WO2021241707A1 - 中性子線遮蔽石膏系建築用ボード、中性子線遮蔽石膏系建築用ボードの製造方法 - Google Patents

中性子線遮蔽石膏系建築用ボード、中性子線遮蔽石膏系建築用ボードの製造方法 Download PDF

Info

Publication number
WO2021241707A1
WO2021241707A1 PCT/JP2021/020274 JP2021020274W WO2021241707A1 WO 2021241707 A1 WO2021241707 A1 WO 2021241707A1 JP 2021020274 W JP2021020274 W JP 2021020274W WO 2021241707 A1 WO2021241707 A1 WO 2021241707A1
Authority
WO
WIPO (PCT)
Prior art keywords
gypsum
boron
reducing agent
mass
water reducing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/020274
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
洋介 佐藤
大介 内藤
夏樹 岡本
正樹 鈴木
陽作 池尾
淳道 櫛部
肇 岡本
丈巳 乗物
雅信 小田川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yoshino Gypsum Co Ltd
Takenaka Corp
Original Assignee
Yoshino Gypsum Co Ltd
Takenaka Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2022526648A priority Critical patent/JP7515836B2/ja
Priority to US17/998,289 priority patent/US20230271885A1/en
Priority to KR1020267004405A priority patent/KR20260029415A/ko
Priority to EP21812325.5A priority patent/EP4137471A4/en
Priority to AU2021280613A priority patent/AU2021280613B2/en
Priority to CA3177973A priority patent/CA3177973A1/en
Application filed by Yoshino Gypsum Co Ltd, Takenaka Corp filed Critical Yoshino Gypsum Co Ltd
Priority to CN202180037520.8A priority patent/CN115667179A/zh
Priority to KR1020227040043A priority patent/KR20230004653A/ko
Publication of WO2021241707A1 publication Critical patent/WO2021241707A1/ja
Priority to SA522441422A priority patent/SA522441422B1/ar
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F1/00—Shielding characterised by the composition of the materials
    • G21F1/02—Selection of uniform shielding materials
    • G21F1/06—Ceramics; Glasses; Refractories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/30—Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B19/00—Machines or methods for applying the material to surfaces to form a permanent layer thereon
    • B28B19/0092—Machines or methods for applying the material to surfaces to form a permanent layer thereon to webs, sheets or the like, e.g. of paper, cardboard
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/32—Carbides; Nitrides; Borides ; Silicides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/36—Inorganic materials not provided for in groups C04B14/022 and C04B14/04 - C04B14/34
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators or shrinkage compensating agents
    • C04B22/0013—Boron compounds
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators or shrinkage compensating agents
    • C04B22/06—Oxides, Hydroxides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators or shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/10—Carbohydrates or derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
    • C04B24/128—Heterocyclic nitrogen compounds
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/16—Sulfur-containing compounds
    • C04B24/18—Lignin sulfonic acid or derivatives thereof, e.g. sulfite lye
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/16—Sulfur-containing compounds
    • C04B24/20—Sulfonated aromatic compounds
    • C04B24/22—Condensation or polymerisation products thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/2641—Polyacrylates; Polymethacrylates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/30—Condensation polymers of aldehydes or ketones
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F1/00—Shielding characterised by the composition of the materials
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F3/00—Shielding characterised by its physical form, e.g. granules, or shape of the material
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
    • C04B2103/302—Water reducers
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
    • C04B2111/0062—Gypsum-paper board like materials
    • C04B2111/00629—Gypsum-paper board like materials the covering sheets being made of material other than paper
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00862—Uses not provided for elsewhere in C04B2111/00 for nuclear applications, e.g. ray-absorbing concrete
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

  • the present invention relates to a neutron-shielding gypsum-based building board and a method for manufacturing a neutron-shielding gypsum-based building board.
  • the radiation use area In the radiation therapy facility, in order to prevent the radiation radiated to the affected area of the patient from leaking out of the radiation use area, the radiation use area is combined with a thick concrete wall or a thick concrete and a metal plate such as iron or lead. It is partitioned by wall materials such as walls. Therefore, when replacing the device for radiotherapy, it is necessary to demolish the wall material such as a concrete wall, replace the device, and then construct the wall again. When the demolished wall material is contaminated with radiation, there is a problem that man-hours and costs are required to dispose of the wall material.
  • Patent Document 1 discloses a radiation shielding wall constructed by stacking dry gypsum blocks formed of a radiation shielding material composition containing water and gypsum.
  • the radiation shielding wall disclosed in Patent Document 1 needs to be formed by stacking dry gypsum blocks, and further improvement in handleability is required.
  • one aspect of the present invention is to provide a neutron-shielding gypsum-based building board having excellent handleability.
  • gypsum and A boron-containing material in which the amount of boron contained is 1.0 part by mass or more and 120 parts by mass or less with respect to 100 parts by mass of the gypsum.
  • the boron-containing material contains one or more selected from calcium borate, boron carbide, boric acid, boron oxide, sodium borate, and calcium borate.
  • a neutron-shielding gypsum-based building board having a dry specific gravity of 0.65 or more and 1.6 or less.
  • the neutron-shielding gypsum-based building board of the present embodiment (hereinafter, also referred to as "building board”) can contain gypsum, a boron-containing material, and a water reducing agent.
  • the building board of the present embodiment can contain the above-mentioned boron-containing material in a ratio of 1.0 part by mass or more and 120 parts by mass or less of boron to 100 parts by mass of gypsum.
  • the building board can contain the water reducing agent in a ratio of 0.05 parts by mass or more and 2.0 parts by mass or less with respect to 100 parts by mass of gypsum.
  • the boron-containing material preferably contains one or more selected from calcium borate, boron carbide, boric acid, boron oxide, sodium borate, and calcium boride.
  • the building board preferably has a dry specific gravity of 0.65 or more and 1.6 or less.
  • the building board of the present embodiment can have a board shape, that is, a plate shape. According to the building board of the present embodiment, since it has a board shape as described above, it can function as a radiation shielding wall only by fixing it. Therefore, according to the building board of the present embodiment, it is excellent in handleability as compared with a radiation shielding material which has, for example, a block shape and needs to be laminated to form a radiation shielding wall.
  • (1) Containing components The components contained in the building board of the present embodiment will be described below.
  • (1-1) Gypsum The building board of the present embodiment can contain gypsum as described above.
  • Neutron rays can be classified into fast neutrons, fast neutrons, thermal neutrons, etc. according to the magnitude of the energy they have. Then, among the above neutron rays, the energy of fast neutrons is decelerated by collision with hydrogen having a large absorption cross section in the energy region. Therefore, from the viewpoint of shielding fast neutron rays, it is preferable to use a material having a high hydrogen density for the building board. Since the hydrated water of gypsum contains hydrogen and the hydrogen density is high, the neutron beam shielding performance of the building board of the present embodiment can be enhanced by containing gypsum.
  • Gypsum is also excellent in moldability and curing speed. Therefore, since the building board of the present embodiment contains gypsum, the building board of the present embodiment, which is a radiation shielding material, can be manufactured with high productivity. (1-2) Boron-Containing Material
  • the building board of the present embodiment may further contain boron for the purpose of improving the radiation shielding performance against various types of radiation. Neutron rays, especially neutrons with energy in the thermal neutron beam region, are absorbed by the nuclei of boron. Therefore, when the building board of the present embodiment contains boron, the neutron beam shielding performance of the building board can be improved.
  • the neutron beam particularly the fast neutron beam and the thermal neutron beam can be shielded by containing gypsum and boron.
  • the building board of the present embodiment can contain boron as, for example, a boron-containing material.
  • the boron-containing material is not particularly limited as long as it is a material containing boron, but preferably contains one or more selected from calcium borate, boron carbide, boric acid, boron oxide, sodium borate, and calcium boride. ..
  • the boron-containing material can contain one or more selected from the compounds of the above-mentioned suitable boron-containing materials such as calcium borate. Therefore, as the boron-containing material, one or more compounds selected from the above compounds further containing, for example, hydrated water can be used. Further, as the boron-containing material, a mineral containing at least one selected from the compounds of the above-mentioned suitable boron-containing material can also be used. Specifically, for example, when the boron-containing material contains calcium borate, cholemanite can also be used as the boron-containing material.
  • the boron-containing material contains sodium borate, borax or the like can be used as the boron-containing material.
  • the boron-containing material may be composed of only one or more selected from the compounds of the above-mentioned suitable boron-containing materials such as calcium borate.
  • the boron-containing material contains at least one selected from calcium borate and boron carbide, and even more preferably contains one or more selected from cholemanite and boron carbide.
  • Colemanite is a stable material, so it is easy to handle, and it is inexpensive, so it can be suitably used. Further, boron carbide is a particularly stable material and is excellent in handleability, so that it can be suitably used.
  • the building board of the present embodiment preferably contains a boron-containing material in a proportion of 1.0 part by mass or more and 120 parts by mass or less of boron with respect to 100 parts by mass of gypsum. It is more preferable that the content is in a proportion of 0 parts by mass or more and 120 parts by mass or less.
  • the gypsum 100 parts by weight is meant the ratio of gypsum (CaSO 4 ⁇ 2H 2 O) 100 parts by weight.
  • the gypsum is usually dihydrate gypsum.
  • the building board may contain gypsum other than dihydrate gypsum as gypsum, for example, hemihydrate gypsum, but all the gypsum components contained in the building board are considered to form dihydrate gypsum.
  • the amount (ratio) of boron contained in the boron-containing material with respect to 100 parts by mass of gypsum can be obtained. The same applies to the water reducing agent described later.
  • the neutron beam shielding performance of the building board can be sufficiently improved.
  • the building board of the present embodiment can be manufactured by a pouring molding method. Therefore, the productivity can be improved as compared with the case of manufacturing by the extrusion molding method or the papermaking method, which has been conventionally used when manufacturing the radiation shielding material.
  • a water reducing agent in order to improve the dispersibility of gypsum or the like in the gypsum slurry and improve the fluidity of the gypsum slurry to be poured.
  • the water reducing agent is not particularly limited, and for example, a water reducing agent conventionally used in producing a cured gypsum body can be used.
  • the water reducing agent was selected from, for example, a naphthalene-based water reducing agent, a polycarboxylic acid-based water reducing agent, a lignin-based water reducing agent, a melamine-based water reducing agent, an aminosulfonic acid-based water reducing agent, a phosphoric acid-based water reducing agent, and a bisphenol-based water reducing agent.
  • a naphthalene-based water reducing agent was selected from, for example, a naphthalene-based water reducing agent, a polycarboxylic acid-based water reducing agent, a lignin-based water reducing agent, a melamine-based water reducing agent, an aminosulfonic acid-based water reducing agent, a phosphoric acid-based water reducing agent, and
  • the water reducing agent is preferably selected according to the boron-containing material used.
  • the water reducing agent is preferably one or more selected from a naphthalene-based water reducing agent and a melamine-based water reducing agent.
  • the water reducing agent is preferably one or more selected from a naphthalene-based water reducing agent, a polycarboxylic acid-based water reducing agent, a lignin-based water reducing agent, and a melamine-based water reducing agent. ..
  • the gypsum slurry can be easily made to have the desired viscosity while suppressing the amount of the water reducing agent used by using the above water reducing agents respectively.
  • the building board of the present embodiment preferably contains a water reducing agent in a proportion of 0.05 parts by mass or more and 2.0 parts by mass or less with respect to 100 parts by mass of gypsum.
  • to 100 parts by mass of gypsum means the ratio to 100 parts by mass of dihydrate gypsum.
  • the content ratio of the water reducing agent By setting the content ratio of the water reducing agent to 0.05 parts by mass or more, the dispersibility of gypsum or the like in the gypsum slurry for manufacturing a building board can be enhanced, and the gypsum slurry can have a predetermined viscosity. Therefore, it is possible to obtain a building board that can be manufactured with high productivity.
  • the building board may contain any ingredient other than the gypsum, the boron-containing material and the water reducing agent described above.
  • the building board of the present embodiment can also contain bubbles caused by such bubbles.
  • the dry specific gravity of the building board can be set in a desired range.
  • the building board can also contain various additives.
  • Additives include strength improvers such as starch and polyvinyl alcohol, inorganic fibers such as glass fibers and lightweight aggregates, fireproof materials such as vermiculite, coagulation adjusters, and foam diameter adjusters such as sulfosuccinate-type surfactants. , Water repellents such as silicone and paraffin, and the like.
  • shape and physical properties of the building board (2-1) Shape and structure
  • the building board of the present embodiment may have a board shape as shown in the perspective view schematically shown in FIG. , The detailed configuration is not particularly limited. Since the building board of the present embodiment is preferably manufactured by the pouring molding method as described above, a surface material such as a base paper for a board or a glass fiber non-woven fabric can be arranged on the surface side.
  • the building board 10 of the present embodiment has surface materials on the first surface 101 side and the second surface 102 side located on the side opposite to the first surface 101. It is preferable that 11 is arranged.
  • the surface material 11 is not particularly limited and can be selected according to the type of building board to be manufactured.
  • the building board 10 of the present embodiment can be, for example, one selected from gypsum board, glass mat gypsum board, and glass fiber non-woven fabric-filled gypsum board. Therefore, as the surface material 11, for example, one selected from a base paper for a board, a glass fiber non-woven fabric, and a glass mat can be mentioned.
  • the gypsum core 12 contains the above-mentioned gypsum, a boron-containing material, and a water reducing agent.
  • the thickness T of the building board of the present embodiment is not particularly limited, but is preferably 9.5 mm or more and 25.0 mm or less, and more preferably 12.5 mm or more and 25.0 mm or less.
  • the thickness T of the building board of the present embodiment is preferably 0.65 or more and 1.6 or less, and more preferably 0.65 or more and 1.3 or less.
  • the dry specific gravity By setting the dry specific gravity to 0.65 or more, the proportion of gypsum contained can be sufficiently increased and the neutron beam shielding performance can be improved.
  • the dry specific density By setting the dry specific density to 1.6 or less, it is possible to make a lightweight building board, and the handleability is particularly improved. Further, by setting the dry specific gravity to 1.6 or less, it is possible to suppress the viscosity of the gypsum slurry used in manufacturing the building board from becoming excessively high, and to increase the productivity.
  • the dry specific gravity can be measured and calculated based on the specific gravity measuring method specified in JIS A 6901 (2014).
  • (2-3) Heat generation The building board of the present embodiment is preferably heat generation grade 2 or higher, that is, heat generation grade 1 or heat generation grade 2 in the heat generation test.
  • the exothermic test referred to here is specified in Annex A of JIS A 6901 (2014).
  • the heat-generating class 1 and heat-generating class 2 have a total calorific value of 8 MJ / m 2 or less until the end of the heating time, and there are no cracks or holes penetrating to the back surface harmful to fire prevention within the heating time, and the heating time.
  • the maximum heat generation rate does not exceed 200 kW / m 2 continuously for 10 seconds or more.
  • the exothermic first grade has a heating time of 20 minutes, and the exothermic second grade has a heating time of 10 minutes.
  • the Building Standards Law limits the building materials that can be used depending on the purpose and scale of the building.
  • the building board of the present embodiment By setting the building board of the present embodiment to have a heat generation level of 2 or higher, it can be applied to the interior restrictions required by the building to be used, so that it can be used in buildings of various uses and scales.
  • the building board can be made into a predetermined heat-generating grade by adjusting the addition amount of an organic component such as starch.
  • Manufacturing method of neutron-shielding gypsum-based building board A method for manufacturing a neutron-shielding gypsum-based building board according to this embodiment will be described.
  • the method for manufacturing a neutron-shielding gypsum-based building board of the present embodiment (hereinafter, also referred to as "method for manufacturing a building board”) can have the following steps.
  • a molding process for molding gypsum slurry. A curing process that cures the molded product obtained in the molding process.
  • the raw material can contain a boron-containing material at a ratio of 1.0 part by mass or more and 120 parts by mass or less of boron contained in 100 parts by mass of dihydrate gypsum.
  • the raw material can contain a water reducing agent in a ratio of 0.05 parts by mass or more and 2.0 parts by mass or less with respect to 100 parts by mass of dihydrate gypsum.
  • the boron-containing material preferably contains one or more selected from calcium borate, boron carbide, boric acid, boron oxide, sodium borate, and calcium boride.
  • the dry specific gravity of the building board obtained after the curing step is preferably 0.65 or more and 1.6 or less.
  • (1) Manufacturing process Each process will be described below.
  • (1-1) Kneading step In the kneading step, gypsum, a boron-containing material, a water reducing agent, and a water-containing raw material can be kneaded. Each raw material will be described.
  • gypsum used in the method for manufacturing a building board of the present embodiment gypsum alone or mixed with natural gypsum, by-product gypsum, flue gas desulfurized gypsum, etc. is fired in the air or in water (including in steam). Either the ⁇ -type or ⁇ -type gypsum obtained can be used alone or as a mixture of both.
  • the gypsum used in the method for producing gypsum plate of the present embodiment may contain a small amount of type III anhydrous gypsum that is produced when the gypsum is obtained.
  • ⁇ -type gypsum For ⁇ -type gypsum, it is necessary to pressurize dihydrate gypsum such as natural gypsum in water or steam using an autoclave. Further, ⁇ -type gypsum can be produced by calcining dihydrate gypsum such as natural gypsum under normal pressure in the atmosphere.
  • the boron-containing material may be any material containing boron, but is selected from calcium borate, boron carbide, boric acid, boron oxide, sodium borate, and calcium borate as described above. It is preferable to include one or more types.
  • the boron-containing material can contain one or more selected from the above-mentioned suitable boron-containing material compounds such as calcium borate. Therefore, as the boron-containing material, one or more compounds selected from the above compounds further containing, for example, hydrated water can be used. Further, as the boron-containing material, a mineral containing at least one selected from the compounds of the above-mentioned suitable boron-containing material can also be used. Specifically, for example, when the boron-containing material contains calcium borate, cholemanite can also be used as the boron-containing material. Further, when the boron-containing material contains sodium borate, borax or the like can be used as the boron-containing material.
  • the boron-containing material may be composed of only one or more selected from the compounds of the above-mentioned suitable boron-containing materials such as calcium borate.
  • the boron-containing material contains at least one selected from calcium borate and boron carbide, and even more preferably contains one or more selected from cholemanite and boron carbide.
  • the raw material used in the method for manufacturing a building board of the present embodiment contains a boron-containing material in a ratio of 1.0 part by mass or more and 120 parts by mass or less with respect to 100 parts by mass of dihydrate gypsum. It is preferable to contain it.
  • the neutron beam shielding performance of the obtained building board can be sufficiently improved.
  • gypsum slurry can be easily prepared when manufacturing a building board, and the obtained building can be obtained.
  • the strength of the board can also be sufficiently increased.
  • the baked gypsum (semi-water gypsum) contained in the raw material changes from baked gypsum to dihydrate gypsum in the process of manufacturing the building board. Therefore, when preparing a raw material, a boron-containing material, a water reducing agent, etc. are used so that the ratio of boron and the water reducing agent described later to 100 parts by mass of dihydrate gypsum becomes a predetermined value when the board is used for construction. It is preferable to weigh and add.
  • the boron-containing material so that the ratio of the mass of boron contained in the boron-containing material to 100 parts by mass of dihydrate gypsum in the case of a building board satisfies the above range.
  • the raw material when the raw material contains, for example, a boron-containing material at a ratio of 10 parts by mass of boron to 100 parts by mass of dihydrate gypsum, the raw material contains the boron-containing material in the raw material. It means that the amount of boron contained is about 11.9 parts by mass with respect to 100 parts by mass of gypsum. This is done by 10 ⁇ 172 ⁇ 145 using 10 parts by mass, which is the amount of boron contained in the boron-containing material, the molecular weight of 172 of the dihydrate gypsum, and the molecular weight of 145 of the baked gypsum with respect to 100 parts by mass of the dihydrate gypsum. Can be calculated.
  • gypsum slurry can be poured and molded by a molding method. Therefore, in order to improve the dispersibility of gypsum or the like in the gypsum slurry and improve the fluidity of the gypsum slurry to be poured, it is preferable that the raw material contains a water reducing agent.
  • the water reducing agent is not particularly limited, and for example, a water reducing agent conventionally used in producing a cured gypsum body can be used.
  • the water reducing agent was selected from, for example, naphthalene-based water reducing agent, polycarboxylic acid-based water reducing agent, lignin-based water reducing agent, melamine-based water reducing agent, aminosulfonic acid-based water reducing agent, phosphoric acid-based water reducing agent, and bisphenol-based water reducing agent. More than one kind can be used.
  • the water reducing agent is preferably selected according to the boron-containing material used.
  • the water reducing agent is preferably one or more selected from a naphthalene-based water reducing agent and a melamine-based water reducing agent.
  • the water reducing agent is preferably one or more selected from a naphthalene-based water reducing agent, a polycarboxylic acid-based water reducing agent, a lignin-based water reducing agent, and a melamine-based water reducing agent. ..
  • the gypsum slurry can be easily made to have the desired viscosity while suppressing the amount of the water reducing agent used by using the above water reducing agents respectively.
  • the raw material preferably contains a water reducing agent in a proportion of 0.05 parts by mass or more and 2.0 parts by mass or less with respect to 100 parts by mass of dihydrate gypsum.
  • the content ratio of the water reducing agent By setting the content ratio of the water reducing agent to 0.05 parts by mass or more, the dispersibility of gypsum or the like in the gypsum slurry can be enhanced and the gypsum slurry can have a predetermined viscosity. Therefore, it is possible to manufacture a building board with high productivity.
  • the raw material can contain water.
  • the amount of water added when forming the gypsum slurry is not particularly limited, and can be any amount depending on the required fluidity, the specific gravity required for the obtained building board, and the like. ..
  • E Other components
  • the raw material of the gypsum slurry may contain any component other than the gypsum, boron-containing material, water reducing agent, and water described above.
  • foam can be added when forming a gypsum slurry.
  • the specific gravity of the building board obtained by adjusting the amount of foam added can be in a desired range.
  • the method of adding foam when forming the gypsum slurry is not particularly limited, and it can be added by any method.
  • a foaming agent foaming agent
  • water water for forming bubbles
  • bubbles are formed by stirring while taking in air, and the formed bubbles are used as gypsum or water (kneaded water of gypsum slurry).
  • foaming agent is added to water (water for forming bubbles) in advance, and bubbles are formed by stirring while taking in air, and the formed bubbles are used as gypsum or water (kneaded water of gypsum slurry).
  • the formed gypsum slurry can be added to the gypsum slurry formed by premixing calcined gypsum, a boron-containing material, a water reducing agent, water and the like to obtain a gypsum slurry to which bubbles have been added.
  • the foaming agent used when forming the foam is not particularly limited, and examples thereof include sodium alkyl sulfate, alkyl ether sulfate, sodium alkylbenzene sulfonic acid, and polyoxyethylene alkyl sulfate.
  • the amount of foam added is not particularly limited, and can be arbitrarily selected according to the specific gravity required for the building board to be produced.
  • the raw material may also contain various additives.
  • the additive include a strength improver such as starch and polyvinyl alcohol, an inorganic fiber such as glass fiber and a lightweight aggregate, a fire resistant material such as vermiculite, a coagulation adjuster, and a foam diameter adjustment such as a sulfosuccinate type surfactant.
  • a strength improver such as starch and polyvinyl alcohol
  • an inorganic fiber such as glass fiber and a lightweight aggregate
  • a fire resistant material such as vermiculite
  • a coagulation adjuster e.g., a foam diameter adjustment
  • foam diameter adjustment such as a sulfosuccinate type surfactant.
  • agents such as silicone and paraffin.
  • a solid component of a raw material is mixed and kneaded to form a gypsum composition, and then a liquid component such as water of the raw material is added to the obtained gypsum composition and further kneaded to obtain a gypsum slurry. You can also do it.
  • the means for kneading the raw materials is not particularly limited, and for example, a mixer or the like can be used.
  • the molding step the gypsum slurry obtained in the kneading step can be molded into a desired shape. Specifically, for example, a gypsum slurry can be placed between surface materials for molding.
  • the surface material for example, one selected from board base paper, glass fiber non-woven fabric, and glass mat can be used.
  • FIG. 2 is a side view partially and schematically showing a configuration example of a device for molding gypsum board.
  • the surface cover base paper (board base paper) 211 which is the surface material, is transported along the production line from the right side to the left side in the figure.
  • the mixer 22 can be placed at a predetermined position associated with the transfer line, for example, above or beside the transfer line. Then, in a single mixer 22, gypsum slurry can be produced by kneading gypsum, which is a raw material of gypsum slurry, a boron-containing material, a water reducing agent, water, and in some cases, various additives.
  • gypsum is a raw material of gypsum slurry, a boron-containing material, a water reducing agent, water, and in some cases, various additives.
  • a solid such as gypsum can be mixed and stirred in advance to form a gypsum composition which is a mixture, and then supplied to the mixer 22.
  • foam can be added from the gypsum slurry distribution ports 221, 222, 223, and the amount of foam added can be adjusted to obtain a gypsum slurry having an arbitrary density. For example, by adjusting the amount of foam added, the first gypsum slurry 23 and the second gypsum slurry 24 having different densities can be prepared.
  • the foam can also be supplied to the mixer 22 together with other raw materials of the gypsum slurry instead of the sampling port.
  • the obtained first gypsum slurry 23 is supplied onto the front cover base paper (board base paper) 211 and the back cover base paper (board base paper) 212 on the upstream side of the roll coater 26 through the delivery pipes 251, 252. ..
  • the upstream side means the upstream side in the transport direction of the front cover base paper 211 and the back cover base paper 212.
  • the first gypsum slurry 23 on the front cover base paper 211 and the back cover base paper 212 each reach the extension portion of the roll coater 26 and are extended at the extension portion.
  • the roll coater 26 has a coating roll 261 and a receiving roll 262, and a debris removing roll 263, and the first gypsum slurry 23 is spread by these rolls.
  • a thin layer of the first gypsum slurry 23 is formed on the surface cover base paper 211.
  • a thin layer of the first gypsum slurry 23 is formed on the back cover base paper 212.
  • FIG. 2 shows an example in which the first gypsum slurry 23 is applied to the front cover base paper 211 and the back cover base paper 212 using the roll coater 26, but the present invention is not limited to this form.
  • the roll coater 26 may be used to apply the first gypsum slurry 23 to only one of the front cover base paper 211 and the back cover base paper 212.
  • the first gypsum slurry 23 can be arranged only on the side end portion of the surface cover base paper 211.
  • the front cover base paper 211 is conveyed as it is, and the back cover base paper 212 is turned in the direction of the transport line of the front cover base paper 211 by the turning roller 27. Then, both the front cover base paper 211 and the back cover base paper 212 reach the molding machine 28.
  • the second gypsum slurry 24 is supplied from the mixer 22 through the conduit 253 between the thin layers formed on the front cover base paper 211 and the back cover base paper 212. Therefore, between the front cover base paper 211 and the back cover base paper 212, a layer formed by the first gypsum slurry 23, a layer formed by the second gypsum slurry 24, and a first gypsum slurry 23. It is possible to form a continuous laminated body in which the layers formed by Gypsum are laminated.
  • FIG. 2 shows an example in which the first gypsum slurry 23 and the second gypsum slurry 24 are manufactured by one mixer 22, but two mixers are provided and each mixer has the first gypsum slurry 23. , The second gypsum slurry 24 may be manufactured.
  • the form is not limited to the use of the first gypsum slurry and the second gypsum slurry, for example, in the form of producing a gypsum slurry having one kind of density and supplying the gypsum slurry on a board base paper. May be there.
  • a gypsum slurry having a predetermined density is supplied and deposited on a surface cover base paper (base paper for a board) that is continuously conveyed. Then, the lower paper is folded along the engraved lines attached to both end edges so as to wrap the gypsum slurry. At this time, the back cover base paper (board base paper) transported at the same speed is overlaid on the layer of the gypsum slurry. Then, it is molded by passing through a molding machine that determines the thickness and width of the gypsum board. Gypsum board can also be molded by the above procedure.
  • gypsum board as a building board
  • various building boards can be manufactured by changing the base paper for a board, which is a surface material, to a glass fiber non-woven fabric (glass tissue), a glass mat, or the like, and arranging the board so as to be buried on the surface or near the surface.
  • a curing step of hydrating and curing the gypsum slurry can be carried out.
  • the hardening step can be carried out by allowing acicular crystals of dihydrate gypsum to be formed by a hydration reaction of the baked gypsum (hemihydrate gypsum) in the gypsum slurry to condense and solidify. Therefore, the curing step can be carried out by reacting between the gypsum contained in the gypsum slurry and water in the molded body formed in the molding step and the hydration reaction of the gypsum progresses.
  • the building board manufacturing method of the present embodiment further includes an arbitrary step such as a rough cutting step, a drying step, a cutting step, and a loading step, if necessary. Can be done.
  • (1-4-1) Rough cutting step For example, after the above molding step, a rough cutting step of roughly cutting the molded product formed in the molding step with a rough cutting cutter is carried out while the curing step is in progress or after the curing step is completed. You may.
  • the rough cutting cutter can cut the continuous molded body formed in the molding step to a predetermined length.
  • (1-4-2) Drying Step In addition, a drying step of drying excess water from the molded product formed in the molding process or the molded product roughly cut in the rough cutting step can be carried out. In the drying step, a molded product having been cured can be supplied. The drying step can be carried out by forcibly drying the molded product using a dryer.
  • the method for forcibly drying the molded product with a dryer is not particularly limited, but for example, a dryer is provided on the transport path of the molded product, and the molded product is continuously dried by passing through the dryer. can do. It is also possible to carry the molded product into the dryer and dry the molded product for each batch. (1-4-3) Cutting step, loading step Further, for example, a cutting step of cutting a molded product into a product having a predetermined length after drying, a obtained gypsum cured product, a gypsum board, etc. It is possible to carry out a loading process or the like of stacking, storing in a warehouse, or loading onto a truck or the like for shipping.
  • the obtained building board may have a board shape, and its detailed configuration is not particularly limited, but it is manufactured by the casting method as described above, so that it is on the surface side. A surface material such as base paper for board or glass fiber non-woven fabric can be placed on the surface.
  • the surface material examples include one selected from board base paper, glass fiber non-woven fabric, and glass mat.
  • the surface material may be arranged on the outermost surface of the gypsum core, or may be arranged so that a part or the whole thereof is embedded in the gypsum core.
  • (2-2) Dry Specific Density The dry specific gravity of the building board obtained after the curing step is preferably 0.65 or more and 1.6 or less, and more preferably 0.65 or more and 1.3 or less.
  • the dry specific gravity By setting the dry specific gravity to 0.65 or more, the proportion of gypsum contained can be sufficiently increased and the neutron beam shielding performance can be improved.
  • the dry specific density By setting the dry specific density to 1.6 or less, it is possible to make a lightweight building board, and the handleability is particularly improved. Further, by setting the dry specific gravity to 1.6 or less, it is possible to suppress the viscosity of the gypsum slurry prepared in the kneading step from becoming excessively high and to increase the productivity.
  • (2-3) Heat-generating board The building board obtained after the curing step is preferably heat-generating grade 2 or higher in the heat-generating test.
  • the obtained building board By setting the obtained building board to heat generation level 2 or higher, it can be applied to the interior restrictions required by the building to be used, so it can be used in buildings of various uses and scales. For example, by adjusting the amount of an organic component such as starch added, a predetermined exothermic grade can be obtained.
  • the compressive strength of the manufactured building board was measured using an autograph (model: AG-10NKI manufactured by Shimadzu Corporation).
  • the prepared building board was cut out to have a size of 2 cm in length ⁇ 2 cm in width on a surface perpendicular to the thickness direction and used as a test piece.
  • the height of each test piece is equal to the thickness of each building board. For example, in the case of Experimental Example 1-1 below, the height of the test piece is 15 mm, which is the same as the thickness of the manufactured building board.
  • the load applied to the test piece was set to 3 mm / min. (Fever test)
  • the exothermic test was carried out according to Annex A of JIS A 6901 (2014).
  • the neutron beam shielding performance of the building board having the composition prepared in each experimental example was evaluated using a rectangular parallelepiped analysis model having a length of 20 cm, a width of 20 cm, and a thickness of 20 cm. Then, from the neutron beam shielding performance obtained from the analysis results of the above analysis model, the neutron beam shielding rate was calculated by adding the thickness of the building board produced in the following experimental example.
  • PHITS Particle and heavy ion transport code system
  • Experimental Examples 1-1 to 1-11, Experimental Examples 2-1 to 2-8 are Examples, Experimental Examples 1-12 to 1-18, Experimental Examples 2-9, and Experimental Examples 2-10. Is a comparative example.
  • [Experimental Example 1-1] A gypsum board was manufactured as a building board using the device shown in FIG.
  • the procedure for producing gypsum board will be described with reference to FIG. (Kneading process)
  • the surface cover base paper (board base paper) 211 is continuously conveyed along the production line from the right side to the left side in FIG. 2.
  • ⁇ -type gypsum, boron-containing material, colemanite, naphthalene-based water reducing agent, and water-containing raw material were mixed.
  • the amount of foam to be added was adjusted.
  • the foam was prepared by foaming a foaming agent (main component: alkyl ether sulfate).
  • the raw material contains choremanite in a ratio of 5.6 parts by mass of boron to 100 parts by mass of dihydrate gypsum. Further, the raw material contains a naphthalene-based water reducing agent in a ratio of 1.5 parts by mass with respect to 100 parts by mass of dihydrate gypsum. It was confirmed by ICP emission spectroscopic analysis that the obtained gypsum board also contained each component in the same ratio. The same was true for the following other experimental examples.
  • the gypsum slurry obtained in the mixer 22 is supplied onto the front cover base paper 211 and the back cover base paper (board base paper) 212 on the upstream side of the roll coater 26 from the sampling ports 221 and 222 through the delivery pipes 251 and 252. bottom.
  • the first gypsum slurry 23 on the front cover base paper 211 and the back cover base paper 212 each reach the extension portion of the roll coater 26 and are spread.
  • a thin layer of the first gypsum slurry 23 is formed on the surface cover base paper 211.
  • a thin layer of the first gypsum slurry 23 is formed on the back cover base paper 212.
  • the front cover base paper 211 is conveyed as it is, and the back cover base paper 212 is turned in the direction of the transport line of the front cover base paper 211 by the turning roller 27.
  • both the front cover base paper 211 and the back cover base paper 212 reach the molding machine 28.
  • the second gypsum slurry 24 is supplied through the pipe line 253 between the front cover base paper 211, which is the base paper for the board, and the thin layer formed on the back cover base paper 212.
  • the molding machine 28 by passing through the molding machine 28, a continuous layer formed by the first gypsum slurry 23 and the second gypsum slurry 24 is arranged between the front cover base paper 211 and the back cover base paper 212. Laminated body is formed. At this time, the gypsum board was molded so as to have a thickness of 15 mm. (Curing process) The obtained molded product, specifically gypsum slurry, was cured in the process of transportation. (Rough cutting process) The molded product hardens and leads to a rough cutting cutter (not shown).
  • a continuous molded body was cut into a plate-shaped body of a predetermined length by a rough cutting cutter to form a semi-finished product of gypsum board, which is a plate-shaped body composed of a core material mainly composed of gypsum covered with base paper. ..
  • the coarsely cut molded product was passed through a dryer (not shown) and forcibly dried to remove excess water.
  • Cut process After the drying process, the product was cut into a product having a predetermined length to obtain gypsum board, which is a building board.
  • Example 1-4 When preparing the gypsum slurry in the kneading step, the amount of water to be added was adjusted so that the specific gravity of the obtained gypsum board was 1.3, but the gypsum was the same as in Experimental Example 1-1. The board was manufactured and evaluated. The evaluation results are shown in Table 1.
  • Example 1-5 Experimental Example 1-6
  • the amount of the water reducing agent contained in the raw material was 0.8 parts by mass (Experimental Example 1-5) and 0.1 parts by mass (1-5 parts by mass) with respect to 100 parts by mass of dihydrate gypsum. Experimental example 1-6) was used.
  • Example 1-7 A gypsum board was manufactured and evaluated in the same manner as in Experimental Example 1-1, except that a melamine-based water reducing agent was used instead of the naphthalene-based water reducing agent when preparing the gypsum slurry in the kneading step. .. The evaluation results are shown in Table 1.
  • Example 1-8 Experimental Example 1-9
  • a gypsum board was manufactured and evaluated in the same manner as in Experimental Example 1-1, except that the thickness of the gypsum board to be manufactured was set to the value shown in Table 1 in the molding step. The evaluation results are shown in Table 1.
  • Example 1-10 When preparing the gypsum slurry in the kneading step, the amount of the water reducing agent contained in the raw material was 1.0 part by mass with respect to 100 parts by mass of the dihydrate gypsum in the same manner as in Experimental Example 1-1. Gypsum board was manufactured and evaluated. The evaluation results are shown in Table 1.
  • Example 1-11 When preparing the gypsum slurry in the kneading step, a melamine-based water reducing agent was used as the water reducing agent, and the amount of the water reducing agent contained in the raw material was 1.0 part by mass with respect to 100 parts by mass of the dihydrate gypsum. Except for the above points, gypsum board was manufactured and evaluated in the same manner as in Experimental Example 1-1. The evaluation results are shown in Table 1.
  • Example 1-14 Experimental Example 1-15
  • the amount of the water reducing agent contained in the raw material was 3.0 parts by mass (Experimental Example 1-14) and 0.02 parts by mass (Experimental Example 1-14) with respect to 100 parts by mass of dihydrate gypsum.
  • Experimental example 1-15 was used. Except for the above points, gypsum board was manufactured and evaluated in the same manner as in Experimental Example 1-1. The evaluation results are shown in Table 1.
  • Example 1-16 to 1-18 When preparing a gypsum slurry in the kneading step, a melamine-based water reducing agent (Experimental Example 1-16), a lignin-based water reducing agent (Experimental Example 1-17), and a polycarboxylic acid-based water reducing agent (Experimental Example 1-18) are used as water reducing agents. ) was used respectively. Except for the above points, gypsum board was manufactured and evaluated in the same manner as in Experimental Example 1-14. The evaluation results are shown in Table 1.
  • Example 2-1 In preparing the gypsum slurry in the kneading step, using a boron carbide (B 4 C) as a boron-containing material, the amount of water reducing agent material contains, per 100 parts by weight of gypsum, 0.8 part by weight And said. Except for the above points, gypsum board was manufactured and evaluated in the same manner as in Experimental Example 1-1. The evaluation results are shown in Table 1.
  • Example 2-4 When preparing the gypsum slurry in the kneading step, the amount of the water reducing agent contained in the raw material was the same as in Experimental Example 2-1 except that the amount was 2.0 parts by mass with respect to 100 parts by mass of dihydrate gypsum. Gypsum board was manufactured and evaluated. The evaluation results are shown in Table 1.
  • Example 2-5 A gypsum board was manufactured and evaluated in the same manner as in Experimental Example 2-1 except that a polycarboxylic acid-based water reducing agent was used instead of the naphthalene-based water reducing agent when preparing the gypsum slurry in the kneading step. went. The evaluation results are shown in Table 1.
  • Example 2-6 When preparing the gypsum slurry in the kneading step, the amount of the water reducing agent contained in the raw material was set to 1.5 parts by mass with respect to 100 parts by mass of the dihydrate gypsum. Further, when preparing the gypsum slurry in the kneading step, the amount of water to be added was adjusted so that the specific gravity of the obtained gypsum board was 1.5. Except for the above points, gypsum board was manufactured and evaluated in the same manner as in Experimental Example 2-5. The evaluation results are shown in Table 1.
  • Example 2-7 Experimental Example 2-8
  • Experimental examples except that a lignin-based water reducing agent (Experimental Example 2-7) and a melamine-based water reducing agent (Experimental Example 2-8) were used instead of the naphthalene-based water reducing agent when preparing the gypsum slurry in the kneading step.
  • a gypsum board was manufactured and evaluated in the same manner as in the case of 2-1. The evaluation results are shown in Table 1.
  • Example 2-9 When preparing the gypsum slurry in the kneading step, the amount of boron carbide contained in the raw material was adjusted so that the amount of boron contained was 313.2 parts by mass with respect to 100 parts by mass of dihydrate gypsum. Except for the above points, gypsum board was manufactured and evaluated in the same manner as in Experimental Example 2-1. The evaluation results are shown in Table 1. [Experimental Example 2-10] A polycarboxylic acid-based water reducing agent was used instead of the naphthalene-based water reducing agent, and the amount of the water reducing agent contained in the raw material was 1.5 parts by mass with respect to 100 parts by mass of dihydrate gypsum.
  • the gypsum boards produced in Experimental Examples 1-1 to 1-11 and Experimental Examples 2-1 to 2-8 are all having a neutron beam shielding rate of more than 60%. It was confirmed that it has sufficient neutron beam shielding performance.
  • All of these gypsum boards have a board shape, that is, a plate shape. Therefore, it was confirmed that it could function as a radiation shielding wall only by fixing it, and that it was excellent in handleability.
  • the gypsum board manufactured in Experimental Example 1-13 had too much boron-containing material, so that the gypsum board manufactured was brittle and could not be subjected to a compressive strength test or the like.
  • the gypsum board produced in Experimental Example 2-9 is presumed to have a high neutron beam shielding rate due to the high content of boron, but the compounding ratio of gypsum etc. decreases, so the obtained gypsum board is compressed. It was confirmed that the strength was low and it was not suitable for practical use. Since the compressive strength of gypsum board is low and not suitable for practical use, the neutron beam shielding rate was not evaluated.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Physics & Mathematics (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Molecular Biology (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Laminated Bodies (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Building Environments (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
PCT/JP2021/020274 2020-05-29 2021-05-27 中性子線遮蔽石膏系建築用ボード、中性子線遮蔽石膏系建築用ボードの製造方法 Ceased WO2021241707A1 (ja)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US17/998,289 US20230271885A1 (en) 2020-05-29 2021-05-27 Neutron beam shielding gypsum-based building board and method of manufacturing neutron beam shielding gypsum-based building board
KR1020267004405A KR20260029415A (ko) 2020-05-29 2021-05-27 중성자선 차폐 석고계 건축용 보드 및 중성자선 차폐 석고계 건축용 보드 제조방법
EP21812325.5A EP4137471A4 (en) 2020-05-29 2021-05-27 Neutron beam shielding gypsum-based construction board, and method for producing neutron beam shielding gypsum-based construction board
AU2021280613A AU2021280613B2 (en) 2020-05-29 2021-05-27 neutron beam shielding gypsum-based construction board, and method for producing neutron beam shielding gypsum-based construction board
CA3177973A CA3177973A1 (en) 2020-05-29 2021-05-27 Neutron beam shielding gypsum-based building board, and method of manufacturing neutron beam shielding gypsum-based building board
JP2022526648A JP7515836B2 (ja) 2020-05-29 2021-05-27 中性子線遮蔽石膏系建築用ボード、中性子線遮蔽石膏系建築用ボードの製造方法
CN202180037520.8A CN115667179A (zh) 2020-05-29 2021-05-27 中子束遮蔽石膏系建筑用板、中子束遮蔽石膏系建筑用板的制造方法
KR1020227040043A KR20230004653A (ko) 2020-05-29 2021-05-27 중성자선 차폐 석고계 건축용 보드 및 중성자선 차폐 석고계 건축용 보드 제조방법
SA522441422A SA522441422B1 (ar) 2020-05-29 2022-11-23 لوح بناء معتمد على الجبس واقي من الأشعة النيوترونية وطريقة لتصنيع لوح البناء المعتمد على الجبس الواقي من الأشعة النيوترونية

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020094834 2020-05-29
JP2020-094834 2020-05-29

Publications (1)

Publication Number Publication Date
WO2021241707A1 true WO2021241707A1 (ja) 2021-12-02

Family

ID=78744653

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/020274 Ceased WO2021241707A1 (ja) 2020-05-29 2021-05-27 中性子線遮蔽石膏系建築用ボード、中性子線遮蔽石膏系建築用ボードの製造方法

Country Status (10)

Country Link
US (1) US20230271885A1 (https=)
EP (1) EP4137471A4 (https=)
JP (1) JP7515836B2 (https=)
KR (2) KR20230004653A (https=)
CN (1) CN115667179A (https=)
AU (1) AU2021280613B2 (https=)
CA (1) CA3177973A1 (https=)
SA (1) SA522441422B1 (https=)
TW (1) TW202212287A (https=)
WO (1) WO2021241707A1 (https=)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023088897A (ja) * 2021-12-15 2023-06-27 株式会社三栄建築設計 板状建築資材、積層板、および板状建築資材の製造方法
JPWO2023127776A1 (https=) * 2021-12-28 2023-07-06
CN118026728A (zh) * 2024-01-03 2024-05-14 中建材创新科技研究院有限公司 具有中子屏蔽功能的纸面石膏板及其制备方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010540292A (ja) * 2007-10-05 2010-12-24 クナウフ ギプス カーゲー 硫酸カルシウム‐硫酸バリウムをベースとする建築ボードの製造方法
JP2012127725A (ja) * 2010-12-14 2012-07-05 Taiheiyo Consultant:Kk 中性子吸収体
JP2013184853A (ja) * 2012-03-08 2013-09-19 Giken Kogyo Kk 放射線遮蔽ボード
JP2014089127A (ja) 2012-10-30 2014-05-15 Takenaka Komuten Co Ltd 放射線遮蔽壁
JP2016166739A (ja) * 2015-02-26 2016-09-15 有限会社技研産業 放射線遮蔽組成物、放射線遮蔽材料及び放射線遮蔽建材
JP2020094834A (ja) 2018-12-10 2020-06-18 株式会社タダノ 地表面推定方法、計測領域表示システムおよびクレーン

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5128819A (ja) * 1974-09-05 1976-03-11 Chiyoda Kenzai Kogyo Taikaseinitomusetsukoboodonoseizohoho
JPS5819632B2 (ja) * 1978-07-25 1983-04-19 三井東圧化学株式会社 不燃性低比重石こう板
JPH09142915A (ja) * 1995-11-21 1997-06-03 Yoshino Sekko Kk 撥水性石膏ボード
US6214454B1 (en) * 1996-09-25 2001-04-10 Nippon Paint Co., Ltd. Electromagnetic wave absorbing material
JP4213365B2 (ja) * 2000-10-10 2009-01-21 吉野石膏株式会社 石膏ボード、石膏ボードの製造方法、建築物の内装構造、及び建築物の内装構造の改修方法
JP2002145655A (ja) * 2000-11-07 2002-05-22 Yoshino Gypsum Co Ltd 石膏系建材
US8117013B2 (en) * 2006-12-11 2012-02-14 The United States Of America As Represented By The Adminstrator Of The National Aeronautics And Space Administration Apparatus, method and program storage device for determining high-energy neutron/ion transport to a target of interest
JP2008157801A (ja) * 2006-12-25 2008-07-10 Fujita Corp 中性子遮蔽低放射化コンクリートおよびモルタル
KR101423098B1 (ko) 2013-01-04 2014-07-25 권정희 연소조절이 가능한 휴대형 석유버너
CN108218371B (zh) * 2016-12-15 2020-08-25 北新集团建材股份有限公司 一种防水防辐射的纸面石膏板及其制备方法
KR101952817B1 (ko) * 2017-06-07 2019-02-27 성신양회(주) 중성자 차폐성능을 향상시키기 위한 콘크리트 조성물
JP7014369B2 (ja) * 2018-04-19 2022-02-15 株式会社竹中工務店 放射線遮蔽ボード及び放射線遮蔽ボードの製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010540292A (ja) * 2007-10-05 2010-12-24 クナウフ ギプス カーゲー 硫酸カルシウム‐硫酸バリウムをベースとする建築ボードの製造方法
JP2012127725A (ja) * 2010-12-14 2012-07-05 Taiheiyo Consultant:Kk 中性子吸収体
JP2013184853A (ja) * 2012-03-08 2013-09-19 Giken Kogyo Kk 放射線遮蔽ボード
JP2014089127A (ja) 2012-10-30 2014-05-15 Takenaka Komuten Co Ltd 放射線遮蔽壁
JP2016166739A (ja) * 2015-02-26 2016-09-15 有限会社技研産業 放射線遮蔽組成物、放射線遮蔽材料及び放射線遮蔽建材
JP2020094834A (ja) 2018-12-10 2020-06-18 株式会社タダノ 地表面推定方法、計測領域表示システムおよびクレーン

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4137471A4

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023088897A (ja) * 2021-12-15 2023-06-27 株式会社三栄建築設計 板状建築資材、積層板、および板状建築資材の製造方法
JP7360136B2 (ja) 2021-12-15 2023-10-12 株式会社三栄建築設計 板状建築資材、積層板、および板状建築資材の製造方法
JPWO2023127776A1 (https=) * 2021-12-28 2023-07-06
WO2023127776A1 (ja) * 2021-12-28 2023-07-06 吉野石膏株式会社 石膏組成物の製造方法、石膏組成物、石膏組成物用の鉱物原料及び硬化体の製造方法
JP7722739B2 (ja) 2021-12-28 2025-08-13 吉野石膏株式会社 石膏組成物の製造方法、石膏組成物、石膏組成物用の鉱物原料及び硬化体の製造方法
CN118026728A (zh) * 2024-01-03 2024-05-14 中建材创新科技研究院有限公司 具有中子屏蔽功能的纸面石膏板及其制备方法

Also Published As

Publication number Publication date
CA3177973A1 (en) 2021-12-02
US20230271885A1 (en) 2023-08-31
KR20230004653A (ko) 2023-01-06
EP4137471A1 (en) 2023-02-22
AU2021280613B2 (en) 2026-04-23
CN115667179A (zh) 2023-01-31
JP7515836B2 (ja) 2024-07-16
SA522441422B1 (ar) 2024-07-31
AU2021280613A1 (en) 2023-01-19
JPWO2021241707A1 (https=) 2021-12-02
EP4137471A4 (en) 2023-11-15
KR20260029415A (ko) 2026-03-04
TW202212287A (zh) 2022-04-01

Similar Documents

Publication Publication Date Title
EP2190797B1 (en) Method for reducing water in a gypsum slurry
US8088218B2 (en) Foamed slurry and building panel made therefrom
US8142915B2 (en) Foamed slurry and building panel made therefrom
JP7515836B2 (ja) 中性子線遮蔽石膏系建築用ボード、中性子線遮蔽石膏系建築用ボードの製造方法
JP2010513213A (ja) ナフタレンスルホネートおよび変性剤を含む石膏組成物
AU2006259588B2 (en) Effective use of dispersants in wallboard containing foam
US9328025B2 (en) Effective use of melamine sulfonate condensate dispersants in wallboard containing foam
NZ563237A (en) Effective use of dispersants in wallboard containing foam
JP5669992B2 (ja) 石膏系建材、および、石膏系建材の製造方法
JP6389826B2 (ja) 石膏スラリー、石膏硬化体、石膏系建材、石膏ボード、石膏スラリーの製造方法、石膏硬化体の製造方法、石膏系建材の製造方法、石膏ボードの製
KR20080034128A (ko) 개질제 및 분산제를 사용한 석고 슬러리 제조방법
JP2015214050A (ja) 石膏硬化体、石膏板、石膏硬化体の製造方法、石膏ボードの製造方法
RU2805440C1 (ru) Экранирующая пучки нейтронов строительная панель на основе гипса и способ изготовления экранирующей пучки нейтронов строительной панели на основе гипса
JP6320416B2 (ja) 硫酸カルシウムベースの製品
HK40080083A (en) Neutron beam shielding gypsum-based construction board, and method for producing neutron beam shielding gypsum-based construction board
WO2020214126A2 (en) Production method of a construction element and a construction element produced by this method
KR20250142854A (ko) 소수성 석고 코어를 갖는 코팅된 석고 경화 안정화 입자, 이를 포함하는 석고 보드, 입자 제조 공정 및 석고 보드 제조 공정
JP2023146922A (ja) 耐火断熱組成物、耐火断熱組成物スラリー、耐火断熱板及び耐火断熱構造体
HK1120019A (en) Siloxane polymerization in wallboard

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21812325

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 3177973

Country of ref document: CA

ENP Entry into the national phase

Ref document number: 2022526648

Country of ref document: JP

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 20227040043

Country of ref document: KR

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 2021812325

Country of ref document: EP

Effective date: 20221114

WWE Wipo information: entry into national phase

Ref document number: 2022130305

Country of ref document: RU

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2021280613

Country of ref document: AU

Date of ref document: 20210527

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 522441422

Country of ref document: SA

WWE Wipo information: entry into national phase

Ref document number: 522441422

Country of ref document: SA

WWG Wipo information: grant in national office

Ref document number: 522441422

Country of ref document: SA

WWR Wipo information: refused in national office

Ref document number: 1020227040043

Country of ref document: KR

WWD Wipo information: divisional of initial pct application

Ref document number: 1020267004405

Country of ref document: KR

WWP Wipo information: published in national office

Ref document number: 1020267004405

Country of ref document: KR