pH control of the condensation reaction and its effect on the properties of formaldehyde/urea resins |
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| Authors: | M. Szesztay,Zs. L szl -Hedvig,C. Tak cs,E. G cs-Baitz,P. Nagy,F. Tü d&#x s |
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| Affiliation: | M. Szesztay,Zs. László-Hedvig,C. Takács,E. Gács-Baitz,P. Nagy,F. Tüdős |
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| Abstract: | The conditions of the preparation of formaldehyde/urea (F/U) resins have been supervised with the aim to reduce formaldehyde emission by influencing the ratio of methylene/dimethylene-ether-bridge linkages in the product. The most crucial point of this task is to keep the pH values of the reacting mixtures on the required level. The effect of formic acid, unevitably present in industrial formaldehyde solutions, was neutralized by applying a new buffer system, containing boric acid and ethylene glycol. |
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