X-ray shielding composition

 

(57) Abstract:

The invention relates to the field of polymeric materials used for the manufacture of protective clothing for personnel x-ray machines, with the fields of science and engineering that require protection from x-radiation (RI). Technical result: ensuring high level of technological inclusion compositions in the structure layered products, increase adhesion to the woven base, extension of time intervals viability of the uncured composition while maintaining the x-ray shielding properties. The inventive composition comprises a silicon-containing polymer binder, ORGANOMETALLIC compound from the group of salts of tin (IV), as a catalyst shielding filler of a mixture of oxides of rare earth elements (REE), yttrium oxide and oxide of antimony (III), as well as the modifying agent. The modifying agent comprises a mixture of compounds from the group epoxidised hydrocarbons, compounds from the group polyamine, compounds from the group of ester of orthophthalic acid and a monohydroxy alcohols of the homologous series of C1-C9. The ratio of ingredients in wt. hours for every 100 wt.h. silicon-containing binder: pokidov REE 160,0-180,0; the oxide of antimony (III) 200,0-210,0, the catalyst of 6.0-8.0. 4 C.p. f-crystals, 1 table.

The invention relates to the field of polymeric materials used to protect personnel and equipment from x-ray radiation, and can be used for the manufacture of x-ray protection service, x-ray shielding screens in medicine, chemical laboratories, nuclear power plants and in other areas of science and technology, where you must use tools that protect against x-ray radiation (RI).

Known x-ray shielding composition containing a lead filler on the basis of REE oxides, polymeric binder and a catalyst (patent RF 2115559, IPC G 21 F 1/10, publ. 20.05,98,, bull. 13/98).

However, in known compositions provided relatively low time intervals viability, mechanical strength and processability when applying the composition on a woven base.

Closest to the claimed x-ray protection is a composition known from the patent of the Russian Federation 2138865, CL IPC G 21 F 1/10, publ. 27.09.99,, bull. 27/99, containing a lead filler on the basis of oxides of rare earth elements, silicon binder and catalyst from the group of salts of tin (IV) as camaleonti and adhesion, and in consequence of this and the processability when applied to the woven base in the composition of the multilayer product.

The task of the authors of the material is the development of a lead composition, characterized by high mechanical properties and has a sufficiently long pot life during which it would be possible to perform the various process steps required for the manufacture of protective garments and clothing, as well as the preservation of indicators characterizing the ability of the finished composition to a weakening of the RI.

A new technical result is ensured in the manufacture and use of the material, is to ensure high levels of technological inclusion composition in the multilayer structure of the product by improving the opacity, enhance adhesion to woven basis, extension of time intervals viability of the uncured composition while maintaining the x-ray shielding properties.

Additional technical result consists in the optimization of the mode of curing the composition of the components of the velocity and the curing time.

Additional technical results is SS="ptx2">

Additional technical result is to improve the processability of the coating composition on a thin woven base, and the weight reduction products.

Additional technical result consists in the optimization of the mode of curing.

These task and new technical results are provided by the fact that in the known x-ray shielding composition comprising silicon-containing polymer binder, ORGANOMETALLIC compound from the group of salts of tin (IV) as a catalyst, the shielding filler containing a mixture of oxides of rare earth elements, yttrium oxide and the oxide of antimony (III), in accordance with the proposed composition contains additionally the modifying agent from the mixture of compounds from the group polyamine - product armirovanie dichloroethane and compounds from the group epoxidised hydrocarbons, as well as compounds from the group of esters of orthophthalic acid and a monohydroxy alcohols of the homologous series C1-C9 in the following ratio of ingredients, wt. hours for every 100 wt. including silicon-containing binder:

- modifying agent - 6,1-21,0:

consisting of:

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

- MESI oxides of rare-earth elements and yttrium oxide - 160,0-180,0,

oxide of antimony (III) - 200,0-210,0;

and catalyst - 6,0-8,0

In addition, x-ray shielding composition comprises a polyethylenepolyamine.

In addition, x-ray shielding composition contains as a complex ester of orthophthalic acid and a monohydroxy alcohols of the homologous series of C1-C9 dibutyl phthalate.

In addition, x-ray shielding composition contains as epoxidised hydrocarbon epoxy resin with a molecular mass of 390-430.

In addition, x-ray shielding composition as catalyst contains triethanolaminato.

The essence of the proposed x-ray shielding composition is explained as follows.

Initially prepare a binder and a filler.

The choice of silicone binder based on ensuring the conditions for the maximum combination of powder filler and binder, as well as the modifying agent, which allows to significantly extend the range of the viability of the uncured composition.

Then prepare a mixture of powdered oxides of rare-earth elements and oxides of antimony (III) and yttrium in the present limits of the ratios as shielding filler.

increase to the stated in the formula of values has led to the increase of the efficiency of use of the composition in dry condition when combined with a woven base in the composition of the multilayer protective products, while maintaining the x-ray shielding properties of the finished material.

As filler in the proposed composition is used a mixture of oxides of rare earth elements, yttrium oxide and oxide of antimony (III) in the range of the claimed amounts of the components in the composition of the proposed x-ray shielding composition, resulting in the preservation of the x-ray shielding properties of the finished material.

Use as the modifying agent, it is a mixture of polyamine - product armirovanie dichloroethane and compounds from the group epoxidised hydrocarbons, and compounds from the group of esters of orthophthalic acid and a monohydroxy alcohols of the homologous series of C1-C9, as shown by experimental studies, based on ensuring high levels of technological inclusion composition in the multilayer structure of the product by improving the opacity, enhance adhesion to the woven base and other physico-mechanical properties, extensions of time intervals viability of the uncured composition while maintaining the x-ray shielding properties of the material.

It is possible to assume that the effect of the modifying agent on the properties of the claimed composition is to create a less viscous and soderzhaschego hydrocarbon and ether complex orgoglio acid and a monohydroxy alcohol, shows the properties of a plasticizer, and amendment, the effect of which is manifested in the regulation of formation of optimum quality connections inside the solidifying composition and woven products. This decreases the density of links in the resulting polymer and increases the ability of the composition to the formation of a solid film on the fabric increases its fluidity.

The best is to use as a compound from the group of polyamines - polyethylenepolyamine, because this ensures the alignment of the velocity of the interaction of all components of the composition and rate of curing time.

It is experimentally shown that the most effective is the use of dibutyl phthalate as a compound from the group of esters of orthophthalic acid and a monohydroxy alcohol of a homologous series of C1-C9 to ensure high technology coating composition on a woven base and covering ability, manifested in obtaining a continuous and uniform coating thickness. When choosing dibutyl phthalate, showing the properties of a plasticizer and increases the plasticity and physico-mechanical properties of the finished material, experia powder filler in the composition. This significantly reduces the viscosity of the composition.

In addition, when applying the composition to the woven base is probably wetting of the fabric, which greatly contributes to increasing opacity of the composition and to improve the processability when applied to fabric.

Use as epoxidised hydrocarbon epoxy resin with a molecular mass of 390-430 contributes to a more durable binding composition with filler and tissue, resulting in improved processability of the coating composition on the woven base of the product.

This effect allows the use of the above resin in some cases, for applying the composition on a thin tissue that, in turn, will further reduce the weight of the finished product due to the resulting possibility of reducing the thickness of the coating.

The most optimal for the implementation of the soft-mode hardening of the composition is used as a catalyst of triethanolaminato.

After mixing all of the components of the composition over a longer pot life than it was postign the Le which the samples subjected to laboratory tests.

Thus, when using the modifying components in the claimed composition in the present limits of ratios, along with the known components of the binder, shielding filler and vulcanizer provided higher end products, namely improved manufacturability inclusion composition in the multilayer structure of the product by improving the opacity, enhance adhesion to woven basis, extension of time intervals viability of the uncured composition while maintaining the x-ray shielding properties.

Industrial applicability of the claimed x-ray shielding composition can be confirmed by the following examples.

Example 1. In terms of this example was obtained by x-ray shielding composition comprising a shielding powdered filler, composed of a mixture of oxides of rare earth elements, yttrium oxide - WRC-5 (TU 95.462-77), in the amount of 160 wt. hours and oxide of antimony (III) THE 6-09-3267-84 200 wt. hours per 100 wt. H. binder.

As organosilicon polymer binder in the composition applied low-molecular rubber SCTN mark G, molecular weight 15103-3 is Olga tin (IV) catalyst selected 68 (TU 38.303-04-05-90) in an amount of 8.0 wt. h

As the modifying agent for increasing intervals viability of the selected mixture of epoxy resin brand ED-20 with a molecular mass of 390-430 (GOST 10587-84) in an amount of 5.0 wt.h. and polyethylenepolyamine (TU 6-02-594-80) in an amount of 0.6 wt.h.

As a complex ester of orthophthalic acid and a monohydroxy alcohol selected dibutyl phthalate, showing properties and plasticizer, and regulator structures in the amount of 0.5 wt. h

To obtain x-ray shielding compositions suitable for the production of multilayer material, first preparing a mixture of powdered oxides of rare-earth elements (REE) and yttrium oxide as a screening filler - WRC-5 (TU 95.462-77) and oxide of antimony (Ill) by hand or in the mixer.

The mixture of fillers were mixed with silicon-containing polymer binder is a low-molecular rubber SCTN mark G, epoxy resin brand ED-20 and dibutyl phthalate.

The resulting mixture was processed in the mill for 10-30 minutes at room temperature.

Then the mixture was dosed out the estimated amount of the catalyst 68 and hardener - polyethylenepolyamine, all was stirred for 3-5 minutes on a roll mill or by hand.

For the manufacture of test samples prepared composition was applied to the woven base - Voile (GOST 12239-79).

Further, in examples 2-9 in the conditions of example 1 were prepared compositions using specific ratios of the claimed range of values.

Data on composition and properties of the composition are summarized in table. Example 10 relates to the prototype.

The table shows that the use of the composition the proposed composition of all components listed in the claimed limits of their content provides obtaining highly effective protective material with high x-ray attenuation, physical-mechanical characteristics and processability of the combination of the composition with a woven base that allows to use it in the manufacture of protective clothing.

1. X-ray shielding composition comprising silicon-containing polymer binder, ORGANOMETALLIC compound from the group of salts of tin (IV) as a catalyst, the shielding filler containing a mixture of oxides of rare earth elements, yttrium oxide and oxy, containing a mixture of compounds from the group polyamine - product armirovanie dichloroethane, compounds from the group epoxidised hydrocarbons, and compounds from the group of esters of orthophthalic acid and a monohydroxy alcohols of the homologous series of C1-C9 in the following ratio of ingredients, wt.h. for every 100 wt.h. silicon-containing binder: modifying agent 6,1-21,0 consisting of epoxidised hydrocarbon 5,0-15,0, polyamine 0,6-3,0, ester of orthophthalic acid and a monohydroxy alcohols of 0.5 to 3.0, and filler from a mixture of oxides of rare earth elements and yttrium oxide 160,0-180,0, oxide of antimony (III) 200,0-210,0, catalyst 6,0-8,0.

2. X-ray shielding composition under item 1, characterized in that the compound of the group polyamine in the composition of the modifying agent contains a polyethylenepolyamine.

3. X-ray shielding composition under item 1, characterized in that it contains as a complex ester of orthophthalic acid and a monohydroxy alcohols of the homologous series of C1-C9 - dibutyl phthalate.

4. X-ray shielding composition under item 1, characterized in that it contains as epoxidised hydrocarbon epoxidation resin (mol.m. 390-430.

5. Leominster.

 

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