JP2945382B2 - Plain bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding bearing composed of a lubricating resin composition containing a polyphenylene sulfide resin as a main component, which is used as various sliding portion materials.

[0002]

2. Description of the Related Art In recent years, as the field of application of synthetic resin plain bearings has expanded, heat-resistant synthetic resin bearings that exhibit good friction and wear characteristics under bearing operating conditions, especially in a high-temperature atmosphere, have become stronger. It has come to be desired.

Hitherto, polyphenylene sulfide (P) has been used as a thermoplastic synthetic resin having good heat resistance and excellent mechanical strength.
It is well known that a resin is used. However, since this PPS resin has poor self-lubricating properties, when it is used as a material for a portion requiring lubricating properties, it must be added with a lubricant or the like to separately impart lubricating properties. Although composite materials using fluorinated ethylene resin, lubricating oil, metal oxide, aromatic polyamide resin, etc. have been developed, such composite materials have good friction and wear characteristics under high temperature and high load conditions. It is far from sufficient in showing that

[0004] On the other hand, a composite material containing carbon fiber shows good friction and wear properties at an early stage, but damages a mating material, and the friction and wear properties deteriorate rapidly with the damage.

[0005]

As described above, in the prior art, a heat-resistant material having good lubricating properties and
A heat-resistant composite that exhibits good friction and wear properties
There is a problem that there is no resin sliding bearing, and it is impossible to cope with the demands of the public, and it has been a problem to solve this.

[0006]

In order to solve the above-mentioned problems, the present invention comprises a PPS resin as a main component, 5 to 40% by weight of an ethylene tetrafluoride resin and 3 to 2 of a molten fluororesin.
Lubricant resin composition containing 0% by weight as an essential component
And a means for forming a plain bearing comprising the following.

First, the PPS resin in the present invention is a synthetic resin represented by the following general formula ( 2 ).

[0008]

Embedded image

In the formula, -Ph- is represented by the following chemical formula 3 , and Q is a halogen of F, Cl, Br or CH _3.
And m represents an integer of 1 to 4.

[0010]

Embedded image

Of these, particularly typical ones are as follows:
Of 4 are those represented by, commercially available under the trademark "Ryton" US Phillips Petroleum Co., a manufacturing method No. 3,354,129 (corresponding Japanese Patent Japanese Patent Publication 45-
No. 3368). According to the report, Ryton is produced by reacting p-dichlorobenzene and sodium disulfide in N-methylpyrrolidone solvent at 160 to 250 ° C. under pressure, and there is no cross-linking in the resin. Can be freely manufactured through post-heat treatment process from those with various degrees of polymerization to those with partial cross-linking. Is possible. Further, a linear PPS resin other than the Ryton, which does not have a crosslinked structure, can also be used.

[0012]

Embedded image

Further, the ethylene tetrafluoride resin in the present invention is a polymer of ethylene tetrafluoride, and may be a molding powder or a fine powder for a so-called solid lubricant. For example, Mitsui-Dupont Fluorochemicals: Teflon 7J, TLP-10, Asahi Glass: Fluon G16
3. Daikin Industries: Polyflon M15, Lubron L5 and the like.

Further, the molten fluororesin of the present invention comprises a tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (abbreviated as PFA), a tetrafluoroethylene-hexafluoropropylene copolymer (abbreviated as FEP), ethylene- Tetrafluoroethylene copolymer (ET
FE), tetrafluoroethylene-fluoroalkylvinylether-fluoroolefin copolymer (E
PE), polytrichlorofluoroethylene, polyvinylidene fluoride, etc.
PFA, FEP, ETFE, EPE each alone or a mixture thereof is particularly preferred. Specifically, for example, PFA is manufactured by Du Pont-Mitsui Fluorochemicals: Teflon PFA-J
, MP-10, Hoechst: Hostaflon TFA, Daikin Industries: Neoflon PFA, FEP: Mitsui / Dupont Fluorochemicals: Teflon FEP-J, Daikin Industries: Neoflon FEP, ETFE: Mitsui Dupont Fluorochemicals: Tefzel; Asahi Glass: Aflon COP; and EPE: Mitsui-Dupont Fluorochemicals: Teflon EPE-J.

In the present invention, the reason why the amount of the ethylene tetrafluoride resin is limited to 5 to 40% by weight is that if the amount is less than 5% by weight, the lubricating properties are poor, and if it exceeds 40% by weight, the moldability is remarkably reduced. The reason for further limiting the amount of the molten fluororesin to 3 to 20% by weight is that if the amount is less than 3% by weight, the lubricating properties are poor, and if it exceeds 20% by weight, the melt viscosity increases and the moldability increases. Is deteriorated and the mechanical strength is lowered, which is not preferable.

Here, the method of mixing the additives having a fixed blending ratio is not particularly limited, and a method generally used widely, for example, a resin as a main component and other various raw materials are individually Or Henschel mixer,
After appropriate dry mixing with a mixer such as a ball mill or tumbler mixer, supply it to an injection molding machine or melt extrusion molding machine with good melt mixing properties, or melt it in advance with a hot roll, kneader, Banbury mixer, melt extruder, etc. A method such as mixing may be used.

Further, in molding the composition of the present invention, the method is not particularly limited, and ordinary methods such as compression molding, extrusion molding and injection molding may be employed.
Both are possible.

Various additives can be added to the lubricating composition containing the PPS resin of the present invention as a main component within a range that does not deteriorate the lubricating properties.

[0019]

[Acting] lubricative resin composition above mentioned present invention Tona
Sliding bearings have an essential component of tetrafluoroethylene resin,
Good lubricating properties are exhibited by the combined use of the molten fluororesin and, at the same time, the counterpart material is not damaged because no hard material is added.

[0020]

EXAMPLES First, the raw materials used in the examples and comparative examples are collectively shown as follows. The mixing ratio of each component is all% by weight.

PPS resin (Tosoh Sosa Steel: PPS # 160) PPS resin (KPS-W205, Kureha Chemical Co.) ETFE (Asahi Glass Co., Ltd .: Aflon COP Z-8820) Molten fluororesin PFA (Mitsui DuPont) Fluorochemicals: MP-10) Ethylene tetrafluoride resin (Dupont Mitsui Fluorochemicals: Teflon 7J) Aromatic polyamide fiber (Teijin: 1 mm Conex fiber) Carbon fiber (Toray: Torayca MLD- 30) Talc carbon black (Lion: Ketjen EC-X)

[0022]

[Table 1]

Examples 1-4: Various raw materials were blended at the ratios shown in Table 1. In molding the composition, first, the raw materials are thoroughly mixed with a Henschel mixer, supplied to a twin-screw extruder, and extruded under a melt mixing condition of a cylinder temperature of 300 ° C. and a rotation speed of 100 revolutions per minute, and granulated. Under the injection molding conditions of a resin temperature of 310 ° C., an injection pressure of 800 kg / cm ² , and a mold temperature of 130 ° C., the obtained pellets have an outer diameter of 23 mm, an inner diameter of 14 mm, and a length of 13 mm.
Was molded, and the volume resistivity was measured and the friction and wear test was performed using this test piece. The coefficient of friction was measured using a thrust-type friction tester at a sliding speed of 100 m / min and a load of 1 kg / cm ² , and the wear coefficient was measured at a slip speed of 128 m / min and a load of 3.9 kg / cm ² . A thrust-type abrasion tester was used, and in all cases, bearing steel SUJ-2 (hardened and ground) was used as a mating material. The results obtained are summarized in Table 2.

[0024]

[Table 2]

After the abrasion test, the degree of damage of the mating member was examined, and the results are shown in Table 2. The degree of damage was represented by a two-step evaluation of not damaging (marked by ○) and damaging (marked by ×).

Comparative Examples 1-4: Test pieces were prepared in exactly the same manner as in Example 1 except that the raw materials were blended in the proportions shown in Table 1, and various properties were obtained. The obtained results are also shown in Table 2. did.

From the results shown in Table 2, in Comparative Examples 1 and 2, the wear coefficient was high, and in Comparative Example 4, although the lubricating properties were good, the mating material was damaged, and as in Examples 1 to 4, It was found that a composition having a small wear coefficient and not damaging the mating material could not be obtained. In Comparative Example 3, the melt viscosity of the composition was extremely high, and molding was not possible.

[0028]

As described above, the lubricating tree of the present invention
The sliding bearing , which is a molded product obtained from the oil composition, has excellent abrasion resistance and does not damage the mating material unlike the carbon fiber compound material, and therefore utilizes the heat resistance of the PPS resin. Thus, it can be said that it is a good one as a synthetic resin sliding bearing used at a high temperature.

A sliding bearing comprising a lubricating resin composition
Since injection molding is also possible and molding is easy,
The significance of the present invention can be said to be extremely large.

Claims (7)

(57) [Claims] The method according to claim 1 Polyphenylene sulfide resin main component
And 5 to 40% by weight of a tetrafluoroethylene resin and 3 to 20% by weight of a molten fluororesin were added as essential components.
A sliding bearing comprising a lubricating resin composition . 2. The slide bearing according to claim 1, wherein the slide bearing is a molded article formed by injection molding. 3. The sliding bearing according to claim 1, wherein the molten fluororesin is an ethylene-tetrafluoroethylene copolymer. 4. The sliding bearing according to claim 1, wherein the polyphenylene sulfide resin is a polyphenylene sulfide resin having a structure represented by the following formula (1). Embedded image 5. The sliding bearing according to claim 1, wherein the polyphenylene sulfide resin is a polyphenylene sulfide resin having a partial cross-link. 6. A lubricating resin composition comprising a polyphenylene sulfide resin as a main component, 5 to 40% by weight of an ethylene tetrafluoride resin and 3 to 20% by weight of a molten fluororesin as essential components, and an aromatic polyamide fiber added thereto. Sliding bearings made of material. 7. The sliding bearing according to claim 1, wherein the sliding bearing comprises a lubricating resin composition having a wear coefficient of less than 80 × 10 ⁻¹⁰ cm ³ / kg · m measured under the following sliding conditions. A sliding bearing according to any of the above. Using a thrust type abrasion tester, outer diameter 23 mm, inner diameter 14
mm, 13 mm long ring-shaped test piece for bearing steel S
A mating material made of UJ-2 (hardened, ground finish) is brought into sliding contact with it, sliding speed: 128 m / min, load: 3.9 kg / c
It is a wear coefficient measured under a sliding condition of m ² .