Polyurethane 2-pack paints, when mixed, cure by the reaction of a polyalcohol in Part A with an isocyanate resin
to form a urethane polymer (equation 1):
Two of those beams were laminated using phenol-resorcinol-formaldehyde (PRF) resin (5210J resin with 6310L hardener produced by Momentive Glue Company), while an additional two beams were laminated using a formaldehyde-free isocyanate resin
(GT20 with a GT205 hardener produced by Purbond).
For all cases, the amount of catalyst and polyol added was based on the volume of isocyanate resin
Effect of polyol on thermo-oxidative degradation of isocyanate resin
for wood adhesives.
patent for the process technology of making a straw-based engineered board with isocyanate resin
. A Canadian patent was awarded in 1998.
As described above, a series of wood-metal foil samples was prepared by gluing the two substrates (metal and wood, extracted or nonextracted) with isocyanate resins
. The assemblies were then failed by application of a 180[degrees] peeling force.
Effective binders are phenol formaldehyde, urea formaldehyde, or isocyanate resins
. The formaldehyde binders are effective but toxic, leading to environmental problems.
According to a report prepared by CARB, urea formaldehyde resins cost about half as much as phenol formaldehyde resins and about one-fourth the cost of isocyanate resins
. Julia noted that less costly alternatives to urea formaldehyde, including soy-based adhesives, though beginning to be used commercially in hardwood plywood production, have not as yet been used for manufacturing particleboard and MDF.
By definition, the isocyanate resins
contain nitrogen, and functionality is to some extent a measure of the isocyanate content.
However, he said some of the challenges these manufacturers must overcome include ironing out manufacturing bugs and costs associated with raw material procurement and the use of more expensive isocyanate resins
The second place winner, Sudipto Das, received a $500 check and an engraved plaque for his paper "Probing the Interactions Between Isocyanate Resins
and Wood Polymers." Sudipto was born in Calcutta, India.
Both P-F resins and isocyanate resins
would add substantially to the cost of the product.