JP2017066120A - Insect repellent material and insect repellent member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insect repellent material capable of continuously emitting insect repellent that repels insects for a long period of time, and an insect repellent member using the insect repellent material.SOLUTION: The inventor completed the following invention upon discovery that a substrate which has a material having pores of a nanometer order is constituted of ceramic and a carbon material, is allowed to carry insect repellent in the pores, and the insect repellent can stably exist in the pores, by which the substrate can continuously emit the insect repellent being carried for a long period of time. Specifically, the insect repellent material of the present invention has a porous material which is made of ceramics and/or a carbon material and has the pore diameter of 1 μm or less, and insect repellent having insect repellent effect which is carried in pores of the porous material.SELECTED DRAWING: None

Description

  The present invention relates to an insect repellent material that can repel insects such as mites and an insect repellent member using the insect repellent material.

  It is known that natural materials such as hinokitiol have an action to repel insects such as mites, and mite repellents that gradually evaporate are provided (Patent Documents 1 and 2, etc.).

JP 2004-244756 A JP-A-8-336698

http://www.iph.pref.osaka.jp/merumaga/back/9.htm, “Analysis method of hinokitiol in antibacterial processed textile products and enhancement of antibacterial effect by photolysis” Ann. Rep. Tokyo Metr. Inst. P.H., 54, 247-250, 2003, Analysis of hinokitiol from kitchenware

  However, it has been difficult for microcapsules enclosing components derived from natural products such as hinokitiol to continue to be released over a long period of time (Non-Patent Documents 1 and 2, etc.). The technique of Patent Document 1 employs a configuration in which an active ingredient is confined in a microcapsule, but acrylic resin or the like is employed as a material constituting the microcapsule, and it has been difficult to control sustained release.

  The present invention has been completed in view of the above circumstances, and solves the problem of providing an insect repellent material capable of continuously releasing an insect repellent that repels insects over a long period of time and an insect repellent member using the insect repellent material. It should be a challenge.

  As a result of intensive studies for the purpose of solving the above-mentioned problems, the present inventors have found that the material has nanometer-order pores, and the insect repellent is contained in the pores of the substrate composed of ceramics and carbon materials. The following invention was completed by discovering that the insect repellent supported by the support can be stably present in the pores, so that it is possible to continue releasing the insect repellent supported over a long period of time. .

That is, the insect repellent material of the present invention comprises a porous material made of a ceramic and / or carbon material and having a pore diameter of 1 μm or less,
An insect repellent having an insect repellent action carried in the pores of the porous material;
Have

Further, the insect repellent member of the present invention, a base material formed from a fibrous and / or foam-like resin material,
Particulate material consisting of the insect repellent material of the above invention dispersed in the substrate and / or attached to the surface of the substrate;
Have

  A substrate having a fibrous or foam-like form has a large specific surface area and can attach or knead many insect repellent materials. In addition, since the insect repellent material of the present invention can release the insect repellent continuously over a long period of time, it is possible to provide an insect repellent member having an excellent insect repellent action. Here, “the insect repellent can be released continuously over a long period of time” means that the insect repellent can be released under the conditions of use, and the decrease (release) of the insect repellent is small during storage.

  Hereinafter, the insect repellent material and the insect repellent member of the present invention will be described in detail based on embodiments.

(Insect repellent)
The insect repellent member of this embodiment can adopt a fibrous or foam (foam) form. It can be used as a cushion for beds, sofas, chairs, etc. by using a foam, and can also be processed into a flat plate and used as a rug. Mites and cockroaches can be repelled by the effect of the insect repellent released from the insect repellent member. The insect repellent member can be used only for the purpose of repelling insects (for example, a use form such as a cockroach dumpling well known for repelling cockroaches).

  Furthermore, it can be used as a flooring, wall material, and ceiling material after forming a plate-like body. It is preferable to use it in a warehouse for storing articles that may cause insect damage. Moreover, the effect similar to the case where a cypress bath is used can also be exhibited by employ | adopting as a floor material of a bathroom, a wall material, and a ceiling material. The bathtub itself can also be formed by the insect repellent member of this embodiment.

  In addition, by providing a through-hole that penetrates the air, the insect repellent can be effectively released into the air by allowing the air to pass therethrough. It is desirable to provide a plurality of through holes. By providing a plurality, the area in contact with air can be increased. The through hole may be filled with an insect repellent material, in which case the presence of the through hole may not be visible.

  When it is made into a fibrous form, it can be made into a woven fabric or a non-woven fabric and applied to a clothing bag, clothes, a futon cover and the like. It can also be a net or string.

  Furthermore, by arranging the insect repellent member of the present invention in the air blowing port and air intake port of the futon dryer, clothing dryer, and air cleaner, the air blown out contains the insect repellent. be able to. Insect repellents are released when devices are designed to blow out hot air, especially in futon dryers and clothes dryers, by placing an insect repellent member so that the hot air can pass. The insect repellent can be effectively released only when necessary. That is, since it can be adjusted so that an appropriate amount of insect repellent is released by passing warm air, the release of the insect repellent can be suppressed in a state of room temperature that is not used.

  The insect repellent member of this embodiment has a base material and an insect repellent material. The insect repellent material will be described later. The substrate is in the form of a fiber or foam. The base material is formed from a resin material. Examples of the resin material include polyester, polyamide, polyurethane, polyethylene, and polypropylene. The base material is provided with an insect repellent material inside or on the surface. In this case, the insect repellent material is in the form of particles. The particle size depends on the size of the substrate. When the substrate is fibrous, it is desirable that it is sufficiently smaller than the fiber diameter. For example, the upper limit of the particle size is 10 μm, 5 μm, 3 μm, 2 μm, or the like.

  When arranged inside, it can be spun or foamed while dispersed in the resin material. In addition, the insect repellent material is adhered or spread on the surface of the substrate by immersing the substrate in a state of being dispersed in an appropriate dispersion medium (hereinafter simply referred to as “adhesion” means “spread”) Can be included). By further subdividing the resin composition (insect repellent member) in which the insect repellent material is dispersed in the resin material and further dispersing it in the resin material, further release of the insect repellent can be realized. For example, after manufacturing a fibrous insect repellent member, the fibrous insect repellent member can be shortened and dispersed in another resin material to further release the insect repellent.

  A binder can be used to disperse or adhere the insect repellent material to the substrate. Disperse the binder in the dispersion medium in which the insect repellent material is dispersed in the resin material that constitutes the base material with the binder re-coated on the surface of the particulate insect repellent material. The substrate can be immersed in the state in which it is left. As the binder, one or more materials selected from the group consisting of silicate, phosphate, methylcellulose, polyvinyl alcohol, acrylic emulsion, and urethane emulsion can be used.

  Examples of silicates include calcium silicate, sodium silicate, potassium silicate, and lithium silicate. In addition to silicates, colloidal silica can also be used. Examples of the phosphate include calcium phosphate, aluminum phosphate, and magnesium phosphate.

(Insect repellent material)
The insect repellent material of this embodiment has a porous material and an insect repellent. The porous material is porous having a pore size of 1 μm or less. For example, pores having a pore size of 1 μm or less (preferably a pore size of 0.5 μm or less) are present in an amount of 20% by volume or more (preferably 30% by volume or more) based on the volume of the porous material. The porous material is made of ceramics or carbon material. Ceramics are metal oxides, metal nitrides, metal carbides, and composites and mixtures thereof. Examples of the porous member made of a carbon material include activated carbon. Insect repellent is supported on a porous material, so that the insect repellent is physically and stably incorporated into the pores. In addition, the presence of pores in the porous improves heat insulation and overheats the insect repellent. It can be assumed that the insect repellent can be continuously released over long-term use conditions.

  The insect repellent is carried in the pores of the porous member. The insect repellent can be firmly bonded to the porous member by being carried in the hole. As a method for supporting in the pores, the porous material is immersed in a state of being dispersed or dissolved in an appropriate dispersion medium. At that time, it can be firmly supported in the pores by supporting it with one or more metal ions selected from the group consisting of silver, copper, iron, nickel, and aluminum. Although the details are not clear, it is considered that the stability can be improved by forming a complex with the insect repellent.

  It is firmly supported by drying after immersion. Drying can be performed by spray drying to obtain a powdery insect repellent material, or the solidified lump after pulverization can be pulverized into powdery particles. It is also possible to immerse the aforementioned base material after the porous material is immersed and supported and then dried as it is.

  The insect repellent is not particularly limited but is preferably a natural material. An example is hiba oil. Moreover, it is preferable that the 1 type (s) or 2 or more types of compound selected from the group which consists of citronellal, carvacrol, tubopsen, and (beta) drablin contained in a natural material is included. This is because these compounds can exhibit an insect repellent action comparable to that of hinokitiol, and are difficult to evaporate and can exist stably over a long period of time. Furthermore, platinum particles having a particle size of nanometer order (for example, particle size of about 10 nm) and vitamin C can be used in combination with an insect repellent.

  EXAMPLES Next, the present invention will be further described with reference to examples, but the present invention is not limited thereto.

(Manufacture of insect repellent materials)
The Hiba oil was supported by immersing it in a 10% by weight aqueous solution of Hiba oil as an insect repellent in a powder (volume average particle diameter 1 μm) of ceramics (cordierite) as a porous material, and then spray drying. Insect repellent material was obtained. Hiba oil was supported at 5% based on the total mass.

(Manufacture of insect repellent members)
A fibrous insect repellent member was produced. Polypropylene was used as the resin material constituting the substrate. Spinning in a state dispersed in polypropylene so that the amount of the insect repellent material added is 0% (comparative example), 3% by mass (Example 1), and 5% by mass (Example 2) based on the total mass. Thus, each test yarn was obtained. The thread thickness was 330 denier.

(Repellent evaluation test)
The repellent effect on mites was evaluated. The evaluation method was performed in accordance with “JIS L Textile Product Mite Prevention Performance Test Method Repellent Test Invasion Prevention Method”.

  Each test sample was prepared by uniformly winding 60 cm of the test yarn of each Example and Comparative Example on a 4 cm square polyethylene plate. Each test sample was placed in a petri dish with a diameter of 9 cm while being placed on a petri dish with a diameter of 4 cm, and the repellent effect of mites was evaluated. In a petri dish with a diameter of 9 cm, a tick medium containing about 10,000 mites is placed under a 4 cm petri dish on which the test sample is placed, and an attracting bait (equivalent of mouse feed and beer yeast is placed in the center of the test sample. 50 mg of the mixture) was placed.

  The number of ticks present on a 4 cm petri dish was measured when allowed to stand at 25 ° C. for 24 hours with a 9 cm petri dish covered. Test conditions were set so that the number of ticks attracted to the 4 cm petri dish of the comparative example slightly exceeded 1000. The sum of the results of five tests is shown below.

  In the control group (comparative example), the total of 5 times was 5658 (100%: repellent rate 0%), whereas in the experimental group of Example 1, 876 animals (15%: repellent rate 85%) were performed. In the experimental group of Example 2, the number was 342 (6%: repelling rate 94%).

  The repellent effect of mites was recognized by dispersing the insect repellent material in the yarn. Moreover, even if the addition amount was 5%, the repellent effect was not saturated, and it was estimated that the effect was increased by further addition.

(Durability test)
A test sample A was prepared by supporting the above insect repellent material on a cordierite honeycomb (porous member) so that the supported amount of hinokitiol was 5% based on the total mass. The loading was carried out by immersing and drying the honeycomb in an insect repellent material dispersed in water.

  An insect repellent member was prepared using the insect repellent material of test sample B in the same manner instead of the insect repellent material of test sample A. Insect repellent material B added metal ions (copper ions) to the solution at 0.5% based on the total mass when supporting the Hiba oil. Copper ions were added as copper sulfate.

  Test samples A and B were placed on a hot air outlet of a futon dryer (manufactured by ZOJIRUSHI, product number RF-AA20). The amount of hinokitiol released by sampling the air blown out every predetermined time was measured.

  As a result, the loading amount of hinokitiol in Test Sample A was 39% of the initial value after 160 hours, while that of Test Sample B was 73% at 160 hours and 70% at 200 hours over a long period of time. It was found that can continue to be released.

  In addition, almost no decrease in hinokitiol was observed in test samples A and B which were stored in the atmosphere without being placed on the outlet of the futon dryer.

  From the above results, it was found that hinokitiol that had disappeared immediately after standing at room temperature in the conventional microcapsules can remain for a long period of time. Further, it was found that clusters containing hinokitiol (hereinafter referred to as “hinoki cluster” or “hinokitiol cluster”) exist in the air blown out from the futon dryer, so that hinokitiol can be released. It was also found that the degree of release can be controlled. It is considered that hinoki clusters are formed by flocculation by hinokitiol released into the air or by flocculation alone or with moisture in the atmosphere. It seems that hinokitiol is charged in the pores of the porous material, which is different from the case where the electronic state exists alone, and has a charge. It is presumed from experimental results that this tendency is strengthened by coexisting with metal ions. It is speculated that the effect of hinokitiol persists because the formation of clusters suppresses contact with oxygen in the atmosphere.

Claims (6)

A porous material made of a ceramic and / or carbon material and having a pore size of 1 μm or less;
An insect repellent having an insect repellent action carried in the pores of the porous material;
Having insect repellent material.   The insect repellent material according to claim 1, wherein the insect repellent is hiba oil.   The insect repellent material according to claim 1 or 2, wherein the insect repellent is one or more compounds selected from the group consisting of citronellal, carvacrol, tubopsen, and β-drabrin.   The insect repellent is dispersed in pores of the porous material together with one or more metal ions selected from the group consisting of silver, copper, iron, nickel, and aluminum. The insect repellent material according to any one of the above. A substrate formed from a fibrous and / or foam-like resin material;
A particulate material comprising the insect repellent material according to any one of claims 1 to 4, wherein the particulate material is dispersed in the substrate and / or adhered to the surface of the substrate.
Insect repellent member.   Between the particulate material and the base material, one or two or more kinds of bonds selected from the group consisting of silicate, phosphate, methylcellulose, carboxymethylcellulose, polyvinyl alcohol, acrylic emulsion, and urethane emulsion are used. The insect repellent member according to claim 5, wherein a dressing is interposed.