A kind of magnesium oxysulfide cement and preparation method thereof

A technology of magnesium oxysulfide cement and magnesium sulfate, which is applied in the field of building materials to achieve the effects of improving production efficiency, increasing the speed of setting and hardening, and setting fast

Active Publication Date: 2019-07-23
QINGHAI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as pointed out in an article "Modification Effect of Citric Acid on Magnesium Oxygen Sulfate Cement" in the fourth issue of Volume 36 of the Journal of Hefei University of Technology, although citric acid improves its mechanical strength, it greatly delays its setting time.

Method used

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  • A kind of magnesium oxysulfide cement and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0023] The magnesium oxide content of light magnesia is 95.5%.

[0024] Mix 100 parts by mass of light magnesium oxide, 1 part by mass of formic acid and 240 parts by mass of magnesium sulfate with a mass percentage of 25%, harden for 7 days, grind and dry at 80°C for 12 hours to obtain basic magnesium sulfate Precursor.

[0025] 100 mass parts of light-burned magnesium oxide powder, 50 mass parts of magnesium sulfate heptahydrate, 1 mass part of phosphorus pentoxide, and 1 mass part of the basic magnesium sulfate precursor are mixed and ground through a 100-mesh sieve to obtain rapid hardening sulfur Magnesia cement.

Embodiment 2

[0027] The magnesium oxide content of light magnesia is 95.5%.

[0028] Mix 100 parts by mass of light magnesium oxide, 1 part by mass of formic acid and 240 parts by mass of magnesium sulfate with a mass percentage of 25%, harden for 1 day, grind and dry at 60°C for 24 hours to obtain basic sulfur oxide Magnesium cement precursor.

[0029] 100 parts by mass of light-burned magnesium oxide powder, 100 parts by mass of magnesium sulfate heptahydrate, 2 parts by mass of sodium formate, and 0.5 parts by mass of basic magnesium sulfate precursor were mixed and ground through a 100-mesh sieve to obtain rapid hardening magnesium oxysulfide cement.

Embodiment 3

[0031] The magnesium oxide content of light magnesia is 95.5%.

[0032] Mix 50 parts by mass of light magnesium oxide, 0.1 part by mass of formic acid and 240 parts by mass of magnesium sulfate with a mass percentage of 25%, harden for 3 days, grind and dry at 70°C for 16 hours to obtain basic sulfur oxide Magnesium cement precursor.

[0033] 50 parts by mass of light-burned magnesium oxide powder, 50 parts by mass of magnesium sulfate heptahydrate, 1 part by mass of sodium formate, and 1 part by mass of basic magnesium sulfate precursor were mixed and ground through a 100-mesh sieve to obtain rapid hardening magnesium oxysulfide cement.

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Abstract

The invention discloses magnesium oxysulfate cement and a preparation method thereof. The preparation method comprises the following steps: mixing and grinding 50 to 100 parts by mass of active magnesium oxide powder, 30 to 100 parts by mass of crystalline magnesium sulfate or anhydrous magnesium sulfate, 0.5 to 2 parts by mass of an additive and 0.5 to 10 parts by mass of a basic magnesium sulfate precursor and then carrying sieving with a 100-to-200-mesh screen so as to obtain the rapid-hardening magnesium oxysulfate cement. According to the invention, the speed of setting and hardening is substantially increased, and production efficiency of the magnesium oxysulfate cement can be improved.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a magnesium oxysulfide cement and a preparation method thereof. Background technique [0002] Magnesium oxysulfate cement belongs to an air-hardening magnesia material, which is usually an inorganic gelling material produced by mixing magnesium oxide and magnesium sulfate solution. [0003] Compared with ordinary portland cement, magnesium oxysulfate cement has the characteristics of light weight and good decorative performance. However, magnesium oxysulfide cement without any admixture is prone to cracking and low strength. Therefore, the research on the modification of magnesium oxysulfide cement in recent years is how to improve its mechanical strength. Chinese patent application 200510048574.7 discloses a magnesium sulfate lime cement, which essentially adds citric acid to the magnesium sulfate cement system. However, as pointed out in the "Modification Effect of Citric A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B9/04C04B9/20
CPCC04B9/04C04B9/20
Inventor 吴成友余红发
Owner QINGHAI UNIVERSITY
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