JP7248234B2 - Method for producing wood protective paint - Google Patents

Description

Article 30, Paragraph 2 of the Patent Law applied Published at the Japan Home Show held at Tokyo Big Sight on November 20-22, 2018

TECHNICAL FIELD The present invention relates to a method for producing a wood protective paint (insect repellent paint) used to protect wood from termites and other pests. Termites are a representative pest of wood, but there are other pests that eat wood or live in wood and harm the human body. And so on.

Many measures against termites have been proposed or implemented in wooden houses. Termite countermeasures have been proposed and implemented from various fields, but broadly speaking, there are methods to create an environment that prevents termites from invading buildings, and methods to eliminate termites before they reach structural materials even if they do invade buildings. and a method of exterminating or repelling without causing feeding damage even if it reaches a structural material.

As a method to prevent intrusion into buildings, for example, Yamato termites and Formosan termites prefer environments with high humidity of about 60% and dislike dry environments. is being done. As a method to exterminate even if it invades the building before it reaches the structural materials, it is done by putting anti-termite sheets on the ground under the floor or the surface of discarded concrete, or applying anti-termite agent to the ground under the floor. .

As a method for exterminating termites that have reached the structural material, the structural material is impregnated or coated with an anti-termite agent, or an anti-termite sheet (or anti-termite film) is attached to the outer peripheral surface of the structural material. ing.

On the other hand, an anti-termite treatment agent that is directly applied to wood has also been proposed. For example, Patent Document 1 discloses an anti-termite coating agent composed of powdered charcoal, slaked lime or lacquer, polyvinyl alcohol, and water. Patent Document 2 discloses a mixture of polyvinyl alcohol and natural cypress oil. A coating composition is disclosed. Furthermore, Patent Document 3 discloses impregnating wood with a treatment agent as a composition in which deformed polyvinyl alcohol, a water-soluble boron compound, and colloidal silica are blended.

JP-A-2004-244431 JP 2009-149797 A Japanese Patent Application Laid-Open No. 2001-277207

Since the treatment agents of Patent Documents 1 to 3 are applied directly to wood, they are rational as termite countermeasures. Although it is highly safe for pets, there is undeniable concern as to whether the high anti-termite effect can be maintained over a long period of time at the addition ratio described in the publication.

The present invention has been made in view of such circumstances, and aims to provide a wood protective paint with excellent insect repellent performance at the lowest possible cost.

The present invention relates to a method for manufacturing an insect repellent paint, and this manufacturing method is
" A process of mixing solid polyvinyl alcohol in the form of pellets or other state with warm water of 50 to 60°C to produce an aqueous solution of polyvinyl alcohol;
a step of producing an insect repellent solution by diluting etofenprox with isopropyl alcohol; and a step of mixing the insect repellent solution together with a surfactant into the polyvinyl alcohol aqueous solution cooled to a temperature lower than 35°C. I am prepared .”
It is configured.

The invention of claim 2 is, in claim 1,
The composition is such that " the polyvinyl alcohol is mainly composed of non-denatured polyvinyl alcohol".

The invention of claim 3 is characterized by an insect repellent, and in claim 1 or 2,
" In the process of manufacturing the insect repellent, the same amount of thiamethoxam as the etofenprox is added. "
It is configured.

Etofenprox is fast-acting and slow-acting with thiamethoxam.

In the present invention, it is possible to add an antiseptic agent and an antifungal agent as auxiliary agents in addition to the insect repellent. The amount added in this case can be about 0.5 to 2.0% by weight of the inner coating based on the total wood protective coating. Antiseptics and antifungal agents include, for example, mixtures of methyl-benzimidazol-2-ylcarpamate and organic nitrogen-sulfur compounds.

An anionic surfactant can be used as the surfactant. For example, alkylnaphthalene sulfonate (C4.6, Na.NH4.Ca.amine salt), dodecylbenzenesulfonate (Na.NH4.Ca.Mg.amine salt), dialkylsulposuccinate (C6.8, Na. Ca/Mg salt), fatty acid salt (C12-18, Na/NH4 salt), polyoxyethylene alkylphenyl ether sulfate (C8-9, Na/NH4/Ca/amine salt), polyoxyethylene alkylphenyl ether phosphate ( C8-9, Na.NH4.amine salt), phenolsulfonate (Ca.amine salt), alkanesulfonate (C12-18, Na.Ca.amine salt) and the like can be used. The surfactant may be added in an amount of 1-10% by weight (preferably 2-5% by weight) of the total wood protective coating.

Polyvinyl alcohol (PVA, PVAOH, PVAL: Poval) is also used as a base material for adhesives, and has high adhesion to wood. Therefore, even when the wood protective paint is exposed to the outside, it can be maintained attached to the wood for a long period of time to protect the wood from pests. In addition, since the present invention uses etofenprox, which is a chemical insect repellent, high insect repellent performance can be maintained over a long period of time compared to natural cedarwood oil, boron compounds, and the like.

Therefore, according to the present invention , it is possible to remarkably improve the certainty of protecting wood from pests such as termites over a long period of time. Termites, which are representative pests of wood, have the property of invading from the end face of wood and eating into the inside. There is an advantage that high insect repellent effect can be ensured while suppressing costs by reducing as much as possible.

In addition, in the present invention, since polyvinyl alcohol, which is the main component, is water-soluble, the base softens or dissolves in an environment where termites are likely to invade, for example, when the floor is flooded or rainwater flows in. Insect repellents (anticides) can be penetrated into wood by capillary action. Therefore, in an environment in which termites become more active, the termite-preventing performance can be enhanced, and feeding damage by termites can be reliably and timely prevented. Therefore, the wood protective paint of the present invention is suitable as an anti-termite paint.

Various types of polyvinyl alcohol are provided by many manufacturers, but if non-denatured polyvinyl alcohol is used as in claim 2, a commercial product with a simple composition can be used, which can contribute to cost reduction.

Now, the wood protective paint can be applied to wood with an applicator such as a brush or roller, but it is preferable that the paint has properties that allow it to be applied quickly in an appropriate amount without dripping. In other words, it takes time and effort to apply multiple coatings, and on the other hand, if one coating film is too thick, it will be consumed excessively, which is uneconomical.

Therefore, the base must have an appropriate viscosity, and the viscosity is positively correlated with the degree of polymerization. For wood protection paints, property stability is required to maintain the applied state without excessively dissolving in moisture or water, and it can be said that this property stability is positively correlated with the degree of saponification. Therefore, it can be said that for insect repellent paints, the degree of saponification has an important meaning in terms of the stability of the applied state, and the viscosity has an important meaning in terms of the applicability.

Then, as in the embodiment , when the saponification degree is set to 85 to 90 mol% and the viscosity is set to 20 to 30 mPa s (4%, 20 ° C.), the stability of maintaining the coating state over a long period of time is secured. , it is possible to realize the property that the coating work can be quickly performed to the required thickness without causing the sagging phenomenon. In the manufacturing process of wood protective paints, it is necessary to evenly disperse the insect repellent in the base material. can easily obtain a wood protective coating in which the insect repellent is evenly dispersed.

Polyvinyl alcohol is generally shipped from chemical manufacturers in a solid form such as pellets, and consumers purchase this and mix it with water to liquefy it. % by weight: By setting the blending ratio to 25 to 15% by weight , it is possible to obtain an appropriate viscosity. In particular, it was preferable to set the ratio of polyvinyl alcohol to about 80% by weight and water to about 20% by weight.

Most chemical insect repellents are used as agricultural chemicals or insecticides, and many of them are highly toxic to humans and animals. However, when etofenprox is used as in the present invention , it exhibits high repellency (immediate effect) against pests such as termites while ensuring safety for humans and pets. Therefore , it is suitable as an insect repellent.

When an insect repellent is applied to wood alone or impregnated with it, the active ingredient may gradually diffuse and leak over time, resulting in a decrease in the insect repellent effect. Since the agent is sealed in the base, the insect repellent component hardly radiates, and as mentioned above, when it becomes wet due to immersion in water, etc., the base dissolves and the penetration of the insect repellent into the wood is promoted. Therefore, pests (particularly termites) can be repelled in a timely manner when a thriving environment is created.

The aforementioned thiamethoxam is slow-acting, and even if termites come into contact with it, they do not die on the spot, but die after returning to the nest. and can exterminate other termites in the nest. A major feature of thiamethoxam is that it is extremely safe to humans and pets. By using thiamethoxam, it is possible to achieve both high safety to humans and pets and anti-termite performance.

Thiamethoxam can be used alone, but as in claim 3 , when etofenprox and thiamethoxam are used in combination, the double effect of immediate and delayed action ensures the insect repellent effect (especially the anti-termite effect). It is possible and suitable. Any insect repellent may be added in an amount of about 1000 PPM.

Polyvinyl alcohol dissolves well in hot water, but etofenprox dissolves at 35° C., so it cannot be added to hot water. However, when the water temperature is 35°C or below, the miscibility of isopropyl alcohol with the base is significantly reduced. Therefore, as in claim 4, etofenprox diluted with isopropyl alcohol is mixed with the base together with a surfactant, and the isopropyl alcohol is evenly mixed with the base that has been cooled to a temperature lower than 35°C. be able to. Therefore, by adopting the production method of the present invention , it is possible to easily obtain a wood protective paint having an appropriate viscosity while Ethofenprox is evenly dispersed in a polyvinyl alcohol aqueous solution.

Although the wood protective paint of the present invention can be applied to wood at the building construction site, the on-site application is troublesome in terms of space and manpower. In addition, it is easy to forget to apply it, and it takes some time to dry, which may reduce the efficiency of construction.

In this regard , if the lumber is processed and then coated before it is brought to the site, the work can be done smoothly because it can be simply assembled at the site. If the coating process is carried out at a processing factory, there are fewer space restrictions than at a construction site, so the coating work can be carried out easily and it is easy to check if the coating has been forgotten. Adding a pigment to the wood protective paint to color it is effective in preventing forgetting to apply the wood protective paint, since it is possible to visually confirm whether or not the wood protective paint has been applied. Needless to say, it is possible to carry out the coating work even at the construction site, for example, to apply the coating to a part that has been forgotten to be coated.

It is a perspective view which shows an example of the framework structure of a building (wooden house). Fig. 2 is a partial perspective view of an example of wood;

Next, embodiments of the present invention will be described based on the drawings. FIG. 1 shows an example of a frame structure of a wooden house. The framing structure consists of a group of bases 2 laid down on the upper surface of a concrete foundation 1, a group of first floor main pillars 3 and through pillars 4 erected from the base 2, a group of first floor studs 5, and a first floor A girder 6 and a beam 7 supported by a main pillar 3, through pillars 4 and studs 5 are provided.

The girder 6 and the beam 7 support the main pillar 8 of the second floor and the stud 9 of the second floor. The intersecting bases 2 are connected by a stilt base 10, and the girder 6 and the beam 7 are connected by a stilt beam 11. - 特許庁The pillars 3, 4, 5, 8 and 9 are often connected by braces, which are omitted in the figure.

The pillars 3, 4, 5, 8, 9, the girder 6, and the beam 7 are made of wooden rectangular timbers, and the crossed timbers are connected by a combination of mortises and mortise holes, as shown in Fig. 2(A). In FIG. 2B, the flat tenon 12 and flat tenon 13 are displayed, and the dovetail tenon 14 and dovetail tenon 15 are displayed in FIG. In general, a combination of a flat mortise 12 and a flat mortise hole 13 is used to connect the pillars 3, 4, 5, 8, 9 with the base 2, the girder 6, and the beam 7. uses a combination of dovetail tenon 14 and dovetail tenon hole 15.

The wood protective paint of this embodiment is mainly composed of non-denatured polyvinyl alcohol, and the viscosity is adjusted to 20-30 mPa·s (4%, 20° C.) using raw materials with a degree of saponification of 85-90 mol %. Specifically, first, a commercial product of polyvinyl alcohol in the form of pellets with a degree of saponification of 85 to 90 mol% is purchased, and warm water (50 to 60 ° C.) is added so that the polyvinyl alcohol is 80% by weight and the water is 20% by weight. was added and stirred to prepare a base that was an aqueous solution of polyvinyl alcohol.

On the other hand, using etofenprox as an insect repellent, it is diluted with isopropyl alcohol as a solvent to prepare an insect repellent liquid, and this insect repellent liquid is cooled to a temperature lower than 35°C together with a surfactant (emulsifier). A wood protective paint in which etofenprox was evenly dispersed at a concentration of about 1000 PPM was obtained by adding to and stirring the base and emulsifying (emulsifying) the base. Alkylnaphthalene sulponate (C4.6, Na.NH4.Ca.amine salt) was used as surfactant and was added at 3% by weight in the inner coat.

A mixture of methyl benzimidazol-2-ylcarpamate and an organic nitrogen-sulfur compound was added as an antiseptic/antifungal agent in an amount of about 1%.

The higher the degree of saponification, the higher the water resistance, and it can maintain its adherence to the wood even when the humidity is somewhat high. Therefore, it is possible to protect wood for a long period of time, but on the other hand, when an insect repellent is added, even if the insect repellent is made into an aqueous solution, it may be difficult to mix it with the base material. In this regard, when isopropyl alcohol is used as the solution of the termiticide, the termiticide can be evenly blended because isopropyl alcohol has high miscibility even when the degree of saponification of polyvinyl alcohol is high. Since the ratio of the insect repellent liquid to the base material is very small, it can be said that the addition of the insect repellent liquid causes almost no change in viscosity.

Polyvinyl alcohol is highly soluble in hot water, but etofenprox dissolves at 35° C. and cannot be added to hot water. However, when the water temperature is 35°C or below, the miscibility of isopropyl alcohol with the base is significantly reduced. Therefore, by mixing an intermediate solution obtained by diluting etofenprox with isopropyl alcohol together with a surfactant, it is possible to evenly mix isopropyl alcohol with the base that has been cooled to a temperature lower than 35°C. can. As a result, a wood protective paint in which etofenprox is evenly dispersed in an aqueous polyvinyl alcohol solution can be obtained.

As shown in FIG. 2(A), the wood protective paint can be applied to the end surfaces (cut ends) of wood such as the base 2, the end surfaces of the tenons 12 and 14, and the inner surfaces of the tenon holes 13 and 15 using a brush 16. . In FIG. 2 , the coated portions are shaded. Although not shown in the figure, the base 2 has a bolt hole to be fitted with an anchor bolt, and the bolt hole is formed with a counterbore into which a washer and a nut are inserted. Therefore, a protective paint may be applied to the inner surfaces of the bolt holes and the counterbore.

Furthermore, the piercing base 10 and the piercing beam 11 also have holes 17 for fastening bolts, and it is also possible to apply a protective paint to these holes. Buildings also use square timbers such as joists, furring strips, rafters, and eaves girders, as well as board materials such as floorboards, wallboards, and ceiling boards. is good.

It is possible to apply wood protective paint to the entire surface of wood such as square timbers and planks. Even without it, it can be said that feeding damage by termites can be prevented simply by applying it to the end faces of wood ends and the inner surfaces of mortise holes.

When the wood protective paint is applied to the wood with the brush 16, if a paint with a viscosity of 20 to 30 mPa·s (4%, 20°C) is used as in the embodiment, it can be applied to an appropriate thickness without causing sagging. Therefore, by applying several coats while leveling, it is possible to quickly apply an appropriate amount without causing sagging.

The wood protective paint of this embodiment can be used not only on end surfaces such as the butt end of wood, but also on gaps between wood joints and cracks on the surface of wood. In addition to building materials such as structural materials, interior materials, and exterior materials for buildings, for example, core boards (substrates) of tatami mats, furniture, outdoor equipment (such as benches), posts for wooden protective fences, etc. It can be widely applied to wood used for various purposes such as beams and railway sleepers. When used for the core plate of tatami mats, it can prevent the occurrence of small pests such as mites, fleas, and lice, thereby forming a comfortable indoor environment.

It should be noted that the wood protective paint of this embodiment has a higher viscosity than commercially available spray paints for color coating, so it is difficult to apply by spraying using compressed gas. Therefore, it is preferred to use a brush for application. Although it is possible to apply with an air gun using compressed air, the use of an air gun causes the insect repellent paint to scatter around the target area, which is not preferable from the point of view of work environment and economy. Therefore, it is preferable to apply with a brush (or writing brush).

The present invention can actually be embodied in a wood protective coating. Therefore, it can be used industrially.

1 Concrete foundation 2 Foundation 3,4,5,8,9 Column 6 Girder 7 Beam 10 Base 11 Beam 12,14 Tenon 13,15 Mortise hole

Claims (3)

A step of mixing solid polyvinyl alcohol in the form of pellets or other state with warm water of 50 to 60° C. to produce an aqueous polyvinyl alcohol solution;
a step of producing an insect repellent solution by diluting etofenprox with isopropyl alcohol; and a step of mixing the insect repellent solution together with a surfactant into the polyvinyl alcohol aqueous solution cooled to a temperature lower than 35°C. equipped with
A method for producing a wood protective coating. The polyvinyl alcohol is mainly composed of non-denatured polyvinyl alcohol ,
A method for producing a wood protective coating according to claim 1. The same amount of thiamethoxam as the etofenprox is blended in the process of manufacturing the insect repellent liquid,
3. A method for producing a wood protection paint according to claim 1 or 2.

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