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A gadolinium-based metal-organic framework composite shielding material and its preparation method

A metal-organic framework and organic framework technology, which is applied in the field of gadolinium-based metal-organic framework composite shielding materials and its preparation, can solve the problems of uneven neutron shielding performance, poor shielding performance, difficulty in improving gadolinium metal content and dispersion, etc. , to achieve the effect of improving neutron shielding performance and enhancing neutron shielding performance

Active Publication Date: 2021-04-27
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the poor compatibility between gadolinium metal in the inorganic phase and the polymer material in the organic phase makes it difficult to increase the content and dispersion of gadolinium metal in the gadolinium / polymer composite material, which also results in poor stability of this type of material , uneven neutron shielding performance and poor shielding performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Pre-synthesized Gd(BDC) 1.5 (H 2 O) 2 : Select Gd(NO 3 ) 3 ·6H 2 O and disodium terephthalate are reaction raw materials, weigh 2.0g polyvinylpyrrolidone and dissolve in 40mL deionized water, add 2mL concentration of 0.15M Gd(NO 3 ) 3 ·6H 2 O aqueous solution and the aqueous solution of disodium terephthalate of 2mL 0.2M are placed in the sonicator (frequency is 40KHz), under room temperature condition, centrifugation or suction filtration after ultrasonic 0.5h obtain gadolinium-based metal-organic framework material: Gd( BDC) 1.5 (H 2 O) 2 , and washed several times with deionized water and absolute ethanol, and dried under vacuum at 60°C to collect Gd(BDC) 1.5 (H 2 O) 2 powder samples.

[0042] Gd(BDC) 1.5 (H 2 O) 2 Composite ratio with polyethylene:

[0043] Gadolinium-based metal-organic framework (Gd(BDC) 1.5 (H 2 O) 2 ): 10 parts by weight;

[0044] Polyethylene: 100 parts by weight;

[0045] Auxiliary agent (zinc hydroxide): 2 parts by weigh...

Embodiment 2

[0049] Pre-synthesis of gadolinium-based metal-organic framework material according to the steps of Example 1: Gd(BDC) 1.5 (H 2 O) 2 , compounded with ultra-high molecular weight polyethylene. Compound ratio:

[0050] Gadolinium-based metal-organic framework (Gd(BDC) 1.5 (H 2 O) 2 ): 55 parts by weight;

[0051] Polyethylene: 55 parts by weight;

[0052] Auxiliary agent (zinc hydroxide): 1 part by weight.

[0053] Gd(BDC) 1.5 (H 2 O) 2 Molding of composite shielding material with polyethylene: Weigh each component according to the proportion, and melt and knead several ingredients in a mixer at a high temperature of 185°C for 1 hour until they are evenly mixed. Transfer the mixture to a mold, heat to 200°C, and apply a pressure of 20 MPa for hot pressing at the same time, hold the pressure for 2 hours; then continue to apply a pressure of 20 MPa, cool for 2 hours, and release the film.

[0054] For the prepared Gd(BDC) 1.5 (H 2 O) 2 Structural characterization o...

Embodiment 3

[0056] Pre-synthesized Gd(BTC)(H 2 O) 4 : select GdCl 3 ·6H 2 O and trisodium 1,2,4-benzenetricarboxylate are the raw materials for the reaction. First prepare two parts of microemulsion 200mL of 0.5M cetyltrimethylammonium bromide / n-hexanol / pentane (volume ratio 1:15), then add 2.7mL of 0.05M 1,2,4-trisodium benzenetricarboxylate aqueous solution and 2.7mL of 0.05M GdCl 3 ·6H 2 O aqueous solution was stirred separately for 10 min to form a transparent homogeneous liquid; the two microemulsions were mixed, and stirring was continued for 8 h to obtain a light blue emulsion containing the final product. The sample was recovered by centrifugation, washed with ethanol, and dried to collect Gd(BTC)(H 2 O) 4 powder samples.

[0057] Gd(BTC)(H 2 O) 4 Composite ratio with polyethylene:

[0058] Gadolinium-based metal-organic frameworks (Gd(BTC)(H 2 O) 4 ): 10 parts by weight;

[0059] Polyethylene: 100 parts by weight;

[0060] Additives (boron carbide and zinc hydroxid...

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Abstract

The invention discloses a gadolinium-based metal organic framework composite shielding material and a preparation method thereof, and relates to the field of neutron radiation protection. The gadolinium-based metal-organic framework composite shielding material is a composite material that is mixed with gadolinium-based metal-organic framework material and polyethylene at a weight ratio of 2:1-1:10 and formed by solvent volatilization or hot pressing. The porosity and organic-inorganic hybrid properties of gadolinium-based metal-organic framework materials increase its compatibility with polyethylene, which promotes the synthesis of composite materials with higher gadolinium content and gadolinium dispersion, while high gadolinium content and dispersion It will directly affect the neutron shielding performance of the composite material. The gadolinium-based metal-organic framework composite shielding material provided by the invention has higher heat resistance stability, thermal neutron shielding ability, and better mechanical properties.

Description

technical field [0001] The invention belongs to the field of nuclear radiation protection and radiation shielding materials, and in particular relates to a gadolinium-based metal-organic framework composite shielding material and a preparation method thereof. Background technique [0002] With the rapid development of nuclear energy and nuclear reactor technology, issues related to nuclear radiation safety and radiation protection have received more and more attention. In order to strengthen the radiation protection of operators who have been engaged in radiation equipment maintenance and accident rescue for a long time, the development of lightweight shielding composite materials for protective clothing has extremely important scientific research significance and economic value. Neutron radiation is the most important component of nuclear reactor radiation. Generally, after the neutron shielding effect of the inner structural material of the nuclear reactor, most of the neu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L87/00C08K3/22C08K3/38G21F1/10
CPCC08K2003/2296C08L23/06C08L87/00C08L2207/068G21F1/106C08K3/22C08K3/38
Inventor 黄群英肖娟定宋亮亮毛小东吴宜灿
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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