JP2014091819A - Resin composition for injection molding, injection molding article, decorative component, and consumer electronics product using the same - Google Patents

Resin composition for injection molding, injection molding article, decorative component, and consumer electronics product using the same Download PDF

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JP2014091819A
JP2014091819A JP2012245029A JP2012245029A JP2014091819A JP 2014091819 A JP2014091819 A JP 2014091819A JP 2012245029 A JP2012245029 A JP 2012245029A JP 2012245029 A JP2012245029 A JP 2012245029A JP 2014091819 A JP2014091819 A JP 2014091819A
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injection molding
metal particles
scale
injection
resin composition
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Michihiro Shima
岐宏 島
Tomonao Amayoshi
智尚 天良
Akihiro Umeda
章広 梅田
Fumie Horihata
文枝 堀端
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Panasonic Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a resin composition for injection molding that can produce an injection molding article that includes a scale-like metal particle, in which poor appearance is not generated, and metallic feeling is possessed.SOLUTION: A resin composition for injection molding is that a thermoplastic resin is mixed with a scale-like metal particle, wherein the scale-like metal particle is that number standard particle size distribution measured by an image analysis method is that a number ratio of a particle of at most 5.9 μm is at least 75%, and inclusion is performed by a range of at least 2.0 pts.wt. and at most 4.0 pt.wt. based on 100 pts.wt. of a thermoplastic resin, thereby an injection molding article surface layer can be precisely concealed by the scale-like metal particle, and an injection molding article in which poor appearance is suppressed, and metallic feeling is possessed can be produced even for a resin molding article of a shape in which speed unevenness is partially generated in flow of a molten resin.

Description

この発明は、鱗片状金属粒子を含有する射出成型用樹脂組成物、該射出成形用樹脂組成物を用いた射出成形品、該射出成形品からなる加飾部品、及び該加飾部品を用いた家電製品に関する。   The present invention uses an injection molding resin composition containing scaly metal particles, an injection molded article using the injection molding resin composition, a decorative part made of the injection molded article, and the decorative part. Related to home appliances.

従来、特に自動車分野、家電分野等において、塗装によって熱可塑性樹脂成形品にメタリック感を付与し、加飾部品として用いてきた。しかし、近年、塗装工程において発生する揮発性有機溶剤を低減する気運が高まってきている。これに伴い、熱可塑性樹脂中にアルミニウム等の金属粒子を分散させて射出成型することにより、成形品にメタリック感を付与し、塗装工程を不要にする試みが行われている。   Conventionally, in the automobile field, the home appliance field, etc., a metallic feeling has been imparted to a thermoplastic resin molded product by painting, and it has been used as a decorative part. However, in recent years, there is an increasing tendency to reduce volatile organic solvents generated in the painting process. Along with this, attempts have been made to impart metallic feeling to a molded product and eliminate the need for a coating process by dispersing metal particles such as aluminum in a thermoplastic resin and performing injection molding.

しかしながら、熱可塑性樹脂中に金属粒子を分散させて射出成形する際、金型内において厚みの変化、孔やリブ等の存在などにより、溶融熱可塑性樹脂流れに速度ムラが発生する状態になると、金属粒子の配向状態が不均一となり、成形品表面において部分的に明度が異なるなど外観不良が生じる問題がある。   However, when metal particles are dispersed in a thermoplastic resin and injection molded, due to a change in thickness in the mold, presence of holes, ribs, and the like, when the speed of the molten thermoplastic resin becomes uneven, There is a problem in that the orientation state of the metal particles becomes non-uniform and appearance defects occur such that the brightness is partially different on the surface of the molded product.

この課題に対し、例えば特許文献1では、共重合体を有する樹脂材料を使用し、かつ分散する鱗片状の金属粒子の平均粒子径と添加量を調整することで、良好な光輝感を得ると共に、散乱光の干渉の抑制効果及び物性を得る手法が開示されている。   In response to this problem, for example, in Patent Document 1, a resin material having a copolymer is used, and by adjusting the average particle diameter and addition amount of the scale-like metal particles to be dispersed, a good glitter is obtained. A method for obtaining the effect of suppressing the interference of scattered light and the physical properties is disclosed.

特開2010−106201号公報JP 2010-106201 A

しかしながら、特許文献1の方法では、金属粒子の配向状態の不均一を充分に抑制することができず、外観不良の発生を抑制することが困難であった。   However, the method of Patent Document 1 cannot sufficiently suppress the nonuniformity of the orientation state of the metal particles, and it is difficult to suppress the occurrence of poor appearance.

前記従来の課題を解決するために、本発明の射出成形用樹脂組成物は、熱可塑性樹脂に鱗片状金属粒子を混合した射出成形用樹脂組成物であって、前記鱗片状金属粒子は、画像解析法により計測した個数基準粒度分布が5.9μm以下の粒子の個数割合を75%以上とし、かつ、熱可塑性樹脂100重量部に対して、2.0重量部以上、4.0重量部以下の範囲で含有している。   In order to solve the conventional problems, the resin composition for injection molding of the present invention is a resin composition for injection molding in which a scaly metal particle is mixed with a thermoplastic resin, and the scaly metal particle is an image. The number ratio of particles having a number-based particle size distribution of 5.9 μm or less measured by an analysis method is 75% or more, and is 2.0 parts by weight or more and 4.0 parts by weight or less with respect to 100 parts by weight of the thermoplastic resin. It is contained in the range.

鱗片状金属粒子を上記範囲に設定することにより、部分的に溶融樹脂の流れに速度ムラが発生する形状の樹脂成形品であっても、外観不良を抑制し、メタリック感を有する射出成形品を製造することができる。   By setting the scale-like metal particles in the above range, an injection molded product that suppresses the appearance defect and has a metallic feeling, even if the resin molded product has a shape in which velocity unevenness occurs partially in the flow of the molten resin. Can be manufactured.

本発明は、溶融樹脂の流れに速度ムラが発生する形状の樹脂成形品であっても、外観不良を抑制し、メタリック感を有する射出成形品を製造することができる。   Even if the present invention is a resin molded product having a shape in which velocity unevenness occurs in the flow of the molten resin, it is possible to manufacture an injection molded product that suppresses the appearance defect and has a metallic feeling.

射出成形品の断面図Cross section of injection molded product 本発明の実施の形態1における射出成形品を得るための工程図Process drawing for obtaining the injection-molded article in Embodiment 1 of the present invention 評価に用いた射出成形品の形状図Shape of injection molded product used for evaluation

第1の発明の射出成形用樹脂組成物は、熱可塑性樹脂に鱗片状金属粒子を混合した射出成形用樹脂組成物であって、前記鱗片状金属粒子は、画像解析法により計測した個数基準粒度分布が5.9μm以下の粒子の個数割合を75%以上とし、かつ、熱可塑性樹脂100重量部に対して、2.0重量部以上、4.0重量部以下の範囲で含有している。   The resin composition for injection molding of the first invention is a resin composition for injection molding in which a scaly metal particle is mixed with a thermoplastic resin, and the scaly metal particle has a number-based particle size measured by an image analysis method. The number ratio of particles having a distribution of 5.9 μm or less is 75% or more, and is contained in the range of 2.0 parts by weight or more and 4.0 parts by weight or less with respect to 100 parts by weight of the thermoplastic resin.

厚みが変化したり、孔やリブが形成されるなど、部分的に溶融樹脂の流れに速度ムラが発生する形状の樹脂成形品であっても、外観不良を抑制し、メタリック感を有する射出成形品を製造することができる。   Injection molding that suppresses appearance defects and has a metallic feel, even for resin molded products with shapes that cause uneven speed in the molten resin flow, such as thickness changes and holes and ribs formed Product can be manufactured.

第2の発明の射出成形用樹脂組成物は、第1の発明の射出成形用樹脂組成物において、鱗片状金属粒子を、熱可塑性樹脂100重量部に対して3.5重量部以上、4.0重量部以下の範囲で含有している。   3. The resin composition for injection molding of the second invention is the resin composition for injection molding of the first invention, wherein the scaly metal particles are 3.5 parts by weight or more with respect to 100 parts by weight of the thermoplastic resin. It is contained in the range of 0 part by weight or less.

第3の発明の射出成形用樹脂組成物は、第1の発明または第2の発明の射出成形用樹脂組成物において、画像解析法により計測した鱗片状金属粒子の長径基準形状係数が1.5以上、2.0以下であることを特徴とする。   The resin composition for injection molding according to the third aspect of the invention is the resin composition for injection molding according to the first aspect or the second aspect of the present invention, wherein the major axis shape factor of the scale-like metal particles measured by the image analysis method is 1.5. The above is 2.0 or less.

第4の発明の射出成形用樹脂組成物は、第3の発明の射出成形用樹脂組成物において、鱗片状金属粒子の長径基準形状係数が1.7以上、1.8以下であることを特徴とする。   The resin composition for injection molding according to a fourth aspect of the invention is the resin composition for injection molding according to the third aspect of the invention, wherein the scale-shaped metal particles have a major axis reference shape factor of 1.7 or more and 1.8 or less. And

第5の発明の射出成形品は、第1から第4の発明の射出成形用樹脂を用いたことを特徴とする。これにより、塗装同等の質感を有する射出成形品を得ることができる。   The injection molded product of the fifth invention is characterized by using the injection molding resin of the first to fourth inventions. Thereby, an injection molded product having a texture equivalent to that of paint can be obtained.

第6の発明の加飾部品は、第5の発明の射出成形品からなる。これにより、塗装同等の質感を有する加飾部品を得ることができる。   The decorative part of the sixth invention comprises the injection molded product of the fifth invention. Thereby, a decorative part having a texture equivalent to that of paint can be obtained.

第7の家電製品は、第6の発明の加飾部品を用いたことを特徴とする。これにより家電製品の外観品位向上を図ることができる。   The seventh home appliance is characterized by using the decorative part of the sixth invention. As a result, the appearance quality of home appliances can be improved.

以下、本発明の実施の形態について、図面を参照しながら説明する。なお、この実施の形態によって本発明が限定されるものではない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(実施の形態1)
まず、射出成形品の成形方法について説明する。
(Embodiment 1)
First, a method for molding an injection molded product will be described.

図1は、本発明の実施の形態1における射出成形品の断面図であり、図2は、射出成形品を得るための工程図である。   FIG. 1 is a sectional view of an injection molded product according to Embodiment 1 of the present invention, and FIG. 2 is a process diagram for obtaining an injection molded product.

図1において、射出成形品1は、少なくとも鱗片状金属粒子2を含有する熱可塑性樹脂3により成形されている。   In FIG. 1, an injection molded product 1 is molded from a thermoplastic resin 3 containing at least scale-like metal particles 2.

本実施の形態の射出成形品1の製造方法について図2を用いて説明する。   The manufacturing method of the injection molded product 1 of this Embodiment is demonstrated using FIG.

まず、材料の調整について説明する。   First, the material adjustment will be described.

熱可塑性樹脂3のペレットに、鱗片状金属粒子2を所定割合で混合してタンブルミキサ
ーに投入し、撹拌する。なお、このとき、ヘンシェルミキサー等の混合機を使用することもできる。また、必要に応じて他の添加剤(着色剤、滑剤等)を投入してもよい。また、熱可塑性樹脂3に鱗片状金属粒子2を混合機を用いて混合した後、後述する溶融・混練工程において、添加剤などの液体を直接添加する機能を有する押出機を用いて混合することもできる。
The scale-like metal particles 2 are mixed with the pellets of the thermoplastic resin 3 at a predetermined ratio, and the mixture is put into a tumble mixer and stirred. At this time, a mixer such as a Henschel mixer can also be used. Further, other additives (coloring agents, lubricants, etc.) may be added as necessary. In addition, after the scaly metal particles 2 are mixed with the thermoplastic resin 3 using a mixer, they are mixed using an extruder having a function of directly adding a liquid such as an additive in the melting / kneading step described later. You can also.

次に、熱可塑性樹脂3(鱗片状金属粒子2との混合材料)を押出機のホッパーに投入する。熱可塑性樹脂3はスクリューの溝に落ち、スクリューの回転により溶融・混練されながらノズル方向に移送される。ノズル方向に移送された熱可塑性樹脂3(鱗片状金属粒子2を含む)は、ノズルに取り付けられたダイから押し出される。ダイの孔から糸状に押し出された熱可塑性樹脂3は水槽で冷却され、冷却された熱可塑性樹脂3はペレタイザーによりペレットにカットされる。   Next, the thermoplastic resin 3 (mixed material with the scale-like metal particles 2) is put into a hopper of an extruder. The thermoplastic resin 3 falls into the groove of the screw and is transferred in the nozzle direction while being melted and kneaded by the rotation of the screw. The thermoplastic resin 3 (including the scaly metal particles 2) transferred in the nozzle direction is extruded from a die attached to the nozzle. The thermoplastic resin 3 extruded in a thread form from the hole of the die is cooled in a water tank, and the cooled thermoplastic resin 3 is cut into pellets by a pelletizer.

次に、射出成形について説明する。   Next, injection molding will be described.

乾燥させて水分を除去した熱可塑性樹脂3のペレットを射出成形機のホッパーに投入する。なお、このとき、熱可塑性樹脂が吸湿性の低い材料であれば、乾燥工程を省くことも可能である。   The pellets of the thermoplastic resin 3 that has been dried to remove moisture are put into a hopper of an injection molding machine. At this time, if the thermoplastic resin is a low hygroscopic material, the drying step can be omitted.

熱可塑性樹脂3は、射出成形機のシリンダー内でスクリューの回転により溶融・混練されながらノズル方向に移送される。金型を閉じた状態とし、熱可塑性樹脂3を金型のキャビティ内に射出する。熱可塑性樹脂3を金型のキャビティ内全体に充填し、金型を冷却して、熱可塑性樹脂3を固化し、金型を開いて、射出成形品1を取り出す。   The thermoplastic resin 3 is transferred in the nozzle direction while being melted and kneaded by rotation of a screw in a cylinder of an injection molding machine. The mold is closed, and the thermoplastic resin 3 is injected into the mold cavity. The entire inside of the mold cavity is filled with the thermoplastic resin 3, the mold is cooled, the thermoplastic resin 3 is solidified, the mold is opened, and the injection molded product 1 is taken out.

このとき、射出成形品1の表面に鱗片状金属粒子の配向状態ムラに起因した外観不良の発生を抑制できるよう、金型温度、シリンダー温度、射出速度、射出圧力、保圧時間、冷却時間等の各条件を、熱可塑性樹脂の種類、鱗片状金属粒子の種類や添加量等に応じて、適宜調整する。   At this time, mold temperature, cylinder temperature, injection speed, injection pressure, pressure holding time, cooling time, etc. so that the appearance defects due to uneven orientation of the scale-like metal particles on the surface of the injection molded product 1 can be suppressed. These conditions are appropriately adjusted according to the type of thermoplastic resin, the type and amount of scale-like metal particles, and the like.

熱可塑性樹脂としては、射出成型可能な熱可塑性樹脂であれば特に限定することなく使用でき、また、必要に応じて、熱可塑性樹脂に、光吸収剤、酸化防止剤等の添加剤を併せて配合した材料を用いても良い。熱可塑性樹脂の具体例としては、ポリエチレン、ポリプロピレン、ポリスチレン、ABS、メチルメタクリレート、ポリアミド、ポリエチレンテレフタレート、ポリブチレンテレフタレート、塩化ビニル、ポリ乳酸、ポリエステル等が挙げられる。   As the thermoplastic resin, any thermoplastic resin that can be injection-molded can be used without particular limitation, and if necessary, an additive such as a light absorber and an antioxidant may be combined with the thermoplastic resin. A blended material may be used. Specific examples of the thermoplastic resin include polyethylene, polypropylene, polystyrene, ABS, methyl methacrylate, polyamide, polyethylene terephthalate, polybutylene terephthalate, vinyl chloride, polylactic acid, polyester, and the like.

また、本発明に用いる鱗片状金属粒子としては、アトマイズにより得られた金属粒子を圧延した後、磨き処理して得られるアルミニウム粒子、透明樹脂もしくはフッ化マグネシウム等のハロゲン化金属化合物からなる層間に蒸着により積層されたアルミニウム層を含有する粒子、鉄を主成分とし、クロム、ニッケルを含有する金属粒子等を使用できる。   In addition, as the scale-like metal particles used in the present invention, the metal particles obtained by atomization are rolled and then polished between aluminum particles, a transparent resin, or an interlayer made of a metal halide compound such as magnesium fluoride. Particles containing an aluminum layer laminated by vapor deposition, metal particles containing iron as a main component, and containing chromium and nickel can be used.

これらの鱗片状金属粒子を金属酸化物等により被覆することも可能であるが、特に特定するものではなく、求める外観、コスト等から自由に選択できる。また、複数種の鱗片状金属粒子を混合して使用することも可能である。   These scale-like metal particles can be coated with a metal oxide or the like, but are not particularly specified, and can be freely selected from the desired appearance, cost, and the like. It is also possible to use a mixture of multiple types of scaly metal particles.

また、所望の色調を得るために、着色剤を有していてもよい。着色剤はマイカ、ガラスフレーク等のパール材、有機顔料、無機顔料、染料等を用いることができ、特に特定するものではない。   Moreover, in order to obtain a desired color tone, a colorant may be included. As the colorant, pearl materials such as mica and glass flake, organic pigments, inorganic pigments, dyes and the like can be used, and are not particularly specified.

さらに、本発明の着色ペレットは、付与したい機能に合わせて、繊維状フィラー、酸化
防止剤、紫外線吸収剤、難燃剤、抗菌剤、チキソトロピック剤、顔料分散剤、カップリング剤等を有していてもよい。
Furthermore, the colored pellet of the present invention has a fibrous filler, an antioxidant, an ultraviolet absorber, a flame retardant, an antibacterial agent, a thixotropic agent, a pigment dispersant, a coupling agent and the like in accordance with the function to be imparted. May be.

また、本実施の形態では、着色の方法として着色ペレットを例に挙げて説明したが、着色の方法は、マスターバッチ、ドライカラー等、特に特定するものではない。   In the present embodiment, the color pellets are described as an example of the coloring method. However, the coloring method is not particularly specified such as a masterbatch or a dry color.

図3は、本実施の形態で用いた射出成形品1の形状を示し、射出成形品1は、図3に示すごとく、中央部分で厚みを変化させた薄肉の矩形状に形成しており、肉厚側(図中上方側)から溶融熱可塑性樹脂を供給して成形している。厚みを変化させた箇所より上流側の肉厚側に角孔11を、下流側の薄肉側にリブ12を形成している。本実施形態の射出成形品1は、溶融熱可塑性樹脂の流れに速度ムラが発生しやすいよう厚みを変化させ、角孔11及びリブ12を形成しているが、形状については、長さ、厚み、幅、角孔11及びリブ12の有無等、特に特定するものではない。   FIG. 3 shows the shape of the injection-molded product 1 used in the present embodiment, and the injection-molded product 1 is formed in a thin rectangular shape with the thickness changed at the center as shown in FIG. Molding is performed by supplying molten thermoplastic resin from the thick side (upper side in the figure). A square hole 11 is formed on the thick side upstream from the portion where the thickness is changed, and a rib 12 is formed on the thin side on the downstream side. The injection-molded product 1 of the present embodiment changes the thickness so as to easily generate speed unevenness in the flow of the molten thermoplastic resin, and forms the square holes 11 and the ribs 12. The width, the presence / absence of the square holes 11 and the ribs 12 are not particularly specified.

次に、射出成形品の品位の評価方法について説明する。   Next, a method for evaluating the quality of an injection molded product will be described.

目視により、特に、射出成形品1の肉厚が変化する部分、角孔11及びリブ12が形成された部分について、明度の均一度を官能的に評価した。得られた射出成形品1の明度が部分的に低下する外観不良について、50cm離れた状態で視認できるレベルを1とし、全く視認できないレベルを5として、1から5までの5段階に官能評価した。   By visual inspection, in particular, the uniformity of lightness was evaluated sensuously at the portion where the thickness of the injection-molded product 1 changed, the portion where the square holes 11 and the ribs 12 were formed. About the appearance defect in which the lightness of the obtained injection-molded product 1 partially decreases, the level that can be visually recognized at a distance of 50 cm is set to 1, and the level that cannot be viewed at all is set to 5, and the sensory evaluation is performed in five stages from 1 to 5. .

また、射出成形品1中の鱗片状金属粒子2の粒子物性の計測方法について説明する。   Moreover, the measuring method of the particle | grain physical property of the scale-like metal particle 2 in the injection molded product 1 is demonstrated.

粒度分布の計測方法としては、画像解析法を用いた。撮影は、オリンパス社製マイクロスコープDSX−500を用い、試料面積は0.5mm平方とした。粒度計測は、マウンテック社製Mac−View Ver4.0を使用し、個数基準、体積基準の分布を各々求めた。このとき計測した鱗片状金属粒子数が1000以上となるように条件を調整した。ふるい法、自然沈降法、遠心沈降法、コールター法、動的光散乱法、レーザー回折散乱法を用いても同様に粒度分布計測は可能であるが、これらの手法では投影面積値を計測できないため、成形品表層における鱗片状金属粒子の隠蔽状態との相関が低下する。   An image analysis method was used as a method for measuring the particle size distribution. The photographing was performed using an Olympus microscope DSX-500, and the sample area was 0.5 mm square. For particle size measurement, Mac-View Ver4.0 manufactured by Mountec Co., Ltd. was used, and the number-based and volume-based distributions were obtained. The conditions were adjusted so that the number of scale-like metal particles measured at this time was 1000 or more. Particle size distribution can be measured in the same way using the sieve method, natural sedimentation method, centrifugal sedimentation method, Coulter method, dynamic light scattering method, and laser diffraction scattering method, but these methods cannot measure the projected area value. In addition, the correlation with the concealment state of the scale-like metal particles in the surface layer of the molded article is lowered.

本実施の形態では、鱗片状金属粒子としてアルミニウム光輝材を用い、アルミニウム光輝材の形状係数の計測方法としては、画像解析法を用いた。撮影には、オリンパス社製マイクロスコープDSX−500を用い、試料面積は0.5mm平方とした。形状係数は、マウンテック社製Mac−View Ver4.0を使用し、長径基準形状係数の平均値を求めた。長径基準形状係数は、具体的には、検出した粒子の長径と等しい直径を有する円の面積を、粒子の実面積で除して得た。このとき計測した鱗片状金属粒子数が1000以上となるように条件を調整し、平均値を算出した。粒子が真円であれば、長径基準形状係数は1となり、粒子形状が針状等異方性を有する場合に大きくなる。形状係数は、比表面積形状係数、体積形状係数等を計測可能であるが、射出成形品1表層における鱗片状金属粒子の隠蔽状態との相関が低下する。   In the present embodiment, an aluminum glitter material is used as the scale-like metal particles, and an image analysis method is used as a method for measuring the shape factor of the aluminum glitter material. The Olympus microscope DSX-500 was used for imaging, and the sample area was 0.5 mm square. As the shape factor, Mac-View Ver4.0 manufactured by Mountec Co., Ltd. was used, and the average value of the major axis reference shape factor was determined. Specifically, the major axis reference shape factor was obtained by dividing the area of a circle having a diameter equal to the major axis of the detected particle by the actual area of the particle. Conditions were adjusted so that the number of scale-like metal particles measured at this time was 1000 or more, and an average value was calculated. If the particle is a perfect circle, the major axis reference shape factor is 1, and increases when the particle shape has anisotropy such as needles. As the shape factor, a specific surface area shape factor, a volume shape factor, and the like can be measured, but the correlation with the concealed state of the scaly metal particles in the surface layer of the injection molded product 1 is lowered.

実施例または比較例に用いる主な原材料を一括して挙げれば以下のとおりである。
<鱗片状金属粒子>
(1)東洋アルミニウム社製 メタックスネオ N1 (平均粒子径 5ミクロン)
(2)東洋アルミニウム社製 メタックスネオ N9 (平均粒子径 20ミクロン)
(3)東洋アルミニウム社製 メタックスネオ T2 (平均粒子径 22ミクロン)
(4)東洋アルミニウム社製 メタックスネオ T5 (平均粒子径 17ミクロン)
(5)東洋アルミニウム社製 メタックスネオ T1 (平均粒子径 27ミクロン)
(6)エカルト社製 マスターセーフ MP15−20 (平均粒子径 15ミクロン)(7)エカルト社製 マスターセーフ MP16−20 (平均粒子径 16ミクロン)(8)エカルト社製 マスターセーフ MP29−20 (平均粒子径 29ミクロン)(9)尾池イメージング社製 エルジーネオ #325 (平均粒子径 44ミクロン)(10)尾池イメージング社製 エルジーネオ #500 (平均粒子径 30ミクロン)
(11)日本防湿工業社製 アストロシャイン NJ−1200(平均粒子径 12ミクロン)
<熱可塑性樹脂>
(12)ユーエムジー・エービーエス社製 U400(M.V.R 3g/10分)
(13)東レ社製ABS樹脂 AX05X03(M.F.R 15g/10分)
(14)ユーエムジー・エービーエス社製 EX18Z(M.V.R 22g/10分)(15)東レ社製ABS樹脂 AX05X08(M.F.R 29g/10分)
(16)東レ社製ABS樹脂 700―X01(M.F.R 40g/10分)
(17)東レ社製ABS樹脂 250―X10(M.F.R 48g/10分)
(18)プライムポリマー製PP樹脂 J−105H(M.F.R 14g/10分)
(19)プライムポリマー製PP樹脂 J−882HV(M.F.R 15g/10分)(20)日本ポリプロ製PP樹脂 BC03B(M.F.R 30g/10分)
(21)日本ポリプロ製PP樹脂 BC06C(M.F.R 60g/10分)
[射出成形品の評価結果]
表1は、射出成形品(P1〜P33)の構成、明度の均一度を評価した結果、及び成形品中の鱗片状金属粒子の5.9μm以下の個数濃度割合と鱗片状金属粒子の長径基準形状係数の計測結果を示す。表1の「熱可塑性樹脂」、「鱗片状金属粒子」の欄中に記載した(1)〜(21)は、上に列挙した原材料の番号を示す。
It is as follows if the main raw materials used for an Example or a comparative example are mentioned collectively.
<Scaly metal particles>
(1) Metax Neo N1 manufactured by Toyo Aluminum Co., Ltd. (average particle size 5 microns)
(2) Metax Neo N9 manufactured by Toyo Aluminum Co., Ltd. (average particle size 20 microns)
(3) Metax Neo T2 manufactured by Toyo Aluminum Co., Ltd. (average particle size 22 microns)
(4) Toyo Aluminum Co., Ltd. Metax Neo T5 (average particle size 17 microns)
(5) Metax Neo T1 manufactured by Toyo Aluminum Co., Ltd. (average particle size 27 microns)
(6) Ecart Co., Ltd. Master Safe MP15-20 (average particle size 15 microns) (7) Ecart Co., Ltd. Master Safe MP16-20 (average particle size 16 microns) (8) Ecart Co., Ltd. Master Safe MP29-20 (Average particles) (9) Elikeo # 325 (average particle size 44 microns) manufactured by Oike Imaging Co., Ltd. (10) Elgeneo # 500 (average particle size 30 microns) manufactured by Oike Imaging Co., Ltd.
(11) Astroshine NJ-1200 (average particle size 12 microns) manufactured by Nippon Moistureproof Industry
<Thermoplastic resin>
(12) U400 manufactured by UMG ABS Co., Ltd. (MV R 3 g / 10 min)
(13) ABS resin manufactured by Toray Industries, Inc. AX05X03 (MF 15 g / 10 min)
(14) EX18Z (MV 22 g / 10 min) manufactured by UMG ABS (15) ABS resin AX05X08 (MFR 29 g / 10 min) manufactured by Toray Industries, Inc.
(16) ABS resin 700-X01 (MF R 40 g / 10 min) manufactured by Toray Industries, Inc.
(17) Toray ABS resin 250-X10 (MF 48 g / 10 min)
(18) Prime polymer PP resin J-105H (MF R 14 g / 10 min)
(19) Prime polymer PP resin J-882HV (MF 15 g / 10 min) (20) Nippon Polypropylene PP resin BC03B (MF 30 g / 10 min)
(21) Nippon Polypro PP resin BC06C (MF R 60 g / 10 min)
[Evaluation results of injection molded products]
Table 1 shows the composition of injection molded products (P1 to P33), the results of evaluating the uniformity of lightness, the number concentration ratio of the flaky metal particles in the molded product of 5.9 μm or less, and the long diameter standard of the flaky metal particles. The measurement result of the shape factor is shown. (1) to (21) described in the columns of “thermoplastic resin” and “scale-like metal particles” in Table 1 indicate the numbers of the raw materials listed above.

Figure 2014091819
Figure 2014091819

表2は、2種の鱗片状金属粒子を併用して作成した射出成形品(P34〜P50)の構成、明度の均一度を評価した結果、及び射出成形品中の鱗片状金属粒子の5.9μm以下
の個数濃度割合と鱗片状金属粒子の長径基準形状係数の計測結果を示す。表2の「熱可塑性樹脂」、「鱗片状金属粒子」の欄中に記載した(1)〜(21)は、上に列挙した原材料の番号を示す。
Table 2 shows the configuration of injection molded products (P34 to P50) prepared by using two kinds of scale-like metal particles in combination, the results of evaluating the uniformity of lightness, and the scale-like metal particles in the injection-molded product. The measurement results of the number concentration ratio of 9 μm or less and the long diameter reference shape factor of the scaly metal particles are shown. (1) to (21) described in the columns of “thermoplastic resin” and “scale-like metal particles” in Table 2 indicate the numbers of the raw materials listed above.

なお、表2に示す射出成形品(P34〜P50)は、2種類の鱗片状金属粒子を併用したが、3種以上の鱗片状金属粒子を併用することも同様に可能である。   In addition, although the injection-molded article (P34-P50) shown in Table 2 used two types of scaly metal particles in combination, it is also possible to use three or more types of scaly metal particles in combination.

Figure 2014091819
Figure 2014091819

表1及び表2に示されるように、射出成形品中における鱗片状金属粒子の5.9μm以下の個数濃度割合が75%以上であり、且つ鱗片状金属粒子の添加量が2.0重量部以上、4.0重量部以下の範囲では、P1〜P3、P10〜P12、P31〜P35、P37、P38、P40〜P43及びP51〜P53に示すように、明度の均一殿の官能評価が
4以上となり、外観不良のない良好な射出成形品が得られた。さらには、添加量を3.5重量部以上、4.0重量部以下とすることで、P3、P12、P33、P51、P53に示すように、明度の均一度の官能評価結果が5となり、より良好な射出成形品を得ることができ、好ましい。
As shown in Tables 1 and 2, the number concentration ratio of 5.9 μm or less of the scale-like metal particles in the injection-molded product is 75% or more, and the addition amount of the scale-like metal particles is 2.0 parts by weight. In the range of 4.0 parts by weight or less, as shown in P1 to P3, P10 to P12, P31 to P35, P37, P38, P40 to P43, and P51 to P53, the sensory evaluation of the uniform brightness is 4 or more. Thus, a good injection-molded product having no appearance defect was obtained. Furthermore, by setting the addition amount to 3.5 parts by weight or more and 4.0 parts by weight or less, as shown in P3, P12, P33, P51, and P53, the sensory evaluation result of brightness uniformity becomes 5, A better injection molded product can be obtained, which is preferable.

射出成形品中における鱗片状金属粒子の5.9μm以下の個数濃度割合が75%以上、且つ鱗片状金属粒子の添加量が2.0重量部以上、4.0重量部以下の範囲にすることにより、射出成形品表層部分に緻密に鱗片状金属粒子が分散され、表層に分散した鱗片状金属粒子の平均粒子間距離が小さくなるため、射出成形品の厚みに依らず、均一な外観状態を実現できる。   The number concentration ratio of 5.9 μm or less of the scale-like metal particles in the injection molded product is 75% or more, and the addition amount of the scale-like metal particles is in the range of 2.0 parts by weight or more and 4.0 parts by weight or less. Therefore, the scale-like metal particles are densely dispersed in the surface part of the injection-molded product, and the average inter-particle distance of the scale-like metal particles dispersed in the surface layer is reduced, so that a uniform appearance state is obtained regardless of the thickness of the injection-molded product. realizable.

射出成形品中における鱗片状金属粒子の5.9μm以下の個数濃度割合が75%未満の場合には、射出成形品表層に鱗片状金属粒子が均一に分散していないところが部分的に存在するため、外観上良好でない射出成形品となり、射出成形品表層の明度の均一度の官能評価結果が3以下となった。   When the number concentration ratio of 5.9 μm or less of the scale-like metal particles in the injection-molded product is less than 75%, there is a portion where the scale-like metal particles are not uniformly dispersed in the surface layer of the injection-molded product. The result was an injection molded product with poor appearance, and the sensory evaluation result of the lightness uniformity of the surface layer of the injection molded product was 3 or less.

射出成形品中における鱗片状金属粒子の5.9μm以下の個数濃度割合が75%以上であっても、鱗片状金属粒子の添加量が2.0重量部未満の場合には、射出成形品表層における鱗片状金属粒子の個数濃度が低下するために、射出成形品表層を緻密に隠蔽することができず、表2のP46〜P48に示すように、射出成形品表層の明度の均一度の官能評価結果が3以下となった。   Even if the number concentration ratio of 5.9 μm or less of the scale-like metal particles in the injection-molded product is 75% or more, the surface layer of the injection-molded product when the addition amount of the scale-like metal particles is less than 2.0 parts by weight. Since the number concentration of the scale-like metal particles in the resin layer decreases, the surface layer of the injection-molded product cannot be densely concealed, and as shown in P46 to P48 of Table 2, the brightness uniformity of the surface layer of the injection-molded product The evaluation result was 3 or less.

射出成形品中における鱗片状金属粒子の添加量が4.0重量部を超過した場合には、射出成形の際に発泡が生じ、いわゆるシルバーストリーク等の外観不良が生じ、表2のP49及びP50に示すように、成形品表層の明度の均一度の官能評価結果が低下した。   When the addition amount of the scale-like metal particles in the injection-molded product exceeds 4.0 parts by weight, foaming occurs during the injection molding, resulting in poor appearance such as so-called silver streak, and P49 and P50 in Table 2 As shown in Fig. 2, the sensory evaluation result of the brightness uniformity of the surface layer of the molded product was lowered.

鱗片状金属粒子の長径基準形状係数が、1.5未満の場合には、充分に圧延されていない鱗片状金属粒子の割合が高くなり、表1のP4〜P6、P25〜P27に示すように、射出成形品表層の明度の均一度の官能評価結果が3以下と低下した。このことは、圧延されていない鱗片状金属粒子は表層の凹凸が大きいため、反射光の方向性が不均一になることに起因する。   When the long-axis standard shape factor of the scaly metal particles is less than 1.5, the ratio of scaly metal particles that are not sufficiently rolled increases, as shown in P4 to P6 and P25 to P27 of Table 1. The sensory evaluation result of the lightness uniformity of the surface layer of the injection molded product was lowered to 3 or less. This is because the scale-like metal particles that have not been rolled have large irregularities on the surface layer, and thus the directionality of the reflected light becomes non-uniform.

鱗片状金属粒子の長径基準形状係数が2.0を超過した場合には、鱗片状金属粒子が異方性を有するため、射出成形品に対する視角度が単一の条件下において、鱗片状金属粒子の向きが異なる一部分のみの明度が異なり、その結果として成形品表層の明度の均一度の官能評価結果が3以下と低下した。   When the major axis shape factor of the scale-like metal particles exceeds 2.0, the scale-like metal particles have anisotropy, so that the scale-like metal particles have a single viewing angle with respect to the injection molded product. As a result, the sensory evaluation result of the brightness uniformity of the surface layer of the molded article was lowered to 3 or less.

尚、射出成形品中における鱗片状金属粒子の5.9μm以下の個数濃度割合が75%以上で、鱗片状金属粒子の添加量が2.0重量部未満、あるいは4.0重量部より多い場合の例として、2種類の鱗片状金属粒子を併用した射出成形品(P46〜P50、P54)を示しているが、表1に示す1種類の鱗片状金属粒子を用いた射出成形品の場合も同様であったため、1種類のみの鱗片状金属粒子を用いた射出成形品のデータは省略している。   In addition, when the number concentration ratio of 5.9 μm or less of the scale-like metal particles in the injection-molded product is 75% or more and the addition amount of the scale-like metal particles is less than 2.0 parts by weight or more than 4.0 parts by weight As an example, an injection-molded product (P46 to P50, P54) using two kinds of scaly metal particles is shown, but also in the case of an injection-molded product using one kind of scaly metal particles shown in Table 1. Since it was the same, the data of the injection-molded product using only one type of scaly metal particles is omitted.

本発明に係る射出成形品は、熱可塑性樹脂に、少なくとも鱗片状金属粒子を混合した樹脂組成物であって、画像解析法により計測した個数基準粒度分布における5.9μm以下の粒子の個数割合が75%以上である鱗片状金属粒子を、熱可塑性樹脂100重量部に対して、2.0重量部以上4.0重量部以下の範囲で含有する射出成形用樹脂組成物を射出成形することで得られるものである。   The injection-molded article according to the present invention is a resin composition in which at least scaly metal particles are mixed with a thermoplastic resin, and the number ratio of particles of 5.9 μm or less in the number-based particle size distribution measured by an image analysis method is By injection-molding a resin composition for injection molding containing 75% or more of the scaly metal particles in a range of 2.0 parts by weight or more and 4.0 parts by weight or less with respect to 100 parts by weight of the thermoplastic resin. It is obtained.

このとき、同じく画像解析法により計測される鱗片状金属粒子の長径基準形状係数が1
.5以上、2.0未満であることが好ましい。
At this time, the long-axis reference shape factor of the scaly metal particles measured by the image analysis method is 1
. It is preferably 5 or more and less than 2.0.

以上のように、本発明にかかる射出成形用樹脂組成物は、十分なメタリック感を有する射出成形品を得ることができ、自動車分野、家電分野等、デザイン性を重視する加飾部品に利用することができる。   As described above, the resin composition for injection molding according to the present invention can obtain an injection-molded product having a sufficient metallic feeling, and is used for decorative parts that place importance on design, such as the automobile field and the household appliance field. be able to.

1 射出成形品
2 鱗片状金属粒子
3 熱可塑性樹脂
DESCRIPTION OF SYMBOLS 1 Injection molded product 2 Scale-like metal particle 3 Thermoplastic resin

Claims (7)

熱可塑性樹脂に鱗片状金属粒子を混合した射出成形用樹脂組成物であって、
前記鱗片状金属粒子は、画像解析法により計測した個数基準粒度分布が5.9μm以下の粒子の個数割合を75%以上とし、かつ、熱可塑性樹脂100重量部に対して、2.0重量部以上、4.0重量部以下の範囲で含有する射出成形用樹脂組成物。
A resin composition for injection molding in which scaly metal particles are mixed with a thermoplastic resin,
The scaly metal particles have a number ratio of particles having a number-based particle size distribution of 5.9 μm or less measured by an image analysis method of 75% or more, and 2.0 parts by weight with respect to 100 parts by weight of the thermoplastic resin. The resin composition for injection molding contained in the range of 4.0 parts by weight or less.
鱗片状金属粒子を、熱可塑性樹脂100重量部に対して3.5以上、4.0重量部以下の範囲で含有する請求項1記載の射出成形用樹脂組成物。 The resin composition for injection molding according to claim 1, wherein the scaly metal particles are contained in the range of 3.5 to 4.0 parts by weight with respect to 100 parts by weight of the thermoplastic resin. 画像解析法により計測した鱗片状金属粒子の長径基準形状係数が1.5以上、2.0以下であることを特徴とする請求項1または請求項2に記載の射出成形用樹脂組成物。 3. The resin composition for injection molding according to claim 1, wherein the scale-shaped metal particles measured by an image analysis method have a major axis reference shape factor of 1.5 or more and 2.0 or less. 鱗片状金属粒子の長径基準形状係数が1.7以上、1.8以下であることを特徴とする請求項3に記載の射出成形用樹脂組成物。 The resin composition for injection molding according to claim 3, wherein the scale-like metal particles have a major axis reference shape factor of 1.7 or more and 1.8 or less. 請求項1から4のいずれかに記載の樹脂組成物を用いたことを特徴とする射出成形品。 An injection molded product using the resin composition according to any one of claims 1 to 4. 請求項5に記載の射出成形品からなる加飾部品。 A decorative part comprising the injection-molded product according to claim 5. 請求項6に記載の加飾部品を用いたことを特徴とする家電製品。 A home appliance using the decorative part according to claim 6.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104441401A (en) * 2014-11-04 2015-03-25 长春富维—江森自控汽车饰件***有限公司 Free-spraying metallic-luster injection molding process for car interior trim parts and exterior parts
JPWO2017038623A1 (en) * 2015-08-31 2017-08-31 東洋製罐株式会社 Decorative resin composition and multilayer direct blow bottle having a metallic layer formed using the composition
JP2021188916A (en) * 2020-05-26 2021-12-13 豊田合成株式会社 Vehicular garnish
JP7505631B2 (en) 2023-09-06 2024-06-25 豊田合成株式会社 Vehicle Garnish

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104441401A (en) * 2014-11-04 2015-03-25 长春富维—江森自控汽车饰件***有限公司 Free-spraying metallic-luster injection molding process for car interior trim parts and exterior parts
JPWO2017038623A1 (en) * 2015-08-31 2017-08-31 東洋製罐株式会社 Decorative resin composition and multilayer direct blow bottle having a metallic layer formed using the composition
JP2021188916A (en) * 2020-05-26 2021-12-13 豊田合成株式会社 Vehicular garnish
JP7384113B2 (en) 2020-05-26 2023-11-21 豊田合成株式会社 vehicle garnish
JP7505631B2 (en) 2023-09-06 2024-06-25 豊田合成株式会社 Vehicle Garnish

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