The Study On Synthesis Of Foaming Phenolic Resin And Properties Of Phenolic Foam

Synthetic conditions of foaming phenolic resin and factors effecting on properties of phenolic foam were studied in this work. Optimum conditions that were the key problems to be resolved were found by researching phenolic resin used in foam, on the basis of which, factors of phenolic foam were investigated, the ways of getting good properties of foam were found. The fire retardancies of PF and PU were compared.The parameters that affected indexes of foamable resin including reaction time, reaction temperature, CaO catalyst content as well as the mole ratio of phenol and formaldehyde were studied. The lab conditions of foamable resin by orthogonal and single factor experiments were found. The results showed that reaction temperature was the key parameter of affecting viscosity and solid content of resin and polymerization rate. Formaldehyde content and water thinned degree changed obviously within one hour of reaction.The effects of viscosity and solid content of resin on properties of foam were investigated, indexes of resin of operation available and getting good properties of foam were given: viscosity and solid content of resin should be controlled at 2000~ 4000 cP and 78~81%.When viscosity and solid content of resin were determined, the effects of foaming temperature, blowing agent and acid catalyst on properties of foam were discussed, such conclusions were draw: higher foaming temperature was beneficial to getting good foam, but too higher foaming temperature led to perforation. The more acid catalyst content, rise time and tack free time of foam were shorter, but it...