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One-step in-situ synthesis method for organic and inorganic composite anticorrosive pigment

An inorganic composite, anti-corrosion pigment technology, applied in inorganic pigment treatment, anti-corrosion coatings, dyed low-molecular-weight organic compound treatment and other directions, can solve the problems of inability to protect metal materials well, poor dispersion of zinc phosphate particles, etc. The effect of crystal growth, reduction of production cost, and simplification of the preparation process

Inactive Publication Date: 2016-12-07
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Added as an anti-corrosion pigment to the paint, the resulting paint film has good adhesion to the substrate, which solves the problem of difficulty in uniform coating on the surface of the corroded metal substrate due to agglomeration caused by too large particles of zinc phosphate and poor dispersion; The Zn-N bond formed in the one-step in-situ synthesis process forms a chelate to cover the surface of the metal substrate, which makes up for the shortcoming that the inorganic anticorrosion cannot protect the metal material well in the early stage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to the molar ratio of zinc phosphate and benzotriazole of 1:1, weigh 3.0 g of sodium phosphate and 1.3 g of benzotriazole and disperse in 100 mL of deionized water to form dispersion system A; weigh 3.5 g Disperse the zinc nitrate in 100 mL of deionized water to form dispersion system B. Place the reactor containing dispersion system A in an ultrasonic disperser, and set the frequency of ultrasonic waves to 70 kHz. Add the above system B slowly to the system A, and stir continuously at a speed of 600 r / min. After the addition is complete, take the reaction vessel out of the ultrasonic disperser and let it stand for 2 h at room temperature. . The precipitate is filtered, washed with deionized water, dried in an oven at 95 ℃ for 2 h, and ground to obtain an organic-inorganic composite anticorrosive pigment. The anticorrosive pigment is added to the paint to make a paint film. The impedance test results show that the impedance value is as high as 1286ohm·cm at 7...

Embodiment 2

[0025] According to the molar ratio of zinc phosphate and benzotriazole of 2:1, weigh 3.0 g of sodium phosphate and 1.0 g of benzotriazole and disperse in 100 mL of deionized water to form dispersion system A; weigh 3.5 g Disperse the zinc nitrate in 100 mL of deionized water to form dispersion system B. Place the reactor containing dispersion system A in an ultrasonic disperser, and set the frequency of ultrasonic waves to 70 kHz. Add the above system B slowly to the system A, and stir continuously at a speed of 600 r / min. After the addition is complete, take the reaction vessel out of the ultrasonic disperser and let it stand for 2 h at room temperature. . The precipitate is filtered, washed with deionized water, dried in an oven at 95 ℃ for 2 h, and ground to obtain an organic-inorganic composite anticorrosive pigment. The anticorrosive pigment is added to the paint to make a paint film. The impedance test results show that the impedance value is as high as 1392ohm·cm at 7...

Embodiment 3

[0027] According to the molar ratio of zinc phosphate and benzotriazole of 3:1, weigh 3.0 g of sodium phosphate and 0.7 g of benzotriazole and disperse in 100 mL of deionized water to form dispersion system A; weigh 3.5 g Disperse the zinc nitrate in 100 mL of deionized water to form dispersion system B. Place the reactor containing dispersion system A in an ultrasonic disperser, and set the frequency of ultrasonic waves to 70 kHz. Add the above system B slowly to the system A, and stir continuously at a speed of 600 r / min. After the addition is complete, take the reaction vessel out of the ultrasonic disperser and let it stand for 5 hours at room temperature. . The precipitate is filtered, washed with deionized water, dried in an oven at 95 ℃ for 2 h, and ground to obtain an organic-inorganic composite anticorrosive pigment. The anticorrosive pigment is added to the paint to make a paint film. The impedance test results show that the impedance value is as high as 933.9ohm·cm...

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Abstract

The invention belongs to the technical field of inorganic chemistry and particularly relates to a one-step in-situ synthesis method for an organic and inorganic composite anticorrosive pigment. According to the one-step in-situ synthesis method, heat emitted when phosphate radical and zinc ions react to genera zinc phosphate is skillfully utilized for improving the temperature of a reaction system, so that the solubility of benzotriazole is greatly improved; the dissolved benzotriazole is attached to the surface of a zinc phosphate crystal nucleus to effectively inhibit growth of a zinc phosphate crystal, and the particle size is controlled in the nanometer level; when reaction between zinc nitrate and sodium phosphate is finished, the temperature of the reaction system is decreased, the solubility of benzotriazole is also reduced along with decreasing of temperature, benzotriazole is separated out from the system and firmly covers the surface of zinc phosphate nanocrystal, and finally the zinc phosphate / benzotriazole organic and inorganic composite anticorrosive pigment with the fixed composition and stable structure is obtained. The obtained product has the advantages of being good in dispersity, small in particle size, excellent in anticorrosive performance and the like.

Description

Technical field [0001] The invention belongs to the field of inorganic chemistry, and specifically relates to a one-step in-situ synthesis method of an organic-inorganic composite anticorrosive pigment. Background technique [0002] Metal corrosion phenomenon and its hazards widely exist in daily life and industrial production, and the direct economic loss caused by corrosion is quite huge. Generally, the main methods of controlling metal corrosion are: (1) Select corresponding metal materials according to different environments, and develop corrosion-resistant metal alloys; (2) Add a protective layer on the surface of the metal material to isolate the metal material from the corrosive environment; 3) Add corrosion inhibitors in the environment or on the surface of metal materials to slow down the rate of corrosion; (4) Use electrochemical methods to slow down or stop the corrosion rate to protect metal materials. Among the above anti-corrosion methods, the most economical, effe...

Claims

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Application Information

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IPC IPC(8): C09C1/04C09C3/08C09C3/04C09D5/08
CPCC09C1/046C09C3/006C09C3/041C09C3/043C09C3/08C09D5/082
Inventor 刘金库苗敏张婧玉王凤蕊沈娟苏玉云
Owner EAST CHINA UNIV OF SCI & TECH
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