Functionality Mannich polyols

The viscosity of the final Mannich polyol depends on the functionalities of the resulting Mannich bases (lower functionalities lead to lower viscosities) and on the molar ratio between the reacted PO/mol of the Mannich base. Figure 15.2 shows the variation of the Mannich polyol viscosities as a function of the molar ratio of the PO/Mannich base (Mannich base from 1 mol of nonyl-phenol, 2 mols of formaldehyde and 2 mols of diethanolamine). One observes that after the addition of one PO mol/mol of Mannich base a maximum of viscosity is obtained and by the addition of 2-5 mols of PO the viscosity decreases continuously. 

Figure 15.2 Variation of Mannich polyol s viscosity as function of molar ratio PO/Mannich base, [nonyl-phenol] [formaldehyde] [diethanolamine] = 1 2 2...

The approximate functionality of Mannich polyols is calculated with the following formula ... 

A Mannich polyol based on nonyl phenol and oxazolidine with a functionality of 5 OH groups/mol has the following molar ratios ... 

Figure 15.4 Variation of Mannich polyol s viscosity as function of the molar ratio of PO/Mannich base made by classic Mannich reaction (O) and by oxazolidine route ( ) [nonyl-phenol] [formaldehyde] [diethanolamine] = 1 2 2 (O) [nonylphenol] [oxazolidine] = 1 2 ( )...

The functionality of Mannich polyols obtained by oxazolidine technology is given by the formula 15.22 ... 

A very interesting Mannich polyol, of low functionality (f = 3.5 OH groups/mol) and low hydroxyl number (OH = 325 mg KOH/g), derived from nonyl phenol was developed successfully for all water blown rigid PU foams [19]. 

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