EP0242227B1 - Elastomeric neutron protection material - Google Patents

Elastomeric neutron protection material Download PDF

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Publication number
EP0242227B1
EP0242227B1 EP87303420A EP87303420A EP0242227B1 EP 0242227 B1 EP0242227 B1 EP 0242227B1 EP 87303420 A EP87303420 A EP 87303420A EP 87303420 A EP87303420 A EP 87303420A EP 0242227 B1 EP0242227 B1 EP 0242227B1
Authority
EP
European Patent Office
Prior art keywords
protection material
protection
elastomeric
absorber
hydrogen content
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.)
Expired - Lifetime
Application number
EP87303420A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0242227A3 (en
EP0242227A2 (en
Inventor
Winfried C/O Minnesota Mining And Knorr
Guenther C/O Minnesota Mining And John
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.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
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
Application filed by Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Publication of EP0242227A2 publication Critical patent/EP0242227A2/en
Publication of EP0242227A3 publication Critical patent/EP0242227A3/en
Application granted granted Critical
Publication of EP0242227B1 publication Critical patent/EP0242227B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • G21F1/10—Organic substances; Dispersions in organic carriers

Definitions

  • the invention relates to an elastomeric neutron protection material for decelerating fast neutrons, comprising an elastomeric material having a high hydrogen content and being preferably combined with an absorber material, e.g., boron, for decelerating slow electrons.
  • an absorber material e.g., boron
  • Known elastomeric neutron protection materials of the kind indicated are silicone elastomer-based (German disclosure Letter 28 22 494) or polyurethane-based (German disclosure Letter 32 38 831) and offer important advantages over polyethylene and polypropylene, or even simpler protection materials like water, paraffin and the like, with respect to mechanical and chemical properties, particularly temperature resistivity, toughness, resilient deformability, workability, and chemical durability.
  • the hydrogen content which is the determining factor for the neutron decelerating capability, however, is considerably less than in polyethylene and polypropylene (14.3 weight percent), polyamide (11.6 weight percent) or water (11.1 weight percent), and amounts to about a maximum of 5 to 7 weight percent.
  • Further consideration of other known neutron protection materials (German disclosure Letter 32 38 831) shows that protection materials were not available which combine in themselves good mechanical and chemical properties with a high hydrogen content similar to that of polyethylene.
  • a material which comprises a polymeric reaction product of a reaction between a) at least one polybutadiene-based polyol and b) at least one aliphatic diisocyanate, the reaction product having a hydrogen content of at least 8 weight percent, said protection material having a total hydrogen content of from 10 to 12.5 weight percent.
  • This composition thus provides an elastomeric neutron protection material which exhibits good mechanical, chemical, and physical properties, particularly easy workability, chemical durability, and temperature resistivity, with a particularly high hydrogen content.
  • Elastomeric neutron protection materials in accordance with the invention can be simply prepared like known polyurethanes and have, similar to the latter, very favorable mechanical, chemical and physical properties; the hydrogen content, however, is considerably higher 10 to 12.5 weight percent, which is up to double the hydrogen content of known neutron protection materials having comparable elastomeric properties. In any case, a hydrogen content of more than 8 weight percent is desired and readily obtainable.
  • the neutron protection materials according to the invention can be easily combined with absorber materials, particularly boron or boron-containing substances for absorbing slow neutrons.
  • absorber materials particularly boron or boron-containing substances for absorbing slow neutrons.
  • an absorber material such as boron carbide or boron nitride
  • the absorber material can also be provided in chemically bonded form; for instance, the polyols can be partly or totally provided in the form of organic boron compounds, e.g., diol boric acid ester.
  • neutron protection material according to the invention can also be combined with other radiation protection materials, for example with heavy metals or heavy metal compounds, for example in finely divided form as filler material, in order to achieve an additional protection against ionizing radiation.
  • the preparation of the neutron protection materials in accordance with the invention basically may be performed in the same manner as the preparation of known polyurethanes, and with the use of corresponding catalysts. If the two components are brought to reaction, the OH radicals of the polyol react with the NCO radicals of the isocyanate.
  • the favorable properties of the neutron protection materials according to the invention are based essentially due on the fact that polybutadiene-based polyol have a hydrogen content similar to that of polyethylene and result in reaction products which have a high elasticity and a high durability against shock loads.
  • the aliphatic diisocyanates used in accordance with the invention have higher hydrogen contents than the usually employed aromatic diisocyanates and result in reaction products having a high temperature resistivity.
  • particularly trifunctional crosslinking agents can be employed which offer advantages because of their high reactivity; such crosslinking agents are not applicable with aromatic isocyanates.
  • Particularly well suited are crosslinking agents from the group nitrolo tripropanol, triethanolamine and nitrotributanol.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Polyurethanes Or Polyureas (AREA)
EP87303420A 1986-04-17 1987-04-16 Elastomeric neutron protection material Expired - Lifetime EP0242227B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3612971 1986-04-17
DE3612971A DE3612971C2 (de) 1986-04-17 1986-04-17 Verfahren zur Herstellung eines elastomeren Neutronenschutzmateriales

Publications (3)

Publication Number Publication Date
EP0242227A2 EP0242227A2 (en) 1987-10-21
EP0242227A3 EP0242227A3 (en) 1988-10-05
EP0242227B1 true EP0242227B1 (en) 1993-02-10

Family

ID=6298902

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87303420A Expired - Lifetime EP0242227B1 (en) 1986-04-17 1987-04-16 Elastomeric neutron protection material

Country Status (4)

Country Link
EP (1) EP0242227B1 (ja)
JP (1) JPS6324197A (ja)
DE (1) DE3612971C2 (ja)
IL (1) IL82227A0 (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4938233A (en) * 1987-08-03 1990-07-03 Techton, Inc. Radiation shield
DE4131274C2 (de) * 1991-09-20 1995-05-11 Braas Gmbh Neutronenabsorbierende Kunststoffbahn
US6373066B1 (en) * 1999-08-20 2002-04-16 Saint-Gobain Industrial Ceramics, Inc. Thermal neutron detector using a scintillator with background gamma ray shielding
DE102005057428B3 (de) * 2005-11-30 2007-08-16 Krebs Beschichtungssysteme Gmbh Strahlenresistentes und -abschirmendes Beschichtungssystem und Verfahren seiner Auftragung auf Bauteile und Bauwerke
FR2961940B1 (fr) * 2010-06-28 2016-07-29 Constructions Ind De La Mediterranee Cnim Materiau de blindage neutronique, dispositif de stockage et de transport de produits radioactifs et procede de fabrication
JP6757317B2 (ja) 2014-10-16 2020-09-16 クィーンズ ユニバーシティー アット キングストン 汚れ防止および落書き防止組成物
CN112759735A (zh) * 2021-01-15 2021-05-07 中国工程物理研究院材料研究所 一种聚氨酯基吸氢材料及其制备方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4187215A (en) * 1972-09-25 1980-02-05 Aerojet-General Corporation Polymeric isocyanate-hydroxy terminated polybutadiene compositions
JPS5232996A (en) * 1975-09-09 1977-03-12 Bridgestone Corp Process for preparing polyurethanes based on polydienes
US4072702A (en) * 1976-12-06 1978-02-07 The United States Of America As Represented By The Secretary Of The Army Tri-functional isocyanate crosslinking agents for hydroxy-terminated polybutadiene binders
DE3018548A1 (de) * 1980-05-14 1981-11-19 Wacker-Chemie GmbH, 8000 München Zu elastischem strahlenschutzmaterial vernetzbare massen und elastomere aus solchen massen
FR2534058B1 (fr) * 1982-10-04 1988-10-07 Guibert Jacques Revetement projetable antineutronique
DE3238831A1 (de) * 1982-10-20 1984-04-26 Walter Ing.(grad.) 6990 Bad Mergentheim Ries Neutronenschutzmaterial und neutronenschutzvorrichtungen aus solchem material

Also Published As

Publication number Publication date
DE3612971C2 (de) 1997-09-18
EP0242227A3 (en) 1988-10-05
DE3612971A1 (de) 1987-12-23
EP0242227A2 (en) 1987-10-21
JPS6324197A (ja) 1988-02-01
IL82227A0 (en) 1987-10-30

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