Polymers are prone to yellowing in the process of processing and use, and the most fundamental reason for yellowing is the instability of polymer structure, which is easily affected by light, oxidation, high temperature and so on.Some polymers are sensitive to light, light stabilizers protect against the effects of light, others are sensitive to oxidation, antioxidants protect against oxidative yellowing, and yellowing resistance agents may be specific to one or more of them.
Polyurethane, which is a polymer containing a carbamate group in the main chain of a large molecule, is called polycarbamate, or polyurethane for short.Since the groups contained in the polyurethane macromolecules are highly polar groups, and the macromolecules also contain polyether or polyester flexible chain segments, polyurethane has the following characteristics:
（1）High mechanical strength and oxidation stability;
（2）With high flexibility and resilience;
（3）with excellent oil resistance, solvent resistance, water resistance and fire resistance.
Polyurethane has many excellent properties, so it has a wide range of applications.
Polyurethane is mainly used in polyurethane synthetic leather, polyurethane foam, polyurethane coating, polyurethane adhesive, polyurethane rubber (elastomer) and polyurethane fiber.In addition, polyurethane is also used in civil engineering, address drilling, mining and petroleum engineering, to block water, stabilize buildings or subgrade role;As pavement material, it is one of the most widely used polymer materials at present.
The reasons for the yellowing of polymer are: during processing, the yellowing of thermal oxygen aging caused by high temperature;Yellowing caused by exposure to nitrogen oxides (NOx) in the air;Yellowing caused by exposure to ultraviolet light.Due to the structure of polyurethane contains not only the amino group which is easy to be oxidized and yellowing, but also the unsaturated bond which is easy to occur ultraviolet yellowing, the phenomenon of yellowing easily occurs in the use of polyurethane products, and the anti-yellowing agent is also an indispensable small material in the additives of polyurethane products.
At present, our company has launched two anti-yellower agents OMNISTAB HN130 and OMNISTAB HN150 for polyurethane.HN130 and HN150 are amine yellowing resistant agent, can be widely used in polyurethane material, shoes material, plastic and paper fiber products such as production process, prevent yellowing phenomenon in machining process, the product can also be used as antioxidant agent, stabilizer, and can participate in polymerization, can also be used in polyurethane coatings used as resistance to yellowing agent.
Deltachem is committed to the production of high-quality anti-yellowing agent products, we have a professional research and development team, rigorous production team and strong service team, can provide you with better quality products and more perfect service.For more detailed information about anti-yellowing agent, please contact our business personnel or log on the company website and telephone for consultation.Qingdao dedazhi become your plastic products escort!
