| 摘要 |
The present invention relates to an excellent sliding member coating composition causing no fusion even in the case of using CO_2 gas as a coolant by improving not only abrasion resistance, a fusion preventing ability, lubricity, and heat resistance, but also an adhesive force to a base material and flexibility by adjusting a mixing rate of a solid lubricant, various kinds of solvents, and other additives mixed with a thermo-hardening resin or a thermoplastic resin, which is a binder. The liquid paint of which viscosity is 32-36 cP is composed of 20-40 wt% of solid powders and 60-80 wt% of a solvent. The liquid paint composition with each component containing solid powders and solvents comprises 10-30 wt% of PAI, 5-15 wt% of a solid lubricant (PTFE), 5 wt% or less of a metallic oxide (example: Al_2O_3), 5 wt% or less of carbon black, 5 wt% or less of a silane coupling agent, 20-40 wt% of N-methyl-2-pyrrolidone (NMP), which is a solvent, 5-20 wt% of xylene and methoxypropyl acetate (DMAC), and 10-30 wt% of methyl ethyl ketone (MEK) with respect to the weight ratio of the entire composition. A mixing rate of NMP, xylene, DMAC, and MEK is 40-50 wt%, 10-15 wt%, 2-7 wt%, and 25-40 wt%, respectively. The present invention is characterized by using PTFE with a grain size of 0.2-1.0 μm and alumina and carbon black which are metallic oxides with an average grain size of about 2 μm or less. |
