JPS5989825A - Phenol resin composition for sliding member - Google Patents

Abstract

PURPOSE:To improve characteristics of a sliding member by using phenol resin as a substrate and compounding the resin, a carbon fiber, cotton tissue, thermoplastic synthetic resin, solid lubricant or lubricating oil to improve the mechanical strength and abrasion characteristic and to have a property for giving no damage to the other material. CONSTITUTION:The first composition is composed of 10 to 50wt% of carbon fiber, 10 to 45wt% of cotton tissue, 3 to 10wt% of thermoplastic synthetic resin, 1 to 20wt% of solid lubricant and the residue of phenol resin. The second composition is composed of 10 to 50wt% of carbon fiber, 10 to 45wt% of cotton tissue, 3 to 10wt% of thermoplastic synthetic resin, 1 to 20wt% of solid lubricant, 1 to 5wt% of lubricating oil and the residue of phenol resin. According to the present invention, as a reinforcing base material, cotton tissue is used in combination with a carbon fiber to improve the mechanical strength of a sliding member, and the defect of the carbon fiber is overcome and self-librication is given by thermoplastic synthetic resin. The solid lubricant is adapted to give self-lubrication in cooperation with the thermoplastic synthetic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a resin composition for sliding members, in particular, a phenonyl resin as a base material, which is blended with carbon fiber and cotton cloth as a reinforcing base material, and further blended with a thermoplastic synthetic resin and a solid lubricant. The present invention relates to a phenolic resin composition for sliding members, which contains a lubricating oil in addition to the above-mentioned components.

In the present invention, the sliding member refers to a member that has a surface that slides in low-friction contact with a mating member and supports a load or transmits the load to another member, such as a bearing bush, a sliding plate, a cam, and a member for both wheels. Phenolic resin sliding members using cotton cloth, asbestos, wood flour, etc. as reinforcing base materials have been well known, and have been used for the purpose of improving the mechanical properties of sliding members. It is also well known to use reinforcing substrates such as glass fibers or carbon fibers.

However, sliding members based on phenonyl resin can generally only be used under P1 conditions such as oil or water supply.

This is because the above-mentioned reinforcing base material itself does not exhibit any lubricity.

Therefore, various sliding members have been proposed in which solid lubricants such as fish boat, molybdenum disulfide, and polytetrafluoroethylene resin powder are blended to improve lubricity.
It is not necessarily satisfactory in terms of the mechanical properties, mechanical strength, etc. of M as a sliding member.

For example, in order to improve frictional properties, the solid lubricant described above must be blended in a large amount to be effective; In addition, in order to improve the wear resistance, it is possible to increase the surface hardness of the sliding member by blending hard carbon drifted fibers. If it slides on the shaft, it may bite the mating material or, in other words, cause damage to the mating material.

In particular, as a sliding member, it is necessary to avoid damaging the mating material.

The present invention was made in view of the above points, and is a sliding member based on phenolic resin, which has improved mechanical strength and friction and wear characteristics, and has the property of not damaging the mating material. The technical problem is to develop a phenolic resin composition for sliding members.

The structure of the present invention, that is, the technical means for achieving the above technical problem is as follows.

That is, the first configuration uses two-enol resin as a base,
ml of phenolic resin for sliding parts, which is mixed with a certain amount of carbon fiber, cotton cloth, thermoplastic synthetic resin, and solid lubricant.
The second composition has a phenolic resin as its base, and contains carbon fiber on the foot side, cotton cloth, thermoplastic synthetic resin, solid hydrant, and lubricating oil for sliding members. It is a phenolic resin composition.

More specifically, the first configuration has a weight ratio of carbon fiber lO
~50%, cotton cloth 10-45%, thermoplastic synthetic resin 3-1
0%, solid lubricant 1 to 20%, and the balance phenolic resin.
45%, 3 to 10 parts of thermoplastic synthetic resin, 1 part of solid lubricant
-20% lubricating oil, 1 to 5% lubricating oil, and the balance phenolic resin composition for sliding members.

In the above structure, the carbon fibers mixed with the phenolic resin as a reinforcing base material do not themselves exhibit any lubricity, but the carbon fibers mixed with the phenolic resin improve mechanical properties, especially surface hardness. The cotton fabric improves the abrasion resistance of the sliding member, and the cotton fabric also improves the mechanical strength of the sliding member.

The blending amount of these reinforcing base materials is determined depending on the intended use of the sliding member.

For example, when a sliding member is used under wet conditions, a large amount of carbon fiber is added to take into account the swelling of the sliding member, and when the sliding member is required to have strength. For example, use a large amount of cotton cloth.

The above-mentioned prevention of swelling of sliding members during water lubrication can be achieved by using carbon fiber alone as a reinforcing base material for phenolic resin, but carbon fiber has poor adhesion with phenolic resin. However, the mechanical strength of the sliding member is low, and its use is limited to low load conditions, which limits the range of use of the sliding member.

Therefore, in the present invention, in addition to carbon fiber, cotton fabric with good adhesion to phenol resin is used as a reinforcing base material in order to improve the mechanical strength of the sliding member without impairing the effect of carbon fiber. Moreover, it can be used even in applications where the usage conditions are severe, such as bearings for rolling rollers (roll neck bushings) for steel manufacturing, where impact loads are applied.

In this way, the use of cotton cloth as a reinforcing base material requires some sacrifice in terms of preventing the sliding member from swelling during water lubrication, but it has the advantage of greatly expanding the range of applications of the sliding member. Compensated. .

Table 1 shows the results of testing the mechanical properties and swelling amount in water of reinforcing base materials for phenolic resins and phenol resin moldings filled with the reinforcing base materials.

The swelling plt in the first shishikasa was measured by heating the water to 60° C., immersing it in the warm water for 20 days, taking it out, and measuring the amount of change in dimension.

Therefore, the blending amount of the reinforcing base material with respect to the phenolic resin can be up to 60% by weight, and within this range, depending on the above-mentioned use, it can be blended with Ru.

The carbon fiber used as the reinforcing base material 1 in the present invention has a large ratio of diameter to fiber length L, that is, L/D (aspect ratio), and has a large mechanical strength (high surface hardness). Although it is possible to obtain a shoulder sliding member, the fibers are too thin.
If the length is too long, it will be difficult to mix with the resin and cotton cloth, the uniform dispersion of the fibers will be impaired, and there will be difficulty in molding, so it is necessary to choose an optimal length.

The present inventors have confirmed through experiments that the diameter is as thin as possible, with a diameter of 30 microns or less, preferably 20 microns or less, and that I4/D is 10 or more.

That is, this material is macroscopically powdery, but microscopically it is fibrous chimpgeen.

When the L/D of carbon fiber becomes smaller than 10 υ, the powder shape changes from fiber powder to granular powder.
This increases the wear of the mating material and also impairs the wear resistance of the sliding member.

The carbon fibers used include chemical fibers such as acrylic, rayon, and vinyl fibers, those obtained using other thermosetting synthetic resins as raw materials, or those obtained using lignin, pinch, etc. as raw materials.

The thermoplastic synthetic resin is blended into a composition made of phenolic resin and carbon fiber-woven cotton cloth, and particularly compensates for the drawbacks of carbon fiber and provides self-lubricating properties to sliding members.

In other words, as mentioned above, carbon fiber as a reinforcing base material contributes to improving the mechanical properties and wear resistance of the sliding member, but on the other hand, it is exposed to the friction surface of the sliding member and causes damage to the sliding member. It has the disadvantage of biting the other material when it comes into friction with the material.

This property of biting the other material is the other material ttJ! This is a property that must be avoided as much as possible for moving parts because it can cause damage.

In the present invention, by blending a thermoplastic synthetic resin and scattering the synthetic resin on the male sliding surface of the sliding member, the above-mentioned drawback of carbon fiber, which has the tendency to bite the mating material, can be overcome. It is something that

The thermoplastic synthetic resin scattered on the friction surface is partially transferred to the mating surface 11'-F due to friction with the mating material, forming a thermoplastic synthetic resin film on the surface of the mating material, This is because friction occurs through the thermoplastic synthetic resin coating between the mating member, the sliding member, and the cage. It has been experimentally confirmed that the above-mentioned effect of the thermoplastic synthetic resin is particularly noticeable under high load conditions.

As thermoplastic synthetic resins, polyethylene: yif, fat 1
, polyolefin resins such as polypropylene resins, polyamide resins, and polyacetal resins.

Since these thermoplastic synthetic resins themselves have self-lubricating properties, they impart self-lubricating properties to sliding members in addition to the above-mentioned effects, and when used in combination with solid lubricants described below, the frictional characteristics of sliding members can be improved. It is something that will make you even more proud.

The above-mentioned thermoplastic synthetic resins, especially polyolefin resins, are compatible with lubricating oils, which will be described later, so they exhibit properties as a retainer that absorbs and retains lubricating oils or adsorbs and retains lubricating oils on friction surfaces. It has the effect of significantly improving properties (low coefficient of friction)1, and the appropriate amount of thermoplastic synthetic resin is 3 to 10% by weight.

Since the thermoplastic synthetic resin has a lower specific gravity than the carbon fibers, a comparatively small amount of the resin will be effective, and a large amount will have a negative effect on the solid lubricant described later.

The solid lubricant is blended with the above components and works particularly with the thermoplastic synthetic resin to impart self-lubricating properties to the sliding member.

As solid lubricants, graphite, molybdenum disulfide,
One or more selected from tungsten disulfide, metal soap, and polytetrafluoroethylene resin powder are used.

These solid lubricants are used when the sliding member is attached to the carbon fiber.
Since the Jff surface hardness is square, the lubricating effect is fully exhibited on the friction surface of the sliding member, but it is preferable to select and use it as appropriate depending on the purpose of use of the sliding member.

For example, when sliding members are used under water-lubricated conditions, graphite, metal soap, or polytetrafluoroethylene resin, which has particularly good compatibility with water, should be selected, and when used under oil-lubricated conditions. In such cases, molybdenum disulfide, tungsten disulfide, or polytetrafluoroethylene resin may be selected and used.

If a large amount of solid lubricant is blended in order to improve frictional characteristics, the strength of the sliding member will be reduced, so special care must be taken when determining the amount of solid lubricant to be blended.

Although the amount of the solid lubricant to be blended is determined in consideration of the amount of the thermoplastic synthetic resin, it has been experimentally confirmed that a blending amount of approximately 1 to 20% by weight is appropriate in the present invention.

When the blending amount of the thermoplastic synthetic resin mentioned above is set at the upper limit, the blending amount of this solid lubricant is set at the lower limit, and conversely, when the blending amount of the thermoplastic synthetic resin is set at the lower limit, this solid lubricant By setting the blending amount to the upper limit, the synergistic effect of both can be fully exhibited.

When mixed with the above-mentioned component composition, the oil can further improve the friction properties and enable the sliding member to be used under dry friction conditions.

As the lubricating oil, mineral oil or synthetic lubricating oil is selected and used, and the appropriate blending amount is 1 to 5% by weight.

Here, Table 2 shows the component compositions of the phenolic resin compositions for sliding members having the first and second configurations of the present invention described above.

The composition having the first composition shown in Table 2 is suitable for use under water or oil lubrication conditions, and the composition having the second composition is suitable for use under oil or dry lubrication conditions. Ru.

Although the phenol resin was described as the remainder, good results were obtained in experiments by Nagisa et al. in the present invention by blending the amount in the range of 3() to 50 liters.

If it is less than 30% by weight, mechanical strength will decrease by 1 degree and moldability will also be adversely affected.

If the amount exceeds 50% by weight, the resin will tend to separate, which will adversely affect its mechanical strength.

Then, these compositions are loaded into a high-speed rotating stirrer, mixed uniformly, and then dried to form a granular molding material, which is then molded into a desired sliding member.

By adopting the configuration of the present invention as described above,
You can get the same effect.

■ By using carbon fiber and cotton cloth together as a reinforcing base material, the optical surface hardness of the sliding member is increased to improve the abrasion resistance and the mechanical strength of the sliding member.
! ! It can be used even under severe conditions where a $ load is applied.

■Friction surface of the sliding member (due to the scattered presence of thermoplastic synthetic resin), during friction with the mating material, a film of the thermoplastic synthetic resin is formed on the surface of the mating material, and the sliding member and the mating material Since this results in friction through the coating, the disadvantage of biting the carbon fiber counterpart material can be completely eliminated.

■The self-lubricating properties of thermoplastic synthetic resins and solid lubricants, or the lubricating oil blended in addition to these, further improve the friction characteristics of sliding members.

Examples will be described below.

(l) 1 Example of the first configuration of the present invention [Example I] Carbon fiber (chopped fiber manufactured by Kureha Chemical Industry Co., Ltd., C
F-OL, diameter 10 microns, length 100 microns) 30 weight - 1 cotton cloth lO weight'M%, polyethylene resin powder (Mitsui Petrochemical Co., Ltd. Hyzenkus 5000H) 7-layer I
k%, graphite 3 weight - 2 balance phenolic resin (solid content 50
(applied as a festival) at high speed rotation (1500rprn
/h) The mixture was loaded into a stirrer, mixed uniformly, and granulated.

This is then dried in a hot air dryer at a temperature of 80 to 90°C for about 1 hour.
After drying for several hours, a molding material was obtained.

This molding material is placed in a mold at a temperature of 150℃ and a pressure of 200Ki.
Molded from Al, inner diameter 10m, outer diameter 17 gates, length 13++
A cylindrical bush (sliding member) of m was obtained.

[Example ■]

20% by weight of carbon fiber (same as in Example 1), % weight of cotton cloth, 3% by weight of polyamide resin (11-nylon) powder, 7% by weight of polytetrafluoroethylene resin powder, 3% by weight of metal soap, balance phenol resin. A cylindrical bush having an inner diameter of 10 mm, an outer diameter of 17 tttm, and a length of 13 mm was obtained by the same method as in Example I (applied as a face with a solid content of bO%).

The cylindrical bunsch obtained in Example 1 and Example 2 above was used as a test piece, and the mating material was made of 8450 (carbon steel for mechanical structures) and the end surface was brought into sliding contact with the friction speed 26nvdR1.
Figure 1 shows the results of testing changes in the coefficient of friction in water by applying a load of 10K at 10 minute intervals.

Also, in water, the friction speed is 2.5 m/h, the load is 100
Figure 2 shows the results of testing changes in wear amount over a test time of 8 hours.

In FIGS. 1 and 2, symbol A indicates the test result of Example 1, and symbol B indicates the test result of Example H.

In addition, the symbol CFi in FIGS. 1 and 2 is a phenolic resin sliding member made of conventional cotton fabric as a reinforcing base material and blended with io weight % graphite to the same dimensions as in Example I. These are the test results for the cylindrical bushings obtained.

The test results show that the sliding member made of the composition of the present invention is not affected by increases in load, exhibits a stable low coefficient of friction even under high loads, and has extremely low wear.

After the test, no surface damage #'i was observed on the mating material, and a film of thermoplastic synthetic resin and solid lubricant was formed at the interface.

On the other hand, conventional products have a high coefficient of friction, and the amount of wear increases significantly over time.

Swelling in water between the above embodiment and the conventional product! The results of the test for 5-jJ are shown in FIG.

The test method is to heat the water to 60°C, and add 2
After being immersed for 0 days, the samples were taken out and the rate of change in dimensions was measured.

In the figure, A#i is Example 1, B is Example 2, and C is a conventional product.

For comparison, the numbers are for carbon fiber 4 as the reinforcing base material.
The amount of swelling of a phenolic resin molded product containing 0% by weight is shown.

From the test results, the amount of swelling in water of the sliding member made of the composition of the present invention is not as great as that of carbon fiber alone as a reinforcing base material, but it can be said to be a significant improvement when compared with conventional products.

From the results of the manufacturing tests in the examples above, the sliding member made of the composition of the present invention exhibits good friction and wear characteristics under water lubrication conditions and under high loads.

In addition, the amount of swelling in water is less than that of conventional products.
- Coupled with the above-mentioned friction and wear characteristics, the range of applications of the sliding member can be expanded.

(2) Example of the second configuration of the present invention [Example I] Carbon fiber (same as Example I) 20% by weight, weighted cotton cloth, polyethylene/resin (same as Example I) powder 5
Molybdenum disulfide 3% by weight, mineral oil (SAE 30
) 2% by weight, the balance phenolic resin (applied as 50% solids phenol) in the same manner as in Example I above, with an inner diameter of 10
A cylindrical bushing with an outer diameter of 17 mm and a length of 13 mm was obtained.

This cylindrical bushing was used as a test piece, and a mating material of 5450 (
The end faces were brought into sliding contact using carbon steel (carbon steel for mechanical structures), a friction speed of 2.6 rn/m was applied, a load of 1 OKy was applied at 10 minute intervals, and the coefficient of male friction was determined by applying grease to the friction surface at startup. Figure 4 shows the results of testing changes in . In the figure, symbol E indicates the test result of Example I, and symbol F indicates the test result of the conventional product described above.

The test results showed that the sliding member made of the composition of the present invention always exhibited stable performance with a low coefficient of friction.

In particular, the friction surfaces were kept wet by lubricating oil and grease.

Furthermore, no scratch #'i was observed on the different surface of the mating material after the test.

On the other hand, the conventional product exhibited a relatively low coefficient of friction during startup due to the lubricity of the grease, or the coefficient of friction increased as the load movement increased.

This is because the grease on the friction surface is expelled from the friction surface as the load increases, resulting in a lack of lubricity due to the grease.

From the examples described above, the phenolic resin composition for sliding members of the present invention improves the friction and wear characteristics and mechanical strength of sliding members, and maintains its properties even under severe conditions such as impact loads. It exhibits excellent performance under water lubrication conditions, oil lubrication conditions, and even dry friction conditions.

[Brief explanation of the drawing]

Figure 1 is a graph comparing the changes in the friction coefficient between the inventive product and the conventional product, WL2 is a graph comparing the changes in the worn parts between the inventive product and the conventional product, and Figure 3 is the graph comparing the inventive product and the conventional product. Figure 4 is a graph comparing the change in friction coefficient between the product of the present invention and the conventional product. A, B, E... Invention products C, D, F... Conventional products Patent applicant Oiles Industries Co., Ltd.

Claims (1)

[Claims] (l) 10-50% carbon fiber by weight ratio, cotton cloth 10-4
5%, thermoplastic synthetic resin 3-10%, solid lubricant 1-2
A phenolic resin composition for sliding members consisting of 0% and the balance phenolic resin. (2) Carbon fiber lO ~ 50%, cotton cloth Io ~ 4 at a weight ratio of 0
5%, thermoplastic synthetic resin 3-10%, solid lubricant 1-2
A phenolic resin composition for removing sliding parts, consisting of 0% lubricating oil, 1 to 5% lubricating oil, and the balance phenolic resin. (3) The phenolic resin composition for sliding members according to claim 1 or 2, wherein the thermoplastic synthetic resin is selected from polyolefin resins, polyamide resins, and polyacetal resins. (4) The solid lubricant is selected from one or more of graphite, molybdenum disulfide, tungsten disulfide, polytetrafluoroethylene resin, and metal soap as described in claim 1'g4 or 2. A phenolic resin composition for sliding parts.