CN114806263A - Gravure boiling-resistant waterborne polyurethane ink and preparation method thereof - Google Patents
Gravure boiling-resistant waterborne polyurethane ink and preparation method thereof Download PDFInfo
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- CN114806263A CN114806263A CN202210510601.1A CN202210510601A CN114806263A CN 114806263 A CN114806263 A CN 114806263A CN 202210510601 A CN202210510601 A CN 202210510601A CN 114806263 A CN114806263 A CN 114806263A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
- C09D11/037—Printing inks characterised by features other than the chemical nature of the binder characterised by the pigment
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/102—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
Abstract
The invention relates to the technical field of ink, in particular to gravure boiling-resistant waterborne polyurethane ink and a preparation method thereof. The components comprise 50-60 parts of waterborne polyurethane resin, 20-30 parts of modified carbon black, 1-3 parts of sodium polyacrylate dispersant, 1-3 parts of waterborne organic silicon defoamer, 0.5-1 part of alkyl sodium sulfonate antistatic agent and 40-50 parts of water. The ink of the invention grafts the sodium alginate on the surface of the carbon black pigment, thereby loading-COO on the surface of the carbon black ‑ Under the action of electrostatic repulsion force, carbon black and carbon black particles are mutually repelled, so that the agglomeration and sedimentation of the carbon black are prevented, polyurethane binding materials between the printing ink and the flexible package contact surface are increased, the binding strength of the printing ink and the flexible package is improved, the printing ink is still bound on the package surface after being steamed and boiled at high temperature, and the phenomenon of fading is avoided.
Description
Technical Field
The invention relates to the technical field of ink, in particular to gravure boiling-resistant waterborne polyurethane ink and a preparation method thereof.
Background
The flexible packaging technology in China is developed rapidly, the level is improved continuously, the manufactured flexible packaging materials are various in styles, and the composite flexible packaging material is one of the more mature main packaging materials in China. If the used film base materials comprise PET, BOPP, VMPET, VMCPP, PE, CPP, AL and the like, the trend of flexible packaging is developing towards high barrier property and high-temperature boiling resistance, and particularly, the external flexible packaging materials of foods, medicines and the like are required to have high performance such as high-temperature disinfection, environmental protection, sanitation and the like, so that the ink which meets the high-temperature boiling resistance condition and is suitable for high-temperature boiling is required to be matched with the external flexible packaging materials.
For a long time, gravure occupies a half-wall Jiangshan in the field of food flexible packaging due to the unique advantages of high printing speed, high production efficiency, good quality of printed products and the like. Intaglio printing is called gravure for short, and is one of four printing modes. Intaglio printing is a direct printing method, which directly imprints the ink contained in the intaglio pits on a printing stock, wherein the shade level of the printed picture is determined by the size and the depth of the pits, if the pits are deeper, the contained ink is more, and the ink layer left on the printed matter after imprinting is thicker; conversely, if the depressions are shallow, less ink is contained and a thin film layer remains on the substrate after imprinting. The gravure printing occupies an important position in the fields of printing packaging and graphic publishing by the advantages of bright color, high saturation, high printing durability, stable quality of printed products, high printing speed and the like. However, gravure printing also has certain defects, and the solvent used in the ink adopted in the gravure printing technology is an organic solvent, so that the pollution to the human environment is caused. Therefore, researchers develop water-based gravure printing ink in solvent-based gravure printing ink, but the gravure water-based ink is generally poor in steaming resistance, and the ink is easy to fall off from the surface of a flexible package after the flexible package is heated, so that the printed characters and patterns on the flexible package are blurred.
For example, chinese patent publication No. CN110016251 discloses an aqueous gravure ink comprising a carboxylic acid type aqueous polyurethane emulsion, an aqueous dispersant, a substrate wetting agent, a pigment, cellulose acetate butyrate, ethanol, an antifoaming agent, and water. The ink in the technical scheme of the patent is easy to separate from the surface of the plastic flexible package in a high-temperature cooking environment.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a steaming-resistant waterborne polyurethane ink for gravure printing.
The invention also provides a preparation method of the gravure steaming-resistant waterborne polyurethane ink.
In order to achieve the purpose, the invention adopts the following technical scheme: the steaming-resistant waterborne polyurethane ink for gravure printing comprises the following components in parts by weight:
50-60 parts of waterborne polyurethane resin, 20-30 parts of modified carbon black, 1-3 parts of sodium polyacrylate dispersant, 1-3 parts of waterborne organic silicon defoamer, 0.5-1 part of alkyl sodium sulfonate antistatic agent and 40-50 parts of water.
The water-based polyurethane ink takes the water-based polyurethane as the binder of the ink, the solvent is water, the traditional organic solvent is replaced, the solvent volatilization is avoided, the environment is protected, and particularly, the ink is concavely printed on the surface of a flexible package, so that the harm to the health of human bodies is avoided. The ink obtained by using the modified carbon black as the pigment of the ink, the sodium polyacrylate as the dispersing agent, the water-based organic silicon as the defoaming agent and the sodium alkyl sulfonate as the antistatic agent has good anti-peeling strength and antistatic performance.
Preferably, the preparation method of the modified carbon black comprises the following steps:
1) adding carbon black into a nitric acid aqueous solution, stirring for oxidation reaction, filtering, separating, washing with water, and drying in an oven to obtain oxidized modified carbon black;
2) adding an epoxy silane coupling agent into a mixed solution of ethanol and water, heating and stirring to obtain a silane coupling agent hydrolysate, adding the oxidized modified carbon black into the silane coupling agent hydrolysate, heating and stirring to obtain coupling agent modified carbon black;
3) adding sodium alginate into deionized water, stirring and dissolving to prepare a sodium alginate solution, adding a sodium hydroxide catalyst, heating to 100 ℃ and 110 ℃, then adding a coupling agent modified carbon black, and carrying out heat preservation reaction to obtain the modified carbon black.
In the prior art, carbon black is generally used as a pigment of water-based ink, the ink can meet the printing requirement in general intaglio printing, but in the field of flexible packages needing heating, such as soybean milk bags and boxed rice packages, the water-based polyurethane ink is very easy to fall off from the surface of the flexible package after food is heated in the heating process, so that printed fonts and patterns are blurred, the carbon black is related to the polyurethane high molecular structure of the carbon black, and the carbon black is a hydrophobic substanceThe dispersion in the waterborne polyurethane is uneven, agglomeration and deposition are easy to occur, sedimentation occurs, and a large amount of carbon black is gathered on the bottom layer of the printing ink, so that the polyurethane binder at the bottom layer is reduced, the bonding strength of the printing ink and a flexible package is reduced, the printing ink is separated from the surface of the flexible package in the high-temperature cooking process, and the phenomenon of color fading occurs. The traditional general solution is to add a dispersant into the ink to improve the dispersion performance of the ink, but the improvement of the dispersion performance of the carbon black in the ink by only adding the dispersant in the gravure printing is limited. On one hand, a sodium polyacrylate dispersant is added into the water-based polyurethane ink to assist in improving the dispersion performance of the carbon black, on the other hand, the carbon black is modified, nitric acid is used for oxidizing the carbon black, hydrophilic active groups such as hydrophilic hydroxyl, carboxyl and the like are loaded on the surface of the carbon black, then the silicon-oxygen bond of the epoxy silane coupling agent and the hydroxyl on the surface of the carbon black are subjected to dehydration condensation reaction, so that the epoxy silane coupling agent is grafted to the surface of the carbon black, the surface of the carbon black is loaded with epoxy groups, and then the epoxy groups and the hydroxyl on the sodium alginate are subjected to ring opening reaction, so that the sodium alginate is grafted to the surface of the pigment carbon black, and the surface of the carbon black is loaded with-COO - Under the action of electrostatic repulsion force, carbon black and carbon black particles are mutually repelled, so that the carbon black is prevented from agglomerating and settling, the carbon black is uniformly dispersed, polyurethane bonding materials between the printing ink and the flexible package contact surface are increased, the bonding strength of the printing ink and the flexible package is improved, the printing ink is still bonded on the package surface after being steamed and boiled at high temperature, and the phenomenon of fading is avoided.
Preferably, the oxidation reaction time in the step 1) is controlled to be 7-8.5 h.
Intensive research conducted by the present invention group has found that the glossiness and boiling resistance of the ink are closely related to the oxidation time of nitric acid on carbon black, because the oxidation time of nitric acid on carbon black is related to the amount of hydroxyl functional groups on the surface of carbon black, and the longer the oxidation time is, the more hydroxyl groups on the surface of carbon black are, the more sodium alginate is grafted on the surface, the stronger the negative charge on the surface of carbon black is, the more uniform the carbon black is dispersed in the ink, and the better the boiling resistance is. However, too long oxidation time can cause too many hydroxyl groups to be loaded on the surface of the carbon black, so that excessive sodium alginate is grafted on the surface of the carbon black, and too much sodium alginate grafted on the surface of the carbon black can reduce the gloss of the ink and cause adverse effects on the performance of the ink. If the oxidation time is too short, the amount of loaded sodium alginate on the surface of the carbon black is too small, the electric repulsion is weak, and the dispersion of the carbon black in the ink is influenced. Therefore, the control of the nitric acid is vital to the oxidation time of the carbon black, and the control of the oxidation time in a reasonable range can simultaneously ensure that the ink has good boiling resistance and good glossiness.
Preferably, the mass ratio of the oxidation modified carbon black to the epoxy silane coupling agent in the step 2) is 1: 0.1-0.3.
Preferably, the mass concentration of the sodium alginate solution in the step 3) is 1-5%.
Preferably, the adding amount of the sodium hydroxide catalyst in the step 3) is 2-3% of the mass of the sodium alginate solution.
Preferably, the reaction time in the step 3) is 2-5 h.
A preparation method of gravure steaming-resistant waterborne polyurethane ink comprises the following steps:
adding the waterborne polyurethane resin, the waterborne organic silicon defoamer, the sodium alkyl sulfonate antistatic agent and water into a stirring kettle, stirring for 40-60min at the speed of 300-400r/min, then adding the sodium polyacrylate dispersant and the modified carbon black, and stirring for 30-40min at the speed of 700-800 r/min.
Therefore, the invention has the following beneficial effects:
sodium alginate is grafted to the surface of the pigment carbon black, so that the surface of the carbon black is loaded with-COO - Under the action of electrostatic repulsion force, carbon black and carbon black particles are mutually repelled, so that the carbon black is prevented from agglomerating and settling, the carbon black is uniformly dispersed, polyurethane bonding materials between the printing ink and the flexible package contact surface are increased, the bonding strength of the printing ink and the flexible package is improved, the printing ink is still bonded on the package surface after being steamed and boiled at high temperature, and the phenomenon of fading is avoided.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples. In the present invention, unless otherwise specified, raw materials, equipment, and the like used are commercially available or commonly used in the art, and the methods in the examples are conventional in the art unless otherwise specified. The aqueous polyurethane resin used in the invention is produced by Wenzhou national Shibang Polymer materials GmbH, model GSB-32.
Example 1
The preparation method of the modified carbon black comprises the following steps:
1) adding carbon black into a nitric acid aqueous solution with the mass concentration of 25%, stirring for carrying out oxidation reaction for 7 hours, filtering, separating, washing with water, and drying in a drying oven at 50 ℃ for 3 hours to obtain oxidized modified carbon black;
2) adding an epoxy silane coupling agent KH560 into a mixed solution of ethanol and water, wherein the volume ratio of ethanol to water is 5:1, the addition amount of the epoxy silane coupling agent is 2 wt% of the mixed solution, heating to 40 ℃, stirring for 2h to obtain silane coupling agent hydrolysate, adding oxidized modified carbon black into the silane coupling agent hydrolysate, wherein the mass ratio of the oxidized modified carbon black to the epoxy silane coupling agent is 1:0.1, heating to 50 ℃, and stirring for 3h to obtain coupling agent modified carbon black;
3) adding sodium alginate into deionized water, stirring and dissolving to prepare a sodium alginate solution with the mass concentration of 1%, adding a sodium hydroxide catalyst, wherein the addition amount of the sodium hydroxide catalyst is 2% of the mass of the sodium alginate solution, heating to 100 ℃, then adding coupling agent modified carbon black, wherein the mass ratio of the coupling agent modified carbon black to the sodium alginate is 1:0.5, and carrying out heat preservation reaction for 2 hours to obtain the modified carbon black.
The gravure steaming-resistant waterborne polyurethane ink comprises the following components in parts by weight:
50 parts of waterborne polyurethane resin, 20 parts of modified carbon black, 1 part of sodium polyacrylate dispersant, 1 part of waterborne organic silicon defoamer, 0.5 part of alkyl sodium sulfonate antistatic agent and 40 parts of water.
The preparation method of the gravure steaming-resistant waterborne polyurethane ink comprises the following steps:
adding the waterborne polyurethane resin, the waterborne organic silicon defoamer, the sodium alkyl sulfonate antistatic agent and water into a stirring kettle, stirring for 60min at the speed of 300r/min, then adding the sodium polyacrylate dispersant and the modified carbon black, and stirring for 40min at the speed of 700r/min to obtain the water-based polyurethane resin.
Example 2
The preparation method of the modified carbon black comprises the following steps:
1) adding carbon black into a nitric acid aqueous solution with the mass concentration of 25%, stirring for carrying out oxidation reaction for 8.5h, filtering, separating, washing with water, and drying in a drying oven at 50 ℃ for 3h to obtain oxidized modified carbon black;
2) adding an epoxy silane coupling agent KH560 into a mixed solution of ethanol and water, wherein the volume ratio of ethanol to water is 5:1, the addition amount of the epoxy silane coupling agent is 2 wt% of the mixed solution, heating to 40 ℃, stirring for 2h to obtain silane coupling agent hydrolysate, adding oxidized modified carbon black into the silane coupling agent hydrolysate, wherein the mass ratio of the oxidized modified carbon black to the epoxy silane coupling agent is 1:0.3, heating to 50 ℃, and stirring for 3h to obtain coupling agent modified carbon black;
3) adding sodium alginate into deionized water, stirring and dissolving to prepare a sodium alginate solution with the mass concentration of 5%, adding a sodium hydroxide catalyst, heating to 110 ℃, adding coupling agent modified carbon black, wherein the mass ratio of the coupling agent modified carbon black to the sodium alginate is 1:0.5, and carrying out heat preservation reaction for 5 hours to obtain the modified carbon black.
The gravure steaming-resistant waterborne polyurethane ink comprises the following components in parts by weight:
60 parts of waterborne polyurethane resin, 30 parts of modified carbon black, 3 parts of sodium polyacrylate dispersant, 3 parts of waterborne organic silicon defoamer, 1 part of alkyl sodium sulfonate antistatic agent and 50 parts of water.
The preparation method of the gravure steaming-resistant waterborne polyurethane ink comprises the following steps:
adding the waterborne polyurethane resin, the waterborne organic silicon defoamer, the sodium alkyl sulfonate antistatic agent and water into a stirring kettle, stirring for 40min at the speed of 400r/min, then adding the sodium polyacrylate dispersant and the modified carbon black, and stirring for 30min at the speed of 800r/min to obtain the water-based polyurethane resin.
Example 3
The preparation method of the modified carbon black comprises the following steps:
1) adding carbon black into a nitric acid aqueous solution with the mass concentration of 25%, stirring for carrying out oxidation reaction for 7.5h, filtering, separating, washing with water, and drying in a drying oven at 50 ℃ for 3h to obtain oxidized modified carbon black;
2) adding an epoxy silane coupling agent KH560 into a mixed solution of ethanol and water, wherein the volume ratio of ethanol to water is 5:1, the addition amount of the epoxy silane coupling agent is 2 wt% of the mixed solution, heating to 40 ℃, stirring for 2h to obtain silane coupling agent hydrolysate, adding oxidized modified carbon black into the silane coupling agent hydrolysate, wherein the mass ratio of the oxidized modified carbon black to the epoxy silane coupling agent is 1:0.15, heating to 50 ℃, and stirring for 3h to obtain coupling agent modified carbon black;
3) adding sodium alginate into deionized water, stirring and dissolving to prepare a sodium alginate solution with the mass concentration of 2%, adding a sodium hydroxide catalyst, heating to 105 ℃, adding coupling agent modified carbon black, wherein the mass ratio of the coupling agent modified carbon black to the sodium alginate is 1:0.5, and reacting for 3 hours under the condition of heat preservation to obtain the modified carbon black, wherein the addition amount of the sodium hydroxide catalyst is 2.5% of the mass of the sodium alginate solution.
The gravure steaming-resistant waterborne polyurethane ink comprises the following components in parts by weight:
52 parts of waterborne polyurethane resin, 23 parts of modified carbon black, 2 parts of sodium polyacrylate dispersant, 2 parts of waterborne organic silicon defoamer, 0.8 part of alkyl sodium sulfonate antistatic agent and 43 parts of water.
The preparation method of the gravure steaming-resistant waterborne polyurethane ink comprises the following steps:
adding the waterborne polyurethane resin, the waterborne organic silicon defoamer, the sodium alkyl sulfonate antistatic agent and water into a stirring kettle, stirring for 50min at the speed of 350r/min, then adding the sodium polyacrylate dispersant and the modified carbon black, and stirring for 35min at the speed of 750r/min to obtain the polyurethane foam material.
Example 4
The preparation method of the modified carbon black comprises the following steps:
1) adding carbon black into a nitric acid aqueous solution with the mass concentration of 25%, stirring for carrying out oxidation reaction for 8 hours, filtering, separating, washing with water, and drying in a drying oven at 50 ℃ for 3 hours to obtain oxidized modified carbon black;
2) adding an epoxy silane coupling agent KH560 into a mixed solution of ethanol and water, wherein the volume ratio of ethanol to water is 5:1, the addition amount of the epoxy silane coupling agent is 2 wt% of the mixed solution, heating to 40 ℃, stirring for 2h to obtain silane coupling agent hydrolysate, adding oxidized modified carbon black into the silane coupling agent hydrolysate, wherein the mass ratio of the oxidized modified carbon black to the epoxy silane coupling agent is 1:0.25, heating to 50 ℃, and stirring for 3h to obtain coupling agent modified carbon black;
3) adding sodium alginate into deionized water, stirring and dissolving to prepare a sodium alginate solution with the mass concentration of 4%, adding a sodium hydroxide catalyst, wherein the addition amount of the sodium hydroxide catalyst is 2.5% of the mass of the sodium alginate solution, heating to 105 ℃, then adding coupling agent modified carbon black, wherein the mass ratio of the coupling agent modified carbon black to the sodium alginate is 1:0.5, and carrying out heat preservation reaction for 4 hours to obtain the modified carbon black.
The gravure steaming-resistant waterborne polyurethane ink comprises the following components in parts by weight:
58 parts of waterborne polyurethane resin, 27 parts of modified carbon black, 2 parts of sodium polyacrylate dispersant, 2 parts of waterborne organic silicon defoamer, 0.8 part of alkyl sodium sulfonate antistatic agent and 47 parts of water.
The preparation method of the gravure boiling-resistant waterborne polyurethane ink comprises the following steps:
adding the waterborne polyurethane resin, the waterborne organic silicon defoamer, the sodium alkyl sulfonate antistatic agent and water into a stirring kettle, stirring for 50min at the speed of 350r/min, then adding the sodium polyacrylate dispersant and the modified carbon black, and stirring for 35min at the speed of 750r/min to obtain the polyurethane foam material.
Example 5
The preparation method of the modified carbon black comprises the following steps:
1) adding carbon black into a nitric acid aqueous solution with the mass concentration of 25%, stirring for carrying out oxidation reaction for 8 hours, filtering, separating, washing with water, and drying in a drying oven at 50 ℃ for 3 hours to obtain oxidized modified carbon black;
2) adding an epoxy silane coupling agent KH560 into a mixed solution of ethanol and water, wherein the volume ratio of ethanol to water is 5:1, the addition amount of the epoxy silane coupling agent is 2 wt% of the mixed solution, heating to 40 ℃, stirring for 2h to obtain silane coupling agent hydrolysate, adding oxidized modified carbon black into the silane coupling agent hydrolysate, wherein the mass ratio of the oxidized modified carbon black to the epoxy silane coupling agent is 1:0.2, heating to 50 ℃, and stirring for 3h to obtain coupling agent modified carbon black;
3) adding sodium alginate into deionized water, stirring and dissolving to prepare a sodium alginate solution with the mass concentration of 3%, adding a sodium hydroxide catalyst, wherein the addition amount of the sodium hydroxide catalyst is 2.5% of the mass of the sodium alginate solution, heating to 105 ℃, then adding coupling agent modified carbon black, wherein the mass ratio of the coupling agent modified carbon black to the sodium alginate is 1:0.5, and carrying out heat preservation reaction for 3 hours to obtain the modified carbon black.
The gravure steaming-resistant waterborne polyurethane ink comprises the following components in parts by weight:
55 parts of waterborne polyurethane resin, 25 parts of modified carbon black, 2 parts of sodium polyacrylate dispersant, 2 parts of waterborne organic silicon defoamer, 0.8 part of alkyl sodium sulfonate antistatic agent and 45 parts of water.
The preparation method of the gravure steaming-resistant waterborne polyurethane ink comprises the following steps:
adding the waterborne polyurethane resin, the waterborne organic silicon defoamer, the sodium alkyl sulfonate antistatic agent and water into a stirring kettle, stirring for 45min at the speed of 350r/min, then adding the sodium polyacrylate dispersant and the modified carbon black, and stirring for 35min at the speed of 750r/min to obtain the polyurethane foam material.
Comparative example 1:
comparative example 1 is different from example 1 in that carbon black is not subjected to modification treatment.
Comparative example 2
Comparative example 2 is different from example 1 in that the time for oxidation of carbon black by nitric acid in the production process of modified carbon black was adjusted to 6 hours.
Comparative example 3
Comparative example 3 is different from example 1 in that the nitric acid oxidation time of the carbon black during the production of the modified carbon black was adjusted to 9 hours.
And (3) performance testing:
1 examples 1-4 and comparative examples 1-3 aqueous polyurethane inks were printed on PET film and tested for 90 peel in the machine direction, the results of which are given in the table below.
2 resistance to boiling
Printing the prepared ink on a PET film, then putting the PET film into water at 100 ℃ for stewing for 60min, and observing whether the surface of the film wrinkles, ink drops and whether handwriting is clear and visible after cooling.
3 gloss measurement: the gloss test was carried out according to the method GB/T13217.2-2009, the test results being given in the table below.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of adaptation of the invention, and further modifications can be easily implemented by those skilled in the art, so that the invention is not limited to the specific details and the embodiments shown herein without departing from the general concept defined by the claims and the scope of equivalents.
Claims (8)
1. The steaming-resistant waterborne polyurethane printing ink for gravure printing is characterized by comprising the following components in parts by weight:
50-60 parts of waterborne polyurethane resin, 20-30 parts of modified carbon black, 1-3 parts of sodium polyacrylate dispersant, 1-3 parts of waterborne organic silicon defoamer, 0.5-1 part of alkyl sodium sulfonate antistatic agent and 40-50 parts of water.
2. The gravure steaming-resistant waterborne polyurethane ink as claimed in claim 1, wherein the preparation method of the modified carbon black comprises the following steps:
1) adding carbon black into a nitric acid aqueous solution, stirring for oxidation reaction, filtering, separating, washing with water, and drying in an oven to obtain oxidized modified carbon black;
2) adding an epoxy silane coupling agent into a mixed solution of ethanol and water, heating and stirring to obtain a silane coupling agent hydrolysate, adding the oxidized modified carbon black into the silane coupling agent hydrolysate, heating and stirring to obtain coupling agent modified carbon black;
3) adding sodium alginate into deionized water, stirring and dissolving to prepare a sodium alginate solution, adding a sodium hydroxide catalyst, heating to the temperature of 100-110 ℃, then adding a coupling agent modified carbon black, and carrying out heat preservation reaction to obtain the modified carbon black.
3. The gravure boiling-resistant aqueous polyurethane ink as claimed in claim 2, wherein the oxidation reaction time in the step 1) is controlled to be 7 to 8.5 hours.
4. The gravure steaming-resistant aqueous polyurethane ink as claimed in claim 2, wherein the mass ratio of the oxidation-modified carbon black to the epoxy silane coupling agent in the step 2) is 1: 0.1-0.3.
5. The gravure boiling-resistant aqueous polyurethane ink as claimed in claim 2, wherein the concentration by mass of the sodium alginate solution in the step 3) is 1 to 5%.
6. The gravure steaming-resistant waterborne polyurethane ink as claimed in claim 2, wherein the amount of the sodium hydroxide catalyst added in the step 3) is 2-3% of the mass of the sodium alginate solution.
7. The gravure boiling-resistant aqueous polyurethane ink as claimed in claim 2, wherein the heat-preserving reaction time in the step 3) is 2 to 5 hours.
8. A process for the preparation of the gravure cooking resistant aqueous polyurethane ink as claimed in any of claims 1 to 7, characterized in that it comprises the following steps: adding the waterborne polyurethane resin, the waterborne organic silicon defoamer, the sodium alkyl sulfonate antistatic agent and water into a stirring kettle, stirring for 40-60min at the speed of 300-400r/min, then adding the sodium polyacrylate dispersant and the modified carbon black, and stirring for 30-40min at the speed of 700-800 r/min.
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| CN116875109A (en) * | 2023-07-12 | 2023-10-13 | 广东恩美化工科技股份有限公司 | Preparation method of polyurethane black ink |
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