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Transparent silicone products do not turn yellow after a few years of normal placement, but sometimes in production, some just-released transparent silicone products look yellow, as if the color has changed. Why transparent silicone products will turn yellow?
I. Sulfurizing agent
The performance of vulcanizing agent is divided into general type and anti-yellowing.
1. General type non-yellowing vulcanizing agent can be used for non-exposed silicone products with darker color or lower color requirements.
2. Anti-yellowing vulcanizing agent is used for goods that need to be exposed, light color, gorgeous color and high color requirements.
Process
Transparent silicone products molding, production process control is not good, resulting in transparent silicone products molded in yellow color. The main problems are:
1. Mold temperature is too high
2. Too long vulcanization time
Third, after the second addition of sulfur
The raw material itself is too poor quality
Sometimes we add anti-yellowing vulcanizing agent in the glue, but the transparent silicone products still look yellow after molding, this may be the raw material is too poor in anti-yellowing, because the raw material is very poor in anti-yellowing, it is recommended to directly replace the material.
Summarize:
Although silicone products have excellent weathering and aging resistance. However, sometimes the newly released silicone products are still yellow. In order to prevent this situation, the vulcanizing agent should be selected according to the need, the mold temperature and product vulcanization time should be strictly checked, and attention should be paid to the selection of special anti-yellowing raw materials.
I. Sulfurizing agent
The performance of vulcanizing agent is divided into general type and anti-yellowing.
1. General type non-yellowing vulcanizing agent can be used for non-exposed silicone products with darker color or lower color requirements.
2. Anti-yellowing vulcanizing agent is used for goods that need to be exposed, light color, gorgeous color and high color requirements.
Process
Transparent silicone products molding, production process control is not good, resulting in transparent silicone products molded in yellow color. The main problems are:
1. Mold temperature is too high
2. Too long vulcanization time
Third, after the second addition of sulfur
The raw material itself is too poor quality
Sometimes we add anti-yellowing vulcanizing agent in the glue, but the transparent silicone products still look yellow after molding, this may be the raw material is too poor in anti-yellowing, because the raw material is very poor in anti-yellowing, it is recommended to directly replace the material.
Summarize:
Although silicone products have excellent weathering and aging resistance. However, sometimes the newly released silicone products are still yellow. In order to prevent this situation, the vulcanizing agent should be selected according to the need, the mold temperature and product vulcanization time should be strictly checked, and attention should be paid to the selection of special anti-yellowing raw materials.
