Anti-ultraviolet transparent hard coating film for in-mold decoration (IMD)

Abstract

The invention relates to an anti-ultraviolet transparent hard coating film for in-mold decoration (IMD), which is formed by coating a transparent hard coating on a transparent substrate. The transparent hard coating comprises the following components in part by weight: 20 to 40 parts of polyester acrylate oligomer, 10 to 30 parts of organic-inorganic hybrid oligomer, 0.5 to 5 parts of ultraviolet absorption precursor, 1.0 to 10 parts of hydrogen proton donor, 0.5 to 7 parts of photoinitiator, 0.5 to 7 parts of active amine, 0.05 to 2 parts of leveling agent and 30 to 70 parts of solvent, wherein the thickness of the hard coating is 2 to 6mu m. The anti-ultraviolet transparent hard coating film solves the problems of ageing, yellowing, embrittlement and the like of a product irradiated by ultraviolet rays, solves the problems of oxygen inhibition and hydrogen proton consumption and ensures the formation of an ultraviolet absorbent; and the film meets the requirements of the IMD on forming and stretching by combining raw materials and controlling the thickness of the hard coating, and the stretching and forming height of the film can be 7 to 8mm at most but the film cannot be embrittled.

Description

technical field [0001] The invention belongs to the technical field of in-mold decoration (IMD), in particular to an anti-ultraviolet transparent cured film for in-mold decoration. Background technique [0002] In-mold decoration (IMD) refers to the process of forming a decorative pattern on the surface of the product when the product is injection molded in the mold. Generally, a film with a decorative pattern is formed in advance, and then the film with a decorative pattern is formed. Thermoforming to form a predetermined shape, the film is cut and then placed in the cavity of the injection molding mold, preferably molten material is injected into the cavity, the film is combined with the molten material to form a product with a decorative pattern. The appearance of products made by in-mold decoration has a stronger sense of reality than products that are patterned by painting after injection molding, and the pattern does not have any adverse phenomena such as fading or fal...

AI Technical Summary

Problems solved by technology

However, the usual high-hardness hardened film is brittle and difficult to meet the forming tensile properties of IMD. How to better balance the contradictory properties of formability and surface hardness has become the key to IMD industry technology.

[0005] In addition, in some occasions, such as IMD products such as automobiles and outdoors, which are often exposed to sunlight, long-term exposure to ultraviolet light will cause aging, yellowing or even embrittlement of IMD products.

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