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Application of graphene oxide/butyl acrylate/silane composite emulsion as anti-shrinking agent

A technology of butyl acrylate and composite emulsion, which is applied in the field of cement-based materials, and can solve the problems of affecting the hydration rate of cement and the decrease of cement matrix strength.

Active Publication Date: 2021-09-17
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of concrete solidification and hardening, the cracking problem caused by concrete shrinkage has been unavoidable
However, after the two materials form a film, it will affect the cement hydration rate, resulting in a decrease in the strength of the cement matrix.

Method used

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  • Application of graphene oxide/butyl acrylate/silane composite emulsion as anti-shrinking agent
  • Application of graphene oxide/butyl acrylate/silane composite emulsion as anti-shrinking agent
  • Application of graphene oxide/butyl acrylate/silane composite emulsion as anti-shrinking agent

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preparation example Construction

[0049] In the present invention, the preparation method of described graphene oxide / butyl acrylate / silane composite emulsion preferably comprises the following steps:

[0050] (1) first mixing the first emulsifier, isobutyltriethoxysilane, butyl acrylate and dispersant to obtain an oil phase;

[0051](2) Graphene oxide, the second emulsifier, sodium silicate and water are mixed for the second time to obtain an aqueous phase;

[0052] (3) adding the oil phase to the water phase to carry out emulsification reaction to obtain graphene oxide / butyl acrylate / silane composite emulsion;

[0053] There is no time sequence limitation between the steps (1) and (2).

[0054] In the present invention, the first emulsifier, isobutyl triethoxysilane, butyl acrylate and dispersant are first mixed to obtain an oil phase. In the present invention, a homogenizer is preferably used for the first mixing, the speed of the first mixing is preferably 1000-2200r / min, more preferably 1500-2000r / min; ...

Embodiment 1

[0067] Prepare graphene oxide / butyl acrylate / silane composite emulsion, raw materials include:

[0068]

[0069] The preparation method comprises the following steps:

[0070] (1) Use a homogenizer to perform the first stirring and mixing of Tween 20, isobutyltriethoxysilane, butyl acrylate and dispersant at a mixing speed of 2000r / min and a temperature of 40°C to obtain an oil phase;

[0071] (2) Use a homogenizer to carry out the second stirring and mixing of graphene oxide, propylene glycol fatty acid ester, sodium silicate and water, the mixing speed is 2000r / min, and the temperature is 40°C to obtain an aqueous phase;

[0072] (3) The oil phase is added dropwise to the water phase, and stirred at a constant temperature at 50°C. After the dropwise addition is completed, the emulsification reaction is carried out under stirring at 2500r / min. The temperature of the emulsification reaction is 50°C, and the time is 4h, to obtain Graphene oxide / butyl acrylate / silane composi...

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Abstract

The invention provides application of a graphene oxide / butyl acrylate / silane composite emulsion as a cement-based material anti-shrinking agent, and belongs to the technical field of cement-based materials. According to the invention, active groups on isobutyltriethoxysilane molecules react with hydroxyl groups on the surface of the mortar to form a layered hydrophobic structure, so that the loss of water in the cement-based material mortar is slowed down, and cracking caused by drying shrinkage is avoided; butyl acrylate can be dehydrated to form space network-shaped polymer fibers which are filled in holes of the cement paste, so that the shrinkage of the mortar is limited; the graphene oxide has a large specific surface area and surface oxygen-containing functional groups, can provide growth sites for hydration products, and promotes the hydration products to form regular and compact structures in a template manner, so that the strength of the cement-based material is ensured; and sodium silicate is doped into the cement-based material and can be hydrolyzed to generate silica gel, the silica gel can react with calcium ions to generate C-S-H gel, matrix pores are filled, and the early strength of the cement-based material is improved.

Description

technical field [0001] The invention relates to the technical field of cement-based materials, in particular to the application of graphene oxide / butyl acrylate / silane composite emulsion as an anti-shrinkage agent for cement-based materials. Background technique [0002] Concrete is a typical cement-based material, which is widely used in roads, bridges, dams and other projects because of its easy availability and relatively low price of raw materials. However, in the process of concrete setting and hardening, the problem of cracking caused by concrete shrinkage has been unavoidable. For ordinary concrete, drying shrinkage accounts for about 80% to 90% of the total shrinkage, which is the main factor causing concrete cracking. Drying shrinkage is due to the fact that the relative humidity inside the concrete is higher than the relative humidity of the external environment, so that the internal moisture is quickly lost. When the water is lost, the water level inside the capi...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B28/00C08F120/18C08F2/44
CPCC04B40/0039C04B28/00C08F120/18C08F2/44C04B22/06C04B24/42C04B24/045C04B12/04C04B24/32Y02W30/91
Inventor 李绍纯徐士林刘昂耿永娟侯东帅张瑞永金祖权高嵩
Owner QINGDAO TECHNOLOGICAL UNIVERSITY