RU113058U1 - SCREEN FOR PROTECTION AGAINST RADIATION RADIATION - Google Patents

Abstract

A screen for protection against radiation radiation, made in the form of a plate having at least two layers connected to each other, one of which has an adhesive property, and the other performs a protection function, characterized in that the layer of the plate performing the protection function is created made of a polymer composition including a polymer binder, a plasticizer screening a powdery filler, and a layer with a sticky property is made of a polymer composition including a polymer binder, a plasticizer, a screening powdery filler, thixotropic and adhesive additives, providing additional protective properties, moreover, a mixture of polymers made of butyl rubber and / or ethylene-propylene rubber and / or sevilen is used as a polymer binder, mineral oil is used as a plasticizer, barite is used as a shielding powder filler, or lead powder, or tungsten, as a thixotropic additive is A complex compound of silicon dioxide is used, and aliphatic resins are used as an adhesive additive, while the layers have a thickness of 2 mm to 9 mm, and the ratio of the thicknesses of the layer with an adhesive property and the layer performing the function of protection is from 1 / 0.5 to 1 / 2.

Description

The utility model relates to the field of radiation protective shields and can be used as protection of premises, technological equipment and engineering structures from radiation in industry.

Currently, the urgent task is to create elastic materials and protective screens based on them to protect rooms, equipment, engineering structures and personnel from radioactive radiation.

Given the actual operating conditions, the basic requirements for the radiation protection element are as follows:

rather high content of chemical elements with large serial numbers;

increased flexibility;

steady durability;

wide temperature range of operation;

the possibility of fastening in any spatial position;

the constancy of protective properties and physico-mechanical characteristics, both on the surface of the material and in time;

manufacturability in use.

Traditionally, the premises were protected from penetrating radiation using barite plaster. When using barite-concrete and magnesia-barite plaster [1], to ensure proper radiation safety of the premises, a very significant thickness of the radiation-protective layer is required, which is applied in several steps with mesh reinforcement. Thick layers of barite plaster are unstable with respect to vibration and deformation loads, which leads to the formation of cracks (slopes, doorways, corners). This affects the protective properties of the barite layer and affects the quality of the decorative decoration.

Known radiation protective products (screens) in the form of puff materials.

The use of multilayer structures made of lead foil is unreliable due to the lack of reliable and durable connection of sheets to each other. A known screen, which is a structure consisting of glued sheets of lead drywall and sheet lead. Website www.med-x-ray.ru [2] The disadvantage of this design is the high cost, the complexity of installing and attaching the protective material on complex curved surfaces, technological equipment, engineering structures.

A known solution is described in utility model No. 95888 of March 30, 2010. [3] A portable radiation shielding screen includes a radiation shielding part (RPS), inside which is enclosed a radiation absorbing material consisting of 92 wt.% Tungsten powder as a filler and 8% wt. silicone as a matrix, RZCh is placed in a polymer protective shell and a reinforcing mesh is included in it.

The disadvantages of this analogue include the high cost, the complexity of installing and attaching the protective material on complex curved surfaces, technological equipment, engineering structures, the need for durable fastening of the protective material inside the outer shell, preventing tearing and folding of the protective material inside the protective shell.

The closest technical solution is the device described in utility model No. 83963 publ. June 27, 2009 [4]

This device for protection against energy influences consists of a layer of schungite-containing material bonded through an adhesive layer with aluminum foil, while the schungite-containing layer is made on the basis of synthetic rubber and has a thickness of 1.0-1.5 mm, and aluminum foil has a thickness of 0, 2-0.4 mm. An adhesive layer is applied to the free side of the schungite-containing layer.

The disadvantage of this device is its insignificant protection against radiation, low yield strength on a vertical surface, and low technological adaptability in use.

The objective of the utility model is the creation of a self-adhesive radiation-protective water-gas-tight screen with high radiation-protective, adhesive properties, flow resistance on a vertical surface and high adaptability to use.

The technical result from the use of the utility model is to create a screen with high radiation-protective, adhesive properties, flow resistance on a vertical surface and high adaptability to use. The technical result is achieved due to the fact that the layer of the plate that performs the protection function is created from a polymer composition that includes a polymer binder, a plasticizer that screens the powdery filler, and the layer having an adhesive property is created from a polymer composition that includes a polymer binder, a plasticizer, a shielding powder filler, a thixotropic and adhesive additives, providing additional protective properties, moreover, a mixture of imeters from butyl rubber and / or ethylene propylene rubber and / or sevilen, mineral oil is used as a plasticizer, barite or lead powder or tungsten is used as a screening powder filler, a complex compound of silicon dioxide is used as a thixotropic additive, and as an adhesive additive aliphatic resins are used, and the layers have a thickness of 2 mm to 9 mm, and the ratio of the thicknesses of the layer with an adhesive property and the layer that performs the protection function is from 1 / 0.5 about 1/2.

Figure 1 shows the design of the shield for radiation protection, consisting of two layers, one of which has the adhesive property of pos.2, it also performs the protection function, and the other layer pos.1 performs the protection function;

Figure 2 shows the design of the shield for radiation protection, consisting of alternating layers, one of which has the adhesive property of pos.2, it also performs the function of protection, and the other layer pos.1 performs the function of protection, arranged sequentially one after another.

The shield for radiation protection, made in the form of a plate having at least two layers interconnected, one of which has the adhesive property of pos.2, and the other performs the protection function of pos.1. The layer of the plate, which performs the function of protection, item 1, is created from a polymer composition including a polymer binder, a plasticizer, a screening powder filler. A layer having an adhesive property is created from a polymer composition including a polymeric binder, a plasticizer, a shielding powder filler, a thixotropic and adhesive additive, providing additional protective properties, moreover, a mixture of polymers from butyl rubber and / or ethylene-propylene rubber is used as a polymeric binder, and / or sevilen, mineral oil is used as a plasticizer, barite or lead pore is used as a screening powder filler ok or tungsten, a complex compound of silicon dioxide is used as a thixotropic additive, and aliphatic resins are used as an adhesive additive, while the layers have a thickness of 2 mm to 9 mm, and the ratio of the thicknesses of the layer with an adhesive property and the layer that performs the protection function is from 1 / 0.5 to 1/2.

A feature of this screen is that the proposed polymer composition, from which the layer with the adhesive property is made, in addition to its purpose for fixing the screen, it also performs a protective function from radiation. Thus, using the proposed composition, we achieve a double result: the plate layer, which has an adhesive property, allows you to mount the screen on the surface to be protected and increases the protection against radiation.

The thickness of the radiation shield, depending on the required lead equivalent, is presented in the table.

Table No. p / p Preset Lead Equivalent Thickness of radiation-protective baritone-filled screen, mm Thickness of radiation-protective lead-filled screen, mm one Pback 0.5 mm 4,5 2.5

2 Pbeq = 1 mm 9 5 3 Pbeq = 2 mm eighteen 10 four Pbeq = 3 mm 27 fifteen

The screen for radiation protection has high radiation-protective, water-gas-tight, anti-corrosion and physicomechanical properties in a wide temperature range of application from minus 40 ° С to plus 80 ° С, has flexibility and a high level of manufacturability, as in the manufacture of products on based on self-adhesive modification, and when using products as a protective material, gives a significant gain in cost, terms of work to protect the premises, technological equipment and engineering structures radiation from industry.

The conducted pilot tests showed the effectiveness of the proposed screen for protection from radiation, and the work on radiation protection of the premises confirmed the expected properties, namely:

- lead equivalent, mm Pb 0.5-3 mm - bond strength with concrete, MPa, not less 0.1 - bond strength with metal when peeling N / m, not less than 400 - water absorption, 24 hours,%, no more 0.2 - yield strength, 70 ° C, 24 h, mm, not more than 2

The polymer radiation-protective composition includes a polymer binder, a plasticizer, a shielding powder filler, and thixotropic and adhesive additives taken in the following ratio, wt.%, Are additionally included in the polymer composition of the plate with an adhesive property

The polymer composition for the adhesive layer Polymer composition Polymer binder 5-15 5-15 Plasticizer 10-15 5-10 Shielding filler 60-80 60-80 Adhesive additive 0.5-5 - Thixotropic supplement 5-8 -

As a polymeric binder, the radiation-protective composition contains a mixture of polymers (butyl rubber and / or ethylene-propylene rubber and / or sevilen). Mineral oil is used as a plasticizer. As a shielding powder filler, barite or lead powder or tungsten is used. A complex compound of silicon dioxide is used as a thixotropic additive. Aliphatic resins are used as an adhesive additive.

A polymer radiation-protective composition is obtained by mechanical mixing of the components in the mixer in a certain ratio.

Example 1

A mixture consisting of 5% by weight of butyl rubber, 5% by weight of ethylene propylene rubber, 10% by weight of mineral oil, 70% by weight of barite, 5% by weight of a silica compound and 5% by weight of an aliphatic resin. The properties of the composition are shown in the table.

Example 2

A mixture consisting of butyl rubber 2.5 wt.%, Ethylene propylene rubber 2.5 wt.%, Mineral oil 4.5 wt.%, 85 wt.% Barite, 5 wt.% Complex compounds of silicon dioxide and 0.5 wt. % aliphatic resin. The properties of the composition are shown in the table.

Example 3

A mixture consisting of 10% by weight of butyl rubber, 10% by weight of ethylene propylene rubber, 25% by weight of mineral oil, 45% by weight of barite, 5% by weight of a silica compound and 5% by weight of an aliphatic resin. The properties of the composition are shown in the table.

Example 4

A mixture consisting of 5% by weight of butyl rubber, 5% by weight of ethylene propylene rubber, 10% by weight of mineral oil, 75% by weight of barite, and 5% by weight of aliphatic resin. The properties of the composition are shown in the table.

Example 5

A mixture consisting of butyl rubber 7.5 wt.%, Sevilen 7.5 wt.%, Mineral oil 10 wt.%, 75 wt.% Barite. The properties of the composition are shown in the table.

Table Indicators Example one 2 3 four 5 Adhesion to concrete, MPa, not less 0.1 0.04 0.14 0.1 - Adhesion to metal, kgf / cm, not less 400 150 600 400 - Tensile strength, MPa 0.12 0.05 0.15 0.12 0.5 Lead equivalent, Pb _equiv ., Mm
- with a layer thickness of 4.5 mm
- at layer thickness 0.5 0.7 0.3 0.5 0.5

9.0 mm 1,0 1,2 0.8 1,0 1,0 Nature of destruction cohesive cohesive cohesive cohesive - Yield strength, 70 ° С, 24 h, mm, no more 2 2 2 10 2 Water absorption, 24 hours,%, no more 0.2 0.2 0.2 0.2 0.2

In the polymer composition with an increase in the content of shielding fillers and a decrease in the content of the polymeric binder, the protection indices increase, but the physical and mechanical indices (adhesion, tensile strength) are significantly reduced. With an increase in the content of the polymer binder and a decrease in the content of shielding fillers, the physicomechanical indices increase significantly, but the protection indices decrease. In the absence of thixotropic additives in the claimed polymer composition, with adhesive properties, the protection indicators and adhesive properties remain at the level, but the material does not have flow resistance from vertical surfaces. In the absence of adhesive additives in the claimed polymer composition, adhesive properties are absent, and the protection performance remains at the level.

To manufacture the screen, the resulting polymer composition is molded into plates and glued to a thickness depending on the required lead equivalent. The plates have a thickness of 2 mm to 9 mm, and the ratio of the thicknesses of the layer having an adhesive property and the protective layer in the screen is from 1 / 0.5 to 1/2. A plate with a thickness of less than 2 mm has poor protective properties, and a plate with a thickness of more than 9 mm is not technologically advanced in use due to its high weight. The ratio of the thicknesses of a layer having an adhesive property, as well as protective properties, as well as a layer having a protective property in the screen can be from 1 / 0.5 to 1/2. The shift towards increasing the thickness of the layer in the screen, which has only protective properties, is due to higher strength characteristics of the polymer composition due to the smaller amount of plasticizer in the composition, which as a result increases the manufacturability in the use of finished screens.

The screen is mounted on a protected primed concrete or metal peeled surface, including surfaces of complex configuration due to the adhesive properties of the layer and the plasto-elastic properties of layers made of a polymer composition, and if necessary (sheet thickness more than 6 mm) are mechanically fixed.

The pilot tests showed the effectiveness of the proposed radiation shielding, and the work on radiation protection of the premises confirmed the expected properties, namely:

- lead equivalent, mm Pb 0.5-3

- tensile strength, MPa

- - polymer composition with protective properties, not less than 0.5

- - polymer composition with adhesive and protective properties,

no less 0.1 - water absorption,%, 24 hours, no more 0.2 - yield strength, mm, not more than 2 - adhesion to concrete, MPa, not less 0.1 - adhesion to metal when peeling N / m, not less than 400

The indicated range of the thickness of the screen plates and the compositions of the polymer composition is optimal for use in the protection of rooms, equipment, engineering structures and personnel from radioactive radiation and provides high radiation-protective and technological properties of the screen, gives a significant gain in cost, time for installation work.

These signs distinguish the proposed technical solution from the prototype and determine the compliance of this solution with the requirements of the utility model.

Information sources:

1. Patent for invention No. 2233255 publ. 07/27/2004, "Dry building mixture."

2. Website www.med-x-ray.ru

3. Patent for utility model No. 95888 publ. 07/10/2010, "Portable radiation protective shield."

4. Patent for utility model No. 83963 publ. 06/27/2009, "Device for protection from energy influences."

Claims (1)

A shield for radiation protection, made in the form of a plate having at least two layers interconnected, one of which has an adhesive property, and the other performs a protection function, characterized in that the layer of the plate that performs the protection function is created from a polymer composition comprising a polymer binder, a plasticizer, a shielding powder filler, and a layer having an adhesive property, is created from a polymer composition including a polymer binder, a plasticizer, a screen powdery filler, thixotropic and adhesive additives, providing additional protective properties, moreover, as a polymer binder, a mixture of polymers from butyl rubber and / or ethylene propylene rubber and / or sevilen is used, mineral oil is used as a plasticizer, barite is used as a shielding powder filler or lead powder or tungsten, a complex compound of silicon dioxide is used as a thixotropic additive, and as an adhesive add Aliphatic resins are used, with the layers having a thickness of 2 mm to 9 mm, and the ratio of the thicknesses of the layer with an adhesive property and the layer performing the protection function is from 1 / 0.5 to 1/2.