Discrete Event Simulations by Aitor Goti (Ed.)

By Aitor Goti (Ed.)

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Differences Between Resole and Novoiac Phenolic Resins The differences between resole and novolac phenolic resins are: Resole phenolic resins are produced by using alkaline catalysts, (1) whereas novolac resins are produced via acidic catalysts. Resole phenolic resins are produced via B-staging while novolac (2) resins are made by prepolymerization. Resole phenolic resins are methylol-bearing resins while novolacs are (3) non-methylol-bearing resins. Resoles typically have a shelf life of less than 1 year (less than 60 (4) days), whereas novolacs have an infinite shelf life.

The boards produced are postcured by hot stacking them in storage. The strength of the boards produced depends on the type and structure of the wood chips used and the resin formulation. Particle boards with higher resin contents have higher bonding strength. Particle board is predominantly a ureaformaldehyde-based product, with phenolic resins-based particle board products accounting for only about 10% of the particle board market. Particle board is used in the construction of furniture core, floor underlayers, prefabricated housing, freight cars, and ships.

Novolac phenolic resins have an infinite shelf life under normal storage conditions. OH Phenol Novolac Phenolic Resin (Non-MethylolBearing) Resinification Reaction of Novolac-type Phenol-Formaldehyde resin A schematic of a reactor vessel used for the typical bulk polymerization process in the resinification of phenol-formaldehyde resins as shown in Figure 2-l. The sleanljacket provides the temperature condition needed for the poly- condensation reaction of phenol and formalin. The condcnscr facilitates the condensation and removal of water vapor resulting from the phenol/formalin rcaclion.

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