First of all, there are many reasons for yellowing: manufacturers will also produce yellowing in the production process. For example, most large-diameter silicone hoses will turn yellow in use; In addition, the yellowing of silicone rubber aeration pipe diaphragm is mostly caused by improper operation in the production process. Different yellowing reasons need to be improved by different methods.

1、 The product turns yellow quickly in the process of use: the reason is that the yellowing of large-diameter silicone hose usually occurs in dry, airless, closed, high temperature, outdoor, direct ultraviolet radiation or chemical reaction environment. However, in normal environment, the yellowing speed is relatively slow and can be used for 1 ~ 5 years. Therefore, it can be determined whether the product is used in these environments first.

1. In the dry, airless and closed environment, the yellowing of large-diameter silicone hose should be improved in the storage and use environment. The storage environment of silica gel shall be ventilated and cooled. Under certain conditions, the temperature in the warehouse can be maintained at room temperature. The environment can be properly watered to maintain humidity, or cooled by an electric fan to keep the humidity of silica gel relatively stable. The yellowing of silica gel indicates that silica gel is in the process of high-speed loss and needs to be paid attention to. There are also some large-diameter silicone hoses that need to be assembled in a sealed environment. For example, when used in a sealed environment, some products will inevitably turn yellow during assembly, but the problems that can be solved by the manufacturer can be solved from the source, or the substrate or accessories can be replaced. Adding anti yellowing agent in the production process can greatly reduce yellowing.

2. Outdoor high temperature yellowing: common causes: the product is exposed to the limit value of silica gel performance, such as using 200 ° and long-term high temperature resistance, and using ordinary industrial large-diameter silicone hose (the upper limit of temperature resistance is 200), resulting in excessive operation of silica gel, which 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 silica gel. In order to completely solve the yellowing problem caused by high temperature, high temperature silica gel can be directly used instead.

In addition, the outdoor yellowing is due to the direct exposure of large-diameter silicone hose to the sun through wind and rain, and the aging is accelerated due to physical factors. Secondly, the outdoor temperature drop is also one of the influencing factors. It is recommended to avoid long-term outdoor use. If you really want to use it, you can choose bright colors such as black and yellow to delay the yellowing speed or hide the yellowing color.

3. Yellowing of products caused by chemical reaction or slightly corrosive environment: if the large-diameter silicone hose needs to contact some slightly corrosive liquids or some chemical contacts, the silica gel will also turn yellow and melt violently, which means that the silica gel cannot contact strong acids and bases. The improved method can use new silica gel material (fluorosilicone) for acid-base treatment (higher cost), which solves the problem of acid-base and naturally solves the problem of yellowing of silica gel.

Finally, another reason that affects the yellowing of large-diameter silicone hose is the problem at the production end. The storage and use environment of many customers are suitable for silica gel environment, but the yellowing speed of the product is still relatively fast, indicating that there are problems with the product itself.