Magnesium phosphate cement containing C7A5M minerals and preparation method thereof

A magnesium phosphate cement, C7A5M15 technology, applied in the field of building materials, can solve problems such as poor water resistance, achieve the effects of improving mechanical properties, reducing preparation costs, and solving water resistance

Active Publication Date: 2021-12-31
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a 7 A 5 The magnesium phosphate cement of M minerals and its preparation method reduce the content of magnesium oxide in traditional magnesium phosphate cement, adjust the composition of hydration products of magnesium phosphate cement, endow magnesium phosphate cement with good hydration hardening performance and solve the problems of poor water resistance and the like.

Method used

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  • Magnesium phosphate cement containing C7A5M minerals and preparation method thereof

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Effect test

Embodiment 1

[0032] a C 7 A 5 Magnesium phosphate cement of M minerals, the principal components of which are by weight: C 7 A 5 35 parts of M, 40 parts of dead burnt MgO, NH 4 h 2 PO 4 18 parts, 7 parts of borax; Its preparation process mainly comprises the following steps:

[0033] (1) C7 A 5 M raw meal preparation according to C 7 A 5 The stoichiometry of M weighs the calcareous component, the magnesium component and the aluminum-containing component and mixes and homogenizes;

[0034] (2) Calcinate the above-mentioned raw meal at 1300°C for 20min~3h, take it out and cool it naturally, and then carry out grinding treatment, and the upper limit of the fineness is controlled at 75 μm.

[0035] (3) The ground C 7 A 5 M was prepared with commercially available dead-burned MgO, phosphate, and borax according to the component ratio of 35:40:18:7 to obtain the final magnesium phosphate cement.

Embodiment 2

[0037] a C 7 A 5 Magnesium phosphate cement of M minerals, the principal components of which are by weight: C 7 A 5 20 parts of M, 48 parts of MgO, 22 parts of ammonium dihydrogen phosphate, and 7 parts of borax; including 3 parts of boron oxide for the synergistic preparation of C 7 A 5 Introduced when M -MgO;

[0038] The preparation of magnesium phosphate cement mainly includes the following steps:

[0039] (1) C 7 A 5 Preparation of M-MgO raw meal according to C 7 A 5 The ratio of M to MgO and C 7 A 5 The stoichiometry of M weighs dolomite, magnesite, bauxite and boron oxide, grinds and homogenizes, and controls the fineness below 75 μm.

[0040] (2) Calcinate the homogenized raw meal at 1400°C for 20min~3h, take it out and cool it naturally to obtain C 7 A 5 Mixture of M-MgO.

[0041] (3) Take the sintered product after rapid cooling in step (2), and perform grinding treatment, and the fineness is controlled below 75 μm.

[0042] (4) put C 7 A 5 The M-MgO...

Embodiment 3

[0044] a C 7 A 5 Magnesium phosphate cement of M, the main components of which are by weight: 42 parts C 7 A 5 M, 30 parts of MgO, 20 parts of ammonium dihydrogen phosphate, 8 parts of borax mainly include the following steps:

[0045] (1) C 7 A 5 Preparation of M-MgO raw meal according to C 7 A 5 M:MgO:B 2 o 3 The ratio is 58:42, and according to the oxide composition of dolomite, magnesite and aluminum ash, the above raw materials are accurately weighed.

[0046] (2) Take the homogenized precursor in step (1), calcinate it at 1350°C for 20min~3h, take it out and cool it naturally to get C 7 A 5 Mixture of M-MgO.

[0047] (3) Take the sintered product after rapid cooling in step (2), and perform grinding treatment, and the fineness is controlled below 75 μm.

[0048] (4) put C 7 A 5 The M-MgO mixture is prepared with phosphate and borax in a ratio of 72:20:8 to obtain the final magnesium phosphate cement.

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Abstract

The invention discloses magnesium phosphate cement containing C7A5M minerals and a preparation method. The magnesium phosphate cement is prepared from the following raw materials in parts by weight: 15 to 40 parts of C7A5M, 30 to 50 parts of MgO, 15 to 20 parts of phosphate and 2 to 10 parts of boron-containing substances. According to the invention, the composition range of the final mineral phase of the magnesium phosphate cement is provided, and the C7A5M mineral phase can be separately fired at high temperature and compounded with commercially available magnesium oxide; or the mixed ore phase of C7A5M and MgO can be firstly fired at high temperature, and then is compounded with corresponding phosphate and boron-containing substances to prepare the magnesium phosphate cement containing C7A5M minerals. The composition mode of an original hydration product is changed according to the component range provided by the invention, a novel hydration product is formed, the magnesium phosphate cement is endowed with excellent hydration hardening performance, and the water resistance is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a C-containing 7 A 5 Magnesium phosphate cement of M minerals and its preparation method. Background technique [0002] Magnesium phosphate cement is mainly composed of dead-burned magnesia, phosphate components, and retarder components, of which the proportion of dead-burned magnesia and phosphate is usually between 85% and 95%. The types of phosphates are ammonium dihydrogen phosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate, etc., one or both of which are feasible. The strength development of magnesium phosphate cement has a certain relationship with the type of phosphate. Generally speaking, the strength of magnesium phosphate cement prepared with ammonium dihydrogen phosphate is relatively high. The retarding component is usually borax, boric acid or composite retarder with borax as the main component. Phosphate and borax are chemical indus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B12/02
CPCC04B12/02
Inventor 孙化强汤凡雄
Owner FUZHOU UNIV
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