JPH11124591A - Combination of sliding member and mating member - Google Patents

Abstract

(57) [Problem] To provide a member having a lubricating film which is not squeezed out from a slip surface or broken on the slip surface. And when you need a slip,
Provided is a member in which effective low-friction sliding is performed. SOLUTION: The sliding member and the mating member, which are opposed to each other, are composed of two members, one of which or at least the sliding surface of the member is made of a synthetic resin having self-lubricating properties, and the other is opposed to the other. The slip surface of the member is composed of at least a coating film of a composition comprising an epoxy resin and a reactive silicone oil having an epoxy group in a side chain, and the reactive silicone oil is three-dimensionally meshed in the composition. Forming the structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a combination of a sliding member and a mating member. In particular, the present invention relates to a combination of a sliding member and a mating member, characterized in that the sliding surfaces of two members including a sliding member and a mating member that slide opposite to each other are made of synthetic resin.

[0002]

2. Description of the Related Art Sliding members, especially sliding members made of synthetic resin, include bearings, cams, gears, retainers, liners, etc., and sliding bearings used in construction or transmission of operating force used in vehicles such as vehicles. And cable conduits.

As a mating member for these sliding members, a metal member such as steel is generally used.

[0004] However, for various purposes or necessity, a sliding member characterized in that the mating member facing the synthetic resin sliding member or at least the sliding surface thereof is a synthetic resin, and which is characterized by a slip between the resin and the resin. There is also a combination mode of a combination with a counterpart member.

For example, a combination of a steel shaft coated with a synthetic resin and a synthetic resin bearing, a combination of gears made of a synthetic resin, a synthetic resin pipe and a push-pull or a rotary slide inserted therein. There are various types of control cables such as a combination of a wire rope coated with a synthetic resin.

The synthetic resins used include polyesters such as polyamide, polyoxymethylene, polyethylene, polypropylene, and polybutylene terephthalate;
Polyphenylene sulfide, polyurethane, fluororesin, phenolic resin and the like are the most versatile ones.

[0007] Among them, fluorine resin, especially ethylene tetrafluoride resin, is well known as a material having a low coefficient of friction, and is widely used as a sliding material in various forms.

In general, low friction materials have difficulty in abrasion resistance, and various measures have been taken to improve the abrasion resistance.

As for the tetrafluoroethylene resin, it is blended with other synthetic resin having excellent wear resistance, mixed with graphite or glass powder, deposited as a thin film on the back metal, and formed into a fiber form of the tetrafluoroethylene resin. For example, a method of forming a sliding surface by mixing or interweaving the above with other organic or inorganic fibers is employed.

[0010] Some of these modifying means can improve the abrasion resistance and mechanical strength, but in some cases slightly sacrifices the low friction characteristics inherent in the tetrafluoroethylene resin.

On the other hand, various devices have been devised for the mating member facing the synthetic resin sliding member.

When the mating member is a metal material such as steel,
The surface roughness is reduced as much as possible, hard chrome plating is applied, or surface treatment such as nitriding or sulfurizing is applied to facilitate the transfer of ethylene tetrafluoride resin to the mating material during sliding. Means have been adopted to microscopically expect or realize the slip between the tetrafluoroethylene resins and to reduce the friction coefficient.

For various purposes and necessities, that is, rust prevention, chemical resistance, electrical insulation, other weight reduction, noise reduction, and other design requirements, the mating member itself is made of synthetic resin or at least its slip surface is changed. Means such as a synthetic resin may be employed.

When the sliding surface is made of a combination of a synthetic resin and a synthetic resin, there are various problems.

For example, even with a tetrafluoroethylene resin known to have a low coefficient of friction, it is difficult to make the coefficient of static friction 0.1 or less in slip under dry friction conditions.

Even if various material modifications are made, the synthetic resin as the mating material is scrutinized, and the friction condition is limited to a low sliding speed region, it is almost impossible to make the static friction coefficient 0.08 or less. is there.

Therefore, when a lubricating oil can be applied,
It is extremely effective to interpose a lubricating oil such as mineral oil, synthetic lubricating oil or grease on the slip surface between the synthetic resins, and both the static friction coefficient and the dynamic friction coefficient can be reduced.

However, when the sliding surface is made of a combination of a synthetic resin and a synthetic resin, if the sliding surface is under a load and does not always operate, a long-term contact between the two members causes It is easy for the synthetic resin on the sliding surface to have microscopic settling, which breaks the lubricating film of the lubricating oil interposed in it or squeezes it out of the sliding system. Cause a situation that cannot be achieved.

For example, when the load is large and the sliding operation is not always performed, in the event of a fire or the like, a window or a fire door, which is opened and closed by a signal from a sensor in the event of a fire, or in response to an earthquake motion. In a sliding portion such as a bearing having a function of releasing a displacement of a structure by sliding, an accurate and effective low-friction sliding in an emergency cannot be obtained.

In general, even when the lubricating film of the lubricating oil interposed on the slip surface is squeezed out and is depleted or broken, for example, when an oil-containing sliding member is used, the lubricating film is repeatedly used. Lubricating oil is newly supplied to the sliding surface by this slip, or the lubricating film breakage part is self-repaired, and there is a case where there is no practical problem, but it is possible to have this slip repeatedly as in the applications described above. It may not be possible.

[0021]

SUMMARY OF THE INVENTION The present invention relates to a combination of a sliding member characterized by a slip between a synthetic resin and a synthetic resin, and a mating member. Another object of the present invention is to provide a member having a lubricating film that does not break. Further, it is an object of the present invention to provide a member capable of performing an accurate and effective low-friction sliding when a sliding is required.

Then, a combination of a sliding member and a mating member exhibiting such characteristics best is disclosed.

[0023]

SUMMARY OF THE INVENTION According to the present invention, of two members consisting of a sliding member and a mating member which slide in opposition to each other, at least one of the members has a self-lubricating surface. The first gist of the present invention is the result of intensive studies on the material composition of the other member and the form of the slip surface of the other member. It is composed of two members consisting of a moving member and a mating member, and one of the members or at least the sliding surface of the member is made of a synthetic resin having self-lubricating properties, and the sliding surface of the other member is at least epoxy. A reactive silicone oil having an epoxy equivalent of 1000 or less having an epoxy group in a side chain and comprising a coating film comprising a reactive silicone oil. Yl resides in the combination of the sliding member and the mating member which is characterized in that it forms a three-dimensional network in the composition.

A second aspect of the present invention is to provide a sliding member and a mating member which are opposed to each other and have a sliding surface which is self-lubricated. When preparing a combination consisting of a synthetic resin having a property, 100 parts by weight of an epoxy resin, 2 to 100 parts by weight of a reactive silicone oil having an epoxy group having an epoxy group in a side chain of 1000 or less, and an amine or acid anhydride are used. A solution obtained by dissolving a curing agent in an amount of 0.5 to 250 parts by weight in an organic solvent is applied to the surface of one member facing the sliding surface of the other member to form a coating film on the surface, and A method for producing a combination of a sliding member and a mating member, characterized in that a coating film is cured by heating to form a reactive silicone oil having an epoxy group into a three-dimensional network structure.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
First, of the two members composed of a sliding member and a mating member that slide in opposition to each other, a self-lubricating synthetic resin that forms one member or at least the sliding surface of the member will be described.

As the self-lubricating synthetic resin, a resin simple substance such as polyolefin, polyacetal, polybutylene terephthalate, polyphenylene sulfide, or a fluororesin, or a resin blended with a lubricating agent or a reinforcing agent can be used. Lubricating oils include lubricating oils,
Grease, wax, graphite, molybdenum disulfide, ethylene tetrafluoride resin, and the like, and examples of the reinforcing agent include glass powder, glass fiber, carbon powder, carbon fiber, and aramid fiber.

These self-lubricating synthetic resins can be used by embedding a block-shaped or plate-shaped molded product in a recess formed in a backing made of metal or the like, with a portion thereof protruding and embedding it in the surface of the backing. Various forms of application are adopted, such as using it by bonding or screwing, or using it by attaching it as a thin film on the surface of a backing material.

As this thin film type, a porous sintered layer of a copper alloy is provided on a steel plate, and a synthetic resin having a self-lubricating property is supplied on the sintered layer, and the resin is pressed and heated and fired. A multi-layer sliding member formed by applying a thin film, or a cured film of the above synthetic resin directly on the surface of a backing material such as steel, for example, a solvent dispersion type (trade name of ethylene tetrafluoride resin manufactured by Daikin Industries, Ltd.) Polyfluorocarbon (TFE enamel), followed by baking to form a cured film, and any of these can be used effectively.

Next, a composition comprising an epoxy resin and a reactive silicone oil having an epoxy group, which constitute a coating film on the sliding surface of the other member opposite to the one member, will be described.

As the epoxy resin used in the present invention, a commercially available epoxy resin can be used. For example, a liquid epoxy resin (trade name: Epicoat 828) manufactured by Yuka Shell Epoxy is one of the effectively used epoxy resins. One.

The reactive silicone oil having an epoxy group is obtained by substituting a part of the methyl group of dimethyl silicone oil or methylphenyl silicone oil with an organic group having an epoxy group, and having an epoxy group in a side chain. And an epoxy equivalent of 1000 or less, preferably 1
50-1000 silicone oils are used. For example, an epoxy-modified silicone oil (KF-101 (trade name) epoxy equivalent 350) manufactured by Shin-Etsu Chemical Co., Ltd. having an epoxy group introduced into a side chain of dimethyl silicone oil.
Is mentioned. The compounding amount is 2 to 100 parts by weight based on 100 parts by weight of the epoxy resin.

As the curing agent, those conventionally used as curing agents for epoxy resins can be used, and amine-based and acid anhydride-based curing agents are preferably used. As amine-based curing agents, aliphatic amines, alicyclic amines,
Aromatic amines and those obtained by modifying these are exemplified. For example, a modified aliphatic amine “Epicure T (trade name)”, a modified alicyclic amine “Epicure 113 (trade name)”, and a modified aromatic amine “Epicure W (trade name)” manufactured by Yuka Ciel Epoxy Co., Ltd. may be mentioned. . Examples of the acid anhydride-based curing agent include aliphatic, alicyclic, aromatic, and halogen-based curing agents. For example, "Epicure 134A" manufactured by Yuka Ciel Epoxy Co., Ltd. is used. The amount of the curing agent is 0.5 to 250 parts by weight based on 100 parts by weight of the epoxy resin, and the amount is determined by the epoxy equivalent of the epoxy resin and the epoxy-modified silicone oil.

The method for forming the deposited film will be described. After dissolving 100 parts by weight of an epoxy resin and 2 to 100 parts by weight of a reactive silicone oil having an epoxy group in an organic solvent, 0.5 to 250 parts by weight of a curing agent is dissolved, or 100 parts by weight of an epoxy resin is dissolved in an organic solvent. After dissolving, 2 to 100 parts by weight of the reactive silicone oil and 0.5 to 250 parts by weight of the curing agent were dissolved to prepare a solution having a solid content of 30% by weight. As the organic solvent, ketones such as methyl ethyl ketone and methyl isobutyl ketone and mixtures thereof with alcohols, aromatic hydrocarbon solvents such as toluene and xylene are preferably used.

This is applied to a steel surface which has been subjected to a generally-used treatment such as shot blasting and degreasing, and is naturally dried or dried at 80 ° C. for 30 minutes to remove the solvent.
Then, baking was performed at 180 ° C. for 30 minutes to obtain a solidified adhered film. The thickness of the deposited film was about 30 μm.

In the reactive silicone oil having an epoxy group, the epoxy functional groups in the silicone oil react with the curing of the epoxy resin in the above-described baking process to form a three-dimensional network structure in the composition. . It is considered that this three-dimensional network is formed not only between silicon but also with epoxy resin.

As described above, the reactive silicone oil having an epoxy group is completely incorporated by forming a three-dimensional network structure in the epoxy resin as the base resin, and imparts self-lubricating properties to the adhered film. Is done. The three-dimensional network structured silicone oil no longer exhibits an oil.

For example, the above-mentioned epoxy-modified silicone oil KF-101 (trade name) is 2,000
Although it is a viscous oil having a viscosity of 0 centistokes, it can be understood from the fact that when a curing agent is added thereto and heated, it becomes a jelly-like semi-solid with almost no stickiness. It is not oily but still retains lubricity.

In the above case, only a composition obtained by mixing a reactive silicone oil having an epoxy group with an epoxy resin has been described. However, when the two are mixed and stirred, a third substance such as a reinforcing filler is further added. It may be added. However, in a coating film forming process such as spraying, it is necessary that the material and the amount of addition do not impair workability.

In the present invention, a composition obtained by mixing a reactive silicone oil having an epoxy group with an epoxy resin is applied to a surface of a metal or the like by spraying or the like in a state diluted with a solvent. It was feared that the oil would have an adverse effect on the formation of the coating film, or that it would reduce the adhesive strength of the cured coating to the substrate.

However, as a result of various experiments, the mixing amount of the reactive silicone oil having an epoxy group was 2 to 100.
In the range of parts by weight, the adhesive strength of the cured film (the base metal was carbon steel S45C for machine structure, compressive shear strength kg
f / cm ² ) is 80 to 30 kgf / cm ²
Usually, in applications intended for this kind of sliding,
The above-mentioned adhesive strength exceeds the range in which there is no problem if it is 20 to 30 kgf / cm ² or more.

This is because the composition according to the present invention is applied to the substrate surface in a solvent-diluted state, and in the subsequent heating and curing process, the epoxy resin in the composition takes precedence over other components in the substrate interface. It is considered that the surface side, that is, the slip surface side becomes rich in silicone, and the adhesive layer is formed in this manner.

The primer treatment usually performed prior to the formation of the coating film is also effective in forming the coating film of the present invention.

In the present invention, the cured coating thickness is 30
It is preferred to be around μm. If the thickness is too thin, for example, if the thickness is 5 μm or less, the uniformity of the coating is impaired or the durability as a slip surface is affected.

On the other hand, if the thickness is too large, the mechanical strength of the coating will be impaired and the load resistance as a sliding material will not be affected.

Therefore, the coating thickness is 5 to 100 μm,
Especially 10 to 50 μm, most preferably 20 to 40
μm.

[0046]

【Example】

1. Sliding member (A) As glass fiber powder, “MF06JB1-2” manufactured by Asahi Fiber Glass Co., Ltd., having a diameter of 10 μm and an average length of 63 μm.
0 (trade name) 15% by weight, as polyimide resin powder, 2% by weight of "P84 (trade name)" manufactured by Lenzing Co., and the remainder from ethylene tetrafluoride resin "Teflon 7AJ (trade name)" manufactured by Du Pont-Mitsui Fluorochemicals Co., Ltd. Of a resin composition comprising: The end surface of a rod-shaped object having a diameter of 10 mm and a height of 14 mm was used as a slip surface. (B) A molded product of a resin composition comprising the polyimide resin powder 20% by weight and the balance of the above tetrafluoroethylene resin. The end surface of a rod-shaped object having a diameter of 10 mm and a height of 14 mm was used as a slip surface. (C) 15% by weight of Teflon 7AJ (trade name), a tetrafluoroethylene resin manufactured by Du Pont-Mitsui Fluorochemicals; Lubron L-5, a tetrafluoroethylene resin manufactured by Daikin Industries, Ltd.
(Trade name) 25% by weight, the balance being a molded article of a resin composition comprising polyphenylene sulfide “Topren PPST-4 (trade name)” manufactured by Topren Corporation. The end surface of a rod-shaped object having a diameter of 10 mm and a height of 14 mm was used as a slip surface. (D) A molded article of a resin composition comprising 5% by weight of mineral oil and the balance polyacetal “Duracon M90 (trade name)” manufactured by Polyplastics. The end surface of a rod-shaped object having a diameter of 10 mm and a height of 14 mm was used as a slip surface.

2. The mating member is a plate-shaped carbon steel for machine structure S45C having a width of 40 mm, a length of 280 mm, and a thickness of 10 mm as a backing material, and is subjected to shot blasting and degreasing treatment as shown in Table 1 (a) to (a).
(G) Spraying a mixed solvent diluent (solid content 30% by weight) of methyl isobutyl ketone and toluene of the composition comprising the components, spray drying at 80 ° C. for 30 minutes, and then drying at 180 ° C. for 30 minutes
Heat baking was performed for 30 minutes to give a coating thickness of 30 μm. In the table, the epoxy resin is “Epicoat 828 (trade name), epoxy equivalent: 190” manufactured by Yuka Shell Epoxy Co., and the silicone oils A and B are “KF” manufactured by Shin-Etsu Chemical Co., Ltd. each having an epoxy group in a side chain. -101 (trade name), epoxy equivalent 350 "," X-22-2000 (trade name),
Epoxy equivalent 650 "and a curing agent used were modified alicyclic amines" Epicure 113 (trade name) "manufactured by Yuka Shell Epoxy. The components used are given in parts by weight. (Below)

[0048]

[Table 1]

3. A pressurizing unit that can apply a load in the vertical direction by an air cylinder and a movable horizontal support that can push and pull in a horizontal mode in a predetermined mode by a servomotor are combined. A reciprocating motion tester that slides by pushing and pulling horizontally while applying pressure.・ Maximum vertical load 500kgf ・ Maximum horizontal stroke 30cm ・ Maximum horizontal speed 80cm / sec

4. Test method A sliding member with a diameter of 10 mm and a height of 14 mm
It was gripped over a length of 0 mm, and 4 mm of it was protruded downward and attached to the pressurizing section of the tester. On the other hand, a mating member was attached and fixed to the horizontal support base with a fastener. The test conditions are as follows, and FIG. 1 shows a model of the test speed waveform. (Test Conditions) Speed 1cm / sec~50cm / sec · load ^{100kgf / cm 2 ~400kgf / cm 2} · test stroke 220 mm, test speed waveform trapezoidal

5. Test Results Tables 2 and 3 show the dynamic friction coefficient when the sliding speed was fixed at 1 cm / sec and the load was changed in the range of 100 to 400 kgf / cm ² for each combination of the sliding member and the mating member. It is shown. When the amount of the reactive silicone oil having an epoxy group exceeds 2 parts by weight, the effect on the friction coefficient is remarkable. (Below)

[0052]

[Table 2] (Below)

[0053]

[Table 3]

Table 4 shows that the load was fixed at 200 kgf / cm ² for each combination of the sliding member and the mating member.
It shows the dynamic friction coefficient when the sliding speed is changed in the range of 10 to 50 cm / sec. (Below)

[0055]

[Table 4]

As the speed increases, the dynamic friction coefficient shows an upward rise. This is observed with the present invention example and the comparative example, but the tendency of the present invention example was slight. And the characteristic is that the value of the dynamic friction coefficient is extremely small.

FIG. 2 shows a load of 3 for the combination of Example Ab of the present invention and the combination of Comparative Example Ag.
The effect of the load holding time on the dynamic friction coefficient (μk) and the static friction coefficient (μs) is plotted under the conditions of 00 kgf / cm ² and a sliding speed of 1 cm / sec. The horizontal axis of the figure is represented on a logarithmic scale.

As can be seen from the figure, in the case of the present invention, the values of both μs and μk were small, and both were close to each other, and the change due to the holding time was extremely small.

In the case of the comparative example, the value of μs after the holding time of 10 hours is abnormally decreased, but the reason for this is not clear. However, the value of μs is 0.1
As described above, the difference between μs and μk is also large. This tends to cause stick-slip during sliding in the comparative example, which also causes sound. In the combination of the examples of the present invention, this does not occur at all.

In the above test results, no mention was made of wear, but the wear amount (mg) of the sliding member of the present invention was several tens of times the wear amount (mg) of the sliding member of the comparative example. It was extremely small, from one to one hundredth.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a model of a test speed waveform of a reciprocating motion testing machine used for a test of the present invention.

FIG. 2 is a graph showing test results.

[Explanation of symbols]

 μs Static friction coefficient μk Dynamic friction coefficient

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Claims (3)

[Claims] The sliding member comprises a sliding member and a mating member which slide in opposition to each other, and one of the members or at least the sliding surface of the member is formed of a self-lubricating synthetic resin. The slip surface of the other member is formed of at least a coating film of a composition comprising an epoxy resin and a reactive silicone oil having an epoxy group in a side chain and having an epoxy equivalent of 1,000 or less. Wherein a three-dimensional network structure is formed in the composition. 2. The composition of the deposited film is epoxy resin 100
Reactive silicone oil having a weight part and an epoxy group 2
To 100 parts by weight and an amine or acid anhydride curing agent
The combination according to claim 1, comprising 5 to 250 parts by weight. 3. A combination comprising a sliding member and a mating member which slide in opposition to each other, wherein one of the members or at least the sliding surface of the member is made of a synthetic resin having self-lubricating properties. In preparing, a reactive silicone oil having 100 parts by weight of epoxy resin and an epoxy equivalent having an epoxy group in a side chain of 1000 or less 2 to 100.
Parts by weight and 0.5 to 25 amine or acid anhydride curing agent
A solution obtained by dissolving 0 parts by weight in an organic solvent is applied to the surface of one member facing the sliding surface of the other member to form a coating film on the surface, and the coating film is cured by heating. A method for producing a combination of a sliding member and a mating member, characterized in that a reactive silicone oil having an epoxy group is formed into a three-dimensional network structure by using the above method.