Synthetic conditions of foaming phenolic resin and factors erecting 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.
The parameters that affected indexes of foamable resin including reaction time, reaction temperature, the mole ratio of phenol and formaldehyde were studied. The influence on the preparation technology of phenilic resin has been investigated through studying the contents of free formaldehyde in phenolic resin.
The effects of viscosity 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 100 to 150s.
When viscosity of resin was 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 should be controlled at 10--15%,in order to get good quality of phenolic foam. The more blowing agent content; the change of apparent density of foam was smaller. With the raised of carbamide, the contents of free formaldehyde in phenolic resin decreases constantly.