Hardening film for in-mold decoration

Abstract

The invention discloses a hardening film for in-mold decoration. A transparent hardening coating is coated on the surface of a transparent base material, and then the surface of the transparent hardening coating is stamped; parallel strip bumps are formed on the surface of the transparent hardening coating; ultraviolet light irradiation is carried out from the other surface of the transparent base material when the surface of the transparent hardening coating is stamped; the transparent hardening coating is formed by curing a paint under ultraviolet irradiation, wherein the paint is prepared from the following components in parts by weight: 20-50 parts of high-functionality urethane acrylate prepolymer, 10-30 parts of hyperbranched modified acrylate prepolymer, 5-30 parts of bifunctionality activated monomer, 5-30 parts of multi-functionality activated monomer, 0.5-6 parts of photoinitiator and 1-3 parts of assistantr. By adopting the hardening film, the 'dazzling' pollution is well solved; the hardness and the flexibility are good in harmony; the demands of in-mold decoration on the product can be met; synchronous completion of solventless stamping and curing in the formula is achieved; the environmental pollution is avoided; and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the field of in-mold decoration (IMD), in particular to a 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, the printed decorative film is placed in the injection mold, and then the resin glue is injected into the mold. In the mould, thermocompression molding makes the decorative film and the injection molding material combined into one. The appearance of the product made by using in-mold decoration has a stronger sense of reality than that of the product formed by painting after injection molding, and the pattern does not have any adverse phenomena such as fading or falling off. It is widely used in the decoration of home appliances. Decorative and functional panels. [0003] In-mold decoration is currently a popular surface decoration technol...

AI Technical Summary

Problems solved by technology

[0004] Usually, the IMD products for indoor home appliance decoration are mainly high-gloss, transparent hardened film, but this kind of product often encounters "glare" pollution due to the reflection of the surface of the board when it is used in some places, such as outdoors or in environments with lights. , "glare" pollution seriously affects the visibility of IMD product patterns and product application fields

[0005] In order to solve the "glare" pollution, the usual technical means is to add anti-glare particles to the hardened coating, and the surface of the hardened film is matte through the diffuse reflection of the anti-glare particles on the surface light. However, due to the added anti-glare The particles and the coating resin material are not of the same type, and there is a certain difference in their refractive index. The anti-glare particles will cause a certain degree of refraction, large-angle scattering and absorption of the transmitted light, which will affect the light transmission performance of the hardened film and directly cause The clarity of the IMD printed pattern is not good, and there are problems such as incorrect color and opacity of the printed pattern; or the surface of the film body (that is, the substrate of the film) is brushed to achieve an anti-glare effect, but this will cause the film. A certain damage will make its scratch resistance, corrosion resistance, tensile resistance and other properties will drop a lot, so it is not suitable as a hardened film for IMD

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