Polyurethane material are widely used in all industry area because of its excellent properties, such as fiber, PU leather, foaming material and artificial leather etc. However, like most polymer materials, polyurethane is prone to photo-oxidative aging phenomena such as yellowing, cracking and degradation of mechanical properties in the process of outdoor use. In the process of aging, polyurethane materials will be accompanied by yellowing.
Yellowing not only affects the appearance of polyurethane materials, but also warns the changes of its structure and properties. Therefore, it is particularly important to solve the yellowing problem of polyurethane materials.
l The yellowing of polyurethane includes the following four types:
1. During processing, thermal oxidative aging and yellowing caused by high temperature.
2. Fume yellowing caused by exposure to nitrogen oxides (NOx) in air.
3. Fabric pollution.
4. Yellowing caused by exposure to ultraviolet rays.
In view of these situations, we usually recommend adding a certain amount of anti-yellowing agent and UV absorber to PU products to delay the yellowing of materials. When they are used together, the synergistic effect will produce “1 plus 1 is greater than 2 ” effect.
OMNISTAB HN-130 is a worth recommended antiyellowing agent, which belongs to amine series. It can be widely used in the production of PU profiles, shoe elastomer, plastics and polyurethane fibers to prevent yellowing during processing. In addition, it is also the first choice of anti-yellowing agent in Spandex, which can be directly used in the process of spandex fiber productio. And it can also be used as the main component of compound liquid additives, as post-finishing agent of spandex fibers.
l The main application of OMNISTAB HN-130 in plastics :
--It can be used as a gas stabilizer, which has good selectivity for nitric oxide (NO) and nitrogen dioxide (NO2), and It can prevent NOx from yellowing on the polymer surface during processing.
--It is used as anti-yellowing agent in polyurethane materials.
--It is used as a light stabilizer in polyamide materials.
--It is used as heat stabilizer in polyethylene glycol system.
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