The moisture content in polyether polyols has a significant impact on their properties.
As a foaming agent, water reacts with isocyanate (TDI) to produce gas and heat.
The right amount of water can speed up the reaction speed, but too much water will cause the consumption of TDI to increase, thereby reducing the activity of the polyether, which may cause cracking or collapse.
If the moisture in the polyether seriously exceeds the standard, the urea bond and carbon dioxide will increase, the foam density will become smaller, the foam product will harden, and a lot of heat will be released.If the heat generated cannot be removed quickly, it will cause yellow heart and even fire in severe cases.
Therefore, in the polyether production process, the moisture content should be reduced as much as possible to ensure the quality and performance of the final product.
conclusion
Moisture analysis in polyether polyols is an important part of controlling their quality.Through methods such as differential scanning calorimetry, high-frequency spectroscopy, and Karl Fischer titration, the moisture content and presence form of polyether polyols can be accurately determined.In the production and use of polyether, the moisture content should be strictly controlled, which helps to ensure the stable performance of the foam and avoid quality problems and safety issues caused by excessive moisture.