Ding Bao analysis of the ultraviolet aging test box on the vulcanized rubber aging understanding
The purpose of the UV aging test chamber is to accelerate the physicochemical properties of these non-metallic materials, such as vulcanized rubber, after they are irradiated with ultraviolet light. The so-called acceleration is to accelerate the chemical reaction of polymers in rubber and other materials through a strengthened energy, such as: rubber materials, seals, tires, shoe soles, shock absorbers, etc. They can produce physical and chemical properties under natural light irradiation. For example, the color difference, pull-up strength, abrasion resistance, elasticity, etc. will take a long time to change, which is very unfavorable for the real-time inspection of the aging test of each batch of products, because it is allowed to age under natural conditions. It may take months, even years, or decades. Shock absorbers are used in automobiles and generally take several years to replace. Therefore, after each rubber formula came out, rubber engineers must do aging weather test, then, used to simulate the accelerated aging of sunlight UV aging test equipment, etc. came into being.
Ultraviolet aging test box is to use the corresponding fluorescent tube to generate ultraviolet light, simulate sunlight, but the intensity is stronger than the intensity of natural light, so that it can be called "accelerated aging."
So how does UV light accelerate aging of them?
1. We know that rubber is made up of a number of macromolecules that contain unsaturated segments. The vulcanizing agent first undergoes chemistries with unsaturation, such as double bonds and triple bonds, on unsaturated moieties. The reaction causes cross-linking, which leads to a net structure, which results in elastic, strength, and other physical properties.
2. Partially unsaturated bonds still exist in the rubber polymer chain after vulcanization.
3. There are some unstable functional groups above the polymer chain.
4. The wavelength range of ultraviolet light is between 10 nm and 400 nm (Usually, UC-A band is used). It belongs to light with short wavelength and large energy range in visible light. This part of light irradiates these unsaturated bonds or is unstable. After the functional group is on, its energy is enough to stimulate the unsaturated bond in the molecule to open. These opened unsaturated bonds are very active and will immediately undergo chemical reactions. Some react with other groups in their own molecular chains, and some react with other external groups, thus changing the original formula design of rubber. Performance.
As the current replacement of rubber products is fast, regular aging tests have become necessary, and the application of UV aging test chambers will become more and more extensive.
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