1.Petrochina Lanzhou Chemical Research Center;2.School of chemistry and chemical engineering, Lanzhou University
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).