Soybean ink with bright color and flat printing and preparation method thereof

Abstract

The invention provides soybean ink which is bright in color and flat in printing. The printing ink is prepared from the following raw materials in parts by weight: 30-35 parts of pigment, 30-35 parts of epoxidized soybean oil, 15-20 parts of polyester modified acrylic resin, 10-15 parts of linear phenolic resin, 4-6 parts of acrylic acid modified alkyd resin, 15-20 parts of filler, 10-15 parts of solvent, 2-4 parts of polyethylene wax, 1-2 parts of surfactant, 0.5-1 part of ionic liquid, 0.5-1 part of slow drying agent, 0.5-1 part of drying agent and 0.5-1 part of gel. The filler is a blend of nano calcium carbonate and organic montmorillonite in a weight ratio of 3: 1; the solvent is a blend of isoamyl acetate and butanol in a weight ratio of 2: 1. The soybean ink disclosed by the invention is good in flowing property, moderate in drying speed and relatively good in adhesive force with printed paper in a printing process, and the color is bright and flat after printing. The invention also provides a preparation method of the soybean ink.

Description

Technical Field

[0001] The invention relates to environmentally friendly printing ink and a preparation method thereof, in particular to bright-colored, smooth-printing soybean ink and a preparation method thereof. Background Art

[0002] Generally, printing ink is a slurry colloid composed of a uniform mixture of colorants, binders, fillers and other ingredients. As a viscous fluid, ink has different properties due to its different varieties, that is, there are differences in thickness, viscosity, fast drying and slow drying. Ink is a substance used to form graphic information in the printing process. It directly determines the gradation, color and clarity of the image on the printed product, so it plays a huge role in the printing process. Soybean ink is a relatively environmentally friendly ink and is widely used in the printing of packaging paper products. However, some inks have poor fluidity and fast drying speed. When the edge ink in the ink fountain forms a film due to surface drying during the printing process, the film is easy to adhere to the roller, resulting in uneven layout, which leads to the pollution of random knife marks on the printed product. In addition, although some existing soybean inks are more environmentally friendly, the color after printing is not bright enough, and the overall color is dull, which cannot arouse the visual beauty of consumers. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a soybean ink, which has good ink flowability during printing, moderate drying speed, good adhesion to the printed paper, and bright and smooth color after printing. The present invention also provides a method for preparing the above soybean ink.

[0004] The technical solution of the present invention is achieved in this way:

[0005] The soybean ink with bright colors and smooth printing is made of the following raw materials in parts by weight: 30-35 parts of pigment, 30-35 parts of epoxy soybean oil, 15-20 parts of polyester modified acrylic resin, 10-15 parts of linear phenolic resin, 4-6 parts of acrylic acid modified alkyd resin, 15-20 parts of filler, 10-15 parts of solvent, 2-4 parts of polyethylene wax, 1-2 parts of surfactant, 0.5-1 part of ionic liquid, 0.5-1 part of retarder, 0.5-1 part of desiccant and 0.5-1 part of gelling agent; the filler is a blend of nano calcium carbonate and organic montmorillonite in a weight ratio of 3:1; the solvent is a blend of isoamyl acetate and butanol in a weight ratio of 2:1.

[0006] Furthermore, the ionic liquid is acetic acid-3-methylimidazolium hexafluorophosphate.

[0007] Furthermore, the desiccant is copper octoate.

[0008] Furthermore, the slow-drying agent is butyraldehyde.

[0009] Furthermore, the surfactant is a blend of polysorbate and starch phosphate in a weight ratio of 1:1.

[0010] Furthermore, the gelling agent is aluminum distearate.

[0011] Furthermore, the pigment includes black pigment and color pigment; the black pigment is carbon black, and the color pigment is phthalocyanine blue, permanent red, light-fast red and permanent yellow.

[0012] The method for preparing the environmentally friendly soybean ink with bright color and smooth printing provided by the present invention comprises the following steps:

[0013] S1. First, stir and heat the formulated amount of epoxy soybean oil to 170-180° C., add the formulated amount of polyester modified acrylic resin, linear phenolic resin, and acrylic acid modified alkyd resin in batches, stir and mix evenly, and continue stirring at a constant temperature for 20-30 minutes to obtain a mixture A;

[0014] S2, the mixture A obtained in step S1 is cooled to 110-120° C., a formulated amount of polyethylene wax is added, then cooled to 60-70° C., isoamyl acetate, butanol and ionic liquid are added, stirred for 10-15 min, then cooled to 35-40° C., a formulated amount of filler is added, stirred at a constant temperature for 20-30 min, then a formulated amount of pigment is added, stirred at a constant temperature for 40-50 min, to obtain a mixture B;

[0015] S3. Grind the mixture B obtained in step S2 with a grinding device until the fineness reaches less than 13 μm, then heat the mixture to 35-40° C., add the formulated amount of surfactant, slow-drying agent, desiccant and gelling agent, continue stirring for 30-40 minutes, and cool to room temperature to obtain a soybean ink product.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The resin of the invention adopts a compound of polyester modified acrylic resin, linear phenolic resin and acrylic acid modified alkyd resin, which are mixed in a certain proportion and combine the advantages of the three, so that the mixed resin is more suitable for printing with soybean ink, and the prepared ink has uniform color mixing and good adhesion.

[0018] In addition, the present invention adds a solvent of isoamyl acetate and butanol blend, as well as an ionic liquid and a surfactant, so that the fluidity of the ink is enhanced, and the addition of a slow-drying agent delays the curing time of the ink. The ink is generally prevented from being cured at the edge and the upper layer of the ink in the ink fountain after being put on the machine, and further prevents the cured ink from causing scratches and uneven surfaces on printing. The addition of the ionic liquid adjusts the interfacial tension and wettability of the ink, so that the fluidity of the ink is better, the color is more uniform after the ink is mixed, and the printing is more docile and smooth, and the degree of deformation in the drying process is reduced, and there is also the advantage of reducing static electricity, which is conducive to the subsequent laminating process.

[0019] The filler of the present invention adopts a blend of nano calcium carbonate and organic montmorillonite in a weight ratio of 3:1. On the one hand, the filler can not only play a role in adjusting the viscosity, fluidity and yield value of the ink, but also play a role in adjusting the ink concentration, that is, when the ink concentration and color are too dark, the filler can be added to achieve a diluting effect. On the other hand, the intercalation structure of the nano filler can improve the connection with the resin, further improve the mechanical properties and stiffness of the ink, and make the color of the ink appear brighter. The organic montmorillonite is montmorillonite treated with hexadecyl or octadecyl trimethyl quaternary ammonium salt, and a cation exchange reaction occurs, so that the organic group covers the montmorillonite surface or inserts into its interlayer, so that its surface energy changes, the interlayer distance is increased, and the montmorillonite is converted from the original hydrophilicity to the lipophilicity, and can be mixed evenly in the soybean ink.

[0020] The various components of the soybean ink formula of the present invention complement each other and form an inseparable whole. The addition of other additives also adjusts the indexes of the ink, making the overall performance of the ink better, showing the characteristics of bright color and smooth printing. DETAILED DESCRIPTION

[0021] In order to better understand the technical content of the present invention, specific embodiments are provided below to further illustrate the present invention.

[0022] The embodiment of the present invention is to select several groups of data for experiment according to the weight range of the brightly colored and smooth printed soybean ink components:

[0023] The soybean ink with bright colors and smooth printing is made of the following raw materials in parts by weight: 30-35 parts of pigment, 30-35 parts of epoxy soybean oil, 15-20 parts of polyester modified acrylic resin, 10-15 parts of linear phenolic resin, 4-6 parts of acrylic acid modified alkyd resin, 15-20 parts of filler, 10-15 parts of solvent, 2-4 parts of polyethylene wax, 1-2 parts of surfactant, 0.5-1 part of ionic liquid, 0.5-1 part of retarder, 0.5-1 part of desiccant and 0.5-1 part of gelling agent; the filler is a blend of nano calcium carbonate and organic montmorillonite in a weight ratio of 3:1; the solvent is a blend of isoamyl acetate and butanol in a weight ratio of 2:1.

[0024] The method for preparing bright-colored and smooth-printing soybean ink provided by the present invention comprises the following steps:

[0025] S1. First, stir and heat the formulated amount of epoxy soybean oil to 175° C., add the formulated amount of polyester modified acrylic resin, linear phenolic resin, and acrylic acid modified alkyd resin in batches, stir and mix evenly, and continue stirring at a constant temperature for 25 minutes to obtain a mixture A;

[0026] S2, the mixture A obtained in step S1 is cooled to 115° C., a formula amount of polyethylene wax is added, then cooled to 65° C., isoamyl acetate, butanol and ionic liquid are added, stirred for 15 min, then cooled to 35° C., a formula amount of filler is added, stirred at a constant temperature for 30 min, then a formula amount of pigment is added, stirred at a constant temperature for 50 min, to obtain a mixture B;

[0027] S3. Grind the mixture B obtained in step S2 with a grinding device until the fineness reaches less than 13 μm, then heat the mixture to 40° C., add the formulated amount of surfactant, slow-drying agent, desiccant and gelling agent, continue stirring for 40 minutes, and cool to room temperature to obtain a soybean ink product.

[0028] In order to reduce variables, the following examples and comparative examples all use weight parts: 30 parts of pigment, 35 parts of epoxy soybean oil, 3 parts of polyethylene wax, 1.5 parts of surfactant, 0.5 parts of slow drying agent, 0.5 parts of drying agent, and 0.5 parts of gelling agent. The remaining components are added according to the weight parts in Table 1, and the product is obtained strictly according to the preparation method of the above soybean ink.

[0029] Table 1: Examples and Comparative Examples. Other components by weight.

[0030]

[0031] The soybean inks prepared in Examples 1-2 and Comparative Examples 1-2 were tested for performance, and the test results are shown in Table 2:

[0032] Table 2 Performance test results of the embodiments and comparative examples

[0033]

[0034]

[0035] Note: There are 9 color grades, namely 1, 1-2, 2, 2-3, 3, 3-4, 4, 4-5, and 5, among which 5 is the best grade and 1 is the worst grade.

[0036] From the results in Table 2, it can be seen that the soybean ink prepared in Examples 1-2 of the present invention has bright color, good fluidity and viscosity, the ink is not easy to form a film on the machine, and the printing is smooth and beautiful.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Bright color and smooth printing soybean ink, characterized by: The invention is prepared from the following raw materials in parts by weight: 30-35 parts of pigment, 30-35 parts of epoxy soybean oil, 15-20 parts of polyester modified acrylic resin, 10-15 parts of linear phenolic resin, 4-6 parts of acrylic acid modified alkyd resin, 15-20 parts of filler, 10-15 parts of solvent, 2-4 parts of polyethylene wax, 1-2 parts of surfactant, 0.5-1 part of ionic liquid, 0.5-1 part of slow drying agent, 0.5-1 part of drying agent and 0.5-1 part of gelling agent; the filler is a blend of nano calcium carbonate and organic montmorillonite in a weight ratio of 3:1; the solvent is a blend of isoamyl acetate and butanol in a weight ratio of 2:

1.

2. The brightly colored, smooth-printing soybean ink according to claim 1, characterized in that: The ionic liquid is acetic acid-3-methylimidazolium hexafluorophosphate.

3. The brightly colored, smooth-printing soybean ink according to claim 2, characterized in that: The desiccant is copper octoate.

4. The brightly colored, smooth-printing soybean ink according to claim 3, characterized in that: The slow-drying agent is butyraldehyde.

5. The brightly colored, smooth-printing soybean ink according to claim 4, characterized in that: The surfactant is a blend of polysorbate and starch phosphate in a weight ratio of 1:

1.

6. The brightly colored, smooth-printing soybean ink according to claim 5, characterized in that: The gelling agent is aluminum distearate.

7. The brightly colored, smooth-printing soybean ink according to claim 1, characterized in that: The pigments include black pigments and color pigments; the black pigment is carbon black, and the color pigments are phthalocyanine blue, permanent red, light-fast red and permanent yellow.

8. The method for preparing the brightly colored and smoothly printed soybean ink according to claim 1, characterized in that: The following steps are involved: S1. First, stir and heat the formulated amount of epoxy soybean oil to 170-180° C., add the formulated amount of polyester modified acrylic resin, linear phenolic resin, and acrylic acid modified alkyd resin in batches, stir and mix evenly, and continue stirring at a constant temperature for 20-30 minutes to obtain a mixture A; S2, the mixture A obtained in step S1 is cooled to 110-120° C., a formulated amount of polyethylene wax is added, then cooled to 60-70° C., isoamyl acetate, butanol and ionic liquid are added, stirred for 10-15 min, then cooled to 35-40° C., a formulated amount of filler is added, stirred at a constant temperature for 20-30 min, then a formulated amount of pigment is added, stirred at a constant temperature for 40-50 min, to obtain a mixture B; S3. Grind the mixture B obtained in step S2 with a grinding device until the fineness reaches less than 13 μm, then heat the mixture to 35-40° C., add the formulated amount of surfactant, slow-drying agent, desiccant and gelling agent, continue stirring for 30-40 minutes, and cool to room temperature to obtain a soybean ink product.

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