JP2630367B2 - Ice base material for ice plate formation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-like ice base material for forming an ice skating rink which facilitates the construction of an ice skating rink outdoors.
In addition, on the asphalt pavement surface where the ground temperature tends to rise, on the gravel with good drainage, on the surface with severe unevenness, and further on the slope,
It is for obtaining a frozen layer on an arbitrary surface regardless of the location even on a vertical surface.

[0002]

2. Description of the Related Art Heretofore, this type is as follows. In order to obtain an ice floe outdoors, a frozen ice floe can be obtained by spraying water on a ground where water is cold until the ice freezes, or on a pavement plate, or by placing water in a container. However, especially for ice skating and ice hockey rinks, skaters are strongly demanding the installation of skating rinks from the early winter season, and construction of ice trays by watering is attempted. Some that were only sprinkled due to change, those that were frozen at night, thawed at ambient or ground temperature, and those that were drastic were not flooded. For this reason, a method is employed in which the snowfall is depressed at least until a certain period of snowfall, the waterfall is sprinkled, and the water is used as a water retention material to obtain an ice base. In places where there is no snowfall, there is also a method of laying water retention materials such as shiro, tatami, etc., sprinkling water from above and freezing to obtain an ice base, and after the ice base is made, spraying several mm on this A frozen ice skating rink is completed.

[0003]

However, since sashimi and tatami mats are difficult to obtain recently, and since these water-retaining materials have good water permeability and further retain water as free water, depending on the ground, there is no water on the ground depending on the ground. If the air is sucked out or the outside temperature rises, the dried or frozen water will fall freely, making it useless as an ice base. Also, waiting until the time of snowfall, snow falls for the first time after the season of skating competition in the area where the temperature drops and snow does not fall, even if you make a corner link, it means that you miss the time Will not do. In particular, competitors want to practice on the link as soon as possible, and demand that the link be established early.

Further, in order to make snowfall ice-based,
Especially at night, a large number of people squeeze and sprinkle water, but the surface becomes uneven due to the footprints, and considerable manpower is required to level the surface. Even with all this effort, if the outside temperature rises during the day, it will all melt and drain, and you will have to start over from scratch. In particular, these operations were carried out during the cold nights and were labor intensive. Further, with these conventional methods, it is difficult to perform construction on a gravel with good drainage on a riverbed, in a place with severe unevenness, and further on an inclined surface or a vertical surface.

[0005]

Means for Solving the Problems In order to achieve the above object, the present invention is as follows. That is,
After being immersed in water and sufficiently absorbing water,
Ice cube forming ice having a water retention capacity of 200% or more after centrifugal dehydration at 00G for 5 minutes, a surface lightness index of 60 or more, and a light-shielding rate of the entire sheet of 80% or more. Base material. G represents 9.8 m / s ² in the acceleration of gravity. In order to obtain a predetermined level of lightness index and light-shielding rate, it is preferable to integrate a nonwoven fabric of polyester fiber or the like with the ice base surface. When centrifugal dewatering at 300 G is performed for 5 minutes, the water content of ordinary water or gravity water is less than 200%. Because gravity water has separated due to centrifugal force, freezing these water retention materials with a low moisture content does not freeze because there is no moisture, it becomes an ice base with many voids, and if you spray water on it, it will melt at the water temperature, or Since the ice is not strong, it is easily broken by external force. When centrifugal dewatering at 300 G is performed for 5 minutes, a sheet-like material having a water retention capacity of 200% or more becomes a gel after absorbing water, and is obtained using a highly water-absorbent resin that retains water in a fixed water state.

Examples of the superabsorbent resin include starch / acrylic acid graft polymer, polyacrylate, vinyl acetate / acrylate copolymer, acrylamide / acrylate copolymer, polyethylene oxide, isobutylene / anhydrous. Examples thereof include a maleic acid copolymer, a PVA / maleic anhydride copolymer, a starch / polyacrylonitrile copolymer, an acrylate / acrylamide copolymer, a CMC type, and the like, and include powdery and fibrous ones.

[0007] Since these absorb about 100 to 10,000 times their own weight and retain water as fixed water even after centrifugal dewatering at 300 G for 5 minutes, to achieve a water retention capacity of 200% or more, These may be contained in small amounts as necessary. In order to make these superabsorbent resins into a sheet shape, if they are fibrous, they may be mixed with other fibers and made into a nonwoven fabric or knitted by needle punching or the like. If it is a powder, it can be obtained by sandwiching with a cloth and joining with a needle punch, or packing in a bag.

[0008] In order to lay the sheet material over a wide area,
It must be at least rollable. The sheet-like material of the present invention has a surface lightness index of 60 or more and a sheet light-shielding ratio of 80% or more. The lightness index referred to here is J
Measured according to ISZ8729, and the light-shielding ratio is JISL105
5A method, but measured by illuminance 10,000 lx before mounting the test piece.

The ice base material of the present invention can be used early in the skating season and can be used for rinks until late. During the early and late seasons, the temperature during the day easily rises even if it is frozen at night, and the temperature rises. Water is retained in the state of fixed water so that water does not flow out, and it is frozen in this gel state, but at this time, it absorbs heat rays especially due to sunlight,
It must not increase the temperature of the ice base itself or allow the heat rays of sunlight to penetrate the ice base and raise the ground temperature under the ice base.

[0010] In particular, when a skating rink is installed on an asphalt pavement surface which is a parking lot in summer, the black asphalt surface easily absorbs heat rays and the surface temperature tends to rise. Setting the lightness index of the ice-based material to 60 or more reflects heat rays, prevents the temperature of the ice-based material from rising, and prevents light rays from penetrating when the shading rate is 80% or more, prevents the ground temperature from rising, and keeps the ground surface cool. I do. The ice-based material having a water retention capacity of fixed water, a lightness index, and a light-shielding rate which are out of the range of the ice rink is not different from the skating rink according to the prior art and is not good. In order to obtain predetermined levels of lightness index and light-shielding ratio, it is preferable that a nonwoven fabric of polyester fiber or the like be integrated with the surface of the ice base material.

[0011]

EXAMPLE A 6-denier polyester-cut fiber and a 5-denier superabsorbent fiber were blended and formed into a sheet by needle punching to produce a 150 g / m ² non-woven fabric sheet. A spunbonded nonwoven fabric having a good basis weight of 60 g / m ² was needle-punched to complete an integrated nonwoven fabric. The mixing ratio of the 5 denier superabsorbent fibers at this time was 5% in total. About this composite nonwoven fabric, the lightness index measured on the surface spunbond side is 78, the light-shielding ratio is 90%, this nonwoven fabric is immersed in water for 30 minutes, sufficiently absorbed, centrifugally dehydrated at 300 G for 5 minutes, and centrifuged. When the water content after dehydration was measured, it was found that the water content was 250 to 300% of the absolute dry weight.

Comparative Example 1 A sheet obtained by mixing 6 denier polyester cut fiber and 5 denier superabsorbent fiber was needle-punched to obtain a basis weight of 210%.
A nonwoven sheet adjusted to g / m ² was prepared. At this time, the mixing ratio of the 5 denier superabsorbent fiber was 2%. The lightness index measured on the surface of the nonwoven fabric sheet was 52, and the light blocking ratio was 70%. Immerse this nonwoven fabric in water for 30 minutes,
After sufficient water absorption, centrifugal dehydration at 300 G was performed for 5 minutes, and the water content after centrifugal dehydration was measured.
It retained 0-200% moisture.

(Comparative Example 2) Under the same conditions as in Comparative Example 1, 210
g / m ² nonwoven sheet was made. However, no superabsorbent fiber was used at all, and polyester cut fiber 6 denier was 100%. The polyester cut fiber is slightly different in whiteness from the example as in the comparative example, but the physical properties are not changed due to the difference in the polymerization catalyst. The lightness index measured on the surface of the nonwoven fabric sheet was 50, and the light blocking ratio was 75%. This nonwoven fabric was immersed in water for 30 minutes, and after sufficiently absorbing water, centrifugal dehydration at 300 G was performed for 5 minutes, and the water content after centrifugal dehydration was measured. .

The above three types of non-woven fabrics are laid 400 m ² each in a part of an asphalt-paved parking lot outdoors at a daytime maximum temperature of 5 ° C. and a nighttime minimum temperature of −10 ° C. The nonwoven was hydrated. Since the asphalt pavement is a parking lot, it has a slope of about 5/1000 and excess water is drained to drains. In the daytime, it was left for 3 days in this place where it was almost clear and exposed to sunlight, and after 3 days at night, the freezing status of the three types of nonwoven fabrics was investigated. The outside temperature at this time is -5
° C.

As a result of the investigation, the nonwoven fabric of the example was frozen while completely containing water, stuck to the asphalt pavement surface, and the state of ice was clearer and harder than that of the comparative example and could not be peeled off from the pavement surface. On the other hand, Comparative Examples 1 and 2 had no voids in the non-woven fabric, had many voids, the non-woven fibers floated up white, and the non-woven fabric sheet was easily broken and easily peeled off from the asphalt surface.

In these comparative examples, the temperature rise of the asphalt ground surface due to the heat rays of the sunlight was remarkable with the rise of the daytime temperature, and it is considered that the water frozen at night was melted and flown out. Was determined to be. After that, the nonwoven fabric of the example was further frozen when it was sprinkled on water and then sprinkled, and when this was repeated, a suitable ice plate was formed as a skating rink, and a good ice base was contained therein. In order to prevent the rise, a stable ice floe was obtained without melting out during the day after the next day.

The operation and effects will be described.

[0018]

Since the present invention is configured as described above, the following effects can be obtained. 1. A great deal of labor such as snow compaction and leveling work is not required. 2. The temperature is easy to rise and the ice condition is good from early in the season to late in the season. 3. We do not choose setting place. In other words, it can be installed on gravel with good drainage properties, on places with severe unevenness, and on inclined or vertical surfaces, and links can be installed on asphalt pavement surfaces where the ground temperature tends to rise. 4. Good cold insulation effect and hard ice. 5. Since the ice base contains a sheet-like ice base, it has the effect of reinforcing the ice. 6. Since it is hard to crack, it can withstand ground changes such as earthquakes.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shiro Sasaki 2-2-16-1 Shimomeguro, Meguro-ku, Tokyo Within Textile Engineering and Construction Co., Ltd. (72) Inventor Eiichi Taki 2-2-2 Dojimahama, Kita-ku, Osaka-shi No. 8 Inside Toyo Spinning Co., Ltd. (56) References JP-A-5-309155 (JP, A)

Claims (1)

(57) [Claims] 1. After immersing in water and absorbing water sufficiently, 30
A sheet having a water retention capacity of 200% or more after centrifugal dehydration at 0 G for 5 minutes and a surface lightness index of 60
As described above, the ice base material for forming an ice plate, wherein the light shielding ratio of the entire sheet is 80% or more.