Many rubber products manufacturers may encounter such a problem. During the summer rainy season, many silicone rubber products such as rubber sheets and soles will appear water droplets. After the water droplets evaporate, the surface will also appear dotted and white. Point, similar to the phenomenon of "spitting frost"; this problem is very headache,
The cause of water column frosting on the surface of rubber products is mainly caused by the excessive use of alcohols, especially DEG; because DEG has a strong side effect of moisture absorption. When the amount of DEG in the formula is too large, it will absorb moisture, which is more obvious in summer or the rainy season. Therefore, there are many kinds of cases in summer.
The so-called "spitting frost" is: on the surface of rubber products after moisture absorption, water droplets will dissolve the water-soluble substances in the formula; after the water evaporates, the water-soluble substances will remain on the rubber surface. These white spots can be wiped off by hand.
Therefore, if you want to fundamentally deal with problems such as water drops on the surface of rubber products, the most important thing is to start from the formula, such as changing the formula or paying attention to the amount of alcohol. Secondly, rubber products can be placed in a dry and ventilated environment to ensure that the products are dry.