Construction Sealants Based on EPDM Modified with Silane-Terminated Urethane Prepolymers

Abstract

Abstract In connection with the use of new materials and structures in construction, the issue of developing sealing materials for construction purposes with an improved set of properties remains relevant. In particular, sealing materials based on ethylene propylene diene rubber (EPDM) are promising due to their resistance to UV radiation, ozone, and the absence of cold flow. The paper shows the possibility of obtaining reactive sealants based on EPDM and silane-terminated prepolymers - STP based on oligotetraoxymethylene glycol (polyfurite) and based on oligooxypropylene glycol (laprol). The use of prepolymers leads to an increase in the cohesive and adhesive strength of the sealing compositions, while maintaining the cohesive nature of the fracture. Also, the obtained sealants are more technological, since they have a lower viscosity under processing conditions. Extensive tests of reactive sealants based on EPDM have shown that after aging it has a higher level of properties compared to sealants without STP.