Radiation Resistance of Silicone Resin
Jun 25, 2024
Organic silicon coatings have good radiation resistance and are therefore commonly used in the nuclear industry. Its radiation resistance varies with the substituents on silicon atoms, such as organosilicon containing phenyl groups having greater radiation resistance than organosilicon containing methyl and ethyl groups. Organosilicons containing methyl groups are generally resistant to 107 to 10 rad, while those containing phenyl groups are resistant to 109 rad.
The radiation dose that organic silicone resin can withstand without fillers is (2 58-25 8) X 10 gas/kg;
Add 3 orders of magnitude when there is filler. When the organic silicone resin with asbestos filler reaches lMGy, the breaking strength increases by 10%, the shear strength decreases by 5%, and the hardness and density both increase by 5%. The main dielectric parameters of Y-irradiated silicone resin show little change when it reaches lOMGy. The glass cloth impregnated with organic silicone resin can absorb a dose of up to 8 At 7MGy, there was no significant change in its electrical and mechanical properties. Organic silicone resin has excellent heat resistance, and some organic silicone resins with fillers are stable at 500-600 ℃.
Organic silicone resin has good radiation stability and can be used as B, Y, and neutron shielding materials at high temperatures to compensate for the low thermal stability of polyethylene materials used for shielding; But its hydrogen content is less than that of polyethylene, and its shielding effect is worse than the latter, which can be improved by adding greenhouse element compounds.
Organic silicone resin fiberglass has good heat resistance and moderate radiation stability, and there is no significant change in intensity after 200 hours of irradiation (O. 83MGy) at room temperature (25 ° C); Irradiation at 260 ° C (0 The intensity of the sample (21MGy) increased by 10% after 50 hours compared to the sample without irradiation at 260 ° C; Radiation (0 83MGy) has a strength decrease of nearly 30% after 200 hours, mainly used as a high-temperature insulation material, shielding material, or composite shielding material adhesive.
The hardness and airtightness of the organic silicone resin coating are not high, and there is a significant improvement in hardness and wear resistance after irradiation at room temperature (50MGy).
The hydrophobicity and permeability of modified silicone resin are between those of silicone resin and organic resin, that is, the hydrophobicity and permeability of modified silicone resin are smaller than those of silicone resin but greater than those of organic resin.
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