Performance Testing of Epoxy Matrix Resin Cured Products
Jan 11, 2024
Perform performance testing on the cured product of the epoxy matrix resin in this embodiment cured at 120 ° C for 2 hours, using the methods and parameters recorded in specific embodiment 1. The test result is that the glass transition temperature of the cured product of the epoxy matrix resin in this embodiment (cured at 120 ° C for 2 hours) is 137.3 ° C; Impact strength 16.8KJ/m; Tensile strength 75.6MPa, tensile modulus 3.5GPa; Breaking elongation force 3.2%; The bending strength is 126.4MPa, and the bending modulus is 3.4GPa.
The epoxy matrix resin of this embodiment has good performance. The preparation method of the epoxy matrix resin in this embodiment is as follows:
1.Weigh 40 parts of F-44 phenolic epoxy resin, 51 parts of B-51 epoxy resin, 12 parts of Kane Ace MX-960 matrix mixture produced by Kaneka Company in Japan, 16 parts of 4,4 '- diaminodiphenyl sulfone curing agent, 8 parts of dicyandiamide curing agent, and 5.0 parts of 3-phenyl-1,1-dimethylurea curing accelerator by weight;
3.Mix 40 portions of F-44 phenolic epoxy resin, 51 portions of bisphenol A epoxy resin, and 12 portions of Kane Ace MX-960 matrix mixture produced by Kaneka Company in Japan, weighed in step 1, into a container, and then heat to 150 ° C under stirring conditions. Then, add 16 portions of 4,4 '- diaminodiphenyl sulfone curing agent weighed in step 1, continue stirring and heating to 150 ° C, keep it warm for 3-5 minutes, and then cool to room temperature to obtain B-order resin;
3、 Take 30 portions of the B-order resin obtained in step 2 and place them in a three-roller grinder. Then, add 8 portions of the dicyandiamide curing agent weighed in step 1 and 5 portions of the 3-phenyl-1,1-dimethylurea curing accelerator weighed in step 1. Grind them in a three-roller grinder for 4 times, and then add the remaining B-order resin prepared in step 2. Contiue grinding them in a three-roller grinder for 4 times to obtain an epoxy matrix resin; The temperature of the three roller grinding machine mentioned in step three is maintained at 60-70 ° C. The number of parts in the B-order resin obtained from step two of the 30 parts mentioned in step three is the same as the benchmark used for weighing in step one.
The core-shell polymer described in this embodiment consists of a 25% content of Li Kana Ace MX-960 core-shell polymer produced by Kaneka Company in Japan, with a soft core of polymethyl siloxane and a hard shell of polymethyl methacrylate, with a particle size of 300nm; The content of bisphenol A epoxy resin is 75% by mass.
The prepreg was prepared using the preparation method described in specific embodiment 23, wherein the preparation method of the epoxy matrix resin was carried out using the method described in this embodiment. The prepared prepreg is made of epoxy matrix resin and SW110 glass fiber woven fabric (density 110g/m) according to specific implementation method 24, with a volatile content of less than 1%, of which the epoxy matrix resin has a mass content of 37%~43%. The gel time of prepreg is measured according to "HB 7736.7 Test Method for Physical Properties of Composite Prepreg Part 7: Determination of gel Time", and the gel time of prepreg at 120 ° C is 9~20min.
After stacking the prepreg obtained in this embodiment, at least 3 layers of prepreg blank are obtained, and cured for 3 hours at 120 ° C using a hot pressing tank process to obtain a composite laminate. The obtained composite laminate has a tensile strength of 570.3 MPa and a tensile modulus of 24.1 GPa; Bending strength 765MPa, bending modulus 25.02GPa; The layer shear strength is 81.2MPa.
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