Kuweruza ubwino wa hydroxypropyl methylcellulose

Tsopano popeza misika yambiri ya hydroxypropyl carboxymethyl cellulose ikuchulukirachulukira ndipo mitengo yake si yofanana, momwe mungadziwire mosavuta komanso mwachangu mtundu wa hydroxypropyl carboxymethyl cellulose yakhala nkhani yofunika kwambiri! Ndiye mungaweruze bwanji mtundu wa hydroxypropyl methylcellulose? Choyamba choti muwone ndi kuyera kwa hydroxypropyl cellulose; ngakhale kuyera sikungadziwike ngati HPMC ndi yoyenera kugwiritsidwa ntchito, opanga ena osakhulupirika amawonjezera choyeretsera panthawi yokonza, zomwe zidzakhudza ubwino wake. Koma nthawi zambiri, ma ether ambiri abwino kwambiri a cellulose ali ndi kuyera bwino.

Kachiwiri, zimatengera kusalala kwa hydroxypropyl methylcellulose: kukula kwa tinthu ta hydroxypropyl carboxymethyl cellulose ndi 80-100 mesh, osakwana 120 mesh, ndipo hydroxyethyl cellulose HECHPMC ndi pafupifupi 100 mesh. Hpmc yambiri ndi 60-80 mesh. Kawirikawiri, methyl cellulose ikakhala yofewa, kufalikira kwake kumakhala bwino.

Kumveka bwino kwa etha ya cellulose mu yankho: ikani HPMC m'madzi kuti ipange yankho lowonekera la colloidal, kumveka bwino kwambiri, kumveka bwino kwambiri, komanso zinthu zosasungunuka zimachepa.

Zinthu zikatenthedwa, zimasungunuka ndi madzi kenako zimasungunuka. Sizimalowa m'madzi ndipo zimasungunuka. Konkire ndiye chinthu chofunikira kwambiri chomangirira ndi kuchotsa zinthu zopangira ufa wa putty wosalowa m'madzi. Mfundo yolimbana ndi madzi ndi iyi: pamene ufa wa latex ndi simenti zomwe zimasungunukanso zikasakanizidwa ndi madzi, ufa wa latex umabwereranso ku mawonekedwe ake oyambirira a emulsion, ndipo tinthu ta latex timafalikira mofanana mu simenti. Simenti ikakumana ndi madzi, kuyamwa kwa madzi kumayamba, ndipo yankho la Ca(OH)2 limafika pa saturation ndipo makhiristo amasungunuka. Nthawi yomweyo, makhiristo a ettringite ndi calcium silicate hydrate colloids zimapangidwa, ndipo tinthu ta latex timayikidwa pa On the gel ndi tinthu ta simenti tosalowa madzi, pamene kuyamwa kwa madzi kumapitirira, zinthu zamadzimadzi zimapitirira kuwonjezeka, ndipo tinthu ta latex timasonkhana pang'onopang'ono m'malo opanda zinthu zachilengedwe monga simenti, ndikupanga wosanjikiza wodzaza pamwamba pa simenti ya gel. , chifukwa cha kuchepa pang'onopang'ono kwa chinyezi chouma, tinthu ta latex tomwe timafalikira kwambiri mu gel ndi voids timalumikizana kuti tipange filimu yopitilira, ndikupanga chisakanizo ndi matrix yolumikizirana ya phala la simenti, ndikupanga phala la simenti ndi ufa wina. Ma aggregates amamatiridwa pamodzi.