Why do rubber products become so long that they seem to melt and become sticky on the surface?
Rubber is a word now often refers to natural rubber, it can be said that not all products are easy to sticky rubber. Natural rubber tends to stick because it contains many carbon carbon double bonds and is prone to oxidation.
The main reason for the melting of rubber products is the long usage time or the long time of placing rubber;"Sticky" is because the rubber in the presence of oxygen oxidation reaction, the result is hydroxyl, carboxyl and other polar groups increased. These polar groups are the cause of the sticking of things. In layman's terms, it's equivalent to becoming a self-adhesive.
If the solvent is tacky, the reason why the rubber is not involved in the crosslinking is dissolved. Rubber products are generally crosslinked, and the crosslinked part is the main part of rubber. It only swells and dissolves under the action of solvent. If this is the case, it will not stick when the solvent is dry.
