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High-weatherable single-component organosilicon concrete protective coating and preparation method thereof

A protective coating, silicone technology, applied in the direction of coating, can solve the problems of poor cracking resistance and construction performance, the coating is prone to bulge, poor air permeability, etc., and achieves strong environmental adaptability, alkali resistance and UV resistance. Excellent aging performance and good aging resistance

Inactive Publication Date: 2017-06-09
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the long-term practice process, it is found that the above protective coatings will have the following problems: ①The painting process of acrylic, polyurethane, fluorocarbon and other protective coatings includes interface agent brushing-intermediate paint brushing-finish paint brushing, each The interval between each process is long, and all of them need to be carried out under the condition of dry interface
Therefore, the concrete protection efficiency and the quality of the protective coating are greatly affected by the environment (rainwater, low temperature) and are difficult to control
②Protective coatings such as acrylic, polyurethane, and fluorocarbon have good sealability, but poor air permeability, and the water vapor inside the concrete cannot be discharged, and the coating is prone to swelling and cracking at high temperatures
However, this type of material has poor waterproof performance to the concrete where the water has accumulated for a long time, and the improvement of the frost resistance performance of the concrete is limited.
Solvent-based silicone waterproof coatings have higher requirements on the flatness and treatment of the concrete base surface, and poor crack resistance and construction performance

Method used

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  • High-weatherable single-component organosilicon concrete protective coating and preparation method thereof
  • High-weatherable single-component organosilicon concrete protective coating and preparation method thereof
  • High-weatherable single-component organosilicon concrete protective coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]100 parts of hydroxyl-terminated polydimethylsiloxane, 2 parts of diphenylsiloxane-modified hydroxyl-terminated polydimethylsiloxane, 3 parts of tolylsiloxane-modified hydroxyl-terminated polydimethylsiloxane Parts, 5 parts of silicone diol, 5 parts of silicone polyether diol, 10 parts of low-viscosity terminal hydroxyl polymethylsilane, 5 parts of MDT type silicone oil, 3 parts of dimethyl silicone oil and 7 parts of paraffin mixture In the reaction kettle, vacuum dehydrate at 110°C for 2h; 2 parts of pigment, 1 part of carbon black, 0.5 parts of fumed silica, 4.5 parts of superfine calcium carbonate and 2 parts of diatomaceous earth are dried in a drying oven at 110°C for 2 hours ; Add the dried pigments and fillers to the reaction kettle and stir for 20 minutes; Put the rubber material into the three-roll mill for grinding, the grinding fineness is 20 μm, and cool the rubber material to room temperature; Put the ground rubber material into the planetary stirring tank ...

Embodiment 2

[0042] 100 parts of hydroxyl-terminated polydimethylsiloxane, 6 parts of diphenylsiloxane-modified hydroxyl-terminated polydimethylsiloxane, 4 parts of tolylsiloxane-modified hydroxyl-terminated polydimethylsiloxane 11 parts of silicone diol, 9 parts of silicone polyether diol, 20 parts of low-viscosity terminal hydroxyl polymethylsilane, 5 parts of MDT type silicone oil, 8 parts of dimethyl silicone oil and 12 parts of paraffin mixture Vacuum dehydration at 130°C for 2 hours in a reaction kettle; 1 part of pigment, 2 parts of carbon black, 0.3 parts of fumed white carbon black, 13 parts of superfine calcium carbonate and 13.7 parts of diatomite were dried in a drying oven at 130°C for 2 hours ; Add the dried pigments and fillers to the reaction kettle and stir for 40 minutes; Put the rubber material into the three-roll mill for grinding, the grinding fineness is 40 μm, and cool the rubber material to room temperature; Put the ground rubber material into the planetary stirring ...

Embodiment 3

[0044] 100 parts of hydroxyl-terminated polydimethylsiloxane, 7.5 parts of diphenylsiloxane-modified hydroxyl-terminated polydimethylsiloxane, 15 parts of silicone diol, 20 parts of low-viscosity hydroxyl-terminated polymethylsiloxane 15 parts and 15 parts of dimethyl silicone oil were added to the reaction kettle, and vacuum dehydrated at 120 ° C for 2 hours; 2 parts of pigments, 0.1 parts of fumed silica and 17.9 parts of ultrafine calcium carbonate were dried in a drying oven at 120 ° C for 2 hours; Add the dried pigments and fillers to the reaction kettle and stir for 30 minutes; put the rubber material into a three-roller grinder for grinding, the grinding fineness is 30 μm, and cool the rubber material to room temperature; put the ground rubber material into a planetary stirring tank, and Stir under vacuum for 30 minutes; add 2 parts of ketoximosilane crosslinking agent, 2 parts of allyloxysilane crosslinking agent and 7 parts of amidosilane chain extender, and stir under...

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PUM

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Abstract

Disclosed are high-weatherable single-component organosilicon concrete protective coating and a preparation method thereof; the protective coating is prepared from, by weight, 100 parts of hydroxy-terminated polydimethylsiloxane, 5-10 parts of modified hydroxy-terminated polydimethylsiloxane, 10-20 parts of an active toughener, 15-25 parts of an active plasticizer, 10-20 parts of an inactive plasticizer, 2-6 parts of a crosslinking agent, 4-10 parts of a chain extender, 0.05-0.15 part of a catalyst, and 10-30 parts of pigment-filler. The protective coating of the invention has good infiltrating performance, has no need for an interfacial agent, has high adhesive power with concrete, has suitable mechanical strength and flexibility as well as good cracking resistance, has excellent weatherability and is suitable for low-temperature construction.

Description

technical field [0001] The invention belongs to the technical field of concrete protection, and in particular relates to a high weather resistance one-component organosilicon concrete protective coating and a preparation method thereof. Background technique [0002] Concrete is easily affected by chloride ions, sulfate ions, carbonization, freeze-thaw cycles, etc. in ocean, high-temperature, high-humidity, severe cold and other climatic environments, causing diseases such as pulverization, spalling, and block loss, which lead to the durability of reinforced concrete structures. decline, seriously affecting its service life, and laying hidden dangers for safe service. [0003] In order to ensure the durability of concrete structures, protective coatings are often used to strengthen the concrete surface to isolate the concrete from the external environment and improve the corrosion resistance, medium corrosion resistance and frost resistance of the concrete. Protective coatin...

Claims

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Application Information

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IPC IPC(8): C09D183/06C09D7/12
CPCC08L2201/08C08L2205/025C08L2205/035C09D7/63C09D7/65C09D183/06C08L83/06C08L83/04C08L71/00C08K13/02C08K5/5415
Inventor 靳昊易忠来李化建黄法礼谢永江温浩
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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