JP2022066754A - Stone-like coating material, and mounting material using the same - Google Patents

Abstract

To provide a stone-like coating material which brings stabilization in the color of a formed coating film such as reduction of color variation of the coating film caused by variation of a colored aggregate, and color variation of the coating film caused by a drying condition of the coating film, reduces discoloration and fading for a long period owing to coloring of the coating film by a plurality of coloring components of a colored aggregate and pigment components, and moderates the change even when there is discoloration.SOLUTION: A stone-like coating material is obtained by mixing a synthetic resin capable of forming a transparent film after cure-drying with a colored aggregate having a particle diameter of 37-2,000 μm. When the stone-like coating material is added with pigment components and adjusted, a color difference ΔE between a color of a coating film before adjustment and a color of the coating film after adjustment is 10 or less. With this, the color of the formed coating film is stabilized, discoloration and fading for a long period is reduced owing to coloring of the coating film by a plurality of coloring components of a colored aggregate and pigment components, and the change is moderated even when there is discoloration.SELECTED DRAWING: None

Description

The present disclosure relates to a stone-like paint used for finishing the inner and outer walls of a structure such as a building and a sheet-like surface covering material using the same, and its application field is the construction field.

Conventionally, a stone-like paint composed of a synthetic resin and a colored aggregate is often used because of the texture such as the versatility of the coating film obtained by the stone-like paint. Further, one kind or two or more kinds of this stone-like paint may be used to obtain a coating film expressing a texture similar to stone such as granite, marble or sandstone.
As described above, the stone-like paint may be preferably used to obtain a high-quality coating film.

Japanese Patent Application Laid-Open No. 2004-99911 describes a paint containing a colored aggregate.
In this description, a hindered amine light stabilizer is added to a stone-like paint such as a colored aggregate-containing coating material containing a colored aggregate and a synthetic resin as a main component, and a colored aggregate-containing coating material, and the weather resistance is easily excellent. It is a stone-like paint that can form a coating film.

The method for forming a coating film described in JP-A-06-206040 uses a coating composition containing a heat-sensitive gelling agent in a synthetic resin emulsion, and the filler is contained in the coating composition. It contains colored aggregates such as calcium carbonate, talc, clay, cold water sand, and aggregates.
As a result, the thick coating film can be efficiently dried in a short period of time to provide various finished states.

Japanese Unexamined Patent Publication No. 2004-09911 Japanese Unexamined Patent Publication No. 06-206040

However, with the colored aggregate-containing coating material described in JP-A-2004-099911, it is possible to easily obtain a colored aggregate-containing coating material that forms a coating film having excellent weather resistance, but the color of the coating film is It does not affect stability.
That is, the coating film formed by such a stone-like paint is often affected by the color of the colored aggregate, and the color is slightly different depending on the lot of the colored aggregate, and even if the coating film is formed. The colors may feel different.

Further, the color of the coating film may be affected by the drying conditions of the coating film, and if the drying is fast, fine bubbles may remain in the coating film and the coating film as a whole may become whitish. Therefore, even if the same surface is painted, the colors may look different depending on the painting time.
Further, in the coating composition described in JP-A-06-206040, the thick coating film is efficiently dried in a short period of time to obtain various finished states, but it is similar to a stone-like paint. In some cases, as described above, fine bubbles remain in the coating film, the coating film as a whole becomes whitish, and it may be difficult to obtain a desired color.

The stone-like paint of the present disclosure stabilizes the color of the formed coating film by reducing the color blurring of the coating film due to the variation of the colored aggregate and the color blurring of the coating film due to the drying conditions of the coating film. It is an object of the present invention to provide a stone-like paint in which the coloration of a coating film by a plurality of coloring components of a material and a pigment component causes less discoloration and fading for a long period of time, and even if there is discoloration, the change is gradual.

A stone-like paint in which a synthetic resin capable of forming a transparent film after being cured and dried and a colored aggregate having a particle size in the range of 37 to 2000 μm are mixed, and a pigment component is added to the stone-like paint. The color difference between the color of the coating film before adjustment and the color of the coating film after adjustment is 10 or less in ΔE.
As a result, the color of the formed coating film is stabilized by reducing the color blurring of the coating film due to the variation of the colored aggregate and the color blurring of the coating film due to the drying conditions of the coating film. Due to the coloring of the coating film by the plurality of coloring components, there is little discoloration and fading for a long period of time, and even if there is discoloration, the change is gradual.

The synthetic resin is an aqueous synthetic resin emulsion with a heat-sensitive gelling agent added, which efficiently dries the thick coating film while reducing the color blurring of the coating film due to the variation of the colored aggregate, and the drying conditions of the coating film. The color of the formed coating film is stabilized by reducing the color blurring of the coating film due to the above.

Since the surface material is obtained by applying the stone-like paint disclosed in the present application to the surface of the base material, the variation in the colored aggregate and the color blurring of the coating film due to the drying conditions of the coating film are reduced, and the timing of coating is adjusted. Even if they are different, the color of the coating film is stable with little color blurring, and there is little discoloration and fading over a long period of time due to the coloring of the coating film by multiple coloring components of the colored aggregate and the pigment component, and there is discoloration. Even if this is the case, it is possible to obtain a surface material whose change is gradual.

An embodiment of the present disclosure will be described.
The present disclosure is a stone-like paint in which a synthetic resin capable of forming a transparent film after being cured and dried and a colored aggregate having a particle size in the range of 37 to 2000 μm are mixed, and the stone-like paint is dyed. It is a stone-like paint having a color difference of ΔE between the color of the coating film before adjustment and the color of the coating film after adjustment of 10 or less by adding and adjusting the components.

First, the synthetic resins capable of forming a transparent film after being cured and dried are acrylic resin, styrene resin, urethane resin, silicone resin, fluororesin, epoxy resin, melamine resin, alkyd resin, vinyl chloride resin, and vinyl acetate. Examples thereof include resins such as resins and polyester resins, which are used alone or in combination with each other.
Further, those obtained by dissolving these resins in an organic solvent, those dispersed in water as an emulsion, or those dispersed in a weak solvent can be mentioned.

This synthetic resin forms a transparent film after curing and drying. It is a binder in stone-like paint, and forms a coating film by adhering the surface to be coated and the stone-like paint and bonding colored aggregates to each other. be.
In addition, since the material that forms the transparent film is a binder, the color tone and texture of the colored aggregate are utilized to enhance the design feeling.

Since the synthetic resin emulsion is easily available and has good miscibility with colored aggregate, it is easy to manufacture a stone-like paint, and the viscosity of the obtained stone-like paint can be adjusted with water. Therefore, it is preferably used, and it is easy to use by adding a heat-sensitive gelling agent described later.
This synthetic resin emulsion is a general one that can be produced by a usual polymerization technique such as emulsion polymerization, and there is a synthetic resin emulsion produced from the above-mentioned synthetic resin or the like.

Acrylic synthetic resin emulsions and acrylic styrene synthetic resin emulsions made from acrylic resin and styrene resin are preferably used because of their suitability and physical properties as stone-like paints and their availability.
Further, in order to further improve the weather resistance, a urethane-based synthetic resin emulsion, a silicone-based synthetic resin emulsion, a fluorine-based synthetic resin emulsion, an acrylic silicone-based synthetic resin emulsion, or the like may be used.

The synthetic resin emulsion preferably has good drying properties. If the drying property is inferior, it may flow if it rains after applying a relatively thick stone-like paint, or if the applied material is uncured or undried.
The glass transition temperature of the synthetic resin is preferably in the range of −20 ° C. to 50 ° C., and if it is lower than −20 ° C., the formed coating film may be easily soiled, and if it is higher than 50 ° C., it may be easily soiled. The coating film may be easily cracked, and a synthetic resin having a glass transition temperature suitable for the application can be selected.

The solid content of the synthetic resin is preferably in the range of 5 to 50% by weight in the solid content of the stone-like paint. If it is less than 5% by weight, the weather resistance of the coating film is lowered and it may become brittle. On the other hand, if it is more than 50% by weight, it may be easily soiled.
Surfactants used as defoamers, dispersants, wetting agents, etc., high boiling point solvents used as film-forming aids, antifreeze agents, etc., viscosity thickeners for adjusting viscosity, preservatives, etc. , Various additives generally blended in paints such as algae-proofing agents, antifungal agents, pH adjusters and the like can be added as needed.

In addition, it is preferable to add additives such as hindered amine light stabilizers, ultraviolet absorbers and antioxidants that can improve the weather resistance of the coating film.
In many cases, a stone-like paint is prepared by adding various additives to a synthetic resin emulsion and adjusting the solid content with water as a vehicle component, and adding a colored aggregate and a pigment component described later. Even this vehicle component forms a film when it is dried by itself, and this film is preferably transparent.

Since most of the solid content of such a vehicle component is a resin component, the solid content of the vehicle component is preferably in the range of 20 to 50% by weight. When the solid content is less than 20% by weight, the amount of synthetic resin in the vehicle component is small, the coating film of the stone-like paint is brittle, the adhesion is weak and the coating film may peel off, or the colored aggregate may fall from the coating film. Will increase.
If the solid content is more than 50% by weight, the solid content in the stone-like paint may be high and mixing may be difficult.

Next, the colored aggregate is an aggregate having a color, which is mixed with a vehicle component containing a synthetic resin to form a stone-like paint, and the coating film formed by the stone-like paint has a variety of feelings. It gives a sense of luxury such as, and improves the sense of design.
Examples of the colored aggregate include, from highly transparent aggregate to highly concealing aggregate, and from glossy aggregate to non-glossy aggregate. A completely colorless and transparent aggregate is not a colored aggregate because it has no color. However, it is possible to add an aggregate such as a colorless and transparent crushed glass to the extent that it does not affect the color tone of the stone-like paint.

Colored aggregates used in this stone-like paint include crushed colored natural stones and crushed ceramics and the like. In addition, there are colored aggregates such as those obtained by artificially coloring colored natural stones and crushed ceramics and those produced industrially.
Examples of crushed colored natural stones include granite, serpentinite, obsidian, fluorite, canary, shiratama, cold water, small cherry blossoms, jet snow, Mino haze, crushed marble grains such as serpentinite, silica sand, and natural fine gravel.

Further, lightweight aggregates such as shirasu balloons, pearlite, and foamed crushed glass can be mentioned. In addition to the above components, it is also possible to add components such as aluminum hydroxide, halogen-based, phosphorus-based, antimony trioxide-based compounds and other flame retardants as colored aggregates.
Among these colored aggregates, colored aggregates are preferably used. Many of these colored aggregates are made by coloring aggregates made by crushing cold water stones or silica sand, and the color, grain size, and particle size are more stable than those of crushed natural stones. The color of the coating film formed by the paint can be made more stable. Further, the coating work of the paint is stable, and the paint is also excellent in stability.

In particular, artificially colored silica sand, cold water sand, and crushed ceramic granules are more preferably used because they are easily available and have excellent miscibility with synthetic resins.
Most of the methods for coloring the aggregate are to put the aggregate in a container and spray paint, pigment, glaze, etc. evenly over the entire aggregate while stirring with a mixer etc. to color the aggregate. Many of them are obtained by drying the colored aggregate using hot air or the like while applying vibration using a vibration dryer from a uniformly colored state.

Further, glass beads, plastic beads, etc. are colored from the inside of the aggregate and processed into a substantially spherical shape in the manufacturing process.
The particle size of this colored aggregate is in the range of 37 to 3000 μm, preferably in the range of 45 to 1000 μm. In the case of an aggregate finer than 37 μm, when a pigment component described later is added, the pigment component impairs the colorfulness of the colored aggregate in the coating film, and the stability of the coating material and the workability of the coating work are improved. It may be inferior.

In addition, the formed coating film may be cracked due to shrinkage, or the coating film may lack a sense of versatility due to the colored aggregate and lack designability.
In the case of an aggregate larger than 3000 μm, the finished surface of the coating film is rough and the design is inferior. When decorating such as painting, a part of the colored aggregate often does not adhere to the object to be painted, and the formed coating film is rough and lacks in design.

When a colored aggregate in the range of 45 to 1000 μm was used, the stone-like paint had good stability during storage, the formed coating film became relatively smooth, and the design was more preferably balanced. It is a thing.
In the stone-like paint configured as described above, the ratio of the weight of the synthetic resin solid content in the vehicle component to the weight of the colored aggregate is preferably in the range of 1: 1 to 1:10. When the weight ratio is less than 1: 1 and the amount of aggregate is less than 1: 1, the pigment component and the colored aggregate may be separated during storage, depending on the viscosity of the stone-like paint.

When the amount of aggregate is more than 1:10, the amount of synthetic resin is small and the coating film may become brittle. In addition, the amount of colored aggregate becomes too large, the viscosity of the stone-like paint tends to be high, it is difficult to mix with the colored aggregate, and it may not be possible to obtain a uniformly mixed stone-like paint.
More preferably, the ratio of the weight of the synthetic resin solid content to the weight of the aggregate is in the range of 1: 2 to 1: 5. Within this range, the pigment component and the colored aggregate are less separated during storage, and the coating film does not become brittle.

The pigment component is another component that colors a transparent film made of synthetic resin, and mainly includes coloring pigments and dyes, and there are paints using these, depending on the point of weather resistance and the amount of addition thereof. In many cases, colored pigments are often used.
As the coloring pigment, an inorganic pigment, an organic pigment, or both of them are used. As the coloring pigment, titanium oxide, carbon black, oxide yellow, petal pattern, cyanine blue or cyanine green, which are generally used for coloring paints, can be used, and liquid coloring pigments can be used due to their ease of handling. And dyes are often used. They are preferably those having good weather resistance.

Coloring pigments and dyes often change color greatly depending on the amount added, and it is often difficult to adjust the amount added. Therefore, diluted coloring pigments and dyes may be used.
Further, colored paints and the like can also be used. When a paint is used, it is often difficult to adjust the color with a pigment, such as when the desired color is a light color such as gray or cream.

The paint is not particularly limited and may be mixed with this stone-like paint, and water-based emulsion-based paints such as acrylic resin-based, silicone resin-based, urethane resin-based, and silicon acrylic resin-based paints are preferably used. Therefore, a paint similar to the stone-like paint is preferably used.
By adding this pigment component to the stone-like paint, the viscosity of the stone-like paint may change. In particular, liquid coloring pigments, dyes, paints, and other liquid pigments are often used, and for this reason, viscosity-imparting agents such as thickeners for these liquid pigments may be used.

As the pigment component such as this coloring pigment, a color similar to the color of the colored aggregate is often selected, and if it is a similar color, it is the same as the coating film with the paint before adding the pigment component to the stone-like paint. It becomes easy to make the color difference from the color of the coating film after the addition and adjustment of the dye component 10 or less in ΔE.
When this color difference is greater than 10 in ΔE, the colors of the coating films are felt to be different from each other, and it is felt that the paint has a different color by adding the pigment component to the stone-like paint. Preferably, the ΔE is 5 or less, which is considered to be substantially the same color.

This color difference is the color difference between the coating film formed by the stone-like paint before the addition of the dye component and the coating film after the addition.
In general, the color difference is one of the indexes defined between two colors, and the larger the color difference is, the easier it is to distinguish the colors, and the smaller the color difference is, the more difficult it is to understand the color difference. The color difference is represented by ΔE, and is calculated by ΔE = ((ΔL *) ² + (Δa *) ² + (Δb *) ² ) ^1/2 .

These ΔL *, Δa *, and Δb * are the difference between the CIE1976 brightness L * of the two object colors in the L * a * b * color system and the difference between the color coordinates Δa * and Δb *, respectively.
There are no restrictions on the timing of addition of this pigment component, such as when it is added to a vehicle component or when it is added to a stone-like paint, but by adding it to a vehicle component with low viscosity and solid content, it is relatively short. Can be mixed evenly over time.

In addition, the color, type, and addition amount of the pigment component will be confirmed in advance, and the stone-like paint will be manufactured.
It is preferable that the stone-like paint is an aqueous synthetic resin emulsion to which a heat-sensitive gelling agent is added. This heat-sensitive gelling agent is added to an aqueous synthetic resin emulsion in which synthetic resin particles are uniformly dispersed in a solvent such as water, thereby destabilizing the synthetic resin particles when the temperature reaches a certain temperature or higher, and aggregating the synthetic resin particles. The particles stick to each other to form a film.

That is, the addition of the heat-sensitive gelling agent changes the emulsion from a stable one to an unstable one.
Even if heat drying or the like is performed after forming this film, it is possible to form a uniform coating film with less swelling or cracking of the film during the drying process. The swelling and cracking of the film in the drying process are caused by the difference in drying between the surface layer and the inside in the process of drying the coating film.

Therefore, the stone-like paint using these is heated after being painted, and the synthetic resin particles are attracted by this heating, and the components constituting the paint are fixed. After forming the gelled film as in this state, it can be further heated to remove solvent components such as water in the gelled film and dried to form a coating film.
However, since a gelled film is formed with water remaining, the constituents of the stone-like paint are fixed, and then dried to obtain a coating film, the part where the water is removed becomes fine bubbles, and the colored aggregate becomes colored. It is often difficult to reproduce the colors of.

This is because the presence of air bubbles in the clear film made of synthetic resin creates a turbid film. When the film becomes turbid in this way, it looks whitish as a coating film.
Therefore, when it is desired to reproduce a desired color, it is often difficult to adjust the color, for example, a darker colored aggregate is used.

For this reason, when the dye component is added when the heat-sensitive gelling agent is used, the black color, which is a dye component that has a lower lightness or a darker color and a lower lightness than the color of the coating film before the addition of the dye component. It is preferable to select and use from similar colors.
It is more preferable that the dye component is a color in which the difference in lightness is in the range of −0.3 to −20 with respect to the lightness of the coating film before the addition of the dye component.

Examples of this heat-sensitive gelling agent include zinc ammonium complex salts, nonionic surfactants, inorganic metal salts, polypropylene glycols, silicone polyether copolymers, polyvinyl methyl ethers, etc., and these are appropriately selected according to the required performance. And can be used.
The amount of the heat-sensitive gelling agent added is determined by the balance between the temperature to be gelled, the heating time, the stability of the stone-like paint, and the like.

To exemplify this addition amount, the solid content ratio of the synthetic resin emulsion is in the range of 0.1 to 10.0% by weight, and when the addition amount is small, gelation is not uniformly performed and is incomplete. In many cases, the stone-like paint may become unstable, and the paint during or stored in the paint may become gelled and hardened.
In addition, if there are many heat-sensitive gelling agents, the gelling temperature may drop to about room temperature, so caution is required. Therefore, it is necessary to consider the heating conditions such as heating temperature, heating time, heating equipment, and conditions for adding the heat-sensitive gelling agent, and set an appropriate amount of the heat-sensitive gelling agent to be added.

For this heating, forced drying such as far infrared rays and hot air is often used, and there are no particular restrictions, but those that are efficiently suitable for the heating conditions may be selected.
In this way, the heat-sensitive gelling agent changes the synthetic resin emulsion from a stable one to an unstable one, so it is necessary to find a gel point that maintains the stability of the stone-like paint. It is also necessary to confirm the basic physical properties such as the weather resistance of the stone-like coating film.

In the stone-like paint of the present disclosure, the color difference between lots of the paint due to the variation of the colored aggregate is reduced, so even when painting using it, the color difference such as the difference in the painting time and the difference in the paint lot is reduced. It is possible to reduce the color blurring of the coating film due to the drying conditions of the coating film.
Since this coating film is colored by colored aggregate and pigment components, it is highly durable against discoloration such as color loss of the coating film. Since it is such a stone-like paint, it is preferable to use the paint as a surface material obtained by coating the surface of the base material.

This means that even if the paint lot is different or the coating timing is different, a stable surface material with less color blurring or color difference of the coating film can be obtained.
Furthermore, as described above, the stone-like paint is an aqueous synthetic resin emulsion, and by using a heat-sensitive gelling agent, the color difference between lots of paint due to variations in colored aggregate, etc., even when painting with it. It is possible to reduce the color blurring of the coating film due to the difference in coating time and the drying conditions of the coating film.

Further, this surface material has a thickness in the range of 1 to 10 mm in many cases due to its ease of handling and a feeling of finish of the surface to be finished, and a thickness in the range of 2 to 7 mm is preferably used. Even if the film is coated and then heat-dried, the film does not swell during the drying process.
In addition, it has high durability against discoloration such as color loss of the coating film of the surface material.

This surface material includes plywood, slate plate, iron plate, ceramic siding, metal siding, ALC, GRC plate, PC plate and other plate-shaped base materials, non-woven fabric, woven cloth, paper, glass cloth, ceramic paper, synthetic paper, etc. The stone-like paint of the present disclosure is applied to sheet-like base materials such as those that are relatively thin, such as those that have been treated for these purposes, those that are made of plastic, those made of metal, and those made by molding polymer cement mortar into a sheet. It can be obtained by general decoration methods such as spray painting, painting using a roller for painting, coating with a coating machine such as a roll coater, and decoration such as screen printing.

The surface covering material thus obtained is attached to or installed on the surface of a building structure or the like to finish the building structure.
Among these, in the case of a sheet-like material as a base material, the effect of the stone-like paint to which the heat-sensitive gelling agent is added may be exhibited.

Sheet-like substrates such as non-woven fabrics are usually supplied as scrolls and have a small weight per unit area, and are therefore suitable for continuous coating. However, if the paint has fluidity after painting, it may be difficult to handle the surface material immediately after painting.
Therefore, by heating immediately after painting and gelling the emulsion of stone-like paint from a stable one to an unstable one in a relatively short time and eliminating its fluidity, the painted surface material can be handled. It will be easy.

In the sheet-shaped surface covering material in which the sheet-shaped base material is decorated in this way, the base material is easily bent, so that the coating film formed by the stone-like paint used for this is flexible. It is preferable to have.
This flexibility may be such that when the sheet-shaped surface material is bent along a cylinder having a diameter of 60 cm, cracks or cracks do not occur on the surface at that time.

By using the stone-like paint of the present disclosure for this surface material, the durability against discoloration of the surface of the surface material is increased, the design is good, and the design feeling of the finished wall surface is also improved.
Further, it is preferable that a clear layer is formed on the surface of the coating film, and it is preferably used because it can improve durability such as stain prevention and weather resistance of the surface.

This clear layer includes those formed by clear paint and those to which a clear film is attached.
According to the above embodiment, the following effects can be obtained.

A vehicle component containing a synthetic resin as a main component capable of forming a transparent film after being cured and dried and having a solid content in the range of 20 to 50% by weight, and a colored aggregate having a particle size in the range of 45 to 1000 μm. It is a mixed stone-like paint, and a pigment component is added to the stone-like paint to adjust the color, and the color difference between the color of the coating film before adjustment and the color of the coating film after adjustment is 10 or less in ΔE.
As a result, the color of the formed coating film is stabilized by reducing the color blurring of the coating film due to the variation of the colored aggregate and the color blurring of the coating film due to the drying conditions of the coating film. There is little discoloration and fading for a long period of time due to the coloring of the coating film by multiple coloring components, and even if there is discoloration, the change is slow, and the synthetic resin in the stone-like paint is well-balanced. Since the particle size of the colored aggregate is appropriate, the formed coating film has sufficient strength and is relatively smooth, and the pigment component does not impair the colorfulness of the colored aggregate in the coating film. It forms a film, facilitates mixing of paints, and has good storage stability.

When the ratio of the weight of the synthetic resin solid content in the vehicle component to the weight of the colored aggregate is in the range of 1: 1 to 1:10, the pigment component and the colored aggregate may be separated during the storage of the stone-like paint. The amount is small and the coating film does not become brittle.

The synthetic resin is an aqueous synthetic resin emulsion to which a heat-sensitive gelling agent is added, and the pigment component is a black color that is a pigment component having a lower brightness or a darker color and a lower brightness than the color of the coating film before the addition. And similar colors are selected and used.
As a result, the coating film formed is formed by efficiently drying the thick coating film, reducing the color blurring of the coating film due to the variation of the colored aggregate, and reducing the color blurring of the coating film due to the drying conditions of the coating film. The color of the film is stable and there is no sense of discomfort.

It is a flexible surface covering material having a thickness in the range of 1 to 10 mm obtained by applying the stone-like paint disclosed in the present application to the surface of a sheet-like base material.
As a result, the color blurring of the coating film and the swelling of the coating film due to the variation of the colored aggregate and the drying condition of the coating film are reduced, and the color with less color blurring of the coating film is stable even when the coating timing is different. Further, it is possible to obtain a surface material in which the coloration of the coating film by a plurality of coloring components of the colored aggregate and the pigment component causes less discoloration and fading for a long period of time, and even if there is discoloration, the change is gradual. Can be done.
The surface material immediately after painting can be easily handled, and the manufacturing efficiency can be improved.

Further, the above embodiment will be described in detail with reference to a formulation example. First, adjust the stone-like paint. This stone-like paint was adjusted by mixing it with colored aggregate after preparing the vehicle component.
As the synthetic resin that becomes transparent after drying and forming a film, this vehicle component is an acrylic synthetic resin emulsion having a glass transition temperature of −10 ° C. and a solid content of 45%. As various additives, a film-forming auxiliary, an antifoaming agent, a dispersant, a wetting agent, and a thickening agent were used. An example of blending vehicle components is shown below.

Vehicle component compounding example Acrylic synthetic resin emulsion 250.0 (g)
Membrane-forming aid 30.0 (g)
Defoamer 2.0 (g)
Dispersant 1.0 (g)
Wetting agent 0.5 (g)
Thickener 1.0 (g)
Blended water 15.5 (g)
Total 300.0 (g)

To 300 g of this vehicle component, 1000 g of colored aggregate was added and mixed to prepare a stone-like paint. For this colored aggregate, white cold water sand and black-colored silica sand were used as colored aggregates.
Two types of cold water sand were used, one having an average particle size of 55 μm and the other having an average particle size of 500 μm. 100 g of cold water sand having an average particle size of 55 μm and 200 g of cold water sand having an average particle diameter of 500 μm, and a total of 300 g of cold water sand were used as white colored aggregates.

The black colored aggregate is made by coloring silica sand with an enamel paint containing an acrylic synthetic resin emulsion as a main component, and after coloring, use a sieve with an opening of 300 μm and 850 μm, and a particle size range of 300 μm or more and less than 850 μm. The material adjusted to fit in was used as the colored aggregate. 700 g of this colored aggregate was taken to prepare a stone-like paint.
600 g of this 1300 g of stone-like paint was taken and divided into two, A and B, and the color of A was confirmed.

To confirm the color, the stone-like paint of A was applied to a slate plate having a thickness of 2 mm and dried in a constant temperature room at 23 ° C. for one day, and it was confirmed that the color was black. The black powder pigment was mixed with the stone-like paint of B to match the color of the black coating film, and the color was adjusted.
The color of the stone-like paint of B to which the color was toned was also confirmed, and the color difference between A and B was confirmed. This color difference was 3.6 in ΔE, which was almost the same color.

When the coating film of the stone-like paint of B was observed, white and black colored aggregates could be confirmed, and there was no discomfort even when compared with the coating film of A.
The coating films of A and B were used as test bodies, and an exposure test was conducted for one year. The exposure test was carried out by placing the test piece on an exposure table under the condition of 30 ° south surface installed on the roof of a three-story building. The rooftop of the building where the exposure stand was installed was a place where there were no obstacles blocking the sunlight even during the winter solstice and summer solstice.

It was confirmed that the coating film A had some deterioration and faded, but the coating film B also had some deterioration of the resin, but it was confirmed that there was almost no fading. This is because the stone-like paint of B has less discoloration and fading due to the coloring of the coating film by a plurality of coloring components of the colored aggregate and the pigment component.
Next, the conditions for forming the coating film of the stone-like paints A and B were set in direct sunlight in midsummer, and the stone-like paint was left as it was for one day to dry.

The coating film of A had a whiteish gray color as compared with the coating film formed in a constant temperature room. When the coating film was observed, there were many bubbles in the coating film, so that the coating film appeared to be blurred. The coating film B had more bubbles in the coating film than the coating film formed in a constant temperature room, but the color tone was almost the same.
The lots of colored aggregates of the stone-like paint of the above compounding example were changed, and the color of the coating film was confirmed due to the variation of the colored aggregates. The number of lots was 3 types.

Again, after adjusting 1300 g of stone-like paint in the same manner as above, take 600 g each, divide into two parts A and B, and adjust the color of B with a black powder pigment to determine the color difference between the coating films of A and B. It was measured. In addition, the colors of lots (1), (2), and (3) were confirmed.
To confirm the color, the stone-like paint of A was applied to a slate plate having a thickness of 2 mm and dried, and it was confirmed that the color was black.

The color of the stone-like paint of B to which the color was toned was also confirmed, and the color difference between A and B was confirmed. This color difference was 3.4 in ΔE, which was almost the same color.
The color difference of the coating film of the stone-like paint of A of lots (1) to (3) was in the range of 3 to 5 in ΔE for lots (2) and (3) with respect to lot (1). On the other hand, the color difference of the coating film of the stone-like paint of B was in the range of 1 to 4 in ΔE for lots (2) and (3) with respect to lot (1). As described above, the degree of color blur was greater in the paint film A than in the paint film B.

The color difference between the coating films A and B of the lot (1) was 3.7 in ΔE, which were almost the same color. The color difference between A and B in the coating films of lots (2) and (3) was about 3.5 in ΔE, which was almost the same color.
In this way, the color of the formed coating film is stable, such as reducing the color blurring of the coating film due to the variation of the colored aggregate and the color blurring of the coating film due to the drying conditions of the coating film. There was little long-term discoloration and fading due to the coloring of the coating film by the plurality of coloring components.

Further, 7% of a heat-sensitive gelling agent of zinc ammonium complex salt was added to the stone-like paint having the above composition. The active ingredient of this heat-sensitive gelling agent was 10%.
Also, take 600g of stone-like paint of about 1300g each and divide it into C and D. For D, match the color of the black coating film and mix the black powder pigment with the stone-like paint of D to adjust the color. Was performed, and each coating film was formed and confirmed.

To form this coating film, C and D stone-like paints were applied to a slate plate having a thickness of 5 mm and dried in a constant temperature room at 150 ° C. for 30 minutes.
The coating films of C and D had the effect of a heat-sensitive gelling agent, and formed a sound coating film without swelling. Regarding the color of the coating film, the coating film of C was gray and the coating film of D was black, which were different in appearance.

The color difference between C and D was confirmed. This color difference was 12 in ΔE, which was significantly different. When the coating film was observed, it was confirmed that there were many bubbles in these two coating films. It is presumed that due to the influence of these bubbles, there is a difference between the one with the pigment added and the one without the pigment.
The colors of the coating films A and B and the coating films C and D after being dried in the above-mentioned constant temperature room at 23 ° C. were also compared. The coating films of A, B and D could be visually confirmed to have almost the same color, and the color difference was within 4 in ΔE as compared with the coating film A.

In this way, the color of the formed coating film is stable, such as reducing the color blurring of the coating film while efficiently drying the thick coating film, and reducing the color blurring of the coating film due to the drying conditions of the coating film. there were.

Claims (3)

A stone-like paint in which a synthetic resin capable of forming a transparent film after being cured and dried and a colored aggregate having a particle size in the range of 37 to 2000 μm are mixed.
Add a pigment component to the stone-like paint to adjust it.
A stone-like paint in which the color difference between the color of the coating film before adjustment and the color of the coating film after adjustment is 10 or less in ΔE. The stone-like paint according to claim 1, wherein the synthetic resin is an aqueous synthetic resin emulsion and a heat-sensitive gelling agent is added. A surface covering material obtained by coating the surface of a base material with the stone-like paint according to claim 1 or 2.