KR20150124598A - Synthetic resin composition of metal texture comprising polymer beads filled with metal pigments - Google Patents

Abstract

The present invention relates to a synthetic resin composition having metal texture comprising polymer beads containing metal pigments having metal texture in beads. A molded product using the synthetic resin composition according to the present invention can remove a weld line and has an outstanding exterior.

Description

Technical Field [0001] The present invention relates to a synthetic resin composition containing metal beads filled with metal pigments,

TECHNICAL FIELD The present invention relates to a synthetic resin composition having a metal texture, and more particularly, to a synthetic resin composition having a metal texture by adding a polymer bead containing metal pigments capable of exhibiting metal texture, thereby improving the metal texture of the appearance of the molded article and satisfying both workability and physical properties. To a synthetic resin composition.

BACKGROUND ART [0002] Conventionally, various methods have been used to impart a metal texture to a molded product made of synthetic resin. In order to impart the metal texture, a method of inserting metal films previously prepared in the process of extrusion or injection, a method of plating a molded article using chromium or nickel, a painting method using paint mixed with a metallic pigment and a volatile organic solvent, and the like Various methods have been tried. However, these methods have a problem in that the manufacturing process is complicated or difficult to be recycled as a resin in the process of disposing these plastic molded articles after use.

In order to solve these problems, a method of adding metal powder and flake as the concept of pigment has been used. For example, in Korea, Korean Patent Laid-Open Publication No. 10-2004-0048550 discloses a method for producing a wire-protecting cover having a metallic color by adding a metallic powder (silver powder or gold powder) to a polyvinyl chloride resin at a predetermined ratio, . However, there is a problem in that the metal pigments added as a method for imparting the metal texture can not be arranged in a certain direction, and in particular, the molten resin is vertically arranged at a portion where the flows meet with each other in a thin cavity to cause a weld- There is a problem that it causes appearance failure.

As one of efforts to solve such a problem, an attempt was made to improve the fluidity of the resin composition by mixing spherical glass particles to improve appearance defects. Specifically, in Korean Patent Laid-Open No. 10-2011-0008598, a spherical glass material is added together with a platelet-shaped metal pigment and an ultrafine long fibrous substance, and in Korean Patent Laid-open No. 10-2011-0017086, a metal pigment and a glass hollow fine particle are added And to solve the problem of poor appearance due to fluidity improvement and strength reduction in the vicinity of the weld line.

However, even when the spherical glass microparticles are added, the size of the molded product is increased or the shape of the molded product is complicated because the shape of the metal pigment showing the texture of the metal is in the form of a powder or a plate, And it is difficult to avoid problems such as a drop in impact due to the internal stress of a molded product due to a decrease in fluidity in the process of extrusion or injection due to the inclusion of various additives In addition, use of an inorganic glass product as an additive has a disadvantage in that a process for compatibilizing the organic material with the resin is required for completing the manufacturing process.

The present invention provides a synthetic resin composition which is capable of producing a molded article having excellent appearance that does not have appearance of metal unevenness due to flow fusion lines and flow marks while exhibiting a metallic texture.

Another object of the present invention is to provide a synthetic resin composition for a molded article of a metal texture which can satisfy both appearance, workability and physical properties required for a resin having a metal texture, and in particular, improved weld line of a molded article.

In order to attain the above object, the present invention provides a synthetic resin composition comprising 100 parts by weight of a thermoplastic resin and 1 to 50 parts by weight of a polymer bead in which a metal pigment is dispersed.

The average particle diameter of the polymer beads in which the metal pigment is dispersed may be 50 to 500 탆.

The material of the polymer beads may be polystyrene (PS), polymethylmethacrylate (PMMA) or acrylonitrile styrene resin (SAN).

The material of the polymer beads may be a thermosetting polymer.

The metal pigment may be in the form of a plate, an average particle size of 1 to 100 μm, and 0.5 to 30 parts by weight per 100 parts by weight of the polymer beads.

The thermoplastic resin may be at least one selected from the group consisting of a polypropylene resin, a polycarbonate resin, a polyethylene terephthalate resin, a polyethylene resin, an acrylonitrile butadiene styrene resin, a methyl methacrylate resin, a polyethylene ether ketone resin, a polyarylate resin, a methyl methacrylate butadiene styrene resin , An acrylonitrile styrene resin, a styrene resin, an ethylene propylene diene monomer (EPDM) resin, a nylon resin, an acetal resin, a melamine resin and an epoxy resin.

The metal pigment may be one or more selected from the group consisting of gold, silver, copper, nickel, titanium, tin, zinc, stainless steel, aluminum and alloys thereof.

The molded product obtained by extrusion and injection by using the synthetic resin composition of metal texture according to the present invention improves flowability and eliminates defects on the surface such as a weld line, thereby having an appearance of excellent quality, Process can be implemented. As a result, it is possible not only to produce a molded article of metal texture which can reduce cost, but also to make it possible to recycle the resin.

Fig. 1 schematically shows a structure in which a metal pigment is filled in a polymer bead.
2 is a conceptual view showing the arrangement of metal pigments in a conventional metal-made synthetic resin molded article.
3 is a conceptual view showing the arrangement of metal pigments in a metal-made synthetic resin molded article according to the present invention.
4 is a photograph of an aluminum flake used as a metal pigment in Example 1. Fig.
5 is a photograph of a bead containing an aluminum flake used in Example 1. Fig.
Fig. 6 is an external view of a metal textured molded article according to Example 1. Fig.
7 is an external view of a metal textured molded article according to Comparative Example 1. Fig.

Hereinafter, the present invention will be described in more detail.

The present invention provides a synthetic resin composition capable of producing a molded article having a metallic texture, wherein the synthetic resin composition according to the present invention comprises a thermoplastic resin and a polymer bead containing a metal pigment.

The synthetic resin contained in the synthetic resin composition according to the present invention refers to general thermoplastic synthetic resin, and is not particularly limited as long as it can be molded by extrusion or injection molding. But are not limited to, polypropylene resin, polycarbonate resin, polyethylene terephthalate resin, polyethylene resin, acrylonitrile butadiene styrene resin, methyl methacrylate resin, polyethylene ether ketone resin, polyarylate resin, methyl methacrylate butadiene styrene resin, Nitrile styrene resin, styrene resin, EPDM resin, nylon resin, acetal resin melamine resin, and epoxy resin.

The metallic pigments used in the present invention are not particularly limited, but may be one or two selected from the group consisting of gold, silver, copper, nickel, titanium, tin, zinc, stainless steel, aluminum, Or more.

The metal pigment used in the present invention is preferably in the form of a plate (or flake), and the particle size is preferably 1 to 100 mu m. If the particle diameter is less than the above-mentioned range, the specific shine of the metal pigment disappears. If the particle size is large, the size of the particles may become too large in the process of polymerizing the polymer beads, and the quality of the metal texture may disappear.

In the polymer beads mixed with the metal pigment used in the present invention, since the metal pigment must be contained in the polymer bead, the monomer and the metal pigment, which are the main materials, are simultaneously mixed in the polymerization reaction for forming the polymer beads, Thereby proceeding the radical polymerization reaction.

The content of the metal pigment is preferably 0.5 to 30 parts by weight per 100 parts by weight of the polymer beads.

The polymer bead is preferably made of polystyrene (PS), polymethyl methacrylate (PMMA), or acrylonitrile styrene resin (SAN), which is a copolymer material. The polymer beads used in the present invention are preferably emulsion polymerization, , Suspension polymerization, and the like, may be used without limitation.

The size of the prepared polymer beads is preferably 50 to 500 mu m. If the amount is less than the above-mentioned range, the metallic pigment is not sufficiently contained in the bead, and the workability is lowered. If the particles of the polymer beads are too large, the effect of the metal texture will deteriorate.

Metallic pigments representing metal texture are in the form of flakes. This shape can interfere with the flow of fluid during extrusion or extrusion and can cause the texture of the metal to drop significantly due to orientation at the point where the end of the fluid meets in the cavity at the time of injection, . In order to solve this problem, the present invention uses a method of filling the metal pigment into the polymer bead. Platelet-like metal particles filled in the polymer and polymerized are randomly oriented.

The polymer beads may be prepared by injecting the crosslinking agent to a certain extent during the polymerization. The thermoplastic resin is in a molten state at the time of extrusion or extrusion, but the polymer bead is required to maintain a solid state, so that the glass transition temperature or melting point is higher than that of the thermoplastic resin, or it can be made of a thermosetting resin material. By doing so, it is possible to keep the plate-like metal pigment impregnated in the polymer beads at the time of extrusion or injection at a random orientation in the polymerization reaction. Even though the metal-containing polymer beads rotate under the force in the cavity, the plate-shaped metal pigments randomly oriented in the solid beads are seen to have no change when viewed from the outside. This results in that it can be suppressed in a portion where defects are likely to occur in the appearance such as a weld line.

Further, in order to reduce appearance defects, metal pigments must be evenly dispersed in the molded article. 2 is a conceptual view showing the arrangement of metal pigments in a conventional metal-made synthetic resin molded article. In the case of conventional metal pigments, since each powder or plate flake must be dispersed in the resin, each particle receives resistance during flow. It acts to increase the viscosity at the time of molding and is seriously influenced by the distribution and orientation of the metal particles according to the stress that is received at the time of molding. In the case where a metal texture is exhibited by a metal pigment, the distribution and orientation of the metal particles have an absolute influence on the appearance quality.

3 is a conceptual view showing the arrangement of metal pigments in a metal-made synthetic resin molded article according to the present invention. The polymer beads containing metal pigments according to the present invention are advantageous in that they are less resistant due to the movement of several metal pigments in the solid phase of the polymer beads together during the molding process and that the polymer beads are spherical particles, have. The metal texture of the molded product is characterized by the use of polymeric beads with metal pigments, which are designed to exhibit a metallic texture in accordance with the direction in which the light incident from the outside is reflected and have excellent dispersibility and can not feel the change in orientation depending on the viewing position A molded article of a metal texture can be produced.

 In the present invention, it is preferable that 1 to 50 parts by weight of polymer beads filled with the metal pigment contained in the synthetic resin composition are included in 100 parts by weight of the synthetic resin. If it is contained below the above-mentioned range, the appearance of the metal texture is difficult. And if it exceeds the above-mentioned range, the physical properties such as mechanical strength are deteriorated.

The synthetic resin composition of the present invention can be used when a metal texture is required, and it can be used for automobile interior and exterior materials, household appliances, and plastic molded articles of daily necessities.

The following examples are provided to illustrate the present invention but are not to be construed as limiting the scope of the present invention.

[Example]

Example 1

In a jacketed reactor equipped with a stirrer, 100 g of styrene, 5.0 g of divinylbenzene, 20 g of a platinum aluminum metal pigment (see Fig. 4) having an average particle diameter of 30 m, 4 g of 2,2-azobisisobutyronitrile, 5 g of money, and 500 g of distilled water (first composition) were added, and the reaction was allowed to proceed at 65 ° C. After the reaction was completed for 12 hours, the polymer beads (see FIG. 5) containing metal pigment were prepared in the beads after completion of the reaction. As shown in Fig. 5, since the material of the bead including the metal pigment is transparent polystyrene, the metallic pigment component in the inside can be seen from the outside, and the light incident on the microscope is reflected for photographing, And it can be confirmed that it is fully exercised.

5 parts by weight of the polymer beads containing the metal pigment thus prepared were mixed with 100 parts by weight of acrylonitrile butadiene styrene resin to obtain a metal texture synthetic resin composition. In the color specimen mold designed to show the weld line well, injection molding Respectively.

Comparative Example 1

The same metal plate as that used in Example 1 was prepared, and 2.5 parts by weight of the metal pigment was mixed with 100 parts by weight of acrylonitrile butadiene styrene resin to obtain a metal texture synthetic resin composition. Injection molding was performed on the color specimen mold.

The compositions prepared in Example 1 and Comparative Example 1 were each prepared by injection molding in an injection molding machine (see FIGS. 6 and 7). The difference between the examples and the comparative examples can be clearly seen by looking at the weld line part of the prepared specimen. As shown in FIG. 7, it was confirmed that the weld line was clearly observed in the specimen prepared by directly adding the metal pigment, but in the specimen prepared using the polymer bead containing the metal pigment prepared in Example 1 It can be seen from FIG. 6 that the weld line trace is remarkably reduced.

Claims (7)

100 parts by weight of a thermoplastic resin,
And 1 to 50 parts by weight of a polymer bead having a metal pigment dispersed therein. The method according to claim 1,
Wherein the average particle diameter of the polymer beads in which the metal pigment is dispersed is 50 to 500 占 퐉. The method according to claim 1,
Wherein the material of the polymer beads is polystyrene (PS), polymethyl methacrylate (PMMA), or acrylonitrile styrene resin (SAN). The method according to claim 1,
Wherein the polymer of the polymer bead is a thermosetting resin. The method according to claim 1,
Wherein the metal pigment is in the form of a plate, the average particle size is 1 to 100 mu m, and 0.5 to 30 parts by weight per 100 parts by weight of the polymer beads. The method according to claim 1,
The thermoplastic resin may be at least one selected from the group consisting of a polypropylene resin, a polycarbonate resin, a polyethylene terephthalate resin, a polyethylene resin, an acrylonitrile butadiene styrene resin, a methyl methacrylate resin, a polyethylene ether ketone resin, a polyarylate resin, a methyl methacrylate butadiene styrene resin , An acrylonitrile styrene resin, a styrene resin, an EPDM resin, a nylon resin, an acetal resin, a melamine resin and an epoxy resin. The synthetic resin composition according to claim 1, wherein the metal pigment is at least one selected from the group consisting of gold, silver, copper, nickel, titanium, tin, zinc, stainless steel, aluminum and alloys thereof.

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