Modified magnesium phosphate cement and preparing method thereof

A magnesium phosphate cement and modification technology, which is applied in the field of structural repair and reinforcement, and building materials, can solve the problems of low strength increase rate in the later stage and short setting time of magnesium phosphate cement.

Active Publication Date: 2016-07-06
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: Aiming at the problems of short setting time of magnesium phosphate cement and low strength increase rate in the later stage, a modified magnesium phosphate cement is announced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034] A kind of preparation of modified magnesium phosphate cement, comprise main component and auxiliary component, measure as follows in mass percentage:

[0035] (1) Main components

[0036] (1) Magnesium phosphate cement: 70%;

[0037] (2) Phosphogypsum: 10%;

[0038] (3) Fly ash: 20%

[0039] (2) Auxiliary components (percentage of the sum of the mass of the main components)

[0040] (1) etherified alcohol modifier: 1%;

[0041] (2) retarder: 3%;

[0042] (3) Water retaining agent: 1%;

[0043] According to the magnesium phosphate cement prepared by the method, the preparation steps are as follows:

[0044] ① Weighing: According to the mass ratio of each component, accurately weigh each component, the total amount is controlled at 5kg, and add the etherified alcohol modifier in the auxiliary component.

[0045] ② Grinding: Put the material obtained in step ① into a ball mill for grinding to obtain a specific surface area of ​​500m 2 / kg mixture.

[0046] ③ Mixin...

example 2

[0048] A kind of preparation of modified magnesium phosphate cement, comprise main component and auxiliary component, measure as follows in mass percentage:

[0049] (1) Main components

[0050] (1) Magnesium phosphate cement: 85%;

[0051] (2) Phosphogypsum: 5%;

[0052] (3) Fly ash: 10%

[0053] (2) Auxiliary components (percentage of the sum of the mass of the main components)

[0054] (1) etherified alcohol modifier: 5%;

[0055] (2) retarder: 5%;

[0056] (3) Water retaining agent: 3%;

[0057] According to the magnesium phosphate cement prepared by the method, the preparation steps are as follows:

[0058] ① Weighing: According to the mass ratio of each component, accurately weigh each component, and add the etherified alcohol modifier in the auxiliary component.

[0059] ② Grinding: Put the material obtained in step ① into a ball mill for grinding to obtain a specific surface area of ​​600m 2 / kg mixture.

[0060] ③ Mixing: Put the mixture obtained in step ② in...

example 3

[0062] A kind of preparation of modified magnesium phosphate cement, comprise main component and auxiliary component, measure as follows in mass percentage:

[0063] (1) Main components

[0064] (1) Magnesium phosphate cement: 75%;

[0065] (2) Phosphogypsum: 6%;

[0066] (3) Fly ash: 19%

[0067] (2) Auxiliary components (percentage of the sum of the mass of the main components)

[0068] (1) etherified glycol agent: 3%;

[0069] (2) retarder: 4%;

[0070] (3) Water retaining agent: 2%;

[0071] According to the magnesium phosphate cement prepared by the method, the preparation steps are as follows:

[0072] ① Weighing: According to the mass ratio of each component, accurately weigh each component, and add the etherified alcohol modifier in the auxiliary component.

[0073] ② Grinding: Put the material obtained in step ① into a ball mill for grinding to obtain a specific surface area of ​​700m 2 / kg mixture.

[0074]③ Mixing: Put the mixture obtained in step ② into a ...

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Abstract

The invention discloses modified magnesium phosphate cement and a preparing method thereof and relates to the field of building materials. The modified magnesium phosphate cement comprises main components and auxiliary components. The main components are 70-85% of magnesium phosphate cement, 5-10% of gypsum and 10-20% of coal ash. The auxiliary components are etherification alcohol modifier, retarder and water-retaining agent, wherein the ratio of the mass of the etherification alcohol modifier to the sum of mass of the main components is 1-5%, the ratio of the mass of the retarder to the sum of mass of the main components is 2-5%, and the ratio of the mass of the water-retaining agent to the sum of mass of the main components is 1-3%. The preparing method comprises the steps of weighing, grinding and mixing. Through surface modification conducted by means of the etherification alcohol modifier, the number of active sites on the surfaces of magnesium phosphate particles is increased, adsorbability of the retarder is improved, interdiffusion of effective ions is slowed, and reaction rate is reduced; meanwhile, under the combined action of the retarder and the water-retaining agent, the performance of the magnesium phosphate cement is well improved. The setting time of the obtained cement is prolonged greatly, the defects of magnesium phosphate cement that early strength enhance rate is high and long-term strength enhance rate is low are overcome, and delayed coagulation time and strength development are both considered fundamentally.

Description

technical field [0001] The invention relates to a modified magnesium phosphate cement, which belongs to the technical field of building materials and can be used in the technical field of structure repair and reinforcement. Background technique [0002] Magnesium phosphate cement (MPC) is a new type of inorganic cementitious material, which combines various excellent properties of cement and ceramics. Magnesium phosphate cement sets quickly, has high early strength, good bonding performance, small shrinkage, high temperature resistance and freeze-thaw resistance, and is widely used in the reinforcement and repair of concrete structures. At the same time, magnesium phosphate cement is also widely used in the biomedical field because of its good antibacterial and degradable properties. [0003] The excellent performance of magnesium phosphate cement comes from the product of struvite structure after the acid-base neutralization reaction between the internal substances. It has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/34C04B111/72
CPCC04B28/344C04B2111/72C04B22/144C04B18/08C04B24/023C04B22/0013C04B24/383
Inventor 李悦林辉
Owner BEIJING UNIV OF TECH
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