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A kind of early strong basic magnesium sulfate cement and preparation method thereof

A magnesium sulfate, basic technology, applied in the field of inorganic cementitious materials, can solve the problems of low early strength, drying shrinkage cracking, affecting product production efficiency, etc.

Active Publication Date: 2019-12-13
开平市赤牛水泥制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The conventional preparation method of basic magnesium sulfate cement directly mixes magnesium sulfate solution, magnesium oxide and admixture, and its early strength is very low, which not only affects the production efficiency of its products, but also has low tensile strength due to low early strength. , so prone to shrinkage and cracking

Method used

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preparation example Construction

[0018] The invention provides a kind of preparation method of early strength basic magnesium sulfate cement, comprises the following steps:

[0019] (1) mixing the first active magnesium oxide, the dispersant, the first admixture and an aqueous solution of magnesium sulfate to obtain an emulsion;

[0020] (2) After mixing the emulsion, the second active magnesium oxide and the second admixture, hardening occurs to obtain early-strength basic magnesium sulfate cement.

[0021] In the present invention, the mass ratio of the first active magnesium oxide to the second active magnesium oxide is preferably (1-10): (100-1000), more preferably (2-5): (150-800), More preferably (2-5): (200-750); the mass ratio of the first admixture to the second admixture is preferably (0.01-0.5): (0.05-10), more preferably (0.1-0.35 ): (0.1-9), more preferably (0.2-0.3): (0.5-8).

[0022] Unless otherwise specified, the raw materials for the preparation of the early-strength basic magnesium sulfat...

Embodiment 1

[0039] Preparation of early-strength basic magnesium sulfate cement includes as follows:

[0040] (1) Mix 1 part of activated magnesium oxide, 100 parts of magnesium sulfate aqueous solution with a mass concentration of 25 wt.%, 0.01 part of polyethylene glycol, and 0.01 part of ethylenediaminetetraacetic acid, and magnetically stir for 24 hours to obtain an emulsion;

[0041] (2) The above emulsion was mixed with 99 parts of magnesium oxide and 1 part of phosphoric acid, and then left to stand at room temperature for curing to harden to obtain early-strength basic magnesium sulfate cement. The compressive strength was tested 12h, 24h, and 28d after mixing, and the test results were 12MPa, 30MPa, and 71MPa respectively.

Embodiment 2

[0043] Preparation of early-strength basic magnesium sulfate cement includes as follows:

[0044] (1) Mix 1 part of activated magnesium oxide, 120 parts of 25 wt.% magnesium sulfate aqueous solution, 0.01 part of polydodecylbenzene sodium sulfonate, 0.02 part of phosphoric acid, and magnetically stir for 24 hours to obtain an emulsion;

[0045] (2) The above emulsion was mixed with 99 parts of magnesium oxide and 1 part of phosphoric acid, and then left to stand at room temperature for curing to harden to obtain early-strength basic magnesium sulfate cement. The compressive strength was tested 12h, 24h, and 28d after mixing, and the test results were 9MPa, 25MPa, and 63MPa, respectively.

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Abstract

The invention provides high-early-strength basic magnesium sulfate cement and a preparation method thereof. The preparation method includes: mixing first active magnesium oxide, a dispersing agent, afirst additive and magnesium sulfate aqueous solution to obtain emulsion; mixing the emulsion with second active magnesium oxide and a second additive, and hardening to obtain the high-early-strengthbasic magnesium sulfate cement. By adoption of the preparation method, the high-early-strength basic magnesium sulfate cement can be prepared, and product production efficiency can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of inorganic gelling materials, in particular to an early-strength basic magnesium sulfate cement and a preparation method thereof. Background technique [0002] Basic magnesium sulfate cement is a new type of air-hardening magnesia cementitious material developed after magnesium oxychloride cement and magnesium oxysulfide cement. gelling material. Similar to magnesium oxysulfate cement, basic magnesium sulfate cement also belongs to MgO-MgSO 4 -H 2 O ternary system, the difference is that due to the addition of additives, its hydration products have undergone fundamental changes. [0003] The conventional preparation method of basic magnesium sulfate cement directly mixes magnesium sulfate solution, magnesium oxide and admixture, and its early strength is very low, which not only affects the production efficiency of its products, but also has low tensile strength due to low early strength. , thus prone ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B9/04
CPCC04B9/04
Inventor 吴成友余红发黄磊陈远基陈聪
Owner 开平市赤牛水泥制品有限公司
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