2.1.1 The combined use of different grades of fluorine rubber It is well known that the combined use of similar rubbers is easy to achieve regardless of compatibility or co-vulcanization. If you choose different brands of fluorine rubber (such as 2601 and 2605) for combined use, you can reduce the hardness and tensile strength of some fluorine rubber compounds, increase the elongation at break, and improve the processability of fluorine rubber. Fluorine rubber 2601 has a fluorine mass fraction of 65% and a Mooney viscosity of 90, which has poor processing performance in production, while fluorine rubber 2605 has a fluorine mass fraction of 60% and a Mooney viscosity of only 40. After fluororubber 2601 and 2605 are used together, the relative molecular mass distribution is widened, which plays a certain internal plasticization effect, which can make the rubber easier to extrude. Studies have shown that the combined use will not affect the heat resistance of fluororubber 2601.

2.1.2 Combination of fluoroelastomer/fluoroelastomer fluoroelastomer was synthesized abroad in the early 1970s, which significantly improved the low temperature performance of fluoroelastomer. For example, the glass transition temperature of Vi-tonGLT raw rubber is about 14℃ lower than that of fluorine rubber F246, but its price is high. The Beijing Institute of Aeronautical Materials has developed fluoroelastomer FX-13 through the combined use of fluoroelastomer and fluoroether rubber, which improves the low-temperature performance of fluoroelastomer, and its brittleness temperature can reach -45°C. It has been successfully used to manufacture carrier rocket seals. And its price is much lower than fluoroether rubber. Basic formula (parts by mass) Fluorine rubber 100, acid acceptor 5~7; vulcanizing agent 2~2.8; carbon black 20-25. Fluoroether rubber 100; Acid acceptor 3～7; Organic peroxide 3～5; Vulcanizing agent 4～6; Carbon black 20～25; Combination ratio: 5:2; Vulcanization condition: 175±3℃/10Mpa× 20min.

氟橡胶之间的并用

2.1.1 不同牌号氟橡胶的并用 众所周知，同类橡胶的并用无论在相容性或共硫化方面都很容易实现。如果选择不同牌号氟橡胶(如2601和2605)进行并用，可以降低部分氟橡胶胶料的硬度、拉伸强度，提高拉断伸长率，从而改善氟橡胶的加工性。氟橡胶2601氟质量分数为65%，门尼粘度90，在生产中加工性能较差，而氟橡胶2605氟质量分数为60%，门尼粘度只有40。氟橡胶2601和2605并用后相对分子质量分布加宽，起到一定的内增塑作用，能使胶料更容易挤出。研究表明，并用后不会影响氟橡胶2601的耐热性。

2.1.2 氟橡胶/氟醚橡胶并用 国外于20世纪70年代初合成出了氟醚橡胶，使氟橡胶的低温性能得到明显改善。如Vi-tonGLT生胶玻璃化转变温度比氟橡胶F246降低了约14℃，但其价格高。北京航空材料研究院通过氟橡胶和氟醚橡胶并用，研制出氟橡胶FX-13，改善了氟橡胶的低温性能，其脆性温度可达-45℃，己成功的用于制造运载火箭密封件，而且其价格比氟醚橡胶大大降低。 基本配方(质量份) 氟橡胶100，酸受体5～7；硫化剂2～2.8；炭黑20-25。 氟醚橡胶100；酸受体3～7；有机过氧化物3～5；助硫化剂4～6；炭黑20～25； 并用比：5:2；硫化条件：175±3℃/10Mpa×20min。