Itandukaniro hagati yo guhita no gutinda kwa HPMC

Mu ikoreshwa ryahydroxypropyl methyl selulose HPMC, mubisanzwe dusanga igabanijwemo muburyo bubiri: guhita kandi buhoro buhoro. Reka twumve itandukaniro riri hagati yo gusenyuka vuba no gutinda buhoro hydroxypropyl methyl selulose.

HPMC ako kanya bivuga gukoresha imiti ihuza imiti kugirango itunganyirizwe hejuru mubikorwa byumusaruro, kugirango HPMC ishobore gukwirakwira vuba mumazi akonje, ariko ntabwo ari igisubizo nyacyo, binyuze mukubyutsa kimwe, ubwiza bwiyongera buhoro buhoro, ni ukuvuga gusesa;

Buhoro buhoro HPMC irashobora kandi kwitwa ibicuruzwa bishushe. Iyo amazi akonje ahuye, arashobora gukwirakwira vuba mumazi ashyushye. Mugukangura neza, ubushyuhe bwigisubizo buzagabanuka kubushyuhe runaka. (Ubushyuhe bwa gel yacu ni nka 60 ° C), ibishishwa bizagaragara buhoro buhoro kugeza geli ibonerana kandi ifatanye.

Dore itandukaniro riri hagati y igisubizo cyihuse nigisubizo gitinze. Niba ufite ikibazo kijyanye n'ubumenyi, urashobora kandi kutugisha inama.

Hydroxypropyl methyl seluloseHPMCgutinda amazi ya sima

Kwongeramo hydroxypropyl methyl selulose kuri sima bidindiza amazi. None uzi iki kuburyo ikora? Reka turebe hydroxypropyl methyl selulose kugirango itinde amazi ya sima. Ihame.

1. Ion yimikorere idahwitse hypothesis

Twakekereje ko hydroxypropyl methyl selulose yakongera ubukonje bwibisubizo bya pore, bikabangamira umuvuduko wimikorere ya ionic, kandi bigatinda amazi ya sima. Nyamara, epfo na ruguru ya selulose ethers muri iki kizamini yari ifite ubushobozi bukomeye bwo gutinza amazi ya sima. Kubwibyo, iki gitekerezo nticyemewe. Pourchez n'abandi. ushidikanya kandi kuri iyi hypothesis. Mubyukuri, igihe cyo kwimuka kwa ion cyangwa kwimuka ni kigufi cyane, bigaragara ko ntaho bitaniye no gutinda kwa sima.

2. Kwangirika kwa alkaline

Polysaccharide yangirika byoroshye mubihe bya alkaline kugirango itange aside hydroxyl carboxylic acide itinda amazi ya sima. Kubwibyo rero, gutinda kwa hydroxypropyl methyl selulose bishobora guterwa no kwangirika kwayo kwa sima ya alkaline kugirango ibe acide hydroxycarboxylic. Ariko, Pourchez n'abandi. basanze ethers ya selile yari ihagaze neza mubihe bya alkaline, yangiritse gato, kandi ibicuruzwa byangirika ntacyo byagize ku gutinda kwa sima.

3, adsorption

Adsorption irashobora kuba hydroxypropyl methyl selulose block ya sima hydrasiyo nyayo nyayo nuko inyongeramusaruro nyinshi zizajya zamamazwa kubice bya sima nibicuruzwa biva mu mazi, bikarinda gusenyuka kwa sima hamwe no gutondekanya ibicuruzwa biva mu mazi, kugirango bidindiza amazi hamwe na sima. Pourchez n'abandi. yasanze ethers ya selile yoroha cyane hejuru yibicuruzwa bitanga amazi nka calcium hydroxide ya calcium, gel ya CSH na calcium aluminate hydrate, ariko ntibisanzwe byoroshye na ettringite nibice bidafite amazi. Byongeye kandi, kubijyanye na selile ether, ubushobozi bwa adsorption ya HEC irakomeye kuruta iyo kubyimba MC. Hasi ibiri muri hydroxyethyl muri HEC cyangwa hydroxypropyl muriHPMC, imbaraga zikomeye za adsorption: kubijyanye nibicuruzwa bitanga amazi, ubushobozi bwa adsorption ya calcium hydroxide irakomeye kuruta iya CSH. Ubundi isesengura ryerekana kandi ko ubushobozi bwa adsorption bwibicuruzwa bitanga hydrata na selile ya selile bifitanye isano no gutinda kwa hydrata ya sima: uko adsorption ikomera, niko bigaragara gutinda, ariko ettringite adsorption ya selulose ether ifite intege nke, ariko kuyikora, ariko ibi biratinda cyane. selulose ether ya tricalcium silikatike nibicuruzwa byayo bifite hydrata ifite adsorption ikomeye, biragaragara ko bidindiza inzira ya hydratiya yicyiciro cya silikatike, umubare wa adsorption ya ettringite ni muke cyane, ariko gutinda kwa ettringite biragaragara, kubera gutinda kwa ettringite guterwa na Ca 2 + mubisubizo, ni kwaguka kwa selile. Gutinda kwa silikate byatinze byakomeje.

Izi ni hydroxypropyl methyl selulose itinda ihame rya hydrata. Turizera ko ubu bumenyi buzafasha abantu bose kumva uburyo ibicuruzwa bikora no kubikoresha neza.