Reaction of formaldehyde with lignin

The most practical way to avoid unreacted lignin in a finished formaldehyde-bearing adhesive is to form the more reactive methylol lignins. Some lignins take 90 minutes to react with formaldehyde at 75?C and others show gel particles after 30 minutes reaction under the same conditions. This work reports a lignin-formaldehyde reactivity test that can be used to identify potential lignins to partially replace phenol in phenol-formaldehyde resins.

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