Environment-friendly anti-static water-based ink, printing process and application

Abstract

The invention provides environment-friendly anti-static water-based ink, a printing technology and application. The water-based ink is prepared from 25-30 parts of pigment, 30-35 parts of water-based self-crosslinking acrylic resin, 2-7 parts of auxiliaries, 1-3 parts of organic silicon modified water-based polyurethane resin, 25-30 parts of water and 5-10 parts of conductive polymer solution. According to the anti-static water-based ink, the water-based self-crosslinking acrylic resin and the conductive polymer solution are used, so that the anti-static effect of the water-based ink is improved; the water-based ink is combined with a printing process, static electricity is prevented from being generated in the printing process, the product quality is improved, and the water-based ink does not contain volatile organic solvents, does not have adverse effects on health of workers in the printing process and has the advantage of being environmentally friendly.

Description

Technical Field

[0001] The invention relates to the technical field of ink design and use, and in particular to an environmentally friendly antistatic water-based ink, a printing process and an application thereof. Background Art

[0002] Materials used in the printing industry, such as paper, ink, plate rollers, etc., are good insulating materials, which are easy to carry static electricity and are not easy to eliminate. Static charge has many hazards. The first hazard is electrostatic discharge. The most serious electrostatic discharge will produce sparks, which may cause explosions and fires in places where flammable and explosive materials exist, causing huge casualties and economic losses; secondly, the current of rapid electrostatic discharge will damage modern electronic products (especially the breakdown hazard of integrated circuit components), thus causing expensive equipment to be destroyed; the second hazard is electrostatic adsorption. Static electricity can have a strong adsorption effect on fine dust particles, resulting in more dust on the product and causing losses to production; the third hazard is that the presence of static charge will increase the reaction suitability of the substance; the fourth hazard is the hazard to human health. Medical experts have confirmed that skin electrostatic interference can change the normal potential difference of the human body surface and affect the normal electrophysiological process of the myocardium. This static electricity can aggravate the patient's condition. Persistent static electricity will also increase the alkalinity of the blood, leading to skin itching, pigmentation, affecting the physiological balance of the human body, and interfering with people's emotions.

[0003] At present, the anti-static technology at home and abroad mainly includes the following methods: First, improve the conductivity of the material, such as adding a high content of conductive filler to the ink, but there are many difficulties in synthesis and processing, the cost is high, and it will affect some index performance, which makes the application of this method very limited; second, increase the air humidity to keep the relative air humidity above 60%, because higher air humidity helps to form a water molecule film on the surface of the material, which is conducive to static dissipation, but in northern my country, the relative air humidity is between 20% and 30% all year round, and most equipment (especially electronic equipment) cannot work or work for a long time at a relative humidity greater than 60%. Therefore, increasing the air humidity to solve the problem of static accumulation cannot be actually applied in most industries; third, apply a layer of antistatic agent on the surface of the substrate, which has an adverse effect on the quality of paper; fourth, install static elimination equipment on the front and back of each gravure printing unit and winding, but this method requires a large investment and the effect is not obvious.

[0004] In terms of ink technology, the conductive fillers commonly used in antistatic inks include surfactants, metal fillers, carbon fillers, metal oxide fillers, composite conductive fillers and conductive polymers; among them, surfactants are limited in application due to problems such as high resistance, poor adhesion, short timeliness and dependence on air humidity; metal fillers with higher resistance are mainly nickel, copper, aluminum and silver powders, but their use is gradually reduced due to their high density, easy sedimentation and easy oxidation failure; metal oxide fillers and composite conductive fillers are gradually fading out due to factors such as difficulty in dispersion and excessive heavy metals; carbon fillers are mainly carbon black and graphite, which are relatively cheap in cost despite their single color; conductive polymers are mainly polythiophene, polypyrrole, polyaniline and their derivatives, representing a new generation of conductive materials. Although the cost is relatively high, their resistance can be adjusted over a wide range, they have excellent antistatic properties, and can be developed into high-end and high-quality water-based antistatic coating inks.

[0005] Artificial board facing printing paper (facing paper) is a decorative base paper printed with inks of different colors, impregnated with modified melamine resin glue after printing, and then used for artificial board veneer. During the printing production process, static electricity will affect the quality of printed products, increase printed product losses and affect production efficiency; not only that, the good light resistance grade and thermal stability of the decorative paper are important indicators of facing paper products; with the improvement of people's quality of life, ecological and environmentally friendly products have become people's first choice, and the current ordinary inks contain organic solvents, which will produce VOC emissions during the production process, which is not conducive to environmental protection. Therefore, it is of great significance to provide an environmentally friendly water-based ink to replace ordinary inks; in addition, domestic anti-static water-based inks are currently mostly used in packaging materials, electronic components, etc., and there is no similar anti-static technology application in artificial facing paper printing. Anti-static water-based inks at home and abroad; therefore, providing a water-based ink that can be used in artificial facing paper to improve anti-static performance, improve workplace, use safety, and light resistance is of great significance to the industry. Summary of the invention

[0006] In view of this, the present invention provides an environmentally friendly antistatic water-based ink, a printing process and an application thereof. In the antistatic water-based ink, a water-based self-crosslinking acrylic resin and a conductive polymer solution are used to improve the antistatic effect of the water-based ink. By combining with the printing process, static electricity is avoided during the printing process, and product quality is improved. Moreover, the water-based ink does not contain volatile organic solvents, and has no adverse effects on the health of workers during the printing process, thus having the advantage of being environmentally friendly.

[0007] The technical solution of the present invention is as follows: An environmentally friendly antistatic water-based ink comprises the following components in parts by weight: 25-30 parts of colorant, 30-35 parts of water-based self-crosslinking acrylic resin, 2-7 parts of auxiliary agent, 1-3 parts of silicone-modified water-based polyurethane resin, 25-30 parts of water, and 5-10 parts of conductive polymer solution; the water-based ink can form a water film during printing and has a good antistatic effect.

[0008] In the environmentally friendly antistatic water-based ink, the water-based ink prepared by using water-based self-cross-linking acrylic resin, colorant, additives, silicone-modified water-based polyurethane resin and other raw materials replaces ordinary ink; and conductive polymer solution is added during production, and the environmentally friendly antistatic water-based ink is made through stirring and grinding.

[0009] Preferably, the auxiliary agent includes a thickener, a wetting agent, a cross-linking agent and a defoaming agent; the weight ratio of the thickener, the wetting agent, the cross-linking agent and the defoaming agent is 1:2:1:1.

[0010] Preferably, the thickener is hydroxyethyl cellulose, the wetting agent is octyl phosphate, the crosslinking agent is trimethylolpropane triacrylate, and the defoaming agent is glyceryl stearate.

[0011] Preferably, the conductive polymer solution is a poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) aqueous solution.

[0012] Preferably, the above-mentioned environmentally friendly antistatic water-based ink has a viscosity of (8-15) S / coating 3# cup, a fineness of ≤10 μm, a pH of 8.2-9.2, and a tinting strength of 95-105%.

[0013] The preparation process of the above-mentioned environmentally friendly antistatic water-based ink is as follows: first, deionized water, colorant, water-based self-cross-linking acrylic resin, silicone-modified water-based polyurethane resin, and additives are added in sequence according to the formula ratio, and stirred on a high-speed mixer for 30-40 minutes. Then, a grinding and dispersing device is used, and zirconium beads are added and ground for 2-3 hours to obtain a base ink. Then, the base ink and the conductive polymer solution are mixed together according to the ratio, and stirred on a magnetic stirrer for 1-2 hours to finally obtain an environmentally friendly antistatic water-based ink.

[0014] The printing process of the above-mentioned environmentally friendly antistatic water-based ink is as follows: the printing roller pressure is controlled to be 3.5-4kg, the scraper angle is 45°, the scraper pressure is 1.5-2g, and the printing speed is 200-250m / min; Through research, it is found that sufficiently large printing pressure can make the ink of printed products firm, but it will generate a lot of static electricity, otherwise it will affect the quality of printed products; the faster the printing speed, the faster the friction speed between paper and printing plate and ink, as well as the contact and peeling speed between paper and roller are, the more the movement intensifies, leading to an increase in static electricity, otherwise the production efficiency decreases; therefore, in the present invention, by controlling the pressure of the printing rubber roller, the angle of the scraper, the pressure of the scraper and the printing speed, further anti-static performance is achieved, effectively improving product quality and reducing the defective rate.

[0015] Applying the above-mentioned environmentally friendly anti-static water-based ink to the printing substrate can reduce the generation of static electricity.

[0016] Preferably, the printing substrate includes but is not limited to artificial boards, decorative boards, and paper.

[0017] When the above-mentioned environmentally friendly antistatic water-based ink is used in decorative panels, it can enhance the adhesion of the ink layer and paper of the decorative panels to the substrate, and the printed patterns can achieve better covering effects and high hue saturation.

[0018] When the above-mentioned environmentally friendly anti-static water-based ink is used in decorative panels, the specific process is as follows: Use the artificial board facing paper printed with environmentally friendly anti-static water-based ink, then impregnate it with melamine glue, and then use the press machine to heat press it on plywood, density board or particle board to make anti-static environmentally friendly decorative board; In water-based inks, water-based self-cross-linking acrylic resins undergo a cross-linking reaction with melamine during the impregnation process, which enhances the adhesion of the ink layer of the decorative board and the paper to the substrate. The printed pattern can achieve a better covering effect and high hue saturation. Static electricity generation can be reduced by adjusting the pressure of the printing rubber roller, the scraper angle and pressure, and the printing speed technical parameters during the printing process.

[0019] Compared with the prior art, the beneficial effects of the present invention are: 1. In the present invention, water-based environmentally friendly ink prepared by cross-linking water-based acrylic acid, colorant, additive and conductive polymer solution is used to replace ordinary ink. The ink does not contain volatile organic solvents, and there is no VOC emission in the production process.

[0020] 2. In the present invention, a conductive polymer solution is added to the water-based ink to solve the problems of wire drawing, ink flying, low ink transfer rate and the like caused by static electricity during printing, thereby improving the printing quality and reducing the defective rate.

[0021] 3. In the present invention, by adjusting the pressure of the rubber roller, the angle and pressure of the scraper, and the technical parameters of the printing speed in the printing process, the generation of static electricity can be further prevented.

[0022] 4. In the present invention, the formulated water-based ink is combined with the printing process, which not only effectively prevents the generation of static electricity, but also effectively improves the longitudinal tensile strength, wet longitudinal tensile strength, light fastness and heat resistance of the product, thereby improving the quality of the product. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] In the present invention, the reagents used are all commercially available products; the thickener is hydroxyethyl cellulose, the wetting agent is octyl phosphate, the crosslinking agent is trimethylolpropane triacrylate, and the defoaming agent is glyceryl stearate; and the conductive polymer solution is a poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) aqueous solution.

[0025] Example 1 An environmentally friendly antistatic water-based ink comprises the following components by weight: 27kg of pigment, 32kg of water-based self-crosslinking acrylic resin, 6kg of additives, 2kg of silicone-modified water-based polyurethane resin, 28kg of water, and 7kg of conductive polymer solution; the water-based ink can form a water film during the printing process and has a good anti-static effect; The additives include a thickener, a wetting agent, a crosslinking agent and a defoaming agent; the weight ratio of the thickener, the wetting agent, the crosslinking agent and the defoaming agent is 1:2:1:1; The above-mentioned environmentally friendly antistatic water-based ink is prepared by: First, deionized water, colorant, water-based self-crosslinking acrylic resin, silicone-modified water-based polyurethane resin, and additives are added in order according to the formula ratio, and stirred in a high-speed mixer for 35 minutes; Then use a grinding and dispersing device, add zirconium beads, and grind for 2.5 hours to obtain the base ink; Then the base ink and the conductive polymer solution are mixed together according to a ratio, and stirred on a magnetic stirrer for 1.5 hours to finally obtain an environmentally friendly antistatic water-based ink; Environmentally friendly anti-static water-based ink, viscosity is 12S / coating 3# cup, fineness is 7μm, pH is 9.0, and tinting strength is 102%; The printing process of the above-mentioned environmentally friendly antistatic water-based ink is as follows: the printing roller pressure is controlled to be 3.7 kg, the scraper angle is 45°, the scraper pressure is 1.7 g, and the printing speed is 220 m / min; When the above-mentioned environmentally friendly anti-static water-based ink is used in decorative panels, the process is as follows: The anti-static and environmentally friendly decorative board is made by using artificial board facing paper printed with environmentally friendly anti-static water-based ink, which is then impregnated with melamine glue and hot-pressed onto the plywood by a press machine.

[0026] In water-based ink, water-based self-crosslinking acrylic resin undergoes a crosslinking reaction with melamine during the impregnation process, which enhances the adhesion of the ink layer and paper of the decorative board to the substrate. The printed pattern can achieve a better covering effect and high hue saturation. The generation of static electricity can be reduced by adjusting the technical parameters of the printing roller pressure, scraper angle and pressure, and printing speed during the printing process.

[0027] The key technical performance indicators of Example 1, German Hartmann and Jiangsu Jingcai ink are compared in Table 1 as follows: Table 1 Comparison of key technical performance indicators

[0028] The indexes of the facing paper after the application of Example 1, German Hartmann (high-end ink for facing paper), and Jiangsu Jingcai ink are statistically analyzed, as shown in Table 2, as follows: Table 2 Technical performance index statistics

[0029] It can be seen from Table 2 above that the environmentally friendly water-based ink obtained by the method of the present invention has good antistatic performance and a significantly improved light fastness grade compared with existing products.

[0030] Combined with the obtained facing paper, it can be seen that the printed pattern obtained using the water-based ink of Example 1 of the present invention has better covering effect, high hue saturation, and the product dots are fine and clear, with a strong sense of hierarchy, good texture, moist and full, and few white spots; during the printing process, the water-based ink of Example 1 has good adaptability and can maintain consistent color tone for a long time of printing; and the water-based ink is resistant to high temperature and hot pressing, and has excellent light-fastness; the colors are mixed without floating color or rejection; it has a good anti-static effect, avoids dust adsorption during the printing process, improves printing quality, and increases the yield.

[0031] Example 2 An environmentally friendly antistatic water-based ink comprises the following components by weight: 25kg of pigment, 30kg of water-based self-crosslinking acrylic resin, 2kg of additives, 1kg of silicone-modified water-based polyurethane resin, 25kg of water, and 5kg of conductive polymer solution; the water-based ink can form a water film during the printing process and has a good anti-static effect; The auxiliary agent includes a thickener, a wetting agent, a cross-linking agent and a defoaming agent; the weight ratio of the thickener, the wetting agent, the cross-linking agent and the defoaming agent is 1:2:1:1; The above-mentioned environmentally friendly antistatic water-based ink is prepared by: First, deionized water, colorant, water-based self-crosslinking acrylic resin, silicone-modified water-based polyurethane resin, and additives are added in order according to the formula ratio, and stirred in a high-speed mixer for 30 minutes; Then use a grinding and dispersing device, add zirconium beads, and grind for 2 hours to obtain the base ink; Then the base ink and the conductive polymer solution are mixed together according to a ratio, and stirred on a magnetic stirrer for 1 hour to finally obtain an environmentally friendly antistatic water-based ink; Environmentally friendly anti-static water-based ink, viscosity 8S / coating 3# cup, fineness 5μm, pH 8.5, tinting strength 95%; The printing process of the above-mentioned environmentally friendly antistatic water-based ink is as follows: the printing roller pressure is controlled to be 3.5kg, the scraper angle is 45°, the scraper pressure is 1.5g, and the printing speed is 200m / min; When the above-mentioned environmentally friendly anti-static water-based ink is used in decorative panels, the specific process is as follows: The wood-based panel facing paper printed with environmentally friendly anti-static water-based ink is used, and then impregnated with melamine glue, and then hot-pressed on the density board by a press machine to make anti-static and environmentally friendly decorative panels; In water-based ink, water-based self-crosslinking acrylic resin undergoes a crosslinking reaction with melamine during the impregnation process, which enhances the adhesion of the ink layer and paper of the decorative board to the substrate. The printed pattern can achieve a better covering effect and high hue saturation. The generation of static electricity can be reduced by adjusting the technical parameters of the printing roller pressure, scraper angle and pressure, and printing speed during the printing process.

[0032] Example 3 An environmentally friendly antistatic water-based ink comprises the following components by weight: 30kg of pigment, 35kg of water-based self-crosslinking acrylic resin, 7kg of additives, 3kg of silicone-modified water-based polyurethane resin, 30kg of water, and 10kg of conductive polymer solution; the water-based ink can form a water film during the printing process and has a good anti-static effect; The additives include a thickener, a wetting agent, a crosslinking agent and a defoaming agent; the weight ratio of the thickener, the wetting agent, the crosslinking agent and the defoaming agent is 1:2:1:1; The above-mentioned environmentally friendly antistatic water-based ink is prepared by: First, deionized water, colorant, water-based self-crosslinking acrylic resin, silicone-modified water-based polyurethane resin, and additives are added in order according to the formula ratio, and stirred in a high-speed mixer for 40 minutes; Then use a grinding and dispersing device, add zirconium beads, and grind for 3 hours to obtain the base ink; Then the base ink and the conductive polymer solution are mixed together according to a ratio, and stirred on a magnetic stirrer for 2 hours to finally obtain an environmentally friendly antistatic water-based ink; The above-mentioned environmentally friendly antistatic water-based ink has a viscosity of 15S / coating 3# cup, a fineness of 9μm, a pH of 9.2, and a tinting strength of 105%; The printing process of the above-mentioned environmentally friendly antistatic water-based ink is as follows: the printing roller pressure is controlled to be 4kg, the scraper angle is 45°, the scraper pressure is 2g, and the printing speed is 250m / min; When the above-mentioned environmentally friendly anti-static water-based ink is used in decorative panels, the specific process is as follows: The wood-based panel facing paper printed with environmentally friendly anti-static water-based ink is used, and then impregnated with melamine glue, and then hot-pressed on the particle board by a press machine to produce anti-static and environmentally friendly decorative panels; In water-based ink, water-based self-crosslinking acrylic resin undergoes a crosslinking reaction with melamine during the impregnation process, which enhances the adhesion of the ink layer and paper of the decorative board to the substrate. The printed pattern can achieve a better covering effect and high hue saturation. The generation of static electricity can be reduced by adjusting the technical parameters of the printing roller pressure, scraper angle and pressure, and printing speed during the printing process.

[0033] Dilong New Materials (Linyi) Co., Ltd.'s environmentally friendly anti-static water-based ink, printing process and application, through the development of new water-based anti-static ink and improved printing process for production, solves the impact of static electricity on product quality in the printing production process, avoids the adsorption of dust and paper scraps by paper during printing, improves production efficiency and yield rate, and minimizes the static impact on the downstream impregnation process. The anti-static water-based ink can also be applied to the anti-static requirements of other printed materials, electronic components, packaging containers, etc., with significant economic benefits.

[0034] Economic benefit calculation: (1) Manufacturing cost is based on actual conditions, see Table 3 below: Table 3 Cost ratio and analysis

[0035] (2) Sales price analysis: The sales price is 15,000 yuan / ton, the annual output is 800 tons, and the sales revenue can be 800*1.5=12 million yuan.

[0036] (3) Analysis of sales tax and surcharges: The annual value-added tax and surcharges are calculated in accordance with national regulations. The product value-added tax rate is 13%, the urban maintenance and construction tax rate is 5%, the education surcharge rate is 3%, the local education surcharge rate is 2%, and the total tax surcharge rate is 10%. The value-added tax burden rate is approximately 4%; sales tax and surcharges = 1200*4%*(1+10%) = 528,000 yuan.

[0037] (4) Analysis of three expenses: The three expenses refer to administrative expenses, sales expenses and financial expenses. According to the company's financial data in previous years and the financial data of this project, the rate of the three expenses is 15% (including R&D expenses), that is, 1200*15%=1.8 million yuan.

[0038] To sum up, the total profit analysis is: after the project reaches full production, the sales revenue excluding tax can be 12 million yuan, the production cost is 8.8 million yuan, the sales tax and surcharge is 528,000 yuan, and the three expenses are 1.8 million yuan, then the total profit is 872,000 yuan.

[0039] Net profit analysis: The applicable income tax rate for this enterprise is 25%, that is, the corporate income tax is 87.20*25%=218,000 yuan, and the net profit is 654,000 yuan.

[0040] Social benefits: The environmentally friendly water-based ink and printing process provided by the present invention have the advantages of high efficiency, energy saving and environmental protection, meet the requirements of green production, will not increase pollution to the environment, save production and hazardous waste treatment costs, and have little impact on the surrounding environment.

[0041] Although the present invention has been described in detail by reference to the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person of ordinary skill in the art may easily think of changes or substitutions within the technical scope disclosed by the present invention, and these shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. An environmentally friendly antistatic water-based ink, characterized in that: The composition comprises the following components in parts by weight: 25-30 parts of colorant, 30-35 parts of water-based self-crosslinking acrylic resin, 2-7 parts of additives, 1-3 parts of silicone-modified water-based polyurethane resin, 25-30 parts of water, and 5-10 parts of conductive polymer solution.

2. The environmentally friendly antistatic water-based ink according to claim 1, characterized in that: The auxiliary agents include a thickener, a wetting agent, a crosslinking agent and a defoaming agent; the weight ratio of the thickener, the wetting agent, the crosslinking agent and the defoaming agent is 1:2:1:

1.

3. The environmentally friendly antistatic water-based ink according to claim 2, characterized in that: The thickener is hydroxyethyl cellulose, the wetting agent is octyl phosphate, the cross-linking agent is trimethylolpropane triacrylate, and the defoaming agent is glyceryl stearate.

4. The environmentally friendly antistatic water-based ink according to claim 1, characterized in that: The conductive polymer solution is a poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) aqueous solution.

5. The environmentally friendly antistatic water-based ink according to claim 2, characterized in that: The environmentally friendly antistatic water-based ink has a viscosity of (8-15) S / coating 3# cup, a fineness of ≤10μm, a pH of 8.2-9.2, and a tinting strength of 95-105%.

6. The environmentally friendly antistatic water-based ink according to claim 1, characterized in that: The preparation process of the environmentally friendly antistatic water-based ink is as follows: first, deionized water, colorant, water-based self-crosslinking acrylic resin, silicone-modified water-based polyurethane resin, and additives are added in sequence according to the formula ratio, and stirred on a high-speed stirrer for 30-40 minutes, and then a grinding and dispersing device is used, and zirconium beads are added, and ground for 2-3 hours to obtain a base ink, and then the base ink and a conductive polymer solution are mixed together according to a ratio, and stirred on a magnetic stirrer for 1-2 hours to finally obtain the environmentally friendly antistatic water-based ink.

7. The printing process of the environmentally friendly antistatic water-based ink according to claim 1, characterized in that: The process is: control the printing roller pressure to 3.5-4kg, the scraper angle to 45°, the scraper pressure to 1.5-2g, and the printing speed to 200-250m / min.

8. The environmentally friendly antistatic water-based ink of claim 1 is used in a substrate to reduce the generation of static electricity.

9. The use according to claim 8, characterized in that The printing substrate includes but is not limited to artificial boards, decorative boards, and paper.

10. The use according to claim 8, characterized in that The process is as follows: Anti-static and environmentally friendly decorative panels are made by using artificial board facing paper printed with environmentally friendly anti-static water-based ink, which is then impregnated with melamine glue and hot-pressed onto plywood, density board or particle board by a press machine.

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