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First, the historical mission of green water-based ink
In the call for environmental protection, energy conservation, pollution reduction, recycling and safe production, China's packaging-printing water-based inks ranked first in other packaging printing inks with a 35% consumption in just 20 years. Looking at a roller can be used to print a variety of different sizes of information graphics, thus eliminating the need for many different types of perimeter printing roller; ink automatically pumped into the ink, ended the ink transfer, inking device pairs Loss of ink viscosity.... The more high-end, especially water-based printing inks, the stronger the printing characteristics and the narrower the range of adaptation. In particular, the nature of its printing function lies in the promotion and guidance of a new trend in packaging and printing. It is not a best-selling ink product. If special printing inks are replaced with another packaging carrier, the ink may be of higher quality than other inks. Therefore, in today's world, many packaging and printing companies are willing to use the ink companies to design and manufacture inks for them, rather than buying batches of brand-name ink products. Many employees do not understand these reasons, blindly catch up with the trend, see there is a new ink brand on superb, that their own packaging and printing companies will be able to achieve high added value and bright and beautiful after use. The result, on the contrary, fell to the end of the game.
Ink as a green ink is only relatively speaking, (absolute green ink should be non-toxic, no pollution, can be recycled or recycled). The solubilizer ethanol, which can cause blood poisoning and kidney poisoning, has not been removed from the ink system yet. Alcohols with anesthetic but injury to the nerve center still serve as the true (strong) solvent for the ink. Of course, these should only be watched, put on gloves or wash with water. The development and application of green ink and ink is a competitive sport in the packaging ink industry in the economic globalization space. We must have a strong sense of urgency, a sense of crisis, and social responsibility. In the network of information, the temporary product quality of an individual company leads to a failure not to be deciphered by the strong scientific and technological power of others, and to overcome and squeeze the strong economic power. . What's more, nearly 1,000 companies that have a complete image of dispersal have often resorted to sporadic bravery and have been unable to work together to compete with advanced foreign companies. It is even less likely to solve the above-mentioned similar technical problems in a short period of time (in the period of protection).
Second, the role and usage of coupling agent in ink
Today, the packaging and printing industry needs a new generation of products. In the application of compounding technology and additives for printing inks, although our products, especially printing operations, are more simplified, there are still many difficulties and problems, such as poor gloss, difficult overprinting, and high costs.
In the above issues, we have boldly adopted the nationally exempted Jiangsu Yizheng Tianyang Chemical Co., Ltd.'s coupling agent, TM-200S, in combination with an electrically neutral super dispersant. It is used in ink-and-ink products and is used in printing ink systems. Different pigments, fillers and binders, through coupling, combine the excellent properties of each component with the new individual ink manufacturing process. This method has been widely used in the coating industry and has shown better than colorants and links. The more prominent advantages of the agent.
After practical screening of dozens of coupling agents, the TM-200S produced by Yizheng Tianyang Chemical Factory is one of the preferred materials for ink painting. Its characteristics are: high active calcium can be filled in the ink; improve the degree of branching of the ink system, reduce the thickness of the ink; is conducive to the affinity of pigments, fillers and printing substrates, improve the adhesion and strength of ink; can be any Proportional mixing, not only adapted to water-soluble packaging printing inks, but also to oil-soluble and solvent-based packaging printing inks; ink products with coupling agents, the storage period has been significantly extended; can also be added anywhere before and after printing or printing.
TM-200S coupling agent belongs to the chelating type. Due to its good water resistance, it can be dissolved in organic solvents and coated with pigments or fillers or used directly in solvent-based printing inks. It can also be made with alkanolamine or amine reagents. The polyactive group - after quaternization, dissolves in water to coat the pigments, fillers, or is used directly in aqueous inks.
1. Application area
(1) Normal-temperature dry water-soluble alkyd resin is used as a drying agent for the binder ink. In place of the previous metal soap driers, the mechanical properties, weather resistance, and salt spray resistance of the printing ink film can be significantly improved. Anti-yellowing. Effective UV absorbers, when printed, manually wash the printer, plate, ink roller, ink fountain and tools, can effectively protect the skin.
(2), TM-200 coupling agent can make acrylic emulsion ink thixotropic, convenient printing operation, in addition to not sag, but also improve the ink film's water resistance, abrasion resistance and washability.
(3) As the most commercially available chelating agent TM-200 coupling agent, it is not only difficult to be hydrolyzed, but also completely soluble in water, the aqueous solution is clear and stable, and in addition to improving the dispersion, the ink manufacturing cycle is shortened, but also It has a short initial rust preventive effect and is an indispensable curing agent for unsaturated polyester inks (photo-curing and two-component curing).
(4) The coupling agent is used in the printing ink system where the vinegar resin is a binder, not only can improve the dispersion of titanium dioxide in dioctyl phthalate and titanium dioxide in the aqueous phase, but also can increase the filling amount (reducing the ink Material cost) and wear resistance improve the brightness and adhesion of printed graphics.
(5) In addition, water-soluble packaging printing inks using rosin (ester) as a binder can achieve high gloss only by adding 0.3% to 1%. The actual application of the material can reduce the viscosity of the ink and improve the freeze resistance of the ink.
2. Instructions
The TM-200 type phthalate coupling agent with solvent ≥ 1:1 dilution or without dilution is evenly sprayed or directly added to the pigment or filler in high-speed stirring (without external heating) and stirred for about 10 minutes (the specific time depends on the rotation speed and dispersion (effect), and then discharge the spare or add other additives and binders, and continue to grind and disperse in the three-wheel machine, ball mill or sand mill to pass. If the above pretreatment is used for grinding and dispersion, the effect is better. We can directly add this product to the ink fountain when printing the package. The effect is slightly lower. Due to its wide range of dilution solvents, such as liquid paraffin (white oil), solvent oil, engine oil, isopropyl alcohol, ethanol, water, etc. As long as you pay attention to heat dissipation on the line, in the winter when the viscosity increases, the water bath heating (material temperature) 50 °C when the viscosity will quickly drop.
Third, the impact of ink quality and exclusion measures
1. Relationship between printing conditions and dry speed and gloss
Water-soluble flexible letterpress and gravure and screen printing screen printing inks used for printing packaging paper bags, books and magazines are low in cost and poor in gloss. In the past more than a decade, gravure carton tanks made of high-polymer acrylics have been used, but there is still a long way to go to meet the luster of users. Because of the paper density problem of carton packaging materials, coupled with the large water ink molecules, only the addition of coupling agents to increase the degree of branching is the focus of research.
In addition to the above, the temperature and humidity of the printing shop is also related to the drying and gloss of the prints. Temperature is the main condition for the promotion of oxidation polymerization and the formation of volatile ink film. Therefore, in the summer and winter, the difference between the dryness of the ink in the southern coastal area and the northern highland area is about twice as high.
The temperature of the printing shop plays a role in retarding the oxidation polymerization and volatilizing the firm ink film on the dried products of printing products. Relative humidity of 95% and 65% compared to the drying time almost two or more. At the same time, the dry humidity of paper, plastic, and fabric itself will directly affect the drying time of printed products.
Acidity will retard the oxidative polymerization of the ink and the formation of volatile solid ink film. Excessive alkalinity will lead to internal wet (dry skin chary) and affect the product's adhesion. For example, a paper with a pH of 4.5 delays the drying time of the paper by a factor of 3-5 compared to a pH of 7 paper. For the same reason, the pH value of water-based ink system often falls from pH 8 to 3.5, and the dry speed of printed products will also be 3-4 times longer.
Because oxygen or air blow is a factor that promotes the formation of oxidative polymerization and the formation of volatile solidified ink film, the degree of ventilation in the press room and the way in which prints are stacked are also related to the dry speed of the printed product. The slow speed of printing will make it difficult to overprint or cut the next process, and the phenomenon of sticky backs and faded colors will occur. On the contrary, it also makes it difficult for the second printing ink to adhere.
The inks with different specific gravities can be co-located together after adding the TM-200 coupling agent to the bridging bridge. This peculiar architecture environment is very beneficial for today's new material processing, new product manufacturing, and rapid high-performance packaging and printing.
The pH value is the key to the success or failure of ink ink manufacturing and printability technology. If the adjustment is not good, you will not get high quality prints. First of all, from the analysis of ink components, due to the combined use of alkali-soluble binders and emulsion polymers, even excessive dispersion leads to a large amount of foam, it can also promote the stability of the ink, so that the range of ink functions and printing and decorating features are expanded. . The stability of the colorant and the carrier system is based on the pH buffering and the coating of the coupling agent to achieve resistance to external acids and bases, and to maintain the stability of the aqueous ink in a certain range. Whether it is based on alkali (amine), ammonia, etc. added to the resin for acid neutralization and dissolution, or latex manufacturing technology is very different (the resin is a non-soluble continuous liquid) in water polymerization, even if the starch water insoluble matter still accounts for 26% as much. We know that it is dispersed with fine particles but it is not completely dissolved. These hundreds of thousands of small particles wander in the water without conflicting each other because the particles are charged and the co-surfaced ink inhibits their combination. This is due to the use of surfactants, protective adhesives and additives. result.
In the manufacturing or printing cycle of the ink, the volatile alkali is evaporated and often causes the pH value to drop, which causes the carrier system to become unstable, loses the ability to stably exist in the ink system, starts to solidify, and the viscosity is obviously increased. The operating staff often Misconception is caused by water shortages. I would like to use the replenishment method to make adjustments and remedy. I wonder if this dilution and low pH will further aggravate the instability of the ink system, often causing it to lose its transferability or discoloration. Even the loss of stability has occurred. The general pH value is controlled between 8.0-9.3.
Second, when the pH value of the ink in the ink fountain is too low, it can cause drying of the metal anilox roller and the plate. In the transfer process, the ink will volatilize some alkali (amine) and ammonia, and the ink ink recoils from the ink hole and the plate. In the graphic version, the printed matter is contaminated or the metal anilox roll is blocked, ie, the amount of ink is insufficient. It is often difficult to wash the printer with water after printing with a rotary diaphragm vacuum pump.
There is also a situation where the pH value of the ink fountain is too high, which is often caused by the adjustment of the operating staff. These remaining alkalis cannot be eliminated during the printing process. Even if the amount of alkali is small and the time is long, the water resistance of the ink film is difficult to reach. High value. This is because the base is physically closed after the formation of the ink film, so the ink film will never reach sufficient water resistance, adhesion and gloss.
In addition to the above-mentioned factors, the ink pH value, the printing medium pH, the ink, or the dry, glossy, paper surface, plastic surface, fabric surface (such as rosin ester, clay, etc. used in paper sizing, and each has its own characteristics). The ink painting also has an effect. When the ink is printed on the surface of the paper, it will be affected by the pH value of the Printing Paper. When the acidity of the paper is high, the coupling agent used as a driers in the ink does not work, the alkali in the ink is neutralized, and the dryness is advanced, and the paper alkali is advanced. High-quality, slow-drying inks sometimes limit the ink's ability to resist water completely.
2. Ink and ink troubleshooting reasons and troubleshooting
Inaccurate hue: the viscosity of the ink is too low or the content of the pigment in the system is small or the color purity is deviated. The ink separates and precipitates during printing, and the ink is stirred unevenly and cannot be transferred. Incorporate the original ink, adjust the viscosity, stir the ink and then print, check the printing plate and the ink roller for aging.
Viscosity instability: The ink has thixotropy, foaming, solvent volatile, the ink should be used after stirring evenly, add appropriate amount of oxime foaming agent (0.2%), add the appropriate amount of solvent to achieve the balance of volatilization speed.
Poor drying (except for the above): When the expected time, the imprinting is not dry or even sticky; the ink viscosity is high, the outline edge is not dry, the ink is not dry, the absorption of the base paper or plastic, fabric is poor, the diluted ink ,
In the call for environmental protection, energy conservation, pollution reduction, recycling and safe production, China's packaging-printing water-based inks ranked first in other packaging printing inks with a 35% consumption in just 20 years. Looking at a roller can be used to print a variety of different sizes of information graphics, thus eliminating the need for many different types of perimeter printing roller; ink automatically pumped into the ink, ended the ink transfer, inking device pairs Loss of ink viscosity.... The more high-end, especially water-based printing inks, the stronger the printing characteristics and the narrower the range of adaptation. In particular, the nature of its printing function lies in the promotion and guidance of a new trend in packaging and printing. It is not a best-selling ink product. If special printing inks are replaced with another packaging carrier, the ink may be of higher quality than other inks. Therefore, in today's world, many packaging and printing companies are willing to use the ink companies to design and manufacture inks for them, rather than buying batches of brand-name ink products. Many employees do not understand these reasons, blindly catch up with the trend, see there is a new ink brand on superb, that their own packaging and printing companies will be able to achieve high added value and bright and beautiful after use. The result, on the contrary, fell to the end of the game.
Ink as a green ink is only relatively speaking, (absolute green ink should be non-toxic, no pollution, can be recycled or recycled). The solubilizer ethanol, which can cause blood poisoning and kidney poisoning, has not been removed from the ink system yet. Alcohols with anesthetic but injury to the nerve center still serve as the true (strong) solvent for the ink. Of course, these should only be watched, put on gloves or wash with water. The development and application of green ink and ink is a competitive sport in the packaging ink industry in the economic globalization space. We must have a strong sense of urgency, a sense of crisis, and social responsibility. In the network of information, the temporary product quality of an individual company leads to a failure not to be deciphered by the strong scientific and technological power of others, and to overcome and squeeze the strong economic power. . What's more, nearly 1,000 companies that have a complete image of dispersal have often resorted to sporadic bravery and have been unable to work together to compete with advanced foreign companies. It is even less likely to solve the above-mentioned similar technical problems in a short period of time (in the period of protection).
Second, the role and usage of coupling agent in ink
Today, the packaging and printing industry needs a new generation of products. In the application of compounding technology and additives for printing inks, although our products, especially printing operations, are more simplified, there are still many difficulties and problems, such as poor gloss, difficult overprinting, and high costs.
In the above issues, we have boldly adopted the nationally exempted Jiangsu Yizheng Tianyang Chemical Co., Ltd.'s coupling agent, TM-200S, in combination with an electrically neutral super dispersant. It is used in ink-and-ink products and is used in printing ink systems. Different pigments, fillers and binders, through coupling, combine the excellent properties of each component with the new individual ink manufacturing process. This method has been widely used in the coating industry and has shown better than colorants and links. The more prominent advantages of the agent.
After practical screening of dozens of coupling agents, the TM-200S produced by Yizheng Tianyang Chemical Factory is one of the preferred materials for ink painting. Its characteristics are: high active calcium can be filled in the ink; improve the degree of branching of the ink system, reduce the thickness of the ink; is conducive to the affinity of pigments, fillers and printing substrates, improve the adhesion and strength of ink; can be any Proportional mixing, not only adapted to water-soluble packaging printing inks, but also to oil-soluble and solvent-based packaging printing inks; ink products with coupling agents, the storage period has been significantly extended; can also be added anywhere before and after printing or printing.
TM-200S coupling agent belongs to the chelating type. Due to its good water resistance, it can be dissolved in organic solvents and coated with pigments or fillers or used directly in solvent-based printing inks. It can also be made with alkanolamine or amine reagents. The polyactive group - after quaternization, dissolves in water to coat the pigments, fillers, or is used directly in aqueous inks.
1. Application area
(1) Normal-temperature dry water-soluble alkyd resin is used as a drying agent for the binder ink. In place of the previous metal soap driers, the mechanical properties, weather resistance, and salt spray resistance of the printing ink film can be significantly improved. Anti-yellowing. Effective UV absorbers, when printed, manually wash the printer, plate, ink roller, ink fountain and tools, can effectively protect the skin.
(2), TM-200 coupling agent can make acrylic emulsion ink thixotropic, convenient printing operation, in addition to not sag, but also improve the ink film's water resistance, abrasion resistance and washability.
(3) As the most commercially available chelating agent TM-200 coupling agent, it is not only difficult to be hydrolyzed, but also completely soluble in water, the aqueous solution is clear and stable, and in addition to improving the dispersion, the ink manufacturing cycle is shortened, but also It has a short initial rust preventive effect and is an indispensable curing agent for unsaturated polyester inks (photo-curing and two-component curing).
(4) The coupling agent is used in the printing ink system where the vinegar resin is a binder, not only can improve the dispersion of titanium dioxide in dioctyl phthalate and titanium dioxide in the aqueous phase, but also can increase the filling amount (reducing the ink Material cost) and wear resistance improve the brightness and adhesion of printed graphics.
(5) In addition, water-soluble packaging printing inks using rosin (ester) as a binder can achieve high gloss only by adding 0.3% to 1%. The actual application of the material can reduce the viscosity of the ink and improve the freeze resistance of the ink.
2. Instructions
The TM-200 type phthalate coupling agent with solvent ≥ 1:1 dilution or without dilution is evenly sprayed or directly added to the pigment or filler in high-speed stirring (without external heating) and stirred for about 10 minutes (the specific time depends on the rotation speed and dispersion (effect), and then discharge the spare or add other additives and binders, and continue to grind and disperse in the three-wheel machine, ball mill or sand mill to pass. If the above pretreatment is used for grinding and dispersion, the effect is better. We can directly add this product to the ink fountain when printing the package. The effect is slightly lower. Due to its wide range of dilution solvents, such as liquid paraffin (white oil), solvent oil, engine oil, isopropyl alcohol, ethanol, water, etc. As long as you pay attention to heat dissipation on the line, in the winter when the viscosity increases, the water bath heating (material temperature) 50 °C when the viscosity will quickly drop.
Third, the impact of ink quality and exclusion measures
1. Relationship between printing conditions and dry speed and gloss
Water-soluble flexible letterpress and gravure and screen printing screen printing inks used for printing packaging paper bags, books and magazines are low in cost and poor in gloss. In the past more than a decade, gravure carton tanks made of high-polymer acrylics have been used, but there is still a long way to go to meet the luster of users. Because of the paper density problem of carton packaging materials, coupled with the large water ink molecules, only the addition of coupling agents to increase the degree of branching is the focus of research.
In addition to the above, the temperature and humidity of the printing shop is also related to the drying and gloss of the prints. Temperature is the main condition for the promotion of oxidation polymerization and the formation of volatile ink film. Therefore, in the summer and winter, the difference between the dryness of the ink in the southern coastal area and the northern highland area is about twice as high.
The temperature of the printing shop plays a role in retarding the oxidation polymerization and volatilizing the firm ink film on the dried products of printing products. Relative humidity of 95% and 65% compared to the drying time almost two or more. At the same time, the dry humidity of paper, plastic, and fabric itself will directly affect the drying time of printed products.
Acidity will retard the oxidative polymerization of the ink and the formation of volatile solid ink film. Excessive alkalinity will lead to internal wet (dry skin chary) and affect the product's adhesion. For example, a paper with a pH of 4.5 delays the drying time of the paper by a factor of 3-5 compared to a pH of 7 paper. For the same reason, the pH value of water-based ink system often falls from pH 8 to 3.5, and the dry speed of printed products will also be 3-4 times longer.
Because oxygen or air blow is a factor that promotes the formation of oxidative polymerization and the formation of volatile solidified ink film, the degree of ventilation in the press room and the way in which prints are stacked are also related to the dry speed of the printed product. The slow speed of printing will make it difficult to overprint or cut the next process, and the phenomenon of sticky backs and faded colors will occur. On the contrary, it also makes it difficult for the second printing ink to adhere.
The inks with different specific gravities can be co-located together after adding the TM-200 coupling agent to the bridging bridge. This peculiar architecture environment is very beneficial for today's new material processing, new product manufacturing, and rapid high-performance packaging and printing.
The pH value is the key to the success or failure of ink ink manufacturing and printability technology. If the adjustment is not good, you will not get high quality prints. First of all, from the analysis of ink components, due to the combined use of alkali-soluble binders and emulsion polymers, even excessive dispersion leads to a large amount of foam, it can also promote the stability of the ink, so that the range of ink functions and printing and decorating features are expanded. . The stability of the colorant and the carrier system is based on the pH buffering and the coating of the coupling agent to achieve resistance to external acids and bases, and to maintain the stability of the aqueous ink in a certain range. Whether it is based on alkali (amine), ammonia, etc. added to the resin for acid neutralization and dissolution, or latex manufacturing technology is very different (the resin is a non-soluble continuous liquid) in water polymerization, even if the starch water insoluble matter still accounts for 26% as much. We know that it is dispersed with fine particles but it is not completely dissolved. These hundreds of thousands of small particles wander in the water without conflicting each other because the particles are charged and the co-surfaced ink inhibits their combination. This is due to the use of surfactants, protective adhesives and additives. result.
In the manufacturing or printing cycle of the ink, the volatile alkali is evaporated and often causes the pH value to drop, which causes the carrier system to become unstable, loses the ability to stably exist in the ink system, starts to solidify, and the viscosity is obviously increased. The operating staff often Misconception is caused by water shortages. I would like to use the replenishment method to make adjustments and remedy. I wonder if this dilution and low pH will further aggravate the instability of the ink system, often causing it to lose its transferability or discoloration. Even the loss of stability has occurred. The general pH value is controlled between 8.0-9.3.
Second, when the pH value of the ink in the ink fountain is too low, it can cause drying of the metal anilox roller and the plate. In the transfer process, the ink will volatilize some alkali (amine) and ammonia, and the ink ink recoils from the ink hole and the plate. In the graphic version, the printed matter is contaminated or the metal anilox roll is blocked, ie, the amount of ink is insufficient. It is often difficult to wash the printer with water after printing with a rotary diaphragm vacuum pump.
There is also a situation where the pH value of the ink fountain is too high, which is often caused by the adjustment of the operating staff. These remaining alkalis cannot be eliminated during the printing process. Even if the amount of alkali is small and the time is long, the water resistance of the ink film is difficult to reach. High value. This is because the base is physically closed after the formation of the ink film, so the ink film will never reach sufficient water resistance, adhesion and gloss.
In addition to the above-mentioned factors, the ink pH value, the printing medium pH, the ink, or the dry, glossy, paper surface, plastic surface, fabric surface (such as rosin ester, clay, etc. used in paper sizing, and each has its own characteristics). The ink painting also has an effect. When the ink is printed on the surface of the paper, it will be affected by the pH value of the Printing Paper. When the acidity of the paper is high, the coupling agent used as a driers in the ink does not work, the alkali in the ink is neutralized, and the dryness is advanced, and the paper alkali is advanced. High-quality, slow-drying inks sometimes limit the ink's ability to resist water completely.
2. Ink and ink troubleshooting reasons and troubleshooting
Inaccurate hue: the viscosity of the ink is too low or the content of the pigment in the system is small or the color purity is deviated. The ink separates and precipitates during printing, and the ink is stirred unevenly and cannot be transferred. Incorporate the original ink, adjust the viscosity, stir the ink and then print, check the printing plate and the ink roller for aging.
Viscosity instability: The ink has thixotropy, foaming, solvent volatile, the ink should be used after stirring evenly, add appropriate amount of oxime foaming agent (0.2%), add the appropriate amount of solvent to achieve the balance of volatilization speed.
Poor drying (except for the above): When the expected time, the imprinting is not dry or even sticky; the ink viscosity is high, the outline edge is not dry, the ink is not dry, the absorption of the base paper or plastic, fabric is poor, the diluted ink ,
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