US11505641B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11505641-B2 |
| Application number | US-201916980988-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 27, 2019 |
| Priority date | Mar 20, 2018 |
| Publication date | Nov 22, 2022 |
| Grant date | Nov 22, 2022 |
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A prepreg having excellent tackiness as well as excellent resin strength after curing and strength in the non-fiber direction is described; and a fiber-reinforced composite material using the prepreg, where the prepreg is composed of reinforcing fibers and a resin composition which includes [A] an epoxy resin, [B] a dicyanamide and [C] a compound having a melting point of 130° C. or lower and a solubility parameter whose difference from the solubility parameter of [B] is 8 or less.
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The invention claimed is: 1. A prepreg composed of reinforcing fibers and a resin composition, wherein the resin composition comprises the following [A] to [C]: [A]: an epoxy resin; [B]: a dicyandiamide; and [C]: a compound which has a melting point of 130° C. or lower and a boiling point of 173° C. or higher, and a solubility parameter whose difference from the solubility parameter of [B] is 8 or less, and which is selected from ethers, amides, sulfoxides and imides; wherein the resin composition comprises from 1 to 10 parts by mass of [C] with respect to 100 parts by mass of [A], wherein the resin composition comprises from 30 to 250 parts by mass of [C] with respect to 100 parts by mass of [B], and wherein the resin composition has a viscosity at 25° C. of 1,000 Pa·s or more. 2. The prepreg according to claim 1 , wherein the component [A] has an average epoxy equivalent of from 115 to 200 g/eq. 3. The prepreg according to claim 1 , wherein 100 parts by mass of the component [A] comprises from 40 to 90 parts by mass of an epoxy resin having three or more functional groups and containing a nitrogen atom within the molecule. 4. A fiber-reinforced composite material obtained by curing the prepreg according to claim 1 . 5. The prepreg according to claim 1 , wherein the reinforcing fibers are carbon fibers.
Carboxylic acid amides · CPC title
Ethers; Acetals; Ketals; Ortho-esters · CPC title
containing acyclic nitrogen atoms · CPC title
containing two or more polymers of the same C08L -group · CPC title
Reinforcing macromolecular compounds with loose or coherent fibrous material · CPC title
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