A molding process of prepreg/smc composite material
A molding process and composite material technology, which is applied in the field of material processing, can solve the problems of low overall molding rate of composite material parts and structural damage of parts, and achieve the effects of improving interlayer shear strength, realizing structural weight reduction, and reducing production costs
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[0034] The preparation method of the modified carbon fiber described in the present invention: (1) ultrasonically vibrate 50g of carbon fiber in 2L of acetone for 2h, and dry it for later use; (2) disperse the product of step (1) in 2L of 45% concentrated nitric acid, Reflux and oxidize at 90°C for 60min, cool down naturally, wash with water until the pH is about 7, and dry for later use; (3) Disperse the product of step (2) in 2L tetrahydrofuran, add 15g lithium aluminum hydride, stir at 60°C for 2h, add 2L2mom / L of hydrochloric acid, stirred for 1.5h, filtered out the carbon fiber, soaked and washed in tetrahydrofuran for 18h, and dried for later use; (4) Take 720g of ethanol and 80g of alcohol solution, add 200g of silane coupling agent into it, stir and mix well To obtain the hydrolyzate of the silane coupling agent, disperse the product of step (3) in it, stir or ultrasonically vibrate for 30-60min, filter out the fiber and dry it.
[0035] A modified carbon fiber prepre...
Embodiment 1
[0038] Prepreg: Solvay Cytec MTM 23 (vinyl type), SMC sheet: Polynt- 24-12K (vinyl type, fiber content 50%).
[0039] (1) Paving: Cut the prepreg according to the layup design, cut and weigh the SMC sheet, and then place it at the designed position on the prepreg layup;
[0040] (2) Mold preparation: evenly coat the mold with release agent, fix the mold on the hot press, and heat the mold and the hot press to 130-135°C;
[0041] (3) Co-molding: put the prepreg + SMC sheet laid in step (1) quickly into the predetermined position in the mold, operate the hot press to close the mold and pressurize, the minimum pressure is 140kPa, and keep warm for 10min. The material is fully cured at 130-135°C;
[0042] (4) Demoulding: open the mold, keep the mold at 130-135°C, and use tools to take out the pressed parts.
[0043] The weighing in step (1) is based on the design requirements. When using SMC for corner filling, the required weight is calculated according to the thickness and a...
Embodiment 2
[0046] Prepreg: Solvay Cytec MTM 23 (vinyl type), SMC sheet: Polynt- 24-12K (vinyl type, fiber content 50%).
[0047] (1) Paving: Cut the prepreg according to the layup design, cut and weigh the SMC sheet, and then place it at the designed position on the prepreg layup;
[0048] (2) Mold preparation: evenly coat the mold with release agent, fix the mold on the hot press, and heat the mold and the hot press to 120-125°C;
[0049] (3) Co-moulding: quickly put the prepreg + SMC sheet laid in step (1) into the predetermined position in the mold, operate the hot press to close the mold, pressurize, the minimum pressure is 140kPa, and keep warm for 14min. The material is fully cured at 120-125°C;
[0050] (4) Demoulding: open the mold, keep the mold at 120-125°C, and use tools to take out the pressed parts.
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