JPH0361797B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a flooring material with improved slip resistance. In general, rubber flooring is often installed on the floors of vehicles, buildings, etc. from the viewpoints of protecting the floor, improving the appearance, improving heat retention, feeling of walking, and reducing walking noise. One of the most important properties is slip resistance, and this slip resistance can be said to be one of the most important properties for flooring materials in terms of pedestrian safety. Conventionally, the above-mentioned flooring materials have been made of natural rubber or synthetic rubber with fillers such as calcium carbonate, clay, etc.
There are those that are rolled with added pigments, and those that have rubber-like elasticity made of vinyl chloride, but all of them have a smooth surface and have low slip resistance, especially when the floor is wet. There is a problem that it becomes easy to slip. Incidentally, it is common practice to improve slip resistance by adding unevenness to the surface of the flooring material, but unevenness can make it uncomfortable to walk on, and dust can accumulate in the recesses, damaging the appearance. This problem occurs and is not very desirable. In view of this, the present invention provides a flooring material whose main component is a rubber-like substance, and by adding innovation to the filler, the flooring material exhibits excellent slip resistance both when dry and when wet. The purpose is to ensure walking safety. The flooring material according to the present invention has an average particle diameter of 0.1 to 2.0 mm based on 100 parts by weight of a rubbery substance, that is, a crosslinkable rubber or a thermoplastic rubbery polymer, or a mixture of the above-mentioned rubber and rubbery polymer.
1 to 15 parts by weight of cork powder is added,
It is characterized by exhibiting high slip resistance. Crosslinkable rubbers include NR (natural rubber),
SBR (styrene/butadiene rubber), BR (butadiene rubber), NBR (nitrile/butadiene rubber),
CR (chloroprene rubber), EPR (ethylene propylene rubber), and other materials in which three-dimensional network chains are formed by crosslinking agents such as sulfur, metal oxides, peroxides, and resins are applicable. As the thermoplastic rubbery polymer, what is generally called a thermoplastic elastomer is used, such as SBS type teleblock made of styrene (S) and butadiene (B), multiblock copolymer, high styrene rubber, and 1,2-polybutadiene. Ru. As the cork powder, a mechanically pulverized natural product is used. However, the average particle size of this cork powder is set in the range of 0.1 to 2.0 mm.The reason is that if the average particle size is less than 0.1 mm, the slip resistance cannot be sufficiently improved; The diameter is
This is because if it exceeds 2.0 mm, the smoothness of the flooring material surface will be impaired, and cork particles exposed on the flooring material surface will come off during use. On the other hand, the cork powder with an average particle size of 0.1 to 2.0 mm is added in an amount of 1 to 15 parts by weight per 100 parts by weight of the rubbery substance.The reason is that less than 1 part by weight does not sufficiently improve slip resistance. Moreover, if the amount exceeds 15 parts by weight, the mechanical properties will deteriorate and the surface will become rough due to walking, resulting in a decrease in durability. Of course, in addition to the above-mentioned cork powder, the flooring material according to the present invention may contain other additives such as reinforcing agents, fillers, softeners, vulcanizing agents, vulcanization accelerators, and vulcanization accelerators as necessary. It can be added selectively. Examples of the present invention will be described below. Examples 1-5 The common formulations for this example are shown in Table 1.

[Table] In the above table, the high styrene rubber is HSR0061 manufactured by Japan Synthetic Rubber Co., Ltd. In the above-mentioned common formulation, tests regarding slip resistance (slip resistance) and tensile strength were conducted for each of Examples in which the amount of cork powder added was changed and Comparative Example 1 in which no cork powder was added. The test results are shown in Table 2.

[Table] The average particle diameter of cork powder is the same for each example.
It is 0.9mm. To create the test material, cork powder was put into an internal mixer with other additives and kneaded, and this kneaded material was made into a 3.0 mm thick sheet and pressurized and heated using a press. . For vulcanization, pressing was carried out at a temperature of 160°C for [vulcanization time of 90% of the rheometer curve + 5 minutes]. The slip resistance coefficient D was determined using a JISA1407 pendulum slip resistance tester.
Moreover, the tensile strength was measured based on JISK6301. From Table 2 above, it can be seen that the addition of cork powder greatly contributes to improving the slip resistance, that is, the slip resistance. Here, considering the relationship between cork powder and slip resistance, when the floor material receives force from the bottom of the footwear, the part where cork particles are present has a different modulus than other rubbery parts, so the stress as a whole is It is recognized that this unevenness, combined with the unevenness of the sole of the footwear, increases the apparent coefficient of friction. In other words, when the flooring material is deformed, it is thought that the effect is similar to the presence of an uneven pattern on the surface of the flooring material due to cork powder. Examples 6 and 7 Examples 6 and 7 examine the effect of the average particle size of cork powder on slip resistance.The common formulations of both examples are as shown in Table 1 above. The amount of powder added was 5 parts by weight in each case. Therefore, in Example 6, the average particle diameter of cork powder was 0.1 mm, and in Example 7, the average particle diameter of cork powder was 1.2 mm, and test materials were prepared in the same manner as in the previous examples. The results of measuring D are shown in Table 3 together with the data of Example 3.

[Table] As shown in Table 3, it can be seen that the sliding resistance of cork powder increases as the average particle diameter increases. Examples 8 to 11, Comparative Examples 2 to 5 In this example, slip resistance was tested using a rubber-like material different from that of the previous example. is in Table 4,
The slip resistance test results are shown in Table 5.

[Table] In Table 4 above, NBR N230S, BR01,
Both RB820 and HSR0061 are manufactured by Japan Synthetic Rubber Co., Ltd. In addition, the average particle diameter of cork powder was 0.9 mm in both Examples and Comparative Examples.

[Table] Tables 4 and 5 show that no matter which rubbery material is used, the slip resistance can be improved by adding cork powder. It can be seen that relatively good slip resistance can be obtained in combination with rubber or in combination with natural rubber, high styrene rubber and butadiene rubber. Example 12 In this example, a pattern is applied to a flooring material, and the flooring material is composed of A material and B material of different colors. The compositions and blending ratios of Material A and Material B are shown in Table 6.

【table】

[Table] In Table 6, the average particle size of cork powder is 0.9
mm. Material A and material B are kneaded separately and then combined in an appropriate ratio and molded. As a result, a flooring material in which a pattern (for example, a marble-like pattern) is applied to material A with material B is obtained. When we measured the slip resistance coefficient of the above flooring materials, we found that
The value was 0.43 when dry and 0.24 when wet, indicating good slip resistance. As described above, according to the present invention, since an appropriate amount of cork powder with an average particle size of 0.1 to 2.0 mm is added to the rubber-like material, the modulus of the flooring material is different between the part where cork powder is present and the part where cork powder is not present. When the sole of the footwear deforms due to force, the cork powder exhibits the same effect as unevenness on the surface of the flooring material, resulting in an excellent effect of improving slip resistance. .

Claims (1)

[Claims] 1. Average particle size is 0.1 to 2.0 mm based on 100 parts by weight of crosslinkable rubber, thermoplastic rubbery polymer, or mixture of the above rubber and rubbery polymer.
A flooring material containing 1 to 15 parts by weight of cork powder.