阅读说明：本技术 结构色油墨及其制备方法与应用 (Structural color ink and preparation method and application thereof ) 是由 陈广学 钟雨晗 贺政国 王青 陈奇峰 史志雄 于 2019-11-11 设计创作，主要内容包括：本发明涉及结构色油墨及其制备方法与应用。按质量百分数计,所述结构色油墨包括以下组分：颜料10％～15％、树脂20％～40％、溶剂50％～65％以及助剂2％～5％；所述颜料包括光变颜料和珠光颜料；所述树脂选自聚氨酯树脂、丙烯酸树脂及硝化棉液中的至少一种；所述溶剂选自醇类溶剂和/或酯类溶剂。所述结构色油墨为醇溶性油墨,绿色环保,抗沉淀性能和稳定性优异,而且具有较高的色纯度、柔和的变色效果、随角度变化具有变色和闪烁效果,在中高端包装的丝网印刷方面具有潜在的应用前景。(The invention relates to a structured color ink and a preparation method and application thereof. The structural color ink comprises the following components in percentage by mass: 10 to 15 percent of pigment, 20 to 40 percent of resin, 50 to 65 percent of solvent and 2 to 5 percent of auxiliary agent; the pigment comprises optically variable pigment and pearlescent pigment; the resin is at least one selected from polyurethane resin, acrylic resin and nitrocotton liquid; the solvent is selected from alcohol solvents and/or ester solvents. The structured color ink is alcohol-soluble ink, is green and environment-friendly, has excellent anti-precipitation performance and stability, has higher color purity, soft color change effect, color change and flicker effect along with angle change, and has potential application prospect in the aspect of screen printing of medium-high end packages.)

1. The structural color ink is characterized by comprising the following components in percentage by mass:

10 to 15 percent of pigment, 20 to 40 percent of resin, 50 to 65 percent of solvent and 2 to 5 percent of auxiliary agent;

the pigment comprises optically variable pigment and pearlescent pigment;

the resin is at least one selected from polyurethane resin, acrylic resin and nitrocotton liquid;

the solvent is selected from alcohol solvents and/or ester solvents.

2. The structured color ink according to claim 1, wherein the mass ratio of the pearlescent pigment to the optically variable pigment is 1-9: 1;

preferably, the grain size of the optically variable pigment is 5-10 μm, and the grain size of the pearlescent pigment is 5-100 μm.

3. The structured ink according to claim 1, wherein the solvent is a mixed solvent of an alcohol solvent and an ester solvent;

preferably, the alcohol solvent is selected from at least one of ethanol, isopropanol or cyclohexanone; the ester solvent is at least one selected from ethyl acetate, n-propyl acetate or ethylene glycol methyl ether acetate;

preferably, the solvent is a mixed solvent of isopropanol and ethyl acetate; more preferably, the mass ratio of isopropanol to ethyl acetate in the mixed solvent is 2: 1-1: 1.

4. The structural color ink of claim 1, wherein the resin is a polyurethane resin.

5. The structured ink of claim 1, wherein the auxiliary agent comprises from 0.5% to 1.5% anti-settling agent, from 0.5% to 1.5% erucamide, from 0.5% to 2% antifoaming agent, from 0.5% to 1% polyethylene micropowder wax, and from 0.5% to 1% dispersing agent.

6. A method of making the structured color ink of any one of claims 1 to 5, comprising:

and adding resin into the mixture of the pigment and the solvent according to the proportion, uniformly mixing, adding the auxiliary agent, and uniformly mixing again to obtain the structural color ink.

7. The method according to claim 6, wherein the process of obtaining a mixture of pigment and solvent is accompanied by a stirring operation;

the stirring speed is 300-500 rpm, the stirring time is 2-5 h, and the stirring temperature is 30-35 ℃.

8. The method according to claim 6, wherein the process of mixing homogeneously after adding the resin is accompanied by a stirring operation;

the stirring speed is 300-500 rpm, and the stirring time is 10-60 min.

9. The method according to claim 6, wherein the process of mixing uniformly after adding the auxiliary agent is accompanied by stirring operation;

the stirring speed is 300-500 rpm, and the stirring time is 4-6 h.

10. Use of a structured color ink according to any one of claims 1 to 5 in screen printing;

preferably, the mesh number of the screen printing is 100-200 meshes.

Technical Field

The invention relates to the field of printing ink, in particular to structural color printing ink and a preparation method and application thereof.

Background

With the development of economy and the improvement of living standard of people, the public has more and more demands on medium-high-end commodities. The accompanying counterfeiting behavior of the commodity is endless, and particularly in the fields of medicines, cosmetics, cigarettes and wines, the commodity counterfeiting behavior not only causes serious economic loss, but also endangers the physical health of consumers. Therefore, in order to accurately identify the authenticity of products, strike and stop counterfeiting, various anti-counterfeiting technologies are applied to industrial production. The research and development application of the pearlescent ink can improve the anti-counterfeiting degree of the package or the bill, thereby protecting the rights of merchants and consumers.

Patent document CN105273493A discloses a gravure pearlescent ink with excellent storability and a preparation method thereof, wherein the ingredients of the gravure pearlescent ink comprise a pearlescent pigment, styrene modified alkyd resin, maleic acid-acrylic acid-hydroxyethyl acrylate copolymer and ethyl acetate. Patent document CN103773105A discloses a pearlescent ink and its preparation method, wherein the ingredients comprise pearlescent powder, nitrocellulose resin, wetting dispersant, anti-settling agent, and n-propyl ester. However, the pigment in the pearlescent ink prepared by the above patent document method only contains pearlescent powder, and the discoloration effect is not significant.

Therefore, the research and development of the environment-friendly structured ink has more excellent light variation effect than the existing pearlescent ink, the light variation effect of the structured ink can be adjusted according to the requirement of a printing product, and the structured ink with better printability and better anti-precipitation performance has important practical significance and environmental benefit.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The first purpose of the invention is to provide a structural color ink, the pigments of the structural color ink comprise optically variable pigments and pearlescent pigments, a printed sample has high color purity, unique color change effect, obvious color change and flicker effect along with angle change, and the color change effect of the structural color can be adjusted according to the requirement of a printed product. Meanwhile, the ink is alcohol-soluble, has good solubility on structural color pigments, is green and environment-friendly, and has excellent anti-settling performance and stability, good glossiness of printed products and strong adhesion fastness.

The second purpose of the invention is to provide the preparation method of the structural color ink, which is simple and efficient, mild in condition, green and environment-friendly, capable of realizing large-scale production and wide in industrial production prospect.

The third purpose of the invention is to provide the application of the structural color ink in screen printing.

In order to achieve the above purpose of the present invention, the following technical solutions are adopted:

the structural color ink comprises the following components in percentage by mass:

10 to 15 percent of pigment, 20 to 40 percent of resin, 50 to 65 percent of solvent and 2 to 5 percent of auxiliary agent;

the pigment comprises optically variable pigment and pearlescent pigment;

the resin is at least one selected from polyurethane resin, acrylic resin and nitrocotton liquid;

the solvent is selected from alcohol solvents and/or ester solvents.

Optionally, the structural color ink is free of benzene.

Optionally, the resin is a polyurethane resin.

Optionally, the mass ratio of the pearlescent pigment to the optically variable pigment is 1-9: 1.

Optionally, the mass ratio of the pearlescent pigment and the optically variable pigment may be independently selected from 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, and ratios in a range between any of the foregoing.

Optionally, the particle size of the optically variable pigment is 5-10 μm, and the particle size of the pearlescent pigment is 5-100 μm.

Alternatively, the particle size of the optically variable pigment may be independently selected from the group consisting of 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, and ranges therebetween.

Alternatively, the particle size of the pearlescent pigment may be independently selected from the group consisting of 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, and ranges therebetween.

The grain sizes of the light-variable pigment (light-variable powder) and the pearlescent pigment (pearlescent powder) have great influence on the printing effect of the structural color ink, the printing product is fine and soft when the grain size is smaller, and the printing product has a flashing pearlescent effect when the grain size is larger.

Optionally, the solvent is a mixed solvent of an alcohol solvent and an ester solvent.

Optionally, the alcoholic solvent is selected from at least one of ethanol, isopropanol or cyclohexanone; the ester solvent is at least one selected from ethyl acetate, n-propyl acetate or ethylene glycol methyl ether acetate.

Optionally, the solvent is a mixed solvent of isopropanol and ethyl acetate.

Optionally, the mass ratio of isopropanol to ethyl acetate in the mixed solvent is 2: 1-1: 1.

In the invention, the solvent is a mixed solvent of an alcohol solvent and an ester solvent, and the material is convenient and easy to obtain and is green and environment-friendly.

Optionally, the auxiliary agent comprises 0.5-1.5% of anti-settling agent, 0.5-1.5% of erucamide, 0.5-2% of defoaming agent, 0.5-1% of polyethylene micro-powder wax and 0.5-1% of dispersing agent.

According to another object of the invention, a preparation method of the ink with any one of the structures is provided. The method comprises the following steps:

and adding resin into the mixture of the pigment and the solvent according to the proportion, uniformly mixing, adding the auxiliary agent, and uniformly mixing again to obtain the structural color ink.

Optionally, the process of obtaining a mixture of pigment and solvent is accompanied by a stirring operation; the stirring speed is 300-500 rpm, the stirring time is 2-5 h, and the stirring temperature is 30-35 ℃.

Optionally, the process of adding the resin and mixing uniformly is accompanied by stirring operation; the stirring speed is 300-500 rpm, and the stirring time is 10-60 min.

Optionally, the process of uniformly mixing after adding the auxiliary agent is accompanied by stirring operation; the stirring speed is 300-500 rpm, and the stirring time is 4-6 h.

As an embodiment of the present invention, the method includes:

(a) slowly pouring the pigment into a mixed solvent of isopropanol and ethyl acetate, and stirring for 3 hours to fully mix the pigment and the solvent;

(b) after the substances are fully mixed, adding resin into the mixed solution, and stirring for 30 min;

(c) and adding the anti-settling agent, the erucamide, the defoaming agent and the polyethylene micro-powder wax into the mixed solution while stirring, and stirring for 5 hours until the pigment, the solvent, the resin and the auxiliary agent are completely and uniformly mixed to obtain the structural color ink.

According to another object of the present invention, there is provided the use of any of the structural inks described above in screen printing.

Optionally, the mesh number of the screen printing is 100-200 meshes.

Compared with the prior art, the invention has the beneficial effects that:

(1) the structured ink provided by the invention has the advantages that the pigment comprises optically variable pigment and pearlescent pigment, the two pigments are compounded according to a certain proportion, the grain size of the optically variable pigment is 5-10 mu m, the grain size of the pearlescent pigment is 5-100 mu m, the grain sizes of the optically variable pigment and the pearlescent pigment have great influence on the printing effect of the structured ink, the printed product is fine and soft when the grain size is smaller, and the printed product has a flashing pearlescent effect when the grain size is larger; and the structural color ink can be blended into different excellent light variation effects according to the requirements of printing products, and has higher practical value.

(2) The structured color ink provided by the invention is alcohol-soluble, is environment-friendly, has excellent anti-settling performance and stability, has higher glossiness, excellent adhesion fastness and friction resistance, higher color purity, soft color change effect, color change and flicker effect along with angle change, and has potential application prospect in the aspect of screen printing of middle and high-end packages.

(3) The preparation method of the structural color ink provided by the invention is simple, efficient, mild in condition, green and environment-friendly, does not need expensive chemical materials or complex large-scale instruments, can realize large-scale production, and has a wide industrial production prospect.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a diagram illustrating the varying light effects at different angles of a pattern formed by screen printing a structured ink in accordance with one embodiment of the present invention;

FIG. 2 is a graph showing the varying light effects at different angles of a pattern formed by screen printing a structured ink according to another embodiment of the present invention;

FIG. 3 is a graph of the light variation effect at different angles of a pattern formed by screen printing a structured ink according to another embodiment of the present invention;

FIG. 4 is a graph of the varying light effect at different angles of a pattern formed by screen printing a structured ink in accordance with another embodiment of the present invention;

FIG. 5 is a diagram illustrating the light variation effect at different angles of a pattern formed by screen printing a structured ink according to another embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.