JP2003328308A - Ice/snow accretion preventing rubber mat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber mat preventing the accretion of ice/snow on the mat and having moderate hardness which facilitates the crush of ice/snow accretion. <P>SOLUTION: This ice/snow accretion preventing rubber mat provided with antislip design is formed of synthetic resin whose hardness in a durometer hardness test is in a range of A10-A40, and a liquid additive having an ice/snow accretion preventing effect on the surface bleeds under the condition of 5°C or less. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber mat, and more particularly to a rubber mat for preventing snow accretion on the surface thereof in winter.

[0002]

2. Description of the Related Art In cold regions during the winter, pedestrians often fall down outdoors due to icy snow adhering to roads, stairs, etc., and even indoors such as frozen warehouses. In order to prevent such a fall accident, various mats for preventing ice accretion and snow have been provided.

For example, Japanese Utility Model Publication No. 3038126 discloses a detachable convex portion which is composed of three layers of a surface rubber layer, an intermediate sponge layer and a back rubber sheet layer and which is fitted with a concave portion provided on a stair tread. Is disclosed in the backside rubber sheet layer, there is disclosed a frost and snow prevention mat for stairs.

However, in the case of such a mat having a laminated structure containing a so-called sponge, there is a problem in the durability of the sponge portion, so that the application range of such a rubber mat is limited to only a part.

Further, in the case of a rubber mat having a structure having a hollow layer inside, since the manufacturing cost is inevitably high, the versatility is not high.

[0006] Further, there is a rubber mat which is said to form an air layer inside by using a rubber chip and is said to be unlikely to be iced. It is extremely difficult to remove the ice and snow that has become stuck in.

[0007] As the rubber material, in consideration of cold resistance and cost, natural rubber (NR) alone or a mixture of synthetic rubber mainly composed of natural rubber is often used. It had poor weather resistance and had a durability problem of cracking after several years of use.

Further, in the conventional rubber mat, when the temperature rises, the hardness decreases (softens), and conversely, when the temperature decreases, the hardness increases (hardens). Specifically, when the hardness in the durometer hardness test was used as an index, a hardness increase of +10 to +20 was observed. Therefore, the deformation of the rubber mat due to the load is not sufficient especially in winter, and there is a problem that the icing snow cannot be sufficiently crushed and removed.

In addition, these conventional rubber mats have no technical idea of making the surface itself hard to icy (snow).

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above conventional problems. That is, the object of the present invention is to prevent ice and snow from sticking to the mat by bleeding the liquid additive having the effect of preventing icing and snow from adhering to the surface of the rubber mat, especially under conditions of an air temperature of 5 ° C. or lower, An object of the present invention is to provide a rubber mat having an appropriate hardness that allows the frosted snow to be easily crushed when added.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a rubber mat for preventing ice accretion and snow, which is provided with an anti-slip design. In order to solve the above problems, the ice-and-snow prevention rubber mat of the present invention is
It consists of rubber whose hardness in the durometer hardness test is in the range of A10 to A40, and at a temperature of 5 ° C or less,
It is characterized in that a liquid additive having an effect of preventing icing and snow bleeds on the surface thereof.

The ice-and-snow-prevention rubber mat of the present invention is a rubber mat having a non-laminated structure, and this rubber contains a liquid additive having an ice-and-snow-prevention effect.

The liquid additive having the effect of preventing icing and snow, as used herein, means that it bleeds on the surface of the rubber mat at a low temperature,
It is also a substance that has no affinity for water.

Here, "bleeding" refers to a phenomenon in which a liquid additive film having the effect of preventing ice accretion and snow is "embossed" on the surface of a rubber mat for preventing ice accretion and snow to form a film of the liquid additive. That is, it means that the liquid additive contained in the ice-and-snow prevention rubber mat migrates (exudes) to the surface of the rubber mat to form a film.

According to the constitution of the rubber mat for preventing ice accretion of the present invention, compared to the rubber mat having the conventional laminated structure, the liquid additive bleeds to the surface at a low temperature, so that the ice accretion is prevented. It has an unprecedented remarkable effect of preventing and facilitating peeling. Further, since it also has an appropriate hardness, it is possible to effectively crush and remove the frosted snow which is in a state of being easily separated from the surface of the rubber mat. Therefore, it is possible to provide an extremely safe rubber mat.

The ice-and-snow preventing rubber mat of the present invention is mainly composed of synthetic rubber as a raw material, preferably ethylene propylene rubber (EPDM), and has a thickness of 3 to 3.
It is good to set it to 50 mm.

In this way, it is possible to provide a rubber mat for preventing ice accretion and snow, which is excellent in weather resistance and durability. In addition, cost performance is improved.

Further, in the ice-and-snow-preventing rubber mat of the present invention, the rubber preferably contains a liquid additive having an ice-and-snow-preventing effect in a suitable amount within the range of 40 to 44% by weight.

With such a blending ratio, bleeding does not occur on the surface of the ice-and-snow-preventing rubber mat in the summer, and the liquid additive having the ice-and-snow-preventing effect can be bleed only when the temperature drops. Therefore, in the winter when the temperature decreases, for example, the icing snow can be effectively released from the surface of the rubber mat, so that the crushing and removal are facilitated, and, for example, bleeding does not occur in the summer when the temperature rises. The risk of slipping, etc. can be eliminated.
That is, it is possible to provide a rubber mat that is safe for use throughout the year.

The liquid additive is not particularly limited as long as it has a function of lowering the hardness of rubber and bleeds on the surface of the rubber mat when the temperature drops. In the ice-and-snow-preventing rubber mat of the present invention, the liquid additive having the ice-and-snow-preventing effect is preferably a paraffin oil.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the drawings only schematically show the shapes, sizes, and positional relationships of the respective constituent components to the extent that the present invention can be understood, and the present invention is not particularly limited thereby.

FIG. 1 is a schematic plan view (A), BB for explaining the shape of a rubber mat for preventing ice accretion and snow of the present invention.
It is a schematic sectional view by a broken line (B) and a schematic sectional view (C) when bleeding occurs.

The ice-and-snow-prevention rubber mat 10 of the present invention is provided with a design in which a plurality of substantially cylindrical projections 12 are regularly arranged on the surface thereof (FIG. 1).
(A)).

The hardness of the rubber forming the ice-and-snow-prevention rubber mat 10 of the present invention is such that a person's foot has an ice-and-snow-prevention rubber mat 1
When 0 is pressed, it should have a hardness suitable for crushing and removing icing snow on the surface.

Specifically, on the premise that the hardness does not easily change with a temperature change, the softening action of the rubber when the temperature rises and the durability thereof decrease, and the hardening action and the wearing of the rubber when the temperature drops. Although it is determined in consideration of the crushing and removing action of ice and snow, it is preferably A10 to A4 in the durometer hardness test specified in JIS K6253.
The hardness is preferably in the range of 0.

In the anti-icing rubber mat 10 of the present invention, the liquid additive 20 having the effect of preventing icing and snow is contained in the rubber (FIG. 1 (A)).

The thickness d of the ice accretion preventing rubber mat 10 of the present invention is determined in consideration of the displacement amount due to the load applied to the mat, that is, the effective crushing and removing action of the ice accretion and the cost, etc., but it is preferable. Is preferably in the range of 3 to 50 mm.

Under low temperature conditions, the liquid additive 20 bleeds on the surface of the ice-and-snow preventing rubber mat 10 including the top surface of the convex portion 12 to form a film 22 of the liquid additive (FIG. 1).
(C)).

As a suitable addition amount of the liquid additive 20, bleeding occurs at low temperature, that is, in winter,
The amount should be such that bleeding does not occur when the temperature rises. Preferably, bleeding occurs under conditions of 5 ° C. or lower, but it is preferable that the bleeding does not occur at temperatures higher than 5 ° C.

Further, for example, the bleeding generated at 5 ° C. or lower is preferably set as an amount that is absorbed and disappears inside the rubber mat under the condition of a temperature higher than 5 ° C.

FIG. 2 is a schematic plan view for explaining an example of a design different from that of FIG. 1 which is suitable for application to the ice-and-snow-preventing rubber mat of the present invention.

A plurality of stripe grooves 14 are regularly provided on the surface of the ice-and-snow preventing rubber mat 10.

The design applicable to the ice-and-snow-preventing rubber mat of the present invention is not limited to those shown in FIGS. 1 and 2, and conventionally used designs can be applied. Specifically, in addition to the anti-slip function, a design that can be easily crushed and removed by the load of icing snow can be appropriately selected.

The ice-and-snow-preventing rubber mat of the present invention can be manufactured by a conventionally known manufacturing process. Specifically, for example, the following steps, a step of determining the compounding ingredients and the compounding amounts of the rubbers, a step of weighing each of them, a step of mixing in an internal mixer, a step of distilling the rubber into a sheet, a sheet The step of cutting, packing the cut sheet-shaped rubber in a rubber mat mold (mold), and using a heating press machine (for example, 15
Press vulcanization (at 0 ° C. for 30 minutes) and removal of the product from the mold.

[0035]

EXAMPLE A plurality of samples of rubber ice mats for preventing ice accretion were manufactured by changing the addition amount of the ice accretion preventive agent according to the above-mentioned process. Examples 1 to 5 will be described below as specific examples of the ice-and-snow preventing rubber mat.

The mixing ratios (parts by weight) of the mixing components of Examples 1 to 5 are shown below in Table 1.

[0037]

[Table 1]

In these examples, the raw materials (each compounding component) are appropriately selected within the range of not impairing the object of the present invention, that is, the physical properties such as weather resistance and hardness of the rubber to be produced and the compatibility with rubber. can do.

In these examples, paraffinic oil was used in particular, but paraffinic oil, naphthenic oil and aromatic oil can be used, for example, in mineral oil type.
Examples of vegetable oils include castor oil and rapeseed oil. Also, silicone oil can be used.

As the sulfenamide accelerator, N-cyclohexyl-2-benzothiazyl-sulfenamide, N-oxydiethylene-2-benzothiazyl-sulfenamide and the like can be used. Examples of the thiazole accelerator include 2-mercaptobenzothiazole and dibenzothiazyl disulfide.

In these examples, as the raw materials (each compounding ingredient), those which are distributed in the market can be used. For example, ethylene propylene rubber (EPD
M) as Keltan 7631A (Idemitsu DSM
Manufactured by Sansera NOB (manufactured by Sanshin Chemical Co., Ltd.) as a sulfenamide-based accelerator, and Sanserra M (manufactured by Sanshin Chemical Co., Ltd.) as a thiazole accelerator by paraffin oil As Diana Process Oil PW
-90 (made by Idemitsu Kosan Co., Ltd.) is available.

The rubber mats for preventing ice accretion and snow of Examples 1 to 5 were
Using a constant temperature bath, from 20 ℃, 10 ℃, 5 ℃, 0 ℃,-
The temperature was gradually lowered so as to reach 5 ° C, -10 ° C, and -20 ° C, and the occurrence of bleeding was visually confirmed 1 hour after reaching each set temperature. Also, after cooling down,
The temperature was returned to ℃ and the occurrence of bleeding was confirmed again.

The results are shown in Table 2 below.

[0044]

[Table 2]

In the table, "-" means "no bleed occurrence". “Δ” represents “some bleeding occurred”.
“O” represents “there is a bleed occurrence” “A” means “a large amount of bleeding occurred”.

As can be seen from Table 2, 90 to 110 parts by weight (about 40% by weight) of Examples 2 to 4, that is, paraffinic oil, which is a liquid additive having an effect of preventing snow accretion, is added. Bleed started to occur at about 5 ° C. in the rubber ice-prevention rubber mat containing 44% by weight).

Further, in Examples 2 to 4, bleeding did not occur when the temperature was returned to 20 ° C. after cooling was completed. That is, it was found that when the temperature was changed from the low temperature condition to the 20 ° C. condition again, the bleeded liquid additive was absorbed and retained from the surface of the rubber mat to the inside.

At this time, among the conditions in Table 2 above,
20 ℃ after gradually lowering the temperature to 20 ℃ and -20 ℃
The durometer hardness test was performed under the two conditions of returning to d.

The results are shown in Table 3.

[0050]

[Table 3]

As can be seen from Table 3, the ice-and-snow-preventing rubber mat of the present invention can be kept at 20 ° C. and after cooling.
It can be seen that there is almost no change in hardness. That is, it can be seen that the liquid additive exuded on the surface of the rubber mat due to bleeding during cooling was reabsorbed inside the rubber mat.

Thus, from the results of Table 2, Examples 2 to 2
It can be seen that the mixing ratio of the liquid additive having the effect of preventing snow accretion of No. 4 is suitable.

[Brief description of drawings]

FIG. 1 is a schematic plan view (A) for explaining the shape of a snow mat for preventing ice accretion of the present invention (A), a schematic cross-sectional view taken along the line BB (B), and when bleeding occurs. It is a schematic sectional drawing (C).

FIG. 2 is a schematic plan view for explaining an example of a design suitable for application to the ice-and-snow preventing rubber mat of the present invention.

[Explanation of symbols]

10: Rubber mat to prevent ice and snow 12: convex part 14: Stripe groove 20: Liquid additive having an effect of preventing icing and snow 22: Bleed liquid additive

Claims (4)

[Claims] 1. An anti-icing and snow-preventing rubber mat provided with an anti-slip design, comprising synthetic rubber having a hardness in the range of A10 to A40 in a durometer hardness test, and having a surface thereof at a temperature of 5 ° C. or less. A rubber mat for preventing icing and snowing, wherein a liquid additive having an icing and snowing preventing effect bleeds. 2. The synthetic rubber contains ethylene propylene rubber (EPDM) as a main component and has a thickness of 3 to 50 mm.
The rubber mat for preventing icing and snow according to claim 1, wherein 3. The synthetic rubber contains 40 parts of the liquid additive.
The rubber mat for preventing icing and snow formation according to claim 2, wherein the rubber mat contains ˜44% by weight. 4. The anti-icing snow mat according to claim 3, wherein the liquid additive is a paraffinic oil.