Water-based aerosol paint concentrate, and water-based aerosol paint containing water-based aerosol paint concentrate

Abstract

To provide an aqueous aerosol paint stock solution that is excellent in aerosol suitability, and can provide a high level of film performance, and an aqueous aerosol paint containing aqueous aerosol paint stock solution.SOLUTION: By modifying a dispersion resin, it is possible to provide an aqueous aerosol paint stock solution that has spray workability equivalent to conventional aerosol paints and a larger average particle size than conventional aerosol paints, thus excelling in aerosol suitability and providing high-level coating performance, as well as aqueous aerosol paints that include the aqueous aerosol paint stock solution.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to an aqueous aerosol paint stock solution and an aqueous aerosol paint containing the aqueous aerosol paint stock solution. More specifically, the present invention relates to an aqueous aerosol paint stock solution that is excellent in aerosol suitability and can provide high-level coating film performance, and an aqueous aerosol paint containing the aqueous aerosol paint stock solution.

Background Art

[0002] In consideration of the burden on the natural environment, many proposals have been made for the development of water-based paints using water as a solvent. Even in aerosol paints, the development of aqueous aerosol paints has become mainstream, differing from the development of conventional lacquer-based aerosol paints. For example, Patent Document 1 proposes an aqueous aerosol paint composition that is excellent in adhesion to a coated object, non-brittleness, non-tackiness, water resistance, etc., and can be suitably used for repairing coated parts with household paints and coated products with industrial paints by blending a water-dilutable resin in a specific weight average molecular weight range and an emulsion of a resin in a specific weight average molecular weight range at a specific ratio. Patent Document 2 proposes an aqueous aerosol paint stock solution and an aqueous aerosol paint composition that can sufficiently reduce the amount of VOC and are excellent in storage stability and coating film performance by using a dispersion resin as a binder. Aqueous aerosol paints have problems in aerosol suitability such as storage stability and drying properties, and coating film performance such as water resistance and coating film durability because they use water-soluble resins (which have a lower molecular weight and a higher acid value compared to the resins used in lacquer-based aerosol paints). Based on this problem, many aqueous aerosol paints have been proposed so far, but the development of an aqueous aerosol paint that can provide both high-level aerosol suitability and coating film performance (especially high-level coating film performance) has not been achieved yet.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

[0004] In view of the above circumstances, the present invention was completed by diligently studying various resins and compounding ratios, resulting in a water-based aerosol paint concentrate and water-based aerosol paint that have excellent aerosol suitability and can provide a high level of coating film performance. [Means for solving the problem]

[0005] The invention according to claim 1 is an aqueous aerosol paint concentrate for use in aqueous aerosol paints, wherein the aqueous aerosol paint concentrate is Of the 100 parts by weight of the raw materials for water-based aerosol paint, (a) a dispersion resin, (b) 50 to 60 parts by weight of water, (c) 10 to 20 parts by weight of a co-solvent, (d) 1 part by weight or less of a pigment, and (e) an additive, wherein the dispersion resin is an alkyd resin or an acrylic-modified alkyd resin. The dispersion resin contains particles with an average particle size of approximately 100 nm to 200 nm. This invention relates to a water-based aerosol paint concentrate having a resin solid content of 25 parts by weight or more and 35 parts by weight or less.

[0006] The invention according to claim 2 relates to the aqueous aerosol paint concentrate according to claim 1, wherein the dispersion resin is an acrylic-modified alkyd resin.

[0009] The invention according to claim 5 relates to the aqueous aerosol paint concentrate according to claim 1, wherein the co-solvent is butyl cellosolve.

[0010] The invention according to claim 6 relates to the aqueous aerosol paint concentrate according to claim 2, wherein the co-solvent is butyl cellosolve.

[0013] The invention according to claim 9 relates to an aqueous aerosol paint containing an aqueous aerosol paint concentrate and a propellant as described in any one of claims 1 to 8, wherein the propellant is contained in an amount of 70 parts by weight or more and 90 parts by weight or less per 100 parts by weight of the aqueous aerosol paint concentrate, and the propellant is dimethyl ether. [Effects of the Invention]

[0014] According to the invention of claim 1, the present invention provides an aqueous aerosol paint concentrate for use in aqueous aerosol paints, wherein the aqueous aerosol paint concentrate comprises (a) a dispersion resin, (b) 50 to 60 parts by weight of water, (c) 10 to 20 parts by weight of a co-solvent, (d) 1 part by weight or less of a pigment, and (e) an additive, wherein the dispersion resin is an alkyd resin or an acrylic-modified alkyd resin, and the resin solids content is 25 to 35 parts by weight. This provides the advantageous effect of providing an aqueous aerosol paint concentrate that is excellent in aerosol suitability and has a high level of coating film performance. Furthermore, since the dispersion resin is characterized by being an aqueous aerosol paint concentrate according to claim 1, containing particles with an average particle size of approximately 100 nm to 200 nm, it has the advantageous effect of providing an aqueous aerosol paint concentrate that is even more aerosol-compatible and has a high level of coating film performance, by having an average particle size larger than the particle size in dispersions (dispersion solutions) that are normally used in aerosol paints.

[0015] According to the invention of claim 2, the aqueous aerosol paint concentrate described in claim 1 is characterized in that the dispersion resin is an acrylic-modified alkyd resin. Therefore, by modifying the resin, it is possible to provide an aqueous aerosol paint concentrate that is even more aerosol-compatible and has a high level of coating film performance.

[0018] According to the invention of claim 5, the co-solvent is butyl cellosolve, and the aqueous aerosol paint concentrate is as described in claim 1. Therefore, by specifying the type of co-solvent, it is possible to provide an aqueous aerosol paint concentrate that is even more aerosol-compatible and has a high level of coating film performance, which is an advantageous effect.

[0019] According to the invention of claim 6, the co-solvent is butyl cellosolve, and the aqueous aerosol paint concentrate is as described in claim 2. Therefore, by specifying the type of co-solvent, it is possible to provide an aqueous aerosol paint concentrate that is even more aerosol-compatible and has a high level of coating film performance, which is an advantageous effect.

[0022] According to the invention of claim 9, the present invention provides an aqueous aerosol paint containing an aqueous aerosol paint concentrate and a propellant as described in any one of claims 1 to 8, wherein the propellant is contained in an amount of 70 parts by weight or more and 90 parts by weight or less per 100 parts by weight of the aqueous aerosol paint concentrate, and the propellant is dimethyl ether. This provides the advantageous effect of providing an aqueous aerosol paint that has excellent aerosol suitability and high level of coating film performance. [Modes for carrying out the invention]

[0023] The following describes in detail embodiments of the aqueous aerosol paint concentrate and the aqueous aerosol paint containing the aqueous aerosol paint concentrate according to the present invention, but the technical scope of the present invention should not be limited by these descriptions.

[0024] The aqueous aerosol paint concentrate according to the present invention is the core concentrate of the paint product, which effectively determines the performance of the paint when producing an aqueous aerosol paint that has excellent aerosol suitability and can provide a high level of coating film performance. The aqueous aerosol paint concentrate according to the present invention comprises a dispersion resin, water, a co-solvent, a pigment, and additives. The aqueous aerosol paint concentrate according to the present invention is designed to have a resin solid content of 20 parts by weight or more and 40 parts by weight or less, preferably 25 parts by weight or more and 35 parts by weight or less. By setting the resin solid content to a range of 20 to 40 parts by weight, adhesion is not significantly reduced, the sprayability (or atomization) is good when sprayed as an aerosol paint, the sprayed paint does not drip easily, and a paint film with a clean appearance can be obtained. When the resin solid content is less than 20 parts by weight, the sprayed paint is likely to sag, and the formed paint film may not have sufficient paint film performance. When the resin solid content exceeds 40 parts by weight, the atomization property (or atomizing property) deteriorates when spray as an aerosol paint, and a paint film with poor appearance finish may be formed.

[0025] The aqueous aerosol paint according to the present invention contains an aqueous aerosol paint stock solution, a propellant, and an additive. The blending ratio of the aqueous aerosol paint according to the present invention is designed such that, with respect to 100 parts by weight of the aqueous aerosol paint stock solution, the propellant is contained in an amount of 60 parts by weight or more and 95 parts by weight or less, and preferably the propellant is contained in an amount of 70 parts by weight or more and 90 parts by weight or less. If it is less than 60 parts by weight, the paint viscosity becomes too high, making it difficult to manufacture, and it does not turn into a mist when sprayed. On the other hand, if it exceeds 95 parts by weight, it is likely to sag when sprayed onto an object, and a beautiful paint film cannot be obtained. Therefore, the content of the propellant is preferably 60 parts by weight or more and 95 parts by weight or less.

[0026] The dispersion resin according to the present invention is a general term for resins dispersed in a solvent mainly composed of water. Examples include polyacrylic resin, polyurethane resin, epoxy resin, polyvinyl resin, polycarbonate resin, polyether resin, acetal resin, allyl resin, polyester resin, alkyd resin, fluororesin, polyethylene terephthalate (PET) resin. In the present invention, alkyd resin is preferred. The dispersion resin according to the present invention can be used as a resin C with new characteristics by chemically reacting (modifying) a certain resin B with the functional groups possessed by a certain resin A. For example, in the present invention, a resin (hereinafter referred to as an acrylic-modified alkyd resin) mainly composed of an alkyd resin and modified with a polyacrylic resin is preferred. The blending ratio of the dispersion resin according to the present invention is appropriately designed so that the resin solid content is 20 parts by weight or more and 40 parts by weight or less, and preferably 25 parts by weight or more and 35 parts by weight or less. By setting the resin solid content within the range of 20 to 40 parts by weight, the adhesion force is not significantly reduced, the atomization property (or atomizing property) is good when sprayed as an aerosol paint, the sprayed paint is not likely to drip, and a coating film with a beautiful appearance can be obtained. When the resin solid content is less than 20 parts by weight, the sprayed paint is likely to drip, and the produced coating film often does not have sufficient coating film performance. When the resin solid content exceeds 40 parts by weight, the atomization property (or atomizing property) deteriorates when sprayed as an aerosol paint, and a coating film with a poor appearance finish is often formed.

[0027] The water according to the present invention is not particularly limited in its type as long as it can sufficiently exhibit the functions (aerosol suitability and coating film performance) of the aqueous aerosol paint stock solution and the aqueous aerosol paint, but ion-exchanged water is preferably used. The mixing ratio of the water according to the present invention is preferably 40 to 70 parts by weight, more preferably 50 to 60 parts by weight, in the aqueous aerosol paint stock solution. When the mixing ratio of water is less than 40 parts by weight, the atomization property (or atomizing property) deteriorates when sprayed as an aerosol paint, and a coating film with a poor appearance finish may be formed. When the mixing ratio of water exceeds 70 parts by weight, the sprayed paint is likely to drip, the target film thickness cannot be sufficiently obtained, and the produced coating film may not have sufficient coating film performance.

[0028] The co-solvent according to the present invention is an organic solvent that has a high affinity for water and can be miscible with water in any proportion. Specifically, examples include methanol, ethanol, dimethyl ether, butyl cellosolve (ethylene glycol monobutyl ether), propylene glycol monomethyl ether (PM), diethylene glycol monobutyl ether, diethylene glycol, dioxane, acetic acid, dipropylene glycol n-butyl ether (DPnB), benzyl alcohol, 1,2-dimethoxyethane, diethylene glycol diethyl ether, pyridine, t-butyl alcohol, 2-propanol, acetone, N,N-dimethylformamide (DMF), acetonitrile, ethylene glycol, glycerin, etc., with butyl cellosolve being preferred. The blending ratio of the co-solvent according to the present invention is preferably 5.0 parts by weight or more and 30 parts by weight or less of the aqueous aerosol paint concentrate, and more preferably 10 parts by weight or more and 20 parts by weight or less. This is because, while it is desirable to reduce organic solvent components as much as possible from the perspective of the burden on the global environment, a co-solvent of 5.0 to 30 parts by weight is necessary due to manufacturing issues, the tendency to atomize when sprayed, and the need to achieve a clean finish. If the co-solvent ratio falls below 5.0 parts by weight, the dispersion resin may become incompatible with water, resulting in an unevenly formulated aerosol paint concentrate. Furthermore, it may not atomize well when sprayed, and the appearance of the resulting paint film may suffer. If the blending ratio of the co-solvent exceeds 30 parts by weight, it may become impossible to obtain a sufficient film thickness during painting, and as a result, it may not be possible to produce a coating with the desired coating performance according to the present invention.

[0029] The pigments according to the present invention include commonly used pigments such as titanium dioxide, iron oxide, carbon black, phthalocyanine blue, fast yellow, naphthol red, and yellow iron oxide, as well as rust-preventive pigments such as zinc powder, zinc phosphate, and aluminum tripolyphosphate. If necessary, extender pigments such as precipitated barium sulfate, calcium carbonate, talc, clay, and silica can also be suitably used. The blending ratio of the pigment according to the present invention is preferably 10 parts by weight or less, and more preferably 1.0 part by weight or less, of the aqueous aerosol paint concentrate. This is because the preparation of the aqueous aerosol paint concentrate of the present invention does not involve a dispersion process. If the pigment blending ratio exceeds 10 parts by weight, the pigment may not be uniformly dispersed in the concentrate when preparing the aerosol paint concentrate, and the quality stability of the final aerosol paint product may not be maintained. Here, the dispersion process refers to a series of steps to disperse the pigment in the stock solution using a disperser or the like to create fine particles. By performing the dispersion process, the finely particles of pigment can be stably present in the solution. When performing the dispersion process, the pigment blending ratio is not limited to 10.0 parts by weight or less, and can be arbitrarily designed as long as the present invention has excellent aerosol suitability and provides a high level of coating film performance.

[0030] The additives according to the present invention are a general term for substances added to aqueous aerosol paint concentrate and aqueous aerosol paints containing aqueous aerosol paint concentrate for the purpose of improving the coating film performance and spray workability, such as sprayability (or atomization) and drying properties during spray painting. Specifically, possible additives include plasticizers, leveling agents, dispersants, defoamers, color separation inhibitors, UV absorbers, antioxidants, surfactants, fungicides, preservatives, and antibacterial agents. However, these are not particularly limited as they are commonly used in the development of paint products and improve the coating performance or aerosol workability of the aqueous aerosol paint concentrate of the present invention and the aqueous aerosol paint containing the aqueous aerosol paint concentrate.

[0031] The aqueous aerosol paint according to the present invention is aerosolized using a propellant. Examples of propellants include dimethyl ether (DME) and LPG (liquefied petroleum gas), with dimethyl ether being preferred. The propellant (preferably dimethyl ether) can be mixed with LPG (liquefied petroleum gas) for use. The preferred mixing ratio of the propellant according to the present invention is 60 parts by weight or more and 95 parts by weight or less of the propellant per 100 parts by weight of the aqueous aerosol paint concentrate, and more preferably 70 parts by weight or more and 90 parts by weight or less of the propellant. If the proportion of propellant used is less than 60 parts by weight per 100 parts by weight of the aqueous aerosol paint concentrate, the sprayability (or atomization) may be poor when the aerosol paint is sprayed, and a paint film with a poor appearance may be formed. If the mixing ratio of the propellant exceeds 95 parts by weight per 100 parts by weight of the aqueous aerosol paint concentrate, it may not be possible to obtain a sufficient film thickness during painting, and as a result, it may not be possible to produce a paint film with the target paint film performance in this invention.

[0032] The aqueous aerosol paint concentrate and the aqueous aerosol paint containing the aqueous aerosol paint concentrate according to the present invention are developed and designed so that the average particle size of the resin in a dispersed state in the solvent is 75 nm to 250 nm, preferably 100 nm to 200 nm. If the average particle size is below 75 nm or above 250 nm, the sprayability during painting and the appearance of the resulting coating may be poor. The aqueous aerosol paint concentrate and the aqueous aerosol paint containing the aqueous aerosol paint concentrate according to the present invention have been developed with great care to improve the coating film performance by modifying the resin, and to maintain aerosol suitability even after the modification of the resin. By modifying the resin, the average particle size of the resin in the dispersion solution became much larger than the particle size of the resin in dispersion solutions typically used in aerosol paints. This allows for the application of a larger amount of resin to the target object in a single coat compared to conventional aerosol paints, and enables the creation of the desired film thickness (i.e., a film thickness that guarantees the desired coating performance) with fewer coats. Furthermore, with respect to the dispersion resin according to the present invention, since the resin modification is carried out with the premise of imparting functions required for a paint (for example, improved coating film performance such as weather resistance, water resistance, peel resistance, and chemical resistance), the resulting modified resin is often highly functional as a paint. In other words, this invention allows any user to aim for the development of a high-performance coating film by increasing the average particle size, while maintaining or improving the ease of use of conventional aerosol paints.

[0033] The average particle size according to the present invention is measured by particle size distribution measurement methods. Particle size distribution measurement methods include, for example, geometric particle size measurement methods using optical microscopes or electron microscopes, dynamic (inertial force) measurement methods by collecting particles using cascade impactors, measurement methods using electrical mobility with electrostatic particle size distribution analyzers (EAAs), measurement methods using light scattering with particle counters, measurement methods using diffusion deposition with diffusion batteries, and measurement methods using adiabatic expansion with condensation nucleus counters (CNCs). The average particle size according to this invention is measured by a dynamic (inertial force) measurement method that involves collecting particles using a cascade impactor.

[0034] The aqueous aerosol paint concentrate and the aqueous aerosol paint containing the aqueous aerosol paint concentrate according to the present invention also exhibit excellent storage stability. This is because the resin surface is designed to be easily solubilized with water and filling gas (or propellant).

[0035] In this invention, "approximately" means an error of 10% or less in a given number. For example, if it says "approximately 100," that number will be one of the values ​​within the range of "90 to 110." For example, if it says "approximately 200," that number refers to one of the numbers within the range of "180 to 220." [Examples]

[0036] The effects of the present invention will be further clarified by showing the following examples, comparative examples, and test results.

[0037] 135 ml of the aerosol paint concentrate from Examples 1 to 7 described below (approximately 100 parts by weight of the aerosol paint concentrate) was filled into an aerosol tin can, and then 165 ml of dimethyl ether was sealed in as a propellant to create the aerosol paint (approximately 80 parts by weight of the dimethyl ether). This aerosol paint was applied to a wooden test board in four coats (i.e., the aerosol paint was sprayed onto the test board in two back-and-forth motions) and allowed to dry. The following performance tests were performed on the obtained coating film. The thickness of the obtained coating film was approximately 30 μm to 40 μm. At the same time, the average particle size of the aerosol paint concentrate, its compatibility with gas, and the storage stability of the aerosol paint were also tested as described below.

[0038] (Average particle size) The average particle size according to the present invention was measured by a dynamic (inertial force) measurement method that involves collecting particles using a cascade impactor. (Compatibility with gases) When the aerosol paint concentrate and propellant were mixed, a uniform solution was marked with ◎ if it was visually apparent, and a state where they were completely incompatible was marked with ×. (Sprayability) The aerosol was applied for 10 seconds, and the mist condition was observed visually. Mist conditions that were acceptable for aerosol paint were marked with ◎, ○, and △, from no abnormalities to good. Mist conditions that were coarse or otherwise problematic for aerosol paint were marked with ×. (Appearance of the coating) After visual inspection, the paint films were marked with ◎, ○, and △ in order from those without problems, and × for those with problems. (Paint drips) The aerosol was applied in one go until the base was completely covered, and the test board was propped up vertically to observe the degree of sagging. We rated the aerosol paints as follows: ◎, ○, and △, in descending order of whether they did not drip or were otherwise normal, and ×, in which case the aerosol paints dripped. (Storage stability) The tests were conducted as follows, in accordance with the method of JIS K 5600 2-7. The samples were placed in containers, sealed, and stored at 45°C for 6 months. After returning to room temperature, the condition inside the containers, the ease of painting, the appearance of the paint film, and the degree of corrosion of the stored containers were examined and evaluated. Samples with no abnormalities were marked with ◎, ○, and △, respectively, while those showing a significant difference compared to before storage were marked with ×. (weather resistance) The test was conducted using the method specified in JIS K 5600 7-7 (xenon lamp method). (Coating film thickness: approximately 30 μm to 40 μm) Those showing no abnormalities are marked with ◎, ○, and △, respectively, while those showing a significant difference compared to before irradiation are marked with ×. (water resistance) A wooden test board (150mm x 70mm x 4.0mm thick) was spray-painted to a film thickness of approximately 30μm to 40μm, and dried at room temperature for 7 days to create a coating. Then, a few drops of water were added to the coating using a dropper, and the appearance of the coating was observed after 24 hours. Samples were marked with ◎, ○, and △, from best to worst, while samples where the coating peeled off, or where obvious stains remained on the coating and the gloss of the coating was no longer visible were marked with ×. (Alkali-resistant) A wooden test board (150mm x 70mm x 4.0mm thick) was spray-painted to a film thickness of approximately 30μm to 40μm, and dried at room temperature for 7 days to create a coating. Then, a few drops of saturated calcium hydroxide solution were added to the coating using a dropper, and the appearance of the coating was observed after 24 hours. The coatings were marked with ◎, ○, and △ in descending order of normality, while × indicated peeling of the coating, clear stains remaining on the coating, or loss of gloss. (non-adhesive) A wooden test board (150mm x 70mm x 4.0mm thick) was spray-painted to a film thickness of approximately 30μm to 40μm. After drying at room temperature for 7 days, five pieces of gauze were stacked, a 500g weight was placed in the center of the gauze, and it was left at 40°C for 4 hours. After that, the gauze was pulled away from the painted surface, and the degree of adhesion between the painted surface and the gauze, as well as the presence of cloth marks on the painted surface, were examined. ◎ was used to indicate no adhesion or cloth marks, ○ to indicate either of these, and × to indicate both. (flexibility) A test plate (150mm x 50mm x 0.6mm thick) of steel plate with a coating was bent at a 90-degree angle. The condition of the coating after bending was marked with ◎, ○, and △, in descending order of normality, and × for coatings that were completely cracked.

[0039] The mixing ratios of the aerosol paint concentrates for Examples 1 to 7 (Table 1), and the test results including the comparative examples (Table 2) are as follows. The dispersion resins listed in the mixing ratio of the aerosol paint concentrate (Table 1) are as follows: Acrylic-modified alkyd resin 1 Watersol WNW-524 (manufactured by DIC Corporation) Acrylic-modified alkyd resin 2 Watersol WPW-601 (manufactured by DIC Corporation) Acrylic-modified alkyd resin 3 Watersol BCD-3040 (manufactured by DIC Corporation) Alkyd 1 (no denaturation) This is the same alkyd resin as acrylic-modified alkyd resin 1, but without modification using acrylic resin. Comparative Examples 1, 2, and 3, used as comparative examples of the present invention, are as follows: Comparative Example 1 When using an acrylic resin having a molecular weight similar to that of acrylic-modified alkyd resin 1. Comparative Example 2 When using a urethane resin having a molecular weight similar to that of acrylic-modified alkyd resin 1. Comparative Example 3 When using a water-based multi-purpose spray (manufactured by Asahi Paint Co., Ltd., using water-soluble acrylic resin; the film thickness is approximately 15 μm to 25 μm when applied in four coats (i.e., spraying the aerosol paint twice back and forth onto the test plate)).

[0040] [Table 1]

[0041] [Table 2]

[0042] The following mixing ratios of propellants were investigated using the aerosol paint concentrate used in Example 1. Aerosol paints were prepared by changing the mixing ratio of the propellant (referred to as Ratio Example 1 to Ratio Example 4) using the aerosol paint stock solution from Example 1. Each of the prepared aerosol paints was applied to a wooden test board in four coats (i.e., the aerosol paint was sprayed onto the test board twice back and forth) and allowed to dry. The application of the aerosol paints at this time was evaluated to see if the aerosol paint could be sprayed sufficiently uniformly as aerosol particles and applied to the test board (atomization). The thickness of the obtained coating film was measured. The target coating film thickness was approximately 30 μm to 40 μm. The obtained test results are described below as the results of the aerosol paint mixing ratio study, and the test results for atomization and film thickness (Table 3).

[0043] [Table 3]

[0044] Based on the test results in Table 2, acrylic-modified alkyd resin 1 showed superior aerosol suitability and coating performance compared to Comparative Example 3 in the range of 25 to 35 parts by weight of resin solids (Examples 1 to 3). Acrylic and urethane showed a significant deterioration in gas compatibility and sprayability compared to acrylic-modified alkyd resin 1 and Comparative Example 3 (Comparative Examples 1 and 2). Therefore, acrylic and urethane were judged to have inferior aerosol suitability compared to acrylic-modified alkyd resin 1 and Comparative Example 3, and other aerosol suitability and coating film performance were not confirmed. It was shown that using butyl cellosolve as a co-solvent resulted in superior aerosolability, particularly in terms of paint sagging, compared to using alcohol (1-propanol) (Example 4). It was shown that without modification using acrylic resin, the weather resistance was worse than that of Comparative Example 3 (Example 5). Acrylic-modified alkyd resin 2 and acrylic-modified alkyd resin 3 showed reduced sprayability and deterioration of the coating film appearance compared to acrylic-modified alkyd resin 1 and Comparative Example 3 (Examples 6-7). Therefore, it was determined that acrylic-modified alkyd resin 2 and acrylic-modified alkyd resin 3 had inferior aerosol suitability compared to acrylic-modified alkyd resin 1 and Comparative Example 3, and the coating film performance was not confirmed. Furthermore, since the average particle size of Example 6 was 50 nm to 100 nm and the average particle size of Example 7 was 200 nm to 300 nm, it was determined that it is preferable to manufacture the product with an average particle size of 100 nm to 200 nm as one of the conditions for good aerosol suitability.

[0045] Based on the test results in Table 3, when the propellant was 70-90 parts by weight per 100 parts by weight of aerosol paint concentrate, atomization was good and the film thickness was within the target range (approximately 30 μm-40 μm). When the propellant was 110 parts by weight, the target film thickness (approximately 30 μm-40 μm) could not be sufficiently achieved.

[0046] Based on the above, the test results obtained (Tables 2 and 3) show that the aqueous aerosol paint concentrate and the aqueous aerosol paint containing the aqueous aerosol paint concentrate according to the present invention have improved coating film performance while maintaining aerosol suitability compared to the results of Comparative Examples 1 to 3. Specifically, acrylic-modified alkyd resin 1 showed superior aerosol suitability and coating performance compared to Comparative Example 3 in the range of 25 to 35 parts by weight of resin solids and an average particle size of 100 nm to 200 nm. It was shown that it is desirable to use it as an aerosol paint with a propellant content of 70 to 90 parts by weight per 100 parts by weight of aerosol paint concentrate. [Industrial applicability]

[0047] The aqueous aerosol paint concentrate and the aqueous aerosol paint containing the aqueous aerosol paint concentrate according to the present invention are useful for use as household and industrial paints. There are no limitations on the substrate to be painted, but painting on wood is particularly preferred.

Claims

1. A water-based aerosol paint concentrate used in a water-based aerosol paint, wherein the amount of water-based aerosol paint concentrate is 100 parts by weight of water-based aerosol paint raw materials, (a) Dispersion resin, (b) 50 parts by weight or more and 60 parts by weight or less of water, (c) 10 parts by weight or more and 20 parts by weight or less of cosolvent, (d) Pigment of 1 part by weight or less, and (e) Additives Includes, The dispersion resin is an alkyd resin or an acrylic-modified alkyd resin. The dispersion resin contains particles with an average particle size of approximately 100 nm to 200 nm. A water-based aerosol paint concentrate having a resin solid content of 25 parts by weight or more and 35 parts by weight or less.

2. The aqueous aerosol paint concentrate according to claim 1, wherein the dispersion resin is an acrylic-modified alkyd resin.

3. The aqueous aerosol paint concentrate according to claim 1, wherein the co-solvent is butyl cellosolve.

4. The aqueous aerosol paint concentrate according to claim 2, wherein the co-solvent is butyl cellosolve.

5. An aqueous aerosol paint comprising an aqueous aerosol paint concentrate and a propellant according to any one of claims 1 to 4, wherein the propellant is contained in an amount of 70 parts by weight or more and 90 parts by weight or less per 100 parts by weight of the aqueous aerosol paint concentrate, and the propellant is dimethyl ether.

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