Coating modification one-step in-situ synthesis method of calcium phosphate-based composition anti-corrosion pigment

An anti-corrosion pigment, calcium phosphate technology, applied in the field of environmental chemistry, can solve the problems of poor dispersibility of calcium phosphate particles and can not protect metal materials well, and achieves inhibition of crystal growth, reduction of production costs, and good compatibility. Effect

Inactive Publication Date: 2018-03-06
湖南众普化工新材料科技有限公司
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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 coating, it shows good system compatibility, and the resulting paint film has good adhesion to the substrate, which solves the problem of agglomeration due to too large calcium phosphate particles and poor dispersion, which makes it difficult to coat evenly. It is distributed on the surface of the metal substrate and other problems; the Ca-N bond formed in the one-step in-situ synthesis process forms a chelate to cover the surface of the metal substrate, making up for the shortcomings of inorganic anticorrosion that 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

[0021] According to the mass ratio of calcium phosphate to benzotriazole of 10:1, weigh 5.3 g of sodium phosphate, 1.0 g of benzotriazole, and 0.2 g of polyethylene glycol surfactant and disperse them in 100 mL of deionized water , to form dispersion system A; weigh 5.3 g of calcium nitrate and disperse it in 100 mL of deionized water to form dispersion system B. The reactor containing the dispersion system A was placed in an ultrasonic disperser, and the frequency of the ultrasonic wave was set to 100 kHz. Slowly add the above system B into system A dropwise, and keep stirring at a speed of 600 r / min. After the dropwise addition, take out the reaction vessel from the ultrasonic disperser, and let it stand and 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 a calcium phosphate-based composite anticorrosion pigment. The anti-corrosion pigment is added to the paint to make a p...

Embodiment 2

[0023] According to the mass ratio of calcium phosphate to benzotriazole of 20:1, 10.6 g of sodium phosphate, 1.0 g of benzotriazole, and 0.3 Tween surfactant were respectively weighed and dispersed in 100 mL of deionized water to form Dispersion system A; Weigh 10.6 g of calcium nitrate and disperse it in 100 mL of deionized water to form dispersion system B. The reactor containing the dispersion system A was placed in an ultrasonic disperser, and the frequency of the ultrasonic wave was set to 100 kHz. Slowly add the above system B into system A dropwise, and keep stirring at a speed of 600 r / min. After the dropwise addition, take out the reaction vessel from the ultrasonic disperser, and let it stand and 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 a calcium phosphate-based composite anticorrosion pigment. The anti-corrosion pigment is added to the paint to make a pain...

Embodiment 3

[0025] According to the mass ratio of calcium phosphate to benzotriazole of 30:1, weigh 15.9 g of sodium phosphate, 1 g of benzotriazole, and 0.4 g of triton x-100 surfactant and disperse them in 100 mL of Dispersion system A was formed in deionized water; 15.9 g of calcium nitrate was weighed and dispersed in 100 mL of deionized water to form dispersion system B. The reactor containing the dispersion system A was placed in an ultrasonic disperser, and the frequency of the ultrasonic wave was set to 100 kHz. Slowly add the above system B into system A dropwise, and keep stirring at a speed of 600 r / min. After the dropwise addition, take the reaction vessel out of the ultrasonic disperser, and let it stand and age for 5 h at room temperature. . The precipitate was filtered, washed with deionized water, dried in an oven at 95 °C for 2 h, and ground to obtain a calcium phosphate-based composite anticorrosion pigment. The anti-corrosion pigment is added to the paint to make a pa...

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PUM

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Abstract

The invention belongs to the technical field of environmental chemistry, and in particular relates to a coating modification one-step in-situ synthesis method of calcium phosphate-based composition anti-corrosion pigment. By adoption of the coating modification one-step in-situ synthesis method, a phosphate radical and calcium ions are cleverly utilized to perform reaction, and heat released by the process of generating calcium phosphate increases the temperature of a reaction system, so that the solubility of the benzotriazole and the solubility of a surface treating agent are greatly improved; and the dissolved benzotriazole and the dissolved surface treated agent are attached to the surface of a calcium phosphate crystal nucleus, the growth of a calcium phosphate crystal is effectivelyinhibited, the particle size is controlled to a nanometer scale, the added surfactant achieves the surface treating effect, and the compatibility of the anti-corrosion pigment and the coating system is improved; after the reaction of the calcium phosphate and sodium phosphate, the temperature of the reaction system is reduced, the solubility of the benzotriazole and the solubility of the surface treating agent are reduced along with the reduction of the temperature, the benzotriazole and the surface treating agent are separated out of the system and are firmly coated on the surface of the calcium phosphate nano-crystal, the calcium phosphate-based composite anti-corrosion pigment with fixed composition and a stable structure is finally obtained, and the obtained product has the characteristics of high dispersibility, small particle size, excellent corrosion resistance and the like.

Description

technical field [0001] The invention belongs to the field of environmental chemistry, and in particular relates to a one-step in-situ synthesis method for coating and modifying calcium phosphate-based 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. Among many anti-corrosion methods, the most economical, effective and widely used method is to add a protective layer on the surface of metal materials, that is, anti-corrosion pigment protection. [0003] According to the chemical composition of anti-corrosion pigments, anti-corrosion pigments are divided into the following types: (1) Phosphates and their modified anti-corrosion pigments. These anti-corrosion pigments have low toxicity and are environmentally friendly anti-corrosion pigments. Regarding the anti-corrosion mechanism of phosphate, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/08C09C3/10C09D5/08
CPCC09C1/02C09C3/006C09C3/08C09C3/10C09D5/084C09D5/086
Inventor 贺澄许宇峰黄云龙
Owner 湖南众普化工新材料科技有限公司
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