Natural rubber (NR) blends were filled with soya protein isolate (SPI) in various amounts: 0; 10; 20; 30; 40 phr. To improve interfacial adhesion, calcium sulfate dihydrate (CSD) in amounts of 0 and 2.5 phr was added. Hardness, tensile strength, and elongation at break before and after thermooxidation aging (TOA), morphology of blends and thermal stability were studied for prepared blends. Amount of filler in the blends mainly affected hardness which increased with the increasing filler amount (stiffening effect of the filler in the blend). Amount of filler also affected tensile strength and elongation at break which were lowered with increasing filler amount. Crosslinking agent CSD had significant effect on interfacial adhesion between filler and rubber.

天然橡胶 (NR) 共混物中填充了不同数量的大豆分离蛋白 (SPI)：0；10个；20; 30; 40 份 为了改善界面粘附，添加了 0 和 2.5 份的硫酸钙二水合物 (CSD)。研究了制备的共混物在热氧化老化 (TOA) 前后的硬度、拉伸强度和断裂伸长率、共混物的形貌和热稳定性。共混物中的填料量主要影响硬度，硬度随填料量的增加而增加（共混物中填料的硬化作用）。填料量也影响拉伸强度和断裂伸长率，随着填料量的增加而降低。交联剂CSD对填料与橡胶的界面粘合力有显着影响。