JP-2026075769-A - Shock-absorbing material

Abstract

[Problem] To provide a cushioning material that can be easily installed while suppressing whitening, by having a core material made of tarpaulin and foam in which the content of specific inorganic particles is 5.0 parts by mass or less. [Solution] The cushioning material comprises a foam core and tarpaulin in that order, wherein the tarpaulin contains 5.0 parts by mass or less of inorganic particles with an average particle diameter of 1.00 μm or more, calculated from the specific surface area measurement results of the air permeability method in accordance with JIS M-8511, per 100 parts by mass of resin component. [Selection Diagram] Figure 1

Inventors

• 佐藤 寛人

Assignees

• 株式会社イノベックス

Dates

Publication Date

20260511

Application Date

20241023

Claims (7)

1. It has a core material made of foam and tarpaulin in that order, The tarpaulin is a cushioning material in which, per 100 parts by mass of resin component, the content of inorganic particles with an average particle diameter of 1.00 μm or more, calculated from the specific surface area measurement results of the air permeability method in accordance with JIS M-8511, is 5.0 parts by mass or less.
2. The cushioning material according to claim 1, wherein the foam contains at least one of the following: urethane resin, ethylene resin, propylene resin, vinyl chloride resin, styrene resin, melamine resin, and epoxy resin.
3. The cushioning material according to claim 1, wherein the tarpaulin contains at least one of polyethylene resin, polypropylene resin, and polyvinyl chloride resin as the resin component.
4. The cushioning material according to claim 1, wherein the tarpaulin further contains a flame retardant.
5. The cushioning material according to claim 1, wherein the tarpaulin further contains one or more selected from plasticizers, colorants, antistatic agents, antioxidants, ultraviolet absorbers, lubricants, liquid stabilizers, and light stabilizers.
6. The cushioning material according to claim 1, wherein the tarpaulin is the outermost surface.
7. A cushioning material according to claim 1, for outdoor use.

Description

From the perspective of ensuring the safety of athletes, the application of foam materials to fences and other structures has been carried out. Known methods include the application of rubber fences (Patent Documents 1 and 2) in which a rubber composition layer is formed on a foam material, and the application of a foam cushioning material layer to the surface of a concrete wall, followed by the application of a high-viscosity mixture of a main agent and a hardener at low pressure using a spraying method to form a surface layer (Patent Document 3). Furthermore, tarpaulin was known to be used as a material for roofs and awnings of large facilities such as stadiums, and for sunshade tents for shops (Patent Document 4). Japanese Patent Application Publication No. 04-222781Japanese Patent Publication No. 2000-025137Japanese Patent Application Publication No. 08-086127Japanese Patent Publication No. 2014-223044 This is a schematic diagram of an example of the cushioning material of this embodiment.This is a micrograph of the whitened area of the tarpaulin in Comparative Example 1.This is a schematic diagram of the tarpaulin used in this embodiment.This is a schematic diagram showing an example of installing buffer material on a structure (plane).This is a schematic diagram showing an example of installing buffer material on a structure (cylindrical column). Patent Document 1 describes a rubber fence having a foamed cushioning layer, a reinforcing layer, and a dynamically vulcanized rubber composition layer in that order. Patent Document 2 describes a wall cushioning material in which a sheet made of polyester is attached to the surface of a polyethylene foam, and a rubber sheet is attached to this sheet. In both cases, the rubber material is placed on the outermost surface of the foam. When the rubber material is placed on the outermost surface, it becomes difficult to apply designs to the surface due to poor printing properties. Also, since the rubber material is inferior in terms of strength, problems such as tearing can occur when subjected to strong impact, and especially when used outdoors, chalking occurs, resulting in deterioration of appearance and durability. Furthermore, sulfur derivatives may be leached out by rainwater. Patent Document 3 describes an impact-absorbing fence in which a urethane elastomer layer is sprayed onto the surface of a foamed cushioning material layer to form a urethane layer. However, because this method involves spraying urethane elastomer, it cannot be installed in enclosed spaces such as indoors. Even outdoors, it becomes extremely difficult to ensure a consistent thickness across the entire fence surface, especially when the fence area is large. Furthermore, since the surface of the urethane layer is formed after installation, it is difficult to apply any decorative elements to the surface, and it is impossible to obtain a highly smooth surface in the first place. Patent Document 4 describes tarpaulin used for roofs and eaves of large facilities such as sports stadiums. Tarpaulin is suitable for outdoor use due to its excellent durability, waterproofing, and stain resistance, and its superior printability allows for surface designs to be applied through printing. However, when scratched by strong forces such as collisions with athletes or contact with jigs during construction, the scratches turn white, and the white linear scratches become noticeable. Figure 2 is a micrograph observing the whitening (hereinafter, "whitening" refers to the white lines remaining after scratches, as shown in Figure 2). The whitening can be observed, for example, by adding a black coloring agent to the resin layer of tarpaulin to make it black, as in the initial state 20, and then observing the scratches caused by rubbing it multiple times with a 6H pencil. The left half of the micrograph in Figure 2, the initial state 20, is an area that has not been rubbed, while the white linear areas on the right half show the whitened state 21 after scratches made with a 6H pencil. Even if scratches occur, if they do not whiten, the scratches are not noticeable because they are the original color. The cushioning material of this disclosure, comprising a foam core and a tarpaulin with an adjusted content of inorganic particles having a specific average particle size, has been found to protect against impact during collisions with athletes and suppress whitening. Furthermore, the cushioning material has been found to have excellent workability. Additionally, having the tarpaulin on the outermost surface of the cushioning material provides excellent durability, waterproofing, and stain resistance, making it suitable for outdoor use. Moreover, its excellent printability allows for the application of designs to the surface through printing, which is also preferable. The following describes the cushioning materials related to this disclosure, but is not limited to the examples provided below. In this disclosure,