CN111777884B - Antibacterial smart card and manufacturing method thereof - Google Patents

Antibacterial smart card and manufacturing method thereof Download PDF

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Publication number
CN111777884B
CN111777884B CN202010604401.3A CN202010604401A CN111777884B CN 111777884 B CN111777884 B CN 111777884B CN 202010604401 A CN202010604401 A CN 202010604401A CN 111777884 B CN111777884 B CN 111777884B
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antibacterial
coating
oil
card
weight
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CN111777884A (en
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卢勇
吴思强
杨广新
徐小斌
易琴
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Jinbangda Co ltd
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Jinbangda Co ltd
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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
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/14—Paints containing biocides, e.g. fungicides, insecticides or pesticides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
    • B01J13/02—Making microcapsules or microballoons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
    • B01J13/02—Making microcapsules or microballoons
    • B01J13/06—Making microcapsules or microballoons by phase separation
    • B01J13/14—Polymerisation; cross-linking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
    • B01J13/02—Making microcapsules or microballoons
    • B01J13/20—After-treatment of capsule walls, e.g. hardening
    • B01J13/206—Hardening; drying
    • 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
    • C09D105/00—Coating compositions based on polysaccharides or on their derivatives, not provided for in groups C09D101/00 or C09D103/00

Abstract

The invention relates to the technical field of smart cards, in particular to an antibacterial smart card and a manufacturing method thereof. The antibacterial coating on the surface of the intelligent card has a slow-release microcapsule structure, the antibacterial effective period can reach 30 days, and the whole card preparation period from card output to delivery of a user can be basically covered, so that multiple disinfection in each link of card circulation is avoided.

Description

Antibacterial smart card and manufacturing method thereof
Technical Field
The invention relates to the technical field of intelligent cards, in particular to an antibacterial intelligent card and a manufacturing method thereof.
Background
The smart card is subjected to a standby card period of about one month, which is produced from the card manufacturer and delivered to the bank before being delivered to the user, and then the bank performs distribution, wherein the standby card period involves multiple hands-on and hand-over of the card, and the card may be attached with pathogenic bacteria and viruses before being delivered to the user. Card manufacturers and banks as manufacturers and issuers of smart cards need to ensure that the cards are in a sterile state before being delivered to users, so that the use safety of the users is guaranteed.
Currently, various industries pay attention to the antibacterial performance of products, and various antibacterial materials are widely applied. At present, most of the antibacterial materials are photocatalyst materials, and products adopting the photocatalyst materials can inhibit bacteria for a long time, but the antibacterial materials can exert antibacterial performance only by being excited by ultraviolet rays. The smart card is in a laminated packaging state in the standby card period, and even if the photocatalyst material is used, the antibacterial effect is difficult to exert. Therefore, there is a need for a smart card with antibacterial capability during the card preparation period.
Disclosure of Invention
The first purpose of the invention is to provide an antibacterial smart card which has antibacterial capacity in the card standby period.
The second objective of the present invention is to provide a manufacturing method of the aforementioned antibacterial smart card.
In order to achieve the first purpose, the invention provides an antibacterial smart card which is characterized in that an antibacterial coating is arranged on the surface of the antibacterial smart card, the antibacterial coating comprises slow-release microcapsules, the slow-release microcapsules comprise an oil core and a capsule shell, the oil core comprises a biguanide antibacterial agent and antibacterial plant essential oil, and the capsule shell is a copolymer of methyl methacrylate and pentaerythritol tetraacrylate.
According to the scheme, the oil core of the microcapsule in the antibacterial coating contains a biguanide (PHMB) synthetic antibacterial agent and an antibacterial plant essential oil natural antibacterial agent, wherein the biguanide synthetic antibacterial agent has a wide bactericidal spectrum and low effect concentration, can be used for inhibiting bacteria for a long time, is colorless, tasteless, nontoxic, nonirritant to skin and safer than a monoguanidine antibacterial agent; the latter is a natural bacteriostatic component extracted from plants, and has safe use and fresh smell. The copolymer capsule skin of Methyl Methacrylate (MMA) and pentaerythritol tetraacrylate (PET4A) has certain barrier capacity to outside water and air, so that the antibacterial coating formed by the slow-release microcapsules can slowly release the oil core containing antibacterial ingredients, the antibacterial effective period can reach 30 days, the whole card preparation period from card production to delivery of a user can be basically covered, and multiple disinfection in each link of card circulation is avoided.
In a further embodiment, the biguanide antibacterial agent is at least one selected from the group consisting of polyhexamethylene biguanide hydrochloride and polyhexamethylene biguanide phosphate.
From the above, the above two biguanide antibacterial agents are common and have been widely verified for safety.
Further, the antibacterial plant essential oil is thyme oil, cajeput oil, eucalyptus oil, cinnamon oil or oregano oil.
Therefore, the five plant essential oils which have the most prominent sterilizing effect and are safe to use are recognized at present.
Further, the thickness of the antibacterial coating is 1 μm to 5 μm.
From the above, the antibacterial coating meeting the above thickness condition has long-lasting antibacterial ability of 30 days, and does not substantially change the appearance and physical properties of the card.
In order to achieve the second object, the invention provides a method for preparing an antibacterial smart card, which is characterized by comprising the following steps:
a. adding 10-15 parts by weight of Arabic gum into 125-200 parts by weight of sterile distilled water, and stirring and dissolving at normal temperature to obtain a water phase;
b. mixing 1 to 4 parts by weight of biguanide antibacterial agent, 12 to 25 parts by weight of antibacterial plant essential oil, 12 to 25 parts by weight of n-octadecane, 25 to 50 parts by weight of methyl methacrylate, 25 to 50 parts by weight of pentaerythritol tetraacrylate and 50 to 100 parts by weight of cyclohexanone, stirring and dissolving at normal temperature to obtain an oil phase, wherein the biguanide antibacterial agent is at least one selected from polyhexamethylene biguanide hydrochloride and polyhexamethylene biguanide phosphate, and the antibacterial plant essential oil is thyme oil, cajeput oil, eucalyptus oil, cinnamon oil or oregano oil;
c. mixing the water phase and the oil phase at normal temperature, emulsifying and homogenizing at the rotating speed of 1500r/min to 2000r/min, heating to 50 ℃, carrying out cross-linking polymerization at the rotating speed of 500r/min to 1000r/min, and cooling to room temperature to obtain the microcapsule antibacterial coating;
d. 10ml/m on both sides of the laminated card blank2To 15ml/m2Uniformly coating microcapsule antibacterial coating, and naturally air-drying to obtain a coating card blank;
e. and cutting the coating card blank according to a preset size specification.
According to the scheme, the n-octadecane is used for dissolving the biguanide antibacterial agent and the antibacterial plant essential oil in the oil phase, the cyclohexanone is used for dissolving the methyl methacrylate and the pentaerythritol tetraacrylate, and the Arabic gum is used as an emulsifier in the system.
In the step c, the oil phase can be fully broken into oil drops with uniform sizes in a short time by using the emulsification homogenization effect of normal-temperature high-speed stirring, the oil drops can be naturally layered due to the difference of the density and the water solubility of the two solvents, methyl methacrylate and pentaerythritol tetraacrylate are positioned on the outer layer of the oil drops, and the n-octadecane, thyme oil and polyhexamethylene biguanide hydrochloride form an oil core on the inner layer of the oil drops. And c, in the heating and decelerating stirring process in the step c, the dispersed state of the oil drops can be maintained, and the methyl methacrylate and pentaerythritol tetraacrylate on the outer layer of the oil drops can be promoted to be crosslinked and polymerized into the capsule shell at a higher temperature. And d, gradually removing the water and cyclohexanone solvent from the coating in the natural air drying process in the step d, gradually solidifying and shaping the capsule shell of the microcapsule, and finally changing the coating into a dry antibacterial coating with a slow-release microcapsule structure. After the antibacterial coating completely loses efficacy, the slow-release microcapsules in the antibacterial coating are depleted, residues are few, and a new antibacterial coating can be arranged on the surface of the card after simple treatment.
The further proposal is that the time length of the emulsification and homogenization treatment in the step c is 15min to 20 min.
Therefore, the time length of the emulsification and homogenization treatment in the step c is controlled in the above range, so that the oil phase can be fully dispersed, and oil drops with ideal particle size range and uniform size can be obtained.
Further, the time for the cross-linking polymerization treatment in the step c is 3 hours.
Therefore, the cross-linking polymerization treatment time in the step c reaches 3 hours, so that the methyl methacrylate and the pentaerythritol tetraacrylate can be fully reacted.
And the further scheme is that in the step d, a spraying device is utilized to coat the microcapsule antibacterial coating on two surfaces of the laminated card blank.
Therefore, the spraying mode is convenient for controlling the using amount of the coating and has higher coating efficiency.
Further, the aperture of the spray head of the spraying equipment is 50-80 μm.
Therefore, the smaller the pore diameter of the nozzle corresponds to the smaller diameter of the coating liquid drop, the smaller the number of the microcapsules contained, and the more uniform the distribution of the microcapsules in the antibacterial coating can be ensured on the premise of ensuring the uniform spraying of the coating.
Further, the spraying equipment is an ULV spraying machine.
Therefore, the ULV (ultra Low volume) spraying machine can spray liquid drops with the diameter of less than 100 microns, and the liquid drops are thinner than liquid drops sprayed by common spraying equipment, so that the uniform distribution of microcapsules in the antibacterial coating is facilitated, the utilization rate of the coating is improved, and the loss is reduced.
Detailed Description
The invention manufactures the antibacterial intelligent card according to the following steps:
a. adding 10-15 parts by weight of Arabic gum into 125-200 parts by weight of sterile distilled water, and stirring and dissolving at normal temperature to obtain a water phase;
b. mixing 1 to 4 parts by weight of biguanide antibacterial agent, 12 to 25 parts by weight of antibacterial plant essential oil, 12 to 25 parts by weight of n-octadecane, 25 to 50 parts by weight of methyl methacrylate, 25 to 50 parts by weight of pentaerythritol tetraacrylate and 50 to 100 parts by weight of cyclohexanone, stirring and dissolving at normal temperature to obtain an oil phase, wherein the biguanide antibacterial agent is at least one selected from polyhexamethylene biguanide hydrochloride and polyhexamethylene biguanide phosphate, and the antibacterial plant essential oil is thyme oil, cajeput oil, eucalyptus oil, cinnamon oil or oregano oil;
c. mixing the water phase and the oil phase at normal temperature, emulsifying and homogenizing at the rotating speed of 1500r/min to 2000r/min, heating to 50 ℃, carrying out cross-linking polymerization at the rotating speed of 500r/min to 1000r/min, and cooling to room temperature to obtain the microcapsule antibacterial coating;
d. 10ml/m on both sides of the laminated card blank2To 15ml/m2Uniformly coating microcapsule antibacterial coating, and naturally air-drying to obtain a coating card blank;
e. and cutting the coating card blank according to a preset size specification.
The following embodiments specifically describe the manufacturing method of the above-mentioned antibacterial smart card, and the following embodiments all adopt the laminated card blanks for manufacturing the smart cards in the same batch, the laminated card blanks are of a conventional five-layer structure, and include a front-surface film-covered layer, a front-surface printing layer, an Inlay layer, a back-surface printing layer and a back-surface film-covered layer, and the microcapsule antibacterial paint is coated on the surfaces of the front-surface film-covered layer and the back-surface film-covered layer.
Example one
The embodiment provides a manufacturing method of an antibacterial smart card, which comprises the following steps:
a. adding 50g of Arabic gum powder into 750g of sterile distilled water, and stirring and dissolving at normal temperature to obtain a water phase;
b. mixing 10g of polyhexamethylene biguanide hydrochloride powder, 60g of thyme oil, 100g of n-octadecane, 125g of methyl methacrylate, 150g of pentaerythritol tetraacrylate and 250g of cyclohexanone, and stirring and dissolving at normal temperature to obtain an oil phase;
c. mixing the water phase and the oil phase at normal temperature, emulsifying and homogenizing for 18min at the rotating speed of 1500r/min by using a high-speed dispersion homogenizer, then heating to 50 ℃ under the condition of water bath, keeping the temperature constant, carrying out cross-linking polymerization for 3h at the rotating speed of 800r/min by matching with the high-speed dispersion homogenizer, and cooling to room temperature to obtain the microcapsule antibacterial coating;
d. 12ml/m of ULV cold spray coating machine with nozzle aperture of 50-80 μm is used for two sides of laminated card blank2The microcapsule antibacterial coating is sprayed according to the using amount of the raw materials, then the raw materials are naturally dried to obtain a coating blocking blank, and the thickness of two antibacterial coatings formed by the microcapsule antibacterial coating on the coating blocking blank is measured to be within the range of 1-5 mu m;
e. and cutting the coating card blank according to a preset size specification to obtain the antibacterial intelligent card.
Example two
The embodiment provides a manufacturing method of an antibacterial smart card, which comprises the following steps:
a. putting 60g of Arabic gum powder into 625g of sterile distilled water, and stirring and dissolving at normal temperature to obtain a water phase;
b. mixing 5g of polyhexamethylene biguanide phosphate powder, 75g of cajeput oil, 60g of n-octadecane, 150g of methyl methacrylate, 125g of pentaerythritol tetraacrylate and 350g of cyclohexanone, and stirring and dissolving at normal temperature to obtain an oil phase;
c. mixing the water phase and the oil phase at normal temperature, emulsifying and homogenizing for 20min at the rotating speed of 1800r/min by using a high-speed dispersion homogenizer, then heating to 50 ℃ under the condition of water bath, keeping the temperature constant, carrying out cross-linking polymerization for 3h at the rotating speed of 500r/min by matching with the high-speed dispersion homogenizer, and cooling to room temperature to obtain the microcapsule antibacterial coating;
d. using ULV cold spray coating machine with nozzle aperture of 50-80 μm to coat the two sides of the laminated card blank at a ratio of 14ml/m2The microcapsule antibacterial coating is sprayed according to the using amount of the raw materials, then the raw materials are naturally dried to obtain a coating blocking blank, and the thickness of two antibacterial coatings formed by the microcapsule antibacterial coating on the coating blocking blank is measured to be within the range of 1-5 mu m;
e. and cutting the coating card blank according to a preset size specification to obtain the antibacterial intelligent card.
EXAMPLE III
The embodiment provides a manufacturing method of an antibacterial smart card, which comprises the following steps:
a. putting 75g of Arabic gum powder into 900g of sterile distilled water, and stirring and dissolving at normal temperature to obtain a water phase;
b. mixing 10g of polyhexamethylene biguanide hydrochloride powder, 5g of polyhexamethylene biguanide phosphate powder, 100g of eucalyptus oil, 75g of n-octadecane, 200g of methyl methacrylate, 200g of pentaerythritol tetraacrylate and 450g of cyclohexanone, and stirring and dissolving at normal temperature to obtain an oil phase;
c. mixing the water phase and the oil phase at normal temperature, emulsifying and homogenizing for 15min at the rotating speed of 2000r/min by using a high-speed dispersion homogenizer, then heating to 50 ℃ under the condition of water bath, keeping the temperature constant, carrying out cross-linking polymerization for 3h at the rotating speed of 700r/min by matching with the high-speed dispersion homogenizer, and cooling to room temperature to obtain the microcapsule antibacterial coating;
d. using ULV cold spray coating machine with nozzle aperture of 50-80 μm to coat the two sides of the laminated card blank at a ratio of 10ml/m2The amount of the microcapsule antibacterial coating is sprayed and then naturally driedObtaining a coating blocking blank, and measuring the thickness of two antibacterial coatings formed by the microcapsule antibacterial coating on the coating blocking blank to be in the range of 1-5 mu m;
e. and cutting the coating card blank according to a preset size specification to obtain the antibacterial intelligent card.
Example four
The embodiment provides a manufacturing method of an antibacterial smart card, which comprises the following steps:
a. adding 65g of Arabic gum powder into 1000g of sterile distilled water, and stirring and dissolving at normal temperature to obtain a water phase;
b. mixing 20g of polyhexamethylene biguanide phosphate powder, 115g of cinnamon oil, 110g of n-octadecane, 250g of methyl methacrylate, 250g of pentaerythritol tetraacrylate and 500g of cyclohexanone, and stirring and dissolving at normal temperature to obtain an oil phase;
c. mixing the water phase and the oil phase at normal temperature, emulsifying and homogenizing for 19min at the rotating speed of 1600r/min by using a high-speed dispersion homogenizer, then heating to 50 ℃ under the condition of water bath, keeping the temperature constant, carrying out cross-linking polymerization for 3h at the rotating speed of 1000r/min by matching with the high-speed dispersion homogenizer, and cooling to room temperature to obtain the microcapsule antibacterial coating;
d. using ULV cold spray coating machine with nozzle aperture of 50-80 μm to coat the two sides of the laminated card blank according to the volume ratio of 15ml/m2The microcapsule antibacterial coating is sprayed according to the using amount of the raw materials, then the raw materials are naturally dried to obtain a coating blocking blank, and the thickness of two antibacterial coatings formed by the microcapsule antibacterial coating on the coating blocking blank is measured to be within the range of 1-5 mu m;
e. and cutting the coating card blank according to a preset size specification to obtain the antibacterial intelligent card.
EXAMPLE five
The embodiment provides a manufacturing method of an antibacterial smart card, which comprises the following steps:
a. putting 70g of Arabic gum powder into 800g of sterile distilled water, and stirring and dissolving at normal temperature to obtain a water phase;
b. mixing 10g of polyhexamethylene biguanide hydrochloride powder, 10g of polyhexamethylene biguanide phosphate powder, 125g of oregano oil, 125g of n-octadecane, 225g of methyl methacrylate, 175g of pentaerythritol tetraacrylate and 300g of cyclohexanone, and stirring and dissolving at normal temperature to obtain an oil phase;
c. mixing the water phase and the oil phase at normal temperature, emulsifying and homogenizing for 17min at the rotating speed of 1700r/min by using a high-speed dispersion homogenizer, then heating to 50 ℃ under the condition of water bath, keeping the temperature constant, carrying out cross-linking polymerization for 3h at the rotating speed of 600r/min by matching with the high-speed dispersion homogenizer, and cooling to room temperature to obtain the microcapsule antibacterial coating;
d. using ULV cold spray coating machine with nozzle aperture of 50-80 μm to form 13ml/m on both sides of laminated card blank2The microcapsule antibacterial coating is sprayed according to the using amount of the raw materials, then the raw materials are naturally dried to obtain a coating blocking blank, and the thickness of two antibacterial coatings formed by the microcapsule antibacterial coating on the coating blocking blank is measured to be within the range of 1-5 mu m;
e. and cutting the coating card blank according to a preset size specification to obtain the antibacterial intelligent card.
Surface antibacterial property test
A surface antibacterial performance test is carried out according to GB/T31402-2015, considering that a national standard test sample is not cut according to the size of the intelligent card, small coating card blanks without division are reserved in five embodiments, small laminating card blanks are reserved in the first embodiment (the sources of the laminating card blanks in the five embodiments are the same, only one group is selected as a control), and the two types of card blanks are stored for 30 days under the same storage condition as the antibacterial intelligent card product and then are tested. The samples without antibacterial treatment are taken from the laminated card blanks in the first embodiment, the samples after antibacterial treatment are taken from the coated card blanks in the first to the fifth embodiments, the test strain is staphylococcus aureus ATCC 6538, and the average viable count of the immediately inoculated elution group is 11000CFU/cm2The average viable count of the sample group without antimicrobial treatment was 2800CFU/cm2The average viable count of the antibacterial treated sample group is 17CFU/cm2The result shows that the antibacterial smart card has obvious surface antibacterial performance within the expected antibacterial period of validity.

Claims (6)

1. A manufacturing method of an antibacterial smart card is characterized by comprising the following steps:
a. adding 10-15 parts by weight of Arabic gum into 125-200 parts by weight of sterile distilled water, and stirring and dissolving at normal temperature to obtain a water phase;
b. mixing 1-4 parts by weight of biguanide antibacterial agent, 12-25 parts by weight of antibacterial plant essential oil, 12-25 parts by weight of n-octadecane, 25-50 parts by weight of methyl methacrylate, 25-50 parts by weight of pentaerythritol tetraacrylate and 50-100 parts by weight of cyclohexanone, stirring and dissolving at normal temperature to obtain an oil phase, wherein the biguanide antibacterial agent is at least one selected from polyhexamethylene biguanide hydrochloride and polyhexamethylene biguanide phosphate, and the antibacterial plant essential oil is thyme oil, cajeput oil, eucalyptus oil, cinnamon oil or oregano oil;
c. mixing the water phase and the oil phase at normal temperature, emulsifying and homogenizing at the rotating speed of 1500r/min to 2000r/min, heating to 50 ℃, carrying out cross-linking polymerization at the rotating speed of 500r/min to 1000r/min, and cooling to room temperature to obtain the microcapsule antibacterial coating;
d. 10mL/m on both sides of the laminated card blank2To 15mL/m2Uniformly coating the microcapsule antibacterial coating, and then naturally drying to obtain a coating card blank;
e. and cutting the coating card blank according to a preset size specification.
2. The method of making an antimicrobial smart card of claim 1, wherein:
the time length of the emulsification and homogenization treatment in the step c is 15min to 20 min.
3. The method of making an antimicrobial smart card of claim 1, wherein:
the time length of the cross-linking polymerization treatment in the step c is 3 h.
4. The method for manufacturing an antibacterial smart card according to any one of claims 1 to 3, wherein:
and d, coating microcapsule antibacterial coating on two surfaces of the laminated card blank by using spraying equipment.
5. The method of making an antimicrobial smart card of claim 4, wherein:
the aperture of the spray head of the spraying equipment is 50-80 μm.
6. The method of making an antimicrobial smart card of claim 4, wherein:
the spraying equipment is an ultra-low-capacity sprayer.
CN202010604401.3A 2020-06-29 2020-06-29 Antibacterial smart card and manufacturing method thereof Active CN111777884B (en)

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