WO2024053635A1

WO2024053635A1 - Water-based siloxane coating composition for wood materials and wood-based materials

Info

Publication number: WO2024053635A1
Application number: PCT/JP2023/032337
Authority: WO
Inventors: 康英中井
Original assignee: 日東紡績株式会社
Priority date: 2022-09-09
Filing date: 2023-09-05
Publication date: 2024-03-14

Abstract

The present invention addresses the problem of providing: a water-based siloxane coating composition for wood materials and wood-based materials, which contains substantially no alcohol and is excellent in the permeability into wood materials and wood-based materials and the protection properties for wood materials and wood-based materials, can provide excellent textures of wood materials, and has excellent storage stability; and a use of the water-based siloxane coating composition. The problem can be solved by a coating composition for wood materials and wood-based materials, which comprises (a) a water-based siloxane compound having an amino group, (b) a water-based compound having an epoxy group or a polyol group, and a water-based solvent, in which the ratio of the mass A of the component (a) to the mass B of the component (b), i.e., A/B, is 0.08 to 14, the composition contains no alcohol or contains an alcohol at a content of 5% by mass or less, and the pH value of the composition is 7 or more.

Description

Water-based siloxane coating composition for wood and wood-based materials

The present invention relates to a coating composition for wood and wood-based materials, and more specifically to a water-based siloxane coating for wood and wood-based materials containing an aqueous siloxane compound having an amino group, an aqueous compound having a specific functional group, and an aqueous solvent. A composition for wood and wood materials that can achieve excellent penetration into wood and wood materials, protection, wood texture, and storage stability without using alcohol or using a reduced amount of alcohol. This invention relates to an aqueous siloxane coating composition for wood materials and its uses.

BACKGROUND OF THE INVENTION Wood and wood-based materials are often coated from the viewpoints of scratch prevention, waterproofing, stain resistance, etc., and various coating compositions that have excellent permeability and protection properties for wood and wood-based materials have been proposed. Some of these coating compositions contain volatile organic solvents such as alcohol from the viewpoint of permeability and storage stability. In view of the above considerations, there is a strong need for aqueous coating compositions that do not contain volatile organic solvents.
Various aqueous siloxane coating compositions containing amino groups or epoxy groups have been proposed as aqueous siloxane coating compositions that are substantially free of volatile organic solvents, and application to wood has also been suggested (e.g., cited in (See references 1 to 4). However, no experimental results or data have been reported to demonstrate its effectiveness in actual use in coating wood or wood-based materials, and therefore, formulation of a water-based siloxane coating composition suitable for coating wood or wood-based materials has not been reported. Even for those skilled in the art, the design guidelines were not clear.

Special Publication No. 2010-537016 Japanese Patent Application Publication No. 2011-246636 Special Publication No. 2012-524162 Special Publication No. 2014-515771

In view of the limitations of the prior art described above, the present invention provides a substantially alcohol-free aqueous siloxane coating composition that improves the penetration, protection, wood texture, and storage stability of wood and wood-based materials. An object of the present invention is to provide an excellent coating composition for wood and wood-based materials and uses thereof.

As a result of extensive studies, the present inventors found that in an aqueous siloxane coating composition for wood and wood materials containing (a) an aqueous siloxane compound having an amino group, (b) an aqueous compound having a specific functional group, and an aqueous solvent, (b) The ratio A/B of the mass A of the component (a) to the mass B of the component and the pH of the coating composition are each within a predetermined range, thereby eliminating the use of alcohol or reducing its usage amount. The present inventors have discovered that it is possible to achieve excellent permeability to wood and wood materials, protection properties, texture of wood, and storage stability, and have completed the present invention.
That is, the present invention
[1]
(a) an aqueous siloxane compound having an amino group;
(b) an aqueous compound having an epoxy group or a polyol group;
an aqueous solvent;
A coating composition for wood and wood-based materials comprising:
The ratio A/B of the mass A of the component (a) to the mass B of the component (b) is 0.08 to 14,
The composition does not contain alcohol or has an alcohol content of 5% by mass or less,
The present invention relates to the coating composition for wood and wood materials, wherein the composition has a pH value of 7 or more.
Note that the term "coating composition for wood and wood-based materials" as used herein means that it is sufficient if it can be used for either a coating for wood or a coating for wood-based materials, and includes a coating composition that can be used only for coating for wood. Both coating compositions that can be used exclusively as coatings for wood materials are within the scope of the present invention.

Furthermore, the following [2] to [13] are all preferred aspects or embodiments of the present invention.
[2]
The coating composition for wood and wood materials according to [1], wherein the composition has a pH of 10 or more.
[3]
The coating composition for wood and wood materials according to [1] or [2], wherein the composition has a pH of 13 or less.
[4]
The coating composition for wood and wood materials according to any one of [1] to [3], wherein the solid content of the composition is 15.0% by mass to 50.0% by mass.
[5]
The coating composition for wood and wood materials according to any one of [1] to [4], wherein the component (b) is an aqueous epoxy compound.
[6]
The coating composition for wood and wood materials according to any one of [1] to [5], which can form a coating layer having antifouling properties.
[7]
A method of imparting stain resistance to wood or wood materials using the coating composition for wood and wood materials according to any one of [1] to [6].
[8]
A coated wood or wood material having a coating layer obtained by curing the coating composition for wood and wood materials according to any one of [1] to [6].
[9]
The coated wood or wood material according to [8], wherein the wood is solid wood or the wood material contains solid wood.
[10]
Furniture, building components, stationery, tableware, or sporting goods, comprising the coated wood or wood material according to [8] or [9].
[11]
A method for manufacturing furniture, building materials, stationery, tableware, or sporting goods, comprising the step of implementing the method described in [7].
[12]
A member comprising a coating layer obtained by curing the coating composition for wood and wood-based materials according to any one of [1] to [6], and a base material made of wood or wood-based materials.
[13]
The member according to [12], wherein the coating amount of the coating layer is 0.01 to 1.0 g per 100 cm ² of area of the base material.

According to the present invention, it is possible to achieve excellent permeability to wood and wood materials, protection properties, texture of wood, and storage stability without using alcohol or reducing the amount of alcohol used. Various uses are provided, such as coating compositions for materials and coated wood or wood-based materials.
The coating composition does not use alcohol or uses a small amount of alcohol, so it is easy to manage and transport, and there are usually no working environment or health considerations. Since it has excellent protection properties, wood texture, storage stability, etc., it can be particularly suitably used in coating wooden members used for furniture, building materials, stationery, tableware, etc.

The present invention provides (a) an aqueous siloxane compound having an amino group;
(b) an aqueous compound having an epoxy group or a polyol group;
A coating composition for wood and wood materials comprising an aqueous solvent,
The ratio A/B of the mass A of the component (a) to the mass B of the component (b) is 0.08 to 14,
The composition does not contain alcohol or has an alcohol content of 5% by mass or less,
The coating composition for wood and wood-based materials, wherein the composition has a pH value of 7 or more.
That is, the coating composition for wood and wood materials of the present invention contains (a) an aqueous siloxane compound having an amino group, and (b) an aqueous compound having an epoxy group or a polyol group in a predetermined mass proportion.
The coating composition for wood and wood materials of the present invention may be composed only of (a) an aqueous siloxane compound having an amino group, and (b) an aqueous compound having an epoxy group or a polyol group; In addition to the aqueous siloxane compound having a group and (b) the aqueous compound having an epoxy group or a polyol group, other components may be contained.
The coating composition for wood and wood-based materials of the present invention contains an aqueous solvent such as water.

(a) Aqueous siloxane compound having an amino group The (a) aqueous siloxane compound having an amino group used in the present invention may be any aqueous compound having one or more amino groups and a siloxane skeleton; There are no restrictions.
Here, "aqueous" means that when a solution with a concentration of 30% by mass in which the solvent is water and the solute is (a) a siloxane compound having an amino group is formed and stored at 25°C for one month, precipitation occurs. This means that it can be visually confirmed that the dissolved state is maintained stably without any separation or separation. In order to realize affinity for water, (a) the aqueous siloxane compound having an amino group preferably has a polar group such as a hydroxy group.
(a) The aqueous siloxane compound having an amino group may have one amino group, or may have two or more amino groups. Here, the amino group may be any of a primary amino group, a secondary amino group, and a tertiary amino group, and (a) the aqueous siloxane compound having an amino group has two or more amino groups. In some cases, all of the amino groups may be of the same series or may be a combination of amino groups of different series.
From the viewpoints of reactivity during coating formation, protection for wood, storage stability, etc., (a) the aqueous siloxane compound having an amino group preferably has two or more amino groups. From the viewpoint of availability, cost, storage stability, etc., it is preferable to have 2 to 4 amino groups, and for example, so-called diaminosiloxane having 2 amino groups can be preferably used.

Specific examples of diaminosiloxanes preferably used as component (a) in the present invention include the following general formula (1):
H ₂ N-Z-(SiR ₂ O) _m -SiR ₂ -Z-NH ₂ -(1)
(wherein R is independently a hydroxy group, an unsubstituted or substituted hydrocarbon group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 8 carbon atoms, an alkenoxy group, or a cycloalkoxy group, Z is independently a single bond or an unsubstituted or substituted divalent hydrocarbon group having 1 to 8 carbon atoms which may contain an ether bond in the chain, and m is an integer of 1 to 100. ), and compounds represented by general formula (1) in which one or both of --NH ₂ is replaced with a secondary or tertiary amino group.
From the viewpoint of not using alcohol or reducing the amount of alcohol used, it is preferable that at least one R in formula (1) is a hydroxy group. In addition, from the viewpoint of making it easier to reduce the alcohol content of the coating composition for wood and wood materials of the present invention to 5% by mass or less, the weight of alcohol that can be liberated from component (a) is determined based on the weight of the entire compound. It is preferably 5% or less based on weight.
In formula (1), m is preferably from 1 to 7, particularly preferably from 1 to 3.
In formula (1), Z is preferably a single bond or an alkyl group having 1 to 3 carbon atoms, and particularly preferably a single bond.

More specific examples of diaminosiloxanes preferably used as component (a) in the present invention include 1,3-diamino-1,1,3,3-tetrahydroxydisiloxane, 1,3-bis(3-amino propyl)-1,1,3,3-tetrahydroxydisiloxane, 1,3-bis(4-aminobutyl)-1,1,3,3-tetrahydroxydisiloxane, 1,3-bis(4-amino phenoxy)-1,1,3,3-tetrahydroxydisiloxane, 1,3-bis(N-phenyl-3-aminopropyl)-1,1,3,3-tetrahydroxydisiloxane, etc. .

Preferred examples of compounds when using an aqueous siloxane compound having more than two amino groups as component (a) in the present invention include the above-mentioned diaminosiloxane, in which one or both of the amino groups are replaced with an ethylenediamine group, an aminoethyl- Examples include those substituted with 3-aminopropyl group, 3-ureidopropyl group, etc.
These (a) aqueous siloxane compounds having an amino group may be used alone or in combination of two or more.

(b) Aqueous compound having epoxy group or polyol group (b) Aqueous compound having epoxy group or polyol group has at least one group selected from the group consisting of epoxy group and polyol group.
Here, the term "polyol group" refers to a group in which two or more of the hydrogen atoms constituting a hydrocarbon group are substituted with hydroxyl groups. Having a polyol group is more effective in achieving the effects of the present invention, such as being able to suppress deterioration in texture such as fluffing of wood or wood materials after washing with running water due to the water absorption action of two or more polyol groups. can contribute to
The hydrocarbon group in the polyol group is not particularly limited, but alkyl groups, vinyl groups, allyl groups, etc. are preferred, and alkyl groups are particularly preferred.
There is no particular restriction on the number of hydroxyl groups in the polyol group, but it is preferably from 2 to 8, and particularly preferably 2.
It is particularly preferred that the polyol group is an alkylene glycol group. Here, "alkylene glycol group" means a functional group in which an alkyl chain is substituted with two hydroxyl groups, and specific examples include the following general formula (2).
-CH(OH) _CH2OH- (2)
A functional group having a structure represented by:
(b) The aqueous compound having an epoxy group or a polyol group may be a compound having no repeating units, or a so-called polymer or oligomer having repeating units. From the viewpoint of protection for wood, etc., it is preferable to use a so-called polymer or oligomer having repeating units, and from the viewpoint of cost, storage stability, etc., it is preferable to use a compound without repeating units.

(b) The aqueous compound having an epoxy group or polyol group may have one epoxy group or polyol group, or may have two or more epoxy groups or polyol groups. When it has two or more epoxy groups or polyol groups, all of them may be epoxy groups, all of them may be polyol groups, or it may have a combination of epoxy groups and polyol groups. .

(bi) Aqueous siloxane compound having an epoxy group or polyol group The aqueous siloxane compound having an epoxy group or a polyol group preferably used as component (b) in the present invention has one or more epoxy groups and/or one or more polyol groups. There are no other restrictions as long as it is an aqueous compound that has a siloxane skeleton and a siloxane skeleton.
(bi) The aqueous siloxane compound having an epoxy group or a polyol group is particularly selected as the component (b) from the viewpoint of affinity with the (a) aqueous siloxane compound having an amino group, protection against wood, storage stability, etc. It can be preferably used.

(bi) The aqueous siloxane compound having an epoxy group or a polyol group may have one epoxy group or polyol group, or may have two or more epoxy groups or polyol groups. When it has two or more epoxy groups or polyol groups, all of them may be epoxy groups, all of them may be polyol groups, or it may have a combination of epoxy groups and polyol groups. .
From the viewpoints of reactivity during coating formation, protection for wood, texture of wood, etc., (bi) an aqueous siloxane compound having an epoxy group or a polyol group has a total of two or more epoxy groups and/or polyol groups. It is preferable to have. From the viewpoint of availability, cost, storage stability, etc., it is preferable to have a total of 2 to 4 epoxy groups and/or polyol groups.

(bi) As a preferable example of the aqueous siloxane compound having an epoxy group or a polyol group, the amino group in the above-mentioned diamino siloxane, preferably a diamino siloxane having a structure represented by formula (1), is substituted with an epoxy group or a polyol group. I can list things.

(bii) Epoxy compound (b) The aqueous compound having an epoxy group or polyol group preferably has an epoxy group, that is, it is preferably (bii) an epoxy compound.
(bii) The epoxy compound may have one epoxy group, or may have two or more epoxy groups.

(bii) Examples of preferred compounds as the epoxy compound include ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, phenol (EO) ₅ glycidyl ether, 2-ethylhexyl glycidyl ether, phenyl glycidyl ether, 2-phenylphenol glycidyl ether, p -tert-butylphenylglycidyl ether, N-glycidyl phthalimide, sorbitol polyglycidyl ether, glycerol polyglycidyl ether, diglycerol polyglycidyl ether, polyglycerol polyglycidyl ether, trimethylolpropane polyglycidyl ether, and the like.
(bii) There is no particular restriction on the epoxy equivalent of the epoxy compound, but 80 g/eq. From 1000g/eq. It is preferable that it is 100g/eq. From 600g/eq. It is more preferable that

Coating composition for wood and wood materials The coating composition for wood and wood materials of the present invention comprises the above-mentioned (a) an aqueous siloxane compound having an amino group, and (b) an aqueous compound having an epoxy group or a polyol group. and the ratio A/B of the mass A of the component (a) to the mass B of the component (b) is from 0.08 to 14.
Here, the mass A of the aqueous siloxane compound having an amino group (a) is the mass of the aqueous siloxane compound itself having an amino group, and therefore, the mass A of the aqueous siloxane compound having an amino group is the mass of the aqueous siloxane compound having an amino group. If it is provided dissolved or dispersed in (a) the weight of the amino group-containing aqueous siloxane compound itself from its solid content, etc., and this is used as the weight A to calculate the ratio A/B. . When a plurality of types of (a) components are contained in the coating composition, the mass A is the sum of the masses of these (a) components.
Similarly, the mass B of an aqueous compound having (b) an epoxy group or a polyol group is the mass of the aqueous compound itself (b) having an epoxy group or a polyol group; If the aqueous compound is provided dissolved or dispersed in a solvent such as water, (b) calculate the mass of the aqueous compound itself having an epoxy group or polyol group from its solid content, etc.; Calculate the ratio A/B as mass B. When a plurality of types of (b) components are contained in the coating composition, the mass B is the sum of the masses of these (b) components.

By having the above ratio A/B within the range of 0.08 to 14 and having the other technical features of the present invention, the coating composition for wood and wood materials of the present invention has excellent wood Also, it is possible to realize permeability to wood materials, protection properties, wood texture, storage stability, etc.
From the viewpoint of realizing these preferable technical effects more effectively, the ratio A/B is preferably within the range of 0.2 to 12, more preferably within the range of 1 to 10, It is more preferably within the range of 2 to 8, and particularly preferably within the range of 4 to 6.
The above ratio A/B can be adjusted as appropriate by adjusting the mixing ratio of each starting material during production of the coating composition.

The coating composition for wood and wood-based materials of the present invention contains an aqueous solvent such as water.
The aqueous solvent in this embodiment refers to a solvent selected from water, various solvents having an affinity for water, and mixed solvents thereof. As the aqueous solvent, it is preferable to use water or a mixed solvent having a water content of 50% by mass or more.
Preferred examples of solvents that have an affinity for water include inorganic acids or aqueous solutions thereof such as hydrochloric acid, sulfuric acid, phosphoric acid, and polyphosphoric acid; organic acids or aqueous solutions thereof such as formic acid, acetic acid, propionic acid, and lactic acid; and zinc chloride. , aqueous solutions of inorganic acid salts such as calcium chloride and magnesium chloride. These may be used alone or in combination of two or more.

The coating composition for wood and wood materials of the present invention does not contain alcohol, or if it contains alcohol, the content is 5% by mass or less.
Since the coating composition for wood and wood materials of the present invention does not contain alcohol or has an alcohol content of 5% by mass or less, it is easy to manage and transport, and it does not affect the working environment or health when used. It is highly convenient in practice, as no countermeasures are usually required.
The alcohol content is preferably 3% by mass or less, more preferably 1% by mass or less, and particularly preferably 0.5% by mass or less.
The alcohol content can be measured, for example, by gas chromatography or headspace gas chromatography according to JIS K5601. When measured by headspace gas chromatography, for example, when the peak of the organic solvent detected in the measurement is 5%, the alcohol content is 5% by mass or less.
In addition, the alcohol content of each component, such as component (a) and component (b), is measured by the method described above, and based on the alcohol content of each component, the coating composition for wood and wood materials of the present invention is determined. You may also calculate the alcohol content of a product.

It is preferable that the coating composition for wood and wood materials of the present invention does not contain not only alcohol but also VOC (volatile organic compounds) at all, or has a total VOC content of 5% by mass or less.
Since the coating composition for wood and wood-based materials of this embodiment does not contain any VOCs or has a total content of 5% by mass or less, it is easier to manage and transport, and it is easy to use in the working environment. It is even more convenient in practical terms, with less need for health-related measures.
The total VOC content is more preferably 3% by mass or less, even more preferably 1% by mass or less in total, and particularly preferably 0.5% by mass or less.

The coating composition for wood and wood-based materials of the present invention has a pH of 7 or more.
By having a pH of 7 or more and having other technical features of the present invention, the coating composition for wood and wood materials of the present invention does not use VOCs such as alcohol or uses less VOCs. It is possible to achieve excellent permeability to wood and wood materials, protection properties, texture of wood, storage stability, etc. while reducing

From the viewpoint of realizing these preferable technical effects more effectively, the pH of the coating composition for wood and wood materials of the present invention is preferably 10 or more, more preferably 10 or more and 13 or less, and 11 or more. to 12 is particularly preferred. By having a pH of 10 or more, the coating composition for wood and wood-based materials of the present embodiment exhibits excellent permeability into wood and wood-based materials, and provides even higher protection against repeated contamination. Can maintain dirtiness.

The pH of the coating composition for wood and wood-based materials of the present invention can be measured using a glass electrode pH meter or the like, and more specifically, by the method described in the Examples of the present application.
The pH of the coating composition for wood and wood materials of the present invention is determined by the type and use of each component such as (a) an aqueous siloxane compound having an amino group, (b) an aqueous compound having an epoxy group or a polyol group, and an aqueous solvent. It can be adjusted appropriately by adjusting the amount. Furthermore, the pH of the coating composition for wood and wood materials can be adjusted by using various additives such as pH adjusters as necessary.

There is no particular restriction on the solid content of the coating composition for wood and wood materials of the present invention, and the usage and storage conditions of the coating composition may vary depending on (a) an aqueous siloxane compound having an amino group, (b) an epoxy group, or It may be set as appropriate depending on the characteristics of each component such as the aqueous compound having a polyol group and the aqueous solvent, but from the viewpoint of protection to wood, storage stability, etc. It is preferably 20.0% by mass to 40.0% by mass, particularly preferably 25.0% to 35.0% by mass, and 25.0% by mass to 35.0% by mass. Most preferably, it is 30.0% by weight.

Other Components The coating composition for wood and wood materials of the present invention contains (a) an aqueous siloxane compound having an amino group, (b) an aqueous compound having an epoxy group or a polyol group, and an aqueous solvent according to the present invention. It may contain other components, such as ordinary coating additives, as long as they do not contradict the purpose.
Other ingredients include preservatives, color pigments, extender pigments, pigment dispersants, surface conditioners, antifoaming agents, thickeners, curing catalysts, surfactants, anti-settling agents, softeners, plasticizers, and reactivity. Examples include diluents, antifreeze agents, antiskinning agents, pH adjusters, and the like.
Further, antioxidants, ultraviolet inhibitors, antifoaming agents, etc. may be added.

Wood and wood materials There are no particular restrictions on the wood and wood materials to which the coating composition for wood and wood materials of the present invention is applied, and they may be sawn timber (solid wood) or processed wood made from wood chips or fibers. Alternatively, it may be recycled wood made by hardening wood powder with resin. The processed wood or recycled wood may be plywood, laminated wood, laminated wood, particle board, MDF, or the like.
Also, the type of wood is not particularly limited, and it may be one type alone or a combination of two or more types of various types of wood, such as cypress wood, cedar wood, hiba wood, oak wood, tung wood, zelkova wood, and Japanese mackerel wood. It's okay. Further, the part is not particularly limited, and the coating composition of the present invention can be applied to various parts such as straight grain, straight grain, white thick meat, lean meat, and board grain.
The coating composition for wood and wood-based materials of the present invention has excellent stain resistance and excellent permeability into wood and/or wood-based materials, so it can be used even on compressed wood, which is generally difficult for coating agents to penetrate. It also has high practical value in that it is relatively easy to form a coating layer with excellent stain resistance on compressed wood.

Coated wood or wood-based material By applying the coating composition for wood and wood-based materials of the present invention onto wood or wood-based materials and curing it, a coating (layer) is formed on the wood or wood-based material, and coated wood is obtained. Or wood materials can be manufactured. Although heating is not essential for curing, the curing time can be shortened by heating.
More specifically, the coating composition for wood and wood-based materials of the present invention can be applied to the surface of wood or wood-based materials by methods such as dipping, spray coating, roll coating, and brush coating. A coating (layer) may be formed by one application, or a coating (layer) may be formed by repeating two or more applications. When forming a coating (layer) by repeating two or more applications, the coating composition may be cured after application and then further applied, or the application may be repeated without curing until all applications are completed. After this is completed, the coating composition may be cured.
There is no particular restriction on the amount of coating composition for wood and wood materials, but it is preferably 0.01 g to 1.0 g, and 0.1 g to 0.5 g per 100 cm ² of wood or wood material. It is particularly preferable that there be. If the applied amount is less than 0.01 g per 100 cm ² of wood or wood material, it is difficult to exhibit stain resistance, and if it exceeds 1.0 g, it is difficult to obtain the texture of wood or wood material.
A coating amount within the above range indicates better penetration into wood and wood-based materials.
Incidentally, the permeability into wood and wood materials can also be evaluated by visual observation after dropping onto wood or wood materials, and more specifically, for example, can be evaluated by the method described in the Examples of the present application. .

The thickness of the coating (layer) after curing is not particularly limited, and can be set as appropriate depending on the purpose of the coating, required physical properties, usage of the coated wood or wood material, etc., but it is 30 μm or less. It is preferably 15 μm or less, and particularly preferably 15 μm or less.

The coating composition for wood and wood-based materials of the present invention has excellent permeability into wood and wood-based materials, and can form a coating layer with excellent stain resistance, protection properties, wood texture, etc. The coated wood or wood-based material of the embodiment is applicable to applications where wood or wood-based materials are widely used from the viewpoint of aesthetics and texture, and where protection by coating is required, such as furniture, building components, stationery, tableware, sporting goods, etc. It can be used particularly suitably.

Hereinafter, the present invention will be explained in more detail with reference to Examples/Comparative Examples, but the present invention is not limited thereto in any way.

In the following examples/comparative examples, physical properties/characteristics were evaluated by the following methods.
Ratio A/B of mass A of component (a) to mass B of component (b)
The mass A of component (a) is determined from the amount of solid content in component (a) used, the mass B of component (b) is determined from the amount of solid content in component (b) used, and the mass ratio is calculated from these. A/B was calculated.
pH of coating composition
The pH of the sample prepared as a coating composition in each Example/Comparative Example was measured using pH test paper (manufactured by MACHEREY-NAGEL).
Solid content/non-volatile content Samples prepared as coating compositions in each example/comparative example were dried at 105°C for 1 hour in accordance with the Japanese Industrial Standard JIS K5601-1-2 heating residue test method for paint components. The heating residue was measured.
Alcohol content The alcohol content of each component used in the preparation of the coating composition in each example/comparative example was measured by gas chromatography according to Japanese Industrial Standard JIS K5601, and based on the results, the alcohol content of the entire coating composition was determined. The content was calculated.
Solution Appearance The appearance (transparency and fluidity) of the samples prepared as coating compositions in each Example/Comparative Example was visually observed.
Storage Stability The coating compositions of Examples/Comparative Examples were prepared and stored at 25° C. for one month from the time of preparation, and then their storage stability was evaluated according to the following criteria.
Good: There was no change from the state immediately after preparation, and transparency and fluidity were maintained.
×: Changed from the state immediately after preparation, and did not maintain transparency and fluidity.
Penetration One drop of the coating composition obtained in each example and comparative example was dropped onto an MDF (medium density fiber) board or solid wood using a dropper, and the degree of penetration into the MDF board or solid wood was measured. A visual evaluation was made as ○ if it soaked in quickly, △ if it soaked in after a few minutes, and × if it hardly soaked in.
Application amount The coating composition obtained in each example and comparative example was applied onto a 10 x 10 x 1 cm size MDF (medium density fiber) board or solid wood to an extent that no liquid pooled, and the coating composition was kept at room temperature for 24 hours. Dry. Furthermore, the same operation was carried out on the next day and the day after, and coating and drying were performed three times in total. The weight of the coated MDF board or solid wood after the third drying was measured, and the additional amount (g) from the initial weight per area (100 cm ² ) was defined as the coating amount.
Stain resistance (water-based magic pen)
After drying the coated MDF board or solid wood for the third time, mark it arbitrarily with a water-based marker and wash it off with running water. Those with no residue were rated as ○, those with a slight amount of contamination remaining were rated as △, and those that could hardly be washed away were rated as ×. Furthermore, the same operation was repeated four times after the wood surface was dried.
Stain resistance (oil-based magic pen)
After the third drying process, write on the coating surface of the coated MDF board or solid wood using a permanent marker and wipe it off with ethanol. Those with a slight amount of contamination remaining were rated △, and those that could hardly be wiped off were rated ×.
Appearance (woody texture)
After drying the coated MDF board or solid wood for the third time, mark it arbitrarily with a water-based marker and judge the wood texture after rinsing with running water. ), and those that lost their woody texture (whitening of the coating surface, fluffing, etc.) were evaluated as × (fail).

(Example 1)
As the (a) component, (a-1) 1 part by mass (solid content basis) of amino group-containing aqueous siloxane (Shin-Etsu Silicone KBP-90 manufactured by Shin-Etsu Chemical Co., Ltd.), as the (b) component, (b-1) 1 part by mass (solid content basis) of alkylene glycol group-containing aqueous siloxane (Shin-Etsu Silicone X-12-1098, manufactured by Shin-Etsu Chemical Co., Ltd.) was added to prepare the aqueous siloxane coating composition of Example 1.
Using the obtained aqueous siloxane coating composition, the solution appearance and storage stability were evaluated, and a coating film was formed on an MDF board with a size of 10 x 10 x 1 cm according to the method described above, and the coating amount, permeability, The stain resistance and appearance (woody texture) were evaluated.
The results are shown in Table 1.

(Examples 2 to 17, Comparative Examples 1 to 15)
An aqueous siloxane coating composition was prepared in the same manner as in Example 1, except that the components and/or amounts used were changed to those listed in Table 1, Table 2, or Table 3.
Using the obtained aqueous siloxane coating composition, the solution appearance and storage stability were evaluated, and a coating film was formed on an MDF board with a size of 10 x 10 x 1 cm according to the method described above, and the permeability and antifouling properties were evaluated. , and the appearance (woody texture) were evaluated.
The results are shown in Table 1, Table 2 or Table 3.

In addition, details of each component described in Table 1, Table 2, and Table 3 used in each of the above Examples/Comparative Examples are as follows.
(a) Aqueous siloxane compound having an amino group (a-1)
Amino group-containing aqueous siloxane Shin-Etsu Silicone KBP-90 manufactured by Shin-Etsu Chemical Co., Ltd.
・(a-2)
Aqueous siloxane containing ethylene diamino group Shin-Etsu Silicone KBP-64 manufactured by Shin-Etsu Chemical Co., Ltd.

(b) Aqueous compound having an epoxy group or polyol group (b-1)
Alkylene glycol group-containing aqueous siloxane Shin-Etsu Silicone X-12-1098 manufactured by Shin-Etsu Chemical Co., Ltd.
・(b-2)
Epoxy group-containing aqueous siloxane Dynasylan HYDROSIL 2926 manufactured by Evonik
・(b-3)
Ethylene glycol diglycidyl ether bifunctional type, epoxy equivalent 113g/eq.
Denacol EX-810 manufactured by Nagase ChemteX Co., Ltd.
・(b-4)
Polyethylene glycol diglycidyl ether bifunctional type, epoxy equivalent 268g/eq.
Denacol EX-830 manufactured by Nagase ChemteX Co., Ltd.
・(b-5)
Polyethylene glycol diglycidyl ether bifunctional type, epoxy equivalent 551g/eq.
Denacol EX-861 manufactured by Nagase ChemteX Co., Ltd.
・(b-6)
Phenol (EO) _5- glycidyl ether monofunctional type, epoxy equivalent 400g/eq.
Denacol EX-145 manufactured by Nagase ChemteX Co., Ltd.
・(b-7)
Sorbitol polyglycidyl ether multifunctional type, epoxy equivalent 173g/eq.
Denacol EX-614B manufactured by Nagase ChemteX Co., Ltd.

(c) Aqueous compound having neither epoxy group nor polyol group・(c-1)
Aqueous siloxane containing trimethylammonium chloride group Shin-Etsu Silicone X-12-1126 manufactured by Shin-Etsu Chemical Co., Ltd.
・(c-2)
Carboxyl group-containing aqueous siloxane Shin-Etsu Silicone X-12-1135 manufactured by Shin-Etsu Chemical Co., Ltd.

(Examples 18 to 23)
Except that the water-based siloxane coating composition prepared in Example 1, Example 3, Example 4, Example 5, Example 2, or Example 9 was used, and cypress wood was coated instead of MDF board. A coating film was formed on cypress wood in the same manner as in Example 1, and the coating amount, permeability, and stain resistance were evaluated.
Furthermore, using the same water-based siloxane coating composition, a coating film was formed on oak wood in the same manner as in Example 1, except that oak wood was coated instead of the MDF board, and the coating amount, permeability, and antifouling properties were evaluated.
The results are shown in Table 4.

It can be seen that the coating composition for wood and wood-based materials of the present invention is a suitable coating composition that has excellent permeability, stain resistance, etc., even for various types of typical solid wood.

The coating composition for wood and wood-based materials of the present invention is easy to manage and transport, and has little impact on the working environment and health, while improving its permeability to wood and wood-based materials, protection, wood texture, and storage stability. Because of its excellent properties, it has high applicability in various industrial fields such as architecture, construction, and furniture manufacturing.

Claims

(a) an aqueous siloxane compound having an amino group;
(b) an aqueous compound having an epoxy group or a polyol group;
an aqueous solvent;
A coating composition for wood and wood-based materials comprising:
The ratio A/B of the mass A of the component (a) to the mass B of the component (b) is 0.08 to 14,
The composition does not contain alcohol or has an alcohol content of 5% by mass or less,
The coating composition for wood and wood-based materials, wherein the composition has a pH of 7 or more.
The coating composition for wood and wood materials according to claim 1, wherein the composition has a pH of 10 or more.
The coating composition for wood and wood materials according to claim 1 or 2, wherein the composition has a pH of 13 or less.
The coating composition for wood and wood materials according to any one of claims 1 to 3, wherein the solid content of the composition is 15.0% by mass to 50.0% by mass.
The coating composition for wood and wood materials according to any one of claims 1 to 4, wherein the component (b) is an aqueous epoxy compound.
The coating composition for wood and wood-based materials according to any one of claims 1 to 5, which is capable of forming a coating layer having antifouling properties.
A method for imparting stain resistance to wood or wood-based materials using the coating composition for wood and wood-based materials according to any one of claims 1 to 6.
A coated wood or wood material having a coating layer formed by curing the coating composition for wood and wood materials according to any one of claims 1 to 6.
The coated wood or wood material according to claim 8, wherein the wood is solid wood or the wood material contains solid wood.
Furniture, building components, stationery, tableware, or sporting goods, comprising the coated wood or wood material according to claim 8 or 9.
A method for manufacturing furniture, building materials, stationery, tableware, or sporting goods, comprising the step of implementing the method according to claim 7.
A member comprising a coating layer formed by curing the coating composition for wood and wood-based materials according to any one of claims 1 to 6, and a base material made of wood or wood-based materials.
The member according to claim 12, wherein the coating amount of the coating layer is 0.01 to 1.0 g per 100 cm 2 of area of the substrate.