryo bworoshye ku buso bw'ibikomoka ku mazi nka calcium hydroxide, CSH gel na calcium aluminate hydrate, ariko ntizinyuzwa mu buryo bworoshye na ettringite n'ibice bitanyuzwa mu mazi. Byongeye kandi, ku bijyanye na ether ya cellulose, ubushobozi bwa HEC bwo kunyuzwa mu cyuma buruta ubwo kubyimba kwa MC. Uko hydroxyethyl muri HEC cyangwa hydroxypropyl iba nke muriHPMC, uko ubushobozi bwo kuvoma bukomera: ku bijyanye n'ibicuruzwa bitonyanga, ubushobozi bwo kuvoma bwa calcium hydroxide buruta ubwa CSH. Isesengura ryinyongera rigaragaza kandi ko ubushobozi bwo kuvoma bw'ibicuruzwa bitonyanga na cellulose ether bifitanye isano no gutinda kw'amazi ya sima: uko kuvoma gukomeye, ni ko gutinda kugaragara, ariko kuvoma kwa etringite ya cellulose ether ni guke, ariko iremwa ryayo riratinda cyane. eteri ya cellulose ya tricalcium silicate n'ibicuruzwa byayo bitonyanga bifite kuvoma gukomeye, birumvikana ko bitinda inzira yo kuvoma ya silicate, ingano yo kuvoma ya ettringite ni nto cyane, ariko kuvoma kwa ettringite biratinda biragaragara, kubera ko kuvoma kwa ettringite bitinze bigira ingaruka kuri Ca 2 + kuringaniza mu gisubizo, ni ukwiyongera kwa eteri ya cellulose. Kuvoma kwa silicate byatinze byarakomeje.

Izi ni ihame rya hydroxypropyl methyl cellulose delay hydration ya sima. Twizeye ko ubu bumenyi buzafasha buri wese gusobanukirwa uburyo iki gicuruzwa gikora no kugikoresha neza.