JPH0361798B2 - - 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 has been developed to improve the additives of flooring materials mainly composed of rubber-like substances so that the flooring materials exhibit excellent slip resistance both when dry and when soaked. 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.
It is characterized in that 1 to 10 parts by weight of cork powder and 1 to 15 parts by weight of polyisobutylene or a copolymer containing isobutylene as a main component are added. Crosslinkable rubbers include NR (natural rubber),
SBR (styrene/butadiene rubber), BR (butadiene rubber), NBR (nitrile/butadiene rubber),
CR (chloroprene rubber), EPR (ethylene propylene rubber), etc. Sulfur, metal oxides, peroxides,
A material in which a three-dimensional network chain is formed by a crosslinking agent such as a resin is applied. 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, cork powder with an average particle size of 0.1 to 2.0 mm is added in an amount of 1 to 10 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 10 parts by weight, the mechanical properties will deteriorate and the surface will become rough due to walking, resulting in a decrease in durability. In particular, when the amount exceeds 10 parts by weight, a remarkable decrease in ozone crack resistance is observed. As the isobutylene polymer, polyisobutylene or a copolymer containing isobutylene as a main component, such as butyl rubber, which is a copolymer of isobutylene and isoprene, is used. The amount of isobutylene in the isobutylene polymer is set at 1 to 15 parts by weight per 100 parts by weight of the rubber-like material, because if it is less than 1 part by weight, the slip resistance cannot be sufficiently improved. If the amount exceeds 15 parts by weight, the amount of residual dents will increase, the scratch resistance and abrasion resistance will decrease, and the surface will become easily stained, leading to problems with properties other than slip resistance. This is because this is not desirable. In particular, when the amount exceeds 15 parts by weight, a significant increase in the amount of residual dents is observed. The desired amount of isobutylene is 3 to 10 parts by weight based on 100 parts by weight of the rubbery material. Of course, the flooring material according to the present invention includes, in addition to the cork powder and isobutylene polymer, reinforcing agents,
Other additives such as fillers, softeners, vulcanizing agents, vulcanization accelerators, and vulcanization accelerators may be appropriately selected and added as necessary. Examples of the present invention will be described below. Examples 1 to 5, Comparative Examples 1 to 9 The common formulations of the Examples and Comparative Examples are shown in Table 1.

[Table] In the above table, the high styrene rubber is HSR0061 manufactured by Japan Synthetic Rubber Co., Ltd. Examples 1 to 5 and Comparative Examples 1 to 9 were based on the formulations in Table 1, and the amounts of cork powder and isobutylene polymer added were set as shown in Tables 2 and 3. The Examples and Comparative Examples were tested for slip resistance, presence or absence of ozone cracking, and residual dents. The test results are shown in Tables 2 and 3.

【table】

[Table] In addition, the average particle size of cork powder is
It is 0.9mm. To prepare the test materials, the isobutylene polymer was mixed with the rubber-like substance, and the cork powder was mixed with other additives in an internal mixer. It was made into a sheet and was 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 measured using a JISA1407 pendulum slip resistance tester, and the ozone crack generation test was performed using an ozone concentration test.
Further, residual dents were measured based on JISA-1407 under the conditions of 50 pphm, 1% elongation, and 24 hours test time. In Table 2, Vistanec MML-80 is polyisobutylene manufactured by Exxon Chemical Co., Ltd., and in Table 3, butyl rubber is Butyl 268 manufactured by Japan Synthetic Rubber Company. From Table 2 above, it can be seen that both the addition of cork powder and the addition of isobutylene polymer independently contribute to improving the slip resistance. When cork powder is added, the modulus of the floor material differs between the part where cork powder is present and the rubbery part where it is not, so when force is applied from the sole of the footwear, the stress becomes uneven, causing unevenness on the sole of the footwear. Combined with this, the apparent coefficient of friction is increased. In other words, cork powder is recognized to have the effect of producing an effect similar to the presence of an uneven pattern on the surface of a flooring material when the flooring material receives force from the sole of footwear. On the other hand, isobutylene-based polymers are recognized to have the effect of absorbing and alleviating the impact energy that the floor material receives from the sole of the footwear, and suppressing the slip phenomenon caused by the repulsive energy. However, when only cork powder is added, ozone cracks occur as seen in Comparative Examples 5, 7, and 9, and the time until the ozone cracks occur becomes shorter as the amount of cork powder added increases. There was a tendency to On the other hand, when only the isobutylene polymer is added, as seen in Comparative Examples 4, 6, and 8, the residual dents tend to become larger as the amount added increases. On the other hand, in the examples, it was possible to prevent ozone cracking and reduce residual dents, as well as improve slip resistance. This is, for example, Example 3
As can be seen by comparing the data of Example 4 and Comparative Example 4, the addition of cork powder not only improves slip resistance but also contributes to reducing residual dents. As can be seen, this is because the addition of isobutylene-based polymers contributes to the prevention of ozone cracking. In other words, in the examples, the slip resistance improving effect and residual dent reduction effect of the cork powder, and the slip resistance improving effect and ozone crack prevention effect of the isobutylene polymer combine to create a slip resistant machine. It is recognized that the product exhibits characteristics that can satisfy both of the above-mentioned characteristics. In addition, in Example 5, butyl rubber was used instead of polyisobutylene as the isobutylene-based polymer, but as can be seen by comparing the data with Example 3, butyl rubber has better slip resistance than polyisobutylene. Although the contribution to improvement is somewhat low, it has a good value for residual dents. Examples 6 to 9, Comparative Examples 10 to 17 In this example, slip resistance, occurrence of ozone cracking, and residual denting were investigated using rubber-like materials different from those of the previous examples. be. The formulations of Examples are listed in Table 4, the formulations of Comparative Examples are listed in Table 5, the test results of Examples are listed in Table 6, and the test results of Comparative Examples are listed in Table 7.

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[Table] In Tables 4 and 5 above, NBR
N230S, BR01, RB820, and HSR0061 are all manufactured by Japan Synthetic Rubber Co., Ltd. Furthermore, the average particle diameter of the cork powder was 0.9 mm. Tables 4 and 6 show that no matter which rubbery material is used, the addition of cork powder and isobutylene polymer can improve slip resistance without causing ozone cracking or residual denting problems. ,
It is also seen that relatively good slip resistance can be obtained in the combination of natural rubber and high styrene rubber, or in the combination of natural rubber, high styrene rubber and butadiene rubber, as in Examples 6 and 8. Furthermore, from Tables 5 and 7, the relationship between isobutylene-based polymers and residual dents and the relationship between cork powder and ozone cracks can be clearly recognized, respectively, and such relationships can be seen in any rubbery substance. Recognize. As described above, according to the present invention, cork powder with an average particle size of 0.1 to 2.0 mm and isobutylene polymer are added in appropriate amounts to the rubber-like material, thereby preventing ozone cracking and residual dents. An excellent effect can be obtained in that slip resistance can be improved without increasing the slip resistance, that is, without sacrificing weather resistance and mechanical properties.

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.
1. A flooring material containing 1 to 10 parts by weight of cork powder and 1 to 15 parts by weight of polyisobutylene or a copolymer containing isobutylene as a main component.