JP5646826B2 - Paint composition - Google Patents

Description

The present invention relates to a thick-film coating composition which is applied to an uneven shape on an outer wall, an inner wall, a roof or the like of a building for the purpose of aesthetics or protection of a frame.

  Conventionally, anionic surfactants (A) and nonionic surfactants are used as thick-film coating compositions that are constructed in a concavo-convex shape for the purpose of aesthetics or protection of the housing on the outer walls, inner walls, roofs, etc. of buildings. (B) is an aqueous resin dispersion for elastic coatings obtained by emulsion polymerization of an ethylenically unsaturated monomer (C) with a polymerization initiator (D) in an aqueous medium, an anionic interface The activator (A) is an activator represented by the following general formula (1), and the HLB value of the nonionic surfactant (B) is 13.5 to 18.5, and One using an aqueous resin dispersion for elastic paints having a Tg of −50 to 0 ° C. (see, for example, Patent Document 1), an alkyl group-containing (meth) acrylic acid alkyl ester having 1 to 12 carbon atoms, and 95 to 30 Parts by weight, 5-70 parts by weight of styrene, unsaturated carboxylic acid 0. 0.5 to 10.0% by weight of a polymerizable anionic surfactant with respect to the total monomer consisting of ˜10.0 parts by weight and an amide group-containing acrylic monomer of 0.5 to 10.0 parts by weight And an emulsion for low-contamination type single-layer elastic paint having a glass transition point of -20 to 30 ° C. obtained by emulsion polymerization using both surfactants, a polymerizable nonionic surfactant (see, for example, Patent Document 2). There is a single-layer elastic paint used.

  Moreover, as a coating composition using a resin foam, (A) re-emulsification type powder resin, (B) resin foam particle, and (C) cement, (A) / (B) solid content volume ratio 100/50 to 100/800, and (A) / (C) is mixed with the powdery composition containing the solid content volume ratio of 100/2 to 100/80 when water is used. Some are dispersed in water (for example, see Patent Document 3). Further, as a coating composition using a hollow resin, a synthetic resin emulsion (as a water-based heat-insulating coating material) is formed in a method for forming a heat-insulating coating film by applying a water-based heat-insulating coating material and then applying a water-based top coating material. I), hollow particles (II), and organic powder (a) composed of a polymer having an average particle size of 0.1 to 100 μm and a glass transition temperature of −60 to 60 ° C., and / or an average particle size of 0 Organic powder (III) composed of organic powder (b) having a core portion made of a polymer having a glass transition temperature of less than 30 ° C. and a shell portion made of a polymer having a glass transition temperature of 30 ° C. or higher. Is used as an essential component, and (I) component containing 0.5 to 200 parts by weight of component (II) and 3 to 400 parts by weight of component (III) with respect to 100 parts by weight of solid content is used ( For example, see Patent Document 4.)

However, the coating film formed by these coating compositions is excellent in durability against being stretched in a direction parallel to the substrate surface in a state where it is applied to the substrate. If pressure is applied in a direction perpendicular to the material surface, it may be deformed.
In addition, when a coating film is formed by imparting unevenness with a coating composition in which hollow resin particles are mixed, the coating film cannot hold the hollow resin particles particularly when it is deformed by an external force at the convex portion. There was a problem of fear.

JP 2008-201915 A (pages 2 to 3) JP 10-46099 A (pages 2 to 3) JP-A-11-228863 (pages 2 and 3) JP 2006-102670 A (pages 2 to 3)

  The problem to be solved is a coating composition that forms a coating film by imparting a concavo-convex difference of 0.1 to 1.5 mm, the coating composition comprising a synthetic resin and a hollow resin particle as a binder. When it contains, it is a point that it is easy to take a hollow resin particle from a coating film, when it receives a deformation | transformation by external force.

The invention according to claim 1 is a coating composition for forming a coating film by imparting an unevenness difference of 0.1 to 1.5 mm, wherein the coating composition is a synthetic resin and a hollow resin particle as a binder. And the hollow resin particles in an unexpanded state are heated in a pressure-bonded state, whereby the hollow resin particles are fused together to form secondary particles , and the secondary particles are accumulated. The main feature is that the 50% particle size is 50 to 200 μm .

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the volume of the hollow resin particles closed in the coating composition is 40 to 90% by volume.

The invention according to claim 3 is the invention according to any one of claims 1 and 2, wherein a coating composition having a specific gravity smaller than water and a relative viscosity of 100 is housed in a container. The most important feature is that an aqueous solution adjusted to have a relative viscosity of 120 to 300 is diffused on the liquid surface of the coating composition.

  According to the first aspect of the present invention, the surface area of the hollow resin particles is relatively large and has an undulating surface shape, so that it has an advantage that it is difficult to remove from the coating film when it is deformed by an external force. is there.

According to invention of Claim 2, there exists an advantage that the said coating film has a moderate deformation | transformation return rate, and even if a human touches a coating film, it is hard to receive external damages, such as a scratch.

According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, the liquid level of the coating composition is dried during the storage of the coating composition. There is an advantage that this can be suppressed.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Embodiments of the invention will be described below with reference to FIGS. In addition, the viscosity in this invention says the numerical value at the time of measuring a coating composition with a liquid temperature of 23 degreeC with a B-type viscosity meter (rotation speed 60rpm).

As shown in FIG. 1, the coating composition of the present invention is a coating composition that forms a coating film 2 by imparting a concavo-convex difference of 0.1 to 1.5 mm to the surface of a substrate 1. The product contains a synthetic resin as a binder and hollow resin particles 3, and the hollow resin particles 3 are fused together to form secondary particles 4.
The coating film 2 is a thick film, and the average film thickness is preferably 0.2 to 15 mm, more preferably 0.5 to 10 mm, and most preferably 1 to 8 mm. When the coating film 2 is too thin, when the coating film 2 is formed on the base material 1, the unevenness of the base material 1 itself is easily visible from the surface of the coating film 2, and the unevenness of the base material 1 may be noticeable. Conversely, if the coating film 2 is too thick, coating film defects such as wrinkles and cracks are likely to occur in the coating film 2 in the process of drying the coating composition to form the coating film 2. If the coating film 2 is too thick, there is a case where the return rate after deformation is not sufficient due to large deformation when receiving an external force. In addition, the said average film thickness is the value which measured the film thickness in arbitrary 50 points | pieces of the coating film 2, and averaged those measured values.

Examples of the composition of the coating composition of the present invention are as follows, for example.
Composition example: 20 parts by mass of water as a diluent, 100 parts by mass of a synthetic resin emulsion (acrylic resin, concentration 50%) as a binder, hollow resin particles 10 of methyl methacrylate-acrylonitrile copolymer resin as hollow resin particles 3 10 parts by mass of titanium dioxide as a filler, 100 parts by mass of calcium carbonate as a filler, and 1 part by mass of a thickener.

The unevenness difference is a numerical value obtained by subtracting the thin film thickness from the thick film thickness on the surface of the paint film 2, and in the present invention, an arbitrary mountain in an arbitrary coating area of 5 cm × 5 cm. The difference of the average value which measured the thickness of 10 points of the coating film of a part and the average value which measured the thickness of the coating point of arbitrary troughs 10 points is said.
The unevenness difference needs to be 0.1 to 1.5 mm, more preferably 0.2 to 1.0 mm, and most preferably 0.3 to 0.8 mm. When the unevenness difference is less than 0.1 mm, the surface of the coating film 2 becomes almost smooth. Therefore, when the coating film 2 is formed on the substrate 1, the unevenness of the substrate 1 itself is visually recognized from the surface of the coating film 2. It becomes easy and the unevenness | corrugation of the base material 1 may be conspicuous. On the contrary, when the unevenness difference exceeds 1.5 mm, the deformation amount of the coating film 2 on the convex portion is increased when receiving an external force, so that the convex portion is cracked and the hollow resin particles may be removed. There is.

The concavo-convex shape can be formed by a normal painting tool such as a porous roller, a comb eye, a lysine gun, and a free gun. Moreover, if there is an unevenness difference, it may be smooth or angular.

The substrate 1 can be arbitrarily set. Examples thereof include metals such as iron, aluminum, stainless steel and copper, mortar, concrete, cement materials such as extruded plates, glass, wood, paper and cloth.

The synthetic resin as the binder can be arbitrarily set as long as it is used for ordinary paints. For example, vinyl resins such as vinyl acetate, ethylene vinyl acetate, vinyl propionate, vinyl versatate, methyl (meth) acrylate resin, ethyl (meth) acrylate resin, methyl (meth) acrylate resin, (meth) acrylic Acid resin, acrylic acid butyl resin, methacrylic acid 2-ethylhexyl resin, acrylonitrile resin, acrylic resin such as methacrylonitrile resin, polyester resin, fluorine resin, epoxy resin, polyurethane resin, polyether resin, A vinyl acetate resin, a silicone resin, etc. are mentioned. These may be used singly or in combination of two or more. Moreover, you may use with the form of an emulsion or water-soluble resin. Further, two or more monomers forming these synthetic resins may be copolymerized and used.

The hollow resin particle 3 can be arbitrarily selected as long as it is a hollow body having a synthetic resin shell. Examples of the synthetic resin used as the shell include thermoplastic synthetic resins such as acrylic resin, vinyl chloride resin, and vinyl acetate resin, and thermosetting synthetic resins such as epoxy resin. Among these, it is preferable to use one using a thermoplastic synthetic resin. By using a thermoplastic synthetic resin, hollow resin particles can be easily obtained by heating and foaming thermoplastic synthetic resin particles encapsulating hydrocarbons or the like at a predetermined temperature.

  The hydrocarbon for foaming the hollow resin particles can be arbitrarily set. Examples include methane, ethane, propane, butane, pentane, hexane, heptane, octane and the like. These may be used singly or in combination of two or more. Of the volatile gases, it is preferable to use butane, propane, or pentane. By using butane, propane, or pentane, foaming can be performed at 80 to 200 ° C., so that the heating temperature can be lowered.

The softening temperature of the thermoplastic synthetic resin used for the hollow resin particles is preferably close to the vaporization temperature of the encapsulated hydrocarbon. Since the softening temperature of the thermoplastic synthetic resin is close to the vaporization temperature of the encapsulated hydrocarbon, it can be efficiently foamed.
The difference between the softening temperature of the thermoplastic synthetic resin and the vaporization temperature of the encapsulated hydrocarbon is preferably 50 ° C. or less, more preferably 30 ° C. or less, and most preferably 20 ° C. or less. When it exists in this range, it can be made to foam more efficiently.

  Examples of the thermoplastic synthetic resin include acrylic resins such as methyl methacrylate resin, butyl acrylate resin and acrylonitrile resin, chlorinated resins such as vinyl chloride resin and vinylidene chloride resin, and vinyl acetate resin. These may be used singly or in combination of two or more. Moreover, you may copolymerize and use the monomer which forms these synthetic resins. Among these, it is preferable to use a methyl methacrylate resin, an acrylonitrile resin, a methacrylotolyl resin, a vinyl chloride resin, a vinylidene chloride resin, or a copolymer resin thereof. By using a methyl methacrylate resin, an acrylonitrile resin, a methacrylotolyl resin, a vinyl chloride resin, a vinylidene chloride resin, or a copolymer resin thereof, hollow resin particles 3 excellent in weather resistance, solvent resistance, or flame retardancy are obtained. In addition, it is excellent in the barrier property of the encapsulated hydrocarbon gas.

The particle size (hereinafter referred to as “cumulative 50% particle size”) of 50% of the volume particle size distribution of the hollow resin particles 3 is preferably 10 to 80 μm, more preferably 15 to 60 μm, and most preferably 30 to 50 μm. It is. When in this range, the fine smoothness of the coating film 2 can be ensured, and an appropriate deformation recovery rate when the coating film 2 is subjected to pressure in a direction perpendicular to the surface of the substrate 1 is imparted. Can do. When the cumulative 50% particle diameter of the hollow resin particles 3 is less than 10 μm, the specific surface area is too large and the amount that can be used in the coating composition decreases, and the pressure in the direction perpendicular to the surface of the substrate 1 is reduced. It is not sufficient to give an appropriate deformation recovery rate when received. On the other hand, when the thickness exceeds 80 μm, the fine smoothness of the coating film 2 is impaired, and thus contamination easily occurs.
Note that the fine smoothness of the coating film 2 is not the smoothness of the uneven design in an area of several cm square as in the measurement of the unevenness difference, but the fineness of several tens to several hundreds μm square on the surface of the coating film 2. Smoothness in a large area.
Further, the deformation recovery rate means that when the coating film 2 is compressed from an unweighted state to a state where the film thickness is 80% of the unweighted film thickness and the pressure is released immediately, the unweighted state A numerical value (% = film thickness when the pressure is released immediately after compression to a film thickness of 80% / film thickness under no load × 100). .

  The cumulative 50% particle size can be generally measured using a laser diffraction particle size distribution analyzer.

  It is necessary that the hollow resin particles 3 are fused to form secondary particles 4. As shown in FIGS. 3A to 3D, each of the hollow resin particles 3 is fused to form the secondary particles 4, thereby increasing the apparent specific surface area of the secondary particles 4. Since the contact area with the synthetic resin as the binder of the coating composition is increased, the coating film 2 is formed even when the convex portion is deformed by an external force when the coating film 2 is formed in an uneven shape. A hollow body can be held.

  The fusion of the hollow resin particles 3 can be obtained by heating the unexpanded resin particles in a pressure-bonded state. The pressure applied to the unexpanded resin particles for fusing the hollow resin particles 3 is preferably 86 to 200 kPa, more preferably 91 to 150 kPa, and most preferably 95 to 120 kPa. When in this range, the hollow resin particles 3 can be appropriately fused together. When the pressure applied to the unexpanded resin particles is less than 86 kPa, fusion between the hollow resin particles 3 is not sufficient. Conversely, when it exceeds 200 kPa, the pressure is too high and the hollow resin particles 3 may not be sufficiently foamed.

  The hollow resin particles 3 are preferably fused in water vapor or warm water at 80 ° C. or higher. The hollow resin particles 3 are fused in water vapor or warm water, so that the hollow resin particles 3 are appropriately fused in units of several to several tens of units without excessive fusion of the hollow resin particles 3 in a lump. Can be made.

  The proportion of the secondary particles 4 in the entire hollow resin particle 3 is preferably 5 to 40% by volume, more preferably 10 to 30% by volume, and most preferably 15 to 25% by volume. When it exists in this range, it is excellent in the fine smoothness of the coating film 2, and the retention property of the hollow resin particle 3 by the coating film 2 of a convex part. When the ratio of the secondary particles 4 to the entire hollow resin particles 3 is less than 5%, when the coating film 2 is formed in a concavo-convex shape, the hollow resin particles 3 formed by the coating film 2 particularly in the convex portions. Since the holding is not sufficient, the hollow resin particle 3 may fall off the coating film 2 when it is deformed by an external force. In that case, since a dent arises in the part from which the hollow resin particle 3 of the coating film 2 was removed, the contamination resistance of the coating film 2 is reduced because the contaminants easily collect in the dent. On the other hand, if it exceeds 40% by volume, the fine smoothness of the coating film 2 is impaired, so that contaminants are likely to adhere.

  The cumulative 50% particle diameter of the secondary particles 4 is preferably 50 to 200 μm, more preferably 60 to 150 μm, and most preferably 70 to 120 μm. When it exists in this range, it is excellent in the fine smoothness of the coating film 2, and the retention property of the hollow resin particle 3 by the coating film 2 of a convex part. When the cumulative 50% particle diameter of the secondary particles 4 is less than 50 μm, the hollow resin particles 3 are not sufficiently retained by the coating film 2 particularly at the convex portions when the coating film 2 is formed in an uneven shape. For this reason, the hollow resin particle 3 may fall off the coating film 2 when it is deformed by an external force. In that case, since a dent arises in the part from which the hollow resin particle 3 of the coating film 2 was removed, the contamination resistance of the coating film 2 is reduced because the contaminants easily collect in the dent. On the other hand, when it exceeds 200 μm, the fine smoothness of the coating film 2 is impaired, so that contaminants are likely to adhere.

  The volume of the hollow resin particles 3 closed in the coating composition is preferably 40 to 90% by volume, more preferably 50 to 80% by volume, and most preferably 55 to 75% by volume. When it is within this range, the coating film 2 formed by the coating composition can be imparted with an appropriate deformation recovery property, and even when a person touches the coating film 2, it is difficult to damage the skin of the person who touched it. When the volume of the hollow resin particles 3 closed in the coating composition is less than 40% by volume, the coating film 2 is not sufficiently deformable and may damage the skin, and the design may be maintained by breaking the uneven shape. It may not be possible. On the other hand, when it exceeds 90% by volume, the synthetic resin as the binder is relatively decreased, and thus the retention of the hollow resin particles 3 by the coating film 2 is lowered.

The deformation recovery rate of the coating film 2 is preferably 85% or more, more preferably 90% or more, and most preferably 95% or more. When it exists in this range, even if a person touches the coating film 2, there is little possibility of damaging skin. When the deformation recovery rate of the coating film 2 is less than 85%, the skin may be damaged when it touches the coating film 2.

  The filler can be arbitrarily set as long as it is used for ordinary paints. For example, titanium dioxide, zinc oxide, calcium carbonate, clay, mica, silica sand and the like can be mentioned. Of these, titanium dioxide and calcium carbonate are preferably used in combination. By using titanium dioxide and calcium carbonate in combination, the distance of the titanium dioxide particles can be kept appropriate. Therefore, when visible light is irradiated onto the titanium dioxide particles, the interference between the secondary light emitted when the excited electrons return to the ground state and the secondary light of the adjacent titanium dioxide particles is reduced. Therefore, the desired whiteness of the coating film 2 can be obtained with a small amount of titanium dioxide used.

  Preferably the calcium carbonate mass with respect to 10 mass parts of said titanium dioxide is 30-250 mass parts, More preferably, it is 40-180 mass parts, Most preferably, it is 50-120 mass parts. When in this range, the distance of the titanium dioxide particles can be kept appropriate. Therefore, when visible light is irradiated onto the titanium dioxide particles, the interference between the secondary light emitted when the excited electrons return to the ground state and the secondary light of the adjacent titanium dioxide particles is reduced. Therefore, the desired whiteness of the coating film 2 can be obtained with a small amount of titanium dioxide used.

The viscosity of the coating composition is preferably 50 to 350 dPa · s, more preferably 100 to 300 dPa · s, and most preferably 120 to 250 dPa · s. When it exists in this range, it becomes easy to provide uneven | corrugated shape to the coating film 2 formed with a coating composition. When the viscosity of the coating composition is less than 50 dPa · s, the viscosity is too low to make it difficult to give the uneven shape. On the other hand, when it exceeds 350 dPa · s, the viscosity is too high and the painting operation becomes difficult.

  The coating composition is not limited to a thickening agent, and a normal coating additive may be used as necessary as long as the effects of the present invention are not impaired. For example, thickeners, dispersants, antifoaming agents, film-forming aids, wetting agents, antifreeze agents, colored pigments, extender pigments, cross-linking agents, metal films, UV absorbers, antioxidants, leveling agents, silane cups A ring agent, a fiber, an antiseptic, a fungicide, an algae, a pH adjuster, etc. are mentioned.

The coating composition constituted as described above is used as follows.
As shown in FIG. 4, 16 liters of the coating composition of the present invention adjusted to a specific gravity of 0.98 and a viscosity of 200 dPa · s is accommodated in a metal square can 5 having a volume of 18 liters as a container. On the liquid surface of the coating composition, 100 parts by mass of an aqueous solution adjusted to have a specific gravity of 1.1 and a viscosity of 350 dPa · s are diffused thinly over the entire liquid surface of the coating composition to form an aqueous solution layer 7.

The composition of the aqueous solution is, for example, as follows.
Composition example of aqueous solution: 100 parts by mass of water, 3 parts by mass of hydroxyethyl cellulose as a thickener, and 0.1 parts by mass of preservative.

When the viscosity of the coating composition is 100, the viscosity of the aqueous solution is preferably 120 to 300, more preferably 130 to 250, and most preferably 150 to 220. When in this range, even when the specific gravity of the aqueous solution is larger than that of the coating composition, it is possible to suppress the aqueous solution from being settled in the coating composition due to vibration caused by movement or transportation. It can suppress that a composition dries during accommodation and forms a membrane | film | coat. If the viscosity of the aqueous solution is less than 120 when the viscosity of the coating composition is 100, the aqueous solution settles in the coating composition due to vibration caused by movement or transportation, and the liquid level of the coating composition is dried. May form a film. Conversely, when the viscosity of the aqueous solution exceeds 300 when the viscosity of the coating composition is 100, the viscosity of the coating composition increases by mixing and stirring the aqueous solution and the coating composition during construction. This may make the painting operation difficult.

  The storage container can be arbitrarily set as long as it is a container for storing a normal paint. For example, a metal, a plastic, etc. are mentioned. Further, the shape of the storage container is not limited to a square, and can be arbitrarily set. For example, a cylindrical shape, an elliptical cylinder shape, a polyhedron, etc. are mentioned.

  The aqueous solution layer 7 is preferably spread thinly over the entire liquid surface of the coating composition in a state of being accommodated in a storage container. In a state where the aqueous solution layer 7 is accommodated in the storage container, it spreads thinly over the entire liquid surface of the coating composition, thereby suppressing moisture evaporation from the liquid surface of the coating composition and being stored in the storage container. The film formation of the coating composition can be suppressed.

  The specific gravity of the aqueous solution is preferably 1.5 or less, more preferably 1.2 or less, and most preferably 1.1 or less. When in this range, even if vibration due to movement or transportation is applied, it can be diffused to the liquid surface of the coating composition contained in the container.

  The thickener can be arbitrarily set as long as it is used for ordinary paints. Examples thereof include celluloses such as carboxymethyl cellulose and hydroxyethyl cellulose, associative urethane resins, and polyvinyl alcohol. Of these, it is preferable to use the same thickener as that used in the coating composition. By using the same thickener as that used in the coating composition, the viscosity characteristics of the coating composition can be kept the same even when the aqueous solution and the coating composition are mixed and stirred during construction.

  In addition, the aqueous solution is not limited to a thickener, and a normal additive for paint can be used as needed as long as the effects of the present invention are not impaired. For example, thickeners, dispersants, antifoaming agents, film-forming aids, wetting agents, antifreeze agents, colored pigments, extender pigments, cross-linking agents, metal films, UV absorbers, antioxidants, leveling agents, silane cups A ring agent, a fiber, an antiseptic, a fungicide, an algae control agent, a pH adjuster, etc. are mentioned.

  The coating composition taken out from the container is applied with a concavo-convex shape on the wall surface of the building by a porous roller as a construction tool. When several hours have elapsed after the application, the coating composition applied to the wall surface is dried to form a coating film 2 having a deformation recovery rate of 92% with an uneven pattern.

  When a person touches the coating film 2 provided with the uneven pattern, the coating film 2 is deformed and absorbs pressure, and does not damage the skin of the person touching the hollow resin particles 3 in the coating film 2. Are held in the coating film 2 because they are fused to each other.

  The object to which the coating composition is applied is not limited to the wall surface of the building, and can be set arbitrarily. Examples include building materials such as inner and outer walls, roofs, floors, ceilings and doors, manufacturing equipment such as injection molding machines and vending machines, automobiles, refrigerators and air conditioners.

  This embodiment can exhibit the following effects.

The fine 50% particle diameter of the hollow resin particles 3 is 10 to 80 μm, so that the fine smoothness of the coating film 2 can be ensured and the elasticity in the direction perpendicular to the surface of the substrate 1 can be secured. 2 can be given.

Each of the hollow resin particles 3 is fused to form the secondary particles 4, thereby increasing the apparent specific surface area of the secondary particles 4, and a synthetic resin as a binder for the coating composition Therefore, when the coating film 2 is formed in a concavo-convex shape, the coating film 2 can hold the hollow body even when the convex portion is deformed by an external force.

-By the ratio of the secondary particle 4 to the whole said hollow resin particle 3 being 5 to 40 volume%, it is excellent in the fine smoothness of the coating film 2, and the retention property of the hollow resin particle 3 by the coating film 2 of a convex part. .

-Since the deformation return rate of the coating film 2 is 85% or more, there is little risk of damaging the skin even if a person touches the coating film 2.

When the viscosity of the aqueous solution is 120 to 300 when the viscosity of the coating composition is 100, even if the specific gravity of the aqueous solution is larger than that of the coating composition, the aqueous solution is vibrated by vibration due to movement or transportation. Can be prevented from settling in the coating composition, and the coating composition can be prevented from drying and forming a film during storage.

  In addition, the said embodiment of this invention can also be changed and comprised as follows.

-In the said embodiment, although the coating film 2 was formed by normal temperature drying, you may heat-dry.

In the above embodiment, only the coating composition of the present invention is applied, but the coating composition may be applied after applying the undercoat, or the topcoat may be applied after applying the coating composition. .
When comprised in this way, the function by undercoating can be given, for example, the adhesiveness is improved even for the base material 1 that is difficult to adhere, and when the water absorption of the base material 1 is large, the water absorption is suppressed. Etc. can be obtained. In addition, when a top coat is applied, weather resistance, water resistance, stain resistance, colorability and the like can be improved.

Next, technical ideas other than the invention described in the claims ascertained from the embodiment will be described together with their effects.
(1) The coating composition according to claim 1 or 2, wherein the deformation recovery rate of the coating film 2 formed from the coating composition is 70% or more.
When comprised in this way, even if a person touches the coating film 2, there is little possibility of damaging skin.
(2) The coating composition according to claim 1 or 2, wherein a ratio of the secondary particles 4 to the entire hollow resin particles is 5 to 40% by volume.
When configured in this manner, contaminants are less likely to adhere.

Hereinafter, examples and comparative examples embodying the embodiment will be described.
In the test, the coating composition was applied to a flexible plate having a width of 75 mm, a length of 150 mm, and a thickness of 4 mm with a porous roller at a coating amount of 200 g / m 2 and dried in a constant temperature room at 23 ° C. and 65 RH% for 2 weeks. The body. First, the coating 2 side surface of the test body was placed on the arm and moved back and forth lightly to confirm the degree of skin damage. Subsequently, the test body was allowed to stand on a horizontal surface, and a flexible plate having a width of 75 mm, a length of 150 mm, and a thickness of 4 mm was placed on the surface of the coating film 2 and applied for 3 seconds in the horizontal length direction of the test body. The holding state of the hollow resin on the surface of the coating film 2 was observed with a shift of 75 mm. Thereafter, the specimen was fixed outdoors at an angle of 30 degrees toward the south surface, and the contamination state of the coating film 2 after 3 months was observed. Then, the test body was cut | disconnected in the longitudinal direction and the uneven | corrugated difference of the coating-film surface was measured.

Example 1
The composition of the coating composition used in the test of Example 1 was 20 parts by mass of water as a diluent, 100 parts by mass of a synthetic resin emulsion (acrylic resin, concentration 50%) as a binder, and methacryl as a hollow resin particle 3. 10 parts by mass of acid methyl-acrylonitrile copolymer resin hollow resin particles, 10 parts by mass of titanium dioxide as a filler, 100 parts by mass of calcium carbonate as a filler, and 1 part by mass of a thickener. The hollow resin particles 3 used in this test contained 8% by volume of secondary particles 4.
As a result of the test, the skin was not damaged, the holding state of the hollow resin was good, and the contamination state was also good. The unevenness difference of the coating film was 0.3 mm.

(Example 2)
The composition of the coating composition used in the test of Example 2 was 20 parts by mass of water as a diluent, 100 parts by mass of a synthetic resin emulsion (acrylic resin, concentration 50%) as a binder, and methacrylic as hollow resin particles 3. 10 parts by mass of acid methyl-acrylonitrile copolymer resin hollow resin particles, 10 parts by mass of titanium dioxide as a filler, 100 parts by mass of calcium carbonate as a filler, and 1 part by mass of a thickener. The hollow resin particles 3 used in this test contained 28% by volume of secondary particles 4.
As a result of the test, the skin was not damaged, the holding state of the hollow resin was good, and the contamination state was also good. The unevenness difference of the coating film was 0.2 mm.

Example 3
The composition of the coating composition used in the test of Example 3 is 20 parts by mass of water as a diluent, 100 parts by mass of a synthetic resin emulsion (acrylic-styrene copolymer resin, concentration 55%) as a binder, and hollow resin particles. 3, 10 parts by mass of methyl methacrylate-acrylonitrile copolymer resin hollow resin particles 3, 10 parts by mass of titanium dioxide as a filler, 100 parts by mass of calcium carbonate as a filler, and 1 part by mass of a thickener. The hollow resin particles 3 used in this test contained 10% by volume of secondary particles 4.
As a result of the test, the skin was not damaged, the holding state of the hollow resin was good, and the contamination state was also good. The unevenness difference of the coating film was 0.3 mm.

Example 4
The composition of the coating composition used in the test of Example 4 is 20 parts by weight of water as a diluent, 100 parts by weight of a synthetic resin emulsion (acryl-silicone copolymer resin, concentration 47%) as a binder, hollow resin particles 10 parts by mass of vinylidene chloride-acrylonitrile copolymer resin hollow resin particles 3, 10 parts by mass of titanium dioxide as a filler, 60 parts by mass of calcium carbonate as a filler, and 1 part by mass of a thickener. The hollow resin particles 3 used in this test contained 19 vol% of secondary particles 4.
As a result of the test, the skin was not damaged, the holding state of the hollow resin was good, and the contamination state was also good. The unevenness difference of the coating film was 0.4 mm.

(Example 5)
The composition of the coating composition used in the test of Example 5 was composed of 20 parts by mass of water as a diluent, 100 parts by mass of a synthetic resin emulsion (acryl-silicone copolymer resin, concentration 47%) as a binder, and hollow resin particles. 10 parts by mass of vinylidene chloride-acrylonitrile copolymer resin hollow resin particles 3, 10 parts by mass of titanium dioxide as a filler, 60 parts by mass of calcium carbonate as a filler, and 1 part by mass of a thickener. The hollow resin particles 3 used in this test contained 33% by volume of secondary particles 4.
As a result of the test, the skin was not damaged, the holding state of the hollow resin was good, and the contamination state was also good. The unevenness difference of the coating film was 0.5 mm.

(Example 6)
The composition of the coating composition used in the test of Example 6 was 20 parts by mass of water as a diluent, 100 parts by mass of a synthetic resin emulsion (acrylic resin, concentration 50%) as a binder, and methacryl as a hollow resin particle 3. 10 parts by mass of acid methyl-acrylonitrile copolymer resin hollow resin particles, 10 parts by mass of titanium dioxide as a filler, 100 parts by mass of calcium carbonate as a filler, and 1 part by mass of a thickener. The hollow resin particles 3 used in this test contained 58% by volume of secondary particles 4.
As a result of the test, the skin was not damaged, the holding state of the hollow resin was good, and the coating film was slightly contaminated. The unevenness difference of the coating film was 0.3 mm.

(Example 7)
The composition of the coating composition used in the test of Example 7 was 20 parts by mass of water as a diluent, 100 parts by mass of a synthetic resin emulsion (acrylic resin, concentration 50%) as a binder, and methacryl as a hollow resin particle 3. 10 parts by mass of acid methyl-acrylonitrile copolymer resin hollow resin particles, 10 parts by mass of titanium dioxide as a filler, 100 parts by mass of calcium carbonate as a filler, and 1 part by mass of a thickener. The hollow resin particles 3 used in this test contained 2% by volume of secondary particles 4.
As a result of the test, the skin was not damaged, the holding state of the hollow resin was good, and the coating film was slightly contaminated. The unevenness difference of the coating film was 0.6 mm.

(Example 8)
The composition of the coating composition used in the test of Example 8 is 20 parts by mass of water as a diluent, 100 parts by mass of a synthetic resin emulsion (acrylic resin, concentration 50%) as a binder, and methacryl as a hollow resin particle 3. 30 parts by mass of acid resin-acrylonitrile copolymer resin hollow resin particles, 10 parts by mass of titanium dioxide as a filler, 100 parts by mass of calcium carbonate as a filler, and 1 part by mass of a thickener. The hollow resin particles 3 used in this test contained 22% by volume of secondary particles 4.
As a result of the test, the skin was not damaged, the holding state of the hollow resin was good, and the contamination state was also good. The unevenness difference of the coating film was 1.3 mm.

(Comparative Example 1)
The composition of the coating composition used in the test of Comparative Example 1 was 20 parts by mass of water as a diluent, 100 parts by mass of a synthetic resin emulsion (acrylic resin, concentration 50%) as a binder, and methacrylic as hollow resin particles 3. 10 parts by mass of acid methyl-acrylonitrile copolymer resin hollow resin particles, 10 parts by mass of titanium dioxide as a filler, 100 parts by mass of calcium carbonate as a filler, and 1 part by mass of a thickener. The hollow resin particles 3 used in this test did not contain the secondary particles 4.
As a result of the test, the skin was not damaged, but the retained state of the hollow resin was partially removed, and contamination of the coating film was observed. The unevenness difference of the coating film was 0.3 mm.

(Comparative Example 2)
The composition of the coating composition used in the test of Comparative Example 2 was 20 parts by mass of water as a diluent, 100 parts by mass of a synthetic resin emulsion (acrylic resin, concentration 50%) as a binder, and titanium dioxide 10 as a filler. It is 100 parts by mass of calcium carbonate as a filler, 1 part by mass of a thickener.
As a result of the test, the skin was damaged and the contamination was good. The unevenness difference of the coating film was 0.5 mm.

It is a schematic cross section which shows the coating film formed with the coating composition of this invention. (A), (b) It is a schematic cross section which shows another example of the coating film formed with the coating composition of this invention. It is the model perspective view which showed the state of the secondary particle of (a)-(d) hollow resin particle. It is the schematic cross section which showed the accommodation state of the coating composition of this invention.

DESCRIPTION OF SYMBOLS 1 Base material 2 Coating film 3 Hollow resin particle 4 Secondary particle 5 Metal square can as a container 6 Coating composition 7 Aqueous solution layer

Claims (3)

A coating composition for forming a coating film by imparting an unevenness difference of 0.1 to 1.5 mm, wherein the coating composition contains a synthetic resin as a binder and hollow resin particles, and is not expanded By heating the hollow resin particles in a state of being pressed together , the hollow resin particles are fused together to form secondary particles , and the cumulative 50% particle diameter of the secondary particles is 50 to 200 μm. coating composition characterized in that there is. 2. The coating composition according to claim 1, wherein the volume of the hollow resin particles closed in the coating composition is 40 to 90% by volume. A coating composition having a specific gravity less than water and a relative viscosity of 100 is contained in a container, and an aqueous solution adjusted to a relative viscosity of 120 to 300 is diffused to the liquid surface of the coating composition on the liquid surface of the coating composition. The method for containing a coating composition according to claim 1, wherein the coating composition is contained.

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