Preparation method of electric field assisted continuous surface exposure 3D printing ordered composite material

A composite material, 3D printing technology, applied in the field of 3D printing, can solve the problems of high mold requirements, limited size, high production cost, etc., to improve mechanical and electrical properties, increase bending strength and toughness, and aging speed. reduced effect

Active Publication Date: 2021-05-28
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these processes have a place in existing production, they also have very obvious disadvantages
[0005]1. Hand lay-up: low production efficiency and high labor intensity;
[0006]2. Compression molding and autoclave molding: high mold requirements, high production costs, and limited size;
[0007] 3. Pultruding: high equipment investment and limited product cross-section; winding molding: large investment and high technical requirements
[0008] None of them are suitable for complex three-dimensional structures, which limits the application and popularization of graphene / polymer composites
The existing 3D printing technology will cause the agglomeration or deposition of graphene, resulting in the failure of the formed material to give full play to the excellent mechanical and electrical properties of graphene
[0009] The continuous printing of electric field assisted photo-curing cannot be realized in the existing technology, and the existing continuous printing device cannot realize the uniform distribution of graphene inside the printed part.

Method used

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  • Preparation method of electric field assisted continuous surface exposure 3D printing ordered composite material
  • Preparation method of electric field assisted continuous surface exposure 3D printing ordered composite material
  • Preparation method of electric field assisted continuous surface exposure 3D printing ordered composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0071] A method for preparing an electric field-assisted continuous surface exposure 3D printed graphene / resin ordered composite material, comprising the following steps:

[0072] Step 1: Print Model Preparation

[0073] First, import the 3D graphics into the slicing software in STL file format, and slice the model in layers after considering the printing time, material curable thickness, and accuracy requirements; then make the sliced ​​data into video files and import them into digital light processing module;

[0074] Step 2: Composite slurry preparation

[0075] Mix 95 wt.% ethoxylated trimethylolpropane triacrylate and 5 wt.% glycidyl methacrylate to obtain A, mix 53 wt.% epoxy resin 828 and 47 wt.% 4-methylhexahydrophthalic anhydride Mix to obtain B, then mix 40wt.%A and 60%wt.B to obtain C, then mix 99.6wt.%C with 0.4wt.% photoinitiator, and then ball mill and mix with graphene according to the mass fraction of 99:1 , the ball milling parameters are speed: 500r / min; ...

Embodiment 2

[0085] Different from Example 1, the composite oxygen permeable membrane is made of PDMS / SiO 2 Composition, in which the upper layer is a surface-etched PDMS film with a thickness of 10 μm; the lower layer is PDMS / SiO 2 Composite film with a thickness of 50 μm.

[0086] Test result shows, embodiment 1 and 2 all realized the continuous orderly preparation of graphene / resin ordered composite material, avoided the deposition and agglomeration of graphene in resin; The resistivity of the composite material is about 1 / 16 of the disordered composite material, and within a certain range, the higher the graphene content in the ordered composite material, the smaller the resistivity, showing excellent electrical properties; in mechanical properties In terms of flexural strength, the ordered composite material is significantly better than the disordered composite material, and the maximum strain of the ordered composite material is 24%, and the maximum strain of the disordered composit...

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Abstract

The invention discloses a preparation method of an electric field assisted continuous surface exposure 3D printing ordered composite material. Printing equipment comprises a digital light processing module, a slurry tank, a printing platform and external electric fields, wherein the digital processing module is sliced in a layered mode according to a printed model, penetrates through a composite oxygen permeation membrane in a light beam mode and is projected to slurry to achieve curing; as the printing platform gradually moves upwards in the z-axis direction, the external electric fields are arranged on the two sides of the interior of the slurry tank, so that continuous printing of a graphene / resin composite material is achieved; and graphene sheets are orderly arranged under an auxiliary electric field to realize printing of an anisotropic / ordered composite material, so that the mechanical property and the electrical property are improved, and the bending strength and the toughness of the material are improved.

Description

technical field [0001] The invention relates to the field of 3D printing, in particular to a method for preparing an ordered composite material for electric field-assisted continuous surface exposure 3D printing. Background technique [0002] At present, 3D printing technology has been widely used in electronics, medical, aerospace and other fields. The light-curing 3D printing technology with Digital Light Processing as the core has the advantages of high molding precision, fast printing speed, and mature technology. Its printing material, photosensitive resin, belongs to a kind of high molecular polymer, which is rapidly transformed from liquid to solid under the action of light. In recent years, photosensitive resins for 3D printing have made great progress in enhancing performance and functionalization of materials by adding reinforcements such as fibers and powders to materials, or certain polymers. However, the distribution of reinforcements in some composite materia...

Claims

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Application Information

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IPC IPC(8): B29C64/314B29C64/379B29C64/264B29C64/106B29C64/295B33Y10/00B33Y30/00B33Y40/10B33Y40/20
CPCB29C64/314B29C64/379B29C64/264B29C64/106B29C64/295B33Y10/00B33Y30/00B33Y40/10B33Y40/20
Inventor张广明周欣琪李惠怡周雁祥宋伊凡宋道森蒋进
OwnerQINGDAO TECHNOLOGICAL UNIVERSITY