Retarder for phosphate cement and application method thereof

A phosphate cement and retarder technology, which is applied in the field of phosphate cement admixtures, can solve problems such as prolonging the setting time of phosphate cement to 10 minutes, phosphate cement is not affected, and the effect of retarder is not very ideal.

Inactive Publication Date: 2016-01-20
湖南同远新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because phosphate cement has the characteristics of extremely fast setting speed, these two problems have not been well resolved, resulting in that phosphate cement has not received enough attention and research for a long time, but it has only been used in road repairs in a limited way. On the cement, its excellent characteristics cannot be brought into play and utilized in a wider range
But the use effect of above-mentioned retarder is not very satisfactory, has some problems, for example, the admixture of borax in phosphate cement is very big, up to more than 15%, and cost is very high; The retarding effect of sodium polyphosphate is unsatisfactory, Adding 4% sodium polyphosphate, the setting time of phosphate cement can only be extended to 10 minutes

Method used

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  • Retarder for phosphate cement and application method thereof
  • Retarder for phosphate cement and application method thereof
  • Retarder for phosphate cement and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The admixture formula is: 3-methyl-3-oxetane methanol accounts for 25%, and tetramethylammonium tetrafluoroborate accounts for 75%.

[0012]

Embodiment 2

[0014] The admixture formula is: 3-methyl-3-oxetane methanol accounts for 45%, and tetramethylammonium tetrafluoroborate accounts for 55%.

[0015]

[0016]

Embodiment 3

[0018] The admixture formula is: 3-methyl-3-oxetane methanol accounts for 35%, and tetramethylammonium tetrafluoroborate accounts for 65%.

[0019]

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Abstract

The invention specifically relates to a composite additive capable of substantially prolonging the setting time of phosphate cement without influencing the strength and durability of the phosphate cement, belonging to the technical field of additives for phosphate cement. The phosphate cement has the characteristic of a fast setting speed; however, problems in application of the phosphate cement have not been overcome so far, so the phosphate cement has not gain enough attention and research for a long time. The composite additive provided by the invention comprises 25 to 45% of 3-methyl-3-oxetanemethanol and 55 to 75% of tetramethylammonium tetrafluoroborate, and the percentages of the above-mentioned components sum to 100%; the doping amount of the additive is 0.8 to 2.0% of the total weight of magnesium oxide and potassium dihydrogen phosphate, setting time can be adjusted by controlling the doping amount; and the additive has the characteristics of a low doping amount, good adjusting effect, low cost, etc.

Description

Technical field: [0001] The invention belongs to the technical field of phosphate cement admixtures, specifically a composite admixture which can significantly prolong the setting time of phosphate cement without affecting its strength and durability. Background technique: [0002] Phosphate cement is prepared by phosphate, retarder and mineral admixture in a certain proportion. Among them, magnesium oxide as one of the raw materials is calcined from magnesium carbonate at high temperature, and the calcining temperature is generally about 1700°C. Phosphate is another important raw material for the production of phosphate cement. It mainly provides hydrogen ions and phosphate ions for the hydration reaction, and its hydration product is mainly struvite. Because the hydration reaction speed of phosphate cement is very fast and the early strength is high, it is especially suitable for rapid repair of projects. In the 1980s, the United States and other western developed countri...

Claims

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Application Information

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IPC IPC(8): C04B24/02C04B103/22
Inventor刘志坚王二强
Owner湖南同远新材料科技有限公司