JP2017082179A - Sliding material and plain bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sliding material excellent in heat resistance and chemical resistance and using an aliphatic polyketone resin which is cheaper than sliding material made from other synthetic resin.SOLUTION: Graph 3-1 and 4-1 show measurement results of friction coefficient and comparative abrasion quantity of test piece 1-1 of an aliphatic polyketone resin to which jojoba oil of 0.5 mass% is blended, Graph 3-2 to 3-4, 4-2 to 4-4 show measurement results of friction coefficient and comparative abrasion quantity of test pieces 1-2 to 1-4 of an aliphatic polyketone resin to which jojoba oil of 2 mass% is blended, Graph 3-5 and 4-5 show measurement results of friction coefficient and comparative abrasion quantity of comparative example 1-5 of an aliphatic polyketone resin to which PTFE powder is blended, Graph 3-6 and 4-6 show measurement results of friction coefficient and comparative abrasion quantity of comparative example 1-6 consisting of the aliphatic polyketone resin. From this result, enhancement of sliding performance can be expected by using the aliphatic polyketone resin to which jojoba oil of 1 mass% is blended.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sliding material, and more particularly to a sliding material suitable for a sliding bearing.

  Conventionally, a sliding material made of a synthetic resin is known as a sliding material for a sliding bearing. For example, Patent Document 1 discloses polyacetal resin, polyamide resin, polybutylene terephthalate resin, polyphenylene sulfide resin, polyetherimide resin, polyethersulfone resin, polycyanoarylether resin, polyetherketone resin, polyamideimide resin, and polyimide. A sliding material for a sliding bearing formed by blending a base resin selected from resins with a filler selected from polytetrafluoroethylene resin, carbonate, copper powder, zinc powder, and copper oxide powder. It is disclosed.

JP 2001-139777 A

  In recent years, aliphatic polyketone resins have been attracting attention because the raw material monomers are cheaper than other synthetic resins having equivalent heat resistance. However, although the aliphatic polyketone resin is excellent in heat resistance and chemical resistance, the aliphatic polyketone resin alone is not suitable as a sliding material for a sliding bearing because it has a high friction coefficient and a large amount of wear.

  The present invention has been made in view of the above circumstances, and its object is to make a slide using an aliphatic polyketone resin that is excellent in heat resistance and chemical resistance and is cheaper than other synthetic resin sliding materials. To provide moving material.

  The present inventor has found that sliding performance can be improved by blending an oily agent with an aliphatic polyketone resin. Here, in order to prevent the oily agent blended in the aliphatic polyketone resin from vaporizing in a high temperature state at the time of molding the sliding material, the oily agent blended in the aliphatic polyketone resin is more than the melting point of the aliphatic polyketone resin. Use one having a high boiling point. Moreover, what contains a fatty acid, fatty acid ester, or alcohol is preferable for an oil-based agent, for example, jojoba oil can be used.

  According to the present invention, sliding performance can be improved by using an aliphatic polyketone resin blended with an oily agent, so that it is excellent in heat resistance and chemical resistance, and in other synthetic resin sliding materials. In comparison, a sliding material using an inexpensive aliphatic polyketone resin can be provided.

FIG. 1 is a diagram for explaining a sliding performance test of a sliding material according to an embodiment of the present invention. FIG. 2 is a diagram showing the measurement results of the sliding performance test performed on the test pieces 1-1 to 1-4 and Comparative Examples 1-5 and 1-6 shown in Table 2 under the conditions shown in Table 1. It is.

  Embodiments of the present invention will be described below.

  The sliding material according to the present embodiment is formed of an aliphatic polyketone resin in which an oily agent such as a higher fatty acid, a higher alcohol, an amine, an ester, or a metal soap is blended. Here, in order to prevent the oily agent blended in the aliphatic polyketone resin from being vaporized during the molding of the sliding material, the oily agent blended in the aliphatic polyketone resin is based on the melting point (240 degrees) of the aliphatic polyketone resin. Use one having a high boiling point. The oily agent preferably contains a fatty acid, a fatty acid ester, or an alcohol. For example, jojoba oil can be used.

  Moreover, it is preferable that the ratio with respect to the sliding material of the oil-based agent mix | blended with aliphatic polyketone resin shall be 1-10 mass%. When the ratio of the oily agent to the sliding material is less than 1% by mass, there is no significant difference in sliding performance as compared with the case of the aliphatic polyketone resin alone. On the other hand, as the ratio of the oily agent to the sliding material increases, the oily agent may not be evenly dispersed in the aliphatic polyketone resin.

  Therefore, the oily agent is held in a holding agent such as carbon powder or graphite powder, and this holding agent is blended with the aliphatic polyketone resin, so that the oily agent is not separated from the aliphatic polyketone resin, so that Can be more evenly distributed.

  The inventor conducted various tests on the sliding material according to the present embodiment.

  As materials for the sliding material used in various tests, “M330A (trade name)” manufactured by Hyosung is used as the polyketone resin, and “Johova Golden (trade name)” imported from Mitsuba Trading is used as jojoba oil. In addition, “Bellpearl (registered trademark) C2000 (trade name)” manufactured by Air Water Belpearl Co. is used as the carbon powder, and “KTL620 (trade name)” manufactured by Kitamura Co., Ltd. is used as the PTFE (polytetrafluoroethylene) powder. Used.

  FIG. 1 is a diagram for explaining a sliding performance test of a sliding material according to the present embodiment.

  As shown in the drawing, the present inventor prepares a plate-shaped test piece 1 as a sliding material according to the present embodiment, and a cylindrical counterpart 2 on a sliding surface (surface) 10 of the test piece 1. Was placed. Then, under the conditions shown in Table 1 below, a load N in the direction of the axis O is applied to the back surface 11 of the test piece 1, and the sliding surface 10 of the test piece 1 is used as the support target surface (end surface) 20 of the mating member 2. While pressing, the mating member 2 is rotated in the rotation direction R around the axis O, and the torque in the rotation direction R of the sliding member 2 at that time is detected by a load cell (not shown). The test which measures the friction coefficient between the moving surface 10 and the support target surface 20 was done. Further, after the test, the wear scar depth (abrasion trace cross-sectional curve) at the arrow A of the sliding surface 10 was measured. The support target surface 20 of the counterpart material 2 was ground, then handler-wrapped with water-resistant abrasive paper # 400 and the like, and further washed with acetone.

  Further, as shown in Table 2 below, test pieces 1-1 to 1-4 having four kinds of blending ratios are prepared as the test piece 1, and two kinds of comparative examples 1-5 and 1- 1 are prepared as comparative examples. 6 was prepared. Moreover, these test pieces 1-1 to 1-4 and Comparative Examples 1-5 and 1-6 were produced by injection-molding pellets having a blending ratio shown in Table 2 into a plate shape. Specifically, first, it is put into a twin-screw vent type extruder, melt-kneaded, and molded to produce a string-shaped molded product. After that, the string-shaped molded product is cut to mix pellets. Produced. Then, this mixed pellet was molded with a screw-type injection molding machine to produce test pieces having the shapes shown in Table 1.

  FIG. 2 is a diagram showing the measurement results of the sliding performance test performed on the test pieces 1-1 to 1-4 and Comparative Examples 1-5 and 1-6 shown in Table 2 under the conditions shown in Table 1. It is. Here, the left vertical axis indicates the friction coefficient, and the right vertical axis indicates the specific wear amount. The specific wear amount is obtained by multiplying the average value of the wear scar depth at the arrow A of the sliding surface 10 by the wear scar area (contact area between the sliding surface 10 and the support target surface 20) to obtain the wear volume. The volume was determined by dividing by the load N and the sliding distance at the end of the test.

  In FIG. 2, graphs 3-1 to 3-4 show the measurement results of the friction coefficients of the test pieces 1-1 to 1-4, and graphs 3-5 and 3-6 show comparative examples 1-5, The measurement result of the friction coefficient of 1-6 is shown. Graphs 4-1 to 4-4 show the measurement results of the specific wear amount of the test pieces 1-1 to 1-4, and graphs 4-5 and 4-6 show Comparative Examples 1-5 and 1-4, respectively. The measurement result of the specific wear amount of −6 is shown.

  As shown in the drawing, the friction coefficient of Comparative Example 1-6 containing 100% by mass of the aliphatic polyketone resin is 0.54 (Graph 3-6). Moreover, the friction coefficient of the test piece 1-1 which mix | blended 0.5 mass% of jojoba oil is 0.53 (graph 3-1). Therefore, in the blending of jojoba oil of about 0.5% by mass, no significant difference was found in the friction coefficient with respect to 100% by mass of the aliphatic polyketone resin. On the other hand, the friction coefficient of the test piece 1-2 containing 2% by mass of jojoba oil is 0.07 (Graph 3-2), and the friction coefficient of the test piece 1-3, 1-4 containing 3% by mass is 0.08. 0.07 (graphs 3-3 and 3-4), which is overwhelmingly smaller than 100% by mass of the aliphatic polyketone resin, and the friction coefficient of Comparative Example 1-5 in which 15% by mass of PTFE powder was blended was 0. 19 (graph 3-5) is sufficiently small. Here, the test piece 1-1 contains 1% by mass of carbon powder, and the test piece 1-4 contains 0.3% by mass of carbon powder. On the other hand, the test pieces 1-2 and 1-3 do not contain carbon powder. As is clear from the graphs 3-1 to 3-4 of these test pieces 1-1 to 1-4, the influence on the friction coefficient by the blending of the carbon powder was not observed.

Further, the specific wear amount of Comparative Example 1-6 with 100% by mass of the aliphatic polyketone resin is 11.8 × 10 ⁻⁶ mm ³ / Nm (Graph 4-6). On the other hand, the specific wear amount of the test piece 1-1 containing 0.5% by mass of jojoba oil is 10.6 × 10 ⁻⁶ mm ³ / Nm (graph 4-1), and 2% by mass of jojoba oil was added. The specific wear amount of the test piece 1-2 is 0.25 × 10 ⁻⁶ mm ³ / Nm (graph 4-2), and the specific wear of the test pieces 1-3 and 1-4 in which 3% by mass of jojoba oil is blended. the amount is ^{0.35 × 10 -6 mm 3 /Nm,0.25×10 -6} mm 3 / Nm ( graph 4-3 and 4-4). As described above, the test piece 1-1 contains 1% by mass of carbon powder, and the test piece 1-4 contains 0.3% by mass of carbon powder. On the other hand, the test pieces 1-2 and 1-3 do not contain carbon powder. As apparent from these test pieces 1-1 to 1-4 and graphs 4-1 to 4-4 and 4-6 of Comparative Example 1-6, in the blending of 0.5% by mass of jojoba oil, Although the specific wear amount cannot be made sufficiently small with respect to 100% by mass of the polyketone resin, the composition of jojoba oil of 2% by mass or more is reduced to 100% by mass of the aliphatic polyketone resin regardless of the presence or absence of carbon powder. On the other hand, the specific wear amount could be sufficiently reduced.

  Therefore, from the above test results, by blending 1% by mass or more of jojoba oil, the sliding performance can be improved with respect to 100% by mass of the aliphatic polyketone resin. Conceivable. In addition, by using carbon powder or graphite powder as a jojoba oil retaining agent, more oily agent can be evenly dispersed and blended without being separated from the aliphatic polyketone resin. Further improvement in sliding performance can be expected compared to the case where no agent is used.

  As described above, according to the present embodiment, by using an aliphatic polyketone resin blended with jojoba oil, which is an oily agent, sliding performance can be improved, so heat resistance and chemical resistance are excellent. In addition, it is possible to provide a sliding material using an aliphatic polyketone resin which is less expensive than other synthetic resin sliding materials having the same heat resistance.

  This is considered to be due to the following reason. That is, the aliphatic polyketone resin is one in which a large number of ketones are linked, and a carbonyl group is arranged in the main chain as shown in Chemical Formula 1 below.

  Here, as shown in the chemical formula 2 below, the carbonyl group is polarized with carbon C and oxygen O charged to + and −, respectively.

  As described above, the aliphatic polyketone resin is considered to be a resin having polarity, and the surface of the aliphatic polyketone resin is considered to be in an active state in which it easily binds to other substances.

Jojoba oil has a fatty acid ester shown in Chemical Formula 3 below. R ₁ and R _{2 in} Chemical formula 3 represent a long-chain hydrocarbon group.

  Fatty acid esters are also considered to have polarity with carbon-oxygen bonds. For this reason, it is thought that jojoba oil containing a fatty acid ester is retained on the surface of a highly polar aliphatic polyketone resin and exhibits a lubricating effect as an oily agent. The same lubricating effect can be expected with fatty acids, alcohols, and the like that are also considered to have polarity. Here, as a structure that exhibits the effect of the oil-based agent, it is considered desirable to be a fatty acid ester, fatty acid, or alcohol having a long-chain hydrocarbon group.

  The sliding material of the present invention can be used for various sliding mechanisms. In particular, it is suitable for a sliding bearing.

  1: sliding material, 2: mating material, 10: sliding surface (front surface) of sliding material 1, 11: back surface of sliding material 1, 20: support target surface (end surface) of mating material 2

Claims (6)

An aliphatic polyketone resin;
An oily agent blended with the aliphatic polyketone resin and having a boiling point higher than the melting point of the aliphatic polyketone resin. The sliding material according to claim 1,
The oil-based agent contains a fatty acid, a fatty acid ester, or an alcohol. The sliding material according to claim 2,
The oil-based agent is jojoba oil. The sliding material according to any one of claims 1 to 3,
Further, a sliding material characterized in that a retaining agent is blended. The sliding material according to claim 4,
The sliding agent is carbon powder or graphite powder.   A sliding bearing formed of the sliding material according to any one of claims 1 to 5.

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