JP6025537B2 - Wood primer and primer method - Google Patents

Description

  The present invention relates to a method of repainting a wood protective agent on wood treated with the wood protective agent. More particularly, the present invention relates to an undercoating method when re-coating an impregnated type or semi-film-forming type wood protective agent on wood for outdoor use treated with an impregnated type, semi-film-forming type or film-forming type wood protective agent.

Wood is used in various applications such as civil engineering and construction and general industrial use, but wood deteriorates due to decay, mold, pests, or burning by sunlight. In particular, building materials such as houses and buildings, and wood used outdoors such as benches in parks, etc., are subject to severe deterioration due to outdoor exposure, so they can be treated with wood preservatives to protect the wood. It is done.
Wood protective agents include “impregnated type wood protective agent” in which the active ingredient penetrates inside and exerts the effect from the inside, “film-forming type wood protective agent” that covers the surface with a protective agent film and protects the wood, and its An intermediate type “semi-film forming type wood protective agent” is known.

  The film-forming type wood protective agent is intended to protect the wood from external enemies such as ultraviolet rays, rain, bacteria and pests by creating a film on the surface, and to exert a protective effect for a long time. In the case of a film-forming type wood protective agent, a film is formed on the surface of the wood, so the grain is not visible and the natural texture and texture of the wood are lost. Has occurred and the appearance is impaired. Furthermore, there has been a problem that it takes time to remove the deteriorated coating film when the protective composition is re-applied after the coating film has deteriorated.

  On the other hand, the impregnated type wood protective agent is the one in which the protective component penetrates into the inside of the wood and tries to exert the effect from the inside, and the grain is visible after painting and the texture of the wood is not lost. You can enjoy the touch as it is. In the case of an impregnated wood protective agent, unlike the film-forming type, coating film peeling and cracking do not occur, but since the protective agent itself deteriorates with time, regular maintenance is required to maintain the effect. Repainting is necessary.

  Even when impregnated or semi-filmed dip wood protective agents are used, especially when used on outdoor wood, deterioration due to outdoor exposure is severe. The brightness was lost and it was difficult to maintain the wood grain and natural texture. Even if you use a base treatment agent that removes mold and dirt using chemicals such as oxidants, dullness due to lignin cannot be removed, so the brightness that wood originally had cannot be restored. It was. If we tried to force it back, we had to use more powerful chemicals or scrape the wood surface, which would inevitably increase costs. For such wood used outdoors, there is no known technique for maintaining the grain and natural texture of the wood by repainting an impregnation type or semi-film type wood protective agent.

JP-A-10-203902 JP 2002-137206 A

The present invention seeks to solve the problems of the prior art.
The present invention is applied after painting an impregnated or semi-impregnated wood protective agent and after re-coating when repainting an impregnated or semi-impregnated type wood protective agent on wood treated with a wood protective agent. Furthermore, the present invention provides a primer and a primer method that can maintain the brightness of a new wood and maintain the grain and natural texture of the wood.
The present invention is particularly suitable for undercoating when re-applying an impregnation type or semi-film-forming type wood protective agent to wood for outdoor use treated with an impregnation type, semi-film-forming type or film-forming type wood protective agent. And a primer method are provided.

The present invention comprises (A) a hydrocarbon resin and / or 1 to 30% by mass of a modified hydrocarbon resin obtained by modifying the resin with a polyvalent carboxylic anhydride, and (B) 1 to 40 % by mass of a room temperature curable thermosetting resin. , (C) Preservative 0-10% by mass, (D) White pigment, 1-50% by mass of at least one component selected from mica and amorphous silica, and (E) Diluent remaining amount Provide a primer for use.

The present invention also provides a method of applying the wood primer described above to wood.
A method in which the wood is a wood treated with a wood protective agent and the above-described wood primer is applied to wood is a preferred embodiment of the present invention.

  The present invention further includes a method of further applying an impregnated type or semi-impregnated type wood protective agent to the wood coated with the primer by the above-described method, and an impregnated type or semi-impregnated type wood protective agent by the method. Provide wood.

In accordance with the present invention, after painting impregnated or semi-impregnated wood protective agent, and after repainting when re-coating impregnated or semi-impregnated type wood protective agent on wood treated with wood protective agent Also, a primer is provided that keeps the brightness of new wood and maintains the wood grain and natural texture of the wood.
According to the present invention, there is provided an undercoating method that makes it possible to maintain the grain and natural texture of wood after re-coating when re-coating an impregnated or semi-impregnated type wood protective agent on wood treated with a wood protective agent. Provided.

The present invention provides at least selected from (A) a hydrocarbon resin and / or a modified hydrocarbon resin obtained by modifying the resin with a polyvalent carboxylic anhydride , ( D) a white pigment, mica, and amorphous silica. one component, provides a method for applying a and (B) a solvent system comprising a cold curing type thermosetting resin, and optionally (C) a preservative or aqueous-based primer. The primer of the present invention is at least selected from (A) a hydrocarbon resin and / or a modified hydrocarbon resin obtained by modifying the resin with a polyvalent carboxylic anhydride , ( D) a white pigment, mica, and amorphous silica. one component, a and (B) cold-setting thermosetting resin, and optionally (C) primer solvent-based or aqueous systems contain a preservative.

  Examples of the hydrocarbon resin (A) used in the present invention include aliphatic petroleum resins, aromatic petroleum resins, aliphatic-aromatic petroleum resins, and hydrides thereof. The hydrocarbon resin preferably has a softening point of 60 to 150 ° C., preferably 80 to 150 ° C. by the ring and ball method (according to JIS K2207-1990), and the hydrocarbon resin is graft-modified with a polyvalent carboxylic anhydride. Modified hydrocarbon resin may also be used.

  Aromatic petroleum resins are obtained by polymerizing a mixture of various heavy fractions having a boiling point of about 150 to 280 ° C. after separation and acquisition of various light fractions from crude pyrolysis oil in the presence of a Friedel-Crafts catalyst. A pale yellow to brown low crystalline or amorphous solid obtained in this manner. Aromatic petroleum resins are hydrophobic and oleophilic in the state obtained from the polymerization process, which contributes to the improvement of the water repellency of wood and is compatible with wood. It has the effect of fixing inside and preventing leaching.

  The mixture of various heavy fractions described above contains vinyltoluenes, α-methylstyrene, divinylbenzenes, and indenes, etc., but the coexistence ratios thereof vary considerably, so that the resulting aromatic system The properties of petroleum resins are also diverse. As the aromatic petroleum resin, for example, “Petrogin 120” (manufactured by Mitsui Chemicals, Inc.) having a ring and ball softening point of around 120 ° C. is suitable. Hydrogenated petroleum resins can also be used.

  The aliphatic petroleum resin is a copolymer of an aliphatic diolefin mainly composed of 5 carbon atoms such as piperylene and isoamylene and a cyclic conjugated diene mainly composed of 5 carbon atoms such as cyclopentadiene. It is a light-colored resin with excellent weather resistance.

  The aliphatic-aromatic petroleum resin is, for example, a copolymer of isopropenyl toluene, an aliphatic diolefin mainly composed of 5 carbon atoms, and a cyclic conjugated diene mainly composed of 5 carbon atoms, It has excellent weather resistance and is the lightest color resin.

  Examples of the modifier for the hydrocarbon resin include acid anhydrides of polyvalent carboxylic acids such as maleic anhydride, hexahydrophthalic anhydride, and norbornene dicarboxylic acid anhydride. The content of the modifying agent in the modified hydrocarbon resin is 0.01 to 0.5 mass%, preferably 0.03 to 0.1 mass%, based on the modified hydrocarbon resin.

  The room temperature curable thermosetting resin (B) of the present invention is an oxidation polymerization type thermosetting resin or a moisture curable type thermosetting resin. Oxidation polymerization type thermosetting resins are alkyd resin, urethane alkyd resin, epoxy ester resin, etc. containing oil in molecule, moisture curable type thermosetting resin is polyurethane resin having isocyanate group, alkoxysilane in molecule A two-component curable epoxy / amine resin, a two-component curable polyol / polyisocyanate resin, and the like.

  As the room temperature curable thermosetting resin (B), urethane alkyd resin and moisture curable polyurethane resin are excellent in terms of performance, but urethane alkyd resin is preferable from the viewpoint of workability.

  Urethane alkyd resins are transesterified with vegetable oils such as safflower oil and dehydrated castor oil and polyhydric alcohols such as glycerin and polyglycol diol. The resulting resin. There are also resins obtained by copolymerizing urethane blocks and alkyd blocks, and block resins obtained by urethanizing alkyd resins. A urethane alkyd resin in which TDI is used as a diisocyanate is preferable because of its good drying property, chemical resistance, water resistance, and abrasion resistance. Examples of other isocyanates used for modification include xylylene diisocyanate having high weather resistance. Urethane alkyd resins marketed under trademarks such as “Barnock” (Dainippon Ink Co., Ltd.) and “Arachid” (Arakawa Chemical Co., Ltd.) can also be used. A medium oil type, a long oil type, or a super long oil type with a high oil content is preferred.

The preservative (C) used in the present invention represents a component that imparts antiseptic properties to wood, and includes components for imparting antibacterial properties, fungicidal properties, insect repellent properties, and the like. is there. These are collectively referred to as preservatives for convenience.
Therefore, in the present invention, various preservatives, fungicides, insecticides, antiseptic / antifungal agents and the like can be blended.

  As preservatives, phenolic, organic iodine, naphthenic acid metal salt, hydroxylamine, naphthalene, quinoline, anilide, haloalkylthio, nitrile, benzothiazole, quaternary ammonium salt, benzimidazole, Mention may be made of triazoles, pyrethroids and thiocyanates. Pyrethroid-like refers to a compound that is not structurally a pyrethroid but exhibits the same effects as the pyrethroid. The typical preservative is illustrated below.

Phenol type: Triphenylphenol, p-bromo-2,5-dichlorophenol, (phenylalkyl) phenols represented by p- (2-phenyl-isopropyl) phenol (p-cumylphenol),
Organic iodine system: 4-chlorophenyl-3-iodopropargyl formal (IF-1000), 3-ethoxycarbonyloxy-1-bromo-1,2-diiodo-1-propene (“Sanplus”), 3-iodo-2 -Propenyl butyl carbamate (IPBC, "Troysan"),

Naphthenic acid metal salt: copper naphthenate, zinc naphthenate,
Hydroxylamine series: N-nitroso-N-cyclohexylhydroxylaminealuminium (“Xylazane AL”), N-nitroso-N-cyclohexylhydroxylamine potassium,
Naphthalene series: Monoclonal naphthalene (monochloro naphthalene),
Quinoline series: 8-oxyquinoline ("oxin"),
Anilide series: N-methoxy-N-cyclohexyl-4- (2,5-dimethylfuran) carboanilide, 3-isopropoxy-3′-trifluoromethylcarboanilide,

Haloalkylthio system: N, N-dimethyl-N ′-(dichlorofluoromethylthio) sulfamide, tetrachloroethylthiotetrahydrophthalimide,
Nitrile type: Tetrachloroisophthalonitrile,
Benzothiazole series: 2-mercaptobenzothiazole, 2- (thiocyanomethylthio) benzothiazole (TCMTB),
Quaternary ammonium salt system: Didecyldimethylammonium chloride, benzalkonium chloride,
Benzimidazole series: 2- (4-thiazolyl) benzimidazole (TBZ),

Carbamate series: 2- (4-chlorophenyl) -3-cyclopropyl-1- (1,2,4-triazol-1-yl) butane-2-diol (“cyproconazole”), 1- (p-chlorophenyl) ) -4,4-dimethyl-3- (1,2,4-triazol-1-yl) methylpentan-3-ol (tebuconazole),
Pyrethroid-like: 2- (p-ethoxyphenyl) -2-methylpropyl-3-phenoxybenzyl ether (ethofenprox),
Thiocyanate series: alkylene bis (thiocyanates) represented by methylene bis thiocyanate (MBT).

  Among them, phenols with various substituents introduced have the ability to penetrate and stay inside wood (non-eluting and low exudation), odorless, while maintaining the antibacterial and antifungal properties of phenols. It has good properties, environment and low impact on human livestock, and is suitable. Specifically, a hydroxyl group is bonded to one aromatic nucleus of two aromatic nuclei constituting the antiseptic / antifungal molecule, and an alkylene group (particularly a branched alkylene group may be used) is bonded to the other aromatic nucleus. Is a phenyl branched alkylphenol in which both aromatic nuclei (aryl groups) are bonded via an alkylene group.

  A particularly preferred specific example is p- (2-phenylisopropyl) phenol (p-cumylphenol). As the p-cumylphenol, one having a p-isomer content of 60% by mass or more, preferably 80% by mass or more, and most preferably 90% by mass is used.

  Other potent preservatives are 3-iodo-2-propenylbutyl carbamate (IPBC, “Troysan”), 2- (4-chlorophenyl) -3-cyclopropyl-1- (1,2,4-triazole-1- Yl) butane-2-diol (cyproconazole), 1- (p-chlorophenyl) -4,4-dimethyl-3- (1,2,4-triazol-1-yl) methylpentan-3-ol (tebuconazole) ), 2- (p-ethoxyphenyl) -2-methylpropyl-3-phenoxybenzyl ether (ethofenprox), methylenebisthiocyanate (MBT). They are well adapted to the applied wood and last for a long time. Of course, these can be used together.

The following mixed preparation marketed as a wood antifungal agent can also be used.
Antifungal agent (TIC): 2- (4-thiazolyl) benzimidazole (TBZ) + 2- (thiocyanomethylthio) benzothiazole (TCMTB),
Antifungal agent (BIC): 3-iodo-2-propenylbutylcarbamate (IPBC, “Troysan”) + 2- (thiocyanomethylthio) benzothiazole (TCMTB), antifungal agent (BAM): 2- (thiocyanomethylthio) Benzothiazole (TCMTB) + methylene bis thiocyanate (MBT),
Antifungal agent (NM): methylene bis thiocyanate (MBT) + 4-chlorophenyl-3-iodopropargyl formal (IF-1000).

Examples of the white pigment used in the present invention include titanium white (titanium dioxide), zinc white (zinc oxide), red lead, lithopone, precipitated barium sulfate, barite powder, and the like. Titanium) and zinc white (zinc oxide) are preferred.
The average particle diameter of these white pigments is preferably 0.01 to 20 μm, and more preferably 0.1 to 10 μm. The particle diameter can be determined as an average single particle diameter by electron micrograph.
You may use a white pigment as a paste about 50-70 mass% of solid pigments.

As the mica of the present invention, natural muscovite or synthetic mica can be used. There is no particular limitation on the average particle size and aspect ratio (particle size / thickness) of mica, but the average particle size is preferably about 0.1 to 40 μm, preferably about 0.1 to 20 μm. .
A mica titanium pigment may be used as the white pigment of the present invention. The mica titanium pigment has a mica flaky crystal as a nucleus, titanium oxide hydrate is precipitated on the nucleus, and this is fired to obtain titanium dioxide.

As the amorphous silica of the present invention, natural amorphous silica such as diatomaceous earth and acid clay can be used, but synthetic amorphous silica is more preferably used. As synthetic amorphous silica, dry silica produced by a dry synthesis method, wet silica produced by a precipitation method which is a wet synthesis method,
Examples thereof include silica gel produced by a gel method and colloidal silica produced by a sol-gel method. Among these, dry silica and wet silica can be particularly preferably used.

Representative examples of the amorphous silica of the present invention include those having an average agglomerated particle size measured by a coal counter method of about 0.1 to 20 μm, preferably about 0.5 to 10 μm. Examples of the specific surface area (BET method) include, but are not limited to, about 5 to 500 m ² / g.

  Of the white pigment, mica and amorphous silica, white pigment and amorphous silica are preferable, and amorphous silica is preferably used.

Each component constituting the primer composition of the present invention is preferably mixed in the following ratio. Each component is expressed in mass% with respect to the whole primer.
(A) Hydrocarbon resin and / or modified hydrocarbon resin: 1 to 30%, preferably 2 to 30%, more preferably 3 to 25%,
(B) cold-setting thermosetting resin: 1-40%, preferred properly 2-30%
(C) Preservative: 0 to 10%, preferably 0 to 5%, more preferably 0 to 4%, and (D) at least one component selected from white pigment, mica and amorphous silica: 1 -50%, preferably 1-40%.

  In each component constituting the primer composition of the present invention, when the component (C) is amorphous silica, the component (C) is more preferably 1 to 10%.

  100 parts by mass of the composition obtained by mixing at the above composition ratio is usually made into a paint using a diluent of 2 to 50 times, preferably 2.5 to 20 times, more preferably 3 to 10 times. The undercoat of the present invention is prepared by preparing a primer composition using a diluent, and paints as an aqueous undercoat such as aqueous dispersion or aqueous emulsion, or as a solvent-based undercoat such as organic solvent dispersion or organic solvent emulsion type. Is preferable. Preparation and coating of the composition of the present invention are carried out by mixing each component in the diluent sequentially or simultaneously. At the time of mixing, additives such as a weather stabilizer (antioxidant, ultraviolet absorber), pigment, viscosity modifier, pigment, surfactant and the like may be contained.

  The diluent (E) is preferably water or a hydrocarbon solvent. Examples of the hydrocarbon solvent include an aromatic hydrocarbon solvent, an aliphatic hydrocarbon solvent, and an aromatic-aliphatic mixed solvent. For aromatic systems, toluene, xylene, and their nuclear hydrogenated oils are preferred. Paraffin oil and isoparaffin oil can be used in the aliphatic system, but those obtained by adding solubil, ethyl acetate, methyl acetate, methyl isobutyl ketone, butanol, etc. to these are preferably used. Is exemplified. As the aromatic-aliphatic mixed solvent, “Solvesso” and the like are preferable. Natural oils such as orange oil from orange peels and aqueous solvents can also be used. Furthermore, carbonate ester solvents such as ethylene carbonate can also be used.

The wood to which the primer of the present invention is applied is not limited in form, shape, size, length, or thickness, regardless of the tree species or the like. The wood protective agent of the impregnation type or the semi-film forming type can be applied to the wood primed with the primer of the present invention. By undercoating the primer of the present invention, it is possible to maintain the wood grain and natural texture after coating, in other words, live bark. When the wood protective agent is of an impregnation type, it is a preferable embodiment because it has a high effect of maintaining the grain and natural texture of wood after painting, in other words, obtaining live bark.
It is also possible to coat the wood treated with the impregnation type, semi-film-forming type or film-forming type wood protective agent, after applying the primer of the present invention, and then applying the impregnated type or semi-film-forming type wood protective agent. it can.
The undercoat of the present invention is effective in undercoating when re-coating an impregnated type of wood protective agent on wood for outdoor use treated with a wood protective agent. It is suitably applied to wood for outdoor use such as verandas and board walls, and wood for indoor water use such as bathrooms and bathrooms.

  The primer of the present invention is applied to wood or the like by coating. Application is carried out by a conventional method using a brush, a roller, a sprayer or the like, or by dipping. It is preferable to remove the dirt and dust from the coated surface in advance by high-pressure washing, brushing or the like, and remove the coating film of the wood protective agent as necessary to dry the wood. When the wood treated with the wood protective agent is treated with a film-forming type wood protective agent and the film-forming type wood protective agent remains on the wood, before applying the primer of the present invention, It is preferable to remove the wood protective agent coating.

The wood protective agent is applied to the wood to which the primer of the present invention is applied. The wood protective agent to be applied is an impregnation type or semi-film-forming type wood protective agent, and in particular, an impregnation type wood protective agent is used. preferable.
When applying the wood primer of the present invention to wood for outdoor use treated with an impregnated wood protective agent, and then re-coating the impregnated wood protective agent, especially after repainting the wood grain and natural This is a preferred embodiment because it has a high effect of maintaining the texture, in other words, obtaining live bark.

  As such an impregnation type wood protective agent, for example, a wood protective agent as described in JP 2002-137206 A can be used. Moreover, it can also select and use suitably from what is marketed as an impregnation type wood protective agent. As such a commercial product, “Non-lot (registered trademark) 205N” (manufactured by Mitsui Chemicals, Inc.) and the like can be mentioned. There is no restriction | limiting in particular as a coating method of an impregnation type wood protective agent, A conventionally well-known method is applied.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

Example 1
raw materials:
(A) Hydrocarbon resin: Aromatic petroleum resin “PETROZIN 120” (manufactured by Mitsui Chemicals, Inc.) [ring and ball method softening point 120 ° C.]
(B) Room temperature curable thermosetting resin: “Arachid 7500T” (containing 1% by mass of cobalt naphthenate catalyst) (Arakawa Chemical Co., Ltd.)
(C) Preservative: 3-iodo-2-propenylbutylcarbamate (IPBC, “Troysan”), p- (2-phenyl-isopropyl) phenol (D) White pigment: Titanium paste D (titanium white solid content about 60% Manufactured by Miki Riken Kogyo Co., Ltd.)
(E) Organic solvent: “Exol D40” (naphthenic solvent, manufactured by ExxonMobil Chemical)

[Adjustment of primer]
20% by mass of the above hydrocarbon resin, 10% of thermosetting resin at room temperature, 0.5% by mass of preservative, 30% by mass of white pigment paste as titanium white, and 100% by mass of “Exsol D40” as organic solvent A primer was prepared by adding the remaining amount.

[Application to wood]
After three years have passed since the impregnation type wood protective agent “Non-Lot” (registered trademark) was painted, the wooden outer wall of the wooden building was pressure-washed, dried and brushed, and then the primer obtained above was applied. did.
After the primer was dried, a yellow impregnation type wood protective agent “Non-lot 205N” was applied twice.
After coating the yellow impregnation type wood protective agent, the surface condition of the wood was visually observed. The observation results are shown in Table 1.

(Example 2)
raw materials:
(A) Hydrocarbon resin: Aromatic petroleum resin “PETROZIN 120” (manufactured by Mitsui Chemicals, Inc.) [ring and ball method softening point 120 ° C.]
(B) Room temperature curable thermosetting resin: “Arachid 7500T” (containing 1% by mass of cobalt naphthenate catalyst) (Arakawa Chemical Co., Ltd.)
(C) Preservative: 3-iodo-2-propenylbutylcarbamate (IPBC, “Troysan”), p- (2-phenyl-isopropyl) phenol (D) amorphous silica: synthetic amorphous silica (trade name: Tosoh Silica)
(E) Organic solvent: “Exol D40” (naphthenic solvent, manufactured by ExxonMobil Chemical)

[Adjustment of primer]
20% by mass of the above hydrocarbon resin, 10% of a room temperature curable thermosetting resin, 0.5% by mass of a preservative, 1.2% by mass of amorphous silica, and 100% by mass of “Exsol D40” as an organic solvent A primer was prepared by adding the remaining amount.

[Application to wood]
After three years have passed since the impregnation type wood protective agent “Non-Lot” (registered trademark) was painted, the wooden outer wall of the wooden building was pressure-washed, dried and brushed, and then the primer obtained above was applied. did.
After the primer was dried, a yellow impregnation type wood protective agent “Non-lot 205N” was applied twice.
After coating the yellow impregnation type wood protective agent, the surface condition of the wood was visually observed. The observation results are shown in Table 1.

(Comparative Example 1)
In the examples, the yellow impregnation type wood protective agent “Non-Lot 205N” was applied twice in the same manner except that the application of the primer was omitted, and the surface condition of the wood after painting was visually observed. The observation results are shown in Table 1.

In accordance with the present invention, after painting impregnated or semi-impregnated wood protective agent, and after repainting when re-coating impregnated or semi-impregnated type wood protective agent on wood treated with wood protective agent Also, a primer is provided that keeps the brightness of new wood and maintains the wood grain and natural texture of the wood.
According to the present invention, when re-coating impregnation type or semi-film formation type wood protective agent on wood treated with impregnation type, semi-film formation type or film formation type wood protective agent, An undercoating method that makes it possible to maintain a smooth texture is provided.
According to the present invention, particularly suitable for undercoating when re-applying an impregnation type or semi-film-forming type wood protective agent to wood for outdoor use treated with an impregnation type, semi-film-forming type or film-forming type wood protective agent. An undercoating method is provided.

Claims (5)

(A) 1 to 30% by mass of a hydrocarbon resin and / or a modified hydrocarbon resin obtained by modifying the resin with a polyvalent carboxylic anhydride, (B) 1 to 40 % by mass of a thermosetting resin at room temperature, (C) A wood primer comprising 0 to 10% by mass of a preservative, (D) at least one component selected from white pigment, mica and amorphous silica, and (E) a residual amount of diluent.   A method of applying the wood primer according to claim 1 to wood.   The method according to claim 2, wherein the wood is wood treated with a wood protective agent.   A method of further applying an impregnation type or semi-film-forming type wood protective agent to the wood to which the primer has been applied by the method according to claim 2 or 3.   A method of applying an impregnation type wood protective agent after applying the wood primer according to claim 1 to wood treated with an impregnation type wood protective agent.