Los ntawm kev kawm txog cov txiaj ntsig ntawm cov tshuaj hydroxypropyl methylcellulose (HPMC) sib txawv ntawm kev luam tawm, cov khoom rheological thiab cov khoom siv kho tshuab ntawm 3D luam ntawv mortar, qhov kev siv tshuaj HPMC tsim nyog tau tham txog, thiab nws cov txheej txheem cuam tshuam tau raug tshuaj xyuas ua ke nrog cov qauv microscopic. Cov txiaj ntsig qhia tau tias qhov fluidity ntawm mortar txo qis nrog kev nce ntawm cov ntsiab lus ntawm HPMC, uas yog qhov extrudability txo qis nrog kev nce ntawm cov ntsiab lus ntawm HPMC, tab sis qhov fluidity retention peev xwm txhim kho. Extrudability; cov duab khaws cia tus nqi thiab kev tiv thaiv nkag mus rau hauv qab qhov hnyav tus kheej nce ntxiv nrog kev nce ntawm cov ntsiab lus HPMC, uas yog, nrog kev nce ntawm cov ntsiab lus HPMC, stackability txhim kho thiab lub sijhawm luam ntawv ntev; los ntawm qhov pom ntawm rheology, nrog nrog kev nce ntawm cov ntsiab lus ntawm HPMC, qhov pom tseeb viscosity, yield kev ntxhov siab thiab yas viscosity ntawm slurry nce ntxiv ntau, thiab stackability txhim kho; thixotropy thawj zaug nce thiab tom qab ntawd txo qis nrog kev nce ntawm cov ntsiab lus ntawm HPMC, thiab kev luam tawm txhim kho; Cov ntsiab lus ntawm HPMC nce siab Siab dhau yuav ua rau cov porosity ntawm cov mortar nce thiab lub zog Nws raug pom zoo tias cov ntsiab lus ntawm HPMC yuav tsum tsis pub tshaj 0.20%.
Nyob rau xyoo tas los no, 3D printing (tseem hu ua "additive manufacturing") thev naus laus zis tau tsim kho sai thiab tau siv dav hauv ntau qhov chaw xws li bioengineering, aerospace, thiab kev tsim kos duab. Cov txheej txheem tsis muaj pwm ntawm 3D printing thev naus laus zis tau txhim kho cov khoom siv thiab Kev ywj pheej ntawm kev tsim qauv thiab nws txoj kev tsim kho tsis siv neeg tsis tsuas yog txuag tau tib neeg lub zog xwb, tab sis kuj tsim nyog rau cov haujlwm tsim kho hauv ntau qhov chaw nyuaj. Kev sib xyaw ua ke ntawm 3D printing thev naus laus zis thiab thaj chaw tsim kho yog qhov tshiab thiab muaj kev cia siab. Tam sim no, cov ntaub ntawv cement-based 3D Cov txheej txheem sawv cev ntawm kev luam ntawv yog cov txheej txheem extrusion stacking (suav nrog cov txheej txheem contour contour crafting) thiab cov txheej txheem luam ntawv pob zeb thiab cov txheej txheem sib txuas hmoov (D-puab txheej txheem). Ntawm lawv, cov txheej txheem extrusion stacking muaj qhov zoo ntawm qhov sib txawv me me los ntawm cov txheej txheem molding pob zeb ib txwm muaj, qhov ua tau zoo ntawm cov khoom loj thiab cov nqi tsim kho. Qhov zoo dua qis dua tau dhau los ua qhov kev tshawb fawb tam sim no ntawm 3D printing thev naus laus zis ntawm cov ntaub ntawv cement-based.
Rau cov ntaub ntawv cement-based siv ua "cov ntaub ntawv number case" rau 3D printing, lawv cov kev cai ua haujlwm txawv ntawm cov ntaub ntawv cement-based dav dav: ntawm ib sab tes, muaj qee qhov kev cai rau kev ua haujlwm ntawm cov ntaub ntawv cement-based tshiab, thiab cov txheej txheem kev tsim kho yuav tsum ua kom tau raws li qhov yuav tsum tau ua ntawm kev extrusion du, Ntawm qhov tod tes, cov ntaub ntawv cement-based extruded yuav tsum tau stackable, uas yog, nws yuav tsis vau lossis deform tseem ceeb nyob rau hauv qhov kev ua ntawm nws tus kheej qhov hnyav thiab lub siab ntawm cov txheej sab saud. Tsis tas li ntawd, cov txheej txheem lamination ntawm 3D printing ua rau cov khaubncaws sab nraud povtseg ntawm cov khaubncaws sab nraud povtseg Txhawm rau kom ntseeg tau tias muaj cov khoom siv kho tshuab zoo ntawm thaj chaw interlayer interface, cov ntaub ntawv tsev luam ntawv 3D kuj yuav tsum muaj kev nplaum zoo. Hauv kev xaus, kev tsim qauv ntawm extrudability, stackability, thiab kev nplaum siab yog tsim tib lub sijhawm. Cov ntaub ntawv cement-based yog ib qho ntawm cov kev cai ua ntej rau kev siv cov thev naus laus zis luam ntawv 3D hauv kev tsim kho. Kev kho cov txheej txheem hydration thiab rheological cov khoom ntawm cov ntaub ntawv cementitious yog ob txoj hauv kev tseem ceeb los txhim kho kev ua tau zoo ntawm kev luam ntawv saum toj no. Kev kho cov txheej txheem hydration ntawm cov ntaub ntawv cementitious Nws nyuaj rau kev siv, thiab nws yooj yim ua rau muaj teeb meem xws li cov yeeb nkab thaiv; thiab kev tswj hwm ntawm cov khoom rheological yuav tsum tswj hwm qhov fluidity thaum lub sijhawm luam ntawv thiab qhov ceev ntawm cov qauv tom qab extrusion molding. Hauv kev tshawb fawb tam sim no, viscosity modifiers, mineral admixtures, nanoclays, thiab lwm yam feem ntau yog siv los kho cov khoom rheological ntawm cov ntaub ntawv cement-based kom ua tiav kev ua tau zoo dua.
Hydroxypropyl methylcellulose (HPMC) yog ib qho polymer thickener uas siv ntau. Cov hydroxyl thiab ether bonds ntawm cov saw molecular tuaj yeem ua ke nrog dej dawb los ntawm hydrogen bonds. Kev qhia nws rau hauv cov pob zeb ua vaj tse tuaj yeem txhim kho nws cov cohesion thiab kev khaws cia dej. Tam sim no, kev tshawb fawb txog qhov cuam tshuam ntawm HPMC rau cov khoom ntawm cov khoom siv cement feem ntau yog tsom mus rau nws cov nyhuv rau fluidity, water retention, thiab rheology, thiab me ntsis kev tshawb fawb tau ua tiav ntawm cov khoom ntawm 3D printing cement-based cov khoom siv (xws li extrudability, stackability, thiab lwm yam). Tsis tas li ntawd, vim tsis muaj cov qauv sib xws rau 3D printing, txoj kev ntsuam xyuas rau kev luam tawm ntawm cov khoom siv cement-based tseem tsis tau tsim. Qhov stackability ntawm cov khoom siv raug soj ntsuam los ntawm tus lej ntawm cov khaubncaws sab nraud povtseg luam tawm nrog kev hloov pauv tseem ceeb lossis qhov siab tshaj plaws ntawm kev luam tawm. Cov txheej txheem ntsuam xyuas saum toj no yog raug rau kev xav tau siab, tsis muaj kev sib txawv, thiab cov txheej txheem cumbersome. Txoj kev ntsuam xyuas kev ua tau zoo muaj peev xwm zoo thiab muaj nqis hauv kev siv engineering.
Hauv tsab ntawv no, ntau yam tshuaj HPMC tau muab tso rau hauv cov ntaub ntawv cement-based los txhim kho qhov luam tawm ntawm cov mortar, thiab cov teebmeem ntawm HPMC koob tshuaj rau 3D luam ntawv mortar cov khoom tau soj ntsuam tag nrho los ntawm kev kawm txog kev luam tawm, rheological cov khoom thiab cov khoom siv kho tshuab. Raws li cov khoom xws li fluidity Raws li cov txiaj ntsig kev ntsuam xyuas, cov mortar sib xyaw nrog qhov zoo tshaj plaws ntawm HPMC tau xaiv rau kev txheeb xyuas kev luam ntawv, thiab cov kev cai cuam tshuam ntawm cov khoom luam tawm tau sim; raws li kev kawm ntawm cov qauv me me ntawm cov qauv, lub tshuab sab hauv ntawm kev hloov pauv kev ua tau zoo ntawm cov ntaub ntawv luam ntawv tau tshawb nrhiav. Tib lub sijhawm, cov ntaub ntawv cement-based luam ntawv 3D tau tsim. Ib txoj kev ntsuam xyuas tag nrho ntawm kev ua tau zoo luam tawm kom txhawb kev siv cov thev naus laus zis luam ntawv 3D hauv kev tsim kho.
Lub sijhawm tshaj tawm: Cuaj hlis-27-2022