There is a direct link between the transparency of the key glue and the transparency of the white carbon, you can choose the better transparency of the white carbon.

In terms of formula and process, the transparency of the compound is not good. It is clear that the hydroxyl on the surface of carbon black is not completely treated, which affects the transparency of the compound. That is to say, the hydroxyl silicone oil we add is not treated enough on the surface of white carbon black, indicating that there are some pseudohydroxyl in the hydroxyl silicone oil. In the process of vacuumization or heat treatment, a part of the substance that does not participate in the reaction is withdrawn; Also said understand carbon black and rubber molecules combined with incomplete or in combination with enough time, you can make adjustment from the process, the raw rubber mixing, and white carbon black first room temperature formula on using hydroxyl silicone oil and alkoxy silane used white carbon black surface hydroxyl, at about 8 hours 30 ~ 40 ℃ curing, vacuum processing again, This will improve the transparency of the glue.

At the same time, the key glue, in addition to the physical performance of the detection, but also to control the key force and fatigue life, we can use instruments to test, the index of the control in a certain range.

Structural type is due to the hydrophilic silica rubber and rubber mixing into rubber, harden in the process of storage, the plasticity is reduced, and the gradual loss of smelting and processing of process performance, production is the main cause of structured because the surface of white carbon black and silica in rubber molecules key or raw rubber molecules hydroxyl-terminated generated hydrogen bonding, and chemical combination, The linear polysiloxane is transformed into pseudo cross-linked semi-elastic solid structure, which reduces the solubility of the compound and increases the gel content.

Generally speaking, the plasticity of the compound can be restored by rerefining, and the length of the rerefining time depends on the severity of the structure of the compound. In order to reduce the hydrogen bonding of the rubber, reducing the level of rubber structured can join structure control agents, such as hydroxyl silicone oil, diphenyl silicone glycol or alkoxy silane, at the same time also can join the right amount of dimethyl silicone oil to adjust flow performance, the rubber to join in too much of the hydroxyl silicone oil can lead to feel sticky and vulcanizing speed slow, This is about to find a suitable balance point, each type of rubber can be controlled in a appropriate plastic value range, plasticity index on the low side or on the high side of the late affects products processing, plastic value is low, the machining process will be a sticky roller, in the production of products may occur in the process of mucous membrane or bad scar phenomenon; The plastic value is high, will cause the structure of the glue and the poor fluidity of the glue, the product may be lack of glue or flow marks.