Precautions for Storage of Polyurethane Cold Storage Panels

Prepolymers that are frequently opened and sealed have a layer of skin on their surface, which is the result of water entering the surface of the prepolymer after opening, reacting with isocyanates to produce carbon dioxide and urea.

At present, the production technology of polyether polyols and polyisocyanates in China is mostly introduced from developed countries such as Germany and the United Kingdom, which guarantees the quality of our self-developed polyether polyols and polyisocyanates.

The storage period of the pre polymer produced is similar to that of the pre polymer produced abroad, with a storage period of one year.

During the storage process of polyurethane cold storage panels, the - NCO in the prepolymer reacts with active hydrogen groups such as urea and amino acid esters in the prepolymer. Therefore, the - NCO% content must be analyzed at any time during application.

If two or more grades of polyether are used in combination, they should be stacked by grade and clearly marked.

The combined polyether with ordinary flame retardants should not be stored for too long and must be prepared and used on the same day, otherwise it may cause deterioration and affect the quality of foaming.