Prepreg, fiber-reinforced composite material, and resin composition containing particles

1. A prepreg comprising:

a reinforcing fiber layer including carbon fibers and a resin composition with which the space between fibers of the carbon fibers is impregnated and which contains (A) a benzoxazine resin, (B) an epoxy resin, and (C) a curing agent having 2 or more phenolic hydroxy groups in a molecule; and

a surface layer provided on at least one surface of the reinforcing fiber layer and containing

(A) a benzoxazine resin,

(B) an epoxy resin,

(C) a curing agent having 2 or more phenolic hydroxy groups in a molecule, and

(D) a plurality of polyamide resin particles,

wherein the polyamide resin particles include polyamide 1010 resin particles,

wherein, when the total amount of the (A) component and the (B) component is 100 parts by mass:

the resin composition contains

65 to 80 parts by mass of the benzoxazine resin including bisphenol F-aniline-based benzoxazine resin and phenol-aniline-based benzoxazine resin;

20 to 35 parts by mass of (3′,4′-epoxycyclohexane)methyl-3,4-epoxycyclohexanecarboxylate as the (B) component; and

7 to 15 parts by mass of 9,9-bis(4-hydroxyphenyl)fluorene, 1,1-bis(4-hydroxyphenyl)cyclohexane, or bis(4-hydroxyphenyl) sulfide as the (C) component; and

the surface layer contains:

65 to 80 parts by mass of the benzoxazine resin including bisphenol F-aniline-based benzoxazine resin and phenol-aniline-based benzoxazine resin as the (A) component;

20 to 35 parts by mass of (3′,4′-epoxycyclohexane)methyl-3,4-epoxycyclohexanecarboxylate as the (B) component;

7 to 15 parts by mass of

9,9-bis(4-hydroxyphenyl)fluorene,

1,1-bis(4-hydroxyphenyl)cyclohexane, or

bis(4-hydroxyphenyl) sulfide

as the (C) component; and

15 to 45 parts by mass of the polyamide 1010 resin particles having an average particle size of 5 to 30 μm as the (D) component.

2. A fiber-reinforced composite material obtained by stacking the prepreg according to claim 1 plurally and performing heating under increased pressure.

3. A resin composition containing particles comprising:

(A) a benzoxazine resin;

(B) an epoxy resin;

(C) a curing agent having 2 or more phenolic hydroxy groups in a molecule; and

(D) a plurality of polyamide resin particles,

wherein the polyamide resin particles include a polyamide 1010 resin particle polyamide 1010 resin particles,

wherein, when the total amount of the (A) component and the (B) component is 100 parts by mass, the resin composition contains

65 to 80 parts by mass of the benzoxazine resin including bisphenol F-aniline-based benzoxazine resin and phenol-aniline-based benzoxazine resin;

20 to 35 parts by mass of (3′,4′-epoxycyclohexane)methyl-3,4-epoxycyclohexanecarboxylate as the (B) component as the (B) component; and

7 to 15 parts by mass of

9,9-bis(4-hydroxyphenyl)fluorene,

1,1-bis(4-hydroxyphenyl)cyclohexane, or

bis(4-hydroxyphenyl) sulfide

as the (C) component and

15 to 45 parts by mass of the polyamide 1010 resin particles having an average particle size of 5 to 30 μm as the (D) component.

4. The resin composition according to claim 3 , wherein the resin composition contains (E) a toughness improver.

5. The prepreg according to claim 1 , wherein the reinforcing fiber layer contains polyacrylonitrile-based carbon fibers having 200 to 550 GPa of tensile elastic modulus in a strand tensile test.

6. The prepreg according to claim 5 , wherein the resin composition contains (E) a toughness improver, and the surface layer contains (E) a toughness improver.

7. The prepreg according to claim 1 , wherein the resin composition contains (E) a toughness improver, and the surface layer contains (E) a toughness improver.