Ngokutadisha umphumela wemithamo ehlukene ye-hydroxypropyl methylcellulose (HPMC) ekuphrintekeni, izakhiwo ze-rheological kanye nezakhiwo zemishini zodaka lokunyathelisa lwe-3D, kwaxoxwa ngesilinganiso esifanele se-HPMC, futhi indlela yayo yethonya yahlaziywa kuhlanganiswe ne-microscopic morphology. Imiphumela ibonisa ukuthi uketshezi lodaka lwehla ngokunyuka kokuqukethwe kwe-HPMC, okusho ukuthi i-extrudability iyancipha ngokunyuka kokuqukethwe kwe-HPMC, kodwa ikhono lokugcinwa kwe-fluidity liyathuthuka. I-Extrudability; izinga lokugcinwa komumo kanye nokumelana nokungena ngaphansi kwesisindo somuntu siqu kukhuphuka kakhulu ngokunyuka kokuqukethwe kwe-HPMC, okungukuthi, ngokukhuphuka kokuqukethwe kwe-HPMC, ukusitika kuyathuthuka futhi isikhathi sokuphrinta sinwetshwa; ngokombono we-rheology, ngokukhuphuka kokuqukethwe kwe-HPMC, i-viscosity ebonakalayo, ukucindezeleka kwesivuno kanye ne-plastiki viscosity ye-slurry yanda kakhulu, futhi ukusimama kuthuthukisiwe; i-thixotropy yaqala yanda bese yehla ngokunyuka kokuqukethwe kwe-HPMC, futhi ukuphrinta kwaba ngcono; okuqukethwe kwe-HPMC kwanda Ukuphakama kakhulu kuzodala i-porosity yodaka kanye namandla Kunconywa ukuthi okuqukethwe kwe-HPMC akufanele kudlule u-0.20%.
Eminyakeni yamuva, ubuchwepheshe bokuphrinta be-3D (okwaziwa nangokuthi "ukukhiqiza okungeziwe") buthuthuke ngokushesha futhi busetshenziswe kabanzi emikhakheni eminingi efana ne-bioengineering, i-aerospace, nokudalwa kobuciko. Inqubo ye-mold-free yobuchwepheshe bokuphrinta be-3D iye yathuthukisa kakhulu impahla futhi Ukuguquguquka kokuklama kwesakhiwo kanye nendlela yayo yokwakha ezenzakalelayo ayigcini nje ngokusindisa kakhulu abasebenzi, kodwa futhi ifanele amaphrojekthi wokwakha ezindaweni ezihlukahlukene ezinokhahlo. Inhlanganisela yobuchwepheshe bokuphrinta be-3D kanye nenkundla yokwakha iyasha futhi iyathembisa. Njengamanje, izinto ezisekelwe kusimende ze-3D Inqubo emele yokuphrinta yinqubo yokupakisha i-extrusion (okuhlanganisa ubuciko benqubo yekhonta) kanye nenqubo yokuphrinta ukhonkolo kanye nenqubo yokuhlanganisa impushana (inqubo ye-D-shape). Phakathi kwabo, inqubo ye-extrusion stacking inezinzuzo zomehluko omncane kusukela kunqubo yokubumba ukhonkolo yendabuko, ukutholakala okuphezulu kwezingxenye zobukhulu obukhulu kanye nezindleko zokwakha. Inzuzo ephansi isiphenduke izindawo zamanje Zocwaningo zobuchwepheshe bokuphrinta be-3D bezinto ezisekelwe kusimende.
Okwezinto ezisekelwe kusimende ezisetshenziswa "njengezinto zikayinki" zokuphrinta kwe-3D, izidingo zabo zokusebenza zihlukile kulezo zezinto ezisekelwe kusimende ezijwayelekile: ngakolunye uhlangothi, kunezidingo ezithile zokusebenza kwezinto ezisanda kuxutshwa usimende, futhi inqubo yokwakha idinga ukuhlangabezana nezidingo ze-extrusion ebushelelezi. isisindo sakhe kanye nokucindezela kongqimba olungaphezulu. Ukwengeza, inqubo ye-lamination yokunyathelisa ye-3D yenza izendlalelo phakathi kwezingqimba Ukuze kuqinisekiswe izakhiwo ezinhle zemishini yendawo ye-interlayer interface, izinto zokwakha zokunyathelisa ze-3D kufanele futhi zibe nokunamathela okuhle. Kafushane, idizayini ye-extrudability, stackability, kanye nokunamathela okuphezulu kwakhiwa ngesikhathi esifanayo. Izinto ezisekelwe kusimende zingenye yezimfuneko zokusetshenziswa kobuchwepheshe bokuphrinta be-3D emkhakheni wokwakha. Ukulungisa inqubo ye-hydration kanye nezakhiwo ze-rheological zezinto ze-cementitious ziyizindlela ezimbili ezibalulekile zokuthuthukisa ukusebenza kokuphrinta okungenhla. Ukulungiswa kwenqubo ye-hydration yezinto ze-cementitious Kunzima ukuyisebenzisa, futhi kulula ukubangela izinkinga ezifana nokuvinjelwa kwamapayipi; kanye nokulawulwa kwezakhiwo ze-rheological kudinga ukugcinwa kwe-fluidity ngesikhathi senqubo yokunyathelisa kanye nesivinini sokuhlela ngemva kokubunjwa kwe-extrusion.Ocwaningweni lwamanje, ama-modifiers we-viscosity, ama-mineral admixtures, ama-nanoclays, njll avame ukusetshenziselwa ukulungisa izakhiwo ze-rheological zezinto ezisekelwe kusimende ukuze kuzuzwe ukusebenza okungcono kokunyathelisa.
IHydroxypropyl methylcellulose (HPMC) iwugqinsi ovamile we-polymer. Amabhondi e-hydroxyl ne-ether kuketango lamangqamuzana angahlanganiswa namanzi amahhala ngamabhondi e-hydrogen. Ukuyethula kukhonkolo kungathuthukisa ngempumelelo ukuhlangana kwayo. kanye nokugcinwa kwamanzi. Njengamanje, ucwaningo ngomphumela we-HPMC ezimpahleni zezinto ezisekelwe ku-cement lugxile kakhulu emthelela walo ku-fluidity, ukugcinwa kwamanzi, kanye ne-rheology, futhi ucwaningo oluncane lwenziwe mayelana nezakhiwo ze-3D zokunyathelisa izinto ezisekelwe ku-cement (ezifana nokuphuma, ukusimama, njll.). Ngaphezu kwalokho, ngenxa yokuntuleka kwezindinganiso ezifanayo zokuphrinta kwe-3D, indlela yokuhlola yokuphrinta kwezinto ezisekelwe kusimende ayikasungulwa. Ukusndeka kokubalulekile kuhlolwa ngenani lezendlalelo eziphrintekayo ezinokuwohloka okuphawulekayo noma ubude bokuphrinta obukhulu. Izindlela zokuhlola ezingenhla zingaphansi kokuzithoba okuphezulu, ukungahambi kahle kwendawo yonke, kanye nenqubo enzima. Indlela yokuhlola ukusebenza inamandla amakhulu kanye nenani ekusetshenzisweni kobunjiniyela.
Kuleli phepha, imithamo ehlukene ye-HPMC yethulwa ezintweni ezisekelwe kusimende ukuze kuthuthukiswe ukuphrinta kodaka, futhi imiphumela yomthamo we-HPMC kuzakhiwo zodaka lokunyathelisa lwe-3D yahlolwa ngokugcwele ngokutadisha ukuphrinta, izakhiwo ze-rheological kanye nezakhiwo zemishini. Ngokusekelwe ezimpahleni ezifana noketshezi Ngokusekelwe emiphumeleni yokuhlola, udaka oluxutshwe nenani eliphelele le-HPMC lakhethwa ukuze kuqinisekiswe ukuphrinta, futhi imingcele efanelekile yebhizinisi eliphrintiwe yahlolwa; ngokusekelwe ocwaningweni lwe-microscopic morphology yesampula, indlela yangaphakathi yokuguquguquka kokusebenza kwezinto zokunyathelisa yahlolisiswa. Ngaso leso sikhathi, kwasungulwa izinto ezisekelwe kusimende zokunyathelisa ze-3D. Indlela yokuhlola ebanzi yokusebenza okuphrintekayo ukuze kuthuthukiswe ukusetshenziswa kobuchwepheshe bokuphrinta be-3D emkhakheni wokwakha.
Isikhathi sokuthumela: Sep-27-2022