How to ensure the concentration of polyurethane prepolymer raw materials?

 

In reality, many products we use have very strict requirements and regulations when they are prepared, and various operations on the raw materials are very strict. When we produce polyurethane prepolymers, sometimes we need to use the raw materials. Concentration, so how is this done?

1. When concentrating the raw materials of the polyurethane prepolymer, the rubber particles should be appropriately large. According to the use situation, the requirements of the raw materials should not be accommodated. Adjust them during the concentration of the polyurethane products.

2. Storage stability period, at least one year. Among these three aspects, the rubber particles of the raw material of the polyurethane prepolymer should be the main one, especially when the concentration is higher, the larger the particle size is required.

3. Another point is that if there is no gel at that time, there will be small particle size and high viscosity, which will not be widely used and have little application value. The pressure concentration method is to first increase the particle size by pressurizing and heating treatment, and then to evaporate and concentrate to prepare a high-concentration polyurethane prepolymer raw material.

These operations first require us to ensure that the raw materials are reasonable, and then we must observe and pay more attention to the places that are prone to problems in the treatment, especially the handling of the rubber particles and the changes in concentration.