JP2024036359A - Decoration method - Google Patents

Abstract

To provide a decoration method capable of forming an aesthetically pleasing, newly deposited coating film and holding its finished state over a long period on an existing wall surface having an uneven pattern and comprising an existing coating film of high durability.SOLUTION: The present invention is a decoration method for an aged existing wall surface, the existing wall surface having an uneven pattern on its surface and comprising at least one type of existing coating film selected from an inorganic coating film, an organic-inorganic composite coating film and a fluorine resin coating film. To the existing wall surface is applied an under coating containing a resin component and powder (m) of an average particle diameter equal to or less than 1 μm and/or powder (n) with an oil absorption amount equal to or higher than 100 ml/100 g and an average particle diameter of 2-100 μm, where a total amount of the powder (m) and the powder (n) is 10-250 pts.wt. relative to a solid content of the resin component 100 pts.wt., and a pigment volume concentration is 1-30%. After drying the coating, an upper coating is applied.SELECTED DRAWING: None

Description

The present invention relates to a cosmetic method applicable to buildings and the like.

Conventionally, concrete, mortar, various plate-shaped wall materials, etc. have been used for walls of buildings and the like. Among these, for example, as plate-shaped wall materials, those whose surfaces are provided with an uneven pattern to give a three-dimensional effect and are coated for protection and beauty are often used. Materials used for such coatings are preferably those that can form highly durable coatings, such as inorganic coatings, organic-inorganic composite coatings, and fluororesin coatings, from the viewpoint of extending life and reducing maintenance. .

Walls made of such plate-shaped wall materials are exposed to the outdoors for long periods of time, so the surface of the plate-shaped wall materials deteriorates due to the effects of sunlight, rainfall, temperature changes, dust, etc. The original aesthetic appearance of plate wall materials deteriorates over time. Even on walls equipped with highly durable coatings, it is difficult to avoid deterioration and loss of aesthetic appearance over time.

JP 2016-117795 A describes applying an undercoat paint containing an epoxy resin, an amine compound, a silane coupling agent, etc. to a film of acrylic silicone resin or the like. The patent publication discloses that such an undercoat paint exhibits good adhesion to highly durable coatings such as acrylic silicone resins.

Japanese Patent Application Publication No. 2016-117795

However, even if the method described in the above-mentioned patent document is used to apply makeup to a deteriorated surface such as a plate-like wall material with an uneven pattern, there is a risk of blistering, peeling, etc. occurring over time, and the results are not satisfactory in practice. is difficult to obtain.

The present invention was developed in view of the above-mentioned problems, and it is possible to form a beautiful new coating on an existing wall surface with an uneven pattern and a highly durable existing coating, and to maintain the finished state for a long time. The object is to provide a makeup method that can be maintained.

As a result of intensive studies to achieve the above object, the present inventor came up with a method of sequentially applying a specific base coat material and top coat material to the existing wall surface as described above, and completed the present invention. It has arrived.

That is, the present invention has the following features.
1. A method of decorating existing walls that have deteriorated over time,
The existing wall surface has an uneven pattern on its surface,
It is equipped with at least one existing coating selected from an inorganic coating, an organic-inorganic composite coating, and a fluororesin coating,
For the existing wall above,
A resin component, and a powder (m) with an average particle diameter of 1 μm or less and/or a powder (n) with an oil absorption of 100 ml/100 g or more and an average particle diameter of 2 to 100 μm ,
The powder (n) is one or two selected from zeolite, sodium sulfate, alumina, allophane, diatomaceous earth, hydrated silicon dioxide, vermiculite, perlite, Oya stone powder, activated clay, charcoal, activated carbon, wood powder, and shirasu balloon. That's all,
The total amount of the powder (m) and the powder (n) is 10 to 250 parts by weight based on 100 parts by weight of the solid content of the resin component , and the pigment volume concentration is 1 to 30% . A cosmetic method characterized by applying a topcoat material after the film has dried.
The above oil absorption amount is a value measured by the method of JIS K5101-13-1:2004 "Refined linseed oil method".
2. The above-mentioned existing wall surface has an uneven pattern on the surface and is composed of a plurality of plate-shaped wall materials provided with an existing coating.1. Makeup method described.

According to the present invention, a beautiful new coating can be formed on an existing wall surface having an uneven pattern and an existing coating, and the finished state can be maintained for a long period of time.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated.

The present invention can be applied to existing walls of buildings, civil engineering structures, etc. Such an existing wall surface is composed of at least a base material and an existing coating. Examples of the base material include concrete, mortar, metal, wood, glass, and various plate-shaped wall materials. Among these, examples of plate-like wall materials include hardened inorganic materials containing cement, calcium silicate, lime, gypsum, or the like as a main component. Specific examples of such plate-shaped wall materials include cement boards, extruded boards, slate boards, PC boards, ALC boards, fiber-reinforced cement boards, siding boards, ceramic boards, calcium silicate boards, gypsum boards, and rigid boards. Examples include wood chips and cement boards.

The present invention targets an existing wall surface that has an uneven pattern on its surface. There are various types of uneven patterns on existing walls, such as tile-like patterns, brick-like patterns, geometric patterns, striped patterns, lattice patterns, polka dot patterns, sand wall patterns, yuzu skin patterns, ripple patterns, etc. , graphic patterns with designs of animals and plants, and the like. Specifically, the shape of the convex portion when the concave-convex pattern is viewed from the front includes, for example, a square, a rectangle, a circle, an ellipse, a triangle, a rhombus, a polygon, an irregular shape, and the like. Further, the cross-sectional shape of the convex portions in the uneven pattern includes, for example, trapezoid, square, rectangle, semicircle, wave, step, triangle, chevron, and the like. Examples of the recesses in the uneven pattern include those that are flat and form joints. The height difference between the concave portion and the convex portion may be constant or different in each region, but is preferably 20 mm or less, and more preferably about 1 to 15 mm. Such an uneven pattern may be provided on either or both of the base material and the existing coating.

In the existing wall surface in the present invention, at least one type of existing coating (hereinafter also referred to as "highly durable existing coating") selected from an inorganic coating, an organic-inorganic composite coating, and a fluororesin coating is provided on the surface of the base material. These existing coatings are various highly durable coatings that have already been coated on the base material by on-site coating, factory coating (line coating), or the like. Examples of such existing coatings include colored coatings (enamel coatings, printed coatings, etc.), clear coatings, and laminated coatings of these. be. Such a coating material may be, for example, a room temperature drying type, a room temperature curing type, a baking curing type, an ultraviolet (UV) curing type, an electron beam curing type, or the like.

Examples of binders for such coating materials include inorganic binders such as silicone resins, alkoxysilanes, colloidal silica, and silicates, organic-inorganic composite binders such as acrylic silicone resins, and fluororesins. .

In particular, the present invention provides that the existing coating on the outermost surface is an inorganic coating (a coating containing the above-mentioned inorganic binder), an organic-inorganic composite coating (a coating containing the above-mentioned organic-inorganic composite binder), or a fluororesin coating (a coating containing the above-mentioned fluororesin). It is preferable to use one or more types selected from the following, and furthermore, it can be suitably applied to these clear coatings. Such existing coatings may include photocatalytic titanium oxide or the like.

The present invention can be applied as a renovation method when an existing wall surface as described above has deteriorated over time. Although the degree of deterioration over time is not particularly limited, wall surfaces that have been used for approximately 5 years or more (even 8 years or more) can be subject to the present invention.

The existing wall surface of the present invention is preferably constructed by installing a plurality of plate-shaped wall materials that have an uneven pattern on the surface and are provided with a highly durable existing coating. The present invention can provide advantageous effects when applied to an existing wall surface composed of such a plurality of plate-shaped wall materials. It is desirable that the uneven pattern be applied at least to the plate-like wall material itself. A sealing material or a dry joint material may be filled in the joints between the plate-shaped wall materials.

The cosmetic method of the present invention is to sequentially apply (paint) a base coat material and a top coat material to an existing wall surface that has deteriorated over time as described above.

In the present invention, the undercoat material contains a resin component and a powder (m) with an average particle diameter of 1 μm or less and/or a powder (n) with an oil absorption of 100 ml/100 g or more in a specific ratio. In the present invention, by using such an undercoat material, the finished state of the newly installed coating formed on the above-mentioned existing wall surface can be maintained for a long period of time.

As the resin component in the undercoat material, for example, water-based resins such as water-soluble resins and water-dispersible resins, non-aqueous resins such as solvent-soluble resins and non-water-dispersible resins, or solvent-free resins can be used.

Among these, when a water-based resin is used as the resin component, a water-based undercoat material can be obtained. A water-based primer material contains water as a medium, and may further contain a water-soluble solvent such as a lower alcohol, a polyhydric alcohol, an ether compound, an ester compound, or an alkylene oxide-containing compound as necessary. good.

When a non-aqueous resin is used as the resin component, a non-aqueous undercoating material can be obtained. A non-aqueous base coating material contains a non-aqueous solvent as a medium. Examples of non-aqueous solvents include aliphatic hydrocarbon solvents such as n-heptane, n-hexane, n-pentane, n-octane, n-nonane, n-decane, n-undecane, and n-dodecane, and methylcyclohexane. , alicyclic hydrocarbon solvents such as ethylcyclohexane, mixed solvents containing aliphatic hydrocarbons such as mineral spirits, petroleum solvents such as petroleum ether, petroleum naphtha, solvent naphtha, kerosene, isoparaffin solvents, alcohol solvents, etc. , ether alcohol solvents, ether solvents, ester solvents, ether ester solvents, ketone solvents, and the like. These can be used alone or in combination of two or more.

The non-aqueous undercoating material preferably contains a non-aqueous solvent with an aniline point of 12 to 70°C. It is thought that such a non-aqueous solvent contributes to improving adhesion by slightly swelling or dissolving the existing coating. Examples of the non-aqueous solvent with an aniline point of 12 to 70°C include one or more selected from aliphatic hydrocarbon-containing mixed solvents such as mineral spirits, petroleum ether, petroleum naphtha, solvent naphtha, kerosene, etc. suitable. Note that the aniline point is a value measured by the method of JIS K2256.

The resin component in the undercoat material is composed of one or more compounds, and it is desirable that at least one of the compounds is a compound having a reactive silyl group. By containing a compound having a reactive silyl group as a constituent component of the resin component in the undercoating material, adhesion to existing coatings such as inorganic coatings, organic-inorganic composite coatings, and fluororesin coatings can be further improved. This is preferable in terms of improving the effects of the invention. Although the mechanism of action is not limited to the following, it is thought that the crosslinking reactivity of the reactive silyl group, the affinity for existing coatings, etc. contribute.

The reactive silyl group is one in which one or more functional groups selected from, for example, an alkoxyl group, a hydroxyl group, a phenoxy group, a mercapto group, an amino group, a halogen, etc. are bonded to a silicon atom. Among these, an alkoxysilyl group in which an alkoxyl group is bonded to a silicon atom and/or a silanol group in which a hydroxyl group is bonded to a silicon atom are preferred.

Examples of compounds having reactive silyl groups include tetraalkoxysilane compounds, alkylalkoxysilane compounds, silane coupling agents, vinyl compounds containing reactive silyl groups, and compounds derived from these (e.g., condensates, modified polymers, polymers, copolymers, etc.). These can be used alone or in combination of two or more.

Among these, examples of the tetraalkoxysilane compound include tetramethoxysilane, tetraethoxysilane, and tetrabutoxysilane.

Examples of the alkyl alkoxysilane compounds include methyltrimethoxysilane, methyltriethoxysilane, methyltributoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, ethyltributoxysilane, propyltrimethoxysilane, propyltriethoxysilane, butyl Trimethoxysilane, butyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, phenyltributoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, dimethyldibutoxysilane, diethyldimethoxysilane, diethyldiethoxysilane, dipropyldimethoxy Examples include silane, dipropyldiethoxysilane, dibutyldimethoxysilane, dibutyldiethoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane, diphenyldibutoxysilane, methylphenyldimethoxysilane, and methylphenyldiethoxysilane.

Examples of the silane coupling agent include epoxy group-containing silanes such as γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropylmethyltriethoxysilane, and β-(3,4 epoxycyclohexyl)ethyltrimethoxysilane. Coupling agents, amino group-containing silane coupling agents such as N-β (aminoethyl) γ-aminopropylmethyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, and isocyanate group-containing Examples include silane coupling agents, isocyanurate group-containing silane coupling agents, acid anhydride group (carboxyl group)-containing silane coupling agents, and the like.

Examples of the reactive silyl group-containing vinyl compound include γ-(meth)acryloxypropyltrimethoxysilane, γ-(meth)acryloxypropyltriethoxysilane, γ-(meth)acryloxypropylmethyldimethoxysilane, γ- Examples include (meth)acryloxypropylmethyldiethoxysilane. Such a reactive silyl group-containing vinyl compound can be used in the form of a resin (eg, acrylic silicone resin, etc.) obtained by copolymerization with other monomers. Examples of such monomers include (meth)acrylic acid alkyl esters, hydroxyl group-containing monomers, carboxyl group-containing monomers, amino group-containing monomers, pyridine monomers, nitrile group-containing monomers, amide group-containing monomers, epoxy group-containing monomers, Examples include carbonyl group-containing monomers, fluorine-containing monomers, aromatic monomers, ultraviolet absorbing group-containing monomers, and photostable group-containing monomers. These can be used alone or in combination of two or more. In the present invention, acrylic acid alkyl ester and methacrylic acid alkyl ester are collectively referred to as (meth)acrylic acid alkyl ester. Monomer is a general term for compounds having a polymerizable unsaturated double bond.

The resin component in the undercoat material can contain compounds other than the compound having a reactive silyl group. Examples of such compounds include various resins such as acrylic resins, polyester resins, polyether resins, polyurethane resins, fluororesins, vinyl acetate resins, epoxy resins, and vinyl chloride resins, or those that can produce these resins. Various compounds can be mentioned.

Examples (1) to (4) of the resin component of the undercoat material are shown below.

(1) When using a resin obtained by copolymerizing at least a reactive silyl group-containing vinyl compound and a hydroxyl group-containing monomer as the resin containing a reactive silyl group-containing vinyl compound in the resin component, such a resin can be used in combination with, for example, a polyisocyanate compound (described later).

(2) When using, for example, a resin obtained by copolymerizing at least a reactive silyl group-containing vinyl compound and an epoxy group-containing monomer as the resin containing a reactive silyl group-containing vinyl compound in its constituent components, such a resin may be used. The resin can be used in combination with, for example, a polyamine compound (described later).

(3) Embodiment (3) includes a polyol compound, a polyisocyanate compound, and a compound having a reactive silyl group as the resin component in the undercoat material.

Examples of the polyol compound in this embodiment (3) include polyether polyols, polyester polyols, acrylic polyols, polyisoprene polyols, carbonate polyols, etc., and one or more of these can be used. The hydroxyl value of the polyol compound is preferably 10 to 200 KOHmg/g, more preferably 20 to 100 KOHmg/g. The hydroxyl value is a value expressed by the number of mg of potassium hydroxide equivalent to the hydroxyl group contained in 1 g of resin solid content.

In aspect (3), it is desirable to include an acrylic polyol (hydroxyl group-containing acrylic resin) as the polyol compound. As the acrylic polyol, one that contains a (meth)acrylic acid alkyl ester, a hydroxyl group-containing monomer, and other monomers as necessary as resin constituents, and polymerizes these can be used. As the (meth)acrylic acid alkyl ester and the hydroxyl group-containing monomer, the same ones as mentioned above can be used. Examples of the other monomers mentioned above include carboxyl group-containing monomers, amino group-containing monomers, pyridine monomers, nitrile group-containing monomers, amide group-containing monomers, epoxy group-containing monomers, carbonyl group-containing monomers, alkoxysilyl group-containing monomers, aromatic group monomers, ultraviolet absorbing group-containing monomers, photostable group-containing monomers, and the like. These can be used alone or in combination of two or more.

The polyisocyanate compound has two or more isocyanate groups in one molecule, and crosslinks with the polyol compound to form a polyurethane resin coating. Examples of the polyisocyanate compound include toluene diisocyanate (TDI), 4,4-diphenylmethane diisocyanate (pure-MDI), polymeric MDI, xylylene diisocyanate (XDI), hexamethylene diisocyanate (HMDI), isophorone diisocyanate (IPDI), and water. Examples include doped XDI, hydrogenated MDI, etc., or derivatives thereof (for example, compounds obtained by urethanation reaction, allophanate reaction, isocyanurate reaction, etc.), and those having allophanate groups, allophanate groups and isocyanurate groups. You can also use what you have. These can be used alone or in combination of two or more.

The mixing ratio of the polyisocyanate compound may be set in consideration of the equivalent ratio of the isocyanate groups of the polyisocyanate compound to the hydroxyl groups of the hydroxyl group-containing resin, that is, the NCO/OH ratio. The NCO/OH ratio is preferably between 0.6 and 1.4, more preferably between 0.8 and 1.2. With such a ratio, the effects of the present invention can be sufficiently obtained.

As the compound having a reactive silyl group in aspect (3), the same compounds as those mentioned above can be used.

(4) Embodiment (4) includes an epoxy resin, a polyamine compound, and a compound having a reactive silyl group as the resin component in the undercoat material.

In this embodiment (4), an epoxy resin can be used. Examples of such epoxy resins include flexible epoxy resins and hard epoxy resins. An embodiment in which the epoxy resin contains at least a flexible epoxy resin is preferable from the viewpoint of improving the effects of the present invention, and a case where the existing wall surface is one in which a sealing material is filled in the joint between plate-shaped wall materials. Advantageous effects can also be obtained.

Examples of flexible epoxy resins include aliphatic-modified epoxy resins, butadiene-based epoxy resins, ε-caprolactone-modified epoxy resins, thiol-based epoxy resins, amine-modified epoxy resins, rubber-modified epoxy resins, urethane-modified epoxy resins, and polyol-modified epoxy resins. Examples include epoxy resins and fatty acid-modified epoxy resins. These can be used alone or in combination of two or more. Among these, fatty acid-modified epoxy resins are preferred.

The proportion of the flexible epoxy resin in the epoxy resin of aspect (4) (in terms of solid content) is preferably 50% by weight or more, more preferably 70 to 100% by weight, from the viewpoint of adhesion to the base, trackability, etc. Weight%.

Fatty acid-modified epoxy resin is obtained by addition-reacting an aliphatic polybasic acid compound to an epoxy resin. For example, an esterification reaction can be used for the addition reaction. As the epoxy resin used here, for example, various epoxy resins such as bisphenol A type epoxy resin, bisphenol F type epoxy resin, and other hard epoxy resins described below can be used. Examples of aliphatic polybasic acid compounds include maleic acid, maleic anhydride, fumaric acid, itaconic acid, itaconic anhydride, citraconic acid, tetrahydrophthalic acid, tetrahydrophthalic anhydride, hexahydrophthalic acid, hexahydrophthalic anhydride, Examples include cyclohexanedicarboxylic acid, succinic acid, malonic acid, glutaric acid, adipic acid, azelaic acid, sebacic acid, 1,12-docanedioic acid, and dimer acid. Among these, dimer acid is preferred.

Dimer acids are dimers of unsaturated fatty acids. Examples of the unsaturated fatty acids constituting the dimer acid include oleic acid, elaidic acid, cetoleic acid, sorbic acid, linoleic acid, linoleic acid, arachidonic acid, soybean oil fatty acid, tall oil fatty acid, and linseed oil fatty acid.

A dimer acid-modified epoxy resin obtained by addition-reacting a dimer acid to an epoxy resin is suitable as an epoxy resin for an undercoat material. The proportion of the dimer acid-modified epoxy resin in the epoxy resin of the undercoating material (in terms of solid content) is preferably 50% by weight or more, more preferably 70 to 100% by weight from the viewpoint of adhesion to the base, followability, etc. It is.

Examples of hard epoxy resins include bisphenol type epoxy resins such as bisphenol A type epoxy resin and bisphenol F type epoxy resin, phenol novolac type epoxy resins such as phenol novolac type bisphenol A epoxy resin and phenol novolac type bisphenol F epoxy resin, and cresol. Novolac type epoxy resin, novolac type epoxy resin such as bisphenol A novolac type epoxy resin, alicyclic epoxy resin, hydrogenated bisphenol A type epoxy resin, glucidyl ether type epoxy resin, bisphenol S type epoxy resin, biphenyl type epoxy resin, Examples include dicyclo-type epoxy resins and naphthalene-type epoxy resins. These can be used alone or in combination of two or more.

The epoxy resin of aspect (4) preferably has an epoxy equivalent (per solid content) of 300 to 3000 g/eq, more preferably 400 to 2000 g/eq, even more preferably 450 to 1500 g/eq, particularly preferably 500 to 1100 g /eq. When the epoxy equivalent is at least the above lower limit, it is suitable in terms of followability and adhesion to the base. When the epoxy equivalent is below the above upper limit, it is suitable in terms of blistering resistance, adhesion, suitability for top coating materials, etc. Note that the epoxy equivalent is the value obtained by dividing the molecular weight of the epoxy resin by the number of epoxy groups.

The polyamine compound in aspect (4) has two or more amino groups in one molecule, and forms an epoxy resin coating by crosslinking with the epoxy resin. Examples of polyamine compounds include aliphatic polyamines, alicyclic polyamines, aromatic polyamines, heterocyclic polyamines, aliphatic polyamides, alicyclic polyamides, aromatic polyamides, aliphatic polyamide amines, alicyclic polyamide amines, and aromatic polyamides. Examples include polyamine compounds such as polyamide amine. These can be used alone or in combination of two or more. Among these, one or more polyamine compounds selected from aliphatic polyamines, aliphatic polyamides, and aliphatic polyamide amines can be preferably used.

The active hydrogen equivalent (per solid content) of such a polyamine compound is preferably 40 to 200 g/eq, more preferably 50 to 150 g/eq, and still more preferably 60 to 95 g/eq. When the active hydrogen equivalent is within the above range, sufficient effects can be obtained in terms of adhesion and the like. Note that the active hydrogen equivalent is a value obtained by dividing the molecular weight of the polyamine compound by the number of hydrogen atoms in the amino group.

In aspect (4), regarding the epoxy resin and the polyamine compound, the active hydrogen equivalent of the polyamine compound and the epoxy equivalent of the epoxy resin are [active hydrogen equivalent of the polyamine compound/epoxy equivalent of the epoxy resin], preferably less than 0.4, Each material can be set and used in a combination of more preferably 0.01 to 0.3, still more preferably 0.03 to 0.25, particularly preferably 0.05 to 0.2. By using a combination of materials satisfying such conditions as the epoxy resin and polyamine compound, more favorable effects in terms of adhesion and the like can be obtained.

The blending ratio of the epoxy resin and the polyamine compound is set so that [(blending amount of polyamine compound/active hydrogen equivalent of polyamine compound)/(blending amount of epoxy resin/epoxy equivalent of epoxy resin)] is 1.0 or less. It is preferably 0.2 to 1.0, still more preferably 0.4 to 0.98, particularly preferably 0.6 to 0.95, and most preferably 0.7 to 0.9. . Note that the blending amount and active hydrogen equivalent of the amine curing agent, and the blending amount and epoxy equivalent of the epoxy resin are all based on the solid content. When the blending ratio of the epoxy resin and polyamine compound is below the above upper limit, it is suitable in terms of adhesion, substrate followability, and suitability for topcoat materials, and when it is above the above lower limit, it is suitable for curability, adhesion, etc. This is preferable in this respect.

As the compound having a reactive silyl group in aspect (4), the same compounds as those mentioned above can be used. In aspect (4), a silane coupling agent is suitable, and in particular, one or more types selected from epoxy group-containing silane coupling agents and amino group-containing silane coupling agents can be preferably used.

In aspect (4), the solid content weight ratio of the polyamine compound and the silane coupling agent (polyamine compound:silane coupling agent) is preferably from 10:90 to 90:10, more preferably from 12:88 to The ratio is 80:20, more preferably 14:86 to 65:35, particularly preferably 15:85 to 50:50. Adhesion can be further improved by using both components in such a ratio. It is particularly suitable for water-based undercoating materials.

The undercoat material in the present invention preferably contains 0.1 to 30% by weight, more preferably 0.2 to 25% by weight, and even more preferably 0.3 to 20% by weight in terms of SiO ₂ in the solid content of the resin component. A compound having a reactive silyl group can be included within the range. By setting the mixing ratio of the compound having a reactive silyl group within such a range, it is possible to further improve the adhesion between the existing film and the undercoat film, and the adhesion between the undercoat film and the topcoat film. It is also suitable for preventing cracking of the undercoat film and the top coat film.

Note that the SiO ₂ equivalent is expressed by the weight remaining as silica (SiO ₂ ) when a compound having an Si—O bond is completely hydrolyzed and then fired at 900° C. In general, tetraalkoxysilanes, alkylalkoxysilanes, and the like have the property of reacting with water to undergo a hydrolysis reaction to form silanol, and further to cause a condensation reaction between silanols or between silanol and alkoxy. When this reaction is carried out to its ultimate extent, it becomes silica (SiO ₂ ). These reactions are
RO(Si(OR) ₂ O) _n R+(n+1)H ₂ O→nSiO ₂ +(2n+2)ROH
(R represents an alkyl group. n is an integer.)
It is expressed by the reaction formula. The SiO ₂ conversion in the present invention is calculated by converting the amount of the remaining silica component based on this reaction formula.

In the base coating material, powder (m) with an average particle diameter of 1 μm or less (hereinafter also referred to as "(m) component") and/or powder (n) with an oil absorption of 100 ml/100 g or more (hereinafter referred to as "(n) component") is used. ). In the present invention, by using such an undercoat material, the finished state of the newly installed coating formed on the above-mentioned existing wall surface can be maintained for a long period of time. The reason for this effect is, but is not limited to, the following: The action of the specific powder in the undercoat material gives the undercoat material viscosity, and the undercoat material evenly follows the unevenness of the existing wall surface. In addition to being easier to apply, the strength of the base coat film increases due to the cohesive force of the specific powder, improving adhesion to existing high-durability films, and improving resistance to various deterioration factors. It is presumed that these factors are contributing factors.

The average particle diameter of component (m) is 1 μm or less, preferably 0.1 to 0.9 μm, more preferably 0.2 to 0.8 μm. It is thought that component (m) having such an average particle diameter contributes to imparting viscosity to the undercoat material due to the large specific surface area of the powder. By having the average particle size of component (m) equal to or larger than the above lower limit, the viscosity of the undercoat material can be appropriately controlled, workability during the application of the undercoat material is sufficiently ensured, and the undercoat material can be applied to uneven surfaces of existing walls. It becomes easier to apply evenly along the lines. Note that the average particle diameter is an average value measured using a laser diffraction particle size distribution measuring device (measurement conditions are distribution standard: volume, refractive index: 1.60-0.10i).

As component (m), the material is not particularly limited and various powders can be used as long as the above-mentioned physical properties are satisfied. Examples of component (m) include titanium oxide, zinc oxide, aluminum oxide, magnesium oxide, calcium carbonate, glass powder, hollow resin particles, and various colored pigments. These can be used alone or in combination of two or more. The oil absorption amount of component (m) is preferably 500 ml/100 g or less, more preferably 5 to 200 ml/100 g, and still more preferably 8 to 80 ml/100 g. Note that the oil absorption is a value measured by the method of JIS K5101-13-1:2004 "Refined linseed oil method."

The oil absorption amount of component (n) is 100 ml/100 g or more, preferably 150 ml/100 g or more, more preferably 200 ml/100 g or more. The upper limit of the oil absorption amount of component (n) is preferably 500 ml/100 g or less, more preferably 450 ml/100 g or less. It is thought that the component (n) having such an oil absorption amount contributes to imparting viscosity to the undercoat material by absorbing the medium, resin components, etc. in the undercoat material. By having the oil absorption amount of component (n) below the above upper limit, the viscosity of the undercoat material can be controlled appropriately, workability during the application of the undercoat material is sufficiently ensured, and the undercoat material does not fit the unevenness of the existing wall surface. It becomes easier to apply evenly along the line.

As component (n), the material is not particularly limited and various powders can be used as long as the above-mentioned physical properties are satisfied. Examples of the component (n) include zeolite, sodium sulfate, alumina, allophane, diatomaceous earth, hydrated silicon dioxide, vermiculite, perlite, Oya stone powder, activated clay, charcoal, activated carbon, wood powder, and shirasu balloon. These can be used alone or in combination of two or more. The average particle diameter of component (n) is preferably 0.5 μm or more, more preferably 1 to 100 μm, and even more preferably 2 to 80 μm.

The total amount of components (m) and (n) to be mixed is 10 to 250 parts by weight, preferably 25 to 220 parts by weight, more preferably 35 to 200 parts by weight, based on 100 parts by weight of the solid content of the resin component. Parts by weight. By mixing the amounts of component (m) and component (n) in such a ratio, the effects of the powder described above can be fully exerted, and the finished state of the newly installed coating can be maintained for a long period of time. can. If the mixing amount of component (m) and component (n) is less than the above lower limit, the effects of imparting viscosity and improving strength in the undercoat material will be insufficient, making it difficult to apply the undercoat material evenly. , adhesion may become insufficient, making it difficult to obtain the effects of the present invention. If the mixing amount of component (m) and component (n) exceeds the above upper limit, it will be difficult to obtain a viscosity suitable for evenly applying the undercoat material, and the ratio of the resin component will be relatively low. , adhesion may be insufficient.

In the undercoat material, powders (o) other than the components (m) and (n) (for example, coloring pigments, extender pigments, etc. that do not satisfy the above physical property values) may not be used unless the effects of the present invention are significantly impaired. One type or two or more types can also be used.

The total amount of component (m), component (n), and other powder (o) in the undercoat material, that is, the total amount of all powders, is preferably 10 to 250 parts by weight based on 100 parts by weight of the solid content of the resin component. Parts by weight, more preferably 25 to 220 parts by weight, even more preferably 35 to 200 parts by weight. Further, the total amount of component (m) and component (n) in the total amount of all powders is preferably 35% by weight or more, more preferably 45% by weight or more, still more preferably 55% by weight or more, particularly preferably 65% by weight or more. ~100% by weight. As described above, an undercoat material in which the total amount of all powders is within the above range and contains a high proportion of components (m) and (n) in all powders cannot fully obtain the effects of the present invention. In particular, it is preferable in that it is possible to form a beautiful new coating while making use of the uneven pattern of the existing wall surface, and to maintain its finished state for a long period of time.

When the undercoat material contains pigments such as component (m), component (n), and component (o), the pigment volume concentration of the undercoat material is preferably 1 to 30%, more preferably 3 to 25%, More preferably 5 to 23%, particularly preferably 8 to 20%. When the pigment volume concentration is within the above range, it is possible to enhance the effect of forming an undercoat film with excellent adhesion while taking advantage of the shape of the base. Incidentally, the pigment volume concentration is the volume percentage of the pigment contained in the dry coating film, and is a value calculated from the weight parts and specific gravity of the resin component and pigment that constitute the undercoat material. Note that the specific gravity of the resin component is 1.

The basecoat can include a thickener. Examples of thickeners include organic bentonite, finely divided silica, surface-treated calcium carbonate, amide wax, hydrogenated castor oil wax, benzylidene sorbitol, metal soap, oxidized polyethylene, polymerized vegetable oil, polycarboxylic acid amine salt, xanthan gum, guar gum, Examples include polyacrylic acid compounds, polyvinyl alcohol, polyethylene oxide, urethane-modified polyether compounds, and the like. These can be used alone or in combination of two or more.

The mixing amount (solid content) of the thickener is preferably 0.1 to 10 parts by weight, more preferably 0.2 to 5 parts by weight, based on 100 parts by weight of the solid content of the resin component. If the mixing amount of the thickener is within this range, combined with the effects of the components (m) and (n) mentioned above, the undercoat material will be easy to apply evenly along the unevenness of the existing wall surface. Therefore, sufficient adhesion can be ensured, and the effects of the present invention can be stably obtained.

The nonvolatile content of the undercoating material (at the time of coating) is preferably 30 to 90% by weight, preferably 40 to 80% by weight, and more preferably 45 to 75% by weight. When the non-volatile content of the undercoat material has such a ratio, it is possible to enhance the effect of evenly applying the undercoat material along the unevenness of the existing wall surface. Note that the nonvolatile content is a value measured by the method of JIS K5601-1-2, the heating temperature is 105° C., and the heating time is 60 minutes.

The undercoating material may contain various components other than the above-mentioned components as long as the effects of the present invention are not significantly impaired. Such components include, for example, aggregates, dyes, dehydrating agents, leveling agents, wetting agents, plasticizers, film forming aids, antifreeze agents, preservatives, antifungal agents, algaecides, antibacterial agents, and dispersants. agents, antifoaming agents, adsorbents, fibers, crosslinking agents, ultraviolet absorbers, light stabilizers, antioxidants, curing catalysts, and the like. Among these, examples of curing catalysts include organic tin compounds, organic aluminum compounds, organic titanate compounds, acidic compounds, amine compounds, and alkaline compounds. The undercoating material of the present invention can be manufactured by uniformly mixing the above-mentioned various components by a conventional method. The form of the undercoat material can be, for example, a one-component type, a two-component type, or a multi-component type.

In the present invention, an undercoat material that forms a film having a different color tone and/or glossiness from the existing wall surface can be used as the undercoat material. In the present invention, by using such an undercoat material, the existing wall surface is coated over the entire uneven pattern of the existing wall surface, including the concave and convex portions of the concave and convex pattern, as well as the boundaries between the concave and convex portions. It can be fully confirmed that the undercoat film is evenly formed along the unevenness, and the effects of the present invention can be obtained even more stably.

An undercoat material that forms a film with a different color tone from the existing wall surface is one that can be visually recognized as having a different color tone from the color tone of the existing wall surface. That's fine. Such an undercoat material preferably has a color difference (ΔE) between the existing wall surface and the undercoat film of 3 or more, more preferably 5 or more, and still more preferably 10 or more. In addition, for existing walls that have multiple areas with different tones (for example, a spotted pattern, a grid pattern, etc.), the color tone of the undercoat film will be different from the color tone of the area that occupies the largest area among those areas. It is fine as long as it is unique.

The color difference (ΔE) is a value measured using a color difference meter. Specifically, it can be calculated using the following formula from the L ^* value, a ^* value, and b ^* value (average value of 10 measurement points) of the existing wall surface and the undercoat material coating, respectively. Note that the L ^* value, a ^* value, and b ^* value of the undercoat film may be measured for the undercoat film formed on the existing wall surface.
<Formula> △E={(L ^* ₂ - L ^* ₁ ) ² + (a ^* ₂ - a ^* ₁ ) ² + (b ^* ₂ - b ^* ₁ ) ² } ^0.5
(In the formula, L ^* ₁ , a ^* ₁ , b ^* ₁ are the L ^* , a ^* , b ^* of the existing wall surface, respectively. L ^* ₂ , a ^* ₂ , b ^* ₂ are the L ^* , a of the primer coating, respectively. ^* ,b ^* )

The undercoat material that forms a film with a different glossiness from that of the existing wall surface may be any material as long as it can be visually recognized that the glossiness of the film (undercoat material film) is different from the glossiness of the existing wall surface. Such an undercoat material preferably has a difference in gloss between the existing wall surface and the undercoat film of 5 or more, more preferably 10 or more, and still more preferably 15 or more. In addition, for an existing wall surface in which a plurality of areas with different glossiness coexist, it is sufficient that the glossiness of the undercoat film is different from the glossiness of the area occupying the largest area among the areas.

Glossiness is a value measured using a glossmeter. Specifically, it can be determined from the 60 degree specular gloss (average value of 10 measurement points) of the existing wall surface and the undercoat material coating. Note that the glossiness of the undercoat film may be measured for the undercoat film formed on the existing wall surface.

The color tone and glossiness of the undercoat film can be set, for example, by adjusting the type and ratio of resin components, the type and ratio of powder, and the like. The glossiness can also be adjusted, for example, by combining two or more resins.

The base coat material can be applied directly to the existing wall surface, but various pre-treatments can also be applied if necessary. Pretreatment includes, for example, removing existing coatings that have significantly deteriorated, removing contaminants by high-pressure water washing, repairing with putty, filler, etc., restoring surface shape, and the like. When applying a new sealant to an existing wall, it is desirable to apply a primer approximately 2 to 10 days after applying the sealant.

In applying the undercoat material, known painting equipment can be used. As the painting tool, for example, a spray, a roller, a brush, a trowel, etc. can be used.
The amount of undercoat material to be applied may be set as appropriate depending on the surface shape of the existing wall surface, the painting equipment used, etc., but is preferably 0.03 to 0.5 kg/m ² , more preferably 0.05 to 0.0 kg/m 2 . .3 kg/ ^m2 . During painting, the base coat material can be diluted as appropriate.

The viscosity of the undercoat material during coating is preferably 0.1 to 10 Pa·s, more preferably 0.2 to 5 Pa·s. When the viscosity of the undercoating material is within such a range, the effects of the present invention can be stably obtained. The viscosity mentioned here is a value obtained by measuring the viscosity at 20 rpm (pointer value at the 4th rotation) using a BH type viscometer, and the measurement temperature is 23°C.

The drying time of the undercoating material is preferably 1 hour or more, more preferably about 2 to 200 hours at room temperature (0 to 40°C).

In the present invention, a top coat material is applied after the above-mentioned undercoat material is applied and dried. As the top coat material in the present invention, a material that can take advantage of the uneven pattern of the existing wall surface is suitable. Specific examples of the topcoat material that can be used include transparent topcoat materials, colored topcoat materials, and the like. The transparent top coat material contains a resin component, and the film thereof exhibits transparency. The transparent topcoat material may be one that forms a colored transparent film, and such a transparent topcoat material may contain, in addition to the resin component, a coloring pigment, etc. within a range that does not impair transparency. . Examples of the colored top coating material include those containing a resin component and a colored pigment.

Various resins can be used as the resin component in the top coat material. Examples of the resin include vinyl acetate resin, polyester resin, alkyd resin, vinyl chloride resin, epoxy resin, acrylic resin, urethane resin, acrylic silicone resin, fluororesin, and composite resins thereof. Among these, one or more selected from acrylic resins, urethane resins, acrylic silicone resins, fluororesins, etc. are preferred. In addition, the forms of such resin components include water-soluble resins, water-dispersible resins (resin emulsions), solvent-soluble resins, solvent-free resins, non-water-dispersible resins, powdered resins, etc. Among these, one or more selected from water-soluble resins, water-dispersible resins, solvent-soluble resins, and non-water-dispersible resins are preferred. Moreover, these resin components may have crosslinking reactivity. When a resin component having crosslinking reactivity is used, the durability, water resistance, weather resistance, chemical resistance, adhesion, etc. of the film can be improved.

As the coloring pigment, for example, known inorganic coloring pigments, organic coloring pigments, etc. can be used. By appropriately using one or more of these colored pigments, it is possible to set the topcoat material to a desired color tone. The mixing ratio of the colored pigment in the colored top coating material is preferably 1 to 500 parts by weight, more preferably 5 to 200 parts by weight, and even more preferably 10 to 150 parts by weight, based on 100 parts by weight of the solid content of the resin component. .

Such a top coat material may contain various components other than the above-mentioned components as long as the effects of the present invention are not significantly impaired. Examples of such ingredients include thickeners, film-forming aids, leveling agents, wetting agents, plasticizers, antifreeze agents, pH adjusters, extender pigments, preservatives, antifungal agents, antialgal agents, and antibacterial agents. agent, dispersant, antifoaming agent, adsorbent, fiber, crosslinking agent, coupling agent, ultraviolet absorber, light stabilizer, antioxidant, anti-staining agent, hydrophilic agent, water repellent, catalyst, solvent, Examples include water. The top coating material of the present invention can be manufactured by uniformly mixing the resin component, the coloring pigment, and, if necessary, the various components described above, by a conventional method. The form of the top coating material can be, for example, a one-component type, a two-component type, or a multi-component type. Furthermore, examples of the degree of gloss of the top coating material include glossy, 7-minute gloss, 5-minute gloss, 3-minute gloss, and matte.

Specifically, the top coating materials include, for example, weather-resistant top coat paints for construction (JIS K5658:2010), weather-resistant paints for steel structures (JIS K5659:2008), and glossy synthetic resin emulsion paints (JIS K5660:2008). , synthetic resin emulsion paint (JIS K5663:2008), multicolored pattern paint (JIS K5667:2003), synthetic resin emulsion pattern paint (JIS K5668:2010), acrylic resin non-aqueous dispersion type paint (JIS K5670:2008), roofing Examples include high solar reflectance paint (JIS K5675:2011).

In applying the top coat material, known painting equipment can be used. As the painting tool, for example, a spray, a roller, a brush, etc. can be used.
The amount of the top coat material to be applied may be set as appropriate depending on the surface shape of the existing wall, the type of top coat material, the type of painting equipment, etc., but is preferably 0.05 to 0.5 kg/m ² , more preferably It is 0.1 to 0.4 kg/ ^m2 . At the time of painting, the top coat material can be diluted as necessary.

In the present invention, one type or two or more types of top coating materials can be used. When using two or more types of topcoat materials, it is also possible to achieve a multicolored appearance of two or more colors by using topcoat materials with different tones and performing separate coatings.

Examples are shown below to clarify the features of the present invention.

[Test Example 1]
In Test Example 1, the following undercoat materials 1-1 to 1-11 were prepared as undercoat materials, and tests were conducted using these undercoat materials.

(Undercoat material 1-1)
Non-water dispersible acrylic polyol {hydroxyl value: 50 KOHmg/g, weight average molecular weight: 70000, glass transition temperature: 38°C, solid content: 50% by weight, medium: mineral spirit (aniline point 42°C)}, powder m1 ( A base agent containing titanium oxide, average particle size: 0.3 μm, oil absorption: 13 ml/100 g, specific gravity: 4.2), amide wax, solvent naphtha (aniline point: 13 ° C.), and a silicone antifoaming agent;
A mixture of a polyisocyanate compound (1,6-diisocyanatohexane derivative, solid content: 100% by weight), a tetraalkoxysilane compound (isobutyl alcohol modified product of tetramethoxysilane condensate), and a curing agent containing mineral spirit ( NCO/OH ratio: 1.0).
Pigment volume concentration: 14%, non-volatile content of undercoating material: 61% by weight, ratio of compound having reactive silyl group in resin solid content: 0.5% by weight ( _SiO2 conversion), powder amount: solid of resin component Thickener amount (solid content): 1 part by weight per 100 parts by weight of solid content of the resin component.

(Undercoating material 1-2)
A base agent containing a non-aqueous dispersible acrylic polyol (same as above), powder m1 (same as above), amide wax, solvent naphtha, and a silicone antifoaming agent;
A mixture of a polyisocyanate compound (same as above), a tetraalkoxysilane compound (same as above), and a curing agent containing mineral spirit (NCO/OH ratio: 1.0).
Pigment volume concentration: 22%, non-volatile content of undercoating material: 63% by weight, ratio of compound having reactive silyl group in resin solid content: 0.5% by weight ( _SiO2 conversion), powder amount: solid of resin component 120 parts by weight per 100 parts by weight, thickener amount (solid content): 0.8 parts by weight per 100 parts by weight of solid content of the resin component.

(Undercoat material 1-3)
Non-aqueous dispersion type acrylic polyol (same as above), powder n1 (hydrated silicon dioxide, average particle size: 6 μm, oil absorption: 340 ml/100 g, specific gravity: 2.0), amide wax, solvent naphtha, and silicone antifoaming agent A base agent containing;
A mixture of a polyisocyanate compound (same as above), a tetraalkoxysilane compound (same as above), and a curing agent containing mineral spirit (NCO/OH ratio: 1.0).
Pigment volume concentration: 7%, non-volatile content of undercoating material: 59% by weight, ratio of compound having reactive silyl group in resin solid content: 0.5% by weight ( _SiO2 conversion), powder amount: solid of resin component Amount of thickener (solid content): 1.2 parts by weight per 100 parts by weight of solid content of the resin component.

(Undercoating material 1-4)
A base agent containing a non-aqueous dispersible acrylic polyol (same as above), powder n1 (same as above), amide wax, solvent naphtha, and a silicone antifoaming agent;
A mixture of a polyisocyanate compound (same as above), a tetraalkoxysilane compound (same as above), and a curing agent containing mineral spirit (NCO/OH ratio: 1.0).
Pigment volume concentration: 13%, non-volatile content of undercoating material: 57% by weight, ratio of compound having reactive silyl group in resin solid content: 0.5% by weight ( _SiO2 conversion), powder amount: solid of resin component Thickener amount (solid content): 1 part by weight per 100 parts by weight of solid content of the resin component.

(Undercoat material 1-5)
A base agent containing a non-aqueous dispersible acrylic polyol (same as above), powder n1 (same as above), amide wax, solvent naphtha, and a silicone antifoaming agent;
A mixture of a polyisocyanate compound (same as above), a tetraalkoxysilane compound (same as above), and a curing agent containing mineral spirit (NCO/OH ratio: 1.0).
Pigment volume concentration: 20%, non-volatile content of undercoating material: 58% by weight, ratio of compound having reactive silyl group in resin solid content: 0.5% by weight ( _SiO2 conversion), powder amount: solid of resin component 50 parts by weight per 100 parts by weight, thickener amount (solid content): 0.8 parts by weight per 100 parts by weight of solid content of the resin component.

(Undercoat material 1-6)
A base agent containing a non-aqueous dispersible acrylic polyol (same as above), powder n1 (same as above), amide wax, solvent naphtha, and a silicone antifoaming agent;
A mixture of a polyisocyanate compound (same as above), a tetraalkoxysilane compound (same as above), and a curing agent containing mineral spirit (NCO/OH ratio: 1.0).
Pigment volume concentration: 25%, non-volatile content of undercoating material: 58% by weight, ratio of compound having reactive silyl group in resin solid content: 0.5% by weight ( _SiO2 conversion), powder amount: solid of resin component Thickener amount (solid content): 0.6 parts by weight per 100 parts by weight of the solid content of the resin component.

(Undercoat material 1-7)
Non-aqueous dispersible acrylic polyol (same as above), powder n2 (hydrated silicon dioxide, average particle size: 10 μm, oil absorption: 310 ml/100 g, specific gravity: 2.0), amide wax, solvent naphtha, and silicone antifoaming agent A base agent containing;
A mixture of a polyisocyanate compound (same as above), a tetraalkoxysilane compound (same as above), and a curing agent containing mineral spirit (NCO/OH ratio: 1.0).
Pigment volume concentration: 25%, non-volatile content of undercoating material: 58% by weight, ratio of compound having reactive silyl group in resin solid content: 0.5% by weight ( _SiO2 conversion), powder amount: solid of resin component 66 parts by weight per 100 parts by weight, thickener amount (solid content): 0.6 parts by weight per 100 parts by weight of solid content of the resin component.

(Undercoat material 1-8)
A base agent containing a non-aqueous dispersible acrylic polyol (same as above), powder m1 (same as above), powder n2 (same as above), amide wax, solvent naphtha, and a silicone antifoaming agent;
A mixture of a polyisocyanate compound (as above), a tetraalkoxysilane compound (as above), and a curing agent containing mineral spirits (NCO/OH ratio 1.0).
Pigment volume concentration: 24%, non-volatile content of undercoating material: 58% by weight, ratio of compound having reactive silyl group in resin solid content: 0.5% by weight ( _SiO2 conversion), powder amount: solid of resin component Powder m1 is 50 parts by weight, powder n2 is 40 parts by weight, and thickener amount (solid content): 0.8 parts by weight per 100 parts by weight of the solid content of the resin component.

(Undercoating material 1-9)
A base agent containing a non-aqueous dispersible acrylic polyol (same as above), powder m1 (same as above), amide wax, solvent naphtha, and a silicone antifoaming agent;
A mixture of a polyisocyanate compound (same as above), a tetraalkoxysilane compound (same as above), and a curing agent containing mineral spirit (NCO/OH ratio: 1.0).
Pigment volume concentration: 14%, non-volatile content of undercoating material: 61% by weight, ratio of compound having a reactive silyl group in resin solid content: 3% by weight (calculated as _SiO2 ), powder amount: solid content of resin component 100 70 parts by weight per part by weight, thickener amount (solid content): 1 part by weight per 100 parts by weight of solid content of the resin component.

(Undercoating material 1-10)
Non-water dispersible acrylic polyol (same as above), powder o1 (calcium carbonate, average particle size: 6 μm, oil absorption: 20 ml/100 g, specific gravity: 2.6), amide wax, solvent naphtha, and silicone antifoaming agent. A base agent containing;
A mixture of a polyisocyanate compound (same as above), a tetraalkoxysilane compound (same as above), and a curing agent containing mineral spirit (NCO/OH ratio: 1.0).
Pigment volume concentration: 7%, non-volatile content of undercoating material: 61% by weight, ratio of compound having reactive silyl group in resin solid content: 0.5% by weight ( _SiO2 conversion), powder amount: solid of resin component Amount of thickener (solid content): 1.5 parts by weight per 100 parts by weight of solid content of the resin component.

(Undercoat material 1-11)
Non-water dispersible acrylic polyol (same as above), powder O2 (calcium carbonate, average particle size: 24 μm, oil absorption: 20 ml/100 g, specific gravity: 2.6), amide wax, solvent naphtha, and silicone antifoaming agent. A base agent containing;
A mixture of a polyisocyanate compound (same as above), a tetraalkoxysilane compound (same as above), and a curing agent containing mineral spirit (NCO/OH ratio: 1.0).
Pigment volume concentration: 7%, non-volatile content of undercoating material: 61% by weight, ratio of compound having reactive silyl group in resin solid content: 0.5% by weight ( _SiO2 conversion), powder amount: solid of resin component Amount of thickener (solid content): 1.5 parts by weight per 100 parts by weight of solid content of the resin component.

(Test example 1-1)
○Test i
The existing wall surface is made of brown ceramic siding that has deteriorated due to outdoor exposure (the surface has protrusions and depressions (joints) similar to tile joints, the protrusions have irregular patterns, and the outermost coating is inorganic). (with a clear coating) was prepared. Primer material 1-1 was spray coated on the entire surface of this existing wall at a coating amount of 0.1 kg/m ² and allowed to dry. Here, the coating of undercoat material 1-1 has a color tone that is significantly different from that of the existing wall surface (color difference: 40), and the undercoat material film was evenly formed over the entire uneven pattern of the existing wall surface while taking advantage of the uneven pattern. This could be easily confirmed. Next, a test specimen was prepared by spray painting a top coat material (light brown acrylic silicone resin paint) at a coating amount of 0.2 kg/m ² and drying and curing for 7 days. The painting and curing steps were all performed under standard conditions (temperature 23° C., relative humidity 50%).

After exposing the test specimen prepared by the above method to an accelerated weathering tester (Metal Weather; manufactured by Daipra Wintes Co., Ltd.) for 500 hours, changes in the appearance of the test specimen surface (lifting, peeling) were observed. did. Next, a cross cut was made in the film at each part of the uneven pattern using a cutter knife, and a tape was attached to the cross cut part and then peeled off to check the adhesion. As a result, in Test Example 1-1, there was no change in appearance due to the accelerated weathering test, and no peeling was observed at any part.

○Test ii
The existing wall surface is made of brown ceramic siding that has deteriorated due to outdoor exposure (the surface has protrusions and depressions (joints) similar to tile joints, and the protrusions have an irregular pattern of irregularities, and fluorine resin is used as the outermost coating) (with a clear coating) was prepared. Using this existing wall surface, a test body was prepared in the same manner as Test i, and a test was conducted.

○Test iii
The existing wall surface is made of brown ceramic siding that has deteriorated due to outdoor exposure (the surface has protrusions and depressions (joints) similar to tile joints, and the protrusions have an irregular pattern of irregularities, and acrylic silicone is used as the outermost layer coating. (with a colored resin coating) was prepared. Using this existing wall surface, a test body was prepared in the same manner as Test i, and a test was conducted.

The test results are shown in Table 1. In Table 1, regarding the condition after applying the undercoat material, "A" means that the color difference between the existing wall surface and the undercoat film is 10 or more or the difference in gloss level is 15 or more, and "A" means that the color difference between the existing wall surface and the undercoat film is 5 or more. If the color difference between the existing wall surface and the undercoat material is 3 or more and less than 5 or the gloss difference is 5 or more and less than 10, it is ``C''. A four-level rating (excellent: A>B>C>D: poor) was given, with "D" indicating a color difference of less than 3 or a gloss difference of less than 5 between the wall surface and the undercoat film. The evaluation in the accelerated weathering test is "A" if there is no change in appearance or peeling at any part, and "A" if there is a clear change in appearance or if there is a lot of peeling. There were four grades of "D" (excellent: A>B>C>D: poor).

(Test example 1-2)
A test specimen was prepared and tested in the same manner as in Test Example 1-1, except that undercoat material 1-2 was used instead of undercoat material 1-1. After applying base coat material 1-2, the color tone of the base coat material 1-2 film is significantly different from that of the existing wall surface, and the base coat film is evenly formed over the entire uneven pattern of the existing wall surface, taking advantage of the uneven pattern. It was possible to easily confirm that The test results are shown in Table 1.

(Test example 1-3)
A test specimen was prepared and tested in the same manner as in Test Example 1-1, except that primer material 1-3 was used instead of primer material 1-1. After applying the base coat 1-3, the gloss of the base coat 1-3 is significantly different from that of the existing wall surface, and the base coat film is evenly applied to the entire uneven pattern of the existing wall while taking advantage of the uneven pattern. It was possible to easily confirm that it had been formed. The test results are shown in Table 1.

(Test example 1-4)
A test specimen was prepared and tested in the same manner as in Test Example 1-1, except that undercoat material 1-4 was used instead of undercoat material 1-1. After applying the base coat 1-4, the gloss of the base coat 1-4 is significantly different from that of the existing wall surface, and the base coat film is evenly applied to the entire uneven pattern of the existing wall while taking advantage of the uneven pattern. It was possible to easily confirm that it had been formed. The test results are shown in Table 1.

(Test example 1-5)
A test specimen was prepared and tested in the same manner as in Test Example 1-1, except that undercoat material 1-5 was used instead of undercoat material 1-1. After applying base coat material 1-5, the gloss of base coat material 1-5 is significantly different from that of the existing wall surface, and the base coat film is applied evenly over the entire uneven pattern of the existing wall surface, taking advantage of the uneven pattern. It was possible to easily confirm that it had been formed. The test results are shown in Table 1.

(Test Example 1-6)
A test specimen was prepared and tested in the same manner as in Test Example 1-1, except that undercoat material 1-6 was used instead of undercoat material 1-1. After applying the base coat 1-6, the gloss of the base coat 1-6 is significantly different from that of the existing wall surface, and the base coat film is evenly applied to the entire uneven pattern of the existing wall while taking advantage of the uneven pattern. It was possible to easily confirm that it had been formed. The test results are shown in Table 1.

(Test Example 1-7)
A test specimen was prepared and tested in the same manner as in Test Example 1-1, except that primer material 1-7 was used instead of primer material 1-1. After applying the base coat 1-7, the gloss of the base coat 1-7 is significantly different from that of the existing wall surface, and the base coat film is evenly applied to the entire uneven pattern of the existing wall while taking advantage of the uneven pattern. It was possible to easily confirm that it had been formed. The test results are shown in Table 1.

(Test Example 1-8)
A test specimen was prepared and tested in the same manner as in Test Example 1-1, except that undercoat material 1-8 was used instead of undercoat material 1-1. After applying base coat material 1-8, the film of base coat material 1-8 is significantly different in color tone and gloss from the existing wall surface, and the base coat material is applied evenly over the entire uneven pattern of the existing wall surface, taking advantage of the uneven pattern. It was easily confirmed that a film had been formed. The test results are shown in Table 1.

(Test Example 1-9)
A test specimen was prepared and tested in the same manner as in Test Example 1-1, except that primer material 1-9 was used instead of primer material 1-1. After applying the base coat 1-9, the color tone of the base coat 1-9 is significantly different from that of the existing wall surface, and the base coat film is evenly formed over the entire uneven pattern of the existing wall, taking advantage of the uneven pattern. It was possible to easily confirm that The test results are shown in Table 1.

(Test Example 1-10)
A test specimen was prepared and tested in the same manner as in Test Example 1-1, except that undercoat material 1-10 was used instead of undercoat material 1-1. After applying Primer 1-10, the film of Primer 1-10 showed no difference in color tone or difference in gloss from the existing wall surface, and evenly covered the entire uneven pattern of the existing wall surface. It was not easy to confirm that the primer film had been formed. The test results are shown in Table 1.

(Test Example 1-11)
A test specimen was prepared and tested in the same manner as in Test Example 1-1, except that undercoat material 1-11 was used instead of undercoat material 1-1. After applying the primer material 1-11, the film of the primer material 1-11 showed no difference in color tone or difference in gloss from the existing wall surface, and evenly covered the entire uneven pattern of the existing wall surface. It was not easy to confirm that the primer film had been formed. The test results are shown in Table 1.

Test Examples 1-1 to 1-9 correspond to Examples and had generally better results than Test Examples 1-10 and 1-11 (corresponding to Comparative Examples).

[Test Example 2]
In Test Example 2, undercoat materials 2-1 to 2-12 were prepared by combining the following main ingredients Q1 to Q7 and curing agents R1 to 5, and tests were conducted using these undercoat materials.

(Main agent Q1)
Epoxy resin a {dimer acid-modified epoxy resin solution, solid content: 60% by weight, epoxy equivalent (per solid content): 780 g/eq, medium: mineral spirit (aniline point 42°C) and solvent naphtha (aniline point 13°C)} 75 parts by weight, 18 parts by weight of powder m1 (titanium oxide, average particle size: 0.3 μm , oil absorption: 13 ml/100 g, specific gravity: 4.2), 4 parts by weight of solvent naphtha (same as above), additives ( 4 parts by weight of dispersant, thickener, and antifoaming agent were uniformly mixed in a conventional manner to produce base material Q1.

(Main agent Q2)
62 parts by weight of epoxy resin a (same as above), 30 parts by weight of powder m1 (same as above), 4 parts by weight of solvent naphtha (same as above), and 4 parts by weight of additives (dispersant, thickener, and antifoaming agent) in a conventional manner. The mixture was mixed uniformly to produce base ingredient Q2.

(Main agent Q3)
55 parts by weight of epoxy resin a (same as above), 35 parts by weight of powder m1 (same as above), 6 parts by weight of solvent naphtha (same as above), and 4 parts by weight of additives (dispersant, thickener, and antifoaming agent) in a conventional manner. The mixture was mixed uniformly to produce base ingredient Q3.

(Main agent Q4)
38 parts by weight of epoxy resin a (same as above), 15 parts by weight of powder m1 (same as above), 30 parts by weight of heavy calcium carbonate (specific gravity 2.7), 12 parts by weight of solvent naphtha (same as above), additives (dispersant, 5 parts by weight of adhesive (viscous agent and antifoaming agent) were uniformly mixed in a conventional manner to produce main ingredient Q4.

(Main agent Q5)
65 parts by weight of epoxy resin a (same as above), 29 parts by weight of solvent naphtha (same as above), and 6 parts by weight of additives (thickener and antifoaming agent) were uniformly mixed in a conventional manner to produce base material Q5.

(Main agent Q6)
40 parts by weight of epoxy resin a (same as above), 50 parts by weight of solvent naphtha (same as above), and 10 parts by weight of additives (thickener and antifoaming agent) were uniformly mixed in a conventional manner to produce base material Q6.

(Main agent Q7)
65 parts by weight of epoxy resin A (same as above), 18 parts by weight of powder O1 (calcium carbonate, average particle size: 6 μm, oil absorption: 20ml/100g, specific gravity: 2.6), 12 parts by weight of solvent naphtha (same as above), added 5 parts by weight of agents (thickener and antifoaming agent) were uniformly mixed in a conventional manner to produce base material Q7.

(Main agent Q8)
Epoxy resin b {aqueous epoxy resin (aqueous dispersion of bisphenol A type epoxy resin), solid content: 45% by weight, epoxy equivalent (per solid content) 510 g/eq, medium: water} 60 parts by weight, powder m1 (same as above) ), 3 parts by weight of an ether solvent, and 2 parts by weight of additives (dispersant, thickener, and antifoaming agent) were uniformly mixed in a conventional manner to produce base material Q8.

(Curing agent R1)
Polyamine compound a {aliphatic polyamide amine, solid content: 100% by weight, active hydrogen equivalent (per solid content): 80 g/eq} 15 parts by weight, silane compound {N-(2-aminoethyl)-3-aminopropylmethyl 4 parts by weight of dimethoxysilane, 16 parts by weight of an alcohol solvent, and 65 parts by weight of solvent naphtha (same as above) were uniformly mixed in a conventional manner to produce a curing agent R1.

(Curing agent R2)
15 parts by weight of polyamine compound a (same as above), 16 parts by weight of alcohol solvent, and 69 parts by weight of solvent naphtha (same as above) were uniformly mixed in a conventional manner to produce curing agent R2.

(Curing agent R3)
Polyamine compound b {aliphatic polyamide amine, solid content: 100% by weight, active hydrogen equivalent (per solid content): 180 g/eq} 25 parts by weight, silane compound (same as above) 4 parts by weight, alcohol solvent 11 parts by weight, solvent A curing agent R3 was prepared by uniformly mixing 60 parts by weight of naphtha (same as above) in a conventional manner.

(Curing agent R4)
Polyamine compound c {water-soluble modified aliphatic polyamine resin, solid content: 80% by weight, active hydrogen equivalent (per solid content): 140 g/eq, medium: water} 35 parts by weight, silane compound (same as above) 65 parts by weight were uniformly mixed in a conventional manner to produce curing agent R4.

(Curing agent R5)
75 parts by weight of polyamine compound c (same as above) and 25 parts by weight of silane compound (same as above) were uniformly mixed in a conventional manner to produce curing agent R5.

(Undercoat material 2-1)
The base material Q1 (100 parts by weight) and the curing agent R1 (25 parts by weight) were uniformly mixed to prepare an undercoat material 2-1. The characteristic values of this undercoating material are shown in Table 1,
Blending ratio of epoxy resin and amine curing agent [(Blending amount of polyamine compound/Active hydrogen equivalent of polyamine compound)/(Blending amount of epoxy resin/Epoxy equivalent of epoxy resin)] (expressed as "Blending ratio" in Table 1) is 0.81,
Pigment volume concentration is 8%,
The non-volatile content of the undercoating material (described as "non-volatile content" in Table 2) is 54% by weight,
The ratio of the compound having a reactive silyl group in the resin solid content (SiO ₂ equivalent, expressed as "SiO ₂ equivalent amount" in Table 2) is 0.5% by weight,
The amount of powder is 36 parts by weight per 100 parts by weight of the solid content of the resin component,
The amount of thickener (solid content) is 1.6 parts by weight per 100 parts by weight of solid content of the resin component.

(Undercoat material 2-2)
The base material Q2 (100 parts by weight) and the curing agent R1 (20 parts by weight) were uniformly mixed to prepare an undercoat material 2-2. The characteristic values of this undercoat material 2-2 are as shown in Table 2.

(Undercoat material 2-3)
The base material Q3 (100 parts by weight) and the curing agent R1 (18 parts by weight) were uniformly mixed to prepare an undercoat material 2-3. The characteristic values of this undercoat material 2-3 are as shown in Table 2.

(Undercoat material 2-4)
The base material Q2 (100 parts by weight) and the curing agent R1 (22 parts by weight) were uniformly mixed to prepare an undercoat material 2-4. Each characteristic value of this undercoat material 2-4 is as shown in Table 2.

(Undercoat material 2-5)
The base material Q2 (100 parts by weight) and the curing agent R1 (30 parts by weight) were uniformly mixed to prepare an undercoat material 2-5. The characteristic values of this undercoat material 2-5 are as shown in Table 2.

(Undercoat material 2-6)
The base material Q2 (100 parts by weight) and the curing agent R2 (20 parts by weight) were uniformly mixed to prepare an undercoat material 2-6. Each characteristic value of this undercoat material 2-6 is as shown in Table 2.

(Undercoat material 2-7)
The base material Q2 (100 parts by weight) and the curing agent R3 (28 parts by weight) were uniformly mixed to prepare an undercoat material 2-7. The characteristic values of this undercoat material 2-7 are as shown in Table 2.

(Undercoat material 2-8)
The base material Q4 (100 parts by weight) and the curing agent R3 (16 parts by weight) were uniformly mixed to prepare an undercoat material 2-8. The characteristic values of this undercoat material 2-8 are as shown in Table 2.

(Undercoat material 2-9)
The base material Q5 (100 parts by weight) and the curing agent R3 (28 parts by weight) were uniformly mixed to prepare an undercoat material 2-9. The characteristic values of this undercoat material 2-9 are as shown in Table 2.

(Undercoat material 2-10)
The base material Q6 (100 parts by weight) and the curing agent R3 (17 parts by weight) were uniformly mixed to prepare an undercoat material 2-10. The characteristic values of this undercoat material 2-10 are as shown in Table 2.

(Undercoat material 2-11)
The base material Q7 (100 parts by weight) and the curing agent R3 (28 parts by weight) were uniformly mixed to prepare an undercoat material 2-11. Each characteristic value of this undercoat material 2-11 is as shown in Table 2.

(Undercoat material 2-12)
The base material Q8 (100 parts by weight) and the curing agent R4 (20 parts by weight) were uniformly mixed to prepare an undercoat material 2-12. The characteristic values of this undercoat material 2-12 are as shown in Table 2.

(Undercoat material 2-13)
The base material Q8 (100 parts by weight) and the curing agent R5 (10 parts by weight) were uniformly mixed to prepare an undercoat material 2-13. Each characteristic value of this undercoat material 2-13 is as shown in Table 2.

(Test examples 2-1 to 2-13)
Test specimens were prepared and tested in the same manner as in Test Example 1-1, except that each of the undercoating materials 2-1 to 2-13 was used instead of the undercoating material 1-1. The test results are shown in Table 3. Among these, in Test Examples 2-1 to 2-8, 2-12, and 2-13 (corresponding to Examples), the color tone of the primer coating was different from the color tone of the existing wall surface. It can be easily confirmed that the undercoat film is evenly formed over the entire uneven pattern, and the results are generally better than Test Examples 2-9, 2-10, and 2-11 (corresponding to comparative examples). Met.

Claims (2)

A method of decorating existing walls that have deteriorated over time,
The existing wall surface has an uneven pattern on its surface,
It is equipped with at least one existing coating selected from an inorganic coating, an organic-inorganic composite coating, and a fluororesin coating,
For the existing wall above,
A resin component, and a powder (m) with an average particle diameter of 1 μm or less and/or a powder (n) with an oil absorption of 100 ml/100 g or more and an average particle diameter of 2 to 100 μm ,
The powder (n) is one or two selected from zeolite, sodium sulfate, alumina, allophane, diatomaceous earth, hydrated silicon dioxide, vermiculite, perlite, Oya stone powder, activated clay, charcoal, activated carbon, wood powder, and shirasu balloon. That's all,
The total amount of the powder (m) and the powder (n) is 10 to 250 parts by weight based on 100 parts by weight of the solid content of the resin component , and the pigment volume concentration is 1 to 30% . A makeup method characterized by applying a topcoat material after the film has dried.
The above oil absorption amount is a value measured by the method of JIS K5101-13-1:2004 "Refined linseed oil method". 2. The decorative method according to claim 1, wherein the existing wall surface has an uneven pattern on the surface and is constituted by a plurality of plate-shaped wall materials provided with an existing coating.