Disclosed is a method for producing
carbon fibers which exhibit excellent adhesion to a matrix resin and have excellent processability. Specifically disclosed is a method for producing a
sizing agent-coated
carbon fibers, wherein at least one kind of
sizing agent that is selected from the group consisting of
sizing agents (a), (b) and (c) described below is used for
coating, in each of said sizing agents a bi- or higher functional
epoxy compound (A1) and / or an
epoxy compound (A2) being used as a component (A), and said
epoxy compound (A2) having a mono- or higher functional epoxy group and at least one functional group that is selected from among a hydroxyl group, an
amide group, an
imide group, a urethane group, a
urea group, a
sulfonyl group and a sulfo group. The method for producing a sizing agent-coated
carbon fibers is characterized in that the sizing agent is applied to carbon fibers and the resulting is subjected to a heat treatment within the temperature range of 160-260° C. for 30-600 seconds. (a) A sizing agent which is obtained by blending at least 0.1-25 parts by
mass of a
tertiary amine compound and / or
tertiary amine salt (B1) having a molecular weight of 100 g / mol or more per 100 parts by
mass of the component (A), said
tertiary amine compound and / or
tertiary amine salt (B1) being used as a component (B). (b) A sizing agent which is obtained by blending at least 0.1-25 parts by
mass of a
quaternary ammonium salt (B2) having a cationic
moiety represented by general formula (I) or (II) per 100 parts by mass of the component (A), said
quaternary ammonium salt (B2) being used as a component (B). (In the formulae, R1-R5 each represents a
hydrocarbon group having 1-22 carbon atoms, a group that contains a
hydrocarbon having 1-22 carbon atoms and an
ether structure, a group that contains a
hydrocarbon having 1-22 carbon atoms and an ester structure, or a group that contains a hydrocarbon having 1-22 carbon atoms and a hydroxyl group; and R6 and R7 each represents a
hydrogen atom, a hydrocarbon group having 1-8 carbon atoms, a group that contains a hydrocarbon having 1-8 carbon atoms and an
ether structure, or a group that contains a hydrocarbon having 1-8 carbon atoms and an ester structure.) (c) A sizing agent which is obtained by blending at least 0.1-25 parts by mass of a
quaternary phosphonium salt and / or
phosphine compound (B3) per 100 parts by mass of the component (A), said quaternary
phosphonium salt and / or
phosphine compound (B3) being used as a component (B).