CN102214490A - Neutron shielding material and manufacturing method thereof - Google Patents

Neutron shielding material and manufacturing method thereof Download PDF

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Publication number
CN102214490A
CN102214490A CN2011101057357A CN201110105735A CN102214490A CN 102214490 A CN102214490 A CN 102214490A CN 2011101057357 A CN2011101057357 A CN 2011101057357A CN 201110105735 A CN201110105735 A CN 201110105735A CN 102214490 A CN102214490 A CN 102214490A
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sodium
water glass
borax
neutron
parts
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CN102214490B (en
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李航
邹宇斌
温伟伟
王胜
唐国有
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Peking University
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Peking University
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Abstract

The invention discloses a neutron shielding material and a manufacturing method thereof, belonging to the field of neutron shielding. The neutron shielding material provided by the invention comprises sodium borate, sodium silicate and sodium fluosilicate, wherein the proportion by weight parts of the sodium borate, the sodium silicate and the sodium fluosilicate is 100:m:n, the value of m is 50-70, and the value of n is 5-15. The method provided by the invention comprises the following steps of: 1) taking predetermined parts of sodium borate, sodium silicate and sodium fluosilicate, wherein the proportion by weight parts of sodium borate, sodium silicate and sodium fluosilicate is 100:m:n, the value of m is 50-70, and the value of n is 5-15; 2) adding water to dilute the sodium silicate, then, adding the diluted sodium silicate into the mixture of the sodium borate and the sodium fluosilicate, and mixing uniformly; and 3) adding the uniformly mixed mixture into a press mould, performing extrusion molding, and then demoulding. The material provided by the invention is excellent in neutron shielding capability, controllable in moulding speed, simple in technology and low in cost, and has certain mechanical strength.

Description

A kind of neutron shielding material and preparation method thereof
Technical field
The invention belongs to the NEUTRON PROTECTION field, relate to a kind of neutron shielding material and preparation method thereof, can distinguish neutron shield at wide from the fast neutron to the thermal neutron.
Background technology
Neutron is one of nucleon of composed atom nuclear, and neutral is not subjected to the atom electric field effects when taking place to interact with material, and directly and atomic nucleus interact, have stronger penetrability so it is compared with X ray, gamma-rays.Neutron all has enormous function at aspects such as nuclear energy, nuclear weapon, material flaw detection, well logging, activation analyses, all occupies an important position in national defence, commercial production.But because the strong penetrability of neutron makes it produce very strong radiation damage to human body, environment, instrument and equipment etc., the operate as normal of life-threatening safety and instrument is to make neutron normally be human necessary means of serving so neutron is shielded well.
Shielding to neutron is generally extremely more low-yield by light element slowing down fast neutron, re-uses materials such as boron, lithium, cadmium and absorbs, and lowers the purpose of the outer neutron dose of shield to security level to reach.Traditional neutron shielding material comprise contain boron polyethylene (list of references: Zhu Guangning etc. Xi'an pulsed reactor neutron photography shield. the atomic energy science technology, Vol.40, No.5sep.2006), boron containing cement, tungalloy (list of references: Wu Wensheng. Neutron shielding study of neutron-photon logging tool. nuclear electronics and Detection Techniques, Vol.24, No.1 Jan.2004) etc., newly developed as hydroboration zirconium (Zr (BH4) 4) and zircoium hydride (ZrH2) (list of references: T.Hayashi, Journal of Nuclear Materials 386-388 (2009) 119-121) etc., these materials have shield effectiveness preferably to neutron, but have the cost height, shaping speed is slow, problems such as complex process.Along with the neutron application and development, different occasions have proposed different requirements to neutron shielding material.
Summary of the invention
The purpose of this invention is to provide a kind of neutron shielding material and preparation method thereof, be primarily aimed at compact accelerator neutron source, isotope neutron source etc.; Integrated cost and shield effectiveness, the present invention can play good supplementary function to existing neutron shielding material, traditional shielding material process-cycle is longer, the present invention since faster shaping speed can tackle emergency case, as the shutoff in early stage of nuclear leakage; At the shielding material volume is not under the situation of major consideration, and the present invention can be used as the poly substitute of boracic, reduces the shielding cost greatly; The present invention provides the preparation method of this shielding material simultaneously.
Technical scheme of the present invention is:
A kind of neutron shielding material is characterized in that comprising borax, water glass, sodium fluosilicate; Wherein, the proportioning of the parts by weight of described borax, water glass, sodium fluosilicate is 100: m: n; The m value is 50~70, and the n value is 5~15.
A kind of method for making of neutron shielding material the steps include:
1) gets setting umber borax, sodium fluosilicate potpourri and water glass; Wherein, the proportioning of the parts by weight of described borax, water glass, sodium fluosilicate is 100: m: n; The m value is 50~70, and the n value is 5~15;
2), join in borax and the sodium fluosilicate potpourri and stir with behind the water glass thin up;
3) potpourri that stirs is added in the compacting tool set demoulding after the extrusion modling.
Further, described water glass and water dilute according to the proportioning of 1: 10~1: 15 parts by weight.
Further, described water glass and water dilute according to the proportioning of 1: 10 parts by weight.
Further, the proportioning of the parts by weight of described borax, water glass, sodium fluosilicate is 100: 60: 6.
The present invention is directed to the feature of neutron, should be rich in neutron moderator and absorbing agent in the shielding material, so material of the present invention comprises borax, water glass and small amount of fluorine sodium silicate hardening agent.Described shielding material be borax, water glass, sodium fluosilicate according to 100: the proportioning of the parts by weight of m: n is mixed, wherein the umber of water glass is adjustable to 70 parts at 50 parts, umber is few more, adhesive power is poor more, bad mechanical strength, on the contrary adhesive power is strong more, and physical strength is big, but the borax relative content descends, and influences thermal neutron and absorbs; The umber of hardening agent can be adjusted at 5 to 15 parts, influences the shaping speed of material.Borax and water glass are chemical industry and building materials commonly used, wide material sources, and cost is low, and is easy and simple to handle.Select the proportioning of water glass and hardening agent during use as required, suitably improve the umber of water glass and hardening agent for the high occasion of requirement of mechanical strength.Contain bulk crystallization water and free water in the moulding material, fast neutron is had preferably slowing down power(SDP), and (borax is Na 2B 4O 710H 2O contains a large amount of water of crystallization; Water glass solidifies provides free water and partially crystallizable water, and the protium in borax and the water glass can both play good slowing down effect to fast neutron); Boron element in the borax has extremely strong receptivity to the thermal neutron after slowing down.Material of the present invention slightly is inferior to the shielding of neutron and contains boron polyethylene, but all has superiority than containing boron polyethylene on price and difficulty of processing.
Compared with prior art, good effect of the present invention is:
Usefulness of the present invention is that the material that is provided has neutron shield ability preferably, and certain mechanical strength is arranged, and shaping speed is controlled within the specific limits with curing dose, and technology is simple, and is with low cost.
By the fast neutron imaging mode material of being invented has been carried out the neutron shield aptitude tests, contrast material be 1 centimetre of thickness contain boron polyethylene, epoxy resin borax potpourri 1 (mass ratio is 35: 100), epoxy resin borax potpourri 2 (mass ratio is 40: 100) and material of the present invention (borax, water glass, hardening agent mass ratio are 100: 60: 6); Accompanying drawing 1 is the shielding result signals of four kinds of materials of 1cm thickness to neutron, and transverse axis is a material, and the longitudinal axis is screening ability (with the poly screening ability of boracic is 1, carries out normalized).
Description of drawings
Fig. 1 is the shielding result signals of four kinds of materials of 1cm thickness to neutron;
Fig. 2 is a method for making process flow diagram of the present invention.
Embodiment
As shown in Figure 2, be the method for making of shielding material of the present invention:
Embodiment one
1 gets borax and sodium fluosilicate potpourri according to 100: 50 umber mixes; Wherein, the proportioning of the parts by weight of borax, water glass, sodium fluosilicate is 100: 50: 5;
2 with the water glass thin up, and the ratio of water is 1/10th to 1/15th of a water glass quality.Bigger water ratio is beneficial to stirring, but can reduce bond properties, and the dilution ratio of selecting 1: 10 is more excellent equilibrium point.
3 water glass after will diluting slowly add borax and sodium fluosilicate potpourri, and stir rapidly.
4 with in the potpourri adding compacting tool set that stirs, and extrusion modling is used after the demoulding.
Described shielding material preliminary setting time is 5-30 minute (different with curing dose), and about 6-24 of full solidification time hour, solidification temperature was a room temperature.
Embodiment two
1 gets borax and sodium fluosilicate potpourri according to 100: 60 umber mixes; Wherein, the proportioning of the parts by weight of borax, water glass, sodium fluosilicate is 100: 60: 6;
2 with the water glass thin up, and the ratio of water is 1/12nd of a water glass quality.Bigger water ratio is beneficial to stirring, but can reduce bond properties.
3 water glass after will diluting slowly add borax and sodium fluosilicate potpourri, and stir rapidly.
4 with in the potpourri adding compacting tool set that stirs, and extrusion modling is used after the demoulding.
Described shielding material preliminary setting time is 5-30 minute (different with curing dose), and about 6-24 of full solidification time hour, solidification temperature was a room temperature.
Embodiment three
1 gets borax and sodium fluosilicate potpourri according to 100: 70 umber mixes; Wherein, the proportioning of the parts by weight of borax, water glass, sodium fluosilicate is 100: 70: 15;
2 with the water glass thin up, and the ratio of water is 1/15th of a water glass quality.
3 water glass after will diluting slowly add borax and sodium fluosilicate potpourri, and stir rapidly.
4 with in the potpourri adding compacting tool set that stirs, and extrusion modling is used after the demoulding.
Described shielding material preliminary setting time is 5-30 minute (different with curing dose), and about 6-24 of full solidification time hour, solidification temperature was a room temperature.

Claims (8)

1. a neutron shielding material is characterized in that comprising borax, water glass, sodium fluosilicate; Wherein, the proportioning of the parts by weight of described borax, water glass, sodium fluosilicate is 100: m: n; The m value is 50~70, and the n value is 5~15.
2. neutron shielding material as claimed in claim 1 is characterized in that described water glass and water dilute according to the proportioning of 1: 10~1: 15 parts by weight.
3. neutron shielding material as claimed in claim 2 is characterized in that described water glass and water dilute according to the proportioning of 1: 10 parts by weight.
4. as claim 1 or 2 or 3 described neutron shielding materials, the proportioning that it is characterized in that the parts by weight of described borax, water glass, sodium fluosilicate is 100: 60: 6.
5. the method for making of a neutron shielding material the steps include:
1) gets setting umber borax, sodium fluosilicate potpourri and water glass; Wherein, the proportioning of the parts by weight of described borax, water glass, sodium fluosilicate is 100: m: n; The m value is 50~70, and the n value is 5~15;
2), join in borax and the sodium fluosilicate potpourri and stir with behind the water glass thin up;
3) potpourri that stirs is added in the compacting tool set demoulding after the extrusion modling.
6. method as claimed in claim 5 is characterized in that described water glass and water dilute according to the proportioning of 1: 10~1: 15 parts by weight.
7. method as claimed in claim 6 is characterized in that described water glass and water dilute according to the proportioning of 1: 10 parts by weight.
8. as claim 5 or 6 or 7 described methods, the proportioning that it is characterized in that the parts by weight of described borax, water glass, sodium fluosilicate is 100: 60: 6.
CN 201110105735 2011-04-26 2011-04-26 Neutron shielding material and manufacturing method thereof Expired - Fee Related CN102214490B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107240428A (en) * 2017-07-27 2017-10-10 深圳爱索特工业器材有限公司 A kind of robot shielding and its application method
CN113307601A (en) * 2021-06-08 2021-08-27 宋渊 Lead-free silicon-based ionizing radiation shielding material and manufacturing method and application thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4727257A (en) * 1986-01-22 1988-02-23 Sergio Grifoni Shield against radiations
US20040127599A1 (en) * 2002-10-25 2004-07-01 Pascale Abadie Meterial for neutron shielding and for maintaining sub-criticality, process for its preparation and its applications
US20060074141A1 (en) * 2004-10-06 2006-04-06 Tri-E Shielding Technologies, Llc Techniques and compositions for shielding radioactive energy
CN101302367A (en) * 2008-07-10 2008-11-12 北京富迪创业科技有限公司 Anti-neutron size putty
CN101430941A (en) * 2008-12-22 2009-05-13 中国核动力研究设计院 Flexible compound radiation shielding material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4727257A (en) * 1986-01-22 1988-02-23 Sergio Grifoni Shield against radiations
US20040127599A1 (en) * 2002-10-25 2004-07-01 Pascale Abadie Meterial for neutron shielding and for maintaining sub-criticality, process for its preparation and its applications
US20060074141A1 (en) * 2004-10-06 2006-04-06 Tri-E Shielding Technologies, Llc Techniques and compositions for shielding radioactive energy
CN101302367A (en) * 2008-07-10 2008-11-12 北京富迪创业科技有限公司 Anti-neutron size putty
CN101430941A (en) * 2008-12-22 2009-05-13 中国核动力研究设计院 Flexible compound radiation shielding material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107240428A (en) * 2017-07-27 2017-10-10 深圳爱索特工业器材有限公司 A kind of robot shielding and its application method
CN113307601A (en) * 2021-06-08 2021-08-27 宋渊 Lead-free silicon-based ionizing radiation shielding material and manufacturing method and application thereof

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