JP2008121175A - Heat-preventive safety helmet for blocking heat ray - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-preventive safety helmet for preventing increase of inside temperature of the safety helmet by blocking heat ray from the outside. <P>SOLUTION: In the safety helmet, an inorganic spherical particles-containing heat ray-blocking coating 2 is applied e.g. in a coated film thickness of 100 μm to the outside surface of a helmet 1. The inorganic spherical particles-containing heat ray-blocking coating 2 is a polymer composite material to which inorganic spherical particles are added and the coating 2 reflects about ≥85% of radiation energy of direct rays which outside surface of the helmet 1 receives and suppresses release of radiation energy to the inside of the helmet 1 to ≤15%. As a result, in the safety helmet 1, increase of inside temperature of the helmet 1 is prevented and a heat-insulating layer is not formed and when the outside surface temperature of the helmet 1 is reduced to a temperature not higher than the inside temperature by external factor, heat energy is released to the outside without accumulating the heat energy and the inside temperature can be lowered. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a safety heat-resistant cap that prevents the temperature in a safety cap such as a helmet from rising due to heat rays contained in direct sunlight.

  In general, workers must wear helmets to protect their heads even in places exposed to large amounts of direct sunlight such as outdoor construction sites. In places where it is mandatory to wear a helmet due to laws and regulations, a helmet or other safety cap must be worn to protect the head without being affected by climatic conditions.

  Therefore, the outer surface temperature of the helmet rises with the increase in solar radiation in the summer, and the inner temperature rises in response to this, so the person wearing the helmet feels uncomfortable and leads to reduced workability and negligence Problems arise. In terms of health, it is one of the causes of heat stroke.

In view of this, in order to mitigate the temperature rise inside the helmet, a heat insulating paint is applied to the outer and inner surfaces of the helmet (for example, Patent Document 1 and Patent Document 2). A helmet provided with ventilation holes and the like to improve ventilation (for example, Patent Document 3). Or forcibly cooled with a cold insulating mat or the like (for example, Patent Document 4). Etc. are known.
JP 2002-31536 A JP 2000-27020 A JP2002-69738 JP 2000-96333 A

  Of the conventional proposals described above, the thermal insulation coating is applied to the outer surface of the helmet, which causes external factors such as wind blowing and reduced solar radiation. Even if the temperature on the outside of the helmet is lowered, the heat inside the helmet is difficult to conduct to the outside, so that the temperature inside the helmet is hardly lowered. Moreover, since the head itself is a heating element, there is a concern about the necessity of the work of taking off the helmet again due to the influence of the heat insulating layer, leading to a temperature rise inside the helmet. In addition, those provided with a vent and those forcedly cooled by a cold mat or the like have problems such as an increase in the weight of the helmet and a decrease in strength due to a complicated structure.

  The present invention solves such a conventional problem and prevents the temperature inside the helmet from rising due to the influence of heat rays contained in direct sunlight without forming a heat insulating layer, and maintains the weight and strength of the helmet itself. It aims to provide a safety hat that can be used.

  In order to solve the above-mentioned problem, the present invention applies a heat ray shielding material containing inorganic spherical particles as a paint to at least the outer surface of the helmet body and has a solar reflectance of 85% or more in a wavelength range of 300 nm to 2500 nm, and no heat insulating layer is formed. It is characterized by that. Further, the heat-shielding material containing inorganic spherical particles is formed as a heat-shielding layer on the outer surface of the helmet, has a solar reflectance of 85% or more in a wavelength range of 300 nm to 2500 nm, and is not characterized in that a heat insulating layer is not formed. Furthermore, it is also characterized in that a polymer structure film as an inorganic spherical particle-containing heat ray shielding material is attached to the outer surface of the helmet, has a solar reflectance of 85% or more in a wavelength range of 300 nm to 2500 nm, and no heat insulating layer is formed.

  Furthermore, when applying the inorganic spherical particle-containing heat ray shielding material as a paint, the coating material that improves the adhesion of the inorganic spherical particle-containing heat ray shielding coating material and the inorganic spherical particle-containing heat ray shielding coating material reduces the strength of the helmet without violating the base material of the helmet. It is also characterized by not waking up.

  As described above, in the present invention, the heat ray applied to the outer surface of the helmet is reflected and shielded to suppress the increase of the temperature of the outer surface of the helmet, thereby reducing the heat energy transmitted to the inner side of the helmet, and to suppress the temperature increase of the inner side of the helmet. Since it is not formed, internal heat can be quickly released when the outside temperature of the helmet becomes lower than the inside temperature due to external factors. Furthermore, since it does not have a complicated structure, it does not cause an extreme increase in weight or strength.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  FIG. 1 is a schematic diagram of a cross-sectional view in which an inorganic spherical particle-containing heat ray shielding paint is applied to the outer surface of a helmet. In FIG. 1, 1 is a helmet. 2 is an inorganic spherical particle containing heat ray shielding coating layer. Reference numeral 3 denotes a paint layer that improves the adhesion between the helmet and the inorganic spherical particle-containing heat ray shielding paint. In addition, the helmet interior is abbreviate | omitted in this figure.

  The inorganic spherical particle-containing heat ray-shielding coating material forming the inorganic spherical particle-containing heat ray-shielding coating layer 2 is, for example, a mixture of titanium oxide and inorganic spherical particles based on an acrylic copolymer emulsion, and an antifoaming agent as an additive for coating performance. Dispersants, preservatives and the like are also added as ingredients.

  The inorganic spherical particle-containing heat ray-shielding paint for forming the coating layer 3 that improves the adhesion between the helmet and the inorganic spherical particle-containing heat ray-shielding paint is of a nature that does not violate the base material of the helmet and does not cause a reduction in the strength of the helmet.

  As Example 1, a paint (product name: Ad Green Coat Water-based Primer Japan) that improves the adhesion of the inorganic spherical particle-containing heat ray shielding paint to the outer surface of the body of a white helmet made of ABS resin (product name: MN-1 type manufactured by Yamazaki Kogyo Co., Ltd.) Central Research Laboratory Co., Ltd.) was applied with a coating thickness of 40 μm, dried at room temperature at 24 ° C. for 3 hours, and then heat-shielding paint containing inorganic spherical particles (product name: Adgreen Coat product number: TG-09 Japan Central Research Laboratory) Co., Ltd.) was applied at a coating thickness of 50 μm and dried at room temperature of 24 ° C. for 3 hours, and then the inorganic spherical particle-containing heat ray shielding coating was applied again at a coating thickness of 50 μm and dried at room temperature of 24 ° C. for 3 hours. A helmet with a surface layer excellent in heat ray shielding was produced.

  As Comparative Example 1, the same helmet as that used in Example 1 is used unprocessed.

  The helmet of Example 1 and the helmet of Comparative Example 1 were left in the field at the same date and at the same place so as to be exposed to the same amount of direct sunlight, and the temperature 5 cm below the top of each helmet was 4 hours every 6 minutes from noon. The measurement experiment was conducted. The result of the temperature difference measurement experiment in this heat ray shielding performance is shown in Table 1, and a graph is shown in FIG. 2 to facilitate comparison of the difference in heat ray shielding performance. The measurement position 5 cm below the inner crown is assumed to be the head position at the time of wearing, and below that, it is above the hammock that is the helmet interior and has little effect on the wearer.

The following table is a measurement result table of temperature change in which the heat ray shielding safety hat is Example 1 and the unprocessed helmet is Comparative Example 1.

    According to the temperature difference measurement experiment in the heat ray shielding performance, it was found that the measurement temperature of Example 1 was lower than the measurement temperature of Comparative Example 1 by about 3.8 ° C. on average and 5.8 ° C. at the maximum. From this test result, in the present invention, it was proved that the helmet of Example 1 was less affected by the heat rays contained in the direct sunlight than the helmet of Comparative Example 1, and had the effect of preventing the temperature rise inside.

The invention's effect

  As described in detail above, the helmet with excellent heat ray shielding properties of the present invention has an inorganic base layer thickness of 20 μm to 300 μm that increases the adhesion of the inorganic spherical particle-containing heat ray shielding paint on at least the outer side of the helmet body, and is inorganic. When the thickness of the heat ray shielding layer made of the spherical particle-containing heat ray shielding coating is 30 μm to 400 μm, it is possible to reliably prevent an increase in temperature inside the helmet without forming a heat insulating layer.

  The helmet excellent in heat ray shielding of the present invention is an optimum, simple and effective heat radiation countermeasure especially for a helmet wearer under hot weather in summer.

It is a cross-sectional schematic diagram of the present heat ray shielding safety heat protection cap. FIG. 5 is a graph showing a measurement result table of temperature change in which the present heat ray shielding safety hat is Example 1 and the unprocessed helmet is Comparative Example 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Helmet 2 Heat-shielding paint layer containing inorganic spherical particles 3 Paint layer that improves adhesion between helmet and heat-shielding paint containing inorganic spherical particles

Claims (4)

  A safety and heat-resistant cap characterized by sticking a heat-shielding material to the outer surface of the helmet.   2. The safety heat protection cap according to claim 1, wherein the heat ray shielding material to be applied to the outer surface of the helmet is applied as a paint.   3. The safety and heat protection cap according to claim 2, wherein a paint to which inorganic spherical particles are added is applied.   A safety and heat-resistant cap characterized in that inorganic spherical particles are added as a heat-shielding material to the base material of the helmet.

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