Space radiation shielding material

FIELD: shielding against ionizing rays.

SUBSTANCE: proposed material has sublayer in the form of polybutyl titanate solution or solution of heteroorganic compounds and coating layer of material using silicone polymer as matrix. Coating layer also uses powders of heavy metals, their oxides and carbides as inorganic filler, and cross-linking agent based on mixture of orthosilicic acid ether and products of its hydrolysis. In addition, it has process cross-linking agent in the form of amorphous pyrogenetic silicon dioxide, and curing agent in the form of tin diethyl dicaprylate or catalyst in the form of amino silane solution in orthosilicic acid. Coating layer has following proportion of ingredients, mass percent: silicone polymer, 8.2 - 37.1; heavy-metal powders, their oxides and carbides, 60.7 - 92.0; cross-linking agent, 0.2 - 0.5; process cross-linking agent, 0.2 - 0.5.

EFFECT: enhanced physical, mechanical, and shielding properties of material.

1 cl, 1 dwg, 1 tbl

 

The invention relates to materials for protection from radiation and cosmic radiation.

Known composition for protection against radiation (RF patent No. 2105363) of the following composition (wt.%):

Liquid glass54,3-57,1
The modifying additive is a silicone0,7-1,0
liquid 136-41
Hardener - ferrochrome slag14.4V-23,9
Filler - waste ground optical glass18,6-30,0
containing Na2O, K2O, Al2O3, PbO, SiO2,
thus, the amount of PbO is 70,93 wt.%

The disadvantage of this arrangement is the need for high temperature processing and high stability (fragility).

The closest material to the claimed invention is a material to neutralize the pathogenic effects of radiation, as described in the patent of Russian Federation №2138933 (prototype). The material has two layers. One layer is made in the form of a fabric containing synthetic yarn or fiber. The material also contains a layer made of Nickel with the inclusion of at least one metal.

The disadvantage of this material is ut the th temperature range (from -30° C to +180°C), low strength and low processability of the composition.

Object of the invention is the improvement of physico-mechanical and protective properties of the material, extended temperature range operation (from minus 130°C to +250° (C) while maintaining the elasticity, improving manufacturability (possibility of application to protected parts of any shape and size staple, carpal methods or in the form of sheets, molded blanks), with cure without heating.

The technical result of the invention lies in the fact that the proposed composition has high processability, heat resistance, elasticity, cures without heat, is applied on a protected surface spitalny or brush method, has a high protective properties, allows you to create a coating with conductive properties (for removing electrostatic charge from the surface of the protected devices) or, on the contrary, with dielectric properties.

The technical result is achieved due to the fact that the material for protection from space radiation includes a coating layer of a material containing a matrix and inorganic filler. When this material for protection from space radiation contains sublayer in the form of a solution of polybutylene or solution of Organoelement compounds and the layer on which rite of material, contains as a matrix of silicone polymer. As the inorganic filler material contains powders of heavy metals, their oxides and carbides. The material also includes a structure forming agent based on a mixture of ester of orthosilicic acid and products of its hydrolysis, process structuring agent in the form of biogeneticists amorphous silica, vulcanizing agent in the form of determinability tin or the catalyst in the form of a solution of aminosilane in the esters of orthosilicic acid in the following ratio, wt.%:

organosilicon polymer8,2-37,1
powders of heavy metals, their oxides and carbides60,7-92,0
structuring agent0,2-0,5
technological structuring agent0,2-0,5
vulcanizing agent in the form of determinability tin or
the catalyst in the form of a solution of aminosilane in the ethers
orthosilicic acid0,9-1,2

The drawing shows the structure of a material for protection from space radiation.

The drawing shows a: polymer matrix 1; particles biogeneticists amorphous dio is sid silicon 2; the particles of the filler 3; sublayer 4; the surface of the protected device 5.

The application of the powder filler of the specified particle size distribution (particle size from 0.1 μm to 70 μm) provides the desired degree of filling material and, as a consequence, the desired value of the surface density of the coating provides a protective (absorbing) properties of the coating. Application of powder heavy metal (e.g. tungsten) allows for a certain degree of filling to obtain a coating with conductive properties. Applying a powder of oxide or carbide heavy metal causes the dielectric properties of the coating.

Use as a matrix of organosilicon compounds in combination with the vulcanizing agent in the form of determinability tin or a catalyst in the form of a solution of polymethylsilane allows you to increase the resistance of the material to temperature (from minus 130°C to +250° (C) and provides a cured silicone matrix and compositions based on it without heating. The use of ethyl silicate, which are a mixture of ether articlenews acid and products of its hydrolysis with different contents of tetraethoxysilane, improves the quality of the structure of the polymer matrix to increase the strength of the material and to reduce the mass loss (ablation substances) by heating the mother of the La. Application biogeneticists amorphous silicon dioxide improves the processability of the composition, prevents delamination of the components in the coating layer, eliminates smudges and heterogeneity of the coating. The solution is polybutylene (sublayer a-9) or a solution of Organoelement compounds (type P-11) as a sublayer allows to obtain a high adhesive bonding strength of the coating to the surface of the protected device.

Technology of preparation of the composition includes the following operations.

Powder filler as a filler can be used a powder of tungsten or oxide) by prosave on a sieve with a mesh size of 100 μm is cleared from debris and residue of coarse fractions. Preparation of silicone matrix is produced in the mixer by carefully pomeshivaya granules of the polymer in a solvent to obtain a homogeneous mass. Then enter ethyl silicate, the required amount of tungsten powder, biogeneticists amorphous silicon dioxide. The composition is mixed until a homogeneous mass within 20-30 minutes. Prepared semi-finished product is discharged into a container.

The material is prepared immediately before application to the surface of the protected device. Preparation of the surface is degreased with acetone, dried for 3-5 mi is, the underlayer coating in the form of a solution of polybutylene or solution of Organoelement compounds and subsequent drying for 40 min to 3 hours. Then applied to the surface of the finished prefabricated protective material and exposed to air for 24 hours.

Of the proposed material were made samples, which were investigated physical, mechanical properties. Specific examples of compounds and their properties are given in table. 1.

Absorbing capacity of the material under irradiation by electrons with energy of 2 MeV was 93% when the surface density of 0.93 g/cm2and 96% when the surface density of 1.08 g/cm2. With respect to the x-ray radiation coating with a surface density of 1 g/cm2provides a 10-fold attenuation of radiation with energy of 100 Kev, and the coating with a surface density of 2 g/cm2- A 10-fold attenuation of radiation with energy of 200 Kev.

Confirmed by experimental measurements, the calculation shows that the coating with a surface density of 1 g/cm2provides complete protection of electronic devices KA, which is in a geostationary orbit, from exposure to the damaging effects of magnetic storms.

Radiation resistance of a material is equivalent to the radiation dose in excess of 240 Mrad. The adhesive strength of the material up to 30 kgf/cm . Electrical resistance for "conductive" variant cover was 40 Ohms/cm2for dielectric >2 to 108Ohm/cm2. The weight of the coating material depending on the degree of filling is 4.5-7.5 g/cm3.

The advantages of the material are as follows:

proposed material allows you to create a protective coating on the housing of an electronic device, without exposing it to additional process heat;

- high processability of the composition allows to obtain coverage with stable physical properties on the details of any size and shape, to vary the properties of the obtained coating (conductive/dielectric, various surface density);

- high degree of protection is achieved when the thickness of the coating layer 1.1-2.0 mm when the surface density of the material from 0.9 to 2.0 g/cm2;

the proposed material provides a stable radiation protection facilities in the temperature range from minus 130°C to +250°in the long run (for example, instruments KA to 30 years), while the total dose irradiation can reach 240 Mrad;

the plasticity of the material provides the relaxation of mechanical stresses arising from differences in cltr of the coating material and the material of the casing;

- high edge the AI (up to 30 kgf/cm 2provides health coverage under conditions of vibration, shock loads;

- offer the most effective material for local protection of electronic devices like integrated circuits, which is especially important for KA severe restrictions on weight and size.

Table 1
MATERIAL FOR PROTECTION FROM SPACE RADIATION
No. sample12
Material powder fillerWolframWolfram
The particle size of the powder fillerd<70 micronsdcp˜25 µm
Material composition, wt.%:
rubber SCTN1638,2
structuring agent (ethyl silicate)0,30,2
technological structuring agent (paragenetically amorphous silicon dioxide)0,50,2
vulcanizing agent (solution of polymethylsilane)1,20,8
filler81,790,6
Characteristics of the coating material:
Density, g/sup> 3of 4.667,45
The thickness of the coating layer, mm2,01,45
Absorption capacity under irradiation by electrons with energy of 2 MeV, %9396
Electrical resistance, Ohm/cm240>2 to 108
Adhesive strength (kgf/cm229,624,3

Material for protection from space radiation, comprising a coating layer of a material containing a matrix and an inorganic filler, characterized in that the material for protection from space radiation contains sublayer in the form of a solution of polybutylene or solution of Organoelement compounds, and the coating layer made of a material that contains as a matrix of silicone polymer, as the inorganic filler powders of heavy metals, their oxides and carbides, structuring agent based on a mixture of ester of orthosilicic acid and products of its hydrolysis, process structuring agent in the form of biogeneticists amorphous silica, vulcanizing agent in the form of determinability tin or the catalyst in the form of a solution aminosilane in the esters of orthosilicic acid in the following ratio, wt.%:

Organosilicon polymer8,2-37,1
Powders of heavy metals, their oxides and carbides60,7-92,0
Structuring agent0,2-0,5
Technological structuring agent0,2-0,5
Vulcanizing agent in the form of determinability tin or
the catalyst in the form of a solution of aminosilane in the ethers
orthosilicic acidis 0.9-1.2.



 

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FIELD: shielding against ionizing rays.

SUBSTANCE: proposed material has sublayer in the form of polybutyl titanate solution or solution of heteroorganic compounds and coating layer of material using silicone polymer as matrix. Coating layer also uses powders of heavy metals, their oxides and carbides as inorganic filler, and cross-linking agent based on mixture of orthosilicic acid ether and products of its hydrolysis. In addition, it has process cross-linking agent in the form of amorphous pyrogenetic silicon dioxide, and curing agent in the form of tin diethyl dicaprylate or catalyst in the form of amino silane solution in orthosilicic acid. Coating layer has following proportion of ingredients, mass percent: silicone polymer, 8.2 - 37.1; heavy-metal powders, their oxides and carbides, 60.7 - 92.0; cross-linking agent, 0.2 - 0.5; process cross-linking agent, 0.2 - 0.5.

EFFECT: enhanced physical, mechanical, and shielding properties of material.

1 cl, 1 dwg, 1 tbl

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1 cl, 1 tbl, 1 ex

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3 tbl

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