Inflatable fenders

Abstract

The present invention provides an air-filled fender that hardly deteriorates a fiber-reinforced layer even after steam vulcanization, has excellent fatigue resistance, and can be practically used under severe service conditions. Embedded in the fiber-reinforced layer (7) between the inner rubber layer and the outer rubber layer (6) of the inflatable fender (1), at least one longitudinal line (8) of the fiber-reinforced layer (7) passes through the PEN Composed of stranded cords (9) composed of fibers, the stranded cords (9) have a tensile strength of 210N or more, an elongation at break of 14% to 20%, and an intermediate elongation when stretched at 67N Make it 3% or less.

Description

technical field [0001] The present invention relates to an air-filled fender, and more specifically, to an air-filled fender that is hard to deteriorate a fiber-reinforced layer even after steam vulcanization, has excellent fatigue resistance, and can be practically used under severe service conditions material. Background technique [0002] Currently, the fiber-reinforced layer of inflatable fenders uses twisted cords composed of PET (polyethylene terephthalate) fibers that are relatively high in strength and elongation, good in dimensional stability, and low in cost. However, unlike rubber products such as tires, which are pressed by airbags in a mold and vulcanized at a specified temperature and pressure, pneumatic fenders are produced by steam vulcanization in a vulcanization box. Therefore, there is a problem that PET fibers, which are easily deteriorated by amines contained in vulcanization accelerators and the like in rubber, further accelerate deterioration by steam...

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the PET fiber, which is easily deteriorated by the amine contained in the vulcanization accelerator, etc. in the rubber, further accelerates the deterioration by steam vulcanization, thereby reducing the tensile strength and the adhesiveness to the rubber.

In addition, it will be significantly deformed by repeated forceful pressing, so attention must also be paid to fatigue resistance

In this way, the traditional PEN fiber cannot be used as the fiber reinforced layer of the inflatable fender to meet its important performance and cannot be used in practice

[0004] A PEN fiber with increased elongation has been proposed (refer to Patent Document 1). However, the twisted cord of the PEN fiber proposed in this document has a high elongation, but the tensile strength is not sufficient.

Therefore, the PEN fiber cannot be practically used for the fiber-reinforced layer of the inflatable fender

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