JP5075191B2 - Painted parts for home appliances, paints and home appliances - Google Patents

Description

  The present invention relates to a coating component for home appliances, a paint used for the same, and a home appliance using the same.

  In general, many home appliance parts such as painted steel plates, glass, and resins are used for exterior members of home appliances. In particular, since the resin is cheaper and lighter than other materials, various resins are used depending on the part of the home appliance. Among them, polypropylene is often used as a part for home appliances because of its excellent chemical resistance and high strength. However, the resin (particularly polypropylene) has a problem that it is difficult to apply the coating.

Conventionally, as a resin coloring technique, one in which a pigment is dispersed in the resin itself is known (for example, see Patent Document 1). According to this coloring technique, it is possible to obtain a resin-made home appliance part having a texture derived from a pigment.
However, this coloring technique has a problem that it is difficult to apply to large-sized home appliance parts in terms of moldability because the amount of pigment used increases. Moreover, since the component for household appliances obtained by this coloring technique contains many pigments, there exists a subject that recyclability worsens.

On the other hand, as a method for coating a resin (for example, polypropylene), a method in which a primer (undercoat) such as chlorinated polyolefin is applied to the resin and then applied is widely known. According to this coating method, it is possible to apply a wide variety of paints on the resin by selecting a primer that has adhesion to both the resin and the coating film.
However, in the coating method using a primer, not only the number of undercoating steps increases, but also the impact on the environmental load due to the increase in the amount of solvent used becomes a new issue.

Thus, in order to solve this problem, a paint for polypropylene containing a 2-hydroxyethyl methacrylate-modified propylene polymer and a urethane-modified propylene polymer has been disclosed (for example, see Patent Document 2).
According to this paint, it can be directly applied on the resin without using a primer. Therefore, according to this primer-less paint, it is not necessary to use the solvent contained in the primer, so that the environmental load can be kept low.

JP 2004-83608 A JP 2003-313331 A

However,
The coating film of the conventional primerless coating (for example, refer patent document 2) also has the new subject that the chemical resistance and hardness with respect to a detergent, a bleaching agent, etc. become inadequate.
Therefore, the conventional primer-less coating material (for example, refer patent document 2) was not applicable to the component for household appliances requested | required to have sufficient chemical resistance and hardness.

  Accordingly, an object of the present invention is to have a one-coat film excellent in adhesion without using a primer on a resin base material, and to have hardness and chemicals higher than those obtained with conventional primer-less paints. It is providing the coating component for household appliances which has a coating film excellent in tolerance, the coating material used for this, and the household appliances which use this.

The present invention that has solved the above problems is a coating component for home appliances having a resin base material and a coating film formed on the surface of the base material, wherein the coating film has a crosslinkable functional group. Mass of polyfunctional (meth) acrylate polymer comprising polyfunctional (meth) acrylate consisting only of those having 3 or more in the molecule, and (meth) acryl-modified chlorinated polyolefin, in the coating film The mass percentage (100 Mb / (Ma + Mb)) of the mass (Mb) of the (meth) acryl-modified chlorinated polyolefin to the total amount of (Ma) and the mass (Mb) of the (meth) acryl-modified chlorinated polyolefin is 40%. Above, it is characterized by being 60% or less.

In addition, the present invention that has solved the above-described problems is a polyfunctional (meth) acrylate composed only of those having three or more crosslinkable functional groups in one molecule, (meth) acryl-modified chlorinated polyolefin, and the polyfunctional (meta) And a polymerization initiator for initiating a polymerization reaction of acrylate, wherein the (meth) acryl-modified chlorinated polyolefin is mixed in the polyfunctional (meth) acrylate and the (meta) ) 40 parts by mass or more and 60 parts by mass or less with respect to 100 parts by mass of the total amount of the acrylic-modified chlorinated polyolefin.

In addition, the present invention that has solved the above problems is a home appliance using a coating part for home appliances having a resin base material and a coating film formed on the surface of the base material, A polyfunctional (meth) acrylate polymer consisting only of those having three or more crosslinkable functional groups in one molecule, and a (meth) acryl-modified chlorinated polyolefin, ) The mass percentage of the mass (Mb) of the (meth) acryl-modified chlorinated polyolefin to the total amount of the mass (Ma) of the polymer of acrylate and the mass (Mb) of the (meth) acryl-modified chlorinated polyolefin (100 Mb / ( Ma + Mb)) is 40% or more and 60% or less.

  According to the present invention, a single-coated film having excellent adhesion without using a primer is provided on a resin base material, and the hardness and chemical resistance are higher than those obtained with conventional primer-less paints. It is possible to provide a coating part for home appliances having an excellent coating film, a paint used for the same, and a home appliance using the same.

(A) is a perspective view of a washing / drying machine as a home electric appliance provided with the paint part (cover) for home appliances of the present invention, and (b) is a partial cross-sectional view of the paint component (cover) for home appliances of the present invention. FIG. 3 is a partial cross-sectional view partially showing a cross section of Ib-Ib in (a). (A)-(c) is process drawing which shows typically the manufacturing process of the coating component (lid body) for household appliances shown in FIG.1 (b).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. Here, after first explaining the lid (coating part for home appliances) used for the washing and drying machine (home appliance) of the present invention, the paint used for the lid will be explained. In the following description, the front / rear and up / down directions are based on the front / rear and up / down directions shown in FIG.

(Household appliances and painted parts for home appliances)
As shown to Fig.1 (a), the washer-dryer L has mounted on the upper part of the base 4 the outer frame 5 comprised combining the steel plate and the resin molded product. Above the outer frame 5 is disposed a lid 1 that closes an opening (not shown) for taking in and out the laundry so as to be freely opened and closed.
The washing / drying machine L corresponds to a “home appliance” in the claims, and the lid 1 corresponds to a “coating part for home appliances” in the claims.

  In FIG. 1A, reference numeral 6 denotes a top cover, and the top cover 6 is fixed to the upper edge portion of the outer frame 5. The top cover 6 forms the above-described opening for taking in and out the laundry, and the lid 1 is attached to both sides of the opening edge via a pair of first hinges 7a and 7a. Incidentally, although not shown, a washing / dehydrating tub is provided inside the outer frame 5, and the lid 1 is disposed on the washing / dehydrating tub via a predetermined inner lid.

  As shown in FIG. 1A, the lid 1 in the present embodiment has a substantially rectangular shape in plan view, and the first half 1a having the operation panel 8 disposed on the upper surface and the second half 1b are first. The two hinges 7b are connected to each other.

  When the rear body 1b rotates backward around the first hinges 7a and 7a, the lid body 1 is fold-backed at the second hinge 7b portion, and the front end of the front half body 1a slides backward. The opening described above is opened.

  As shown in FIG. 1B, the lid 1 is formed of a base material 3 and a coating film 2 formed on the surface of the base material 3.

The base material 3 is a plate body made of polypropylene.
As this polypropylene, a grade having a small rubber component and excellent chemical resistance is desirable. By the way, in general, polypropylene having a small rubber component is said to have particularly poor adhesion of the coating film.
FIG. 1 (b) partially shows only the upper side of the base material 3, that is, the upper side of the lid 1 shown in FIG. 1 (a). FIG. 1B shows a state in which a coating film 2 to be described next is formed only on the upper surface of the substrate 3. This coating film 2 is formed on the entire surface of the substrate 3 ( It is formed so as to cover the front and back and all including the edge.

  The coating film 2 is a cured product of the coating material of the present invention applied to the surface of the substrate 3, in other words, as described in detail later, a polyfunctional (meth) having three or more crosslinkable functional groups in one molecule. It contains a polymer obtained by polymerizing acrylate and (meth) acryl-modified chlorinated polyolefin.

  The polyfunctional (meth) acrylate in the present embodiment has a crosslinkable functional group having a polymerizable carbon-carbon double bond such as a (meth) acryl group, a vinyl group, or an allyl group, as described in detail later. The polymer is considered to mainly improve the hardness, weather resistance, and chemical resistance of the coating film 2. Incidentally, it is desirable that three or more crosslinkable functional groups of the polyfunctional (meth) acrylate have three or more crosslinkable functional groups per unit of the polyfunctional (meth) acrylate in the polymer.

  In addition, the (meth) acryl-modified chlorinated polyolefin in the present embodiment is considered to mainly improve the adhesion of the coating film 2 to the substrate 3 (polypropylene). However, the effects of the polyfunctional (meth) acrylate polymer and the (meth) acryl-modified chlorinated polyolefin in the coating film 2 are considered to be exhibited in cooperation with each other. The polymer and the (meth) acryl-modified chlorinated polyolefin need to be contained in the coating film 2 in the following ratio.

  Specifically, the coating film 2 is a (meth) acryl-modified chlorinated polyolefin with respect to the total amount of the mass (Ma) of the polyfunctional (meth) acrylate polymer and the mass (Mb) of the (meth) acryl-modified chlorinated polyolefin. The mass percentage (100 Mb / (Ma + Mb)) of the mass (Mb) must be 40% or more and 60% or less.

  Thus, by setting the ratio of the (meth) acryl-modified chlorinated polyolefin in the coating film 2 to the above-described range, the coating film 2 has all the adhesion, hardness and chemical resistance to the base material 3 (polypropylene). It will be excellent.

Moreover, the coating film 2 can further contain a pigment.
There is no restriction | limiting in particular as a pigment, A well-known pigment can be used. Among them, a scale-like metal foil having a thickness of 0.01 mm or less or a powdered inorganic substance can impart a surface state having a high metallic color and high reflection luminance to the coating film 2 with a small amount of use, and is a coating part for home appliances. This is particularly preferable because the design properties can be varied.

Examples of the scale-like metal foil include aluminum flakes, stainless steel flakes, nickel flakes and the like.
Examples of the powdery inorganic substance include mica, titania, glass and the like.

The ratio of the pigment in the coating film 2 in the present embodiment is the ratio of the pigment to the total amount of the mass (Ma) of the polyfunctional (meth) acrylate polymer and the mass (Mb) of the (meth) acryl-modified chlorinated polyolefin. The mass (Mc) ratio (100 Mc / (Ma + Mb)) is desirably set to 50 or less.
The coating film 2 containing the pigment in such a range can express the texture of the pigment without inhibiting the adhesion, hardness and chemical resistance to the base material 3 (polypropylene).

Further, it is desirable that the pigment has a surface coated with organic molecules, and the organic molecules are chemically bonded to the polyfunctional (meth) acrylate polymer.
Such an organic molecule has a functional group covalently bonded to a functional group present on the surface of the pigment particle and a crosslinkable functional group that polymerizes with the crosslinkable functional group of the polyfunctional (meth) acrylate. Is desirable.

Examples of such organic molecules include, for example, silane coupling agents such as 3-methacryloxypropyltrimethoxysilane and 3-acryloxypropyltrimethoxysilane, but in addition to these, thiol-based, carboxylic acid-based, and phosphoric acid Examples thereof include various coupling agents having a crosslinkable functional group of a binding component with a pigment such as a system, an aluminum chelate or a titanate and (meth) acrylate.
The coating amount of such organic molecules on the pigment may be such that a monomolecular film of organic molecules is formed on the surface of the pigment.

  The pigment coated with such organic molecules improves the degree of cure of the entire coating film 2 by forming a chemical bond with the polyfunctional (meth) acrylate polymer in the coating film 2, and the entire coating film 2 Can increase the durability.

  In addition, pigments coated with such organic molecules have good dispersibility in polyfunctional (meth) acrylates, (meth) acryl-modified chlorinated polyolefins, or mixtures thereof in paints described below. It can be demonstrated.

  In addition, the pigment coated with such organic molecules is used when the polymerization of polyfunctional (meth) acrylate contained in the paint described below is performed by ultraviolet irradiation or electron beam irradiation (hereinafter simply referred to as “photopolymerization”). In some cases, the inclusion of pigments promotes the polymerization reaction with organic molecules that coat the pigments even if the radiation dose to the polyfunctional (meth) acrylates in the paint interior (deep) is reduced. Is preferable.

  The thickness of the coating film 2 as described above can be set to a thickness usually performed in the field related to the coating of home appliances.

(paint)
The paint according to the present embodiment is most suitable for the coating of polypropylene, and as will be described later, in the present embodiment, the base material 3 made of polypropylene as a “resin molded body” in the claims ( This is applied to FIG. 2 (a).
As described above, this paint starts polymerization reaction of polyfunctional (meth) acrylate having 3 or more crosslinkable functional groups in one molecule, (meth) acryl-modified chlorinated polyolefin, and polyfunctional (meth) acrylate. A polymerization initiator.

  As described above, the polyfunctional (meth) acrylate in the present embodiment includes, for example, a crosslinkable functional group having a polymerizable carbon-carbon double bond such as a (meth) acryl group, a vinyl group, or an allyl group in one molecule. 3 or more.

  Specific polyfunctional (meth) acrylates include, for example, dipentaerythritol hexaacrylate, dipentaerythritol monohydroxypentaacrylate, alkyl-modified dipentaerythritol pentaacrylate, alkyl-modified dipentaerythritol tetraacrylate, alkyl-modified dipentaerythritol tris. Acrylate, caprolactone modified dipentaerythritol hexaacrylate, ditrimethylolpropane tetraacrylate, glycerol triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, pentaerythritol tetramethacrylate, phosphate triacrylate, trimethylolpropane triacrylate, tris (acryloxy) Ethyl) isocyanurate , Tris (methacryloxyethyl) isocyanurate, and derivatives thereof. Moreover, as a polyfunctional (meth) acrylate in this embodiment, in addition to a monomer, for example, an oligomer containing three or more polymerizable carbon-carbon double bonds such as polyester acrylate, epoxy acrylate, urethane acrylate, and polybutadiene acrylate is used. You can also.

Examples of the (meth) acryl-modified chlorinated polyolefin include those obtained by graft polymerization of a (meth) acryl monomer to a chlorinated polyolefin in the presence of a peroxide.
Specific examples of the (meth) acrylic monomer include (meth) acrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate. Etc.
The (meth) acryl-modified chlorinated polyolefin is a hydroxyl group-containing (meth) acryl-modified chlorinated polyolefin obtained by graft polymerization of a hydroxyl group-containing (meth) acryl monomer to a chlorinated polyolefin in the presence of a peroxide. There may be.
Examples of the hydroxyl group-containing (meth) acrylic monomer used here include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and the like.

The number average molecular weight (Mn) of such (meth) acryl-modified chlorinated polyolefin is preferably set within the range of 1000 to 500,000.
In addition, the chlorination degree (chlorine content) of the (meth) acryl-modified chlorinated polyolefin is preferably set within a range of 1 to 50% by mass.
Incidentally, parameters such as the number average molecular weight (Mn), chlorination degree (chlorine content), and graft polymerization conditions of the (meth) acryl-modified chlorinated polyolefin are the above-mentioned polyfunctional (meth) acrylate and a polymerization initiator described later, It can be appropriately set in consideration of compatibility with other components of the paint such as a solvent, and further physical properties such as hardness imparted to the coating film 2 (see FIG. 1B).
As such a (meth) acryl-modified chlorinated polyolefin in this embodiment, a commercially available product can also be used.

The amount of polyfunctional (meth) acrylate and (meth) acryl-modified chlorinated polyolefin in the paint is the amount of polyfunctional (meth) acrylate and (meth) acryl-modified chlorine. 40 parts by mass or more and 60 parts by mass or less with respect to 100 parts by mass of the total amount of the modified polyolefin.
Incidentally, the blending amount of the polyfunctional (meth) acrylate in this embodiment is 40 parts by mass or more and 60 masses with respect to 100 parts by mass of the total amount of the polyfunctional (meth) acrylate and the (meth) acryl-modified chlorinated polyolefin. However, the blending amount is defined by the blending amount when all polyfunctional (meth) acrylates are polymerized.

  In this paint, the adhesiveness and hardness with respect to the base material 3 (polypropylene) shown in FIG. And the coating film 2 (refer FIG.1 (b)) excellent in all chemical-resistance can be formed.

The polymerization initiator is one that initiates polymerization (crosslinking) of the polyfunctional acrylate in the paint by energy such as heat and light to cure the paint.
Examples of the polymerization initiator include radical polymerization initiators, cationic polymerization initiators, anionic polymerization initiators, various transition metal-based polymerization catalysts, and the like. In addition, when performing photopolymerization, various photopolymerization initiators such as benzoin-based, acetophenone-based, thioxanthone-based, and peroxide-based photopolymerization initiators (radical polymerization initiation) are selected depending on the type of metal halide lamp, high-pressure mercury lamp, ultraviolet LED, etc. Agent) can be appropriately selected and used.
Commercially available products can also be used as the polymerization initiator in the present embodiment.

The blending amount of the polymerization initiator in the coating can be selected appropriately depending on the polymerization method of thermal polymerization or photopolymerization, or according to the polymerization rate, etc., but the polyfunctional (meth) acrylate 100 mass It is desirable to set within a range of 0.01 parts by mass or more and 20 parts by mass or less with respect to parts.
A paint containing a polymerization initiator in such a range can form a coating film 2 (see FIG. 1B) having better durability and physical properties.

The paint can contain the above-described pigment.
The amount of the pigment in the coating is desirably 50 parts by mass or less with respect to 100 parts by mass as the total amount of the polyfunctional (meth) acrylate and (meth) acryl-modified chlorinated polyolefin.
In this paint, by making the blending amount of the pigment within the above-mentioned range, the adhesion, gloss, hardness and chemical resistance to the base material 3 (polypropylene) shown in FIG. A texture can be expressed.

Moreover, the coating material which concerns on this embodiment can contain various solvents.
Examples of the solvent include 2-butanone, dimethylacetamide, toluene, xylene, methyl acetate, ethyl acetate, butyl acetate, acetone, methanol, ethanol, 2-propanol, n-butanol, 2-methylpropanol, and 4-hydroxy-4. -Methyl-2-pentanone, ethylene glycol, methyl cellosolve, ethyl cellosolve, butyl cellosolve and the like. These solvents can be used alone or in combination of two or more according to the temperature and humidity of the environment in which the paint is prepared.
In addition to these solvents or alone, a reactive diluent such as a monofunctional (meth) acrylate or a vinyl monomer may be used as a solvent.

  The solvent in this embodiment can adjust the viscosity of the above-mentioned polyfunctional (meth) acrylate and (meth) acryl-modified chlorinated polyolefin, and handle these (such as adjustment of solubility) when preparing a paint. make it easier. Moreover, according to these solvents, the fluidity and drying speed of the obtained paint can be adjusted.

  Moreover, the coating material which concerns on this embodiment can contain other components, such as a plasticizer, a desiccant, a dispersing agent, an anti-settling agent, an antifungal agent, a leveling agent, and a stabilizer.

  The coating material according to this embodiment can be obtained by mixing with a known mixer or the like so that the above-described constituent components are uniform.

(Manufacturing method of painted parts for home appliances)
Next, the manufacturing method of the cover body 1 (refer FIG.1 (b)) as a coating component for household appliances is demonstrated. Next, FIGS. 2A to 2C to be referred to are process diagrams schematically showing a manufacturing process of the lid 1.
As shown in FIG. 2A, in this manufacturing method, first, a substrate 3 is prepared. This base material 3 is a molded product of polypropylene having substantially the same shape as the outer shape of the lid body 1 (second half body) shown in FIG. This base material 3 corresponds to a “resin molding” in the claims.

Next, the surface of the base material 3 is coated with the above-described coating material. Prior to this coating, the base material 3 can be subjected to a surface treatment.
As this surface treatment, for example, a washing treatment with water, ethanol, hexane or the like, a flame treatment, an ultraviolet irradiation, a corona discharge, a washing treatment with plasma or the like can be mentioned.

Next, as shown in FIG. 2 (b), the base material 3 is coated with the paint 10 described above. Incidentally, FIG. 2B schematically shows a process assuming a case where the paint 10 containing a solvent is used, but the base material 3 may be coated using a paint containing no solvent. .
The coating method is not particularly limited, and a known coating method such as a spray method can be used.

Next, after the coating material 10 applied to the base material 3 is dried to remove the solvent in the coating material, the coating material 10 is cured by polymerizing the polyfunctional (meth) acrylate contained in the coating material 10. As the polymerization method of the polyfunctional (meth) acrylate, as described above, any polymerization method of thermal polymerization and photopolymerization can be used.
As a result, as shown in FIG. 2 (c), a lid body 1 as a home appliance paint component having a coating film 2 on a base material 3 is obtained.
In the cured coating film 2, the (meth) acryl-modified chlorinated polyolefin is uniformly present in the polyfunctional (meth) acrylate polymer.

  The difference between the thickness of the paint 10 shown in FIG. 2B and the thickness of the coating film 2 shown in FIG. 2C schematically shows how the solvent is removed by drying the paint 10. 2 (b) and 2 (c) do not show the relative difference between the thickness of the paint 10 and the thickness of the coating film 2, and the paint 10 after removing the solvent (the following It does not indicate the actual thickness of the description.

According to the coating material according to the present embodiment as described above, all of adhesion, hardness, and chemical resistance are excellent as compared with a coating film obtained with a conventional primerless coating material (see, for example, Patent Document 2). The lid 1 (coating part for home appliances) having the coated film 2 and the washing / drying machine L (home appliance) using the lid 1 can be obtained.
Moreover, according to the coating material which concerns on this embodiment, the cover body 1 (coating part for household appliances) which has the coating film 2 of 1 coat on a base material 3 (polypropylene) without a primer, and this cover body 1 The used washer-dryer L (home appliance) can be obtained.
Therefore, according to the paint, the lid 1 (coating part for home appliances), and the washing / drying machine L (home appliance) according to the present embodiment, since the primer is not used, the manufacturing process and the manufacturing cost are reduced and the productivity is reduced. As well as improving, it is not necessary to use the solvent contained in the primer, so the environmental load can be kept low. In particular, the coating material according to this embodiment can make the coating film 2 adhere to polypropylene having a small rubber component.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, It can implement with a various form.
In the said embodiment, although the coating material for polypropylene and the cover body 1 (coating part for household appliances) which has the base material 3 made from polypropylene, and the washer / dryer L (home appliances) using this lid body 1 were demonstrated, The coating material of the present invention can also be used for the base material 3 made of other polyolefins such as polystyrene and other resins (for example, ABS resin), and the coating film 2 has adhesion and hardness to the base material 3. And excellent chemical resistance.

  Moreover, although the said embodiment demonstrated the lid 1 of the washing-drying machine L as a household appliance, and the washing-drying machine L as a coating component for household appliances, the household appliance and household appliance coating component to which this invention is applied are However, the present invention is not limited to this, and is used at least for resin-made home appliance paint parts that are desired to be coated, specifically, home appliances such as vacuum cleaners, rice cookers, air conditioners, and air purifiers. It can be applied to painted parts for home appliances. In addition to the above-described washing and drying machine L, the present invention is a household appliance such as a washing machine and a dryer used in a harsh environment where friction with laundry and contact with detergents, bleaches, etc. can always occur. And it is preferable to be applied to coating parts for home appliances.

  Moreover, in the said embodiment, although the thing which does not contain a pigment in the base material 3 is assumed, this invention may contain a pigment in the base material 3. FIG.

Next, examples in which the effects of the present invention have been confirmed will be described with reference to FIGS. 1A and 1B as appropriate, but the present invention is not limited thereto.
(Example 1 to Example 5)
In this example, a resin plate member (base material 3) having substantially the same shape as the lid 1 (second half 1b) was produced by an injection molding method.
Polypropylene (manufactured by Sun Allomer, trade name: PM970W) was used as the resin.
On the other hand, the coating materials used in Examples 1 to 5 were prepared.
The paints are polyfunctional acrylic monomers shown in Table 1 below, acrylic-modified chlorinated polyolefin (manufactured by Nippon Paper Chemical Co., Ltd., trade name Supercron (registered trademark) 223M), and polymerization initiator (manufactured by Nagase Sangyo Co., Ltd., trade name Irgacure). (Registered Trademark) 184) was included in the blending amounts shown in Table 1, and 100 parts by mass of toluene as a solvent was further used, which was uniformly mixed.

  In Table 1, dipentaerythritol hexaacrylate abbreviated as “DPHA” as the polyfunctional acrylic monomer has six crosslinkable functional groups, and pentaerythritol tetraacrylate abbreviated as “PETeA” as the polyfunctional acrylic monomer is The trimethylolpropane ethoxytriacrylate, which has four crosslinkable functional groups and is abbreviated as “TMPETA” as a polyfunctional acrylic monomer, has three crosslinkable functional groups.

  Further, Supercron (registered trademark) 223M as the acrylic-modified chlorinated polyolefin is chlorinated polypropylene (chlorination rate: 25%), the acrylic resin ratio is 20/80 (solid content ratio), and the weight average molecular weight is 100,000. It is. Further, Irgacure (registered trademark) 184 as a polymerization initiator is a radical photopolymerization initiator.

  Next, in Example 1 to Example 5, the prepared coating material was applied to the above-described resin plate-like member (base material 3) by a spray method, and after the setting time of 5 minutes had passed, the condition was 80 ° C. The coating material was dried by volatilizing the solvent in the coating material by performing a heat treatment for 10 minutes in an explosion-proof drying furnace.

Next, the dried paint was irradiated with ultraviolet rays using a high-pressure mercury lamp (USHIO Inc.) to cure the paint. In addition, ultraviolet irradiation was performed on the conditions used as the integrated light quantity of 1000 mJ / cm < ² > in nitrogen atmosphere.
As a result, in Example 1 to Example 5, a clear coating film 2 having an average thickness of 15 μm is formed on the surface of the resin plate-like member (base material 3), and the lid 1 as a coating part for home appliances. (Second half 1b) was obtained.

  Next, in Example 1 to Example 5, the following adhesion test, gloss determination, hardness test, and chemical resistance test were performed on the obtained coating film 2.

<Adhesion test>
In this adhesion test, the adhesion of the coating film 2 to the substrate 3 was evaluated by a cross-cut method based on JIS-K5600-5-6. The adhesive tape includes the product name Cello Tape (registered trademark) No. 405 was used. The evaluation results are shown in Table 1.
In the evaluation of adhesion, “◯” indicates that no peeling of the coating film 2 was observed, and “△” indicates that the coating film 2 at the corner of the crosscut peeled, and most of the coating film 2 was peeled off. The thing was made into "x".

<Gloss determination>
In this gloss determination, the presence or absence of gloss was determined by visually observing the coating film 2 under natural daylight. The results are shown in Table 1. In the gloss judgment, “◯” indicates that the gloss was recognized, and “X” indicates that the gloss was not recognized.

<Hardness test>
In this hardness test, scratch hardness (pencil hardness) based on JIS-K5600-5-4 was evaluated. As the pencil, a trade name Hi-uni manufactured by Mitsubishi Pencil Co., Ltd. was used. The results are shown in Table 1 as hardness.

<Chemical resistance test>
In this chemical resistance test, undiluted solutions of a washing liquid softener (made by Lion, trade name Akron) and a washing liquid detergent (made by Kao Corporation, trade name Attack) are dropped onto the paint film 2, respectively. The change in appearance after standing at 40 ° C. for 24 hours was visually observed. The results are shown in Table 1. Evaluation of chemical resistance is “○” when there is no change in appearance for both the washing liquid softener and the laundry liquid detergent, and for either the washing liquid softener or the laundry liquid detergent. In addition, the case where slight fogging occurred was indicated by “Δ”, and the case where clear fogging occurred for any of the washing liquid softener and the washing liquid detergent was indicated by “x”.

(Comparative Example 1 to Comparative Example 5)
In this comparative example, the polyfunctional acrylic monomer shown in Table 1, acrylic-modified chlorinated polyolefin (manufactured by Nippon Paper Chemical Co., Ltd., trade name Supercron (registered trademark) 223M), and polymerization initiator (manufactured by Nagase Sangyo Co., Ltd., trade name Irgacure) (Registered Trademark) 184) in the amounts shown in Table 1, and further, 100 parts by mass of toluene as a solvent was used, and Examples 1 to 5 were used except that a paint in which these were uniformly mixed was used. In the same manner as in Example 1, a coating material was prepared, and using this coating material, the coating film 2 was formed on the substrate 3 in the same manner as in Examples 1 to 5.
In Comparative Example 5 of Table 1, 1,6-hexanediol diacrylate, which is abbreviated as “HDDA” as the polyfunctional acrylic monomer, has two crosslinkable functional groups.
And about the obtained coating film 2, the adhesiveness test, the glossiness determination, the hardness test, and the chemical-resistance test were done like Example 1- Example 5. FIG. The results are shown in Table 1.

(Example 6 and Example 7)
In this example, the polyfunctional acrylic monomer shown in Table 1, acrylic-modified chlorinated polyolefin (manufactured by Nippon Paper Chemical Co., Ltd., trade name Supercron (registered trademark) 223M), and polymerization initiator (manufactured by Nagase Sangyo Co., Ltd., trade name Irgacure) (Registered Trademark) 184) in a blending amount shown in Table 1, 100 parts by weight of toluene as a solvent, and further 5 parts by weight of a pigment shown in Table 1 were prepared to prepare a paint in which these were uniformly mixed. .

As the pigment, aluminum flakes subjected to surface treatment were used.
The surface-treated aluminum flakes of Example 6 were obtained by the following method.
In this method, first, a silane coupling agent solution in which 0.01 g of 3-methacryloxypropyltrimethoxysilane (trade name KBM503, manufactured by Shin-Etsu Silicone Co., Ltd.) was dissolved in 50 g of toluene was prepared. Next, a dispersion obtained by dispersing 1 g of aluminum flakes (trade name: 5660NS, manufactured by Toyo Aluminum Co., Ltd.) in 50 g of toluene was added to the silane coupling agent solution heated to 70 ° C., and the mixture was stirred and mixed for 10 minutes. Thereafter, the mixture was cooled to room temperature to separate a precipitate, and the precipitate was washed with toluene and dried to obtain surface-treated aluminum flakes.

  The surface-treated aluminum flakes of Example 7 were replaced with 3-acryloxypropyltrimethoxysilane (Shin-Etsu Silicone Co., Ltd.) instead of 3-methacryloxypropyltrimethoxysilane (Shin-Etsu Silicone Co., Ltd., trade name KBM503) of Example 6. This was obtained in the same process as in Example 6 except that the product name KBM5103) was used.

Next, the coating film 2 was formed on the base material 3 in the same manner as in Examples 1 to 5 using the prepared coating material. The coating film 2 had a metallic color tone.
And about the obtained coating film 2, the adhesiveness test, the glossiness determination, the hardness test, and the chemical-resistance test were done like Example 1- Example 5. FIG. The results are shown in Table 1.

(Evaluation result of coating film)
As shown in Table 1, the coating film 2 of Examples 1 to 5 shows good results in any of the adhesion test, the gloss determination, the hardness test, and the chemical resistance test.
Moreover, the coating film 2 of Example 6 and Example 7 containing the pigment surface-treated with the silane coupling agent which has a (meth) acryl group is any of an adhesion test, a gloss determination, a hardness test, and a chemical resistance test. Also shows particularly good results.

  On the other hand, in Comparative Example 1 and Comparative Example 2, the mass percentage of the acrylic-modified chlorinated polyolefin with respect to the resin component in the coating film 2 (the total amount of the polyfunctional acrylate polymer and the acrylic-modified chlorinated polyolefin) is 60%. As a result, the hardness and chemical resistance of the coating film 2 are inferior to those of Examples 1 to 5.

  In Comparative Example 3 and Comparative Example 4, the mass percentage of the acrylic modified chlorinated polyolefin with respect to the resin component in the coating film 2 (the total amount of the polymer of polyfunctional acrylate and the acrylic modified chlorinated polyolefin) is less than 40%. As a result, the adhesion of the coating film 2 to the substrate 3 is inferior to that of Examples 1 to 5.

  In Comparative Example 5, since the polyfunctional acrylate having less than three crosslinkable functional groups is used, the hardness and chemical resistance of the coating film 2 are compared with those in Examples 1 to 5. It is inferior.

  As described above, according to the coating material according to the present invention, it was confirmed that the coating film 2 excellent in all of adhesion, gloss, hardness, and chemical resistance to the polypropylene base material 3 can be obtained.

1 Lid (painted parts for home appliances)
1a Front half (painted parts for home appliances)
1b Second half (painted parts for home appliances)
2 Coating 3 Base material (resin molding)
10 Paint L Washer / Dryer (Household appliances)

Claims (6)

A resin base material;
A coating film formed on the surface of the substrate;
Coating parts for home appliances having
The coating film includes a polyfunctional (meth) acrylate polymer consisting only of those having three or more crosslinkable functional groups in a molecule, and (meth) acryl-modified chlorinated polyolefin,
In the coating film, the (meth) acryl-modified chlorinated polyolefin has a mass (Ma) of the polyfunctional (meth) acrylate polymer and a mass (Mb) of the (meth) acryl-modified chlorinated polyolefin. A coated part for home appliance, wherein a mass percentage (100 Mb / (Ma + Mb)) of mass (Mb) is 40% or more and 60% or less. The coating film further contains a pigment,
The ratio of the mass (Mc) of the pigment to the total amount of the mass (Ma) of the polyfunctional (meth) acrylate polymer and the mass (Mb) of the (meth) acryl-modified chlorinated polyolefin in the coating film ( 100Mc / (Ma + Mb)) is state, and are 50 or less,
The surface of the pigment particles is coated with organic molecules,
The said organic molecule is chemically couple | bonded with the polymer of the said polyfunctional (meth) acrylate, The coating component for household appliances of Claim 1 characterized by the above-mentioned. A polyfunctional (meth) acrylate consisting only of those having three or more crosslinkable functional groups in one molecule;
(Meth) acryl-modified chlorinated polyolefin,
A polymerization initiator for initiating a polymerization reaction of the polyfunctional (meth) acrylate;
A paint for a resin molded body comprising:
The blending amount of the (meth) acryl-modified chlorinated polyolefin is 40 parts by mass or more and 60 parts by mass or less with respect to 100 parts by mass of the total amount of the polyfunctional (meth) acrylate and the (meth) acryl-modified chlorinated polyolefin. The paint characterized by being. Further comprising a pigment,
The amount of the pigment is, relative to the polyfunctional (meth) acrylate and the (meth) per 100 parts by weight of the amount of acrylic-modified chlorinated polyolefin state, and are more than 50 parts by weight,
4. The paint according to claim 3 , wherein the surface of the pigment particle is coated with an organic molecule having a crosslinkable functional group that polymerizes with the crosslinkable functional group of the polyfunctional (meth) acrylate . A resin base material;
A coating film formed on the surface of the substrate;
Home appliances using paint parts for home appliances having
The coating film includes a polyfunctional (meth) acrylate polymer consisting only of those having three or more crosslinkable functional groups in a molecule, and (meth) acryl-modified chlorinated polyolefin,
In the coating film, the (meth) acryl-modified chlorinated polyolefin has a mass (Ma) of the polyfunctional (meth) acrylate polymer and a mass (Mb) of the (meth) acryl-modified chlorinated polyolefin. A home appliance having a mass percentage of mass (Mb) (100 Mb / (Ma + Mb)) of 40% or more and 60% or less. The household electrical appliance according to claim 5 , which is a washing / drying machine, a washing machine, or a drying machine.

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