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Phenolic Resin Is Also Used In Large Quantities To Impregnate The Epoxy Used For The Bottom Layer Of Decorative Boards

Jun 15, 2020

  Phenols (mainly phenol, resorcinol, cresol) and formaldehyde resin polycondensation reaction resin used in wood processing is mainly thermosetting phenolic resin. Due to different catalysts, the properties of the resins produced are also different. If ammonium hydroxide is used as a catalyst, an alcohol-soluble resin can be prepared, which is mainly used to impregnate sulfate paper as a glue film; if sodium hydroxide is used as a catalyst, it is made into a water-soluble resin; The molecular weight of the resin is also different.

  The reaction temperature and reaction time also have an effect on the properties of the resin. Phenolic resin glue has good boiling water resistance and weather resistance. Its products belong to a class of high water resistance outdoor products, which are used in aircraft, ships, and building components. Mainly used hot pressing (temperature 125 ~ 150 ℃), pressurizing time is longer than urea-formaldehyde resin glue, but by adding resorcinol or hardwood tannin extract or adding some blood powder and improving the manufacturing process and other measures can shorten the pressurizing time.

   If it is polycondensed under alkaline and then polycondensed under acid, a high molecular weight resin can be obtained, which is insoluble in water, and natural resin or polyvinyl alcohol can be added to make it into an emulsion. Phenolic resins are also widely used for impregnating the kraft paper used for the bottom layer of decorative boards. In order to make the impregnated paper tough, generally add cresol or xylenol with phenol and formaldehyde co-condensation. Resorcinol formaldehyde resin glue can be cured at neutral and room temperature, cold-pressed, its boiling water resistance and weather resistance, the bonding process is simple, and it is used for bonding thick wood or board such as bridges, sleepers and outdoor components . After the amino resin and phenolic resin are cured, the adhesive layer shrinks and becomes brittle. Adding extenders or fillers makes the adhesive layer have a certain plasticity, which can improve its aging resistance.

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