JP2020033426A - Termite-proofing coating composition for wood, and manufacturing method of termite-proofing coating composition for wood - Google Patents

Abstract

To provide a termite-proofing coating composition excellent in safety and termite-proofing property, capable of forming a coated film excellent in quality, and capable of stably holding performance for long time, and a manufacturing method of the termite-proofing coating composition.SOLUTION: A coating as one example of the termite-proofing coating composition has a composition containing 100 pts.wt. of a coating composition, 0.3 to 3.0 pts.wt. of furfural, 1 to 3 pts.wt. of a liquid wood carbonized article, 8 to 12 pts.wt. of a charcoal powder, 15 to 25 pts.wt. of an aqueous emulsion resin of an alkyl acrylate styrene copolymer (solid amount about 50%), 8 to 12 pts.wt. of calcium carbonate, 1 to 5 pts.wt. of aluminum hydroxide, 0.2 pts.wt. of 50% sodium hydroxide, 2 pts.wt. of 5% sodium hydroxide, 30 to 40 pts.wt. of water and 0.5 to 3 pts.wt. of an antifoam agent or the like.SELECTED DRAWING: None

Description

  The present invention relates to a coating composition for wood and a method for producing the coating composition for wood. More specifically, a wood coating composition and a method for producing a wood coating composition capable of forming a coating film having excellent safety and termite preservative properties and excellent quality and capable of stably maintaining performance for a long period of time It is related to.

  Conventionally, as an antiseptic and preservative measure for wood for housing structures, one or more kinds of agents having repellent and insecticidal effects against termites and agents having an antibacterial or bactericidal effect against wood rot fungi are applied to wood. That is being done.

  These chemicals are used by being mixed with a coating composition applied to wood, and exert their termitic and preservative effects by being applied to the surface of wood or penetrating into wood.

  As the chemicals used in such a wood coating composition, for example, pyrethroids, carbamates, nicotinoids (see, for example, Patent Document 1) and the like are present, and pesticide components serving as insecticides are widely used. .

JP 2008-255092 A

  However, chemicals used in conventional wood coating compositions, including the wood coating composition disclosed in Patent Literature 1, are toxic treatment agents for the human body depending on the amounts used.

  In addition, workers who apply the wood coating composition may inhale high concentrations of chemicals during work, and health hazards due to long-term exposure of residential residents to the chemicals used in the structural materials of the housing. It is a problem.

  In addition, some of the drugs used in the past include drugs that cause sick house syndrome. Exists.

  In addition, since wood for housing structures is used for a long period of time, the paint applied to the wood can stably maintain the state of the coating film while ensuring the termite and antiseptic properties. Required.

  Furthermore, when applying the coating composition for wood, it is necessary to consider the dispersibility of the active ingredient that causes the termite and preservative properties of the coating and the ease of application to wood.

  The present invention has been made in view of the above points, has excellent safety and termite preservative properties, can form a coating film having excellent quality, and can stably maintain performance for a long period of time. An object of the present invention is to provide a coating composition for wood and a method for producing the coating composition for wood.

  In order to achieve the above object, a wood coating composition of the present invention comprises an active ingredient containing at least a first active ingredient that is an oily component derived from nature and a second active ingredient that is a wood distillate. And a charcoal powder whose surface is lipophilic and an aqueous resin component.

  Here, the first active ingredient, which is an oily component derived from nature, makes it possible to impart termite and antiseptic properties to the composition. Moreover, since it is a component derived from nature, its toxicity is lower than that of drug components used as conventional insecticides, and safety can be improved. Further, since it is an oily component, it is easy to suppress the outflow from the wood due to the influence of wind, rain, moisture and the like after application to the target wood.

  In addition, the second active ingredient, which is a wood distillate, can provide the composition with termite and antiseptic properties. In addition, since it is a wood distillate, it is less toxic than drug components used as conventional insecticides, and can enhance safety. Further, since it is an oily component, it is easy to suppress the outflow from the wood due to the influence of wind, rain, moisture and the like after application to the target wood.

  In addition, the active ingredient contains at least a first active ingredient that is an oily component derived from nature and a second active ingredient that is a wood distillate, thereby enhancing the effects of termites and preservatives, For example, a plurality of different effects can be imparted to the composition. That is, for example, with respect to termite control, by adopting an immediate-acting component as the first active component and a slow-acting component as the second active component, for a long period immediately after application, the termiticide is used. Characteristics can be stably maintained.

  In addition, the charcoal powder allows the aqueous resin component to have thickness and strength as an aggregate in the composition, and can adsorb odors, chemical substances, moisture, and the like.

  In addition, since the surface of the charcoal powder is lipophilic, the first active ingredient and the second active ingredient, which are oily components, are adsorbed on the surface of the charcoal powder and can be retained.

  Further, the first active ingredient which is an oily component, the second active ingredient which is a wood distillate, and charcoal powder whose surface is lipophilic, the first active ingredient and the second active ingredient are provided on the surface of the charcoal powder. The active ingredient is adsorbed, and a hydrophilic group having a smaller ratio than the lipophilic group on the surface of the charcoal powder can easily act on moisture. That is, the first active ingredient and the second active ingredient can be held by the charcoal powder, and can be easily dispersed in the aqueous resin component.

  The aqueous resin component is a main component of the coating film in the composition. That is, the aqueous resin component connects the particles of the charcoal powder to form a coating film.

  In addition, when the charcoal powder has a carbon ratio of 95% or more, the charcoal powder becomes excellent in oil absorbency, and the surface thereof easily becomes lipophilic, and the first active ingredient and the second active ingredient are further increased. Can be improved in adsorbability and retention.

In addition, when the specific surface area of the charcoal powder is 50 m ² / g or less, the surface area is increased, and the carbon structure is likely to appear on the surface. As a result, the surface of the charcoal powder tends to be lipophilic, and the adsorptivity and retention of the first active ingredient and the second active ingredient can be further enhanced.

When the charcoal powder has a carbon ratio of 95% or more and a specific surface area of 50 m ² / g or less, the surface of the charcoal powder is more likely to become lipophilic, and the first The adsorptivity and retention of the active ingredient and the second active ingredient can be improved.

  In addition, when the charcoal powder includes the first charcoal powder and the second charcoal powder having a particle diameter of 2.5 to 5 times the particle diameter of the first charcoal powder, the paint is When applied to wood, small-sized charcoal powder enters between large-sized charcoal powders, increasing the uniformity of the filling state of charcoal particles and filling the charcoal powder per unit area. Rate can be improved. In addition, since the filling rate of the charcoal powder in the paint is improved, the amount of the active ingredient adsorbed on the surface is also increased, and the termite and preservative properties can be enhanced with a smaller amount of the paint.

  In addition, since the uniformity of the filling state of the charcoal particles is enhanced, the coating surface of the paint is uniform (the film thickness is uniform), and the film forming property, the flexibility, the surface contamination, and the surface scratch adhesion are excellent. It can be. In addition, the appearance of the coating film can be improved. In addition, the strength of the coating film can be increased by increasing the contact area between the charcoal particles.

  Further, since the coating surface of the paint becomes uniform, the charcoal particles are less likely to fall off after application than in the case where charcoal powder having a single particle size (average particle size) is blended in the paint.

  Furthermore, compared to the case where the charcoal powder having a single particle size was blended into the paint, the charcoal powder having a different particle size was dispersed in the paint, so that the viscosity of the paint was increased, and the paint was stored or placed. In this case, sedimentation of the charcoal powder having a large particle diameter hardly occurs. That is, the storage stability is improved.

  Here, when the particle size of the second charcoal powder is less than 2.5 times the particle size of the first charcoal powder, the charcoal powder having a small particle size is placed between the charcoal powders having a large particle size. And it becomes difficult to make the filling state of the charcoal powder uniform. Accordingly, the performance of the coating film is not sufficiently improved. In addition, the particle size of the second charcoal powder is close to the particle size of the first charcoal powder. As a result, the density of the mixed charcoal powder is reduced, and the improvement of the coating film strength is insufficient.

  Further, when the particle size of the second charcoal powder exceeds five times the particle size of the first charcoal powder, gaps between the powder particles of the second charcoal powder are likely to occur, and the density of the mixed state is reduced. And the improvement of the coating film strength becomes insufficient. In addition, unevenness of the surface between the powder particles of the second charcoal powder is likely to occur, making it difficult to uniform the filling state of the charcoal powder. Accordingly, the performance of the coating film is not sufficiently improved.

  When the first charcoal powder is a powder having a center particle diameter of 10 μm and the second charcoal powder is a powder having a center particle diameter of 2.5 μm, the state of filling the charcoal particles in the paint is further improved. The uniformity can be improved, and the filling rate of charcoal powder per unit area can be improved. As a result, the amount of the active ingredient adsorbed on the surface of the charcoal powder in the paint further increases, and the termite and preservative properties can be enhanced with a smaller amount of the paint. Note that the central particle size of 10 μm here does not mean a numerical value of strictly 10 μm, but means, for example, a central particle having a width in the range of 8 to 12 μm. Similarly, the central particle size of 2.5 μm here does not strictly mean a value of 2.5 μm, but means, for example, a range with a central particle size of 2 to 3 μm. Further, the central particle size referred to herein can be a value measured by a known particle size measuring device or a central particle size determined by a sieving test method specified in JIS8815.

  When the proportion of the first charcoal powder and the second charcoal particles is in the range of 1: 1 to 1: 2, the dispersibility of the charcoal powder in the coating composition is excellent, and The composition can easily maintain stable quality for a long period of time. In addition, the handleability during coating and the coating properties are improved. Further, after application to the target wood, the coating composition becomes more difficult to flow out of the wood.

  Here, regarding the ratio of the blending amount of the first charcoal powder and the second charcoal particle, when the first charcoal powder is 1 and the second charcoal particle is less than 1, the viscosity of the paint is high. Become. As a result, when applied to the target wood, striations and streaks are likely to be formed on the applied surface, and the appearance of the coating film deteriorates.

  When the ratio of the first charcoal powder to the second charcoal particle is 1 and the second charcoal particle exceeds 2, the first charcoal powder is applied to the target wood. In addition, the coating composition tends to flow out of wood due to the influence of climatic conditions and the like.

  In addition, when the glass transition temperature Tg is in the range of −40 ° C. to −30 ° C., the aqueous resin component can be a paint that can follow the expansion or shrinkage of wood due to a temperature change or a dry change. Further, a flexible paint can be obtained even in a low temperature environment.

  When the composition contains a flame retardant composed of calcium carbonate and aluminum hydroxide, the flame retardancy of the paint can be improved.

  Further, when the first active ingredient contains at least one of furfural, creosote, cresol, neem oil, pyrethrum, hinokitiol, camphor wood essential oil, limonite, and the second active ingredient contains guaiacol, Combination of the first effective component which has immediate effect in termite repellent performance and the antiseptic property against rot fungi, and the second active ingredient which has a delayed effect. It is easy to maintain the character.

  When the first active ingredient contains furfural, and the compounding ratio of the first active ingredient is in the range of 0.5 to 3.0 parts by weight based on 100 parts by weight based on the total amount, In addition, the composition can have a sufficient antiseptic and antiseptic properties, and the coating composition can be made less likely to flow out of wood.

  Here, if the compounding ratio of the first effective component is less than 0.5 part by weight with respect to 100 parts by weight based on the total amount, the repelling performance becomes insufficient, and the coating composition cannot be converted from wood. It will be easy to leak. Further, when the mixing ratio of the first effective component exceeds 3.0 parts by weight with respect to 100 parts by weight based on the total amount, the aqueous resin component is easily separated after the production. In addition, dents and small holes are likely to be formed in the coating film immediately after coating, making it difficult to form a coating film having a uniform thickness.

  When the second active ingredient contains guaiacol, and the compounding ratio of the second active ingredient is within a range of 1 to 3 parts by weight based on 100 parts by weight of the total amount, termite and preservative are used. The composition can have sufficient properties and the coating composition can hardly flow out of the wood.

  Here, if the blending ratio of the second effective component is less than 1 part by weight with respect to 100 parts by weight based on the total amount, the repelling performance becomes insufficient and the coating composition flows out of the wood. It will be easier. Further, when the mixing ratio of the first effective component exceeds 3 parts by weight with respect to 100 parts by weight based on the total amount, the aqueous resin component is easily separated after production. Further, the viscosity of the coating composition increases, which affects the applicability and stability. In addition, dents and small holes are likely to be formed in the coating film immediately after coating, making it difficult to form a coating film having a uniform thickness.

  Further, in order to achieve the above object, the method for producing a wood coating composition of the present invention comprises a first active ingredient that is a naturally derived oily component and a second active ingredient that is a wood distillate. Mixing the first active ingredient and the second active ingredient on the charcoal powder by mixing a charcoal powder having a lipophilic surface with the mixture obtained in the first step. And a third step of mixing the mixture of the second step with the aqueous resin component and dispersing the mixture of the second step in the aqueous resin component.

  Here, in the first step, by mixing the first active ingredient, which is an oily component derived from nature, and the second active ingredient, which is a dry distillate of wood, the effects of termite and preservative properties are obtained. It is possible to enhance or impart a plurality of different benefits to the composition. That is, for example, with respect to termite control, by adopting an immediate-acting component as the first active component and a slow-acting component as the second active component, for a long period immediately after application, the termiticide is used. Characteristics can be stably maintained.

  In the second step, the mixture of the first step is mixed with charcoal powder whose surface is lipophilic, and the first active ingredient and the second active ingredient are adsorbed on the charcoal powder, whereby the oily property is improved. The first active ingredient and the second active ingredient as components are adsorbed on the surface of the charcoal powder and can be retained.

  The third step is to mix the particles of the charcoal powder with the aqueous resin component by mixing the mixture of the second step and the aqueous resin component and dispersing the mixture of the second step in the aqueous resin component, A coating film can be formed on wood to be coated.

  In addition, when the charcoal powder is formed by carbonizing wood at a temperature of about 1,100 degrees, the lipophilicity of the charcoal powder surface is reduced by reducing hydrophilic groups such as carboxyl groups and hydroxyl groups on the surface of the wood carbide. Can be increased. As a result, it is possible to improve the efficiency of adsorbing the first active ingredient and the second active ingredient, which are oily components, on the surface of the charcoal powder.

In addition, when the charcoal powder has a carbon ratio of 95% or more and a specific surface area of 50 m ² / g or less, the charcoal powder becomes excellent in oil absorbency, and the surface thereof easily becomes lipophilic, Further, the adsorptivity and the retention of the first active ingredient and the second active ingredient can be improved. In addition, the surface area of the charcoal powder is increased, and the carbon structure easily appears on the surface. As a result, the surface of the charcoal powder tends to be lipophilic, and the adsorptivity and retention of the first active ingredient and the second active ingredient can be further enhanced.

  In addition, the first step has a first pretreatment step of mixing the first active ingredient and the second active ingredient with a 50% sodium hydroxide solution, so that the first active ingredient which is an oily ingredient is obtained. And a hydrophilic group can be provided to the second active ingredient.

  Further, the first step has a second pretreatment step of mixing the mixture of the first pretreatment step with a 5% aqueous sodium hydroxide solution, so that the first active ingredient provided with the hydrophilic group and the second The two active ingredients can be efficiently adsorbed and retained on the surface of the charcoal powder.

  The first step is a first pretreatment step of mixing the first active ingredient and the second active ingredient with a 50% sodium hydroxide solution, and 5% water is added to the mixture of the first pretreatment step. By having the second pretreatment step of mixing with the aqueous sodium oxide solution, the first active ingredient and the second active ingredient, which are oily components, can be easily dispersed in the aqueous resin component. That is, the first active ingredient and the second active ingredient adsorbed and held on the surface of the charcoal powder are easily dispersed in the aqueous resin component by the hydrophilic groups contained therein. As a result, the charcoal powder holding the first active ingredient and the second active ingredient can be stably dispersed in the aqueous resin component.

INDUSTRIAL APPLICABILITY The wood coating composition according to the present invention has excellent safety and termite preservative properties, can form a coating film of excellent quality, and can stably maintain its performance for a long period of time.
Further, the method for producing a wood coating composition according to the present invention is excellent in safety and termite preservative properties, can form a coating film of excellent quality, and can stably maintain performance for a long period of time. It is a method capable of producing a coating composition for use.

  Hereinafter, the composition of an example of the wood coating composition to which the present invention is applied will be described. The composition shown below is merely an example of the present invention, and the content of the present invention is not limited thereto.

  The paint shown here is based on 100 to 100 parts by weight of the coating composition, 0.3 to 3.0 parts by weight of furfural, 1 to 3 parts by weight of liquid wood distillate, and 8 to 12 parts by weight of charcoal powder. 15 to 25 parts by weight of an aqueous emulsion resin of an alkyl acrylate / styrene copolymer (solid content: about 50%); 8 to 12 parts by weight of calcium carbonate; 1 to 5 parts by weight of aluminum hydroxide; 0.2 parts by weight of 50% sodium hydroxide, 2 parts by weight of 5% sodium hydroxide, 30 to 40 parts by weight of water and 0.5 to 3 parts by weight of paint additives such as defoamers Has a composition.

  Furfural is an example of the first active ingredient in the present invention, and is a naturally derived oily active ingredient that imparts a termitic and antiseptic effect to a coating composition and exhibits immediate repellent performance. Further, the amount of furfural is preferably 0.3 to 3.0 parts by weight based on 100 parts by weight of the coating composition.

  In the present invention, in addition to furfural as a first active ingredient, natural oil-based termite preservatives such as creosote, cresol, neem oil, pyrethrum (natural pyrethrin), hinokitiol, kusunoki essential oil, limonite, etc. And these can be used alone or in combination of two or more.

  The liquid wood distillate is the second active ingredient in the present invention and contains terpenes, fatty acids, aliphatic alcohols, and phenol components (guaiacol) containing acetic acid as a main component. Is given. Guaiacol is a naturally derived oily active ingredient that exhibits delayed repellent performance. In addition, it is preferable that the compounding amount of the liquid wood distillate is 1 to 3 parts by weight based on 100 parts by weight of the coating composition.

  Further, it is preferable that the liquid wood dry matter contains 1 to 3% of guaiacol, which is an antiseptic component. Since the guaiacol is stably contained, the liquid wood fraction is preferably a wood fraction derived from conifers. The conifers are, for example, cedar, red pine, black pine, larch, hemlock, hinoki, hiba and the like.

  The charcoal powder is an aggregate (inorganic pigment) that gives the resin (coating film) a thickness and strength, and is a component that adsorbs and holds furfural and liquid wood distillate. In addition, the charcoal powder gives the paint a function of adsorbing odors, chemical substances, moisture, and the like.

  In the present paint, two types of charcoal powders having different particle diameters are blended. The charcoal powder having a small particle diameter (the first charcoal powder in the claims of the present application) has a central particle diameter of about 2.5 μm (central particle diameter). Contains particles of about 1 to 3 μm). The charcoal powder having a large particle diameter (the second charcoal powder in the claims of the present application) has a center particle diameter of about 10 μm (including particles having a center particle diameter of about 8 to 12 μm).

  In addition, in the above wood coating composition, the blending of the charcoal powder having a small particle diameter and the charcoal powder having a large particle diameter is 4.8 parts by weight with respect to 100 parts by weight of the coating composition. Here, in the present invention, the compounding amount of the entire charcoal powder is preferably 8 to 12 parts by weight based on 100 parts by weight of the coating composition.

  Further, in the present invention, the particle diameter of the charcoal powder having a large particle diameter is two times smaller than that of the charcoal powder having a small particle diameter. It is preferably from 0.5 to 5 times, and more preferably the particle size of the charcoal powder having a large particle size is four times the particle size of the charcoal powder having a small particle size.

  Further, in the present invention, it is preferable that the ratio of the charcoal powder having a small particle diameter to the charcoal powder having a large particle diameter be in the range of 1: 1 to 1: 2.

In the present invention, the charcoal powder is a carbide baked at about 1100 ° C., and has a carbon ratio of 95% or more and a specific surface area of 50 m ² / g or less.

  In addition, as the charcoal powder, for example, white charcoal baked at about 1100 ° C. from a tree of the genus Hypericum perforatum (Miyu, no Japanese name) as a raw material can be used. The charcoal powder may be, for example, white charcoal produced by baking Ubamegashi at a high temperature of about 1100 ° C. and then quenching with an appropriate amount of ash and soil. Bincho charcoal is a typical example of white charcoal.

  An aqueous emulsion resin (solid content: about 50%) of an alkyl acrylate / styrene copolymer is a main component of the coating composition. As a main component of the coating film, it connects the particles of charcoal powder with each other and forms a coating. Form a film. The aqueous emulsion resin of the alkyl acrylate / styrene copolymer has a glass transition temperature (Tg) of -40 to -30C. Here, the solid content of about 50% is a numerical value indicating the mixing ratio of the remaining components excluding the water contained in the resin to the components of the entire aqueous emulsion resin.

  Calcium carbonate and aluminum hydroxide are flame retardants for improving the flame retardancy of paints. Calcium carbonate is an agent that inhibits combustion because it does not burn. Aluminum hydroxide is an agent that causes a dissociation reaction of water of crystallization at a temperature of 200 ° C. or higher and generates an endothermic effect at the dissociation reaction.

  50% sodium hydroxide is a solution used for pretreatment for imparting hydrophilic groups to furfural and liquid wood distillate. 5% sodium hydroxide is a solution used for pretreatment for efficiently adsorbing and holding furfural and liquid wood distillate treated with 50% sodium hydroxide on the surface of charcoal powder. In addition, by these pretreatments, the charcoal powder to which furfural and the liquid wood distillate are adhered can be easily dispersed in the aqueous emulsion resin of the alkyl acrylate / styrene copolymer.

  Water is a solvent that mixes and disperses each component. Water is also the base of the paint.

  Here, in the present coating material, each compounding raw material and compounding ratio are not limited to those described above, and each component and compounding amount can be appropriately changed without departing from the function required for the present invention.

  Further, the aqueous coating composition in the present coating composition is not necessarily limited to an aqueous emulsion resin of an alkyl acrylate / styrene copolymer. For example, as the aqueous coating composition, in addition to the emulsion type acrylic resin, types such as acrylic lacquer, baked acrylic, water-soluble acrylic, acrylated alkyd, and the like can be used. Emulsion type acrylic resin is an emulsion polymer which is frequently used for building interior materials and is obtained by emulsion polymerization of a monomer such as an acrylate ester in water.

  In the present coating composition, the charcoal powder of the present coating does not necessarily have to be limited to white charcoal, and white charcoal and black charcoal can be used in combination. It is also conceivable to use a mixture of white charcoal and black charcoal from the viewpoint of improving the physical properties, flexibility and filling rate of the coating film.

  Also, the raw material of the charcoal powder does not necessarily have to be limited to a tree of the genus Ochrysaceae (Miyu, no Japanese name). For example, it is possible to employ Ubamegashi, Aracashi, Oak, and the like, which are known raw materials that become white coal. In the case of black charcoal, raw materials such as oak, oak, oak, oak, pine, and pine can be used as raw materials.

In addition, the charcoal powder of the present paint is not necessarily limited to two types having different particle diameters. For example, an embodiment in which three or more types of charcoal powders having different particle sizes (center particle size) are mixed may be used. . However, it is preferable to use two types of charcoal powders having different particle sizes from the viewpoint that the control of uniformity of the coating film by adjusting the blending amount becomes complicated and the production cost increases.
No.

  Further, calcium carbonate and aluminum hydroxide need not necessarily be blended in the present coating composition. However, it is preferable that calcium carbonate and aluminum hydroxide are added to the present coating composition from the viewpoint that the flame retardancy of the coating film surface of the coating can be improved.

  Further, in the coating composition to which the present invention is applied, if necessary, in addition to the above-described composition, other components can be appropriately blended without departing from the effects of the present invention. For example, it is also possible to separately add an additive component such as a thickener, a preservative, a fungicide, an antifoaming agent, and a flame retardant that improves the functionality of the paint.

  An example of a method for producing a wood coating composition to which the present invention is applied will be described in detail. The manufacturing method described below is merely an example of the present invention, and the contents of the present invention are not limited thereto.

  First, in order to disperse furfural, which is an oily active ingredient, and liquid wood distillate in an aqueous emulsion resin of an alkyl acrylate / styrene copolymer, a primary pretreatment step is performed using a 50% thorium hydroxide solution of the mixture of the active ingredients. I do.

  This primary pretreatment step can impart a hydrophilic group to the oily active ingredient, and can be easily dispersed in water. For example, as a specific primary pretreatment step, 1 PHR of a 50% sodium hydroxide solution is mixed with 10 PHR of a mixed solution of an active ingredient obtained by mixing furfural and liquid wood distillate, followed by stirring.

  Next, in order to efficiently hold and support the active ingredient on the charcoal powder, about 5% of sodium hydroxide solution 100PHR is mixed with the active ingredient 10PHR that has undergone the primary pretreatment step, and the active ingredient is mixed. Is evenly dispersed in water (secondary pretreatment step).

  Thereafter, 30 PHR of charcoal fine powder (a mixture of two types of charcoal powders having different center particle diameters) is added to the above solution, followed by stirring and mixing. By this step, the lipophilic group of the active ingredient subjected to the secondary pretreatment step is preferentially adsorbed on the surface of the lipophilic charcoal, and the active ingredient is retained on the surface of the charcoal base material. Since the tip of the active ingredient on the surface of the charcoal is a hydrophilic group, the active ingredient is stably dispersed in water.

  Subsequently, an aqueous emulsion resin is mixed with the mixture of the active ingredient and the charcoal powder such that the resin solids amount becomes 20 PHR with respect to the paint wet of 100 PHR.

  Furthermore, as paint, 100 to 5 PHR of paint, 8 to 12 PHR of extender calcium carbonate, 1 to 5 PHR of aluminum hydroxide, and 0.5 to 3 PHR of various paint additives such as defoamer are added to 100 PHR of paint to improve flammability. I do.

  Through the above steps, a wood coating composition to which the present invention is applied can be manufactured. In the above method, a hydrophilic group is imparted to the active ingredient by a primary pretreatment step of mixing the oily active ingredient with a 50% sodium hydroxide solution, so that the active ingredient can be efficiently applied to the surface of the lipophilic charcoal powder. It can be retained, and the dispersibility in an aqueous resin component can be increased.

  In addition, the active ingredient having the hydrophilic group can be efficiently adsorbed and retained on the surface of the charcoal powder by the secondary pretreatment step of mixing the mixture of the primary pretreatment step with a 5% aqueous sodium hydroxide solution.

  By such a method, the oily active ingredient is sufficiently adsorbed and held on the charcoal powder as the aggregate, and is dispersed in the aqueous emulsion resin, whereby a coating composition having excellent antiseptic and termite resistance can be produced. .

  As described above, the wood coating composition to which the present invention is applied is excellent in safety and termite preservative properties, can form a coating film of excellent quality, and can stably maintain performance for a long period of time. It has become.

  Hereinafter, embodiments of the present invention will be described.

Samples of Examples and Comparative Examples of paints to which the present invention was applied were prepared and evaluated as follows.
(1) Raw Material Components of Sample In the contents described below, various tests were performed using the composition of the coating composition shown in Table 1 as a “basic composition”. In addition, Examples and Comparative Examples were prepared by changing the amount of a specific compounding material depending on the content of the test, and changes from the basic compounding are clearly indicated in the corresponding items. The aqueous emulsion resin of the alkyl acrylate / styrene copolymer has a solid content of about 50%, and uses Ultrasol manufactured by Aika Kogyo Co., Ltd.

(2) Examination of aggregate type (charcoal powder and zeolite)
First, raw materials were added so as to have the compositions shown in Table 2, and samples of Examples 1 to 3 and Comparative Examples 1 to 5 were produced. In each of the samples of Examples 1 to 3 and Comparative Examples 1 to 5, the mixing ratio between the two components of the charcoal powder having the central particle diameter of 10 μm and the central particle diameter of 2.5 μm was changed or the charcoal was changed. The test was performed with a composition in which powder and zeolite were replaced.
For Examples 1 to 3 and Comparative Examples 1 to 5, the results of various tests of Test Nos. 1 to 7 described below are shown in Table 3 for samples without a weather resistance test. Table 4 shows the results of performing various tests of Test Nos. 1 to 3 described below on samples having a weather resistance test with respect to Comparative Examples 1 to 5.
In (2) shown in this paragraph, a comparison was made between "charcoal powder (single particle size component and mixed component of two types of particle size)" and "zeolite" as components that become aggregates in the coating composition. .

[Termite-control efficacy test]
Each sample was tested for termiticidal efficacy with reference to the Japan Wood Preservation Association Standard No. 11, "Testing method for termite-controlling efficacy of wood termiticide for application, spraying and immersion (1) Laboratory test method". A test body was prepared by applying the coating composition of each material to a surface of a 20 × 10 × 10 mm piece of wood, equivalent to 300 g / m ² . A test container, 150 termites and 15 soldiers were placed in a test container (plastic petri dish), and the termite-control performance of termites was tested for three weeks in a dark place at 28 ° C.
In addition, a comparative test was also performed with a test piece which was subjected to a weathering operation (30 seconds in water, 4 hours in a desiccator filled with water at the bottom of the container, and 20 hours in a constant temperature bath at 40 ° C. 20 times. In a typical test, the number of repetitions of the weathering operation was 10 times, but in this test, in order to confirm the effect of retaining the active ingredient of the aggregate, the test was performed 20 times more than the usual number of operations.
The termiticidal effect was evaluated by termite mortality (80% or more) (test number 1) and weight loss rate (less than 3%) (test number 2) of the test specimens after 3 weeks. In addition, based on the weight loss rate and the mortality rate, the termite control judgment of each sample was evaluated in three grades of ○ (good), Δ (somewhat good), and × (poor) (test number 3).

[Paint stability and workability]
With respect to the coating composition of each sample, the container was stopped after stirring the sample, and after the elapse of a required time, the presence or absence of precipitation on the bottom of the container and the properties (viscosity) of the coating were confirmed. Using a plastic spatula (width 2 cm, thickness 2 mm), the presence or absence of the charcoal sediment at the bottom of the container and the viscosity were examined. The evaluation was performed under a temperature condition of 25 ° C. ± 2. The above-mentioned evaluation was evaluated as three items of “paint stability”, ie, （(no precipitation and no viscosity increase), Δ (clay rise), and × (precipitation) [Test No. 4].

  In addition, after the preparation of each sample, after storage at -10 ° C for one week or at 50 ° C for one week in a dark place, the presence or absence of precipitation on the container bottom and the properties (viscosity) of the paint were confirmed. The evaluations in this paragraph were evaluated as “low-temperature stability (test No. 5)” or “high-temperature stability (test No. 6)” as items of ○ (no or little precipitation) and × (precipitation). It was evaluated on a scale.

  Furthermore, after the preparation of each sample, the coating workability (painting workability, appearance of the finished coating film) was also confirmed. The evaluation in this paragraph was evaluated as two items of “painting workability (paper surface number 7)”: ○ (good workability) and × (precipitation during work or rough coating film).

  As shown in Table 3, in the case of no weathering operation, in Examples 1 to 3 and Comparative Examples 1 to 5, the mortality was 100%, and the weight loss rate of the specimen was suppressed to less than 3%. Termite control results were good. In Examples 1 and 2, good results were obtained in all of the paint stability, low-temperature stability, high-temperature stability and coating workability. Further, in Example 3, although an increase in the viscosity was confirmed with respect to the paint stability, good results were obtained in all of the low-temperature stability, the high-temperature stability and the coating workability.

  Further, as shown in Table 4, even in the case where the weathering operation was performed, in all of Examples 1 to 3, the mortality was 100%, and the weight reduction rate of the test specimen was suppressed to less than 3%. Gave good results. On the other hand, in Comparative Examples 3 to 5, the mortality rate decreased and the weight loss rate of the test specimen exceeded 5%, and a decrease in the termiticidal effect was confirmed.

  From the above results, as a kind of the aggregate, the charcoal powder having a central particle diameter of 10 μm and the charcoal powder having a different particle diameter of the central particle diameter of 2.5 μm are blended to obtain a good termite-controlling effect and an aggregate. It has been clarified that a stable coating composition in which is not easily precipitated can be obtained.

(3) Mixing ratio of charcoal powder having different particle diameters Raw materials were added so as to have the composition shown in Table 5, and samples of Examples 1 to 5 and Comparative Examples 1 and 2 were produced. In each of the samples of Examples 1 to 5 and Comparative Examples 1 and 2, a test was conducted by changing the blending ratio between the two components of the charcoal powder having a central particle diameter of 10 μm and a central particle diameter of 2.5 μm in the above basic mixture. Was done.
Table 6 shows the results of the various tests of Test Nos. 1 to 7 performed on the samples without the weather resistance test with respect to Examples 1 to 5 and Comparative Examples 1 and 2, and Examples 1 to 5 and Comparative Example 1 Table 2 shows the results of the various tests of Test Nos. 1 to 3 performed on the samples having the weather resistance test for Nos. 1 to 2.
In (3) shown in this paragraph, regarding "charcoal powder (single particle size component and mixed component of two types of particle size)" in the coating composition, a charcoal powder having a large particle size and a charcoal having a small particle size are used. The comparison was performed by changing the mixing ratio of the powder.

  As shown in Table 6, in the case of no weathering operation, in each of Examples 1 to 5 and Comparative Examples 1 and 2, the mortality was 100%, and the weight loss rate of the test specimen was suppressed to less than 3%. Termite control results were good. In Examples 1, 2, and 4, good results were obtained in all of the paint stability, low-temperature stability, high-temperature stability, and coating workability. Further, in Examples 3 and 5, although an increase in viscosity was confirmed with respect to paint stability, good results were obtained in all of low-temperature stability, high-temperature stability and coating workability.

  Further, as shown in Table 7, even in the case where the weathering operation was performed, the mortality rate was 100% in all of Examples 1 to 5, the weight reduction rate of the test specimen was suppressed to less than 3%, and the termite control judgment was made. Gave good results.

  In particular, in the samples of Example 4 (large particle size: small particle size = 2: 1) and Example 2 (large particle size: small particle size = 1: 1), the weight loss rate without the weather resistance operation was low. It was the most excellent, and also showed an excellent result of less than 2% in the weight loss rate with the weathering operation.

(4) Mixing ratio of furfural Each raw material component was added so as to have the composition shown in Table 8, and samples of Examples 6 to 11 and Comparative Example 6 were produced. In each of the samples of Examples 6 to 11 and Comparative Example 6, a test was performed by fixing the compounding amount of tar to 2 PHR and changing the compounding amount of furfural in the range shown in Table 8 in the above basic compounding. . The total amount of the coating composition was adjusted by changing the amount of water in accordance with the change in the amount of furfural.
For Examples 6 to 11 and Comparative Example 6, the results of the repelling performance for each time passage shown below, the results of performing the various tests of Test Nos. 1 and 2, and the results of the comprehensive repelling performance were performed. Are shown in Tables 9 and 10. Table 9 shows the results for the samples without the weathering test, and Table 10 shows the results for the samples with the weathering test.

[Test on repellent performance]
Judgment test of repellency performance of each sample was conducted with reference to the Japan Wood Preservation Association Standard No. 11 "Testing method of wood-termitic repellent for coating, spraying and dipping (1) Laboratory test method". . The test body was prepared by applying a coating composition of each material equivalent to 300 g / m ^{2 on} the surface of a 20 × 10 × 10 mm piece of wood. A test container, a 150-year-old house termite and 15 soldier ants were put into a test container (plastic dish), and the test period of the termite repelling performance was set to 3 weeks in a dark place at 28 ° C. Observation of the repelling performance was performed immediately after the start of the test, 1 hour, 3 hours, 12 hours, 24 hours, and 3 weeks. The appearance of the test body after 3 weeks and the weight change of the test body after 3 weeks were checked. Was measured.
In addition, as a weathering operation, a test specimen was immersed in water for 30 seconds, repeated for 4 hours in a desiccator filled with water at the bottom of the container, and repeated for 20 hours in a constant temperature bath at 40 ° C. for 10 times, and a comparison test was performed with or without the weathering operation Was done.
The test results of the repelling performance over time were evaluated in three stages: 〇 (termites did not approach), △ (less than 15 termites approached), and × (15 or more termites approached) (test number) 8). Further, based on each result, the comprehensive judgment repelling performance was evaluated in two stages of （(good) and × (bad).

  As shown in Table 9, in the case where there was no weathering operation, in Examples 6 to 11, in the period from immediately after the start of the test to three weeks later, the repelling performance was favorable in all samples. Further, in all of Examples 6 to 11, the mortality was 100%, and the weight loss rate of the test specimen was suppressed to less than 3%.

  In addition, as shown in Table 10, in the case where the weathering operation was performed, in Examples 7 to 11, in the period from immediately after the start of the test to three weeks after, the repelling performance was favorable in all samples.

(5) Mixing Ratio of Wood Distillate The raw materials were added so as to have the composition shown in Table 11, and samples of Examples 12 to 17 and Comparative Example 7 were produced. In each of the samples of Examples 12 to 17 and Comparative Example 7, the amount of furfural was fixed to 1 PHR and the amount of tar (wood distillate) was changed in the range shown in Table 11 in the above-mentioned basic formulation. The test was performed. The total amount of the coating composition was adjusted by changing the amount of water in accordance with the change in the amount of tar.
Tables 12 and 13 show the results of performing various tests of Test Nos. 1 to 3 on Examples 12 to 17 and Comparative Example 7 as termite control efficacy tests. Table 12 shows the results for the samples without the weathering test, and Table 13 shows the results for the samples with the weathering test. The number of repetitions of the weathering operation was set to 10.

  As shown in Table 12, in the case without the weathering operation, in each of Examples 12 to 17, the mortality was 100%, and the weight loss of the test specimen was suppressed to less than 3%. .

  In addition, as shown in Table 13, in the case where the weather-resistant operation was performed, in all of Examples 3 to 17, the mortality was 100%, and the weight loss rate of the test specimen was suppressed to less than 3%. It became.

(6) Flame retardancy Each of the samples of Examples 18 to 26 and Comparative Examples 8 to 13 was prepared by adding the raw material components so as to have the compositions shown in Tables 14 and 15. In each of the samples of Examples 18 to 26 and Comparative Examples 8 to 13, the following flammability test was performed by changing the amounts of calcium carbonate and aluminum hydroxide in the ranges shown in Tables 14 and 15 in the above basic composition. Was done. The total amount of the coating composition was adjusted by changing the amount of water in accordance with the change in the amount of calcium carbonate and aluminum hydroxide.

[Test on flammability]
For each of Examples 18 to 26 and Comparative Examples 8 to 10, as a flammability test, each of the prepared samples was applied on a gypsum board of 15 × 30 cm at 300 g / m ² , and the dry burner was separated from the test body by 20 cm. Put the burner on. The burner was ignited, and after 30 seconds, 1 minute, and 2 minutes, damage to the coating film surface, smoke, and gas generation were confirmed.
In addition, the results of the flammability test were as follows: ○ (no damage, smoke, or gas generated on the coating surface after 2 minutes), △ (damage, smoke, or gas on the coating surface after 2 minutes) The evaluation was made in three stages of those where slight generation was observed) and x (where damage, smoke and gas generation were observed on the coating film surface within 2 minutes).

  As shown in Tables 14 and 15, in Examples 18 to 26, no damage was generated on the coating film surface and no smoke or gas was generated even after 2 minutes. On the other hand, in Comparative Examples 8 to 13 in which only calcium carbonate or only aluminum hydroxide was blended, the results did not contribute to the improvement of flammability.

The present invention relates to a termite-control coating composition for wood and a method for producing the termite-control coating composition for wood. Specifically, excellent safety and anti-termite antiseptic, and can form a coating film excellent in quality, long-term, stable wood termiticide coating composition capable of holding the performance and termiticide coating compositions for wood It relates to a method of manufacturing a product.

The present invention has been made in view of the above points, has excellent safety and termite preservative properties, can form a coating film having excellent quality, and can stably maintain performance for a long period of time. and to provide a method for producing wood termiticide coating compositions and wood termiticide coating composition.

The wood termite- preventive coating composition according to the present invention has excellent safety and termite-preservative properties, can form a coating film of excellent quality, and can stably maintain performance for a long period of time. I have.
In addition, the method for producing a wood termite- preventive coating composition according to the present invention is excellent in safety and termite-preservative properties, can form a coating film of excellent quality, and can stably maintain performance for a long period of time. It is a method capable of producing a novel wood termite coating composition.

As described above, the termite-control coating composition for wood to which the present invention is applied has excellent safety and termite-preservative properties,
A coating film having excellent quality can be formed, and performance can be stably maintained for a long period of time.

Claims (16)

An active ingredient containing at least a first active ingredient that is at least a naturally derived oily ingredient, and a second active ingredient that is a wood distillate;
Charcoal powder whose surface is lipophilic,
A wood coating composition comprising an aqueous resin component. The charcoal powder is a carbon of 95% or more, and, wood coating composition according to claim 1 having a specific surface area of not more than 50 m 2 / ^g. The said charcoal powder was comprised including the 1st charcoal powder and the 2nd charcoal powder which has a particle size of 2.5-5 times of the particle size of this 1st charcoal powder. Item 6. A wood coating composition according to Item 2. The first charcoal powder is a powder having a central particle diameter of 10 μm,
The coating composition for wood according to claim 3, wherein the second charcoal powder is a powder having a central particle diameter of 2.5 µm. The coating composition for wood according to claim 4, wherein the ratio of the compounding amount of the first charcoal powder and the second charcoal particles is in the range of 1: 1 to 1: 2. The coating composition for wood according to claim 1, wherein the aqueous resin component has a glass transition temperature Tg within a range of −40 ° C. to −30 ° C. 7. The wood coating composition according to claim 1, 2, 3, 4, 5, or 6, wherein the aqueous resin component is an aqueous emulsion resin of an alkyl acrylate / styrene copolymer. . The wood coating composition according to any one of claims 1, 2, 3, 4, 5, 6, and 7 comprising a flame retardant composed of calcium carbonate and aluminum hydroxide. . The first active ingredient comprises at least one of furfural, creosote, cresol, neem oil, pyrethrum, hinokitiol, camphor wood essential oil, limonite,
The said 2nd active ingredient contains guaiacol. The coating composition for wood according to claim 1, claim 2, claim 3, claim 4, claim 5, claim 6, claim 7, claim 7 or claim 8. . The said 1st active ingredient contains furfural, and the compounding ratio of the said 1st active ingredient is in the range of 0.5-3.0 weight part with respect to 100 weight part of a total amount reference | standard. The coating composition for wood according to claim 2, claim 3, claim 4, claim 4, claim 5, claim 6, claim 7, claim 8, or claim 9. The said 2nd active ingredient contains guaiacol, The compounding ratio of the said 2nd active ingredient is in the range of 1-3 weight part with respect to 100 weight part of a total amount reference | standard. The coating composition for wood according to claim 3, claim 4, claim 5, claim 5, claim 6, claim 7, claim 8, claim 9, or claim 10. A first step of mixing a first active ingredient that is a naturally derived oily ingredient and a second active ingredient that is a wood distillate;
A second step of mixing charcoal powder whose surface is lipophilic with the mixture of the first step, and adsorbing the first active ingredient and the second active ingredient on the charcoal powder;
A third step of mixing the mixture of the second step with the aqueous resin component and dispersing the mixture of the second step in the aqueous resin component. The wood according to claim 12, wherein the charcoal powder is formed by carbonizing wood at a temperature of about 1,100 ° C, has a carbon ratio of 95% or more, and has a specific surface area of 50 m ² / g or less. A method for producing a coating composition for use. The first step includes:
A first pretreatment step of mixing the first active ingredient and the second active ingredient with a 50% sodium hydroxide solution;
A second pretreatment step of mixing the mixture of the first pretreatment step with a 5% aqueous sodium hydroxide solution,
The method for producing a wood coating composition according to claim 12 or 13, wherein the second step comprises mixing the charcoal powder with the mixture of the second pretreatment step. The said charcoal powder was comprised including the 1st charcoal powder and the 2nd charcoal powder which has a particle size of 2.5-5 times of the particle size of this 1st charcoal powder. A method for producing a wood coating composition according to claim 13 or 14. The first charcoal powder is a powder having a central particle diameter of 10 μm,
The method for producing a wood coating composition according to claim 15, wherein the second charcoal powder is a powder having a center particle size of 2.5 µm.