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A kind of nanometer aluminum hydroxide accelerator and its preparation method and application

A nano-aluminum hydroxide and aluminum hydroxide technology, applied in the field of cement concrete admixtures, can solve the problems of complex process, unsuitable for large-scale promotion and application, difficult operation, etc., and achieve high reactivity, accelerated hydration and hardening, The effect of improving the early mechanical properties

Active Publication Date: 2022-03-11
WUHAN UNIV OF TECH
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  • Claims
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Problems solved by technology

[0003] At present, nano aluminum hydroxide is usually prepared by liquid phase precipitation method or hydrothermal synthesis method. These two methods have strict requirements on the process parameters of preparation, such as pH value, reaction temperature, reaction time, etc. Difficult to operate, not suitable for large-scale promotion and application

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  • A kind of nanometer aluminum hydroxide accelerator and its preparation method and application
  • A kind of nanometer aluminum hydroxide accelerator and its preparation method and application

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Embodiment Construction

[0019] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0020] The present invention will be described in detail below in conjunction with examples.

[0021] Table 1 shows the raw material ratio of the nano-aluminum hydroxide quick-setting agent of Examples 1 to 5 of the present invention and the particle size characteristics of the nano-aluminum hydroxide quick-setting agent of each embodiment.

[0022] Among them, the dispersant is a solution with a mass fraction of 10% made by mixing polycarboxylate superplasticizer (PCE) and naphthalene-based superplasticizer (FDN), and the anti-sedimentation stabilizer is diethanolamine (DEA) and triethanolamine (TEA). ) mixed mass fraction made of 10% solution, and the mass ratio of polycarboxylate water reducer (PCE) and naphthalene series water reducer (FDN) and diethanolamine (DEA) and triethanolamine (TEA) in each embod...

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Abstract

The present invention provides a nano-aluminum hydroxide quick-setting agent and its preparation method and application. The nano-aluminum hydroxide quick-setting agent is mainly prepared from the following components through a wet grinding process in parts by weight: aluminum hydroxide powder : 210-250 parts, water: 300-400 parts, dispersant: 280-320 parts, anti-sedimentation stabilizer: 130-150 parts. The nano aluminum hydroxide in the nano aluminum hydroxide quick-setting agent of the present invention has quick-setting effect and crystal nucleation effect concurrently, can significantly accelerate the hydration hardening of aluminate mineral in cement clinker, it is 5-8 % when mixed with cement-based materials, the initial setting time of cement paste can be shortened to less than 4 minutes, the final setting time to less than 10 minutes, and the 1d compressive strength of shotcrete can be significantly improved without adverse effects on the later strength. Its various properties have met the requirements of the standard GB / T35159-2017 "Accelerators for Shotcrete" for alkali-free accelerators.

Description

technical field [0001] The invention relates to the technical field of cement concrete admixtures, in particular to a nanometer aluminum hydroxide accelerator and its preparation method and application. Background technique [0002] Nano-aluminum hydroxide is a nano-material widely used in the fields of flame retardancy and catalysis, but there are few studies on its application in other fields. [0003] At present, nano aluminum hydroxide is usually prepared by liquid phase precipitation method or hydrothermal synthesis method. These two methods have strict requirements on the process parameters of preparation, such as pH value, reaction temperature, reaction time, etc. The operation is difficult, and it is not suitable for large-scale promotion and application. Contents of the invention [0004] In view of this, the present invention aims to propose a novel preparation method and application field of nano-aluminum hydroxide, that is, industrial aluminum hydroxide powder...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/24C04B22/06C04B103/12
CPCC04B40/0046C04B2103/12C04B22/06C04B2103/408C04B24/122
Inventor 谭洪波邓秀峰贺行洋蹇守卫苏英郑正旗
Owner WUHAN UNIV OF TECH
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