A composite material sandwich structure and its preparation method and application
A technology of composite materials and structures, applied in the field of composite materials, can solve problems such as low degree of production automation, long molding cycle, and insufficient rigidity, and achieve the effect of improving market competitiveness, light weight, and good rigidity
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Embodiment 1
[0039] Taking epoxy resin as the matrix, adding 10wt% lightweight filler (composed of 60wt% hollow glass microspheres and 40wt% mixture composed of talcum powder, aluminum powder, silicon carbide powder and silicon nitride) to the epoxy resin matrix, and 40wt% carbon fiber (size 3-5mm), heated to 120°C in the mold, maintained at a pressure of 50kg, and mixed for 30 minutes to form a core material, the specific gravity of the core material is 1.1g / cm 3, the thickness is 1.0mm, the elastic modulus is 23000 MPa according to ASTM D 638 test, and the shear modulus is 80 MPa according to ASTMD 638 test;
[0040] In a mold with a smooth surface, the upper and lower sides of the above-mentioned core material are covered with a transition film adhesive layer (thickness 0.05mm) composed of 40wt% thermosetting epoxy resin and glass fiber woven cloth (50gsm), and then A resin-based fiber reinforcement composed of epoxy resin and carbon fiber is pasted on the adhesive layer of the transiti...
Embodiment 2
[0042] Based on epoxy resin, by adding 30wt% lightweight filler (consisting of 70wt% hollow glass microspheres and 30wt% mixture composed of talcum powder, aluminum powder, silicon carbide powder and silicon nitride) in the epoxy resin matrix and 20wt% carbon fiber (size 50mm), heated to 130°C in the mold, maintained at a pressure of 80kg, and molded for 40 minutes to form a core material. The specific gravity of the core material is 0.8g / cm 3 , the thickness is 1.0mm, the elastic modulus is 12000 MPa according to ASTM D 638 test, and the shear modulus is 60 MPa according to ASTM D 638 test;
[0043] The resin-based fiber reinforcement composed of epoxy resin and carbon fiber 3K woven cloth, the transition adhesive film bonding layer (thickness 0.1mm) composed of 50wt% thermosetting epoxy resin and carbon fiber 3K woven cloth, and the above-mentioned core material were placed on a smooth surface. Composite heating and curing in the surface plate mold, the heating pressure is c...
Embodiment 3
[0045] Based on epoxy resin, by adding 50wt% lightweight filler (consisting of 80wt% hollow glass microspheres and 20wt% mixture composed of talcum powder, aluminum powder, silicon carbide powder and silicon nitride) in the epoxy resin matrix and 10wt% basalt fiber (size 20mm) are heated to 140°C in the mold, the pressure is maintained at 30kg, and the molding time is 50min to form a core material. The specific gravity of the core material is 0.6g / cm 3 , the thickness is 1.0mm, the elastic modulus is 6500 MPa according to ASTM D 638 test, and the shear modulus is 30 MPa according to ASTM D 638 test;
[0046] The resin-based fiber reinforcement composed of epoxy resin and basalt fiber woven cloth, the transition adhesive film bonding layer (thickness 0.06mm) composed of 60wt% thermosetting epoxy resin and glass fiber woven cloth (specification 100gsm), and the above core The material is compositely heated and solidified in a flat mold with a smooth surface, the heating pressure...
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