Ubwino wa Hydroxypropyl Methyl Cellulose

Hydroxypropyl methylcellulose amayengedwa kuchokera ku thonje pambuyo pa alkalization, pogwiritsa ntchito propylene oxide ndi methyl chloride ngati etherification agents, ndipo amakumana ndi zochitika zingapo kuti apange non-ionic cellulose mix ether. Hydroxypropyl methylcellulose ndi ether yosakhala ionic cellulose, yoyera m'mawonekedwe, yopanda fungo komanso yosakoma. Mlingo wolowa m'malo nthawi zambiri . Katundu wake amasiyana malinga ndi kuchuluka kwa methoxyl zomwe zili ndi hydroxypropyl.

Choyamba, yang'anani kaphatikizidwe ka hydroxypropyl methylcellulose:

The woyengedwa thonje mapadi amathandizidwa ndi alkali solution pa 35-40 ° C kwa theka la ola, mbande, ndipo mapadi ndi pulverized pa 35 ° C ndi bwino okalamba, kotero kuti pafupifupi digiri ya polymerization wa anapeza alkali CHIKWANGWANI mkati mwa mtunda wofunikira. Ikani ulusi wa alkali mu thanki ya etherification, onjezerani propylene oxide ndi methyl chloride motsatizana, etherify pa 50-80 ° C kwa maola 5, ndipo kupanikizika kwakukulu ndi pafupifupi. Kenaka yikani mlingo woyenera wa hydrochloric acid ndi oxalic acid kumadzi otentha pa 90 ° C kuti muwonjezere voliyumuyo. Dehydrate mu centrifuge. Chinyontho chikatsika kuposa 60%, chisambitseni kuti chisalowerere, kenako chiwume mpaka pansi pa 5% ndi mpweya wotentha wa 130 ° C. Pomaliza anaphwanya sieve ya ma mesh 20 kuti mupeze chomaliza.

Zogulitsa za Hydroxypropyl Methyl Cellulose:

1. Hydroxypropyl methylcellulose imasungunuka mosavuta m'madzi ozizira ndipo imasungunuka m'madzi otentha. Komabe, kutentha kwake kwa gelation m'madzi otentha ndipamwamba kwambiri kuposa methylcellulose. Kusungunuka m'madzi ozizira kumakhalanso bwino kwambiri kuposa methyl cellulose.

2. Viscosity ya hydroxypropyl methylcellulose imagwirizana ndi kulemera kwa maselo, ndipo kukhuthala kumakhala kwakukulu pamene kulemera kwa maselo kuli kwakukulu. Kutentha kumakhudzanso kukhuthala kwake, pamene kutentha kumawonjezeka, kukhuthala kumachepa. Koma kukhuthala kwake kwakukulu ndikotsika kuposa methyl cellulose. Yankho lake ndi lokhazikika kutentha.

Mphamvu yosungira madzi ya hydroxypropyl methylcellulose imadalira kuchuluka kwake, kukhuthala kwake, ndi zina zambiri, ndipo kuchuluka kwake kosungira madzi ndikwambiri kuposa kwa methyl cellulose.

3. Hydroxypropyl methylcellulose imakhala yokhazikika ku asidi ndi alkali, ndipo njira yake yamadzimadzi imakhala yokhazikika mu pH = 2-12. Koloko ndi madzi a mandimu alibe mphamvu zochepa pa katundu wake, koma zamchere zimatha kufulumizitsa kusungunuka kwake ndikuwonjezera kukhuthala kwake pang'ono. Hydroxypropyl methylcellulose ndi yokhazikika ku mchere wamba, koma pamene mchere wa mchere uli wambiri, kukhuthala kwa hydroxypropyl methylcellulose solution kumawonjezeka.

4. Hydroxypropyl methylcellulose ikhoza kusakanikirana ndi ma polima osungunuka m'madzi kuti apange yunifolomu, high-viscosity solution. Monga polyvinyl mowa, nyanja madzi ufa efa, masamba chingamu, etc.

Hydroxypropyl methylcellulose imakhala ndi kukana bwino kwa enzyme kuposa methylcellulose, ndipo yankho lake silingawonongeke kwambiri kuposa methylcellulose.

5. Kulumikizana pakati pa hydroxypropyl methylcellulose ndi kapangidwe ka matope ndipamwamba kuposa methylcellulose.

Mtondo wosakanizidwa ndi madzi ndi simenti, kuphatikiza bwino, zowonjezera ndi madzi, ndipo zigawo zosiyanasiyana zimatsimikiziridwa malinga ndi ntchito. Kusakaniza kumayesedwa ndi kusakaniza pa chiŵerengero china pa malo osakaniza, kusakaniza kumatengedwa kupita kumalo ogwiritsidwa ntchito ndi galimoto yosakaniza ndikusungidwa mu chidebe chapadera, ndipo kusakaniza konyowa kumagwiritsidwa ntchito mkati mwa nthawi yeniyeni.

Momwe mungaweruzire mtundu wa hydroxypropyl methylcellulose?

Tikayang'ana ubwino wa hydroxypropyl methylcellulose makamaka zimadalira zizindikiro ziwiri, imodzi ndi digiri ya m'malo (DS) ndipo ina ndi chiyero. Nthawi zambiri, katundu wa carboxymethyl cellulose ndi wosiyana ngati kuchuluka kwa m'malo kuli kosiyana; kumtunda kwa mlingo woloweza m'malo, kumapangitsanso kusungunuka kwamphamvu, komanso bwino kuwonekera ndi kukhazikika kwa yankho. Malinga ndi malipoti ofunikira, kuwonekera kwa carboxymethyl cellulose ndikwabwino pomwe kuchuluka kwa m'malo kuli ~, komanso kukhuthala kwake kwamadzi am'madzi kumakhala kwakukulu pamene pH mtengo ndi 6-9. Ndiko kuti, kuyeza khalidwe la carboxymethyl mapadi, m'pofunika kumvetsa bwino mlingo wake m'malo ndi chiyero. Zizindikiro ziwirizi zimakwaniritsa zofunikira, zomwe zikutanthauza kuti khalidwe lake ndi labwino kwambiri.