1. Chidule cha HPMC
Hydroxypropyl methylcellulose (HPMC mwachidule) ndi zinthu zomwe zimagwiritsidwa ntchito polima zachilengedwe, zomwe zimagwiritsidwa ntchito pomanga, zokutira, mankhwala, chakudya ndi zina. HPMC imapezeka ndi kusintha kwa mankhwala a cellulose, imakhala ndi kusungunuka kwa madzi ndi biocompatibility, ndipo imasungunuka mu zosungunulira za organic. Chifukwa cha kusungunuka kwake bwino kwamadzi, kumamatira, kukhuthala, kuyimitsidwa ndi zinthu zina, HPMC yakhala ikugwiritsidwa ntchito kwambiri pantchito yomanga, makamaka pakugwiritsa ntchito ufa wa putty.
2. Udindo wa HPMC mu putty powder
Putty ufa ndi zida zomangira zomwe zimagwiritsidwa ntchito pochiza khoma, ndipo zigawo zake zazikulu ndi zodzaza ndi zomangira. HPMC, monga thickener wamba ndi wothandizira madzi, akhoza bwino kusintha ntchito putty ufa, makamaka kuphatikizapo zotsatirazi:
Thickening zotsatira: HPMC imapanga njira colloidal pambuyo Kutha mu madzi, amene ali amphamvu thickening tingati akhoza kusintha rheological zimatha putty ufa, kukhala ndi mamasukidwe akayendedwe oyenera, kupewa kukhala woonda kwambiri pamene ntchito, ndi kusintha chitonthozo ntchito.
Limbikitsani ntchito yomanga: Kukhuthala kwa HPMC sikungopangitsa kuti ufa wa putty ukhale wocheperako kapena kudontha panthawi yofunsira, komanso kumathandizira kumamatira kwa ufa wa putty, kupangitsa kuti ikhale yosavuta kugwiritsa ntchito pakhoma, potero kumapangitsa kuti ntchito yomanga ikhale yabwino.
Limbikitsani kusungirako madzi: HPMC imatha kusunga madzi mu putty powder ndikuchepetsa kuthamanga kwa madzi. Izi zitha kuteteza pamwamba pa putty ufa kuti usawume mwachangu, kuonetsetsa kuti ikugwira ntchito pakumanga, ndikupewa ming'alu ndi kukhetsa.
Limbikitsani kukhudza ndi kusalala kwa pamwamba: HPMC sikungowonjezera ductility ya putty powder, komanso kumapangitsanso kuti pamwamba pake ikhale yosalala, kupangitsa kuti putty layer ikhale yosalala, yomwe imathandizira kupenta kwapambuyo pake. Panthawi yomanga, HPMC ikhoza kupereka kusalala bwino komanso kuchepetsa kubadwa kwa zolakwika ndi thovu.
Kupititsa patsogolo kukhazikika kwa zomangamanga: Kuwonjezera kwa HPMC kumatha kupititsa patsogolo kutentha kwa mpweya wa putty powder, kuteteza kuyika kwa tinthu tating'onoting'ono mmenemo, ndikuonetsetsa kuti ubwino ndi ntchito ya putty powder sichidzasintha kwambiri panthawi yosungiramo nthawi yaitali.
Limbikitsani kukana kwa ming'alu: Kupyolera mu kusungirako madzi ndi kukhuthala kwa HPMC, kukana kwa ufa wa putty kumatha kuwongolera, ming'alu pakhoma imatha kupewedwa, ndipo moyo wautumiki ukhoza kukulitsidwa.
3. Kukhuthala koyenera kwa HPMC
Zotsatira za HPMC mu putty powder zimagwirizana kwambiri ndi kukhuthala kwake. Kusankhidwa kwa viscosity kuyenera kutsimikiziridwa molingana ndi zofunikira zenizeni za putty powder ndi malo omanga. Nthawi zambiri, kukhuthala kwa HPMC kumayambira mazana mpaka makumi masauzande a millipoise (mPa · s), pomwe ma viscosity osiyanasiyana ndi oyenera mitundu yosiyanasiyana ya ufa wa putty ndi zofunikira zomanga.
Low mamasukidwe akayendedwe HPMC (pafupifupi 1000-3000 mPa · s): oyenera opepuka putty ufa kapena base putty, makamaka ntchito pamene kuchulukitsidwa kwamadzimadzi kumafunika. Low mamachulukidwe akayendedwe HPMC angapereke ❖ kuyanika ntchito bwino, kupanga putty ufa kukhala zosavuta ntchito, koma kusunga madzi ndi kukana ming'alu ndizofooka.
Kukhuthala kwapakatikati HPMC (pafupifupi 3000-8000 mPa · s): yoyenera pamitundu yodziwika bwino ya ufa wa putty, yomwe ingapereke kusungirako madzi abwino komanso anti-mvula pomwe ikusunga madzi abwino. HPMC ya mamasukidwe akayendedwe izi sizingakhoze kokha kukwaniritsa zofunika ❖ kuyanika pomanga, komanso mogwira kuteteza mavuto monga akulimbana ndi kugwa.
High mamasukidwe akayendedwe HPMC (za 8000-20000 mPa·s): oyenera zigawo wandiweyani wa putty ufa kapena zochitika amafuna thickening kwambiri. High mamasukidwe akayendedwe HPMC angapereke bwino wandiweyani ❖ kuyanika ntchito ndi kukhazikika, ndipo ndi oyenera ❖ kuyanika ntchito zimene zimafuna kukhudza mwamphamvu ndi kusalala, koma tisaiwale kuti kukhuthala kwakukulu kungachititse putty ufa kukhala viscous kwambiri ndi kukhudza ntchito yomanga.
Muzogwiritsira ntchito, kukhuthala koyenera kwa HPMC kumayenera kusankhidwa molingana ndi momwe amagwiritsidwira ntchito komanso njira yomanga ya putty powder. Mwachitsanzo, khoma la khoma likamakhala lovuta kwambiri kapena zomangamanga zingapo zimafunikira, HPMC imatha kusankhidwa kuti ipititse patsogolo kumamatira ndi kukana kwa zokutira; pomwe nthawi zomwe zimafuna kuchuluka kwamadzimadzi komanso kumanga mwachangu, HPMC yotsika mpaka yapakatikati imatha kusankhidwa.
Hydroxypropyl methylcellulosendizowonjezera zomanga zomwe zimatha kupititsa patsogolo ntchito yomanga, kusunga madzi, kumamatira komanso kukana kwa ufa wa putty. Kusankha mamasukidwe oyenera a HPMC ndikofunikira pakugwiritsa ntchito ufa wa putty. Ma viscosity osiyanasiyana amatha kusinthidwa molingana ndi mtundu wa ufa wa putty, malo omanga, komanso zofunikira pakuchita. Pakupanga ndi kumanga kwenikweni, kuyang'anira mamasukidwe akayendedwe a HPMC kumatha kukwaniritsa zomanga zabwino komanso magwiridwe antchito anthawi yayitali. Choncho, molingana ndi zofunikira zosiyanasiyana zomanga, kusankha moyenera ndikusintha kukhuthala kwa HPMC ndi sitepe yofunikira kuti muwonetsetse kuti ntchito ndi ubwino wa putty powder.
Nthawi yotumiza: Mar-25-2025