TW201635905A - Insect repellent sheet - Google Patents

Abstract

To exhibit an insect-repelling effect while minimizing insect repellent intake by people, etc., and to prolong said insect-repelling effect. This insect repellent sheet (1), which can emit an insect repellent, comprises an insect-repelling layer (2) which contains an insect repellent and which is formed from a thermoplastic resin, and two protective layers (3) which contact the outer surfaces of and cover the insect-repelling layer and which are formed from a thermoplastic resin. The crystallinity of the thermoplastic resin configuring the protective layers is less than or equal to the crystallinity of the thermoplastic resin configuring the insect-repelling layer.

Description

Insect-resistant sheet

The present invention relates to an insect-repellent sheet having a repellent effect (insect-preventing effect) for pests and the like.

Traditionally, lighting in places such as workshops has generally used fluorescent lamps (fluorescent lamps), so it is already a problem because the insects invade the building and cause problems in the quality of the products or hinder the work. Become a problem that cannot be ignored.

Therefore, in order to suppress the invasion of insects, it is preferable to have a repellent insect repellent sheet for insects and the like.

A method for solving such a problem has been proposed in which a film in which an insecticidal compound is kneaded in a synthetic resin (refer to Patent Document 1) and a side of a sheet-like substrate layer are provided. The method of the laminate of the pest repellent layer (refer to Patent Document 2).

[prior technical literature] [Patent Document]

[Patent Document 1] Unexamined Japanese Patent Publication No. 59-193283

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2005-002002

However, it is only a single-layer film in which an insecticidal compound (insecticide) is mixed (Patent Document 1), or a laminated film in which a pest repellent layer (insecticide) is provided on the surface exposed to the outside air (patent In the case of the literature 2), the insect repellent per unit time has a large amount of volatilization, so although the insect repellent effect is high, the safety for humans and the like is low, and the repellent effect for the insects cannot be For a long period of time.

Moreover, if the amount of volatilization of the insect repellent is large, the amount of the insect repellent present on the outer surface of the membrane is also large, so that the dust easily adheres to the insect repellent, and the repellent effect on the insect is also very high. Easy to lower. On the other hand, if the dust is to be removed and washed with water, the insecticide will flow out. In this case, there is also a problem that the repellent effect on the insect cannot be continued for a long period of time.

Further, if the insect repellent is present on the outer surface of the diaphragm, adhesion will occur, and if the film is processed, there will be a problem of poor workability. Therefore, considering these disadvantages, the practicality of the conventionally proposed diaphragm is not sufficient.

The present invention has been developed in order to solve the above problems, and an object of the invention is to provide an insect-resistant sheet having more excellent practicability.

The gist of the present invention is as follows.

[1] An insect-repellent sheet capable of releasing an insect repellent, comprising: a pest control layer composed of a thermoplastic resin containing the insect repellent; and contacting the outer surface of the insect repellent layer The two protective layers composed of the thermoplastic resin sandwiched by the insect-repellent layer, and the degree of crystallization of the thermoplastic resin constituting the protective layer are less than or equal to the degree of crystallization of the thermoplastic resin constituting the insect-repellent layer.

[2] The insect-resistant sheet according to the above [1], wherein the main component of the insect repellent is a pyrethroid-based insect repellent.

[3] The insect-resistant sheet according to the above [2], wherein the synthetic pyrethroid-based insect repellent is at least one selected from the group consisting of permethrin and cypermethrin.

[4] The insect-resistant sheet according to any one of the above [1], wherein the thickness of each of the protective layers is 1 μm or more and 100 μm or less.

[5] The insect-resistant sheet according to any one of the above [1] to [4], wherein the content of the insecticide is 0.1% by mass or more and 5% by mass or less based on the content of the insect repellent sheet.

According to the present invention, it is possible to provide a method for suppressing the intake of an insecticide by a human or the like, and exhibiting an insect-repellent effect, and is easy to use. A pest control sheet that makes the insect control effect more continuous.

1‧‧‧Insect-resistant sheet

2‧‧‧ pest layer

3‧‧‧Protective layer

4‧‧‧Insecticides

Fig. 1 is a schematic view showing the structure of a pest control sheet.

Fig. 2 is a cross-sectional view showing the pest control sheet in which the insect repellent is locally concentrated in the insect repellent layer.

An embodiment of the present invention will be described in detail with reference to Fig. 1 as follows.

The present embodiment relates to an insect-repellent sheet 1 capable of releasing an insect repellent, and as shown in Fig. 1, the insect-resistant sheet 1 has a pest-proof layer 2 and two protective layers 3. The insect control layer 2 has a base material composed of a thermoplastic resin and an insect repellent 4. The insect repellent 4 is held by the base material of the insect repellent layer 2 in a state of being dispersed inside the base material of the insect repellent layer 2. The two protective layers 3 are made of a thermoplastic resin and are in contact with the outer surface of the insect-repellent layer 2 to sandwich the insect-repellent layer 2. The insect repellent 4 is released from the insect-repellent layer 2 to the protective layer 3, and then released from the outer surface of the protective layer 3 (the outer surface of the insect-resistant sheet 1) to the outside of the insect-resistant sheet 1. Here, the degree of crystallization of the thermoplastic resin constituting the protective layer 3 of the insect-resistant sheet 1 is less than or equal to the degree of crystallization of the thermoplastic resin of the base material of the insect-preventing layer 2 constituting the insect-resistant sheet 1.

In the insect-proof sheet 1 of the present embodiment, the insect-repellent layer 2 is formed The base material and the thermoplastic resin of the protective layer 3 are not particularly limited as long as the shape of the insect-preventing layer 2 and the protective layer 3 can be maintained and the insect repellent 4 can be released to the outside of the insect-resistant sheet 1. Limited, can be used appropriately. Further, the thermoplastic resin constituting the base material of the insect-preventing layer 2 and the protective layer 3 may be the same or different thermoplastic resin. Examples of the thermoplastic resin include polyester, polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate, polybutylene terephthalate, and polytetramethylene terephthalate. Ethylene diformate, nylon, acrylic resin, polyvinylidene fluoride, polyethylene tetrafluoroethylene, polytetrafluoroethylene, polyvinyl alcohol, polycarbonate, Kevlar (registered trade name), polyacrylic acid resin, poly Methyl propylene carbon methyl ester, snail silk, copper ammonia fiber, Tencel cotton (registered trade name), Polynosic, acetate, triacetate. Among these thermoplastic resins, the thermoplastic material constituting the base material of the insect-preventing layer 2 and the protective layer 3 is a crystalline thermoplastic resin based on the strength of the insect-preventing layer 2 and the protective layer 3. Specifically, polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, nylon, polyvinylidene fluoride, etc. are mentioned. Among these, a thermoplastic resin which is relatively easy to form the insect-resistant sheet 1 is preferably polyethylene, polypropylene, polyethylene terephthalate or polybutylene terephthalate. In addition, if it is required to have transparency to the insect-resistant sheet 1, it is preferable to use a thermoplastic resin having excellent transparency and crystallinity such as polypropylene or polyethylene terephthalate.

In the present embodiment, the degree of crystallization of the thermoplastic resin constituting the protective layer 3 is selected to be less than or equal to the insect-repellent layer. The degree of crystallization of the thermoplastic resin of the base material of 2. The degree of crystallization of the thermoplastic resin can be adjusted according to the material of the thermoplastic resin or the temperature of the casting roll used for molding the insect-resistant sheet 1 to a predetermined temperature. When the relationship between the degree of crystallization, the material of the thermoplastic resin, and the temperature of the casting roll is calculated in advance, the degree of crystallization of the thermoplastic resin constituting the protective layer 3 can be made: less than or equal to The degree of crystallization of the thermoplastic resin constituting the base material of the insect-preventing layer 2.

When the degree of crystallization of the thermoplastic resin constituting the protective layer 3 is less than or equal to the degree of crystallization of the thermoplastic resin constituting the base material of the insect-preventing layer 2, it is mainly in the amorphous portion of the protective layer 3 The insect repellent 4 is easy to move, and the insect repellent 4 can be released to the outside of the insect-repellent sheet 1. In this way, it can be used to prevent insects. Here, if the degree of crystallization of the thermoplastic resin constituting the protective layer 3 is larger than the degree of crystallization of the thermoplastic resin constituting the base material of the insect-preventing layer 2, the insect repellent 4 is not easily disposed on the protective layer 3. The middle movement is made and it is not easily released to the outside of the insect-proof sheet 1, so the insect-repellent effect is easily lowered.

The degree of crystallization of the thermoplastic resin constituting the base material of the insect-preventing layer 2 is preferably 40% or more and 100% or less. The degree of crystallization of the thermoplastic resin constituting the protective layer 3 may be, for example, less than or equal to the degree of crystallization of the thermoplastic resin constituting the base material of the insect-repellent layer 2, specifically, 40% or more. In the range of 100% or less, it is preferable to produce a degree of crystallization (40% or more and 100% or less) of the thermoplastic resin which is less than or equal to the base material constituting the insect-preventing layer 2. In addition, it constitutes a pest control layer 2 and The degree of crystallization of the thermoplastic resin of the base material of the protective layer 3 can be measured by, for example, a powder X-ray diffraction method. In addition, the degree of crystallization of the thermoplastic resin constituting the base material of the insect-preventing layer 2 can be regarded as a single-layer insect-repellent layer 2 (sheet) formed under the same conditions as those when the insect-preventing layer 2 is formed. The thermoplastic resin of the base material has the same degree of crystallization.

The insect repellent 4 to be held by the insect repellent layer 2 is not particularly limited as long as the insect repellent 4 can be left in the insect repellent layer 2 when the insect repellent sheet 1 is melt-kneaded. It is up to the industry to make the appropriate choices. For example, the microencapsulated insect repellent 4 may be used, or the porous material may be used as a carrier to hold the insect repellent 4.

In the present embodiment, it is preferred to use the microencapsulated insect repellent 4. The microencapsulated insect repellent 4 is obtained by filling the insect repellent 4 with a liquid compound in a microcapsule. When a crystalline thermoplastic resin is used and melt-kneaded to form the insect-resistant sheet 1, the insect repellent 4 will migrate to the amorphous portion of the thermoplastic resin, and the insect repellent 4 which is not left in the amorphous portion will be used. It will flow out to the outer surface of the insect-proof sheet 1 and evaporate to the outside of the insect-proof sheet 1. Therefore, stickiness (adhesiveness) is generated, and it is difficult to form, or when the melt-kneading is performed, it is necessary to add the insect repellent 4 in excess of the required amount. When the microencapsulated insect repellent 4 is used, the insecticide 4 of the liquid compound can be retained in the microcapsules during melt kneading, and the migration of the insect repellent 4 to the amorphous portion of the thermoplastic resin can be suppressed. Phenomenon, therefore, the insect repellent 4 does not easily flow out to the outer surface of the insect-repellent sheet 1. As a result, the stickiness is less likely to occur, and it is possible to suppress the use of the insect repellent 4 which is more than the required amount.

The insect repellent 4 of the present embodiment is preferably contained in the insect-resistant sheet 1 in the form of a liquid compound. By using the insect repellent 4 of the liquid compound, the insect repellent 4 can be kept in a stable state, added to the insect repellent layer 2 at a high concentration, and can be easily adjusted inside the insect repellent sheet 1. The diffusion rate of the insect repellent 4. Further, although the main component of the insect repellent 4 is not particularly limited, it is preferred that the liquid form be maintained at a normal temperature. Specifically, synthetic pyrethroid insecticides such as pyrethrin, fenvalerate, Jasmolin, pyrethroid, furmethrin, fenvalerate, and permethrin Aminodipine insect repellents such as toxaphene, Benzoepin, organophosphorus insecticides such as malathion, chlorpyrifos, carbaryl, methomyl, and chlorpyrifos Formate insecticides, etc. These insect repellents can be used in a single type or in combination of two or more types. Among these insect repellents, synthetic pyrethroid insect repellents are preferably used because of their excellent repellent and quick-acting properties, and are not acutely toxic. Furthermore, among the pyrethroids, permethrin and etoprofen are preferred because they are easy to exert insecticidal effects at low concentrations and can be easily secured for humans and animals. Sex.

In the present embodiment, the insect repellent 4 contained in the insect repellent layer 2 is released to the insect repellent sheet 1 through the protective layer 3 in the insect repellent sheet 1 having the insect repellent layer 2 and the protective layer 3. Externally, therefore, the release of the insect repellent 4 can be adjusted in the protective layer 3. In this way, by comparing the structure in which the insect repellent 4 is contained in the protective layer 3, it is possible to relatively easily suppress the diffusion of the insect repellent 4 to the outside of the insect-repellent sheet 1, thereby ensuring safety for humans and animals. Sexuality and can extend the duration of the insect control effect.

When the insect-repellent layer 2 containing the insect repellent 4 is disposed on the outer surface of the insect-repellent sheet or the insect-repellent sheet containing only the single-layer structure of the insect repellent 4, the outer surface of the insect-repellent sheet is likely to be sticky. In the case where the insect sheet is subjected to, for example, welding, the workability is deteriorated (it becomes difficult to process). On the other hand, in the insect-resistant sheet 1 of the present embodiment, the insect repellent 4 is contained in the insect-repellent layer 2, and the insect repellent 4 must pass through the protective layer 3, so that the insect-repellent agent 4 can be suppressed from flowing out to the insect-proofing agent. The outer surface of the sheet 1 makes it less susceptible to stickiness. Therefore, it is easier to process to form the insect-resistant sheet 1.

Further, if the outer surface of the insect-repellent sheet is likely to be sticky, the outer surface of the insect-repellent sheet is likely to adhere to dust or the like. Dust or the like adhering to the outer surface of the insect-proof sheet will hinder the release of the insect-repellent agent from the insect-repellent sheet, and thus it is not preferable to reduce the insect-repellent effect. In addition, if the insect-repellent sheet is cleaned (for example, washed with water) in order to remove dust or the like adhering to the insect-proof sheet, the insect-repellent agent will be removed together with the dust and the like, and thus becomes Promoting the release of the insecticide from the insect-repellent sheet will shorten the duration of the insect-repellent effect.

On the other hand, in the present embodiment, as described above, since the insect repellent 4 can be prevented from flowing out to the outer surface of the insect-resistant sheet 1, it is possible to easily prevent dust or the like from adhering to the outer surface of the insect-resistant sheet 1, and It is possible to suppress the occurrence of the release of the insect repellent 4 due to dust or the like. Further, since the number of times the insect-repellent sheet 1 is cleaned can be reduced, the amount of the insect-repellent agent 4 that is removed together by the cleaning of the insect-repellent sheet 1 can be reduced, so that the duration of the insect-repellent effect can be prolonged.

The insect-repellent sheet 1 of the present embodiment which is used as the insect repellent 4 with permethrin is measured by an acetone washing method: the insect repellent 4 (permethrin) exposed on the outer surface of the insect-resistant sheet 1 In the case of the amount, it was found that the content of the insect repellent 4 (permethrin) was 0.4 μg or more and 10 μg or less per 1 g of the insect-repellent sheet. The so-called acetone cleaning method is a method of cleaning the outer surface of the insect-repellent sheet 1 with cotton wool moistened with an organic solvent such as acetone, and extracting an organic solvent such as acetone from the absorbent cotton after the cleaning treatment. Then, the amount of the insect repellent 4 in the organic solvent was measured. The amount of the above-mentioned insect repellent 4 is a numerical value of the insect repellent 4 content per 1 g of the insect repellent sheet calculated based on the measurement result of the acetone cleaning method.

When the content of the insect repellent 4 (permethrin) is less than 0.4 μg per 1 g of the insect repellent sheet, it is difficult to exhibit an insect control effect. In contrast, if the content of the insect repellent 4 (permethrin) exceeds 10 μg of the insect repellent 4 per 1 g of the insect-resistant sheet, when the human and the animal touch the insect-repellent sheet 1 and ingest it When the insect repellent 4 releases the insect repellent 4, the intake amount will exceed: the tolerance for health is not harmful. The World Health Organization (WHO) and the Food and Agriculture Organization of the United Nations (FAO) have investigated the adverse effects of permethrin on the human body based on data from many animal experiments. According to the results of this survey, even the human body ends up. The amount of daily intake (ADI: Acceptable Daily Intake) is set to "0.05 mg/day/kg". Convert this value to, for example, the equivalent of each day for a weight of 15 kg (about the weight of a three-year-old child) If it is, it is 0.75mg. That is to say, if it is permethrin, this amount is continuously taken every day, and it is not harmful to health. According to the present embodiment, when 75 g of the insect-resistant sheet 1 is used, the content (maximum value) of the insect repellent 4 is 0.75 mg. Although it varies depending on the thickness of the insect-repellent sheet 1, the chance that the human body will touch the area of the insect-resistant sheet 1 equivalent to 75 grams in a day is rare, so even if it is made of the insect-resistant sheet 1 The product can still prevent it from harming people's health.

Further, if the amount of the insect repellent 4 is increased, the outer surface of the insect-repellent sheet 1 will be sticky, resulting in deterioration of workability, and dust tends to adhere to the insect-resistant sheet 1 to reduce the insect-repellent effect. .

In the present embodiment, the cross-sectional shape of the insect-proof sheet 1 is not particularly limited as long as it is a shape in which the protective layer 3 covers the outer surface of the insect-proof layer 2 . The insect-resistant sheet 1 of the present embodiment is exposed as shown in Fig. 1, although the outer edge of the insect-preventing layer 2 is exposed, but the outer edge of the insect-preventing layer 2 may be covered with the protective layer 3. The thickness of the insect-repellent layer 2 is preferably uniform throughout the insect-repellent layer 2. Further, it is preferable that the thickness of the protective layer 3 is uniform throughout the protective layer 3. The thickness of the protective layer 3 is preferably 1 μm or more and 100 μm or less. When the thickness of the protective layer 3 exceeds 100 μm, it is difficult for the insect repellent 4 to pass through the protective layer 3 as compared with the case where the thickness of the protective layer 3 is 100 μm or less, and it is difficult for the insect-repellent sheet 1 to exhibit an insect-repellent effect. On the other hand, if the thickness of the protective layer 3 is less than 1 μm, the insect repellent 4 is relatively easy to pass through the protective layer as compared with the case where the thickness of the protective layer 3 is 1 μm or more. 3, the insect control effect is not easy to continue. Further, the thickness of the insect-proof sheet 1, the thickness of the insect-proof layer 2, and the thickness of the protective layer 3 can be measured by, for example, a microscope.

The method for producing the insect-resistant sheet 1 of the present embodiment can be appropriately selected by the manufacturer, and is not particularly limited. For example, a reasonable and inexpensive manufacturing method of the insect-repellent sheet 1 is to preliminarily fill the insect repellent 4 into the thermoplastic resin of the base material of the insect-repellent layer 2 constituting the insect-proof sheet 1, and to prevent the insect-repellent layer 2 And a method in which the protective layer 3 is kneaded by a melt extruder, and then formed by using a multilayer molding die. Specifically, particles such as a thermoplastic resin containing a liquid insect repellent 4 are preliminarily manufactured into master batch particles, and particles of the same thermoplastic resin as the master batch particles are mixed with the master batch particles at a certain ratio. The mixture was mixed together, and the insect repellent layer was melted by an extruder. At the same time, the particles of the thermoplastic resin are melted in the protective layer by an extruder. The melt melted in the extruder for the insect repellent layer and the melt melted in the extruder for the protective layer were formed into a film by a multilayer T-die. Then, the obtained film is sent out by a casting roll to produce the insect-resistant sheet 1 of the present embodiment. Further, by adjusting the temperature of the casting roll used for molding the insect-resistant sheet 1 to a predetermined temperature, the degree of crystallization of the thermoplastic resin constituting the protective layer 3 can be made: less than or equal to The degree of crystallization of the thermoplastic resin constituting the base material of the insect-preventing layer 2.

Here, after the protective layer 3 is stacked on the insect-repellent layer 2 to be fabricated into a laminate, the laminate is heated and stretched.

Filling the liquid insect repellent 4 with a thermoplastic resin In the case where the insect-preventing layer 2 is formed, although the insect repellent 4 can be uniformly dispersed in the insect-preventing layer 2, it can be formed into another form of the insect-repellent layer 2, and the insect repellent 4 is locally concentrated. Distributed inside the insect-repellent layer 2. For example, as shown in FIG. 2, the insect repellent 4 may be filled only in the upper half of the cross section of the insect repellent layer 2. For example, when the insect-resistant sheet 1 including the insect-repellent layer 2 is used as the insect-resistant sheet 1 for agriculture, the insect-repellent agent 4 can be locally distributed on the single-side surface of the insect-resistant sheet 1. When the insect-repellent sheet 1 is used to cover the crop, the outer surface of the insect-repellent sheet 1 on the side where the insect-repellent agent 4 is not provided can be disposed as the side of the crop, and the localized concentrated distribution of the insect-proofing The outer surface of the insect-repellent sheet 1 on the side of the agent 4 is disposed as the opposite side of the crop side. In this way, the insect repellent 4 can be released to the opposite side of the crop side, and the insects can be inhibited from approaching the insect-repellent sheet 1. Further, since the insect repellent 4 is not easily released to the crop, it is possible to suppress the adhesion of the insect repellent 4 to the crop.

In the present embodiment, the content of the insect repellent 4 in the insect-resistant sheet 1 is preferably 0.1% by mass or more and 10% by mass or less based on the insect-resistant sheet 1. When the content of the insect repellent 4 is less than 0.1% by mass, the insect repellent effect is relatively low and the duration of the insect repellent effect is also shortened as compared with the case where the content of the insect repellent 4 is 0.1% by mass or more. When the content of the insect repellent 4 is more than 10% by mass, the quality of the base material of the insect control layer 2 and the protective layer 3 constituting the insect-resistant sheet 1 is compared with the case where the content of the insect repellent 4 is 10% by mass or less. % will decrease, resulting in a decrease in the strength of the insect-resistant sheet 1. In addition, the stickiness is also generated to deteriorate the workability, making the production of the sheet difficult. In addition, although it is due to the thickness of the protective layer 3 The same, but the more the content of the insect repellent 4, the more the insect repellent 4 is exposed on the outer surface of the insect-repellent sheet 1, and the intake of the insect repellent 4 by humans and animals is also increased. . The content of the insect repellent 4 in the insect-resistant sheet 1 is more preferably 0.1% by mass or more and 5% by mass or less. When the content of the insect repellent is 0.1% by mass or more and 5% by mass or less, the sticking property is less likely to occur, so that the processing of the insect-resistant sheet 1 is less likely to occur.

Further, the insect-resistant sheet 1 of the present embodiment may contain a component for imparting a desired function as a functional material. Examples of the functional material include titanium dioxide as a matting agent, fine particles such as calcium stearate, cerium oxide, and aluminum oxide as lubricants, and hindered phenol derivatives as antioxidants. In addition to pigments such as pigments; additives such as stabilizers and dispersants, there are also: UV blockers, near-infrared barriers, antibacterial agents, anti-fungal agents, anti-static agents, flame retardants, and resistant Climatic agents and functional materials such as various catalysts. Further, these functional materials may be present in the insect repellent layer 2 in a dispersed manner together with the insect repellent 4, or may be dispersedly present in the protective layer 3, or may be attached to the outer surface of the insect repellent sheet 1. .

Further, the insect-resistant sheet 1 of the present embodiment may be formed into a structure of four or more layers in which, in addition to the insect-preventing layer 2 and the protective layer 3, another layer is provided to contain: Functional ingredients of functional ingredients. The other layer may be a matting agent layer, a lubricant layer, an antioxidant layer, a colored layer, an ultraviolet blocking agent layer, a near-infrared barrier layer, an antibacterial agent layer, an antifungal agent layer, a charging inhibitor layer, and a flame retardant layer. The agent layer, the weather resistant agent layer, and the adhesive layer for adhering the insect-proof sheet 1 to the posted object A layer, a reinforcing layer used to increase the strength of the sheet.

Further, inorganic fine particles may be chemically bonded to the outer surface of the insect-resistant sheet 1 of the present embodiment to form fine irregularities. By forming fine concavities and convexities, it is possible to make dust or the like floating in the air more difficult to adhere to the outer surface of the insect-repellent sheet 1. Further, even if dust or the like has adhered to the outer surface of the insect-proof sheet 1, it is possible to remove only the dust by using a method such as water rinsing, and it is not exposed on the outer surface of the insect-resistant sheet 1. The insect repellent 4 is removed. Therefore, it is possible to produce the insect-resistant sheet 1 which is excellent in dustproofness.

According to the above-described aspect, the insect-repellent sheet 1 of the present embodiment can release the minimum insect repellent 4 required to exhibit the insect-repellent effect, and it is easier to ensure the duration of the insect-repellent effect. The insect-resistant sheet 1 of the present embodiment can be applied to various uses such as a sliding door sheet for a food factory, a plastic greenhouse, a clean room, a wall surface of an existing building, a window glass, and the like.

[Examples]

Next, the insect-resistant sheet of the present embodiment will be described in more detail with reference to examples, but the technical scope of the present invention is not limited to these examples.

(Example 1)

Prepare masterbatch pellets consisting of: permethrin (insecticide) and highly crystalline homogeneous polypropylene resin. And prepared by: high crystalline homogeneous polypropylene A granule composed of an olefin resin. The molten masterbatch particles are mixed with a highly crystalline homogeneous polypropylene resin to obtain a mixture containing a predetermined amount of permethrin. The granules are melted to produce a melt. These melts are extruded together with the mixture from a T-die extrusion molding apparatus, thereby producing a pesticidal layer composed of a highly crystalline homogeneous polypropylene resin containing permethrin, which is subjected to a highly crystalline homogeneous polypropylene. The two protective layers composed of a resin sandwich the three-layered insect-proof sheet. In the obtained insect-repellent sheet, the thickness of the insect-repellent layer was 144 μm, and the thickness of each of the two protective layers was 28 μm. Further, the content of permethrin relative to the obtained insect-repellent sheet was 1% by mass. This insect-repellent sheet was used as the insect-proof sheet of Example 1.

(Example 2)

The masterbatch pellets used in Example 1 were replaced with masterbatch pellets composed of an methrin (insecticide) and a highly crystalline homogeneous polypropylene resin. In the other conditions, the same conditions as in Example 1 were carried out, and a pesticidal layer composed of a highly crystalline homogeneous polypropylene resin containing ethathrin was obtained, which was composed of two crystals of a highly crystalline homogeneous polypropylene resin. A three-layered insect-proof sheet sandwiched by a protective layer. In the obtained insect-repellent sheet, the thickness of the insect-repellent layer was 144 μm, and the thicknesses of the two protective layers were 28 μm, respectively. Further, it is 1% by mass based on the content of the etofenprox of the obtained insect-repellent sheet. This insect-repellent sheet was used as the insect-proof sheet of Example 2.

(Example 3)

Using particles composed of low crystalline heterogeneous polypropylene resin Instead of the particles composed of the highly crystalline homogeneous polypropylene resin used in Example 1. The conditions other than the above were obtained under the same conditions as in Example 1 to obtain a pesticidal layer composed of a highly crystalline homogeneous polypropylene resin containing permethrin, which was subjected to a low crystallinity heterogeneous polypropylene resin. The two protective layers are formed by sandwiching the three-layered insect-proof sheet. In the obtained insect-repellent sheet, the thickness of the insect-repellent layer was 144 μm, and the thicknesses of the two protective layers were 28 μm, respectively. Further, the content of permethrin relative to the obtained insect-repellent sheet was 1% by mass. This insect-repellent sheet was used as the insect-proof sheet of Example 3.

(Example 4)

A mixture having a different permethrin content was used as compared to the mixture used in Example 1. The thickness of the insect-repellent layer referred to in Example 1 was changed to 190 μm, and the thicknesses of the two protective layers were each made 5 μm. The conditions other than the above were obtained under the same conditions as in Example 1 to obtain a pesticidal layer composed of a highly crystalline homogeneous polypropylene resin containing permethrin, which was subjected to two crystals composed of a highly crystalline homogeneous polypropylene resin. A three-layered insect-proof sheet sandwiched by a protective layer. The content of permethrin relative to the obtained insect-repellent sheet was 1% by mass. This insect-repellent sheet was used as the insect-proof sheet of Example 4.

(Example 5)

A mixture having a different permethrin content was used as compared to the mixture used in Example 1. The thickness of the insect-repellent layer referred to in Example 1 Changed to 60 μm, the thicknesses of the two protective layers were each made 70 μm. The conditions other than the above were obtained under the same conditions as in Example 1 to obtain a pesticidal layer composed of a highly crystalline homogeneous polypropylene resin containing permethrin, which was subjected to two crystals composed of a highly crystalline homogeneous polypropylene resin. A three-layered insect-proof sheet sandwiched by a protective layer. The content of permethrin relative to the obtained insect-repellent sheet was 1% by mass. This insect-repellent sheet was taken as the insect-proof sheet of Example 5.

(Example 6)

A mixture having a different permethrin content was used as compared to the mixture used in Example 1. The thickness of the insect-repellent layer referred to in Example 1 was changed to 40 μm, and the thicknesses of the two protective layers were each made 80 μm. The conditions other than the above were obtained under the same conditions as in Example 1 to obtain a pesticidal layer composed of a highly crystalline homogeneous polypropylene resin containing permethrin, which was subjected to two crystals composed of a highly crystalline homogeneous polypropylene resin. A three-layered insect-proof sheet sandwiched by a protective layer. The content of permethrin relative to the obtained insect-repellent sheet was 1% by mass. This insect-repellent sheet was taken as the insect-proof sheet of Example 6.

(Example 7)

A mixture having a different permethrin content was used as compared to the mixture used in Example 1. In the other conditions, the same conditions as in Example 1 were employed, and a pesticidal layer composed of a highly crystalline homogeneous polypropylene resin containing permethrin was obtained from a highly crystalline homogeneous polypropylene resin. The two protective layers sandwiched by the three-layered insect-proof sheet. In the obtained insect-repellent sheet, the thickness of the insect-repellent layer was 144 μm, and the thicknesses of the two protective layers were 28 μm, respectively. Further, the content of permethrin relative to the obtained insect-repellent sheet was 3% by mass. This insect-repellent sheet was used as the insect-proof sheet of Example 7.

(Example 8)

A mixture having a different permethrin content was used as compared to the mixture used in Example 1. The conditions other than the above were obtained under the same conditions as in Example 1 to obtain a pesticidal layer composed of a highly crystalline homogeneous polypropylene resin containing 0.1% permethrin, which was subjected to a highly crystalline homogeneous polypropylene resin. The two protective layers are formed by sandwiching the three-layered insect-proof sheet. In the obtained insect-repellent sheet, the thickness of the insect-repellent layer was 144 μm, and the thicknesses of the two protective layers were 28 μm, respectively. Further, the content of permethrin relative to the obtained insect-repellent sheet was 0.1% by mass. This insect-repellent sheet was taken as the insect-proof sheet of Example 8.

(Example 9)

A mixture having a different permethrin content was used as compared to the mixture used in Example 1. The conditions other than the above were obtained under the same conditions as in Example 1 to obtain a pesticidal layer composed of a highly crystalline homogeneous polypropylene resin containing permethrin, which was subjected to two crystals composed of a highly crystalline homogeneous polypropylene resin. A three-layered insect-proof sheet sandwiched by a protective layer. In the prepared insect-resistant sheet, the thickness of the insect-repellent layer is 144 μm, and the thickness of the two protective layers is divided. Don't both be 28μm. Further, the content of permethrin relative to the obtained insect-repellent sheet was 5% by mass. This insect-repellent sheet was used as the insect-proof sheet of Example 9.

(Embodiment 10)

A mixture having a different permethrin content was used as compared to the mixture used in Example 1. The conditions other than the above were obtained under the same conditions as in Example 1 to obtain a pesticidal layer composed of a highly crystalline homogeneous polypropylene resin containing permethrin, which was subjected to two crystals composed of a highly crystalline homogeneous polypropylene resin. A three-layered insect-proof sheet sandwiched by a protective layer. In the obtained insect-repellent sheet, the thickness of the insect-repellent layer was 144 μm, and the thicknesses of the two protective layers were 28 μm, respectively. Further, the content of permethrin relative to the obtained insect-repellent sheet was 0.01% by mass. This insect-repellent sheet was taken as the insect-proof sheet of Example 10.

(Comparative Example 1)

The masterbatch pellets used in Example 1 and the pellets composed of the highly crystalline homogeneous polypropylene resin were melted and mixed to obtain a mixture containing a predetermined content of permethrin. This mixture was extruded from a T-die extrusion molding apparatus to obtain a monolayer-structured insect-repellent sheet composed of a highly crystalline homogeneous polypropylene resin containing permethrin. The thickness of the obtained insect-repellent sheet was 200 μm. Further, the content of permethrin relative to the obtained insect-repellent sheet was 1% by mass. This insect-repellent sheet was used as the insect-proof sheet of Comparative Example 1.

(Comparative Example 2)

The masterbatch pellets used in Example 2 and the pellets composed of the highly crystalline homogeneous polypropylene resin were melted and mixed to obtain a mixture containing a predetermined amount of etofenproxil. This mixture was extruded from a T-die extrusion molding apparatus to obtain a monolayer-structured insect-repellent sheet composed of a highly crystalline homogeneous polypropylene resin containing ethalide. The thickness of the obtained insect-repellent sheet was 200 μm. Moreover, it is 1 mass % with respect to the content of the etotheside of the insect-repellent sheet obtained. This insect-repellent sheet was used as the insect-proof sheet of Comparative Example 2.

(Comparative Example 3)

The high crystalline homogeneous polypropylene resin is melted to obtain a melt. The melt was extruded from a T-die extrusion molding apparatus to obtain a film of a single-layer structure composed of a highly crystalline homogeneous polypropylene resin. The thickness of the obtained film was 200 μm. This film was used as the insect-proof sheet of Comparative Example 3.

(Comparative Example 4)

Prepared: masterbatch pellets consisting of low crystalline heterogeneous polypropylene resin containing permethrin. Also prepared: particles composed of a highly crystalline homogeneous polypropylene resin. The molten masterbatch particles are mixed with a low crystalline heterogeneous polypropylene resin to obtain a mixture containing a predetermined content of permethrin. The particles are melted to obtain a melt. These melts are extruded together with the mixture from a T-die extrusion molding apparatus, thereby producing a pesticidal layer composed of a low crystallinity homogeneous polypropylene resin containing permethrin, which is subjected to a highly crystalline homogeneous polypropylene. Anti-three-layer structure of two protective layers composed of resin Insect flakes. In the obtained insect-repellent sheet, the thickness of the insect-repellent layer was 144 μm, and the thickness of each of the two protective layers was 28 μm. Further, the content of permethrin relative to the obtained insect-repellent sheet was 1% by mass. This insect-repellent sheet was used as the insect-proof sheet of Comparative Example 4.

(Comparative Example 5)

A mixture having a different permethrin content was used as compared to the mixture used in Example 1. The material used in the insect repellent layer of Example 1 and the material used for the protective layer were mutually adjusted. Other conditions were the same as in Example 1, and a central layer composed of a highly crystalline homogeneous polypropylene resin was obtained, which was subjected to two outer layers composed of a highly crystalline homogeneous polypropylene resin containing permethrin. A three-layered insect-proof sheet that is clamped. In the obtained insect-repellent sheet, the thickness of the center layer was 144 μm, and the thickness of both outer layers was 28 μm, respectively. Further, the content of permethrin relative to the obtained insect-repellent sheet was 1% by mass. This insect-repellent sheet was used as the insect-proof sheet of Comparative Example 5.

(Measurement of crystallinity)

With respect to the insect-resistant sheets of Examples 1 to 10 and Comparative Examples 1 to 5, the degree of crystallization of the polypropylene resin of the base material constituting the protective layer (outer layer) was measured by a powder X-ray diffraction method (for the comparative example) 1 to 3, the degree of crystallization of the polypropylene resin constituting the base material of the insect-resistant sheet is measured. Further, the degree of crystallization of the polypropylene resin constituting the base material of the insect repellent layer (center layer) is formed as a single layer under the same conditions as those for forming the insect repellent layer. The worm layer (sheet) was obtained by measuring the degree of crystallization of the polypropylene resin constituting the base material of the insect-repellent layer (sheet) by a powder X-ray diffraction method. The results are shown in Table 1.

(Evaluation 1: Safety Assessment)

In order to evaluate the safety of the insect-proof sheet of the present embodiment, the following evaluations were carried out.

The one-side surface (the surface of the one-side protective layer) of the insect-repellent sheets of Examples 1 to 10 and Comparative Examples 1 to 5 was wiped with cotton wool moistened with acetone, and acetone was extracted from the absorbent cotton. The amount of the insect repellent contained in the extracted acetone was measured by gas chromatography mass spectrometry (GC-MS). Further, the amount (ng/cm ² ) of the insect repellent exposed per 1 cm ² of the insect-repellent sheet was calculated from the measured amount of the insect repellent. From the calculated results, it is calculated that the amount of the insect repellent exposed on the surface of each insect-repellent sheet (the surface of the protective layer) is in accordance with the infant weighing 15 kg calculated based on the daily allowable intake (ADI). The area (m ² ) of each insect-proof sheet at the time of daily intake of the child (hereinafter, sometimes referred to as "area when the allowable intake amount is satisfied"). In addition, the daily allowable intake of infants and young children weighing 15 kg calculated based on the daily allowable intake (ADI) is 0.75 mg if the insecticide is permethrin, and the insecticide is efenthrin. In the case of 0.45 mg.

The assessment of safety is based on the following assessment criteria. In addition, when the evaluation is "A", it is judged that it has excellent safety. If the evaluation is "B", it is judged to be safe, and if the evaluation is "C", it is judged that it is not safe. The results are shown in Table 2 to be described later.

[assessment basis]

A: The area when the allowable intake amount is more than 0.5 m ² .

B: The area at which the allowable intake amount is 0.1 m ² or more and 0.5 m ² or less.

C: The area when the allowable intake amount was less than 0.1 m ² .

(Evaluation 2: Repellent Assessment)

In order to evaluate the repellent property of the insect-repellent sheet of the present embodiment, the following evaluations were carried out.

The surface of the lampshade (circular shape, diameter: 17 cm) provided under the fluorescent lamp outside the house was covered with the insect-proof sheets of Examples 1 to 10 and Comparative Examples 1 to 5, respectively. The illuminator was lit for 10 minutes, and after 10 minutes, the number of flying insects remaining on the lampshade covered by each insect-resistant sheet was counted. Also, the flying Kunming staying on the lampshade The worms are all chironomids.

The number of flying insects that are counted on the lampshade covered by the insect-proof sheet of Comparative Example 3 which does not contain the insect repellent is used as a reference, and the number of flying insects counted is based on the following formula ( a) Calculate the repellent rate of each insect-repellent sheet.

In the formula (a), the X system indicates the number of flying insects staying on the lampshade covered by the insect-proof sheet of Comparative Example 3, and the Y system indicates that the lampshade is covered by the insect-resistant sheet. The number of flying insects on the only.

The assessment of repellent is based on the following assessment criteria. In addition, if the evaluation is "A", it is judged that it has excellent repellent property. If the evaluation is "B", it is judged that it has repellent property, and if the evaluation is "C", it is judged that it is not repellent. The results are shown in Table 2 to be described later.

[assessment basis]

A: The repellent rate is more than 60%

B: Repellent rate is 30~60%

C: The repellent rate is less than 30%

(Evaluation 3: Assessment of dust adhesion inhibition effect)

In order to evaluate the dust adhesion suppressing effect of the insect-proof sheet of the present embodiment, the following evaluations were carried out.

The insect-resistant sheets of Examples 1 to 10 and Comparative Examples 1 to 5 were cut into small pieces of 10 cm × 10 cm, and mixed dust was uniformly sprinkled on the upper surface (protective layer) of the insect-resistant sheets of the respective small pieces. After lifting the insect-repellent sheets which have been sprinkled with the mixed dust, lift them upside down and apply a predetermined number of vibrations to shake off the unattached mixed dust that has not adhered to the insect-proof sheets. . The weight of each of the insect-repellent sheets before the mixed dust was sprinkled and the weight of each of the insect-proof sheets after the unattached mixed dust was shaken off was measured, and the weight of the mixed dust adhering to each of the insect-resistant sheets was calculated. In addition, the mixed dust was 15 types of the test powder 1 prescribed by Japanese Industrial Standard JIS Z 8901.

The evaluation of the dust adhesion inhibition effect was carried out based on the following evaluation criteria. In addition, when the evaluation is "Good", it is judged that it has a dust adhesion suppressing effect. The results are shown in Table 2 to be described later.

[assessment basis]

Good: The average weight of the mixed dust attached to the insect-proof sheet is 60 mg or less.

Poor: The average weight of the mixed dust attached to the insect-proof sheet exceeds 60 mg.

As shown in Table 2, the evaluation results of the insect-repellent sheets of Examples 1 to 10, the evaluation 1 (safety evaluation) and the evaluation 2 (repellent evaluation) are "A" or "B". The evaluation result of the evaluation 3 (the evaluation of the dust adhesion suppression effect) is "Good". As a result, it was found that the insect-proof sheet of the present embodiment has safety, repellent properties, and dust adhesion suppressing effects. More specifically, the insect-resistant sheet of the present embodiment is formed into the above-described configuration, so that the amount of the insect repellent exposed on the surface of the insect-proof sheet can be controlled to the minimum required to exhibit the insect-repellent effect. The amount of the limit thus ensures safety and also inhibits the adhesion of dust. Further, since the insect-proof sheets of Examples 1 to 10 have a dust adhesion suppressing effect, the insect-proof sheet of the present embodiment can continue the insect-repellent effect and is less likely to cause stickiness (adhesiveness), and can be compared. Easy to shape.

In contrast, the insect-repellent sheets of Comparative Examples 1 to 5 were evaluated in the evaluation of at least one of the evaluations 1 to 3, and the evaluation result was "Poor" or "C". From this result, it can be known that the insect-repellent sheets of Comparative Examples 1 to 5 are safe. At least one of the effects of sex, repellent, and dust adhesion inhibition is lacking.

In particular, in the insect-repellent sheets of Comparative Examples 1 to 2 and 5, the evaluation result of the evaluation 1 was only reached to the extent of "C". As a result, it was found that the insect-repellent sheet having a single-layer structure and the insect-proof sheet having a three-layer structure containing an insect repellent on the outer layer were more likely to be exposed to the surface of the insect-repellent sheet. Further, in the insect-repellent sheets of Comparative Examples 1 to 2 and 5, the evaluation result of the evaluation 3 was "Poor". One of the reasons for this result is considered to be because of a monolayer-structured insect-repellent sheet and a three-layered insect-proof sheet containing an insect repellent in the outer layer, and the insecticide is more likely to be exposed on the surface of the insect-proof sheet. And it is easy to let the dust adhere.

Further, in the insect-repellent sheet of Comparative Example 4, the evaluation result of the evaluation 2 was "C", and therefore, as shown by the result of the evaluation 1, the area at which the intake amount was allowed was compared with Example 1~ 10 insect-proof sheets are larger. From this result, it is understood that in the insect-repellent sheet in which the degree of crystallization of the thermoplastic resin constituting the protective layer is larger than the degree of crystallization of the thermoplastic resin constituting the insect-repellent layer, the insect repellent is less likely to move inside the protective layer, and the insect-proofing agent The agent is not easily released to the outside of the insect-repellent sheet.

Further, in the insect-repellent sheet of Comparative Example 3, in the evaluation 3, the amount of the mixed dust adhered was the least, but the reason was considered to be because the insect-repellent sheet did not contain the insecticide.

In addition, the insecticidal sheet of Examples 1 to 9 in which the content of the insect repellent is 0.1% by mass or more, and the content of the insect repellent is less than 0.1% by mass (0.01% by mass) of Example 10 Insect-resistant sheet phase In comparison, the repellent rate can be increased by more than 11%. As a result, it was found that the insect-repellent sheet having an insecticide content of 0.1% by mass or more can more easily exhibit an insect-repellent effect than the insect-resistant sheet having an insecticide content of less than 0.1% by mass.

1‧‧‧Insect-resistant sheet

2‧‧‧ pest layer

3‧‧‧Protective layer

4‧‧‧Insecticides

Claims (5)

An insect-repellent sheet which is an insect-repellent sheet capable of releasing an insect repellent, comprising: a pest-proof layer composed of a thermoplastic resin containing the insect-repellent agent; and an outer surface contacting the insect-repellent layer The two protective layers composed of the thermoplastic resin sandwiched by the insect-repellent layer, and the degree of crystallization of the thermoplastic resin constituting the protective layer is less than or equal to the degree of crystallization of the thermoplastic resin constituting the insect-repellent layer. . The insect-resistant sheet according to claim 1, wherein the main component of the insect repellent is a pyrethroid-based insect repellent. The insect-resistant sheet according to claim 2, wherein the synthetic pyrethroid-based insect repellent is at least one selected from the group consisting of permethrin and fenthrin. The insect-resistant sheet according to any one of claims 1 to 3, wherein each of the protective layers has a thickness of 1 μm or more and 100 μm or less. The insect-resistant sheet according to any one of claims 1 to 4, wherein the insecticide-containing sheet is contained in an amount of 0.1% by mass or more and 5% by mass or less based on the content of the insecticide.