What is the reaction between phenol and formaldehyde?
One reacts phenol and formaldehyde directly to produce a thermosetting network polymer, while the other restricts the formaldehyde to produce a prepolymer known as novolac which can be moulded and then cured with the addition of more formaldehyde and heat.
How will you convert formaldehyde into phenol?
Phenol/formaldehyde resins used to manufacture high-pressure laminates are typically produced by reacting phenol and formaldehyde by means of an alkaline catalyst such as sodium hydroxide [10]. Typical mole ratios of formaldehyde to phenol range from 1.2 to 1.9 mol of formaldehyde per mol of phenol.
What is the commercial name of phenol formaldehyde?
Bakelite
Phenolic resins are also widely known as phenol–formaldehyde resins, PF resins and phenoplasts. The trade name Bakelite has in the past been widely and erroneously used as a common noun and indeed is noted as such in many English dictionaries.
Is phenol formaldehyde a monomer?
Bakelite is a polymer made up of the monomers phenol and formaldehyde. This phenol-formaldehyde resin is a thermosetting polymer.
What is PF glue?
What is Phenol Formaldehyde Used For? Phenol Formaldehyde resins make superior wood adhesives and are widely used glues for construction grade wood panels such as plywood and oriented strand boards which need to be waterproof. Resoles are the resins used primarily for plywood and wood glues.
What is the condensation product of phenol and formaldehyde?
One of them involves the reaction of phenol and formaldehyde directly to produce a network polymer known as thermosetting polymer, while the other method restricts the formaldehyde to produce the polymer in our question known as Novolac. 2.
Why is phenol formaldehyde good?
Phenolic resins have excellent resistance to heat and chemicals, making them ideal for volatile environments. In addition, phenol formaldehyde resin properties include good thermal insulation, low density and excellent durability.
Why is formaldehyde used?
Formaldehyde is a strong-smelling, colorless gas used in making building materials and many household products. It is used in pressed-wood products, such as particleboard, plywood, and fiberboard; glues and adhesives; permanent-press fabrics; paper product coatings; and certain insulation materials.
How is phenol formaldehyde made?
phenol-formaldehyde resin, also called phenolic resin, any of a number of synthetic resins made by reacting phenol (an aromatic alcohol derived from benzene) with formaldehyde (a reactive gas derived from methane). The other method involves reacting formaldehyde with an excess of phenol, using an acid catalyst.
What is WBP glue?
WBP stands for “Water Boiled Proof” . If you use WBP glue for the plywood / film faced plywood, the panel will can be exposed to weather, water and moisture for a long period (some maybe permanently ) without delamination . If a glue has WBP property, the glue will can be called WBP glue .
Who makes resorcinol glue?
DGR Industrial Products, Inc. :: Structural Adhesives :: Resorcinol Adhesives :: Weldwood Resorcinol Structural Adhesive. and is still made by Hexion as was the private label Weldwood brand. withstands continuous salt or fresh water immersion, outdoor exposure, and tropical or sub-zero temperatures.