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A kind of reinforced magnesium phosphate cement composite material and preparation method thereof

A magnesium phosphate cement and composite material technology, applied in the field of new building materials, can solve the problems of low strength and inapplicability, and achieve the effect of high strength, sufficient reaction and improved stability

Active Publication Date: 2022-02-25
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Magnesium phosphate cement is usually composed of magnesium oxide, phosphate, retarder and other components, which leads to many reinforcement methods that can be used in Portland cement, which become inapplicable in magnesium phosphate cement
However, the strength of magnesium phosphate cement is lower than that of Portland cement, so it is urgent to strengthen and modify, and there are few reports on the enhancement method of magnesium phosphate cement at the nanometer level.

Method used

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  • A kind of reinforced magnesium phosphate cement composite material and preparation method thereof
  • A kind of reinforced magnesium phosphate cement composite material and preparation method thereof
  • A kind of reinforced magnesium phosphate cement composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment provides graphene oxide / carbon nanotube synergistically reinforced magnesium phosphate cement composite material, including graphene oxide / carbon nanotube composite modifier, magnesium phosphate cement dry material and water, wherein, graphene oxide / carbon nanotube composite The modifier is compounded by commercial few-layer graphene oxide and multi-wall carbon nanotubes, and the dry weight ratio of commercial few-layer graphene oxide and multi-wall carbon nanotubes is 1:1. In specific implementation, multilayer graphene oxide or single-walled carbon nanotubes can also be selected, and the number of graphene oxide and carbon nanotube monomer layers does not affect the essence of the present invention. The ratio of the total dry weight of commercial few-layer graphene oxide and multi-walled carbon nanotubes to the dry weight of magnesium phosphate cement dry material is 0.05:100. The mass ratio of water to magnesium phosphate cement dry matter is 0.15. T...

Embodiment 2

[0043]This embodiment provides graphene oxide / carbon nanotube synergistically reinforced magnesium phosphate cement composite material, including graphene oxide / carbon nanotube composite modifier, magnesium phosphate cement dry material and water, wherein, graphene oxide / carbon nanotube composite The modifier is compounded by commercial few-layer graphene oxide and multi-wall carbon nanotubes, and the dry weight ratio of commercial few-layer graphene oxide and multi-wall carbon nanotubes is 1:1. The ratio of the total dry weight of commercial few-layer graphene oxide and multi-walled carbon nanotubes to the dry weight of magnesium phosphate cement dry material is 0.1:100. The mass ratio of water to magnesium phosphate cement dry matter is 0.15. Magnesium phosphate cement dry material is composed of dead-burned magnesia, borax and potassium dihydrogen phosphate. The specific proportioning of each component of this embodiment is shown in Table 1.

[0044] The above-mentioned g...

Embodiment 3

[0051] This example provides graphene oxide / carbon nanotube synergistically reinforced magnesium phosphate cement composite material. The difference between this example and Example 1 is that polycarboxylate water reducer is added, polycarboxylate water reducer and magnesium phosphate cement dry material The ratio of parts by weight is 0.1:100, and other conditions are the same as in Example 1. The specific proportioning of each component of this embodiment is shown in Table 1.

[0052] The above-mentioned graphene oxide / carbon nanotube synergistically reinforced magnesium phosphate cement composite material can be prepared by the following method:

[0053] A graphene oxide aqueous solution with a concentration of 0.05 g / L was prepared.

[0054] Add carbon nanotubes to the graphene oxide aqueous solution, mix them in a beaker, stir with a glass rod until no flocs are visible to the naked eye, and put them into an ultrasonic disperser to prepare a graphene oxide / carbon nanotub...

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Abstract

The invention provides a reinforced magnesium phosphate cement composite material and a preparation method thereof. The composite material includes a graphene oxide / carbon nanotube composite modifier and magnesium phosphate cement dry material, and the graphene oxide / carbon nanotube composite modifier is formed by oxidation Graphene and carbon nanotubes are compounded, and the ratio of the total dry weight of graphene oxide and carbon nanotubes to the dry weight of magnesium phosphate cement is 0.01-0.5:100. The method includes: preparing a graphene oxide / carbon nanotube composite modifier; mixing the prepared graphene oxide / carbon nanotube composite modifier with magnesium phosphate cement dry material, stirring evenly to obtain cement slurry; pouring the cement slurry to the mold Type, the air bubbles are removed by shaking, the surface of the mold is covered with a film, and the mold is demoulded after curing, and finally cured to the age of use. The magnesium phosphate cement prepared by the invention has high strength and good mechanical properties, and the internal structure is orderly and dense, the pore structure is optimized, and the durability is good.

Description

technical field [0001] The invention relates to the technical field of new building materials, in particular to a graphene oxide / carbon nanotube synergistically reinforced magnesium phosphate cement composite material and a preparation method thereof. Background technique [0002] Magnesium phosphate cement has the advantages of strong durability, high strength, no pollution, quick setting and early strength, strong cohesion, good compatibility with original concrete, and good biocompatibility. The application in the scene is very rich. The reaction mechanism of magnesium phosphate cement is an acid-base reaction, forming chemical bonds to produce a gelling effect. The main components providing strength are compounds such as magnesium potassium phosphate. [0003] Magnesium phosphate cement is usually composed of magnesium oxide, phosphate, retarder and other components. Magnesium phosphate cement and ordinary Portland cement have different gelation principles through hyd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/34C04B14/02C04B24/24C04B103/30
CPCC04B28/34C04B14/024C04B14/026C04B24/24C04B2103/302C04B22/002
Inventor 杜宇航杨健李粒珲李环宇
Owner SHANGHAI JIAOTONG UNIV
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