Hardening-time-controllable magnesium oxysulfate cement and preparation method of hardening-time-controllable magnesium oxysulfate cement plate

A technology of magnesium oxysulfide cement and hardening time, applied in the field of building materials, can solve the problems of slow curing time, low mechanical strength, unfavorable construction operations, etc., and achieve the effect of not returning to halogen and improving production efficiency

Inactive Publication Date: 2017-12-22
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unmodified magnesium oxysulfide cement, because its mechanical strength is much lower than that of magnesium oxychloride cement, limits its popularization and application
[0003] The production of architectural decorative panels with magnesium oxysulfate cement as the main raw material requires a reasonable curing time. If the curing time is too fast, it is not conducive to construction operations, and if the curing time is too slow, it is not conducive to the turnover of molds and the improvement of production efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The raw materials are weighed according to the following weight ratios: 40 parts of activated magnesium oxide, 50 parts of magnesium sulfate, 1.2 parts of modifier, 7 parts of light perlite, 20 parts of water, 13 parts of hemihydrate gypsum, and 9 parts of citric acid. Lay the transfer film on the glass plate, weigh various raw materials according to the proportion, first dissolve magnesium sulfate in water, control the Baume degree at 20°C to 27, and then mix it with other weighed raw materials to form a slurry and pour it into On the transfer film, spread out, the thickness is about 10 mm. The initial setting time is 27 minutes and the final setting time is 60 minutes. The modifier is prepared by mixing sodium gluconate and sodium methyl silicate in a mass ratio of 70:30. The prepared decorative plate has no deformation, cracking and halogen reversion.

Embodiment 2

[0022] The raw materials are weighed according to the following weight ratios: 40 parts of activated magnesium oxide, 50 parts of magnesium sulfate, 1 part of modifier, 7 parts of light perlite, 20 parts of water, 15 parts of hemihydrate gypsum, and 8 parts of citric acid. Lay the transfer film on the glass plate, weigh various raw materials according to the proportion, first dissolve magnesium sulfate in water, control the Baume degree at 20°C to 27, and then mix it with other weighed raw materials to form a slurry and pour it into On the transfer film, spread out, the thickness is about 10mm. The initial setting time is 12 minutes and the final setting time is 45 minutes. The modifier is prepared by mixing sodium gluconate and sodium methyl silicate in a mass ratio of 80:20. The prepared decorative plate has no deformation, cracking and halogen reversion.

Embodiment 3

[0024] The raw materials are weighed according to the following weight ratios: 40 parts of activated magnesium oxide, 50 parts of magnesium sulfate, 0.7 parts of modifier, 7 parts of light perlite, 20 parts of water, 18 parts of hemihydrate gypsum, and 6 parts of citric acid. Lay the transfer film on the glass plate, weigh various raw materials according to the proportion, first dissolve magnesium sulfate in water, control the Baume degree at 20°C to 27, and then mix it with other weighed raw materials to form a slurry and pour it into On the transfer film, spread out, the thickness is about 10mm. The initial setting time is 8 minutes and the final setting time is 30 minutes. The modifier is prepared by mixing sodium gluconate and sodium methyl silicate in a mass ratio of 75:25. The prepared decorative plate has no deformation, cracking and halogen reversion.

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PUM

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Abstract

The invention relates to hardening-time-controllable magnesium oxysulfate cement and a preparation method of a hardening-time-controllable magnesium oxysulfate cement plate. The cement is prepared from the following raw materials in parts by weight: 30 to 60 parts of active magnesia, 30 to 70 parts of magnesium sulfate, 0.5 to 2 parts of modifying agents, 5 to 10 parts of light perlite, 10 to 20 parts of hemihydrate gypsum and 5 to 10 parts of citric acid. A transfer film is laid on a glass plate; cement and water are weighed; the magnesium sulfate is firstly dissolved into water; then, the magnesium sulfate is uniformly mixed with other raw materials to form material slurry; the material slurry is poured onto the transfer film; flat spreading is performed; the maintenance is performed for 15 to 30 hours at the normal temperature; demoulding is performed; the transfer film is removed; a finished product is obtained. The prepared decoration plate does not deform, does not crack and does not generate halogenide; the initial setting time can be controlled to be longer than 30 minutes; the final setting time is controlled to be within 1 hour.

Description

technical field [0001] The invention relates to a magnesium oxysulfide cement, in particular to a magnesium oxysulfide cement with controllable hardening time and a preparation method for a board thereof, which belongs to the technical field of building materials. Background technique [0002] Magnesium oxysulfide cement is an inorganic gelling material prepared by mixing magnesium sulfate solution with light-burned magnesium oxide (MgO) powder. Both magnesium oxysulfide cement and magnesium oxychloride cement can be called magnesium cement, which has the characteristics of light weight, fire prevention, fast setting, sound insulation, and heat insulation. Compared with magnesium oxychloride cement, magnesium oxysulfide cement has the main advantages of good temperature resistance and poor corrosion resistance to steel bars. Unmodified magnesium oxysulfide cement, because its mechanical strength is much lower than that of magnesium oxychloride cement, limits its popularizat...

Claims

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Application Information

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IPC IPC(8): C04B9/06C04B28/30
Inventor 张丰庆田清波岳雪涛徐丽娜陆希峰
Owner SHANDONG JIANZHU UNIV
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