Quickly-removable propping material for melt deposition molding and preparation method thereof

A technology of fused deposition molding and supporting materials, which is applied in the field of 3D printing technology and plastic processing, can solve the problems of damage to the surface smoothness of printed parts, cannot be removed very conveniently and quickly, and reduce the polarity of polyvinyl alcohol materials, etc., to achieve large Large-scale promotion of production, low requirements for process conditions and production equipment, and enhanced mechanical properties

Active Publication Date: 2016-05-18
西安泰辉机械科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure that the support material can be removed quickly after FDM processing, it is usually necessary to place it in an aqueous solution of strong alkali or strong acid, which will damage the surface smoothness of the printed part and easily cause injury to the operator
CN103380156A discloses a maleic anhydride copolymer as a support material for FDM, which can be quickly removed in a weaker alkaline medium while ensuring thermal stability, and the support material can be quickly removed in a weaker alkaline medium (pH value The removal time in 8) is usually more than two hours, and the water solubility is still not ideal
However, the auxiliary agents such as diethyl citrate and triethyl citrate involved in the patent CN104448641A cannot effectively destroy the hydrogen bonds in polyvinyl alcohol and achieve the effect of plasticizing. On the contrary, due to poor compatibility, diethyl citrate Additives such as esters will precipitate on the surface of the material after blending and extruding with polyvinyl alcohol, seriously affecting its product performance
In addition, it should be noted that, consistent with the previous description, the addition of plasticizers will reduce the polarity of the polyvinyl alcohol material to a certain extent, and the water solubility of the material will be affected to a certain extent. As a support material, it still cannot be used after printing. very easy and quick removal

Method used

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  • Quickly-removable propping material for melt deposition molding and preparation method thereof
  • Quickly-removable propping material for melt deposition molding and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] A method for preparing a support material for fused deposition modeling, comprising the following steps:

[0035] (1) Drying treatment of raw materials: polyvinyl alcohol, acid agent, alkali agent, plasticizer, filler and additives are dried at a constant temperature of 80°C for more than 5 hours to remove residual moisture and dry the raw materials completely;

[0036] (2) Mixing of raw materials: First mix the acid agent and plasticizer evenly, then put it into a high-speed mixer together with polyvinyl alcohol, fillers and additives and mix it, then add alkali agent and antioxidant, and mix it for 10 Cool to room temperature after minutes;

[0037] (3) Heated extrusion: Add the mixed raw materials into the twin-screw extruder, and keep the feeding speed uniform and smooth to ensure that there is no blockage during the extrusion process, and the filament is stable and smooth. The first stage temperature during the twin-screw extrusion process 160°C, the temperature o...

Embodiment 1~3

[0040] Table 1 is the specific formulation and performance test results of the support materials prepared in Examples 1-3.

[0041] Table 1 Embodiment 1-3 and comparative example 1 material formula (weight / part)

[0042]

[0043] The support materials prepared in Comparative Example 1 and Examples 1-3 were tested for water solubility, processability, mechanical properties and melt index, and the test results are shown in Table 1. In terms of water solubility, compared with Comparative Example 1, the time for the support material prepared in Examples 1-3 to start to dissolve does not change much, but the time for complete dissolution is significantly reduced, and it can be observed that a large number of bubbles in the solution are produced during dissolution, which shows that This is because when water is wetted on the surface of the support material and begins to dissolve, the acid and alkali agents can dissolve and undergo an acid-base reaction to generate carbon dioxide ...

Embodiment 4~8

[0053] Table 2 is the specific formulation and performance test results of the support materials prepared in Examples 4-8.

[0054] Table 2 Example 4-8 material formulation (weight / part) and performance test results

[0055]

[0056] It can be seen from Table 2 that the support material prepared within the composition range of the present invention has excellent water solubility and processability, and the material can be quickly dissolved and removed within 40 minutes at room temperature, which is very suitable for use as a support material for FDM .

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Abstract

The invention discloses a quickly-removable propping material for melt deposition molding and a preparation method thereof. The propping material contains 100 parts of polyvinyl alcohol, 5-20 parts of acid, 5-20 parts of alkali, 25-40 parts of plasticizer, 0.1-2 parts of antioxidant and 0.1-10 parts of filler aid. The acid and alkali in the propping material can quickly react to generate gas when contacting water, so that the propping material can be disintegrated and pulverized, thereby accelerating the dissolution; and thus, the propping material can be completely removed within a short time (40 minutes). Meanwhile, the propping material can be removed without any strongly-acidic or strongly-alkaline water solution, can be quickly removed in common tap water, and thus, can not cause physical injury to the operating personnel. The added acid and alkali can enhance the mechanical properties of the propping material, and can further enhance the processability of the polyvinyl alcohol wire under the synergistic action of the plasticizer.

Description

technical field [0001] The invention relates to a fast-removing supporting material for fused deposition molding and a preparation method thereof, and relates to the fields of 3D printing technology and plastic processing. Background technique [0002] 3D printing technology, also known as additive manufacturing technology, is a technology that uses bondable materials such as powdered metal or plastic to construct objects by layer-by-layer printing based on digital model files. 3D printing technology has been applied in many fields such as information technology, material science, and precision machinery, and it is becoming more and more competitive in today's manufacturing industry, so it is called "manufacturing technology with industrial revolution significance". At present, 3D printing technologies include fused deposition modeling, selective laser sintering, stereolithography and other technologies. Among them, Fused Deposition Molding (Fused Deposition Molding, FDM) i...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08L71/02C08K13/02C08K5/053C08K5/092C08K3/26C08K5/098B33Y70/00B29C47/92B29C48/92
CPCB29C48/92B29C2948/92704C08K3/26C08K5/053C08K5/092C08K5/098C08K5/20C08K13/02C08K2003/262C08K2201/014C08L29/04C08L71/02C08K2003/265
Inventor 于翔王延伟王绍杰徐茜丁宁
Owner 西安泰辉机械科技有限公司
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