Double-layer solid film pre-coated on surface of stamp-forming sheet and preparation method of double-layer solid film

Abstract

The invention discloses a double-layer solid film pre-coated on the surface of a stamp-forming sheet and a preparation method of the double-layer solid film. The double-layer solid film comprises an organic lubrication layer coated on the surface of an aluminum alloy sheet and a protective layer coated on the surface of the organic lubrication layer; the organic lubrication layer comprises a lubrication performance endowing agent A, an organic coating B served as a lubrication endowing agent binder and a wetting dispersant C for improving the dispersity of the lubrication performance endowingagent A; the protective layer is an organic coating D for improving the acid-base corrosion resistance of the organic lubrication layer. The preparation method comprises the following steps: firstly,adding the lubrication endowing agent A and the wetting dispersant C into the organic coating B, uniformly mixing and coating a mixture on the surface of a to-be-lubricated material, and carrying outnatural surface drying to form the organic lubrication layer; then coating the organic coating D served as the protective layer on the organic lubrication layer to form the double-layer solid film. The double-layer solid film disclosed by the invention has the advantages of being high in acid-base corrosion resistance, weather resistance, and lubrication performance, and easy to remove after stamping; in addition, the surfaces of the sheet and a mold are protected and formed parts have excellent surface quality.

Description

technical field [0001] The invention belongs to the auxiliary technical field of stamping and forming of aluminum alloy plates, relates to a surface lubricating film for stamping and forming of aluminum alloy plates, and in particular relates to a double-layer solid film pre-coated on the surface of stamping and forming plates and a preparation method thereof. Background technique [0002] Due to the special requirements for strength, formability, surface accuracy, bake hardening, etc. of automotive aluminum sheet coverings, the lubrication process in the simple transplanting of the original steel sheet stamping is very prone to defects, which not only cannot meet the manufacturing requirements, but also bring resources. waste and environmental pollution. At present, countries all over the world are strengthening the basic research on the surface treatment of aluminum alloy sheets for vehicles and lubricating materials, and have formed a series of lubricating material produc...

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Problems solved by technology

[0004] However, in the current invention of solid lubricants for stamping aluminum alloy sheets, these problems have not been fully considered

For example, CN100509181C discloses a resin lubricating film containing polyethylene glycol and paraffin. Although the lubricating film can provide better stamping lubrication performance, the preparation process is relatively complicated, which is not conducive to large-scale industrial production, and the resin after stamping is finished. Alkaline solution must be used to remove

However, the aluminum alloy is very easy to react chemically with the alkali solution, which will cause corrosion on the surface of the formed part and affect the surface quality of the formed part.

In addition, the patent does not describe the dispersion of the lubricating agent

CN102808169A discloses a method for lubricating aluminum alloys. On the basis of the phosphating treatment of aluminum alloys, the method is placed in fatty sodium to form a layer of sodium stearate as a lubricant, although the method improves the phosphating layer and the matrix binding force, but the processing method is more complex and cumbersome, and the stamping lubrication performance of processing aluminum alloys has not been evaluated in depth

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