聚氨酯中PTMG/PNA比例对塑胶跑道材料性能的影响

Effect of PTMG/PNA Ratio in the PU on the Performance of Synthetic Plastic Track Material

以聚醚三醇330N、聚醚二醇220A、聚四氢呋喃二醇PTMG2000和聚酯二醇PNA2000与4,4′-二环己基甲烷二异氰酸酯(HMDI)和异佛尔酮二异氰酸酯(IPDI)为原料反应合成聚氨酯预聚体,再加入HDI(1,6-六亚甲基二异氰酸酯)三聚体、增塑剂ATBC和催化剂T-12制备单组分聚氨酯胶,然后与橡胶颗粒混合制备塑胶跑道材料。考察了PTMG2000与PNA2000质量比对塑胶跑道试片的力学性能、冲击吸收、垂直变形及耐老化性能的影响。结果表明,当PTMG2000与PNA2000的质量比为30/20时,塑胶跑道试片的拉伸强度和冲击吸收最高,断裂伸长率最低,热氧老化后的拉伸强度和冲击吸收降低值最小;当PTMG2000与PNA2000质量比为20/30时,垂直变形最小。

Polyurethane prepolymers were synthesized by reaction of polyethertriol 330N,polyether diol 220A,PTMG2000 and polyester diol PNA2000 with 4,4′-methylenebis(cyclohexyl isocyanate)(HMDI)and isophorone diisocyanate(IPDI)as raw material.One-component polyurethane binders were prepared by adding HDI trimer,plasticizer ATBC and catalyst T-12 to the prepolymers,then the plastic track materials were prepared mixing the binder with EPDM rubber particles.The influence of PTMG2000/PNA2000 mass ratio on the mechanical properties,impact absorption,vertical deformation and aging resistance of synthetic plastic track samples was investigated.The results showed that,when the mass ratio of PTMG2000/PNA2000 was 30/20,the tensile strength and impact absorption of the synthetic plastic track material were the highest,the elongation at break was the lowest,and the reduction of tensile strength and impact absorption after thermal oxygen aging was the smallest.When the mass ratio of PTMG2000/PNA2000 was 20/30,the vertical deformation was the lowest.