JP7385490B2 - Resin compositions for coloring molded objects, molded objects and masterbatches - Google Patents

Description

The present invention relates to a resin composition for coloring a molded object, a molded object, and a masterbatch.

Conventionally, resin molded bodies have been used for furniture and vehicle interior materials. These resin molded objects are used in spaces where people stay for a certain period of time, so we designed various molded objects with different colors and textures to provide a sense of psychological security and a luxurious feel to the visitors. The design is elaborate.
One such design on the surface of a molded object is to create a nonwoven fabric-like design that reproduces the warmth and depth of color of cloth on the surface of a resin molded object. For example, Patent Document 1 describes a resin composition for nonwoven fabric-like designs containing carbonized polyacrylonitrile fiber piles and viscose rayon fiber piles colored with a pigment in a stock solution.

JP2000-344977

In recent years, as users' aesthetic sense has improved, there has been a demand for interior materials with higher design qualities. For example, in the case of cloth and woven fabrics, there are not only those with a texture like non-woven fabric, but also those with a deeper, characteristic design such as the thread weaving seen in carpets, which is made by weaving loop threads twisted together into the base material. Materials with properties are used.

Up until now, resin molded objects have been required to have a design that expresses the depth of the hair in the style of a woven fabric, but woven fabrics are made by densely arranging looped yarns in a ring shape on the underlying fabric surface. Because it is woven, the surface of the woven fabric is made up of bent loop yarns packed together. For this reason, unlike a non-woven fabric made up of entangled fibers as in Patent Document 1, a complex structure that expresses the long pile of the piled weave and the deep three-dimensional effect and the condition of the loop yarns densely packed on the surface is created on the surface of the resin molded body. Because it was a design, it was difficult to reproduce it.

In addition, viscose rayon fiber, which has been commonly used as fiber pile, is used when kneading heated and melted thermoplastic resin and fiber pile, or when heating and melting a kneaded thermoplastic resin composition and molding it. The fiber pile yellows under the influence of heat, changing its color from yellow to brown to black. For this reason, when using colored viscose rayon fibers like those in Patent Document 1, the color of the base molded body or the color of the fiber pile should be changed to yellowish or brownish so as not to make the change in fiber color noticeable. There were restrictions on the design, such as limiting the color to black or black.

In addition, since resin moldings are used for long periods of time in environments exposed to sunlight indoors and outdoors, the resin composition for coloring molded objects is weather-resistant to prevent fading or discoloration due to the effects of light and to maintain the design for a long time. Sex was required.

The present invention was made in view of the above-mentioned problems, and provides a resin composition for coloring a molded object that does not yellow due to heat during kneading or molding, has excellent weather resistance, and has a good weave texture. The purpose is to provide

As a result of extensive studies, the present inventor has discovered a resin composition in which two types of fiber piles containing pigments and having a diameter of 25 to 80 μm and a length of 0.1 to 3 mm and having different hues, a thermoplastic resin, and a pigment are kneaded together. A resin composition for coloring a molded object that has an excellent weave-like design and weather resistance when the molded object is molded using a material, and does not yellow even when the resin composition is kneaded or heated during molding. I found out that things can be obtained.
That is, the inventor
(1) A thermoplastic resin containing a pigment, a first fiber pile containing a black, white or chromatic pigment, and a second fiber pile containing a chromatic pigment, the first fiber pile and the The second fiber pile is a fiber pile made of two types of polyester having different hues and having a diameter of 25 to 80 μm and a length of 0.1 to 3 mm , and the thermoplastic resin is a polyolefin resin. A resin composition for coloring a molded object,
(2) The resin composition for coloring a molded object according to (1), wherein the polyester fiber pile is a fiber pile made of either polyethylene terephthalate or polyethylene terephthalate copolymer;
(3) the resin composition for coloring a molded object according to (1) to (2), wherein the polyester fiber pile has a melting point of 240°C or higher;
( 4 ) The molded body coloring according to (1) to ( 3 ), wherein the total content of the fiber pile is 0.1% by mass or more and 50% by mass or less based on the entire resin composition for coloring a molded body. resin composition for
( 5 ) The resin composition for coloring a molded object according to (1) to ( 4 ) further containing an ultraviolet absorber,
( 6 ) A molded object using the resin composition for coloring a molded object according to any one of (1) to ( 5 ),
( 7 ) A masterbatch using the resin composition for coloring molded objects according to any one of (1) to ( 5 ),
( 8 ) A method for producing a molded body, comprising a step using the resin composition for coloring a molded body according to any one of (1) to ( 5 );
It is related to.

The present invention has been made in view of the above-mentioned problems, and provides a molded article that does not cause yellowing of the fiber pile due to heat during kneading or molding, has excellent weather resistance, and has a good spliced texture. be able to.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated in detail. Note that this embodiment is only one mode for carrying out the present invention, and the present invention is not limited to this embodiment, and various modifications and embodiments can be made without departing from the gist of the present invention. is possible. In addition, in this specification, the notation "a to b" in the description of numerical ranges represents from a to b, unless otherwise specified. For example, "1 to 5% by mass" means "1 to 5% by mass".

<Resin composition for coloring molded objects>
The resin composition for coloring a molded object of the present embodiment is mainly used to obtain a molded object that does not yellow due to heat during kneading or molding, has excellent weather resistance, and has a good spliced texture. suitable.

The resin composition for coloring a molded object in this embodiment includes a thermoplastic resin containing a pigment, a first fiber pile containing a black, white or chromatic pigment, and a second fiber pile containing a chromatic pigment. The first fiber pile and the second fiber pile are polyester fiber piles of a specific size. Each component in this embodiment will be explained in detail below.

<Fiber pile>
Examples of the polyester resin contained in the fiber pile of this embodiment include polyethylene terephthalate and polyethylene terephthalate copolymer. By selecting these resins, even when the resin composition for coloring a molded object is heated during kneading or molding, the fiber pile does not turn yellow, and stable coloring can be obtained.

The polyester resin used in the fiber pile of this embodiment is selected so that the melting point of the fiber pile is preferably 240°C or higher, more preferably 245°C or higher. By selecting this polyester resin, when the fiber pile is kneaded with a thermoplastic resin or when molded using the kneaded resin composition for coloring a molded object, the fiber pile does not soften and can be stably added. A woolen-like design can be obtained. If the melting point of the fiber pile is less than 240°C, the fiber pile will soften due to the heat of the molten thermoplastic resin and the effects of shear heat during kneading or molding using the resin composition for coloring a molded object. , the fiber pile is elongated due to shearing and the design quality is reduced.
Here, the melting point refers to the temperature at the top of a single crystal melting peak of a fiber pile measured by a differential scanning calorimeter (DSC).

The present inventors used a colored polyester fiber pile of a specific size to be described later to reproduce the diffused reflection of light from each bent loop yarn of the woven fabric on the surface of the molded product, and further We have discovered that by reproducing the shading in the depth direction, it is possible to create a design with depth and a three-dimensional effect that is unique to woven fabric.
In other words, by mixing the hue of the thermoplastic resin and the hue of the first fiber pile, which is colored black, white, or chromatic, the hue of the entire molded article is reproduced, and the color is added by the first fiber pile. By reproducing the diffused reflection of light from each loop yarn lined up on the surface of the woolen fabric, and further expressing shadows with a second fiber pile of a chromatic color different from the first fiber pile, the spliced wool weave of this embodiment We have discovered that it is possible to obtain a design with a deep three-dimensional effect due to the length of the hair, which is unique to . From the viewpoint of creating this shading, if the color obtained by mixing the thermoplastic resin and the first pile is a dark color, the second fiber pile, which is a light chromatic color, is mixed, and the color of the thermoplastic resin and the first pile is mixed. If the color is light, it is preferable to select a second fiber pile that is dark chromatic.
In this embodiment, a stable hue can be obtained by using a polyester fiber pile, so the hues of the first fiber pile and the second fiber pile can be selected from a wide range of choices from the above options according to the desired design. can do. Moreover, in order to obtain a deep three-dimensional effect, a third or more fiber pile may be further included in the resin composition for coloring a molded object.

The diameters of the first fiber pile and the second fiber pile of this embodiment are preferably 25 to 80 μm, more preferably 28 to 75 μm, and even more preferably 30 to 60 μm. As a result, the fiber pile exhibits a design and shading similar to the loop threads of a pile weave, and a good design similar to that of a pile weave can be obtained. If the diameter of the fiber pile is less than 25 μm, the fiber pile will not stand out as a fiber, making it impossible to obtain a good woven-like design, and if it exceeds 80 μm, the shape of each fiber pile will be different from the formed object It is too conspicuous and it is impossible to obtain a resin molded article with good design.

Moreover, the fiber pile of this embodiment is obtained by cutting polyester fibers spun by a general melt spinning method with a general cutting machine such as a guillotine cutter. The length of the fiber pile is preferably 0.1 to 3 mm, more preferably 0.2 to 2 mm. As a result, the fiber pile exhibits a design similar to the loop threads of a pile weave, and a good design similar to a pile weave can be obtained. If the length of the fiber pile is less than 0.1 mm, the fiber pile will not be noticeable, making it impossible to obtain the design of a pile weave, and if the length exceeds 3 mm, the entangled fiber pile cannot be loosened, and heat When the plastic resin and the fiber pile are kneaded, the fiber piles that become entangled do not disperse and become aggregates, making it impossible to obtain a good design with a woven texture.

The content of the fiber pile contained in the resin composition for coloring a molded object of the present embodiment is preferably 0.1 to 50% by mass, more preferably 0.2 to 40% by mass. If the content of the fiber pile is less than 0.1% by mass, the fiber pile will be inconspicuous, making it impossible to obtain the design of a pile weave, and if it exceeds 50% by mass, the fiber pile will melt when kneaded with the thermoplastic resin. The thermoplastic resin cannot sufficiently wet the fiber pile, and the resin composition for coloring a molded object becomes brittle and difficult to pelletize.

By coloring the fiber pile of this embodiment with a pigment, deterioration of the color of the fiber pile can be suppressed during long-term use of the molded article. The fiber pile can be colored by adding a pigment during polyester polymerization, or by adding a pigment during melt-spinning of polyester fibers to a polyester resin pellet or chip and a coloring agent containing a pigment such as a master chip or masterbatch using an extruder for spinning. Common methods are used, such as adding it to a container and coloring it. In particular, the method of feeding polyester resin pellets and a coloring agent into an extruder during melt spinning allows the color to be changed for each spinning, and is therefore suitable for using fiber piles of multiple colors as in this embodiment. Note that when spinning polyester fibers by blending a polyester resin and a coloring agent containing a pigment, other additives, additive chips, or additive masterbatches may be added.

As the pigment for coloring the fiber pile, either an inorganic pigment or an organic pigment with good weather resistance is selected. For example, phthalocyanine pigments such as phthalocyanine blue and phthalocyanine green; organic pigments such as polycyclic pigments such as quinacridone pigments, perylene pigments, quinophthalone pigments, and anthraquinone pigments; or carbon black, ultramarine, cobalt, Bengara, titanium oxide, and nickel titanium. Inorganic pigments such as yellow and chromium titanium yellow can be preferably used as pigments with good weather resistance. These pigments can be used alone or in combination of two or more.
The pigment concentration in the fiber pile is preferably 0.01 to 10% by weight, more preferably 0.1 to 5% by weight. If it is less than 0.01% by mass, the coloring of the fiber pile will be too light, making it impossible to obtain the design of a pile-weave style, and if it exceeds 10% by mass, the molten threads will melt during spinning of polyester fibers or drawing of yarn. It breaks starting from the pigment particles, making stable molding impossible.

<Thermoplastic resin>
The thermoplastic resin used in the resin composition for coloring a molded object is preferably a polyolefin resin, and one type of polyolefin resin may be used alone or two or more types may be mixed. By selecting these low melting point resins, the fiber pile will not melt even if the thermoplastic resin is melted during kneading of the resin composition for coloring a molded object or during molding using the resin composition for coloring a molded object. A stable woven design can be obtained in the molded article.
Examples of polyolefin resins include polyethylene, polypropylene, homopolypropylene, random copolymer polypropylene, block copolymer polypropylene, isotactic polypropylene, syndiotactic polypropylene, α-olefin copolymers such as ethylene-vinyl acetate copolymers, and polyolefins. Examples include thermoplastic elastomers. From the viewpoint of melting only the thermoplastic resin without melting the polyester fiber pile during molding, polyolefin resins that melt at a low melting point are preferred, and polyethylene resins, polypropylene resins, and ethylene-vinyl acetate copolymers are more preferred.

<Pigments used in thermoplastic resins>
By coloring the thermoplastic resin of the resin composition for coloring a molded body according to the present embodiment with a pigment, deterioration of the color of the design on the surface of the molded body can be suppressed during long-term use of the molded body. As the pigment for coloring, either an inorganic pigment or an organic pigment with good weather resistance is selected. For example, phthalocyanine pigments such as phthalocyanine blue and phthalocyanine green; organic pigments such as polycyclic pigments such as quinacridone pigments, perylene pigments, quinophthalone pigments, and anthraquinone pigments; or carbon black, ultramarine, cobalt, Bengara, titanium oxide, and nickel titanium. Inorganic pigments such as yellow and chromium titanium yellow can be preferably used as pigments with good weather resistance. These pigments can be used alone or in combination of two or more.

The resin composition for coloring a molded object of the present embodiment can provide a hairy three-dimensional effect similar to a pile weave by making the fiber pile visible on the surface of the molded object and from the surface to a depth of several to several tens of μm. From this point of view, the ratio of the content of pigments used for coloring the thermoplastic resin to the content of pile fibers is such that the total content of pigments is 0.1 part by weight for the total content of pile fibers of 1 part by weight. It is preferable that the pigment content be 0.02 to 1 part by weight, and more preferably the total pigment content be 0.025 to 0.4 part by weight. If the total content of pigments exceeds 1 part by weight, the pigment will have a high hiding effect, and only the pile fibers present on the surface of the molded article will be visible, making it impossible to obtain a sufficient three-dimensional effect. If the total content of is less than 0.02 part by weight, the transparency of the entire resin composition for coloring a molded object will be high, and the background color will be transmitted when the molded object is used, and the color tone will change depending on the background. , it is not possible to obtain a weave texture with the desired color.

<Ultraviolet absorber>
The resin composition for coloring a molded object of the present invention preferably contains an ultraviolet absorber, which suppresses the influence of external light on the pigment and fiber pile during long-term use of the molded object, and prevents physical deterioration of the thermoplastic resin. weather resistance can be improved.
Furthermore, more preferably, the ultraviolet absorber is also contained in the fiber pile, thereby improving weather resistance for a longer period of time.

The ultraviolet absorber used in the present invention is a component that absorbs ultraviolet rays that promote deterioration of resin components, and benzophenone compounds, triazole compounds, benzoate compounds, etc. can be used.
Specifically, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 5,5'-methylenebis(2-hydroxy-4-methoxybenzophenone), etc. -Hydroxybenzophenones; 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole- 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole -ol, 2-(2'-hydroxy-3',5'-dicumylphenyl)benzotriazole, 2,2'-methylenebis(4-tert-octyl-6-(benzotriazolyl)phenol), 2 2-(2'-hydroxyphenyl)benzotriazoles such as -(2'-hydroxy-3'-tert-butyl-5'-carboxyphenyl)benzotriazole; phenyl salicylate, resorcinol monobenzoate, 2,4-di- 3-butylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate, 2,4-di-tert-amylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate, hexadecyl-3,5-di-tert-butyl-4-hydroxybenzoate, Benzoates such as 3-butyl-4-hydroxybenzoate; substituted oxanilides such as 2-ethyl-2'-ethoxyoxanilide and 2-ethoxy-4'-dodecyloxanilide; ethyl-α-cyano-β,β - Cyanoacrylates such as diphenyl acrylate, methyl-2-cyano-3-methyl-3-(p-methoxyphenyl) acrylate; 2-(2-hydroxy-4-octoxyphenyl)-4,6-bis(2 , 4-di-tert-butylphenyl)-s-triazine, 2-(2-hydroxy-4-methoxyphenyl)-4,6-diphenyl-s-triazine, 2-(2-hydroxy-4-propoxy-5- Examples include triaryltriazines such as methylphenyl)-4,6-bis(2,4-di-tert-butylphenyl)-s-triazine. These may be used alone or in combination of two or more.

In addition to the ultraviolet absorber, a weathering agent such as a hindered amine weathering agent (HALS) may be added, and higher weather resistance can be obtained by using both together.

<Other ingredients>
The resin composition for coloring molded objects of this embodiment may contain various stabilizers such as heat-resistant stabilizers, ester waxes, polyethylene waxes, antioxidants, and antistatic agents, to the extent that the effects of the present invention are not impaired. Various additives such as flame retardants and surfactants may be added.

<Method for producing resin composition for coloring molded objects>
The resin composition for coloring a molded object in this embodiment can be manufactured as follows. First, using a normal kneading machine such as a Banbury mixer, kneader, twin-screw extruder, etc., the pigment, two types of fiber piles, thermoplastic resin, and other necessary additives are kneaded to create a kneaded product. . At this time, the kneading temperature can be preferably set at 30 to 230°C, more preferably 50 to 200°C, and still more preferably 80 to 180°C so as not to melt the fiber pile. The kneaded material is put into a single-screw extruder, and the strands discharged from the die of the extruder are cut after cooling, or in the case of a twin-screw extruder, the strands discharged from the die of the extruder during kneading are cut after cooling. In this way, pellets of the resin composition for coloring a molded object are obtained.

<How to use the resin composition for coloring molded objects>
By molding using the resin composition for coloring a molded object according to the present embodiment, it is possible to obtain a good design of the pile weave, and a molded object having excellent heat resistance and weather resistance can be obtained. The entire amount of the resin composition for coloring a molded object may be charged into a molding machine and molded, or it may be mixed with diluted resin pellets as a masterbatch and then charged into a molding machine and molded.
Additionally, additives such as heat stabilizers and weather stabilizers can be added as necessary when charging the materials into the molding machine.
The molded article can be molded into the desired shape by injection molding, sheet molding, blow molding, press molding, compression molding, etc., and the molding temperature during molding is preferably 230°C or less. .

<Masterbatch>
The masterbatch of this embodiment is made using the above-mentioned resin composition for coloring a molded object, and is pelletized together with various additives added as necessary. Since the masterbatch is a concentrate of fiber pile and pigment, it is used after being diluted with a thermoplastic resin diluent resin when producing a molded article.

The concentration of pile fibers contained in the masterbatch is set according to the molded product finally obtained, and may be set as follows, for example.

(Resin for dilution)
The thermoplastic resin for diluting the masterbatch is preferably a polyolefin resin, similar to the thermoplastic resin contained in the resin composition for coloring a molded object, and one type of polyolefin resin may be used alone, or two or more types may be used. May be mixed. From the viewpoint of melting only the thermoplastic resin without melting the polyester fiber pile during kneading, and from the viewpoint of good mixing with other resins, polyolefin resins are preferred, and polyethylene and polypropylene are more preferred.
The diluent resin and the thermoplastic resin contained in the masterbatch may be the same or different resins as long as they are selected from polyolefin resins.

(Other ingredients in the masterbatch)
Note that the masterbatch can also contain the ultraviolet absorber at a concentration depending on the dilution ratio. In addition, various additives such as heat-resistant stabilizers, ester waxes, polyethylene waxes, antioxidants, antistatic agents, flame retardants, surfactants, etc., and hindered amine-based A weathering agent may also be added.

<Molded object>
The molded product in this embodiment can be used in fields such as furniture, miscellaneous goods, and automobile interior parts where appearance is important and processed into various shapes.
The molded article of this embodiment may be provided with a lattice-like or hoof-like pattern or grains on the surface in order to emphasize the three-dimensional effect of the pile weave.

Next, the present invention will be explained in detail with reference to examples, but the content of the present invention is not limited to the examples.

(pigments/additives)
The thermoplastic resins and pigments used to color the thermoplastic resins used in Examples and Comparative Examples are as follows.
・Thermoplastic resin Novatec PP BC03B (polypropylene resin, manufactured by Nippon Polypro Co., Ltd.)
・Pigment WHITE Taipeiku CR-60 (manufactured by Ishihara Sangyo Co., Ltd.)
・Pigment BLACK #30L (manufactured by Mitsubishi Chemical Corporation)
・Pigment BLUE Ultramarine D-981 (manufactured by Daiichi Kasei Kogyo Co., Ltd.)
・Pigment BROWN 42-134A (manufactured by Tokan Material Technology Co., Ltd.)
・Pigment RED Bayferrox 130M (manufactured by LANXESS)
・Pigment PINK Cinquasia Pink K4430FP (manufactured by BASF)
・Pigment YELLOW PA Yellow 890D (manufactured by BASF)
In addition, the following ultraviolet absorber was used as an additive.
・Ultraviolet absorber 1 Tinuvin 326 (manufactured by BASF)

(polyester fiber pile)
<Fiber pile 1-5>
Pigments were added to homotypic polyethylene terephthalate resin pellets to give the hues shown in Table 1, and then melt-spun was carried out, and after spinning, they were drawn to the fineness shown in Table 1 to obtain colored polyester fibers. This colored polyester fiber was cut to the cut length shown in Table 1 to obtain a polyester fiber pile.

<Fiber pile 6-13>
Pigments were added to polyethylene terephthalate resin pellets to give the hues shown in Table 1 and melt-spun using a spinning tester. After spinning, the pellets were drawn to have the fineness shown in Table 1 to obtain colored polyester fibers. This colored polyester fiber was cut to the cut length shown in Table 1 to obtain a polyester fiber pile.

<Fiber pile 14>
Pigments were added to polybutylene terephthalate (product name: Novaduran 5020, manufactured by Mitsubishi Engineering Plastics Co., Ltd.) so that the hues shown in Table 1 would be obtained, and melt spinning was performed using a spinning tester, so that the fineness of the yarn would be as shown in Table 1 after spinning. A colored polyester fiber was obtained by drawing. This colored polyester fiber was cut to the cut length shown in Table 1 to obtain a polyester fiber pile 14.

<Fiber pile 15>
Polyethylene terephthalate resin was melt-spun using a spinning tester, and after spinning, it was drawn to the fineness shown in Table 1 to obtain polyester fibers.
Cationic dye (manufactured by Nippon Kayaku Co., Ltd., product name: Kayacryl Blue GSL-ED (B-54)) 6% owf, acetic acid 0.3 mL/L, sodium nitrate 20 g/L, benzyl alcohol 70 g/L, dyeing aid ( A dyeing solution containing 0.5 g/L of Disper TL (manufactured by Meisei Chemical Industry Co., Ltd.) was prepared, and the dyeing process was carried out at 120°C for 60 minutes at a bath ratio of the obtained polyester fiber and dyeing solution of 1:40. was carried out. After the dyeing treatment, a treatment solution containing 2.0 g/L of hydrosulfite, 2.0 g/L of Amiradin D (manufactured by Daiichi Kogyo Seiyaku Co., Ltd., trade name: Amiradin D), and 1.0 g/L of sodium hydroxide. was used to perform reduction cleaning at 80°C for 20 minutes at a bath ratio of 1:20, and after washing with water and drying, colored polyester fibers were obtained.The fibers were cut to the length shown in Table 1 to form fiber piles 15. Obtained.

(rayon fiber pile)
It was added and mixed to a viscose stock solution consisting of 9.0% by mass of cellulose, 5.6% by mass of sodium hydroxide, and Pigment Brown 25 to prepare a spinning stock solution. Using a nozzle with pores, the obtained spinning stock solution was extruded into a 40°C bath consisting of 60 g/l of sulfuric acid, 350 g/l of sodium sulfate, 15 g/l of zinc sulfate, and water for coagulation and regeneration, followed by washing with water and drying. As a result, rayon fibers having a fineness of 10 denier were obtained. The obtained rayon fiber was cut into a length of 1 mm to obtain a rayon fiber pile.

<Examples, comparative examples>
・Examples 1 to 7, Comparative Examples 1 to 8
With the formulation shown in Table 2, thermoplastic resin, pigment, fiber pile, and UV absorber 1 were processed using a twin-screw extruder with L/D = 42 at a processing temperature of 50 to 180°C and an extruder rotation speed of 150 rpm. A masterbatch was prepared by kneading and discharging the obtained kneaded material from a die.
To 1 part by weight of the obtained masterbatch, 10 parts by weight of a polypropylene resin (Novatec PP BC03B, manufactured by Nippon Polypro Co., Ltd.) was mixed as a diluting resin to prepare a molding material. From the obtained molding material, a molded article (resin plate: size: 80 x 50 mm, thickness 2 mm) was created.

・Example 8-9
With the formulation shown in Table 2, thermoplastic resin, pigment, fiber pile, and UV absorber 1 were processed using a twin-screw extruder with L/D = 42 at a processing temperature of 50 to 180°C and an extruder rotation speed of 150 rpm. A resin composition for coloring a molded object was prepared by kneading and discharging the obtained kneaded material from a die.
Using the obtained resin composition for coloring a molded object as a molding material, a molded object was formed by injection molding (equipment name: IS55EPN, manufactured by Toshiba Machinery Co., Ltd., mold temperature 40°C, cylinder temperature 200°C, injection speed 20 mm/sec). (Resin plate: size: 80 x 50 mm, thickness 2 mm) was created.

<Evaluation>
(Melting point of polyester fiber pile)
Using DSC (DSC8500 manufactured by PerkinElmer), the peak top temperature of the endothermic peak when the polyester fiber pile was heated from 25°C to 300°C at 20°C/min was measured as the melting point Tm. The results are shown in Table 1.

(diameter of polyester fiber pile)
The diameter of the polyester fiber pile was measured using an optical microscope (BX-51 manufactured by Olympus Corporation, 200 times), and the diameter of the fiber pile was determined from the average value of the 10 measured points. The results are shown in Table 1.

(Evaluation of dispersibility)
The surface of the obtained molded product was visually observed and evaluated based on the following criteria. The results are shown in Tables 2 and 3. ◎ is a passing level.
◎: No aggregates of fiber piles or long streaks of elongated fiber piles were observed, and the fiber piles were uniformly dispersed.
×: Aggregates of fiber piles that cannot be loosened are observed, or long lines of fiber piles are observed.

(Evaluation of three-dimensional effect)
Regarding the molded bodies whose dispersibility evaluation was at an acceptable level, the surface of the molded bodies was visually observed, and the three-dimensional effect was evaluated based on the following criteria. The results are shown in Tables 2 and 3 (those for which the stereoscopic effect was not evaluated are marked with "-"). The evaluation was conducted through discussion among five engineers who have been engaged in color development for three years or more. ◎ and ○ are passing levels.
◎: The sense of depth was extremely high.
○: The sense of depth was high.
×: The sense of depth was low.

(Heat resistance evaluation)
Heat resistance evaluation was performed on the molded product whose dispersibility evaluation was at a passing level.
Examples 1 to 7, Comparative Examples 1 to 4, and Comparative Examples 7 to 8 were prepared by mixing 1 part by weight of the masterbatch with 10 parts by weight of a polypropylene resin for dilution (Novatec PP BC03B, manufactured by Nippon Polypro Co., Ltd.). In addition, in Examples 8 and 9, the resin composition for coloring a molded object was charged as a molding material into an injection molding machine (equipment name: IS55EPN, manufactured by Toshiba Machine Co., Ltd., mold temperature 40 ° C., injection speed 20 mm/sec), After weighing with an injection molding machine, the resin was held in a cylinder at a temperature of 230° C. for 10 minutes and allowed to stay there, and then a molded article was produced in the same manner as described above. The surfaces of the created molded body and the molded body molded without stagnation were visually observed and evaluated based on the following criteria. The evaluation was conducted through discussion among five engineers who have been engaged in color development for three years or more. The results are shown in Tables 2 and 3 (those for which heat resistance evaluation was not performed are marked with "-"). ◎ is a passing level.
◎: No discoloration was observed.
x: The color changed to a different tone.

(Weather resistance test)
A weather resistance test was conducted on the molded articles whose dispersibility and three-dimensional effect evaluations were at an acceptable level. The obtained molded body was tested using an Eye Super UV tester (model name: SUV-W-161 manufactured by Iwasaki Electric Co., Ltd.) under the conditions of ultraviolet irradiance of 100 W/m2, black panel temperature of 83°C, and relative humidity of 50% by mass. An accelerated weathering test was conducted with an exposure time of 72 hours, and the discoloration of the molded product after the test was visually compared with a molded product that had not been subjected to the accelerated weathering test, and evaluated based on the following criteria. The results are shown in Tables 2 and 3. ◎ and ○ are passing levels.
◎: No discoloration was observed.
○: Slight discoloration was observed, but it was at a level that caused no practical problems.
x: Discoloration occurred, resulting in a different hue.

From the comparison of the results of Examples 1 to 9 and Comparative Examples 1 and 7, it was found that by containing two or more types of fiber piles of black + chromatic color or chromatic color + chromatic color in the colored resin composition for molded objects, It was found that a design with a three-dimensional effect can be obtained.

From a comparison of the results of Examples 1 to 9 and Comparative Example 2, it was found that when polyester fiber piles were used, the resin composition for coloring molded objects had excellent heat resistance without yellowing. Ta.

Further, from a comparison of the results of Examples 1 to 9 and Comparative Examples 3 and 4, it was found that a design with a three-dimensional effect can be obtained when the diameters of the two types of fiber piles are 25 to 80 μm.

Further, from the results of Comparative Example 5, it was found that when the fiber pile length exceeds 3 mm, the entangled fiber piles cannot be loosened during kneading and appear on the surface of the molded body as undispersed aggregates.

In addition, as a result of Comparative Example 6, it was found that there were places on the surface of the molded product where fiber piles were stretched in streaks of 5 mm or more, and if the melting point of the fiber piles was less than 240°C, they would soften due to shear heat during kneading or molding. It was found that the fiber pile was stretched into stripes, resulting in a molded product with poor dispersibility.

Further, from a comparison of the results of Examples 1 to 9 and Comparative Example 8, it was found that weather resistance was better when the fiber pile was colored with a pigment rather than a dye.

Table 1

Table 2

Table 3

Claims (8)

A thermoplastic resin containing a pigment, a first fiber pile containing a black, white or chromatic pigment, and a second fiber pile containing a chromatic pigment,
The first fiber pile and the second fiber pile are two types of polyester fiber piles with a diameter of 25 to 80 μm and a length of 0.1 to 3 mm and different hues ,
A resin composition for coloring a molded object , wherein the thermoplastic resin is a polyolefin resin . The resin composition for coloring a molded object according to claim 1, wherein the polyester fiber pile is a fiber pile made of either polyethylene terephthalate or polyethylene terephthalate copolymer. The resin composition for coloring a molded object according to claim 1 or 2, wherein the polyester fiber pile has a melting point of 240°C or higher. The resin for coloring a molded body according to any one of claims 1 to 3 , wherein the total content of the fiber pile is 0.1% by mass or more and 50% by mass or less based on the entire resin composition for coloring a molded body. Composition. The resin composition for coloring a molded object according to any one of claims 1 to 4 , further comprising an ultraviolet absorber. A molded object made using the resin composition for coloring a molded object according to any one of claims 1 to 5 . A masterbatch using the resin composition for coloring a molded object according to any one of claims 1 to 5 . A method for producing a molded body, comprising a step using the resin composition for coloring a molded body according to any one of claims 1 to 5 .