JP2008280485A - Resin composition for coating sliding part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To impart, to the sliding part of a compressor, an engine and the like, sliding characteristics, abrasion resistance, seizure resistance and the like superior to those conventionally obtained. <P>SOLUTION: The resin composition for coating the sliding part contains a polyamideimide resin and polytetrafluoroethylene powders. The polyamideimide resin occupies 50-80 wt.% in the total weight. This polyamideimide resin has a tensile strength of ≥40 MPa under the temperature condition of 100°C. The polytetrafluoroethylene powders occupy ≥15 wt.% in the total weight. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a sliding part coating resin composition, and more particularly to a sliding part coating resin composition applied to sliding parts such as a compressor and an engine.

In the past, solid lubricants (for example, polytetrafluoroethylene etc.) have been included in order to provide excellent sliding characteristics, wear resistance, seizure resistance, etc. to sliding parts such as compressors and engines. The technique of “coating the sliding portion with a polyamideimide (hereinafter abbreviated as“ PAI ”) resin” has been proposed (see, for example, Patent Documents 1 to 3).
JP 2004-263727 A JP 2002-53883 A JP 2005-30376 A

  By the way, in such a coating agent, when the addition amount of the solid lubricant is smaller than the addition amount of the PAI resin, the PAI resin itself is not required to have a very high strength. This is because the PAI resin has a polar group such as an amide group in the skeleton, and adheres firmly to an iron-based substrate by hydrogen bonding or the like.

  However, when the amount of solid lubricant added is increased relative to the amount of PAI resin in an attempt to achieve low friction, the adhesion depends largely on the physical anchor effect rather than the chemical structure of the PAI resin. To come. For this reason, when a large stress is applied to the coating film, the coating film tends to cause cohesive failure rather than interfacial failure.

  An object of the present invention is to impart sliding characteristics, wear resistance, seizure resistance, and the like superior to those of conventional sliding parts such as compressors and engines, and to make it difficult to peel off the coating film.

  The sliding part coating resin composition according to the first invention contains a polyamideimide resin and a polytetrafluoroethylene powder. Polyamideimide resin occupies 50-80 wt% with respect to the total weight. Moreover, this polyamideimide resin has a tensile strength of 40 MPa or more under a temperature condition of 100 degrees Celsius. The polytetrafluoroethylene powder accounts for 15 wt% or more with respect to the total weight.

  As a result of intensive studies by the inventor of the present application, among polyamidoimide resins, polytetrafluoroethylene powder is added by adding 50 to 80 wt% of polyamidoimide resin having a tensile strength of 40 MPa or more particularly at a temperature of 100 degrees Celsius. By coating the sliding member with the sliding portion coating resin composition to which 15 wt% or more of the total weight is added, the sliding portion such as a compressor or engine has superior sliding characteristics and resistance. It was found that it was possible to impart wear resistance and seizure resistance and that the coating film was difficult to peel off (considering that cohesive failure was less likely to occur). For this reason, this sliding part coating resin composition can impart sliding characteristics, abrasion resistance, seizure resistance, and the like superior to conventional ones to sliding parts such as compressors and engines. Moreover, if this sliding part coating | coated resin composition is used, it can be made difficult to peel a coating film.

  The sliding portion coating resin composition according to the second invention is the sliding portion coating resin composition according to the first invention, and the polyamideimide resin has a tensile strength of 30 MPa or more at a temperature of 200 degrees Celsius. It is.

  As a result of intensive studies by the inventor of the present application, the polyamideimide resin in the sliding portion coating resin composition has a tensile strength of 40 MPa or more at a temperature of 100 degrees Celsius and a tensile strength of 200 degrees Celsius. If a polyamide-imide resin having a pressure of 30 MPa or more is used, it is possible to impart sliding characteristics, wear resistance, and seizure resistance that are superior to conventional sliding parts such as compressors and engines, as well as a coating film. It turned out that it became difficult to peel. For this reason, this sliding part coating resin composition can impart sliding characteristics, abrasion resistance, seizure resistance, and the like superior to conventional ones to sliding parts such as compressors and engines. Moreover, if this sliding part coating | coated resin composition is used, it can make it difficult to peel a coating film further.

  The sliding part coating resin composition according to the third aspect of the invention contains a polyamideimide resin and a polytetrafluoroethylene powder. Polyamideimide resin occupies 50-80 wt% with respect to the total weight. Further, this polyamideimide resin has a tensile strength of 110 MPa or more and 180 MPa or less under a temperature condition of 25 degrees Celsius. The polytetrafluoroethylene powder accounts for 15 wt% or more with respect to the total weight.

  As a result of intensive studies by the inventors of the present invention, among polyamidoimide resins, a polyamidoimide resin having a tensile strength of 110 MPa or more and 180 MPa or less in particular at a temperature of 25 degrees Celsius is added by 50 to 80 wt% with respect to the total weight. By coating the sliding member with a sliding part coating resin composition to which ethylene powder is added in an amount of 15 wt% or more based on the total weight, sliding characteristics such as compressors and engines can be improved. Thus, it was found that the coating film can be provided with wear resistance and seizure resistance, and that the coating film is difficult to peel off (considering that the cohesive failure is less likely to occur). For this reason, this sliding part coating resin composition can impart sliding characteristics, abrasion resistance, seizure resistance, and the like superior to conventional ones to sliding parts such as compressors and engines. Moreover, if this sliding part coating | coated resin composition is used, it can be made difficult to peel a coating film.

  The sliding part coating resin composition according to the fourth aspect of the invention contains a polyamideimide resin and a polytetrafluoroethylene powder. Polyamideimide resin occupies 50-80 wt% with respect to the total weight. The polyamideimide resin has an elongation of 40% or more and 150% or less under a temperature condition of 25 degrees Celsius. The polytetrafluoroethylene powder accounts for 15 wt% or more with respect to the total weight.

  As a result of intensive studies by the inventors of the present invention, among polyamidoimide resins, a polyamidoimide resin having an elongation of 40% to 150% in particular at a temperature of 25 degrees Celsius is added to 50 to 80 wt% of the total weight. Sliding parts coated with a sliding part coating resin composition with fluoroethylene powder added at 15% by weight or more based on the total weight, resulting in superior sliding characteristics on sliding parts such as compressors and engines. In addition, it has been found that the coating film can be provided with wear resistance and seizure resistance and that the coating film is difficult to peel off (it is considered that the cohesive failure is less likely to occur). For this reason, this sliding part coating resin composition can impart sliding characteristics, abrasion resistance, seizure resistance, and the like superior to conventional ones to sliding parts such as compressors and engines. Moreover, if this sliding part coating | coated resin composition is used, it can be made difficult to peel a coating film.

  The sliding part coating resin composition according to the fifth aspect of the present invention is the sliding part coating resin composition according to any of the first to fourth aspects of the present invention, and further contains fluoride and aluminum oxide powder.

  For this reason, this sliding part coating resin composition can improve the wear resistance of the sliding member.

The resin composition for covering a sliding part according to the sixth invention is the resin composition for covering a sliding part according to the fifth invention, wherein the fluorides are calcium fluoride (CaF ₂ ) and strontium fluoride (SrF _2). At least one fluoride selected from the group consisting of:

  For this reason, this resin composition for coating | coated sliding part can improve the abrasion resistance of a sliding member, maintaining manufacturing cost low.

  The resin composition for coating a sliding part according to the first invention can impart sliding properties, abrasion resistance, seizure resistance, etc. superior to conventional ones to sliding parts such as compressors and engines. . Moreover, if this sliding part coating | coated resin composition is used, it can be made difficult to peel a coating film.

  The resin composition for covering a sliding part according to the second invention can impart sliding characteristics, abrasion resistance, seizure resistance, etc. superior to conventional ones to sliding parts such as compressors and engines. . Moreover, if this sliding part coating | coated resin composition is used, it can make it difficult to peel a coating film further.

  The resin composition for coating a sliding part according to the third invention can impart sliding characteristics, wear resistance, seizure resistance, etc. superior to conventional ones to sliding parts such as compressors and engines. . Moreover, if this sliding part coating | coated resin composition is used, it can make it difficult to peel a coating film further.

  The resin composition for covering a sliding part according to the fourth invention can impart sliding characteristics, wear resistance, seizure resistance, etc. superior to conventional ones to sliding parts such as compressors and engines. . Moreover, if this sliding part coating | coated resin composition is used, it can make it difficult to peel a coating film further.

  The resin composition for covering a sliding part according to the fifth invention can improve the wear resistance of the sliding member.

  The sliding portion coating resin composition according to the sixth aspect of the invention can improve the wear resistance of the sliding member while keeping the manufacturing cost low.

  As shown in FIG. 1, an oscillating rotary compressor 101 according to an embodiment of the present invention is a 2-cylinder oscillating rotary compressor, mainly a cylindrical sealed dome-type casing. 110, an oscillating rotary compression mechanism 115, a drive motor 116, a suction pipe 119, a discharge pipe 120, and a muffler 160. In this oscillating rotary compressor 101, an accumulator (gas-liquid separator) 210 is attached to a casing 110. Hereinafter, the components of the oscillating rotary compressor 101 will be described in detail.

<Details of swinging rotary compressor components>
(1) Casing As shown in FIG. 1, the casing 110 includes a substantially cylindrical trunk casing 111, a bowl-shaped upper wall 112 that is airtightly welded to the upper end of the trunk casing 111, and It is comprised from the bowl-shaped bottom wall part 113 welded to the lower end part of the trunk | drum casing part 111 airtightly. The casing 110 mainly accommodates a swinging rotary compression mechanism 115 that compresses a gas refrigerant, and a drive motor 116 disposed above the swinging rotary compression mechanism 115. The oscillating rotary compression mechanism 115 and the drive motor 116 are connected to each other by a crankshaft 117 arranged so as to extend in the vertical direction in the casing 110.

(2) Oscillating rotary compression mechanism As shown in FIGS. 1 and 3, the oscillating rotary compression mechanism 115 mainly includes a crankshaft 117, a piston 121, a bush 122, a front head 123, and a first cylinder block. 124, a middle plate 125, a second cylinder block 126, and a rear head 127. In the present embodiment, the front head 123, the first cylinder block 124, the middle plate 125, the second cylinder block 126, and the rear head 127 are integrally fastened by a plurality of bolts 190. In this embodiment, the oscillating rotary compression mechanism 115 is immersed in the lubricating oil L stored at the bottom of the casing 110, and the oscillating rotary compression mechanism 115 is different from the lubricating oil L. It is designed to be pressurized. Hereinafter, the components of the oscillating rotary compression mechanism 115 will be described in detail.

a) First Cylinder Block As shown in FIG. 2, the first cylinder block 124 is formed with a cylinder hole 124a, a suction hole 124b, a discharge passage 124c, a bush accommodation hole 124d, and a blade accommodation hole 124e. As shown in FIGS. 1 and 2, the cylinder hole 124 a is a cylindrical hole that penetrates along the thickness direction. The suction hole 124b penetrates from the outer peripheral wall surface to the cylinder hole 124a. The discharge passage 124c is formed by cutting out a part of the inner peripheral side of the cylindrical portion that forms the cylinder hole 124a. The bush housing hole 124d is a hole that penetrates along the plate thickness direction, and is disposed between the suction hole 124b and the discharge passage 124c when viewed along the plate thickness direction. The blade accommodation hole 124e is a hole that penetrates along the plate thickness direction and communicates with the bush accommodation hole 124d.

  In the first cylinder block 124, the eccentric shaft portion 117a of the crankshaft 117 and the roller portion 121a of the piston 121 are accommodated in the cylinder hole 124a, and the blade portion 121b and the bush 122 of the piston 121 are accommodated in the bush accommodation hole 124d. When the blade portion 121b of the piston 121 is accommodated in the blade accommodation hole 124e, the discharge passage 124c is fitted to the front head 123 and the middle plate 125 so as to face the front head 123 side (see FIG. 3). As a result, a first cylinder chamber Rc1 is formed in the oscillating rotary compression mechanism 115. The first cylinder chamber Rc1 includes a suction chamber that communicates with the suction hole 124b by the piston 121, and a discharge chamber that communicates with the discharge passage 124c. It will be divided into.

b) Second cylinder block As shown in FIG. 2, the second cylinder block 126 includes a cylinder hole 126a, a suction hole 126b, a discharge passage 126c, a bush accommodation hole 126d, and a blade accommodation hole, as shown in FIG. 126e is formed. As shown in FIGS. 1 and 2, the cylinder hole 126a is a cylindrical hole that penetrates along the thickness direction. The suction hole 126b penetrates from the outer peripheral wall surface to the cylinder hole 126a. The discharge passage 126c is formed by cutting out a part of the inner peripheral side of the cylindrical portion that forms the cylinder hole 126a. The bush accommodation hole 126d is a hole that penetrates along the plate thickness direction, and is disposed between the suction hole 126b and the discharge passage 126c when viewed along the plate thickness direction. The blade accommodation hole 126e is a hole that penetrates along the plate thickness direction and communicates with the bush accommodation hole 126d.

  In the second cylinder block 126, the eccentric shaft portion 117b of the crankshaft 117 and the roller portion 121a of the piston 121 are accommodated in the cylinder hole 126a, and the blade portion 121b and the bush 122 of the piston 121 are accommodated in the bush accommodation hole 126d. In the state where the blade portion 121b of the piston 121 is accommodated in the blade accommodation hole 126e, the discharge path 126c is fitted to the rear head 127 and the middle plate 125 so as to face the rear head 127 (see FIG. 3). As a result, a second cylinder chamber Rc2 is formed in the oscillating rotary compression mechanism 115. The second cylinder chamber Rc2 includes a suction chamber that communicates with the suction hole 126b by the piston 121, and a discharge chamber that communicates with the discharge passage 126c. It will be divided into.

c) Crankshaft The crankshaft 117 is provided with two eccentric shaft portions 117a and 117b at one end. The two eccentric shaft portions 117a and 117b are formed such that their eccentric shafts face each other across the central axis of the crankshaft 117. Further, the crankshaft 117 is fixed to the rotor 152 of the drive motor 116 on the side where the eccentric shaft portions 117a and 117b are not provided.

d) Piston The piston 121 has a substantially cylindrical roller part 121a and a blade part 121b protruding outward in the radial direction of the roller part 121a. The roller portion 121a is inserted into the cylinder holes 124a and 126a of the cylinder blocks 124 and 126 while being fitted to the eccentric shaft portions 117a and 117b of the crankshaft 117. Thereby, when the crankshaft 117 rotates, the roller part 121a performs the revolving motion centering on the rotating shaft of the crankshaft 117. FIG. The blade portion 121b is housed in the bush housing holes 124d and 126d and the blade housing holes 124e and 126e. As a result, the blade portion 121b swings and moves forward and backward along the longitudinal direction.

  The piston 121 is manufactured from a porous sintered metal material. The piston 121 is coated with the sliding portion coating resin composition according to the present invention. This sliding part coating resin composition is composed of polyamideimide (hereinafter abbreviated as “PAI”) resin, polytetrafluoroethylene (hereinafter abbreviated as “PTFE”) powder, fluoride (for example, calcium fluoride and fluoride). Strontium etc.) and aluminum oxide powder. Here, the PAI resin has a tensile strength of 110 MPa or more and 180 MPa or less under a temperature condition of 25 degrees Celsius, a tensile strength of 40 MPa or more under a temperature condition of 100 degrees Celsius, or a temperature of 25 degrees Celsius. Under the conditions, the elongation is 40% or more and 150% or less. When the PAI resin has a tensile strength of 40 MPa or more under a temperature condition of 100 degrees Celsius, the PAI resin preferably has a tensile strength of 30 MPa or more under a temperature condition of 200 degrees Celsius. Further, the PAI resin accounts for 50 to 80 wt% with respect to the total weight, and the PTFE powder accounts for 15 wt% or more with respect to the total weight.

e) Bush The bush 122 is a substantially semi-cylindrical member, and is accommodated in the bush accommodation holes 124d and 126d so as to sandwich the blade portion 121b of the piston 121.

  The bush 122 is manufactured from a porous sintered metal material. The bush 122 is coated with the sliding portion coating resin composition according to the present invention. This sliding part coating resin composition is the same as the sliding part coating resin composition described in the section d).

f) Front Head The front head 123 is a member that covers the discharge path 124c side of the first cylinder block 124, and is fitted to the casing 110. A bearing portion 123a is formed on the front head 123, and a crankshaft 117 is inserted into the bearing portion 123a. Further, the front head 123 is formed with an opening 123 b for guiding the refrigerant gas flowing through the discharge passage 124 c formed in the first cylinder block 124 to the discharge pipe 120. The opening 123b is closed or opened by a discharge valve (not shown) for preventing the backflow of the refrigerant gas.

  The front head 123 is manufactured from a porous sintered metal material. The bearing portion 123a of the front head 123 is coated with the sliding portion coating resin composition according to the present invention. This sliding part coating resin composition is the same as the sliding part coating resin composition described in the section d).

g) Rear Head The rear head 127 covers the discharge path 126c side of the second cylinder block 126. A bearing portion 127a is formed in the rear head 127, and a crankshaft 117 is inserted into the bearing portion 127a. The rear head 127 has an opening (not shown) for guiding the refrigerant gas flowing through the discharge passage 126 c formed in the second cylinder block 126 to the discharge pipe 120. And this opening is obstruct | occluded or open | released by the discharge valve (not shown) for preventing the reverse flow of refrigerant gas.

  The rear head 127 is manufactured from a porous sintered material. The bearing portion 127a of the rear head 127 is coated with the sliding portion coating resin composition according to the present invention. This sliding part coating resin composition is the same as the sliding part coating resin composition described in the section d).

h) Middle Plate The middle plate 125 is disposed between the first cylinder block 124 and the second cylinder block 126, and divides the first cylinder chamber Rc1 and the second cylinder chamber Rc2.

(3) Drive Motor The drive motor 116 is a DC motor in the present embodiment, and mainly includes an annular stator 151 fixed to the inner wall surface of the casing 110, and a slight gap (air gap) inside the stator 151. The rotor 152 is rotatably accommodated with a passage).

  In the stator 151, a copper wire is wound around a tooth portion (not shown), and a coil end 153 is formed above and below. Further, on the outer peripheral surface of the stator 151, core cut portions (not shown) are formed which are formed at a plurality of positions from the upper end surface to the lower end surface of the stator 151 and at predetermined intervals in the circumferential direction. .

  A crankshaft 117 is fixed to the rotor 152 along the rotation axis.

(4) Suction pipe The suction pipe 119 is provided so as to penetrate the casing 110, and one end thereof is fitted in the suction holes 124 b and 126 b formed in the first cylinder block 124 and the second cylinder block 126, The other end is fitted into the accumulator 210.

(5) Discharge Pipe The discharge pipe 120 is provided so as to penetrate the upper wall portion 112 of the casing 110.

(6) Muffler The muffler 160 is for muting the discharge sound of the refrigerant gas, and is attached to the front head 123.

<Operation of oscillating rotary compressor>
When the drive motor 116 is driven, the eccentric shaft portions 117a and 117b rotate eccentrically around the crankshaft 117, and the roller portion 121a fitted to the eccentric shaft portions 117a and 117b has the outer circumferential surface of the cylinder chamber Rc1, Revolves in contact with the inner peripheral surface of Rc2. As the roller portion 121a revolves in the cylinder chambers Rc1 and Rc2, the blade portion 121b moves forward and backward while being held by the bush 122 on both sides. Then, the low-pressure refrigerant gas is sucked into the suction chamber from the suction port 119 and compressed into the high pressure by the discharge chamber, and then the high-pressure refrigerant gas is discharged from the discharge passages 124c and 126c.

<Evaluation of coating film on piston, bush, front head and rear head>
Hereinafter, the coating film covering the piston, the bush, the front head, and the rear head will be evaluated in detail using examples.

-High temperature strength evaluation test of polyamideimide resin by limit PV method-
Here, the strength of the PAI resin at 100 degrees Celsius is evaluated. In this test, Hitachi Chemical Co., Ltd. trade name HI-600 (nonvolatile content (solid content): 25-30 wt%, solvent composition: N-methyl-2-pyrrolidone / xylene 80/20) was used as the PAI resin. A test piece was prepared by coating the PAI resin on a sintered substrate. As a result of this test, the PAI resin having a strength of 25 MPa at 100 degrees Celsius and the PAI resin having a strength of 30 MPa at 100 degrees Celsius were broken during the test and peeled off from the sintered base material. On the other hand, the PAI resin having a strength of 42 MPa at 100 degrees Celsius and the PAI resin having a strength of 45 MPa at 100 degrees Celsius remained adhered to the porous sintered metal substrate without breaking during the test.

  -Evaluation test of PAI resin by tensile test and limit surface pressure test-

(1) Tensile test After degreasing the glass substrate with acetone, the glass substrate was dried by nitrogen blowing. Next, a PAI resin solution HI-600 manufactured by Hitachi Chemical Co., Ltd. was applied to the glass substrate so that the film thickness after firing was around 15 μm (micrometer), and then the PAI resin solution was set to 80 degrees Celsius. The solution was left in an oven for 10 minutes to sufficiently remove the solvent in the PAI resin solution. Thereafter, the set temperature was changed to 280 degrees Celsius, and the PAI resin remaining on the glass substrate was sufficiently baked over 100 minutes. As a result, a PAI resin film was obtained. Finally, this film was cut into a strip shape having a width of 10 mm and a length of 60 mm to obtain a test piece for a tensile test.

  The tensile test specimen thus obtained was mounted on an autograph AFS-5 kG manufactured by Shimadzu Corporation, and the tensile fracture strength and tensile fracture elongation of the tensile specimen were measured in an air atmosphere of 100 degrees Celsius.

  As a result, the tensile fracture strength was 54 Mpa and the tensile fracture elongation was 8% (see Table 1).

(2) Limit surface pressure test 12 hours after putting PAI resin HI-600 manufactured by Hitachi Chemical Co., Ltd., PTFE powder manufactured by Daikin Industries, Ltd., calcium fluoride, and aluminum oxide powder into a ball mill. The materials were stirred and mixed. As a result, a sliding part coating resin composition solution having a viscosity of 10,000 to 20,000 cP was obtained. In addition, the mixed composition at this time was 60/20/15/5 by weight ratio in order. Incidentally, here, the weight of the PAI resin is not the weight of the varnish but the weight of the solid content.

  Next, a disk substrate (see FIG. 4) having an outer diameter of 44 mm and an inner diameter of 32 mm was degreased with acetone, and then the disk substrate was dried by nitrogen blowing. This disk base material is a porous sintered metal, and is specifically made from an EO material made by Hitachi Powder Metallurgy. Subsequently, the resin composition solution for coating the sliding portion is applied to the disc by a dispenser coating device (which may be a spray coating device or the like) so that the film thickness after firing falls within the range of 50 to 120 μm (micrometer). After applying to the substrate, the sliding part coating resin composition solution is left in an oven set at 50 degrees Celsius to 100 degrees Celsius for 30 minutes to remove the solvent in the sliding part coating resin composition. did. Thereafter, the set temperature was changed from 100 degrees Celsius to 280 degrees Celsius, and the sliding portion coating resin composition remaining on the disk substrate was sufficiently baked over 30 minutes. As a result, a film of the sliding portion coating resin composition was formed on the disk substrate. Thereafter, this film was polished so that the film thickness was in the range of 30 to 50 μm (micrometers) to obtain the final disc test piece 20. Then, the disc test piece 20 was set in a test apparatus with the film S side facing upward.

  Next, after fixing the blade 11 to the blade holder 10, the blade holder 10 is moved so that the tip of the blade 11 faces downward (that is, the tip of the blade 11 faces the film S on the disk test piece 20). Set in test equipment. The blade 11 is made of SKH51 quenching and tempering material (HV750 to 850), and has a circular tip at the tip as shown in FIG. More specifically, this blade 11 has a radius of the arcuate surface at the tip of 6 mm, a width of 4 mm, a depth of 5 mm, and a length of 11 mm. Note that the arc surface at the tip of the blade 11 increases the surface pressure against the disk test piece 20 by Hertz contact and reproduces a severe sliding state (a state in which a piece hits etc. occurs) in an actual compressor or the like. It is to do. The blade 11 is attached to three fixed positions that are evenly arranged on a circumference 19 mm away from the axis X when the blade holder 10 is viewed along the axis X (that is, the blade fixing position is Provided at an angle of 120 degrees on the circumference 19 mm away from the axis X). At this time, the blade 11 is attached to the blade holder 10 so that the arc sides are aligned along the radial direction of the blade holder (that is, the arrow direction shown in FIG. 5 is the sliding direction).

  Then, with the blade 11 pressed against the disk test piece 20 with a 30 kgf load, the disk test piece 20 was rotated about the axis X so that the sliding speed was 0.5 m / s. At this time, the disk test piece 20 was exposed to the atmosphere, and no lubricating oil was injected between the blade 11 and the disk test piece 20 (that is, the test was performed in a dry state). After that, the load was increased by 10 kgf every 5 minutes, and the load at which the friction coefficient between the blade 11 and the disk test piece 20 increased rapidly was defined as the limit load.

  In this example, the limit load was 70 kgf (see Table 1).

  A tensile test specimen was prepared in the same manner as in Example 1 except that the raw material for preparing the tensile test specimen was changed to PAI resin solution HPC-9100 manufactured by Hitachi Chemical Co., Ltd. Further, a tensile test was performed in the same manner as in Example 1 except that the measurement temperature condition was changed to 25 degrees Celsius. Moreover, the polyamideimide resin in the raw material for preparing the test piece for limit surface pressure test was changed to PAI resin solution HPC-9100 manufactured by Hitachi Chemical Co., Ltd., and the weight of the raw material for preparing the test piece for limit surface pressure test Except that the ratio was changed to 50/30/20/0, a test piece for limit surface pressure test was prepared in the same manner as in Example 1, and the limit surface pressure test was performed. At this time, the tensile fracture strength was 150 Mpa, the tensile fracture elongation was 9%, and the limit load was 65 kgf (see Table 1).

  A tensile test specimen was prepared in the same manner as in Example 1 except that the raw material for preparing the tensile test specimen was changed to PAI resin solution HPC-9100 manufactured by Hitachi Chemical Co., Ltd. Further, a tensile test was performed in the same manner as in Example 1 except that the measurement temperature condition was changed to 25 degrees Celsius. Further, the test for limit surface pressure test was carried out in the same manner as in Example 1 except that the polyamideimide resin in the raw material for preparing the test piece for limit surface pressure test was changed to PAI resin solution HPC-9100 manufactured by Hitachi Chemical Co., Ltd. A piece was prepared and subjected to a limit surface pressure test. At this time, the tensile fracture strength was 150 Mpa, the tensile fracture elongation was 9%, and the limit load was 80 kgf (see Table 1).

  A tensile test specimen was prepared in the same manner as in Example 1 except that the raw material for preparing the tensile test specimen was changed to PAI resin solution HPC-9100 manufactured by Hitachi Chemical Co., Ltd. Further, a tensile test was performed in the same manner as in Example 1 except that the measurement temperature condition was changed to 25 degrees Celsius. Moreover, the polyamideimide resin in the raw material for preparing the test piece for limit surface pressure test was changed to PAI resin solution HPC-9100 manufactured by Hitachi Chemical Co., Ltd., and the weight of the raw material for preparing the test piece for limit surface pressure test Except that the ratio was changed to 70/20/8/2, a test piece for limit surface pressure test was prepared in the same manner as in Example 1, and the limit surface pressure test was performed. At this time, the tensile fracture strength was 150 MPa, the tensile fracture elongation was 9%, and the limit load was 70 kgf (see Table 1).

  A tensile test specimen was prepared in the same manner as in Example 1 except that the raw material for preparing the tensile test specimen was changed to PAI resin solution HPC-9200 manufactured by Hitachi Chemical Co., Ltd. Further, a tensile test was performed in the same manner as in Example 1 except that the measurement temperature condition was changed to 25 degrees Celsius. Further, the test for limit surface pressure test was performed in the same manner as in Example 1 except that the polyamideimide resin in the raw material for preparing the test piece for limit surface pressure test was changed to PAI resin solution HPC-9200 manufactured by Hitachi Chemical Co., Ltd. A piece was prepared and subjected to a limit surface pressure test. At this time, the tensile fracture strength was 115 Mpa, the tensile fracture elongation was 11%, and the limit load was 60 kgf (see Table 1).

  A tensile test specimen was prepared in the same manner as in Example 1 except that the raw material for preparing the tensile test specimen was changed to Hitachi Chemical's PAI resin solution HPC-7200. Further, a tensile test was performed in the same manner as in Example 1 except that the measurement temperature condition was changed to 25 degrees Celsius. Further, the test for limit surface pressure test was performed in the same manner as in Example 1 except that the polyamide-imide resin in the raw material for preparing the test piece for limit surface pressure test was changed to PAI resin solution HPC-7200 manufactured by Hitachi Chemical Co., Ltd. A piece was prepared and subjected to a limit surface pressure test. At this time, the tensile fracture strength was 60 Mpa, the tensile fracture elongation was 130%, and the limit load was 60 kgf (see Table 1).

  A tensile test was performed in the same manner as in Example 1 except that the measurement temperature condition was changed to 200 degrees Celsius. Moreover, the test piece for limit surface pressure tests was produced similarly to Example 1, and the limit surface pressure test was done. At this time, the tensile fracture strength was 39 Mpa, the tensile fracture elongation was 7%, and the limit load was 70 kgf (see Table 1).

(Comparative Example 1)
A tensile test specimen was prepared and subjected to a tensile test in the same manner as in Example 1 except that the raw material for preparing the tensile test specimen was changed to PAI resin solution HPC4250 manufactured by Hitachi Chemical Co., Ltd. In addition, the test piece for limit surface pressure test was performed in the same manner as in Example 1 except that the polyamideimide resin in the raw material for preparing the test piece for limit surface pressure test was changed to PAI resin solution HPC4250 made by Hitachi Chemical Co., Ltd. It produced and the limit surface pressure test was done. At this time, the tensile fracture strength was 30 Mpa, the tensile fracture elongation was 10%, and the limit load was 30 kgf (see Table 1).

(Comparative Example 2)
A tensile test specimen was prepared in the same manner as in Example 1 except that the raw material for preparing the tensile test specimen was changed to PAI resin solution HPC4250 manufactured by Hitachi Chemical Co., Ltd. Further, a tensile test was performed in the same manner as in Example 1 except that the measurement temperature condition was changed to 25 degrees Celsius. In addition, the test piece for limit surface pressure test was performed in the same manner as in Example 1 except that the polyamideimide resin in the raw material for preparing the test piece for limit surface pressure test was changed to PAI resin solution HPC4250 made by Hitachi Chemical Co., Ltd. It produced and the limit surface pressure test was done. At this time, the tensile fracture strength was 80 Mpa, the tensile fracture elongation was 10%, and the limit load was 45 kgf (see Table 1).

-Discussion-
From the description of Example 1 and Comparative Example 1, when a PAI resin showing a higher tensile fracture strength under a temperature condition of 100 degrees Celsius is used as the PAI resin component in the resin composition for covering a sliding part, the sliding part is It can be seen that the sliding portion coating resin composition is less likely to break even at high temperatures. Accordingly, when such a PAI resin is used as the PAI resin component in the sliding portion coating resin composition, the sliding portion coating resin composition is imparted with high adhesion to the porous sintered metal substrate. Can do. In addition, the PAI resin used in Example 7 is the same PAI resin as the PAI resin used in Example 1. Therefore, it can be seen that this PAI resin shows not only a high tensile fracture strength under a temperature condition of 100 degrees Celsius but also a high tensile fracture strength under a temperature condition of 200 degrees Celsius.

  In addition, from the description of Examples 2 to 5 and Comparative Example 2, when a PAI resin showing higher tensile fracture strength under a temperature condition of 25 degrees Celsius is used as the PAI resin component in the sliding portion coating resin composition, It can be seen that the sliding portion coating resin composition is less likely to break even when the sliding portion becomes hot. Therefore, when such a PAI resin is used as the PAI resin component in the sliding part coating resin composition, high adhesion to the porous sintered metal can be imparted to the sliding part coating resin composition. .

  In addition, from the description of Example 6, “When a PAI resin having a relatively low tensile strength but a relatively high elongation under a temperature condition of 25 degrees Celsius is used as a PAI resin component in the resin composition for covering a sliding part, It can be seen that the sliding portion coating resin composition is less likely to break even when the moving portion becomes hot. Accordingly, when such a PAI resin is used as the PAI resin component in the sliding portion coating resin composition, the sliding portion coating resin composition is imparted with high adhesion to the porous sintered metal substrate. Can do.

  The PAI resin used in the examples is an aromatic polyamide-imide resin or the like. For example, the tensile fracture strength and elongation can be adjusted by copolymerizing a specific aramid diamine with an aromatic diamine. .

<Features of oscillating rotary compressor>
In the oscillating rotary compressor 101 according to the present embodiment, sliding portions of the piston 121, the bush 122, and the head members 123 and 127 are coated with the sliding portion coating resin composition according to the present invention. For this reason, in the oscillating rotary compressor 101, even when the lubricating oil is not supplied and the sliding surface temperature rapidly rises, the sliding characteristics, wear resistance, and seizure resistance superior to those of the prior art are achieved. Etc. are realized. Moreover, this coating film is difficult to peel off.

  The sliding portion coating resin composition according to the present invention can impart sliding properties, wear resistance, seizure resistance, and the like superior to conventional sliding portions such as compressors and engines and is peeled off. It has a feature that a difficult coating film can be formed, and can be applied to any mechanical device having a sliding portion.

1 is a longitudinal sectional view of a rocking rotary compressor according to an embodiment of the present invention. It is a top view of a cylinder block concerning an embodiment of the invention. It is a cross-sectional view of the cylinder chamber of the oscillating rotary compressor according to the embodiment of the present invention. It is the schematic of a limit surface pressure test apparatus. It is a perspective view of the braid | blade employ | adopted as a limit surface pressure test apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Oscillating rotary compressor 110 Casing 111 Body casing part 112 Upper wall part 113 Bottom wall part 115 Oscillating rotary compression mechanism 116 Drive motor 117 Crankshaft 117a, 117b Eccentric shaft part 119 Suction pipe 120 Discharge pipe 121 Piston 121a Roller portion 121b Blade portion 122 Bush 123 Front head 123a Bearing portion 123b Opening 124 First cylinder block 124a, 126a Cylinder hole 124b, 126b Suction hole 124c, 126c Discharge passage 124d, 126d Bush housing hole 124e, 126e Blade housing hole 125 Middle plate 126 Second cylinder block 127 Rear head 127a Bearing portion 190 Bolt 151 Stator 152 Rotor 153 Coil end 160 Muffler 210 Accumulation (Gas-liquid separator)
L Lubricating oil Rc1 First cylinder chamber Rc2 Second cylinder chamber

Claims (6)

A polyamideimide resin having a tensile strength of 40 MPa or more at a temperature of 100 degrees Celsius and occupying 50 to 80 wt% with respect to the total weight;
Polytetrafluoroethylene powder occupying 15 wt% or more of the total weight;
A resin composition for covering a sliding part. The sliding part coating resin composition according to claim 1, wherein the polyamideimide resin has a tensile strength of 30 MPa or more under a temperature condition of 200 degrees Celsius. A polyamideimide resin having a tensile strength of 110 MPa or more and 180 MPa or less under a temperature condition of 25 degrees Celsius and occupying 50 to 80 wt% with respect to the total weight;
Polytetrafluoroethylene powder occupying 15 wt% or more of the total weight;
A resin composition for covering a sliding part. A polyamide-imide resin having an elongation of 40% to 150% at a temperature of 25 degrees Celsius and occupying 50 to 80 wt% with respect to the total weight;
Polytetrafluoroethylene powder occupying 15 wt% or more of the total weight;
A resin composition for covering a sliding part. With fluoride,
The resin composition for covering a sliding part according to any one of claims 1 to 4, further comprising aluminum oxide powder. The sliding part coating resin composition according to claim 5, wherein the fluoride is at least one fluoride selected from the group consisting of calcium fluoride (CaF ₂ ) and strontium fluoride (SrF ₂ ).

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