Epoxy resin composition for carbon-fiber-reinforced composite material, prepreg, integrated molding, sheet of fiber-reinforced composite material and cabinet for electrical/electronic equipment
A technology for reinforcing composite materials and composite material boards, which is applied in the direction of fibrous fillers and layered products, can solve the problems of unsatisfactory mechanical properties and light weight, unsatisfactory flame retardancy, and decline in mechanical properties, and achieve excellent and difficult Combustibility and mechanical properties, excellent mechanical properties and light weight, beneficial to thin and light weight
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Embodiment 1
[0242] The raw materials shown in Table 1 were mixed in the order shown below with a mixer to obtain an epoxy resin composition in which polyvinyl formal was uniformly dissolved. The numerals of the resin compositions in Table 1 represent parts by weight (the same applies hereinafter).
[0243] (a) Stir each epoxy resin raw material and polyvinyl formal while heating to 150-190° C. for 1-3 hours, and dissolve the polyvinyl formal uniformly.
[0244] (b) Lower the temperature of the resin to 90-110° C., add the phosphorus compound, and stir for 20-40 minutes.
[0245] (c) Lower the resin temperature to 55-65°C, add dicyandiamide and 3-(3,4-dichlorophenyl)-1,1-dimethylurea, and knead at this temperature for 30-40 minutes After that, it was taken out from the mixer to obtain a resin composition.
[0246] The resin viscosity of this resin composition at 60° C. was measured by the above-mentioned method and found to be 145 Pa·s. As a result of evaluation of moldability, it was cu...
Embodiment 2～5
[0251] The amount of the red phosphorus flame retardant "NOVARED" 120 was changed from 3 parts by weight to 6 parts by weight, 10 parts by weight, 15 parts by weight, and 2 parts by weight, and the epoxy resin combination was prepared in the same manner as in Example 1 things. When the properties of the obtained epoxy resin composition were evaluated, there was almost no difference in the viscosity of the resin composition and the specific gravity of the cured resin. In addition, all the curability of the resin composition was the same level as that of Example 1. The adhesiveness of the prepreg was adequate except for the addition of 15 parts by weight, and the addition of 15 parts by weight was slightly insufficient in adhesiveness, but it was at a level that did not affect the use.
[0252] The prepreg and the fiber-reinforced composite material board are manufactured according to the above method. The flame retardancy of the obtained fiber-reinforced composite material pl...
Embodiment 6～7
[0258] A resin composition, a prepreg, and a fiber-reinforced composite material were produced in the same manner as in Example 1 except that OMICURE24 was used instead of DCMU as a curing accelerator. Evaluation of various properties was carried out according to the above-mentioned method, and the obtained resin composition could be cured at 150°C for 3 minutes, and the mechanical properties of the composite material were as good as those of Examples 1-4. Regarding the flame retardancy, not only the test pieces with a laminate thickness of about 0.6 mm but also the test pieces with a laminate thickness of about 0.4 mm and about 0.2 mm reached V-0.
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Abstract
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