JPH08239527A - Highly glossy resin composition and resin molding - Google Patents

Abstract

PURPOSE: To obtain a highly glossy resin composition having high metallic feeling and glossy feeling and to obtain a resin molding produced by using the composition. CONSTITUTION: This resin composition is obtained by adding 100 pts.wt. of a polypropylene resin having <=20wt.% of a xylene-soluble portion with 0.1-3 pts.wt. of a brightening agent 1 having an average major diameter of >=5μm and blending the mixture. The average major diameter of the brightening agent 1 is preferably <=500# m. A resin molding 7 obtained by molding the resin composition into a desired shape has a transparent clear layer 4 having a depth of >=25μm on its surface, and particles of the brightening agent 1 are dispersed in the region inner than the clear layer 4. The brightening agent is preferably a metallic powdery pigment, a pearl pigment, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition used for exterior parts of automobiles, and more particularly to a high-gloss resin composition having a high metallic and glossy feeling and a resin molded product using the same.

[0002]

2. Description of the Related Art Exterior parts such as bumpers and bumper corners used for automobiles are required to have extremely high impact strength. Conventionally, as such exterior parts, resin molded bodies have been used from the viewpoints of assembling to automobiles, flexibility, strength and the like.
As the resin molded body, a resin molded body composed of a polypropylene-based composite material has been used.

[0003]

[Problems to be Solved] However, when a metallic tone is applied to the above-mentioned conventional resin molded body, the coating treatment is required as described above. Therefore, the manufacturing process could not be rationalized, resulting in higher costs. Therefore, in order to omit the coating process, it is conceivable to add a glitter material or the like to the above polypropylene-based composite material. However, in this case, the same gloss and metallic feeling as the painting cannot be obtained,
It also looks bad.

In view of such conventional problems, the present invention is to provide a high-gloss resin composition having a high metallic feeling and a high gloss feeling, and a resin molding using the same.

[0005]

According to the present invention, 0.1 to 3 parts by weight of a bright material having an average major axis of 5 μm or more is added to 100 parts by weight of a polypropylene resin having a xylene-soluble content of 20% by weight or less,
A high-gloss resin composition characterized by being mixed.

In the present invention, the xylene-soluble component in the polypropylene resin is 20% by weight or less. If it exceeds 20% by weight, there is a problem that the metallic feeling and gloss are lowered. The polypropylene resin preferably has a Rockwell hardness (R scale) of 85 or more. This further improves the metallic feel and gloss.

The polypropylene resin has an average major axis of 5
A glittering material of μm or more is added and mixed. The glittering material having such an average major axis causes a sedimentation phenomenon in the softened polypropylene resin at the time of molding the resin molded body, and thus forms a transparent clear layer on the surface of the resin molded body. Therefore, the resin molding has a high depth and metallic feeling. When the average major axis of the luster material is less than 5 μm,
Sedimentation is unlikely to occur, no clear layer is formed on the surface,
The depth and metallic feeling are reduced.

Further, the average major axis means the average length L of the long piece 10 in the glitter material 1, as shown in FIG.
Most of the glittering materials have a flat plate shape (Fig. 2 (A)), a rod shape (Fig. 2 (B)), and a scaly shape. Therefore, in the present invention, the size of the shape is determined by the average major axis. Stipulated. The average major axis of the glitter material is preferably 500 μm or less in terms of design. If it exceeds 500 μm, each grain of the glittering material becomes too conspicuous, and the appearance of the resin molded body becomes poor.

As the glittering material, it is preferable to use one or more selected from the group consisting of metal powder pigments and pearl pigments. Examples of metal powder pigments include aluminum powder, aluminum flakes, aluminum foil, zinc powder, bronze powder, and stainless powder. As the pearl pigment, there are transparent pearl mica, interference mica and the like. In addition to the glittering materials other than the above, glass flakes can be used alone or in combination.

The glitter material is the polypropylene resin 1
It is added in a proportion of 0.1 to 3 parts by weight with respect to 00 parts by weight. If the amount is less than 0.1 parts by weight, or if the amount exceeds 3 parts by weight, satisfactory metallic feeling and depth feeling cannot be obtained.

Further, the above high-gloss resin composition may further contain a coloring material. This makes it possible to obtain resin moldings having various colors. Coloring agents include titanium white, zinc oxide, zinc sulfide, red iron oxide, chrome yellow, barium yellow, ultramarine blue, cobalt blue, cobalt green, carbon black, and other inorganic pigments, or watching red, permanent red, para red, toluidine maroon, benzidine. Organic pigments such as yellow, phthalocyanine blue, phthalocyanine green, fast sky blue, and brilliant carmine 6B can also be used.

Next, as a resin molding using the above high-gloss resin composition, for example, a luster pigment having an average major axis of 5 μm or more with respect to 100 parts by weight of a polypropylene resin having a xylene-soluble content of 20% by weight or less. A resin molded body obtained by molding a resin composition obtained by adding 0.1 to 10 parts by weight to a desired shape, the resin molded body having a transparent clear layer having a thickness of 25 μm or more on the surface thereof. And a resin molded body characterized in that the glittering material is dispersed inside the clear layer.

The clear layer is a transparent layer formed on the surface of the resin molded body and having a thickness of 25 μm or more, and does not contain a glittering material. That is, the clear layer contains no or very little glitter. When the thickness of the clear layer is less than 25 μm, the depth feeling,
No metallic feel.

In the resin molded body, the glittering material is dispersedly present inside the clear layer.
The resin composition used for the resin molded product of the present invention is the same as the high gloss resin composition described above.

[0015]

FUNCTION AND EFFECT The high-gloss resin composition of the present invention is a mixture of the above-mentioned specific polypropylene resin and a specific glittering material. Therefore, when a resin molded body is molded using this high-gloss resin composition, the polypropylene resin 2 constitutes the matrix of the resin molded body 7, as shown in FIG. The glitter material 1 is dispersed and present in the polypropylene resin 2. The glitter material 1 causes a sedimentation phenomenon in the softened polypropylene resin,
The resin molded body 7 moves from the surface to the inside. Therefore, a transparent clear layer 4 containing no glitter material is formed on the surface of the resin molded body 7, while a layer in which the glitter material 1 is dispersed is formed inside.

Therefore, the light 5 passes through the transparent clear layer 4 and enters the inside thereof. Then, the light 5 is reflected inside by the glittering material 1. Therefore, the resin composition of the present invention has a more prominent sense of depth and improves gloss and metallic feel.

Next, the resin molded product of the present invention is composed of the above high-gloss resin composition, and the glittering material 1 is dispersed inside the clear layer 4 having a thickness of 25 μm or more. . Therefore, as described above, the light 5 is reflected inside the resin molded body 7, and the depth feeling becomes remarkable.
In addition, the gloss and metallic feeling are improved.

According to the present invention, it is possible to provide a high-gloss resin composition having a high gloss and metallic feel, and a resin molded product using the same.

[0019]

【Example】

Examples 1 to 9 High gloss resin compositions according to examples of the present invention will be described together with comparative examples. In this example, the depth and metallic feeling of the resin molded product were evaluated. When evaluating
A test piece formed by molding a resin composition obtained by adding and mixing a glittering material and a coloring material to polypropylene resin was used. The composition of the resin composition is shown in Tables 1 to 3. In the table,
As the polypropylene resin, four kinds of PP-1 to 4 were used. The xylene-soluble content of PP-1 to 4 was 0 respectively.
% By weight, 8.4% by weight, 17.0% by weight and 22.0% by weight. The Rockwell hardness (R scale) of PP-1 to 4 is 113, 98, 96 and 70, respectively.

As the glittering material, six kinds of M-1 to 6 were used. As shown in Tables 1 to 3, M-1 to M-6 were added and mixed in various mixing ratios with respect to 100 parts by weight of the polypropylene resin. In this luster material, M-
1,2,3,4 are average major axis 21μm, 14μ respectively
Aluminum powder of m, 3 μm, 11 μm and 110 μm.
M-6 is pearl mica having an average major diameter of 19 μm.

As shown in Tables 1 to 3, the colorant was added and mixed in a total amount of 1.3 parts by weight with respect to 100 parts by weight of the polypropylene resin. The composition ratio of various coloring materials is as follows: 100 parts by weight of polypropylene resin, 0.2 parts by weight of carbon black, 0.3 parts by weight of phthalocyanine blue, 0.1 parts by weight of benzidine yellow, 0.2 parts by weight of titanium oxide, stearin. The amount of magnesium oxide is 0.5 part by weight, and the total weight ratio thereof is 1.3 parts by weight as described above.

The above test pieces were formed by injection molding the above composition. The test piece has a size of 150 mm x 150
It is a flat plate having a thickness of 3 mm and a thickness of 3 mm. For the above test piece,
The depth feeling and metallic feeling were measured by the following methods.

(Sense of depth) A microscope capable of confirming the amount of vertical movement of the sample table is used. First, the microscope is focused on the surface of the test piece that is the observation object, and the position of the sample table at that time is set as the origin A. Next, the sample table is moved up and down to focus on the deposited glittering material, and the position of the sample table at that time is set to B. Then, the absolute value of the difference between 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 sinking depth of the glittering material. ΔX indicates the thickness of the transparent clear layer in which no luster colorant is present, and this value ΔX is used as an index of the feeling of depth of the test piece.

(Metallic Feeling) The evaluation was made with the naked eye in the following three grades. Level 1. ． ． It has a metallic feel similar to that of painted products. ． ． A little inferior metallic feeling compared to painted products. ． ． Those without metallic feeling

The above measurement results are shown in Tables 1 to 3. In the same table, "E" in the uppermost column means an example, and "C" means a comparative example.

As can be seen from the table, all of Examples E1 to E9 according to the present invention have a deposition depth of 31 to 44 μm.
m, and a satisfactory metallic feeling was obtained.

Further, as shown in Table 1, Examples E1 to E
3, In Comparative Example C1, the blending ratio of the specific glitter material was changed with respect to the specific amount of polypropylene resin. Four
In Comparative Example C1 to which the weight part of the luster color material was added, the deposition depth was shallow. Also, the metallic feeling was low. From this, it is understood that the addition amount of the glittering material to 100 parts by weight of polypropylene is preferably 3 parts by weight or less.

Next, as shown in Table 2, Examples E4 to E4
7. In Comparative Example C2, the type of glitter material was changed. In this case, the average major axis of aluminum powder or pearl mica is 5μ.
When it was more than m, the sedimentation depth became large and the metallic feeling became high. In Comparative Example C2 using an aluminum powder having an average major axis of 3 μm, the sedimentation depth was shallow and a satisfactory metallic feeling was not obtained. From this, it is understood that it is preferable to use aluminum powder or pearl mica having an average major axis of 5 μm or more as the glittering material.

Next, as shown in Table 3, Examples E8 and E
9. In Comparative Example C3, the xylene-soluble content of the polypropylene resin was changed, and the type and blending ratio of the glitter material were kept constant. When xylene-soluble content was increased, the settling depth of the brightening material became shallower and the metallic feeling was not felt. Particularly, in Comparative Example C3 using a polypropylene resin having a xylene-soluble content of 22.0% by weight, no metallic feel was felt. From this, it is understood that the xylene-soluble content of the polypropylene resin is preferably 20% by weight or less.

From the above measurement results, the xylene-soluble component is 2
According to the high-gloss resin composition prepared by adding 0.1 to 3 parts by weight of the luster material having an average major axis of 5 μm or more to 100 parts by weight of the polypropylene resin of 0% by weight or less, a high depth feeling and a metallic feeling can be obtained. It is understood that the resin molding having the above can be obtained.

[0031]

[Table 1]

[0032]

[Table 2]

[0033]

[Table 3]

[Brief description of drawings]

FIG. 1 is an explanatory view of a resin molded body of the present invention.

FIG. 2 is a perspective view of a flat plate-shaped glitter material (A) and a rod-shaped glitter material (B) in the present invention.

[Explanation of Codes] ． ． Luster material, 2. ． ． Polypropylene resin, 4. ． ． Clear layer, 5. ． ． Light, 7. ． ． Resin molding,

Claims (4)

[Claims] 1. To 100 parts by weight of a polypropylene resin having a xylene-soluble content of 20% by weight or less, 0.1 to 3 parts by weight of a glitter material having an average major axis of 5 μm or more is added and mixed. High gloss resin composition. 2. The high-gloss resin composition according to claim 1, wherein the glittering material is one or more selected from the group consisting of metal powder pigments and pearl pigments. 3. An average major axis is 5 μm with respect to 100 parts by weight of a polypropylene resin having a xylene-soluble content of 20% by weight or less.
A resin molding obtained by molding the resin composition obtained by adding 0.1 to 10 parts by weight of the above-mentioned luster material and mixing the resin composition into a desired shape, the resin molding having a thickness of 25 μm or more on its surface. A resin molded product having a transparent clear layer, wherein the glittering material is dispersed inside the clear layer. 4. The resin molded body according to claim 3, wherein the glittering material is one or more selected from the group consisting of metal powder pigments and pearl pigments.