Nowadays,silicone product yellowing is a common issue as silicone items become ubiquitous in the market. From daily necessities to medical food products and industrial equipment, common items like silicone tubes and pacifiers often face this issue after long-term use.
However, many users and manufacturers encounter this tricky problem. This not only affects the appearance but also makes consumers doubt the quality of the product.
As a professional vertical silicone injection molding machine manufacturer, we analyze the causes and provide solutions from both the production source and daily maintenance perspectives.
Why does silicone product yellowing occur?
Before finding a solution, we need to understand the root cause. The primary reason for this phenomenon is oxidation.
During long-term use, or if stored improperly after production, silicone products are frequently exposed to the air. The chemical components in the silicone material react with oxygen in the air. When combined with exposure to ultraviolet rays (sunlight), this causes changes in the internal molecular structure, leading to obvious silicone product yellowing.
Manufacturer Perspective: How to solve yellowing at the production source
As experts, we know that preventing silicone product yellowing requires control through three key steps in the manufacturing process:
1. Select high-quality raw materials
The raw material is the foundation. If the purity of the base material itself is insufficient, even the best processing techniques cannot save it. When producing high-quality transparent products, high-transparency and high-quality silicone raw materials must be used. These materials have stronger oxidation resistance and better light transmittance, physically delaying the occurrence of yellowing.
2. Chemical intervention: Add anti-yellowing vulcanizing agents
The choice of additives during the mixing process of silicone raw materials is crucial. To prevent the product from turning yellow later, vulcanizing agents with anti-yellowing properties (such as specific anti-yellowing catalysts) need to be added to the formula. These agents can effectively inhibit the oxidation reaction of silicone during the vulcanization process and subsequent use.
3. Technical control: Precisely control mold temperature and vulcanization time
This is where the vertical silicone injection molding machine plays a key role. The machine’s parameter settings directly affect product quality:
- Mold Temperature: If the temperature is too high, it will cause the silicone to scorch and turn yellow; if it is too low, vulcanization will be incomplete.
- Vulcanization Time: Excessive time will also accelerate aging and yellowing. Through the precise temperature control system and timing settings of the vertical silicone machine, manufacturers can ensure that the silicone is molded in its optimal state, avoiding internal yellowing caused by “over-cooking.”
Consumer Perspective: Daily remedies after silicone turns yellow
If your silicone pacifier or phone case has already started to turn yellow, besides replacing it with a new one, you can also try the following physical cleaning methods to alleviate it:
- Toothpaste Cleaning: Apply toothpaste to the yellowed area and scrub gently with a soft brush. The abrasives in toothpaste can help remove the surface oxidation layer.
- Detergent Soaking: Soak in warm water with neutral detergent and then wipe clean to remove surface grease and attachments.
- Alcohol Wiping: Alcohol has good volatility and stain-removing capabilities, which can clean the silicone surface.
Special Reminder: After cleaning and drying, be sure to avoid direct sunlight. Ultraviolet rays are the main culprit in accelerating silicone aging and yellowing.
Summary
In general, the yellowing phenomenon of transparent silicone products is a natural law of material aging. Through the raw material control and process optimization by the vertical silicone injection molding machine manufacturer on the production end, combined with correct maintenance by the user, we can only alleviate and delay this process to the greatest extent, but cannot completely avoid it. For products with extremely high appearance requirements, regular replacement is recommended to ensure the best user experience.
