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Flame retardant as well as preparation method and use method thereof

A technology of flame retardant and boron-based flame retardant, which is applied in the field of 3D printing, can solve the problems of difficulty in uniform mixing of flame retardant and foundry sand, and easy reaction with curing agent, so as to improve curing strength and flame retardant performance, Effect of preventing porosity and improving casting quality

Pending Publication Date: 2022-07-29
NINGXIA KOCEL MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, in order to solve the technical problems that the existing flame retardant and foundry sand are difficult to mix uniformly and easily react with the curing agent, the present invention provides a flame retardant for 3D printing sand molds suitable for the production of magnesium-aluminum alloys and its preparation and Instructions

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  • Flame retardant as well as preparation method and use method thereof
  • Flame retardant as well as preparation method and use method thereof
  • Flame retardant as well as preparation method and use method thereof

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preparation example Construction

[0025] The second purpose of the present invention is to disclose the preparation method of the above-mentioned flame retardant, which comprises the following steps:

[0026] S1. According to the needs, design the distribution ratio of each component of boron-based flame retardant and / or covering flame retardant, and weigh the raw materials according to the component distribution ratio;

[0027] S2. Place the raw material in a ball mill, and mill it for 1 to 2 hours to obtain fine powder;

[0028] S3. Use each mesh screen to sieve the fine powder to obtain the corresponding mesh fine powder;

[0029] S4. According to needs, design the particle size ratio of the flame retardant, weigh and mix the fine powder of the corresponding mesh number according to the particle size ratio to obtain the flame retardant of the present invention.

[0030] The third object of the present invention is to disclose the use method of the above-mentioned flame retardant, which comprises the follow...

Embodiment 1

[0035] A flame retardant, the composition ratio is 100% potassium fluoroborate, and after ball milling for 1 hour, it is screened with a screen, and the flame retardant disclosed in this embodiment is prepared by remixing according to the particle size ratio. The particle size ratio is specifically:

[0036]

[0037] After measurement, the bulk density of the flame retardant disclosed in this example is 1.55g / cm 3 .

[0038] For the use method of the flame retardant disclosed in this embodiment, 2% by weight of the flame retardant is added to the foundry sand, and the 3D printing method completes the production of the sand mold, and the surface of the sand mold has no cracks and no veins.

[0039] The 3D printing sand mold made of the flame retardant disclosed in this embodiment is used for magnesium-aluminum alloy casting, and there is no combustion phenomenon during the pouring process, and the magnesium-aluminum alloy solution does not react with the sand mold.

Embodiment 2

[0041] A flame retardant, the composition ratio is 40% sodium tetraborate, 30% potassium fluoroborate, 20% ammonium fluoroborate and 10% ammonium phosphate. After ball milling for 1 hour, use a screen to sieve, and remix according to the particle size ratio. The flame retardant disclosed in this embodiment is obtained, and the particle size ratio is specifically:

[0042]

[0043] After measurement, the bulk density of the flame retardant disclosed in this example is 1.55g / cm 3 .

[0044] For the use method of the flame retardant disclosed in this embodiment, 2% by weight of the flame retardant is added to the foundry sand, and the 3D printing method completes the production of the sand mold, and the surface of the sand mold has no cracks and no veins.

[0045] The 3D printing sand mold made of the flame retardant disclosed in this embodiment is used for magnesium-aluminum alloy casting, and there is no combustion phenomenon during the pouring process, and the magnesium-al...

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Abstract

The invention discloses a flame retardant. The flame retardant comprises a boron-based flame retardant and / or a covering-type flame retardant, the particle size of the flame retardant comprises particle size A, particle size B and particle size C, and the weight of the particle size B is not less than 85% of the weight of the flame retardant; the granularity of A is less than 100 meshes, the granularity of B is 100-200 meshes, and the granularity of C is more than 200 meshes. The invention also discloses a preparation method of the flame retardant, which comprises the following steps: placing the boron-based flame retardant and / or the covering type flame retardant in a ball mill for ball milling for 1-2 hours to obtain fine powder, and screening the fine powder; and re-mixing the screened fine powder according to the proportion. The invention further discloses a use method of the flame retardant. The flame retardant is added into sand for casting and is uniformly mixed. The flame retardant disclosed by the invention can be easily and uniformly mixed with casting sand, powder laying is uniform in the sand mold / core 3D printing process, veins are reduced, the high-temperature resistance of a sand mold / sand core is improved, the defects of air holes, choking and the like generated in the casting process of magnesium-aluminum alloy are effectively prevented, and the casting quality is improved.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a flame retardant for 3D printing sand molds and a preparation and use method thereof. Background technique [0002] In the foundry industry, castings produced using sand molds account for more than 80% of the total casting production. Castings produced by traditional methods are generally time-consuming and labor-intensive, with low precision, high energy consumption and low efficiency in the production process. 3D printing technology and its related industries have emerged and flourished. The most widely used 3D printing technology in the casting field is the 3DP technology that uses powder materials for printing. The production process is roughly divided into three steps: droplet spraying, powder particle bonding and solidification molding. ; Repeat the sand laying and bonding layer by layer, and finally realize the solidification and bonding of the overall sand mold / core....

Claims

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Application Information

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IPC IPC(8): B22C1/04B22C5/04B22C5/06B22C9/02B33Y70/10
CPCB22C1/04B22C5/04B22C5/0409B22C5/06B22C9/02B33Y70/10
Inventor 杨伟光王敏严生辉张龙江
Owner NINGXIA KOCEL MOLD
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