Preparation method of polyaniline dispersion

A technology of polyaniline and dispersion, applied in coatings, anti-corrosion coatings, etc., can solve problems such as poor dispersion and irregular shape of dispersed polyaniline, and achieve the goal of overcoming complicated steps, excellent dispersion performance, and increasing adhesion Effect

Pending Publication Date: 2021-08-17
ZHEJIANG TIANNU GROUP PAINT MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common water-based method of polyaniline mainly prepares water-soluble PAn derivatives by introducing sulfonic acid groups, carboxyl groups, and phosphoric acid groups on benzene rings or amino nitrogen atoms, and uses the hydrophilicity of acid groups to achieve the purpose of water-based polyaniline. The existing methods still have the problems of poor dispersion and irregular morphology of dispersed polyaniline

Method used

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  • Preparation method of polyaniline dispersion
  • Preparation method of polyaniline dispersion
  • Preparation method of polyaniline dispersion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] like figure 1 As shown, the preparation method of a polyaniline dispersion of the present invention includes:

[0027] (1) Accurately weigh 40 gpva and 0.8 g of urea, adding a four-mouth flask with 100 ml of deionized water at one time, warming up to 70 ° C, after dissolving, stirring 0.5 h, mixing it uniform, cooling to 40 ° C, add A 10 g of 85 wt% phosphoric acid was weighed, and the reaction was stirred at 40 ° C for 24 h, warmed to 90 ° C, stirring the reaction for 3 h, resulting in a yellow transparent viscous liquid, cooling the discharge.

[0028] (2) Accurately weigh the self-made P-PVA 4.7 g, add a flask containing 100 ml of deionized water, warmed to 80 ° C, stirring at high speed to P-PVA completely dissolved, fell to room temperature, 1-time addition of 3.8g, Stir for 1 h.

[0029] (3) Weighing 4.6 g of ammonium sulfate, 100 ml of hydrochloric acid (0.2 mol / L), magnetic stirring, fully dissolved, transferred to a constant pressure drip funnel, about 1 h, stirr...

Embodiment 2

[0032] A method of preparing a polyaniline dispersion, a method of composite modification, and the specific steps are as follows:

[0033] (1) Accurately weigh 40gPVA and 2G urea, adding a four-mouth flask with 100 ml of deionized water at a time, heating to 70 ° C, after dissolving, stirring 0.5 h, mix uniform, cooling to 40 ° C, adding The amount of 100 g 85 wt% phosphoric acid was stirred at 30 ° C for 24 h, warmed to 100 ° C, stirred for 2 h, resulting in a yellow transparent viscous liquid, cooling the discharge.

[0034] (2) Accurately weigh the self-made P-PVA 6g, add a flask containing 100 ml of deionized water, warmed to 70 ° C, stirring at high speed to P-PVA completely dissolved, minus to room temperature, 1 degrenes 6 g, stir 0.5 h.

[0035] (3) 6 g of ammonium sulfate, 100 ml of hydrochloric acid (0.2 mol / L), magnetic stirring, well dissolved, transferred to a constant pressure drip funnel, about 3 h, mixed, stirred at normal temperature for 24 h, to obtain ink gree...

Embodiment 3

[0037] A method of preparing a polyaniline dispersion, a method of composite modification, and the specific steps are as follows:

[0038] (1) Accurately weigh 40 gpva and 0.5 g of urea, adding a four-mouth flask with 100 ml of deionized water at one time, heating to 70 ° C, after dissolving, stirring 0.5 h, mixing, cooling to 50 ° C, add A 10 g 85 wt% phosphoric acid was known, stirred at 50 ° C for 24 h, warmed to 80 ° C, stirred for 4 h, resulting in yellow transparent viscous liquid, cooling the discharge.

[0039] (2) Accurately weigh the self-made P-PVA 4G, add 100ml deionized flask, temperature rise to 90 ° C, stirring at high speed to P-PVA completely dissolved, minus to room temperature, 1 degrene 3g, stirred 1.5 h.

[0040] (3) Weighing 3 g of ammonium persulfate, 100 ml of hydrochloric acid (0.2 mol / L), magnetic stirring, well dissolved, transferred to a constant pressure drip funnel, about 2 h, stirred at 30 ° C for 12 h, to obtain ink Green suspension, ie, a water-b...

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Abstract

The invention relates to a preparation method of a polyaniline dispersion, which comprises the following steps: preparing an acidic doped emulsifier P-PVA by using phosphoric acid modified polyvinyl alcohol, weighing 4-6 parts by weight of P-PVA, adding into 100 parts by weight of deionized water, heating to 70-90 DEG C, stirring until P-PVA is completely dissolved, cooling to room temperature, adding 3-6 parts by weight of aniline at one time, and stirring for 0.5-1.5 hours; and weighing 3-6 parts by weight of ammonium persulfate, adding 100 parts by weight of hydrochloric acid, stirring and dissolving, transferring into a constant-pressure dropping funnel, dropwise adding into the step (2) for 1-3 hours, and stirring for 12-24 hours at the temperature of 25-30 DEG C to obtain the phosphorylated aqueous polyaniline dispersion. Phosphoric acid groups are introduced through a chemical method, acid modification and water treatment are achieved, and meanwhile the adhesive force and the anti-corrosion function of the coating are improved; the acid and the polyvinyl alcohol jointly realize the water-based property of the polyaniline, so that the excellent dispersion property of the polyaniline is realized; and acid modification under the normal temperature condition is realized, and the step of ice-water bath modification in the existing method is overcome.

Description

Technical field [0001] The present invention relates to the preparation of aqueous polymethiline, and more particularly to a method of preparing a polyaniline dispersion. Background technique [0002] Polyaniline (PANI) not only has good thermal stability and environmental stability, but also has good corrosion resistance and scratch resistance, which can be used as a preservative additive to metal anti-corrosion. Both polyaniline in the two forms of the present pendulum and doped state are commonly used in the antiseptic coating, forming a mixed oxide layer with the metal, and the coating can still be quickly regenerated by the metal oxide layer, and then effectively protect the metal substrate. . However, polyaniline molecular chain ribs are rigid, large, not easy to process, insoluble in conventional organic solvents and water, so it is difficult to effectively disperse the coating, resulting in severe application of polyaniline in the field of coating. [0003] Water-based co...

Claims

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Application Information

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IPC IPC(8): C09D179/02C09D129/04C09D5/08C08F8/40C08F16/06C08G73/02
CPCC09D179/02C09D5/08C08F8/40C08G73/0266
Inventor 裴克梅董强杨立峰董群锋刘传奇沈建强
Owner ZHEJIANG TIANNU GROUP PAINT MFG
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