JP3417128B2 - Resin molding - Google Patents

Description

BACKGROUND OF THE INVENTION [0001] FIELD OF THE INVENTION The present invention, Ru is used in a car or exterior parts, related tree butter moldings that have a high gloss and impact resistance. [0002] Exterior parts such as bumpers and bumper corners used for automobiles are required to have high impact strength. Conventionally, as such an exterior component, a resin molded body has been used from the viewpoint of assemblability to an automobile, flexibility, strength, and the like. As the resin molded article, a resin modified article of rubber, polypropylene, EPM (ethylene propylene copolymer), and rubber-modified polypropylene composed of talc or the like has been used.
The surface of such a resin molded body has been given a solid tone or a metallic tone by painting. However, when a solid tone or a metallic tone is applied to the above-mentioned conventional resin molded article,
As mentioned above, painting was necessary. As a result, the manufacturing process could not be rationalized, resulting in higher costs. Therefore, in order to omit the coating process, it is conceivable to simply add a colorant such as a solid color pigment, a metal powder or a pearl pigment to the rubber-modified polypropylene. However, in this case, it is not possible to obtain the same gloss and metallic feeling as the paint. The reason is,
As shown in FIG. 2, the matrix 92 of the resin molded body 90 is formed.
In this case, it is considered that because the rubber-modified polypropylene 91 exists in a flat shape, the colorant 93 becomes a shadow of the rubber-modified polypropylene 91 and most of the light 95 does not hit the colorant 93. In order to improve the gloss, it is conceivable to reduce the rubber content of the rubber-modified polypropylene. However, in this case, there is a problem that the impact resistance of the resin molded article is significantly reduced. [0006] The present invention has been made in view such conventional problems, and a high gloss and metallic effect and deep feeling, and excellent in impact resistance, is intended to provide a tree fat moldings. SUMMARY OF THE INVENTION The present invention provides a 75 to 50% by weight of a crystalline ethylene / propylene block copolymer having an ethylene content of 2 to 15% by weight and a Rockwell hardness of 85 or more.
0 to 30 parts by weight of an inorganic filler with respect to 100 parts by weight of a basic component consisting of 25 to 50% by weight of an ethylene / α-olefin copolymer having an ethylene content of 80 to 95% by weight;
A colorant 0.1 to 10 parts by weight was added, formed by mixing wood
A resin molded product obtained by molding a resin composition into a desired shape.
Thus, the resin molded body has a surface with a permeability of 20 μm or more.
A clear layer is formed , and the above ethylene
The α-olefin component of the α-olefin copolymer is
Len, butene-1, pentene-1, hexene-1, octane
Ten-1,4-methylpentene-1 and heptene-1
One or more selected from the group
Characteristic resin molded article . In the present invention, the crystalline ethylene / propylene block copolymer has an ethylene content of 2 to 15% by weight and a Rockwell hardness of 85 or more. If the ethylene content is less than 2% by weight, the impact strength decreases. On the other hand, if it exceeds 15% by weight, there is a problem that the gloss, depth and metallic feeling of the resin molded product are reduced. When the Rockwell hardness of the crystalline ethylene / propylene block copolymer is less than 85, the gloss, depth, and metallic feeling of the resin molded product are reduced. Further, the crystalline ethylene / propylene block copolymer has an ethylene content of 2 to 12% by weight,
And it is preferable that Rockwell hardness is 90 or more. Thereby, the gloss, depth, and metallic feeling of the resin molded product can be further enhanced. [0010] The ethylene-α-olefin copolymer is
The ethylene content is 80-95% by weight. If it is less than 80% by weight, the feeling of depth and metallic feeling will be low. On the other hand, if it exceeds 95% by weight, there is a problem that high impact resistance cannot be maintained. The above ethylene─
The α─ olefin component in the α-olefin copolymer, up propylene, butene ─1, pentene ─1, hexene ─1, octene ─1,4─ methylpentene ─1, and one selected from the group of heptene ─1 Or two or more
The Ru used. The above-mentioned inorganic filler is used for the rigidity of the resin molded article,
It enhances strength and heat resistance. Examples of the resin molded body include, but are not limited to, glass fiber, talc, mica, calcium carbonate, wollastonite, clay, barium sulfate, potassium titanate whisker, magnesium sulfate whisker, calcium carbonate whisker,
And at least one selected from the group consisting of silica and silica. As the coloring agent, aluminum powder, aluminum flake, aluminum foil, pearl mica, zinc powder, bronze powder, glittering material such as glass flake, titanium white, zinc oxide,
Inorganic pigments such as zinc sulfide, red iron, chrome yellow, barium yellow, ultramarine, cobalt blue, cobalt green, or carbon black, watching red, permanent red, para red, toluidine maroon, benzidine yellow,
There is one or more selected from the group of organic pigments such as phthalocyanine blue, phthalocyanine green, fast sky blue, and brilliant carmine 6B. The coloring agent is arbitrarily selected from the above-mentioned brilliant, inorganic pigments, and organic pigments.
The above-mentioned inorganic pigment alone or the above-mentioned organic pigment alone can be used, but the above three can be used alone or in combination of two or more. When the amount of the crystalline ethylene / propylene block copolymer is less than 50% by weight with respect to 100% by weight of the above basic component, the gloss, depth feeling,
The metallic feeling is reduced. On the other hand, if it exceeds 75% by weight, the impact strength will be low. In 100% by weight of the above basic component, the ethylene─α-olefin copolymer contained 2%
If it is less than 5% by weight, the impact strength will be low. on the other hand,
If the content exceeds 50% by weight, the gloss of the resin molded product,
Depth and metallic feelings are reduced. If the amount of the inorganic filler exceeds 30 parts by weight with respect to 100 parts by weight of the basic component, gloss, depth and metallicity are reduced. When the amount of the coloring agent is less than 0.1 part by weight based on 100 parts by weight of the basic component, the coloring property and metallic feeling of the resin molded product are insufficient. On the other hand, if it exceeds 10 parts by weight, the gloss and the sense of depth are significantly reduced. It is preferable that a dispersant is added to and mixed with the resin molded article in order to prevent aggregation of the colorant. As such a dispersant, depending on the type of the colorant,
The one appropriately selected from general-purpose dispersants is used. The mixing ratio of the dispersant is based on 100 parts by weight of the above basic component.
Usually, it is preferably 0.01 to 2 parts by weight. In the present invention, the above-mentioned clear layer is a transparent layer having a thickness of 20 μm or more formed on the surface of the resin molded article, and contains no or very little colorant. In. When the thickness of the clear layer is less than 20 μm, a deep feeling and a metallic feeling cannot be obtained. In the resin molded body, the inside than the clear layer, that have the coloring agent is present dispersed. [0019] In the tree fat moldings of the operation and effect of the present invention, FIG. 1
As shown in (1), the crystalline ethylene / propylene block copolymer 2 constitutes a matrix of the resin molding 7. Further, the ethylene / α-olefin copolymer 1 is dispersed in the matrix. For this reason, the colorant 3 is distributed to a point slightly sinking from the surface layer due to a synergistic effect of a phenomenon of flowing slightly later than the resin component during molding and a phenomenon of sinking during cooling. [0020] Here, in the present invention, the upper Kiyui-crystalline ethylene-propylene block copolymer, a relatively fine rubber component particles of the block portion, and the crystal structure is dense. Further, the ethylene / α-olefin copolymer 1 having the above composition is substantially spherically dispersed. Therefore, the light 5 can enter the inside of the resin molded body 7 without being blocked by the ethylene / α-olefin copolymer 1. Then, the light is reflected by the colorant 3 dispersed inside. Therefore, more light can be reflected than before, and high glossiness and metallic feeling can be obtained. Further, the resin composition used for the resin molded article of the present invention is constituted by the above composition. for that reason,
A phenomenon occurs in which the colorant 3 flows slightly later than the resin component during molding, and a phenomenon in which the colorant 3 sinks during cooling. Due to a synergistic effect of the two, the colorant 3 sinks slightly from the surface layer of the resin molded article. Distributed at points. For this reason, a clear layer 4 having high transparency containing no or very little colorant 3 is formed on the surface layer. When such a resin molded body is irradiated with light, the light 5 passes through the clear layer 4 and is reflected by the colorant 3 therein. Therefore, the depth Mi feeling becomes more pronounced, thereby improving the metallic effect. Further, Oite the present onset bright because it contains a predetermined amount of the specific ethylene ─α olefin copolymer and a crystalline ethylene-propylene block copolymer, a high impact resistance. Next, the resin molded article of the present invention is composed of the above-mentioned composition, and has a clear layer having a depth of 20 μm or more. Therefore, as described above, the feeling of depth becomes remarkable, and the metallic feeling is improved. Further, since the ethylene / α-olefin copolymer is substantially spherically dispersed, high glossiness and metallic feeling can be obtained. Further, as described above, high impact resistance is obtained. According to the invention, and a high gloss and metallic effect and deep feeling, and it is possible to provide an excellent tree butter molded body impact resistance. EXAMPLES Examples 1 to 5 A resin molded product according to an example of the present invention will be described together with a comparative example. In this example, the depth, gloss, appearance of metallic appearance, and impact strength of the resin molded article were measured. In the measurement, test pieces having the compositions shown in Tables 4 and 5 were used. In both tables, the crystalline ethylene / propylene block copolymer (hereinafter referred to as PP) is:
Four types of PP-1 to PP-4 were used. The ethylene content and physical properties are shown in Table 1. In addition, as an ethylene @ α-olefin copolymer (hereinafter referred to as EO), EO-
Four types 1 to 4 were used. These ethylene contents are shown in Table 2. Talc having an average particle size of 2 μm was used as the inorganic filler. As shown in Table 3, carbon black, phthalocyanine blue, benzidine yellow, titanium oxide, and aluminum powder were used as coloring agents. And
These colorants are composed of the basic component 10 consisting of PP and EO.
A total of 2.3 parts by weight was added to 0 parts by weight and mixed.
Magnesium stearate was used as a dispersant.
This dispersant is added to 100 parts by weight of the above basic component,
0.5 parts by weight were added and mixed. The physical properties of PP shown in Table 1 are Rockwell hardness and melt flow rate (MFR). Rockwell hardness was measured on an R scale according to JIS K7207. MFR is based on JIS 6758,
The measurement was performed at a temperature of 230 ° C. and a load of 2160 g. The test piece was prepared by adding the resin composition to a size 1
It is formed into a flat plate having a size of 00 mm x 100 mm and a thickness of 3 mm. With respect to the test pieces, the visual appearance showing a feeling of depth and gloss, and an impact strength were measured by the following methods. (Depth feeling) A microscope capable of confirming the amount of vertical movement of the sample stage is used. First, a microscope is focused on the surface of a test piece to be observed, and the position of the sample table at that time is defined as an origin A.
Next, the sample stage is moved up and down, and the position of the sample stage when the deposited colorant cannot be identified, that is, when it becomes impossible to focus on the colorant is B. Then, the absolute value of the difference between the above A and B is obtained, and this is set as the movement amount ΔX of the sample table, and this value ΔX is set as the thickness of the clear layer. This value is used as an index of the depth of the test piece. (Appearance) Appearance was adopted as a measure of glossiness, especially metallicity. That is, by the naked eye,
The evaluation was made in three stages as follows. First class. . . Class 2 with a metallic feel similar to painted products. . . Class 3 with slightly less metallic feel than painted products. . . No metallic feeling (Impact strength) Determined by Izod impact strength. The above measurement results are shown in Tables 4 and 5. In both tables, “E” in the uppermost column indicates an example relating to the present invention, and “C” indicates a comparative example. Next, the measurement results of Tables 4 and 5 will be described. As can be seen from both tables, Examples E1 to E5 according to the present invention each had a clear layer having a thickness of 20 μm or more, and exhibited a deep metallic feeling. There was gloss and appearance was also high. The impact resistance was as high as 240 J / m or more. As shown in Table 4, Examples E1 and E
2. In Comparative Examples C1 and C2, EO was fixed and P
The type of P was changed. As a result, PP without ethylene
Comparative Example C1 using # 1 had a low impact strength. Comparative Example C2 using PP-4 having a Rockwell hardness of 70
Did not break. In Comparative Example C2, the thickness of the clear layer was thin, the metallic feeling was not felt, and the appearance was poor. This indicates that a resin molded article using PP having an ethylene content of 2 to 15% by weight and a Rockwell hardness of 85 or more has a large clear layer thickness and high impact strength. Then, as shown in Table 5, in Examples E3, E4 and Comparative Example C3, the ethylene content was 4.
PP- which is 4% by weight and has a Rockwell hardness of 98
The type of EO was changed using 2 in a fixed amount. As a result, EO- containing 91% by weight and 88% by weight of ethylene, respectively.
In Examples E3 and E4 using 2, EO-3, the thickness of the clear layer was as high as 32 μm and 29 μm, and both of them felt as metallic as high as a painted product. In Comparative Example 3 using EO-4 having an ethylene content of 75% by weight, the thickness of the clear layer was as small as 17 μm, and there was no metallic feeling. This indicates that the resin molded body using EO having an ethylene content of 80 to 95% by weight has a large sedimentation depth and exhibits a deep metallic feeling. Then, Example E5, Comparative Example C4,
In C5, the above-mentioned specific types of PP-2 and EO-1
These were used to change the mixing ratio. Example E5
Means that PP-2 and EO-
The compounding ratio with 1 was 55% by weight and 45% by weight, and this compound had remarkably high impact strength, and also had high depth and metallic feeling. On the other hand, in Comparative Example C4, EO-1 was small, and the impact strength was extremely low. Comparative Example C5
Means that the blending ratio of PP-2 and EO-1 is 45% by weight,
5% by weight, which did not break. Also,
There was little sense of depth. From the above, it can be seen that 2 to 15% by weight of a crystalline ethylene / propylene block copolymer having an ethylene content of 2 to 15% by weight and Rockwell hardness of 85 or more, and ethylene having an ethylene content of 80 to 95% by weight. Basic component 100 consisting of 25 to 50% by weight of α-olefin copolymer
0 to 30 parts by weight of an inorganic filler and 0.1 to 10 parts by weight of a coloring agent are added to the parts by weight, and according to the composition, a deep feeling and a metallic feeling are enhanced, and excellent impact strength is obtained. Is obtained. Also, the resin moldings
It can be seen that excellent effects are similarly exhibited. [Table 1] [Table 2] [Table 3] [Table 4] [Table 5]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of a resin molded product of the present invention. FIG. 2 is an explanatory view of a conventional resin molded body. [Explanation of Codes] . . 1. ethylene-α-olefin copolymer, . . 2. crystalline ethylene / propylene block copolymer; . . Colorant, 4. . . Clear layer, 5. . . Light, 7. . . Resin molding,

Continuation of the front page (56) References JP-A-6-9852 (JP, A) JP-A-5-98128 (JP, A) JP-A-5-98129 (JP, A) JP-A-5-59251 (JP, A) , A) JP-A-5-98127 (JP, A) JP-A-5-98126 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08L 53/00 C08L 23/16

Claims (1)

(57) [Claims] An ethylene content of 2 to 15% by weight and
Crystalline ethylene propylene with a Rockwell hardness of 85 or more
75 to 50% by weight of unblock copolymer and ethylene content
80 to 95% by weight of ethylene-α-olefin copolymer
100 parts by weight of the basic component consisting of 25 to 50% by weight
And 0 to 30 parts by weight of inorganic filler and 0.1 to 10 parts of colorant
Add the parts and mixChange the resin composition to the desired shape
A resin molded body formed into The resin molding has a transparent surface having a depth of 20 μm or more on its surface.
A clear layer is formed, In addition, α-olefin of the above ethylene-α olefin copolymer
The components are propylene, butene-1, pentene-1,
Hexene-1, octene-1,4-methylpentene-
One selected from the group consisting of 1, and heptene-1 or
Resin moldings of two or more types .