In order to study the squeeze-strengthening effect of silicone oil-based magnetorheological fluid （MRF）, theoretical basis of disc squeezing brake was presented and a squeezing braking characteristics test-bed for M...In order to study the squeeze-strengthening effect of silicone oil-based magnetorheological fluid （MRF）, theoretical basis of disc squeezing brake was presented and a squeezing braking characteristics test-bed for MRF was designed. Moreover, relevant experiments were carded out and the relationship between squeezing pressure and braking torque was proposed. Experiments results showed that the yield stress of MRF improved linearly with the increasing of external squeezing pressure and the braking torque increased three times when external squeezing pressure achieved 2 MPa.展开更多
In this work,we used the in ert substances silic one oil a nd n-hexane to modulate the solve nt environ ment,and in so doing tailor the preparation of magnesium ethoxide(Mg(0Et)2)particles.We found the following:(1)no...In this work,we used the in ert substances silic one oil a nd n-hexane to modulate the solve nt environ ment,and in so doing tailor the preparation of magnesium ethoxide(Mg(0Et)2)particles.We found the following:(1)non polar n-hexane mainly modulates the polarity of the solvent to control the precipitation rate and size of the Mg(OEt)2 seeds,thereby triggering accelerated nucleation to form small primary particles;and(2)silicone oil(relatively high polarity and viscosity)facilitates the growth and agglomeration stage,to improve inter-particle dispersion and obtain relatively uniform Mg(OEt)2 particles.We summarized these findings in a comm on mechanism for preparing Mg(OEt)2 particles with uniform morphology,small size,and high bulk density as per the synergistic effect of n-hexane and silicone oil.The ratios of silicone oil end n-hexane are flexible,and afford various regular and well-dispersed Mg(OEt)2 particles that are 5-30μm in size and 0.2-0.7 g/cm^3 in bulk density.The nanoparticles thus have the potential to serve in diverse applications such as catalysis.展开更多
A series of waterborne polyurethane emulsions modified by copolymerization with WACKER IM 22、RHODORSIL OIL 1647 V60、KF-6001 and traditional hydroxy-terminated silicon oil respectively for leather finishing were synt...A series of waterborne polyurethane emulsions modified by copolymerization with WACKER IM 22、RHODORSIL OIL 1647 V60、KF-6001 and traditional hydroxy-terminated silicon oil respectively for leather finishing were synthesized, and characterized with GPC, DSC, TEM and TGA and their finishing properties on leathers were measured.The results showed that, the number average relative molecular weight decreased, while the thermal decomposability was similar to the unmodified waterborne polyurethane.The compatibility of soft and hard segments of waterborne polyurethane modified by WACKER IM 22 was good.The freezing resistance and leveling effect were good when the mass ratio of the WACKER IM 22 to polypropylene glycol was 20%.The binding power was good when the leathers were finished by waterborne polyurethane modified by hydroxyl based silicon oil.The hand feeling of said leather style was nice and soft and the water resistance property was increased.展开更多
基金Funded by National Natural Science Foundation of China(No.51475454)National Natural Science Foundation of JiangsuProvince(No.BK20151144)+1 种基金Fundamental Research Funds forthe Central Universities(No.2014QNA38)Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)
文摘In order to study the squeeze-strengthening effect of silicone oil-based magnetorheological fluid （MRF）, theoretical basis of disc squeezing brake was presented and a squeezing braking characteristics test-bed for MRF was designed. Moreover, relevant experiments were carded out and the relationship between squeezing pressure and braking torque was proposed. Experiments results showed that the yield stress of MRF improved linearly with the increasing of external squeezing pressure and the braking torque increased three times when external squeezing pressure achieved 2 MPa.
基金the National Natural Science Foundation of China(grant numbers 21422603,U1662120,and 21978152).
文摘In this work,we used the in ert substances silic one oil a nd n-hexane to modulate the solve nt environ ment,and in so doing tailor the preparation of magnesium ethoxide(Mg(0Et)2)particles.We found the following:(1)non polar n-hexane mainly modulates the polarity of the solvent to control the precipitation rate and size of the Mg(OEt)2 seeds,thereby triggering accelerated nucleation to form small primary particles;and(2)silicone oil(relatively high polarity and viscosity)facilitates the growth and agglomeration stage,to improve inter-particle dispersion and obtain relatively uniform Mg(OEt)2 particles.We summarized these findings in a comm on mechanism for preparing Mg(OEt)2 particles with uniform morphology,small size,and high bulk density as per the synergistic effect of n-hexane and silicone oil.The ratios of silicone oil end n-hexane are flexible,and afford various regular and well-dispersed Mg(OEt)2 particles that are 5-30μm in size and 0.2-0.7 g/cm^3 in bulk density.The nanoparticles thus have the potential to serve in diverse applications such as catalysis.
文摘A series of waterborne polyurethane emulsions modified by copolymerization with WACKER IM 22、RHODORSIL OIL 1647 V60、KF-6001 and traditional hydroxy-terminated silicon oil respectively for leather finishing were synthesized, and characterized with GPC, DSC, TEM and TGA and their finishing properties on leathers were measured.The results showed that, the number average relative molecular weight decreased, while the thermal decomposability was similar to the unmodified waterborne polyurethane.The compatibility of soft and hard segments of waterborne polyurethane modified by WACKER IM 22 was good.The freezing resistance and leveling effect were good when the mass ratio of the WACKER IM 22 to polypropylene glycol was 20%.The binding power was good when the leathers were finished by waterborne polyurethane modified by hydroxyl based silicon oil.The hand feeling of said leather style was nice and soft and the water resistance property was increased.
