CN116024844A - Surface antibacterial treatment process of carton board - Google Patents
Surface antibacterial treatment process of carton board Download PDFInfo
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- CN116024844A CN116024844A CN202310292888.XA CN202310292888A CN116024844A CN 116024844 A CN116024844 A CN 116024844A CN 202310292888 A CN202310292888 A CN 202310292888A CN 116024844 A CN116024844 A CN 116024844A
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Abstract
The invention discloses a surface antibacterial treatment process of a carton board, which comprises the following steps of: (1) Pretreating at least one surface of the carton board by adopting a hot platen press method to enable the surface of the carton board to generate a tiny concave surface so as to form a tiny concave coating surface; (2) Oxidizing the micro-concave coating surface of the carton board to make the micro-concave coating surface hydrophilic; (3) Humidifying the slightly concave coating surface of the carton board; (4) carrying out micro-heat drying treatment on the carton board; (5) Coating an antibacterial coating on the slightly concave coating surface of the carton board; (6) And drying and curing the antibacterial coating on the surface of the carton board. The surface antibacterial treatment process of the carton board not only can keep the physical property and mechanical property of the carton board, but also has long-term antibacterial effect.
Description
Technical Field
The invention relates to the technical field of carton boards, in particular to a surface antibacterial treatment process of a carton board.
Background
Packaging cartons for packaging food are generally required to have antibacterial properties to ensure that the food is protected from bacterial attack during storage and transportation, and to ensure the safety of the food. At present, the most used antibacterial treatment is to put bagged antibacterial particles (such as camphora pellets) into a carton, but the bagged antibacterial particles have some problems in the use process: (1) The stability of the bagged antibacterial particles is insufficient, the use time is long, the antibacterial effect is weakened and even is invalid; (2) The bagged antibacterial particles can influence the physical properties and mechanical properties of the packaging cartons, and reduce the quality and bearing capacity of the cartons; (3) The environmental impact of the bagged antimicrobial particles is also considered, and if the bagged antimicrobial particles contain toxic components and cannot be effectively treated, the environmental pollution may be caused.
Disclosure of Invention
The invention aims to solve the problem of providing a surface antibacterial treatment process of a carton board, which can not only keep the physical property and the mechanical property of the carton board, but also have long-term antibacterial effect.
In order to solve the technical problems, the invention adopts the following technical scheme:
the surface antibacterial treatment process of the carton board is characterized by comprising the following steps of:
(1) Pretreating at least one surface of the carton board by adopting a hot platen press method to enable the surface of the carton board to generate a tiny concave surface so as to form a tiny concave coating surface;
(2) Oxidizing the micro-concave coating surface of the carton board to make the micro-concave coating surface hydrophilic;
(3) Humidifying the slightly concave coating surface of the carton board;
(4) Carrying out micro-thermal drying treatment on the carton board;
(5) Coating an antibacterial coating on the slightly concave coating surface of the carton board;
(6) And drying and curing the antibacterial coating on the surface of the carton board.
In the preferred scheme, in the step (1), the hot platen press method is to heat and press the carton board by a hot press, so that a tiny concave surface is generated on the surface of the carton board.
In a further preferred embodiment, in the step (1), the working conditions of the hot isostatic pressing method include: the temperature is controlled between 130 ℃ and 180 ℃; the humidity is kept between 50% and 70%; the pressure is between 2MPa and 6 MPa; the hot pressing time is between 10 seconds and 20 seconds. The temperature is 130-180 ℃, so that a certain tiny concave surface can be formed on the surface of the paperboard, and the physical property change caused by overheating can be prevented; keeping the humidity in the range of 50% -70%, which is helpful for the tiny concave surface formed after heating to be not easy to be filled up; the pressure is controlled between 2MPa and 6MPa, otherwise the effect of pretreatment is affected; the hot pressing time is between 10 seconds and 20 seconds, the formation of tiny concave surfaces is insufficient if the hot pressing time is too short, the treatment effect is poor, and the paper box plate can be influenced if the hot pressing time is too long.
In a preferred scheme, the step (2) is to oxidize the slightly concave coating surface of the carton board, and specifically comprises the following steps:
(2-1) cleaning: cleaning dirt and grease on the surface of the carton board to increase the effect of oxidation treatment;
(2-2) curtain coating: spraying a liquid containing an oxidant onto the micro-concave coated surface of the carton board to enable the micro-concave coated surface to activate the surface and promote oxidation reaction;
(2-3) reaction: standing for 5-10 seconds, and reacting the oxidant on the slightly concave coating surface subjected to curtain coating to enable the slightly concave coating surface to open more active groups;
(2-4) residue removal: ultrasonic waves are used to remove the remaining oxidizing agent and reactants.
In a further preferred embodiment, the liquid containing the oxidizing agent in the step (2-2) is one of a potassium permanganate solution, a hydrogen peroxide solution or a nitric acid solution.
In the preferred scheme, in the step (3), before the humidifying treatment is performed on the micro-concave coating surface of the carton board, the micro-concave coating surface of the carton board is subjected to atomization antibacterial pretreatment. The atomization antibacterial pretreatment is to atomize the antibacterial agent into hundreds of millions of ultrafine nano antibacterial particles through an atomization device, so that the ultrafine nano antibacterial particles can effectively kill bacteria and mold in the air and attached to a carton board.
In a preferred embodiment, the humidifying treatment is performed in the step (3) by a wet heat treatment method.
In a further preferred embodiment, the wet heat treatment mode in the step (3) specifically includes the following steps:
(3-1) placing the carton board into a steam drying oven;
(3-2) introducing steam and natural wind into a steam drying box, and controlling the temperature to be 50-60 ℃;
(3-3) heating for 15 seconds to 30 seconds.
In the process of the damp-heat treatment, the carton board is completely in steam, and the steam is introduced into the surface of the carton board, so that the surface of paper is moistened, the moisture distribution on the surface of the carton board is changed, the surface structure of the carton board is changed, and the adhesive property of the carton board is improved.
In the preferred scheme, the micro-heat drying treatment in the step (4) adopts a hot air drying mode, and the temperature of hot air is controlled between 50 ℃ and 60 ℃.
Preferably, in the step (5), the antibacterial coating is one of a chemical coating, a physical coating or a biological coating or a combination thereof.
In a further preferred embodiment, in the step (5), the antibacterial coating layer is a chemical coating layer, and the compound solution or paint with antibacterial function is applied to the dimple coating surface by spraying or brushing to form the antibacterial coating layer.
In a further preferred embodiment, the antibacterial coating in the step (5) is made of a material comprising Ag ＋ Is a coating of (a).
In a still further preferred embodiment, the antibacterial coating in the step (5) is made of a material comprising Ag ＋ And Cu ＋ /Cu 2＋ Is a coating of (a).
In a still further preferred embodiment, the antibacterial coating in the step (5) comprises the following components in weight ratio: 20-30 parts of nano silver particles, 20-30 parts of nano copper particles, 10-20 parts of nano titanium dioxide particles, 10-20 parts of gelatin, 100-200 parts of aqueous polyurethane and 50-80 parts of water.
Ag ＋ Has strong antibacterial effect. The antibacterial effect of the nano silver particles is mainly that bacterial membrane layers and DNA molecular structures are destroyed, so that abnormal cell metabolism and cell death are caused, and the antibacterial effect is exerted. Wherein Ag is ＋ The induction of Reactive Oxygen Species (ROS) after binding to bacterial cell walls is also an important factor in inhibiting bacteria.
The advantage of Cu as an antimicrobial agent is that Cu is more chemically active than Ag in a dry indoor environment. Cu has strong chemical activity, can rapidly kill a large amount of fungi, bacteria and viruses, and is an environment-friendly sustainable antibacterial agent. Oxidation of the above-mentioned nano copper particles to Cu ＋ /Cu 2＋ ，Cu ＋ /Cu 2＋ Free radicals can be generated by Fenton-like catalytic reactions, which can attack the membranes and internal structures of bacteria, leading to cell death. Furthermore, cu ＋ /Cu 2＋ But also to hinder the exchange of cells with other ions, thereby further killing the bacteria. Thereby Ag is processed ＋ And Cu ＋ /Cu 2＋ Combined use can result in betterCan inhibit the growth and reproduction of bacteria more effectively. Because of Ag ＋ And Cu ＋ /Cu 2＋ The two ions have different mechanisms for exerting bacteriostatic action, and meanwhile, the bacteriostatic effect of the two ions is overlapped and complemented.
The above-mentioned nano titanium dioxide particles as a metal oxide, when irradiated with natural light of a specific wavelength, excite electron-hole pairs and have a strong redox ability, and generate active oxygen species having a strong redox property, such as hydroxyl radicals (OH) and the like. The active oxygen substances can destroy the structures of cell walls, membranous layers, cytoplasms and the like of bacteria, kill the bacteria and decompose silk screen thalli of the bacteria, thereby achieving the effect of inhibiting the growth and the reproduction of the bacteria.
The gelatin is a natural food additive, has good antibacterial performance and stability, and the stability and the reliability of the coating can be improved by adding a certain amount of gelatin into the coating, and meanwhile, the gelatin does not harm human bodies. The gelatin fixes various nano materials on the surface of the carton board to form a uniform antibacterial coating, so that the hardness and the wear resistance of the antibacterial coating can be improved.
The aqueous polyurethane can form a protective layer to prevent the antibacterial coating from being damaged by water and corrosion.
In a preferred embodiment, in the step (6), after the antimicrobial coating is coated on the dimple coated surface of the cardboard box, the cardboard box is placed in a radiation area of a radiation device, and the appropriate irradiation time and energy are adjusted to irradiate the antimicrobial coating with electromagnetic waves. After the antibacterial coating is irradiated by electromagnetic waves, the antibacterial coating has the following beneficial effects: (1) improving the sterilization capability: the cell membrane and the cell wall of the thalli can be destroyed by the irradiation of electromagnetic waves, so that bacteria and viruses are killed; (2) the sterilization speed is increased: the irradiation time of electromagnetic waves is short, the effect is quick, and the sterilization speed of the antibacterial coating can be effectively accelerated; (3) enhancing the reliability of the antimicrobial coating: the antibacterial coating prepared by electromagnetic wave irradiation has more stable sterilization effect and longer retention time, and has better antibacterial performance; (4) reducing the risk of contamination: after the antibacterial coating is irradiated by electromagnetic waves, the amount of the residual antibacterial agent in the coating can be reduced, and the pollution risk to the environment and human body is reduced.
In a preferred scheme, the method further comprises a step (7) of coating a layer of water repellent agent on the antibacterial coating. More preferably, the water repellent agent is uniformly coated on the antibacterial coating in the step (6) by spraying or rolling coating, and dried by a dryer. The water repellent agent is a water repellent agent containing wax components, has resistance to permeation of a plurality of liquids, can also form a good water-resistant lotus leaf effect, and does not change the porosity, flexibility, air permeability, appearance and wet strength of the carton board. And a layer of water repellent agent is coated on the surface of the carton board, so that the surface of the carton board can resist water.
Compared with the prior art, the invention has the following advantages:
before the antibacterial coating is coated, a series of treatments are carried out on the surface of the carton board by adopting the steps (1) - (4), and the adhesive force of the surface of the carton board is greatly enhanced on the premise of keeping the original structural strength of the carton board and the physical and mechanical properties of the carton board, so that the antibacterial coating partially permeates into the surface layer of the carton board on the basis of greatly reducing the thickness of the antibacterial coating, and after the carton board is placed or rubbed for a long time, the effective antibacterial coating is still kept on the surface of the carton board; in addition, the adopted manufacturing mode is simple, convenient and feasible, is suitable for large-scale production, and has relatively low cost. The method comprises the following steps of (1) pretreating by a hot platen press method to enable the surface of a carton board to generate a tiny concave surface so as to form a tiny concave coating surface, and increasing the adhesive force of an antibacterial coating on the surface of the carton board; step (2) carrying out oxidation treatment on the micro-concave coating surface to ensure that the micro-concave coating surface has certain hydrophilicity, and enhancing the covering power and adhesive force of the antibacterial coating on the micro-concave coating surface; step (3) humidifying the micro-concave coating surface of the carton board to uniformly distribute water on the micro-concave coating surface so as to increase the humidity of the micro-concave coating surface; and (4) carrying out micro-thermal drying treatment on the carton board to remove the moisture on the micro-concave coating surface, but retaining the moisture of the paperboard which has permeated into the micro-concave coating surface, so that the antibacterial coating is easier to permeate into the surface layer of the carton board.
Description of the embodiments
The present invention will be specifically described with reference to the following examples.
The surface antibacterial treatment process of the carton board in the embodiment comprises the following steps:
(1) Pretreating at least one surface of the carton board by adopting a hot platen press method to enable the surface of the carton board to generate a tiny concave surface so as to form a tiny concave coating surface;
(2) Oxidizing the micro-concave coating surface of the carton board to make the micro-concave coating surface hydrophilic;
(3) Humidifying the slightly concave coating surface of the carton board;
(4) Carrying out micro-thermal drying treatment on the carton board;
(5) Coating an antibacterial coating on the slightly concave coating surface of the carton board;
(6) And drying and curing the antibacterial coating on the surface of the carton board.
In the step (1), the hot platen press method is to heat and press the carton board by a hot press, so that a tiny concave surface is generated on the surface of the carton board.
In the step (1), the working conditions of the hot isostatic pressing method comprise: the temperature is controlled between 130 ℃ and 180 ℃; the humidity is kept between 50% and 70%; the pressure is between 2MPa and 6 MPa; the hot pressing time is between 10 seconds and 20 seconds.
And (2) oxidizing the slightly concave coating surface of the carton board, which comprises the following steps:
(2-1) cleaning: cleaning dirt and grease on the surface of the carton board to increase the effect of oxidation treatment;
(2-2) curtain coating: spraying a liquid containing an oxidant onto the micro-concave coated surface of the carton board to enable the micro-concave coated surface to activate the surface and promote oxidation reaction;
(2-3) reaction: standing for 5-10 seconds, and reacting the oxidant on the slightly concave coating surface subjected to curtain coating to enable the slightly concave coating surface to open more active groups;
(2-4) residue removal: ultrasonic waves are used to remove the remaining oxidizing agent and reactants.
The liquid containing the oxidant in the step (2-2) is potassium permanganate solution.
In the step (3), before humidifying treatment is carried out on the micro-concave coating surface of the carton board, atomization antibacterial pretreatment is carried out on the micro-concave coating surface of the carton board. The atomization antibacterial pretreatment is to atomize the antibacterial agent into hundreds of millions of ultrafine nano antibacterial particles through an atomization device, so that the ultrafine nano antibacterial particles can effectively kill bacteria and mold in the air and attached to a carton board.
In the step (3), humidification treatment is performed by a wet heat treatment mode, and the wet heat treatment mode specifically comprises the following steps:
(3-1) placing the carton board into a steam drying oven;
(3-2) introducing steam and natural wind into a steam drying box, and controlling the temperature between 50 ℃;
(3-3) heating for 15 seconds.
In the process of the damp-heat treatment, the carton board is completely in steam, and the steam is introduced into the surface of the carton board, so that the surface of paper is moistened, the moisture distribution on the surface of the carton board is changed, the surface structure of the carton board is changed, and the adhesive property of the carton board is improved.
The micro-heat drying treatment in the step (4) adopts a hot air drying mode, and the temperature of hot air is controlled between 50 ℃.
In the step (5), the antibacterial coating adopts a chemical coating, and a compound solution or paint with an antibacterial function is coated on the micro-concave coating surface in a spraying or brushing mode to form the antibacterial coating.
The antibacterial coating in the step (5) comprises Ag ＋ And Cu ＋ /Cu 2＋ Is a coating of (a).
The antibacterial coating in the step (5) comprises the following components in parts by weight: 20 parts of nano silver particles, 25 parts of nano copper particles, 10 parts of nano titanium dioxide particles, 10 parts of gelatin, 120 parts of aqueous polyurethane and 50 parts of water.
In the step (6), after the antibacterial coating is coated on the slightly concave coating surface of the carton board, the carton board is placed in a radiation area of a radiation device, proper radiation time and energy are regulated, and electromagnetic wave radiation is carried out on the antibacterial coating.
The embodiment also comprises a step (7) of uniformly coating the antibacterial coating in the step (6) with a water repellent agent by spraying or rolling coating, and drying by a dryer.
And (3) carrying out antibacterial performance test on the carton board subjected to the surface antibacterial treatment. The test conditions and test environments were as follows:
in an environment with a test temperature of 25 ℃ and a relative humidity of 60% RH, preparing an escherichia coli solution with a concentration of 0.1%, and coating the escherichia coli solution on a carton board, so that the contact time of the carton board and the escherichia coli solution is 0min, 15min, 30min, 60min and 120min. The test results express the antibacterial effect of the antibacterial coating on the carton board by the antibacterial rate, and can be compared by calculating and obtaining antibacterial rate results under the conditions of the same antibacterial substance treatment concentration and different contact time. The test results are shown in table 1 below.
Table 1: results of bacteriostasis test under different contact time conditions
From the test results of table 1, it can be derived:
when the contact time of the carton board without the antibacterial coating and the escherichia coli solution is 0, the antibacterial rate is 0;
when the concentration of the escherichia coli solution is 0.1%, the antibacterial rate of the carton board subjected to the surface antibacterial treatment on escherichia coli is gradually improved; after 60min of contact, the antibacterial rate reaches 80%; after 120min, the bacteriostasis rate can reach 90 percent. Therefore, the carton board subjected to the surface antibacterial treatment can maintain the physical properties and mechanical properties of the carton board and has long-term antibacterial effect.
The carton board in the background art (namely, the carton with the bagged antibacterial particles) and the carton board subjected to the surface antibacterial treatment are subjected to antibacterial test. The method comprises the steps of preparing escherichia coli solution with the same concentration, coating the same amount of escherichia coli solution on two carton boards, and periodically sampling and comparing colony numerical differences between the two carton boards to calculate the antibacterial rate, so that the comparison result of the antibacterial performance is obtained.
In the following, 10mL of 0.1% E.coli solution was coated on the surfaces of both carton boards, and after standing for 120 minutes, the number of E.coli was observed, and the antibacterial ratio was calculated for comparison. The test results are shown in table 2 below.
Table 2: antibacterial rate test result of two different carton boards
As can be seen from the test results in table 2, compared with the carton board in the background art, the number of bacteria on the surface of the carton board subjected to the surface antibacterial treatment in this embodiment is significantly reduced, and a better antibacterial effect is obtained. Therefore, the carton manufactured by the carton board subjected to the surface antibacterial treatment also has a certain antibacterial effect, and can effectively prevent bacteria from breeding and reproducing.
In addition, it should be noted that, in the specific embodiments described in the present specification, names of various parts and the like may be different, and all equivalent or simple changes of the structures, features and principles described in the conception of the present invention are included in the protection scope of the present invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions in a similar manner without departing from the scope of the invention as defined in the accompanying claims.
Claims (10)
1. The surface antibacterial treatment process of the carton board is characterized by comprising the following steps of:
(1) Pretreating at least one surface of the carton board by adopting a hot platen press method to enable the surface of the carton board to generate a tiny concave surface so as to form a tiny concave coating surface;
(2) Oxidizing the micro-concave coating surface of the carton board to make the micro-concave coating surface hydrophilic;
(3) Humidifying the slightly concave coating surface of the carton board;
(4) Carrying out micro-thermal drying treatment on the carton board;
(5) Coating an antibacterial coating on the slightly concave coating surface of the carton board;
(6) And drying and curing the antibacterial coating on the surface of the carton board.
2. The surface antimicrobial treatment process of a carton board as claimed in claim 1, wherein:
in the step (1), the hot platen press method is to heat and press the carton board by a hot press so as to generate tiny concave surfaces on the surface of the carton board;
in the step (1), the working conditions of the hot isostatic pressing method include: the temperature is controlled between 130 ℃ and 180 ℃; the humidity is kept between 50% and 70%; the pressure is between 2MPa and 6 MPa; the hot pressing time is between 10 seconds and 20 seconds.
3. The surface antimicrobial treatment process of a carton board as claimed in claim 1, wherein: the step (2) is to oxidize the slightly concave coating surface of the carton board, and specifically comprises the following steps:
(2-1) cleaning: cleaning dirt and grease on the surface of the carton board to increase the effect of oxidation treatment;
(2-2) curtain coating: spraying a liquid containing an oxidant onto the micro-concave coated surface of the carton board to enable the micro-concave coated surface to activate the surface and promote oxidation reaction;
(2-3) reaction: standing for 5-10 seconds, and reacting the oxidant on the slightly concave coating surface subjected to curtain coating to enable the slightly concave coating surface to open more active groups;
(2-4) residue removal: ultrasonic waves are used to remove the remaining oxidizing agent and reactants.
4. The surface antimicrobial treatment process of a carton board as claimed in claim 1, wherein:
in the step (3), before humidifying treatment is carried out on the micro-concave coating surface of the carton board, atomization antibacterial pretreatment is carried out on the micro-concave coating surface of the carton board;
in the step (6), after the antibacterial coating is coated on the slightly concave coating surface of the carton board, the carton board is placed in a radiation area of a radiation device, proper radiation time and energy are regulated, and electromagnetic wave radiation is carried out on the antibacterial coating.
5. The surface antimicrobial treatment process of a carton board as claimed in claim 1, wherein: in the step (3), humidification treatment is performed by a wet heat treatment mode, and the wet heat treatment mode specifically comprises the following steps:
(3-1) placing the carton board into a steam drying oven;
(3-2) introducing steam and natural wind into a steam drying box, and controlling the temperature to be 50-60 ℃;
(3-3) heating for 15 seconds to 30 seconds.
6. The surface antimicrobial treatment process of a carton board as claimed in claim 1, wherein: in the step (5), the antibacterial coating adopts one of a chemical coating, a physical coating or a biological coating or a combination thereof.
7. The surface antimicrobial treatment process of the carton board as claimed in claim 6, wherein: in the step (5), the antibacterial coating adopts a chemical coating, and a compound solution or paint with an antibacterial function is coated on the dimple coating surface in a spraying or brushing mode to form the antibacterial coating.
8. The surface antimicrobial treatment process of a carton board as claimed in claim 7, wherein: the antibacterial coating in the step (5) adopts a coating containing Ag ＋ Is a coating of (a).
9. The surface antibacterial treatment process of a carton board as claimed in claim 8, which comprises the following steps ofIs characterized in that: the antibacterial coating in the step (5) adopts a coating containing Ag ＋ And Cu ＋ /Cu 2＋ Is a coating of (a).
10. The surface antimicrobial treatment process of a carton board as claimed in claim 9, wherein: the antibacterial coating in the step (5) comprises the following components in parts by weight: 20-30 parts of nano silver particles, 20-30 parts of nano copper particles, 10-20 parts of nano titanium dioxide particles, 10-20 parts of gelatin, 100-200 parts of aqueous polyurethane and 50-80 parts of water.
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| CN109853300A (en) * | 2019-03-13 | 2019-06-07 | 广州益峰尖纸制品有限公司 | A kind of mould proof processing coating of printing packaging paper and preparation method thereof |
| CN111021138A (en) * | 2019-11-04 | 2020-04-17 | 昆山上悦标签新材料有限公司 | Water replenishing method in coating process of paper coating machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08151037A (en) * | 1994-11-29 | 1996-06-11 | Shinagawa Fuel Co Ltd | Antibacterially processed corrugated cardboard case and method for antibacterial processing thereof |
| CN107447592A (en) * | 2017-08-24 | 2017-12-08 | 力嘉包装（东莞）有限公司 | A kind of hydrophobic antimicrobial agent and hydrophobic antimicrobial enhancing corrugated board and preparation method for corrugated board |
| CN109322213A (en) * | 2018-08-28 | 2019-02-12 | 扬中市惠丰包装有限公司 | A kind of processing method of the cartons with preserving fruit and vegetable utilizing function |
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