KR102305165B1 - Thermoplastic resin composition of metal-like texture having good chemical resistance and molded article comprising the same - Google Patents

Abstract

The present invention relates to a thermoplastic resin composition having excellent chemical resistance and a metallic texture and a molded article comprising the same, and more particularly, to a thermoplastic resin, a crystalline polyalkylene resin of a specific content and metal particles of a specific content are applied Accordingly, it relates to a thermoplastic resin composition and a molded article comprising the same, which exhibits excellent chemical resistance, particularly chemical resistance to sunscreen, metal texture, and excellent balance of physical properties such as impact strength.

Description

A thermoplastic resin composition having excellent chemical resistance and a metallic texture, and a molded article comprising the same

The present invention relates to a thermoplastic resin composition having excellent chemical resistance and a metallic texture and a molded article comprising the same, and more particularly, to a thermoplastic resin, a crystalline polyalkylene resin of a specific content and metal particles of a specific content are applied Accordingly, it relates to a thermoplastic resin composition and a molded article comprising the same, which exhibits excellent chemical resistance, particularly chemical resistance to sunscreen, metal texture, and excellent balance of physical properties such as impact strength.

In recent market trends, one of the main determinants that stimulates consumers' purchase desire is human emotional stimulation. Accordingly, there is an increasing interest in plastics that realize a beautiful appearance that can stimulate human emotions in addition to improving the physical properties of plastics used in electronic and electrical products and materials for interior and exterior of automobiles. In line with this market trend, products that affect the emotional design of buyers, such as design, touch, and UI (User Interface), are being launched.

In the case of plastic, it stimulates human emotions, such as a metal-like material that gives a luxurious image to people, and a fabric-like material that gives a comfortable and warm feeling. A variety of materials are being developed for this purpose. Among them, a metal texture material, which is widely used in electrical, electronic products, and home appliance parts, is plastic, but has the color and luminance of metal. Therefore, since the plastic itself embodies a metallic feel and gives a luxurious sensibility, a separate painting or painting process is unnecessary during the process, and the process can be simplified, resulting in time and cost savings. In addition, when a metal texture material is applied to a product, it is environmentally friendly because the environmentally harmful painting, painting, spray method, and thermal evaporation method, which were previously performed to give a metallic feel to plastic, are unnecessary. Therefore, there is a continuous demand for a material capable of realizing a metallic feel with only the thermoplastic resin itself.

However, in the case of a plastic material that realizes the existing metal-like feeling, it contains metal particles, and due to the unique properties of these metal particles, weld lines occur depending on the mold design, flow marks occur, and contact with chemical products. There is a problem with chemical resistance, such as cracking.

In particular, the most vulnerable problem of thermoplastic resins such as ABS and PC, which are commonly used in electrical and electronic products and automobile interior materials, is chemical resistance. Since these products actually come into contact with human hands, they need to have chemical resistance to chemicals used in cosmetics and the like. Among chemical products, there is an urgent need to improve the chemical resistance of sunscreens. Among the thermoplastic resin compositions having chemical resistance to general chemicals, most cases do not pass the sunscreen chemical resistance test.

Therefore, it is necessary to develop a thermoplastic resin composition that can solve these problems, maintain the original properties of the thermoplastic resin, have excellent chemical resistance, and realize a metallic texture.

It is an object of the present invention to provide a thermoplastic resin composition that has excellent chemical resistance and a metallic feel while maintaining the original physical properties of the thermoplastic resin, and a molded article including the same.

In order to solve the above technical problem, the present invention includes (A) a thermoplastic resin, (B) a crystalline polyalkylene resin, and (C) metal particles, and the components (A), (B) and (C) Based on 100 parts by weight in total, the content of the component (B) is 10 to 38 parts by weight, and the content of the component (C) is 1.5 to 4.5 parts by weight, to provide a thermoplastic resin composition.

According to another aspect of the present invention, there is provided a molded article including the thermoplastic resin composition of the present invention.

The thermoplastic resin composition according to the present invention has excellent chemical resistance and, at the same time, excellent mechanical properties, and is economical and environmentally friendly because it does not perform a post-processing painting process by implementing a metal texture. Therefore, it can be usefully applied to various electrical and electronic products such as a mobile phone housing, a TV housing, a refrigerator housing, a copier, a printer, and the like, and home appliances that require both metal texture and excellent chemical resistance.

1 is a photograph showing the flop index measured for each surface having various metal textures so as to check the metal texture difference according to the flop index value.
2 is a photograph of external surfaces of chemical resistance test specimens in Examples and Comparative Examples of the present invention.

Hereinafter, the present invention will be described in detail.

The thermoplastic resin composition of the present invention includes (A) a thermoplastic resin, (B) a crystalline polyalkylene resin, and (C) metal particles.

(A) Thermoplastic resin

As the thermoplastic resin component included in the thermoplastic resin composition of the present invention, it can be used without limitation as long as it is applicable as an unpainted metallic material.

The thermoplastic resin component is, for example, polycarbonate (PC) resin, acrylonitrile-butadiene-styrene (ABS) resin, polyamide (PA) resin, modified acrylonitrile-butadiene-styrene (mABS) resin, polyethylene and polyolefin resins such as polypropylene, polyether ether ketone (PEEK) resin, polyphenylene sulfide (PPS) resin, modified polyphenylene ether (mPPE) resin, polymethyl methacrylate (PMMA) resin, polybutylene tere. It may be selected from a phthalate (PBT) resin, and a mixture of two or more thereof, and more specifically, but is not particularly limited thereto.

According to one embodiment of the present invention, the thermoplastic resin component includes acrylonitrile-butadiene-styrene (ABS) resin, polymethyl methacrylate (PMMA) resin, polycarbonate (PC) resin, and at least two of them. One selected from mixtures may be used.

In one embodiment, the thermoplastic resin composition of the present invention may include the thermoplastic resin component in an amount of 60 parts by weight to 88 parts by weight based on 100 parts by weight of the total of the components (A), (B) and (C). . When the content of the thermoplastic resin component in the resin composition is too less than the above level, it is difficult to maintain the original physical properties of the thermoplastic resin composition, such as lowering the impact strength.

More specifically, the content of the thermoplastic resin component based on 100 parts by weight of the total of the components (A), (B) and (C) in the thermoplastic resin composition of the present invention is 61 parts by weight or more, 63 parts by weight or more, or 65 parts by weight. part or more, and may be 85 parts by weight or less, 83 parts by weight or less, or 80 parts by weight or less.

(B) crystallinity polyalkylene profit

The crystalline polyalkylene resin included in the thermoplastic resin composition of the present invention may be, for example, polypropylene, and more specifically, may be homopolypropylene.

Polypropylene can reduce the cycle time during injection due to its fast crystallinity, and has excellent appearance, shrinkage, and dimensional stability of the injected product.

The thermoplastic resin composition of the present invention contains the crystalline polyalkylene resin component in an amount of 10 to 38 parts by weight based on 100 parts by weight of the total of the components (A), (B) and (C). If the content of the crystalline polyalkylene resin component in the resin composition is less than 10 parts by weight based on 100 parts by weight of the total of (A), (B) and (C) components, there is a problem in that chemical resistance is lowered, and when it exceeds 38 parts by weight, There is a problem in that the impact strength is lowered.

More specifically, the content of the crystalline polyalkylene resin component based on 100 parts by weight of the total of the components (A), (B) and (C) in the thermoplastic resin composition of the present invention is 12 parts by weight or more, 15 parts by weight or more or 18 parts by weight or more, and may also be 35 parts by weight or less, 33 parts by weight or less, or 30 parts by weight or less.

(C) metal particles

The material of the metal particle component included in the thermoplastic resin composition of the present invention is not particularly limited, and the material of the metal particle may be selected according to a metallic appearance required for a molded article to which the thermoplastic resin composition of the present invention is applied.

In one embodiment, the metal particle component may be any metal or an alloy of any two or more metals, and more specifically, may be aluminum or an aluminum-based alloy, but is not limited thereto. In addition, the surface of the metal particles may be coated or surface-treated.

In one embodiment, the metal particles may be plate-shaped or spherical particles or a mixture thereof, and more specifically, may be plate-shaped particles (metal flake).

In one embodiment, the average particle size of the metal particle component may be 5 to 100 μm, more specifically 10 to 60 μm, and even more specifically 20 to 40 μm. If the average particle size of the metal particle component is too small, it may be difficult to realize a desired level of metal feeling, and if it is too large, an undesired sparkling effect may appear.

In one embodiment, the thickness of the metal particle component may be 0.2 to 1.0 μm, more specifically 0.2 to 0.4 μm. Also, in one embodiment, the aspect ratio of the metal particle component may be 8 to 120.

The thermoplastic resin composition of the present invention includes the metal particle component in an amount of 1.5 to 4.5 parts by weight based on 100 parts by weight of the total of the components (A), (B) and (C). If the content of the metal particle component in the resin composition is less than 1.5 parts by weight based on 100 parts by weight of the total of (A), (B) and (C) components, it is difficult to implement a metallic appearance, and if it exceeds 4.5 parts by weight, chemical resistance deteriorates and impact strength There is a problem with the lower

More specifically, the content of the metal particle component based on 100 parts by weight of the total of the components (A), (B) and (C) in the thermoplastic resin composition of the present invention is 1.2 parts by weight or more, 1.5 parts by weight or more, or 1.8 parts by weight. part or more, and may be 4 parts by weight or less, 3.5 parts by weight or less, or 3 parts by weight or less.

The thermoplastic resin composition of the present invention may further include one or more other additives commonly added to the thermoplastic resin composition for injection molding or extrusion molding in addition to the above components. Such other additives include, for example, diffusing agents, antioxidants, lubricants, ultraviolet absorbers, light stabilizers, impact modifiers, matting agents, flame retardants, or mixtures of two or more thereof.

Although not limited thereto, for example, silicone-based, acrylic-based, PS-based, etc. may be used as the diffusion agent, and antioxidants such as phenol-based, phosphite-based, and thioester-based antioxidants may be used as the antioxidant. As the zero, a lubricant such as polyethylene-based, ethylene-ester-based, ethylene glycol-glycerin ester-based, montan-based, ethylene glycol-glycerin-montanic acid, ester-based lubricant may be used, and the light stabilizer includes a benzotriazole-based compound, hydride A hydroxyphenyltriazine-based compound, a pyrimidine-based compound, a cyanoacrylate-based compound, etc. may be used, and the impact modifier includes an acrylate-based copolymer, an ethylene-acrylate-based copolymer, a silicone-containing copolymer, and a polyalkyl meta A copolymer having one or more core-shell structures selected from acrylate-based copolymers and the like may be used. The impact modifier can perform a function of stabilizing excellent and uniform physical properties by reinforcing compatibility between resins or additional components as well as a function of reinforcing impact. In addition, as the flame retardant, a phosphate compound, a phosphite compound, a phosphonate compound, a polysiloxane, a phosphazene compound, a phosphinate compound, or a melamine compound may be used, and the matting agent may be an inorganic compound or an organic compound. The inorganic compound matting agent may be silica, magnesium oxide, zirconia, alumina or titania, and the organic compound matting agent is a crosslinked vinyl copolymer, and the monomer of the vinyl copolymer is styrene, acrylonitrile, methyl (meth ) may be one or more monomers selected from acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, and the like.

The composition of the present invention has excellent chemical resistance to chemicals, and excellent chemical resistance to alcohols, benzenes, and acetate-based compounds. For example, it has excellent chemical resistance to chemical components including butylene glycol, dipropylene glycol, tocopheryl acetate, ethyl parabenzene, and methyl parabenzene. Therefore, even when sunscreen is applied to the product made from the composition of the present invention, the original physical properties and appearance can be maintained without breaking or cracking.

The content of the other additives is not particularly limited, and is an amount that can be used to add additional functions within a range that does not impair the desired physical properties of the thermoplastic resin composition of the present invention.

According to one embodiment of the present invention, the content of the other additives may be 0.1 to 5 parts by weight based on 100 parts by weight of the total of the components (A), (B) and (C) in the resin composition, more specifically It may be 0.5 to 2 parts by weight. When the content of other additives is less than 0.1 parts by weight, the effect of improving various functions according to the use of other additives may be insignificant, and when the content of other additives is more than 5 parts by weight, mechanical properties may deteriorate.

When the thermoplastic resin composition of the present invention is used, a molded article made of a metallic material having excellent chemical resistance while exhibiting a metallic texture can be obtained.

In one embodiment, the thermoplastic resin composition of the present invention may exhibit chemical resistance to at least one of alcohols, benzenes, and acetate compounds.

In one embodiment, the thermoplastic resin composition of the present invention may exhibit chemical resistance to the composition for sunscreen.

In one embodiment, the thermoplastic resin composition of the present invention may have a flop index (Normal_Flop index) of 9 or more (eg, 9 to 15), and more specifically, 10 or more (eg, 10 to 15).

Accordingly, according to another aspect of the present invention, there is provided a molded article including the thermoplastic resin composition of the present invention.

The molded article may be manufactured by extruding or injection molding the thermoplastic resin composition of the present invention.

Hereinafter, the present invention will be described in more detail through Examples and Comparative Examples. However, the scope of the present invention is not limited thereto.

[ Example ]

Example 1-2 and comparative example 1-5

The components of the composition with the components and contents shown in Table 1 below are mixed with a mixer and uniformly dispersed, and then extruded in a twin-screw melt mixing extruder with L/D=40, Φ=25mm at a temperature of 210 to 250° C. to produce pellets After drying for 4 hours or more in a hot air dryer at 80 to 100 ° C, the specimen was injection molded at a temperature of 220 to 240 ° C.

For the thermoplastic resin compositions prepared in Examples and Comparative Examples, physical properties were measured and evaluated in the following manner, and the results are shown in Table 1 below.

[Measurement and evaluation of physical properties]

Chemical resistance (sunscreen)

After fixing the specimen using a jig of elongation (1.0%), a sunscreen chemical solvent was applied and left at room temperature (23° C.) for 168 hours. Chemical solvents were tested by two specimens per type, and test specimens were tested using ASTM D638 tensile specimens. Fracture When breakage occurred (X), when cracks occurred (Δ), when cracks and fractures did not occur (O) were indicated.

The sunscreen I used is ISA KNOX sunscreen, and the main ingredients are as follows:

Cyclopentasiloxane, purified water, zinc oxide, butylene glycol, ethylhexyl methoxycinnamate, titanium dioxide, PEG-10 dimethicone, dipropylene glycol, dimethicone, disteadimonium hectorite, hexyllaurate , Magnesium Sulfate, Panthenol, Machihun Extract, Fatty Acid Extract, Cetylethyl Hexanoate, Dimethicone/Matchcon Copolymer, Dimethicone/Vinyl Dimethicone Crosspolymer, Zinc Stearate, Dimethicone/PEG-10/15 Cross Polymer, acrylate/dimethicone copolymer, sorbitan sesquioleate, tocopheryl acetate, alanylglutamine, tahiti vanilla extract, dipotassium glycyrrhizate, saccharide isomerate, chamomile flower extract, caprylic/ Capric glyceride, chaparral extract, dandelion root extract, white lupine seed extract, cluster pine bark/bud extract, distearyldimonium chloride, VP.eicosene polymer, stearic acid, alumina, methicone, mica , Vinyl dimethicone/methicone silsesquickoxane crosspolymer, nylon-12, red iron oxide, yellow iron oxide, black iron oxide, triethoxycaprylyl silane, ethylparaben, methylparaben, fragrance, limonene

metal texture

The flop index was measured using a BYK-Mac I Spectrophotometer manufactured by BYK. Specifically, after measuring the luminance of the reflected light at angles of 15°, 45° and 110° with respect to the surface of the injection specimens prepared in Examples and Comparative Examples, the flop index is calculated by substituting into Equation 1 below. did.

[Equation 1]

Luminance of reflected light measured at an angle of L*15° = 15°

Luminance of reflected light measured at an angle of L*45° = 45°

Luminance of reflected light measured at an angle of L*115° = 115°

The flop index of the surface of an object without metal texture is 0, the flop index of the actual metal surface is 15 to 17, the flop index of the surface of the injection-molded article coated with the coating composition is 11 to 14, and you can feel the metal texture with the naked eye. The flop index of a possible surface is 6 or greater.

1 is a view showing a flop index measured for a surface having a metal texture, and the metal texture according to the flop index value can be confirmed.

impact strength ( Izod )

Impact strength (1/8" thick Izod Notched type) was measured according to ASTM D256 for the injection specimens prepared in Examples and Comparative Examples.

[Table 1]

As can be seen from the results of Table 1, the compositions of Examples according to the present invention have excellent chemical resistance, and at the same time implement an appearance showing an excellent metal texture, and maintain excellent mechanical properties. On the other hand, the compositions of Comparative Examples have low impact strength (Comparative Examples 1 and 4), poor chemical resistance (Comparative Examples 2, 4, 5), and low metal texture (Comparative Example 3), among the evaluated items. At least one was poor.

Claims (8)

(A) acrylonitrile-butadiene-styrene (ABS) resin;
(B) a crystalline polypropylene resin; and
(C) metal particles;
Based on 100 parts by weight of the total of the components (A), (B) and (C),
The content of the component (A) is 65 to 80 parts by weight,
The content of the component (B) is 18 to 33 parts by weight,
The content of the component (C) is 1.8 to 3 parts by weight,
Thermoplastic resin composition. The thermoplastic resin composition according to claim 1, wherein the metal particles are plate-shaped particles. The thermoplastic resin composition according to claim 1, which exhibits chemical resistance to at least one of alcohols, benzenes, and acetate compounds. The thermoplastic resin composition according to claim 1, which exhibits chemical resistance to the composition for UV protection. The thermoplastic resin composition of claim 1, wherein the flop index (Normal_Flop index) is 9 or more. A molded article comprising the thermoplastic resin composition of any one of claims 1 to 5. delete delete

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