Sunproof ink for paper product printing and preparation method thereof

Abstract

The invention provides sun-proof ink for paper product printing. The ink is prepared from the following raw materials in parts by weight: 30-35 parts of pigment, 28-33 parts of epoxidized soybean oil, 17-23 parts of rosin modified phenolic resin, 10-15 parts of terpene phenolic resin, 6-8 parts of acrylic acid modified alkyd resin, 2-3 parts of a UV absorbent, 0.2-0.5 part of an antioxidant, 18-20 parts of filler, 10-15 parts of a solvent, 1-2 parts of a surfactant, 0.5-1 part of a drying agent and 0.5-1 part of gel. The filler is a blend of nano aluminum oxide powder and organic nano montmorillonite powder in a weight ratio of 1: 1; the solvent is a blend of isoamyl acetate and pentaerythritol in a weight ratio of 1: 1; the UV absorbent is a blend of phenyl salicylate and 2-hydroxy-4-n-octyloxybenzophenone in a weight ratio of 1: 2; the antioxidant is bis (2, 4-di-tert-butylphenyl) pentaerythritol diphosphite ester. The ink disclosed by the invention has a very good sun-proof effect and also has a good printing effect.

Description

Technical Field

[0001] The invention relates to environmentally friendly printing ink and a preparation method thereof, in particular to a light-fast ink for paper printing and a preparation method thereof. Background Art

[0002] With the rapid development of offset printing in the field of packaging technology, various paper-based ink-printed packaging boxes have emerged. The market has increasingly higher requirements for inks used in printing packaging boxes. The light fastness of packaging box inks is an important indicator of printing inks. Since the light fastness of offset printing inks on the market is poor, the packaging boxes will age and fade under long periods of sunlight. Currently, there is an urgent need for a printing ink with a higher light fastness to meet market requirements. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a light-fast ink for paper printing, which has the characteristics of good printing effect and better light-fastness. The present invention also provides a method for preparing the light-fast ink.

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

[0005] The light-fast ink for paper printing is prepared from the following raw materials in parts by weight: 30-35 parts of pigment, 28-33 parts of epoxy soybean oil, 17-23 parts of rosin-modified phenolic resin, 10-15 parts of terpene phenolic resin, 6-8 parts of acrylic acid-modified alkyd resin, 2-3 parts of UV absorber, 0.2-0.5 parts of antioxidant, 18-20 parts of filler, 10-15 parts of solvent, 1-2 parts of surfactant, 0.5-1 parts of desiccant and 0.5-1 parts of gelling agent; the filler is a blend of nano-alumina powder and organic nano-montmorillonite powder in a weight ratio of 1:1; the solvent is a blend of isoamyl acetate and pentaerythritol in a weight ratio of 1:1; the UV absorber is a blend of phenyl o-hydroxybenzoate and 2-hydroxy-4-n-octyloxybenzophenone in a weight ratio of 1:2; and the antioxidant is bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite.

[0006] Furthermore, the surfactant is a blend of polysorbate and glyceryl monostearate in a weight ratio of 1:2.

[0007] Furthermore, the desiccant is copper octoate.

[0008] Furthermore, the gelling agent is aluminum distearate.

[0009] Furthermore, the pigment includes black pigment and color pigment; the black pigment is carbon black, and the color pigment is phthalocyanine blue, light-fast red, light-fast green and permanent yellow.

[0010] The method for preparing a light-fast ink for paper printing provided by the present invention comprises the following steps:

[0011] S1. First, stir and heat the formulated amount of epoxy soybean oil to 185-190° C., add the formulated amount of rosin-modified phenolic resin, terpene phenolic resin, and acrylic acid-modified alkyd resin in batches, stir and mix evenly, and continue stirring at a constant temperature for 30-40 minutes to obtain a mixture A;

[0012] S2, the mixture A obtained in step S1 is cooled to 55-60° C., isoamyl acetate and pentaerythritol are added in a formula amount, stirred for 10-15 min, and then bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite is added in a formula amount, and stirred at a constant temperature for 10-15 min; then the mixture is cooled to 35-40° C., nano-alumina powder and organic nano-montmorillonite powder are added in a formula amount, stirred at a constant temperature for 20-30 min, and then a pigment is added in a formula amount, and stirred at a constant temperature for 40-50 min to obtain a mixture B;

[0013] 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, desiccant and gelling agent, continue stirring for 15-20 minutes, cool to room temperature, add the formulated amount of phenyl o-hydroxybenzoate and 2-hydroxy-4-n-octyloxybenzophenone, continue stirring for 30-40 minutes, and obtain a light-fast ink product.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The resin of the invention is a compound of rosin-modified phenolic resin, terpene phenolic resin and acrylic acid-modified alkyd resin, so that the whole ink presents good viscosity and fluidity.

[0016] In addition, the present invention adds UV absorbers: phenyl o-hydroxybenzoate and 2-hydroxy-4-n-octyloxybenzophenone, which can absorb ultraviolet rays in a superimposed manner, making the absorption wavelength of ultraviolet rays wider and the absorption efficiency higher; adding an antioxidant improves the anti-ultraviolet light oxidation ability of the ink, and plays a good protective role on the color of the printing ink.

[0017] The filler of the present invention is a blend of nano-alumina and organic nano-montmorillonite. On the one hand, the filler in the ink can not only adjust the viscosity, fluidity, yield value and concentration of the ink; on the other hand, the nano-compound of nano-alumina and organic nano-montmorillonite can absorb ultraviolet rays with a longer wavelength range, and compounded with a UV absorber to increase the overall absorption rate of the ink for ultraviolet rays, making the ink more sun-resistant and less prone to aging and discoloration.

[0018] The various components of the light-fast ink formula of the present invention complement each other and form an indivisible whole. The addition of other additives also adjusts the indicators of the ink, making the overall fluidity and adhesion of the ink better, and presenting good printing effects, and the characteristics of light resistance and aging resistance. DETAILED DESCRIPTION

[0019] In order to better understand the technical content of the present invention, specific embodiments are provided below to further illustrate the present invention.

[0020] The embodiments of the present invention are based on the weight range of the light-fast ink components for paper printing, and several groups of data are selected for experiment:

[0021] The light-fast ink for paper printing is prepared from the following raw materials in parts by weight: 30-35 parts of pigment, 28-33 parts of epoxy soybean oil, 17-23 parts of rosin-modified phenolic resin, 10-15 parts of terpene phenolic resin, 6-8 parts of acrylic acid-modified alkyd resin, 2-3 parts of UV absorber, 0.2-0.5 parts of antioxidant, 18-20 parts of filler, 10-15 parts of solvent, 1-2 parts of surfactant, 0.5-1 parts of desiccant and 0.5-1 parts of gelling agent; the filler is a blend of nano-alumina powder and organic nano-montmorillonite powder in a weight ratio of 1:1; the solvent is a blend of isoamyl acetate and pentaerythritol in a weight ratio of 1:1; the UV absorber is a blend of phenyl o-hydroxybenzoate and 2-hydroxy-4-n-octyloxybenzophenone in a weight ratio of 1:2; and the antioxidant is bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite.

[0022] The method for preparing a light-fast ink for paper printing provided by the present invention comprises the following steps:

[0023] S1. First, stir and heat the formulated amount of epoxy soybean oil to 185-190° C., add the formulated amount of rosin-modified phenolic resin, terpene phenolic resin, and acrylic acid-modified alkyd resin in batches, stir and mix evenly, and continue stirring at a constant temperature for 30-40 minutes to obtain a mixture A;

[0024] S2, the mixture A obtained in step S1 is cooled to 55-60° C., isoamyl acetate and pentaerythritol are added in a formula amount, stirred for 10-15 min, and then bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite is added in a formula amount, and stirred at a constant temperature for 10-15 min; then the mixture is cooled to 35-40° C., nano-alumina powder and organic nano-montmorillonite powder are added in a formula amount, stirred at a constant temperature for 20-30 min, and then a pigment is added in a formula amount, and stirred at a constant temperature for 40-50 min to obtain a mixture B;

[0025] 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, desiccant and gelling agent, continue stirring for 15-20 minutes, cool to room temperature, add the formulated amount of phenyl o-hydroxybenzoate and 2-hydroxy-4-n-octyloxybenzophenone, continue stirring for 30-40 minutes, and obtain a light-fast ink product.

[0026] In order to reduce variables, the following examples and comparative examples all use weight parts: 32 parts of pigment, 30 parts of epoxidized soybean oil, 13 parts of solvent, 1.5 parts of surfactant, 0.5 parts of desiccant, 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-mentioned light-fast ink.

[0027] Table 1: Examples and Comparative Examples. Other components by weight.

[0028]

[0029] The inks prepared in Examples 1-2 and Comparative Examples 1-4 were printed as finished products and placed under a 120V 2*15W60HZD ultraviolet lamp, with the distance between the lamp tube and the color block being 5 cm, and irradiated continuously for 48 hours. The color changes of the samples in Example 1 and Example 2 were slight, with no significant changes. The samples in Comparative Examples 1, 2, and 3 aged and faded after irradiation for 42 hours, 35 hours, and 39.5 hours, respectively, which was more obvious compared with the samples before irradiation; the ink prepared in Comparative Example 4 had poor fluidity and excessive viscosity, making it difficult to spread the ink printing, and it was thick after printing, resulting in waste of ink and reduced color aesthetics. The above results show that the ink of the present invention has a good sun-fastness effect and a good printing effect.

[0030] 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. A light-fast ink for paper printing, characterized in that: The invention is prepared from the following raw materials in parts by weight: 30-35 parts of pigment, 28-33 parts of epoxy soybean oil, 17-23 parts of rosin-modified phenolic resin, 10-15 parts of terpene phenolic resin, 6-8 parts of acrylic acid-modified alkyd resin, 2-3 parts of UV absorber, 0.2-0.5 parts of antioxidant, 18-20 parts of filler, 10-15 parts of solvent, 1-2 parts of surfactant, 0.5-1 parts of desiccant and 0.5-1 parts of gelling agent; the filler is a blend of nano-alumina powder and organic nano-montmorillonite powder in a weight ratio of 1:1; the solvent is a blend of isoamyl acetate and pentaerythritol in a weight ratio of 1:1; the UV absorber is a blend of phenyl o-hydroxybenzoate and 2-hydroxy-4-n-octyloxybenzophenone in a weight ratio of 1:2; and the antioxidant is bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite.

2. The light-fast ink for paper printing according to claim 1, characterized in that: The surfactant is a blend of polysorbate and glyceryl monostearate in a weight ratio of 1:

2.

3. The light-fast ink for paper printing according to claim 2, characterized in that: The desiccant is copper octoate.

4. The light-fast ink for paper printing according to claim 3, characterized in that: The gelling agent is aluminum distearate.

5. The light-fast ink for paper printing according to claim 4, characterized in that: The pigments include black pigments and color pigments; the black pigment is carbon black, and the color pigments are phthalocyanine blue, light-fast red, light-fast green and permanent yellow.

6. The method for preparing a light-fast ink for paper printing 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 185-190° C., add the formulated amount of rosin-modified phenolic resin, terpene phenolic resin, and acrylic acid-modified alkyd resin in batches, stir and mix evenly, and continue stirring at a constant temperature for 30-40 minutes to obtain a mixture A; S2, the mixture A obtained in step S1 is cooled to 55-60° C., isoamyl acetate and pentaerythritol are added in a formula amount, stirred for 10-15 min, and then bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite is added in a formula amount, and stirred at a constant temperature for 10-15 min; then the mixture is cooled to 35-40° C., nano-alumina powder and organic nano-montmorillonite powder are added in a formula amount, stirred at a constant temperature for 20-30 min, and then a pigment is added in a formula amount, and 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, desiccant and gelling agent, continue stirring for 15-20 minutes, cool to room temperature, add the formulated amount of phenyl o-hydroxybenzoate and 2-hydroxy-4-n-octyloxybenzophenone, continue stirring for 30-40 minutes, and obtain a light-fast ink product.

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