Method for manufacturing laminated x-ray shielding material

FIELD: manufacture of roentgen-ray shielding materials.

SUBSTANCE: proposed method includes joining of material layers and curing to produce stack of woven and X-ray shielding material layers by mixing ingredients of cold-hardening X-ray shielding composition. X-ray shielding composition incorporates silicone rubber as binder, shielding filler made of oxide of rare-earth elements mixed up with antimony oxide (III), catalyst, polyamine, and modifying agent, proportion of ingredients per every 100 parts by weight of silicone binder being as follows: epoxy-containing hydrocarbon, 5.0 - 15.0; ortho-phthalate and monatomic alcohols, 0.5 - 3.0; rare-earth element oxides, 160 - 180; antimony oxide (III), 200 - 210; catalyst, 6.0 - 8.0; polyamine, 0.6 - 3.0. Prior to producing stack of fabric layers material is impregnated with organic solution of organometallic compound out of group of organic tin salts. X-ray shielding composition is prepared by sequential mixing up of silicone binder with modifying agent, then catalyst and hardener, followed by their mixing with filler to obtain viscous paste, then catalyst and curing agent (polyamine) which are added to viscous paste just prior to applying the latter to finished woven material. Stack obtained is subjected to compression molding and hardening.

EFFECT: facilitated manufacture.

1 cl, 1 tbl, 1 ex

 

The present invention relates to the field of technology of layered materials by compaction and can be used in the production of x-ray shielding composite materials to protect personnel radiographic installation.

A known method of manufacturing a layered x-ray shielding material, which consists in obtaining the service layers of woven and x-ray shielding material consisting of an organic binder and the escape of the filler on the basis of oxides of rare earth elements and oxides of antimony (III) and yttrium, connect them and cure, then connect them by means of an adhesive (RF application No. 97101961, IPC G 21 F 1/10, publ. 10.03.99 year).

The disadvantages of analog is not enough high technology way, physico-mechanical properties, formulacell and effectiveness of the shielding is made by way of the finished material.

Known as the closest to the claimed method according to technical essence and the achieved technical result of the method of manufacturing a layered x-ray shielding material (RF patent No. 2194317, IPC G 21 F 1/10), which consists in obtaining the service layers of woven and x-ray shielding material obtained by mixing the ingredients of a lead composition of cold hardening, the shielding voltage is lntel of a mixture of oxides of rare earth elements and oxide of antimony (III), the catalyst polyamine and a modifying agent consisting of epoxidised hydrocarbon, the ester of orthophthalic acid and a monohydroxy alcohols, in the following ingredients based on each 100 parts by weight of organosilicon binder:

- epoxydodecane hydrocarbon - 5,0-15,0;

- ester of orthophthalic acid and a monohydroxy alcohols - 0,5-3,0;

- oxides of rare earth elements - 160-180;

oxide of antimony (III) 200-210;

the catalyst is 0.6 to 8.0;

- polyamine - 0,6-3,0.

The aim of the invention is to develop a method with high manufacturability layered x-ray shielding material, effectively protect the personnel radiographic installation.

The disadvantages of the prototype is not sufficiently high ductility and uniformity of the finished material and the adhesion between the layers of the finished material.

A new technical result is ensured in the use of the proposed method is to improve the quality of the finished material by providing ductility and uniformity of the paste, as well as the improvement of physical and mechanical properties of layered material by improving the adhesion between the woven layers and the polymer material, while maintaining the high x-ray shielding properties of the finished material.

The specified task and the new tech is the ski is provided for those in a known method of manufacturing a layered x-ray shielding material comprising a bonding material, curing with receiving a package of layers of woven and x-ray shielding material obtained by mixing the ingredients of a lead composition of cold hardening, the shielding filler of a mixture of oxides of rare earth elements and oxide of antimony (III), the catalyst, polyamine and a modifying agent consisting of epoxidised hydrocarbon, the ester of orthophthalic acid and a monohydroxy alcohols, in the following ingredients based on each 100 parts by weight of organosilicon binder:

- epoxydodecane hydrocarbon - 5,0-15,0;

- ester of orthophthalic acid and a monohydroxy alcohols of 0.5-3.0;

- oxides of rare earth elements - 160-180;

oxide of antimony (III) 200-210;

the catalyst is 0.6 to 8.0;

- polyamine - 0,6-3,0,

in accordance with the proposed method before the receipt of the package layers of woven material impregnorium organic solution of ORGANOMETALLIC compound from the group of organic salts of tin and lead composition is prepared by the sequential mixing of the first organosilicon binder and the modifying agent, then filler to obtain a viscous paste, then catalyst and hardener - polyamine that add a viscous paste C is directly before applying to the treated woven material, the resulting package is subjected to compression molding and curing.

The proposed method is illustrated as follows.

Pre-prepare the x-ray shielding material, which use x-ray shielding composition of cold hardening on the basis of a polymeric binder, shielding filler, which is a mixture of powdered oxides of rare earth elements (REE), oxide of antimony (III)catalyst.

As the silicon-containing binder used silicone rubber, experimental studies on the compatibility of selected shielding filler which showed better results than that achieved in the prototype.

As the shielding component selected complicated filler based on a mixture of REE oxides and oxide of antimony (111), the use of which, as confirmed experimentally, provides better results (compared to the prototype) in reducing the intensity of x-ray radiation (RI).

The composition of the modifying agent is introduced epoxydodecane hydrocarbon polyamine, an ester of orthophthalic acid and a mixture of monohydroxy alcohols, which helped to improve the plasticity and elasticity (physico-mechanical properties) x-ray shielding material.

Obtaining x-ray shielding composition is La x-ray shielding material is carried out by serial dilution of the above binder and the modifying agent with the powdered filler, to obtain a viscous paste, then with a hardener and catalyst within the claimed ratios of components. The hardener and catalyst is introduced into a viscous paste before applying it on the treated woven material. Then paste in the course of time, its viability is applied on the processed sublayer woven material.

The process of mixing the components of powdery filler and binder framework is divided in time that, as the experiments showed significantly improved the compatibility of all components of the paste between themselves and the wettability of the filler particles of the liquid binder. Improving the wettability can significantly increase the ductility and uniformity of the paste, which, in turn, improves the quality of the finished x-ray shielding material.

Impregnation of woven material is carried out by impregnating it in the mass of the organic solution of the ORGANOMETALLIC compound from the group of organic salts of tin. Layers of woven and processed x-ray protection materials combine to curing resin composition and design package. The resulting package is subjected to compression molding and curing at design pressure and normal temperature.

The specified x-ray shielding composition has a high molding property and technology in the process of compressi the authorized processing.

Control tests of the finished x-ray shielding material showed a high degree of shielding of RI, a high level of physical and mechanical properties and environmental safety and material.

The test results are summarized in table 1.

Example 1. The proposed method was tested in laboratory conditions using the provided modes and conditions.

In terms of this example was originally prepared x-ray shielding composition. To do this, first preparing a mixture of powdered oxides of rare-earth elements and oxides of antimony (III) and yttrium as shielding filler. The mixture was stirred in the mixer.

The process of mixing the components of powdery filler and binder basics divided in time. For this pre-cooked pasta, containing the following components in the claimed limits of ratios:

- silicone rubber;

- epoxydodecane hydrocarbon;

- ester of orthophthalic acid and a monohydroxy alcohols;

- filler of a mixture of oxides of rare-earth elements and oxides of antimony (III) and yttrium.

The resulting mixture is treated in the mill for 10-30 minutes.

Cooked pasta can be stored in certain conditions within one month. Next, we take the estimated amount of toothpaste and dosed in the required amounts of ORGANOMETALLIC connected to the I based on organic salts of tin - the cold hardening catalyst and hardener - polyethylenepolyamine (TU 38.303-04-06-90), all mixed for 3-5 minutes on rollers or manually.

The obtained molding the mixture is placed in a mould and frame of the required thickness on a woven base, pre-impregnated with an organic solution of ORGANOMETALLIC compound, make the design pressure and maintain during the day. Then the pressure is released, the mold is removed from the press and dismantle. Ready-made samples subjected to the test trials, the results of which are summarized in table 1. Indicators thickness is determined by the gauge, the uniformity determined by x-ray, density - according to GOST 267-73, spreading - according to GOST 6589-90.

Experimental studies of the proposed method confirmed the high rate of technological ways of increasing the effectiveness of the shielding is made by way of the finished material, high quality.

Table 1
The name and composition of components, mass1234567
Dimethylsiloxane rubber100100100 100100100100
Resin epoxy551010151515
The polyethylenepolyamine0,61,01,22,01,83,01,8
Dibutyl0,51,01,02,01,53,01,5
Catalyst8,06.08,06,08,06,08,0
Filler REE160160170170180180180
The oxide of antimony (111)200200205205210210210
Conventional strength, MPa2,9-3,62,9-3,62,9-3,62,9-3,62,9-3,62,9-3,62,9-3,6
Density, g/cm32,8-2,92,8-2,92,8-2,92,8-2,92,8-2,92,8-2,92,8-2,9
Linear coefficient of olabl is of monochromatic radiation radionuclide 241At cm-116,016,016,016,016,016,016,0
1Plasticity, mm11-1311-1311-1311-1311-1311-1311-13
The uniformity of the x-ray2++++++3-
Note:

1. Plasticity was determined by spreading, GOST 6589-90.

2. "+" - homogeneous;

3. "-" is the unit air inclusions.

A method of manufacturing a layered x-ray shielding material comprising a bonding material, curing with receiving a package of layers of woven and x-ray shielding material obtained by mixing the ingredients of a lead composition of cold hardening, including silicone rubber as a binder, the shielding filler of a mixture of oxides of rare earth elements and oxide of antimony (III), the catalyst, polyamine and a modifying agent consisting of epoxidised hydrocarbon, the ester of orthophthalic acid and a monohydroxy alcohols in the following ingredients based on each 100 parts by weight of Kramnik the organic binder: epoxydodecane hydrocarbon - 5,0-15,0; ester of orthophthalic acid and a monohydroxy alcohols - 0,5-3,0; oxides of rare earth elements - 160-180; oxide of antimony (III) 200-210; catalyst - 6,0-8,0; polyamine - 0,6-3,0, wherein before receiving the package of layers of woven material impregnorium organic solution of ORGANOMETALLIC compound from the group of organic salts of tin and lead composition is prepared by the sequential mixing of the first organosilicon binder and the modifying agent, then filler to obtain a viscous paste, then catalyst and hardener - polyamine that add a viscous paste before applying to the treated woven material received packet is subjected to compression molding and curing.



 

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