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Magnesia cement

A magnesia and cement technology, applied in the field of magnesia cement, can solve the problems of whitening of magnesia concrete, difficulty in preservation of powder state, discoloration of magnesia concrete over time, etc., and achieves the effect of excellent preservation.

Inactive Publication Date: 2016-10-12
AKO KASEI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, since magnesium chloride as a raw material has deliquescent properties and magnesium sulfate has weathering properties, it is difficult to store them in a powder state.
Next, when magnesia cement using deliquescent magnesium chloride as a raw material is solidified, the obtained magnesia concrete has problems such as discoloration over time, dew condensation, and a decrease in strength. When magnesia cement solidifies, the obtained magnesia concrete has problems such as whitening, pulverization, and strength reduction over time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] "Example 1"

[0067] Measure and mix 60 parts by weight of magnesium oxide (Ako Kasei Co., Ltd. product name: AM-2 specific surface area: 12m 2 / g), 30 parts by weight of magnesium chloride hexahydrate (trade name manufactured by Ako Chemical Co., Ltd.: Crystalline CS), 10 parts by weight of magnesium sulfate trihydrate (trade name manufactured by Ako Chemical Co., Ltd.: magnesium sulfate MG-3K), About 1 kg of the mixture was sealed in a plastic bag and allowed to stand indoors. (a)-(c) The anhydrous salt conversion weight ratio of each component was 74.1:17.4:8.5.

Embodiment 2

[0068] "Example 2"

[0069] The mixture was left still in the same manner as in Example 1 except that the anhydrous salt conversion weight ratio of each component (a) to (c) was 63.3:14.9:21.8.

Embodiment 3

[0070] "Example 3"

[0071] The magnesium sulfate trihydrate was replaced by the tetrahydrate prepared above, and the anhydrous salt conversion weight ratio of each component (a) to (c) was set to 64.7:15.1:20.2, except that it was the same as Example 1. Set the mixture.

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Abstract

The invention provides magnesia cement that has an excellent storage property and is cured to become magnesia concrete having excellent stability. The magnesia cement at least comprises (a) magnesium oxide, (b) at least one of mono- to hexa-hydrates of magnesium chloride, and (c) at least one of mono- to hepta-hydrates of magnesium sulfate. When (b) magnesium chloride includes mono-hydrate or hepta-hydrate, (c) magnesium sulfate is not hepta-hydrate.

Description

technical field [0001] The present invention relates to magnesium oxide cement. Background technique [0002] Magnesia cement is known which consists of two components of either magnesium chloride or magnesium sulfate and magnesium oxide (see Patent Documents 1 and 2). Magnesia cement has preferable characteristics such as fast curing speed and high molded body strength compared with ordinary portland cement, but it has not been widely used. This is because there are problems in storage stability and stability after curing. That is, since magnesium chloride as a raw material has deliquescent properties and magnesium sulfate has weathering properties, it is difficult to store them in a powder state. Next, when magnesia cement using deliquescent magnesium chloride as a raw material is solidified, the obtained magnesia concrete has problems such as discoloration over time, dew condensation, and a decrease in strength. When the magnesia cement is solidified, the resulting mag...

Claims

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Application Information

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IPC IPC(8): C04B9/04C04B9/02
CPCC04B9/02C04B9/04
Inventor 桥本千明小野敬义
Owner AKO KASEI CO LTD
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