Why is the mixing of low hardness silicone rubber and high hardness silicone rubber uneven

Nowadays, for the silicone rubber raw materials with specific hardness, the low hardness silicone rubber and high hardness silicone rubber are usually used for neutralization and mixing to produce the ideal hardness. For example, 50% of the silicone rubber raw material at 40 ° C and 50% of the silicone rubber raw material at 60 ° C can neutralize and modulate the silicone rubber raw material at 50 ° C.

However, in the process of modulating the hardness of silicone rubber raw materials, if the hardness difference between the two is too large, there will still be silicone rubber particles with high hardness in the rubber, resulting in uneven mixing. For example, such a phenomenon can occur when 30 degree silicone rubber is mixed with 70 degree silicone rubber. The reason is that low hardness silicone rubber and high hardness silicone rubber can not be fully cross-linked. One degree is too hard and the other degree is too high, just like water and stone can not be fully mixed together.

If such a phenomenon occurs, how can we solve it? The only solution is to adjust the thickness of the open mill to 1-3mm, which can be solved by mixing for a long time. Or when it is not put into use, first mix the high hardness silicone rubber, and then gradually add the low hardness silicone rubber to complete the refining.

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