What factors accelerate the aging of silicone gifts

Elasticity is an important factor in judging the quality of silicone products. Everyone knows that silicone products are finished products made of silicone raw materials, and silicone is a highly active adsorption material with excellent expandability. For users, elasticity is the primary consideration. of. Silicone products with high tear strength have outstanding damage resistance, long life, and are not easy to be interfered by the external environment. Silicone products with poor tear strength are generally prone to cracks during the tearing process, which causes rapid expansion of the cracks when stressed, resulting in damage. phenomenon.

Factors affecting the aging of silicone promotional gifts are:

1) oxygen

Oxygen in the silica gel promotional gifts will undergo free radical chain reaction with the molecules of the silica gel promotional gifts. The molecular chains will be broken or excessively crosslinked, which will cause the properties of the silica gel promotional gifts to change. Oxidation is one of the important reasons for the aging of silicone promotional gifts.

2) Ozone

The chemical activity of ozone is much higher than that of oxygen, and it is more destructive. It also breaks the molecular chain, but the effect of ozone on silicone promotional gifts varies with whether the silicone promotional gifts are deformed or not. When used as deformed silicone promotional gifts (mainly unsaturated silicone promotional gifts), cracks perpendicular to the direction of stress appear, so-called "ozone cracking"; when applied to deformed silicone promotional gifts, only an oxide film is formed on the surface Without cracking.

3) heat

Increasing the temperature can cause thermal cracking or thermal crosslinking of silicone promotional gifts. But the basic effect of heat is still activation. Increasing the rate of oxygen diffusion and activating the oxidation reaction, thereby accelerating the oxidation reaction speed of silica gel promotional gifts, which is a common aging phenomenon-thermal oxygen aging.

4) light

The shorter the light wave, the greater the energy. What destroys silicone promotional gifts is the high-energy ultraviolet rays. In addition to the ultraviolet rays that can directly cause the molecular chain of silica gel promotional gifts to break and crosslink, silica gel promotional gifts absorb free light to generate free radicals, which triggers and accelerates the oxidation chain reaction process. Ultraviolet light plays a role in heating. Another feature of light effect (different from heat effect) is that it mainly grows on the surface of oak. For samples with a high gel content, reticular cracks appear on both sides, so-called "light outer cracks".

5) mechanical stress

Under the repeated action of mechanical stress, the molecular chain of silica gel promotional gifts will be broken to generate free radicals, which will initiate the oxidation chain reaction and form a force chemical process. Mechanical breaking of molecular chains and mechanically activated oxidation processes. Which one prevails depends on the conditions in which it is located. In addition, ozone cracking is easily caused by stress.