JPH0452301A - Manufacturing of elastic paving block - Google Patents

Abstract

PURPOSE:To improve touch of barefoot walking and simplify routine maintenance by integrating a base material layer, in which vlucanized rubber chips are joined with a synthetic resin binder, and the surface layer of a vulcanized rubber sponge chip, and providing irregularities on the upper surface of the surface layer. CONSTITUTION:Irregularities 6 are arranged on the upper surface of a vulcanized rubber sponge chip surface layer 3 with an elastic paving block 1 integrated by laminating a base material layer 2 and the vulcanized rubber sponge chip surface layer 3. In this case, an elastic layer is formed on the base material layer 2 by mutually joining vulcanized rubber chips 4, having grain diameters of about 0.5mm-10mm, with a synthetic resin binder of urethane resin, etc., formed on a proportion of 5-30 pts.wt. to 100 pts.wt. of vulcanized rubber chips. Meantime, the surface layer 3 is formed by mixing 100 pts.wt. of vulcanized rubber sponge chips, made by grinding vulcanized rubber sponges having three or less times expansion ratio and having a grain diameter of 0.5-30 pts.wt. of prepolymer such as urethane prepolymer, etc. The total area of the protruded zenith parts of the irregularities is made 15-60% of the area of the upper surface of the surface layer 3.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is applicable to poolside, where people often walk barefoot.
The present invention relates to an elastic paving block suitable as a paving material for floors of balconies, balconies, etc.

(Conventional technology) Conventionally, paving materials used for poolsides, balconies, balconies, etc. where people often walk barefoot include:
There are inorganic paving materials such as concrete, resin mortar, and tiles. Additionally, there is also an @-based elastic paving material that is softer than the above-mentioned paving materials and has safety considerations in mind. Organic elastic paving materials include non-water permeable elastic paving materials made by applying polyurethane resin with a trowel, etc., and a mixture of rubber chips made from crushed tires and a synthetic resin binder such as urethane resin, spread over a base and leveled. , elastic paving material with a top coat finish of acrylic urethane resin, etc., and elastic paving blocks manufactured in a factory with an elastic layer made of rubber chips made from crushed tires, etc., bound with a synthetic resin binder such as urethane resin colored by adding pigments. etc.

(Problem to be solved by the invention) When outdoor paving materials such as poolsides, balconies, and balconies receive solar radiation, their surface temperature rises. growing.

Inorganic paving materials such as concrete, resin mortar, and tiles have surface temperatures of 50 to 60° C. during intense summer sunlight, making it extremely difficult to walk barefoot.

Therefore, water is sprinkled at least twice a day, once in the morning and once in the afternoon, to make it possible to walk around the poolside barefoot. The above-mentioned paving material becomes slippery when it becomes wet due to water spraying, etc., and since the material is hard, there is a problem in that injuries are more likely to occur in the event of a fall.

On the other hand, a non-water permeable elastic paving material made by applying polyurethane resin with a trowel, etc., a mixture of rubber chips made from crushed tires and a synthetic resin binder such as urethane resin is spread evenly on the base, and then topped with acrylic urethane resin, etc. Organic-based elastic paving materials, such as coat-finished elastic paving materials and factory-manufactured elastic paving blocks made of elastic layers made of rubber chips made from crushed tires and bound with a synthetic resin binder such as urethane resin colored with pigments, are inorganic. Compared to other paving materials, it is softer, less slippery even in wet conditions, and is superior in terms of safety. However, the organic elastic paving material
In general, the thermal conductivity is low, so the surface temperature rises quickly due to sunlight, and in the summer, the color is dark or dark blue, brown, etc.
In the case of greens, etc., the surface temperature can reach 60 to 70°C, and the time it takes for walking to become difficult is even longer than with inorganic paving materials. Watering is carried out in the same way as paving materials, but
The water retention capacity of the material itself used for elastic paving materials is extremely low, and elastic paving materials made by bonding rubber chips with a binder have minute voids between the rubber chips, but the water penetration rate is slow and short. It is difficult to retain enough water in the elastic layer with timed watering, and the surface temperature rises quickly after watering, requiring more watering than inorganic paving materials, which requires daily maintenance and management. The disadvantage is that it takes a lot of time and effort.

In consideration of the above facts, the present invention suppresses the surface temperature in summer to a lower level than conventional elastic paving materials or elastic paving blocks, maintains the barefoot walking time for a longer period of time, and reduces the frequency of watering at the poolside. It is an object of the present invention to provide an elastic paving block that can reduce the amount of effort required for daily maintenance and management.

(Problem N to be solved by the invention) In order to achieve the above object, the present invention has a particle size of 0.5+n~
A base material layer consisting of 10■■ vulcanized rubber chips bonded with a synthetic resin binder made of one or two of urethane resin and liquid polybutadiene rubber, and a particle size with an expansion ratio of 3 times or less and an open cell structure. 0.5#III~lO+wa
and a vulcanized rubber sponge chip surface layer made by bonding vulcanized rubber sponge chips with a synthetic resin binder made of one or two of urethane resin and liquid polybutadiene rubber, and the upper surface of the vulcanized rubber sponge chip surface layer. A large number of projections and depressions are arranged on the surface, and the total area of the zenith portion of the projections and projections of the projections and depressions is 15 to 60% of the upper surface area of the vulcanized rubber sponge chip surface layer.
%.

(Function) Since the elastic paving block of the present invention has irregularities formed on the upper surface, the surface area of the upper surface is increased, the heat dissipation effect is increased, and the degree of increase in surface temperature is reduced.

In addition, the unevenness reduces the area of contact with the sole of the foot during walking, allowing the sole to feel a temperature lower than the surface temperature of the upper surface as a sensible temperature. A surface layer of vulcanized rubber sponge chips made of vulcanized rubber sponge chips with an open cell structure bound with a relatively flexible synthetic resin binder of urethane resin and liquid polybutadiene rubber is provided on the upper part of the elastic paving block. This makes the sole of the foot feel soft when walking barefoot despite the unevenness formed on the upper surface. In addition, when watering is performed such as at the poolside, the air bubbles of the vulcanized rubber sponge chip with an open cell structure retain a large amount of water, and the gaps between the vulcanized rubber sponge chips on the surface layer of the vulcanized rubber sponge chip Water retention is promoted in the fine voids between the vulcanized rubber chips in the base material layer that are directly connected to the surface layer of the vulcanized rubber sponge chips, increasing the water retention capacity of the elastic paving block. . After the watering is stopped, the water contained in the microscopic gaps between the vulcanized rubber sponge chips, the microscopic voids between the vulcanized rubber chips, and the air bubbles in the vulcanized rubber sponge chips gradually evaporates and evaporates. The heat of vaporization of perilla suppresses the rise in surface temperature. Since the elastic paving blocks according to the present invention have a large water retention capacity, the barefoot walkable time can be maintained for a long time, and the frequency of watering can be reduced.

In addition, even if the vulcanized rubber sponge chip is in a wet state due to water spraying, etc., numerous air bubbles of the vulcanized rubber sponge chip are exposed on the upper surface of the vulcanized rubber sponge chip surface layer, and the synergistic effect of the unevenness provided on the surface The effect makes it extremely slippery.

(composition) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a perspective view of an example of the elastic paving block of the present invention, and FIG. 2 is a partial sectional view of the same.

In the elastic pavement block 1, a base material layer 2 and a vulcanized rubber sponge chip surface layer 3 are laminated and integrated, and unevenness 6 is provided on the upper surface of the vulcanized rubber sponge chip surface layer 3.

The shape of the upper surface of the elastic paving block 1 is square, but it may be rectangular, polygonal, or interlocking as shown in FIG. 3, and can have various shapes.

The base material layer 2 is an elastic layer formed by bonding vulcanized rubber chips 4 with a particle size of 0.5 mm to 10 mm with a synthetic resin binder 7, and fine voids are formed between the vulcanized rubber chips 4. It is formed. A synthetic resin binder made of one or both of urethane resin and liquid polybutadiene rubber is bonded at a ratio of 5 to 30 parts by weight to 100 parts by weight of the vulcanized rubber chips. As the urethane resin, -at of liquid polybutadiene rubber, or a synthetic resin binder consisting of two types, a urethane prepolymer or a polybutadiene prepolymer having an isocyanate group at the end is used alone or in a mixture of two types. Either a one-component type curing agent that cures with moisture or a two-component type curing agent that cures in combination with a curing agent such as a polyol or polyamine can be used.Pigments are added to a synthetic resin binder to create the desired effect. The base material layer 2 can also be colored in this color.

Vulcanized rubber sponge chip surface layer 3 and particle size 0.51 mm ~
Between the vulcanized rubber sponge chips 5 of 10III+ is an elastic layer bonded with a synthetic resin binder, and minute voids are formed between the vulcanized rubber sponge chips 5. A synthetic resin binder made of one or both of urethane resin and liquid polybutadiene rubber is bonded at a ratio of 5 to 30 parts by weight to 100 parts by weight of the vulcanized rubber sponge chip. As a synthetic resin binder consisting of one or both of urethane resin and liquid polybutadiene rubber, urethane prepolymers or polybutadiene prepolymers having isocyanate groups at the ends are used alone or in combination. Either a one-component type curing agent that is cured by moisture or a two-component type curing agent that is cured in combination with a curing agent such as a polyol or polyamine can be used. Anti-aging agents, ultraviolet absorbers, etc. may be added to the synthetic resin binder, and pigments may also be added to make the vulcanized rubber sponge chip surface layer 3 colored in a desired color.

It is preferable that the vulcanized rubber sponge chip 5 has an expansion ratio of 3 times or less and has an open cell structure in which the cells communicate with each other and the foam as a whole has air permeability or water permeability. The vulcanized rubber sponge chip 5 is made of EPDM in this embodiment.
By mixing rubber with softeners, vulcanizing agents, pigments, and other compounding agents,
A foaming agent was mixed with this compounded rubber, and an EPDM vulcanized rubber sponge having an open cell structure and a foaming ratio of 2 to 3 times was prepared by a normal pressure heating foam vulcanization method, and this was crushed to have a particle size of 0. 5 to 10101 chips. In addition to the EPDM vulcanized rubber sponge, we also use natural rubber, BR, and CR.

Chips obtained by crushing a vulcanized rubber sponge having an open cell structure such as SBR can be used. Alternatively, the air bubbles of a vulcanized rubber sponge chip with a closed cell structure with an expansion ratio of 3 times or less can be mechanically ruptured by passing it through a roll machine, etc., and used as a vulcanized rubber sponge chip with an open cell structure. . Highly foamed vulcanized rubber sponge chips obtained by crushing a highly foamed vulcanized rubber sponge with an open cell structure and a blowing agent ratio of 4 times or more are effective in providing water retention to the elastic paving block 1; Since the vulcanized rubber sponge chips are very soft and easily deformed, the convex portions 6a of the unevenness 6 on the top surface of the elastic paving block 1 are greatly deformed when walking barefoot, and the contact area with the sole of the foot when walking barefoot. This is not preferable because it becomes difficult to reduce.

The lamination and integration of the base material layer 2 and the vulcanized rubber sponge chip surface layer 3 is carried out by placing the vulcanized rubber sponge chip surface layer 3 into a mold that has been processed to form desired unevenness 6 on the upper surface of the vulcanized rubber sponge chip surface layer 3. This is achieved by filling a mixture of vulcanized rubber sponge chips 5 and a synthetic resin binder, which will become the base material layer 2, and a mixture of vulcanized rubber chips 4 and a synthetic resin binder, which will become the base material layer 2, on top of the mixture, and molding them simultaneously.

The large number of unevenness 6 arranged on the upper surface of the elastic paving block 1 is
It is formed by providing a large number of protrusion groups or a large number of grooves on the upper surface of the vulcanized rubber sponge chip surface layer 3. The planar shape of the convex portion 6a of the unevenness 6 can be selected from various shapes such as rectangular, square, elliptical, circular, rhombic, and waveform, taking into consideration the design.

The convex portion 6a is formed in a single step shape with a height of approximately 1 to 6III1, but may be formed in a two step shape as shown in FIG. The convex portions 6a are distributed and arranged on the upper surface of the elastic paving block 1. The smaller the ratio of the total area of the zenith part of the convex part 6a to the area of the upper surface of the elastic pavement block l, the smaller the contact area with the sole of the foot (and the more effective it is to make the sensible temperature of the sole of the foot feel lower). However, considering the walking feeling when walking barefoot, the total area of the zenith portion of the convex portion 6a is 15% to 60% of the upper surface area of the vulcanized rubber sponge chip surface layer.
% is preferable.

(Example) The total area of the zenith of the convex portion is 50% of the area of the upper surface of the vulcanized rubber sponge chip surface layer, and the unevenness having the convex portion having a rectangular planar shape is formed on the upper surface of the vulcanized rubber sponge chip surface layer. A brown EPDM vulcanized rubber with a blowing agent magnification of 2 to 3 times and an open cell structure with a particle size of 0.5 to 10 cm was placed in a mold whose bottom surface was processed to form a vulcanized rubber sponge chip. A mixture of 100 parts by weight of sponge chips and 10 parts by weight of one-component urethane prepolymer, and a particle size of 0.5 to 10+ obtained by crushing a tire to serve as a base layer on top of the mixture
A mixture of 100 parts by weight of a one-component polyptadiene prepolymer was added to 100 parts by weight of a vulcanized rubber chip of +m, and heat compression molded at 150°C for 25 minutes, resulting in a brown upper surface and unevenness on the upper surface. Some elastic paving blocks were obtained. The thickness of this elastic pavement block was 30Il111, and the thickness of the vulcanized rubber sponge chip surface layer was 10mm.

These elastic paving blocks were placed on an outdoor concrete floor, and the feel of the blocks when walking barefoot was examined at different surface temperatures. The results are shown in Table 1. We also measured the surface temperature during the day and after watering. The results are shown in Table 2.

(Comparative example) Particle size 0 obtained by crushing tires into a mold with a flat bottom
．． A mixture of 100 parts by weight of 5-10 mm vulcanized rubber chips, 10 parts by weight of one-component urethane prepolymer, and 4 parts by weight of Bengara was added, and heat compression molded at 150°C for 25 minutes to change the color of the top surface. A brown and flat elastic paving block was obtained. In addition, the thickness of this elastic paving block is 30III
It is Il.

These elastic paving blocks were placed on an outdoor concrete floor, and the feel of the blocks when walking barefoot was examined at different surface temperatures. The results are shown in Table 1. We also measured the surface temperature during the day and after watering. The results are shown in Table 2.

As is clear from the results in Table 1, it was possible to walk barefoot on the elastic paving block of the comparative example up to a surface temperature of about 45°C, but with the elastic paving block of the example, the surface temperature was 55°C.
It was possible to walk barefoot down to about 0°C. It can be seen that this effect is due to the unevenness formed on the upper surface to reduce the area of contact with the sole of the foot during walking.

As is clear from the results in Table 2, the surface temperature of the elastic paving blocks of the example showed a lower rise than that of the comparative example, and the surface area of the upper surface was increased by forming irregularities on the upper surface. The effect of Furthermore, it can be seen that the increase in surface temperature of the elastic pavement blocks of the example after watering is low, and that the surface temperature can be maintained at a level that allows barefoot walking by watering once a day.

Table 1 (Effects of the Invention) As explained above, the elastic paving block of the present invention can reduce the degree of increase in surface temperature due to solar radiation, and can maintain a temperature lower than the surface temperature as a sensible temperature. Since you can feel the back of the block, you can walk barefoot for a longer time on parconi balconies and poolsides, where people often walk barefoot, compared to conventional elastic paving blocks. In addition, since there is no need to spray water frequently to maintain a walkable surface temperature at the poolside, it is possible to reduce the effort required for daily maintenance of watering, and it also improves the feeling of walking. It has excellent properties as a paving material for barefoot walking, such as being smooth, hard to slip, and safe in the event of a fall.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of the elastic paving block of the present invention, Fig. 2 is a partial sectional view showing an example of the elastic paving block of the present invention, and Fig. 3 is another example of the elastic paving block of the present invention. FIG. 4 is a schematic cross-sectional view showing another example of the convex portion of the unevenness according to an example of the elastic pavement pro of the present invention. 1...Elastic pavement block 2...Base material layer 3...Vulcanized rubber sponge chip surface layer 4...Vulcanized rubber chip 5...Vulcanized rubber sponge chip 6...Irregularities 6a...Convex Part 6b... Concavity Figure 1 Figure 2 Figure 3 Procedural amendment August 6, 1990

Claims (1)

[Claims] 1. A synthetic resin made of one or two of urethane resin and liquid polybutadiene rubber, in which vulcanized rubber chips with a particle size of 0.5 mm to 10 mm are mixed at a ratio of 5 to 30 parts by weight per 100 parts by weight of the vulcanized rubber chips. Particle size 0.5 mm obtained by crushing a base material layer bonded with a binder and a vulcanized rubber sponge with an expansion ratio of 3 times or less and an open cell structure.
~100 parts by weight of 10 mm vulcanized rubber sponge chips,
A mixture of 5 to 30 parts by weight of one or two of urethane prepolymers and polybutadiene prepolymers is used as a synthetic resin binder consisting of one or two of urethane resin and liquid polybutadiene rubber on the base layer. The vulcanized rubber sponge chip surface layer is formed by laminating and molding the vulcanized rubber sponge chips together with the synthetic resin binder, and a large number of irregularities are arranged on the upper surface of the vulcanized rubber sponge chip surface layer. A method for producing an elastic paving block, characterized in that the total area of the crests of the convex portions of the unevenness is 15 to 60% of the upper surface area of the vulcanized rubber sponge chip surface layer.