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Modified polyformaldehyde supporting material for 3D printing and preparation method thereof

A technology of 3D printing and supporting materials, applied in the field of new materials, can solve the problem of undisclosed polyoxymethylene

Active Publication Date: 2014-06-25
SHANGHAI RES INST OF MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent application number 201310412518.1 discloses a modified polyoxymethylene material that improves the shrinkage of polyoxymethylene materials and its preparation method. The raw materials include polyoxymethylene raw materials, alkali-free glass fibers, antioxidants, colorants, and ultraviolet light absorbers. , light stabilizer, dispersant lubricant, glass fiber compatibilizer, etc., can be used in the fields of electronic appliances, machinery, instruments, daily light industry, automobiles, building materials, etc. However, there is no disclosure in the prior art that polyoxymethylene can be used In 3D printing technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 8 kg of pre-dried polyformaldehyde, 0.7 kg of silicone oil, and 1.3 kg of calcium carbonate are mixed in a plastic mixer for 1 minute and discharged. The mixed materials are blended and pelletized in a single / twin screw extruder, and the temperature of the extruder is set at 180°C to prepare a support material for 3D printing. When printing, put the prepared 1.75mm or 3mm polyoxymethylene wire in the 3D printer's material box, the print head can be set at 200-220℃, the hot bed temperature can be at 50-90℃, and the printing speed can be set at 25- 75mm / s, after the print head and hot bed rise to the set temperature, start printing and molding. After printing, place the printed product in a dilute hydrochloric acid solution. After about 30 minutes, the POM printed and molded part will melt.

Embodiment 2

[0023] Mix 8.5 kg of pre-dried polyformaldehyde, 0.4 kg of paraffin wax, and 1.1 kg of talc in a plastic mixer for 1 minute and discharge. The mixed material is blended and pelletized in a single / twin screw extruder, and the temperature of the extruder is set at 170°C to prepare a support material for 3D printing, which can be dissolved in an acid solution. When printing, put the prepared 1.75mm or 3mm polyoxymethylene wire in the 3D printer's material box, the print head can be set at 200-220℃, the hot bed temperature can be at 50-90℃, and the printing speed can be set at 25- 75mm / s, after the print head and hot bed rise to the set temperature, start printing and molding. After printing, place the printed product in a dilute hydrochloric acid solution. After about 30 minutes, the POM printed and molded part will melt.

Embodiment 3

[0025] Mix 9 kg of pre-dried polyformaldehyde, 0.2 kg of titanate, 0.8 kg of calcium carbonate and talc in a plastic mixer for 2 minutes, and then discharge. The mixed materials are blended and pelletized in a twin-screw extruder. The temperature of the extruder is set at 185°C to prepare a support material for 3D printing, which can be decomposed in acid gas. When printing, put the prepared 1.75mm or 3mm polyoxymethylene wire in the 3D printer's material box, the print head can be set at 200-220℃, the hot bed temperature can be at 50-90℃, and the printing speed can be set at 25- 75mm / s, after the print head and hot bed rise to the set temperature, start printing and molding. After printing, place the printed product in a dilute hydrochloric acid solution. After about 30 minutes, the POM printed and molded part will melt.

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PUM

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Abstract

The invention relates to a modified polyformaldehyde supporting material for 3D printing and a preparation method thereof. According to the method, the modified polyformaldehyde supporting material is prepared from the following raw materials by weight percent: 80-100 percent of polyformaldehyde, 0-7 percent of surface active agent and 0-13 percent of packing, wherein the content of polyformaldehyde is smaller than 100 percent, and the content of the surface active agent and the packing is larger than zero; the raw materials are put in a plastic mixer and mixed for 1-2 minutes to obtain a premix, the premix is put in a single screw extruder or a double screw extruder for extrusion and wire drawing by controlling the diameter of wires at 1.75 mm, so that the modified polyformaldehyde supporting material for 3D printing is obtained. Compared with the prior art, the invention provides the novel application and novel development of the modified polyformaldehyde, the modified polyformaldehyde material prepared according to the method has the characteristic of dissolving in an acidic liquid or gas decomposition, and has certain mechanical strength through modification treatment.

Description

Technical field [0001] The invention belongs to the field of new materials, and in particular relates to a modified polyoxymethylene support material that can be used for 3D printing and a preparation method thereof. Background technique [0002] Fused Layered Molding (FDM) in 3D printing is to use the characteristic of engineering plastic filaments (such as ABS, PLA, etc.) to melt and accumulate near the melting point to print three-dimensional products. When the product has a recessed or hollow structure, the support material is selected for printing and molding, and then immersed in a specific solution or atmosphere to fully dissolve the support material to obtain a product with a special structure. Supporting materials play an important role in the printing of special-shaped parts and are related to the application and promotion of 3D printing. At present, there is only modified ABS as the support material on the market, and it depends on foreign imports. [0003] The molecul...

Claims

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Application Information

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IPC IPC(8): C08L59/02C08L83/04C08L59/04C08K13/02C08K3/26C08K3/34C08K5/10B29C47/92B29C48/92
CPCB29C48/92B29C2948/92609B29C2948/92695
Inventor 李小慧顾哲明金石磊
Owner SHANGHAI RES INST OF MATERIAL
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