Aqueous low-temperature hot-painting coating and preparation method thereof

Abstract

The invention discloses an aqueous low-temperature hot-painting coating and a preparation method thereof. The aqueous low-temperature hot-painting coating comprises the following components: in partsby weight, 10-50 parts of water, 1-10 parts of an organic alcohol solvent, 0.05-5 parts of an organosilicon light diffusing agent, 10-40 parts of a polyurethane-acrylate copolymer emulsion, 10-50 parts of an ethylene-vinyl acetate copolymer, 0.1-5 parts of a film-forming aid, 1-10 parts of an anti-sticking agent, 0-5 parts of a whitening agent, 0-5 parts of a defoamer and 0-5 parts of a wetting agent. The coating is painted on the surface of a substrate through a direct painting method, and drying and winding are conducted so as to complete painting; the product is suitable for a low-temperature hot-painting machine, can be adhered tightly to images formed through printing of water-based and oil-based ink, and has no wrinkles in the late stage, and the obtained coating has good yellowing resistance; the coating can be applied to PET, CPP, OPP and other different media, the coating has no adhesion at normal temperature, no release paper is needed for winding of a coated product, and a silicone oil layer is eliminated on the surface; and the coating has a good hot melt effect, and is especially suitable for low-temperature hot painting of heat-labile materials.

Description

technical field [0001] The invention belongs to the technical field of printing and decoration, and in particular relates to a water-based low-temperature thermal mounting paint and a preparation method thereof. Background technique [0002] In the printing and decoration industry, polypropylene (PP) advertising paper, photo paper, body stickers and other products are often spray-painted. After spray-painting, a layer of cold lamination film is usually attached to the surface to play the role of waterproof, scratch-resistant, and prolonging the use time. . The more common cold lamination films on the market mainly use back-adhesive composite technology to coat oil-based or water-based pressure-sensitive adhesive layers on paper or PET (polyethylene terephthalate) surfaces containing silicone oil, and dry the glue with The main material is laminated, and the main material components are mainly PVC (polyvinyl chloride), CPP, OPP (biaxially oriented polypropylene film). The o...

AI Technical Summary

Problems solved by technology

[0003] However, the oil-based pressure-sensitive adhesive layer used in cold lamination film contains rosin-type tackifying resin, and the tackifying resin used outdoors for a long time will age and cause the picture to turn yellow. When printing pictures with water-based ink, especially where the ink is heavy, it is easy to have the problem of not sticking firmly and wrinkling

At the same time, the lamination effect of the cold lamination film is highly dependent on the operating experience of the equipment and personnel. In the case of unbalanced pressure adjustment at both ends of the composite rubber roller and uncoordinated film tension by the personnel operation, cold lamination film will appear in the lamination. Wrinkled and deformed with the material, after 24 hours of storage, there will be earthworm-like arching of the cold lamination film layer, which will affect the use of the product and cause it to be scrapped and reworked

In addition, the thermoplastic layer of the card film PET material of the coil mainly uses the extrusion coating technology, and the thermoplastic rubber particles are melted and then poured on the PET. The melting temperature is as high as 300-400°C. The minimum heat-mounting temperature for the finished product is 140°C. , can only adapt to the lamination of color inkjet paper inkjet materials, and is not adaptable to the advertising inkjet materials widely used in the market with PP paper and PVC as the main material

Images