JP6431351B2 - Plastic molded products for vehicle interiors - Google Patents

Description

  The present invention relates to a resin molded product for interior of a vehicle having a texture pattern formed on the surface.

  In the automobile industry, users' needs for resin moldings for interiors of vehicles are diversified, and in particular, decoration has been given mainly to interior resin parts. For example, the surface of a resin molded product used for a vehicle instrument panel, door trim, or the like is formed with a texture pattern (uneven portion) that gives a three-dimensional texture such as a leather pattern, a wood grain pattern, or a satin pattern. Are known.

  Various variations have been proposed so far for the shape of the concavo-convex portion formed in the texture pattern. For example, in the resin molded product shown in Patent Document 1, after forming a texture pattern composed of a plurality of uneven portions on the surface of a polypropylene composite resin material (PP resin), ABS resin, etc., the surface of the uneven portions A fine concavo-convex surface having a finer pattern than the concavo-convex shape is formed.

JP 2007-160637 A

  As in Patent Document 1, by forming a finer uneven pattern on the plurality of uneven portions, a product with a rich three-dimensional effect can be obtained. In addition, when PP resin is used as the interior material, it has superior weather resistance (light) resistance and chemical resistance compared to ABS resin, which is advantageous in terms of durability under the severe long-term use environment of automobiles. There are many. In particular, it is suitable for interior resin parts because of its relatively low gloss and excellent three-dimensional effect, as well as high cracking resistance and excellent crash response performance.

However, PP resin has a defect inferior to scratch resistance performance from the viewpoint of material hardness and surface characteristics as compared with ABS resin. As a means to improve the scratch resistance of this resin part (it is hard to be scratched or hard to notice),
(A) A relatively high hardness film is pasted,
(B) coating a relatively high hardness coating;
(C) Increasing the hardness of the resin material.

  However, the means (a) and (b) increase the cost as the number of extra steps increases. Further, the means (c) has a problem that the originally required performance, that is, the relatively low gloss and excellent three-dimensional effect, and the performance of the high crack resistance and the excellent collision response performance are impaired. There is.

  Therefore, an object of the present invention is to provide a molded article for interior made of PP resin, and to improve the scratch resistance capable of suppressing scratches generated in the use environment.

In the present invention, the first invention is a resin molded product for interior of a vehicle obtained by molding a base material made of polypropylene resin, and the surface of the base material has a texture pattern consisting of a plurality of uneven portions. The surface of the uneven portion of the textured pattern is formed with a fine uneven surface having a fine uneven pattern than the uneven shape of the uneven portion, and a fluororesin is formed on the surface of the fine uneven surface. The touch-up paint is coated, and the depth of the uneven portion of the texture pattern is 30 μm to 100 μm on average, and the height of the fine uneven surface is 1 μm to 5 μm on average, depending on the touch-up paint The thickness of the coating film is 0.05 μm to 10 μm .

  According to a second invention, in the first invention, the touch-up paint containing the fluororesin is an acrylic lacquer paint, and the fluororesin is 2 wt% to 10 wt% with respect to the acrylic lacquer paint. It is included.

A third invention is a fluororesin solution in which the fluororesin is dissolved in a solvent to form a liquid in the second invention , and the fluororesin solution is 5% by weight or more to the acrylic lacquer paint. 30% by weight is contained.

According to the first invention, the gloss is relatively low and the three-dimensional effect and texture are excellent, and the crack resistance is high and the collision handling performance is excellent. In addition to these effects, it is possible to obtain a resin molded product for interior of a vehicle that is excellent in scratch resistance and can maintain good surface blurring .

  According to the second invention, further excellent scratch resistance can be obtained.

  According to the third invention, it is easy to obtain a coating film in which the fluororesin is uniformly dispersed.

FIG. 1 is a perspective view showing a front part of a vehicle compartment provided with a door trim and an instrument panel as an interior resin molded product according to Embodiment 1 of the present invention when viewed from the diagonally left rear side of the vehicle. FIG. 2 is an enlarged cross-sectional view of a texture pattern in the resin molded product according to the first embodiment. FIG. 3 is a view showing a door trim as an interior resin molded product according to Embodiment 2 of the present invention. FIG. 4 is a diagram showing a testing machine used in the scratch resistance test method. FIG. 5 is a diagram showing a scratching needle used in the scratch resistance test method. FIG. 6 is a schematic diagram for explaining an image in the case where each embossed portion of the embossed pattern is scratched with a scratching needle. FIG. 7 is an enlarged cross-sectional view for explaining the movement state of the scratching needle when the touch-up coating including the fluororesin is performed together with the case where the touch-up coating not including the fluororesin is performed. FIG. 8 is a table showing measurement results obtained by measuring the scratch resistance of the textured surface. FIG. 9 is a photomicrograph showing Example 1 and a comparative example.

  Embodiments of the present invention will be described below.

(Embodiment 1)
FIG. 1 shows a front part of a vehicle compartment provided with a door trim 1 and an instrument panel 2 as a resin molded product for interior of a vehicle according to Embodiment 1 of the present invention. The side panel door trim is only shown) and the instrument panel 2 are each made of an integrally molded product using a resin material (for example, polypropylene (PP) or the like). As shown in FIG. 2, the instrument panel 2 and the door trim 1 are formed on the side surfaces of the vehicle interior (surfaces facing the vehicle interior) with a texture pattern 30 that approximates the leather pattern of the actual leather. Yes. The texture pattern is not limited to the leather pattern, and for example, a grain pattern or a satin pattern may be employed.

  As the texture pattern 30, a plurality of concavo-convex portions 31 approximate to a leather pattern are formed on the surface. A fine uneven surface 32 (see FIG. 2) that is finer than the uneven shape of the uneven portion 31 is formed on the uneven portion 31 of the embossed pattern 30 in order to suppress surface glare and excessive gloss.

  As shown in FIG. 2, the concavo-convex portion 31 of the texture pattern 30 includes a base surface portion 33 having a large concavo-convex cross-sectional shape and a plurality of protrusions 34 protruding from the base surface portion 33. The depth of the embossing is a difference in height between the base surface portion 33 and the protruding surface 34, and the average height is about 100 μm, for example. On the surface of the base surface portion 33 and the protruding portion 34, a fine uneven surface 32 having an average depth of, for example, 3 μm is formed.

  In the present invention, the concavo-convex shape composed of the base surface portion 33 and the protrusions 34 having an average height of about 100 μm is referred to as a crease pattern, and the concavo-convex shape depicted in the crease pattern is finer than the concavo-convex shape. The shape is referred to as a fine uneven surface 32. The base surface portion 33 and the projecting portion 34 form a leather-patterned striped pattern, creating a sense of quality and high quality. The fine uneven surface 32 further gives a sense of luxury and high quality. That is, the fine uneven surface 32 is formed on the surface of each uneven portion 31 of the embossed pattern 30 with a kind of fine wrinkle-like image made of a fine uneven pattern. The depth of the fine uneven surface 32 is, for example, an average depth of 3 μm.

  As shown in FIG. 1, the texture pattern 30 is a panel corner portion that bulges from the panel upper surface portion 3 of the instrument panel 2 to the vehicle compartment side at a portion where the panel upper surface portion 3 and the side surface portion 4 of the panel 2 intersect. 5 is formed in the trim corner portion 8 that bulges to the vehicle compartment side at the side surface portion 7 and the upper end portion of the side surface portion 7 of the door trim 1.

  Although the detailed description is omitted, the uneven portion 31 and the fine uneven surface 32 of the embossed pattern 30 are formed when a molded product is formed with a molding die as is known.

<About wrinkle pattern>
As for the depth of the unevenness | corrugation of the texture pattern 30, 30 micrometers-120 micrometers on average are preferable. If the unevenness is too deep, the uneven shape is too conspicuous and cannot be seen as a texture pattern. Conversely, if it is too shallow, the three-dimensional effect is lacking and the sense of quality is poor. Therefore, the above range is preferable.

  The average depth of the fine uneven surface 32 is preferably 1 μm to 5 μm. If the depth of the fine uneven surface 32 is too deep, it will be close to the texture pattern, the difference from the texture pattern will not be noticeable, and it will not be possible to produce a surface shape like a fine wrinkle. The sense of luxury will be poor. Therefore, the above range is preferable.

<Touch-up painting>
The surface of the embossed pattern 30, that is, the surface of the fine uneven surface 32 formed on the base surface portion 33 and the protruding portion 34 is subjected to touch-up painting. In general, the touch-up painting is to perform correction processing when there is a scratch or an unpainted surface on the painted surface after the painting is finished. In the present invention, it is not a correction of the painted surface, but a simple coating that blurs the weld line, color unevenness, etc. on the surface of the molded product of PP resin and makes it inconspicuous. In the present invention, although it is not used as a coating for correcting scratches, it is common in the sense of painting that blurs the painted surface and is referred to as touch-up coating. The touch-up coating is in the range of 0.05 μm to 10 μm. Since the coating is concentrated on the part to be blurred, the thickness varies depending on the part, and the thickness is not uniform. Therefore, there is a portion having a thickness along the fine fine uneven surface 32 and a portion covered with a thickness so as to fill the space between the fine uneven surfaces 32. However, when touch-up paint is applied to the fine uneven surface 32, even if there is a difference in the thickness of the touch-up paint, the touch-up paint is transparent and can be seen through on the surface, so that the wrinkle pattern that appears three-dimensionally The effects / functions of can be maintained without deterioration.

  As a touch-up paint, a commonly used acrylic lacquer paint is used. The touch-up paint is not limited to the paint described above, and it is sufficient that the flow line and unevenness of the interior molded product of the vehicle made of PP resin can be blurred.

<Fluorine content>
The touch-up paint contains 2 to 10 parts by weight, particularly 3 to 7 parts by weight, based on 100 parts by weight of the touch-up paint. The fluorine solution dissolved in the solvent is preferably 7 to 35 parts by weight, particularly 10 to 21 parts by weight. When the fluororesin is a powder, precipitation is likely to occur, and it is preferable that the fluororesin is once dissolved in a solvent. When there is too little fluororesin, the damage resistance by a fluororesin cannot be exhibited effectively. On the other hand, when the amount is too large, the dispersibility is deteriorated and the solution tends to precipitate without dissolving in a solvent, which increases the cost. Therefore, the above range is preferable.

(Embodiment 2)
FIG. 3 shows a second embodiment of the present invention in which the configuration of the door trim 1 is different from that of the first embodiment. In addition, the same code | symbol is attached | subjected about the component substantially the same as FIG. 1, and the detailed description is abbreviate | omitted suitably. In the following description, the front side and the rear side mean the vehicle front side and the vehicle rear side, respectively.

  That is, in the first embodiment, the entire door trim 1 is integrally formed of a resin material, whereas in the present embodiment, the door trim 11 is provided on the vehicle interior side of the door body. The door trim 11 is divided into a plurality of lower first door trim base materials 11a, upper and lower second door trim base materials 11b, and upper third door trim base materials 11c. A speaker (not shown) is accommodated in a speaker accommodating portion provided at the front portion of the first door trim base material 11a, and the vehicle compartment side of the speaker is covered with a cover member 20. A switch (not shown) for opening and closing the window glass is disposed on the shelf portion 21 provided at the front portion of the second door trim base material 11b.

  A door armrest portion 22 is formed between the first door trim base material 11a and the second door trim base material 11b. The door armrest portion 22 is separate from the first door trim base material 11a and the second door trim base material 11b, and has openings (not shown) of the first door trim base material 11a and the second door trim base material 11b. It is formed with a covering armrest lid.

  In the second embodiment, the entire vehicle interior side surface of the first door trim base material 11a, the second door trim base material 11b, and the third door trim base material 11c is formed as a texture pattern 30, and the texture pattern 30 is described in the first embodiment. The same uneven | corrugated | grooved part 31 and the fine uneven | corrugated surface 32 which were performed are formed (refer FIG. 2). And the touch-up coating is given to the fine uneven surface 32 of these door trim base materials 11a, 11b, and 11c.

  Next, a specific example will be described. A molded product of PP resin was obtained by using an injection molding texture plate making mold in which the height of the uneven portion 31 of the texture pattern 30 was 100 μm on average and the depth of the fine uneven surface 32 was 3 μm on average. . At this time, a textured plate having a thickness of 3 mm was prepared by injection molding to prepare a sample of an interior molded product (vertical: 10 cm, horizontal: 10 cm, thickness: 3 mm).

  The touch-up paint includes a paint exclusively for touch-up, but in this example, a trade name “Micron TXL (toluene / xylene-less paint)” manufactured by Cashew Co., Ltd. was used as an existing touch-up paint. A fluororesin-containing solution in which 3.6% by weight of the fluororesin was dissolved in a solvent was prepared. A coating material was prepared by mixing 10% by weight of a fluororesin-containing solution with a paint manufactured by Cashew Co., Ltd. The sprayer to apply is the product name W-101-102P manufactured by Anest Iwata Co., and applied by moving the sprayer laterally at a coating pressure of 0.4 Mpa and a speed of 50 mm / s from a position 30 cm away. .

  At that time, the coating thickness of the touch-up coating is different depending on the parts and the object to be blurred, but it is 0.05 μm to 1.5 μm at the thin part and usually within the range of 7 μm to 10 μm at the thick part.

  As shown in FIG. 8, Examples 1 to 6 were obtained by changing the mixing ratio of the fluororesin and coating these paints. Moreover, what applied the touch-up paint which does not mix a fluororesin similarly to the said Example was made into the comparative example.

<Scratch resistance evaluation>
In this embodiment, scratch resistance, which is highly likely to occur under the usage environment of automobile interior resin parts, was taken up and evaluated for scratch resistance.

  FIG. 4 is a diagram showing a testing machine used in the scratch resistance test method. In this embodiment, as a testing machine, an automatic crosscut testing machine No. 331-AUTO was used. The test machine 50 includes a sample stage 51 on which the sample W is placed, a scratch needle 52 that causes scratches on the sample W, a mounting jig 53 that attaches the scratch needle 52 to the test machine 50, and the scratch needle 52 with a constant load. A weight 54 for pressing against W is provided. FIG. 5 is a view for explaining the shape of the scratching needle 52. The scratching needle 52 is made of sapphire, the tip of a needle having a diameter of 3 mm is formed at an angle of 60 °, and chamfering of R 0.3 mm is performed.

  6 and 7 are diagrams for explaining the surface state of the sample W when tested by the testing machine 50. FIG.

  In the test, each sample W was placed on the testing machine 50, pressed with a pressure of 200 g / cm 2, and pulled 30 mm horizontally and horizontally at a speed of 30 mm / second. For the same sample W, 5 pieces were drawn at intervals of 10 mm in the vertical direction.

  As shown in FIG. 7, the scratching needle 52 is assumed to move laterally following the texture pattern and partially move by crushing the surface.

  Visual evaluation was performed on the presence / absence of occurrence of scratches when the scratching needle 52 was pressed against the test piece by the testing machine 50 and pulled sideways. The result is shown in FIG.

  As for the grade, scratches were not observed at all in grade 5, scratches of 0.5 mm or less were 1 or more in grade 4.5, scratches of length: 0.5 mm or more were average in grade 4 1 line or less per line, 3rd grade, scratches of length: 0.5mm to 1.0mm, 2nd to 3rd average per line, 2nd grade, scratches of 1.0mm or more The evaluation standard was 1 or more on one line on average, and scratches of 1.0 mm or more on the first grade, and 2 or more on one line on average.

  As shown in FIG. 8, when the touch-up paint containing the fluororesin of Examples 1 to 6 is applied, the scratches are short and shallow, and the scratches do not appear to be connected in a single line. So scratches are less noticeable.

  Moreover, the microphotograph of FIG. 9 shows the presence / absence of occurrence of scratches when the scratch needle 52 is pressed and pulled sideways.

  In FIG. 9, the upper left photograph is a 30 × photograph of the comparative example, and scratches appear to shine white in the vertical direction in the center of the photograph. The photograph on the upper right is a 30 × photograph of Example 1, and the scratches appear to shine white in the vertical direction in the middle of the photograph. The lower left photograph is a photograph obtained by enlarging the white-lighted portion of the comparative example by 100 times, and the lower right photograph is a photograph obtained by enlarging the light-white portion of Example 1 by 100 times. In the touch-up paint that does not contain a fluororesin, as can be seen from the upper left and lower left photographs, the protrusion 34 of the uneven portion 31 of the embossed pattern 30 can have a relatively long and deep scratch, so that it becomes a noticeable scratch. These scratches appear to be a continuous line. In the touch-up paint containing fluororesin, as can be seen from the upper right and lower right photographs, the protruding portion 34 of the concavo-convex portion 31 of the embossed pattern 30 only shows a slight partial scratch and scratch. Because the scratches are short and shallow, these scratch scratches do not look like a continuous line. As a result, scratching scratches are inconspicuous. As a result, the scratch resistance was superior to the comparative examples in Examples 1 to 6 in which the touch-up paint contained a fluororesin, and the scratches were not noticeable.

  FIG. 6 shows an image of the state before the scratching needle 52 contacts the fine uneven surface 32 and moves sideways. FIG. 7 is a view for explaining the surface state when the scratching needle 52 moves laterally in contact with the fine uneven surface 32.

  As shown in Example 1, when touch-up coating containing a fluororesin is applied and the scratching needle 52 is moved laterally in contact with the fine uneven surface 32, the fine uneven surface 32 of FIG. A part of it is cut out and it becomes partially scratched. In addition, the state before moving the scratching needle 52 to the side, that is, the state of the fine uneven surface 32 in FIG. 6 is indicated by a dotted line.

  On the other hand, when touch-up coating that does not include a fluororesin is performed as in the comparative example, the fine uneven surface 32 is long and deeply scraped, the scratches are conspicuous, and the scratches are in a single line shape. The result seems to be connected to. This state can be seen as a result of the photograph shown in FIG.

  It should be noted that when the touch-up paint contains a fluororesin, the reason why the scratches are not noticeable compared to the touch-up paint not containing the fluororesin cannot be clearly understood. However, when the fine concavo-convex surface 32 is crushed and the scratching needle 52 moves sideways, the touch-up paint containing the fluororesin remains adhered to the fine concavo-convex surface 32 without peeling off. It can be inferred that the results are not greatly crushed because the scratches are reduced and / or the fluororesin is easily slid sideways.

  INDUSTRIAL APPLICABILITY The present invention is extremely useful because it provides a resin molded product for interior of a vehicle having relatively low gloss and excellent three-dimensional effect, high cracking resistance and excellent crash response performance, and excellent scratch resistance.

DESCRIPTION OF SYMBOLS 1 Door trim 11 Door trim 2 Instrument panel 3 Panel upper surface part 7 Side surface door trim 8 Trim corner part 20 Cover member 21 Shelf part 22 Door armrest part (armrest cover part)
30 Wrinkle pattern 31 Uneven portion 32 Fine uneven surface 33 Base surface portion 34 Projection W Material

Claims (3)

A resin molded product for vehicle interior obtained by molding a base material made of polypropylene resin,
On the surface of the base material, a wrinkle pattern composed of a plurality of uneven portions is formed,
On the surface of the concavo-convex portion of the grain pattern, a fine concavo-convex surface having a finer than the concavo-convex shape of the concavo-convex portion is formed,
The surface of the fine uneven surface is coated with a touch-up paint containing a fluororesin ,
The depth of the uneven portion of the texture pattern is an average of 30 μm to 100 μm,
The average height of the fine irregular surface is 1 μm to 5 μm,
A resin molded product for interior of a vehicle, wherein the thickness of the coating film by the touch-up paint is 0.05 m to 10 m . In claim 1,
The touch-up paint containing the fluororesin is an acrylic lacquer paint,
A resin molded product for interior of a vehicle, wherein the fluororesin is contained in an amount of 2 to 10% by weight with respect to the acrylic lacquer coating. In claim 2 ,
The fluororesin is a fluororesin solution that is dissolved in a solvent and becomes liquid,
A resin molded product for interior of a vehicle, wherein the fluororesin solution is contained in an amount of 5 to 30% by weight with respect to the acrylic lacquer paint.