Kutengera mtundu wa hydroxypropyl methylcellulose

Tsopano popeza pali misika yochulukirachulukira ya cellulose ya hydroxypropyl carboxymethyl ndipo mitengo ndi yosagwirizana, momwe mungadziwire mosavuta komanso mwachangu mtundu wa hydroxypropyl carboxymethyl cellulose yakhala nkhani yofunika kwambiri! Ndiye mungaweruze bwanji mtundu wa hydroxypropyl methylcellulose? Chinthu choyamba kuyang'ana ndi kuyera kwa hydroxypropyl cellulose; ngakhale kuyera sikungadziwe ngati HPMC ndi yoyenera kugwiritsidwa ntchito, opanga ena osakhulupirika adzawonjezera chothandizira choyera panthawi yokonza, chomwe chidzakhudza khalidwe lake. Koma nthawi zambiri, ma ether abwino kwambiri a cellulose amakhala ndi zoyera bwino.

Kachiwiri, zimatengera fineness wa hydroxypropyl methylcellulose: tinthu kukula kwa hydroxypropyl carboxymethyl mapadi ndi 80-100 mauna, zosakwana 120 mauna, ndi hydroxyethyl mapadi HECHPMC ndi za 100 mauna. Ambiri a hpmc ndi 60-80 mauna. Nthawi zambiri, kufewa kwa methyl cellulose, kubalalitsidwa kwabwinoko.

Kumveka kwa cellulose ether mu yankho: ikani HPMC m'madzi kuti mupange njira yowonekera ya colloidal, kumveka bwino, kumveka bwino, kutsika kwa zinthu zosasungunuka.

Chogulitsacho chikatenthedwa, chimasungunuka kapena kusungunuka. Ndi hydrophobic komanso sungunuka. Konkire ndiye chinsinsi chomangirira ndikuchotsa zopangira za ufa wosamva madzi. Mfundo ya kukana madzi ndi motere: pamene redispersible latex ufa ndi simenti wothira madzi, latex ufa adzapitiriza kubwerera ku original emulsion mawonekedwe, ndi latex particles Imwazikana wogawana mu slurry simenti. Simenti ikakumana ndi madzi, hydration reaction imayamba, ndipo yankho la Ca (OH) 2 limafika pakuchulukira ndipo makhiristo amawomberedwa. Pa nthawi yomweyo, makhiristo ettringite ndi kashiamu silicate hydrate colloids amapangidwa, ndi lalabala particles waikamo pa gel osakaniza ndi unhydrated simenti particles, monga hydration zimachitikira, ndi hydration mankhwala akupitiriza kuwonjezeka, ndi lalabala particles pang'onopang'ono kusonkhanitsa mu voids wa zinthu zopanda organic monga simenti pamwamba, ndi odzaza mawonekedwe a dense gel osakaniza pamwamba. , chifukwa cha kuchepa kwapang'onopang'ono kwa chinyontho chowuma, tinthu tating'ono ta latex timene timadzaza mu gel osakaniza ndi voids coagulate kupanga filimu yosalekeza, kupanga osakaniza ndi interpenetrating masanjidwewo a simenti phala, ndi kupanga simenti phala ndi ufa zina The aggregates ndi glued wina ndi mzake.