JP2016037258A - Material for instrument panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an instrument panel equipped with, especially, a high temperature degradation countermeasure.SOLUTION: A material for an instrument panel of a vehicle is provided. The material is prepared with added inorganic system baking pigment that reflects infrared ray. A target temperature range where the material degrades is higher than a temperature range at which no discomfort is felt even if a person touches it.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a material for an instrument panel, and more particularly to a material for an instrument panel in which measures against high temperature deterioration are taken.

  Conventionally, an instrument panel (instrument panel) is made of a resin material, exposed to sunlight through a windshield of a vehicle, and becomes hot due to infrared rays of sunlight.

  On the other hand, the deterioration of the resin material proceeds faster as the temperature is higher (the deterioration of the resin material is a chemical reaction, and the chemical reaction proceeds faster as the temperature is higher). For this reason, lowering the surface temperature of the product leads to a longer product life.

  For example, Patent Document 1 can be cited as a document related to the prior art.

JP 2001-114149 A

  The instrument panel has a low gloss to suppress light reflection to the windshield, and black or low-lightness colors are used, and the infrared absorption rate is high, so the temperature rises easily. The black or low-lightness color is toned using a carbon black pigment, and carbon black having a high infrared absorption rate tends to cause a temperature rise.

  When the temperature rises, the deterioration reaction is promoted, the material characteristics are lowered, the product life is shortened, and the failure is caused.

  In addition, in order to lower the temperature of the product surface to the temperature that the product specification user does not feel uncomfortable with the aim of the conventional technology, a large amount of pigment that does not absorb (reflect) infrared rays is added. It is necessary and the degree of freedom of color selection is low. In addition, there is a problem of affecting the physical properties, toning, and cost of the material.

  According to the first aspect of the present invention, in the material of the instrument panel of the vehicle, the material is obtained by adding an inorganic calcined pigment that reflects infrared rays to a resin material. The target temperature is a temperature range higher than the temperature range in which the touch does not cause discomfort.

  The invention according to claim 2 is characterized in that the high temperature region is 100 ° C. or higher.

  The invention according to claim 3 is characterized in that the addition amount of the infrared reflective pigment is reduced and the degree of freedom of the addition amount of the pigment for color adjustment is increased.

  According to the present invention, the infrared reflection of the color pigment reflects the infrared rays of sunlight, the temperature rise of the product (material) is suppressed, and the speed of the deterioration reaction of the resin material for instrument panels is suppressed.

  The product life can be extended by lowering the surface temperature in a high temperature range of 100 ° C. or higher or in a high temperature range where a human hand touches and causes burns. In particular, in a chemical reaction between a PVC (polyvinyl chloride) material and a urethane foam material, deterioration of the product can be suppressed by a surface temperature suppressing effect.

  The aim is to suppress the surface temperature of the instrument panel at high temperatures (to suppress the deterioration of materials in high-temperature environments where people touch and cause burns), so the amount of pigments that reflect infrared rays can be reduced, and colors Can be obtained.

It is the schematic which shows the outline of an instrument panel. It is a figure which shows the relationship between a wavelength and a reflectance. It is a figure which shows the relationship between a wavelength and a reflectance. It is a figure which shows the relationship between time and temperature. It is explanatory drawing explaining the degree of degradation by an elongation value. It is a figure which shows the relationship between time and temperature about a burn. It is a figure which shows the relationship between time and temperature.

  Embodiments of the present invention will be described with reference to the drawings.

  Please refer to FIG. A vehicle (for example, an automobile) 1 includes a windshield 2, a handle 3, a front 4, an instrument panel 5, and the like. The instrument panel 5 is exposed to sunlight or the like inserted from the windshield 2 and becomes high temperature.

  In this example, the carbon black pigment used for coloring the resin material used for the instrument panel 5 is changed to an inorganic calcined pigment (infrared reflective pigment) that reflects infrared rays.

  A method for manufacturing the instrument panel 5 according to this example will be described. An infrared reflective pigment is kneaded into an injection molding resin or a vacuum molding skin material. Disperse in paint. It is colored by a method such as attaching to a resin powder for powder slush. Moreover, in the case of the resin material for injection molding, it colors also by a masterbatch system.

  The infrared rays of sunlight are reflected by the inorganic calcined pigment. And the temperature rise of a product (material) is suppressed by reflecting infrared rays. In general, the deterioration reaction (chemical reaction) rate and temperature are in a proportional relationship.

  In the material of the instrumental panel 5 according to the present invention manufactured as described above, it is possible to suppress deterioration at 100 ° C. or higher in the product evaluation test. That is, the product life is extended. Moreover, since it aims at suppression of surface temperature, the addition amount of the pigment which reflects infrared rays can be decreased, and the freedom degree of color is obtained.

  The effects and the like obtained from the examples will be described below based on the examples.

Please refer to FIG. The horizontal axis is wavelength (nm), and the vertical axis is reflectance (%). Compared to carbon black, IRR black (# 6301, # 6303, # 6350: all commercially available), which is an inorganic calcined pigment (infrared reflective pigment) of this example, has excellent reflection characteristics despite being black. (Because it is black, reflection of light on the windshield can also be suppressed). TiO ₂ is white and has a high reflectance.

  Please refer to FIG. It is a figure of the result of having measured the spectral reflectance by toning the skin material made from PVC (polyvinyl chloride) used for the instrument panel 5 with an infrared reflective pigment. In FIG. 3, the horizontal axis represents wavelength (nm) and the vertical axis represents reflectance (%). As a result, it can be seen that the reflectance (%) is higher for both the infrared reflective pigment alone and the infrared reflective pigment toning compared to the carbon black tone.

  Please refer to FIG. A PVC (polyvinyl chloride) skin used for the instrument panel 5 which was toned black with a carbon black pigment was left in a constant temperature bath at 80 ° C., and the surface temperature was adjusted to 120 ° C. by irradiation with an infrared lamp. Under the equivalent condition, it can be seen that the surface temperature of the PVC (polyvinyl chloride) skin used for the instrument panel 5 toned in black with the infrared reflecting pigment has decreased by 5 ° C. In FIG. 4, the horizontal axis represents time (hour) and the vertical axis represents temperature (° C.).

  Please refer to FIG. A tensile test in the carbon black toning (TP1A) and a tensile test in the infrared reflective pigment toning (black # 6301) were performed in an environment of −20 ° C.

  As a result, after leaving it to stand for 250 hours under the above conditions to cause thermal deterioration, the mechanical properties (tensile strength) of the PVC (polyvinyl chloride) skin material for the instrument panel 5 are examined to suppress deterioration of physical properties. The effect was confirmed. That is, it was confirmed that the mechanical properties (tensile strength) of the infrared reflective pigment toning (black # 6301) were improved as compared with the carbon black toning (TP1A).

  The effects obtained from the above experimental results will be described.

  [1] Deterioration of the resin material can be suppressed by adding an infrared reflective pigment to the resin material used in the instrument panel.

  [2] Resin materials are injection molding resin (PP (polypropylene) resin), vacuum molding skin material (olefin-based), injection skin material (olefin-based), powder slush skin material (TPU (thermoplastic elastomer)) , PVC (polyvinyl chloride).

  [3] The deterioration of the resin material covers light deterioration (mainly ultraviolet light), oxidation deterioration, and heat deterioration.

  [4] The same effect can be obtained even when a product made of the material of [2] is coated with a coating agent to which an infrared reflecting pigment is added.

  Please refer to FIG. In this example, the temperature at which a person does not feel uncomfortable refers to an area other than the area where the person touches and burns in FIG. That is, the relationship of the temperature at which a person burns> the temperature at which a person feels uncomfortable holds. In addition, FIG. 6 is quoted from “JSHI Journal: 120 (2), 173-192, 2010 (Hei 22) Dermatological Seminarium Burns”.

  Please refer to FIG. The figure showing the temperature of vehicles is shown. According to this, it can be seen that the dashboard, the seat belt tongue plate, the lower part of the windshield, the water temperature of the plastic bottle left in the vehicle, the interior temperature, and the outside temperature change with time. Above all, the higher the dashboard temperature, the higher the outside temperature. FIG. 7 is quoted from “JAF Homepage http://www.jaf.or.jp/data/07usertest/index.html”.

  The present invention is not limited to the embodiments of the invention described above, and can be implemented in other modes by making appropriate modifications.

1 Vehicle 2 Windshield 3 Handle 4 Front 5 Instrument Panel

Claims (3)

In the material of vehicle instrument panels,
The material is obtained by adding an inorganic calcined pigment that reflects infrared rays to a resin material, and a target temperature range in which deterioration of the material is avoided is set to a higher temperature range than a temperature range in which a person does not feel uncomfortable. Materials for vehicle instrument panels.   The said high temperature range is 100 degreeC or more, The material of the instrument panel of the vehicle of Claim 1 characterized by the above-mentioned. The material for an instrument panel of a vehicle according to claim 1 or 2, wherein the amount of the infrared reflective pigment added is reduced to increase the degree of freedom of the pigment added for color adjustment.

Images