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One-step in-situ synthesis of organic-inorganic composite anticorrosion pigments

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: 2018-01-19
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 being 1:1, weigh 3.0 g of sodium phosphate and 1.3 g of benzotriazole and disperse them in 100 mL of deionized water to form dispersion system A; weigh 3.5 g The zinc nitrate was dispersed in 100 mL of deionized water to form dispersion B. The reactor containing the dispersion system A was placed in an ultrasonic disperser, and the frequency of the ultrasonic wave was set to 70 kHz. Slowly add the above system B into system A dropwise, and keep stirring at a speed of 600r / min. After the dropwise addition, the reaction vessel is taken out from the ultrasonic disperser, and left to age at room temperature for 2 h. The precipitate was filtered, washed with deionized water, dried in an oven at 95 °C for 2 h, and ground to obtain an organic-inorganic composite anti-corrosion pigment. The anti-corrosion pigment is added into the paint to make a paint film. The results of the impedance test show that the impedan...

Embodiment 2

[0025] According to the molar ratio of zinc phosphate and benzotriazole being 2:1, weigh 3.0 g of sodium phosphate and 1.0 g of benzotriazole and disperse them in 100 mL of deionized water to form dispersion system A; weigh 3.5 g The zinc nitrate was dispersed in 100 mL of deionized water to form dispersion B. The reactor containing the dispersion system A was placed in an ultrasonic disperser, and the frequency of the ultrasonic wave was set to 70 kHz. Slowly add the above system B into system A dropwise, and keep stirring at a speed of 600r / min. After the dropwise addition, the reaction vessel is taken out from the ultrasonic disperser, and left to age at room temperature for 2 h. The precipitate was filtered, washed with deionized water, dried in an oven at 95 °C for 2 h, and ground to obtain an organic-inorganic composite anti-corrosion pigment. The anti-corrosion pigment is added into the paint to make a paint film. The results of the impedance test show that the impedan...

Embodiment 3

[0027] According to the molar ratio of zinc phosphate and benzotriazole being 3:1, weigh 3.0 g of sodium phosphate and 0.7 g of benzotriazole and disperse them in 100 mL of deionized water to form dispersion system A; weigh 3.5 g The zinc nitrate was dispersed in 100 mL of deionized water to form dispersion B. The reactor containing the dispersion system A was placed in an ultrasonic disperser, and the frequency of the ultrasonic wave was set to 70 kHz. Slowly add the above system B into system A dropwise, and keep stirring at a speed of 600r / min. After the dropwise addition, the reaction vessel is taken out from the ultrasonic disperser, and left to age at room temperature for 5 hours. The precipitate was filtered, washed with deionized water, dried in an oven at 95 °C for 2 h, and ground to obtain an organic-inorganic composite anti-corrosion pigment. The anti-corrosion pigment is added to the paint to make a paint film. The impedance test results show that the impedance va...

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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 in particular relates to a one-step in-situ synthesis method of organic-inorganic composite anticorrosion pigments. Background technique [0002] The phenomenon of metal corrosion and its hazards widely exist in daily life and industrial production, and the direct economic losses caused by corrosion are quite huge. Generally, the main methods to control 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 metal materials to isolate the metal materials from the corrosive environment; ( 3) Add corrosion inhibitors to 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 econom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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徐婷
Owner EAST CHINA UNIV OF SCI & TECH
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