Radiation-Resistant Polyolefin Resin Composition with UV Absorbers
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Solution Overview
Problem
Existing radiation-proof resin compositions for insulators and sheaths of wires and cables deteriorate in mechanical characteristics and flame retardancy when exposed to radiation, and increasing additive amounts lead to blooming issues.
Innovation Solution
A radiation-resistant resin composition is developed by adding 0.3 to 1.0 parts of a salicylate-based UV absorber, 0.3 to 5 parts of a benzotriazole-based UV absorber, and 0.3 to 5 parts of a triazine-based UV absorber to 100 parts of a polyolefin-based resin, specifically formulated with ethylene-ethyl acrylate, ethylene-vinyl acetate, and α-olefin copolymers, to enhance radiation resistance while minimizing additive blooming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of mixed additives is increased to improve radiation-resistant properties, then radiation resistance is improved, but blooming (spout of powder) of the additives occurs
Solution Approach 1:
The patent optimizes the concentration parameters of three UV absorbers (salicylate-based: 0.01-1 part, benzotriazole-based: 0.01-5 parts, triazine-based: 0.01-5 parts per 100 parts resin) to achieve effective radiation resistance while preventing blooming. This precise parameter control resolves the contradiction by finding the optimal dosage range where protective effect is maximized without causing additive migration.
Solution Approach 2:
The patent creates a composite additive system combining three different UV absorber types with distinct mechanisms. The salicylate-based UV absorber absorbs UV radiation, the benzotriazole-based UV absorber provides synergistic protection, and the triazine-based UV absorber enhances overall radiation resistance. This composite approach achieves superior radiation protection at lower total additive concentrations, preventing blooming while maintaining effectiveness.
2Object-affected harmful factors
If conventional UV absorbers are used to protect from radiation, then light resistance is improved, but mechanical characteristics deteriorate after exposure to radiation
Solution Approach 1:
The patent modifies the chemical structure parameters of the UV absorbers by selecting specific compounds within each class (salicylate-based, benzotriazole-based, and triazine-based) that maintain polymer matrix compatibility. This structural optimization ensures that the UV absorbers provide light resistance without causing excessive cross-linking or degradation that would deteriorate mechanical properties after radiation exposure.
Solution Approach 2:
The patent employs a composite system of three UV absorber types that work synergistically to protect the polyolefin resin. The combination provides comprehensive UV absorption across different wavelengths while maintaining the polymer's mechanical integrity. The multi-component system distributes the radiation protection function, preventing any single additive from causing excessive mechanical deterioration.
3Strength
If conventional resin compositions are used in radiation environments, then initial mechanical characteristics are good, but flame retardant properties deteriorate after exposure to radiation
Solution Approach 1:
The patent selects UV absorbers with specific chemical parameters that do not interfere with the flame retardant mechanism of the polyolefin resin. The chosen salicylate-based, benzotriazole-based, and triazine-based UV absorbers have molecular structures that allow them to absorb UV radiation without creating radical species that would compromise flame retardancy or degrade the resin's inherent fire-resistant properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition maintains excellent mechanical characteristics and prevents blooming, ensuring durability and radiation resistance even at high radiation doses (2.5 MGy), suitable for use in radiation-exposed environments like nuclear facilities.
Implementation Method 1
adding 0.3 to 1.0 parts by mass of a salicylate-based UV absorber, 0.3 to 5 parts by mass of a benzotriazole-based UV absorber, and 0.3 to 5 parts by mass of a triazine-based UV absorber
Data Source
Figure 1
AI summary
There are provided a radiation-proof resin composition that is excellent in mechanical characteristics even after exposure to harsh radiation (with 2.5 MGy), that exhibits a suitable radiation-resistant properties by a small amount of mixed additives, and that can suppress the blooming of the additives, and a radiation-resistant wire/cable. The radiation-resistant resin composition is obtained by adding 0.3 to 1.0 parts by mass of a salicylate-based UV absorber, 0.3 to 5 parts by mass of a benzotriazole-based UV absorber, and 0.3 to 5 parts by mass of a triazine-based UV absorber to 100 parts by mass of a polyolefin-based resin.