Black phenolic aldehyde modified epoxy coating and preparation method thereof

Abstract

The invention discloses a black phenolic aldehyde modified epoxy coating and a preparation method thereof. The black phenolic aldehyde modified epoxy coating is prepared from 8 to 10 parts of epoxy resin liquid, 0.4 to 1 part of carbon black, 1 to 6 parts of a phenolic resin liquid, 0.5 to 2 parts of a diluent, 0.4 to 0.8 part of talcum powder, 0.2 to 0.6 part of an amino resin and 2.5 to 5 partsof polyamide. The preparation method comprises following steps: introducing a colored paint into a paint tank according to a formula, and uniformly stirring; grinding until the fineness of an obtainedcolor paste is less than or equal to 20 microns; mixing black paint, a curing agent and the diluent according to a weight ratio of 4: 1: 5, uniformly stirring, pouring into a paint spraying cup of arolling spraying machine, spraying until the thickness of a single layer is 10<mu>m, wherein the viscosity of the diluent is 60-70 seconds, and the solid content is 55+ / -2%; and curing at 120 DEG C for 30 minutes, taking out an obtained product for an anti-corrosion test. The preparation method has the beneficial effects that the phenolic resin and the epoxy resin are selected for blending modification, so that an obtained paint film has good physical and mechanical properties and chemical medium corrosion resistance, and heat resistance, salt spray resistance and damp heat resistance are achieved.

Description

technical field [0001] The invention relates to the technical field of anti-corrosion coating for magnets, in particular to a black phenolic modified epoxy coating and a preparation method thereof. Background technique [0002] In the prior art, for the anti-corrosion coating of bonded NdFeB magnets, solvent-volatile two-component polyamide-cured epoxy coatings can achieve quite good anti-corrosion effects under ordinary air spraying and electrostatic spraying, but for spherical, For special-shaped magnets with extremely small volumes such as small tiles and tiny cylinders, ordinary air spraying cannot be used for coating at all, and only roller spraying can be used for anti-corrosion coating of magnets. However, due to the special spraying method of roller spraying, the general market The solvent-volatile polyamide-cured epoxy coating has poor resistance to salt spray and heat and humidity after rolling spraying, so we urgently need to modify this type of epoxy coating for ...

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Problems solved by technology

[0002] In the prior art, for the anti-corrosion coating of bonded NdFeB magnets, solvent-volatile two-component polyamide-cured epoxy coatings can achieve quite good anti-corrosion effects under ordinary air spraying and electrostatic spraying, but for spherical, For special-shaped magnets with extremely small volumes such as small tiles and tiny cylinders, ordinary air spraying cannot be used at all. The anti-corrosion coating of magnets can only be done by rolling spraying. However, due to the special spraying method of rolling spraying, it is generally commercially available The solvent-volatile polyamide-cured epoxy coating has poor resistance to salt spray and heat and humidity after rolling spraying, so we urgently need to modify this type of epoxy coating for rolling spraying to greatly improve the salt resistance of the magnet after rolling spraying Fog resistance to heat and humidity

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