Yellowing-resistant weak solvent inkjet coating and preparation method thereof

Abstract

The invention belongs to the field of coatings, and discloses a yellowing-resistant weak solvent inkjet coating which comprises the following raw materials in parts by weight: 30-40 parts of acrylic emulsion, 10-15 parts of a polyvinyl alcohol solution, 8-12 parts of silicon dioxide, 0.3-1 part of nano titanium dioxide sol, 0.1-0.4 part of a whitening agent, 0.05-0.08 part of a dispersing agent, 0.001-0.003 part of phthalo blue, 0.002-0.005 part of permanent violet and 40-50 parts of deionized water. The invention further discloses a preparation method of the inkjet coating. The preparation method comprises the steps of preparation of the polyvinyl alcohol solution, preparation of a whitening liquid, preparation of the inkjet coating and other steps. The inkjet coating provided by the invention is capable of adapting to different substrates, and has the advantages of high whiteness and yellowing resistance.

Description

Technical field [0001] The invention belongs to the field of coatings, in particular to a yellowing-resistant weak solvent inkjet coating and a preparation method thereof. Background technique [0002] Outdoor advertising has a rich visual impact and a high transmission rate. In recent years, it has developed rapidly. Inkjet outdoor pictures have the characteristics of individualization, waterproof materials, high printing accuracy, and wide application areas, which are becoming more and more popular. However, when advertising materials are used outdoors, they are more affected by exposure to external unstable factors than indoor materials. The ultraviolet rays in the environment will cause the color of the spray painting surface to fade, the surface fluorescent whitening effect will decline, the coating will become yellow, and the air will be mixed. The thermal oxidative aging effect intensifies the yellowing problem of the coating, and directly appears the embarrassing phenomen...

AI Technical Summary

Problems solved by technology

The middle of the PVC light box cloth is mesh cloth, and both sides are PVC. The material is thick and inconvenient to install. In order to meet the requirements of inkjet printing accuracy, the amount of anti-aging agent added to the material is limited. The PVC surface will crack, become brittle, and turn yellow when used outdoors for a long time

The PVC body can be pasted on the aging resistance by attaching a layer of cold lamination film on the surface. Although the weather resistance of the picture and materials is improved, the lamination process and production cost are increased.

Most of the existing weak solvent paint formulations add low-priced styrene-acrylic emulsions, which can reduce costs, but yellowing is prone to occur. In addition, whitening agents with sulfonated aromatic chromophores are added, which must be combined with hydroxyl-containing PVA Or the whitening effect can be stable and non-fading after CMC forms a complex, but the addition of PVA and CMC affects the water resistance and ink absorption of the coating, and outdoor use is limited. Usually, the proportion of PVA or CMC added is very small, resulting in the product only Adapt to the whiteness effect of short-term coatings, and the problem of fading and yellowing will appear after 3 days of outdoor use

There is also a combination of fluorescent whitening on the substrate and no whitening of the weak solvent coating on the market. The color of the coating does not change much without brightening, but the weak solvent coating does not have whitening, and the overall color of the product is yellowish. Yellowing will be slower

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