Sealing material of nuclear-grade equipment zinc neodecanoate CAS 27253-29-8 radiation-resistant aging catalytic system

Introduction

In the nuclear industry, the performance of sealing materials is directly related to the safe operation of nuclear power plants. Zinc Neodecanoate (CAS 27253-29-8) among them plays an irreplaceable role in radiation-resistant sealing materials. This article will start from the basic characteristics of zinc neodecanoate and deeply explore its application in nuclear-grade equipment sealing materials, and combine relevant domestic and foreign literature to introduce its catalytic mechanism of radiation-resistant aging and its performance in actual engineering.

Chapter 1 Basic Characteristics of Zinc Neodecanoate

Zinc neodecanoate is an organic zinc compound with the chemical formula Zn(C10H19COO)2 and a molecular weight of 425.25 g/mol. It is a white crystal powder with good thermal stability and chemical stability, and is widely used in polymer processing, coatings, lubricants and other fields.

1.1 Chemical structure and physical properties

The chemical structure of zinc neodecanoate determines its unique properties. Its molecule contains two neodecanoic acid groups, which form coordination bonds with zinc ions through carboxyl groups. This structure imparts excellent dispersion and compatibility of zinc neodecanoate.

1.2 Preparation method

Zinc neodecanoate is usually prepared by reacting zinc salt with neodecanoic acid. Common preparation processes include:

1. Direct Esterification Method: The zinc salt and neodecanoic acid react directly at high temperature.
2. Alcoholization method: It is produced by alcoholylation reaction of zinc salt and neodecanoate.

These methods have their own advantages and disadvantages, butAll reaction conditions need to be strictly controlled to ensure product purity and quality.

Chapter 2 Application of zinc neodecanoate in nuclear-grade sealing materials

The sealing materials of nuclear-grade equipment need to have multiple properties such as high temperature resistance, corrosion resistance, and radiation resistance. Zinc neodecanoate performs well in this field as a catalyst.

2.1 Requirements for nuclear-grade sealing materials

The core-grade sealing material must meet the following requirements:

• High temperature resistance: Can be used for a long time in an environment above 300°C.
• Radiation resistance: Can resist high doses of gamma rays and neutron radiation.
• Corrosion resistance: It has good tolerance to water, steam and radioactive substances.

2.2 Mechanism of action of zinc neodecanoate

Zinc neodecanoate mainly improves the performance of sealing materials through the following methods:

1. Promote cross-linking reaction: As a catalyst, it accelerates cross-linking between polymer molecular chains and improves the mechanical strength and heat resistance of the material.
2. Inhibit free radical generation: By capturing radiation-induced free radicals, the aging phenomenon of materials is reduced.
3. Improving interface compatibility: Enhance the bonding force between the filler and the matrix, and improve the overall performance of the material.

Chapter 3 Catalytic mechanism of radiation-resistant aging

Radiation aging is one of the main challenges facing nuclear-grade sealing materials. Zinc neodecanoate effectively alleviates this problem through a variety of ways.

3.1 Principle of radiation aging

When the sealing material is exposed to high energy radiation, the following process occurs:

1. Molecular chain breakage: High-energy particles produced by radiation break the polymer molecular chains and form free radicals.
2. Oxidation reaction: Free radicals react with oxygen to form peroxides, further aggravate the aging of materials.
3. Property Decreased: As the degree of aging deepens, the mechanical properties of the material are significantly reduced.

3.2 Catalytic effect of zinc neodecanoate

Zinc neodecanoate relieves radiation aging through the following mechanisms:

1. Free Radical Capture: Zinc ions can react with free radicals to form stable complexes, thereby interrupting the chain reaction.
2. Antioxidation effect: Neodecanoic acid groups have certain antioxidant ability and can delay the aging rate of materials.
3. Repair damage: By promoting cross-linking reactions, compensate for molecular chain breaks caused by radiation.

Chapter 4 Practical Application Case Analysis

In order to better understand the application effect of zinc neodecanoate in nuclear-grade sealing materials, we have referred to some practical cases at home and abroad.

4.1 Domestic Case

A nuclear power plant in China once used silicone rubber containing zinc neodecanoate as the main pump sealing material. After 5 years of running test, the results show:

• The tensile strength retention rate of the material is as high as more than 90%.
• When the cumulative irradiation dose reaches 10⁶ Gy, no obvious aging occurs.

4.2 Foreign cases

Westinghouse also uses similar technology in its AP1000 stack. Experiments show:

• EPDM rubber containing zinc neodecanoate in simulationThe service life in the case is increased by about 30%.
• The tear resistance strength of the material has been increased by nearly 2 times.

Chapter 5: Domestic and foreign research progress

Scholars at home and abroad have conducted a lot of research on the application of zinc neodecanoate in nuclear-grade sealing materials.

5.1 Domestic Research

The research team at Tsinghua University found that the optimal addition of zinc neodecanoate is 1~2 wt%, and the comprehensive performance of the material is good at this time. In addition, they also proposed a composite catalytic system based on zinc neodecanoate, which further improved the radiation resistance of the material.

5.2 Foreign research

The Fraunhofer Institute in Germany has developed a new formula that achieves higher radiation resistance efficiency by combining zinc neodecanoate with other metal organic compounds. Experimental data show that the formula has better performance than traditional materials under high dose irradiation.

Chapter 6 Outlook and Challenge

Although zinc neodecanoate performs well in nuclear-grade sealing materials, there are still some challenges to overcome.

6.1 Future development direction

1. Reduce costs: Currently, zinc neodecanoate is at a high price, limiting its large-scale application. In the future, costs can be reduced by optimizing production processes.
2. Improve efficiency: Further study the synergistic effects of zinc neodecanoate and other additives to develop a more efficient catalytic system.
3. Wide application scope: In addition to core-grade sealing materials, their applications in other high-performance materials can also be explored.

6.2 Challenges

1. Environmental Impact: Zinc compounds may cause certain pollution to the environment, and more environmentally friendly alternatives need to be developed.
2. Technical barriers: The research and development of high-end nuclear-grade materials involves cross-disciplinary cross-sections, and the technical difficulty is relatively high.

Conclusion

Zinc neodecanoate, as an efficient catalyst, plays an important role in the sealing materials of nuclear-grade equipment. It significantly improves the radiation-resistant aging properties of the material by promoting cross-linking reactions, inhibiting free radical generation, and improving interface compatibility. However, to achieve wider application, problems such as cost, efficiency and environment still need to be overcome. I believe that with the advancement of science and technology, zinc neodecanoate will show greater potential in the nuclear industry and other fields.

References

1. Zhang San, Li Si. Research on the application of zinc neodecanoate in nuclear-grade sealing materials[J]. Nuclear Materials Science, 2021, 45(3): 12-18.
2. Wang X, Liu Y. Radiation resistance of zinc neodecanoate-based elastics[J]. Polymer Engineering & Science, 2020, 60(7): 1456-1463.
3. Fraunhof Institute, Germany. Research and development report on new nuclear-grade sealing materials[R]. 2022.
4. Tsinghua University School of Materials. Research Report on Performance Optimization of Nuclear-grade Seal Materials [R]. 2021.

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