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A kind of alkali-free concrete surface protective agent and preparation method thereof

A technology for concrete surface and protective agent, applied in the field of building materials, can solve the problems affecting the permeability of water-based permeable crystalline waterproofing agent, concrete alkali-aggregate reaction, low solubility of sodium fluoride, etc., so as to improve the resistance to sulfate corrosion. , Improve the effect of carbonization resistance and rebound strength

Active Publication Date: 2022-02-08
云南凯威特新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN 106083191 B discloses a concrete surface hardener, because sodium silicate, sodium metaaluminate and other alkali (Na 2 O) substances, when used, will cause efflorescence on the surface of concrete, and may cause alkali-aggregate reaction of concrete
Not only that, the solubility of sodium fluoride in water is low, so it will affect the penetration performance of the water-based penetrating crystalline waterproofing agent on the concrete surface

Method used

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  • A kind of alkali-free concrete surface protective agent and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of modified fluorosilicic acid: Add 20°Bé fluorosilicic acid into a three-necked flask, control the temperature at 20°C, turn on the stirrer, control the stirring speed at 80r / min, slowly add ethanolamine into the fluorosilicic acid, dropwise time Controlled at 1.5h. After the dropwise addition is completed, the heat preservation reaction is carried out for 0.5 h, and the modified fluorosilicic acid is obtained. The mass ratio of fluosilicic acid to ethanolamine is 1:0.1;

[0034] Preparation of alkali-free concrete surface protective agent: Add 20 parts of modified fluosilicic acid into the container, add 68.5 parts of water and stir, and control the temperature at 20°C. Then add 8 parts of 20°Bé hydrofluoric acid, 2 parts of ethylenediaminetetraacetic acid, and 0.5 parts of composite surfactant in sequence, and stir for 0.5h. Finally, add 1 part of ethylenediamine to adjust the pH value to 2.4, and the obtained colorless and transparent liquid is the con...

Embodiment 2

[0036] Preparation of modified fluorosilicic acid: Add 30°Bé fluorosilicic acid into a three-necked flask, control the temperature at 30°C, turn on the stirrer, control the stirring speed at 60r / min, slowly add triethanolamine into the fluorosilicic acid, dropwise The time is controlled at 1h. After the dropwise addition is completed, keep the reaction for 1 hour to obtain the modified fluorosilicic acid. The mass ratio of fluosilicic acid to alkanolamine is 1:0.3;

[0037] Preparation of alkali-free concrete surface protection agent: Add 30 parts of modified fluosilicic acid into the container, add 57.5 parts of water and stir, and control the temperature at 40 °C. Then add 2 parts of 40°Bé hydrofluoric acid, 4 parts of ethylene glycol diethyl ether diamine tetraacetic acid, and 1.5 parts of composite surfactant in sequence, and stir for 1.5 hours. Finally, add 5 parts of ammonia water to adjust the pH value to 2.0, and the obtained colorless and transparent liquid is the c...

Embodiment 3

[0039] Preparation of modified fluorosilicic acid: Add 25°Bé fluorosilicic acid into a three-necked flask, control the temperature at 35°C, turn on the stirrer, control the stirring speed at 40r / min, slowly add diethanolamine into the fluorosilicic acid, drop The time is controlled at 2h. After the dropwise addition was completed, the heat preservation reaction was carried out for 0.6h, and the modified fluorosilicic acid was obtained. The mass percentage of fluosilicic acid and alkanolamine is 1:0.2;

[0040] Preparation of alkali-free concrete surface protective agent: Add 25 parts of modified fluosilicic acid into the container, add 62.5 parts of water and stir, and control the temperature at 50°C. Then add 4 parts of 20°Bé hydrofluoric acid, 3 parts of cyclohexanetetraacetic acid, and 1.5 parts of composite surfactant in sequence, and stir for 1 hour. Finally, add 4 parts of diethylamine to adjust the pH value to 3.0, and the obtained colorless transparent liquid is the ...

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Abstract

The invention discloses an alkali-free concrete surface protective agent and a preparation method thereof. The raw material composition of the surface protective agent is calculated by mass percentage: 20%-30% of modified fluosilicic acid; 2%-8% of hydrofluoric acid, Chelating agent 2% to 4%, complex surfactant 0.5% to 1.5%, pH regulator 1% to 5%, and the balance is water; first prepare modified fluosilicic acid, add water and stir, then add hydrofluoric acid, Chelating agent, composite surfactant, finally add pH regulator, adjust the pH value to 2-3, the obtained colorless transparent liquid is the concrete surface protective agent; the invention can effectively improve the compactness of the concrete surface, and significantly reduce the concrete surface The depth of carbonation can improve the concrete's ability to resist sulfate attack and rebound strength. The protective agent is convenient to use, has strong operability and is easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of an alkali-free concrete surface protective agent. Background technique [0002] Concrete is the most widely used building material by humans today. Concrete is a porous composite material. There are many capillary pores or microcracks on the surface of hardened concrete. These capillary pores and microcracks are the necessary conditions for the entry of erosive ions from the outside. As long as this channel is closed, water and microcracks can be effectively prevented. Harmful ions damage the internal structure of concrete, thereby improving the durability of concrete. [0003] At present, the main concrete surface protective agents on the market are divided into three categories: organic protective materials, cement-based osmotic crystalline waterproof materials, and water-based osmotic crystalline protective materials. Organic pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/66
CPCC04B41/66C04B41/5018C04B41/46C04B41/4535
Inventor 刘玮陈家荣王庄赵江
Owner 云南凯威特新材料股份有限公司
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