METHOD FOR PRODUCING BINDER BASED ON DICYCLOPENTADIENE FOR SERIAL PRODUCTION OF IMPACT-RESISTANT POLYMER PRODUCTS USING RIM AND RTM MOULDING TECHNOLOGY Russian patent published in 2023 - IPC C08G61/08 C08J3/24 C07C7/148 C08L45/00 C08K5/13 C08K5/529 B29C45/00 

FIELD: chemistry of high-molecular compounds.

SUBSTANCE: invention relates to a method for producing a binder based on dicyclopentadiene (DCPD), used in the process of serial production of impact-resistant polymer products using RIM (reaction injection moulding) and RTM moulding technology using thermally activated ruthenium catalysts for the metathesis polymerization of dicyclopentadiene. To obtain a binder based on dicyclopentadiene for the serial production of polymer products using RIM and RTM serial moulding technology, at stage a) the removal of catalytic poisons from commercial dicyclopentadiene (DCPD) with a purity of at least 98% is carried out by heating in an inert gas atmosphere to a temperature of 35-110°C, adding 2,6-di-tert-butyl-4-(dimethylamino)phenol in an amount of 0.1-0.5 wt.%, holding for 5-30 minutes with stirring. Then tris(2,4-di-tert-butylphenyl)phosphite is added in an amount of 0.25-0.5 wt.%, stirred for 10-60 minutes at a temperature of 80-110°C, the mixture is heated to a temperature of 155-170°C, incubated for 30-120 minutes, cooled to room temperature and filtered through a layer of active aluminium oxide. The antioxidants tetrakis[methylene(3,5-di-tert-butyl-4-hydroxyhydrocinnamate)]methane and tris(2,4-di-tert-butylphenyl)phosphite are dissolved in the resulting purified filtrate in a total amount of 0.1-1 wt.% relative to the taken filtrate and a polymer impact modifier based on ethylene-propylene copolymer, ethylene-propylene-diene copolymer or styrene-ethylene-butylene-styrene block copolymer is added in an amount of 2-5 wt.% relative to the taken filtrate. The resulting reaction mixture is heated in a nitrogen atmosphere with stirring to a temperature of 100-170°C and incubated for 1-5 hours until the polymer impact modifier dissolves, cool the mixture to a temperature of 25-50°C and kept for 6-24 hours.

EFFECT: increased stability of the binder during storage and processing, reduced moulding time under standard RIM and RTM moulding conditions, and increased impact strength of polymer products.

2 cl, 1 ex