JP2000169730A - Elastic paving material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an elastic paving material comprising an aggregate such as rubber chips and natural stones and to prevent the growth of bacteria, molds and algae even in a hot humid place or a place constantly wet with water without using a plurality of chemicals. SOLUTION: The resin binder of the elastic paving material contains an isothiazoline-based antibacterial, fungicidal and anti-algous chemical. As an aggregate used, a soft, elastic aggregate such as rubber chips or a mixture of a soft, elastic aggregate and a hard aggregate such as natural stones is used to ensure appropriate cushioning.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a park, a golf course,
An elastic pavement material used for public roads, around pools, verandas, etc., which improves aesthetics, cushioning properties, water permeability, etc., and provides walking sensation and safety.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application No. Hei 9-111352, various antibacterial agents, fungicides, and algaecides are added to a resin binder of an elastic pavement made of various rubber chips to remove bacteria, It was known to prevent the development of mold and algae. As a result, bacteria are propagated and become slimy under the replenishment of nutrients such as various kinds of garbage, etc., which are constructed in places where water and water are constantly exposed to high temperatures and humidity, and mold and algae are generated and the appearance is impaired. Was preventing that.

[0003]

However, in such conventional products, agents which act individually such as an antibacterial agent for antibacterial action, a fungicide for fungicide action, and an antialgal agent for antialgal action are used. Therefore, it was necessary to use various drugs in combination to prevent all of them. Some drugs had both antibacterial and antifungal effects, but none of them showed antialgal effects. Therefore, in order to satisfy the three functions of antibacterial, antifungal and antialgal in such an elastic pavement material, there is a problem that a plurality of chemicals must be always used. An object of the present invention is to provide an elastic pavement material that suppresses the generation of bacteria, mold, and algae without using a plurality of drugs.

[0004]

In a soft elastic aggregate alone or an elastic pavement in which the soft elastic aggregate and the hard aggregate are combined with a resin binder, the resin binder has an isothiazoline antibacterial effect and a fungicidal effect. And an elastic pavement material characterized by the addition of a drug exhibiting an antialgal effect.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below in detail. In this embodiment, as the aggregate used, the soft elastic aggregate used was a rubber chip mainly composed of ethylene propylene rubber having a particle size of 1 to 3 mm, and the hard aggregate had a particle size of 1 to 3.
５5 mm natural stones were used. When both the soft elastic aggregate and the hard aggregate were used, they were mixed at a volume ratio of 1: 1. A urethane resin binder is added to a soft elastic aggregate alone or a mixture of a soft elastic aggregate and a hard aggregate,
Stir and mix for minutes. Assuming that the aggregate was 100, the resin binder was mixed at a weight ratio of 7. In addition, the porosity which shows the ratio of the space in an elastic pavement material was set to 25%.

[0006] As an agent having an antibacterial effect, an antifungal effect and an antialgal effect, an isothiazoline-based agent which is a kind of an organic thiazoline compound and having a heat-resistant temperature of 220 ° C or higher was used. In this case, the heat-resistant temperature indicates that no decomposition or volatilization occurs at this temperature. A mixture of the aggregate, the resin binder, and the above-described agent was poured into a mold, and cured at a hot plate temperature of 150 to 160 ° C. for 10 minutes to prepare a test piece of an elastic pavement molded product.

As the soft elastic aggregate, besides ethylene propylene rubber, natural rubber, diene rubber such as styrene-butadiene copolymer rubber, butadiene rubber, chloroprene rubber, butyl rubber, nitrile rubber, urethane rubber,
Acrylic rubber, polysulfide rubber, epichlorohydrin rubber,
Silicone rubber, fluorine rubber, soft vinyl chloride or the like may be used, and the particle size is preferably 1 to 7 mm, more preferably 1 to 5 mm. If it is finer than this, water permeability decreases, and if it is larger than this, elongation as an elastic pavement material becomes small and the whole elastic pavement material becomes too hard, which is not preferable as the pavement material of the present invention. It is preferable to use ethylene propylene rubber as the rubbery component because weather resistance is improved. The hardness of the soft elastic aggregate is 3 in JIS A hardness.
The range of 0 to 90 is preferable, and if it is smaller than this, it is too soft and is not preferable as a pavement material. If it is too hard, it is too hard and a load is imposed on a knee or the like, which is not preferable as a cushioning elastic pavement material.

[0008] As the hard aggregate, natural stone, glass, ABS
・ Polypropylene ・ Polystyrene ・ Polyurethane ・ FR
Hard plastics such as P, polycarbonate, acetal resin, methylpentene resin, etc.
The SA hardness may be 95 degrees or more, and the particle size may be 1
It is preferably up to 8 mm, more preferably 1 to 5 mm. If it is finer than this, the water permeability decreases, and if it is larger than this, the voids become too large and the touch feeling becomes too hard, and the feeling of foreign substances becomes too large, which is not preferable as a cushioning pavement material. As the resin binder to be used, besides urethane resin, epoxy resin, acrylic resin, liquid rubber such as SBR of various natural rubbers and synthetic rubbers, and the like may be used.

[0009] By using the soft elastic aggregate alone or by mixing the soft elastic aggregate with an appropriate hard aggregate, it is possible to secure a good cushioning property without burdening the knee or the like. The volume ratio of the hard aggregate to the soft elastic aggregate may be a volume ratio of up to 3 for the soft elastic aggregate 1. If it exceeds 3, it becomes too hard, which is not preferable.

The weight ratio of the resin binder to be used is preferably about 5 to 12 with respect to the aggregate 100 in the case of press hot plate molding with a mold as shown in the embodiment of the present invention, and is preferably smaller than this. However, the physical properties of the pavement material are too small, and if it is larger than this, the quality is excessive, and the curing time of a moisture-curable urethane-based resin binder is too long, which is not preferable.

In addition, it is also possible to apply a so-called on-site construction method in which the material is poured directly onto a base at the construction site, and is uniformly leveled by appropriate rolling or the like, and is cured relatively slowly at that temperature at that location. In this case, since appropriate fluidity for pouring into the mixed material is required, the amount of the resin binder is preferably set in the range of 10 to 40 with respect to the aggregate 100. If it is smaller than this, the physical properties of the pavement material become too small, and if it is larger than this, the quality becomes excessive, and the moisture-curable urethane-based resin binder may undesirably foam. Further, depending on the situation, in the case of a moisture-curable urethane-based resin binder, a metal catalyst accelerator such as various tins may be added in order to accelerate the curing.
The mixing of the materials may be performed at the site where the work is performed.

In order to improve the adhesiveness of the binder to the aggregate, a pretreatment agent having a good compatibility with the resin binder to be used (a low-viscosity resin binder with which the aggregate is wetted in advance, An amine-based pretreatment agent is preferred for the urethane-based binder.).

Regarding the curing temperature, in the embodiment described in the embodiment of the present invention, a mixture of the aggregate, the resin binder, and the chemical is poured into a mold, and the hot plate temperature is set to 155 to 1.
The composition was cured at 60 ° C. for 10 minutes. The curing temperature of such an elastic pavement material is 130 to 140 ° C. as shown in a patent (title of the invention, elastic pavement material) filed on June 25, 1998 by Aichi Tire Industry Co., Ltd. From
As shown in Japanese Patent Application No. 9-111352, 155
160 ° C. is known. Japanese Patent Application No. 9-11135
As shown in No. 2, antibacterial and antifungal agents mainly composed of zinc pyrithione and organic antialgal agents mainly composed of organic nitrogen urea are yellow when cured at about 160 ° C for a long curing time. Although it changes, the isothiazoline-based drug of the present invention has an heat-resistant temperature of 220 ° C. despite being organic.
As described above, yellowing does not occur and the productivity is excellent.

By using color chips as an aggregate or mixing various pigments, it is possible to pave in various colors and to improve the appearance of the pavement surface. If color chips are used only in the upper layer and chips such as various kinds of waste tires are used in the lower layer, resources can be recycled.

Next, the results of the antibacterial, antifungal and antialgal tests of the various elastic pavement materials thus manufactured will be described. As the test piece, the isothiazoline-based drug of the present invention was added to the resin binder in an amount of 0.5% by weight, 0.75% by weight, and 1.0% by weight.
0%, 1.5% and 2.0% by weight were added. Further, as a comparative piece, an organic zinc pyrithione was also added at 0.5% by weight, 0.75% by weight, 1.0% by weight, 1.5% by weight and 1.5% by weight.
% And 2.0% by weight, and 1.0% by weight and 5.0% by weight of an inorganic (silver type, ie, a type that releases silver ions) drug. Then, a blank containing no drug was prepared.

As described above, two kinds of aggregates are used: a single case of soft elastic aggregate (single rubber chip) and a case of using a mixture of soft elastic aggregate (rubber chip) and hard aggregate (natural stone). .

In the antibacterial test, about 15 ml of an agar medium for bacteria is dispensed into a sterilized petri dish. After solidification, about 5 ml of an agar medium containing bacterial liquids of Escherichia coli and staphylococci are overlaid. Attach the elastic pavement sample to the center of the culture medium, cover and incubate the bacteria at 37 ° C for 24 hours.
After culturing for an hour, the presence or absence of antibacterial efficacy was observed. If there is a halo width of 2 mm or more (width where no bacteria were cultured) along the periphery of the elastic pavement material of the sample, it is determined to be effective.

The mildew test is a mold resistance test JIS-Z-2911
It went according to. The test bacteria include Aspergillus niger and Penn, which are synthetic resin molds for mold resistance test of JIS Z-2911.
icillium citrinum, Cladosporium cladosporioides, C
Four types of haetomium globosum were mixed and used. In the test method, about 20 ml of a plain agar medium (a medium in which only agar powder is dissolved and used for retaining moisture in the Petri dish) is dispensed into a sterilized Petri dish, and after solidification, an elastic pavement material sample is attached. One drop of the fungal agar medium containing the mixed test mold spore suspension is dropped on the sample, and cultured at 28 ° C. for 7 days, and the presence or absence of mold growth on the sample is observed. Judgment was made based on the degree of mold generation on the test piece, and judged as follows. (---) ······························································································· When mold grows on top of drip agar (+): Mold growth within 1 mm of the contact point on the sample (++): Mold growth up to about 2 mm from the contact point on the sample In case of growth (+++) ・ ・ In case of growth of mold more than 2mm from contact point on sample

For the alga prevention test, the test piece was previously heated to 80 ° C.
Was immersed in hot water for 7 days to perform a so-called drug abuse treatment, and then subjected to an algal control test. This was done to further clarify the existence of the anti-algal effect because the growth of the algae was rather slow. In the anti-algal test, the test piece was placed in a sterilized plant box, and inorganic salt agar was poured into the sterilized plant box until the top 2-3 mm of the test piece was left. After solidification, algae suspension (test bacteria; Chlorella vulgaris, Hormidium sp., Anaba
ena sp.) was poured over the entire surface to the extent that the drug-treated surface was completely buried, and cultured in a positive temperature incubator for 28 days. Judgment was made based on the halo width (width where no algae were cultured) along the periphery of the elastic pavement material of the sample. Antibacterial effect of various drugs when using soft elastic aggregate alone (rubber chip alone) as aggregate
The results of the fungicide test are shown in Table 1, and the results of the algal control test are shown in Table 2. The antibacterial properties in Table 1 show the results for Escherichia coli and staphylococci, respectively. The fungicidal properties are shown as the results for the whole test bacterium, and the antialgal properties in Table 2 show Chlorella vulgaris and Hormid.
The results for ium sp. and Anabaena sp. are shown respectively.

[0020]

[Table 1]

[0021]

[Table 2]

Table 3 shows the antibacterial and antifungal test results of various chemicals when a mixture of soft elastic aggregate (rubber chips) and hard aggregate (natural stone) was used as the aggregate, and Table 4 shows the algal resistance test results.
It was shown to. The antibacterial properties in Table 3 show the results for Escherichia coli and staphylococci, respectively, the fungicidal properties are shown as the results for the whole test bacterium, and the antialgal properties in Table 4 show the results for Chlorella vulgaris and Ho.
The results for rmidium sp. and Anabaena sp. are shown respectively.

[0023]

[Table 3]

[0024]

[Table 4]

From Tables 1, 2, 3, and 4, it can be seen that the isothiazoline-based drug of the present invention is effective in all of antibacterial, antifungal and antialgal properties. The amount of addition is about 0.5 to 1.5% by weight, particularly preferably 0.5 to 1% by weight, based on the resin binder. If the amount is less than 0.5% by weight, the effect may become unstable if dispersion is too small. It can be seen that zinc pyrithione drugs show an effect on antibacterial properties and antifungal properties, but have no effect on algal properties. It can be seen that the inorganic drugs have no or little effect on the antibacterial, antifungal and algal properties. This is presumably because the inorganic drug exerts its effect by releasing silver ions, and probably reacts with the sulfur of the vulcanizing agent in the rubber as silver sulfide and is fixed.
In addition, it can be seen that the isothiazoline-based agent of the present invention has an antibacterial effect, a fungicidal effect and an anti-algal effect on soft elastic aggregate alone or on a mixture of soft elastic aggregate and hard aggregate.

The present invention is not limited to such an embodiment at all, and can be implemented in various modes without departing from the gist of the present invention.

[0027]

As described above in detail, the elastic pavement material of the present invention can exhibit an antibacterial effect, a fungicidal effect and an anti-algal effect only with an isothiazoline-based agent without using a plurality of agents. And the number of man-hours for adding a drug during production can be reduced.
In addition, whether the aggregate used is soft elastic aggregate alone or a mixture of soft elastic aggregate and hard aggregate, it must be compatible with various types of construction such as cushioning to exhibit antibacterial effect, antifungal effect and antialgal effect. Can be.

Continued on the front page F-term (reference) 4J002 AC01Y AC03W AC07W AC08W AC08Y AC09W BB03X BB12X BB15W BB17X BB18W BD05W BD12W BG03Y BG04W BN15X CB00Y CD00Y CG00X CH04W CK00X CK02W CK02W CK02W CK02W CK02W CK02X

Claims (1)

[Claims] 1. An elastic pavement comprising a soft elastic aggregate alone or an elastic pavement in which the soft elastic aggregate and a hard aggregate are combined with a resin binder, wherein the resin binder has an isothiazoline antibacterial effect, a fungicidal effect and an antialgal effect. An elastic pavement material characterized by adding an agent showing the following.