Compound shielding material containing MOF derivative porous gadolinium oxide and preparation method

A compound shielding and gadolinium oxide technology, which is applied in the field of radiation shielding materials and nuclear radiation protection, can solve problems such as difficulty in increasing rare earth content, and achieve excellent mechanical properties, superior chemical corrosion resistance, and high hardness.

Active Publication Date: 2019-01-11
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

Based on this, by obtaining epoxy resin-based shielding composites with high gadolinium content, it is expected to solve the problem that the rare earth content in rare earth-based polymer composites is difficult to increase

Method used

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  • Compound shielding material containing MOF derivative porous gadolinium oxide and preparation method
  • Compound shielding material containing MOF derivative porous gadolinium oxide and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] According to attached figure 2 According to the process, the epoxy resin-based composite shielding material is prepared step by step.

[0035] 1) Synthesis of Gd(BDC) 1.5 (H 2 O) 2 : select GdCl 3 ·6H 2 O and methylamine terephthalate as reaction raw materials, weighed 2.0g of polyvinylpyrrolidone and dissolved it in 16mL of deionized water, and added 92mL of GdCl with a concentration of 0.15M in sequence 3 ·6H 2 O aqueous solution and 92mL of 0.2M aqueous solution of methylamine terephthalate were placed in an ultrasonic instrument (frequency 40KHz), at room temperature, ultrasonically filtered for 0.5h, and washed several times with deionized water, at 60°C Collect Gd(BDC) by vacuum drying 1.5 (H 2 O) 2 powder samples.

[0036] 2) p-Gd 2 o 3 Preparation: Weigh an appropriate amount of Gd(BDC) 1.5 (H 2 O) 2 The material was placed in a muffle furnace and calcined at 600°C for 5 hours in an air atmosphere, and samples were collected. Its chemical compos...

Embodiment 2

[0044] 1) Synthesize Gd (BDC) according to the experimental procedure of Example 1 1.5 (H 2 O) 2 .

[0045] 2) p-Gd 2 o 2.8 Preparation: Weigh an appropriate amount of Gd(BDC) 1.5 (H 2 O) 2 The material was placed in a muffle furnace and calcined at 600° C. for 5 h in a nitrogen atmosphere, and samples were collected. Its chemical composition is proved by powder X-ray diffraction test, and the p-Gd is proved by nitrogen adsorption and desorption test 2 o 2.8 The multi-level channels with interspersed micropores and mesopores are verified by scanning electron microscopy, and their morphology features inherit Gd(BDC) 1.5 (H 2 O) 2 Due to insufficient oxygen during calcination, the final structural formula of gadolinium oxide is p-Gd 2 o 2.8 .

[0046] 3) p-Gd 2 o 2.8 Preparation of composite shielding material with epoxy resin:

[0047] Epoxy resin (JEh-041): 50 parts by weight

[0048] Curing agent (methyltetrahydrophthalic anhydride): 3 parts by weight

[00...

Embodiment 3

[0053] 1) Synthesis of 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 , an aqueous solution of trisodium 2,4-benzenetricarboxylate and 2.7 mL of 0.05M GdCl 3 ·6H 2 O aqueous solution was stirred separately for 10 minutes to form a transparent and uniform liquid; the two microemulsions were mixed, and stirring was continued for 8 hours 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.

[0054] 2) p-Gd 2 o 3 Preparation: Weigh an appropriate amount of Gd(BTC)(H 2 O) 4 The material was placed in a muffle furnace and calcined at 700°C for 5 hours in an air atmosphere, and samples were collected. Its chemical composit...

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Abstract

The invention discloses a compound shielding material containing MOF derivative porous gadolinium oxide and a preparation method and relates to the field of neutron radiation protection. The compoundshielding material is prepared from the following raw materials in parts by weight: 1-100 parts of epoxy resin, 1-10 parts of curing agent, 1-100 parts of auxiliaries and 1-100 parts of MOF derivativegadolinium oxide, wherein the porous gadolinium oxide is acquired from the process of high-temperature calcination and pyrolysis of gadolinium-based metallic organic framework material. Epoxy resin is a neutron slowing material; gadolinium element is a neutron absorbing material; the porous feature of MOF derivative gadolinium oxide is beneficial to strong interaction with an epoxy resin substrate. The compound shielding material containing MOF derivative porous gadolinium oxide provided by the invention has excellent thermal neutron shielding capacity, high thermal stability and high mechanical stability.

Description

technical field [0001] The invention belongs to the field of nuclear radiation protection and radiation shielding materials, and in particular relates to a composite shielding material containing MOF-derived porous gadolinium oxide and a preparation method thereof. Background technique [0002] The development of nuclear science and technology has led to more and more attention to radiation issues, especially the neutron ray shielding in the use of nuclear reactors is particularly important. The shielding of neutron rays generally selects materials with high hydrogen content and large neutron absorption cross section. Commonly used materials include polyethylene, boron-containing polyethylene, lead-boron polyethylene, etc. Although the neutron shielding effect of polyethylene-based polymer materials can meet the requirements, the operating temperature is relatively low, generally not exceeding 80°C. Therefore, it is necessary to research and develop neutron shielding composi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08L81/06C08L9/02C08K7/24C08G83/00
CPCC08G83/008C08L63/00C08L2201/08C08L81/06C08K7/24C08L9/02
Inventor 肖娟定宋亮亮毛小东黄群英吴宜灿
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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