双转子连续挤出机掺混工艺对ABS树脂性能的影响

运用自主研发的双转子连续挤出机探究了掺混工艺对苯乙烯-丙烯腈-丁二烯（ABS）树脂力学性能的影响；借助Polyflow模拟软件分析了掺混工艺对设备混合能力的影响；通过对ABS树脂流变和微观结构的表征，探讨了掺混工艺对橡胶粒子微观形貌的影响。结果表明，随着螺杆转速的增加，设备分散和分布混合能力提高，橡胶粒子的团聚现象减弱，分布均匀性提高，当螺杆转速为400 r/min时，ABS树脂的拉伸强度、弯曲强度、弯曲模量和冲击强度分别提高了16.8 %、15.4 %、30.7 %和7.7 %；当螺杆转速为500 r/min时，在剧烈的剪切作用下，橡胶粒子发生内接枝，导致ABS树脂的力学性能与螺杆转速为400 r/min时的力学性能相比，分别下降了7.6 %、7.5 %、21.8 %和32.6 %。

Effect of Blending Condition on Performance of ABS Resin Through Twin-rotor Continuous Extruder

An acrylonitrile-butadiene-styrene (ABS) resin was prepared through a self-developed twin-rotor continuous extruder. The effect of blending condition on mechanical properties of ABS resin was investigated, and the mixing ability of extruders was evaluated by POLYFLOW software. The rheological behavior and microstructure of ABS resin were characterized to investigate the effect of blending condition on the micro-morphology of rubber particles. The results indicated that the dispersive and distributive mixing abilities of the extruder were improved with an increase of rotor speed. As a result, the aggregation of rubber particles was reduced and their dispersibility was enhanced. When the rotor speed was set to 400 r/min, the tensile strength, flexural strength, flexural modulus and impact strength of ABS resin were improved by 16.8 %, 15.4 %, 30.7 % and 7.7 %, respectively. However, at the rotor speed of 500 r/min, the tensile strength, flexural strength, flexural modulus and impact strength decreased by 7.6 %, 7.5 %, 21.8 % and 32.6 %, respectively, compared with the sample obtained at the rotor speed of 400 r/min. This may be due to the internal grafting of rubber particles caused by an intensive shear effect.