JPH0354297A - Lubricating composition - Google Patents

Abstract

PURPOSE:To make a lubricating compsn. exhibit excellent wearing properties to not only a hard material but also a soft material and useful for a bearing used at high temp. by incorporating a fluororesin and led fluoride as the essential components in a polyphenylene sulfide resin. CONSTITUTION:5-40 wt.% fluororesin (e.g. Teflon 7J manufactured by Mitsui Du Pont Fluorochemicals Co., Ltd.) and 5-45 wt.% lead fluoride (B) are incorpo rated in a polyphenylene sulfide resin (e.g. PPS 160 manufactured by Toso Susteel Co., Ltd.) to prepare a lubricating compsn. suitable for a heat-resistant synthetic resin bearing, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lubricious material whose main component is polyphenylene sulfide resin, which is used as a material for various sliding parts. [Prior Art] In recent years, as the field of application of Hewei resin sliding bearings has expanded, it has become necessary to improve Ig! There has been a strong demand for heat-resistant synthetic resin bearings that exhibit good friction and wear characteristics. In addition, aluminum ξ alloy A is also inexpensive as a mating material for bearings.
5056, etc., and the bearings are required to have characteristics that will not damage the mating material during use. It is well known that polyphenylene sulfide (abbreviated as PPS) resin has been used as a thermoplastic synthetic resin with good heat resistance and mechanical strength. However, this PPS resin has poor self-lubricating properties, so when using it as a material for parts that require lubricity,
It is necessary to add a lubricant to provide lubricity, and for example, composite materials using graphite, tetrafluoroethylene resin, lubricating oil, metal oxides, aromatic boria resin, etc. have been developed. However, such composite materials are subject to high temperatures,
This cannot be said to be sufficient in terms of exhibiting very good friction and wear characteristics under high load conditions. Also, PPS
Composite materials using composite resin powders that are more heat resistant than tetrafluoroethylene resins and PPS resins have also been developed, but when the mating material is a hard material, they exhibit good friction and wear characteristics. If the mating material is an aluminum alloy, it will damage the mating material. On the other hand, a composite material containing carbon fibers initially exhibits good Wl friction and wear properties, but even if the mating material is hard, it damages the mating material, and as the material is damaged, the friction and wear properties rapidly deteriorate.

(Problem to be solved by the invention) As described above, there is a problem in the conventional technology that there is no heat-resistant material with good lubrication properties and it is not possible to meet the demands of the world. This was an issue. [Means to solve the problem] E! II! ! In order to solve the problem, this invention
5-40% by weight of fluororesin and 5-4% of lead fluoride in S resin
5% by weight was added as an essential component to form a lubricating composition, and the details thereof will be described below.

First, the PPS resin in this invention is a hewei resin represented by the general formula 11i1ko1S→ko. Here, one Ph in the formula and Q is FSC! , Br or Cllff, and m represents an integer of 1 to 4. Among these, it is commercially available from Philimbus Vetroleum Company of the United States under the trademark R Ryton J, and its manufacturing method is described in U.S. Pat.
- 3368). According to it, Ryton has a concentration of 160 to 250 in N-methylpyrrolidone solvent.
It is produced by reacting p-dichlorobenzene and sodium disulfide under pressure at ℃, and has various degrees of polymerization ranging from no cross-linking to partial cross-linking in the resin. Since it is possible to freely manufacture materials by subjecting them to a post-heat treatment process, it is possible to arbitrarily select and use materials with appropriate melt viscosity characteristics for the desired solvent blend. In addition, it is also possible to use a straight-shaped material without a cross-linked structure. In addition, the fluororesin in this invention includes tetrafluoroethylene resin, ethylene-tetrafluoroethylene copolymer, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene-hexafluoropropylene copolymer, polytrichlorofluoroethylene Examples include ethylene, but tetrafluoroethylene citrus is particularly preferred. Tetrafluoroethylene resin is a polymer of tetrafluoroethylene, and may be a powder for formal use or a fine powder for so-called solid lubricants, such as Mitsui DuPont Fluoroque. Manufactured by Mocal: Teflon 7J
, TLP-10, manufactured by Asahi Glass Co., Ltd.: Fluon G163, manufactured by Daikin Industries, Ltd.: Boliflon M15, LeBlon Shi 5, etc. Further, the lead fluoride in this invention is PbFt, PbF. It is expressed by a chemical formula such as, and is preferably in powder form. In this invention, the reason why the amount of fluororesin is limited to 5 to 40% by weight is that if it is less than 5% by weight, the lubricating properties will be poor, and if it exceeds 40% by weight, the moldability will be significantly impaired. Further, the reason why the amount of lead fluoride is limited to 5 to 45% by weight is that outside this range, the lubricating properties are poor.

Here, the method of mixing each additive with a fixed blending ratio is not particularly limited, and any commonly used method may be used, such as mixing the main component resin and other raw materials individually, or Henschel After dry mixing as appropriate using a mixer such as a mixer, ball mill, tumbler mixer, etc., it is fed to an injection molding machine or melt extrusion molding machine with good melt-mixing properties, or it is mixed in advance using a hot roll, kneader, etc.
Methods such as melt mixing using a Banbury ξ mixer, melt extruder, etc. may be used. Furthermore, the method for shaping the composition of the present invention is not particularly limited, and conventional methods such as compression molding, extrusion molding, injection molding, etc., or melting and mixing of the composition. After that, the powder is pulverized using a jet mill, freezing pulverizer, etc., and then classified to the desired particle size, or without being classified, the resulting powder is subjected to fluidized dip coating, electrostatic powder coating, etc. It is also possible to do so. It is also possible to disperse the obtained powder in a solvent and perform spray coating or dip coating.

It should be noted that various additives may be added to the lubricating compound of the present invention, which mainly contains PPS resin, within the range that does not deteriorate the lubricating properties. In addition, various wear resistance improvers may be added to further improve the lubricity. Preferred examples of such wear resistance modifiers include, but are not limited to, aromatic polyamide fibers, graphite, and aromatic polyester resins. [Function] The above-mentioned fflbi product of the present invention forms a good transfer film on the mating material by using fluororesin and lead fluoride as essential precepts, and can be used without damaging even if the mating material is an aluminum alloy. , exhibits good lubrication properties. [Example] First, the raw materials used in the Examples and Comparative Examples are listed below. The proportion of each precept is as follows:
All percentages are by weight. ■ PPS resin (manufactured by Tososa Steel Co., Ltd.: PPS#1
60), ■ pps resin (manufactured by Kureha Chemical Co., Ltd.: KPS-W205
), ■ Lead fluoride PbF (manufactured by Wako Pure Chemical Industries, Ltd.: lead fluoride powder), ■ Aromatic polyamide fiber (manufactured by Teijin Co., Ltd.: Conex Fiber Ikaku, ■ Tetrafluoroethylene resin (Mitsui DuPont Fluorochemical) manufactured by Teflonma J), ■ Ethylene-tetrafluoroethylene copolymer ([!
TFE resin] (Asahi Glass Co., Ltd.: Aflon COPZ882
0) ■ Aromatic polyester resin (manufactured by Sumitomo Chemical Co., Ltd.:
Econor [! IOIM) ■ Carbon fiber (manufactured by Toray Industries: trading card card D-30) ■ Carbon black (manufactured by Lion Corporation: Ke, Chen [!C-X)
, [Phase] Talc, 0 Calcium fluoride (manufactured by Shiraishi Calcium Co., Ltd.: Fluoride Power! Resium-OP), Examples I to 4: Various raw materials were blended in the proportions shown in Table 1. In order to form the kumiyimono, first, the raw materials are thoroughly mixed in a Henschel mixer, fed to a two-wheel melt extruder, and extruded under melt mixing conditions at a cylinder temperature of 300'C and a rotation speed of 100 revolutions per minute. Granulate the resulting beleft at a resin temperature of 310
'C, a ring-shaped test piece with an outer diameter of 23 m, an inner diameter of 14 m, and a length of 13 rods was formed under the injection conditions of an injection pressure of 800 kg/cd and a mold temperature of 130°C, and the volume resistance was determined using this test piece. We conducted measurements of friction and wear tests. Also, the coefficient of friction is the sliding speed of 100-min, the load fr 1 kg/c
Measured using a thrust type friction tester under the conditions of -d, the wear coefficient was 128 m/min at a sliding speed of 3.9 kg/Cd.
The wear resistance was determined using a thrust type wear tester under the following conditions, and in both cases, bearing w4su Table 1 Table 2 Table J-2 (quenched, ground finish) was used as the mating material. The wear coefficient was also measured using an aluminum base metal A5056.
The results obtained are summarized in Table 2. The degree of damage to the mating material was examined after the wear test, and the results are also listed in Table 2.
The degree of damage was expressed in two stages: no damage (○ mark) and damage (x mark).

Comparative Examples 1 to 3: Test pieces were made in the same manner as in Example 1 except that the raw materials were mixed in the proportions shown in Table 1, various properties were determined, and the obtained results were also listed in Table 2. ．． From the results shown in Table 2, Comparative Example 1 shows good lubrication properties with SUJ2 mating material, but A5056 material damages the mating material and wears itself, and Comparative Example 2 shows good lubrication properties with SUJ2 mating material. However, even SUJ2 was damaged,
In the 5056 mating material, the damage to the mating material was even more significant.Furthermore, in Comparative Example 3, although the same fluoride was added, there was no damage to the mating material, but the wear characteristics were poor.
It has become clear that it is not possible to obtain a composite material such as No. 4, which has a small wear coefficient and does not cause damage to the mating material, even with an aluminum alloy mating material. [Effects] As described above, the shaped body obtained from the composite material of the present invention has excellent wear resistance not only when mating with hard materials such as iron-based materials, but also with soft materials such as aluminum alloys. Moreover, it does not damage the mating material, so it can be used as a bearing material regardless of the mating material. In addition, by utilizing the heat resistance of PPS resin, it can be said to be ideal for applications that require wear resistance against soft materials at high temperatures. In addition, since injection molding is also possible, it is easy to form a precept, so this invention can be said to be extremely significant.

Claims (1)

[Claims] (1) A lubricating composition characterized in that 5 to 40% by weight of a fluororesin and 5 to 45% by weight of lead fluoride are added to a polyphenylene sulfide resin as essential components.