JPH02295729A - Buffer member - Google Patents

Abstract

PURPOSE:To easily and inexpensively enhance capacity by coating the entire surfaces of the recessed and protruding parts of a sheet having a recessed and protruding structure and provided with protruding parts formed from air bubble parts with plastic and/or rubber. CONSTITUTION:A sheet 1 can be formed by utilizing a base material such as polyethylene or nylon and there is no special limit in the shape of the air bubble parts of the sheet, the height of the protruding parts thereof and the distance between the protruding parts thereof. A coating material 2 composed of plastic and/or rubber is present on the air bubble part side of the sheet 1 and both of them are closely adhered to each other. As the base material of the coating material, plastic such as polyvinyl chloride, polyurethane or polyethylene and rubber such as liquid polybutadiene or liquid silicone rubber showing a flowable state at the time of the adhesion to the sheet and capable of being solidified by heating or cooling can be used. In case of polyvinyl chloride, a sol prepared by adding a plasticizer to polyvinyl chloride is allowed to flow to the air bubble parts of the sheet 1 to be gelled by heating and, in case of polyethylene, molten polyethylene is allowed to flow on the sheet 1 to be solidified by cooling. Further, liquid rubber is fixed by crosslinking under heating.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a buffer member suitable for use in various sports equipment, composite soundproof flooring materials, industrial shock absorbing parts, and the like.

[Prior Art] Conventionally, air has been used as a shock absorbing member with the highest performance. As a method of utilizing this, for example, an air mat having a large number of air bubbles called an air cap is widely used. However, if a large impact is applied to this, it will burst and its performance will be completely lost, limiting its range of use. On the other hand, it is known that by adding an uneven pattern to a molded product such as rubber or plastic, it is possible to produce the same cushioning effect as when air bubbles are provided. but,
For this purpose, a mold with a concavo-convex pattern is required, which increases the cost of the molded product.

[Problems to be Solved by the Invention] An object of the present invention is to provide a shock absorbing member with improved performance easily and inexpensively.

[Means for Solving the Problems] The gist of the present invention resides in a cushioning member formed by covering the entire surface of the uneven portion of a sheet having an uneven structure and whose convex portions are formed by air bubbles with plastic and/or rubber. . The details will be explained below.

FIG. 1 is a schematic diagram showing a cross section of the buffer member of the present invention. A covering material 2 made of plastic and/or rubber is present on the bubble side of the sheet having bubbles, and both are in close contact with each other.

The sheet 1 can be made of a commercially available material such as polyethylene or nylon, which is called an air cap, and can be made of a material that is made of a commercially available material such as polyethylene or nylon. Convex height,
The distance between the convex portions, etc. are not particularly limited.

The material for the covering material 2 is preferably plastic and/or rubber, which is in a fluid state when brought into close contact with the sheet 1 and is fixed by heating or cooling. The fluid state here refers to the solution, sol, or molten state of the material. Further, fixation due to heating refers to gelation, aggregation due to solvent scattering, or crosslinking, etc., and fixation due to cooling refers to movement due to temperature from a fluid region to a rubber region/glass region.

Specifically, as the covering material 2, for example, plastics such as polyvinyl chloride, polyurethane, urethane, and polyethylene, and rubbers such as liquid polybutadiene and liquid silicone rubber can be used. In the case of polyvinyl chloride, a sol containing a plasticizer may be poured onto the air bubbles of sheet 1 and heated to gel, while in the case of polyethylene, a molten sol may be poured over sheet 1 and cooled to solidify. Good too. Furthermore, if it is a liquid rubber, it can be fixed by thermal crosslinking. However, when attaching the covering material 2 to the sheet 1, the sheet 1 may melt and deform due to the heat of the covering material 2 or the heat during the fixing process, causing bubbles to burst, or the covering material 2 may It becomes a problem if it causes decomposition. Therefore, the balance between the material of the sheet 1 and the temperature during coating is important.

For example, in the case of sheet 1 made of polyethylene, 130
Processing at temperatures below ℃ is desirable. On the other hand, when it is made of nylon, the temperature is preferably 200°C or less.

In the buffer member of the present invention, a part of the covering material 2 can have fluidity. In other words, this shows a state in which the outer surface of the coating material 2 is solidified while the interior of the coating material 2 remains fluid. For example, if liquid rubber is poured onto the coating material 2, a crosslinking agent and a catalyst are applied to its surface, and then heated and cured, only the surface will be thermally crosslinked, and the inside will remain fluid. Furthermore, if polyvinyl chloride sol is used, by adjusting the heating time after it flows onto the sheet 1, it is possible to gel the surface and leave the inside as a sol.

The performance of the shock absorbing member of the present invention is such that when the entire covering material 2 is fixed, there is little deformation during buffering, and even if the bubble portion ruptures, its shape remains, so there is no need to worry about the bubble portion bursting. Moreover, after molding, it can be cut to an appropriate size and used. On the other hand, when only the surface of the coating material 2 is solidified,
Its performance as a shock absorbing member is higher than when the entire structure is fixed.

Therefore, it is preferable to change the state of the cushioning material 2 depending on its use.

The buffer member of the present invention can also be used in a state in which two or more layers are bonded and laminated.

Moreover, there is no problem even if additives such as mica, talc, and carbon are added to the coating material 2.

FIG. 2 shows an example of use as a wooden flooring material in which plywood of 3sus and 5mm thickness is laminated on both sides of the buffer member of the present invention.

[Examples] Further, the present invention will be explained in detail using Examples, but the present invention is not limited thereto.

Example 1 At the bottom of a stainless steel vat measuring 29Q x 170 x 30us, a nylon sheet with a diameter of 7 mm and three heights having air bubbles with a center spacing of 10 mm was placed so that the air bubbles were on the upper side. There is polyvinyl chloride (
Ryuron Paste R-725. (manufactured by Tosoh) 550g
was dispersed in 330 g of dioctyl phthalate, and heated in a constant temperature bath at 190°C for 7 minutes to form a gel.
The desired buffer member was obtained.

Comparative Example 1 990 g of polyvinyl chloride sol having the same formulation as in Example 1 was poured into a stainless steel vat measuring 290 x 170 x 30 mm, and gelatinized by heating in a constant temperature bath at 190°C for 8 minutes to reduce the thickness. Ninety pieces of vinyl chloride sheets were obtained.

Example 2 A stainless steel bat measuring 290 x 170 x 30 mm had a diameter of 7 mm and a height of 3 m at the bottom.
Polyethylene sheets containing +e air bubbles were laid out with the air bubbles facing upward. Hexamethylene diisocyanate (HDI) is applied to the inner surface of the bat and the air bubbles of the sheet.
), then liquid polybutadiene (Poly b
d R-45HT, manufactured by Idemitsu Arco ■) to which 1 g of dibutyltin dilaurate was added was poured. Furthermore, MDI was coated on the upper surface of the liquid rubber layer and cured by heating in a constant temperature bath at 120° C., thereby obtaining the desired buffer member having a thickness of 9 am and having a cured surface of the liquid rubber.

Example 3 The same polyethylene sheet as in Example 2 was spread on the bottom of a stainless steel bat measuring 290 x 170 x 30 mm. On top of that, add 350g of liquid polybutadiene to HD12.
A mixture of 3.5 g and 1 g of dibutyltin dilaurate was poured into the tank. This was heated and cured in a constant temperature bath at 120° C. to obtain a desired buffer member with a thickness of 9III1 in which the liquid rubber was cured.

Comparative Example 2 HDI was installed on the inner bottom and inner surface of a stainless steel bat with a size of 290 x 170 x 30 m+s.
400 g of liquid rubber with the same composition as in Example 2 was poured, and MDI was further applied on the top surface of the liquid rubber layer and cured by heating in a constant temperature bath at 120° C. to form a surface-hardened liquid rubber with a thickness of 9 mm. Got a sheet.

Comparative Example 3 400 g of liquid rubber having the same composition as in Example 3 was poured into a stainless steel vat measuring 290 x 170 x 30 mm, and heated and cured in a constant temperature bath at 120°C to form a liquid rubber with a thickness of 9lII1. I got a rubber seat.

Measurement of shock absorption performance of shock absorbing members A 3 am thick rubber plate was placed on a 30 mm thick steel plate.
On top of this, the buffer members obtained in Examples 1 to 3 and Comparative Examples 1 to 3, in which two layers of polyethylene sheets having air bubbles were laminated to a thickness of 7 mm, were placed. At the same location, there is a vibration pickup (BRUE) on the back side of the iron plate.
A steel ball to which a force transducer (manufactured by Briiela K.K., Ltd.) was attached was dropped from a height of 300 degrees above the buffer member. Table 1 shows the buffer acceleration measured using the vibration pick-up and force transducer.

[Effects of the Invention] As is clear from the above description, according to the present invention, a shock absorbing member with improved performance can be easily and inexpensively obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a cross section of the buffer member of the present invention. Moreover, FIG. 2 is a schematic diagram showing a cross section of a wooden flooring material using the buffer member of the present invention. 1...Sheet having air bubbles 2...Coating material 3...Plywood

Claims (1)

[Scope of Claims] 1. A cushioning member formed by covering the entire surface of the uneven portion of a sheet having an uneven structure with the convex portions formed by air bubbles with plastic and/or rubber. 2. Claim 1 in which a part of the coating material has fluidity
Cushioning member.