Is The Whitening Of Rubber Sealing Rings A Quality Issue?

The whitening of rubber sealing rings is not a quality issue, but a phenomenon known as "spraying frost" or "spraying wax". The following is a detailed explanation of the whitening phenomenon of rubber sealing rings:
1, Frost and wax spraying phenomenon
Frost spray:
Frost spraying is a phenomenon in which liquid or solid additives in rubber materials migrate from the inside of the rubber to the surface of the rubber after being left for a period of time.
The main reason for frosting is that there are too many components in the rubber material formula, especially accelerators or vulcanizing agents, which cause false saturation vulcanization of rubber. At natural temperature, molecules are still cross-linking, and after cross-linking is complete, excess substances will precipitate on the surface, forming product surface frost.
Spray wax:
Spray wax is the precipitation of wax like substances such as paraffin and ground wax on the surface of rubber, forming a wax film.
In some rubber product formulations, the amount of paraffin wax is intentionally increased to allow it to spray onto the surface during later use, forming a protective wax substance.
2, Reasons for whitening phenomenon
Formula issue:
The whitening of rubber sealing rings is closely related to the formula of rubber materials. Unreasonable ingredients and ratios in the formula, or excessive amounts of certain ingredients, can all lead to whitening.
Process issues:
Problems with the production process of rubber products, such as short sulfurization time and high temperature settings, may also lead to whitening.
Storage conditions:
During storage, if the conditions are not appropriate (such as high temperature, high humidity, etc.), rubber seals may also cause whitening.
3, Solution
Secondary vulcanization:
The current direct solution is to pass the rubber sealing ring through the oven again for secondary vulcanization. But this method cannot fundamentally solve the problem of rubber sealing rings turning white.
Adjust formula:
Regarding the whitening phenomenon, adjustments can be made to the rubber material formula. By reducing the amount of certain ingredients or increasing the amount of certain additives, the whitening phenomenon can be improved.
Improve the process:
Optimize production process parameters, such as adjusting vulcanization time, temperature, etc., to reduce the occurrence of whitening phenomenon.
Use anti frost agent:
Adding anti frost products to rubber formulas can effectively prevent the occurrence of whitening of rubber seals.
4, Precautions
Determine the whitening substance:
When dealing with whitening phenomena, it is first necessary to determine what whitening substances are (such as zinc oxide, calcium carbonate, etc.) in order to carry out targeted treatment.
Overall consideration:
When solving the problem of rubber sealing rings turning white, it is necessary to comprehensively consider multiple factors such as formula, process, and storage conditions, and improve from multiple aspects.
The whitening of rubber sealing rings is caused by frost or wax spraying, which is related to factors such as formula, process, and storage conditions. By adjusting the formula, improving the process, and using anti frost agents, the problem of rubber sealing rings turning white can be effectively prevented and solved.