Antibacterial microcapsule ink as well as preparation method and application thereof

Abstract

The invention discloses antibacterial microcapsule ink as well as a preparation method and application thereof, and the antibacterial microcapsule ink comprises the following components in percentage by mass: 30%-35% of waterborne acrylic resin, 5%-8% of a cosolvent, 10%-25% of a pigment, 10%-15% of antibacterial microcapsules, 25%-30% of deionized water, 3%-5% of an emulsifier Span 80, 1%-2% of a dispersing agent and 2%-4% of an additive. The problems that common cigarette ink is low in safety, poor in stability and prone to being affected and mildewed after printing are solved. The antibacterial microcapsule ink is researched and developed, so that the peculiar smell of cigarette packaging can be reduced, the fragrance can be improved, the mildew-proof effect is achieved, the novelty can be improved, more consumers can be attracted, and the characteristics of brand cigarettes can be manifested.

Description

Technical Field

[0001] The present invention relates to the technical field of tobacco ink, and in particular to an antibacterial microcapsule ink and a preparation method and application thereof. Background Art

[0002] Cigarette ink is a key raw material and auxiliary ingredient in the production of tobacco materials, playing an irreplaceable role in the cigarette manufacturing process. Traditional inks contain large amounts of organic solvents, which are highly harmful to humans and the environment. Furthermore, they are susceptible to environmental fluctuations, and dust and bacteria can cause mold to form during transportation.

[0003] Microcapsules are a process that uses a film-forming material to encapsulate solids, gases, or liquids into tiny particles. The film-forming material serves as the wall material, while the encapsulated material serves as the core material. Microencapsulation technology isolates substances from the surrounding environment, protecting them from external factors such as light, heat, and pressure. It also reduces the volatility of the encapsulated substance and improves its stability. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an antibacterial microcapsule ink and a preparation method and application thereof, which overcome the above-mentioned defects of the prior art.

[0005] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0006] An antibacterial microcapsule ink comprises the following components in percentage by mass: 30% to 35% of water-based acrylic resin, 5% to 8% of cosolvent, 10% to 25% of pigment, 10% to 15% of antibacterial microcapsules, 25% to 30% of deionized water, 3% to 5% of emulsifier Sban 80, 1% to 2% of dispersant, and 2% to 4% of additives.

[0007] Preferably, the above technical solution includes the following components in percentage by mass: 30% water-based acrylic resin, 8% cosolvent, 15% pigment, 12% antibacterial microcapsule, 28% deionized water, 5% emulsifier Sban 80, 1.5% dispersant, and 4% additives.

[0008] Preferably, in the above technical solution, the cosolvent is ethanol, the dispersant is polyacrylate, and the additive is one or more of a thickener, a leveling agent, a defoaming agent and a preservative.

[0009] Preferably, in the above technical solution, the antibacterial microcapsules are prepared with chitosan as the wall material and cinnamon essential oil as the core material by complex coacervation method to obtain a regular and uniform spherical structure.

[0010] A method for preparing an antibacterial microcapsule ink comprises the following steps:

[0011] (1) Dissolve a certain amount of chitosan in 1% glacial acetic acid solution and disperse it by ultrasonic to form a transparent and clear chitosan solution;

[0012] (2) Stirring Span 80 and cinnamon essential oil at room temperature to uniformly emulsify them to form a milky white liquid, adding the emulsified solution to the chitosan solution of step (1), and mixing by ultrasonication;

[0013] (3) slowly adding a 4% sodium tripolyphosphate solution by mass to the mixed solution in step (2) to carry out an ionic crosslinking reaction, and freeze-drying after the reaction to obtain antibacterial microcapsules;

[0014] (4) Add an appropriate amount of pigment, dispersant and deionized water into a container and stir until uniformly moistened, then add a cosolvent and continue stirring to form a slurry; then add a certain amount of water-based acrylic resin into the above slurry and stir until mixed, then add the antibacterial microcapsules prepared in step (3), Span 80 and additives, and homogenize to obtain ink.

[0015] Preferably, in the above technical solution, the mass volume ratio of chitosan to glacial acetic acid solution in step (1) is (0.16-0.20): (80-120).

[0016] Preferably, in the above technical solution, the mass ratio of Span 80, cinnamon essential oil, and sodium tripolyphosphate solution is (0.34-0.40):(0.38-0.42):(0.8-1); in step (2), the stirring speed is 500-1500 rpm, and the time is 2-4 hours; the ultrasonic time is 40-60 minutes; and in step (3), the freezing time is 24-48 hours.

[0017] Preferably, in the above technical solution, in step (4), the dispersant is a polyacrylate, and the addition amount is 1% to 2%; the addition amount of deionized water is 25% to 30%; the addition amount of pigment is 10% to 25%; the cosolvent is ethanol, and the addition amount is 5% to 8%; the addition amount of water-based acrylic resin is 30% to 35%; the addition amount of antibacterial microcapsules is 10% to 15%; the additives include thickeners, leveling agents, defoaming agents or preservatives, and the addition amount is 2% to 4%.

[0018] Application of antibacterial microcapsule ink in cigarette packaging printing.

[0019] The invention embeds cinnamon essential oil in chitosan solution by using a complex coacervation method to prepare microcapsules with stable chemical properties, and applies the microcapsules to the ink system of cigarette packaging.

[0020] Cinnamon essential oil is a non-toxic, low-cost, highly active natural plant essential oil with a strong antibacterial effect. It is widely used in the food and chemical industries. Experiments have shown that cinnamon essential oil can inhibit pathogen infection during the storage and transportation of apples and tomatoes, keeping the fruits fresh. It is a natural food preservative.

[0021] The complex coacervation method has mild reaction conditions, causes little damage to the quality of the embedded spices during processing, does not require professional equipment, is low-cost, highly efficient, and has good yield. The resulting microcapsules have a relatively uniform particle size and strong chemical stability. They are widely used in the encapsulation process of food ingredients and have a good effect on preventing the spoilage of ingredients and improving sensory properties.

[0022] Antibacterial microcapsules prepared by complex coacervation are added to the preparation process of tobacco ink to produce tobacco ink with fragrance and antibacterial effects, which is then used in the printing process of cigarette packages. This can not only reduce the risk of cigarettes being contaminated by bacteria during transportation and reduce the loss of cigarette products during storage and transportation, but also improve brand competitiveness, enhance the characteristics of cigarette brands, and enhance novelty.

[0023] Cigarette packs are not just packaging carriers for cigarettes. To a certain extent, they represent the image of a company. With the continuous development of the cigarette industry, cigarette packaging is also constantly seeking new designs. Brand-new and uniquely designed product packaging can promote consumer purchases.

[0024] The above technical solution of the present invention has the following beneficial effects:

[0025] The present invention proposes an antibacterial microcapsule and a method for applying the same in tobacco ink. The ink after adding the antibacterial microcapsules has the following technical effects: cinnamon essential oil is a natural organic antibacterial substance that has a good inhibitory effect on molds and bacilli, and is non-toxic to the human body and the environment. The microcapsules are prepared by a complex coacervation method, which is low-cost and does not require specialized experimental equipment. Using microencapsulation technology, cinnamon essential oil is prepared into microcapsules and applied in the production process of water-based ink. The resulting antibacterial ink has the advantages of being green and non-toxic compared to traditional inks, and has an inhibitory effect on bacilli and molds, which can improve the antibacterial efficiency. Applying this ink in the cigarette pack printing process can reduce the loss of cigarette packs due to mildew, and also provides certain theoretical guidance for the future research and development of antibacterial inks. DETAILED DESCRIPTION

[0026] Various exemplary embodiments of the present invention will now be described in detail. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0027] Unless otherwise specified, the experimental methods used in the following examples are all conventional methods. The materials and reagents used are all commercially available unless otherwise specified. The equipment used in the experiments are all well known to those skilled in the art unless otherwise specified.

[0028] Example 1

[0029] This embodiment provides an antibacterial microcapsule ink, the components and percentages of which are: 35% water-based acrylic resin, 8% ethanol, 10% pigment, 10% antibacterial microcapsules, 28% deionized water, 5% Span 80, 1.5% dispersant, 0.5% thickener, 0.4% leveling agent, 0.6% defoaming agent, and 1% preservative.

[0030] The preparation process and dosage of antibacterial microcapsules are as follows:

[0031] Weigh 0.18 g of chitosan, add 100 ml of a prepared 1% glacial acetic acid solution, and disperse it by ultrasonic for 40 minutes to form a clear and transparent chitosan solution, which is then stored for later use.

[0032] 0.36 g of emulsifier Span 80 and 0.42 g of cinnamon essential oil were weighed and stirred at 500 rpm on a magnetic stirrer at room temperature to uniformly emulsify the mixture. The emulsified solution was added to the prepared chitosan solution and ultrasonically dispersed for 1 hour.

[0033] 0.08 g of a sodium tripolyphosphate solution with a mass fraction of 4% was weighed and slowly added dropwise to the chitosan solution to carry out an ionic cross-linking reaction. After the cross-linking reaction was completed, the solution was freeze-dried for 24 hours to prepare antibacterial microcapsules.

[0034] Preparation of antibacterial microcapsule ink:

[0035] Add pigment, dispersant and deionized water into a container and stir at a low speed of 500 r / min until uniformly wetted. Then add cosolvent, increase the speed to 1500 r / min, and stir to form a slurry.

[0036] Subsequently, water-based acrylic resin was added to the slurry and stirred until uniformly mixed. Then, the prepared antibacterial microcapsules, Span 80 and additives were added and homogenized to obtain ink.

[0037] Example 2

[0038] This embodiment provides an antibacterial microcapsule ink, the components and percentages of which are: 30% water-based acrylic resin, 8% ethanol, 15% pigment, 12% antibacterial microcapsules, 28% deionized water, 3% Span 80, 1.5% dispersant, 0.5% thickener, 0.4% leveling agent, 0.6% defoaming agent, and 1% preservative.

[0039] The preparation process and dosage of antibacterial microcapsules are as follows:

[0040] Weigh 0.18 g of chitosan, add 100 ml of a prepared 1% glacial acetic acid solution, and disperse it by ultrasonic for 40 minutes to form a clear and transparent chitosan solution, which is then stored for later use.

[0041] 0.36 g of emulsifier Span 80 and 0.42 g of cinnamon essential oil were weighed and stirred at 500 rpm on a magnetic stirrer at room temperature to uniformly emulsify the mixture. The emulsified solution was added to the prepared chitosan solution and ultrasonically dispersed for 1 hour.

[0042] 0.08 g of a sodium tripolyphosphate solution with a mass fraction of 4% was weighed and slowly added dropwise to the chitosan solution to carry out an ionic cross-linking reaction. After the cross-linking reaction was completed, the solution was freeze-dried for 24 hours to prepare antibacterial microcapsules.

[0043] Preparation of antibacterial microcapsule ink:

[0044] Add pigment, dispersant and deionized water into a container and stir at a low speed of 500 r / min until uniformly wetted. Then add cosolvent, increase the speed to 1500 r / min, and stir to form a slurry.

[0045] Subsequently, water-based acrylic resin was added to the slurry and stirred until uniformly mixed. Then, the prepared antibacterial microcapsules, Span 80 and additives were added and homogenized to obtain ink.

[0046] Example 3

[0047] This embodiment provides an antibacterial microcapsule ink, the components and percentages of which are: 35% water-based acrylic resin, 8% ethanol, 10% pigment, 10% antibacterial microcapsules, 28% deionized water, 5% Span 80, 1.5% dispersant, 0.5% thickener, 0.4% leveling agent, 0.6% defoaming agent, and 1% preservative.

[0048] The preparation process and dosage of antibacterial microcapsules are as follows:

[0049] Weigh 0.18 g of chitosan and add it to 100 ml of a prepared 1% glacial acetic acid solution. Ultrasonic dispersion is performed for 60 minutes to form a clear and transparent chitosan solution, which is then stored for later use.

[0050] 0.36 g of emulsifier Span 80 and 0.42 g of cinnamon essential oil were weighed and stirred at 1000 rpm on a magnetic stirrer at room temperature until uniformly emulsified. The emulsified solution was added to the prepared chitosan solution and ultrasonically dispersed for 1 hour.

[0051] 0.08 g of a prepared sodium tripolyphosphate solution with a mass fraction of 4% was weighed and slowly added dropwise to the chitosan solution to carry out an ionic cross-linking reaction. After the cross-linking reaction was completed, the solution was freeze-dried for 24 hours to prepare antibacterial microcapsules.

[0052] Preparation of antibacterial microcapsule ink:

[0053] Add pigment, dispersant and deionized water into a container and stir at a low speed of 500 r / min until uniformly wetted. Then add cosolvent, increase the speed to 1500 r / min, and stir to form a slurry.

[0054] Subsequently, water-based acrylic resin was added to the slurry and stirred until uniformly mixed. Then, the prepared antibacterial microcapsules, Span 80 and additives were added and homogenized to obtain ink.

[0055] Example 4

[0056] This embodiment provides an antibacterial microcapsule ink, the components and percentages of which are: 35% water-based acrylic resin, 8% ethanol, 10% pigment, 10% antibacterial microcapsules, 28% deionized water, 5% Span 80, 1.5% dispersant, 0.5% thickener, 0.4% leveling agent, 0.6% defoaming agent, and 1% preservative.

[0057] The preparation process and dosage of antibacterial microcapsules are as follows:

[0058] Weigh 0.18 g of chitosan and add it to 100 ml of a prepared 1% glacial acetic acid solution. Ultrasonic dispersion is performed for 60 minutes to form a clear and transparent chitosan solution, which is then stored for later use.

[0059] 0.36 g of emulsifier Span 80 and 0.38 g of cinnamon essential oil were weighed and stirred at 1500 rpm on a magnetic stirrer at room temperature until uniformly emulsified. The emulsified solution was added to the prepared chitosan solution and ultrasonically dispersed for 1.5 h.

[0060] 0.08 g of a prepared sodium tripolyphosphate solution with a mass fraction of 4% was weighed and slowly added dropwise to the chitosan solution to carry out an ionic cross-linking reaction. After the cross-linking reaction was completed, the solution was freeze-dried for 48 hours to prepare antibacterial microcapsules.

[0061] Preparation of antibacterial microcapsule ink:

[0062] Add pigment, dispersant and deionized water into a container and stir at a low speed of 500 r / min until uniformly wetted. Then add cosolvent, increase the speed to 1500 r / min, and stir to form a slurry.

[0063] Subsequently, water-based acrylic resin was added to the slurry and stirred until uniformly mixed. Then, the prepared antibacterial microcapsules, Span 80 and additives were added and homogenized to obtain ink.

[0064] Performance testing:

[0065] Antimicrobial Performance Testing: According to the national standard GB-T21866, the prepared antimicrobial ink and commercially available ink were applied to a sample. The ink was applied twice, with the second coat applied after the first coat was dry. The sample should be flat and free of contamination. Before testing, the sample should be sterilized under ultraviolet light in a clean bench.

[0066] The test bacteria are Staphylococcus aureus, Escherichia coli and Penicillium. Take 0.4ml to 0.5ml of the bacterial solution and drop it on the commercial ink sample and antibacterial paint sample respectively. Use the film method to make the bacteria evenly contact the sample. After culturing for a period of time, the number of live bacteria in the sample is detected and the antibacterial rate is calculated; another control group is prepared, and the number of live bacteria and the antibacterial rate in the sample are measured after the samples are placed at room temperature for six months.

[0067] Table 1

[0068]

[0069] The test results in Table 1 above demonstrate that the antibacterial microcapsule ink provided by this technology exhibits excellent antibacterial efficacy. Examples 1-3 show that increasing the microcapsule content in the ink enhances its inhibitory effect on bacteria and fungi. During the experiments, even stirring of the solution and the uniform dispersion of the emulsifier and essential oil also influenced the antibacterial efficacy. In Example 4, compared to Example 1, the amount of cinnamon essential oil added was reduced, resulting in a slight decrease in the antibacterial efficacy.

[0070] Table 2

[0071]

[0072] According to the data in Table 2, after the samples were placed under normal temperature and pressure for 6 months, the antibacterial rate of the microcapsule ink was higher than that of the commercially available ink. In addition, although the antibacterial rates of the control groups 1-4 after 6 months were lower than those of the examples 1-4, the decrease was small, indicating that the microcapsule technology can indeed delay the release of cinnamon essential oil during storage and make the antibacterial effect of the ink last for a long time.

[0073] Although the present invention has been disclosed above by way of embodiments, they are not intended to limit the present invention. Any person skilled in the art may make various choices and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention is defined by the claims and their equivalents.

Claims

1. An antibacterial microcapsule ink, characterized in that: The invention comprises the following components in percentage by weight: 30% to 35% of water-based acrylic resin, 5% to 8% of cosolvent, 10% to 25% of pigment, 10% to 15% of antibacterial microcapsule, 25% to 30% of deionized water, 3% to 5% of emulsifier Sban 80, 1% to 2% of dispersant and 2% to 4% of additives.

2. The antibacterial microcapsule ink according to claim 1, characterized in that: The invention comprises the following components in percentage by weight: 30% of water-based acrylic resin, 8% of cosolvent, 15% of pigment, 12% of antibacterial microcapsule, 28% of deionized water, 5% of emulsifier Sban 80, 1.5% of dispersant and 4% of additive.

3. The antibacterial microcapsule ink according to claim 2, characterized in that: The cosolvent is ethanol, the dispersant is polyacrylate, and the additive is one or more of a thickener, a leveling agent, a defoaming agent and a preservative.

4. The antibacterial microcapsule ink according to claim 2, characterized in that: The antibacterial microcapsules use chitosan as the wall material and cinnamon essential oil as the core material, and are prepared by a complex coacervation method to obtain a regular and uniform spherical structure.

5. The method for preparing the antibacterial microcapsule ink according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) Dissolve a certain amount of chitosan in 1% glacial acetic acid solution and disperse it by ultrasonic to form a transparent and clear chitosan solution; (2) Stirring Span 80 and cinnamon essential oil at room temperature to uniformly emulsify them to form a milky white liquid, adding the emulsified solution to the chitosan solution of step (1), and mixing by ultrasonication; (3) slowly adding a 4% sodium tripolyphosphate solution by mass to the mixed solution in step (2) to carry out an ionic crosslinking reaction, and freeze-drying after the reaction to obtain antibacterial microcapsules; (4) Add an appropriate amount of pigment, dispersant and deionized water into a container and stir until uniformly moistened, then add a cosolvent and continue stirring to form a slurry; then add a certain amount of water-based acrylic resin into the above slurry and stir until mixed, then add the antibacterial microcapsules prepared in step (3), Span 80 and additives, and homogenize to obtain ink.

6. The preparation method according to claim 5, characterized in that The mass volume ratio of chitosan to glacial acetic acid solution in step (1) is (0.16-0.20): (80-120).

7. The preparation method according to claim 5, characterized in that The mass ratio of Span 80, cinnamon essential oil and sodium tripolyphosphate solution is (0.34-0.40):(0.38-0.42):(0.8-1). In step (2), the stirring speed is 500-1500 rpm and the time is 2-4 hours; the ultrasonic time is 40-60 minutes; and in step (3), the freezing time is 24-48 hours.

8. The preparation method according to claim 5, characterized in that In step (4), the dispersant is a polyacrylate, and the addition amount is 1% to 2%; the addition amount of deionized water is 25% to 30%; the addition amount of pigment is 10% to 25%; the addition amount of cosolvent is ethanol, and the addition amount is 5% to 8%; the addition amount of water-based acrylic resin is 30% to 35%; the addition amount of antibacterial microcapsules is 10% to 15%; and the additives include thickeners, leveling agents, defoaming agents or preservatives, and the addition amount is 2% to 4%.

9. Use of the antibacterial microcapsule ink according to any one of claims 1 to 4 in printing on cigarette packaging boxes.

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