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Montmorillonite internal curing agent modified by vinyl carboxylate copolymer and preparation method for montmorillonite internal curing agent

A technology of carboxylic acid vinyl copolymer and sodium montmorillonite, which is applied in the field of concrete admixtures, can solve the problems of excessive air-entrainment, poor cement compatibility, and low water-reducing rate, and achieve obvious curing effect and water-reducing The effect of high efficiency and reduced investment

Inactive Publication Date: 2015-11-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chemical curing method often has problems such as poor compatibility with cement, low water-reducing rate, and excessive air-entrainment.

Method used

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  • Montmorillonite internal curing agent modified by vinyl carboxylate copolymer and preparation method for montmorillonite internal curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Formula: 10% sodium montmorillonite, 48% deionized water, 12% carboxylic acid vinyl copolymer, 7% sodium gluconate, 23% sodium polyacrylate, in terms of mass percentage, the same below.

[0022] Preparation:

[0023] First, dissolve sodium-based montmorillonite, carboxylic acid vinyl copolymer, sodium polyacrylate, and sodium gluconate in deionized water, mix them evenly, heat them with hot air circulation at 55°C to 80°C for about 2-3 hours, and then put them Put it into an oven, dry at a constant temperature of 90°C-100°C for about 5 hours, and then grind to obtain a montmorillonite internal curing agent modified by a carboxylic acid vinyl copolymer.

Embodiment 2

[0025] Formula: 17% sodium montmorillonite, 51% deionized water, 14% carboxylic acid vinyl copolymer, 3% sodium gluconate, 15% sodium polyacrylate.

[0026] Preparation:

[0027] First, dissolve sodium-based montmorillonite, carboxylic acid vinyl copolymer, sodium polyacrylate, and sodium gluconate in deionized water, mix them evenly, heat them with hot air circulation at 55°C to 80°C for about 2-3 hours, and then put them Put it into an oven, dry at a constant temperature of 90°C-100°C for about 5 hours, and then grind to obtain a montmorillonite internal curing agent modified by a carboxylic acid vinyl copolymer.

Embodiment 3

[0029] Formula: 6% sodium montmorillonite, 44% deionized water, 19% carboxylic acid vinyl copolymer, 11% sodium gluconate, 20% sodium polyacrylate.

[0030] Preparation:

[0031] First, dissolve sodium-based montmorillonite, carboxylic acid vinyl copolymer, sodium polyacrylate, and sodium gluconate in deionized water, mix them evenly, heat them with hot air circulation at 55°C to 80°C for about 2-3 hours, and then put them Put it into an oven, dry at a constant temperature of 90°C-100°C for about 5 hours, and then grind to obtain a montmorillonite internal curing agent modified by a carboxylic acid vinyl copolymer.

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Abstract

The invention relates to a montmorillonite internal curing agent modified by vinyl carboxylate copolymer and a preparation method for the montmorillonite internal curing agent. The preparation method comprises the following steps of: 1) batching the following components in percentage by mass: 5%-17% of Na-montmorillonite, 40%-55% of deionized water, 8%-20% of vinyl carboxylate copolymer, 3%-11% of sodium gluconate and 15%-30% of sodium polyacrylate; and taking the components; and 2) dissolving the na-montmorillonite, the vinyl carboxylate copolymer, the sodium polyacrylate and the sodium gluconate into the deionized water, uniformly mixing the components, heating the components by heated air circulation, putting the components into a drying oven, drying the components, and grinding the components, thereby obtaining the montmorillonite internal curing agent. The preparation method for the montmorillonite internal curing agent has the beneficial effects that: firstly, an advanced internal curing method without watering is achieved; secondly, the water-reducing rate is high; thirdly, the pollution of environment is reduced, and the cost is reduced; and fourthly, the preparation method is simple, the curing effect is obvious, slump loss of concrete can be reduced, the strength of the concrete is improved and the service life of the concrete is prolonged.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, and in particular relates to a montmorillonite internal curing agent modified by a vinyl carboxylate copolymer and a preparation method thereof. Background technique [0002] In the concrete construction process, the concrete curing room is a very important link. The degree of hydration of cement determines the strength of concrete to a large extent, and the hydration of cement can only occur in the capillary filled with water. Therefore, in order to fully hydrate the cement, it is necessary to prevent water from evaporating from the capillary. This ensures that the strength of the concrete continues to grow. Otherwise, in a dry environment, the hydration of the cement will stop with the evaporation of water, and cause structural cracks and loose structures in the concrete, thereby affecting the durability and strength of the concrete. Therefore, it is particularly important to create a moist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26
Inventor 谭洪波李信马保国林超亮
Owner WUHAN UNIV OF TECH
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