全氟聚醚-b-聚硅氧烷在丁腈橡胶中的性能

Properties of perfluoropolyether-b-polysiloxane in nitrile rubber

摘要:

以全氟聚醚烯丙基醚和三种不同硅氢含量的双端硅氢聚硅氧烷(PSi-H)为原料,制备了三种双端硅氢全氟聚醚-b-聚硅氧烷(PFPE-b-PSi-H)减磨剂,添加到丁腈橡胶(NBR)配方中共同硫化,制备含氟改性NBR。采用红外光谱和核磁氢谱表征了PFPE-b-PSi-H的结构,并对含氟改性NBR的磨损、摩擦系数、拉伸性能、硬度、动态力学和热性能进行测试。结果表明：当选用硅氢含量为0.079%的PSi-H时,所制备PFPE-b-PSi-H使NBR的性能达到较佳的效果。当添加量为2%时,其阿克隆磨耗体积从0.25cm-3降低到0.121cm-3,静摩擦系数从2.589降低到1.402,动摩擦系数从2.176降低到1.209,拉伸强度从21.4MPa提高到24.2MPa,邵氏硬度A从81降低到79,玻璃化转变温度从1.7℃提高到5.7℃,损耗因子从0.73提高到0.78,Td10%提高65℃,残炭率提高10%。说明该减磨剂能够降低NBR内部摩擦阻力及表面磨损,优于索尔维的A10-P产品(损耗因子为0.75)。

Abstract:

Using perfluoropolyether allyl ether and three kinds of double-terminated silohydropolysiloxane (PSi-H) as raw materials, three kinds of double-terminated silohydroperfluoropolyether-b-polysiloxane (PFPE-b-PSi-H) antifriction agents were prepared and then added into the formula of nitrile butadiene rubber (NBR) to vulcanize together to prepare fluorinated modified NBR. The structure of PFPE-b-PSi-H was characterized by IR and 1H NMR, and the wear, friction coefficient, tensile properties, hardness, dynamic mechanical and thermal properties of fluorine-modified NBR were tested. The results show that when PSi-H with 0.079% silicon hydrogen content is selected, the prepared PFPE-b-PSi-H makes the performance of NBR reach a better effect. When the addition amount is 2%, the Akron abrasion volume decreases from 0.25 cm-3 to 0.121 cm-3, the static friction coefficient decreases from 2.589 to 1.402, the dynamic friction coefficient decreases from 2.176 to 1.209, the tensile strength increases from 21.4 MPa to 24.2 MPa, and the Shore A hardness decreases from 81 to 79. The glass transition temperature is increased from 1.7℃ to 5.7℃, the loss factor is increased from 0.73 to 0.78, the Td10% is increased by 65℃, and the residual carbon rate is increased by 10%. It shows that the friction reducer can reduce the internal friction resistance and surface wear of NBR, and it is superior to Solway A10-P product (loss factor is 0.75).