Performance Testing of Epoxy Matrix Resin Cured Products 

Performance testing was conducted 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 results are as follows:

• Glass transition temperature: 137.3 °C
• Impact strength: 16.8KJ/m
• Tensile strength: 75.6MPa
• Tensile modulus: 3.5GPa
• Breaking elongation force: 3.2%
• Bending strength: 126.4MPa
• Bending modulus: 3.4GPa

The epoxy matrix resin in this embodiment exhibits commendable performance. The preparation method of the epoxy matrix resin is outlined below:

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.

2. Mix the weighed portions from step 1 into a container, comprising 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. Heat the mixture to 150 °C under stirring conditions. Add 16 portions of 4,4'-diaminodiphenyl sulfone curing agent, continue stirring and heating to 150 °C, keep warm for 3-5 minutes, then cool to room temperature to obtain B-order resin.

3. Take 30 portions of the B-order resin obtained in step 2, place them in a three-roller grinder, and add 8 portions of dicyandiamide curing agent and 5 portions of 3-phenyl-1,1-dimethylurea curing accelerator. Grind in a three-roller grinder for 4 times, then add the remaining B-order resin from step 2. Continue grinding for 4 times to obtain an epoxy matrix resin. The temperature of the three-roller grinding machine is maintained at 60-70 °C.

The core-shell polymer described in this embodiment comprises 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 mass content of bisphenol A epoxy resin is 75%.

Prepreg preparation, following the method described in specific embodiment 23, was carried out using the epoxy matrix resin preparation method from this embodiment. The resulting prepreg, made of epoxy matrix resin and SW110 glass fiber woven fabric (density 110g/m^2) according to specific implementation method 24, has a volatile content of less than 1%, with the epoxy matrix resin mass content ranging from 37% to 43%. The gel time of the prepreg, measured according to "HB 7736.7 Test Method for Physical Properties of Composite Prepreg Part 7: Determination of Gel Time," at 120 °C is 9~20 minutes.

After stacking the prepreg obtained in this embodiment, at least 3 layers of prepreg blanks are obtained, and cured for 3 hours at 120 °C using a hot pressing tank process to obtain a composite laminate. The resulting composite laminate has a tensile strength of 570.3 MPa, tensile modulus of 24.1 GPa, bending strength of 765MPa, bending modulus of 25.02GPa, and layer shear strength of 81.2MPa.

Specific Implementation Method 25: In this embodiment, the epoxy matrix resin consists of 40 parts by mass of F-44 phenolic epoxy resin, 60 parts by mass of E-51 epoxy resin, 5 parts by mass of core-shell polymer, 16 parts by mass of 4,4'-diaminodiphenylsulfone curing agent, 8 parts by mass of dicyandiamide curing agent, and 5.0 parts by mass of 3-phenyl-1,1-dimethylurea curing accelerator. The core-shell polymer, made of polybutadiene rubber as the soft core and a hard shell with polymethyl methacrylate, is added as a parent mixture of Kane Ace MX-125 produced by Kaneka Company in Japan. The mass content of Kane Ace MX-125 core-shell polymer is 25%, with a particle size of 100nm. The mass content of B-51 epoxy resin is 75%.

Performance testing on the cured product of the epoxy matrix resin, cured at 120 °C for 2 hours, was conducted following the methods and parameters recorded in specific embodiment 1. The results indicate a glass transition temperature of 137.3 °C, impact strength of 16.8KJ/m, tensile strength of 83.5MPa, tensile modulus of 3.4GPa, breaking elongation force of 3.5%, bending strength of 126.4MPa, and bending modulus of 3.4GPa. The epoxy matrix resin in this embodiment exhibits excellent performance.

The difference between the preparation method in this embodiment and that in specific embodiment 22 lies in step 1. Specifically, in this embodiment, 40 parts of F-44 phenolic epoxy resin, 45 parts of E-51 epoxy resin, 20 parts of Kane Ace MX-125 matrix mixture, and 16 parts of 4,4'-diaminodiphenyl sulfone are weighed, along with 8 parts of dicyandiamide curing agent and 5.0 parts of 3-phenyl-1,1-dimethylurea curing accelerator. Subsequent steps involve adding the corresponding mass fractions of the substances weighed in step 1.

Prepreg preparation, as described in specific embodiment 23, was conducted using the epoxy matrix resin preparation method from this embodiment. The resulting prepreg, made of epoxy matrix resin and SW110 glass fiber woven fabric (density 110g/m^2) following specific implementation method 25, has a volatile content of less than 1%, with the epoxy matrix resin mass content ranging from 37% to 43%. The gel time of the prepreg, measured according to "HB 7736.7 Test Method for Physical Properties of Composite Prepreg Part 7: Determination of Gel Time," at 120 °C is 9~20 minutes.

After stacking the prepreg obtained in this embodiment, at least 3 layers of prepreg blanks are obtained. The composite laminate is formed by curing at 120 °C for 3 hours using a hot pressing tank process. The resulting composite laminate has a tensile strength of 598.3MPa, tensile modulus of 23.5GPa, bending strength of 785MPa, bending modulus of 24.2GPa, and layer shear strength of 81.2MPa.

Specific Implementation Method 26: A comparative experiment was conducted in this implementation method using an epoxy matrix resin composed of 40 parts of F-44 phenolic epoxy resin, 60 parts of B-51 epoxy resin, 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.

Performance testing on the cured product of the epoxy matrix resin, cured at 120 °C for 2 hours, was carried out following the methods and parameters recorded in specific embodiment 1. The results show a glass transition temperature of 137.8 °C, impact strength of 11.5KJ/m^2, tensile strength of 62.5MPa, tensile modulus of 3.6GPa, elongation at break of 2.7%, bending strength of 108.0MPa, and bending modulus of 3.5GPa.

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