Water tank environmentally friendly fountain solution and preparation method thereof

Abstract

The present invention discloses an environmentally friendly water tank fountain solution and a preparation method thereof, relating to the technical field of fountain solution preparation. The fountain solution comprises, by mass percentage, 3% to 10% ethylene glycol monobutyl ether, 0.5% to 3% ethylene glycol tert-butyl ether, 0.8% to 5% 1,2-propylene glycol, 0.1% to 0.5% sodium citrate, 10% to 91% purified water, and 0.1% to 0.5% defoaming agent. The environmentally friendly water tank fountain solution of the present invention has simple components, high stability, and is environmentally friendly. It also has the characteristics of low surface tension, good wettability, good antibacterial properties, and zero alcohol, thereby ensuring printing effects and printing quality.

Description

Technical Field

[0001] The invention relates to the technical field of fountain solution preparation, and in particular to a water tank environmentally friendly fountain solution and a preparation method thereof. Background Art

[0002] Fountain solution is an important liquid used in the printing process, which can improve the printing quality and efficiency of printed products. When using, the fountain solution is usually fed into the printing system through a circulating water tank.

[0003] Fountain solution is mainly used in offset printing and UV printing. It mainly uses the principle of oil and water being immiscible and the selective adsorption of solids on liquids to act on the blank part of the printing plate, so that the blank part absorbs water due to the action of the fountain agent to form a water film, avoiding the blank part of the printing plate from being infiltrated and contaminated by printing ink during the printing process, preventing dirty plates, and at the same time achieving better printing quality and printing effects.

[0004] At present, in order to reduce the surface tension of water, reduce ink emulsification, inhibit the growth of microorganisms, etc., the existing fountain solution will add a large amount of various chemical additives, especially formaldehyde, alcohol, isopropyl alcohol, preservatives, fungicides, etc. The components are relatively complex, resulting in poor stability of the fountain solution and it is not environmentally friendly. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art. The present invention provides a water tank environmentally friendly fountain solution and a preparation method thereof. The water tank environmentally friendly fountain solution has simple components, high stability, and is environmentally friendly.

[0006] The present invention provides a water tank environmentally friendly fountain solution, which comprises, by mass percentage:

[0007] Ethylene glycol monobutyl ether 3% to 10%, ethylene glycol tert-butyl ether 0.5% to 3%, 1,2-propylene glycol 0.8% to 5%, sodium citrate 0.1% to 0.5%, purified water 10% to 91% and defoaming agent 0.1% to 0.5%.

[0008] Specifically, calculated by mass percentage, it includes:

[0009] Ethylene glycol monobutyl ether 3% to 10%, ethylene glycol tert-butyl ether 0.5% to 3%, 1,2-propylene glycol 0.8% to 5%, sodium citrate 0.1% to 0.5%, purified water 10% to 20% and defoaming agent 0.1% to 0.5%.

[0010] Specifically, calculated by mass percentage, it includes:

[0011] Ethylene glycol monobutyl ether 3% to 10%, ethylene glycol tert-butyl ether 0.5% to 3%, 1,2-propylene glycol 0.8% to 5%, sodium citrate 0.1% to 0.5%, purified water 80% to 91% and defoaming agent 0.1% to 0.5%.

[0012] Specifically, the defoaming agent is an emulsified silicone oil defoaming agent or a modified silicone polyether defoaming agent.

[0013] The present invention also provides a method for preparing a water tank environmentally friendly fountain solution, comprising the following steps:

[0014] S1. Prepare purified water;

[0015] Deionized water is added to a first reactor, and silver beads are added to the first reactor, wherein the silver beads account for 1% to 10% of the total mass of the deionized water; nitrogen gas at 120° C. to 130° C. is introduced into the deionized water in the first reactor for heating for 60 to 120 minutes; after the heating treatment, the temperature of the first reactor is set to 40° C. to 50° C., the deionized water after the heating treatment is cooled to 40° C. to obtain the purified water, and the purified water is kept at a temperature of 40° C. to be used for standby use;

[0016] S2. Set the temperature of the second reactor to 40°C to 50°C and preheat for 5min to 10min;

[0017] S3. Add the formulated amount of purified water and sodium citrate into the preheated second reaction kettle and stir at a temperature of 40° C. to 50° C. for 30 to 60 minutes to obtain a first solution;

[0018] S4, adding the formula amounts of ethylene glycol monobutyl ether and ethylene glycol tert-butyl ether to the first solution in sequence;

[0019] Stirring at a temperature of 40°C to 50°C for 10 to 20 minutes, then setting the temperature of the second reactor to 30°C to 40°C, and stirring at a temperature of 30°C to 40°C for 30 to 60 minutes to obtain a second solution;

[0020] S5. Add the formulated amount of 1,2-propylene glycol to the second solution in sequence, and stir at a temperature of 30° C. to 40° C. for 30 min to 60 min to obtain a third solution;

[0021] S6. Add a formulated amount of defoaming agent to the third solution, and let it stand at a temperature of 30° C. to 40° C. for 60 min to 90 min to obtain a fourth solution;

[0022] S7, setting the temperature of the second reaction kettle to 20° C. to 30° C., and ultrasonically treating the fourth solution at a temperature of 20° C. to 30° C. to obtain a water tank environmentally friendly fountain solution;

[0023] The frequency of the ultrasonic treatment is 15kHz to 30kHz, and the duration of the ultrasonic treatment is 30min to 60min.

[0024] Specifically, in step S3, the pH value of the first solution is controlled within a range of 4-6.

[0025] Specifically, in step S7, the ultrasonic treatment of the fourth solution at a temperature of 20° C. to 30° C. to obtain a water tank environmentally friendly fountain solution includes:

[0026] The first stage: the frequency of the ultrasonic treatment is 15kHz to 20kHz, the duration of the ultrasonic treatment is 10min to 20min, and the ultrasonic treatment is allowed to stand for 5min to 10min after the end of the ultrasonic treatment;

[0027] The second stage: the frequency of the ultrasonic treatment is 20kHz to 25kHz, the duration of the ultrasonic treatment is 10min to 20min, and the ultrasonic treatment is allowed to stand for 5min to 10min after the end of the ultrasonic treatment;

[0028] The third stage: the frequency of the ultrasonic treatment is 25kHz to 30kHz, the duration of the ultrasonic treatment is 10min to 20min, and the ultrasonic treatment is allowed to stand for 5min to 10min after the end of the treatment.

[0029] Specifically, after step S7, the method further includes:

[0030] S8. Introduce nitrogen into the second reactor to increase the pressure of the second reactor to 0.8 MPa to 1.2 MPa, and maintain it for 24 hours.

[0031] Specifically, the environmentally friendly fountain solution in the water tank is intermittently stirred at a pressure of 0.8 MPa to 1.2 MPa.

[0032] Specifically, the intermittent stirring includes:

[0033] Every 2 hours, the environmentally friendly fountain solution in the water tank is stirred at a speed of 60 rpm to 120 rpm for 10 min to 15 min.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The water tank environmentally friendly fountain solution of the present invention has simple components, high stability, and is environmentally friendly, wherein:

[0036] (1) Ethylene glycol monobutyl ether: As a thickener and wetting agent in the water tank environmental protection fountain solution, it helps to increase the viscosity of the water tank environmental protection fountain solution, improve the fluidity and coverage of the water tank environmental protection fountain solution, and help to reduce the surface tension of the water tank environmental protection fountain solution. At the same time, it can also improve the wettability of the water tank environmental protection fountain solution to the printing material, making it easier for the ink to adhere to the printing plate and printing material;

[0037] (2) Ethylene glycol tert-butyl ether: As a thickener in the water tank environmental protection fountain solution, it helps to adjust the viscosity of the water tank environmental protection fountain solution, and can also improve the fluidity and stability of the water tank environmental protection fountain solution, making it easier to apply and operate;

[0038] (3) 1,2-Propanediol: used as a solvent and wetting agent in the water tank environmentally friendly fountain solution, which helps to improve the solubility of other ingredients in the water tank environmentally friendly fountain solution and enhance the wetting performance;

[0039] (4) Sodium citrate: used as a buffer in the water tank environmental protection fountain solution to help adjust the pH value of the water tank environmental protection fountain solution, maintain the stability of the water tank environmental protection fountain solution, and prevent the pH value of the water tank environmental protection fountain solution from changing too much, affecting the performance of the water tank environmental protection fountain solution;

[0040] (5) Purified water: used as a diluent in the water tank environmentally friendly fountain solution. It is the main component of the water tank environmentally friendly fountain solution and is used to dilute other components to form the water tank environmentally friendly fountain solution, and plays a role in dissolving, mixing and stabilizing;

[0041] (6) Defoaming agent: It plays the role of defoaming and suppressing foam in the water tank environmental protection fountain solution, preventing the water tank environmental protection fountain solution from generating foam during the production process, affecting the stability of the fountain solution; it can also prevent the water tank environmental protection fountain solution from generating foam during use, affecting the printing quality;

[0042] The preparation method of the environmentally friendly water tank fountain solution of the present invention achieves stable dissolution of the components through temperature control, stirring, sequential addition of components, and ultrasonic treatment, thereby improving the system stability of the environmentally friendly water tank fountain solution. In addition, trace silver ions are introduced into the purified water to effectively inhibit the growth of microorganisms, further improving the stability of the environmentally friendly water tank fountain solution. Furthermore, the use of the environmentally friendly water tank fountain solution of the present invention can reduce the harm of microorganisms to the water supply system of a printing press.

[0043] The water tank environmentally friendly fountain solution prepared using the formula and preparation method of the water tank environmentally friendly fountain solution of the present invention has the characteristics of simple components, high stability, low surface tension, good wettability, good antibacterial property, zero alcohol, and environmental protection, and can ensure printing effect and printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0045] Figure 1 This is a flow chart of a method for preparing a water tank environmentally friendly fountain solution in an embodiment of the present invention. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0047] The invention provides an environmentally friendly water tank fountain solution, which comprises, by mass percentage, 3% to 10% of ethylene glycol monobutyl ether, 0.5% to 3% of ethylene glycol tert-butyl ether, 0.8% to 5% of 1,2-propylene glycol, 0.1% to 0.5% of sodium citrate, 10% to 91% of purified water, and 0.1% to 0.5% of a defoaming agent.

[0048] The water tank environmentally friendly fountain solution of the present invention has simple components, high stability, and is environmentally friendly, wherein:

[0049] (1) Ethylene glycol monobutyl ether: As a thickener and wetting agent in the water tank environmental protection fountain solution, it helps to increase the viscosity of the water tank environmental protection fountain solution, improve the fluidity and coverage of the water tank environmental protection fountain solution, and help to reduce the surface tension of the water tank environmental protection fountain solution. At the same time, it can also improve the wettability of the water tank environmental protection fountain solution to the printing material, making it easier for the ink to adhere to the printing plate and printing material;

[0050] (2) Ethylene glycol tert-butyl ether: As a thickener in the water tank environmental protection fountain solution, it helps to adjust the viscosity of the water tank environmental protection fountain solution, and can also improve the fluidity and stability of the water tank environmental protection fountain solution, making it easier to apply and operate;

[0051] (3) 1,2-Propanediol: used as a solvent and wetting agent in the water tank environmentally friendly fountain solution, which helps to improve the solubility of other ingredients in the water tank environmentally friendly fountain solution and enhance the wetting performance;

[0052] (4) Sodium citrate: used as a buffer in the water tank environmental protection fountain solution to help adjust the pH value of the water tank environmental protection fountain solution, maintain the stability of the water tank environmental protection fountain solution, and prevent the pH value of the water tank environmental protection fountain solution from changing too much, affecting the performance of the water tank environmental protection fountain solution;

[0053] (5) Purified water: used as a diluent in the water tank environmentally friendly fountain solution. It is the main component of the water tank environmentally friendly fountain solution and is used to dilute other components to form the water tank environmentally friendly fountain solution, and plays a role in dissolving, mixing and stabilizing;

[0054] (6) Defoaming agent: It plays the role of defoaming and suppressing foam in the water tank environmental protection fountain solution, preventing the water tank environmental protection fountain solution from generating foam during the production process, affecting the stability of the fountain solution; it can also prevent the water tank environmental protection fountain solution from generating foam during use, affecting the printing quality;

[0055] The preparation method of the environmentally friendly water tank fountain solution of the present invention achieves stable dissolution of the components through temperature control, stirring, sequential addition of components, and ultrasonic treatment, thereby improving the system stability of the environmentally friendly water tank fountain solution. In addition, trace silver ions are introduced into the purified water to effectively inhibit the growth of microorganisms, further improving the stability of the environmentally friendly water tank fountain solution. Furthermore, the use of the environmentally friendly water tank fountain solution of the present invention can reduce the harm of microorganisms to the water supply system of a printing press.

[0056] The water tank environmentally friendly fountain solution prepared using the formula and preparation method of the water tank environmentally friendly fountain solution of the present invention has the characteristics of simple components, high stability, low surface tension, good wettability, good antibacterial property, zero alcohol, and environmental protection, and can ensure printing effect and printing quality.

[0057] In addition, since the water tank environmentally friendly fountain solution of the present invention contains zero alcohol and does not require the addition of additional alcohol or isopropyl alcohol during use, low volatile organic compound emissions are achieved, environmental pollution is small, and it is more in line with the requirements of environmental protection and safe production; it can also enable manufacturers to avoid equipment and facilities for alcohol preparation and storage, thereby reducing production costs; the water tank environmentally friendly fountain solution does not contain highly volatile and flammable liquids such as ethanol and isopropyl alcohol, which is beneficial to reducing the risk of fire and explosion, and reduces vapor inhalation by workers, reduces irritation to human skin, and reduces harm to the human body; the water tank environmentally friendly fountain solution does not contain formaldehyde, phenol, and other substances that are significantly toxic to humans, which is beneficial to the health of users.

[0058] In some specific embodiments, the water tank environmentally friendly fountain solution includes, by mass percentage, 3% to 10% of ethylene glycol monobutyl ether, 0.5% to 3% of ethylene glycol tert-butyl ether, 0.8% to 5% of 1,2-propylene glycol, 0.1% to 0.5% of sodium citrate, 10% to 20% of purified water and 0.1% to 0.5% of defoaming agent.

[0059] This is a concentrated water tank environmentally friendly fountain solution formula. The concentrated water tank environmentally friendly fountain solution can save packaging materials, transportation costs, etc., and is more environmentally friendly. When using, dilute the concentrated water tank environmentally friendly fountain solution 4 to 9 times with deionized water, soft water or distilled water.

[0060] In some specific embodiments, the water tank environmentally friendly fountain solution includes, by mass percentage, 3% to 10% of ethylene glycol monobutyl ether, 0.5% to 3% of ethylene glycol tert-butyl ether, 0.8% to 5% of 1,2-propylene glycol, 0.1% to 0.5% of sodium citrate, 80% to 91% of purified water and 0.1% to 0.5% of defoaming agent.

[0061] This is a non-concentrated water tank environmentally friendly fountain solution formula. It does not need to be diluted and can be used directly, which is more convenient and quicker for users. Moreover, in this non-concentrated formula, the mass percentage of purified water is ≥80%, which is much larger than the water ratio of ordinary fountain solutions sold on the market, that is, the proportion of added components is relatively small, which is more environmentally friendly.

[0062] In some specific embodiments, the defoaming agent is an emulsified silicone oil defoaming agent or a modified silicone polyether defoaming agent, which belongs to the silicone defoaming agent, has good defoaming and anti-foaming properties, is acid-resistant, and is suitable for use in water tank environmentally friendly fountain solution of water system.

[0063] Figure 1 The flow chart of the method for preparing the water tank environmentally friendly fountain solution in an embodiment of the present invention is shown, which includes the following steps:

[0064] S1. Prepare purified water;

[0065] Deionized water is added into a first reactor, and silver beads are added into the first reactor, wherein the silver beads account for 1% to 10% of the total mass of the deionized water; nitrogen gas at 120° C. to 130° C. is introduced into the deionized water in the first reactor for heating treatment for 60 min to 120 min; after the heating treatment, the temperature of the first reactor is set to 40° C. to 50° C., the deionized water after the heating treatment is cooled to 40° C. to obtain the purified water, and the purified water is kept warm at a temperature of 40° C. to 50° C. for standby use.

[0066] Although there are few anions and cations in deionized water, microorganisms and soluble organic matter are still present, and the microorganisms still have a basis for reproduction and spread. Sterilization and oxygen removal can be achieved by introducing nitrogen gas at 120°C to 130°C and heating it for 60 minutes to 120 minutes. Moreover, the hot nitrogen gas is directly introduced into the deionized water, which has higher heating efficiency, better microbial killing effect and better oxygen removal effect. The nitrogen gas also stirs the deionized water, and then stirs the silver beads in the deionized water, causing the silver beads to collide and rub against the inner wall of the first reactor, promoting the shedding of silver ions from the silver beads and dissolving them in the hot deionized water, effectively improving the antibacterial ability of the deionized water. The silver beads can be reused at a low cost.

[0067] S2. Set the temperature of the second reactor to 40°C to 50°C and preheat for 5min to 10min;

[0068] First, preheat the second reactor to a temperature close to that of the purified water. On the one hand, this ensures that the temperature of the purified water will not change drastically after entering the second reactor. On the other hand, it provides good temperature conditions for the purified water to dissolve other components, which is conducive to improving the dissolution efficiency and dissolution stability of other components.

[0069] S3. Add the formulated amount of purified water and sodium citrate into the preheated second reaction kettle and stir at a temperature of 40° C. to 50° C. for 30 to 60 minutes to obtain a first solution;

[0070] Stirring at a temperature of 40° C. to 50° C. for 30 to 60 minutes can promote the full dissolution and dispersion of sodium citrate, and the pH value of the formed first solution is stable. In addition, dissolving sodium citrate first can provide a good solution environment for the subsequent addition and dissolution of ethylene glycol monobutyl ether and ethylene glycol tert-butyl ether.

[0071] Furthermore, the pH value of the first solution is controlled at 4 to 6, and the pH value of the first solution is reduced to 4 to 6 by adding citric acid, so that the final fountain solution product is acidic. The fountain solution maintains a certain acidity, can well form a new hydrophilic salt layer during the printing process, and promptly repair the damaged hydrophilic layer, and is less likely to have problems such as flowery plates and sticky plates.

[0072] S4, adding the formula amounts of ethylene glycol monobutyl ether and ethylene glycol tert-butyl ether to the first solution in sequence;

[0073] Stirring at a temperature of 40°C to 50°C for 10 to 20 minutes, then setting the temperature of the second reactor to 30°C to 40°C, and stirring at a temperature of 30°C to 40°C for 30 to 60 minutes to obtain a second solution;

[0074] The mixture is stirred at a temperature of 40° C. to 50° C. for 10 to 20 minutes to fully dissolve ethylene glycol monobutyl ether and ethylene glycol tert-butyl ether in the first solution; and then stirred at a temperature of 30° C. to 40° C. for 30 to 60 minutes to improve the stability of ethylene glycol monobutyl ether and ethylene glycol tert-butyl ether after being dissolved in the first solution to obtain a second solution.

[0075] S5. Add the formulated amount of 1,2-propylene glycol to the second solution in sequence, and stir at a temperature of 30° C. to 40° C. for 30 min to 60 min to obtain a third solution;

[0076] The mixture is stirred at a temperature of 30° C. to 40° C. for 30 to 60 minutes to promote sufficient diffusion of 1,2-propylene glycol in the second solution, so that the obtained third solution has good stability.

[0077] S6. Add a formulated amount of defoaming agent to the third solution, and let it stand at a temperature of 30° C. to 40° C. for 60 min to 90 min to obtain a fourth solution;

[0078] After adding the defoaming agent, the solution is allowed to stand at a temperature of 30°C to 40°C for 60 to 90 minutes to allow the defoaming agent to fully and freely diffuse in the third solution. This can eliminate the generated foam and help maintain the stability of the solution system.

[0079] S7, setting the temperature of the second reaction kettle to 20° C. to 30° C., and ultrasonically treating the fourth solution at a temperature of 20° C. to 30° C. to obtain a water tank environmentally friendly fountain solution;

[0080] The frequency of the ultrasonic treatment is 15kHz to 30kHz, and the duration of the ultrasonic treatment is 30min to 60min.

[0081] The strong cavitation effect of ultrasonic treatment promotes further mixing of the components in the fourth solution. When the ultrasonic wave propagates in the fourth solution, the high temperature, high pressure and shock wave generated by cavitation break the balance of action between the molecules in the solution, reduce the intermolecular attraction and lower the surface tension. When the ultrasonic action exceeds a certain time, the molecules in the solution reach another balance again, and a water tank environmentally friendly fountain solution with low surface tension and good wettability is obtained.

[0082] Specifically, the ultrasonic treatment of the fourth solution at a temperature of 20° C. to 30° C. to obtain the water tank environmentally friendly fountain solution comprises:

[0083] The first stage: the frequency of the ultrasonic treatment is 15kHz to 20kHz, the duration of the ultrasonic treatment is 10min to 20min, and the ultrasonic treatment is allowed to stand for 5min to 10min after the end of the ultrasonic treatment;

[0084] The second stage: the frequency of the ultrasonic treatment is 20kHz to 25kHz, the duration of the ultrasonic treatment is 10min to 20min, and the ultrasonic treatment is allowed to stand for 5min to 10min after the end of the ultrasonic treatment;

[0085] The third stage: the frequency of the ultrasonic treatment is 25kHz to 30kHz, the duration of the ultrasonic treatment is 10min to 20min, and the ultrasonic treatment is allowed to stand for 5min to 10min after the end of the treatment.

[0086] The fourth solution is ultrasonically treated in stages, so that a new equilibrium between molecules in the fourth solution is gradually and steadily established, thereby ensuring that the surface tension of the fourth solution is steadily reduced and the wettability is steadily improved.

[0087] Furthermore, after step S7, the method further includes:

[0088] S8. Introduce nitrogen into the second reactor to increase the pressure of the second reactor to 0.8 MPa to 1.2 MPa, and maintain it for 24 hours.

[0089] Nitrogen has a high degree of chemical stability. By pressurizing the water tank environmentally friendly fountain solution in the second reactor with nitrogen, oxygen, carbon dioxide, etc. can be prevented from dissolving into the water tank environmentally friendly fountain solution; maintaining it at 0.8MPa~1.2MPa for 24 hours can increase the solubility of nitrogen in the water tank environmentally friendly fountain solution. On the one hand, it can replace the dissolved oxygen in the water tank environmentally friendly fountain solution. On the other hand, the nitrogen dissolved in the water tank environmentally friendly fountain solution will continue to escape. In the subsequent filling process, the nitrogen escaped can fill the pipes, filling machine cylinders, and packaging containers, allowing the filling process to be carried out under the protection of nitrogen, avoiding the re-dissolution of oxygen in the subsequent filling process of the water tank environmentally friendly fountain solution, further effectively inhibiting the growth of aerobic microorganisms, thereby ensuring the stability of the water tank environmentally friendly fountain solution, and then helping to maintain the low surface tension and good wettability of the water tank environmentally friendly fountain solution.

[0090] In some specific embodiments, intermittent stirring of the water tank environmentally friendly fountain solution at a pressure of 0.8 MPa to 1.2 MPa is beneficial to maintaining the balance of the solution system and promoting the dissolution of nitrogen into the water tank environmentally friendly fountain solution.

[0091] Specifically, the intermittent stirring includes stirring the environmentally friendly fountain solution in the water tank at a speed of 60 rpm to 120 rpm for 10 min to 15 min every 2 hours, which is more energy-efficient.

[0092] Example 1

[0093] A water tank environmentally friendly fountain solution comprises, by mass percentage, 3% of ethylene glycol monobutyl ether, 0.5% of ethylene glycol tert-butyl ether, 0.8% of 1,2-propylene glycol, 0.1% of sodium citrate, 80% of purified water and 0.1% of modified silicone polyether defoaming agent.

[0094] Example 2

[0095] A water tank environmentally friendly fountain solution comprises, by mass percentage, 6.5% of ethylene glycol monobutyl ether, 2% of ethylene glycol tert-butyl ether, 3% of 1,2-propylene glycol, 0.3% of sodium citrate, 85% of purified water and 0.2% of modified silicone polyether defoaming agent.

[0096] Example 3

[0097] A water tank environmentally friendly fountain solution comprises, by mass percentage, 10% of ethylene glycol monobutyl ether, 3% of ethylene glycol tert-butyl ether, 5% of 1,2-propylene glycol, 0.5% of sodium citrate, 91% of purified water and 0.5% of a modified silicone polyether defoaming agent.

[0098] Example 1, Example 2 and Example 3 were all prepared using the same preparation method:

[0099] A method for preparing a water tank environmentally friendly fountain solution comprises the following steps:

[0100] (1) preparing purified water;

[0101] Deionized water is added to a first reactor, and silver beads are added to the first reactor, wherein the silver beads account for 5% of the total mass of the deionized water; nitrogen gas at 125° C. is introduced into the deionized water in the first reactor for heating for 90 minutes; after the heating treatment, the temperature of the first reactor is set to 45° C., and the deionized water after the heating treatment is cooled to 45° C. to obtain the purified water, which is then kept at 45° C. for later use;

[0102] (2) Set the temperature of the second reactor to 45°C and preheat for 7.5 minutes;

[0103] (3) adding the formulated amount of purified water and sodium citrate into the preheated second reaction kettle and stirring at 45° C. for 45 minutes to obtain a first solution; controlling the pH value of the first solution to be between 4.5 and 5.5;

[0104] (4) adding the formulated amount of ethylene glycol monobutyl ether and ethylene glycol tert-butyl ether to the first solution in sequence, stirring at a temperature of 45° C. for 15 minutes, then setting the temperature of the second reactor to 35° C., stirring at a temperature of 35° C. for 45 minutes to obtain a second solution;

[0105] (5) adding the formulated amount of 1,2-propylene glycol to the second solution in sequence, and stirring at 35° C. for 45 minutes to obtain a third solution;

[0106] (6) adding a formulated amount of defoaming agent to the third solution, and allowing the solution to stand at 35° C. for 75 minutes to obtain a fourth solution;

[0107] (7) setting the temperature of the second reactor to 25° C., and ultrasonically treating the fourth solution at 25° C. to obtain a water tank environmentally friendly fountain solution;

[0108] The first stage: the frequency of the ultrasonic treatment is 17 kHz, the duration of the ultrasonic treatment is 15 minutes, and the ultrasonic treatment is left to stand for 7 minutes after the end of the ultrasonic treatment;

[0109] The second stage: the frequency of the ultrasonic treatment is 22 kHz, the duration of the ultrasonic treatment is 15 minutes, and the ultrasonic treatment is left to stand for 7 minutes after the end of the ultrasonic treatment;

[0110] The third stage: the frequency of the ultrasonic treatment is 27 kHz, the duration of the ultrasonic treatment is 15 minutes, and the ultrasonic treatment is left to stand for 7 minutes after the end of the ultrasonic treatment;

[0111] (8) nitrogen was introduced into the second reactor to increase the pressure of the second reactor to 1.0 MPa and maintain the pressure for 24 h;

[0112] Every 2 hours, the environmentally friendly fountain solution in the water tank was stirred at a speed of 90 rpm for 12 minutes.

[0113] Performance Testing

[0114] Equal amounts of the water tank environmentally friendly fountain solutions of Example 1, Example 2, and Example 3 were taken to measure surface tension, VOC emissions, conductivity, and antibacterial rate. The results are recorded in Table 1.

[0115]

[0116] Inhibition rate (%) = (positive control OD value - test OD value) / (positive control OD value - negative control OD value) * 100.

[0117] As can be seen from Table 1, the surface tension of the water tank environmentally friendly fountain solution of the present invention is low and lower than 40mN / m (ideally 35-42mN / cm); the VOC emission is low and lower than 150g / L (the VOC emission limit requirement is ≤300g / L); the conductivity is between 600-800μs / cm, the wettability is high; and the antibacterial rate is greater than 90%.

[0118] The environmentally friendly water tank fountain solution of the present invention has simple components and can maintain sufficient stability while maintaining low surface tension, high wettability, and strong antibacterial properties, thereby ensuring printing effects and printing quality. The environmentally friendly water tank fountain solution does not contain substances such as formaldehyde and phenol that are significantly toxic to humans, thereby benefiting the health of users. The environmentally friendly water tank fountain solution also does not contain highly volatile and flammable liquids such as ethanol and isopropyl alcohol, thereby reducing the risks of fire and explosion.

[0119] The environmentally friendly water tank fountain solution of the present invention does not contain alcohol and does not require the addition of additional alcohol or isopropyl alcohol during use, thereby achieving low volatile organic compound (VOC) emissions, causing little pollution to the environment, and better meeting the requirements of environmental protection and safe production. It can also enable manufacturers to avoid equipment and facilities for alcohol preparation and storage, thereby reducing production costs; it also reduces vapor inhalation by workers, reducing harm to human health; and it also reduces irritation to human skin.

[0120] In addition, a large number of actual production applications have proved that the water tank environmentally friendly fountain solution of the present invention can effectively reduce ink consumption, increase printing sales, and save production costs.

[0121] The above is a detailed introduction to a water tank environmentally friendly fountain solution and a preparation method thereof provided in an embodiment of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for general technical personnel in this field, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A water tank environmentally friendly fountain solution, characterized in that: In terms of percentage by mass, it includes: Ethylene glycol monobutyl ether 3% to 10%, ethylene glycol tert-butyl ether 0.5% to 3%, 1,2-propylene glycol 0.8% to 5%, sodium citrate 0.1% to 0.5%, purified water 10% to 91% and defoaming agent 0.1% to 0.5%; Wherein, the purified water is prepared by the following method: Deionized water is added into a first reactor, and silver beads are added into the first reactor, wherein the silver beads account for 1% to 10% of the total mass of the deionized water; nitrogen gas at 120° C. to 130° C. is introduced into the deionized water in the first reactor and heated for 60 min to 120 min; after the heating treatment is completed, the temperature of the first reactor is set to 40° C. to 50° C., and the deionized water after the heating treatment is cooled to 40° C. to obtain the purified water.

2. The water tank environmentally friendly fountain solution according to claim 1, characterized in that: In terms of percentage by mass, it includes: Ethylene glycol monobutyl ether 3%-10%, ethylene glycol tert-butyl ether 0.5%-3%, 1,2-propylene glycol 0.8%-5%, sodium citrate 0.1%-0.5%, purified water 80%-91% and defoaming agent 0.1%-0.5%.

3. The water tank environmentally friendly fountain solution according to claim 1, characterized in that: The defoaming agent is an emulsified silicone oil defoaming agent or a modified silicone polyether defoaming agent.

4. A method for preparing a water tank environmentally friendly fountain solution, characterized in that: The following steps are involved: S1. Prepare purified water; Deionized water is added to a first reactor, and silver beads are added to the first reactor, wherein the silver beads account for 1% to 10% of the total mass of the deionized water; nitrogen gas at 120° C. to 130° C. is introduced into the deionized water in the first reactor for heating for 60 min to 120 min; after the heating treatment, the temperature of the first reactor is set to 40° C. to 50° C., the deionized water after the heating treatment is cooled to 40° C. to obtain the purified water, and the purified water is kept at a temperature of 40° C. to 50° C. for standby use; S2. Set the temperature of the second reactor to 40°C to 50°C and preheat for 5min to 10min; S3. Add the formulated amount of purified water and sodium citrate into the preheated second reaction kettle and stir at a temperature of 40° C. to 50° C. for 30 to 60 minutes to obtain a first solution; S4, adding the formula amounts of ethylene glycol monobutyl ether and ethylene glycol tert-butyl ether to the first solution in sequence; Stirring at a temperature of 40°C to 50°C for 10 to 20 minutes, then setting the temperature of the second reactor to 30°C to 40°C, and stirring at a temperature of 30°C to 40°C for 30 to 60 minutes to obtain a second solution; S5. Add the formulated amount of 1,2-propylene glycol to the second solution in sequence, and stir at a temperature of 30° C. to 40° C. for 30 min to 60 min to obtain a third solution; S6. Add a formulated amount of defoaming agent to the third solution, and let it stand at a temperature of 30° C. to 40° C. for 60 min to 90 min to obtain a fourth solution; S7, setting the temperature of the second reaction kettle to 20° C. to 30° C., and ultrasonically treating the fourth solution at a temperature of 20° C. to 30° C. to obtain a water tank environmentally friendly fountain solution; The frequency of the ultrasonic treatment is 15kHz to 30kHz, and the duration of the ultrasonic treatment is 30min to 60min; The water tank environmentally friendly fountain solution includes, by mass percentage, 3% to 10% of ethylene glycol monobutyl ether, 0.5% to 3% of ethylene glycol tert-butyl ether, 0.8% to 5% of 1,2-propylene glycol, 0.1% to 0.5% of sodium citrate, 10% to 91% of purified water, and 0.1% to 0.5% of a defoaming agent.

5. The method for preparing the water tank environmentally friendly fountain solution according to claim 4, characterized in that: In step S3, the pH value of the first solution is controlled within a range of 4-6.

6. The method for preparing the water tank environmentally friendly fountain solution according to claim 4, characterized in that: In step S7, the ultrasonic treatment of the fourth solution at a temperature of 20° C. to 30° C. to obtain a water tank environmentally friendly fountain solution comprises: The first stage: the frequency of the ultrasonic treatment is 15kHz~20kHz, the duration of the ultrasonic treatment is 10min~20min, and the ultrasonic treatment is left to stand for 5min~10min after the end of the ultrasonic treatment; The second stage: the frequency of the ultrasonic treatment is 20kHz~25kHz, the duration of the ultrasonic treatment is 10min~20min, and the ultrasonic treatment is allowed to stand for 5min~10min after the end of the ultrasonic treatment; The third stage: the frequency of the ultrasonic treatment is 25kHz~30kHz, the duration of the ultrasonic treatment is 10min~20min, and the ultrasonic treatment is allowed to stand for 5min~10min after the end of the ultrasonic treatment.

7. The method for preparing the water tank environmentally friendly fountain solution according to claim 4, characterized in that: After step S7, the method further includes: S8. Introduce nitrogen into the second reactor to increase the pressure of the second reactor to 0.8 MPa to 1.2 MPa, and maintain it for 24 hours.

8. The method for preparing the water tank environmentally friendly fountain solution according to claim 7, characterized in that: The environmentally friendly fountain solution in the water tank is intermittently stirred at a pressure of 0.8 MPa to 1.2 MPa.

9. The method for preparing the water tank environmentally friendly fountain solution according to claim 8, characterized in that: The intermittent stirring comprises: Every 2 hours, the environmentally friendly fountain solution in the water tank is stirred at a speed of 60 rpm to 120 rpm for 10 min to 15 min.

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