Silicone rubber mold hardness reduction method

The liquid silicone rubber mold that generally uses the hardness is determined according to the condition of the product. Generally, small-sized products with complex markings require silicone rubber molds to be soft and have good resistance. Therefore, the hardness of liquid silicone rubber is relatively low. For large-sized products, the mold removal is relatively simple, so the hardness of liquid silicone rubber is relatively high. However, in practice, it is often encountered that the purchased liquid silicone rubber is not very ardent, and the hardness of the liquid silicone rubber needs to be lowered. Then how should the treatment be done to lower the hardness of the liquid silicone rubber?

The first method: silicone oil dilution method

In the liquid silicone rubber to participate in 1% silicone oil, the hardness of silicone rubber will probably decrease by about 0.9~1.1 Shore hardness. If you participate in 10% silicone oil, the hardness of silicone rubber will probably decrease by about 5 Shore hardness; but participate in silicone oil. It is not a very good method. If there is too much silicone oil in the liquid silicone rubber, it will directly damage the molecular weight of the silicone rubber, so that the manufactured silicone rubber mold will be resistant to tearing and tensile strength, which will affect the silicone rubber mold. The lifespan of the use; not only that, the silicone rubber molds produced are also very simple deformation, affecting the quality of the products produced after all. Therefore, do not advocate that novices do this. Generally, the proportion of silicone oil incorporated in the liquid silicone rubber should not exceed 5%, and the silicone oil with a higher viscosity should be incorporated as much as possible. First small dose experiments, then batch use.

The second method: concave and convex hardness liquid silicone rubber mixing method

Concave-convex hardness liquid silicone rubber mixing method, Wang Wensheng is to mix high-hardness liquid silicone rubber with low-hardness liquid silicone rubber, thereby reducing the hardness of high-hardness liquid silicone rubber. For example, a liquid silicone rubber of 20 Shore hardness is mixed with a liquid silicone rubber of 10 Shore hardness, and the hardness of the silicone rubber is about 15 Shore hardness. It is necessary to pay attention to this method because the added liquid silicone rubber cannot be mixed with the condensation type, so that the silicone rubber cannot be cured.