A kind of preparation method of 3D printing polyimide parts

A technology for printing polyimide and polyamide, applied in the field of 3D printing, can solve the problems of inability to maintain shape stability and dimensional accuracy for a long time, dimensional deformation, and difficulty in extrusion printing of polyimide solution.

Active Publication Date: 2021-04-23
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the extrusion printing of polyimide solution with low concentration (mass percentage concentration ≤ 5%) is very difficult, and the printed products will have defects such as collapse and dimensional deformation during natural placement or heat treatment, and cannot be maintained for a long time. Formally stable and dimensionally precise

Method used

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  • A kind of preparation method of 3D printing polyimide parts
  • A kind of preparation method of 3D printing polyimide parts
  • A kind of preparation method of 3D printing polyimide parts

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preparation example Construction

[0032] The invention provides a kind of preparation method of 3D printing polyimide parts, comprises the following steps:

[0033] Extruding the polyamide solution to obtain an uncured wire;

[0034] performing pre-curing and 3D printing on the uncured wire in sequence by using an auxiliary solvent to obtain a solid wire;

[0035] The solid wire is formed into a printing pre-cured part under the control of the three-dimensional platform;

[0036] Heat-treating the printed pre-cured part to obtain a 3D printed polyimide part;

[0037] The mass percentage of the polyamide solution is 5-60%, and the viscosity is 0.1-50000Pa·s;

[0038] The auxiliary solvent includes one or more of water, alcohol solvents, nitrogen-containing solvents, sulfur-containing solvents, ketone solvents and furan solvents.

[0039] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0040] The i...

Embodiment 1

[0062] use image 3 The device shown and Figure 4 For the preparation of the process flow shown, the polyamic acid solution (20% by mass, viscosity 10Pa·s) is placed in the extrusion syringe and extruded, the wire is extruded into the solvent tank, and the removed solution is sprayed. Ionized water is sprayed onto each surface of the wire for 20 minutes, and the uncured wire is pre-cured at room temperature to obtain a solid wire; the solid wire forms a printed pre-cured part under the control of the three-dimensional platform;

[0063] Under the condition of a pressure of 90kPa, put the printed pre-cured part in an oven for gradient heating heat treatment. The heating rate is constant at 2°C / min. After the temperature is raised to 100°C, it is kept for 2 hours, after the temperature is raised to 200°C, it is kept for 1 hour, and the temperature is raised. Heat it at 300°C for 1 hour, and heat it up to 350°C for 1 hour to obtain a 3D printed polyimide part.

[0064] In this...

Embodiment 2

[0066] use image 3 The device shown and Figure 4 For the preparation of the process flow shown, the polyamic acid solution (50% by mass, viscosity 10000Pa·s) is placed in the extrusion syringe and extruded, and the wire is extruded into the deionized water contained in the solvent tank , soaking at room temperature for 5 minutes, the uncured wire is pre-cured to obtain a solid wire; the solid wire forms a printed pre-cured part under the control of a three-dimensional platform;

[0067] Under the condition of a pressure of 90kPa, put the printed pre-cured part in an oven for gradient heating heat treatment. The heating rate is constant at 2°C / min. After the temperature is raised to 100°C, it is kept for 2 hours, after the temperature is raised to 200°C, it is kept for 1 hour, and the temperature is raised. Heat it at 300°C for 1 hour, and heat it up to 350°C for 1 hour to obtain a 3D printed polyimide part.

[0068] The diameter of the single filament of the printed pre-cu...

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Abstract

The invention provides a method for preparing a 3D printing polyimide part, and relates to the technical field of 3D printing. The preparation method of the 3D printing polyimide product provided by the present invention comprises the following steps: extruding the polyamide solution to obtain an uncured wire; using an auxiliary solvent to pre-cure the uncured wire to obtain a solid wire; The solid wire under the control of the three-dimensional platform forms a printed pre-cured part; the printed pre-cured part is heat-treated to obtain a 3D printed polyimide part; the mass percentage of the polyamide solution is 5-60%, The viscosity is 0.1-50000Pa·s; the auxiliary solvents include water, alcohol solvents, nitrogen-containing solvents, sulfur-containing solvents, ketone solvents and furan solvents. The preparation method provided by the invention can realize rapid pre-curing of low-concentration polyimide inks that are difficult to print and form, and can maintain the shape stability and dimensional accuracy of 3D printed polyimide parts for a long time.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a preparation method of 3D printing polyimide parts. Background technique [0002] Polyimide has excellent comprehensive properties and is widely used in aerospace, automobile manufacturing, microelectronics, photosensitive resin and self-lubricating materials and other fields. While the rigid molecular chain of aromatic polyimide endows the material with excellent performance, it also brings about processing problems such as insoluble and infusible. At present, the molding process of three-dimensional polyimide parts mainly adopts the molding method. The polyimide parts prepared by this method have good mechanical properties, but the molding accuracy is very limited, and it takes a high cost for irregular or complex shape parts. Cost to make molds. [0003] 3D printing technology is a method of importing digital files and accumulating materials layer by layer. It is charac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C64/118B29C64/30B29C64/314B29C71/02B33Y10/00B33Y40/10B33Y40/20
CPCB29C71/02B29K2077/00B33Y10/00B33Y40/00B29C64/118B29C64/30B29C64/314
Inventor 王晓龙杨昌郭玉雄秦世煜周峰
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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