Combination of fluororubber and ethylene-propylene rubber. Both fluororubber and ethylene-propylene-diene and ethylene-propylene-diene rubber can be modified together. The purpose of using fluororubber and ethylene-propylene rubber together is mainly to improve material elasticity, low temperature resistance and reduce costs. According to reports, the blend of binary ethylene propylene rubber and tetrapropylene fluorine rubber using the dicumyl peroxide/triallyl isocyanurate (DCP/TALC) co-vulcanization system has good performance and can improve the four The low temperature performance of propylene fluorine rubber, and reduce the price. When 20% ethylene-propylene rubber is used in tetrapropylene fluorine rubber, the combined rubber obtained has better comprehensive performance; other rubbers with combined ratios also have certain development value. Because EPDM is a general-purpose rubber with excellent performance, it has high chemical stability, heat resistance, weather resistance, ozone resistance, water resistance, water vapor resistance, chemical resistance and many other excellent properties. Compared with tetrapropylene fluorine rubber, it The typical characteristics of this product are good resistance to polar media and superior low temperature performance. Tetrapropylene fluororubber is equivalent to the copolymer of ethylene molecule's fluorine substitute and propylene. Therefore, the composition and structure of the two rubbers are similar, which provides a compatibility basis for the combination of the two. By blending EPDM and FPM, it is theoretically possible to improve the low temperature resistance and elasticity of the material while ensuring the excellent corrosion resistance of FPM, improve the processing performance and reduce the material cost. Generally, the vulcanization system of FPM/EPDM also uses DCP/TAlC. When the ratio of tetrapropylene fluorine rubber/EPDM is 50:50, the brittleness temperature can be reduced to -40℃. Basic formula (parts by mass): tetrapropylene fluorine rubber 100; N-990 30, ZnSA 1.0; DCP 2.0; TAIC 5.0; MgO10; CaO 2. EPDM 100; HAF 55; HSA 1; DCP 4; TAlC1.5; ZnO 5; MB 1; DOS 10. Since EPDM and FPM are very different in polarity, it is not easy to find a curing system to make them have good vulcanization compatibility. However, when different vulcanization systems are used, the influence between each other is great, so that the static vulcanization obtained The physical properties of the mixture are poor. A more effective solution is to use a dynamic vulcanization method, which can avoid the mutual interference of the two vulcanization systems, expand the selection range of the blended rubber vulcanization system, and prepare a blend with good performance. In FPM/EPDM blends, when the blending ratio is 70/30, since FPM is a continuous phase, the blend performance is similar to FPM, and its mass change rate, tensile strength and elongation retention at break are as well as The oil resistance is close to the level of pure FPM. As the amount of EPDM increases, the heat-resistant air aging properties and heat-resistant oil properties of the blends become worse.

氟橡胶和乙丙橡胶并用

氟橡胶和乙丙橡胶并用 氟橡胶和二元乙丙和三元乙丙橡胶均能进行并用改性，氟橡胶和乙丙橡胶并用的目的主要是提高材料的弹性、耐低温性和降低成本。据报道，选用过氧化二异丙苯/三烯丙基异氰脲酸酯(DCP/TALC)共硫化体系的二元乙丙橡胶与四丙氟橡胶的共混胶性能很好，能改善四丙氟橡胶的低温性能，并降低价格。当四丙氟橡胶中并用20%的乙丙橡胶时，所获得的并用胶综合性能比较好；其他并用比的胶也有一定的开发价值。 由于EPDM是一种性能优良的通用橡胶，具有极高的化学稳定性、耐热、耐候、耐臭氧、耐水、耐水蒸汽、耐化学药品等许多优良性能，相对于四丙氟橡胶来讲，它的典型特点是耐极性介质性能较好，低温性能优越。四丙氟橡胶相当于乙烯分子的氟取代物与丙烯的共聚物，因此，两种橡胶在组成结构上的相似，为两者的并用提供了相容性基础。通过将EPDM与FPM共混，理论上能够在保证FPM优良耐腐蚀性能的同时，提高材料的耐低温性与弹性，改善加工工艺性能并降低材料成本。 一般FPM/EPDM并用的硫化体系也选用DCP/TAlC，四丙氟橡胶/EPDM的配比为50:50时，脆性温度能降低至-40℃。 基本配方(质量份)：四丙氟橡胶100；N-990 30，ZnSA 1.0；DCP 2.0；TAIC 5.0；MgO10；CaO 2。 EPDM 100；HAF 55；HSA 1；DCP 4；TAlC1.5；ZnO 5；MB 1；DOS 10。 由于EPDM与FPM本身极性相差很大，不易找到一种硫化体系使它们具有良好的硫化相容性，可是采用不同硫化体系时，彼此之间的影响又很大，使制得的静态硫化共混物的物理性能很差。比较有效的解决方法是使用动态硫化的方法，这种方法可以避免两种硫化体系的相互干扰，扩大了共混橡胶硫化体系的选择范围，制得具有良好性能的共混物。 在FPM/EPDM共混物中，当共混比为70/30时，由于FPM为连续相，共混物性能与FPM相近，其质量变化率、拉伸强度和拉断伸长率保持率以及耐油性均接近于纯FPM的水平。随着EPDM用量的增大，共混物的耐热空气老化性能和耐热油性能都变差。