Combination of fluororubber and NBR Nitrile rubber is a commonly used oil-resistant rubber. Its service temperature is 120°C. It has good chemical stability and the price is much lower than fluoroelastomer. The purpose of the combined use of fluororubber and nitrile rubber is to greatly reduce the price of products, improve the processing performance of fluororubber, prepare low-hardness fluororubber products, improve the fatigue resistance of fluororubber, and improve heat resistance and chemical resistance. The aspect is in an intermediate state. According to reports, the use of DCP/TAIC as the co-vulcanization system of the combined rubber can obtain FPM/NBR combined rubber with excellent comprehensive performance and moderate price. In addition, through the study of the microscopic phase state of the combined rubber, it is found that the ultra-high acrylonitrile content (48% acrylonitrile content) and the nitrile rubber with a higher Mooney viscosity are blended with the fluorine rubber with a lower Mooney viscosity. The blend is a heterogeneous mixing system. If the fluorine rubber becomes a continuous phase, the heat resistance of the nitrile rubber can be improved by blending modification: even if the fluorine rubber does not form a continuous phase, the nitrile rubber is protected by it to improve the heat resistance. Observing the structure and morphology of the blend through electron microscopy, it can be seen that when the ratio of FPM/NBR blend is 50/50, the sea phase and island phase of the two are difficult to distinguish. Only when the volume fraction of FPM exceeds 60 parts, the fluorine rubber can form a continuous phase. In order to reduce the cost, the proportion of fluororubber should be reduced as much as possible, and the fluororubber continuous phase can be formed. Usually, the method of adding a compatibilizer in the blend can be used to solve the problem. The results show that in the blending system, the use of vinyl acrylate elastomer Vamac as a compatibilizer can improve the compatibility of nitrile rubber and fluorine rubber, and the effect is better. At the same time, in order to improve the dispersion effect of the two glues, a dispersant EAR (ethylene-methacrylate copolymer) can be added. This copolymer also improves the aging resistance of the FPM/NBR combined glue. The rate of change (decrease) of tensile properties of FPM/NBR combined rubber decreases with the increase of fluorine rubber content; when FPM/NBR contains EAR, the rate of decrease decreases significantly with the increase of fluorine rubber.

氟橡胶和NBR并用

氟橡胶与NBR并用 丁腈橡胶是常用的耐油橡胶，使用温度为120℃，化学稳定性良好，价格远低于氟橡胶。氟橡胶和丁腈橡胶并用的目的是大幅降低产品的价格，改善氟橡胶的加工性能，制得低硬度的氟橡胶产品，提高氟橡胶的耐疲劳性能，并在耐热性和耐化学介质性方面处于中间状态。 据报道指出，采用DCP/TAIC作为并用胶的共硫化体系能获得综合性能优良，价格适中的FPM/NBR并用胶。另外，通过对并用胶的微观相态研究发现，选用超高丙烯腈含量(丙烯腈含量48%)、门尼粘度较高的丁腈橡胶与门尼粘度较低的氟橡胶共混，得到的共混物是非均相混合体系。假如氟橡胶成连续相，则丁腈橡胶可通过共混改性使耐热性得到明显改善：即使氟橡胶不形成连续相，丁腈橡胶也被其保护而使耐热性得以改善。通过电镜观察共混物的结构形态可以看出，FPM/NBR共混物的配比为50/50时，二者的海相和岛相难以区分。只有当FPM的体积分数超过60份时，氟橡胶才能形成连续相。为了降低成本，应尽可能减少氟橡胶的配比，而又能形成氟橡胶连续相，通常可采用在共混物中添加增容剂的方法来解决。结果表明，在共混体系中，使用乙烯基丙烯酸酯弹性体Vamac作增容剂，可改善丁腈橡胶与氟橡胶的相容性，效果较好。同时为了改善两种胶的分散效果，可添加分散剂EAR(乙烯-甲基丙烯酸酯共聚物)，该共聚物同时也改善FPM/NBR并用胶的耐老化性质。FPM/NBR并用胶的拉伸性能变化(下降)率随氟橡胶含量的增加而降低；当FPM/NBR中含有EAR时，下降率随氟橡胶增量显著减小。