JP2013153673A - Sheet for preventing scattering of radioactive substance while preventing weed, and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet for preventing scattering of radioactive substances while preventing weeds, having both a weed-prevention effect for controlling the growth of weeds and the effect of preventing scattering of radioactive substances since the sheet for preventing scattering of radioactive substances while preventing weeds has a zeolite-containing coating layer formed on the surface of a weed-prevention sheet having a light-blocking effect and water-permeability; wherein by covering the surface of contaminated excavation embankment temporarily left in a construction site where radioactive substances fell, or the surface of fields, roads and the like with the sheet for preventing scattering of radioactive substances while preventing weeds, photosynthesis is prevented by using the high light-blocking effect of the weed-prevention sheet to control the growth of weeds, while also a soil environment can be maintained because of water permeability, and the radioactive substances can be adsorbed and held to the sheet for preventing scattering of radioactive substances while preventing weeds by the adsorption action of the zeolite in the coating layer.SOLUTION: A coating layer 2 containing zeolite Z is formed on the surface of a light-blocking and water-permeable weed-prevention sheet 1.

Description

  The present invention relates to a weedproof and radioactive material scattering prevention sheet having a herbicidal effect for preventing the generation of weeds and the like, and a scattering prevention effect for radioactive substances falling on the surface of soil such as roads and fields, and a method for producing the same.

  2. Description of the Related Art Conventionally, as this type of herbicidal sheet, a sheet made of a non-woven fabric of polylactic acid fibers having light shielding properties and water permeability is known.

Japanese Patent No. 3573612

  However, even if the surface of the temporary contaminated excavation embankment, fields, roads, etc. where the radioactive materials released due to the recent nuclear accident have fallen are covered with weeding sheets, weed control prevents weeds from growing Although the effect is exhibited, there is a disadvantage in that it is sometimes impossible to prevent the radioactive material from being scattered around by causing the weeding sheet to be lifted by a strong wind.

  The present invention aims to solve these disadvantages. Among the present inventions, the invention according to claim 1 is a coating layer containing zeolite on the surface of a herbicidal sheet having light shielding properties and water permeability. It is in the sheet | seat for radioactive material scattering prevention sheet | seats combined with grass prevention characterized by forming.

  The invention described in claim 2 is characterized in that the weedproof sheet is made of biodegradable polylactic acid fiber, and the invention described in claim 3 is characterized in that the weedproof sheet is woven. It is characterized by being a cloth.

  Further, the invention of the method according to claim 4 immerses a herbicidal sheet having light-shielding properties and water permeability in an emulsion obtained by suspending zeolite in a binder resin, and the surface of the herbicidal sheet is obtained by the immersion. The present invention resides in a method for producing a sheet for preventing scattering of radioactive material for grass protection, characterized in that a coating layer containing zeolite is formed.

  The invention of the method according to claim 5 is characterized in that the herbicidal sheet is composed of biodegradable polylactic acid fiber, and the method invention of claim 6 is characterized in that the zeolite is Is characterized by comprising substantially spherical fine-grained zeolite mineral, and the method invention according to claim 7 is characterized in that the binder resin is a silicon-modified acrylic resin emulsion. is there.

  As described above, the present invention is the invention according to claim 1 for preventing scattering of radioactive material for use as a herbicide, wherein a coating layer containing zeolite is formed on the surface of a herbicidal sheet having light shielding properties and water permeability. Since it is a sheet, it is possible to obtain a sheet for preventing herbicide and radioactive material scattering that has both the herbicidal effect to suppress the growth of weeds and the effect of preventing the scattering of radioactive material. Covering the surface of soil, such as temporarily contaminated excavated embankments, fields, roads, etc., where the material has fallen, prevents the photosynthesis due to the high light-shielding properties of the herbicidal sheet, and suppresses weed growth and water permeability The soil environment can be preserved by its properties, and the radioactive material can be adsorbed and retained on the sheet for preventing herbicide and radioactive material from being scattered by the adsorption action of the zeolite in the coating layer. , It is possible to prevent the periphery spread of radioactive substances present on the surface or in rainwater soil.

  In the invention according to claim 2 or 5, since the herbicidal sheet is composed of polylactic acid fiber having biodegradability, after a certain time has elapsed, the herbicidal sheet is almost completely decomposed by biodegradation. It is possible to save time and effort for disposing of the sheet and to prevent contamination of the natural environment. In the invention of claim 3, since the weedproof sheet is a woven fabric, it has high rigidity and tensile strength. The mechanical strength can be obtained, and the durability of use can be enhanced.

  In the invention according to claim 4, a herbicidal sheet having light shielding properties and water permeability is immersed in an emulsion obtained by suspending zeolite in a binder resin, and the surface of the herbicidal sheet is obtained by this immersion. A sheet for preventing the scattering of radioactive material with a herbicide is produced by forming a coating layer containing zeolite on the sheet, so that the sheet for preventing the scattering of radioactive material with a herbicide can be easily produced and the production cost can be reduced. Can be reduced.

  Further, in the invention described in claim 6, since the zeolite is composed of a substantially spherical fine-grained zeolitic mineral, the adsorbing action of the radioactive substance can be exhibited satisfactorily. In this case, since the binder resin is a silicone-modified acrylic resin emulsion, the adhesion strength between the herbicidal sheet and the coating layer and the retention strength of zeolite in the coating layer can be increased. The durability of the sheet can be increased.

It is a use state figure of the example of an embodiment of the invention. It is a fragmentary sectional view of the example of an embodiment of the invention. It is manufacturing process explanatory drawing of the embodiment of this invention.

  FIG. 1, FIG. 2 and FIG. 3 show embodiments of the present invention. Reference numeral 1 denotes a herbicidal sheet, which is a polylactic acid fiber having excellent light shielding properties, water permeability, weather resistance against ultraviolet rays, and biodegradability. Made of twill fabric. This polylactic acid fiber is a bioplastic synthesized from plant-derived materials, also known as corn fiber, for example, and polymerizes lactic acid produced by lactic acid fermentation by lactic acid bacteria using corn, potato and sugarcane as raw materials Polylactic acid is made into fiber, and it is not a material derived from chemical raw materials such as petroleum, so it can be used as a nutrient source for microorganisms in the soil and water even after disposal after use. It can be said that the fiber is decomposed into carbon dioxide and is kind to the earth.

  Reference numeral 2 denotes a coating layer. In this case, the herbicidal sheet 1 is immersed in an emulsion L in which the zeolite Z is suspended in the liquid binder resin B, and the surface of the herbicidal sheet 1 is immersed by this immersion. The coating layer 2 containing Z is formed, and the grass protection and radioactive material scattering prevention sheet 3 is manufactured. This zeolite Z, also called zeolite, has a skeletal structure composed of aluminosilicate minerals and has a molecular-level micropore in the skeleton. The size of this micropore is close to the size of a cesium atom. It is said that it is easy to adsorb.

  In this case, the trade name “MAHOSOL F.300K” (manufactured by Matsumoto Yushi Seiyaku Co., Ltd.) is used as the emulsion L in which the zeolite Z is suspended in the binder resin B, and the general appearance of this product is milky white in appearance. Emulsion, ionicity is anionic, active ingredient is 30%, neutral pH, zeolite Z is made of zeolitic mineral in the form of spherical particles, and binder resin B is made of silicon-modified acrylic resin emulsion. .

  In this embodiment, the coating layer 2 containing zeolite Z is formed on the surface of the herbicidal sheet 1 having light-shielding properties and water permeability, and thereby the herbicidal effect and the radioactive substance H of the weeds are suppressed. A sheet 3 for preventing the scattering of radioactive material, which also has a scattering prevention effect, can be obtained, and as shown in FIG. 1, the temporary contamination at the construction site where the radioactive substance H has fallen by the sheet 3 for preventing the scattering of radioactive material as shown in FIG. By covering the surface of soil D such as excavated embankment, fields, roads, etc., photosynthesis is inhibited by the high light-shielding property of the weed-proof sheet 1, and weed growth can be suppressed, and the soil environment can be preserved by water permeability. As shown in FIG. 2, the radioactive substance H, for example, cesium 137 having strong radioactivity, is adsorbed in the fine pores of the zeolite Z by the adsorption action of the zeolite Z in the coating layer 2. The radioactive substance H can be adsorbed and held on the sheet 3 for preventing the scattering of radioactive substance used as a herbicide, and the radioactive substance H adsorbed by the zeolite Z can absorb the radioactive substance H present on the surface of the soil D or in the rainwater. Around scattering can be prevented.

  In this case, the herbicidal sheet 1 is made of polylactic acid fiber having biodegradability, so that after a certain period of time, it is almost completely decomposed by biodegradation, so that it is possible to save time and effort for disposal of the herbicidal sheet. Environmental pollution can be prevented, and in this case, since the above-mentioned herbicidal sheet 1 is a woven fabric, mechanical strength such as high rigidity and tensile strength can be obtained, and durability of use can be enhanced. it can.

  In this case, as shown in FIG. 3, the herbicidal sheet 1 having light-shielding properties and water permeability is immersed in an emulsion L in which the zeolite Z is suspended in the binder resin B. Since the coating layer 2 containing the zeolite Z is formed on the surface and the sheet 3 for preventing herbicide and radioactive material scattering is manufactured, the sheet 3 for preventing herbicide and radioactive material scattering can be easily manufactured. Manufacturing cost can be reduced.

  In this case, since the zeolite is composed of a substantially spherical fine particulate zeolite mineral, the adsorption action of the radioactive substance H can be satisfactorily exhibited. In this case, the binder resin B is a silicon-modified acrylic resin emulsion. Therefore, it is possible to increase the adhesion strength between the herbicidal sheet 1 and the coating layer 2 and the holding strength of the zeolite Z in the coating layer 2, and to improve the durability of the sheet 3 for preventing the scattering of radioactive material used as a herbicide. .

  In addition, this invention is not restricted to the said embodiment, The raw material, a composition, a kind, etc. of the herbicidal sheet 1, the coating layer 2, the zeolite Z, the binder resin B, and the emulsion L are changed suitably, and is designed. It is what is done.

  As described above, the intended purpose can be sufficiently achieved.

H Radioactive substance D Soil L Emulsion B Binder resin Z Zeolite 1 Herbicidal sheet 2 Coating layer 3 Sheet for preventing scattering of radioactive substance used as herbicide

Claims (7)

  A herbicidal and radioactive material scattering preventing sheet characterized by forming a coating layer containing zeolite on the surface of a herbicidal sheet having light shielding properties and water permeability.   The said grass prevention sheet | seat consists of a polylactic acid fiber which has biodegradability, The sheet | seat for grass prevention combined use radioactive substance scattering prevention of Claim 1 characterized by the above-mentioned.   The sheet for preventing scattering of a radioactive material for grass protection according to claim 2, wherein the weedproof sheet is a woven fabric.   It is characterized in that a herbicidal sheet having light shielding properties and water permeability is immersed in an emulsion obtained by suspending zeolite in a binder resin, and a coating layer containing zeolite is formed on the surface of the herbicidal sheet by the immersion. The manufacturing method of the sheet | seat for radioactive material scattering prevention used as herbicide.   5. The method for producing a sheet for preventing scattering of radioactive material for grass protection according to claim 4, wherein the herbicidal sheet comprises polylactic acid fiber having biodegradability.   6. The method for producing a sheet for preventing herbicidal and radioactive material scattering according to claim 4 or 5, wherein the zeolite comprises a substantially spherical fine particulate zeolitic mineral.   The said binder resin is a silicone modified acrylic resin emulsion, The manufacturing method of the sheet | seat for anti-weeding and radioactive material scattering prevention of any one of Claims 4-6 characterized by the above-mentioned.