DE1414681A1 - Boron-containing neutron absorbing material - Google Patents

Description

neutron absorbing material

It is known that boron has nutritional properties has and that sioh compounds like borearbide and. Boron oxide al such · or old other substances veraiaoht »λ * against neutrons abeohirmeiidee material. Furthermore, it is known that waeeeetofihaltJLge plaatieohe utoffe »like beiepieleveiee polyethylene and paraffin changes, good neutron displays and sub breathes for fast neutrons can be detected, so that their velocity is in a "range" de »Bor seine beaten absorbent Sigeneoh * Xtex \ aufwelat«

For the purpose of abandoning the secondary Saama system the suletst mentioned btof. and the increase in their ability to absorb for Wäraeoeutronea Toreeeanlafien, si · «it powdered boron oxide or boron carbide su rermieohen. Boron oxide If Jedooh su this »purpose not dividing» 4a te is hygroakopiaoh and the% tvioklung of Gxisbla * oh * n in that old boron oxide with equilateral Srwanaung su Tereischenden material, for example in polyethylene. Boron carbide does not have this power, if Jedooh is an "iealioh." expensive material. Hinsu states that both boron carbide and auoh

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Boron oxide, since mi · in front »« are mixed into ·· powder bus * • ent ·· * »" eohwer are distributed uniformly in the material »u, and because their grain size increases the homogeneity of the mixture It is also difficult to ensure that the finished material does not give off any boron carbide on its surface.

It has now been found that the above-discussed deficiencies are reflected in the use of a neutron-ana-absorbing material Finding which one or more boric acid meters fatty alcohols with nine or "more carbon atoms" or contains this, can be eliminated »These eater selgex the for a shaping desired plastic sigenaohaften or they can be dissolved in suitable plastic materials such as, for example, paraffin wax or polyethylene. fferaer has the group of fatty alcohols brassende properties, As are comparable to those of faraffinwaohs.

Ha Cetyl, Hyrietjrl- and stearyl alcohol as well as commercially available Mixtures of such fettalkoholc are particularly cheap and with Boric acid can easily be brought to a reaction, is inventively derived from the ketaboric acid esters of this alcohol Existing material containing odor sis will prevent you Metsbors & urecster weighed their higher borrowing levels Orthoboric acid esters pre-sucked. Ba te without stearyl alcohol Not only special is cheap, but also a metaboric acid ester la fot »a plastic ubstans old matching Bigene-like and suitable · boron content forms «is invented. geaftl versugswelse a from dleeea metaboric acid tearyl ester

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existing material

iiaoli of an embodiment of the invention contains the neutron " absorbent material with an · «organic plastic

mingled

Material / boric acid ester * where the former is old the boric acid ester

A liquid can form »A good meow is then suitable» if the boric acid ester is liquid or has unstable plastic properties. Furthermore, the ksum ά * τ üorgehalt of such a mixture can be easily regulated

Suitable plactia-like substances include paraffin waxes and waxes in particular polyethylene. The halls with paraffin waoha and wax easy to shape by pouring »during the Mixtures of old polyethylene also have the advantage of fabric and easy machinability from the metaboric acid esters of technical stearyl alcohols with polyethylene,

The boron-containing neutron absorbing iitoffei according to the invention are also used as a material for protection against heutrons and suitable for the control of heutron radiation.

In the example below, the recovery of some is more boron-containing Illustrates neutron absorbing materials according to the invention.

Beieole ^.

1 kg of technical stceryl alcohol is In «Ine» with a »den Bottom ventilated clockwork provided vessel gesohoolien.

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Tollatttndlgea Sohaelsen, 261 g t of powdered boric acid in two to three servings are made. Pi · Hiaofaiing koaat at 150 - 160 ° C under ^ Texker Caaentwloklung «ur Beak ·» and results after its termination «in · clear · aolm« l> ·. The boric acid overflow is converted into% ra «rfr« l · boric acid which is used in the vessel wall. When the öoheelee cools down, the metaboreic acid atearyl ester is obtained in the form of a white plaetieohen üubstans, öcheela point 50 ° C.

The heave takes place aaoh the aieiohungt

> O ₁₈ H ₅₇ OBO + 2 H ₂ O.

B - 3.66 t jC 0 »10 | 82 | ? t stearyl grape «85» 80 The following connections have been replaced in the same way

Netaboraäureeeter de Oet / lalkohol «, feet, ßehaela point 43 ° β (5β ° C)) (B «4 # t7

Metabor »äureeeter de · Hrriatylalkohol»,

feet, öoh »el« point 51 <> 0 Jt B «4.5

Metaboric acideeter dee oleyl alcohols,

flUl + B «3.66

There is a tendency towards the fact that the metaboric acid ethers obtained are old Species like paraffin and other vaeaaen soi · anoh al * I ^ laritnylen rollaUndig aie «kaar aind. Jedooh aind "1" alt Fol / ejalden der K / lenart, Polyetyrol, Polyrinjlonlorid und AlkjrdÄarsen aioht aiaohear.

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50 kg of boric acid ester of tearyl alcohol were placed in a long gripper «In ·· Heutronic spectrographs g« goB * «n and showed those who shared satisfaction Abaohiramigeeiiienaofaaf t en.

$ 0 kg of hetaboraic acid dee btearyl alcohol and 30 kg of polyethylene were obtained by 2uaajtBeheohaelien with stirring. When the ciuielae were poured into flat blocks you 20 kg% mr4 · «in ·« rice · relatively hard oil, which was obtained in · fetlfe has and eioh comfortably nit d ·? Machining with the lathe according to · Aub den Blöoken were small · «· Blocks h« rough «aftgt» which see below »Insertion into Keutroeeneohutewände in Xernreaictorswiechenwftnden were suitable *

A Hydrolyae τοη Hetaboreäureeeter in a several zag «la Vaaaer thawed little blook was not verified.

Im - $ 12 (3rd

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Claims (1)

Claims t 1 · Contains boron · »Neutronenabsorbicrendos Materiel, thereby g · - kamAStlohn ·), Aal ea au * mlntm οά · τ aebreren Boreäuureeetern VfM nine ο4 · γ athr rohlwjwaaaeretoXfato consists« · «ntJialt contains« Ad «n?« Ttalkeeen. 2. Existing neutroneaorbiereudee material n »oh Anapruoh 1, due to the fact that it consists of one or more alcoholic alcohols consisting of cetyl-, yrietyl-VBdotearylalkehol and the commercial mixtures existing yettalkeholgrutp · or the contains. 3. boric ·· neutroacaaesortlereades material according to claim _{9 v} I characterized it dal aas Metaborsäureester τοη teehnleohea Stearylalkohul "eateht · 4 «!» Rhalti «·· neutron-absorbing material naoh Anapruoh 1« ad 2 «thereby kean * eioh« «t _t daJ ·· dan Boraäureeeter old · 4η« · ι organiaehen plastic material Temisoht reveals »from last« r · « With the AorsAureeeter a solution • lld · «came · 80980 2/0177 1 —Ii ivv » 4 « ?, Borhaltigea aeutroneoabaorbierejidea Katsrial according to claim 4t because the plastic material is paraffin wax or wax. 6. Boron-containing neutronenaboorbarenöoe ftateri & l ηκoh claim 4 t thereby known refuses t that daa piaetieoiie material polyethylene is. 7. Boron-containing neutrontnabeorbating material according to specification 6, characterized by the fact that 88 comes from a definition of the Hetaboraäuxe98tere dee stearyl alcohol with polyethylene consists. Ea - 12 563 80S802 / 0 177