Advantageous Effects of Invention Since polyketone fiber has good adhesion to rubber and low elongation, pressure resistance, flexural resistance, rubber and fiber of air spring rubber film can be improved by using polyketone fiber as a fiber reinforcing material. Resistance to peeling, fatigue resistance and durability.
More specifically, the fiber reinforcing material of the present invention is composed of a composite fiber cord containing a polyketone fiber cord or a polyketone fiber. The polyketone-containing composite cord may be a composite cord composed of a polyketone fiber and other fibers. As the other fibers in the composite cord, nylon fibers are preferred. Further, in the composite fiber cord, the proportion of the polyketone fiber is preferably 34% or more with respect to the total fineness of the polyketone fiber and other fibers. The compound cord has a reclamation coefficient of 1500 or more.
The polyketone fiber to be used in the present invention preferably has a molecular structure of the formula (1). (CO-Rn) (1) As the rubber matrix of the rubber film, it is preferable to use natural rubber (NR), styrene butadiene rubber (SBR), butadiene rubber (BR), chlorosulfonated polyethylene rubber (CSM), Neoprene (CR), EPDM, EPDM, butyl rubber (IIR), acrylate rubber (ACM, ANM), ethylene acrylate rubber (AEM) and hydrogenated nitrile A heat resistant rubber such as rubber (HNBR) is a main component.
The polyketone fiber cord is formed by twisting a plurality of polyketone fiber strands, preferably firstly, and then retanning. The retanning coefficient is preferably 1500 or more, which is better than 18002300. If the enthalpy coefficient is less than 1500, the obtained rubber film is poor in flex fatigue resistance; if the retanning factor is too large, the strength will decrease, the elongation and creep will increase, so the retanning coefficient is 2300 or less. ideal. The enthalpy coefficient is calculated from the total fiber D (dtex) and the enthalpy G (time/10 cm) constituting the cord by the following formula: retanning coefficient = GD 0.9 (2) fiber reinforcing material for air spring and air The number of primary turns of the polyketone fiber cord of the spring is preferably the same as the number of retanning, but not necessarily the same. In addition, the total fineness of the polyketone fibers constituting the polyketone fiber cord depends on the strength required for the cord. For example, the air spring reinforcing fiber for a truck, a bus or a railway vehicle is preferably 18,050,10 dtex, and the air spring for a passenger car is preferably the best. It is 4001500dtex.
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