Background Technology of Epoxy Matrix Resin

Oct 12, 2023

technical field
The present invention relates to an epoxy matrix resin, a prepreg, a preparation method thereof, and a device for preparing the prepreg.

Background technology
Epoxy/glass fiber composite materials have the characteristics of light weight, high strength, high modulus, good corrosion resistance, excellent electrical properties, wide range of raw materials, good processability, simple processing and molding, high production efficiency, and strong material designability and special functionalities such as shielding electromagnetic waves and noise reduction. They have become irreplaceable important materials in the national economy, national defense construction, and technological development, It is currently one of the most widely used composite materials.

Medium temperature cured epoxy matrix resin has been widely used in glass fiber reinforced composite prepregs due to its advantages such as low curing temperature, short molding cycle, and meeting storage requirements. However, due to the brittleness of the cured products of the non toughened epoxy matrix resin, the composite material made from it is damaged due to the premature failure of the epoxy matrix resin. Therefore, the toughening modification of epoxy matrix resin is particularly important.

At present, epoxy matrix resins can be toughened through rubber elastomers, thermoplastic plastics, etc. The latest data also indicates that using hyperbranched polymers to toughen epoxy resins has achieved good results. Whether traditional liquid rubber or thermoplastic, their blends with epoxy resin undergo phase separation during curing. Under normal circumstances, toughening agents precipitate from the blends, and phase separation and curing reactions are competitive processes. Therefore, the aggregated structure and performance of the cured product depend on the curing specifications, the properties of the added toughening agent, and its dosage. Only by strictly controlling these factors can the best toughening effect be achieved.

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; The composite material made of 4 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. L0006 "The existing hot melt prepreg method mostly uses two production devices: adhesive film machine and hot melt prepreg machine. Firstly, the prepreg matrix resin is filmed on the adhesive film machine, and then the adhesive 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 thickness of the adhesive film; 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.

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