natural rubber? True and false silicone?

The naturalization process of natural rubber* is the process of chemical cross-linking reaction of rubber macromolecular chains. It can be roughly divided into 3 stages:

The first phase is the induction phase, where the molecule and the accelerator system (promoters, zinc oxide, stearic acid) react to produce a more active intermediate compound. This method further triggers the free crosslinking of rubber molecular chains. base.

The second stage is the cross-linking reaction stage, in which a chain reaction occurs between the cross-linkable free radical and the drug molecule chain, and a cross-linking chain is generated.

The third stage is the formation phase of the network. At the same time, reactions such as rearrangement and cleavage of the crosslinks may occur. At the end of this stage, the cross-linking reaction has basically stopped, followed by the rearrangement and cleavage of the crosslinks. Reaction (ie, "return to the original" reaction).

Ordinary chemical systems often produce more unstable multi-*crosslinks in the process of cross-linking. They often show thermal instability compared to single cross-links, and appear to be the largest After the torque increases with the extension of the time, the torque gradually decreases. How to identify true and false silicone rubber wristband?

How to distinguish from appearance and feel:

1, fake silicone rubber wristband is easy to deform, and really silicone rubber will feel good rebound, pull pull permanent deformation is relatively small.

2. True silicone rubber If the surface layer is not specially treated, the hand will feel smooth when it touches it, because there will be a layer of grease-like substance on the surface layer.

3, silicone rubber surface is easy to stick dust, hair and the like impurities.

Contrast of burning place:

The fake silicone rubber wristband is black after the fire edge, but no matter what color the silicone burning edge is white, the burning residue is powder.

Burning contrast:

The fake silicone rubber wristband burns open flames, smoke is black, and there is odor. The real silicon rubber wristband is carbon-like and has a uniform flame. White smoke, odorless.