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Dongguan Silicone Products Factory tells the reasons for the aging of silicone products

Release time:

2019-05-30 12:30

Source:

DongguanSilicone ProductsFactory tells the reasons for the aging of silicone products
 
Product features superior, non-toxic and tasteless, resistant to high and low temperature that we must be associated with the silicone products, all aspects of the function really have so superior? For silicone products, excellent heat resistance, cold resistance, safety, transparency, high strength, flame retardancy and other characteristics, so that since the introduction of the growing scope of application. However, the best products will gradually age after long-term use. In order to delay the aging time and make it serve us for a longer time, we must understand what causes the aging of silicone products:
1, the role of heat to increase the temperature can cause thermal cracking or thermal crosslinking of silicone rubber products. But the basic role of heat or activation. Increase the oxygen diffusion rate and activate the oxidation reaction, thereby accelerating the rubber oxidation reaction rate, which is a common aging phenomenon-thermal oxygen aging.
2, the role of oxygen oxygen in the rubber with the rubber molecules free radical chain reaction, molecular chain fracture or excessive crosslinking, causing the change of silicone rubber products performance. Oxidation is one of the important reasons for rubber aging.
The shorter the light wave, the greater the energy. It is the higher energy ultraviolet rays that damage the rubber. In addition to the UV can directly cause the rubber molecular chain fracture and cross-linking, rubber due to the absorption of light energy to produce free radicals, trigger and accelerate the oxidation chain reaction process. Ultraviolet light plays the role of heating. Another characteristic of the light effect (different from the heat effect) is that it is mainly generated on the rubber surface. For samples with high gel content, network cracks will appear on both sides, which is called "light outer layer crack".
4, the role of ozone ozone chemical active oxygen is much higher, more destructive, it is also to make the molecular chain fracture, but the role of ozone on rubber with rubber deformation or not different. When used as deformed rubber (mainly unsaturated rubber), cracks appear in the direction of stress, that is, the so-called "ozone cracking"; when acting on deformed rubber, only an oxide film is generated on the surface without cracking.
5. The role of moisture The role of moisture has two aspects: Silicone rubber products are easily damaged when they are exposed to humid air or soaked in water. This is due to the water-soluble substances in rubber and water-soluble substances such as water-soluble substances are extracted and dissolved by water. Hydrolysis or absorption and other reasons. In particular, the alternation of water immersion and atmospheric exposure accelerates the destruction of the rubber. However, in some cases, water does not damage the rubber, and even has the effect of delaying aging.
 
6. Other reasons: chemical media, variable valence metal ions, high-energy radiation, electricity and biology will also accelerate the aging of silicone products.
7, long-term work does not cause permanent deformation. For a long time under high pressure, the deformation is more obvious for products with hard materials, whether it is silicone buttons or silicone miscellaneous parts.
 
8. Effect of stretch rate. Generally, the stretching rate of silicone rubber can reach up to 300 (relatively soft material), but excessive stretching in the process of use will directly lead to deformation and loss of stretching degree permanent deformation, so in the process of use can not be excessively elongated, regardless of industrial products, daily necessities or silicone miscellaneous parts are the same.
 
9, the impact of temperature occasions. When the silicone rubber products work under humid and high temperature conditions, the stretching will gradually deform, but with the adaptation of the temperature or the temperature drop, the silicone products will also be slightly deformed. So whether it is in the industrial application of silicone rubber accessories, sealing products, or try not to let silicone products long-term stretch. To improve the performance of the raw materials of the product and maintain normal use during use, it is necessary to pay attention to the reaction of heat, light, oxygen, liquid, etc.
 
Can also be used in the production process to add a variety of antioxidants, to maintain good performance! Silicone rubber products will age due to high temperature cracking, and will lose performance due to solvent oil expansion. Any product will age, just the length of time, silicone rubber products have excellent anti-aging properties. However, attention should also be paid during use, and try to avoid exposure to light, heat, and humid environments.

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