JP2002088252A - Member for vehicle and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a member for a vehicle which exhibits brilliance and a metallic feeling combined with high designedness and tastefulness by incorporating a brilliant material and is prevented from deterioration in external appearances caused by separation of the brilliant material by incorporating an acid-modified olefinic resin, and to provide its manufacturing method. SOLUTION: In preparing a mixture comprising a thermoplastic resin, a pigment and a brilliant material as starting materials, the amount of the brilliant material to be added is set to 0.5-10 pts.wt. based on 100 pts.wt. of the thermoplastic resin and further 0.5-5 pts.wt. of an acid-modified olefinic resin having an acid value ranging from 20 to 70 are added. This mixture is subjected to extrusion molding by means of an extruder provided with a barrier flight type screw.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle member and a method of manufacturing the same, and more particularly, to an extruded product of a vehicle member having a luminous property and exhibiting a metallic feeling, and to suitably manufacture the vehicle member. And possible methods.

[0002]

2. Description of the Related Art In recent years, there has been an increasing need for vehicular members such as exterior malls having the same color as the body color of automobiles.
As for the exterior molding, polyvinyl chloride (P
VC) or the like, as a base material, by using a material coloring material obtained by mixing a coloring material that performs a predetermined coloring on the base material, or by applying a predetermined coloring paint after the base material is manufactured. It is colored.

Of the above-mentioned coloring methods, the method using a material coloring material mixed with a predetermined coloring material is limited to the use of a dark color system from the viewpoint of weather resistance. It is carried out by coating of paint. However, since the coating treatment is performed separately after the formation of the base material, the production cost is increased, and a large amount of a solvent is used in the treatment, and problems such as environmental load due to difficulty in recycling are pointed out. ing.

On the other hand, due to recent diversification of hobbies, not only monochromatic colors but also vehicular members to which a luminance material such as mica or aluminum is added in addition to a normal coloring material so as to exhibit glitter, for example. Demand is growing.

[0005]

As a method for obtaining the above-mentioned brilliant vehicle member without coating, that is, from a material coloring material, there are a method by injection molding and a method by extrusion molding. However, in the case of the injection molding, it is pointed out that a weldability mark, a flow mark, or the like deteriorates the design property and lowers the product perfection. This is because, due to the large particle size of the brightness material exhibiting the brilliancy, the brightness material itself is disturbed in the orientation and segregates unevenly.

On the other hand, in the case of extrusion molding, the above-mentioned phenomena such as weld marks and flow marks do not occur. However, depending on the amount of the luminance material added, irregular colored irregularities, so-called aggregates, are generated on the finished product surface. As a result, the appearance is greatly reduced. In particular, when the color is light-colored, the mixing amount increases because the luminance material also exerts the concealing property, and as a result, the appearance is further deteriorated.

[0007] The generation mechanism of the aggregate will be described with reference to FIG. The agglomerates are generated in the plasticizing melting region M of the full flight type screw 52 which is installed inside the extruder (50) and connected to a driving source (not shown) to generate a driving force for mixing and extruding various raw materials. I understood. From this, the material coloring material containing the luminance material (60) was extruded.
(50) When plasticizing and melting inside, a high pressure (about 50 MPa) generated in the melting region M by rotation of a generally used full flight type screw (52) causes the base material to be coated on a dispersant or the like. Luminescent material with solid components dispersed in the material
It is inferred that (60) is separated from the liquefied base material and is left behind (see FIG. 3A). This separation can occur very easily due to the small interfacial energy due to the shape (large particle size and small surface area) of the luminance material 60.

Further, the separation of the luminous material (60) is caused continuously in the melting region M under a relatively gentle flow generated by the full flight screw (52). As a result, on the surface of the screw (52) serving as the melting region M, the separated luminance material (60) aggregates to form a deposited layer (62) (see FIG. 3B). . When this deposited layer 62 grows and exceeds a certain size, the substrate
The frictional resistance of the (thermoplastic resin) exceeds the bonding strength of the deposited layer (62), and the bonding is broken.
As a result, the pieces of the unbonded sedimentary layer (62) become aggregates (6).
4) and is mixed into the product (Fig. 3
(See (c)).

In order to prevent the formation of the agglomerates (64), examinations and tests of temperature adjustment and discharge speed adjustment in extrusion molding were conducted. And it was difficult to bring the finished product to a practical level.

The use of PVC, which has been generally used as the thermoplastic resin as a base material, is being reduced because chlorine contained therein may be a factor in generating dioxin depending on the treatment after disposal. Therefore, the PVC
It has been considered that an olefin resin is used in place of the above. In this case, in order to exhibit the same brilliancy and shielding properties, it has been found that a larger number of luminance materials are required than PVC. Therefore, when an olefin-based resin is used instead of the PVC, the appearance may be further deteriorated.

The present invention has been proposed in view of the above-mentioned drawbacks inherent in the prior art, and has been proposed in order to solve the problem in a favorable manner. Provided is a vehicle member which exhibits a metallic feeling, has both high designability and taste, and prevents deterioration in appearance due to separation of the luminance material by containing an acid-modified olefin resin, and a method of manufacturing the same. The purpose is to:

[0012]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems and achieve the intended object, a glittery vehicle member according to the present invention comprises a mixture containing a thermoplastic resin, a pigment and a luminance material. In a vehicle member obtained by extrusion molding, the mixture contains 0.5 to 10 parts by weight of a luminance material and 100 to 100 parts by weight of a thermoplastic resin, and further has an acid value of 20 to 100 parts by weight.
A mixture containing 0.5 to 5 parts by weight of an acid-modified olefin resin in the range of 70 is used.

In order to overcome the above-mentioned problems and achieve the intended object, a method for manufacturing a glittering vehicle member according to another invention of the present application uses a mixture containing a thermoplastic resin, a pigment and a luminance material. An acid-modified olefin resin containing 0.5 to 10 parts by weight of a luminance material and having an acid value of 20 to 70 with respect to 100 parts by weight of the thermoplastic resin.
The mixture containing 5 to 5 parts by weight is extruded using an extruder equipped with a barrier flight type screw.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, with respect to a vehicle member and a method for manufacturing the same according to the present invention, typical ones will be described in each of the embodiments described later, and constituent elements and the like which can be selected in carrying out the present invention. Will be described in detail below with reference to the drawings. The inventor of the present application has proposed that by mixing an acid-modified olefin-based resin with a thermoplastic resin containing a luminance material, separation of the luminance material during extrusion molding can be prevented, and the thermoplastic resin containing the luminance material can be densified. The present inventors have found that a vehicular exterior component having a brilliant property can be suitably manufactured by using a barrier type screw as a screw for an extruder while enhancing the goodness.

As shown in FIG. 1, a vehicle member (10) according to the present invention has a core portion made of a metal or the like constituting the core member.
(12) and a skin material (14) covering the core portion (12) and having a predetermined color tone. The skin material (14) is composed of a thermoplastic resin (20) as a base material, a pigment (22) for adjusting the color tone, and a luminance material (2) which exhibits a glitter and exhibits a desired metallic feeling.
4) It is manufactured by extrusion molding from a dispersant, an acid-modified olefin resin, and the like. Here, vehicle members (10)
A typical side molding is given as an example, but other long moldings, such as a roof molding and a protect molding, which are required to have a design property.

The vehicle member (10) is manufactured through an adjusting step S1, an extruding step S2 and a finishing step S3 as shown in FIG. The adjusting step S1 is a step of adding various additives to a required thermoplastic resin (20) to obtain an adjusted product.

The core 12 which retains the shape of the vehicle member 10 and exhibits a predetermined mechanical strength is made of various metals such as stainless steel or various hard resins such as acrylonitrile butadiene styrene (ABS). Formed from If the extrudable resin is used as the core 12 here, it can be manufactured at a time together with a skin material 14 described later using a two-color molding method. In this case, the core material
A certain degree of compatibility is required between the raw material (12) and the thermoplastic resin (20) (described later), which is the main raw material of the skin material (14). The skin material (14) which covers the core portion (12) and exhibits a predetermined color tone and metallic feeling is generally 0.5 to 0.5.
It is set to be about 1 mm.

Examples of the thermoplastic resin (20) include polypropylene, polyethylene, ionomer, ethylene vinyl acrylate (EVA), and ethylene ethyl acrylate (EEA). Among these, polypropylene-based resins are most preferred in view of processability, recyclability and cost. In addition, by containing an elastomer component such as an olefin-based elastomer or a styrene-based elastomer, appearance, color development, weather resistance, durability, and scratch resistance can be improved. Instead of the thermoplastic resin (20), the thermoplastic resin is compositionally used.
A so-called thermoplastic resin composition containing a predetermined amount of (20) can also be used.

As the pigment (22), an organic pigment, an inorganic pigment, or an inorganic filler such as talc, calcium carbonate or barium sulfate, which can change the texture in appearance, can be used. In order to impart weather resistance to these pigments (22), additives for plastics such as antioxidants or ultraviolet absorbers may be added. The amount of the pigment (22) added,
Although it varies depending on the type and color tone, about 0.01 to 10 parts by weight is preferable in order to exhibit concealing properties as the skin material (14).

As the luminance material (24), natural mica,
Inorganic luminance materials such as synthetic mica, treated mica coated with titanium oxide and iron oxide and glass flakes, and metal-based materials such as aluminum flakes, aluminum paste, colored aluminum foil pieces, copper, wrought metal powder and metal plating powder A single or a plurality of luminance materials are used. The brightness material
The amount of (24) to be added may be
In order to give (10) the required metallic feeling, 0.5
It is preferable that the amount is not less than 10 parts by weight. If the amount is less than 0.5 part by weight, the metallic color tone and the required hiding power cannot be obtained. If the amount is more than 10 parts by weight, material processing becomes difficult, production efficiency decreases, and a rough feeling is generated. This is because the design property is reduced.

Examples of the dispersant include fatty acid metal salts such as stearate or oleate such as magnesium, calcium, zinc, aluminum and lithium, fatty acid amides, fatty acid esters, and olefin waxes such as polyethylene and polypropylene. Etc. are used singly or plurally.

As a method for mixing the dispersant, it is sufficient to simply add the dispersant during the adjusting step S1.
For (22), it is preferable to mix them in advance, pulverize them with an atomizer or a microanalyzer, and then mix them with other substances. For the luminance material (24), a dispersant that is effective only by mixing is used because the particle size changes due to the pulverization process, and the particle size causes a difference in glitter.

The amount of the dispersant added depends on the type and particle size of the pigment (22) and the amount added to the thermoplastic resin (20), but generally 100 parts by weight of the pigment (22). Is preferably 1 to 300 parts by weight. When the mixing amount is 1 part by weight or less, the effect as a dispersing agent is small and causes poor dispersion. When the mixing amount is excessive, the dispersibility is improved while the physical properties or weather resistance of the completed vehicle member (10) at the time of completion. In some cases, the metal mold used in the extrusion step S2 described below may be soiled, or powder may be wiped on the surface to impair the appearance. Also, 1 to 50 parts by weight is suitable for 100 parts by weight of the luminance material (24). However, as the mixing amount of the dispersant is larger, the separation of the luminance material (24) component during the extrusion step S2 to be described later is promoted and the aggregation is more likely to occur.
It is preferable that the amount of the dispersant added is the minimum necessary.
It should be noted that the treatment of a coupling agent such as a titanium-based or silane-based agent generally performed to enhance the compatibility of the inorganic filler with the thermoplastic resin (20) to the luminance material (24) may have other effects. Does not cause any problem.

As the acid-modified olefin resin, those having an acid value of 20 or more and less than 70, preferably 30 or more and less than 60 are used. This acid-modified olefin resin is
Since it has a low-polarity resin component and a high-polarity acid-modified component, it functions to increase the affinity between the thermoplastic resin (20) and the luminance material (24). The number average molecular weight is 1
If it is less than 000, it is more effective because it also has a function as a wax-based dispersant. For this reason, the uniform dispersibility of the luminance material (24) and the adhesion between the thermoplastic resin (20) and the luminance material (24) are enhanced, and the extrusion step S described later is performed.
2 has an effect of suppressing separation of the two. Instead of the acid-modified olefin resin, a so-called acid-modified olefin resin composition containing a predetermined amount of the acid-modified olefin resin in composition can also be used.

However, when the acid value is less than 20, the luminance material
The effect of preventing separation of (24) and the thermoplastic resin (20) is small, the effect of suppressing aggregation is weakened, and when the acid value is 70 or more, the reactivity with a dispersing agent such as a fatty acid metal salt increases, The dispersibility of the pigment (22) and the luminance material (24) in the extrusion step S2 described below is reduced, and as a result, the design of the finished product is greatly reduced. The pigment
As a method of maintaining the dispersibility of (22) and the luminance material (24), increasing the amount of the dispersant may be considered.
Attention must be paid to the fact that the melt viscosity during the extrusion process is reduced, which promotes the separation of the luminance material (24) component and promotes the occurrence of aggregation.

The addition amount of the acid-modified olefin resin is as follows:
The amount is preferably 0.5 or more and less than 5 parts by weight based on the thermoplastic resin (20). If the addition is less than 0.5 part by weight, the effect of preventing separation is small. If the addition is more than 5 parts by weight, the color tone is affected, the melt viscosity is reduced, and the durability of the vehicle member (10) is reduced.

The extrusion step S2 performed after the adjustment step S1 is a step of extruding the adjusted product obtained in the adjustment step S1 into a required shape by extrusion molding. Main extrusion stage S
In 2, the mixture is kneaded and kneaded, and then the mixture is extruded into a required shape.
The two operations can be performed using a single extruder.

In addition to the method described above, the mixture is mixed and kneaded using a first extruder, pelletized to obtain pellets, and then the pellets are formed using a second extruder. A method of extruding to a required shape can also be adopted. This method is suitably used when a two-layer extrusion molding machine or the like is used, or when the core material (12) and the skin material (14) are molded at one time by a two-color extrusion method.

By going through both steps S1 and S2, a desired vehicle member (10) can be obtained. The final finishing step S3 is performed by the vehicle member (10).
Are subjected to various processes such as washing, drying, and final processing, as well as predetermined inspection, to obtain a final product. When only the skin material (14) is extruded in the extrusion step S2, the skin material (14) and the core material (12) are joined by an adhesive or the like in the final finishing step S3, and thereafter, Processing such as water washing, drying and final processing and predetermined inspection are performed.

[0030]

Next, the present invention will be described in detail with reference to examples and comparative examples. However, the present invention is not limited to these examples, but has a wide range of application. All parts and percentages in Examples and Comparative Examples are described on a weight basis.

Examples 1 to 3 and Comparative Examples 1 and 2
As the thermoplastic resin, a styrene-ethylene-butylene-styrene resin-containing polypropylene formulated with a weathering stabilizer such as an antioxidant and an ultraviolet absorber, and as the pigment, Pigment 1
A general-purpose color pigment obtained by mixing 25 parts by weight of aluminum stearate as a dispersing agent with 00 parts by weight and then subjecting it to a crushing treatment is used as a luminance material, and has a particle size of 30 to 100 μm.
m-titanium-coated mica, magnesium stearate as a dispersing agent, and an acid value of 4 as an acid-modified olefin resin.
3. Maleic anhydride-modified polypropylene having a number average molecular weight of 8000 was mixed at a mixing ratio shown in Table 1 to obtain a mixture (mixing step S1). Next, this mixture was mixed and kneaded using a single screw extruder as a first extruder described below, pelletized by pelletizing cut, and a two-layer type equipped with a barrier type screw as a second extruder. Using an extruder (φ50 mm, L / D = 125), a skin material covering the core material made of stainless steel was extruded to obtain a molding molding as a vehicle member (extrusion step S2). Then, various processes were performed on the finally obtained molding mall to obtain a finished product (finish stage S3). The obtained moldings were evaluated for each of various items described below and for productivity. The results are shown in Table 2 below. As for the molding formed from the composition according to the present invention, the evaluation and productivity of each item were good.

[0032]

[Table 1]

The contents of various evaluation items and productivity,
The evaluation method and evaluation criteria are as follows. Content and method of evaluation The color tone, metallic feeling, dispersibility of the luminance material, hiding power, and occurrence of aggregates were visually evaluated. The color tone and the metallic feeling were evaluated by comparison with a standard color plate coated product as a standard. Regarding the evaluation of the aggregate, the size and the number of the aggregate were evaluated. Then, the productivity was evaluated from the defect rate taking into account these individual evaluations comprehensively.

The above-mentioned various evaluation items and productivity evaluation criteria are as follows. Item evaluation criteria ○: No problem level △: Somewhat problematic, but usable level ×: Large problem, unusable level Productivity evaluation criteria ◎: Level that can be produced without any problems ○: Design Slightly inferior, but producible level △: Rejection rate is a little high and production is uneasy ×: Rejection rate is high and production is impossible

[0035]

[Table 2]

In Comparative Examples 3 and 4, the basic composition was the same as that of Comparative Example 1 and Example 2 except that the acid value of the acid-modified olefin resin was 43 and the number average molecular weight was 80.
From a mixture without the addition of maleic anhydride-modified polypropylene of No. 00, that is, a mixture in which each composition was mixed at the mixing ratio shown in Table 3 below, a finished product of a molding molding was obtained by the method described in [0031] above. The results of the obtained molding are shown in Table 4 below. In the case of the luminance material content of 1.5 parts by weight (Comparative Example 3), almost no change due to the presence or absence of the acid-modified resin was observed. It has been found that if the content of the luminance material is of the order, it is possible to sufficiently cope with only the screw of the extruder. 3 parts by weight of the luminance material (Comparative Example 4)
In the case of (1), when no acid-modified olefin-based resin was present, the generation of aggregates was obvious. However, it was confirmed that the addition of the acid-modified resin resulted in a problem-free level. In addition, the content of various evaluation items and productivity, the evaluation method, and the evaluation standard conformed to [0032] and [0033] described above.

[0037]

[Table 3]

[0038]

[Table 4]

Examples 4 and 5 and Comparative Examples 5 and 6
Is a composition obtained by changing the blending amount of maleic anhydride-modified polypropylene having an acid value of 43 and a number-average molecular weight of 8,000 based on the composition of Example 1 described above, that is, From the mixture mixed at the mixing ratio shown in Table 5, a finished product of the molding molding was obtained by the method described in [0031] above. The results of the moldings thus obtained are shown in Table 6 below. As for the moldings produced from the composition according to the present invention, the evaluation and productivity of each item were good. In addition,
The contents of various evaluation items and productivity, the evaluation method, and the evaluation criteria were in accordance with [0032] and [0033] described above.

[0040]

[Table 5]

[0041]

[Table 6]

Examples 6 to 8 and Comparative Examples 7 and 8
Based on the composition of Example 1 described above, the type of acid-modified olefin-based resin, that is, the above-mentioned maleic anhydride-modified polypropylene having an acid value of 43 and a number average molecular weight of 8,000 was replaced with an acid of a different acid value, number average molecular weight or plastic type. By using the modified olefin resin, a finished product of the molding molding was obtained from the mixture mixed at the compounding ratio shown in Table 7 below by the method described in the above [0031]. And the result about the obtained molding molding is described in Table 8 below,
For molding molding made from the composition according to the present invention,
The evaluation and productivity for each item were good. The contents of various evaluation items and the productivity, the evaluation method and the evaluation standard are described in [0032] and [003].
3].

[0043]

[Table 7]

[0044]

[Table 8]

In Comparative Examples 9 and 10, the compositions of Examples 2 and 1 described above, that is, the compositions obtained by mixing the respective compositions at the mixing ratios shown in Table 9 below were used as the respective compositions. ], The screw type equipped in the two-layer extruder (φ50 mm, L / D = 125) used as the second extruder in the extrusion step S2 is changed from the barrier type to the full flight type. And the finished product of the molding mall was obtained. The results of the moldings obtained are shown in Table 10 below. The moldings not produced by the production method according to the present invention, that is, the moldings produced without the barrier type screw, had a high defect rate and produced Anxiety remained. The contents of various evaluation items and productivity, the evaluation method and the evaluation criteria are described in [0032] and [003].
3].

[0046]

[Table 9]

[0047]

[Table 10]

[0048]

As described above, according to the vehicle member and the method for manufacturing the same according to the present invention, the various materials for the luminance material are contained by mixing an acid-modified olefin resin and employing a barrier type screw. By sufficiently dispersing the mixture in the mixture system and suppressing the separation from the mixture, defects in the design surface due to agglomerates can be greatly reduced. Can be obtained. Further, since an olefin-based resin can be used as the thermoplastic resin as a main raw material of the vehicle member, an effect of reducing the burden on the environment due to the disposal of the polyvinyl chloride-based resin, which has been frequently used in the related art, is also exerted.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a vehicle member according to a preferred embodiment of the present invention.

FIG. 2 is a process chart showing a manufacturing method for manufacturing a vehicle member according to an embodiment.

FIG. 3 is a state diagram schematically showing a state inside the molding machine when a vehicle member is manufactured using the extrusion molding machine.

[Explanation of symbols]

 Reference Signs List 20 thermoplastic resin 22 pigment 24 brightness material

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 23:26) C08L 23:26) B29K 23:00 B29K 23:00 B29L 31:30 B29L 31:30 ( 72) Inventor Koichi Muraguchi 8-1, Tocho, Fujii-cho, Anjo-shi, Aichi Prefecture Inside the INOAC CORPORATION Sakurai Office (72) Inventor Katsunori Tanaka 7-2-7 Nyorin-cho, Kasugai-shi, Aichi Prefecture (72) Hajime Okutani Fine 148 No. 25, Daifa, Miharacho, Minamikawachi-gun, Osaka Prefecture F-term (reference) DE137 DE236 DG046 DJ046 DJ057 DL007 FD096 GN00

Claims (4)

[Claims] 1. A vehicle member obtained by extruding a mixture containing a thermoplastic resin (20), a pigment (22) and a luminance material (24), wherein the mixture is based on 100 parts by weight of the thermoplastic resin.
0.5 to 10 parts by weight of a luminance material (24) and an acid-modified olefin resin having an acid value in the range of 20 to 70.
A vehicle member using a mixture to which about 5 parts by weight is added. 2. A mixture containing a thermoplastic resin (20), a pigment (22) and a luminance material (24), wherein 100 parts by weight of the thermoplastic resin is mixed with the luminance material (24).
0.5 to 10 parts by weight, and an acid value of 20 to 70
A mixture to which 0.5 to 5 parts by weight of an acid-modified olefin resin in the above range is added, which is extruded using an extruder equipped with a barrier flight type screw, to manufacture a member for a vehicle. Method. 3. A pigment (22) and a luminance material
3. The method for manufacturing a vehicle member according to claim 2, wherein the mixture is individually mixed with the thermoplastic resin (24) and then mixed with the thermoplastic resin (20) and the acid-modified olefin resin. 4. The method for manufacturing a vehicle member according to claim 3, wherein a pulverizing process is performed after the pigment (22) and the dispersant are mixed in advance.