Pophunzira momwe milingo yosiyanasiyana ya hydroxypropyl methylcellulose (HPMC) imasindikizidwa, rheological properties ndi makina a matope osindikizira a 3D, mlingo woyenera wa HPMC unakambidwa, ndipo mphamvu yake inafufuzidwa pamodzi ndi morphology ya microscopic.Zotsatira zimasonyeza kuti fluidity ya matope amachepetsa ndi kuwonjezeka zili HPMC, ndiko extrudability amachepetsa ndi kuwonjezeka zili HPMC, koma fluidity posungira mphamvu bwino.Extrudability;mawonekedwe osungira mawonekedwe ndi kukana kulowa pansi pa kudzilemera kumawonjezeka kwambiri ndi kuwonjezeka kwa HPMC zili, ndiko kuti, ndi kuwonjezeka kwa HPMC okhutira, stackability bwino ndi kusindikiza nthawi yaitali;kuchokera kumalingaliro a rheology, ndi kuchuluka kwa zomwe zili mu HPMC, mawonekedwe owoneka bwino, kupsinjika kwa zokolola ndi kukhuthala kwa pulasitiki kwa slurry kunakula kwambiri, ndikukhazikika bwino;thixotropy choyamba chinawonjezeka ndiyeno chinachepa ndi kuwonjezeka kwa zomwe zili mu HPMC, ndipo kusindikizidwa kunakula;Zomwe zili mu HPMC zawonjezeka Kwambiri zidzachititsa kuti matope a porosity achuluke komanso mphamvu Ndi bwino kuti zomwe zili mu HPMC zisapitirire 0.20%.
M'zaka zaposachedwa, ukadaulo wosindikiza wa 3D (womwe umadziwikanso kuti "zowonjezera zopanga") wakula mwachangu ndipo wakhala ukugwiritsidwa ntchito kwambiri m'magawo ambiri monga bioengineering, aerospace, ndi luso laukadaulo.Njira yopanda nkhungu yaukadaulo yosindikizira ya 3D yasintha kwambiri zinthu komanso Kusinthasintha kwa mapangidwe apangidwe ndi njira yake yomangira yokhayo sikungopulumutsa anthu ogwira ntchito, komanso ndikoyenera pantchito yomanga m'malo ovuta osiyanasiyana.Kuphatikiza kwaukadaulo wosindikizira wa 3D ndi gawo la zomangamanga ndizatsopano komanso zopatsa chiyembekezo.Pakalipano, zipangizo zopangira simenti 3D Njira yoyimira yosindikizira ndi njira yopangira ma extrusion (kuphatikizapo ndondomeko ya contour crafting) ndi kusindikiza konkire ndi ndondomeko ya ufa (D-mawonekedwe ndondomeko).Pakati pawo, extrusion stacking ndondomeko ali ubwino kusiyana pang'ono ndi ndondomeko akamaumba konkire chikhalidwe, kuthekera mkulu wa zigawo zikuluzikulu kukula ndi ndalama yomanga.Ubwino wocheperako wasanduka malo apano a Kafukufuku waukadaulo wosindikiza wa 3D wa zida zopangira simenti.
Pazinthu zopangira simenti zomwe zimagwiritsidwa ntchito ngati "zida za inki" zosindikizira za 3D, zofunikira zawo zimasiyana ndi zida za simenti wamba: mbali imodzi, pali zofunikira zina pakugwirira ntchito kwa zida zosakanikirana zatsopano za simenti, ndi Ntchito yomangayi iyenera kukwaniritsa zofunikira za extrusion yosalala, Komano, zinthu zopangira simenti zowonjezera ziyenera kukhala stackable, ndiko kuti, sizidzagwa kapena kupunduka kwambiri pansi pa kulemera kwake ndi kukakamizidwa kwa wosanjikiza wapamwamba.Kuonjezera apo, njira yosindikizira ya 3D yosindikizira imapanga zigawo pakati pa zigawo Pofuna kuonetsetsa kuti makina abwino a malo opangira interlayer, zipangizo zomangira zosindikizira za 3D ziyeneranso kukhala ndi zomatira zabwino.Mwachidule, mapangidwe a extrudability, stackability, ndi adhesion mkulu amapangidwa nthawi yomweyo.Zida zopangira simenti ndi chimodzi mwazofunikira kuti mugwiritse ntchito ukadaulo wosindikiza wa 3D pantchito yomanga.Kusintha ndondomeko ya hydration ndi rheological katundu wa cementitious zipangizo ndi njira ziwiri zofunika kusintha ntchito yosindikiza pamwamba.Kusintha kwa njira ya hydration ya zida za simenti Ndizovuta kukhazikitsa, ndipo ndizosavuta kuyambitsa mavuto monga kutsekeka kwa chitoliro;ndi lamulo la rheological katundu ayenera kusunga fluidity pa ndondomeko yosindikiza ndi liwiro structuring pambuyo akamaumba extrusion.Mu kafukufuku panopa, mamasukidwe akayendedwe modifiers, mchere admixtures, nanoclays, etc. nthawi zambiri ntchito kusintha rheological katundu wa simenti ofotokoza. zipangizo kukwaniritsa bwino kusindikiza ntchito.
Hydroxypropyl methylcellulose (HPMC) ndi polymer thickener wamba.Zomangira za hydroxyl ndi ether pa tcheni cha molekyulu zitha kuphatikizidwa ndi madzi aulere kudzera mu ma hydrogen bond.Kuyiyika mu konkire kumatha kupititsa patsogolo mgwirizano wake.ndi kusunga madzi.Pakalipano, kafukufuku wokhudza zotsatira za HPMC pa katundu wa simenti yopangidwa ndi simenti amayang'ana kwambiri momwe zimakhudzira fluidity, kusunga madzi, ndi rheology, ndipo kafukufuku wochepa wapangidwa pazinthu za 3D zosindikizira zopangira simenti ( monga extrudability, stackability, etc.).Kuonjezera apo, chifukwa cha kusowa kwa miyezo yofanana ya kusindikiza kwa 3D, njira yowunikira kusindikizidwa kwa zinthu zopangidwa ndi simenti sizinakhazikitsidwe.Kukhazikika kwazinthuzo kumawunikidwa ndi kuchuluka kwa zigawo zosindikizidwa zokhala ndi mapindikidwe ofunikira kapena kutalika kosindikiza kokwanira.Njira zowunikira zomwe zili pamwambazi zimadalira kudalira kwambiri, kusakhala bwino padziko lonse lapansi, komanso njira zovuta.Njira yowunikira ntchito ili ndi kuthekera kwakukulu komanso phindu pakugwiritsa ntchito uinjiniya.
Mu pepalali, milingo yosiyanasiyana ya HPMC idayambitsidwa muzinthu zopangidwa ndi simenti kuti zithandizire kusindikiza kwa matope, ndipo zotsatira za mlingo wa HPMC pamitengo yamatope osindikizira a 3D adawunikidwa mozama pophunzira kusindikiza, ma rheological properties ndi makina amakina.Kutengera zinthu monga fluidity Kutengera zotsatira zowunika, matope osakanikirana ndi kuchuluka kwabwino kwa HPMC adasankhidwa kuti atsimikizire kusindikiza, ndipo magawo ofunikira a bungwe losindikizidwa adayesedwa;potengera kafukufuku wa kachitidwe kakang'ono kakang'ono kachitsanzo, njira yamkati yakusintha kwazinthu zosindikizira idafufuzidwa.Nthawi yomweyo, zida za simenti zosindikizira za 3D zidakhazikitsidwa.Njira yowunikira mwatsatanetsatane ya magwiridwe antchito osindikizidwa kuti alimbikitse kugwiritsa ntchito ukadaulo wosindikiza wa 3D pantchito yomanga.
Nthawi yotumiza: Sep-27-2022