JP2006341628A - Interior parts for automobiles (sealed rooms) that are unlikely to increase in temperature due to direct light, and methods for suppressing the increase in indoor temperature of automobiles using them - Google Patents

Abstract

The present invention provides an automotive interior product having an infrared shielding function that can be easily integrally formed, and a method for suppressing a temperature rise in an automobile interior using the same.
SOLUTION: Titanium oxide having an average particle size of 0.5 to 20 μm and having infrared shielding ability is 0.7 to 70% by weight, preferably 0.2 to 10% by weight, more preferably 0.3%, based on the resin. Provided is an interior product for automobiles comprising a resin composition kneaded in 3% by weight as a main constituent, and a method for suppressing an increase in indoor temperature of an automobile, comprising the interior product for automobiles.

Description

The present invention relates to an interior interior for a sealed room, an automobile part, an interior for an automobile, and a method for suppressing an increase in the indoor temperature of an automobile using the interior.

Conventionally, attempts have been made to increase the economic efficiency by reducing the weight of a car body. The weight reduction of the car body is mainly aimed at economy, performance, and safety at the time of driving, but at the same time the economy at the time of manufacture is satisfied, and it is a technique that does not impair the conventional safety and comfort. Is required.

For example, in order to reduce the size and weight of a cooling device, develop a cooling device that maintains the same performance even if it is reduced in size or weight, or reduce the load by reducing the amount of heat entering the vehicle body from the outside. It is necessary to ensure the same comfort even when using a cooling device having a low temperature.

However, when using a method that reduces the amount of heat entering the vehicle from the outside, using a normal heat insulating material on the vehicle will not provide a sufficient light weight effect. It is preferable that the method can reduce the amount of heat that enters.

Also, under the hot summer weather, the temperature of the interior of a car rises to over 70 ° C. In particular, dashboards and other instrument panels (instrument panels), (power) steering, and doors that are exposed to direct sunlight through glass windows. Interior parts such as burrs are required to have high heat resistance, and the materials that can be used are limited. If these automobile interior parts and parts have a function of shielding solar heat, it is possible to manufacture a car that suppresses temperature rise even when exposed to direct sunlight.

On the other hand, conventional automobile bodies are required to have excellent rust prevention and weather resistance, as well as excellent gloss, smoothness, color, etc., from the standpoint of preventing rust, etc. or imparting aesthetics. In addition, interior-related automotive parts such as seats, ceiling linings, key lock housings, instrument panels, steering and door trims are designed and manufactured exclusively from the viewpoint of imparting aesthetics.

Thus, in particular, conventional automobile parts are manufactured exclusively from the viewpoint of aesthetics and durability, and little consideration has been given from the viewpoint of solar heat shielding.

Therefore, high-lightness automotive interior parts and parts are inherently highly visible and have a certain degree of shielding even without consideration from the viewpoint of solar thermal shielding. Low-lightness car body parts absorb sunlight significantly. For example, the temperature of an instrument panel (instrument panel) and a steering wheel of a car left under a hot summer heat exceeds 90 ° C, and it cannot be touched with bare hands. To do. Also, if the car in a sealed state is parked under the hot summer heat, the interior of the vehicle exceeds 70 ° C., which is extremely uncomfortable when riding.

Further, in order to solve such a problem, in JP-A-11-302549 and JP-A-2002-60698, the content of carbon black having a large infrared absorption action contained in the resin is not more than a certain value. Technology that forms an infrared shielding layer consisting of an infrared reflecting composition or infrared reflector having a wide range of color development and a high degree of design freedom on the surface of automotive interior parts and parts Has been proposed.

However, in order to form an infrared shielding layer on the surface of an automobile interior part made of resin or the like, the interior part manufacturing process is complicated.

In addition, the pigment used for infrared shielding must use fine particles adjusted to an average particle diameter of about 0.2 μm, which has a high refractive index and is most likely to scatter visible light. Therefore, it becomes expensive, and its handling is not always easy, such as poor kneadability with resin.
WO2004-52786 JP-A-11-302549 JP2002-60698

The object of the present invention is mainly composed of a resin composition, and by giving an infrared shielding function to an integrally molded automobile part itself, the manufacturing process of the automobile part is simplified and the work is facilitated. The purpose is to suppress the surface temperature of these parts and the temperature rise in the passenger compartment due to direct light under the hot sun of the car used.

As a result, discomfort during boarding is reduced, the tolerance limit of heat resistance required for the material is relaxed during manufacturing of automobile parts, and the material range of usable materials is expanded. And the expansion of such usable materials can result in an increase in economy. In addition, since the in-vehicle cooling device can be reduced in size and weight, it is possible to increase the economic efficiency during manufacturing and traveling.

Furthermore, another object of the present invention is not only for the automobile parts described above, but also for interior items in a closed system room, by using the interior product according to the present invention, a room where temperature rise due to sunlight or direct light does not easily occur. It is to be realized.

As a result of intensive research to prevent the temperature from rising due to sunlight, the present inventor has kneaded titanium oxide having a relatively large particle diameter having a characteristic of shielding infrared rays into a resin product used as an automobile part. The present inventors have found that an excellent solar heat shielding effect can be exhibited, and temperature rises in automobile parts and automobile sealed rooms can be suppressed.

That is, in the first configuration of the present invention, the titanium oxide having an infrared shielding ability with an average particle diameter of 0.5 to 20 μm is 0.7 to 70% by weight, preferably 0.2 to 10% by weight, based on the resin. More preferably, it is an automobile interior product having a resin composition kneaded in an amount of 0.3 to 3% by weight as a main component.

Car interior parts are broadly classified into instrument panels, seats, door trims, power steering, ceiling linings, key lock housings, etc., but the present invention parts are those where resin is used in those interior parts. If so, it is applicable.

Further, in the present invention, the infrared shielding ability of titanium oxide used means that the integrated reflectance in the infrared wavelength region of 1500 to 2600 nm is 90% or more.

The second configuration of the present invention is a method for reducing the temperature rise of an automobile body by equipping the automotive interior containing titanium oxide having infrared shielding ability.

And the 3rd structure of this invention is the main component of the resin composition which knead | mixed 0.1 to 70weight% of the titanium oxide which has infrared shielding ability with an average particle diameter of 0.5-20 micrometers with respect to resin. It is interior product for sealed indoors.

The present invention will be described in detail below. The automobile interior parts or automobile parts in the present invention refer to interior parts and parts installed in a space occupied by a driver and a passenger when driving a car, that is, in a vehicle interior.

In other words, articles that can be installed as automobile parts classified as steering wheel, dashboard, instrument panel, console, door trim (inner burr), seat, (power) steering, ceiling lining, key lock housing, etc. Examples of such automobile interior parts and parts include the following.

Instrument panel (instrument panel), door trim (trim), pillar garnish (pillar), handle (assist handle), lever and knob grip, console box, dashboard, speaker cover, window molding, armrest, pedal cover, package tray , Rear tray, glove box, glove box ash tray (ashtray), cup holder, center cluster, center console panel etc. resin molding part, curtain parts, sunshade, sunroof shade, ceiling material, headrest, roof lining, floor material, Seat members such as seats.

The main resin composition constituting the automobile interior parts or automotive parts used in the present invention is generally applied to automobile interior parts, such as polyvinyl chloride resins, polyethylene resins, polyester resins, etc. Although a resin composition can be used, in consideration of kneadability with an infrared shielding material, a resin composition that can knead at least a powder such as titanium oxide having an average particle diameter of 0.5 to 20 μm, Must be a blend.

Specific examples of the resin used as the resin composition include polyethylene resin, ethylene vinyl acetate copolymer resin, polypropylene resin, polystyrene resin, AS resin, ABS resin, methacrylic resin, polyvinyl chloride resin, polyamide resin, and polycarbonate. Resin, polyethylene terephthalate resin, polybutylene terephthalate resin, diallyl phthalate resin, urea resin, melamine resin, xylene resin, phenol resin, unsaturated polyethylene resin, epoxy resin, furan resin, polybutanediene resin, polyurethane resin, melamine phenol resin, Chlorinated polyethylene resin, vinylidene chloride resin, acrylic vinyl chloride copolymer resin, AAS resin, ACS resin, polyacetal resin, polymethylpentene resin, polyphenylene oxide resin, Synthetic PPO resin, polyphenylene sulfide resin, butadiene styrene resin, polyamino bismaleimide resin, polysulfone resin, polybutylene resin, silicon resin, polytetrafluoroethylene resin, polyfluoroethylene propylene resin, perfluoroalkoxy fluoroplastic, polyfluoride Examples thereof include vinylidene resin, MBS resin, methacryl-styrene resin, polyimide resin, polyarylate resin, polyallyl sulfone resin, polyether sulfone resin, polyether ether ketone resin, and the like, which can be suitably used for automobile interior parts. .

Examples of the resin used as the main component of resin molding include acrylonitrile butadiene styrene resin, acrylonitrile styrene acrylic resin, vinyl chloride resin, vinylidene chloride resin, polyethylene resin, polypropylene resin, methacrylic acid resin, Examples thereof include methacrylic acid ester resins, polyester resins, polystyrene resins, polycarbonate resins, and the like. When these thermoplastic resins are used, a molded product can be easily prepared.

In addition, when performing extrusion molding, the vinyl chloride resin is preferable because it is excellent in productivity such as extrusion speed, strength, and workability. Preferable is, for example, acrylonitrile butadiene styrene resin, but these molding resins may be used alone or in combination of two or more.

The titanium oxide having an infrared shielding ability, which is kneaded into the interior resin composition, has an average particle size of 0.5 to 20 μm or less, preferably 0.8 to 10 μm. In addition, about the measuring method of the average particle diameter of a titanium oxide, after photographing the primary particle diameter of a titanium oxide on the photograph using the transmission electron microscope JEM-1230 by JEOL Co., Ltd., the image is an image analysis formula by MOUNTECH. Particle size distribution measurement software MAC-View Ver. Statistical processing was performed at 3, and calculation was performed. In calculating the average particle diameter, a volume-based equivalent circle diameter was employed. In addition, the infrared shielding ability here means a function in which the integrated reflectance is 90% or more in an infrared wavelength region of 1500 to 2600 nm.

Titanium oxide generally used as a pigment refers to titanium oxide having an excellent shielding property against visible light having an average particle diameter of about 0.2 μm. Since such titanium oxide has a high refractive index, It is known as a white pigment that exhibits excellent hiding power (ability to hide the groundwork) when blended in paints and plastics. And in order to exhibit the function as the white pigment, since it is controlled to the particle diameter which can scatter visible light most easily, it is fundamentally different from the titanium oxide used by this invention.

Titanium oxide used in the present invention has an average particle size of 0.5 μm or more, which is larger than that of general pigment titanium oxide. Therefore, it accounts for about 50% in sunlight and is said to be most easily converted into heat energy. Infrared components can be efficiently scattered without being absorbed by the object surface.

For this reason, the scattering efficiency in visible light, in which a general pigment titanium oxide is required as a white pigment, conversely decreases, and the whiteness in appearance is reduced.

This means that, for example, when used in a system that uses colored pigments in combination, particularly in a deep color system, the amount used is limited even in fields where the amount used is limited due to problems such as white blurring in terms of white pigments. The range expands.

In addition, since the number of particles per unit weight is reduced by a factor of about 10 times compared to conventional titanium oxide due to the increase in particle size, the affinity rate with the resin is improved and each particle is dispersed separately during resin kneading. There is also an advantage that energy can be reduced.

In addition, you may surface-treat to the particle | grain surface for the purpose of the dispersibility improvement with respect to the resin composition in the said titanium oxide.

Examples of the inorganic substance to be coated when performing the surface treatment include aluminum, silicic acid, zirconium, zinc, titanium, tin, antimony, cerium oxide or hydrated oxide. As the compound used for the surface treatment, for example, alumina. Acid soda, aluminum sulfate, aluminum chloride, sodium silicate, hydrous silicic acid, zirconium sulfate, zirconium chloride, zinc sulfate, zinc chloride, titanyl sulfate, titanium chloride, tin sulfate, tin chloride, antimony chloride, cerium chloride, cerium sulfate, etc. Can be used. Similarly, organic substances to be coated during the surface treatment include, for example, organosilicon compounds such as aminosilane, alkylsilane, polyether silicone, and silicone oil, stearic acid, magnesium stearate, zinc stearate, sodium stearate, and laurin. Examples include acid, alginic acid, sodium alginate, triethanolamine, and trimethylolpropane.

In the surface treatment for titanium oxide, there is no limitation on the combination and amount of substance types to be treated, and it may be applied as appropriate depending on the use situation and required characteristics.

As a compounding quantity of the titanium oxide which has the infrared shielding ability kneaded in a resin composition, 0.1 to 70 weight% is preferable. When the blending amount is less than 0.1% by weight, the interior resin composition cannot sufficiently exhibit the infrared shielding ability. On the other hand, if the blending amount exceeds 70% by weight, the kneadability to the resin is deteriorated and the physical properties as a synthetic resin are impaired.

If the resin composition used in the present invention contains the above-described titanium oxide having an infrared shielding ability and a thermoplastic resin, as other components, a filler, a modifier, a thermal stabilizer, a plasticizer, An antioxidant, a light stabilizer, a lubricant, an antistatic agent, a flame retardant, and the like may be contained within a range that does not impair the characteristics of the present invention.

Further, an oxide having the same infrared shielding ability may be blended, and for the purpose of imparting a heat insulation function, a spherical hollow particle using a resin such as glass balloon, shirasu balloon, or polystyrene is blended. Is also possible.

In addition to the above-mentioned titanium oxide having infrared shielding ability, the interior resin composition contains a colorant generally used within a range not impairing the characteristics of the present invention, if necessary, as a colored resin composition. Also good.

Specific examples of substances that can be used as colorants include white pigments such as titanium dioxide pigment, zinc oxide, talc, and calcium carbonate, cyan pigments and dyes such as cobalt blue, ultramarine blue, ceria blue, and phthalocyanine blue, cobalt violet, Examples thereof include magenta pigments and dyes such as fast violet and manganese violet, quinacridone reddish pigments, black pigments such as carbon black and iron black.

In addition, the pigments used as the colorant may themselves have an infrared shielding ability, and these can be used in appropriate combination.

The resin composition used in the present invention is produced by mixing a titanium dioxide pigment and a thermoplastic resin, then melt-kneading using a kneader and molding.

When titanium oxide having infrared shielding ability is blended in the resin composition, a general kneading method can be applied. There is no limitation on the kneading order, etc., even if all are mixed directly at once, filler, modifier, heat stabilizer, plasticizer, antioxidant, light stabilizer, lubricant, antistatic agent, You may shape | mold, disperse | distributing a flame retardant etc.

As a mixing method, it is preferable to mix using a general mixer such as a Henschel mixer or a super mixer. As the kneader, for example, a two-roll, three-roll, pressure kneader, Banbury mixer, single screw or two Examples of the multi-screw type kneading extruder and the rotor type kneader include the above, but the invention is not particularly limited thereto.

The molded product of the resin composition containing the titanium oxide having infrared shielding ability is a method of molding a resin composition adjusted to a predetermined titanium oxide concentration, or a master in which titanium oxide is dispersed in a high concentration in the resin composition. After producing a batch, it can be produced using a method such as diluting to a predetermined concentration with these thermoplastic resins and molding. Alternatively, the above-described blending components such as thermoplastic resin may be melt-kneaded to obtain a resin composition, which may be molded with an extruder or the like.

According to the present invention, by incorporating titanium oxide having a relatively large particle size having a characteristic of shielding infrared rays into a resin product used as an automobile part, it is excellent in cost and does not require a special manufacturing process. It is possible to provide an automobile part that exhibits a solar heat shielding effect.

As a result, when the automotive interior product according to the present invention is used, for example, even if the direct sunlight continues to hit through a glass window under a hot sun, it becomes possible to suppress the surface temperature of the vehicle interior parts and the temperature rise in the vehicle interior. Therefore, to reduce discomfort when riding, and to reduce the allowable limit of heat resistance required for materials when manufacturing automotive parts, to expand the range of usable materials and improve economy Can do.

Further, the resin composition used in the automotive interior parts and automotive parts of the present invention can reduce the rate of increase with respect to the surface temperature of the article against direct sunlight and the temperature of the room in which it is installed. The same effect can be exhibited even if indoor interior parts corresponding to the interior parts for automobiles of the present invention are installed in a room such as a vehicle or a living room having a relatively high sealing property.

Hereinafter, the present invention will be described with reference to examples. In addition, this invention is not limited to the Example shown below, A various change is possible within the range which does not deviate from the technical idea of this invention.

Infrared shielding ability measurement method of titanium oxide :
A pressure-molded body of titanium oxide powder is prepared, and the reflectance is measured by irradiating the sample at an incident angle of 10 ° using a spectrophotometer with an integrating sphere having a measurement range of 240 to 2600 nm. As the measuring device, for example, U-4100 manufactured by Hitachi is used, and the integrated reflectance at a wavelength of 1500 to 2600 nm is calculated.

The visible light reflectance of titanium oxide having an average particle diameter of 1.0 μm used in this example was about 93%, and the reflectance at 1500 to 2600 nm was about 94%. Further, the visible light reflectance of titanium oxide having an average particle diameter of 0.2 μm used in the comparative example was about 98%, and the reflectance at 1500 to 2600 nm was about 86%.

Preparation of resin composition having infrared shielding ability :
In order to clearly show the heat shielding effect, the resin composition which is the main constituent element of the present invention was made into the form of a test plate, and a heat shielding test was performed when it was installed in a sealed space.

Table 1
Example 1 Comparative Example 1 Example 2 Comparative Example 2
Titanium oxide 1 1 0.5 0.5
LDPE resin 100 100 100 100
Total 101 101 100.5 100.5

Resin compositions of Examples and Comparative Examples were prepared at the ratios shown in Table 1.
LDPE resin: Sumikasen F101-1 (LDPE resin manufactured by Sumitomo Chemical Co., Ltd.)
-Titanium oxide of Examples 1 and 2: JR-1000 (average particle diameter 1.0 μm) manufactured by Teika
-Titanium oxide of Comparative Examples 1 and 2: JR-405 (average particle size 0.2 μm) manufactured by Teika

Kneading conditions :
The LDPE resin was melted for 2 minutes using a φ6 × 15 test roll machine (Irie Iron Works Co., Ltd., heated two-roll kneader), and then titanium oxide was added and kneaded for 5 minutes. A test plate was produced from these using a single-acting compression molding machine F-37 type (pressure press machine manufactured by Shinto Metal Industry Co., Ltd.).
Test plate size: 150 × 200 × 1 (mm) (Example 1, Comparative Example 1)
65 × 85 × 0.1 (mm) (Example 2, Comparative Example 2)

Thermal insulation test method :
About the said test board, as shown below, it installed in the box-shaped foamed resin heat insulation box upper part, and the thermal-insulation characteristic was measured by irradiating with an incandescent lamp.

Test container: heat insulation box made of foam resin (box internal volume 8160 cm ³ )
・ Irradiation lamp: 125W incandescent bulb
IR100V125WRHE for infrared drying (manufactured by Toshiba Lighting & Technology Corp.)
-Test plate installation position: 15cm directly under the light source
-Thermocouple measurement position for temperature measurement:
Back surface temperature: Back surface of the 15cm test plate directly under the light source Space temperature: Central space in the heat insulation box made of foam resin
(Locations that are not exposed to 30cm incandescent light from the light source)
・ Irradiation lamp irradiation time: 20 minutes

Measuring method :
-Prepare test plates for each example and comparative example.
・ Create an open space of the same size as the test plate on the insulation box made of foam resin, place the test plate horizontally, and fix the temperature sensor by thermocouple in the center of the back of each test plate and the center space in the insulation box made of foam resin. .
・ Turn on and illuminate the incandescent lamp under the above conditions.
・ Measure the temperature of the thermocouple (back surface temperature and space temperature) every 5 minutes from immediately after irradiation until 20 minutes later.
The said measurement was each implemented about the test board obtained by each Example and the comparative example.

The above measurement results are shown in Table 2 (back surface temperature) and Table 3 (space temperature). In any numerical value, the unit of temperature is ° C.

Table 2 (Backside temperature)
Example 1 Comparative Example 1 Example 2 Comparative Example 2
Immediately after irradiation 26.0 25.9 22.6 22.8
After 5 minutes 71.8 76.0 45.2 46.3
After 10 minutes 81.5 84.8 52.0 53.3
After 15 minutes 84.2 87.5 55.1 57.0
After 20 minutes 85.4 88.4 55.1 57.0

Table 3 (space temperature)
Example 1 Comparative Example 1 Example 2 Comparative Example 2
Immediately after irradiation 25.8 25.9 22.5 22.6
After 5 minutes 38.9 42.0 45.2 47.5
After 10 minutes 45.7 49.6 47.4 50.2
After 15 minutes 48.5 52.8 47.7 50.6
After 20 minutes 49.7 54.1 48.0 51.0

As is clear from the above results, the resin composition that is the main component of the present invention has an effect of suppressing the temperature increase against the increase in the article temperature and the sealed space temperature due to direct light compared with the general product. It turns out that there is.

As a result, the automobile part according to the present invention having the resin composition as a main constituent element can be integrally molded without the necessity of forming an infrared shielding layer by providing the automobile part itself with an infrared shielding function. In addition, the work can be facilitated, and it is possible to suppress the surface temperature of these parts and the temperature rise in the passenger compartment due to the direct light under the hot sun of the automobile using this.

Claims (6)

An interior interior product for a sealed room whose main constituent is a resin composition obtained by kneading 0.1 to 70% by weight of titanium oxide having an average particle size of 0.5 to 20 μm and having infrared shielding ability. The interior product according to claim 1, wherein the sealed interior product is an automotive interior product. The interior product according to claim 2, wherein the interior product for an automobile is an instrument panel, a steering, a seat, a ceiling lining, a door trim, or a key lock housing. The interior product according to any one of claims 1 to 3, wherein the titanium oxide has an integrated reflectance of 90% or more in an infrared wavelength region of 1500 to 2600 nm. An automobile equipped with the automobile interior product according to claim 2. A method for suppressing an increase in the indoor temperature of an automobile, comprising the interior article for an automobile according to claim 2 or 3.