Preparation of Phenolic Epoxy Resin
Nov 28, 2023
Specific implementation method 7: The difference between this implementation method and specific implementation method 6 is that in step 1, 40 parts of phenolic epoxy resin, 60 parts of bisphenol A epoxy resin, 3-8 parts of core-shell polymer, 18-22 parts of curing agent, and 4.0-5.0 parts of curing accelerator are weighed by mass. The other parameters are the same as the specific implementation method 6.
In this embodiment, it is preferable to weigh 40 parts of phenolic epoxy resin, 60 parts of bisphenol A epoxy resin, 5 parts of core-shell polymer, 24 parts of curing agent, and 5.0 parts of curing accelerator by mass in step 1.
Specific implementation method 8: The difference between this implementation method and specific implementation methods 6 or 7 is that the core-shell polymer in step 1 is soft core made of polybutadiene rubber, styrene butadiene rubber or polymethyl siloxane, and hard shell made of polymethyl methacrylate. The other parameters are the same as those of specific embodiments 6 or 7.
Specific implementation method 9: This implementation method differs from specific implementation methods 6, 7, or 8 in that the epoxy value of the phenolic epoxy resin in step 1 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 6, 7, or 8.
Specific implementation method 10: The difference between this implementation method and one of specific implementation methods 6 to 9 is that the curing accelerator described in step 1 is N, N '- dimethyldiphenylurea, NN' - diethyldiphenylurea, N-p-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 of one of the six full nine.
Specific implementation method 11: This implementation method is a prepreg, which is made of epoxy matrix resin and fiber woven fabric, with a controlled volatile content of less than 1%. The epoxy matrix resin has a mass content of 37% to 43%, and the epoxy matrix resin is made of 40 parts of formaldehyde 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, wherein 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.
The core-shell polymer described in this embodiment is a commercially available product or can be prepared using existing publicly available preparation methods
The core-shell polymer is made of polybutadiene rubber, styrene butadiene rubber, or polymethyl siloxane as a soft core, and polymethyl methacrylate as a hard shell.
The prepreg of this implementation method has stable performance and can be stored for 3 months under normal conditions (25 ° C), and for 6 months below -18 ° C.
This implementation method is based on the "HB7736.4 Test Method for Physical Properties of Composite Premixes - Part 4: Determination of Volatile Content" to determine the volatile content of the prepreg, and the volatile content in the prepreg is less than 1% by mass.
This implementation method is based on the "HB7736.5 Test Method for Physical Properties of Composite Prepreg Part 5: Determination of Resin Content" to determine the resin content of the prepreg, and the mass content of epoxy matrix resin in the prepreg is 37%~43%. [0051] In this embodiment, the gel time of the 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 the prepreg at 120 ° C is 9~20min.
At least three layers of prepreg blank obtained by stacking the prepregs of this embodiment are cured for 2-3 hours at 120 ° C using a hot pressing tank process to obtain a composite laminate. The tensile strength of the obtained composite laminates is 500~600MPa, and the tensile modulus is 22~26GPa; The bending strength reaches 700-800MPa, and the bending modulus reaches 24-28GPa; The shear strength of the layer is 72~82MPa.
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