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Phenol Formaldehyde Compositions for Wood Binders - Particleboard Core

Adhesives Formulation

Applicable Type

Waterborne Adhesives

Applicable Base Polymer

Phenol Formaldehydes

Applicable Industrial Sectors

Wood & Related Industries

Applicable Base Polymer Properties

One of the most common wood adhesives is based on the reaction of formaldehyde with phenol. The properties vary depending on the coreactant with the formaldehyde. Phenol formaldehyde polymers are widely used in both wood laminations (plywood) and composites (flakeboard) because of their outstanding durability, which derives from their good adhesion to wood, the high strength of the polymer, and the excellent stability of the adhesive. In general, phenol formaldehyde adhesive can meet the bonding needs for most wood applications if cost and heat curing times are not an issue.

Typical Formulation Ingredients

Ingredient

Parts by weight

Phenol formaldehyde resin (8-10% alkali content)

xxx

Potash 50%

(Source: Petrie, E.M., “Adhesive Binders for Wood Composites”, SpecialChem, January 17, 2011.)

Typical Properties

Properties

• High in wet and dry strength

• Good balance of cost and water resistance

• Resistant to high temperature and chemicals

• Resistant to moisture

• Hot pressing at 125°-150°C

• Dark red color

Processing

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Resulting Properties

Phenol formaldehyde wood adhesives exhibit very high dry and wet strength and are resistant to long term exposure to moisture. The adhesive is often considered to be more resistant than wood to high temperatures and chemicals. One of the disadvantages is that the adhesive is a dark red color. These adhesives can be cured by hot pressing at temperatures between 125° and 150°C, but they can also be manufactured to cure at lower temperatures including room temperature if optimum properties are not required.

Tips and Tricks

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