FIRE-PROOF UNSATURATED POLYESTERS ON THE BASIS OF ANHYDRIDE OF HEXABROMOBICYCLO- [2,2,1]-HEPT-5-ENE-2,3-DICARBOXYLIC ACID, GLYCERIN AND METHACRYLIC ACID
The paper deals with production of α, ω-methacryl-(bis-glycerin)- endomethylenehexabromotetrahydrophthalate (BNP) on the basis of anhydride of 1,4,5,6,7,7-hexabromobicyclo-[2,2,l]-hept-5-ene-2,3-dicarboxylic acid, glycerin and methacrylic acid. Kinetics of polycondensation is researched at 170-190C. It is ascertained that the acid number equal 30-50 mg of KOH per 1 g of unsaturated polyesters is obtained at 170 C within 6 hours, at 180C within 3.5 hours and at 190C within 3 hours. The hardening of BNP samples with the acid number from 20 up to 80 mg of KOH per lg of resin showed that gelatinization rate of the styrene solutions in the presence of 3% methylethylketone hydroperoxide and of 8% cobalt naphthenate considerably increases with the reduction of the acid number. It is ascertained that gelatinization time at 20C decreases in 6-6.5 times with the transition from BNP with the acid number of 20 mg of KOH per lg of resin to BNP with the acid number of 80 mg of KOH per lg of resin.