People who know some silicone products should know that they feel soft, and some products made by silicone key manufacturers will harden, because the hardness of silicone determines its physical properties. However, for those who use silicone for the first time or need to make silicone products for the first time, they don't know much about the hardness of silicone, There is also uncertainty about the hardness of the seal.


Method 1: the relatively high hardness silica gel and the relatively low hardness silica gel are mixed in a certain proportion. Generally, the silica gel above 50 ℃ and the silica gel above 30 ℃ are mixed. In the relatively hard silica gel, the hardness of the silica gel rubber products is about 40 ℃.


Method 2: we can usually use silicone oil to reduce the hardness of silica gel, but in practical application, if the addition of silicone oil ratio can damage the molecular weight, tear resistance, tensile strength of silica gel, the corresponding deterioration of rubber keys will occur, which will affect the life of silica gel mold. In addition, too much silicone oil will make the silicone rubber mold easy to deform, Therefore, generally, the ratio of silicone oil to silicone oil is not more than 5%. Try to add silicone oil with higher viscosity. If the content of silicone oil is more than 5%, use a small amount to determine whether it can be used.


Now, with the continuous improvement of technology, silicone products are more and more widely used in daily life. However, it is worth mentioning that some smell often appears. Many people feel puzzled and don't know what to do. In fact, it has something to do with the production and the use of silicone products. O-ring silicone is more and more popular because of its environmental performance, To understand the knowledge of silica gel products, we must start with silica gel raw materials.


The cause of smell of silica gel products.


If it's the problem of raw materials for silk screen printing, it's natural to consider how to make the taste of raw materials smaller or even disappear. Usually, the products can be dispersed in the production process and blown by a large fan, which can effectively reduce the taste of silicone products.


Secondly, the smell of silicone products is also associated with the seal ring of hand feel oil, which may surprise people. Some hand feel oil does not have a strong smell originally, but after the injection operation, it will produce a strong smell. When it is dispersed or blown, it will not change after a period of time, In this case, we need to consider the type of hand feeling oil.


The peculiar smell of silica gel products is also related to sulfur (chemical symbol: s) curing agent. The composition and formula of curing agent may also lead to peculiar smell of products, and the proportion of this reason is relatively large. The factory element of sulfur based silica gel products itself has a smell. If the process is not handled properly, it is likely to have a bad smell, which is naturally unacceptable to ordinary users.