Quick-drying type alcohol-free fountain solution and preparation method thereof

Abstract

The invention relates to the technical field of fountain solution preparation, and discloses a quick-drying type alcohol-free fountain solution and a preparation method thereof.The quick-drying type alcohol-free fountain solution comprises 0.2-0.5 part of a defoaming aid for a water-based system, 2.0-4.0 parts of an alkaline buffer agent, 10-15 parts of a cleaning dispersant, 5-8 parts of a protective aid, 5-10 parts of a surfactant, 1-3 parts of magnesium sulfate, 1-3 parts of glucose, 30-40 parts of glycerin, 20-30 parts of PGME, 2-5 parts of a bactericide, 0.2-0.5 part of a volatilization promoting additive and a proper amount of deionized water; according to the invention, most of green and environment-friendly raw materials are proportioned for preparation, good wettability, high drying speed and excellent environment-friendly characteristic are realized through the synergistic effect of the alkalescent buffer agent, the nonionic surfactant, the PGME and the dimethyl acetal, and meanwhile, the bio-based bactericide and the nonionic surfactant are applied, so that the environment-friendly and environment-friendly effects are realized. And the safety and environmental protection property of the product are further improved, and the requirements of the modern printing industry for green, efficient and safe production are met.

Description

Technical Field

[0001] The present application relates to the field of fountain solution preparation, and in particular to a quick-drying alcohol-free fountain solution and a preparation method thereof. Background Art

[0002] In the color printing industry, fountain solution is a key chemical additive that is crucial to ensuring printing quality. Traditionally, fountain solution often contains alcohol components such as isopropyl alcohol, which plays an important role in improving the wetting effect and reducing the temperature of the printing plate. With the development of the printing industry, alcohol-free fountain solution, as an important printing auxiliary material, is widely used in the offset printing process to reduce the accumulation of ink on the printing plate and adjust the water-ink balance.

[0003] Although the all-purpose alcohol-free fountain solution in the existing technology meets the requirements of environmental protection and printing quality to a certain extent, it still has several shortcomings. First, the ingredients in some formulas are complex and contain flammable and volatile substances, which are potentially harmful to the environment and human health and do not meet the increasingly stringent environmental protection requirements; secondly, the traditional formula has average performance in quick-drying performance, especially in high humidity or low temperature environments, the ink drying time is long, which affects the printing efficiency and the quality of the finished product, and increases the maintenance cost and difficulty during the printing process. Summary of the invention

[0004] In order to solve the environmental, health and safety risks caused by the alcohol component in the fountain solution in the prior art, the present application provides a quick-drying alcohol-free fountain solution and a preparation method thereof.

[0005] The present application provides a quick-drying alcohol-free fountain solution and a preparation method thereof using the following technical solutions

[0006] A quick-drying alcohol-free fountain solution comprises 0.2-0.5 parts of a defoaming agent for an aqueous system, 2.0-4.0 parts of an alkaline buffer, 10-15 parts of a cleaning dispersant, 5-8 parts of a protective agent, 5-10 parts of a surfactant, 1-3 parts of magnesium sulfate, 1-3 parts of glucose, 30-40 parts of glycerol, 20-30 parts of PGME, 2-5 parts of a bactericide, 0.2-0.5 parts of a volatilization-promoting additive, and an appropriate amount of deionized water.

[0007] Preferably, the alkaline buffer is a weakly alkaline buffer for adjusting the pH value of the solvent.

[0008] Preferably, the cleaning dispersant is a polycarboxylate.

[0009] Preferably, the defoaming aid for the aqueous system is a silicone defoaming agent.

[0010] Preferably, the protective auxiliary agent is a phosphate compound.

[0011] Preferably, the surfactant is a nonionic surfactant, such as the preparation process of alkyl polyglycoside:

[0012] 1. In a reactor, fatty alcohol (such as lauryl alcohol) and glucose are mixed, and in the presence of a catalyst (such as sulfuric acid), the fatty alcohol and glucose are reacted at 120-160°C, and the ratio of fatty alcohol to glucose is about 1:1.5-2.0;

[0013] 2. After the reaction is completed, the product is separated by distillation or crystallization;

[0014] 3. further purifying the product by recrystallization or other physical methods;

[0015] 4. Finally, alkyl glycoside is obtained.

[0016] Preferably, the bactericide is a bio-based bactericide, such as chitosan, and the preparation method comprises the following steps:

[0017] 1. In a reactor, heat and dissolve chitosan in a suitable solvent (such as acetic acid);

[0018] 2. Add a certain amount of alkali (such as sodium hydroxide) and react at 60-70°C for several hours to partially deacetylate chitin into chitosan. The ratio of chitin to sodium hydroxide is about 1:0.2-0.3.

[0019] 3. After the reaction is completed, use acid (such as acetic acid) to neutralize the excess base and adjust the pH value to neutral;

[0020] 4. Filter or centrifuge to obtain chitosan precipitate, and then wash with water for several times until the washing liquid is neutral;

[0021] 5. Dry the chitosan at 50-60°C to constant weight, and finally grind the dried chitosan into powder.

[0022] Preferably, the volatilization promoting additive is dimethyl acetal, and the preparation method of dimethyl acetal comprises the following steps:

[0023] 1. Under the action of a catalyst (such as an acidic ion exchange resin), ethanol and formaldehyde are reacted at 120-160°C, and the ratio of ethanol to formaldehyde is about 1:1;

[0024] 2. further purifying the product by distillation, fractionation, etc.;

[0025] 3. Obtain purified dimethyl acetal.

[0026] A method for preparing a quick-drying alcohol-free fountain solution comprises the following steps:

[0027] 1. Prepare all raw materials according to the above recipe;

[0028] 2. Add defoaming agent, alkaline buffer, cleaning dispersant, protective agent, surfactant, magnesium sulfate, glucose, glycerol, PGME and deionized water into the reactor according to the formula ratio, and gradually heat to 50-60°C under stirring to help the components to be fully dissolved and mixed;

[0029] 3. After the mixture is cooled to room temperature, add the bio-based fungicide and the volatilization-promoting additive and continue to stir evenly;

[0030] 4. Use a weak alkaline buffer to adjust the pH value of the solution to an appropriate range (usually 8-10), and use ultrasonic dispersion to disperse evenly;

[0031] 5. Filter the mixture through a filter to remove any undissolved solid particles;

[0032] 6. Put the filtered liquid into a sealed container to obtain a quick-drying alcohol-free fountain solution. In summary, this application includes the following beneficial technical effects

[0033] 1. Through the synergistic effect of PGME and dimethyl acetal, the azeotropic effect is used to effectively promote the volatilization of the solvent, achieve rapid drying of the ink, and improve printing production efficiency;

[0034] 2. The pH value of the solution is accurately controlled by combining weak alkaline buffer and non-ionic surfactant, which improves the stability of the pH value of the fountain solution, ensures the stability and color reproduction of the printing process, and extends the service life;

[0035] 3. The combined use of bio-based fungicides, glucose and glycerol, and non-ionic surfactants not only ensures the environmental friendliness of the solution, but also enhances its stability and moisturizing properties, ensuring that the product is safe and environmentally friendly and reduces negative impacts on the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a data table of partial performance test of the fountain solution in the application example. DETAILED DESCRIPTION

[0037] The embodiment of the present application discloses a quick-drying alcohol-free fountain solution and a preparation method thereof. A quick-drying alcohol-free fountain solution comprises 0.2 to 0.5 parts of a defoaming agent for an aqueous system, 2.0 to 4.0 parts of an alkaline buffer, 10 to 15 parts of a cleaning dispersant, 5 to 8 parts of a protective agent, 5 to 10 parts of a surfactant, 1 to 3 parts of magnesium sulfate, 1 to 3 parts of glucose, 30 to 40 parts of glycerol, 20 to 30 parts of PGME, 2 to 5 parts of a bactericide, 0.2 to 0.5 parts of a volatilization-promoting additive, and 160 to 170 parts of deionized water;

[0038] The alkaline buffer is a weak alkaline buffer such as sodium bicarbonate.

[0039] The surfactant is a nonionic surfactant such as alkyl polyglycoside.

[0040] The volatilization-promoting additive is dimethyl acetal, which utilizes the azeotropic effect to effectively promote the volatilization of the solvent, achieve rapid drying, and improve production efficiency.

[0041] The fungicide used should be a bio-based fungicide, such as chitosan.

[0042] The cleaning dispersant is polycarboxylate.

[0043] The defoaming aid for water-based systems is selected from silicone defoamers, such as polydimethylsiloxane.

[0044] The protective auxiliary agent is a phosphate compound, such as sodium phosphate or potassium phosphate.

[0045] Preparation process of alkyl glycosides:

[0046] 1. In a reactor, fatty alcohol (such as lauryl alcohol) and glucose are mixed, and in the presence of a catalyst (such as sulfuric acid), the fatty alcohol and glucose are reacted at 120-160°C, and the ratio of fatty alcohol to glucose is about 1:1.5-2.0;

[0047] 2. After the reaction is completed, the product is separated by distillation or crystallization;

[0048] 3. further purifying the product by recrystallization or other physical methods;

[0049] 4. Finally, alkyl glycoside is obtained.

[0050] The preparation method of chitosan comprises the following steps:

[0051] 1. In a reactor, heat and dissolve chitosan in a suitable solvent (such as acetic acid);

[0052] 2. Add a certain amount of alkali (such as sodium hydroxide) and react at 60-70°C for several hours to partially deacetylate chitin into chitosan. The ratio of chitin to sodium hydroxide is about 1:0.2-0.3.

[0053] 3. After the reaction is completed, use acid (such as acetic acid) to neutralize the excess base and adjust the pH value to neutral;

[0054] 4. Filter or centrifuge to obtain chitosan precipitate, and then wash with water for several times until the washing liquid is neutral;

[0055] 5. Dry the chitosan at 50-60°C to constant weight, and finally grind the dried chitosan into powder.

[0056] The preparation method of dimethyl acetal comprises the following steps:

[0057] 1. Under the action of a catalyst (such as an acidic ion exchange resin), ethanol and formaldehyde are reacted at 120-160°C, and the ratio of ethanol to formaldehyde is about 1:1;

[0058] 2. further purifying the product by distillation, fractionation, etc.;

[0059] 3. Obtain purified dimethyl acetal.

[0060] The preparation method of the quick-drying alcohol-free fountain solution comprises the following steps:

[0061] 1. Prepare all raw materials according to the recipe;

[0062] 2. Add defoaming agent, alkaline buffer, cleaning dispersant, protective agent, surfactant, magnesium sulfate, glucose, glycerol, PGME and deionized water into the reactor according to the formula ratio, and gradually heat to 50-60°C under stirring to help the components to be fully dissolved and mixed;

[0063] 3. After the mixture is cooled to room temperature, add the bio-based fungicide and the volatilization-promoting additive and continue to stir evenly;

[0064] 4. Use a weak alkaline buffer to adjust the pH value of the solution to an appropriate range (usually 8-10), and use ultrasonic dispersion to disperse evenly;

[0065] 5. Filter the mixture through a filter to remove any undissolved solid particles;

[0066] 6. Put the filtered liquid into a sealed container to obtain the quick-drying alcohol-free fountain solution.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A quick-drying alcohol-free fountain solution, comprising 0.2-0.5 parts of a defoaming agent for an aqueous system, 2.0-4.0 parts of an alkaline buffer, 10-15 parts of a cleaning dispersant, 5-8 parts of a protective agent, 5-10 parts of a surfactant, 1-3 parts of magnesium sulfate, 1-3 parts of glucose, 30-40 parts of glycerol, 20-30 parts of PGME, 2-5 parts of a bactericide, 0.2-0.5 parts of a volatilization-promoting additive, and an appropriate amount of deionized water.

2. The quick-drying alcohol-free fountain solution according to claim 1, characterized in that: The alkaline buffer is a weakly alkaline buffer, which is used to adjust the pH value of the solvent.

3. The quick-drying alcohol-free fountain solution according to claim 2, characterized in that: The cleaning dispersant is polycarboxylate.

4. The quick-drying alcohol-free fountain solution according to claim 3, characterized in that: The defoaming aid for the water-based system is a silicone defoaming agent.

5. The quick-drying alcohol-free fountain solution according to claim 4, characterized in that: The protective auxiliary agent is a phosphate compound.

6. The quick-drying alcohol-free fountain solution according to claim 5, characterized in that: The surfactant is a nonionic surfactant, such as the preparation process of alkyl polyglycoside:

1. In a reactor, fatty alcohol (such as lauryl alcohol) and glucose are mixed, and in the presence of a catalyst (such as sulfuric acid), the fatty alcohol and glucose are reacted at 120-160°C, and the ratio of fatty alcohol to glucose is about 1:1.5-2.0; 2. After the reaction is completed, the product is separated by distillation or crystallization; 3. further purifying the product by recrystallization or other physical methods; 4. Finally, alkyl glycoside is obtained.

7. The quick-drying alcohol-free fountain solution according to claim 6, characterized in that: The bactericide is a bio-based bactericide, and the preparation method of chitosan comprises the following steps:

1. In a reactor, heat and dissolve chitosan in a suitable solvent (such as acetic acid); 2. Add a certain amount of alkali (such as sodium hydroxide) and react at 60-70°C for several hours to partially deacetylate chitin into chitosan. The ratio of chitin to sodium hydroxide is about 1:0.2-0.

3.

3. After the reaction is completed, use acid (such as acetic acid) to neutralize the excess base and adjust the pH value to neutral; 4. Filter or centrifuge to obtain chitosan precipitate, and then wash with water for several times until the washing liquid is neutral; 5. Dry the chitosan at 50-60°C to constant weight, and finally grind the dried chitosan into powder.

8. The quick-drying alcohol-free fountain solution according to claim 7, characterized in that: The volatilization promoting additive is dimethyl acetal, and the preparation method of dimethyl acetal comprises the following steps:

1. Under the action of a catalyst (such as an acidic ion exchange resin), ethanol and formaldehyde are reacted at 120-160°C, and the ratio of ethanol to formaldehyde is about 1:1; 2. further purifying the product by distillation, fractionation, etc.; 3. Obtain purified dimethyl acetal.

9. The method for preparing a quick-drying alcohol-free fountain solution according to claim 8, characterized in that: The following steps are involved:

1. Prepare all raw materials according to the recipe; 2. Add defoaming agent, alkaline buffer, cleaning dispersant, protective agent, surfactant, magnesium sulfate, glucose, glycerol, PGME and deionized water into the reactor according to the formula ratio, and gradually heat to 50-60°C under stirring to help the components to be fully dissolved and mixed; 3. After the mixture is cooled to room temperature, add the bio-based fungicide and the volatilization-promoting additive and continue to stir evenly; 4. Use a weak alkaline buffer to adjust the pH value of the solution to an appropriate range (usually 8-10), and use ultrasonic dispersion to disperse evenly; 5. Filter the mixture through a filter to remove any undissolved solid particles; 6. Put the filtered liquid into a sealed container to obtain the quick-drying alcohol-free fountain solution.

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