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A method of ink direct writing three-dimensional printing based on near-infrared photopolymerization

A near-infrared light and three-dimensional printing technology, which is applied in processing and manufacturing, manufacturing tools, additive manufacturing, etc., can solve problems such as limitation, short wavelength of light, unfavorable mechanical properties, etc., achieve good penetration, improve mechanical properties, and avoid structure The effect of collapse

Active Publication Date: 2021-03-30
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, for thermosetting inks, when forming lines with large diameters or large volumes, due to the influence of the ink's own gravity, the structure is prone to defects or collapses, so thermosetting inks are limited to small-scale 3D printing applications.
[0004] On the other hand, for light-curable inks, ultraviolet light (UV) or blue light is usually used as the light source to cooperate with DIW for real-time curing. It is easy to cause a low degree of curing of the wire core, which is not conducive to mechanical properties; in addition, because the light source is difficult to cover multiple structures at the same time and cure quickly, it is difficult for the UV-curable type to achieve DIW array printing to improve printing efficiency.

Method used

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  • A method of ink direct writing three-dimensional printing based on near-infrared photopolymerization
  • A method of ink direct writing three-dimensional printing based on near-infrared photopolymerization
  • A method of ink direct writing three-dimensional printing based on near-infrared photopolymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] figure 1 It is a near-infrared photopolymerized ink direct-writing three-dimensional printing device, which is composed of a support table 1, a near-infrared light emitting structure 2, a controller 3, a direct-writing nozzle 4, and an ink storage tank 5.

[0038] Among them, the support platform 1 is used to support the three-dimensional object 6; the near-infrared light emission structure 2 is located above the support platform 1, and is fixedly connected with the controller 3, and the controller 3 drives the near-infrared light emission structure 2 to move or remain still; the direct writing nozzle 4 is located on the Above the support table 1, the direct writing nozzle 4 is sealed and connected to the ink storage tank 5, and the direct writing nozzle 4 and the ink storage tank 5 are fixedly connected to the controller 3, and the controller 3 drives the direct writing nozzle 4 and the ink storage tank 5 to move or stay still.

[0039] The raw material 1.0wt% initiato...

Embodiment 2

[0041] Utilize near-infrared light to solidify in real time: adopt the same process parameters of the ink in Example 1, the direct writing printing equipment and its working parameters, and only use the 0.41mm nozzle for grid printing (first control the direct writing nozzle to reciprocate in the horizontal plane, and then control The direct writing nozzle is lifted up and the original direction of motion is changed to continue the reciprocating motion), and the following is obtained: image 3 The 3D printed object shown on the right.

[0042]For curing after printing by using near-infrared light: using the same ink process parameters, direct writing printing equipment and its working parameters as above, using a 0.41mm nozzle for grid printing, the ink moves and extrudes with the direct writing nozzle to obtain a shape, And use near-infrared light to cure after the end of extrusion, to obtain such as image 3 The 3D printed object shown on the left.

[0043] A comparison is...

Embodiment 3

[0045] The working setting of the ink direct writing three-dimensional printing equipment of near-infrared photopolymerization is the same as embodiment 1. With 1.0%wt initiator (Irgacure784), 1.0wt%NaYF4:Yb, Tm up-converting nanoparticles, 0.5wt% color paste (red, Yellow, blue, white), 12.5wt% thixotropic agent (gas silicon, Evonik TS100), 42.5wt% epoxy acrylate resin and 42.5wt% monomer trimethylolpropane acrylate (TMPTA) weighed in The mixing and defoaming machine is fully mixed to obtain ink (elastic modulus G' is 0.49kPa, loss modulus G" is 0.25kPa). Fill the ink into the printer, control the extrusion pressure to 50kPA, and use a 1.55mm direct writing nozzle , the laser power is 3.5W, and the printing speed is controlled at 1.0mm / s. Lines of different colors can be obtained, and the results are as follows Figure 4 shown. Such as Figure 5 As shown, according to the ultraviolet-visible light absorption spectrum, the absorption band (300-500nm) of the initiator used ove...

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Abstract

The invention relates to a method technology of ink direct writing three-dimensional printing based on near-infrared photopolymerization, and belongs to the technical field of material processing. The method is as follows: the direct writing nozzle moves or is still in the three-dimensional space, the ink is extruded from the direct writing nozzle, and after being irradiated by near-infrared light, the three-dimensional object is formed after curing, and the curing time t does not exceed the near-infrared light diameter d l vs. ink extrusion speed v i Ratio, ie t≤d l / v i . Since near-infrared light has better medium penetration, it can penetrate the structure during molding to promote a higher degree of solidification inside and outside, so that 3D printing of cross-scale structures can be realized, and the method provided by the present invention is accurate The curing process of the ink is controlled, so as to realize the real-time curing of the DIW array 3D structure.

Description

technical field [0001] The invention relates to a method technology of ink direct writing three-dimensional printing based on near-infrared photopolymerization, and belongs to the technical field of material processing. Background technique [0002] The current 3D printing technology is mainly oriented to metal materials, ceramic materials and polymer materials; the 3D printing of polymer materials is usually carried out through thermal assistance or light assistance. Direct writing technology (DIW, Direct Ink Writing) is often used as the implementation method of 3D printing. It can use thermosetting or photosetting 3D printing ink to realize additive manufacturing. It has been widely used in the fields of microstructure molding and smart device preparation. [0003] The inks currently used in DIW-based 3D printing are usually heat-curable or ultraviolet (UV)-curable. Among them, for thermosetting inks, when forming lines with large diameters or large volumes, the structur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C64/106B29C64/264B33Y10/00B33Y30/00
CPCB29C64/106B29C64/264B33Y10/00B33Y30/00B33Y70/00C08F2/46C08F222/103C08F222/1067C09D11/101C09D11/322C09D11/38C09D11/03B33Y80/00B29C64/209B29C64/129C09D11/107
Inventor 刘仁刘禹朱俊哲
Owner JIANGNAN UNIV
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