Magnesium oxychloride cement additive for 3D printing and application thereof

A magnesium oxychloride cement and 3D printing technology, applied in the field of building materials, can solve the problems of lack of fresh magnesium oxychloride cement slurry cooling, low overall carbonation degree, etc., to improve the early microstructure and macroscopic performance, and solve the cooling technology Difficulty, effect of promoting exothermic reaction

Active Publication Date: 2021-10-29
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a magnesium oxychloride cement additive material for 3D printing and its application to at least solve the lack of magnesium oxychloride cement fresh slurry cooling in the prior art, low-temperature carbonization technology below freezing point, low overall carbonization degree, 3D Printing Technical Issues for Industrial Applications

Method used

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  • Magnesium oxychloride cement additive for 3D printing and application thereof
  • Magnesium oxychloride cement additive for 3D printing and application thereof
  • Magnesium oxychloride cement additive for 3D printing and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Example 1 The magnesium oxychloride cement additive for 3D printing, the ratio and test results of the magnesium oxychloride cement additive are shown in Table 1.

[0047] Table 1 Magnesium oxychloride cement additive ratio, test table 1

[0048]

[0049]Among them, the light-burned magnesia is an industrial-grade raw material, the content of magnesia is 97.2%, the content of active magnesia is 76.0%, the average particle size is 118nm, and the specific surface area is 51m 2 / g; the magnesium chloride hexahydrate is an industrial-grade raw material, the fineness is 48 μm, and the content of magnesium chloride hexahydrate is 44%; the anhydrous citric acid is chemically pure; the dry ice is rice grain-shaped, and the length is 5mm.

Embodiment 2

[0050] Example 2 Magnesium oxychloride cement additive for 3D printing, the ratio and test results of the magnesium oxychloride cement additive are shown in Table 2.

[0051] Table 2 Magnesium oxychloride cement additive ratio, test table 2

[0052]

[0053] Among them, the light-burned magnesia is an industrial-grade raw material, the content of magnesia is 97.2%, the content of active magnesia is 76.0%, the average particle size is 118nm, and the specific surface area is 51m 2 / g; the magnesium chloride hexahydrate is an industrial-grade raw material with a fineness of 75 μm, and the content of magnesium chloride hexahydrate is 46%; the anhydrous sodium carbonate is pure for chemical analysis; the dry ice is rice-shaped and has a length of 15 mm.

Embodiment 3

[0054] Example 3 Magnesium oxychloride cement additive for 3D printing, the ratio and test of the magnesium oxychloride cement additive are shown in Table 3.

[0055] Table 3 Magnesium Oxychloride Cement Additive Ratio, Test Table 3

[0056]

[0057] The light-burned magnesia content is 93.8%, the active magnesia content is 66.2%, the average particle diameter is 190nm, and the specific surface area is 32m 2 / g; the magnesium chloride hexahydrate is an industrial-grade raw material with a fineness of 55 μm, and the content of magnesium chloride hexahydrate is 45%; the borax is pure for chemical analysis; the dry ice is rice-shaped and has a length of 10 mm.

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Abstract

The invention discloses a magnesium oxychloride cement additive for 3D printing and an application thereof. The magnesium oxychloride cement is prepared from the following raw materials in parts by weight: 100 parts of light calcined magnesia, 122.4-150.0 parts of magnesium chloride hexahydrate, 0-6.5 parts of an additive, 0-20 parts of dry ice and 40-73 parts of water, according to the method, dry ice is added into the magnesium oxychloride cement fresh mixed paste, so that the technical problem of cooling of the magnesium oxychloride cement fresh mixed paste is solved, carbon dioxide generated by the dry ice promotes an exothermic reaction of the magnesium oxychloride cement, the carbonization degree of a hydration product is improved, and the early microstructure and macroscopic performance of the magnesium oxychloride cement additive are effectively improved; the temperature of the curing environment is kept consistent with that of the magnesium oxychloride cement additive through a temperature control carbonization chamber, so that microdefects and microcracks caused by temperature stress in the hydration process of the magnesium oxychloride cement additive are effectively reduced; the magnesium oxychloride cement additive is used for 3D printing, the industrialization level of the magnesium oxychloride cement is improved, and engineering application of the magnesium oxychloride cement is promoted.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a magnesium oxychloride cement additive for 3D printing and its application. Background technique [0002] Magnesium oxychloride cement has the characteristics of rapid hardening and early strength, and the firing temperature of light-burned magnesia, one of its main raw materials, is generally around 700°C, which is significantly lower than the firing temperature of Portland cement at 1450°C. Therefore, magnesium oxychloride cement is a low-carbon green cement with low energy consumption and has a good development prospect. Magnesium oxychloride cement has problems such as the release of a large amount of heat during the hydration process, and the carbonization reaction of magnesium hydroxide, one of the hydration products, with carbon dioxide in the air; it needs to use cooling equipment for cooling treatment, but the freshly mixed slurry The body needs to be mixe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/32C04B40/02B33Y70/10B33Y30/00B28B1/00
CPCC04B28/32C04B40/0231B33Y70/10B33Y30/00B28B1/001C04B2111/00181C04B2201/50C04B22/06C04B24/06C04B22/10C04B22/0013C04B24/04Y02W30/91
Inventor 寇世聪罗富明崔棚
Owner SHENZHEN UNIV
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