Recently, in the ink and packaging printing industry, the rising temperature of water-based printing inks that have risen in the ink and packaging printing industry has caused failures of this kind or in front of people to cope. Some companies require us to assist in processing, but due to the author's work The journey is very tight, so only use the corner of your magazine to make a letter to them. If not, he can propose different solutions. As the old saying goes, "Test jade must be burned for three days, and the identification of the material will take seven years."
1. Director Zhu Shangda of Jiande City, Zhejiang Province asked:
Liu Gong, what is the problem with ink thickening in the printing process?
A: In the process of packaging and printing, the ink is thickened almost even during the manufacturing process or during storage, but it is not degraded. The former is due to the temperature of the ink produced by the printing machine, but also the natural environment. Since the ammonia in the ink-and-water system evaporates after the carbon dioxide is volatilized, the amount of heat it generates is consumed (but the consumption is somewhat different). At this time, the surface viscosity of the ink rises, resulting in a decrease in the pH and a thickening. Due to the large surface pressure of the ink, the volume of the pigment and filler swells and thickens after a period of storage.
In addition to the above-mentioned several phenomena, once the ink is packaged and printed, the formation of the ink film will be greatly slowed, which will lead to the occurrence of printing failures such as printed plates, dirty plates, and filthy printing. This phenomenon is mostly reflected in ink printing products using modified rosin as a binder.
2. Chief of Pan Zhiwen, Sichuan Development Company asked:
Teacher Liu, in addition to ink and white ink, tends to thicken and excessive color is often lost network is how is it?
A: This phenomenon is similar to the problem of 1, but the difference is that most of these failures occur in printing inks that are made of acrylic resin. I have elaborated in detail the article "The Cause of the Dilution Peak of Packaging Printing Inks". In short, the acrylic monomer in the acrylic resin in the ink system did not reach 30%.
As for the loss of outlets, the printing failure is the pursuit of ink-print printing in recent years, and shallow water-based printing, due to the acidity of acrylic resin as a link material for the production of water-based ink, often due to the introduction of water-soluble crosslinker and easily lost The rewet micro-solvent causes the ink that has been filled in the printed graphics pocket to dry inside, so that it is not easily transferred to the substrate.
3. Director of Huxiuzhu, Shijiazhuang, China Banknote Printing Factory asked:
Teacher Liu, what is the problem of infiltration of penetration-proof offset printing ink?
Answer: First, the ink system is too high polymer molecular weight, viscosity is too high; Second, poor dispersion of the ink system; Third, the lack of ink penetration auxiliaries; Fourth, the substrate is too dense and so on.
4. Huang Wei, Sichuan Longmo Printing Materials Co., Ltd. asked:
Master, the ink film printing is too hard and causes impatience, how to improve?
A: One is to choose flexible materials on the printing substrates; the other is to use resins with low or soft softening point as the binder resin; third is to add plasticizers or toughening agents during the printing process; Plasticizers are introduced during the esterification process.
5. Mr. Pan Jinhan of Jiaozuo City, Henan Province asked:
Liu Gong, what is the cause of the ink film luster of ink printing?
Answer: First, the resin content in the ink-and-ink system is low, or the leveling property is poor; second, the pigment in the ink-and-ink system itself is opaque; third, the substrate is too rough; fourth, the printing pressure is too small; and fifth, the water in the ink system Or water + alcohol medium and resin solubility is not good; Sixth, the resin in the neutralization ink system itself does not reach a certain degree of transparency caused.
In terms of resin alone, the faster the agitation or amination is, the higher the molecular weight is under the same conditions. The longer the constant temperature, the better the stability. Of course, if the ink system selects the emulsion as the ink binder, the faster the dispersing and stirring speed, the higher the molecular weight (ie, the smaller the particle size), because high-speed stirring and dispersion tends to destroy the core-shell structure of the emulsion. In short, this is the main reason for the decrease in the gloss of the ink film after ink printing.
6. Director Wang Yanzhi of Zaozhuang City, Shandong Province asked:
Liu Gong, is there a water-based resin brand with low ammonia odor that can be used in both paper products and plastic (non-absorbent) substrates?
Answer: Yes. Such as domestic ML-302 resin, LX resin. Although it is not very good, it can be used universally. Because the price is only two-thirds of that of similar resins, and users only use one type of resin to produce packaging printing inks, they can be used as both surface and in India. Greatly reduce the economic risks of ink and packaging printing companies.
7. Wang Dongshan, Manager of Foshan City, Guangdong Province asked:
Liu Gong, the company has completed the first domestically-developed laser engraving machine in ceramics, the first epoxy gravure remanufacturing roller, the first high-precision roller printing machine, and the first batch of high-quality water-based ink (water-based Glaze oil) but not fully supported. I ask you: Can you assist in the completion of ceramic waterborne glaze oils and explain the colorants of ceramic waterborne printing inks?
A: First of all, I am very surprised that your company can get a lot of results in 2007. And express my sincere congratulations on the opportunity to reply! At the same time, I am very happy to promise to help your company in the ceramic printing products to find the dream of the pursuit. As for the colorants on the traditional hand-made silk screens on ceramics and the water-based inks that are now to be realized, the laser is used to engrave the intaglio plate on the epoxy foam of the sleeve and perform the printing. The colorant is the same—the metal oxide is used. In general terms, (1) red is cadmium selenium red, etc.; (2) yellow is ytterbium yellow, etc.; (3) cyan is cobalt aluminate, etc.; (4) white is titanium oxide; (5) black is trioxide. (2) Gold is metal gold; (7) Silver is metal silver or palladium; (8) Green is chromium oxide green; (9) Purple is nickel oxide, etc.
In short, ceramic packaging materials or decorative materials will be implemented on November 1st, 2007, “Standard for Color Glazing Materials for Building Sanitary Ceramics†in the “Building Materials Industry Standards of the People's Republic of Chinaâ€, namely JC/T1046·1-2007.
8. Liao Jianxiong, boss of Zhongshan City, Guangdong Province asked:
Liu Gong, in which direction will the packaging printing ink supplies go?
A: As domestic waterborne paper and waterborne plastic packaging and printing ink consumables have achieved a breakthrough this year from ink film adhesion, gloss, odor, water resistance, rub resistance, dry speed, and no shrinkage. In addition, the laws and regulations for environmental protection in the future will be more explicit, detailed, and strict, and the packaging and printing ink consumables in the future will surely move toward water-soluble or water-based packaging printing inks (including substrates such as ceramics, stone, cement, and fabrics). The direction of raw materials needed to develop.
9. Mr. Li Ye, Chief Executive Officer, Yiyang City, Hunan Province asked:
Liu Gong, how is waterborne tipping ink easy to precipitate and precipitate?
A: First, the wettability between the binder and the colorant and the filler in the ink system is poor; second, the viscosity of the binder in the ink system is low, especially the solid content of the resin is too small; third, the ambient temperature of the ink production or grinding Caused by high cycling temperature (for example, the ink does not return to room temperature for packing and capping); Fourth, precipitation and sedimentation caused by unbalanced solubility (non-transparent) of the binder during the production process or unscientific formula sequence—the binder cannot withstand the color Due to the gravity of the filler...
10. Engineer Zhang Ji of Tianlong Company, Xinxiang City, Henan Province asked:
Teacher Liu, how can I remedy the problem of frozen ink when printing with table printing ink?
A: If printing inks based on polyamide resins are used as binders, rosin-based antifreeze resins or n-propyl acetate or calcium chloride can be added; if they are printing inks with other resins as the binder, ethylene glycol can be added. Propylene glycol, glycerol solvents can be.
11, Shanghai Wang Wei asked:
Liu Gong, what is the role of wax for water-based inks?
A: One is to prevent the printing of the ink film, dirt, crystal; the second is to improve the water resistance; the third is to improve the resistance of the ink film; fourth is to prevent the ink agglomeration.
12, Liu Xiang, Xiangfan City, Hubei Province asked:
Liu Gong, what is the main purpose of LJJ resin?
A: LJJ resin has a wide range of sources and is non-toxic. Its use is for ink printing; the second is for textile printing and dyeing; the third is for paint and coating; and the fourth is for food and medicine.
On the other hand, the development and application of this resin provides a wider range of choices for our existing traditional products—platforms. It also provides an opportunity for rich people in the interior or in the mountains to become rich. Although R&D and application trials are not costly, there is still some way to go before people can recognize it and accept it. If we choose LJJ resin, environmental protection technology barrier is another matter.
13. Chen Yupu, Danjiangkou City, Hubei Province asked:
Liu Gong, why does our modified waterborne rosin resin have a deep color and a low softening point?
A: First, the color of the purchased rosin itself is deep; second, the ambient temperature of the inventory is high or the packaging is not sealed; third, although the melting temperature is not high during the modification, the melting time is too long or has been reacted after the maleic anhydride is added. Fast, especially when air oxidation causes darkness.
As for the deep color and low softening point you proposed, apart from the influence of the above points, it seems to be contrary to academic arguments. The author believes that the result of the deep color and low softening point is often: When the formula is designed, except for the reaction material, the temperature requirement of the process is low and the constant temperature time is short. As a result, the acid value is high and the softening point is high. Did not increase.
14. Zhu Yongjie, Wenzhou City, Zhejiang Province asked:
Master Liu, help me adjust PET ink formulation to have fastness of attachment?
A: You can introduce a cross-linking accelerator on your original formula, or you can use a thermoset tackifying resin that is compatible with the composite glue as an auxiliary resin. Remember that polyamide resin, alkyd resin, polyurethane resin, epoxy resin, etc. do not need to be added to the tackifier resin.
15. Don boss of Guanghan City, Sichuan Province asked:
Liu Gong, after the cement bag was filled with cement, from room temperature to 130°C, what happened after the bag ruptured at room temperature?
A: At home, most of the cement and plastic woven bag manufacturers currently producing use recycled (ie, recycled plastic waste). In particular, it has now been recycled up to twenty times. We know that PP plastics are degraded (aged) by exposure to oxygen or sunlight.
16. Wang Yong, Youyang County, Anhui Province asked:
Liu Gong, what causes the surface deposition of the ink bucket?
A: Simply put: In addition to the reasons I mentioned in 9th, the main reason is that the binder component in the ink system caused the poor wettability of the colorant and filler in the ink system. Especially when the specific surface area of ​​the pigment is large, it will accentuate the appearance of this result. Another situation is that the ink manufacturing filter does not return to room temperature or contains excessive water. Precipitation also occurs. All in all, precipitation may also be a problem that is common in pigments and binders (resins + solvents).
17. Manager Liu of Zaozhuang Mining Bureau of Shandong Province asked:
Liu Gong, polyamide resin can not be modified into water-based?
Answer: Yes. Because the polyamide resin contains hydrogen bonds, it can be modified to be water-soluble.
We know that the water solubility of the resin is affected by many factors. In general, in order to obtain the water solubility of the resin, a sufficient amount of hydrophilic groups such as -COOH, -OH, -NH2, etc. are introduced into the macromolecular chain; It is to lower the crystallinity of the polymer, for example, the water solubility of methyl cellulose, ethyl cellulose, etc. is the result of reducing its crystallinity; thirdly, the use of the counter ion of the electrolyte is also an important condition for promoting the water solubility of the resin, ie, In the sequencing process, such as the neutralization of the synthesis of water-soluble resins, the salt formation operation is the reason. Fourthly, as mentioned above, the existence of hydrogen bonds also greatly promotes the water-solubility of the resins. Many high-molecular polymers are usually It is through the interaction of hydrogen bonds and water molecules to obtain water-soluble resin; Fifth, the temperature is also an important factor affecting the water-soluble resin, such as some resins due to the increase in temperature, the heat movement and the water molecules to reduce the incidence of The degree of solubility, resulting in a decrease in solubility, forms a gel. However, most resins will increase as the temperature rises, and their resin water solubility will increase. Six, the water solubility of the resin is closely related to the structure and molecular weight of the macromolecule. In a word, polyamide is
1. Director Zhu Shangda of Jiande City, Zhejiang Province asked:
Liu Gong, what is the problem with ink thickening in the printing process?
A: In the process of packaging and printing, the ink is thickened almost even during the manufacturing process or during storage, but it is not degraded. The former is due to the temperature of the ink produced by the printing machine, but also the natural environment. Since the ammonia in the ink-and-water system evaporates after the carbon dioxide is volatilized, the amount of heat it generates is consumed (but the consumption is somewhat different). At this time, the surface viscosity of the ink rises, resulting in a decrease in the pH and a thickening. Due to the large surface pressure of the ink, the volume of the pigment and filler swells and thickens after a period of storage.
In addition to the above-mentioned several phenomena, once the ink is packaged and printed, the formation of the ink film will be greatly slowed, which will lead to the occurrence of printing failures such as printed plates, dirty plates, and filthy printing. This phenomenon is mostly reflected in ink printing products using modified rosin as a binder.
2. Chief of Pan Zhiwen, Sichuan Development Company asked:
Teacher Liu, in addition to ink and white ink, tends to thicken and excessive color is often lost network is how is it?
A: This phenomenon is similar to the problem of 1, but the difference is that most of these failures occur in printing inks that are made of acrylic resin. I have elaborated in detail the article "The Cause of the Dilution Peak of Packaging Printing Inks". In short, the acrylic monomer in the acrylic resin in the ink system did not reach 30%.
As for the loss of outlets, the printing failure is the pursuit of ink-print printing in recent years, and shallow water-based printing, due to the acidity of acrylic resin as a link material for the production of water-based ink, often due to the introduction of water-soluble crosslinker and easily lost The rewet micro-solvent causes the ink that has been filled in the printed graphics pocket to dry inside, so that it is not easily transferred to the substrate.
3. Director of Huxiuzhu, Shijiazhuang, China Banknote Printing Factory asked:
Teacher Liu, what is the problem of infiltration of penetration-proof offset printing ink?
Answer: First, the ink system is too high polymer molecular weight, viscosity is too high; Second, poor dispersion of the ink system; Third, the lack of ink penetration auxiliaries; Fourth, the substrate is too dense and so on.
4. Huang Wei, Sichuan Longmo Printing Materials Co., Ltd. asked:
Master, the ink film printing is too hard and causes impatience, how to improve?
A: One is to choose flexible materials on the printing substrates; the other is to use resins with low or soft softening point as the binder resin; third is to add plasticizers or toughening agents during the printing process; Plasticizers are introduced during the esterification process.
5. Mr. Pan Jinhan of Jiaozuo City, Henan Province asked:
Liu Gong, what is the cause of the ink film luster of ink printing?
Answer: First, the resin content in the ink-and-ink system is low, or the leveling property is poor; second, the pigment in the ink-and-ink system itself is opaque; third, the substrate is too rough; fourth, the printing pressure is too small; and fifth, the water in the ink system Or water + alcohol medium and resin solubility is not good; Sixth, the resin in the neutralization ink system itself does not reach a certain degree of transparency caused.
In terms of resin alone, the faster the agitation or amination is, the higher the molecular weight is under the same conditions. The longer the constant temperature, the better the stability. Of course, if the ink system selects the emulsion as the ink binder, the faster the dispersing and stirring speed, the higher the molecular weight (ie, the smaller the particle size), because high-speed stirring and dispersion tends to destroy the core-shell structure of the emulsion. In short, this is the main reason for the decrease in the gloss of the ink film after ink printing.
6. Director Wang Yanzhi of Zaozhuang City, Shandong Province asked:
Liu Gong, is there a water-based resin brand with low ammonia odor that can be used in both paper products and plastic (non-absorbent) substrates?
Answer: Yes. Such as domestic ML-302 resin, LX resin. Although it is not very good, it can be used universally. Because the price is only two-thirds of that of similar resins, and users only use one type of resin to produce packaging printing inks, they can be used as both surface and in India. Greatly reduce the economic risks of ink and packaging printing companies.
7. Wang Dongshan, Manager of Foshan City, Guangdong Province asked:
Liu Gong, the company has completed the first domestically-developed laser engraving machine in ceramics, the first epoxy gravure remanufacturing roller, the first high-precision roller printing machine, and the first batch of high-quality water-based ink (water-based Glaze oil) but not fully supported. I ask you: Can you assist in the completion of ceramic waterborne glaze oils and explain the colorants of ceramic waterborne printing inks?
A: First of all, I am very surprised that your company can get a lot of results in 2007. And express my sincere congratulations on the opportunity to reply! At the same time, I am very happy to promise to help your company in the ceramic printing products to find the dream of the pursuit. As for the colorants on the traditional hand-made silk screens on ceramics and the water-based inks that are now to be realized, the laser is used to engrave the intaglio plate on the epoxy foam of the sleeve and perform the printing. The colorant is the same—the metal oxide is used. In general terms, (1) red is cadmium selenium red, etc.; (2) yellow is ytterbium yellow, etc.; (3) cyan is cobalt aluminate, etc.; (4) white is titanium oxide; (5) black is trioxide. (2) Gold is metal gold; (7) Silver is metal silver or palladium; (8) Green is chromium oxide green; (9) Purple is nickel oxide, etc.
In short, ceramic packaging materials or decorative materials will be implemented on November 1st, 2007, “Standard for Color Glazing Materials for Building Sanitary Ceramics†in the “Building Materials Industry Standards of the People's Republic of Chinaâ€, namely JC/T1046·1-2007.
8. Liao Jianxiong, boss of Zhongshan City, Guangdong Province asked:
Liu Gong, in which direction will the packaging printing ink supplies go?
A: As domestic waterborne paper and waterborne plastic packaging and printing ink consumables have achieved a breakthrough this year from ink film adhesion, gloss, odor, water resistance, rub resistance, dry speed, and no shrinkage. In addition, the laws and regulations for environmental protection in the future will be more explicit, detailed, and strict, and the packaging and printing ink consumables in the future will surely move toward water-soluble or water-based packaging printing inks (including substrates such as ceramics, stone, cement, and fabrics). The direction of raw materials needed to develop.
9. Mr. Li Ye, Chief Executive Officer, Yiyang City, Hunan Province asked:
Liu Gong, how is waterborne tipping ink easy to precipitate and precipitate?
A: First, the wettability between the binder and the colorant and the filler in the ink system is poor; second, the viscosity of the binder in the ink system is low, especially the solid content of the resin is too small; third, the ambient temperature of the ink production or grinding Caused by high cycling temperature (for example, the ink does not return to room temperature for packing and capping); Fourth, precipitation and sedimentation caused by unbalanced solubility (non-transparent) of the binder during the production process or unscientific formula sequence—the binder cannot withstand the color Due to the gravity of the filler...
10. Engineer Zhang Ji of Tianlong Company, Xinxiang City, Henan Province asked:
Teacher Liu, how can I remedy the problem of frozen ink when printing with table printing ink?
A: If printing inks based on polyamide resins are used as binders, rosin-based antifreeze resins or n-propyl acetate or calcium chloride can be added; if they are printing inks with other resins as the binder, ethylene glycol can be added. Propylene glycol, glycerol solvents can be.
11, Shanghai Wang Wei asked:
Liu Gong, what is the role of wax for water-based inks?
A: One is to prevent the printing of the ink film, dirt, crystal; the second is to improve the water resistance; the third is to improve the resistance of the ink film; fourth is to prevent the ink agglomeration.
12, Liu Xiang, Xiangfan City, Hubei Province asked:
Liu Gong, what is the main purpose of LJJ resin?
A: LJJ resin has a wide range of sources and is non-toxic. Its use is for ink printing; the second is for textile printing and dyeing; the third is for paint and coating; and the fourth is for food and medicine.
On the other hand, the development and application of this resin provides a wider range of choices for our existing traditional products—platforms. It also provides an opportunity for rich people in the interior or in the mountains to become rich. Although R&D and application trials are not costly, there is still some way to go before people can recognize it and accept it. If we choose LJJ resin, environmental protection technology barrier is another matter.
13. Chen Yupu, Danjiangkou City, Hubei Province asked:
Liu Gong, why does our modified waterborne rosin resin have a deep color and a low softening point?
A: First, the color of the purchased rosin itself is deep; second, the ambient temperature of the inventory is high or the packaging is not sealed; third, although the melting temperature is not high during the modification, the melting time is too long or has been reacted after the maleic anhydride is added. Fast, especially when air oxidation causes darkness.
As for the deep color and low softening point you proposed, apart from the influence of the above points, it seems to be contrary to academic arguments. The author believes that the result of the deep color and low softening point is often: When the formula is designed, except for the reaction material, the temperature requirement of the process is low and the constant temperature time is short. As a result, the acid value is high and the softening point is high. Did not increase.
14. Zhu Yongjie, Wenzhou City, Zhejiang Province asked:
Master Liu, help me adjust PET ink formulation to have fastness of attachment?
A: You can introduce a cross-linking accelerator on your original formula, or you can use a thermoset tackifying resin that is compatible with the composite glue as an auxiliary resin. Remember that polyamide resin, alkyd resin, polyurethane resin, epoxy resin, etc. do not need to be added to the tackifier resin.
15. Don boss of Guanghan City, Sichuan Province asked:
Liu Gong, after the cement bag was filled with cement, from room temperature to 130°C, what happened after the bag ruptured at room temperature?
A: At home, most of the cement and plastic woven bag manufacturers currently producing use recycled (ie, recycled plastic waste). In particular, it has now been recycled up to twenty times. We know that PP plastics are degraded (aged) by exposure to oxygen or sunlight.
16. Wang Yong, Youyang County, Anhui Province asked:
Liu Gong, what causes the surface deposition of the ink bucket?
A: Simply put: In addition to the reasons I mentioned in 9th, the main reason is that the binder component in the ink system caused the poor wettability of the colorant and filler in the ink system. Especially when the specific surface area of ​​the pigment is large, it will accentuate the appearance of this result. Another situation is that the ink manufacturing filter does not return to room temperature or contains excessive water. Precipitation also occurs. All in all, precipitation may also be a problem that is common in pigments and binders (resins + solvents).
17. Manager Liu of Zaozhuang Mining Bureau of Shandong Province asked:
Liu Gong, polyamide resin can not be modified into water-based?
Answer: Yes. Because the polyamide resin contains hydrogen bonds, it can be modified to be water-soluble.
We know that the water solubility of the resin is affected by many factors. In general, in order to obtain the water solubility of the resin, a sufficient amount of hydrophilic groups such as -COOH, -OH, -NH2, etc. are introduced into the macromolecular chain; It is to lower the crystallinity of the polymer, for example, the water solubility of methyl cellulose, ethyl cellulose, etc. is the result of reducing its crystallinity; thirdly, the use of the counter ion of the electrolyte is also an important condition for promoting the water solubility of the resin, ie, In the sequencing process, such as the neutralization of the synthesis of water-soluble resins, the salt formation operation is the reason. Fourthly, as mentioned above, the existence of hydrogen bonds also greatly promotes the water-solubility of the resins. Many high-molecular polymers are usually It is through the interaction of hydrogen bonds and water molecules to obtain water-soluble resin; Fifth, the temperature is also an important factor affecting the water-soluble resin, such as some resins due to the increase in temperature, the heat movement and the water molecules to reduce the incidence of The degree of solubility, resulting in a decrease in solubility, forms a gel. However, most resins will increase as the temperature rises, and their resin water solubility will increase. Six, the water solubility of the resin is closely related to the structure and molecular weight of the macromolecule. In a word, polyamide is
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