Various Specific Implementation Methods for Preparing Epoxy Resin

The technical solution of the present invention is not limited to the specific implementation methods listed below, but also includes any combination of various specific implementation methods.

Specific implementation method 1: The epoxy matrix resin of this implementation method is made of 40 parts by weight of phenolic epoxy resin, 60 parts by weight of bisphenol A epoxy resin, 2-10 parts by weight of core-shell polymer, 15-24 parts by weight of curing agent, and 3.0-6.0 parts by weight of curing accelerator. The curing agent is a composite curing agent of dicyandiamide and 4,4 '- diaminodiphenyl sulfone, with 4,4' - diaminodiphenyl sulfone and dicyandiamide being 18 and 6 parts by weight, 14 and 7 parts by weight, respectively 10 and 8, or 6 and 9; The curing accelerator is an organic urea or its derivative.

The particle size of the core-shell polymer described in this embodiment is 100-300nm. The core-shell polymer can be commercially available or prepared using existing publicly available preparation methods.

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.

Unused preparation methods for epoxy resin
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.

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