JP2017205685A - Manufacturing method of antibacterial and deodorant film, antibacterial and deodorant film and packaging material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of an antibacterial and deodorant film, the antibacterial and deodorant film and packaging material capable of improving carrying capacity of antibacterial and deodorant material and capable of persistently retaining antibacterial and deodorant performance.SOLUTION: A manufacturing method of an antibacterial and deodorant film includes: a process of applying first coating liquid 3' which contains foam microcapsule 2 and binder onto base material 1; a process of performing first drying processing to the first coating liquid 3' applied onto the base material 1 and foaming the foam microcapsule 2 to form a resin layer 3 which has a fine rugged structure produced by foaming on a surface thereof; a process of applying second coating liquid 6 which contains antibacterial and deodorant material 7 and does not contain binder onto a surface of the resin layer 3 and introducing the antibacterial and deodorant material 7 into a recessed part 5 of the rugged structure; and a process of performing second drying processing to the second coating liquid 6 applied onto the surface of the resin layer 3 and fixing the antibacterial and deodorant material 7 to an inner surface of the recessed part 5.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for producing an antibacterial deodorant film, an antibacterial deodorant film, and a packaging material.

Many antibacterial products have been commercialized for toiletries and cooking utensils. In recent years, the demand for antibacterial and deodorant products having a deodorizing function has increased due to the recent increase in safety and health orientation. In fact, antibacterial deodorant products are on the market in socks, underwear, and suits in the clothing field, and antibacterial deodorant products are also found in other shoes and bedding. Recently, in the field of living environment, wallpaper and printed decorative sheets having antibacterial and deodorizing functions have been demanded.
As a method of imparting functions to these products, in clothing and bedding, it is fixed by fixing the antibacterial deodorant material at the fiber stage or by impregnating the solution with the antibacterial deodorant material solution. The way to do is taken. Further, in the case of wallpaper or a decorative sheet, it is necessary to fix it to a film or sheet. In that case, a method of applying an antibacterial deodorant material in a binder or the like is generally used.

However, when an antibacterial deodorant material is mixed with a binder or the like to form a coating film, the functional material is buried in the coating film, and microorganisms such as bacteria and mold that are functional, and malodorous components The probability of direct contact with the antibacterial deodorant material is reduced. For this reason, there exists a problem that an antibacterial deodorizing function cannot fully be exhibited.
On the other hand, a method of providing a fine concavo-convex structure or void on the surface of a substrate such as a film or sheet and pressing and holding an antibacterial deodorant material into the concave or void of the concavo-convex structure is also conceivable.
As a means for forming a concavo-convex structure on the surface of a film or sheet made of a plastic resin, when the concavo-convex structure is formed on a cooling roll or the like and the heat-melted resin is molded into a film or sheet, the cooling roll described above is used. There is a method of cooling by pressing the molten resin as a mold. By this method, an uneven structure can be formed on the film or sheet surface. However, with this method, the shape and size of the irregularities change after the cooling roll is removed from the surface of the film or sheet, so that the fine gaps and sufficient irregularities necessary to hold the antibacterial deodorant material are formed. It is difficult to do.

  There is also a method of forming fine irregularities and voids on the surface of the substrate using foam beads. In this method, foamed beads are kneaded into a hot-melt resin during film or sheet molding, and foamed with heat at the time of melting, and a coating liquid containing foamed beads is applied to the substrate, and the heat during drying is applied. There is a method of foaming. Here, in the method of kneading foam beads into the resin, the entire film or sheet becomes a porous body, which causes problems such as a decrease in physical strength of the base material or the need to use a large amount of foam beads. Therefore, it is considered that a method of applying a coating liquid containing foam beads is practical and effective.

In Patent Document 1, a hygroscopic agent-containing foamed aqueous emulsion layer containing a hygroscopic agent and a foaming agent is provided on foamed paper, and an aqueous emulsion containing a hygroscopic agent and titanium oxide is provided thereon, and then heated. The foaming agent is foamed to obtain a foamed wallpaper.
Patent Document 2 describes that a building material coating composition containing an alkali metal silicate and fine titanium oxide particles is applied and then dried and cured to obtain a porous building material coating film. ing.

JP 10-86259 A Japanese Patent Laid-Open No. 11-246787

However, Patent Document 1 adds a foaming agent for the purpose of improving the moisture absorption performance of moisture in the hygroscopic agent in the hygroscopic agent-containing foamed aqueous emulsion layer, and is not intended to improve the carrying ability of titanium oxide. Patent Document 2 also adds a foaming agent for the purpose of preventing the occurrence of cracks in the coating film, and is not intended to improve the carrying ability of the titanium oxide fine particles.
Therefore, the present invention has been made in view of such circumstances, and can improve the carrying ability of the antibacterial deodorant material and can maintain the antibacterial deodorant performance with high sustainability. It aims at providing the manufacturing method of a film, an antibacterial deodorizing film, and a packaging material.

  In order to solve the above problems, the method for producing an antibacterial deodorant film according to one aspect of the present invention includes a step of applying a first coating liquid containing foamed microcapsules and a binder onto a substrate. And applying a first drying treatment to the first coating liquid coated on the substrate to foam the foamed microcapsules, and having a fine uneven structure formed by the foaming on one surface A step of forming a resin layer; and a second coating liquid containing a material having an antibacterial deodorizing function and not including a binder is applied to one surface of the resin layer to have the antibacterial deodorizing function. A step of introducing a material into the concave portion of the concavo-convex structure, and a second drying treatment applied to the second coating liquid applied to one surface of the resin layer to have the antibacterial deodorizing function. Adhering a material to the inner surface of the recess. .

An antibacterial deodorant film according to one embodiment of the present invention includes a resin layer having a fine uneven structure on one surface, and a material having an antibacterial deodorant function provided in a recess of the uneven structure, The inside of the recess is a bubble-like space, and the material having the antibacterial and deodorizing function is fixed to the inner surface of the recess in an exposed state.
The packaging material which concerns on 1 aspect of this invention has said antibacterial deodorizing film, It is characterized by the above-mentioned.

  According to one embodiment of the present invention, a method for producing an antibacterial deodorant film, which can increase the carrying ability of the antibacterial deodorant material and can maintain the antibacterial deodorant performance with high sustainability, an antibacterial deodorant film, and a package Material can be provided.

It is sectional drawing which shows the structural example of the antibacterial deodorizing film which concerns on embodiment of this invention. It is sectional drawing which shows typically the manufacturing method of the antibacterial deodorizing film which concerns on embodiment of this invention. It is sectional drawing which shows typically the manufacturing method of the antibacterial deodorizing film which concerns on embodiment of this invention. It is sectional drawing which shows typically the manufacturing method of the antibacterial deodorizing film which concerns on embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
The embodiment of the present invention exemplifies a configuration for embodying the technical idea of the present invention, and specifies the material, shape, structure, arrangement, dimensions, etc. of each part as follows. Not. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

<Antimicrobial deodorant film>
FIG. 1 is a cross-sectional view showing a configuration example of an antibacterial deodorizing film according to an embodiment of the present invention.
As shown in FIG. 1, this antibacterial deodorizing film has an antibacterial deodorizing function provided in a resin layer 3 having a fine concavo-convex structure on one side (for example, a surface) and a concave part 5 of the concavo-convex structure. A material (hereinafter referred to as antibacterial deodorizing material) 7 and a base material 1 provided on the other surface side of the resin layer 3 are provided. That is, the resin layer 3 is provided on the substrate 1. A fine uneven structure is formed on the surface of the resin layer 3, and an antibacterial deodorant material 7 is provided in the recess 5. Moreover, the inside of this recessed part 5 becomes foam-like space, and the antibacterial deodorant material 7 has adhered to the inner surface of the recessed part 5 in the exposed state.
The fine concavo-convex structure is, for example, a concavo-convex structure in which the average period of the recesses is 10 or more and 100 or less and the average diameter of the recesses is 5 or more and 50 or less. The period is the arrangement pitch of the recesses.
Hereinafter, the substrate 1, the resin layer 3, and the antibacterial deodorant material 7 will be specifically described.

(1) Substrate As the substrate 1, stretched polyester film, stretched nylon film, stretched polypropylene film, polystyrene film, silica-deposited stretched polyester film, aluminum-deposited stretched polyester film, other barrier films, aluminum foil, etc. are generally flexible packaging. Any material can be used as long as it is used as a base material 1 film. Depending on the contents of the packaging material using the antibacterial deodorant film and the use of the antibacterial deodorant film, the optimum base material 1 can be selected and used as appropriate.
In order to improve the adhesion between the substrate 1 and the resin layer 3, it is desirable that the substrate 1 and the resin layer 3 have the same kind of resin as a main component. In addition, it is desirable to use a resin having as high a water resistance as possible on the surface of the resin layer 3, which is a surface having a fine uneven structure. Therefore, it is desirable that the resin and the resin layer 3 constituting the substrate 1 are both made of polyethylene or polypropylene.
In addition, the base material 1 is non-porous, and there are no fine irregularities or cavities on the surface and inside thereof. The surface of the base material 1 (that is, the surface in contact with the resin layer 3) is a flat surface.

(2) Resin layer The resin layer 3 is formed by applying the first coating liquid onto the substrate 1 and subjecting it to a first drying treatment to form the foamed microcapsules contained in the first coating liquid. It is a layer formed by foaming. For this reason, the resin layer 3 is porous and has a fine concavo-convex structure comprising a plurality of holes on the surface thereof. The film thickness of the resin layer 3 is, for example, 1 μm or more and 10 μm or less.
(3) Antibacterial deodorant material The antibacterial deodorant material 7 contains a photocatalyst and a transition metal. Any photocatalyst may be used as long as it contains at least one component selected from tungsten oxide and titanium oxide. The transition metal is more preferably a metal used as a metal catalyst such as Fe or Cu.

<Manufacturing method>
Next, the manufacturing method of the antibacterial deodorant film which concerns on embodiment of this invention is demonstrated.
2-4 is sectional drawing which shows typically the manufacturing method of the antibacterial deodorizing film which concerns on embodiment of this invention.
As shown in FIG. 2, first, a first coating liquid 3 ′ including foamed microcapsules 2 is applied onto the substrate 1 by a gravure printing method or the like. The first coating liquid 3 ′ is an organic solvent mainly composed of a polyolefin-based binder (resin) such as polyethylene or polypropylene. The foamed microcapsules 2 having high solvent resistance are dispersed in the organic solvent.
Next, a first drying process is performed on the first coating liquid 3 ′ coated on the substrate 1 to foam the foamed microcapsules 2. Thereby, as shown in FIG. 3, the resin layer 3 which has a fine uneven structure on the surface is formed. The concave portion 5 having a fine concavo-convex structure is composed of holes (cavities) generated by foaming of the foamed microcapsules.

  Incidentally, the binder used in the first coating liquid 3 ′ shown in FIG. 2 needs to be a resin having a melting point higher than the foaming start temperature of the foamed microcapsule 2. This is because the foamed microcapsule 2 is foamed by heating to dry the first coating liquid 3 ′, but if the resin around the foamed microcapsule 2 is melted at this temperature, it is a problem in processing. This is because the formation of a fine concavo-convex structure by foaming also hinders. However, since it is desirable that the surrounding resin is also softened to some extent when the foamed microcapsule 2 is foamed, the temperature of the first drying treatment is higher than the foaming start temperature of the foamed microcapsule 2, and the first coating is performed. A degree slightly lower than the melting point of the binder contained in the liquid 3 ′ is desirable. Further, the melting point of the binder contained in the first coating liquid 3 ′ is preferably equal to or lower than the heat resistance temperature of the base material 1.

That is, the foaming start temperature of the foamed microcapsule 2 is T1, the temperature of the first drying treatment is T2, the melting point of the binder contained in the first coating liquid 3 ′ is T3, and the heat resistance temperature of the substrate 1 is When T4, it is desirable that the relationship of T1 <T2 <T3 ≦ T4 is established. Thereby, a fine concavo-convex structure can be formed without hindrance.
The film thickness of the first coating liquid 3 ′ is desirably about 1 μm or more and 10 μm or less after drying. This is because the particle diameter after foaming of the added foamed microcapsule 2 is about 10 μm, and the first coating is used to form irregularities having an aspect ratio (that is, a dimensional ratio of width to depth) of at least about 1. This is because the working fluid 3 'needs to have the same film thickness. Further, in the gravure printing method, it is difficult to apply the coating liquid to a thickness exceeding 10 μm. In addition, since the base material 1 does not contain a foaming microcapsule, the inside and surface of the base material 1 are not foamed by the first drying treatment.

Next, as shown in FIG. 4, the 2nd coating liquid 6 containing the antibacterial deodorizing material 7 is applied to the surface of the resin layer 3 by a gravure printing method or the like. Thereby, the antibacterial deodorant material 7 is introduce | transduced in the recessed part of a fine uneven structure. The 2nd coating liquid 6 is an antibacterial deodorizing solution containing a photocatalyst and a transition metal. The second coating liquid 6 includes a solvent and an antibacterial deodorant material 7 dispersed in the solvent, and does not include a binder.
Thereafter, the second coating liquid 6 applied on the surface of the resin layer 3 is subjected to a second drying treatment to fix the antibacterial deodorant material 7 to the inner surface of the recess. By this second drying process, the solvent contained in the second coating liquid 6 is volatilized.

Here, as described above, when the heat resistance temperature of the substrate 1 is T4, the temperature in the second drying process is T5, and the heat resistance temperature of the resin layer 3 is T6, the relationship of T5 <T6 <T4 holds. It is desirable. Thereby, the antibacterial deodorant material 7 can be fixed to the inner surface of the recess without causing an appearance change or a characteristic change in the base material 1 or the resin layer 3.
Thus, the antibacterial deodorizing material 7 enters and adheres to the concave portion of the fine concavo-convex structure, thereby exhibiting the antibacterial deodorizing performance.
<Packaging material>
The packaging material which concerns on embodiment of this invention has said antibacterial deodorizing film.

<Effect of embodiment>
The embodiment of the present invention has the following effects (1) According to the antibacterial deodorant film according to the embodiment of the present invention, the resin layer 3 has a fine uneven structure on the surface thereof. The concave portion 5 having a fine concavo-convex structure is composed of holes (cavities) generated by foaming of the foamed microcapsules 2. That is, the inside of the recess 5 is a bubble-like space. The antibacterial deodorant material 7 is fixed to the inner surface of the recess 5 in an exposed state. Since the antibacterial deodorant material 7 is exposed and not buried in a binder or the like, the antibacterial deodorant performance can be sufficiently exhibited. Moreover, since the antibacterial deodorant material 7 has adhered to the inner surface of the recessed part 5, it can prevent the drop-off.

(2) According to the method of manufacturing the antibacterial deodorant film according to the embodiment of the present invention, in the step of introducing the antibacterial deodorant material 7 into the recess 5, the antibacterial deodorant material 7 is mixed with the binder and the coating film Instead, an antibacterial deodorizing solution that does not contain a binder is used as a coating film (second coating film), which is applied to the surface of the resin layer 3. By directly coating the surface of the resin layer 3 with an antibacterial deodorant solution that does not contain a binder, the antibacterial deodorant material 7 can be fixed in an exposed state after the drying (second drying treatment). In this method, since the antibacterial deodorant material 7 is not embedded in the binder, the antibacterial deodorant performance of the antibacterial deodorant material 7 can be sufficiently exhibited. Moreover, in this method, since the antibacterial deodorant material 7 can be fixed to the inner surface of the recess 5, the antibacterial deodorant material 7 can be prevented from falling off.

(3) Further, in the step of forming the resin layer 3, the surface area of the resin layer 3 can be increased by forming a fine concavo-convex structure in an appropriate range on the surface, and the wettability of the surface is improved. Can be made. Thereby, in the process of introducing the antibacterial deodorant material 7 into the recess 5, the coating property of the antibacterial deodorant solution on the resin layer 3 can be improved, and the coating amount per unit area can be increased. . As a result, more antibacterial deodorant material 7 can be fixed to the inner surface of the recess 5. This means that the functional surface area that exhibits the antibacterial deodorizing function can be increased.
(4) From the above, according to the embodiment of the present invention, the method for producing an antibacterial deodorizing film capable of enhancing the carrying ability of the antibacterial deodorant material 7 and capable of maintaining the antibacterial deodorizing performance with high sustainability. An antibacterial deodorizing film and a packaging material can be provided.

<Example 1>
A PET film having a thickness of 12 μm was used as a base material. On this substrate, 15 weight percent of foamed microcapsules are added to the first coating liquid composed mainly of a polyolefin binder (resin) and an organic solvent, and the film is dried by gravure printing. The coating was performed so as to have a thickness of 10 μm. After coating, a film having a fine concavo-convex structure on the surface was obtained by heating and drying through an oven at 90 to 100 ° C. About the uneven structure of this film, the average value (average period) of the period of a recessed part was 20 micrometers, and the average value (average diameter) of the diameter of a recessed part was 10 micrometers. In addition, the period of a recessed part is the arrangement pitch of a recessed part.
Subsequently, an antibacterial deodorant solution was applied to the surface of the film as a second coating liquid, and was heated and dried through an oven at 80 to 90 ° C. to produce an antibacterial deodorant film having an antibacterial deodorant function. .

<Comparative Example 1>
An antibacterial deodorant film was prepared in the same manner as in Example 1 except that the foamed microcapsules were not added to the first coating solution. A fine uneven structure was not formed on the surface of the antibacterial deodorant film, and the surface structure was flat.
<Antimicrobial properties>
Antibacterial evaluation was performed using Escherichia coli and Staphylococcus aureus.
First, cut out the prepared antibacterial deodorant film into 5 cm squares, put them one by one in a sterilized petri dish, apply 0.4 ml of the bacterial solution, and cover the 4 cm square film so that the bacterial solution spreads uniformly on the film. did. The bacterial solution was prepared using a 1/500 NB medium so that the bacterial concentration was 2.5 to 10 × 10 ⁵ cfu / ml. The type of the 4 cm square film is not particularly limited as long as the material has water resistance and adhesion. The sample immediately after application of the bacterial solution was designated as the immediately following section, and the sample which was covered with a petri dish and cultured at 35 ° C. for 24 hours was designated as the treatment section. Immediately after checking the number of viable bacteria in the treated area and the treated area, antibacterial properties that were able to suppress the number of growing bacteria to 2 or more orders of magnitude less than the number of bacteria grown on the untreated antibacterial deodorant film (negative control) It was.

<Deodorization performance>
The produced antibacterial deodorant film was cut into a 10 cm square, put into a sampling bag together with 3 L of 100 ppm of ammonia gas, and allowed to stand under light irradiation for 2 hours. Thereafter, the concentration of residual ammonia gas was measured with a gas detector tube. If the residual ammonia gas concentration is less than 20 ppm, ◎, less than 50 ppm ○, and more than ×, deodorant performance is evaluated.

As shown in Table 1, when a fine concavo-convex structure is formed on the film surface, the average period of the concave portions of the fine concavo-convex structure is 20 μm, and the average diameter of the concave portions is 10 μm, both antibacterial and deodorizing effects are obtained. Could get. In particular, the deodorizing property was highly effective.
On the other hand, in the case where a fine uneven structure was not formed on the film surface, although deodorizing property was obtained, antibacterial property was not obtained. The reason is considered to be that when there is no fine uneven structure on the film surface, the antibacterial and deodorant materials that can be carried on the film surface are reduced, and the antibacterial property cannot be obtained. Although the effect was reduced compared with the case where there was a fine uneven structure, the effect was acquired about deodorizing property. The reason why the effect differs between antibacterial and deodorant is that the odorous component to be deodorized is a gas, whereas the bacterial cell is a solid with a size of several μm and exhibits antibacterial properties. Therefore, it is considered that a larger amount of antibacterial deodorant material is required.

DESCRIPTION OF SYMBOLS 1 Base material 2 Foam microcapsule 3 Resin layer 3 '1st coating liquid 5 Recessed part 6 2nd coating liquid 7 Antibacterial deodorant material

Claims (8)

Applying a first coating liquid containing foamed microcapsules and a binder onto a substrate;
A resin layer having a fine concavo-convex structure formed on one surface by subjecting the first coating liquid applied on the base material to a first drying treatment to foam the foamed microcapsules. Forming a step;
A second coating liquid containing a material having an antibacterial deodorizing function and not containing a binder is applied to one surface of the resin layer, and the material having the antibacterial deodorizing function is placed in the concave portion of the concavo-convex structure. The process of introducing into
Applying a second drying treatment to the second coating liquid applied to one surface of the resin layer, and fixing the material having the antibacterial deodorizing function to the inner surface of the recess. The manufacturing method of the antibacterial deodorizing film characterized by the above-mentioned. The foaming start temperature of the foamed microcapsule is T1,
The temperature of the first drying process is T2,
The melting point of the binder contained in the first coating liquid is T3,
When the heat-resistant temperature of the substrate is T4,
2. The method for producing an antibacterial deodorizing film according to claim 1, wherein a relationship of T1 <T2 <T3 ≦ T4 is established. The heat-resistant temperature of the base material is T4,
The temperature in the second drying process is T5,
When the heat resistant temperature of the resin layer is T6,
The method for producing an antibacterial deodorant film according to claim 1 or 2, wherein a relationship of T5 <T6 <T4 is established. A resin layer having a fine relief structure on one surface;
A material having an antibacterial and deodorizing function provided in the concave portion of the concave-convex structure,
The inside of the recess is a bubble-like space,
An antibacterial deodorizing film, wherein the material having the antibacterial deodorizing function is fixed to the inner surface of the recess in an exposed state.   The antibacterial deodorizing film according to claim 4, further comprising a base material provided on the other surface side of the resin layer.   The antibacterial deodorant film according to claim 4 or 5, wherein the material having the antibacterial deodorant function includes a photocatalyst and a transition metal.   The antibacterial deodorant film according to claim 6, wherein the photocatalyst includes at least one component selected from tungsten oxide and titanium oxide.   A packaging material comprising the antibacterial deodorizing film according to any one of claims 4 to 7.

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