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Title:: Modification of nitrile rubber 2980 with liquid nitrile rubber YN 25

Author(s):: ZHANG Shou-han; GUO Zhi-rong; CUI Guo-feng; WANG Feng-le; Lanzhou Petrochemical Company, PetroChina, Lanzhou 730060, China

Keywords:: nitrile rubber; liquid nitrile rubber; mechanical blending; modification; Mooney viscosity; vulcanization characteristics; tensile property

摘要:: 将液体丁腈橡胶（牌号YN 25）与丁腈橡胶（NBR）2980进行机械共混制备了NBR 2980 M，研究了YN 25加入量对NBR 2980 M混炼胶的门尼黏度、硬度和硫化特性及硫化胶拉伸性能的影响。结果表明，随YN 25加入量增加，NBR 2980 M的门尼黏度、50 min的300%定伸应力、拉伸强度、最大和最小转矩均呈线性下降，扯断伸长率及25 min、50 min和90 min三个转矩差硫化时间均线性上升，而混炼胶硬度的变化不明显。YN 25在NBR 2980 M中的质量分数每增加1%，混炼胶门尼黏度下降0.78，50 min的300%定伸应力、拉伸强度、最大和最小转矩分别下降0.15 MPa、0.17 MPa、0.12 dN·m和0.02 dN·m，扯断伸长率及25 min、50 min和90 min三个硫化时间分别增加4.1%、0.05 min、0.08 min和0.18 min。

Abstract:: Nitrile rubber （NBR） 2980 M was prepared by mechanical blending of liquid nitrile rubber （YN 25） into NBR 2980. The effect of YN 25 addition ratio on the Mooney viscosity, hardness, vulcanization characteristics of NBR 2980 M compound, and tensile properties of NBR 2980 M vulcanizate were studied. The results showed that with the increase of YN 25, Mooney viscosity, modulus at 300% at 50 min, tensile strength, maximum and minimum torque of NBR 2980 M all decreased li-nearly, while the elongation at break and three torque differences vulcanization times of 25 min, 50 min, and 90 min all increased linearly. However, the change in hardness of the compound was not significant. For increase in mass fraction of YN 25 in NBR 2980 M by 1%, Mooney viscosity of the compound decreases by 0.78, and the modulus at 300%, tensile strength, maximum and minimum torque of the vulcanizate decrease by 0.25 MPa, 0.17 MPa, 0.12 dN·m, and 0.02 dN·m, respectively. The elongation at break and three vulcanization times of 25 min, 50 min, and 90 min increase by 4.1%, 0.05 min, 0.08 min, and 0.18 min, respectively.