Precautions For The Use Of Polyurethane Prepolymer

Polyurethane prepolymer is a kind of polyurethane prepolymer based on TDI and polyether polyol. It has the characteristics of high elasticity, good abrasion resistance, low endogenous heat, and hydrolysis resistance. It has the advantages of dynamic performance requirements. obvious advantage. Products made with it have good performance in terms of resilience, low temperature properties and toughness. Moreover, it also has lower operating viscosity and longer reaction time. It has good operability when manufacturing products, is not sensitive to water vapor, short demoulding time, high yield, wide maturation conditions, etc. In addition to providing better physical properties and convenient operation, it also has an outstanding performance in ensuring environmental safety, health and hygiene.

Pay attention to sealing during use. If it cannot be used up all at once, the polyurethane prepolymer after use should be sealed and stored under nitrogen protection. At low temperatures, the prepolymer will condense into a viscous liquid filled with lard. It is not suitable to use electric heating rods, electric ovens and other equipment when heating the prepolymer, because the heating method is too concentrated and will cause local material degradation. Therefore, it is generally appropriate to heat the prepolymer at 70°C to 80°C. Do not use the prepolymer before it has melted. The uneven mixing of prepolymer and curing agent will cause partial color difference in the product.