聚酯型双键封端聚氨酯预聚物的合成及其在团状模塑料中的应用

以高附着力耐温二元醇（XC-488）、甲苯二异氰酸酯（TDI）、甲基丙烯酸羟乙酯（HEMA）为原料，合成了聚酯型双键封端的聚氨酯预聚物（HPU），然后将不同含量的HPU与不饱和聚酯树脂、短切玻璃纤维、碳酸钙、阻燃剂等进行共混，用于团状模塑料（BMC）的制备。通过傅里叶变换红外光谱、差示扫描量热仪、力学性能、吸水率、熔体流动性、耐酸碱性、耐老化测试和扫描电子显微镜进行测试。结果表明，当HPU的含量为6 %（质量分数，下同）时，BMC复合材料的综合力学性能最好，此时复合材料的拉伸强度、弯曲强度、冲击强度分别为（47.24 ±0.42） MPa、（117.76±0.65）MPa、（33.8±0.2） kJ/m²。

Synthesis of Polyester?type Double Bond?terminated Polyurethane Prepolymer and Its Application in Bulk Molding Compounds

Polyester-type double bond-terminated polyurethane prepolymer （HPU） was synthesized by using a high adhesive and high heat-resistant diol （XC-488）， toluene diisocyanate （TDI） and hydroxyethyl methacrylate （HEMA） as raw materials. The bulk molding plastics （BMC） were prepared through blending HPU with unsaturated polyester resin， short cut glass fiber， calcium carbonate， flame retardant at different loadings. Fourier-transform infrared spectroscopy， differential scanning calorimeter， mechanical property test， water absorption test， melt fluidity test， acid-base resistance test， aging test and scanning electron microscope were used to characterize the structures and properties of the resultant BMC. The results indicated that the composite achieved the optimal comprehensive mechanical properties at an HPU content of 6 wt%. They also achieved tensile strength of （47.24±0.42） MPa， bending strength of （117.76±0.65） MPa and impact strength of （33.8 ± 0.2） kJ/m².