Why do Silicone Hoses Turn Yellow?
Most of the reasons for the yellowing of silicone hoses occur in dry, unventilated, closed, high temperature, outdoor, direct ultraviolet radiation or chemical reaction environments, but in normal environments, the yellowing speed is relatively slow, and can be used for 1 to 5 years. So you can first determine if the product is used in these environments.
1. In a dry, unventilated, closed environment, the yellowing of large-caliber silicone hoses should be improved in the storage environment and the use environment. The silicone storage environment should be ventilated and cooled. Under conditions, the temperature drop in the warehouse can be maintained at room temperature. The warehouse environment can be properly watered to maintain humidity, or the electric fan can be cooled to keep the humidity of the silica gel relatively stable. The yellowing of the silica gel indicates that the silica gel is in the process of high-speed loss and needs to be highly valued. There are also some large-diameter silicone tubes that need to be assembled in a closed environment, such as sealed use, assembly is inevitable yellowing in certain products, but the problem can be solved from the source and can be heard by the manufacturer, and the substrate or accessories can be replaced. Adding anti-yellowing agents in the production process can greatly reduce yellowing.
2. Yellowing at high temperature outdoor: Usually this reason is the product’s exposure to the limit value of silicone performance, such as the use of 200 ° high temperature resistance and long-term high temperature resistance, the use of ordinary industrial-grade large-caliber silicone hose (temperature resistance upper limit 200 °), resulting in silicone Excessive operation is an important reason to accelerate the yellowing speed of silica gel. The improved method can not only control the cost, but also reduce the yellowing speed of the silica gel. To completely solve the problem of yellowing caused by high temperature, high temperature silica gel can be used instead. In addition, outdoor yellowing is due to the large-caliber silicone hose directly exposed to the sun through wind and rain, leading to accelerated physical factors. Secondly, the decline in outdoor temperature is also one of the affecting factors. It is recommended to avoid long-term outdoor use or choose bright colors such as black and yellow To slow down the yellowing rate or to block the yellowing color.
3. The product is yellowed under chemical reaction or slightly corrosive environment: If the large-diameter silicone hose needs to be in contact with some slightly corrosive liquid or some chemical contacts, the silicone will also have yellowing, severe melting and other bad conditions, indicating that the silicone cannot Exposure to strong acids and bases. The improved method can adopt a new type of silica gel material (fluorine silica gel), which is used for acid and alkali (high cost) to solve the acid and alkali problem, thereby naturally solving the problem of yellowing of the silica gel.