Fluororubber PVDF And Ethylene Propylene Rubber

- Nov 06, 2020-

Both fluororubber and ethylene propylene rubber can be modified with fluororubber and ethylene propylene diene monomer. The main purpose of the combination of fluororubber and ethylene propylene rubber is to improve the elasticity, low temperature resistance and reduce the cost of materials. It has been reported that the properties of the blends of ethylene propylene diene peroxide / Triallyl isocyanurate (DCP / talc) Co vulcanization system and tetrapropylene fluororubber are very good, which can improve the low temperature properties of tetrafluoro rubber and reduce the price. When 20% ethylene propylene rubber is used in tetrafluoropropylene rubber, the comprehensive properties of the blends are better, and other blends have certain development value. Because EPDM is a kind of general rubber with excellent performance, it has high chemical stability, heat resistance, weather resistance, ozone resistance, water resistance, steam resistance, chemical resistance and many other excellent properties. Compared with tetrafluoropropylene rubber, its typical characteristics are better resistance to polar medium and superior low temperature performance. The tetrapropylene fluororubber is equivalent to the copolymer of fluorine substituent of ethylene molecule and propylene. Therefore, the similarity in composition and structure of the two rubbers provides a basis for their compatibility. By blending EPDM with FPM, the excellent corrosion resistance of FPM can be ensured theoretically, and the low temperature resistance and elasticity of the material can be improved, the processing performance can be improved and the material cost can be reduced. In general, DCP / talc is also used in the vulcanization system of FPM / EPDM. The brittleness temperature can be reduced to - 40 ℃ when the ratio of FPM / EPDM is 50:50. Basic formula (mass fraction): tetrafluoropropylene rubber 100; n-99030, 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。  Because the polarity of EPDM and FPM is very different, it is difficult to find a vulcanization system to make them have good vulcanization compatibility. However, when different vulcanization systems are used, the influence between them is great, which makes the physical properties of static vulcanized blends very poor. The more effective solution is to use dynamic vulcanization, which can avoid the mutual interference between the two vulcanization systems, expand the selection range of vulcanization system of rubber blends, and prepare blends with good properties. In FPM / EPDM blends, when the blending ratio is 70 / 30, due to the continuous phase of FPM, the properties of the blends are similar to those of FPM, and the mass change rate, tensile strength, elongation at break retention rate and oil resistance are close to those of pure FPM. With the increase of EPDM content, the heat-resistant air aging properties and heat-resistant oil properties of the blends become worse.