Application Of The Artificial-stone Waste In EPDM Rubber And The Study Of The Ceramics Performance Of The Compounds

Rubber-based ceramifying composites are one new kind of fire-resistant materials developed in recent years,which show the similar processing and mechanical properties with common rubbers at room temperature,while they will be turned to be self-supporting ceramics with a certain strength under high temperature or fire environment,preventing the flame from spreading into the composites.The composites have broad applications in the fields of wires and cables,flame-resistance building materials,aviation and aerospace and so on.Artificial stone shows many advantages,such as varied patterns,minor color difference and convenient processing.However,during the preparation and processing of artificial stone,a large amount of polished waste were accompanied.The polished waste is difficult to be recycled,generally only for accumulation or landfill treatment,causing serious environmental pollution.In this study,we prepared a ceramizable waste/ethylene propylene diene rubber(EPDM)blend,with the addition of polished waste as ceramic fillers,and organic acids as modifiers,and zinc borate or glass powders as flux agents.The effects of organic acids,zinc borate and ammonium polyphosphate(APP)on the properties of the blends and the ceramic obtained after high temperature ablation were also investigated.Firstly,the modification effect of sorbic acid,oleic acid,crotonic acid and cinnamic acid on waste/EPDM blends were compared.The results showed that the most obvious influence on the mechanical properties of the waste/EPDM blends by incorporation of sorbic acid was revealed.When the amount of sorbic acid increases from 0 phr to 15 phr,the tensile strength of the waste/EPDM blends increases from 2.6 to 8.7 MPa,the elongation at break increases from 196% to 763%,and the tear strength increases from 8 to 29kN/m.Secondly,with the mass ratio of the waste and sorbic acid is 100:15,when the amount of waste increases from 0 phr to 200 phr,the tensile strength of the vulcanizate increases from 1.3 to 9.3 MPa,and the tear strength initially increases and then decreases.When the content of the waste is 133 phr,the tear strength can reach up to 31.1 kN/m.Thirdly,when the content of zinc borate increases from 0 to 66.7 phr,the tensile strength of the waste/EPDM blends increases from 2.9 to 5.8 MPa,and the elongation at break decreases from 221% to 122%.After ablation at 1000℃,the mass loss rate of the ceramics decrease,and the impact strength of the ceramic increases from 1.17 to 2.04J/m.The three-point bending strength of the ceramic is 9.22 MPa with the addition of 33 phr zinc borate.The surface smoothness of the ceramic gradually increases and the number of the pores decreases with the addition of zinc borate up to 50 phr.Lastly,when the dosage of APP increases from 0 to 80 phr,the tensile strength and the elongation at break of the waste/EPDM blends decrease.The mass loss rate of the ceramic gradually decreases and the linear shrinkage increases after ablation at 1000℃.The impact strength of the ceramic increases from 1.75 to 1.93J/m,and the three-point bending strength increases from 3.21 to 11.0 MPa by the incorporation of APP increasing from 0 to 80 phr.With the increase of the APP content,the dimensional stability of the ceramics is improved and the flow-collapsing phenomenon disappears and the size of the holes and cracks in the ceramics decreases,and the ceramic strength is improved consequently.