Preparation Technology of Epoxy Matrix Resin Prepreg
Nov 9, 2023
Prepreg is an intermediate substrate for preparing composite materials, and its quality directly affects the quality of composite components. The production processes of prepreg mainly include solution impregnation method and hot melt method. Compared to the solution method, the hot melt method has the following advantages:
1. Accurate control of resin content in the prepreg;
2. Low volatile content;
3. Environmental protection and pollution-free environmental issues;
4. The composite material produced has good moisture and heat resistance, fast production speed, and high efficiency.
Therefore, the hot melt prepreg process is the current development direction of prepreg.
Most of the existing hot melt prepreg materials are produced using two production devices: a film machine and a hot melt prepreg machine. Firstly, the prepreg matrix resin is filmed on the film machine, and then the film and fiber woven fabric are composite prepreg on the hot melt prepreg machine at a certain temperature, speed, and pressure. The resin content of the prepreg can be controlled by adjusting the film thickness; Another process involves impregnating the fiber woven fabric with hot melt matrix resin under the action of a transmission device, and then transmitting it to a scraping device to remove excess resin from the fiber woven fabric to control the resin content of the prepreg. The above devices have high manufacturing costs, complex production processes, and imprecise control of resin content in the prepreg.
The purpose of the present invention is to solve the problem of uneven toughening phase state and even no phase separation in existing epoxy matrix resin cured products, resulting in poor performance of epoxy matrix resin cured products that cannot meet the performance requirements of composite materials, as well as the complex preparation methods and processes of existing prepregs, imprecise control of resin content in prepregs, and high manufacturing costs of existing devices for preparing prepregs, The present invention provides an epoxy matrix resin, a prepreg, a preparation method thereof, and a device for preparing the prepreg.
The epoxy matrix resin of the present invention is made from 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 combination 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, 10 and 8 parts by weight, or 6 and 9 parts by weight, respectively; The curing accelerator is an organic urea or its derivative.
The preparation method of the epoxy matrix resin of the present invention is achieved by the following steps:
1. Weighing 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 according to the mass fraction, the curing agent is a complex curing agent of dicyandiamide and 4,4 '- diaminodiphenyl sulfone, wherein the mass fractions of 4,4' - diaminodiphenyl sulfone and dicyandiamide are 18 parts and 6 parts, respectively 14 and 7 portions, 10 and 8 portions, or 6 and 9 portions, wherein 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.
The preparation method of the epoxy matrix resin of the present invention involves 30 parts, and the number of parts in the B-order resin obtained in step 2 is the same as the reference used for weighing in step 1.
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