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A kind of preparation method of micron capsule type water-repellent agent

A water-repellent, micron-scale technology, which is applied in the field of preparation of micron-scale capsule-type water-repellent, can solve the problems of easy weathering and falling off, loss of waterproof function, and reduction of cement concrete strength performance, so as to improve fluidity and compactness, The effect of increasing strength

Active Publication Date: 2021-05-28
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that it affects the hydration reaction of cement concrete and reduces the strength performance of cement concrete.
The second method is to coat the surface of hardened cement concrete with a waterproof material to form a waterproof film on the surface to prevent moisture from penetrating into the concrete. The disadvantage of this method is that the waterproof film is easy to weather and fall off in the use environment on the concrete surface. Lost waterproof function

Method used

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  • A kind of preparation method of micron capsule type water-repellent agent

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preparation example Construction

[0041] The preparation method of the micron-sized capsule type water-repellent provided by the present invention mainly has three steps, at first is to prepare core material solution, wall material solution and initiator solution, core material, wall material and initiator are mixed with solvent respectively, fully stir to carry out Emulsify, then add the initiator solution to the prepared core material solution, heat and stir at a certain temperature, the initiator decomposes to generate free radicals, collects on the surface of the micro-droplets, and facilitates the polymerization reaction; finally passes through the wall material solution and the initiator After the solution is mixed, the emulsion is slowly added into the four-necked flask in the form of droplets, and the reaction proceeds smoothly. The micro-droplets of the wall material and the micro-droplets of the core material undergo a polymerization reaction, the free radical reaction breaks the emulsion, and the inte...

Embodiment 1

[0067] A kind of preparation method of micron capsule type water-repellent provided by the present invention, comprises the following steps:

[0068] (1) Preparation of core material solution

[0069] Weigh 20g of deionized water, 10g of simethicone, and 20g of compound emulsifier into a beaker, and stir in a 50°C water bath at a constant temperature. After stirring evenly, emulsify in a high-shear emulsifier at a speed of 10,000r / min. The core material emulsion was made in ten minutes.

[0070] The compound emulsifier is NP-40 and Tween 80, and the compound mass ratio is 0.72:0.28.

[0071] (2) Preparation of wall material solution

[0072] Weigh 50g of absolute ethanol, 20g of deionized water, and 20g of methyl methacrylate into a beaker, mix and stir evenly to obtain a wall material solution, and set aside.

[0073] (3) Preparation of initiator solution

[0074] Weigh 0.4g of the initiator ammonium persulfate and place it in a test tube, then add 4g of deionized water, ...

Embodiment 2

[0082] In this example, the steps for preparing micron-sized capsule-type water repellent are as follows:

[0083] (1) Preparation of core material solution

[0084] Weigh 10g of deionized water, 10g of simethicone, and 20g of compound emulsifier into a beaker, and stir in a 40°C water bath at a constant temperature. After stirring evenly, emulsify in a high-shear emulsifier at a speed of 10,000r / min. The core material emulsion was made in ten minutes.

[0085] The compound emulsifier is NP-40 and Tween 80, and the compound mass ratio is 0.62:0.38.

[0086] (2) Preparation of wall material solution

[0087] Weigh 20g of absolute ethanol, 50g of deionized water, and 20g of methyl methacrylate into a beaker, mix and stir evenly to obtain a wall material solution, and set aside.

[0088] (3) Preparation of initiator solution

[0089] Weigh 0.4g of the initiator ammonium persulfate and place it in a test tube, then add 8g of deionized water, dissolve and shake, fully dissolve ...

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Abstract

The present invention provides a kind of preparation method of micron capsule type hydrophobic agent, comprises the following steps: (1) the preparation of core material solution; (2) the preparation of wall material solution; (3) the preparation of initiator solution; (4) Generation of free radicals; (5) Polymerization. The micron-sized capsule prepared by the preparation method of the present invention is to coat the liquid hydrophobic material in the solid microsphere and add it during the cement concrete mixing process, which not only avoids the influence of the liquid hydrophobic material on the cement hydration reaction, It can also release hydrophobic substances in the internal pores of cement concrete, overcome the shortcomings of surface waterproofing agents that are easy to fall off and fail, improve the fluidity and compactness of cement concrete, and play a role in improving the strength of cement concrete, thereby achieving the purpose of improving the life of buildings Purpose.

Description

technical field [0001] The invention belongs to the technical field of waterproofing agent preparation, and in particular relates to a preparation method of a micron-sized capsule type water-repellent agent. Background technique [0002] With the progress of society and the development of economy, my country's cement industry is also developing rapidly. Whether it is ground construction or reinforcement of underground mines, modern construction technology has more and more requirements for concrete; Cement concrete itself is a porous material. In the process of use, due to the existence of moisture, cement will be eroded for various reasons, causing large-scale gaps and cracks in the building, which will greatly weaken the mechanical properties of cement concrete and destroy it. The building structure greatly shortens the service life of the building. [0003] Therefore, modern construction technology requires concrete not only to have appropriate compressive, flexural, tensi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42C08F120/14C08F2/30B01J13/14C04B103/65
CPCB01J13/14C04B40/0046C04B2103/65C08F2/30C08F120/14C04B24/42C04B24/2641
Inventor 张海波汪强侯成岩曹俊陈宇
Owner HENAN POLYTECHNIC UNIV