The Preparation Of High Resilience & Slow Resilience Polyurethane Foams And Its Antibacterial Modification Research

In this paper, high resilience and slow resilience polyurethane foams were prepared with modified MDI instead of TDI by one-step process, and the slow resilience polyurethane foams were modified with antibacterial agent. The effects of polyether polyols, blowing agent, catalyst, foam stabilizer, opening agent, antibacterial agent and isocyanate index on the density, resiliency, tensile strength, elongation at break, microstructure, thermal properties, reaction time and other properties were studied.For the high resilience polyurethane foams, when the foaming agent water was 3phr, amine catalysts 0.15phr, organotin catalyst 0.15phr, foam stabilizer Y103660.6phr, isocyanate index for 90%,the foam product had good structure,high strength, high resiliency, high thermal stability, with density of 63 kg/m3, resiliency of 55.4%, tensile strength of 160 kPa, elongation at break of 102.4%,10% decomposition temperature of 320.9?.For the slow resilience polyurethane foams, when the ratio of polyether polyols ZS2801and Y1030 was 70:30, blowing agent water 2phr, amine catalysts 0.1phr, organotin catalyst 0.1 phr, foam stabilizer B8002 0.6phr, opening agent 2 phr, isocyanate index for 75%,the foam product had good structure,high strength, low resiliency, high thermal stability, with density of 68.5 kg/m3, resiliency of 8.4%, tensile strength of 110 kPa, elongation at break of 104.4%,10%decomposition temperature of 308.6?.Three kinds of nanometer silver antibacterial agents (AEM5700-A, RHA-T2, the RHA-M-4)were used to antibacterial modification of slow resilience polyurethane foams.The results showed that slow resilience polyurethane foams with 0.6phr AEM5700-A had good physical properties and excellent antibacterial effect, with density of 66.1 kg/m3, resiliency of 10.4%, tensile strength of 106.8 kPa, elongation at break of 81.2%,10% decomposition temperature of 325.4?, significant antibacterial effect to staphylococcus aureus and escherichia coli, compared with the unmodified slow resilience polyurethane foam, in addition to a lower elongation at break, other mechanical properties changed little, but the density was reduced and heat resistance was improved.