CN112280378A

CN112280378A - Environment-friendly water-based ink for printing packaging cartons and preparation method thereof

Info

Publication number: CN112280378A
Application number: CN202011275939.0A
Authority: CN
Inventors: 黄展才
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-16
Filing date: 2020-11-16
Publication date: 2021-01-29

Abstract

The invention relates to the technical field of printing ink, in particular to environment-friendly water-based printing ink for printing of a packaging carton and a preparation method thereof, wherein the environment-friendly water-based printing ink comprises the following raw materials in parts by weight: 70-80 parts of water-soluble acrylic resin; 50-65 parts of water; 30-40 parts of water-based pigment; 2-4 parts of ethanol; 0.5-1 part of star anise oil; 0.5-1 part of 5-chloro-2-methyl-4-isothiazolin-3-one; 3-5 parts of a pH value stabilizer; 0.3-0.5 part of a dispersing agent; 0.3-0.5 part of emulsified silicone oil; 3-5 parts of sodium carboxymethyl starch and 1-2 parts of nano calcium carbonate. The water-based ink prepared by the method is safe and environment-friendly, has good wear resistance and water resistance, has the characteristics of antibiosis, mildew prevention and discoloration prevention, meets the requirements on the content of heavy metals such as cadmium, lead, mercury and the like in the water-based ink, and can be widely applied to printing of outer packaging cartons such as food and the like.

Description

Environment-friendly water-based ink for printing packaging cartons and preparation method thereof

Technical Field

The invention relates to the technical field of printing ink, in particular to environment-friendly water-based printing ink for printing of a packaging carton and a preparation method thereof.

Background

With the development of social culture, science and technology and economy, the printing industry is developing at an unprecedented speed, and the ink is an important material for printing, is used for expressing patterns and characters on a printing stock through printing or inkjet printing, and is used for various printings such as books, periodicals, packaging decoration, building decoration, electronic circuit boards and the like. As social demands increase, ink varieties and yields also expand and grow accordingly. The printing ink is used in a large amount in the printing industry and mainly comprises components such as resin, pigment, solvent, auxiliary agents and the like, most of the printing ink used in the current printing industry is solvent-based printing ink, VOCs harmful to human bodies and the environment can be emitted by the printing ink, some printing ink directly contacting with the human bodies can cause harm to the human bodies, and some harmful substances can even permeate into packages such as food, medicines and the like through packaging. The ink is the largest pollution source in the printing industry, and the pollution discharge amount of Volatile Organic Compounds (VOC) caused by the ink every year is large, so that the atmospheric environment is seriously polluted, and the health of human beings is directly harmed.

With the continuous development of ink technology to high technology, people's awareness of environmental protection is continuously improved, and the development of environment-friendly ink is the first problem to be considered in ink development in future. The environment-friendly ink mainly changes the components of the ink, namely, the novel ink is prepared from environment-friendly raw materials. At present, the environmental protection ink mainly comprises water-based ink, UV ink, water-based UV ink and some alcohol-soluble ink. The water-based ink is a green printing material which is being popularized and used. The most difference between the water-based ink and the solvent ink is that the solvent used in the former is water, and the most characteristic is that the discharge amount of volatile organic compounds (VOC for short) is obviously reduced, so that the water-based ink prevents air pollution, and is a recognized environment-friendly printing material in the world.

The water-based ink takes water as a main solvent, almost has no Volatile Organic Compound (VOC) emission, and has no pollution to the atmosphere; the water is the cheapest solvent, so the manufacturing cost of the water-based ink is lower than that of any kind of printing ink, the water-based ink has the advantage of low cost, the manufacturing environment of the water-based ink is safe, the body health of operators is guaranteed, the resource consumption (such as petroleum) can be reduced, the environmental protection cost is reduced, the organic residues in printed matters can be reduced or even eliminated in the water-based ink printing process, and the sanitation and safety of users are ensured. The predominant field of application for aqueous inks is nowadays packaging upholstery printing, where corrugated cardboard packaging takes up a considerable proportion. Corrugated paper boxes are ideal packaging containers, have the characteristics of lightness, firmness, vibration reduction and suitability for mechanized production, and are used for transport packaging and sale packaging for many years.

Although water-based inks have been developed in the market, the ink is often single in function and poor in printing adaptability. There are still some problems in the aspect of environment-friendly water-based ink for packaging carton printing: for example, the environment-friendly water-based ink for printing on the surface of the carton has small adhesive force, poor water resistance and non-wear-resistant ink film, and printed patterns and/or characters on the surface of the corrugated carton are easy to blur or fall off in the using process, so that the appearance and the using experience are influenced, and even the production process is influenced; the water-based ink for corrugated cases is easy to absorb moisture and decolorize after moisture absorption, and a plurality of packaging products printed by the water-based ink are easy to mildew, so that the appearances of the packaging products are seriously affected, and even the packaged products cannot be effectively protected. Certain inks for printing which are highly hygienic are highly sensitive to heavy metals such as: lead, arsenic and the like are strictly limited, so that a plurality of ink on the current market cannot reach the standard.

Disclosure of Invention

The water-based ink prepared by the method is safe, environment-friendly, good in wear resistance and water resistance, and has the characteristics of antibiosis, mould prevention and discoloration prevention, and the content of heavy metals such as cadmium, lead and mercury in the water-based ink meets the requirement, so that the water-based ink can be widely applied to printing of outer packaging cartons such as food.

In order to achieve the purpose, the invention adopts the following technical scheme:

the environment-friendly water-based ink for printing of the packaging carton comprises the following raw materials in parts by weight: 70-80 parts of water-soluble acrylic resin; 50-65 parts of water; 30-40 parts of water-based pigment; 2-4 parts of ethanol; 0.5-1 part of star anise oil; 0.5-1 part of 5-chloro-2-methyl-4-isothiazolin-3-one; 3-5 parts of a pH value stabilizer; 0.3-0.5 part of a dispersing agent; 0.3-0.5 part of emulsified silicone oil; 3-5 parts of sodium carboxymethyl starch; 1-2 parts of nano calcium carbonate.

In the environment-friendly water-based ink for printing on the packaging carton, the dispersant is triethyl hexyl phosphoric acid or polyoxyethylene glycol alkyl ester.

In the environment-friendly water-based ink for printing on the packaging carton, the pH stabilizer is triethanolamine buffer or dimethylacetamide buffer with the pH value of 8.5.

The preparation method of the environment-friendly water-based ink for printing the packaging carton comprises the following steps:

(1) taking the raw materials according to the parts by weight for standby, firstly adding water into a reaction kettle, controlling the temperature of the reaction kettle to be between 80 and 90 ℃, then slowly and sequentially adding water-soluble acrylic resin, ethanol and emulsified silicone oil under the stirring condition, preserving heat for 40 to 50 minutes, and uniformly mixing and stirring to form a bottom material;

(2) reducing the temperature of the reaction kettle to 35-40 ℃, adding a pH stabilizer into the bottom material obtained in the step (1), and adjusting the pH value of the bottom material to 8-8.5;

(3) adding a dispersing agent into the backing material, then adding the water-based pigment, the nano calcium carbonate and the sodium carboxymethyl starch, stirring and dispersing for 40-50 min at a high speed in a high-speed dispersing machine, and then carrying out reflux grinding for 10-15 hours by using a grinding machine;

(4) adding star anise oil and 5-chloro-2-methyl-4-isothiazolin-3-one according to the weight parts, continuously grinding until the particle size of the obtained slurry is less than or equal to 10 mu m, and discharging to obtain the environment-friendly water-based ink for printing of the packaging carton.

The star anise oil used in the invention is obtained by steam distillation of star anise (Illicium verum) fruits, is colorless or light yellow clear liquid, contains volatile oil, organic acids, flavonoids, anisole, anisaldehyde and other effective components, has an antibacterial effect, has good insecticidal activity and an anti-free radical oxidation effect, and has strong fumigating and contact killing effects on insects. The star anise oil has good bacteriostatic and antibacterial effects, and in vitro experiments show that: the alcohol extract has antibacterial effect on gram-positive bacteria such as Staphylococcus aureus, pneumococcus, and diphtheria bacillus; benzoic acid and salicylic acid with antibacterial effect on gram-negative bacteria such as Bacillus subtilis, Escherichia coli, Vibrio cholerae, Bacillus typhi, Bacillus paratyphi, and Bacillus dysenteriae, and with antibacterial effect on fungi greater than 1%.

The 5-chloro-2-methyl-4-isothiazoline-3-ketone used in the invention is a high-activity bactericide, has the minimum inhibitory concentration of less than 10mg/l for a plurality of microorganisms, has extremely strong killing and inhibiting effects on bacteria, mould, yeast and algae, and is effective at low concentration. The product has good safety, low toxicity, biodegradability, no teratogenic and mutagenic reaction, and stability in acidic and oxidative environments; the 5-chloro-2-methyl-4-isothiazoline-3-ketone is adopted as one of the raw materials to prepare the water-based ink, so that the putrefaction and deterioration of the ink can be prevented, the mildew-proof and antibacterial properties of the water-based ink can be improved, the capability of resisting the invasion of mildew can be improved, and the mildew-proof capability of a packaging carton product printed by the water-based ink can be further improved.

The carboxymethyl starch sodium (CMS) used in the invention is modified starch etherified with carboxymethyl, is anionic starch ether, is tasteless, nontoxic and not easy to mildew, is dissolved in water to form colloidal solution, and is stable to light and heat. The performance is superior to carboxymethyl cellulose (CMC), and the CMC-substituted carboxymethyl cellulose is the best product. The aqueous solution of CMS is stable and has excellent performance, and has the functions of adhesion, thickening, water retention, emulsification, suspension, dispersion and the like. The raw material of CMS is starch, which has wide source and low price. CMS used for printing and dyeing is used as a carrier paste of dye and printing and dyeing auxiliary agent, and has the advantages of good compatibility and stability. The dye paste formulated with CMS also has good penetration, especially in the case of deep and through-cut embossing of fabrics, allows rapid pattern formation and significantly improves the vividness of the print. In addition, the CMS can be dissolved by cold water, and the use is convenient.

The invention has the beneficial effects that:

1. the environment-friendly water-based ink for printing the packaging carton, which is prepared by the invention, adopts water as a solvent, does not contain benzene and ketone solvents, and other raw materials are nontoxic or low-toxic components to human bodies and environments, so that the harmful components of the ink are greatly reduced, Volatile Organic Compounds (VOC) are not discharged, the environment is not polluted, and the human health is not threatened.

2. The water-based ink prepared by the method has good adhesive force, can be quickly attached to the surface of a packaging carton, has good printing adaptability and can be quickly dried completely, and characters or patterns printed by the water-based ink are smooth and bright in color. The environment-friendly water-based ink prepared by the method has the characteristics of good wear resistance and water resistance and decoloration prevention when being used for printing of a packaging carton, is not easy to blur, drop or discolor patterns and/or characters on the surface of the printing carton, has stable product quality, has the effects of antibiosis and mildew prevention, and is not easy to mildew of the packaging carton printed by the prepared water-based ink.

Detailed Description

Example 1

The environment-friendly water-based ink for printing of the packaging carton comprises the following raw materials in parts by weight: 70 parts of water-soluble acrylic resin; 50 parts of water; 30 parts of water-based pigment; 2 parts of ethanol; 0.5 part of star anise oil; 0.5 part of 5-chloro-2-methyl-4-isothiazolin-3-one; 3 parts of triethanolamine buffer with the pH value of 8.5; 0.3 part of dispersing agent triethylhexyl phosphoric acid; 0.3 part of emulsified silicone oil; 3 parts of sodium carboxymethyl starch; 1 part of nano calcium carbonate;

(1) taking the raw materials according to the parts by weight for standby, firstly adding water into a reaction kettle, controlling the temperature of the reaction kettle at 80 ℃, then slowly and sequentially adding water-soluble acrylic resin, ethanol and emulsified silicone oil under the stirring condition, preserving the heat for 50 minutes, and uniformly mixing and stirring to form a bottom material;

(2) reducing the temperature of the reaction kettle to 35-40 ℃, adding a triethanolamine buffering agent with the pH value of 8.5 into the bottom material obtained in the step (1), and adjusting the pH value of the bottom material to 8-8.5;

(3) adding a dispersing agent of triethyl hexyl phosphoric acid into the bottom materials, then adding the water-based pigment, the nano calcium carbonate and the sodium carboxymethyl starch, stirring and dispersing for 40min at a high speed in a high-speed dispersion machine, and then carrying out reflux grinding for 15 hours by using a grinding machine;

Example 2

The environment-friendly water-based ink for printing of the packaging carton comprises the following raw materials in parts by weight: 75 parts of water-soluble acrylic resin; 60 parts of water; 35 parts of water-based pigment; 3 parts of ethanol; 0.7 part of star anise oil; 0.8 part of 5-chloro-2-methyl-4-isothiazolin-3-one; 4 parts of dimethylacetamide buffer with the pH value of 8.5; 0.4 part of dispersant polyoxyethylene glycol alkyl ester; 0.4 part of emulsified silicone oil; 4 parts of sodium carboxymethyl starch; 1.2 parts of nano calcium carbonate;

(1) taking the raw materials according to the parts by weight for later use, firstly adding water into a reaction kettle, controlling the temperature of the reaction kettle at 85 ℃, then slowly and sequentially adding water-soluble acrylic resin, ethanol and emulsified silicone oil under the stirring condition, preserving the temperature for 45 minutes, and uniformly mixing and stirring to form a bottom material;

(2) reducing the temperature of the reaction kettle to 35-40 ℃, adding a dimethylacetamide buffering agent with the pH value of 8.5 into the bottom material obtained in the step (1), and adjusting the pH value of the bottom material to 8-8.5;

(3) adding a dispersing agent polyoxyethylene glycol alkyl ester into a backing material, then adding a water-based pigment, nano calcium carbonate and sodium carboxymethyl starch, stirring and dispersing for 45min at a high speed in a high-speed dispersion machine, and then carrying out reflux grinding for 13 hours by using a grinding machine;

Example 3

The environment-friendly water-based ink for printing of the packaging carton comprises the following raw materials in parts by weight: 76 parts of water-soluble acrylic resin; 61 parts of water; 36 parts of a water-based pigment; 3.5 parts of ethanol; 0.8 part of star anise oil; 0.7 part of 5-chloro-2-methyl-4-isothiazolin-3-one; 4.5 parts of triethanolamine buffer with the pH value of 8.5; 0.45 part of dispersing agent triethylhexyl phosphoric acid; 0.45 part of emulsified silicone oil; 4.5 parts of sodium carboxymethyl starch; 1.5 parts of nano calcium carbonate;

(1) taking the raw materials according to the parts by weight for standby, firstly adding water into a reaction kettle, controlling the temperature of the reaction kettle to be between 80 and 90 ℃, then slowly and sequentially adding water-soluble acrylic resin, ethanol and emulsified silicone oil under the stirring condition, preserving heat for 45 minutes, and uniformly mixing and stirring to form a bottom material;

(3) adding a dispersing agent of triethyl hexyl phosphoric acid into the bottom materials, then adding the water-based pigment, the nano calcium carbonate and the sodium carboxymethyl starch, stirring and dispersing for 46min at a high speed in a high-speed dispersion machine, and then carrying out reflux grinding for 12 hours by using a grinding machine;

Example 4

The environment-friendly water-based ink for printing of the packaging carton comprises the following raw materials in parts by weight: 80 parts of water-soluble acrylic resin; 65 parts of water; 40 parts of water-based pigment; 4 parts of ethanol; 1 part of star anise oil; 1 part of 5-chloro-2-methyl-4-isothiazolin-3-one; 5 parts of dimethylacetamide buffer with the pH value of 8.5; 0.5 part of dispersant polyoxyethylene glycol alkyl ester; 0.5 part of emulsified silicone oil; 5 parts of sodium carboxymethyl starch; 2 parts of nano calcium carbonate;

(1) taking the raw materials according to the parts by weight for standby, firstly adding water into a reaction kettle, controlling the temperature of the reaction kettle at 90 ℃, then slowly and sequentially adding water-soluble acrylic resin, ethanol and emulsified silicone oil under the stirring condition, preserving the heat for 40 minutes, and uniformly mixing and stirring to form a bottom material;

(3) adding a dispersing agent polyoxyethylene glycol alkyl ester into a backing material, then adding a water-based pigment, nano calcium carbonate and sodium carboxymethyl starch, stirring and dispersing for 50min at a high speed in a high-speed dispersion machine, and then carrying out reflux grinding for 10 hours by using a grinding machine;

Quality detection

Firstly, the quality of the environment-friendly water-based ink for printing of the packaging carton prepared in the embodiment 2 of the invention is detected, and the antibacterial performance of escherichia coli of the water-based ink is measured, wherein the antibacterial effect detection method comprises the following steps: cutting the paper coated with the water-based ink prepared in example 2 into a circular paper with the diameter of 8mm, and tightly attaching the circular paper to a surface dish coated with bacteria; the petri dish was placed in a constant temperature environment at 30 ℃ and after 24 hours, the diameter of the zone of inhibition generated by the petri dish was measured. The results are shown in table 1:

therefore, the environment-friendly water-based ink for printing of the packaging carton, which is prepared by the invention, has the advantages of good tinting strength, water resistance and scratch resistance, moderate viscosity, good storage stability and excellent antibacterial performance.

And secondly, detecting heavy metals such as cadmium, lead, mercury and the like in the environment-friendly water-based ink for printing of the packaging cartons, which is prepared in the embodiment 2 of the invention, by referring to IEC 62321-4:2013+ A1:2017, IEC 62321-5:2013, IEC 62321-7-2:2017, IEC 62321-6:2015 and IEC 62321-8:2017, and analyzing by adopting ICP-OES, UV-Vis and GC-MS.

Tests performed on the basis of the samples delivered showed that the test results for cadmium, lead, mercury, hexavalent chromium, polybrominated biphenyls (PBBs), polybrominated diphenyl ethers (PBDEs), phthalic acid esters such as dibutyl phthalate (DBP), Butyl Benzyl Phthalate (BBP), di (2-ethylhexyl) phthalate (DEHP) and diisobutyl phthalate (DIBP) meet the limit requirements of the european union RoHS directive 2011/65/EU appendix II correction directive (EU) 2015/863. The environment-friendly water-based ink for printing the packaging carton, which is prepared by the invention, has the advantages of no toxicity, no harm and environmental protection when being used for printing the packaging carton, is safe and environment-friendly, and can be widely applied to printing of external packaging cartons such as food.

Claims

1. The environment-friendly water-based ink for printing of the packaging carton is characterized by comprising the following raw materials in parts by weight: 70-80 parts of water-soluble acrylic resin; 50-65 parts of water; 30-40 parts of water-based pigment; 2-4 parts of ethanol; 0.5-1 part of star anise oil; 0.5-1 part of 5-chloro-2-methyl-4-isothiazolin-3-one; 3-5 parts of a pH value stabilizer; 0.3-0.5 part of a dispersing agent; 0.3-0.5 part of emulsified silicone oil; 3-5 parts of sodium carboxymethyl starch; 1-2 parts of nano calcium carbonate.

2. The environmentally friendly aqueous ink for printing on a packaging carton according to claim 1, wherein the dispersant is triethylhexylphosphoric acid or polyoxyethylene glycol alkyl ester.

3. The environment-friendly aqueous ink for printing on a packaging carton according to claim 1, wherein the pH stabilizer is triethanolamine buffer or dimethylacetamide buffer with a pH of 8.5.

4. The environment-friendly water-based ink for printing on packaging cartons as claimed in claim 1, wherein the preparation method comprises the following steps: