Research on bonding process of epoxy adhesive film for edge connection of cockpit transparent parts
The curing behavior of J-351 epoxy adhesive film was studied by using non isothermal differential scanning calorimetry method,and the theoretical curing temperature range of J-351 epoxy adhesive film was calculated by using T-β extrapolation method.Furthermore,experimental verification was conducted on the performance parameters related to curing temperature,surface treatment,and pressure method during the use of epoxy adhesive film for edge connection of cockpit transparent parts,and the optimal bonding process was determined.By conducting fatigue tests on typical structural components,the feasibility of the process was verified,which provided key process parameters for edge bonding of large-sized cockpit transparent parts.The research results showed that,(1)The curing reaction of J-351 epoxy adhesive film was a single exothermic peak.According to T-β extrapolation method,it showed that the theoretical reaction temperature range of J-351 epoxy adhesive film was 70.92-127.21℃.(2)When the curing temperature was 85℃and the curing time was 6 h,the shear strength of adhesive film could meet the requirements for edge connection of cockpit transparent parts.Adding pre-curing steps could effectively improve the wettability between adhesive film and organic glass or polyester ribbon.(3)The best effect was achieved by using 320 grit sandpaper for polishing and under vacuum pressure.(4)The relatively optimal process conditions were as follows:the surface of the organic glass was polished with 320 grit sandpaper,pre-cured at 70℃for 1 h,cured at 85℃for 6 h,and subject to vacuum bag pressure of 0.1 MPa.The shear strength of the edge connection adhesive component produced was about 234 kN/m,the fatigue cycle number of typical structural components could reach 150 000 times,and the fatigue ultimate load could reach 8.352 kN,which could meet the requirements for edge connection of cockpit transparent parts.
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