Scratching-resisting waterborne transfer coating

Abstract

The invention discloses a scratching-resisting waterborne transfer coating. The coating comprises the following components in percentage by weight: 15-50% of waterborne polyurethane, 5-35% of polycarbonate polyurethane, 3-15% of silicone-modified polyurethane, 1-10% of a coalescing agent, 0.05-0.8% of polyisocyanate, 0.01-0.3% of a wetting agent, 0.01-0.1% of a defoaming agent, 15-40% of a solvent, and 5-20% of a cosolvent. Compared with the prior art, the scratching-resisting waterborne transfer coating has the advantages of being proper in surface tension which is about 38, free from any adverse influence on later printing performance, high in hardness, and high in high-temperature resistance.

Description

technical field [0001] The invention belongs to the technical field of water-based transfer coatings, in particular to a scratch-resistant water-based transfer coating. Background technique [0002] The transfer coatings that are widely used in the flexible packaging industry are being forced to replace solvent-based products by water-based products due to the regulations on solvent tax and environmental protection. The process is that the transfer coating is first coated on the PET film, and then the transfer coating is bonded to the substrate through an adhesive, and finally the PET film is peeled off, and the surface of the transfer layer is then subjected to subsequent offset printing. Since it is necessary to prevent the transfer coating from being scratched by the rubber roller during the offset printing process and by the roller during paper feeding, the surface of the transfer layer needs to have a certain scratch resistance. [0003] There are many ways for solvent...

AI Technical Summary

Problems solved by technology

[0003] There are many ways to improve the scratch resistance of solvent-based coatings. For example, the Chinese invention patent publication No. CN101760116A "a kind of anti-scratch wood paint" uses methods such as adding silicone oil and wax powder, but such additives are not compatible with water-based transfer The paint has poor compatibility, which can easily cause bluishness and other conditions that affect the appearance of packaging materials

In the field of water-based transfer coatings, there are patents that add silicone-modified acrylic resin and water-soluble silica sol to the main resin to increase the surface slipperiness of the transfer layer, thereby improving the scratch resistance of the transfer coating, such as Chinese Invention Patent Publication No. It is CN105153844A's "high slipperiness water-based environmental protection transfer coating with transfer layer surface and preparation method", but the improvement of smoothness can only improve the scratch resistance to a limited extent, and is often accompanied by the reduction of surface tension, which will make transfer Decreased post-printing performance of films

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