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A kind of hydrophobic microcapsule and preparation method thereof

A technology of microcapsules and hydrophobic materials, applied in the field of road materials, can solve the problems of affecting the performance of concrete, having no obvious chemical effect, affecting the strength and durability of cement concrete, and achieving the effect of improving mechanical properties and improving impermeability.

Active Publication Date: 2019-04-26
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are problems: 1) after the microcapsules are added to the concrete, they will break at any time, and the core material and the wall material will affect the performance of the concrete; 2) there is no gap between the core material and the wall material of the microcapsules and the cement hydration product Obvious chemical action, on the contrary, after the microcapsules are broken, voids or defects will be generated inside the concrete, which will affect the strength and durability of cement concrete

Method used

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  • A kind of hydrophobic microcapsule and preparation method thereof
  • A kind of hydrophobic microcapsule and preparation method thereof
  • A kind of hydrophobic microcapsule and preparation method thereof

Examples

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Embodiment 1

[0034] This embodiment provides a kind of hydrophobic microcapsule, wherein, the addition amount of polymethyl methacrylate polymer, hydrophobic material and cage type silsesquioxane is 1:1:0.001 by mass ratio;

[0035] The mass concentration of the emulsifier in the water phase is 1%.

[0036] Based on the raw material formula of this embodiment, the specific preparation process of the hydrophobic microcapsules of this embodiment is as follows:

[0037] Step 1, weigh 2g of gelatin and dissolve it in 200ml of deionized water, heat and stir until it is completely dissolved, and obtain an aqueous phase with an emulsifier mass concentration of 1%;

[0038] Step 2, weigh 2g of polymethyl methacrylate polymer and 2g of methyl silicone oil and dissolve in 20ml of organic solvent methylene chloride, stir to dissolve completely, then add 0.002g of silanol polysilsesquioxane to it , stir evenly, and the solution formed is an oil phase;

[0039] Step 3: Slowly add the oil phase to the...

Embodiment 2

[0057] This example provides a kind of hydrophobic microcapsule, wherein, the addition amount of polystyrene, hydrophobic material and cage silsesquioxane is 2:2:0.005 by mass ratio;

[0058] The mass concentration of the emulsifier in the water phase is 2%.

[0059] The requirements for raw materials and the preparation method of hydrophobic microcapsules and cement concrete in this example are the same as those in Example 1.

[0060] The test method of the cement concrete specimen of this embodiment is the same as that of Example 1, and the test results are shown in Tables 1-3.

Embodiment 3

[0062] This example provides a hydrophobic microcapsule, wherein the amount of polystyrene, hydrophobic material and cage silsesquioxane added is 1:1:0.001 by mass ratio;

[0063] The mass concentration of the emulsifier in the water phase is 1%.

[0064] In this embodiment, the requirements for raw materials and the preparation method of hydrophobic microcapsules and cement concrete are all the same as in Example 1. The difference is that the cage-type silsesquioxane adopts vinyl polysilsesquioxane, and the hydrophobic The material is tetraethoxysilane.

[0065] The test method of the cement concrete specimen of this embodiment is the same as that of Example 1, and the test results are shown in Tables 1-3.

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Abstract

The invention provides a hydrophobic microcapsule and a preparation method thereof. The core of the hydrophobic microcapsule is made of a hydrophobic material, the microcapsule wall is made of a composite material of polyhedral oligomeric silsesquioxane with a functional group and a polymethyl methacrylate polymer or polystyrene, and the hydrophobic material is methylsilicone oil, sodium methyl silicate, organosilane, tetraethoxysilane or organo-siloxane. The wall material of the hydrophobic microcapsule is gradually thinned until fractured slowly under the alkaline condition of concrete, the hydrophobic material in the hydrophobic microcapsule is slowly released, the hydrophobic speed is manually controlled, and the impermeability of the cement concrete is remarkably improved. Besides, as the hydrophobic microcapsule is not fractured at the early stage of mixing and hydrating the cement concrete, the normal hydration of the cement in the concrete is not affected, and the polyhedral oligomeric silsesquioxane with the functional group has a triggering effect, can react with a component in the concrete to generate a secondary product, so that the mechanical property of the concrete is improved.

Description

technical field [0001] The invention belongs to the field of road materials and relates to concrete hydrophobic materials, in particular to a hydrophobic microcapsule and a preparation method thereof. Background technique [0002] Due to the internal cement hydration or volume shrinkage of concrete, the water evaporates, resulting in the increase of its pores or the increase of connected pores, which significantly reduces its impermeability. The common technical means to improve the impermeability of cement concrete is to increase the density of concrete and improve the pore structure, thereby reducing the permeation channels and improving the impermeability. The commonly used method is to mix air-entraining admixtures to generate disconnected air bubbles inside the concrete, cut off the capillary channels, and change the pore structure, thereby improving the impermeability of the concrete. In addition, reducing the water-cement ratio, selecting cement of appropriate variet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42C04B28/04C04B103/65C04B111/27
CPCC04B28/04C04B40/0046C04B2103/0069C04B2103/65C04B2111/27C04B2201/50C04B24/283C04B24/42C04B24/2676C04B22/002C04B14/068C04B18/12
Inventor 王振军赵鹏阎鑫吴佳育艾涛刘加平李辉
Owner CHANGAN UNIV
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