The Effect Of Inorganic Particle Surface Modification On The Energy Consumption Of Polyurethane Elastomer

The excellent mechanical properties of polyurethane elastomers make it very suitable for making tires,especially load-bearing tires.At present,most of the polyurethane solid tire products used in China are TDI(Toluene-2,4-diisocyanate)polyurethane,which has the characteristics of low price,simple synthesis steps,and low equipment requirements.However,the TDI type polyurethane solid tire has a low upper speed limit and a short service life.The fundamental problem lies in the high dynamic internal heat generation of the polyurethane solid tire manufactured by TDI type polyurethane elastomer,while the thermal conductivity of the polyurethane itself is poor.Therefore,under long-term use,a large amount of heat accumulation in the polyurethane solid tire leads to a continuous increase in tire temperature,a decrease in strength,a decrease in load capacity,and ultimately tire damage.To optimize the performance of TDI polyurethane solid core tires,TDI polyurethane was composite with inorganic particles,effectively improving the tensile strength,increasing wear resistance,reducing internal heat generation,and extending service life of TDI polyurethane.The main research content of this paper is as follows:Ⅰ:Using chemical surface engineering methods,graft silane coupling agents onto the surface of particles.Activation of alumina using sodium hydroxide solution,successfully converting KH550(y-Aminopropyltriethoxysilane)is grafted onto the surface of particles to improve their surface activity,resulting in a significant improvement in the dispersion and compatibility of alumina in polyurethane prepolymers.Ⅱ:Composite the modified inorganic particles with TDI polyurethane,and study the effect of the addition of modified inorganic particles on the properties of polyurethane elastomers.The micrometer sized alumina particles modified by TDI polyurethane composite have good tensile strength and thermal stability.The endogenous heat of TDI polyurethane is significantly reduced,and the thermal conductivity is significantly improved.The service life of polyurethane solid core tires has been improved by 86%;To study the influence of inorganic particle types on the performance of TDI polyurethane,alumina and silica particles with the same particle size were selected,and the modification methods were the same.The results showed that the effects of the two particles on the tensile strength and endogenous heat of TDI polyurethane were roughly the same.Ⅲ:Study the effect of modified alumina particles with different particle sizes on the mechanical properties and service life of TDI polyurethane.The results indicate that compared to micrometer sized alumina particles,nano alumina particles have better compatibility and dispersibility in TDI polyurethane,which can improve the tensile strength of polyurethane composites,significantly reduce internal heat generation,and increase walking time by 178%.However,after modification,the service life of micrometer sized aluminum oxide is only increased by 86%.This study provides a simple and feasible synthesis method for surface modification of inorganic particles.By preparing TDI polyurethane/inorganic particle composite materials,the dynamic internal heat generation of TDI polyurethane materials is reduced,and the fatigue resistance during high-frequency use is improved,significantly increasing the upper speed limit and service life of TDI polyurethane solid core tires.