Performance Testing of Epoxy Matrix Resin
Dec 22, 2023
Perform performance testing on the cured product of the epoxy matrix resin in this embodiment cured at 120 ° C for 2-3 hours. The testing method and parameters are as follows: 1. Use DMA method (dynamic mechanical analysis method) to measure the glass transition temperature, use three-point bending loading mode, and sample size (18 ± 0.5mm) × (5 0.2m) (1.5 ± 0.2mm), frequency 1Hz, heating rate 5 ° C/min; 2. Test the tensile strength, tensile modulus of elasticity, and elongation according to the GB/T2568 resin casting body tensile performance test method; 3. Test the bending strength and modulus according to the GB/T2570 resin casting body bending performance test method; 4. The impact strength is tested according to the GB/T2571 Resin Castable Impact Test Method. The size of the impact strength specimen is 80mm ± 2mm in length, 10mm ± 0.5mm in width, and 0.2mm in thickness.
Test results: The glass transition temperature of the cured product of the epoxy matrix resin in this embodiment (curing condition: 2-3 hours at 120 ° C) is 133-138 ° C, the impact strength is 10-22KJ/m2, the tensile strength is 65-85MPa, the tensile modulus is 3.0-3.6GPa, the elongation at break is 2.6-4.6%, the bending strength is 100-140MPa, and the bending modulus is 2.6-3.6GPa. The epoxy matrix resin of this embodiment has good performance.
Specific implementation method 2: The difference between this implementation method and specific implementation method 1 is that the epoxy matrix resin is made of 40 parts by weight of phenolic epoxy resin, 60 parts by weight of bisphenol A epoxy resin, 3-8 parts by weight of core-shell polymer, 18-22 parts by weight of curing agent, and 4.0-5.0 parts by weight of curing accelerator. The other parameters are the same as the specific implementation method 1.
The more advantageous aspect in this embodiment is that the epoxy matrix resin is made of 40 parts by weight of phenolic epoxy resin, 60 parts by weight of bisphenol A epoxy resin, 5 parts by weight of core-shell polymer, 24 parts by weight of curing agent, and 5.0 parts by weight of curing accelerator.
Specific implementation method 3: The difference between this implementation method and specific implementation method 1 or 2 is that the core-shell polymer is made of soft core of polybutadiene rubber, styrene butadiene rubber, or polymethyl siloxane, and the hard shell is made of polymethyl methacrylate. The other parameters are the same as the specific implementation method 1.
Specific implementation method 4: The difference between this implementation method and specific implementation methods 1, 2, or 3 is that the epoxy value of the phenolic epoxy resin is 0.42~0.54, and the epoxy value of the bisphenol A epoxy resin is 0.41~0.56. The other parameters are the same as those of specific embodiments 1, 2, or 3.
Specific implementation method 5: The difference between this implementation method and specific implementation methods 1 to 4 is that the curing accelerator is N, N '- dimethyldiphenylurea, N, N' - diethyldiphenylurea, N-para chlorophenyl N, N '- dimethylurea, 3-phenyl-1,1-dimethylurea, 3-phenyl-1,1-dimethylurea (chlorourea) or thiourea. The other parameters are the same as the specific implementation method 1, all four.
Specific implementation method 6: This implementation method is the preparation method of the epoxy matrix resin described in specific implementation method 1. The preparation method of the epoxy matrix resin is achieved through the following steps: 1. Weigh 40 parts of phenolic epoxy resin, 60 parts of bisphenol A epoxy resin, 2-10 parts of core-shell polymer, 15-24 parts of curing agent, and 3.0-6.0 parts of curing accelerator by mass, The curing agent is a combination curing agent of dicyandiamide and 4,4 '- diaminodiphenylsulfone,Among them, the mass fractions of 4,4 '- diaminodiphenylsulfone and dicyandiamide are 18 and 6, 14 and 7, 10 and 8, or 6 and 9, respectively. The curing accelerator is an organic urea or its derivative;
2、Mix 40 portions of phenolic epoxy resin, 60 portions of bisphenol A epoxy resin, and 2-10 portions of core-shell polymer weighed in step 1 into a container, and then heat them to 150 ° C under stirring conditions. Then, add the 4,4 '- diaminodiphenylsulfone curing agent weighed in step 1, continue stirring and heating to 150 ° C, hold for 3-5 minutes, and 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 the dicyandiamide curing agent weighed in step 1 and the 3.0-6.0 portions of the curing accelerator weighed in step 1. Grind the resin in a three-roller grinder for 3-6 times, and then add the remaining B-order resin prepared in step 2. Continue grinding the resin in a three-roller grinder for 3-6 times to obtain the epoxy matrix resin; The temperature of the three roller grinding machine mentioned in step three is maintained at 60-70 ° C.
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