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Micro-nano ultrafine powder re-dispersed in water and preparation method of powder

An ultra-fine powder, micro-nano technology, used in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve problems such as transportation and storage difficulties, high surface energy, concrete defects, etc., to achieve easy storage and The effect of simple transportation and preparation method and convenient engineering use

Active Publication Date: 2017-06-09
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the micro-nano ultra-fine powder has a small particle size and high surface energy, and has a tendency to spontaneously agglomerate in thermodynamics. After the micro-nano ultra-fine powder is agglomerated, it will greatly affect the advantages of the micro-nano ultra-fine powder, and may even cause damage to the interior of the concrete. Defects affect the mechanical properties and durability of concrete, so the dispersion problem is one of the main reasons hindering the application of micro-nano ultra-fine powder engineering
Most of the existing micro-nano ultra-fine powders can only be applied in the laboratory, and cannot be re-dispersed, and transportation and storage are very difficult, especially when they are applied on a large scale in actual engineering. Applicable to the actual engineering environment and working conditions, the dispersion effect and robustness of the micro-nano ultra-fine powder are very poor, which seriously limits the application of the micro-nano ultra-fine powder in concrete engineering

Method used

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preparation example Construction

[0037] Another embodiment of the present invention proposes a method for preparing micro-nano ultrafine powder redispersed in water, which includes the following steps:

[0038] In terms of weight percentage, mix and grind micro-nano ultrafine powder: 25-45 parts, water-absorbing swelling agent: 0.2-8 parts, dispersant: 0.5-5 parts and stabilizer 0.2-1 part, and grind to obtain a mixed powder. Add ethanol aqueous solution, mix, granulate, and sieve to obtain micro-nano ultra-fine powder redispersed in water;

[0039] Wherein, the mass of the ethanol aqueous solution is 1%-9% of the mass of the mixed powder.

[0040] Preferably, the grinding time in the preparation method of the micro / nano ultrafine powder redispersed in water according to the embodiment of the present invention is 20-30 min.

[0041] Preferably, the mass concentration of the ethanol aqueous solution in the preparation method of the micronano ultrafine powder redispersed in water according to the embodiment of...

Embodiment 1

[0045] In terms of weight percentage, 30 parts of micro-nano silica powder, 0.8 part of croscarmellose sodium, 1 part of polycarboxylate water reducer and 0.8 part of sodium polyacrylate were mixed, and ground in a ball mill for 30 minutes. To obtain the mixed powder, add an aqueous ethanol solution with a mass concentration of 55%, mix evenly, granulate, and sieve to obtain a micronano ultrafine powder with a particle size of 1200 μm redispersed in water, which is packed in an aluminum-plastic composite moisture-proof packaging bag; Wherein, the mass of the ethanol aqueous solution is 2% of the mass of the mixed powder.

Embodiment 2

[0047] In terms of weight percentage, 35 parts of micro-nano silica powder, 1.2 parts of polyvinylpyrrolidone, 0.9 parts of anthracene-based water reducer and 1 part of hydroxyethyl cellulose were mixed, and ground in a ball mill for 20 minutes to obtain a mixed powder. Add Ethanol aqueous solution with a mass concentration of 65%, mixed evenly, granulated, and sieved to obtain a micronano ultrafine powder with a particle size of 1500 μm redispersed in water, packed in an aluminum foil bag moisture-proof packaging bag; wherein, the ethanol aqueous solution The quality of is 3% of described mixed powder mass.

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Abstract

The invention relates to micro-nano ultrafine powder re-dispersed in water and a preparation method of the powder. The preparation method includes the steps: mixing and grinding 25-45 parts of micro-nano ultrafine powder, 0.2-8 parts of water absorption expanding agents, 0.5-5 parts of dispersing agents and 0.2-1 part of stabilizers by weight to obtain mixed powder; adding ethanol aqueous solution; uniformly mixing the solution; granulating and sieving the mixture to obtain the micro-nano ultrafine powder re-dispersed in the water. The weight of the ethanol aqueous solution accounts for 1%-9% of that of the mixed powder. The preparation method of the micro-nano ultrafine powder re-dispersed in the water is simple and can be used for technological production. The prepared micro-nano ultrafine powder re-dispersed in the water can be used for preparing micro-nano admixture of cement-based materials, has the advantages of easiness in storage and transportation, capability of facilitating practical engineering use and the like, and can be widely used for preparing cement paste, mortar, concrete and gypsum products.

Description

technical field [0001] The invention relates to a micronano ultrafine powder, in particular to a micronano ultrafine powder redispersed in water and a preparation method thereof. Background technique [0002] In the preparation process of high-strength or ultra-high-strength concrete, the use of micro-nano ultra-fine admixtures can significantly improve the densification of concrete, promote hydration, increase the early strength of concrete, improve workability, effectively reduce concrete cracking and prevent alkali-aggregate reaction , making the microstructure denser, improving the durability and service life of concrete. [0003] However, the micro-nano ultra-fine powder has a small particle size and high surface energy, and has a tendency to spontaneously agglomerate in thermodynamics. After the micro-nano ultra-fine powder is agglomerated, it will greatly affect the advantages of the micro-nano ultra-fine powder, and may even cause damage to the interior of the concre...

Claims

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Application Information

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IPC IPC(8): C04B20/02C04B18/08C04B18/14C04B18/10C04B14/10C04B14/06C04B14/02C04B14/28
CPCC04B20/026C04B20/023C04B14/062C04B14/106C04B20/008Y02W30/91
Inventor 姚燕王振地王玲吴浩
Owner CHINA BUILDING MATERIALS ACAD