Ni ubuhe bwoko bwa hydroxypropyl methyl selulose na hydroxyethyl selulose?

1.Hydroxypropyl methyl selulose

Hydroxypropyl methylcelluloseni selile itandukanye ibisohoka nibikoreshwa byiyongera byihuse. Ni selile idafite ionic ivanze ya ether ikozwe mu ipamba itunganijwe nyuma ya alkalisation, ukoresheje okiside ya propylene na methyl chloride nka agent ya etherification, binyuze mubisubizo. Urwego rwo gusimbuza muri rusange ni 1.2 ~ 2.0. Imiterere yacyo iratandukanye bitewe nikigereranyo cyibintu bya vitoxyl hamwe na hydroxypropyl.

(1) Hydroxypropyl methylcellulose irashobora gushonga byoroshye mumazi akonje, kandi izahura ningorane zo gushonga mumazi ashyushye. Ariko ubushyuhe bwacyo bwo mumazi ashyushye buri hejuru cyane ugereranije na methyl selile. Ubushyuhe bwo mumazi akonje nabwo buratera imbere cyane ugereranije na methyl selulose.

(2). Ubushyuhe nabwo bugira ingaruka ku bwenge bwabwo, uko ubushyuhe bwiyongera, ubukonje bugabanuka. Nyamara, ingaruka zubukonje bwazo nubushyuhe buri munsi ugereranije na methyl selile. Igisubizo cyacyo gihamye iyo kibitswe mubushyuhe bwicyumba.

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(4) Hydroxypropyl methylcellulose ihamye kuri aside na alkali, kandi igisubizo cyayo cyamazi kirahagaze neza murwego rwa pH = 2 ~ 12. Soda ya Caustic n'amazi ya lime ntacyo bihindura mubikorwa byayo, ariko alkali irashobora kwihutisha umuvuduko wayo kandi ikongerera gato ububobere bwayo. Hydroxypropyl methylcellulose ihagaze neza kumunyu usanzwe, ariko iyo ubunini bwumuti wumunyu mwinshi, ubwiza bwumuti wa hydroxypropyl methylcellulose bikunda kwiyongera.

. Nka alcool ya polyvinyl, ibinyamisogwe ether, amase y'imboga, nibindi.

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2. Hydroxyethyl selulose

Ikozwe mu ipamba inoze ivurwa na alkali, ikanakoreshwa na okiside ya Ethylene nka agent ya etherification imbere ya isopropanol. Urwego rwo gusimbuza muri rusange ni 1.5 ~ 2.0. Ifite hydrophilicity ikomeye kandi byoroshye gukuramo ubuhehere.

(1) Hydroxyethyl selulose irashobora gushonga mumazi akonje, ariko biragoye gushonga mumazi ashyushye. Igisubizo cyacyo gihamye mubushyuhe bwo hejuru nta geli. Irashobora gukoreshwa igihe kirekire munsi yubushyuhe bwo hejuru muri minisiteri, ariko kubika amazi yayo biri munsi yubwa methyl selile.

(2)Hydroxyethyl selileihamye kuri acide rusange na alkali, kandi alkali irashobora kwihutisha iseswa kandi ikongerera gato ububobere bwayo. Ikwirakwizwa ryayo mumazi ni mabi cyane ugereranije na methyl selulose na hydroxypropyl methyl selulose.

(3) Hydroxyethyl selulose ifite imikorere myiza yo kurwanya-sag kuri minisiteri, ariko ifite igihe kirekire cyo kudindiza sima.

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(5) Indwara yumuti wamazi wa hydroxyethyl selulose irakomeye. Ku bushyuhe bwa 40 ° C, indwara ishobora kugaragara mu minsi 3 kugeza kuri 5, izagira ingaruka ku mikorere yayo.