Multiple Preparation Methods of Epoxy Matrix Resin
The technical solution presented in this invention is not confined to the specific implementation methods outlined below but encompasses any combination of the various specific implementation methods.
Specific Implementation Method 1:
In this method, the epoxy matrix resin comprises 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 of dicyandiamide and 4,4'-diaminodiphenyl sulfone, with weight proportions of 4,4'-diaminodiphenyl sulfone and dicyandiamide being 18:6, 14:7, 10:8, or 6:9. The curing accelerator is an organic urea or its derivative. The particle size of the core-shell polymer ranges from 100-300nm, and it can be obtained commercially or prepared using publicly available methods.
Performance testing on the cured product of the epoxy matrix resin involves curing at 120 °C for 2-3 hours. Test parameters include:
- Glass Transition Temperature: Measured using DMA method with a three-point bending loading mode, sample size (18 ± 0.5mm) × (50.2mm), frequency 1Hz, heating rate 5 °C/min.
- Tensile Strength, Tensile Modulus of Elasticity, and Elongation: Tested according to GB/T2568 resin casting body tensile performance test method.
- Bending Strength and Modulus: Tested according to GB/T2570 resin casting body bending performance test method.
- Impact Strength: Tested according to GB/T2571 Resin Castable Impact Test Method, with a specimen size of 80mm ± 2mm in length, 10mm ± 0.5mm in width, and 0.2mm in thickness.
Test Results:
The cured product of the epoxy matrix resin in this embodiment (curing condition: 2-3 hours at 120 °C) exhibited a glass transition temperature of 133-138 °C, impact strength of 10-22 KJ/m², tensile strength of 65-85 MPa, tensile modulus of 3.0-3.6 GPa, elongation at break of 2.6-4.6%, bending strength of 100-140 MPa, and bending modulus of 2.6-3.6 GPa. This epoxy matrix resin demonstrates excellent performance.
Unused Preparation Methods for Epoxy Resin
Specific Implementation Method 2:
This method differs from method 1 in that the epoxy matrix resin comprises 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. Other parameters remain the same.
More Advantageous Aspect in this Embodiment:
An improved epoxy matrix resin formulation comprises 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:
Differing from methods 1 and 2, this approach utilizes a core-shell polymer with a soft core of polybutadiene rubber, styrene-butadiene rubber, or polymethyl siloxane, and a hard shell made of polymethyl methacrylate. Other parameters align with specific implementation method 1.
Specific Implementation Method 4: In this method, the epoxy value of the phenolic epoxy resin ranges from 0.42 to 0.54, and the epoxy value of the bisphenol A epoxy resin ranges from 0.41 to 0.56. All other parameters remain consistent with specific implementation methods 1, 2, or 3.
Specific Implementation Method 5: Distinguishing itself from methods 1 to 4, this approach incorporates 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 as the curing accelerator. Other parameters align with those specified in specific implementation method 1.
Specific Implementation Method 6: This method mirrors the preparation steps outlined in specific implementation method 1. It involves weighing 40 parts phenolic epoxy resin, 60 parts bisphenol A epoxy resin, 2-10 parts core-shell polymer, 15-24 parts curing agent, and 3.0-6.0 parts curing accelerator. The curing agent comprises a combination of dicyandiamide and 4,4'-diaminodiphenylsulfone, with varying mass fractions. The curing accelerator is an organic urea or its derivative. The three-roller grinder temperature is maintained at 60-70 °C.
The simplicity and ease of operation characterize this embodiment. The commercially available or easily prepared core-shell polymer in step 1 contributes to its user-friendly nature. The performance testing, as per specific implementation method 1 parameters, showcases excellent properties in the cured epoxy matrix resin, with a glass transition temperature of 133-138 °C, impact strength of 10-22 KJ/m, tensile strength of 65-85 MPa, tensile modulus of 3.0-3.6 GPa, elongation at break of 2.6-4.6%, and bending strength and modulus ranging from 100-140 MPa and 2.6-3.6 GPa, respectively. The epoxy matrix resin of this embodiment exhibits superior performance.
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