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Alkali-free concrete surface protective agent and preparation method thereof

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

Active Publication Date: 2020-04-07
云南凯威特新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Alkali-free concrete surface protective agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0033] Preparation of modified fluorosilicic acid: add 20°Bé fluorosilicic acid to a three-necked flask, control the temperature at 20°C, turn on the stirrer, and control the stirring speed at 80r / min. Add ethanolamine slowly to the fluorosilicic acid, dripping time Control in 1.5h. After the dripping is completed, the reaction is kept for 0.5h to obtain modified fluorosilicic acid. The mass ratio of fluorosilicic acid to ethanolamine is 1:0.1;

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

Embodiment 2

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

[0037] Preparation of alkali-free concrete surface protective agent: Add 30 parts of modified fluorosilicic acid to the container, add 57.5 water to 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, 1.5 parts of composite surfactant, and stir for 1.5 hours. Finally, add 5 parts of ammonia to adjust the pH to 2.0, and the colorless and transparent liquid obtained is the concrete surface protective agent. Among t...

Embodiment 3

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

[0040] Preparation of alkali-free concrete surface protective agent: add 25 parts of modified fluorosilicic acid to the container, add 62.5 parts of water and stir, and the temperature is controlled 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, 4 parts of diethylamine are added to adjust the pH value to 3.0, and the colorless and transparent liquid obtained is the concrete surface p...

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Abstract

The invention discloses an alkali-free concrete surface protective agent and a preparation method thereof. The alkali-free concrete surface protective agent comprises the following raw materials in percentage by mass: 20-30% of modified fluosilicic acid, 2-8% of hydrofluoric acid, 2-4% of a chelating agent, 0.5-1.5% of a composite surfactant, 1-5% of a pH regulator and the balance of water. The preparation method comprises the following steps: preparing modified fluosilicic acid, adding water, stirring, sequentially adding hydrofluoric acid, a chelating agent and a composite surfactant, finally adding a pH regulator, and regulating the pH value to 2-3 to obtain a colorless transparent liquid, ie., the concrete surface protective agent. According to the invention, wit the alkali-free concrete surface protective agent, the compactness of the concrete surface can be effectively improved, the carbonization depth of concrete is significantly reduced, the sulfate corrosion resistance of concrete is improved, and the resilience strength is improved; and the protective agent is convenient to use, high in operability and easy to popularize.

Description

Technical field [0001] The invention belongs to the technical field of building materials, and specifically relates to a preparation method of an alkali-free concrete surface protective agent. Background technique [0002] Concrete is the most used building material by humans today. Concrete is a porous composite material. There are many pores or micro-cracks on the surface of hardened concrete. These pores and micro-cracks are necessary conditions for the entry of external corrosive ions. 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 organic protective materials, cement-based permeable crystalline waterproof materials, and water-based permeable crystalline protective materials. Organic protective materials mainly rely on the formation of a wate...

Claims

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Application Information

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Patent Type & Authority Applications(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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