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The main synthesis method of waterborne polyurethane-prepolymer method!

 Last Update: 2021-06-16
 Source: Internet
 Author: User

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The resonance formula of -NCO is shown in Figure (1).

figure 1

figure 2

image 3

Prepolymer method

The prepolymer method is also called the emulsification method, which introduces hydrophilic groups into the PU prepolymer terminated by -NCO, and uses a small amount of organic solvent to reduce the viscosity of the polymer during the synthesis process

In order to successfully apply this method, on the one hand, it is necessary to control the viscosity of the prepolymer.

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