Organic silicon waterproof agent with respiratory function and preparation method thereof

A technology of breathing function and silicone, applied in the field of silicone waterproofing agent and its preparation, can solve the problems of easy blocking of concrete capillary openings, insufficient penetration depth of cement components, and reduced air permeability of waterproofing agent, etc., to achieve excellent breathing performance and improve oil resistance. , the effect of good breathing performance

Inactive Publication Date: 2011-10-19
HENAN PROVINCIAL TRANSPORTATION RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that it contains a hydrophilic emulsifier, and its water-repellent and waterproof ability is not as good as that of the bulk solution type waterproofing agent. In addition, its penetration depth of cement components is not as good as that of the solvent bulk type, especially the silicone oil with a large molecular weight cannot penetrate into the surface of the substrate, so it is waterproof poor durability
[0006]In recent years, in order to improve the oil resistance and stain resistance of silicone, researchers proposed to prepare fluorine-containing silicone waterproofing agent, and the addition of hydroxyfluorosilicone oil significantly improved the waterproofing agent However, because hydroxyfluorosilicone oil is easy to block the capillary opening of concrete, it reduces the air permeability (breathing function) of the waterproofing agent, so its application is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of an organosilicon waterproofing agent with breathing function, which comprises the steps of:

[0035] ①Mix 120 parts of propyltrimethoxysilane, 20 parts of deionized water, and 360 parts of ethanol in a reaction flask, heat to 56°C, add hydrochloric acid solution (concentration: 0.1mol / L), keep the reaction for 8h;

[0036] ②The pH value of the system was adjusted to 7 by adding sodium hydroxide solution, and the reaction was continued for 2 hours, then the solvent ethanol, water and the alcohol generated by the reaction were distilled off, and then cooled to room temperature to obtain a silicone resin preform with a bulk viscosity of 12000mPa.s. Aggregate, the active ingredient;

[0037] ③ Mix the active component, solvent ethanol and catalyst dibutyltin dilaurate in proportion (the mass ratio of the added ethanol to the active component is 8:1, and the addition amount of dibutyltin dilaurate is 1 / 2 of the mass of the active component 0.2%), t...

Embodiment 2

[0039] Replace 0.1 mol / L hydrochloric acid solution with 0.1 mol / L sodium hydroxide solution, adjust the pH value of the system to 7 with sulfuric acid solution, and other conditions are the same as in Example 1 to obtain propyltrimethoxysilane waterproofing agent. According to JC / T902-2002, the measured water absorption ratio is 7.8%; the waterproofing agent is sprayed on the concrete surface with a water content of 10%, and after 72 hours, the water content of the concrete is 2.2%. After immersing the concrete specimen sprayed with the waterproofing agent in water for 720 hours, the water absorption ratio is calculated to be 13.5% according to JC / T902-2002.

Embodiment 3

[0041] Replace the 0.1mol / L hydrochloric acid solution with 0.1mol / L ammonia solution, adjust the pH value of the system with trifluoroacetic acid solution, replace ethanol with isopropanol, and other conditions are the same as in Example 1 to obtain propyltrimethoxysilane waterproof agent. According to JC / T902-2002, the measured water absorption ratio is 6.4%; the waterproofing agent is sprayed on the concrete surface with a water content of 10%, and after 72 hours, the water content of the concrete is 2.0%. After immersing the concrete specimen sprayed with the waterproofing agent in water for 720 hours, the water absorption ratio is calculated to be 12.1% according to JC / T902-2002.

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Abstract

The invention relates to an organic silicon waterproof agent with a respiratory function, which contains an active ingredient, a solvent and a catalyst, and is characterized in that the active ingredient is obtained in a way that alkyl siloxane coupling agent and / or fluoro alkyl siloxane coupling agent are / is mixed with a solvent, and then are / is subjected to hydrolysis reaction under the action of acid or alkali; and the structural formula of the siloxane coupling agent is Rn-Si(OR')4-n, wherein R is a saturated long-chain alkyl with the carbon atom number of 3-12 or a full-fluoro or partial-fluoro saturated long-chain alkyl with the carbon atom number of 3-12, R' is methyl or ethyl, and n is 1 or 2. By introducing fluoro alkyl siloxane, the waterproof agent not only has excellent waterproof performance and respiratory function, but also has the advantages of being good in adhesive force, solvent -resistant, acidproof and alkaliproof, aging- resistant, dirt-resistant and the like, and is especially applicable to water prevention of the surfaces of concrete and other porous members, particularly the surfaces of buildings, highways, bridges, guardrails and the like.

Description

technical field [0001] The invention belongs to the technical field of water repellent for the surface of porous materials, and in particular relates to a silicone water repellent with breathing function and a preparation method thereof. Background technique [0002] Water is an important substance that causes durability damage to cement concrete structures and reinforced concrete structures. Whether it is soft water erosion of cement concrete, freeze-thaw damage, alkali-aggregate reaction, corrosion of steel bars, or even the dissolution of hydraulic engineering and port structures, it is inseparable from the role of water. Without the participation of water, most erosion will hardly occur. Therefore, waterproofing is an important measure, even a fundamental measure, to improve the durability of cement concrete structures. Silicone waterproofing agent is an important waterproofing agent for concrete. Because of its good hydrophobicity, weather resistance, high and low temp...

Claims

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Application Information

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IPC IPC(8): C04B41/49
CPCC04B24/42
Inventor 赵豫生黄正强刘国杰王明伟郭铁惠王妍薇张正珂黄运军李玉磊汪德才
Owner HENAN PROVINCIAL TRANSPORTATION RES INST
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