| 摘要 |
PROBLEM TO BE SOLVED: To obtain a resin foam having a fine cell structure and excellent thermal conductivity, compressive strength, mechanical strengths, and heat insulation properties by using an oligomer of trifluorochloroethylene in a specified ratio. SOLUTION: A modifier such as urea, an amine, an amide, an epoxy compound, a monosaccharide, a starch, a poval resin, a polyvinyl alcohol resin, or a lactone is added to a resol resin to obtain a resol resin composition having a viscosity of 1,000-50,000 cP. The composition is mixed with 0.1-10 wt.% oligomer of trifluorochloroethylene, a blowing agent selected from low-boiling hydrocarbons and hydrofluorocarbons, a surfactant, and a curing catalyst, and the mixture is foamed. The oligomer is one represented by the formula (wherein (n)is 4-13), having an average molecular weight of about 500 to 1,500, and being oily to waxy at ordinary temperature dependent on the average molecular weight. |
