JP7088660B2 - Insect repellent paint composition - Google Patents

Description

The present disclosure relates to an insect repellent paint composition that can be applied to the inner and outer wall surfaces of a structure such as a building.

Conventionally, various measures have been taken to protect buildings and other articles from insects such as pests. For example, a coating material for termite control is applied to termites on wood for the purpose of prevention and extermination.
As a coating material for termite control, a composition containing an aqueous resin emulsion, a silane-based water repellent, colloidal silica, and a termite-proofing agent is disclosed (Patent Document 1).

According to the termite control coating material described in Patent Document 1, the safety is high and the effect can be maintained for a long period of time.
Further, a pest repellent coating composition containing a resin emulsion, a pyrethroid compound, a specific inorganic powder, and an organic solvent and having a pH adjusted to a specific range is disclosed (Patent Document 2).

According to the pest repellent paint composition described in Patent Document 2, the pest repellent property does not decrease before and after storage, and stable performance is exhibited even in an environment preferred by pests.

Japanese Unexamined Patent Publication No. 11-256076 WO2016 / 190433 Gazette

However, in Patent Document 1, the described coating composition has a problem that the pest repellent property of the coating film is not sufficient when it is applied after being stored for a long period of time.
Further, in Patent Document 2, although the effect is highly durable, since the inorganic powder is added to the coating composition, the formed coating film hides the color of the base and the like. It may not be possible to paint only the parts that require pest repellent.

That is, since the color of the portion to which this pest repellent coating composition is applied changes, it is necessary to paint more than necessary portion so as not to cause a sense of discomfort around the portion.
Furthermore, since an organic solvent is also added, insects may preferentially gather depending on the type of the organic solvent. Further, this organic solvent is not preferable because many of them contain volatile organic compounds.

The present disclosure is a coating composition comprising a synthetic resin emulsion having a glass transition temperature (hereinafter, Tg) of 5 ° C. or less, a pyrethroid compound, and a matting agent , and the addition amount of the pyrethroid compound is the solid content of the synthetic resin emulsion. On the other hand, the amount of the matting agent added is in the range of 3.0 to 15.0% by weight, and the amount of the matting agent is in the range of 1.0 to 20.0% by weight with respect to the resin component of the coating composition. A matte clear type insect repellent coating composition containing resin beads, diatomaceous earth, calcium carbonate, clay, aluminum oxide, mica, natural crystalline silica, and silica beads alone or in combination of two or more as agents .

From this, it is possible to utilize the color of the object to be coated as it is and to harmonize with the applied part and its surroundings without discomfort, and it does not contain an organic solvent that may hinder the effect of insect repellent. It is an object of the present invention to provide an insect repellent coating composition capable of forming a coating film having a long-lasting effect and excellent handleability and safety.

A coating composition composed of a synthetic resin emulsion having a Tg of 5 ° C. or lower, a pyrethroid compound, and a matting agent , and the amount of the pyrethroid compound added is 3.0 to 15.0 with respect to the solid content of the synthetic resin emulsion. In the range of% by weight , the amount of the matting agent added is in the range of 1.0 to 20.0% by weight with respect to the resin component of the coating composition, and as the matting agent, resin beads, diatomaceous earth, calcium carbonate, clay. By containing aluminum oxide, mica, natural crystalline silica, or two or more types of silica beads alone or in combination of two or more , the color of the object to be coated can be utilized as it is, and the applied part and its surroundings can be harmonized without discomfort. Therefore, it does not contain an organic solvent that may hinder the effect of repellent insects, the effect is long-lasting, and it is possible to form a coating film having excellent handleability and safety.

When the resin solid content of the coating composition is in the range of 5.0 to 30.0% by weight, the applied portion and its surroundings can be more harmonized with each other, and the pest repellent effect is sustained. Can form a better coating film. Further, the gloss of the coating film can be easily adjusted by using a matting agent or the like.

Further, by containing colloidal silica, the adhesion to the inorganic base material is improved, and the drying property of the coating film is excellent.

An embodiment of the present disclosure will be described.
First, the synthetic resin emulsion adheres to the object to be coated when the insect repellent coating composition becomes a coating film, and the additive components such as pyrethroid compounds in the insect repellent coating composition are retained in the coating film. It is an important element to keep.

The synthetic resin emulsion is not particularly limited as long as it has a coating film forming ability, and conventionally known emulsions can be used without limitation.
These include acrylic, urethane, acrylic / urethane, acrylic silicone, silicone, fluorine, epoxy, ester, vinyl, alkyd, and melamine synthetic resin emulsions, which are natural. Commercially available synthetic resin emulsions such as rubbers, synthetic rubbers, and emulsions of their copolymers may be used.

Among these, synthetic resin emulsions such as acrylic resin, acrylic silicone resin, urethane resin, and fluorine resin are preferable from the viewpoint of gloss of the coating film. Further, two or more of these may be used.
The Tg of this synthetic resin emulsion needs to be 5 ° C. or lower.

This Tg is the temperature at which the glass transition of the synthetic resin constituting the synthetic resin emulsion occurs. Generally, in an amorphous solid, the temperature at which the glass transition occurs is called the glass transition point, and in the temperature range above it, it is called the glass transition point. It is in a rubber state, and in a lower temperature range, it is in a glass state. That is, if the temperature is higher than this Tg, the synthetic resin becomes soft, and if it is lower than that temperature, it becomes hard.

Therefore, when the temperature is higher than this Tg, the synthetic resin becomes soft, the water as a solvent evaporates, the particles of the synthetic resin become close to each other, and the particles come into contact with each other, and the softened particles are fused together. However, a film is formed, and a coating film can be formed. Therefore, the synthetic resin emulsion cannot be fused unless the temperature is higher than that temperature, and a coating film formed from the insect repellent coating composition cannot be obtained.

Generally, as a coating condition of a water-based paint containing a synthetic resin emulsion as a main component, the coating atmosphere temperature is 5 ° C. or higher, so that the temperature must be lower than this temperature.
When the temperature is lower than 0 ° C., the amount of evaporation of water, which is the dispersion medium of the synthetic resin emulsion, is small, and it takes time to dry. In addition, since there is a risk of freezing of the insect repellent paint composition, painting while heating is a preferable condition.

The temperature at which the coating film of the insect repellent coating composition using this synthetic resin emulsion is formed is 5 ° C. or lower. The coating film formation can be adjusted with a film-forming auxiliary such as an organic solvent, but the type may affect the viscosity and stability of the paint.
In this case, specific insects may easily gather depending on the type of the organic solvent. In addition, organic chemical substances may volatilize from the coating film formed by the paint, which is not preferable.

The synthetic resin having a Tg of −10 ° C. or higher is preferable, and when the temperature is lower than this temperature, the formed coating film may be sticky and easily soiled.

Next, the pyrethroid compound is an insect repellent component in the present disclosure. By adding this, insects and the like are prevented from approaching the coating film formed by the insect repellent coating composition.
The pyrethroid compound may be a natural pyrethroid compound or a synthetic pyrethroid compound. Examples of this natural pyrethroid compound include pyrethrin, cinerin, and jasmorin.

Synthetic pyrethroid compounds are a general term for synthetic compounds having similar chemical structures to natural pyrethroids, such as allethrin, phthalthrin, empentrin, tetramethrin, α-cypermethrin, resmethrin, prarethrin, imiprothrin, deltamethrin, transfluthrin, and profluthrin. , Metofluthrin, silafluofen, flamethrin, phenothrin, permethrin, cypermethrin, bratrin, etofenprox, cyperthrin and the like, and these can be used alone or in combination of two or more.

Of these, Etofenprox is preferably used. This etofenprox has an ether bond consisting of carbon, hydrogen, and oxygen, is a highly safe insect repellent component such as low irritation to the skin and mucous membranes and low fish toxicity, and is a white crystal powder. The powder can be used as it is, or it can be dispersed with an emulsifier.

This pyrethroid compound is added in the range of 3.0 to 15.0% by weight with respect to the solid content of the synthetic resin emulsion.

If it is less than 3.0% by weight, sufficient insect repellent performance cannot be sufficiently obtained. If it is more than 15.0% by weight, it may not be uniformly dispersed in the insect repellent paint composition, the effect may vary, and the synthetic resin emulsion of the binder component cannot be retained, resulting in the effect. Persistence may be shorter. Further, even if more than 15.0% by weight is added, there is not much difference in the effect.

Further, dispersants such as sulfonates, phosphates, silicates and polyoxyethylene alkyl ethers may be preferably added. By adding a surfactant such as this dispersant, pyrethroid compounds such as Etofenprox can be more evenly mixed in the insect repellent coating composition, and stable insect repellent performance can be obtained.

The surfactant such as this dispersant is not particularly limited, and known ones can be used, but a nonionic surfactant is preferably used from the viewpoint of the stability of the insect repellent coating composition. It is also possible to use a plurality of types.
In addition, various acids such as inorganic acids and organic acids, inorganic alkalis such as sodium hydroxide, and pH adjusters such as various amine compounds are added to adjust the pH of the insect repellent coating composition in the range of 7.5 to 9.0. By adjusting to, the stability will be good.

In addition, coloring components such as coloring pigments and dyes generally added to paints and matting agents such as resin beads can be added, and methyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, polyvinyl alcohol, alkali swelling viscosity modifiers, and inorganic substances can be added. Additives such as viscosity modifiers, viscosity modifiers such as urethane-associated viscosity regulators, antifoaming agents such as silicone-based and mineral oil-based agents, preservatives, and fungicides are appropriately blended as necessary. It can contain components such as antioxidants, ultraviolet absorbers, and light stabilizers.
This insect repellent paint composition is composed of the above-mentioned components, and can be added with a white pigment such as titanium oxide or an extender pigment such as calcium carbonate to change the color of the object to be coated, such as an enamel paint or a matte paint. It can also be in the form.

The insect repellent paint composition of the present disclosure is in the form of a clear paint, and can utilize the color of the object to be coated as it is and can harmonize with the applied portion and its surroundings without discomfort. The effect of repelling insects can be imparted without significantly changing the appearance such as color. In addition, the performance can be imparted only to the part where the insect repellent effect is required, the appearance that is almost the same as before the insect repellent effect is applied is maintained, and the target applied part and its surroundings feel uncomfortable. Can be harmonized without. The color of the base can be expressed as it is, and a coating film having a long-lasting insect repellent effect can be formed without any discomfort.

It is preferable that the gloss of the insect repellent paint composition can be adjusted to obtain a matte clear paint, and a color clear paint can be obtained by using a coloring pigment or a dye.
By preparing the matte clear type insect repellent paint composition in this way, even if the object to be coated has deteriorated over time, the degree of gloss of the object to be coated becomes close to that of the matte clear type insect repellent. Even if it is applied with the coating composition, it can be in a state of no discomfort.

Further, by using a matte color clear type insect repellent paint composition, it is possible to bring it closer to the state of the object to be coated.
Therefore, the resin solid content of the insect repellent paint composition is preferably in the range of 5.0 to 30.0% by weight. Within this range, the insect repellent component can be retained, the effect can be sustained, and the gloss of the coating film formed by the composition can be easily adjusted. In other words, if the resin solid content is within this range, it is a paint that can obtain a sufficiently glossy coating film, and the matting agent described later can be added, and the amount of the matting agent added can be small, whereby the gloss can be obtained. The disappeared coating film can be easily obtained.

When adjusting the gloss of this insect repellent paint composition, the gloss is adjusted by adding a matting agent to the glossy paint. Examples of this matting agent include organic resin beads, inorganic diatomaceous earth, calcium carbonate, clay, aluminum oxide, mica, and silicon dioxide-based compounds such as natural crystalline silica and silica beads, which may be used alone or. Two or more types can be used in combination.

Among these, it is preferable to use resin beads, and in many of these resin beads, the particle size and particle size are stable, the amount of water absorption and the amount of oil absorption are relatively small, and the insect repellent paint composition after addition is stable. Yes, the degree of luster is stable.
The amount of these matting agents added is preferably in the range of 1.0 to 20.0% by weight with respect to the resin component of the insect repellent coating composition, and when it is less than 1.0% by weight, the coating film is coated. If the luster is not sufficiently erased and it is more than 20.0% by weight, the color of the object to be coated may become light and it may not be used effectively.

More preferably, it is in the range of 1.0 to 10.0% by weight, and if it is within this range, the amount of the matting agent added can be suppressed, and the color of the object to be coated is fully utilized. Become.
Further, it is preferable to include colloidal silica in this insect repellent coating composition, whereby the drying property of the coating film is excellent and it is easy to make adjustments for matting.

This colloidal silica is a colloid of silicon dioxide or a hydrate thereof, which usually has a particle size of 10 to 300 nm and does not have a constant structure. It is a sol that does not easily precipitate at room temperature.
Therefore, when the object to be coated is an inorganic substance such as a slate plate, its adhesive force may be further improved, and the drying property of the coating film may be improved. By interspersing fine particles of colloidal silica in the coating film, the gloss of the coating film can be reduced and adjusted.

The content of this colloidal silica is preferably in the range of 3.0 to 20.0% by weight in the solid content of the paint, and if it is less than that range, it may not affect the adjustment of gloss. There may be no effect on the improvement of adhesion to the inorganic substrate, and conversely, in many cases, the stability of the insect repellent coating composition may decrease.

When the object to be coated is applied locally such as a building, the insect repellent coating composition thus configured can be applied by a coating tool such as a roller, a brush, or a spray. Further, although the coating film can be obtained by drying at room temperature, forced drying such as heating can also be performed if necessary.

The object to be coated of this insect repellent coating composition is not particularly limited, and is, for example, wood board, plywood, medium density fiber board, plastic board, cement mortar, concrete board, PC panel, ALC panel. , Slate board, gypsum board, particle board, foam cement board, wood piece cement board, calcium silicate board, etc. Even if they are inorganic materials used for buildings, there are materials such as paper, metal, cloth, etc. These may be painted.

Next, an evaluation method of this insect repellent coating composition will be described.
The following method is used as a general method for evaluating the insect repellent effect.
Two cages made of wire mesh are prepared, and in one cage, a group of adult test insects with a strong desire to suck blood and sugar water soaked in absorbent cotton are placed and allowed to stand overnight or longer.

Inside the other cage, filter paper or veneer board coated with liquid insect repellent is fixed on three sides of the wall surface, the cage is covered with food wrap, and the volatile components are filled, and then with a wire mesh. Suspend the fixed rat on the inner ceiling of the cage.
Both cages are connected by a tubular Saran net to form a treatment area. Using the same test equipment as the treatment group, a test group to which a filter paper or veneer board coated with liquid insect repellent is not installed is set as a control group.

The test insects are allowed to move freely overnight, and the number of stays in the cage and the number of blood sucks in each test plot are counted. Repeat 3 times in each group, and the test is completed when the average blood sucking rate in the control group is 50% or more.
The blood-sucking rate and the retention rate are calculated, and the respective inhibition indexes are calculated from the average blood-sucking rate and the average retention rate by the following formulas. When these indexes are 90 or more, there is a connected cage method that determines that there is an invasion blocking effect or a blood sucking blocking effect, and there are methods such as evaluation of the invasion blocking effect.

In addition, the filter paper coated with liquid insect repellent is used as a treated plate, the same untreated material is used as a control plate, the wire mesh cage is turned upside down, the treated plate is bent 90 ° and fixed diagonally, and the rest. A control plate is similarly fixed diagonally, the upper surface is closed with a transparent glass plate, a group of test insects is introduced into this, and the cage is placed on the floor of the test room under illumination, and the test insects are free. To be active.

The orientation of the cage is changed by 90 ° every 30 minutes, and the test insects moored on the wall surface are photographed every 10 minutes through the glass plate. This operation is performed up to 3 hours after the introduction of the test insect.
The test is repeated 3 times, and the test is completed if the treatment plate and the control plate do not fall off during the test time and the test insects do not escape from the cage.

The number of insects moored every 10 minutes on the processing plate and the control plate is counted from the photographed image, and each mooring prevention index is calculated from the average number of moorings of each plate by the following formula. When this index is 90% or more, there is a single cage imaging that determines that there is an invasion prevention effect or a blood sucking prevention effect, and there is an evaluation of the mooring prevention effect.

Adult Culex pipiens is often used as the test insect in this case, and is intended for mosquitoes.
However, in these methods, the test determines the effect on a specific insect, and is not suitable for measurement in a place where insect repellent is required. Moreover, since the method is also specialized, it cannot be easily performed and there is room for improvement. Therefore, a method for evaluating the effect of insect repellent suitable for the target place is given.

First, a target liquid insect repellent such as an insect repellent paint composition having insect repellent properties is prepared. In addition, prepare a net with a relatively wide opening such as a mesh, and an attractant for attracting insects such as pests.
An insect repellent paint composition is applied to this net and dried to prepare an insect repellent test piece. The effect of the insect repellent coating composition can be evaluated and judged by covering the attractant with this test piece and determining whether the insects approach the attractant.

The liquid insect repellent is an insect repellent coating composition as disclosed in the present disclosure, a general insect repellent, or the like.
Since a net with a relatively wide opening such as a mesh is coated with an insect repellent paint composition, it is preferable that the insect repellent paint composition has good adhesion, and the materials thereof are natural fiber, chemical fiber and glass fiber. It is fibrous like.

This opening is in the range of 2 to 10 mm, allowing insects such as pests to easily pass through, and to secure a certain coating area. If it is smaller than 2 mm, it will not be possible to observe and measure insects larger than that. If it is larger than 10 mm, the coating area of the insect repellent coating composition becomes too small, and it becomes difficult to evaluate the effect.

The attractants for attracting insects such as pests may be those that are likely to attract insects, such as those that generate odors and those that attract insects by light or heat.
The effect of the insect repellent paint composition can be evaluated using these nets and attractants, and in order to make it easier to judge the effect, the net to which the insect repellent paint composition is not applied is covered with the attractant. It is preferable to place only the attractants and the attractants in the same place, compare them, and evaluate them.

As a method for determining this effect, first, a liquid insect repellent such as an insect repellent paint composition is applied to the net. This coating method is not particularly limited, but is generally applied by a spray, a roller, a brush, or the like to which the paint is applied.
An insect repellent is applied to this net and dried, and the test piece is used as a test piece to determine the insect repellent effect. The size of this test piece may be a size that covers the entire attractant.

Cover the entire attractant with the obtained test piece, use it as a test device to see the insect repellent effect, and install it in a place where the insect repellent effect is required. Observe how much insects such as pests approach the installed test equipment.
In this case, there is a space between the attractant and the test piece, and the effect can be evaluated by the number of insects that have entered the space. In addition, the effect can be evaluated by the number of captured insects such as dead insects remaining in the space or in the attractant. If the number of insects caught is large or the number is large, comparison can be made based on the weight of the total number of caught insects.

In this way, when determining the insect repellent effect based on the number of insects captured, it is necessary to kill the insects that have entered the space between the attractant and the test piece without letting them escape, so it is possible to use an insecticidal lamp. preferable. This insecticidal lamp uses light such as blue to attract insects such as pests, place a heating wire around a light source that generates the light, and kill the insects with the heating wire. This insecticidal lamp may be one that is generally sold.

As described above, by installing the test equipment in a place where the effect is required by the method of determining the insect repellent effect, the insect repellent effect according to the place can be easily measured.

Further, the evaluation of the insect repellent effect of the disclosed insect repellent coating composition will be described in detail.
An acrylic synthetic resin emulsion was used as the insect repellent paint composition. The Tg of the acrylic synthetic resin emulsion was 5 ° C., and the minimum film forming temperature was also 5 ° C. The solid content was 47.0% by weight.

For comparison, Tg was 20 ° C. and the minimum film forming temperature was 20 ° C. The solid content used was 47.0% by weight and used in the same manner.
The pyrethroid compound as an insect repellent component was Etofenprox, and an aqueous dispersion having an active ingredient of 50.0% by weight was used.

The resin solid content was adjusted with water, 10.0% by weight and 30.0% by weight were adjusted, and 47.0% by weight was not adjusted, and three kinds of binder components were prepared.
A binder component was prepared in which the amount of the pyrethroid compound added was 5.0% by weight, 15.0% by weight, and 20.0% by weight with respect to the solid content of the synthetic resin emulsion .

As the insect repellent coating composition 1, the resin solid content was adjusted to 10.0% by weight, and the amount of the pyrethroid compound added was adjusted to 5.0% by weight with respect to the solid content of the synthetic resin emulsion .
As the insect repellent coating composition 2, the resin solid content was adjusted to 10.0% by weight, and the amount of the pyrethroid compound added was adjusted to 15.0% by weight with respect to the solid content of the synthetic resin emulsion .

As the insect repellent coating composition A, the resin solid content was adjusted to 10.0% by weight, and the amount of the pyrethroid compound added was adjusted to 20.0% by weight with respect to the solid content of the synthetic resin emulsion .
As the insect repellent coating composition 3, the resin solid content was adjusted to 30.0% by weight, and the amount of the pyrethroid compound added was adjusted to 5.0% by weight with respect to the solid content of the synthetic resin emulsion .

As the insect repellent coating composition 4, the resin solid content was adjusted to 30.0% by weight, and the amount of the pyrethroid compound added was adjusted to 15.0% by weight with respect to the solid content of the synthetic resin emulsion .
The insect repellent coating composition B had a resin solid content of 30.0% by weight, and the amount of the pyrethroid compound added was adjusted to 20.0% by weight with respect to the solid content of the synthetic resin emulsion .

As the insect repellent coating composition 5, the resin solid content was adjusted to 47.0% by weight, and the amount of the pyrethroid compound added was adjusted to 5.0% by weight with respect to the solid content of the synthetic resin emulsion .
As the insect repellent coating composition 6, the resin solid content was adjusted to 47.0% by weight, and the amount of the pyrethroid compound added was adjusted to 15.0% by weight with respect to the solid content of the synthetic resin emulsion .

The insect repellent coating composition C had a resin solid content of 47.0% by weight, and the amount of the pyrethroid compound added was adjusted to 20.0% by weight with respect to the solid content of the synthetic resin emulsion .
As the comparative insect repellent coating composition 1, it was assumed that the resin solid content was 10.0% by weight and Etofenprox was not added. The resin in this case had a Tg of 5 ° C.

The insect repellent paint compositions 1 to 6 adjusted as described above and the insect repellent paint compositions A to C were evaluated. All of these insect repellent paint compositions are clear paints, and the workability was adjusted by adding an antifoaming agent and a thickener in the same manner as general clear paints. The pH was adjusted with a pH adjuster so as to be in the range of 7.5 to 9.0.

Since it was confirmed that the aqueous dispersion Etofenprox was sufficiently mixed with the synthetic resin emulsion, no dispersant or the like was added. In addition, no adjustment was made with a film-forming auxiliary.
Further, the comparative insect repellent paint composition 2 was prepared by using the same composition as the insect repellent paint composition 1 and replacing only the synthetic resin emulsion with one having a Tg of 20 ° C.

The insect repellent paint composition 1 and the insect repellent paint composition 2 for comparison were applied on a release paper with a brush to prepare a coating film. Since the room temperature at the time of preparation was 15 ° C., the coating film of the comparative insect repellent coating composition 2 had cracks, and a sound coating film could not be obtained.
Further, these insect repellent coating compositions were applied to a mesh made of polyester fibers having an opening of 5 mm. In this application method, a mesh was placed on a release paper and applied with a brush on each side. These were dried and used as a test piece. The size of this mesh was such that it could cover the attractant, and was about 25 cm in length and 60 cm in width.

The one to which the insect repellent paint composition 1 was applied was used as the test body 1, and the ones up to the insect repellent paint composition 6 were also carried out in the same manner to prepare the test bodies 1 to 6. Insect repellent paint compositions A to C were also prepared as Test bodies A to C in the same manner. Further, the comparative insect repellent paint composition 1 was used as the comparative test body 1.
For the attractant, we prepared a bug-zapper lamp that is generally sold. The size of this insecticidal lamp was as small as 10 cm in length, 15 cm in width, and 25 cm in height, and the insecticidal lamp used was one that emits blue light from an LED to attract insects.

When each of the obtained insect repellent paint compositions was left in an atmosphere of 50 ° C. for one week, the insect repellent paint compositions A, B, and C in which a relatively large amount of the pest repellent component Etofenprox was added to the resin solid content. However, some aggregates were confirmed.
Eleven insecticidal lamps, which are the attractants, are prepared and covered with the test bodies 1 to 6, the test bodies A to C, and the comparative test body 1 to make a test device, and whether insects can approach the test device. Was measured and evaluated. At the time of the measurement and evaluation, the one without the test piece was installed in the same place.

Eleven test instruments, including those without a test piece, were installed at the measurement site for a certain period of time to capture insects.
By visually observing and measuring the weight of insects captured by each test device, it was judged that the test specimen with few insects had an insect repellent effect.

With the test equipment without the test piece, 0.9 g of insects could be captured. Further, in the comparative insect repellent paint composition 1 to which the pest repellent component Etofenprox was not added, 0.9 g of insects could be obtained, and the number was about the same as visually confirmed.
The test equipment of the test body C coated with the insect repellent paint composition C, the insect repellent paint composition 6, the insect repellent paint composition B, and the test body of the insect repellent paint composition 4 are the obtained insects. It was a small amount of insects that could not be weighed. When visually confirmed, it seems that the number is almost the same, but it seems that the number is small in the order of description.

In the test equipment of the test body 5 to which the insect repellent paint composition 5 was applied, the weight was 0.1 g, and in the case of the insect repellent paint composition A, the weight was 0.2 g. In the case of one, 0.5 g of insects could be obtained.
Those containing the insect repellent ingredient Etofenprox had an insect repellent effect as compared with those containing no insect repellent component. Further, the insect repellent coating compositions B and C to which a relatively large amount of Etofenprox was added were effective but not commensurate with the amount of the addition.

Moreover, since these insect repellent coating compositions do not contain an organic solvent, they do not attract insects on the contrary.
Further, these insect repellent paint compositions were applied to the wall surface of the structure, and the finished condition was confirmed. For the confirmation, the wall surface of the building, which was painted in gray and was slightly deteriorated about 3 years after the painting, was used. Further, the painting was performed by a painting roller.

The insect repellent paint compositions 1 to 4, A to B had no particular problem, and there was no sense of discomfort compared to the unpainted areas, but the insect repellent paint compositions 5, 6 and C were not uncomfortable. Compared to the unpainted area, it was glossy after painting and felt uncomfortable. In addition, there was some tack on the coating film after drying.
According to the insect repellent coating composition according to the present embodiment described above, the following actions and effects can be obtained.

A coating composition composed of a synthetic resin emulsion having a glass transition temperature of 5 ° C. or lower and a pyrethroid compound, and the amount of the pyrethroid compound added is 3.0 to 15.0 with respect to the solid content of the synthetic resin emulsion. Since it is an insect repellent paint composition in the range of% by weight, it is possible to utilize the color of the object to be coated as it is and to harmonize with the applied part and its surroundings without discomfort, and the effect of insect repellent property. It is possible to obtain an insect repellent coating composition that does not contain an organic solvent that may inhibit the above-mentioned substances, has a long-lasting effect, and can form a coating film having excellent handleability and safety.
Further, since the addition amount is in this range, sufficient insect repellent performance can be obtained, and the insect repellent coating composition can be uniformly dispersed.

-By setting the resin solid content of the insect repellent paint composition in the range of 5.0 to 30.0% by weight, it is possible to be more in harmony with the applied portion and its surroundings, and the effect of insect repellent effect is achieved. It is possible to form a coating film having better durability. Further, the gloss of the coating film can be easily adjusted by using a matting agent or the like.
-Since the Tg of the synthetic resin emulsion is −10 ° C. or higher, the formed coating film is less likely to be soiled.

-Because the pyrethroid compound is etofenprox, it is a highly safe insect repellent component with low irritation to the skin and mucous membranes and low fish toxicity, making it even safer.
-By containing colloidal silica, the adhesion to the inorganic substrate is improved, and the drying property of the coating film is excellent. In addition, it is easy to make adjustments for matting.
-Since the content of colloidal silica is in the range of 3.0 to 20.0% by weight in the solid content of the paint, it does not affect the adjustment of gloss and is suitable for inorganic substrates. The adhesion is improved and the stability of the insect repellent coating composition is not affected.

-Since the insect repellent paint composition is in the form of a clear paint, the color of the object to be coated can be utilized as it is, and the applied part and its surroundings can be harmonized without discomfort, and the color of the object to be coated can be used. It is possible to impart the effect of pest repellent without changing its appearance so much. In addition, the performance can be imparted only to the part where the pest repellent effect is required, the appearance that is almost the same as before the insect repellent effect is applied is maintained, and the target applied part and its surroundings feel uncomfortable. Can be harmonized without. The color of the base can be expressed as it is, and a coating film having a long-lasting insect repellent effect can be formed without a sense of discomfort.
-Since the insect repellent paint composition is a matte clear paint, even if the object to be coated has deteriorated over time, the degree of gloss of the object to be coated becomes close to that of the matte clear type pest repellent paint. Even if it is applied to the composition, it can be in a state of no discomfort.

-By using resin beads as the matting agent, the particle size and particle size are stable, and the amount of water absorption and oil absorption is relatively small, so the insect repellent paint composition after addition is stable and the degree of gloss. Will be stable.
-When the amount of the matting agent added is in the range of 1.0 to 20.0% by weight with respect to the resin component of the insect repellent paint composition, the gloss of the coating film is sufficiently erased and the color of the object to be coated is obtained. Can be used effectively without becoming thin.

When the content is in the range of 1.0 to 10.0% by weight, the amount of the matting agent added can be suppressed, and the color of the object to be coated can be fully utilized.
Further, according to the method for evaluating the insect repellent effect according to the present embodiment, the following action effects can be obtained.

-The insect repellent effect can be easily determined by covering the net with the insect repellent paint composition applied to the attractant and evaluating the effect of the insect repellent paint composition depending on whether the insects approach the attractant. Can be done.
-Since the mesh opening of the net is in the range of 2 to 10 mm, insects such as pests can easily pass through, and a certain coating area can be secured.

-In this measurement, it is easier to judge the effect by comparing and evaluating the net with the insect repellent paint composition covered with the attractant or the attractant only in the same place. It will be.
-The effect can be evaluated more easily by evaluating the effect by the space between the attractant and the test body and the number of dead insects remaining in the attractant.

Claims (3)

A coating composition comprising a synthetic resin emulsion having a glass transition temperature of 5 ° C. or less, a pyrethroid compound, and a matting agent .
The amount of the pyrethroid compound added is in the range of 3.0 to 15.0% by weight with respect to the solid content of the synthetic resin emulsion, and the amount of the matting agent added is 1.0 with respect to the resin component of the coating composition. In the range of ~ 20.0% by weight,
A matte clear type insect repellent paint composition containing resin beads, diatomaceous earth, calcium carbonate, clay, aluminum oxide, mica, natural crystalline silica, and silica beads alone or in combination of two or more as a matting agent . The insect repellent coating composition according to claim 1.
A matte clear type insect repellent paint composition in which the resin solid content of the paint composition is in the range of 5.0 to 30.0% by weight. The insect repellent coating composition according to claim 1 or 2.
A matte clear type insect repellent coating composition further containing colloidal silica.