Wood & Furniture

Development of phenol-urea-formaldehyde resins (PUF resins) by co-polymerisation to extend the range of applications in chip and fibre board production

Attempts to synthesize PUF adhesives were based on homogeneous and heterogeneous catalytic processes. The method developed is not considered prone to faults. The technical application of PUF adhesives in areas other than the timber sector, such as the rubber, glass and mineral wool sectors, seems possible.

Summary

Adhesives based on urea-reinforced phenol-formaldehyde resins are already used in industry. However, they are currently not suitable for use in the chip and fibre board industry. 

This project was aimed at improving the synthesis of a genuine PUF co-polymer that can be used as an adhesive in the timber material industry. The work was based on the experience and descriptions of two internationally renowned work groups from France and Japan. 

Results: 

According to these experiences, it is not possible to synthesise a genuine co-polymer from urea, phenol and formaldehyde in the way described in the literature. 

A completely new synthesis path was independently developed, which made it possible to synthesise an adhesive-like product. 

The polymer analysis method developed in parallel (GPC, NMR) could be applied to prove that a genuine co-polymer made of urea, phenol and formaldehyde had been produced. No significant amounts of free phenol and no urea could be detected in the polymer matrix of the condensation product.

In addition, some technical characteristics of the adhesive-like polymer were determined. They provide initial information as to which product characteristics can be expected of PUF adhesives.

More Project Informations

Project title:  Development of phenol-urea-formaldehyde resins (PUF resins) by co-polymerisation to extend the range of applications in chip and fibre board production

Project number:  0339830/0

Project period:  1999 - 2002

Project region:  Germany (Lower Saxony)

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Source: German National Library of Science and Technology Hannover (TIB)