CN115279712A - 3d打印工艺和用木质素磺酸盐通过该工艺生产的模塑件 - Google Patents
3d打印工艺和用木质素磺酸盐通过该工艺生产的模塑件 Download PDFInfo
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Abstract
本发明涉及用于3D打印的材料系统,使用含木质素成分或其衍生物或改性木质素的3D打印工艺,通过基于粉末的增材层制造工艺生产的可溶性模塑件以及模塑件的用途。
Description
技术领域
本发明涉及用于3D打印的材料系统、使用含木质素成分或其衍生物的3D打印工艺、通过基于粉末的增材层制造工艺生产的可溶性模塑件以及模塑件的用途。
背景技术
欧洲专利EP 0 431 924B1描述了一种基于计算机数据生产三维物体的方法。在该方法中,在平台上沉积一薄层颗粒材料,并通过打印头在其上选择性地打印液体。在用液体打印的区域,颗粒被粘合,该区域在液体的影响下固化,如有必要,还可使用额外的硬化剂。接下来,将平台在成型缸中降低一层厚度,并提供一层新的颗粒材料,后者也如上所述进行打印。重复这些步骤,直到物体达到一定的期望高度。因此,打印和固化后的区域形成三维物体。
这种方法允许加工不同的颗粒材料,包括天然生物原材料、聚合塑料材料、金属、陶瓷和沙子,这是一个非详尽的例子。
例如,砂粒可以通过基于粉末的3D打印使用粘合剂系统进行处理。其中包括冷树脂粘合剂,其用于铸造用途以及3D打印。
无机粘合剂也用于该领域。在铸造行业,它们是冷树脂粘合剂的环保替代品。
这些材料特别适用于金属铸造,在这种情况下,高温通常占主导地位,有机粘合剂会在很大程度上燃烧,并预先削弱模具。在随后的步骤中,熔体冷却后,用机械方法去除模具残留物。对于无机粘合的模具,必须使用高能量(增强),以防止在铸造过程中模具强度下降。
对于使用合成树脂或液态凝固系统(如混凝土)进行的冷铸,上述模具均不会受到削弱。在冷铸造之前,必须对砂型表面进行涂覆和密封,并且必须使用脱模剂,以便在浇铸材料固化后分离界面。
虽然外部模具仍然可以从模具中移除,但不利的是不可能做出带有镶件型芯的铸件内部结构,因为机械移除镶件型芯而不损坏最终模具实际上是不可能的。
当使用打印砂模作为层压模具时,这种情况同样不利。简单的表面结构可以很容易地在涂层表面上产生,但这对于倒扣或悬空部分是不可能的。虽然某些几何形状可以通过机械破坏层压模具而取出层压件,但在几乎封闭的结构中,这是不可能的,并且会损坏层压件。
因此,迄今为止,还没有或只有不太令人满意的工艺能够生产出复杂的层压模塑件。然而,对于具有复杂几何形状(如倒扣)的层压成型和冷铸模具,令人满意的3D打印工艺和材料系统并不可用。
因此,本发明的目的是消除或至少大幅减少现有技术的缺点。
发明内容
本发明的目的是提供一种减少或完全避免现有技术缺点的材料系统和/或3D打印工艺。
本发明的目的是提供一种材料系统和/或3D打印工艺,其允许以简单且经济高效的方式生产复杂的几何形状和层压件。
本发明简要概述
在一个方面,本发明涉及一种包含颗粒材料或混合物和打印液体的材料系统。
在另一方面,本发明涉及一种生产模塑件的方法,该模塑件可用作层压模具或冷铸模具,并且在必要时可通过用水溶液或液体清洗来容易地去除。
本发明的详细说明
在冷铸造和层压制品生产中,本发明基本目标的解决方案是一种用于生产3D打印模塑件的材料系统和/或工艺,其中木质素或其衍生物包含在打印液中,该模塑件最好可以借助溶剂(如水)进行破坏脱模。
一方面,一种解决方案由一适用于3D打印工艺的材料系统提供;或由一3D打印工艺材料系统提供,该材料系统包括或由颗粒材料和打印液组成,其中所述颗粒材料选自无机颗粒材料,例如石英砂、橄榄石砂、角闪石(红柱石)、陶粒、陶瓷、金属粉末或其他有机颗粒材料,例如木粉、淀粉或纤维素粉,颗粒材料优选未经处理,其中打印液包括或含有选自水或水溶液及含木质素成分或其衍生物的液体,优选木质素磺酸盐。
根据本发明的材料系统的优点之一是其成本效益高,因为可以使用任一种廉价的不溶性材料,或/且不溶性颗粒材料可以大量重复使用。这对于昂贵的颗粒材料尤其有利。此外,木质素是一种可再生的原材料,容易获得,而且价格低廉。
此外,打印液体易于处理,环境兼容,对打印头及其部件温和,这在3D打印机器及其工艺中是一个重要的成本因素。
在根据本发明的材料系统中,打印液可另外包括或包含选自水溶性塑料(例如聚乙烯吡咯烷酮、聚乙二醇、聚乙烯醇或聚丙烯酸)组的组分,或与其他材料组分相容的其他已知水溶性组分。
在根据本发明的材料系统中,以这样一种方式调整各个组分之间的比率,使得可以有利地执行3D打印过程,并达到所生产的模塑件的期望特性。
在根据本发明的材料系统的一个方面,打印液被同等地调整并适应于其他材料组分,其中打印液可由极性有机或/和无机流体组成或包含极性有机或/和无机流体,优选水和/或醇。
在另一方面,根据本发明的材料系统的特征在于,打印液由极性有机或/和无机液体组成,或包含极性有机或/和无机液体,优选水和/或醇。
优选地,所述材料系统的特征在于,其另外含有可溶性淀粉水解物,例如麦芽糊精、葡萄糖,优选地,其中所述淀粉水解物的葡萄糖当量在1-50之间,优选在3-35之间,尤其优选在3-20之间。
在另一个方面,材料系统的组成部分可以在各自的比例上进行不同的调整。根据本发明的打印液中的木质素含量可在10%-35%(始终基于总混合物)、优选10%-25%、更优选15%-20%之间;淀粉水解产物可单独存在或以10%-35%(始终基于总混合物)、优选10%-25%、更优选15%-20%的比例存在于若干组分的混合物中;分散剂或/和表面活性剂可存在于0-3%之间(始终基于总混合物),优选0.1%-1%。
在根据本发明的材料系统中,醇含量可在0.5%-15%、优选2%-10%、尤其优选5%-8%之间和/或其中的醇包含简单醇、二元醇或多元醇或前述醇的混合物。
在根据本发明的材料系统中,使用本领域技术人员已知的合适物质或液体,以合适的方式调整打印液的粘度。粘度可以在2mPas-20mPas之间,优选在8mPas-15mPas之间,尤其优选在10mPas-14mPas之间。
在根据本发明的材料系统中,打印液可进一步包含表面活性剂,例如十二烷基硫酸钠或Surfynol 465,且表面张力为20mN/m-50mN/m,优选25mN/m-40mN/m,尤其优选28mN/m-35mN/m,或/和来自例如硅氧烷或/和染料组的消泡剂。
在另一方面,本发明涉及一种用于生产模塑件的3D打印工艺,所述工艺包括将颗粒材料混合物铺设到构建平面上、选择性涂覆打印液,其中,所述打印液包括或由从水或水溶液和含木质素成分或其衍生物组成的组中选择的液体组成,优选木质素磺酸盐,对于至少部分选择性固化,有选择地对构建场进行加温或将能量引入所应用的颗粒材料混合物,优选加温至30℃-60℃,更优选40℃-50℃,并对打印液进行加温,重复这些步骤直到获得所需模塑件。
这一工艺的优点是,可以生产出高质量的模塑件,并可用于各种应用和用途。
特别是,一个优点是,以这种方式生产的模塑件(也包括模具或铸造模具)可以用作层压模具,或用于在使用过程结束时再次移除模具的所有用途。这可以简单地通过加水来完成,水会冲掉模具,让用模具制作的产品轻轻地从模具中释放出来。
在根据本发明的3D打印工艺中,所获得的模塑件可与非固化颗粒材料混合物分离,并且所述模塑件优选地可经受进一步的热处理步骤。
与所有常见的3D打印工艺(例如喷墨工艺)一样,颗粒材料混合物通过重涂的方式施加,如有必要,颗粒材料混合物在应用前混合。
与所有常见的3D打印过程(例如喷墨打印过程)一样,打印液体选择性地施加于打印头上。
在根据本发明的3D打印工艺中,打印工艺完成后,可在环境条件下将模塑件留在粉末床中4h-24h,优选8h-15h,尤其优选10h-11h。
根据本发明的3D打印过程可以遵循进一步的程序。例如,在附加步骤中,对模塑件进行热处理,优选将模塑件在30℃-160℃下存放1h-7h、最好是50℃-140℃下存放4h-6h。
在根据本发明的3D打印过程中,可以通过打印和未打印的构建体积中吸入空气,以增加拆封强度。优选在模具生产完成(工作结束)后0.5h至8h内开始抽吸,最好在1h至5h内开始抽吸,尤其最好在建造过程完成后1h至3h内开始抽吸。吸入空气的温度可能与室温不同,吸入空气的温度优选为10℃-80℃,最好为15℃-60℃,尤其优选20℃-40℃。抽吸时间优选为0.5h-3h,尤其优选1h-2h。可随后额外用烘箱对零件加热,以进一步提高强度。优选地,在30℃-160℃条件下,将模塑件存放1h-7h,最好是50℃-140℃条件下存放4h-6h。除了在烘箱中进行热处理之外,还可以使用微波辐射进行后处理,或者作为热处理的替代,在2min-30min、优选2min-15min、尤其优选2min-10min的时间内进行后处理。
根据本发明的3D打印工艺中的后续步骤的另一种可能性是进一步涂覆或密封模塑件的表面,在这种情况下,本领域技术人员已知的所有工艺和材料可用于此类模塑件。
通过本发明3D打印工艺生产的模塑件可广泛应用,例如用于航空航天或类似用途的管道或软管生产的层压工艺中。
根据本发明的3D工艺生产的模塑件的材料特性是有利的,并且可以通过该工艺的适当后续步骤进一步影响某些材料特性。例如,一方面,强度可受打印液中的水溶性组分的量和施加于颗粒材料的打印液的量的影响,另一方面,强度可通过将模塑件留在粉末床中或通过后续热处理以及通过抽吸允许空气通过来调整。在环境条件下,在粉末床中再放置4h-24h、优选8h-15h、尤其优选10h-11h的模塑件在打印方向上可显示80N/cm2-150 N/cm2的强度。由于空气通过吸力通过,所述强度在较短时间后达到。在30℃-160℃、优选50℃-140℃条件下热处理1h-7h、最好4h-6h后,强度可能超过200N/cm2。
在另一方面,本发明涉及根据本发明生产的模塑件或根据本发明的工艺生产的模塑件用于合成树脂的冷铸或液态凝固系统,或用作层压模具。
下面将描述本发明的其他方面。
在根据本发明的实际3D打印工艺之前,惰性颗粒材料,例如已知用于基于粉末床的3D打印的砂,如石英砂、橄榄石砂、角闪石或陶粒,还有不可溶塑料,无需与其他可溶性有机物混合。
上述颗粒材料的优点是不需要改变现有的铺粉器技术,可以使用标准3D打印机,能够处理呋喃树脂、酚醛树脂和无机工艺中的颗粒材料。
在颗粒材料混合物的情况下,颗粒尺寸优选在90μm-250μm之间,尽管更细的粉末也适用。这在很大程度上防止了颗粒材料运输过程中的离析。
混合粉末通常已在不连续混合器中的工艺上游均匀化。
液体第二组分,即打印液体,通过打印头引入。打印液被打印头以弯曲方式引导在涂覆的第一组分上,选择性地根据预先输入的,与颗粒材料重量相关的,各层图案的数据。
打印液(液体成分)主要由溶剂(溶剂)组成,溶剂将可溶物质转移到颗粒物质上。优选地,溶剂为水。
为了确保以压力稳定的方式处理水,一方面,通过添加表面活性剂将表面张力从约72mN/m降低到优选40mN/m以下,尤其优选30mN/m-35mN/m之间。为此,仅添加少量表面活性剂,因为大量添加会促进泡沫形成,并可能导致打印过程中喷嘴故障。因此,仅向打印液中添加1%的表面活性剂,例如十二烷基硫酸钠、糖基表面活性剂、 或
通过添加易溶于水的醇,将打印液的粘度调节到4mPas-20mPas的范围。优选地,使用多元醇,例如乙二醇、丙二醇、聚乙二醇、聚乙烯醇或可溶性糖,其含量高达20%。特别优选地,以15%-20%的量添加麦芽糊精,从而产生11mPa-15mPa的粘度。
打印一层后,构建平台相对于打印单元移动一层厚度,并铺设新的粉末材料。
在这种情况下,红外线灯位于铺粉器轴和/或具有单独的轴和/或安装在打印头轴上,可以通过在打印和/或新铺设的层上经过一次或几次来加热打印和/或新铺设的层。温度升高有助于通过蒸发再次减少液体量。除了增加零件的强度外,加热步骤还有利地产生更高的轮廓清晰度,因为上述过程减少了粘合剂的扩散。
过程中的表面温度在30℃-60℃之间,最好是40℃-50℃
建造过程完成后,再铺设3mm-30mm(最好是10mm)的空层,将最后建造的零件完全嵌入松散材料中。
在等待4h-24h、优选8h-12h、尤其优选10h-11h后,可以通过例如抽吸装置将部件从松散材料中释放出来。未粘合粉末在控制筛分后,可返回工艺(重复利用)。
最后,使用压缩空气去除零件上残留的粘合材料。80N/cm2-150N/cm2的强度相当弱,但足以在不破坏或变形的情况下处理它们。
强度增加可以通过在烘箱中以100℃-140℃的温度进行3h-5h的后处理来产生,最终强度达到>200N/cm2。
由于3D打印模塑件具有多孔表面,因此在将其用作铸造或层压模具之前处理打印零件的表面通常是有利的。这将减少界面处的孔隙率,从而在进一步的应用步骤中避免打印材料的表面被穿透,并且可以从打印零件中勾画出铸件或层压件。建造的模具组装或插入传统制造的外部模具中,并用环氧树脂、聚氨酯或聚酯树脂等树脂浇注。此外,还可以使用硅酮或液态固化材料系统。此外,基于玻璃纤维或碳纤维的层压件可以在零件表面的基础上生产。
材料体系固化后,通过使溶剂(最好是水)与模具接触来进行脱模。例如,可以将模具浸入溶剂中或将溶剂倒在模具上。可溶成分迅速溶解,破坏了不可溶粉末的粘性。
不溶性成分也被冲出,可以收集,与可溶性物质重新混合,然后返回到工艺中。为了释放成型零件,要有足够大的间隙足以使不溶性物质与溶剂一起流出。
下面将更详细地解释根据本发明的几个术语。
在本发明的意义上,“3D打印方法”是从现有技术中已知的所有方法,其能够将部件构造为三维模具,并且与所述工艺组件和装置兼容。
根据模塑制品和优化模塑制品生产的要求,本发明意义上的“选择性打印液应用”可在每次铺设颗粒材料或颗粒材料混合物后实施,或在每次铺设颗粒材料后不规则地实施,即非线性和平行实施。因此,在模塑制品生产过程中,“选择性打印液应用”可以单独调整。
本发明意义上的“粘合剂”是指通过溶液或溶剂(例如水溶液)的溶解,使颗粒材料中的固体和不溶性颗粒(例如沙子)相互粘附并在颗粒之间产生相对强度的材料。
本发明意义上的“模塑制品”或“零件”或“模具”或“3D模塑件”是指使用根据本发明的工艺(3D打印工艺)制造并显示尺寸稳定性的所有三维物体。
本文使用的“颗粒材料”或“不溶性颗粒材料”可以是任何已知用于基于粉末的3D打印(例如喷墨工艺)的材料,尤其是沙子、陶瓷粉末、金属粉末、塑料材料、木材颗粒、纤维材料、纤维素或/和乳糖粉末。颗粒材料在干燥时最好是自由流动的粉末,但也可以是粘性、耐切割的粉末或带颗粒的液体。
本发明意义上的“颗粒材料”或“颗粒材料混合物”是指两种或两种以上不同材料的混合物,例如水溶性颗粒材料和水不溶性颗粒材料,本发明进一步描述了这些单独的材料。
本发明意义上的“材料系统”由各种组件组成,通过它们的相互作用,允许逐层构造模塑件;这些不同的组分可以一起使用和沉积,也可以层叠使用。单个组分(例如粘合剂组分)可以存在于一个或两个材料组分中,然后这些组分会影响(例如)所生产模塑件的强度。
“打印液”在本发明的意义上,用于选择性地涂覆于所应用的颗粒材料混合物,并选择性地实现模塑制品的形成。打印液体可包含粘合剂材料,并且这些粘合剂材料可基本上仅存在于颗粒材料混合物中,基本上仅存在于打印液体中,或同时存在于两种材料中。本发明意义上的“打印液”包括或由从水或水溶液和含木质素的组分或其衍生物或改性木质素中选择的液体组成,优选木质素磺酸盐。
“构建区域”是指在构建过程中,通过重复铺设颗粒材料,颗粒材料层生长的几何位置。构建区域通常由底部(即构建平台)、墙壁和开放顶面(即构建平面)界定。
本发明意义上的“铸造材料”指任何可浇铸材料,尤其是那些在加工过程中不会产生温度的材料,此温度可能会削弱冷树脂结合,从而有利于脱模。
就本发明而言,“孔隙率”是在3D打印过程中结合的颗粒之间形成的空腔的迷宫结构。
“密封”作用于打印模具和待填充型腔之间的几何边界。它在表面上密封了多孔模塑制品的孔隙。
“冷铸工艺”尤其是指铸造过程中,模具和型芯的温度在铸造之前、期间和之后均未达到模具材料的分解或软化温度。模具的强度不受铸造工艺的影响。这与金属铸造过程不同,金属铸造过程中,模具通常会被热铸造所缓慢破坏。
术语“处理表面”是指在打印和清洁模具后,在优选单独步骤中处理的铸造模具表面。这种处理方法通常是将一种物质涂在表面,尤其涂在靠近模具或型芯区域的表面。对于涂覆,所有可能的不同工艺方式都会被考虑在内。
通过3D打印模具实现冷铸模具和层压模具在经济上是可取的,尤其是对于更复杂的形状。
本发明的一个方面是提供一种模具,特别是用于冷铸和层压工艺,该模具由基于粉末的增材层制造工艺制成,其中最终模具可以任选地具有经处理的表面,并且可以通过溶剂进行弱化和脱模。
例如,经过处理的表面可以防止浇注料系统或液体粘合剂由于静水压力或毛细管效应而穿透模塑制品。
附图说明
图1:一个简单的打印模塑件作为层压件的层压模具的图示。
图2:在破坏打印部分的同时清洗层压件
图3:带芯层压件
图4:成品层压件
图5:冷铸造的工艺流程,以及随后的模具清洗。
100-水溶性芯;101-围绕水溶性芯的层压件;200-水池;201-带层压件的水溶性芯;202-喷水器;300-溶解模具;301-颗粒材料;302-水;400-层压件;401-水射流;500-成品层压件;600-混凝土;601-模具;602-水溶性模具;603-用水冲洗;604-喷水器;605-脱芯的混凝土件。
具体实施方式
下面将介绍本发明的其他实施例或/和方面。
根据优选实施例,本发明包括包含颗粒材料混合物的材料系统,其中至少一种粉末成分可溶于第二种液体成分。
在另一个方面,本发明涉及一种第一材料组分,其包括至少一种不溶性无机和/或有机颗粒材料和具有类似粒径分布的可溶性、优选水溶性聚合物。
在另一方面,本发明涉及主要由用于调节粘度和表面张力的溶剂和添加剂组成的第二材料组分。
此外,本发明涉及在增材层制造工艺中通过基于粉末床的3D打印,并使用选择性引入颗粒材料中的液体组分来生产水溶性模具。
由于颗粒材料组分的可溶性,通过3D打印由其制成的模塑制品可在温和条件下通过暴露于溶剂(优选水)再次被破坏。
本发明的另一方面涉及一种根据本发明制造冷铸件作为失模或层压件的模具应用。
具体而言,根据本发明的铸造模具可用于生产混凝土铸件和/或冷铸聚合物零件。
优选地,基于粉末床的3D打印工艺用于增材层制造工艺。
如果表面额外用疏水材料密封,如有必要,可以很好地限制浇铸材料渗透到模具孔隙中。
此外,可以通过施胶剂和/或分散剂改变表面的孔隙率,尤其是氧化锆、氧化铝、氧化钙、氧化钛、白垩或硅酸基施胶剂和/或塑料、纤维素、糖、面粉和/或盐基溶液。
此外,表面的孔隙率可以通过油脂、油、蜡和/或热水可溶物质来改变或密封。
示例性实施例
A.根据本发明的用于生产模塑件的示例性装置包括粉末铺粉器。铺粉器将颗粒材料铺设在构建平台上,并使其平滑。所应用的颗粒材料可由多种不溶性材料组成,但根据本发明,由于其成本低,优选与水溶性聚合物混合的沙子。粉末层的高度由构建平台决定。在铺设一层后,降低构建平台。在下一个铺粉工序中,新产生的体积被粉末填充,并平滑去除多余的部分粉末。其结果基本上,甚至是几乎完美的一定高度的平行光滑层。
在铺粉和(如有必要)加热过程之后,使用喷墨打印头在该层上打印将可溶聚合物转移到颗粒材料的液体。打印图像对应于设备当前构建高度下零件的截面。液体冲击颗粒材料并缓慢扩散到其中。
可溶性粘合剂将周围松散的不溶性颗粒物理结合在一起。最初,这种结合强度很低。
在下一步中,将构建平台降低一层厚度,并通过加热对该层进行额外加热。层成形、打印/曝光、加热和降低步骤仅在所需零件完成之前重复。
这个零件现在完全存在于粉末块中。在最后一步中,零件从松散的颗粒材料中释放出来。此外,可通过压缩空气清洁松散的粉末材料。
B.通过吸入空气,可以更快地干燥被未粘合的构建体包围的粘合构建体。
C.生产的零件仍然可以在烘箱中干燥,以进一步提高强度。表面处理后,零件可用于冷铸造或作为层压模具。
D.根据应用目的和要求的表面质量,使用不同平均粒径的不溶性颗粒材料和可溶性聚合物。例如,对于高表面质量,使用平均粒径为60μm-90μm的沙子和可溶性聚合物,允许选择150μm的极细层高度。d50=140μm-250μm的较粗颗粒仅允许250μm-400μm层高。这会产生更粗糙的表面。建造速度也受颗粒材料细度的影响。
下面显示了两个示例,一个是含有可溶成分的颗粒材料,一个是液体材料,以及生成零件的性能示例。
E.示例性颗粒材料:
例1:
由平均粒径为150μm(95%)的沙子和d50为190μm(5%)的沙子组成的颗粒材料在锥形螺旋混合器中混合1h,然后筛分(250μm网目尺寸)。
例2:
F.示例性打印液
示例性打印液(液体组分)的组合物
使用叶片混合器以300rpm的转速搅拌,将木质素磺酸盐(25%)部分添加到蒸馏水中(52%),并搅拌直到固体完全溶解。然后,麦芽糊精(12%)和葡萄糖(10%)也被分次添加,然后是苏芬醇(0.8%),最后是泽塔斯佩斯179(Zetasperse 179)(0.2%)。在以600rpm的转速搅拌另一小时后,过滤混合物(网目尺寸<1μm)(指定用量指混合物总量100%)。
G.示例性打印过程
在实际打印过程之前,构建平台上覆盖一层平均粒径为140μm的铸造砂,并使用红外辐射加热至表面温度90℃。然后进行逐层打印过程,根据构建数据,通过打印头引入打印液,引入量为颗粒材料质量的15%。
H.示例性后处理步骤(可选)
打印工作完成后,向成型箱施加负压1h,通过粉末块吸入环境空气并干燥零件。拆包和精加工后,零件的三点弯曲强度为210N/cm2,残余含水量为0.3%。在60%的最大相对湿度下,零件可以在不变形的情况下储存。
附图的进一步解释描述了本发明的各个方面:
图1显示了制备的水溶性芯(100)作为层压模具的使用,其周围已经有层压件(101)。树脂固化后,将模具置于水池(200)中,并用喷水器(202)额外冲洗。图2显示了溶解模具(300)。颗粒材料(301)的不溶性成分聚集在水池底部。可溶组分完全溶解后,层压件(400)仍然存在,并且仍然可以在水射流(401)下完全清洁(图3)。图4显示了清洁和干燥的层压件。图5显示了在冷铸造中的应用。首先,将水溶性模具(602)置于模具(601)中。浇铸材料,例如环氧树脂或混凝土(600)被倒入模具中。铸造材料固化后,通常在24h后,通过浸渍槽和/或喷水器(604),在温和条件下再次脱模型芯。干燥并与可溶部分混合后,剩余的不可溶材料可重新引入打印过程。因此,该工艺实现了高水平的成本效益,这是一个巨大的优势,尤其是在使用特殊沙时。
Claims (10)
1.一种适用于3D打印工艺或3D打印过程的材料系统,该材料系统包括颗粒材料和打印液,其中所述颗粒材料选自无机颗粒材料中的石英砂、橄榄石砂、角闪石、陶粒、陶瓷、金属粉末或有机颗粒材料中的木粉、淀粉或纤维素粉,颗粒材料未经处理,其中打印液为含水或水溶液并含木质素成分或其衍生物的液体,木质素衍生物优选木质素磺酸盐。
2.根据权利要求1所述的材料系统,其中所述打印液包含极性有机或/和无机液体,即水和/或醇,其中所述材料系统还包含可溶性淀粉水解物麦芽糊精、葡萄糖,其中所述淀粉水解物的葡萄糖当量在1-50之间,优选在3-35之间,尤其优选在3到20之间,醇含量为0.5%-15%,优选在2%-10%,尤其优选在5%-8%之间,其中所述醇为简单醇、二元醇或多元醇或前述醇的混合物,其中所述打印液的粘度为2mPas-20mPas,优选5mPas-15mPas,尤其优选10mPas-14mPas。
4.一种用于生产模塑件的3D打印工艺,所述工艺包括将颗粒材料混合物铺设到构建平面上、选择性涂覆打印液的步骤,其中所述打印液为含水或水溶液并含木质素成分或其衍生物的液体,木质素衍生物优选木质素磺酸盐,对于至少部分选择性固化,有选择地对构建场进行加温或向所应用的颗粒材料混合物中引入能量,优选地将其加温至30℃-60℃,更优选地将其加温至40℃-50℃,并对打印液进行加温,重复这些步骤,直到获得所需模塑件。
5.根据权利要求4所述的3D打印工艺,其中所获得的模塑件与所述非固化颗粒材料混合物分离,并且所述模塑件优选经受进一步的热处理步骤和/或微波辐射处理。
6.根据权利要求4或5所述的3D打印工艺,其中所述颗粒材料混合物是通过铺粉器来铺设的,或/和其中,所述打印液与打印头一起选择性地涂覆,或/和其中,完成打印工艺后,在环境条件下将模塑件留在粉末床中4h-24h,优选8h-15h,更优选10h-11h。
7.根据权利要求4-6中任一权利要求所述的3D打印工艺,其中所述模塑件在打印工艺完成后通过整个非打印和打印区域吸入气体或气体混合物、优选环境空气,进行干燥和/或固化,其中吸入时间在打印结束后0h-24h,优选0h-12h,尤其优选在打印结束后直接进行,抽吸进行0.5-2h,优选进行1h,并且优选模塑件具有150N/cm2至200N/cm2的强度或/和其中,在附加步骤中,对模塑件进行热处理,优选将模塑件在30℃-160℃下存放0.5h-7h、更优选在50℃-140℃下存放1h-6h,其中优选在打印过程之前和/或期间和/或之后通过红外灯以支撑方式进行热处理,或其中,在附加步骤中,用微波辐射对模塑件进行处理,处理时间为2min-30min,优选2min-15min,尤其优选2min-10min。
8.根据权利要求4-7中任一权利要求所述的3D打印工艺,其中所述模塑件的表面进一步涂覆或密封。
9.根据权利要求4-8中任一权利要求所述的3D打印工艺,其中使用根据权利要求1-3中任一权利要求所述的材料系统。
10.权利要求1-3中任一项所述的材料系统在3D打印过程中的应用,或通过权利要求4-9中任一项所述3D打印工艺生产的模塑件,其中所述模塑件在环境条件下留在粉末床中4h-24h、优选8h-15h、尤其优选10h-11h,在打印方向上具有80N/cm2-150N/cm2的强度,并且在30℃-160℃下热处理1h-7h,优选在50℃-140℃下热处理4h-6h后,其强度大于200N/cm2,优选在180-250N/cm2,更优选240N/cm2;所述模塑件用于合成树脂或液态凝固系统的冷铸,或用作层压模具。
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WO2021083446A1 (de) | 2021-05-06 |
US20240083110A1 (en) | 2024-03-14 |
EP4051652A1 (de) | 2022-09-07 |
US11820076B2 (en) | 2023-11-21 |
DE102019007595A1 (de) | 2021-05-06 |
US20220371267A1 (en) | 2022-11-24 |
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