Coal-based polyaniline and anti-corrosive paint

Abstract

The invention provides a method for preparing coal-based polyaniline. The method comprises the following steps: (1) feed coal is deashed and crushed until a particle size d97 is smaller than or equal to 20 micrometers, preferably, the particle size d97 is smaller than or equal to 10 micrometers, and ultra-fine coal powder with ultra-low ash content is obtained; (2) the ultra-fine coal powder with ultra-low ash content is mixed with aniline and a protonic acid solution, an initiator is added into the mixture, and then a mixture containing coal-based polyaniline in situ polymerization is obtained after a reaction; (3) the mixture is subjected to suction filtration and is washed and dried, and coal-based polyaniline is obtained. The invention further provides coal-based polyaniline prepared with the method, a method for preparing anti-corrosive paint through coal-based polyaniline and the anti-corrosive paint. The anti-corrosive paint prepared with the method has good film forming performance, durability, stability, good anti-corrosive effect and low cost.

Description

technical field

[0001] The invention relates to a coal-based polyaniline and a preparation method thereof, and also relates to an anti-corrosion coating prepared by using the coal-based polyaniline and a preparation method thereof. Background technique

[0002] Among various anti-corrosion technologies, coating anti-corrosion coatings is the most widely used, and also the most economical, practical and effective method. As a conductive polymer, polyaniline has been applied in the field of anti-corrosion coatings due to its easy availability of raw materials, excellent electrochemical properties and good chemical stability. The commonly used polyaniline anti-corrosion coating is to blend polyaniline with commonly used film-forming resin as a base material, and then add additives to make a composite coating. E.g:

[0003] Patent document CN102634276A discloses a polyaniline heavy-duty anti-corrosion coating, the preparation method of which is to firstly prepare polyaniline a...

Examples

Embodiment 1

[0067] Take Taixi anthracite, wash and deash, coarsely crush to a particle size of 97 ≤10μm, to obtain ultra-low ash ultra-fine coal powder. Aniline was purified by vacuum distillation to a purity higher than 95%. Premix ultra-low ash ultra-fine coal powder and aniline at a weight ratio of 3:7, mix with 1mol / L hydrochloric acid solution, stir ultrasonically and electrically for 0.5h in an ice-water bath at 4°C, then add ammonium persulfate solution dropwise, at 4°C Stirring was continued for 2.0 h under the ice-water bath, wherein the molar ratio of ammonium persulfate to aniline was 1:1, and the dropping time was controlled at 0.5 h. Remove the ice-water bath, perform electric stirring at room temperature, and control the total time of the above-mentioned electric stirring and magnetic stirring to 24 h. The obtained material was suction-filtered and washed, firstly dried at 60° C. under normal pressure for 4 hours, and then vacuum-dried at 60° C. for 24 hours to obtain coal-...

Embodiment 2

[0069] Take Taixi anthracite, wash and deash, coarsely crush to a particle size of 97 ≤10μm, to obtain ultra-low ash ultra-fine coal powder. Aniline was purified by vacuum distillation to a purity higher than 95%. Premix ultra-low ash Taixi anthracite and aniline at a weight ratio of 5:5, mix with 1mol / L hydrochloric acid solution, ultrasonically stir in an ice-water bath at 4°C and stir electrically for 0.5h, then add ammonium persulfate solution dropwise, at 4°C Continue electric stirring for 2.0 h under the ice-water bath, wherein the molar ratio of ammonium persulfate to aniline is 1:1, and the dropping time is controlled at 0.5 h, remove the ice-water bath, and carry out electric stirring at room temperature. The time is 30h. The obtained material was suction-filtered and washed, firstly dried at 60° C. under normal pressure for 8 hours, and then vacuum-dried at 60° C. for 24 hours to obtain coal-based polyaniline.

Embodiment 3

[0071] Take Jincheng anthracite, wash and deash, coarsely crush to a particle size of 97 ≤10μm, to obtain ultra-low ash ultra-fine coal powder. Aniline was purified by vacuum distillation to a purity higher than 95%. Premix ultra-low ash Taixi anthracite and aniline at a weight ratio of 6:4, mix with 1mol / L hydrochloric acid solution, ultrasonically stir in an ice-water bath at 4°C and stir electrically for 0.5h, then add ammonium persulfate solution dropwise, at 4°C Continue electric stirring for 2.0 h under the ice-water bath, wherein the molar ratio of ammonium persulfate to aniline is 1:1, and the dropping time is controlled at 0.5 h, remove the ice-water bath, and carry out electric stirring at room temperature. The time is 24h. The obtained material was suction-filtered and washed, firstly dried under normal pressure at 60° C. for 6 hours, and then vacuum-dried at 60° C. for 24 hours to obtain coal-based polyaniline.

technical field

[0001] The invention relates to a coal-based polyaniline and a preparation method thereof, and also relates to an anti-corrosion coating prepared by using the coal-based polyaniline and a preparation method thereof. Background technique

[0002] Among various anti-corrosion technologies, coating anti-corrosion coatings is the most widely used, and also the most economical, practical and effective method. As a conductive polymer, polyaniline has been applied in the field of anti-corrosion coatings due to its easy availability of raw materials, excellent electrochemical properties and good chemical stability. The commonly used polyaniline anti-corrosion coating is to blend polyaniline with commonly used film-forming resin as a base material, and then add additives to make a composite coating. E.g:

[0003] Patent document CN102634276A discloses a polyaniline heavy-duty anti-corrosion coating, the preparation method of which is to firstly prepare polyaniline a...

Examples

Embodiment 1

[0067] Take Taixi anthracite, wash and deash, coarsely crush to a particle size of 97 ≤10μm, to obtain ultra-low ash ultra-fine coal powder. Aniline was purified by vacuum distillation to a purity higher than 95%. Premix ultra-low ash ultra-fine coal powder and aniline at a weight ratio of 3:7, mix with 1mol / L hydrochloric acid solution, stir ultrasonically and electrically for 0.5h in an ice-water bath at 4°C, then add ammonium persulfate solution dropwise, at 4°C Stirring was continued for 2.0 h under the ice-water bath, wherein the molar ratio of ammonium persulfate to aniline was 1:1, and the dropping time was controlled at 0.5 h. Remove the ice-water bath, perform electric stirring at room temperature, and control the total time of the above-mentioned electric stirring and magnetic stirring to 24 h. The obtained material was suction-filtered and washed, firstly dried at 60° C. under normal pressure for 4 hours, and then vacuum-dried at 60° C. for 24 hours to obtain coal-...

Embodiment 2

[0069] Take Taixi anthracite, wash and deash, coarsely crush to a particle size of 97 ≤10μm, to obtain ultra-low ash ultra-fine coal powder. Aniline was purified by vacuum distillation to a purity higher than 95%. Premix ultra-low ash Taixi anthracite and aniline at a weight ratio of 5:5, mix with 1mol / L hydrochloric acid solution, ultrasonically stir in an ice-water bath at 4°C and stir electrically for 0.5h, then add ammonium persulfate solution dropwise, at 4°C Continue electric stirring for 2.0 h under the ice-water bath, wherein the molar ratio of ammonium persulfate to aniline is 1:1, and the dropping time is controlled at 0.5 h, remove the ice-water bath, and carry out electric stirring at room temperature. The time is 30h. The obtained material was suction-filtered and washed, firstly dried at 60° C. under normal pressure for 8 hours, and then vacuum-dried at 60° C. for 24 hours to obtain coal-based polyaniline.

Embodiment 3

[0071] Take Jincheng anthracite, wash and deash, coarsely crush to a particle size of 97 ≤10μm, to obtain ultra-low ash ultra-fine coal powder. Aniline was purified by vacuum distillation to a purity higher than 95%. Premix ultra-low ash Taixi anthracite and aniline at a weight ratio of 6:4, mix with 1mol / L hydrochloric acid solution, ultrasonically stir in an ice-water bath at 4°C and stir electrically for 0.5h, then add ammonium persulfate solution dropwise, at 4°C Continue electric stirring for 2.0 h under the ice-water bath, wherein the molar ratio of ammonium persulfate to aniline is 1:1, and the dropping time is controlled at 0.5 h, remove the ice-water bath, and carry out electric stirring at room temperature. The time is 24h. The obtained material was suction-filtered and washed, firstly dried under normal pressure at 60° C. for 6 hours, and then vacuum-dried at 60° C. for 24 hours to obtain coal-based polyaniline.

Images