Selection and performance of CFRP matrix in bearing layer of type Ⅳ hydrogen storage cylinder
Using SW resin and HY4006 resin as matrix resins and 12K T700 carbon fiber(HY-1,HY-2,HY-3)as fiber rein-forcement,a carbon fiber reinforced composite material(CFRP)for the bearing layer of type Ⅳ hydrogen storage cylinders was prepared.The resin matrices were screened from the aspects of curing characteristics,heat resistance,rheological properties and mechanical properties of resin castings.The optimal CFRP system was selected based on the resin infiltration on fibers and the mechanical properties,micro-morphology,porosity of CFRP,etc.The results showed that SW resin was more suitable for the winding process of type Ⅳ hydrogen storage cylinders than HY4006 resin due to its curing temperature of 109-142 ℃,high cu-ring rate,short curing time,slow viscosity growth and good mechanical properties of the casting body;SW resin had better infil-tration on HY-2 carbon fiber,with an initial contact angle of 80.06° and an infiltration time of only 2.5 s;and the CFRP pre-pared from SW resin and HY-2 carbon fiber possessed a tensile strength of 2 650 MPa,shear strength of 64.63 MPa,density of 1.67 g/cm3 and fiber volume fraction of 63.61％,indicating a good interfacial bonding,low porosity and excellent mechanical properties,making it an ideal material for the winding layer of type Ⅳ hydrogen storage cylinders.
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