Momwe mungaweruzire mtundu wa Hydroxypropyl Methyl Cellulose HPMC?

(1). Kusiyana pakati pa hydroxypropyl methylcellulose (HPMC) ndi pure hydroxypropyl methylcellulose (HPMC)
1. Maonekedwe: Pure hydroxypropyl methylcellulose HPMC ikuwoneka ngati fluffy ndipo imakhala ndi kachulukidwe kakang'ono, kuyambira 0.3-0.4g/ml; HPMC ya hydroxypropyl methylcellulose imakhala ndi madzi abwinoko ndipo imamva kulemera kwambiri, ndipo pali kusiyana kwakukulu kwa maonekedwe kuchokera ku mankhwala enieni.
2. Mkhalidwe: Pure hydroxypropyl methylcellulose HPMC ufa ndi fibrous pansi pa microscope kapena galasi lokulitsa; pomwe hydroxypropyl methylcellulose HPMC imatha kuwonedwa ngati zolimba zolimba kapena makhiristo pansi pa maikulosikopu kapena galasi lokulitsa.

3. Fungo: Koyera hydroxypropyl methylcellulose HPMC sangakhoze kununkhiza fungo la ammonia, wowuma ndi mowa; HPMC imatha kununkhiza fungo lamitundu yonse, ngakhale itakhala yosakoma, imamva kulemera.
4. Yankho lamadzimadzi: koyera hydroxypropyl methylcellulose HPMC amadzimadzi njira yomveka bwino, kuwala kwapamwamba transmittance, madzi posungira mlingo ≥ 97%; HPMC amadzimadzi yothetsera hydroxypropyl methylcellulose ndi turbid, ndipo mlingo posungira madzi ndi kovuta kufika 80%.

(2), kusungirako madzi kwa hydroxypropyl methylcellulose HPMC, kusiyanitsa zabwino ndi zoyipa:

Kusungidwa kwa madzi kwa methyl cellulose ether pansi pa kutentha kwakukulu ndi chizindikiro chofunikira kusiyanitsa ubwino wa methyl cellulose ether. Zinthu monga kutentha kwa mpweya, kutentha ndi kuthamanga kwa mphepo zidzakhudza kusinthasintha kwa madzi mumatope a simenti ndi zinthu zopangidwa ndi gypsum. Chifukwa chake, munyengo zosiyanasiyana, pali kusiyana kwina pakusunga madzi pazinthu zomwe zili ndi kuchuluka komweko kwa HPMC. Pakumanga kwapadera, mphamvu yosungira madzi ya slurry imatha kusinthidwa ndikuwonjezera kapena kuchepetsa kuchuluka kwa HPMC yowonjezeredwa. Zabwino kwambiri hydroxypropyl methylcellulose HPMC mankhwala amatha kuthetsa vuto la kusunga madzi kutentha kwambiri.

Apamwamba methylcellulose akhoza uniformly ndi mogwira omwazika mu simenti matope ndi gypsum ofotokoza mankhwala, ndi kukulunga particles onse olimba, ndi kupanga kunyowetsa filimu, chinyezi m'munsi ndi pang'onopang'ono anamasulidwa kwa nthawi yaitali, ndi inorganic The hydration anachita. za gelled zakuthupi zimatsimikizira mphamvu ya mgwirizano ndi mphamvu yopondereza ya zinthuzo. High-quality hydroxypropyl methylcellulose HPMC, kufanana kwake ndikwabwino kwambiri, magulu ake a methoxy ndi hydroxypropoxy amagawidwa mofanana pamagulu a cellulose maselo, amatha kuonjezera mpweya pa hydroxyl ndi ether bond Kutha kwa maatomu kugwirizana ndi madzi kuti apange ma hydrogen bond. amasintha madzi aulere kukhala madzi omangika, potero amawongolera bwino kutuluka kwa madzi chifukwa cha kutentha kwambiri komanso kusunga madzi ambiri.
Chifukwa chake, pakumanga kwanyengo yachilimwe yotentha kwambiri, kuti mukwaniritse kusungirako madzi, ndikofunikira kuwonjezera zinthu zamtundu wa HPMC pamlingo wokwanira molingana ndi chilinganizo, apo ayi, padzakhala hydration osakwanira, kuchepetsedwa mphamvu, kusweka, kukumba. ndi kukhetsa chifukwa cha kuyanika kwambiri. mavuto, komanso kuonjezera zovuta zomangamanga ogwira ntchito. Pamene kutentha kumatsika, kuchuluka kwa madzi a HPMC omwe amawonjezeredwa akhoza kuchepetsedwa pang'onopang'ono, ndipo zotsatira zofanana zosungira madzi zimatha kutheka.

(3) Kusungunuka kwa hydroxypropyl methylcellulose HPMC

M'makampani omanga,hydroxypropyl methylcellulose HPMCnthawi zambiri imayikidwa m'madzi osalowerera ndale, ndipo mankhwala a HPMC amasungunuka okha kuti aweruze kuchuluka kwa kusungunuka. Pambuyo poyikidwa m'madzi osalowerera okha, mankhwala omwe amathamanga mofulumira popanda kubalalika ndi mankhwala opanda chithandizo chapamwamba; atayikidwa m'madzi osalowerera okha, mankhwala omwe amatha kumwazikana komanso osaphatikizana ndi mankhwala okhala ndi mankhwala apamwamba. Pamene pamwamba osasamalidwa hydroxypropyl methylcellulose HPMC kusungunuka yekha, tinthu ake limodzi amasungunuka mofulumira ndi kupanga filimu mwamsanga, kuchititsa madzi kuti asalowenso tinthu ting'onoting'ono, kuchititsa agglomeration ndi agglomeration, amene panopa amatchedwa pang'onopang'ono Kusungunuka mu malonda msika.

Pamwamba-ankachitira hydroxypropyl methylcellulose HPMC mankhwala particles, mu ndale madzi, particles munthu akhoza kumwazikana popanda agglomeration, koma kukhuthala mankhwala sadzatero yomweyo. Pambuyo akuwukha kwa nthawi ndithu, kapangidwe mankhwala pamwamba mankhwala awonongedwa, ndipo madzi akhoza kupasuka HPMC particles. Panthawi imeneyi, mankhwala particles akhala omwazika mokwanira ndi odzipereka madzi okwanira, kotero mankhwala sadzakhala agglomerate kapena agglomerate pambuyo kuvunda. Kuthamanga kwa kubalalitsidwa ndi liwiro la kuwonongeka kumadalira kuchuluka kwa chithandizo chapamwamba. Ngati mankhwala pamwamba ndi pang'ono, kubalalitsidwa liwiro ndi pang'onopang'ono ndi kumamatira liwiro mofulumira; pamene mankhwala okhala ndi mankhwala ozama pamwamba ali ndi liwiro lobalalika mofulumira komanso mofulumira kumamatira. Ngati mukufuna kupanga mndandanda wazinthuzi kuti zisungunuke mofulumira mu chikhalidwe ichi, mukhoza kugwetsa zinthu zochepa zamchere pamene zimasungunuka zokha. Msika wamakono nthawi zambiri umatchedwa zinthu zaposachedwa. Makhalidwe a mankhwala amtundu wa HPMC ndi awa: mu njira yamadzimadzi, tinthu tating'onoting'ono titha kumwazikana, titha kusungunuka mwachangu mumchere wamchere, ndikusungunuka pang'onopang'ono mu ndale komanso acidic.

Makhalidwe a osasamalidwa hydroxypropyl methylcellulose HPMC ndi: tinthu limodzi dissolves mofulumira kwambiri acidic, zamchere, ndi ndale limati, koma sangathe kumwazikana pakati particles mu madzi, chifukwa mu clustering ndi agglomeration . Mu ntchito yeniyeni, pambuyo kubalalitsidwa thupi la mndandanda wa mankhwala ndi particles olimba monga mphira ufa, simenti, mchenga, etc., mlingo kuvunda ndi mofulumira kwambiri, ndipo palibe agglomeration kapena agglomeration. Pamene kuli koyenera kupasuka HPMC mankhwala payokha, mndandanda wa mankhwala ayenera kugwiritsidwa ntchito mosamala, monga agglomerate ndi kugwira pamodzi. Ngati kuli kofunikira kusungunula mankhwala osagwiritsidwa ntchito pamwamba a hydroxypropyl methylcellulose HPMC padera, ayenera kumwaziridwa mofanana ndi madzi otentha a 95 ° C, ndiyeno atakhazikika kuti asungunuke.

Mu ntchito kwenikweni kupanga, mndandanda wa mankhwala nthawi zambiri kupasuka pambuyo omwazika ndi zinthu zina olimba tinthu pansi pa zinthu zamchere, ndi Kusungunuka mlingo wake si wosiyana ndi zinthu zosasamalidwa. Ndiwoyeneranso kugwiritsidwa ntchito pazinthu zomwe zimasungunuka zokha, popanda caking kapena zotupa. Chitsanzo chapadera cha mankhwalawo chikhoza kusankhidwa molingana ndi kuchuluka kwa kusungunuka komwe kumafunikira ndi zomangamanga.
Panthawi yomanga, kaya ndi matope a simenti kapena gypsum-based slurry, ambiri mwa iwo ndi machitidwe amchere, ndipo kuchuluka kwa HPMC kuwonjezeredwa ndi kochepa kwambiri, komwe kungathe kugawidwa mofanana pakati pa particles izi. Madzi akawonjezeredwa, HPMC idzasungunuka mwamsanga.