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Sponge manufacturers analyze the causes of sponge yellowing
Release time:
2020-11-23 16:39
What are the reasons for the analysis of sponge manufacturers causing the sponge to turn yellow:
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General polyether polyol manufacturers will increase a certain amount of antioxidants in polyether polyols, which is intended to better ensure the safety of the production of dirty polyurethane foam manufacturers in the application of polyether polyol polyurethane foaming process. At present, the main types of antioxidants used by Chinese methacrylate manufacturers are BHT and allylamine antioxidants or mixed antioxidant system software of thiacyanide. However, the world's famous methacrylate manufacturers mainly use some large-content antioxidants of hindered phenolic compounds, IRGANOX with allylamine antioxidants, such as Ciba®1135 (antioxidant with large content of phenolic compounds), and IRGANOX®5057 (allylamine antioxidant) is included in this type of system.
However, as a manufacturer of sponge large shopping malls, when obtaining a polyether polyol, apart from thinking about safety, cost and polyurethane foaming effect, it is very rare to evaluate the harm of antioxidants in polyether polyol to the yellowing of sponge in the system. And this is often our careless factors, but hide the key reasons for the harm of sponge yellowing.
In general, under ideal circumstances, the antioxidants stored in polyether polyols can promote the brittle dissolution of high polymers due to the high temperature generated by polyurethane foaming itself during the foaming process of sponge polyurethane, which not only ensures the safety production of sponge polyurethane foaming process, but also effectively prevents the core of sponge polyurethane foaming process from turning yellow. However, following the completion of sponge polyurethane foaming, the antioxidant remaining in the sponge simply causes many sponges to turn yellow.
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