Anti yellowing agents

januari 13, 2020
blog

We launched two anti yellowing agents, Omnistab HN 130 & Omnistab HN 150. Both are highly suitable for polyurethane applications, which we will introduce in this article.

Polymers are prone to turn yellow during processing. Moreover, the most fundamental reason of yellowing is the stability of the polymer structure. For example, oxidation and high temperature will effect the structure. Firstly, some polymers are sensitive to light and light stabilizers will protect them. Secondly, some polymers are sensitive to oxidation and anti-oxidants will protect them. That sounds logical, right? So why do you need an anti-yellowing agent for polyurethane?

Polyurethane

Polyurethane contains an urethane group in the main chain of the macromolecule. Because the groups, contained in the macromolecule of the polyurethane, are all high polar groups. And it also contains a polyether or a polyester soft segment, polyurethane has the following characteristics:

  1. High mechanical strength and oxidation stability
  2. High flexibility and resilience
  3. Excellent resistance against oil, solvents, water and fire

We emphasize three reasons for yellowing of the polymer are. Yellowing of hot oxygen aging caused by high temperature during processing. Further, yellowing caused by exposure to nitrogen oxides (NOx) in the air. Likewise, yellowing caused by exposure to UV rays. The polyurethane structure contains an amino group, which is easily oxidized and yellowed. Next to that, an unsaturated bond, which is prone to ultraviolet yellowing. To sum up, the polyurethane product is highly susceptible to yellowing during use. With these characteristics, polyurethane has a wide range of uses;

  1. polyurethane synthetic leather
  2. polyurethane foam, polyurethane coating
  3. polyurethane adhesive
  4. urethane rubber (elastomer)
  5. polyurethane fiber

Polyurethane is used in civil engineering, address drilling, mining and petroleum engineering to block water, stabilize buildings or subgrades; as paving materials, for runways in sports fields, indoor floors of buildings.

New products

Omnistab HN 130 and Omnistab HN 150 are amine anti-yellowing agents, which can be widely used in the production of polyurethane applications. For example, PU profiles, shoe materials, plastics and rolled paper fibers to prevent yellowing during processing. The products are also commonly used as antioxidants, as a stabilizer and can participate in polymerization. It is also used as an anti-yellowing agent in polyurethane coatings. The main difference between the two products is the molecular weight and melting range.

If you need more info, please send us your request and our technical team is ready to answer all your questions!

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