JPH069808A - Coated foam - Google Patents

Abstract

PURPOSE:To obtain a coated foam having beautiful color by applying a coating material to a vinylidene chloride based resin foam. CONSTITUTION:A coating material selected from amount cellulose, polyurethane, acrylic, epoxy and polyester bases is directly applied to a vinylidene chloride based resin foam molded in an objective shape by a mold foaming method using spray or brush and dried to provide the objective coated form having beautiful color. This foam is directly used for various uses or assembled as each component.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a vinylidene chloride resin foam whose surface is coated with a paint. This coated foam can be used in the building materials field as an interior material, an exterior material, a floor material, a bathroom unit material, a wall sound absorbing material and a sound insulating material. In addition, the foam coated with a paint having a function can be used as a drain pan of an air conditioner, an electromagnetic shield material for electronics-related equipment or OA equipment, and an antistatic material. In addition, it can be used as a heat insulating material for cooler boxes, cushioning material for helmets, alternative materials such as lacquer ware, daily sundries, and hobbies.

[0002]

2. Description of the Related Art Styrofoam (hereinafter abbreviated as EPS) has been known as a typical foam, but it is difficult to select a solvent when EPS is colored and coated due to poor chemical resistance. Could not be used. Further, when using a water-based paint, it is necessary to modify the surface in order to make the surface easily wet, which is not practical. Therefore, in order to color the foam, a method in which a pigment is mixed with beads in advance, the granules are granulated, and then the foam molding is performed has been used.

[0003]

However, foamed molding of colored beads does not give a beautiful color, and it is impossible to display characters and pictures, which is not satisfactory. There has been a demand for a foam material having excellent chemical resistance that can be directly coated with a solvent-based paint in order to achieve a beautiful painting.

[0004]

In order to solve the above problems, a paintable vinylidene chloride resin foam is adopted. Since this vinylidene chloride-based foam has excellent chemical resistance, it is easy to select a coating material and an inexpensive one can be used. The vinylidene chloride-based resin foam refers to a foamed molded product obtained by pre-foaming beads obtained by impregnating an amorphous vinylidene chloride copolymer with a foaming agent and then performing in-mold molding.

The amorphous vinylidene chloride copolymer is a copolymer composed of 30% by weight or more and 85% by weight or less of vinylidene chloride and 15% by weight or more and 70% by weight or less of a copolymerizable monomer. . If the vinylidene chloride content is less than 30% by weight, the chemical resistance is lowered. If it exceeds 85% by weight, the vinylidene chloride copolymer becomes crystalline and the foamability is lowered.

The copolymerizable monomers include vinyl chloride, (meth) acrylonitrile, styrene, α-methylstyrene, and acrylic acid esters such as methyl acrylate, methacrylic acid esters such as methyl methacrylate, and N-phenylmaleimide. Such as N-
Substituted maleimide and the like can be mentioned. You may use these individually or in combination of 2 or more types.

The vinylidene chloride copolymer may have a crosslinked structure. The crosslinked structure makes the foam rich in closed cells and improves the foam moldability. Examples of the crosslinking agent include divinylbenzene, neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, ethylene glycol di (meth) acrylate, and propylene glycol di (meth) acrylate. You can

As the polymerization method, any known method can be used, for example, suspension polymerization, emulsion polymerization, solution polymerization, bulk polymerization and the like. A known radical initiator can be used as the polymerization initiator. Examples of the foaming agent include aliphatic hydrocarbons such as propane, butane, isobutane and pentane, chlorinated hydrocarbons such as methyl chloride, ethyl chloride and methylene chloride, monochlorodifluoroethane, trifluoroethane, difluoroethane, dichlorotrifluoroethane. , 1,1-dichloro-1 fluoroethane, 2,2-dichloro-1,1,1 trifluoroethane,
Fluorinated hydrocarbons such as 1,1,1,2-tetrafluoroethane and mixtures thereof can be used.

The above-mentioned vinylidene chloride foams are disclosed, for example, in Japanese Patent Publication No. 63-33781 and Japanese Patent Publication No. 63-33.
782, JP-A-63-170435 and Japanese Patent Application No. 2-199125. A known in-mold foam molding method may be used as a method for obtaining the foam molded article. First, resin particles containing a foaming agent are pre-expanded by heating with a heating medium such as steam, hot water, or hot air to obtain multifoam expanded particles. The heating conditions are selected according to the target expansion ratio. Next, a foamed molded article is obtained by filling the foamed expanded particles in a mold according to the purpose and heating with steam or the like. Since it is an in-mold molding method, it is possible to manufacture a molded body having a very complicated portion.

As the coating material, solvent evaporation type cellulose lacquer, vinyl lacquer, acrylic lacquer and the like can be used. The solvent to be used may be a general thinner. As self-reactive curing type, polyurethane type, epoxy type, unsaturated polyester type epoxy type,
Lacquer system etc. can be used. A general thinner may be used as a diluting solvent to be used. A photo-curing type paint can also be used. In addition, in order to add functionality to the above paint, it is also possible to apply special paints containing various additives,
In that case, a function can be further added to the foam.
For example, when a paint mixed with a metal filler such as carbon black, copper, tin oxide, etc. is applied to a foamed body, it is possible to prevent static electricity and have an electromagnetic shield effect. It is effective as a material.

The thermal conductivity of this vinylidene chloride resin foam is 0.019 kcal / m · h · ° C. if monochlorodifluoroethane is used as a foaming agent and the molding density is adjusted to 40 kg / m ^3. A molded product having a value of 0 ° C.) is formed. Therefore, it becomes a coating foam having excellent heat insulating properties and can be used as a heat insulating material. Further, this foam is excellent in water vapor transmission rate and water absorption rate, and by the joint effect with the applied coating film, it becomes a foam molded article which is extremely excellent in waterproofing and water blocking. From these effects, interior materials for building materials, exterior materials, floor materials,
It is effective for building materials such as bathroom units and wall materials. Further, it can also be applied to a drain pan of an air conditioner or the like as an application of waterproofing and water blocking effects. Generally, as a water stop method for drain pans,
Although moldings and sheets of synthetic resin such as ABS, PP, HIPS, and PVC are stuck together, molding cost is required. When the coated foam of the present invention is used, not only the molding cost can be greatly reduced, but also the molded foam can be applied to a part which cannot be stuck to the above resin due to a complicated molded body. Further, since the coating foam of the present invention uses a vinylidene chloride resin foam, there are few restrictions on the adhesive, so it is possible to assemble the molding beforehand with the adhesive and to coat it, so it is very applicable. Cheap.

As described above, the coating foam of the present invention has a very wide range of application. Therefore, it is not limited to the use described above.

[0013]

EXAMPLES The coating foam of the present invention will be specifically described below.

[0014]

Example 1 As a paint, a mixture of a polyurethane paint and a curing agent was used as a standard thinner (xylene / methyl isobutyl ketone / cellosolve acetate = 70% / 20% / 10).
%) And then applied to the surface of the vinylidene chloride resin foam with a spray gun. The vinylidene chloride-based foam used was 50 parts by weight of amorphous vinylidene chloride and 20 parts of acrylonitrile, which showed no substantial melting peak by a differential scanning calorimeter.
Parts, 30 parts of styrene, and 0.05 parts of divinylbenzene are resin molded particles obtained by in-mold foaming with a foaming agent of monochlorodifluoroethane. After drying at room temperature,
Observation of the coated surface revealed a beautiful coating.

[0015]

[Example 2] Acrylic paint as a paint was diluted with a standard thinner and then applied on the surface of vinylidene chloride resin foam with a spray gun. After drying at room temperature, the coated surface was observed and it was a beautiful coating.

[0016]

Example 3 An unsaturated polyester paint and a curing agent (organic peroxide / cobalt catalyst) were mixed as a paint, and the surface of a vinylidene chloride resin foam was applied by brushing. After reacting and curing at room temperature, the surface of the coating was observed and it was a beautiful coating.

[0017]

Example 4 A water-based acrylic paint was applied as a paint on the surface of a vinylidene chloride resin foam by a spray gun. After drying at room temperature, the coated surface was observed and it was a beautiful coating. Moreover, the coating film was not peeled off by the cellophane tape.

[0018]

[Example 5] A drain pan for an air conditioner formed of a vinylidene chloride-based resin foam was diluted with a mixture of a polyurethane coating and a curing material with a thinner, and was applied on the surface of the drain pan by spraying. It has become extremely waterproof.

[0019]

COMPARATIVE EXAMPLE 1 As in Example 1, a mixture of a polyurethane paint and a curing agent was diluted with a standard thinner and then applied on the surface of a polystyrene foam with a spray gun. At the same time as painting, the foam began to melt, and the shape of the molded body could not be retained, and painting could not be done.

[0020]

Comparative Example 2 A water-based acrylic paint was applied to the surface of polystyrene foam with a spray gun in the same manner as in Example 2.
After drying at room temperature, the coated surface was observed and it was found to be coated. When the adhesiveness of the coated surface was checked with cellophane tape, all the paint came off.

[0021]

INDUSTRIAL APPLICABILITY According to the present invention, a vinylidene chloride resin foam capable of in-mold molding and excellent in chemical resistance is directly coated with a coating material such as a cellulose-based, polyurethane-based, acrylic-based, epoxy-based or polyester-based paint. It is possible to provide a painted foam having a beautiful color, and it can be used as an interior material, an exterior material of a building, a building material such as a bathroom, a drain pan of an air conditioner, or the like. Moreover, since the vinylidene chloride resin foam has a low thermal conductivity, it can be used as a heat insulating material and as a cushioning material because of its high cushioning property. It can also be used as various industrial materials by combining it with a coating material having functionality.

Claims (1)

[Claims] 1. A coating foam comprising a vinylidene chloride resin foam whose surface is coated with a paint.