폴리 우레탄 발포체에 인계 난연제 첨가에 따른 특성 연구

Abstract

Of many types of flame retardants, the most used halogen-containing flame retardants were put under environmental restrictions in their use, so phosphorus-based flame retardants have come into the spotlight instead. Flame retardants commonly bring about degradation in thermal and mechanical properties of resins when added to resins. Studies of new flame retardants were conducted in an attempt to minimize degradation of physical properties and require enough flame retardancy. In the studies, three types of non-halogen phosphorus-based flame retardants were synthesized with diaryl alkyl phosphate esters, aromatic phosphate esters and phosphonium nitron flame retardants, which was then identified by Gas chromatography(GC) and IR. An inspection was made of the impact on thermal and mechanical properties, with urethane foam added. Thermal gravimetric analysis(TGA) was used to identify thermal properties, and measures of Limit Oxygen Index(LOI) and combustibility were carried out to check flame retardancy. Mechanical properties completed the identification process through foaming magnitude, rebound resilience, specific gravity, hardness, tearing strength, tensile strength, elongation, and compression set (CS). As for the basic responsibility in foaming, it was identified by Rising time(RT), Cream time(CT), and Tack free time(TFT). Regarding thermal properties of polyurethane foam, LOI values showed an increase as the capacity of flame retardants rose, showing a reduction in after-flame time by the flammability test. As a result, an addition of phosphorus-based flame retardants revealed an increase in flame retardancy along with a rise in capacity. However, an increase in flame retardant capacity indicated a rise in RT, CT and TFT, which brought about the consequence of delaying the discharge of urethane foam. Mechanical properties presented a slight difference according to flame retardants, but showed similar characteristics to the properties of the existing halogen-containing flame retardants.