Low-temperature baking polyurethane (PU) plastic cement paint and preparation method thereof

Abstract

The invention discloses a low-temperature baking plastic cement paint, which comprises a component A and a component B, wherein the component A comprises 150 to 200 weight parts of high-hydroxy acrylic acid resin, 200 to 250 weight parts of low-hydroxy acrylic acid resin, 200 to 250 weight parts of quick-drying hydroxy acrylic acid resin, 100 to 150 weight parts of modified thermosetting acrylic acid resin, 10 to 15 weight parts of settling agent, 10 weight parts of drier, 1 to 5 weight parts of flatting agent, solvent of 150 to 200 weight parts of solvent and 100 to 150 weight parts of silver powder; and the component B comprises 680 weight parts of aliphatic isocyanate and 320 weight parts of butyl acetate. The preparation method comprises: (1) adding the previous four components, adding the anti-settling agent with slow machine stirring, and preparing a mixture by stirring; (2) soaking the silver powder in the solvent for 4 hours; (3) adding the soaked silver powder into the mixture, and uniformly stirring while adding the soaked silver powder; and (4) diluting according to a ratio of the component A to the component B to the diluent of 5:1:(3-5), spraying the paint on a plastic piece, and baking at low temperature on a production line. In the invention, when baked and cured at a low temperature, the product dries quickly and has high hardness, high adhesion force, high solvent resistance and high wear resistance.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a low-temperature baking type PU two-component plastic paint and a preparation method thereof. Background technique [0002] PU two-component plastic paint, generally used in plastic parts of notebook computers. [0003] The plastic parts of notebook computers have very strict requirements on the paint film, and the specific properties are as follows: color, color difference, compared with the standard sealed sample color board, there is no obvious visually visible color difference; color difference requirements (D65 light source): ΔL=±1.0, Δa =±0.5, Δb=±0.5, ΔE≤1.0 (according to CIE calculation); Mitsubishi Uni pencil, with a tip load of 500g, is required to be tested on a flat board. No residual scratches on the surface, hardness requirement: ≥H. Safety and sanitation, refer to the EU Directive on the Restriction of the Use of Certain Hazardous Substance...

AI Technical Summary

Problems solved by technology

[0004] The PU two-component plastic paint of the plastic parts of the notebook computer used in the market has poor impact resistance. To paint the battery cover of the notebook computer, it is necessary to spray the primer first, and then spray the topcoat. The process is complicated