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Composite potassium magnesium phosphate cement

A potassium magnesium phosphate cement and sodium tripolyphosphate technology, applied in the field of cement, can solve the problems of large hydration heat release, easy formation of cracks, high thermal expansion coefficient, etc., achieve less cracks and defects, improve shrinkage performance, and compact crystal packing Effect

Inactive Publication Date: 2016-02-10
李干
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the thermal expansion coefficient of the prior art potassium magnesium phosphate cement is high, and the heat of hydration is large at the same time, and cracks are easily formed after the cement is solidified.

Method used

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  • Composite potassium magnesium phosphate cement
  • Composite potassium magnesium phosphate cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A composite magnesium potassium phosphate cement comprising 34% KH 2 PO 4 , 49%MgO, 7.2%Al (H 2 PO 4 ) 3 , 4.9% glass fiber, 1% sodium dodecylbenzene sulfonate, 1.2% phosphate monoester coupling agent, 0.4% sodium tripolyphosphate and 1.3% sodium ethylenediamine tetramethylene phosphonate.

Embodiment 2

[0036] A composite magnesium potassium phosphate cement comprising 40% KH 2 PO 4 , 43%MgO, 8.8%Al (H 2 PO 4 ) 3 , 3.3% glass fiber, 1.8% sodium dodecylbenzene sulfonate, 0.4% phosphate monoester coupling agent, 0.8% sodium tripolyphosphate and 0.9% sodium ethylenediamine tetramethylene phosphonate.

[0037] The particle size of the magnesium oxide particles is 86 μm, and the specific surface area of ​​the magnesium oxide particles is 1737 cm 2 / g.

[0038] The particle size of the potassium dihydrogen phosphate particles is 130 μm, and the specific surface area of ​​the potassium dihydrogen phosphate is 2110 cm 2 / g.

[0039] The particle size of the aluminum dihydrogen phosphate particles is 90 μm, and the specific surface area of ​​the aluminum dihydrogen phosphate is 2320 cm 2 / g.

Embodiment 3

[0041] A composite magnesium potassium phosphate cement comprising 37% KH 2 PO 4 , 46%MgO, 9%Al (H 2 PO 4 ) 3 , 4.1% glass fiber, 1.4% sodium dodecylbenzene sulfonate, 0.8% phosphate monoester coupling agent, 0.6% sodium tripolyphosphate and 1.1% sodium ethylenediamine tetramethylene phosphonate.

[0042] The particle size of the magnesium oxide particles is 86 μm, and the specific surface area of ​​the magnesium oxide particles is 1737 cm 2 / g.

[0043] The particle size of the potassium dihydrogen phosphate particles is 130 μm, and the specific surface area of ​​the potassium dihydrogen phosphate is 2110 cm 2 / g.

[0044]The particle size of the aluminum dihydrogen phosphate particles is 90 μm, and the specific surface area of ​​the aluminum dihydrogen phosphate is 2320 cm 2 / g.

[0045] Glass fiber as nano TiO 2 / micron composite glass fiber, nano / micron TiO 2 Glass fibers are layered, including TiO 2 Porous coating formed on glass fiber surface, TiO 2 The parti...

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Abstract

The invention discloses composite potassium magnesium phosphate cement, and belongs to the field of cement. The composite potassium magnesium phosphate cement comprises the following components: 34-40% of KH2PO4, 43-49% of MgO, 7.2-8.8% of Al (H2PO4)3, 3.3-4.9% of glass fiber, 1-1.8% of sodium dodecyl benzene sulfonate, 0.4-1.2% of a phosphomonoester coupling agent, 0.4-0.8% of sodium tripolyphosphate and 0.9-1.3% of ethylene diamine tetra (methylene phosphonic acid) sodium. The composite potassium magnesium phosphate cement disclosed by the invention has the characteristic of few crack, i.e., cracks can be reduced after the cement is cured.

Description

technical field [0001] The invention relates to a cement, in particular to a composite potassium magnesium phosphate cement. Background technique [0002] Potassium magnesium phosphate cement is made of dead-burned magnesia and soluble phosphate, chemical additives and mineral admixtures in a certain proportion, under acidic conditions through acid-base chemical reaction and physical action to form an inorganic glue with phosphate as the binding phase. condensate material. This type of material is combined by chemical bonds at room temperature, and has the main characteristics of silicate cementitious materials and ceramic materials, namely low-temperature curing, high early strength, high volume stability, strong adhesion, neutral hardening and Good durability etc. [0003] However, the thermal expansion coefficient of magnesium potassium phosphate cement in the prior art is high, and the heat of hydration is large at the same time, and cracks are easily formed after the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B12/02
Inventor 李乾
Owner 李干
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