Reasons for yellowing of transparent silicone products
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Normal transparent silicone products will not yellow for a few years, but sometimes we are in production, some of the transparent silicone products that have just been formed will turn yellow. What are the reasons for the yellowing of transparent silicone products? Silicone products custom experts to answer for you, the reason for the yellowing of transparent silicone products may be caused by the following aspects.
1) Vulcanizing agent
1. The performance of vulcanizing agent is divided into common type and anti-yellow property. Its application range has the following two aspects:
A. Ordinary type is not resistant to yellow vulcanizing agent, and can be applied to some non-exposed silicone products which can be used for dark color or low color requirements.
B. Anti-yellow vulcanizing agent is applied to products that need to be exposed, lighter in color and more vivid, and have higher color requirements. The quality of vulcanizing agent is highly correlated with hydrogen-containing silicone oil. The vulcanizing agent we use has a hydrogen content of 1.6. Above; the acid value is below 1 and the effect is better.
2) Process aspects
When the transparent silicone product is molded, the color of the transparent silicone product turns yellow after molding. There are mainly problems:
A. The mold temperature is too high;
B. The curing time is too long;
C. Secondary sulfur addition.
If you purchase the products we produce, the above problems will not occur. Our mold temperature is checked once every 15 minutes. If the mold temperature is too high or too low, the production will stop immediately. After the temperature returns to normal, the production can continue.
3) The quality of the raw materials themselves is too bad.
Sometimes we add anti-yellow vulcanizing agent to the rubber compound, but the transparent silica gel product still looks yellowish after molding. It may be that the yellowing resistance of the raw material is too bad. Our quality is serious. The above problems will not appear in us. Please rest assured to buy.
