JP2002053883A5 - - Google Patents

Description

[0011]
Furthermore, the larger the elongation percentage, the larger the range of deformation without breakage, and the larger the elongation percentage of the polyamideimide resin as the binder, the more the lubricant film can be deformed without breakage, and Contact stress can be dispersed and reduced by deformation. This makes it possible to reduce the coefficient of friction and to have excellent friction characteristics. In addition, if the elongation rate is high, it can extend without breaking, so it can have excellent wear resistance. In this case, when the elongation of the polyamideimide resin is less than 10%, the contact stress is dispersed, and the effect of reducing the friction coefficient becomes insufficient. On the contrary, when the elongation rate exceeds 20%, the deformation of the lubricating film becomes large, and the adhesion between the lubricating film and the sliding member becomes insufficient.

[0017]
The solid lubricant can be selected from known ones and used appropriately.
By forming a lubricating film on the surface of a sliding member by dispersing a solid lubricant in a polyamide-imide resin as a binder, the coefficient of friction can be reduced, and conformability can be ensured. In addition, sulfides such as molybdenum disulfide (MoS ₂ ) and tungsten disulfide (WS ₂ ), polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene-hexafluoroflopylene copolyester It is preferable to select from polymers, tetrafluoroethylene-ethylene copolymers, fluorine compounds such as polyvinylidene fluoride and polychlorotrifluoroethylene , graphite (graphite), fluorinated graphite and the like, and sulfides, fluorine compounds, graphite It is preferable to select and use one, two or three of them from the viewpoint of improving the friction characteristics and the seizure resistance. Although detailed data are not particularly described, it is confirmed that sulfide, fluorine compound and graphite show similar effects.

Claims (13)

A composition for a sliding member, comprising a polyamideimide resin and a solid lubricant and an antiwear agent dispersed in the polyamideimide resin,
The composition for a sliding member, wherein the polyamideimide resin has a tensile strength of 78.4 to 98 MPa, a longitudinal elastic modulus of 1960 to 2940 MPa, and an elongation rate of 10 to 20%. The composition for a sliding member according to claim 1, wherein the solid lubricant is 1 to 500 parts by weight with respect to 100 parts by weight of the polyamideimide resin. The composition for a sliding member according to claim 1 or 2, wherein the solid lubricant is one, two or three of a sulfide, a fluorine compound and a graphite. The solid lubricant is 0 to 2000 parts by weight of the sulfide, 0 to 2000 parts by weight of the fluorine compound, and 0 to 2000 parts by weight of the graphite based on 100 parts by weight of the antiwear agent. The composition for a sliding member according to claim 3, wherein the weight ratio of the solid lubricant to the antiwear agent is 1/100 to 6000/100. The composition for a sliding member according to claim 3 or 4, wherein the sulfide is one or two of molybdenum disulfide and tungsten disulfide. The fluorine compounds include polytetrafluoroethylene, tetrafluoroethylene - perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene - hexafluoropropylene furo propylene copolymer, tetrafluoroethylene - ethylene copolymer, polyvinylidene fluoride and Po Li The composition for a sliding member according to claim 3, 4 or 5, wherein the composition is one or more of chlorotrifluoroethylene. The composition for a sliding member according to claim 1, wherein the solid lubricant has an average particle diameter of 0.5 to 15 μm. The composition for a sliding member according to claim 1, 2, 3, 4, 5, 6, or 7, wherein the antiwear agent is 1 to 500 parts by weight with respect to 100 parts by weight of the polyamideimide resin. The composition for a sliding member according to claim 8, wherein the antiwear agent is one or more of a particulate antiwear agent and a fibrous antiwear agent. The composition for a sliding member according to claim 9, wherein the particulate antiwear agent is one or more of silicon nitride, alumina, silicon carbide, boron nitride, diamond, silica glass and silica. The composition for a sliding member according to claim 9 or 10, wherein the particulate antiwear agent has a particle size of 0.1 to 10 μm. The composition for a sliding member according to claim 9, 10 or 11, wherein the fibrous antiwear agent is one or two of carbon fibers and potassium titanate fibers. The composition for a sliding member according to claim 9, 10, 11, or 12, wherein the fibrous antiwear agent has a fiber diameter of 0.1 to 10 m and a fiber length of 5 to 100 m.