JP2851532B2 - Sliding composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slidable composition used for parts requiring slidability and abrasion resistance, such as, for example, piston rings, rod packings and bearings.

[0002]

2. Description of the Related Art Conventionally, as a slidable composition used in a portion such as the above-mentioned example, for example, a heat-resistant resin such as a wholly aromatic polyester, polyimide, polyphenylene sulfide, etc. There is a composition in which an appropriate amount of a resin is added, and further, an appropriate amount of a filler such as glass fiber, carbon fiber, calcium carbonate, talc, glass powder, copper, and mica is added.

However, the composition to which the above-mentioned filler is added has a large coefficient of friction and a large wear coefficient as shown in Table 2. Further, it has characteristics that the partner material is easily damaged and the aggressiveness is large. When using the composition in appropriate portions, large amount of wear occurring in the mating member, because it can such damage or breakage occurs, it is impossible to have you a long period of time to ensure a good sealing property. Or One, as shown in FIG. 3, wear coefficient between the composition PV value becomes higher rapidly increases, there is a problem that abnormal wear in the compositions and mating material occurs.

Further, since the composition and the mating material wear out in a short period of time, they need to be replaced periodically.
The composition using polyetherketone (PEK) (Japanese Patent Laid-Open No. 2-212539) is more expensive than the composition of the present invention using polyethersulfone (PES), and the price when commercialized is high. Since it becomes about 4 times to about 5 times, when the replacement time is shortened, the number of replacements inevitably increases, and there is a problem that the cost increases.

[0005]

[0006]

[0007]

[Problems that the Invention is to Solve The inventions is blended with polytetrafluoroethylene (PTFE) and polyethersulfone (PES) to the base resin of the composition, and a lubricating filler to the base resin, Plate-shaped as a wear-resistant filler
Wear resistance by blending with calcium titanate
And mechanical strength is remarkably improved, with excellent sealability have you a long period of time can be obtained, by reducing the replacement frequency, and an object thereof is to provide a sliding composition can be reduced in cost .

[0008]

Means for Solving the Problems] This inventions is 5% tetrafluoroethylene resin as a base resin constituting the composition
~ 85wt%, 50 ~ 5wt of polyether sulfone
%, And one or more of carbon, graphite, and molybdenum disulfide as a lubricating filler to be filled in the base resin, and 2 to 15 wt%.
As wear resistant filler is filled in a plate-like shape of the base resin, wherein the titanate potassium is slidability composition containing 5 wt% 30 wt%.

[0009]

According to the present invention, a tetrafluoroethylene resin and polyether sulfone are blended as a base resin of the composition, and one or more of carbon, graphite, and molybdenum disulfide are blended as a lubricating filler. and, since the blending platy titanate potassium as wear resistant filler, as shown in Table 2, as compared with conventional compositions,
It is the friction coefficient and wear coefficient is small of the composition constituting the present invention, since the sliding resistance is stable, wear resistance and <br/> mechanical strength is remarkably improved, and have you a long period of time Excellent sealing properties can be obtained. Moreover, since the damage to the mating member is small and the abrasion resistance is excellent, the life can be greatly extended, and the number of replacements can be reduced, so that the cost can be reduced.

[0010]

[0011]

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. The drawing shows a slidable composition used in a part where slidability and abrasion resistance are required. This slidable composition is obtained by adding a lubricating filler and an abrasion resistant filler to a base resin constituting the composition. The material is appropriately mixed and molded. That is, an appropriate amount of tetrafluoroethylene resin (PTFE) and polyethersulfone (PES) are blended as a base resin, and carbon powder (C), graphite (Gr), Any one or more of molybdenum disulfide (MoS2) is appropriately blended,
An appropriate amount of plate-like potassium titanate (PTW ) is blended as a wear-resistant filler to be filled in the base resin, and the shape and dimensions are appropriately determined by a free baking molding method (preliminary molding and firing in an electric furnace) described later. It is a composition molded into.

When the above-mentioned slidable composition is molded, for example, ethylene tetrafluoride resin is used as a base resin.
wt% -85wt%, polyether sulfone 50wt
% To 5 % by weight, as well as 2 to 15% by weight of one or more of carbon powder, graphite and molybdenum disulfide as a lubricating filler, and a plate-like potassium titanate as an abrasion-resistant filler. (Diameter = 10-30
μ, length = 80 μ-350 μ ) are blended in an amount of 5 wt% to 30 wt%, and then the composition raw materials are dry blended (dry mixing).
After the composition raw material is compression-molded to the appropriate shape and dimensions by the free baking molding method (after preforming, firing in an electric furnace),
A baking process is performed, and thereafter, a cutting process is appropriately performed to obtain the shape and dimensions.

The above-mentioned ethylene tetrafluoride resin is 50 wt.
% To 85% by weight, but when the amount is reduced to 50% by weight or less, the elongation (elasticity) of the composition decreases and the moldability deteriorates. On the other hand, if the content is increased to 85 wt% or more, sufficient wear characteristics cannot be obtained, and durability required for long-term use cannot be obtained. Or One, since cold flow resistance is remarkably lowered, preferably, 60 wt% 80 wt%
Is optimally used in the compounding range.

[0015] The polyether sulfone is used in an amount of 50 wt% to 5 wt%.
% Of are used in formulations range, charging and partial wear characteristics when weight loss amounts to less 5 wt% can not be obtained, improvement is not name by the addition. On the other hand, if the blending amount is increased to 50 wt% or more, the moldability deteriorates and problems occur in cutting and production, so that it is most preferable to use the blending amount in the range of 10 wt% to 30 wt%.

[0016] Carbon powder, graphite and molybdenum disulfide used as a lubricating filler are used in a base range.
It is best to use the formulation a range of 2 wt% 15 wt% with respect to. If the blending amount is reduced to 2 wt% or less, the effect of addition (reducing the wear coefficient, suppressing the heat generation temperature, and improving the wear performance) will not be noticeable. On the other hand, if the blending amount is increased to 15 wt% or more, the dispersibility decreases, and deformation and distortion occur, so that moldability deteriorates. Or One, fall off or peeling occurs filler formulated to moldings.

The plate-like titanate potassium to be used as wear-resistant filler, 5 wt% to 30 to the base range
It is optimal to use it in the blending range of wt%. If the amount is reduced to 5 wt% or less, the effect of strengthening the strength does not appear, and the improvement of the wear characteristics deteriorates. On the other hand, if the blending amount is increased to 30 wt% or more, the dispersibility of the filler decreases, and deformation or distortion occurs, so that the moldability deteriorates. Or One, because the fall off or peeling filler formulated in articles occurs, it is impossible to obtain a good molded product.

Further, by adding the surface treated titanate potassium in titanate coupling agent or silane coupling agent, adhesion between the filler and polyether sulfone better tetrafluoride the entanglement of the molecular chains of ethylene resins and polyether sulfone, slippage titanate potassium is suppressed, the mechanical strength and cold flow resistance are improved.

FIGS. 1 and 2 show a method for testing a slidable composition 1 using a Suzuki-type friction and wear thrust tester 2. The thrust tester 2 is an upper surface side of a turntable 3 constituting the tester 2. After the sliding member 1 is fixed to the sliding member 1 and the metal counterpart member 4 is pressed against the upper surface of the sliding member 1, the rotating member 3 is pressed while the rotating member 3 is rotated. The heat generation temperature and the coefficient of friction generated in the sliding portion of the sample are measured.

[0020] That is, when measuring the heating temperature, a thermocouple 5 inserted, converts the thermoelectromotive force generated in the connection point of the thermocouple 5 to the heating temperature at a position away approximately 3mm from the sliding portion of the mating member 4 And record it with a pen recorder (not shown). <br/> one or, when measuring the coefficient of friction, the contact Keru frictional resistance during sliding is detected by a load cell (not shown), and records the resistance value in a pen recorder.

Comparison of various characteristics such as wear coefficient and wear coefficient
For example , for example, ethylene tetrafluoride resin (PTF
E), polyether sulfone (PES), carbon powder (C), graphite (Gr), molybdenum disulfide (M
oS2), test pieces A , E , and F of the present invention prepared by appropriately mixing plate-like potassium titanate (PTW ) , ethylene tetrafluoride resin (PTFE), and wholly aromatic polyester (L
CP), polyphenylene sulfide (PPS), glass fiber (GF), and graphite (Gr), molybdenum disulfide (MoS2) as appropriate amount to become conventional for each specimen J, K, L, M, Comparative Example Test pieces B, C,
D, G, H, and I are tested under the same test conditions using the Suzuki friction and thrust tester 2 described above.

Table 1 below shows each test piece A, E,
F shows the compounding amounts of the test pieces B, C, D, G, H, I of the comparative example and the test pieces J to M of the conventional product.

[0023]

[Table 1]

[0024] When tested in each specimen A~M the same conditions described above, and have contact to the air at room temperature of the test temperature (about 25
° C), the material of the mating member is set to S45C, the test time is set to 0Hr to 4Hr for initial sliding, and 4Hr to 20Hr for constant sliding.
Set, One or a test surface pressure P, a test speed V, and set the test conditions described later and PV values Each specimen A~M it
Each is tested.

As a first test condition, the test surface pressure P is set to 0.
Set ^{29MPa.m / sec (3kgf / cm 2} ), set the test speed V to 1m / sec (100cm / sec) , 0.29 and PV values
Set to MPa.m / sec (300 kgf / cm ² · cm / sec). As a second test condition, the test surface pressure P is set to 0.59 MPa.m / se.
c (6 kgf / cm ² ) and the test speed V is 1 m / sec (1
00cm / sec) and the PV value is 0.59MPa.m / sec
(600 kgf / cm ² · cm / sec).

As a third test condition, the test surface pressure P is set to 0.
Set to 98MPa.m / sec (10kgf / cm ² ) and test speed V
Is set to 1 m / sec (100 cm / sec) and the PV value is 0.9
Set to 8MPa.m / sec (1000kgf / cm ² · cm / sec). Table 2 below shows each test piece A,
E and F, and the test pieces B, C, D, G, H and I of the comparative example,
The results of testing each of the conventional test pieces J to M are shown.

[0027]

[Table 2]

[0028] When measuring the wear coefficient K described in Table 2 above, each test piece had us in and after completion of the test and before the start of the study A
ＭM are weighed with an analytical balance, and the wear height W is determined from the wear weight M by the following equation (1).

[0029]

(Equation 1)

Further, from the wear height W, the test surface pressure P, the test speed V, and the test time H, the wear coefficient K is determined.
Is determined by the following equation (2).

[0031]

(Equation 2)

As is clear from the above test results, each of the test pieces A, E, and F of the present invention and the test pieces B, C, D, and
Although there is no significant difference in the coefficient of friction between G, H, I and each of the conventional test pieces J to M, as shown in FIG. Each test piece A, E,
F has a smaller wear coefficient, and the higher the PV value, the greater the difference between each of the test pieces A, E, F of the present invention and each of the test pieces J to M of the conventional product. Is proved. Or One, because the wear coefficient is stable, is excellent in mechanical strength.

As described above, a predetermined ratio of ethylene tetrafluoride resin and polyethersulfone is blended as the base resin constituting the slidable composition 1, and the lubricating filler is filled in the base resin. carbon powder, graphite, predetermined split one or more of molybdenum disulfide
Formulated by case, since the mixing at a predetermined ratio a plate-like titanium oxide <br/> Liu arm as wear resistant filler, as shown in Table 2, the conventional product each specimen J~ Compared with M, each of the test pieces A, E, and F of the present invention has a smaller coefficient of friction and a smaller coefficient of wear, and has a more stable slidability, so that wear resistance and mechanical strength are remarkably improved. it is possible to obtain an excellent sealing property had you a long period of time. In addition, since the damage to the mating member 4 is small and the abrasion resistance is excellent, the life is greatly extended, the number of replacements is reduced, and the cost can be reduced.

The present invention is not limited only to the configuration of the above embodiment. Above tetrafluoroethylene resin, polyether sulfone, carbon powder, graphite, molybdenum disulfide, bulking formulated and weight loss formulation within the range set to <br/> a plate-like titanate potassium advance, its intended use The above-mentioned slidable composition 1 may be formed by adjusting the amount of each component according to the usage conditions.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a test shape of a slidable composition.

FIG. 2 is a side view showing a method for testing a slidable composition using a Suzuki friction and wear thrust tester.

FIG. 3 is a characteristic diagram showing a relationship between a PV value of a test piece and a wear coefficient.

[Explanation of symbols]

 1: Sliding compositionStuff 4 … Material

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F16C 33/24 F16C 33/24 A F16J 9/28 F16J 9/28 // (C08L 27/18 81:06) (58) Survey Field (Int.Cl. ⁶ , DB name) C08L 27/18 C08K 3/04 C08K 3/24 C08K 3/30 C08L 81/06

Claims (1)

(57) [Claims] 1. A tetrafluoroethylene resin 5 0 to 85 wt% formulated as the base resin constituting the composition, a polyether sulfone with blending 50 to 5 wt%, lubricity filling filled in the base resin As a material, any one or more of carbon, graphite, and molybdenum disulfide are blended in an amount of 2 to 15 wt%, and as a wear-resistant filler to be filled in the base resin,
A plate-shaped sliding composition titanate potassium was. 5 to 30 wt% blend.