Cured Epoxy Matrix Resin
Dec 21, 2023
The epoxy matrix resin of the present invention has a glass transition temperature of 133-138 ° C, an impact strength of 10-22KJ/m ', a tensile strength of 65-85MPa, a tensile modulus of 3.0-3.6GPa, an elongation at break of 2.6-4.6%, a bending strength of 100-140MPa, and a bending modulus of 2.6-3.6GPa after being cured for 2-3 hours at 120 ° C.
Before and after curing, the toughening phase state remains unchanged, the dispersion state is uniform, and the toughening effect is good and stable.
The prepreg of the invention has good stability, and the gel time at 120 ° C is 9~20min. The preparation method adopts the hot melt method to manufacture the prepreg process. The fiber woven fabric is protected by the isolation paper and passes through the impregnation roller. The hot melt matrix resin is impregnated with the fiber woven fabric under the self weight and pressure of the impregnation roller, and the resin content is controlled to form a single-layer prepreg blank through automatic winding. The production process is simple.
Process for preparing epoxy resin prepreg
The prepreg prepared by the present invention is superimposed to obtain at least three layers of prepreg blank, which are cured for 2-3 hours at 120 ° C using a hot pressing tank process to obtain a composite laminate. The number of layers of prepreg blank depends on the specific situation. 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 layer shear strength is 72~82MPa, and the mechanical properties are good.
The present invention has the following advantages:
1. The present invention uses core-shell polymers to replace traditional rubber and thermoplastic resins (TP) to toughen epoxy matrix resins. The results showed that after blending the pre designed core-shell polymer particles with the modified resin, their composition, morphology, size, and distribution in the resin remained unchanged before and after curing, that is, independent of the curing process. By toughening epoxy resin with core-shell polymer, the toughness, tensile strength, and bending strength of the epoxy matrix resin and composite laminates obtained were significantly improved, while Tg and modulus did not significantly decrease.
2. The prepreg of the present invention adopts a one-step hot melt process, which has the advantages of low volatile content, environmental protection, and no environmental pollution compared to the solvent method; Compared to the hot melt adhesive film transfer method, which first compresses the matrix resin into a film shape and then composite impregnates it with fiber woven fabric, its work efficiency is higher and the manufacturing cost is lower.
3. The prepreg prepared by the present invention has stability characteristics, and can be stored for 3 months under normal conditions (25 ° C), and for 6 months below -18 ° C.
4. The device for preparing prepreg of the present invention completes the impregnation process of epoxy matrix resin and fiber woven fabric in one step. Compared with the existing hot melt prepreg production device, the equipment has lower manufacturing cost, simpler production process, higher production efficiency, and more accurate control of prepreg resin content.
Embodiment
The technical solution of the present invention is not limited to the specific implementation methods listed below, but also includes any combination of various specific implementation methods.
Specific implementation method 1: The epoxy matrix resin of this implementation method is made of 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 curing agent 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, respectively 10 and 8, or 6 and 9; The curing accelerator is an organic urea or its derivative.
The particle size of the core-shell polymer described in this embodiment is 100-300nm. The core-shell polymer can be commercially available or prepared using existing publicly available preparation methods.
Silibase Silicone is focused on producing and selling all kinds of SILICONE-BASED new materials.Our main products are Artificial resin, artificial resin, resin adhesive,Epoxy Matrix, Epoxy Composites, Epoxy Matrix Resin, epoxy resin fibreglass resin.
