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Phosphorus-containing magnesium oxychloride cement preparation method beneficial to improvement of early strength

A magnesium oxychloride and early strength technology, which is applied in the field of preparation of phosphorus-containing magnesium oxychloride cement, can solve the problems of low early strength, slow setting speed, and speed up the early hydration and crystallization speed of magnesium oxychloride cement, so as to improve the early strength , the effect of increasing the speed and yield, reducing the nucleation barrier

Active Publication Date: 2017-03-22
CHANGZHOU UNIV
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AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem of slow setting speed and low early strength of magnesium oxychloride cement in the prior art, especially the water-resistant magnesium oxychloride cement containing phosphoric acid or soluble phosphate, and provides a phosphorus-chloride cement that is beneficial to the improvement of early strength. The preparation method of magnesium oxide cement: by adding seeds to the magnesium oxychloride cement system, the early hydration and crystallization speed of magnesium oxychloride cement is accelerated, and the main strength phase 5-phase crystal "5Mg(OH) is promoted. 2 · MgCl 2 ·8H 2 The formation of O", the 5-phase crystal is a needle-like crystal, which interweaves and interpenetrates in the magnesium oxychloride cement system to provide strength, thereby improving the early strength of the magnesium oxychloride cement.

Method used

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  • Phosphorus-containing magnesium oxychloride cement preparation method beneficial to improvement of early strength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Calcining basic magnesium carbonate at 600°C for 2 hours to obtain high-activity magnesium oxide powder, mix the magnesium oxide powder with magnesium chloride and water in a molar ratio of 0.32:1:13 and put it into a hydrothermal reaction kettle for 80 React at ℃ for 3 days, after cooling, filter with suction, wash with absolute ethanol, dry in an oven at 45℃ and dry to obtain seed crystal powder;

[0019] (2) The mass content of active magnesium oxide in the light-burned magnesium oxide powder used in the present embodiment is 63%, and the mass content of magnesium oxide is 84.27%,

[0020] According to MgO, magnesium chloride, the molar ratio of water is 6:1:13, the consumption of anti-water agent phosphoric acid is 1% of MgO quality, the consumption of seed crystal is 1% of MgO quality, the crystal that obtains in the step (1) is first Seed and the above-mentioned light-burned magnesia powder are mixed evenly, and magnesium chloride is dissolved in water and pho...

Embodiment 2

[0022] (1) The preparation of seed crystal powder is the same as in Example 1;

[0023] (2) According to MgO, magnesium chloride, the mol ratio of water is 6:1:15, the consumption of anti-water agent sodium dihydrogen phosphate is 1% of MgO quality, and the consumption of crystal seed is 1% of MgO quality, step ( 1) The seed crystal obtained in and the same light-burned magnesia powder as in Example 1 were mixed uniformly, magnesium chloride was dissolved in water and sodium dihydrogen phosphate was added to mix uniformly, and finally the mixed powder and solution were mixed and stirred uniformly to prepare Form magnesium oxychloride cement slurry, inject this magnesium oxychloride cement slurry into the stainless steel mold of 40mm * 40mm * 160mm, demould curing after 1 day, the compressive strength when curing in air for 3 days is 75MPa; And here During the process, it was detected that the free magnesium chloride in the system was greatly reduced, which also confirmed that ...

Embodiment 3

[0025] (1) The preparation of seed crystal powder is the same as in Example 1;

[0026] (2) According to MgO, magnesium chloride, the mol ratio of water is 7:1:15, the consumption of anti-water agent ammonium dihydrogen phosphate is 1% of MgO quality, and the consumption of crystal seed is 1% of MgO quality, step ( 1) The seed crystal obtained in and the same light-burned magnesia powder as in Example 1 were mixed uniformly, magnesium chloride was dissolved in water and ammonium dihydrogen phosphate was added to mix uniformly, and finally the mixed powder and solution were mixed and stirred uniformly to prepare Form magnesium oxychloride cement slurry, inject this magnesium oxychloride cement slurry into the stainless steel mold of 40mm * 40mm * 160mm, demould curing after 1 day, the compressive strength when curing in air for 3 days is 68MPa; And here During the process, it was detected that the free magnesium chloride in the system was greatly reduced, which also confirmed t...

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Abstract

The invention belongs to the technical field of modification of magnesium oxychloride cement and particularly relates to a phosphorus-containing magnesium oxychloride cement preparation method beneficial to improvement of early strength. The method comprises the steps that firstly, active magnesium oxide, magnesium chloride and water are evenly mixed in the mole ratio being 0.32:1:13, the mixture reacts for 3 days at 80 DEG C, cooling, suction filtration and washing are conducted, and drying is conducted to obtain seed crystals; and then the seed crystals, a phosphorus-containing water repellent agent, magnesium chloride, light calcined magnesium oxide powder and water are mixed, and the magnesium oxychloride cement is prepared. With the method, the seed crystals are added to a magnesium oxychloride cement system, the five-phase production speed and yield can be substantially increased, and the early strength of the cement is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of modification of magnesium oxychloride cement, and in particular relates to a preparation method of phosphorus-containing magnesium oxychloride cement which is beneficial to improving early strength. Background technique [0002] With the development of social economy, the requirements for energy saving and environmental protection are getting higher and higher. After the World Health Organization announced that asbestos is the first carcinogen on the list, asbestos and asbestos-containing plates are gradually banned from use in construction projects. In addition, my country's forest coverage rate is far lower than the world's average level, and the problem of wood consumption is not optimistic. At the same time, if many by-products and wastes of industrial production cannot be properly treated, they will also cause waste of materials and may lead to environmental problems. , such as power plant waste fly as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B9/02C04B9/20
CPCC04B9/02C04B9/20
Inventor 陈若愚张旭王红宁钟璟刘小华
Owner CHANGZHOU UNIV
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