Starch-based modified composite material for 3D printing

Abstract

The invention discloses a starch-based modified composite material for 3D printing. The starch-based modified composite material comprises a basic power material and a water-based bonding solution, wherein the basic power material comprises, by weight, 40-60 parts of modified starch, 30-45 parts of wood fiber, 25-40 parts of maltodextrin and 15-35 parts of inorganic filler; the water-based bonding solution comprises 90 parts of solvent, 5 parts of ethylene glycol, 5 parts of ethylene glycol diacetate and 5 parts of isopropanol. A preparation method of the modified starch includes: evenly mixing water, modifying agent and starch, using sodium hydroxide to regulate pH to be alkaline, performing reaction under 45 DEG C for 10 hours, and collecting solid starch after the reaction; adding alcohol and catalyst into the solid starch, performing reflux under 60-90 DEG C for 45 hours, collecting the solid after the reaction, and drying to obtain the modified starch. The starch-based modified composite material has the advantages that the starch is modified, the forming stability and mechanical performance of the material are increased, the modified composite material is biodegradable and environmentally friendly, and the biodegradability of the material is increased.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a starch-based modified composite material used in 3D printing. Background technique [0002] Three-dimensional rapid prototyping technology is a relatively popular technology in manufacturing technology. It is a stacked manufacturing technology. Its principle is to create objects by adding materials to objects layer by layer. It obtains the path, limitation and method of stacking through discrete, and forms a three-dimensional entity through the superposition of stacked materials, which is combined with a computer system to improve the efficiency and accuracy of rapid prototyping, which is in stark contrast to the traditional removal molding. Construction, approximate processing, slice processing, section processing, section superposition, post-processing, etc. [0003] Among them, the 3DP process adopts three-dimensional three-dimensional molding. The section of the part i...

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Problems solved by technology

[0004] Different rapid prototyping technologies have different requirements for forming materials, but rapid and accurate prototyping is a requirement for 3D printing materials, and the forming materials largely determine the success or failure of rapid prototyping technology, but the commonly used 3D rapid prototyping materials have the following defects : (1) The material contains a large number of components that are difficult to degrade, which puts pressure on the environment; (2) The cost of the material is high, and for small enterprises, the production cost pressure is high; (3) The fluidity of the powder material is poor , there will be a phenomenon of material accumulation in the mold, which will not only affect the printing efficiency, but also cause the surface of the product to be rough, affecting the quality of the printed product; (4) The material is formed and solidified slowly, which affects the printing efficiency and printing accuracy

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