| Polyurethane（PU）elastomer is widely applied to many fields such as national defense,metallurgy,mining and people’s everyday life owing to the characteristics of high tensile strength,high elasticity,abrasion resistance,oil resistance,and tear resistance.However,chips and small particles are intended to adhere to the surface of PU during relative sliding process,generating large internal heat and affecting its comprehensive performance,moreover the non degradability of the common polyurethane materials seriously affect the ecological environmental.In this paper,aiming at the above-mentioned two defects,eco-friendly waterborne polyurethane coatings are applied to polyurethane elastomer.Furthermore,the polyurethane elastomer were modified with filling organic powder（PTFE,PEW and MCA）,inorganic oxide nanoparticles（SiO2,TiO2and Al2O3）and wood fibers respectively.Their composite performances were analyzed through electromechanical universal testing machine,surface resistance analyzer,scanning electron microscopy,thermal analyzer and differential scanning calorimeter.Summing up the results,it can be concluded as follows:（1）The organic powder polyurethane elastomer composites were produced,filled with PTFE,PEW and MCA through mechanical mixing.Meanwhile the tensile strength of materials filled with 0.4 wt.%MCA increased to 19.2 MPa from 17.2MPa of the unfilled PU,and the elongation at break of the mentioned above materials increased to 662%from 329%,the glass transition temperature increased to-26.7℃from-28.5℃.（2）The surface modification of SiO2,TiO2and Al2O3inorganic oxide nanoparticles were carried out using KH550 silane coupling agent,and the inorganic oxide nanoparticles polyurethane elastomer composites were prepared with mechanical mixing.The analysis results showed that:The surface modification of SiO2,TiO2and Al2O3nanoparticles were carried out with 1 wt.%KH550 of the mass of modified particles.When the modified Al2O3composites were filled with 8 wt.%,the tensile strength increased from 17.2 MPa to 20.9MPa compared with the unfilled PU.The elongation at break increased from329%to 1759%,increased by 21.5%and more than 4 times,respectively,the glass transition temperature is-28.44℃.（3）Water-based epoxy resin and E-51 epoxy resin were used to modify wood fiber respectively,and subsequently wood fiber polyurethane elastomer composites were prepared with mechanical mixing process.The interface compatibility between the wood fiber and the matrix was improved when treated with E-51 epoxy resin and dicyandiamide solution with a mass ratio of 100:11,and the wood fibers were modified with 2 wt.%E-51 epoxy resin,and the tensile strength of materials filled with 2 wt.%modified wood fiber exhibited an increased value of 23.7 MPa as compared with17.2 MPa of the unfilled PU,and the elongation at break of the mentioned above materials increased to 2269%from 329%,the glass transition temperature increased to-27.4℃from-28.5℃.（4）The waterborne polyurethane were modified with multifunctional anti-friction agent,PTFE and PEW powder,respectively.The surface resistance can be reduced to 7×109Ωwhen filled with multifunctional anti-friction agent with the content of 0.5 wt.%.And the surface contact angle of the coating reached as high as 93.3°when filled with 40 wt.%PTFE powder. |
