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Coating sand for three-dimensional printing and preparation method of coating sand

A technology of three-dimensional printing and coated sand, applied in the field of coated sand, can solve the problems of low strength and poor thermal stability of coated sand, and achieve the effects of high precision, good product strength and improved high temperature resistance.

Active Publication Date: 2019-05-14
苏州轻金三维科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the technical bottlenecks such as poor thermal stability and low strength of the existing coated sand, and develop a high-temperature-resistant three-dimensional printing coating with strong high-temperature resistance, high product precision, and not easily deformed. Sand and its preparation method

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  • Coating sand for three-dimensional printing and preparation method of coating sand

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Effect test

Embodiment 1

[0041] This embodiment provides coated sand for three-dimensional printing, and its parts by weight are: 70 parts of chromite sand, 7 parts of aluminum silicate sand, 7 parts of zircon sand, 16 parts of refractory particles, 8 parts of magnesium hydroxide, 0.2 parts of calcium stearate, 0.2 parts of magnesium stearate, 5 parts of epoxy resin binder, 4 parts of DH-6 strengthening agent, 4 parts of JDA type collapsing agent, 1 part of 592 modified curing agent; composition of refractory particles The ingredients and their proportions by weight are: 20 parts of chromite sand, 20 parts of enstatite sand, 4 parts of refractory fiber, and 10 parts of graphite powder.

[0042] In this embodiment, the coated sand for 3D printing is prepared through the following steps:

[0043] (1) Add chromite sand, aluminum silicate sand and zircon sand to the sand mixer for low-speed stirring, and the stirring speed is 300rpm;

[0044] (2) During the stirring process, the sand mixer is heated up. ...

Embodiment 2

[0048]This embodiment provides coated sand for three-dimensional printing, and its parts by weight are: 250 parts of chromite sand, 25 parts of aluminum silicate sand, 25 parts of zircon sand, 8 parts of refractory particles, 4 parts of magnesium hydroxide, 1 part of calcium stearate, 1 part of magnesium stearate, 15 parts of polyurethane binder, 8 parts of DH-2 strengthening agent, 8 parts of WK type collapsing agent, 10 parts of diaminocyclohexane curing agent; composition of refractory particles The ingredients and their proportions by weight are: 30 parts of chromite sand, 10 parts of enstatite sand, 10 parts of refractory fiber, and 4 parts of graphite powder.

[0049] In this embodiment, the coated sand for 3D printing is prepared through the following steps:

[0050] (1) Add chromite sand, aluminum silicate sand, and zircon sand into the sand mixer for low-speed stirring, and the stirring speed is 600rpm;

[0051] (2) During the stirring process, the sand mixer is heat...

Embodiment 3

[0055] This embodiment provides coated sand for three-dimensional printing, and its parts by weight are: 160 parts of chromite sand, 16 parts of aluminum silicate sand, 16 parts of zircon sand, 12 parts of refractory particles, 6 parts of magnesium hydroxide, 0.6 parts of calcium stearate, 0.6 parts of magnesium stearate, 10 parts of acrylic binder, 6 parts of DH-5 strengthening agent, 6 parts of LK type collapsing agent, 5.5 parts of diaminodiphenylmethane curing agent; The components and their proportions by weight are: 25 parts of chromite sand, 15 parts of enstatite sand, 7 parts of refractory fiber and 7 parts of graphite powder.

[0056] In this embodiment, the coated sand for 3D printing is prepared through the following steps:

[0057] (1) Add chromite sand, aluminum silicate sand and zircon sand to the sand mixer for low-speed stirring, and the stirring speed is 450rpm;

[0058] (2) During the stirring process, the sand mixer is heated up. When the temperature rises ...

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Abstract

The invention discloses coating sand for three-dimensional printing and a preparation method of the coating sand. The coating sand is prepared from the following raw materials in parts by weight: 70-250 parts of chromite sand, 7-25 parts of aluminum silicate sand, 7-25 parts of zircon sand, 8-16 parts of fire-resistant fine particles, 4-8 parts of magnesium hydroxide, 0.2-1 part of calcium stearate, 0.2-1 part of magnesium stearate, 5-15 parts of a binder, 4-8 parts of a reinforcing agent, 4-8 parts of a dispersing agent and 1-10 parts of a curing agent. According to the coating sand of three-dimensional printing, the high-temperature resistance and the stability of the coating sand are improved through the addition of the aluminum silicate sand, the zircon sand, the fire-resistant fine particles and a magnesium hydroxide flame retardant, a melting phenomenon does not appear when the prepared coating sand is at 3,300 DEG C, while a commercially available common coating sand is completely melted at 2,750 DEG C. The calcium stearate, the magnesium stearate, the reinforcing agent and the dispersing agent are added at the same time, and the fluidity, the air permeability and the strength of the coating sand are obviously improved through the combination of the chromite sand, the aluminum silicate sand and the zircon sand.

Description

technical field [0001] The invention relates to a coated sand, in particular to a coated sand for three-dimensional printing and a preparation method thereof. Background technique [0002] Sand casting is an ancient production technology that has been the dominant process for producing castings for thousands of years. In recent years, with the advancement of science and technology, additive manufacturing and digital manufacturing are gradually entering the field of traditional manufacturing. Among them, the use of three-dimensional printing (referred to as 3D printing) to cast sand molds can realize moldless casting, which greatly shortens the casting cycle and improves the dimensional accuracy of castings, realizing digital manufacturing. [0003] Coated sand is a material used for modeling in 3D printing. Coated sand is generally made by mixing molding materials such as raw sand for foundry, molding sand binder and auxiliary additives in a certain proportion. Coated san...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C1/02B33Y70/00
Inventor 刘文才李俊锋
Owner 苏州轻金三维科技有限公司