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Preparation method of polydopamine modified molybdenum disulfide composite epoxy powder coating

A technology of molybdenum disulfide and powder coatings, which is applied in powder coatings, epoxy resin coatings, anti-corrosion coatings, etc., and can solve problems such as affecting the dispersion of molybdenum disulfide, poor adhesion between molybdenum disulfide and epoxy resin powder coatings, and inconvenience

Pending Publication Date: 2021-11-12
潍坊东方钢管有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, molybdenum disulfide additives increase the wear resistance of powder coatings, but there are still many problems in the application of molybdenum disulfide in epoxy powder coatings
[0006] The adhesion of MoS2 to epoxy powder coatings is poor; moreover, due to the interfacial effect of MoS2, the agglomeration phenomenon of MoS2 nanosheets is susceptible in the coating, which greatly affects the Dispersion of molybdenum in the coating impairs the functioning of molybdenum disulfide
[0007] In summary, there are obviously inconveniences and defects in the actual use of the existing technology, so it is necessary to improve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] The invention provides a method for preparing polydopamine-modified molybdenum disulfide composite epoxy powder coating, comprising the following steps:

[0028] Surface modification of step 1 nanomolybdenum disulfide

[0029] Dissolving tris (TRIS) in deionized water, adjusting the pH to 8-8.7 with dilute hydrochloric acid, and ultrasonically treating after stirring to obtain a tris solution.

[0030] Molybdenum disulfide and absolute ethanol were added to the tris-hydroxymethylaminomethane solution for ultrasonic treatment to obtain mixed solution 1; then dopamine hydrochloride was weighed and added to the above mixed solution 1, and stirred for reaction after ultrasonic treatment. Centrifuge after stopping the reaction, wash with ethanol aqueous solution until neutral during centrifugation, freeze-dry, and grind to obtain black solid powder modified molybdenum disulfide.

[0031] The concentration of tris hydroxymethyl aminomethane solution is 7.5-8.5g / L. The conce...

Embodiment 1

[0041] Surface modification of step 1 nanomolybdenum disulfide

[0042] Dissolve tris at a concentration of 7.5 g / L in deionized water, adjust the pH to 8.1 with dilute hydrochloric acid, and perform ultrasonic treatment after stirring to obtain a tris solution.

[0043] Molybdenum disulfide and absolute ethanol were added to the tris-hydroxymethylaminomethane solution for ultrasonic treatment to obtain mixed solution 1; then dopamine hydrochloride was weighed and added to the above mixed solution 1, and stirred for reaction after ultrasonic treatment. Centrifuge after stopping the reaction, wash with ethanol aqueous solution until neutral during centrifugation, freeze-dry, and grind to obtain black solid powder modified molybdenum disulfide. The mass ratio of tris to molybdenum disulfide is 1.12:1, and the mass ratio of molybdenum disulfide to dopamine hydrochloride is 2.3:1.

[0044] Step 2 Modified molybdenum disulfide and epoxy resin premixed

[0045] The epoxy resin pow...

Embodiment 2

[0049] Surface modification of step 1 nanomolybdenum disulfide

[0050] Dissolve tris with a concentration of 8.0 g / L in deionized water, adjust the pH to 8.3 with dilute hydrochloric acid, and perform ultrasonic treatment after stirring to obtain a tris solution.

[0051] Molybdenum disulfide and absolute ethanol were added to the tris-hydroxymethylaminomethane solution for ultrasonic treatment to obtain mixed solution 1; then dopamine hydrochloride was weighed and added to the above mixed solution 1, and stirred for reaction after ultrasonic treatment. Centrifuge after stopping the reaction, wash with ethanol aqueous solution until neutral during centrifugation, freeze-dry, and grind to obtain black solid powder modified molybdenum disulfide. The mass ratio of tris to molybdenum disulfide is 1.2:1, and the mass ratio of molybdenum disulfide to dopamine hydrochloride is 2.4:1.

[0052] Step 2 Modified molybdenum disulfide and epoxy resin premixed

[0053] The epoxy resin po...

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Abstract

The invention is applicable to the technical field of composite epoxy powder coatings, and provides a preparation method of a polydopamine modified molybdenum disulfide composite epoxy powder coating. The preparation method comprises the steps of adding molybdenum disulfide and absolute ethyl alcohol into a tris (hydroxymethyl) aminomethane solution for ultrasonic treatment, then adding dopamine hydrochloride, centrifuging, freeze-drying and grinding to obtain modified molybdenum disulfide; enabling epoxy resin powder and modified molybdenum disulfide to be subjected to ball milling and mixing, and obtaining a pre-dispersion body; and enabling other components in the epoxy powder coating formula and the pre-dispersion body to be subjected to melt blending extrusion through double screws, cooling tabletting, smashing, sieving and grading, and finally obtaining the composite powder coating product. Therefore, the adhesion of molybdenum disulfide and the epoxy resin powder coating can be enhanced, the barrier effect of the powder coating is enhanced, the possibility that a corrosive medium permeates the coating is reduced, the surface of the magnesium-lithium alloy is coated with the powder coating, the corrosion resistance and wear resistance of the magnesium-lithium alloy can be improved, and the service life of the magnesium-lithium alloy is prolonged.

Description

technical field [0001] The invention relates to the technical field of composite epoxy powder coatings, in particular to a preparation method of polydopamine-modified molybdenum disulfide composite epoxy powder coatings. Background technique [0002] As an ultra-light alloy, magnesium-lithium alloy has important application prospects in the fields of automobile, telecommunications and aerospace due to its high specific toughness, excellent ductility, impact resistance, excellent damping coefficient and intrusion resistivity of high-energy particles. However, magnesium-lithium alloys are highly sensitive to corrosion, and the decomposition of lithium is difficult to prevent the continuous corrosion process due to the formation of loose powdery substances on the interface. Therefore, to improve the corrosion resistance and wear resistance of magnesium-lithium alloys, expand its It is very necessary to give full play to its advantages. [0003] Organic / inorganic hybrid coating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/03C09D5/08C09D7/62
CPCC09D163/00C09D5/033C09D5/08C08K2003/3009C08K9/08C08K9/04C08K3/30C08K7/00
Inventor 陈世波张育新孙从征赵霞杜光辉于志松薛国玉叶禹张梁
Owner 潍坊东方钢管有限公司