A kind of water-based gravure web ink and preparation method thereof

Abstract

The invention discloses a water-based gravure web ink and a preparation method thereof, and belongs to the technical field of water-based ink. The raw materials for preparing the water-based gravure web ink of the invention include: epoxy-modified polyurethane, water-based polyamide ink resin, asphalt composite emulsion, pigment, filler, deionized water, ethanol, triethylamine, and additives; in view of the characteristics that web offset printing presses and printing presses have high production efficiency and require high drying rate of the ink used, the invention uses anionic water-based polyamide ink resin as a connecting material, supplemented with special epoxy-modified polyurethane and asphalt composite emulsion to prepare a water-based ink with fast drying rate. The invention expands the application field of water-based ink, is environmentally friendly and pollution-free, and has good market competitiveness.

Description

Technical Field

[0001] The invention belongs to the technical field of water-based inks, and in particular relates to a water-based gravure web ink and a preparation method thereof. Background Art

[0002] Ink is a uniform mixture of colorants (pigments, dyes, etc.), binders, fillers, additives and other substances; it is mainly used for printing and dries on the substrate. It is a colored and fluid slurry adhesive. Water-based ink is also called water-based ink, which is mainly made of water-soluble resins, water-soluble pigments, water and additives. Unlike traditional inks, water-based ink is made through scientific processing with water as the solvent. Since it does not contain volatile toxic organic solvents, it has no adverse effects on the health of related operators during the printing process, and it does not pollute the atmospheric environment or the printed matter itself, so its application field is becoming more and more extensive.

[0003] Web ink is a kind of penetrating drying ink, which is mainly used in offset printing presses and printing presses. One of the characteristics of web offset printing presses and printing presses is that the production efficiency is particularly high. For example, the rotation speed of web offset printing presses is generally 35,000-40,000 revolutions per hour. Under this working condition, web ink must meet a relatively high drying speed. However, water-based ink itself has the defect of slow drying speed. Unless the printing press is equipped with sufficient drying equipment, it will inevitably affect the printing speed. In addition, the glossiness of products printed with water-based ink is also not as good as that of solvent-based ink, which also limits the application of water-based ink in some special fields. Based on this, it is quite challenging to replace traditional solvent-based ink with water-based ink in web offset printing presses, and more in-depth research and improvement on the formulation and processing technology of water-based ink are still needed. Summary of the invention

[0004] In view of the problems raised in the background technology, the purpose of the present invention is to provide a water-based gravure web ink and a preparation method thereof. The drying speed of the water-based ink prepared by the present invention is significantly improved, and it can meet the performance requirements of inks used in web offset printing presses and printing presses.

[0005] The present invention is specifically achieved through the following technical solutions:

[0006] The present invention provides a water-based gravure web ink, which comprises the following raw materials by weight:

[0007] Epoxy modified polyurethane 20-30 parts,

[0008] 35-60 parts of water-based polyamide ink resin,

[0009] Asphalt composite emulsion 22-28 parts,

[0010] Pigment 10-18 parts,

[0011] 8-20 parts of filler,

[0012] 15-35 parts of deionized water,

[0013] 5-10 parts of ethanol,

[0014] 4-8 parts of triethylamine,

[0015] 3-12 parts of additives.

[0016] Preferably, the water-based gravure web ink is prepared from the following raw materials in parts by weight:

[0017] Epoxy modified polyurethane 24 parts,

[0018] 50 parts of water-based polyamide ink resin,

[0019] Asphalt composite emulsion 26 parts,

[0020] 15 parts of pigment,

[0021] 12 parts of filler,

[0022] 25 parts of deionized water,

[0023] 8 parts of ethanol,

[0024] 6 parts of triethylamine,

[0025] 8 parts of additives.

[0026] Preferably, the preparation method of the epoxy-modified polyurethane is: reacting epoxy resin with diisocyanate, polyether diol, stannous octoate, dibutyltin dilaurate and dimethylolpropionic acid at elevated temperature, followed by chain extension and neutralization to obtain the epoxy-modified polyurethane.

[0027] Preferably, the water-based polyamide ink resin is anionic, has a solid content of 38%-42%, and a viscosity of no more than 500 cps at 25°C.

[0028] Preferably, the preparation method of the asphalt composite emulsion is: alkyl sodium sulfate and water are mixed and heated to 90°C, coal tar asphalt is heated to 170°C, the two are mixed and emulsified to obtain a mixed emulsion, and then carboxylated styrene butadiene latex with 1 / 4 mass of the mixed emulsion is added to obtain the asphalt composite emulsion.

[0029] Preferably, the pigment is at least one of an organic pigment, an inorganic pigment and a dye.

[0030] Preferably, the filler is at least one of kaolin, calcium carbonate, silicon dioxide and titanium dioxide.

[0031] Preferably, the auxiliary agents include defoaming agents, film-forming agents and brighteners.

[0032] Based on the characteristics of high production efficiency of web offset printing presses and printing presses and high requirements for the drying rate of the ink used, the present invention uses anionic water-based polyamide ink resin as a connecting material, supplemented by special epoxy-modified polyurethane and asphalt composite emulsion, which not only enhances the printing effect of water-based polyamide ink resin, improves the gradation and color quality of the printed image of the printed product, but also can greatly accelerate the drying speed of the obtained water-based ink, effectively solving the problems of stickiness and poor water resistance on the back of the printed product.

[0033] The present invention also provides a method for preparing the above-mentioned water-based gravure web ink, comprising the following steps:

[0034] Weigh each raw material according to the formula and set aside for use. Take the water-based polyamide ink resin and the epoxy-modified polyurethane and asphalt composite emulsion and fully blend them to obtain a mixture. Then add the remaining pigment, filler, deionized water, ethanol, triethylamine and additives to the obtained mixture for high-speed dispersion to obtain a water-based gravure web ink.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The present invention uses anionic water-based polyamide ink resin as a connecting material, supplemented by special epoxy-modified polyurethane and asphalt composite emulsion to prepare a water-based ink, which overcomes many limitations caused by the slow drying rate of traditional water-based inks, meets the performance requirements of inks for web offset printing machines and printing machines, expands the application field of water-based inks, and is environmentally friendly and pollution-free. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the embodiments. If the specific conditions are not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments is not specified, they are all conventional products that can be purchased commercially.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0039] Example 1

[0040] A water-based gravure web ink, comprising:

[0041] 1. Add epoxy resin E51 (epoxy value 0.52), isophorone diisocyanate, polyether diol N210, stannous octoate, and dibutyltin dilaurate in equal mass ratios into a container, mix well, heat to 90°C and react for 100 minutes, then add an appropriate amount of dimethylolpropionic acid and continue to react for 50 minutes, finally add diethylene glycol and acetone, react at 60°C for 120 minutes, extend the chain, cool down, add triethylamine to neutralize, add water at high speed to shear, and remove acetone to obtain epoxy-modified polyurethane (solid content 42%).

[0042] 2. Take 1 part by weight of sodium alkyl sulfate (C 14 ) is mixed with 14 parts by weight of water and heated to 90°C, and another 20 parts by weight of coal tar pitch is heated to 170°C. The two are mixed and emulsified to obtain a mixed emulsion, and then 1 / 4 weight of carboxylated styrene butadiene latex (solid content 50%) of the mixed emulsion is added to mix to obtain an asphalt composite emulsion.

[0043] 3. Take 24 parts of the above-mentioned epoxy modified polyurethane, 50 parts of the water-based polyamide ink resin (anionic, solid content 40%), 26 parts of the above-mentioned asphalt composite emulsion, 15 parts of pigment, 12 parts of filler, 25 parts of deionized water, 8 parts of ethanol, 6 parts of triethylamine, and 8 parts of additives (silicone oil, ethylene glycol phenyl ether, erucamide, etc. in weight ratio); take the water-based polyamide ink resin and the epoxy modified polyurethane and asphalt composite emulsion and fully blend them to obtain a mixture, then add the remaining pigment, filler, deionized water, ethanol, triethylamine and additives to the obtained mixture for high-speed dispersion to obtain a water-based gravure web ink.

[0044] Example 2

[0045] A water-based gravure web ink, comprising:

[0046] 1. Add epoxy resin E51, isophorone diisocyanate, polyether diol N210, stannous octoate and dibutyltin dilaurate in equal mass ratio into a container, mix well and heat to 90°C for reaction for 100 min, then add appropriate amount of dimethylolpropionic acid and continue to react for 50 min, finally add diethylene glycol and acetone, react at 60°C for 120 min, then cool down after chain extension, add triethylamine for neutralization, add water for high-speed shearing and remove acetone to obtain epoxy-modified polyurethane (solid content 42%).

[0047] 2. Take 1 part by weight of sodium alkyl sulfate and 14 parts by weight of water, mix them and heat them to 90°C. Take another 20 parts by weight of coal tar asphalt and heat them to 170°C. Mix and emulsify the two to obtain a mixed emulsion. Then add 1 / 4 weight of carboxylated styrene butadiene latex (solid content 50%) to the mixed emulsion to obtain an asphalt composite emulsion.

[0048] 3. Take 20 parts of the above-mentioned epoxy modified polyurethane, 60 parts of the water-based polyamide ink resin, 22 parts of the above-mentioned asphalt composite emulsion, 15 parts of pigment, 12 parts of filler, 30 parts of deionized water, 10 parts of ethanol, 4 parts of triethylamine, and 3 parts of additives by weight; take the water-based polyamide ink resin and the epoxy modified polyurethane and asphalt composite emulsion and fully blend them to obtain a mixture, and then add the remaining pigment, filler, deionized water, ethanol, triethylamine and additives to the obtained mixture for high-speed dispersion to obtain a water-based gravure web ink.

[0049] Example 3

[0050] A water-based gravure web ink, comprising:

[0051] 1. Add epoxy resin E51, isophorone diisocyanate, polyether diol N210, stannous octoate and dibutyltin dilaurate in equal mass ratio into a container, mix well and heat to 90°C for reaction for 100 min, then add appropriate amount of dimethylolpropionic acid and continue to react for 50 min, finally add diethylene glycol and acetone, react at 60°C for 120 min, then cool down after chain extension, add triethylamine for neutralization, add water for high-speed shearing and remove acetone to obtain epoxy-modified polyurethane (solid content 42%).

[0052] 2. Take 1 part by weight of sodium alkyl sulfate and 14 parts by weight of water, mix them and heat them to 90°C. Take another 20 parts by weight of coal tar asphalt and heat them to 170°C. Mix and emulsify the two to obtain a mixed emulsion. Then add 1 / 4 weight of carboxylated styrene butadiene latex (solid content 50%) to the mixed emulsion to obtain an asphalt composite emulsion.

[0053] 3. Take 30 parts of the above-mentioned epoxy-modified polyurethane, 35 parts of the water-based polyamide ink resin, 28 parts of the above-mentioned asphalt composite emulsion, 15 parts of pigment, 12 parts of filler, 35 parts of deionized water, 5 parts of ethanol, 8 parts of triethylamine, and 12 parts of additives by weight; fully blend the water-based polyamide ink resin with the epoxy-modified polyurethane and the asphalt composite emulsion to obtain a mixture, and then add the remaining pigment, filler, deionized water, ethanol, triethylamine and additives to the obtained mixture for high-speed dispersion to obtain a water-based gravure web ink.

[0054] Comparative Example 1

[0055] This comparative example refers to the step parameters of Example 1, except that the water-based polyamide ink resin is replaced by a water-soluble acrylic resin, that is, the raw materials are 24 parts of epoxy-modified polyurethane, 50 parts of water-soluble acrylic resin, 26 parts of asphalt composite emulsion, 15 parts of pigment, 12 parts of filler, 25 parts of deionized water, 8 parts of ethanol, 6 parts of triethylamine, and 8 parts of additives.

[0056] Comparative Example 2

[0057] This comparative example refers to the step parameters of Example 1, except that no asphalt composite emulsion is added, that is, the raw materials are 33 parts of epoxy modified polyurethane, 67 parts of water-based polyamide ink resin, 15 parts of pigment, 12 parts of filler, 25 parts of deionized water, 8 parts of ethanol, 6 parts of triethylamine, and 8 parts of additives.

[0058] The performance of the water-based gravure web ink samples prepared in Examples 1-3 and Comparative Examples 1 and 2 was tested in accordance with GB / T 13217.2-2009. The results are shown in the table below.

[0059] Table 1

[0060]

[0061] The embodiments described above only express several preferred embodiments of the present invention, and the descriptions thereof are relatively specific and detailed, but are not intended to limit the present invention. It should be noted that for those skilled in the art, the present invention may also have various changes and modifications, and any modifications, equivalent substitutions, improvements, etc. made within the concept and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water-based gravure web ink, characterized in that: The raw materials prepared by weight are: Epoxy modified polyurethane 20-30 parts, 35-60 parts of water-based polyamide ink resin, Asphalt composite emulsion 22-28 parts, Pigment 10-18 parts, 8-20 parts of filler, 15-35 parts of deionized water, 5-10 parts of ethanol, 4-8 parts of triethylamine, 3-12 parts of additives; Among them, the preparation method of epoxy modified polyurethane is: heat the epoxy resin with diisocyanate, polyether diol, stannous octoate, dibutyltin dilaurate, and dihydroxymethylpropionic acid, and then extend the chain and neutralize to obtain epoxy modified polyurethane; the water-based polyamide ink resin is anionic, with a solid content of 38%-42% and a viscosity of no more than 500 cps at 25°C; the preparation method of asphalt composite emulsion is: mix alkyl sodium sulfate and water and heat to 90°C, and heat coal tar asphalt to 170°C, mix and emulsify the two to obtain a mixed emulsion, and then add 1 / 4 of the mass of carboxylated styrene butadiene latex to the mixed emulsion to obtain the asphalt composite emulsion.

2. The water-based gravure web ink according to claim 1, characterized in that: The water-based gravure web ink is prepared from the following raw materials by weight: Epoxy modified polyurethane 24 parts, 50 parts of water-based polyamide ink resin, Asphalt composite emulsion 26 parts, 15 parts of pigment, 12 parts of filler, 25 parts of deionized water, 8 parts of ethanol, 6 parts of triethylamine, 8 parts of additives.

3. The water-based gravure web ink according to claim 1, characterized in that: The pigment is at least one of an organic pigment, an inorganic pigment and a dye.

4. The water-based gravure web ink according to claim 1, characterized in that: The filler is at least one of kaolin, calcium carbonate, silicon dioxide and titanium dioxide.

5. The water-based gravure web ink according to claim 1, characterized in that: The auxiliary agents include defoaming agents, film-forming agents and brighteners.

6. The method for preparing the water-based gravure web ink according to any one of claims 1 to 5, characterized in that: The steps include: Weigh each raw material according to the formula and set aside for use. Take the water-based polyamide ink resin and the epoxy-modified polyurethane and asphalt composite emulsion and fully blend them to obtain a mixture. Then add the remaining pigment, filler, deionized water, ethanol, triethylamine and additives to the obtained mixture for high-speed dispersion to obtain a water-based gravure web ink.

7. Use of the water-based gravure web ink as claimed in any one of claims 1 to 5 in gravure multi-color printing of various plastic films and paper web materials.

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