Self-extinction resin emulsion and preparation method thereof, and application of self-extinction resin emulsion in water-based matte ink

Abstract

The invention discloses a self-extinction resin emulsion. The self-extinction resin emulsion comprises the following components in parts by mass: 5 to 10 parts of polycarbonate polyol, 20 to 30 partsof diisocyanate, 5 to 15 parts of pimaric acid modified polyol, 20 to 25 parts of a carboxylic acid type chain extender, 3 to 6 parts of a neutralizer, 40 to 60 parts of deionized water and 1.0 to 2.0parts of an auxiliary agent. The invention further discloses a preparation method of the self-extinction resin emulsion and application of the self-extinction resin emulsion in water-based matte ink.The obtained self-extinction resin emulsion is good in stability and low in viscosity and is applied to water-based matte ink; an obtained water-based matte ink layer has scratch resistance of largerthan 200 g, alcohol resistance of larger than 300 times and surface energy of larger than or equal to 56 mN / m, presents excellent reprinting performance and is quite suitable for being applied to thefield of packaging of 3C products.

Description

technical field [0001] The invention relates to the packaging field of 3C products, in particular to a self-dulling resin emulsion, a preparation method and its application in water-based matte ink. Background technique [0002] Matte ink, also known as varnish, is generally composed of resin, solvent and filler for matting. It is coated on the colored printing layer or directly on the substrate to adjust gloss, color difference, and improve surface properties. At the same time, it also protects the underlying material to a certain extent, avoiding product appearance defects caused by scratches and abrasions during production and transportation. The printing of matte ink is on the surface of 3C products. The packaging field is widely used. [0003] Traditional matte inks often use silica or wax powder as a matting filler, which floats to the surface of the printing layer after the matte ink dries on the substrate to reduce the gloss. Matting fillers are insoluble in solven...

AI Technical Summary

Problems solved by technology

Matting fillers are insoluble in solvents and exist in the form of a suspension in the resin solution, and are prone to agglomeration in the ink tank; affected by temperature, wind speed, and solvent volatilization during the drying process of the matte ink layer, the degree of filler floating is different , resulting in uneven gloss; after the matte ink dries, the matting filler accumulates on the surface of the matte ink layer, the structure is hollow, and it is easy to produce traces after being squeezed by external force, which affects the appearance of the product; in addition , the benzene, ketone, and ester solvents used in traditional matte oils are extremely volatile, have a pungent smell and are poisonous to the human body to varying degrees. During the drying process, the solvents volatilize into the air and will seriously damage the environment. In line with national environmental protection requirements

[0004] Water-based matte oils that do not contain solvents harmful to the human body and the environment are gradually appearing on the market. Water-based matte inks that achieve a matting effect by adding matting fillers still fail to solve the problems existing in the use of matte inks and after drying. Alcohol is also worse than oily matte ink

[0005] Patent CN110183611A discloses a water-based polyurethane self-dulling resin and its preparation method. The self-dulling resin prepared by this method is applied to printing paste, and the obtained matte ink layer has low matteness, bending resistance and aging resistance; The emulsion is mainly attached to the textile through osmotic absorption. It has low adhesion on the surface of non-polar substrates such as PE, PP, PI or polar substrates with poor permeability, and is easy to fall off. At the same time, the gloss is too low to be adjusted, and it is impossible to adjust the gloss to the required range when it is applied to the packaging and printing of 3C products, and it is difficult to meet the requirements for alcohol resistance and scratch resistance.

[0006] Patent CN109796574A mentions a self-dulling resin, which has strong toughness and adhesion after being coated on the plastic surface, and the introduction of organic silicon improves the smoothness of the matte ink layer, thereby enhancing the matte finish. Scratch resistance of ink layer; patent CN108384373A also mentioned a kind of water-based matte ink and its preparation method, modified polyurethane with epoxy resin, then added solvent and auxiliary agent to obtain a kind of water-based matte ink, the water-based matte The ink has good adhesion, scratch resistance, and excellent alcohol resistance on the film substrate. Its scratch resistance and adhesion are achieved through the introduction of various additives; however, the above two patents introduce organic compounds with different functions. Silicon, which makes the surface energy of the matte ink layer low after drying, and the reprintability is small, which seriously limits the application in the field of 3C product packaging