JPH09286915A - Vane motor blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain vane motor blades subject to no output drop even under non-lubricated operation, and useful for air tools, consisting of a resin composition molding predominant in a polyimide-based resin. SOLUTION: This vane motor blades are made of a resin composition essentially comprising (A) 100 pts.wt. of a polyimide-based resin [pref. a thermoplastic polyimide-based resin of the formula (X is a direct bond, CH2 , CH2 CH2 , etc.; R1 to R4 are each H, methyl, Cl or Br; Y is a tetravalent group such as =C=C=)], (B) 10-160 pts.wt. of graphite and (C) 2-40 pts.wt. of a fluororesin (pref. perfluororesin or tetrafluoroethylene resin), and pref. containing (D) 5-25 pts.wt. of reinforcing fibers and (E) 1-10 pts.wt. of a thermotropic liquid crystal polymer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vane motor blade using compressed air as a power source, and more particularly to a vane motor blade for an air tool whose output does not decrease even during operation without oil supply.

[0002]

2. Description of the Related Art In general, as a molding material for vanes of vane motors which use compressed air as a power source, particularly air tool vanes used for coating guns, air drivers, impact wrenches, air grinders, etc., cotton cloth is used as a base material. Phenolic resin laminates are used.

The above-mentioned vane motor is a well-known pneumatic motor of the type having a (vane) in contact with the casing inside the rotor and rotating the rotor by the air flowing between the vanes.

[0004]

However, since the vane motor blades using the above materials rotate with their edges in contact with the casing, it is necessary to maintain a good sliding condition between these parts. is there. Normally, lubricating oil is mixed with compressed air to reduce the coefficient of friction of the sliding parts of the vane motor, and the motor is made to have durability. It has a drawback that the output is reduced and seizure and delamination occur.

Further, in order to supply oil to the compressed air, it is necessary to provide an oil supply tank in the air line for delivering the air flow, and to perform maintenance to replenish the lubricating oil on a regular basis, and to use the air containing oil from the vane pump. Is discharged,
There are many problems such as the working environment using the air tool deteriorates, the clothes and body of the worker are contaminated with oil, and the use in the assembly line and the painting line in the clean room of electronic devices is limited. there were.

Further, since the phenolic resin laminated plate is machined on the entire surface, there is a problem that the dimensional variation is large.

Therefore, the object of the present invention is to solve the above problems, to provide vane blades of a vane motor which can be practically used as a power source of oil-free compressed air, and have been used under such conditions. In this case, the vane motor blade has excellent wear resistance and fatigue resistance.

[0008]

In order to solve the above problems, in the present invention, a vane motor blade is formed of a molded product of a resin composition containing a polyimide resin as a main component.

Alternatively, 10 to 160 parts by weight of graphite and 2 parts by weight of fluororesin based on 100 parts by weight of polyimide resin.
The blade of the vane motor is formed of a molded body of a resin composition containing 40 parts by weight as an essential component.

Alternatively, 100 parts by weight of polyimide resin,
The vane motor blade was formed of a molded product of a resin composition containing 10 to 160 parts by weight of graphite, 2 to 40 parts by weight of a fluororesin, and 5 to 35 parts by weight of reinforcing fibers as essential components.

Alternatively, with respect to 100 parts by weight of the polyimide resin, 10 to 160 parts by weight of graphite and 2 to 4 of fluorine resin.
The vane motor blade was made of a molded product of a resin composition containing 0 parts by weight, 5 to 35 parts by weight of reinforcing fiber, and 1 to 10 parts by weight of thermotropic liquid crystal polymer.

The above-mentioned polyimide resin has the following chemical formula 2.
The vane of the vane motor, which is a thermoplastic polyimide resin represented by the following formula, is preferable.

[0013]

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Further, the above-mentioned fluororesin is a perfluoro fluororesin, and particularly preferably tetrafluoroethylene resin.

The vane blade of the vane motor, which is made of a molded product of a resin composition containing the above-mentioned thermoplastic polyimide resin, reinforcing fibers and a solid lubricant, can maintain its lubricity without supplying the driving air. This is possible, and wear resistance and fatigue resistance are maintained even under oil-free operation, enabling stable operation for a long period of time.

Further, since the vane motor blades made of the above-mentioned materials are used, the dimensional stability of the vane motor blades during injection molding is improved, and the vane motor blades are precisely molded.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The polyimide resin of the present invention is obtained by dehydrating and cyclizing a polyamic acid obtained by reacting an ether diamine represented by the following chemical formula 3 with one or more tetracarboxylic dianhydrides. .

[0018]

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As a typical example in which R _{1 to} R ₄ are all hydrogen atoms in Chemical formula 3, Mitsui Toatsu Chemical Co., Ltd.
The polyimide resin marketed under the trade name of "M" is mentioned. Such a polyimide resin is disclosed in JP-A-61-114.
It is disclosed in Japanese Patent No. 3478, Japanese Patent Laid-Open No. 62-68817 and Japanese Patent Laid-Open No. 62-86021.

Since this polyimide resin exhibits thermoplasticity while maintaining the heat resistance inherent to the polyimide resin, it can be relatively easily molded by compression molding, injection molding, extrusion molding or other melt molding methods.

The following are specific examples of the diamine represented by the formula (3). That is, bis [4- (3-aminophenoxy) phenyl] methane,
1,1-bis [4- (3-aminophenoxy) phenyl] ethane, 1,2-bis [4- (3-aminophenoxy) phenyl] ethane, 2,2-bis [4- (3-aminophenoxy) Phenyl] propane, 2,2-bis [4
-(3-aminophenoxy) phenyl] butane, 2-
[4- (3-aminophenoxy) phenyl] -2- [4
-(3-Aminophenoxy) -3-methylphenyl] propane, 2,2-bis [4- (3-aminophenoxy)
-3-methylphenyl] propane, 2- [4- (3-aminophenoxy) phenyl] -2- [4- (3-aminophenoxy) -3,5-dimethylphenyl] propane,
2,2-bis [4- (3-aminophenoxy) -3,5
-Dimethylphenyl] propane, 2,2-bis [4-
(3-Aminophenoxy) phenyl-1,1,1,3,
3,3-hexafluoropropane, 4,4'-bis (3
-Aminophenoxy) biphenyl, 4,4'-bis (3
-Aminophenoxy) -3-methylbiphenyl, 4,4
′ -Bis (3-aminophenoxy) -3,3′-dimethylbiphenyl, 4,4′-bis (3-aminophenoxy) -3,5-dimethylbiphenyl, 4,4′-bis (3-aminophenoxy) -3,3 ', 5,5' tetramethylbiphenyl, bis [4- (3-aminophenoxy) phenyl] ketone, bis [4- (3-aminophenoxy) phenyl] sulfide, bis [4- (3-amino) Examples thereof include phenoxy) phenyl] sulfone and bis [4- (3-aminophenoxy) phenyl] ether. These can be used alone or in combination of two or more.

Further, other diamines can be mixed and used within a range that does not impair the melt fluidity of the above-mentioned polyimide resin. Examples of diamines that can be mixed and used include m-aminobenzylamine, p-aminobenzylamine, 3,3'-diaminodiphenyl ether, 3,4'-diaminodiphenyl ether, 4,4.
′ -Diaminodiphenyl ether, 3,3′-diaminodiphenyl sulfide, 3,4′-diaminodiphenyl sulfide, 4,4′-diaminodiphenyl sulfide, 3,3′-diaminodiphenyl sulfone, 3,4 ′
-Diaminodiphenyl sulfone, 4,4'-diaminodiphenyl sulfone, 3,3'-diaminobenzophenone, 3,4'-diaminobenzophenone, 4,4'-diaminobenzophenone, 1,3-bis (3-aminophenoxy) benzene , 1,3-bis (4-aminophenoxy) benzene, 1,4-bis (3-aminophenoxy)
Benzene, 1,4-bis (4-aminophenoxy) benzene, 2,2-bis [4- (4-aminophenoxy) phenyl] propane, 4,4′-bis (4-aminophenoxy) biphenyl, 4,4 ′ -Bis (4-aminophenoxy) ketone, bis [4- (4-aminophenoxy) phenyl] sulfide, bis [4- (4-aminophenoxy) phenyl] sulfone and the like can be mentioned, and these diamines are usually 30 mol. % Or less, preferably 5 mol% or less may be mixed and used.

The polyimide resin particularly preferably used in the present invention is obtained by dehydrating and ring-closing polyamic acid obtained by reacting the above-mentioned diamine and tetracarboxylic acid dianhydride in an organic solvent. The tetracarboxylic dianhydride used in this method is represented by the following chemical formula (4)
Is the same as in the case of Chemical Formula 2).

[0024]

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Specific examples of the tetracarboxylic dianhydride include the following. That is, ethylenetetracarboxylic dianhydride, 1,2,3,4-butanetetracarboxylic dianhydride, cyclopentanecarboxylic dianhydride, pyromellitic dianhydride, 3,3 ′, 4,4 ′ -Benzophenone tetracarboxylic dianhydride, 2,2 ',
3,3′-benzophenone tetracarboxylic acid dianhydride,
3,3 ', 4,4'-biphenyltetracarboxylic dianhydride, 2,2', 3,3'-biphenyltetracarboxylic dianhydride, bis (3,4-dicarboxyphenyl) ether dianhydride , Bis (3,4-dicarboxyphenyl) sulfone dianhydride, 1,1-bis (2,3-dicarboxyphenyl) ethane dianhydride, bis (2,3-dicarboxyphenyl) methane dianhydride, Bis (3,4-dicarboxyphenyl) methane dianhydride, 2,3,6,7
-Naphthalene tetracarboxylic dianhydride, 1,4,5,
8-naphthalenetetracarboxylic dianhydride, 1,2,
5,6-naphthalenetetracarboxylic dianhydride, 1,
2,3,4-benzenetetracarboxylic dianhydride, 3,
4,9,10-berylenetetracarboxylic dianhydride,
2,3,6,7-anthracene tetracarboxylic dianhydride, 1,2,7,8-phenanthrene tetracarboxylic dianhydride, 4,4 ′-(p-phenylenedioxy) diphthalic dianhydride, 4,4 '-(m-phenylenedioxy) diphthalic acid dianhydride and the like can be mentioned. These tetracarboxylic dianhydrides can be used alone or in combination of two or more. Further, in producing the above-mentioned polyimide resin, even a polyamide resin having a molecular terminal blocked by reacting in the presence of an aromatic dicarboxylic acid anhydride such as phthalic anhydride or an aromatic monoamine such as aniline It can be used.

The symbols n, X, and
The conditions for Y, R ₁ , R ₂ , R ₃ , and R ₄ may be as follows. That is, n represents an integer, X represents a group selected from the group consisting of a hydrocarbon group having 1 to 10 carbon atoms, a hexafluorinated isopropylidene group, a carbonyl group, a thio group and a sulfone group, R _{1 to} R ₄ represent hydrogen, a lower alkyl group, a lower alkoxy group, chlorine or bromine, and may be the same as or different from each other. Further, Y is an aliphatic group having 2 or more carbon atoms, a cycloaliphatic group, a monocyclic aromatic group, a condensed polycyclic aromatic group, or a non-bonded group in which aromatic groups are directly or crosslinked with each other. It represents a tetravalent group selected from the group consisting of condensed polycyclic aromatic groups. Here, the lower alkyl group and the lower alkoxy group may be each group having 1 to 5 carbon atoms.

In the present invention, graphite and fluororesin are used. The above graphite has a fixed carbon content of 9
It is 5% or more, preferably 97 to 100%. As the graphite, natural graphite or artificial graphite produced from the ground is used. Of the above natural graphite, the average particle size is about 5
Experiments have shown that flake graphite having a size of about -15 μm, preferably about 8-12 μm, more preferably about 10 ± 1 μm is particularly preferable for achieving the initial object of the present invention. The scale-like graphite is manufactured by Nippon Graphite Co., Ltd .: A
CP (fixed carbon 99.5%), Lonza Co .: KS-6 or KS-10 (fixed carbon 99.5%), etc. can be illustrated.

The artificial graphite is preferably, for example, one in which coke derived from pitch is solidified with tar or pitch and baked at 1200 ° C. and then placed in a graphitizing furnace to grow crystals at a high temperature of about 2300 ° C. The types of artificial graphite include pitch, coal tar, coke, wood raw materials, furan resin,
Thermosetting resins such as polyacrylonitrile, phenol, and epoxy can be used.

Here, the fixed carbon in the graphite component is the remaining component obtained by quantitatively removing water, ash and volatile matter in the industrial analysis of the coal test method, and a small amount of hydrogen containing carbon as the main component, It contains oxygen and nitrogen. When the fixed carbon amount is less than 95%, satisfactory results cannot be obtained for both the wear resistance and the shrinkage rate of the molded product before and after the crystallization treatment.

Specifically, vitreous graphite, which is an example of artificial graphite, is a vitreous graphite having no specific crystal structure obtained by carbonizing and firing a thermosetting synthetic resin such as phenol resin or furan resin. Carbon (amorphous,
That is, it is amorphous and has the same hardness (viscosity) as that of solid carbon, and normally powdery one is used.

As the commercially available glassy graphite made from phenol resin powder, phenol-formaldehyde having a methylol group in the molecule and having a weight average molecular weight of 3,000 or more, preferably 5,000 or more, more preferably 10 ⁴ to 10 ⁷ is used. Resin at 500-3000 ° C, preferably 8
There are those obtained by baking (heat treatment) at 00 to 2000 ° C (Bellpearl C-800 manufactured by Kanebo Co., Ltd., Bellpearl C-2000 manufactured by the same company), and these have an average particle size of 1 to 3.
0 μm, preferably 3 to 20 μm, more preferably 5 to
It is possible to use a fine particle adjusted to 15 μm. It should be noted that glassy graphite having a high molecular weight is carbonized, and the higher the heat treatment temperature, the closer to the structure of graphite is obtained.

More specifically, the glassy graphite has a disordered structure having an extremely small crystal size as a basic structure and has a non-oriented structure as a fine structure. Phenolic resin, furan resin, epoxy resin It is obtained by carbonizing a thermosetting resin such as an unsaturated polyester resin, a urea resin, a melamine resin, an alkyd resin or a xylene resin at a high temperature.

This glassy graphite is characterized in that its fracture surface has a glassy luster, but in addition to this, the diffraction angle (2) of the spectrum in the usual X-ray diffraction method is used.
It is also confirmed by having a broad peak around θ) of 23 to 25 degrees. The X-ray diffraction method is according to a conventional method,
It is measured by Cu-Kα ray (double line).

Conventional carbon materials, such as graphite, do not have a broad peak like glassy graphite, and at other diffraction angles (2θ = 26.4 ° C.), sharp d ₀₀₂ peaks due to crystallinity are present. Indicates.

The glassy graphite used in the present invention includes
It may have substantially no peak characteristic of graphite. Further, a mere carbonized product of an organic substance does not have a glassy luster in its fracture surface, and of course, in the X-ray diffraction spectrum, neither the above glassy graphite nor the peak of a specific diffraction angle characteristic of graphite is naturally present.

By the way, such glassy graphite may contain an incomplete carbonized product or an uncarbonized product due to being produced by carbonizing a thermosetting resin such as a phenol resin as described above. is there.

That is, even if the glassy graphite is confirmed by the fact that the fracture surface has a glassy luster or has a wide peak at a specific diffraction angle in the X-ray diffraction spectrum, the glassy graphite is not May include fully carbonized or uncarbonized.

When glassy graphite is blended with the above polyimide resin, the presence of the above-mentioned incomplete carbonized product or uncarbonized product does not cause any problem in the above-mentioned molding process of the polyimide resin or the molded product itself. Often.
This is because these incompletely carbonized materials or uncarbonized materials are considered to be the thermosetting resin itself which is the raw material resin for the glassy graphite, or its thermally decomposed low polymer.

On the other hand, the polyimide resin has a high melting point, which is one of the characteristics of the polyimide resin, but it can be said to be abnormal among polymers. In such a case, the above-mentioned incompletely carbonized material or uncarbonized material contained in the glassy graphite is decomposed to easily cause gas generation. The generation of gas at high temperatures, especially in compression or molding under high pressure such as injection molding, even in a small amount, may be a fatal defect in a processing step or a molded product. For example, in an extreme case, the molding itself is difficult due to the generation of gas, or blisters and flow marks are generated on the surface of the molded product, and the commercial value of the molded product is lost.

Here, even in the case of glassy graphite characterized by a fractured surface having a glassy luster, the kind of raw material resin, its adjustment method, raw material particle shape, carbonization temperature,
Different properties are produced depending on the carbonization time, the type of atmospheric gas, the pressure during carbonization and other carbonization conditions. That is, the content of the incompletely carbonized material or the uncarbonized material in the manufactured glassy graphite and the property thereof are different.

In the blade of the vane motor of the present invention, in view of blending with the polyimide resin, it is preferable to use spherical glassy graphite having a weight loss of 5% by weight or less under the conditions peculiar to the polyimide resin. .

Here, for the measurement of the weight loss, for example, a thermobalance is used as a measuring instrument, and the temperature is reduced from room temperature to 10 ° C./min for 3
It is defined as the weight loss when heated to 50 ° C and held at that temperature for 30 minutes. Glassy graphite, which is usually produced at a carbonization temperature above 800 ° C, has a weight loss of 5
% By weight or less.

The glassy carbon whose weight loss is more than 5% by weight under the above conditions, when combined with the above-mentioned polyimide resin having a high melting point (about 385 to 390 ° C.), generates gas due to heating during molding ( Probably due to decomposition of carbonized thermosetting resin), molding becomes difficult, the appearance of molded products deteriorates, blisters (blisters), etc. occur, resulting in a decrease in productivity and commercial value.

On the other hand, the shape is preferably spherical, and more preferably close to a true sphere. The non-spherical shape such as an irregular shape is not preferable when it is used for a member such as the air tool vane of the present invention that is required to have slidability, because it causes abrasion of the metal or resin of the mating material.

Listed below are commercially available spherical glassy graphite powders that can be used in the present invention. The weight loss referred to below is 350 at a rate of 10 ° C / min from room temperature.
It refers to the weight loss when the temperature is raised to 0 ° C. and kept at this temperature for 30 minutes, and it can be measured using a commercially available thermobalance. The spherical glassy graphite powder that can be used in the present invention has a reduction value of 8% or less, preferably 0.
The content of 01 to 5% is preferable.

(A) Belle Pearl C-80 manufactured by Kanebo
0, weight loss 1.2%, average particle size 10 μm, (b) Kanebo Co., Ltd .: Bell Pearl C-2000, weight loss 0.
2%, average particle size 10 μm (c) Unitika Ltd .: Univex, GCP-50
(H), weight loss 0.5%, average particle size 30 μm, (d) Unitika Ltd .: Univex, GCP-50
(L), weight loss 5.1%, average particle size 30 μm, all of the above glassy graphite were confirmed to have a glassy gloss in the particle cross section, and measured by Cu-Kα ray (double line) X-ray diffraction angle (2θ) 23-25
It may also have a distinctly broad peak in the vicinity of degrees. Further, in the glassy graphites of (a), (c) and (d), the sharp peak peculiar to graphite was practically hard to be recognized, but in the carbon of (b) at the diffraction angle 2θ = 26.4 degrees. The d ₀₀₂ peak may be recognized as a shoulder.

The average particle size of the glassy graphite used in the present invention is 1 to 30 μm. The reason is that if the particle diameter is less than the above-mentioned predetermined particle size range, the particles tend to agglomerate and it is difficult to uniformly disperse in the matrix, and the desired sliding characteristics cannot be obtained. This is because the aggressiveness increases.

Also, spherical graphite other than glass is preferable. The external shape of such spherical powdery graphite may be not only a spherical surface having a smooth surface but also a surface having some irregularities. As a typical example of spherical powder having a smooth surface, ICB type manufactured by Nippon Carbon Co., Ltd. (carbon and graphite, particle size 5 to 500 μm, specific surface area ≦ 1, bulk specific gravity 0.8)
0 to 0.90, true specific gravity 1.35 to 1.40) or Admafine AO-509 manufactured by Admatech.

With respect to the firing temperature (heat treatment temperature) of the spherical particles, the maximum temperature is about 500 to 3000 ° C., preferably 800 to
It may be 2000 ° C. The size of the spheroidal graphite after firing is usually 1 mm or less in diameter, but the average particle size is 1
A powder having a particle size of 00 μm or less (preferably having an average particle size of 1 to 50 μm, more preferably 5 to 25 μm) is uniformly dispersed in the resin composition and is highly effective in reducing the thermal expansion coefficient, which is preferable. Thus, the spherical graphite having a narrow particle size distribution, a smooth surface, and high hardness improves the sliding characteristics of the vane motor blades in contact with the hard metal.

Since spherical graphite is not oriented in a specific direction during injection molding, the blade has no anisotropy, and because of its shape, it makes point contact with the sliding surface, which is effective in reducing the friction coefficient.

As a typical example of spherical carbon having fine irregularities on its surface, MC type manufactured by Nippon Carbon Co., Ltd. (graphite, particle size 5 to 30 μm, specific surface area ≦ 10, bulk specific gravity 0.60 to 60)
0.80, true specific gravity 1.37 to 1.39), or tin oxide SnO-G manufactured by Nippon Kagaku Sangyo Co., Ltd.

A method for producing spherical graphite, which is a typical spherical powdery filler, will be described below. The method for producing spherical graphite is not particularly limited, but so-called liquid phase carbonization method or solid phase carbonization method is suitable in order to obtain particles having a predetermined temporary particle size. Examples of manufacturing include the following (1) to (3).

(1) Phenolic resin, naphthalene resin,
Furan resin, xylene resin, divinylbenzene polymer,
At least one of styrene-divinylbenzene polymers is used as a starting material, spherical particles are prepared from these raw materials by a known emulsion polymerization method, and the spherical particles are further treated under an inert atmosphere such as nitrogen gas or argon gas or under vacuum. It is carbonized and / or graphitized by firing at.

(2) A novolac-type or resol-type phenol resin produced by using a formalin-generating compound for phenols may be added with a known filler, if necessary, and as it is or with a crosslinking agent such as hexamethylenetetramine. In addition, after heating to obtain a cured product, it is pulverized to a predetermined particle size.

(3) By heating coal tar or coal tar pitch at 350 to 500 ° C., spherical graphite produced by a polymerization reaction of low molecular weight substances is separated and purified.

As commercial products of the above-mentioned spherical graphite powder, in addition to Nippon Carbon Co., Ltd .: Carbon Microbeads ICB and MC, Kanebo: Bellpearl C-2000 and Osaka Gas: Meso are available. Carbon microbeads may be used, and the product may be either carbonaceous or graphitic.

If the blending amount of such graphite is 9 to 100 parts by weight (the total amount of graphites is 10 to 160 parts by weight) relative to 100 parts by weight of the polyimide resin, the abrasion resistance of the composition It is considered that the shrinkage before and after crystallization can be reduced when the molded product made of the composition is crystallized by heat treatment. If it is less than 9 parts by weight, the wear resistance of the molded body is hardly improved and
It is considered that when the amount is more than parts by weight (particularly when the total amount of graphite exceeds 160 parts by weight), the melt fluidity is remarkably reduced and the formability is deteriorated.

Examples of the fluorine resin used in the present invention include polytetrafluoroethylene (hereinafter referred to as PTF).
E, a thermal decomposition temperature of about 508 to 538 ° C.), a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA, a thermal decomposition temperature of about 46).
4 ° C or higher), tetrafluoroethylene-hexafluoropropylene copolymer (abbreviated as FEP, thermal decomposition temperature of about 419 ° C or higher), ethylene-tetrafluoroethylene copolymer (abbreviated as ETFE, thermal decomposition temperature of about 347 ° C) Above), tetrafluoroethylene-fluoroalkyl vinyl ether-fluoroolefin copolymer (abbreviated as EPE, thermal decomposition temperature about 440 ° C.), polychlorotrifluoroethylene (abbreviated as PCTFE, thermal decomposition temperature about 3)
47-418 ° C.), ethylene-chlorotrifluoroethylene copolymer (abbreviated as ECTFE, thermal decomposition temperature of about 3)
30 ° C. or higher), polyvinylidene fluoride (abbreviated as PVDF, thermal decomposition temperature of approximately 400 to 475 ° C.), polyvinyl fluoride (abbreviated as PVF, thermal decomposition temperature of approximately 372 to 480)
° C). These may be fluorinated polyolefins such as the above-mentioned two or more copolymers or terpolymers in the range of 1:10 to 10: 1, respectively. They exhibit good properties as solid lubricants.

Of these, PTFE has a melting point of about 327 ° C. and a melt viscosity of about 10 ¹¹ -1 even at about 340-380 ° C.
It is considered to be a resin having the highest heat resistance among fluororesins because it has a high value of 0 ¹² poise and is hard to flow even if it exceeds the melting point. When such PTFE is adopted, it may be a powder for molding or a so-called fine powder for a solid lubricant, and a commercially available product is Teflon 7J manufactured by Mitsui DuPont Fluorochemicals. (Product name), T
LP-10 (trade name), Asahi Glass Co., Ltd .: FLUON G163
(Trade name), manufactured by Daikin Industries, Ltd .: polyflon M15 (trade name), Lubron L5 (trade name), and the like. Alternatively, PTFE modified with an alkyl vinyl ether may be used. Generally, PTFE is a homopolymer of tetrafluoroethylene, and a commercially available resin can be used as a compression-moldable resin, for example, manufactured by Kitamura:
TFE grade KTL610, 400H (trade name)
Etc. can be adopted.

In the present invention, it is preferable to use recycled PTFE powder rather than uncured (so-called virgin material) PTFE. Regenerated PTFE is a powder obtained by firing a virgin material once and then pulverizing it, and does not significantly increase the melt viscosity of the added resin composition, and therefore does not impair the injection moldability. Also, recycled PTFE
Since the powder has been fired once, it is preferable for obtaining a molded product of stable quality without causing dimensional change, shape change or crack of the resin composition to which the powder is added. Note that PTFE has the highest heat resistance among fluororesins, and its thermal decomposition temperature is 508 to 538 ° C.

Commercially available recycled PTFE powder is, for example, Kitamura Co .: KT300M, KT400M, KT40.
OH, KTL610, etc.

As PFA, Teflon PFA-J (trade name) and MP-1 manufactured by Mitsui DuPont Fluorochemicals Co., Ltd.
0 (commercial name), Hoechst: Hostafuron TFA (commercial name), Daikin Industries, Ltd .: Neoflon PFA (commercial name), FEP as Mitsui DuPont Fluorochemicals Co., Ltd .: Teflon FEP-J (commercial name), Daikin Industries, Ltd .: Neoflon FEP (trade name), ETFE: Mitsui DuPont Fluorochemicals: Tefzel (trade name), Asahi Glass Co .: Aflon COP (trade name), and EPE: Mitsui DuPont Fluorochemical Co .: Teflon EPE-J (trade name) and the like can be mentioned.

Perfluorinated fluororesins such as PTFE, PFA and FEP are in a state in which carbon atoms as a skeleton are all surrounded by fluorine atoms or a trace amount of oxygen atoms, and a strong bond between C and F is generated. Among the fluorine-based resins, the heat resistance temperature is relatively high, and various characteristics such as low friction coefficient, non-adhesiveness, and chemical resistance are excellent, which are preferable. These fluorine-based resins are polyimide-based resins having a predetermined structural formula (Chemical formula 1, Chemical formula 2) (for example, AURAM manufactured by Mitsui Toatsu Chemicals Inc.
Since it has a thermal decomposition temperature characteristic higher than the melting point (380 to 390 ° C.) of PD450), it is preferable because it is difficult to thermally decompose during melt mixing and molding. For PVDF,
An example is KF polymer (trade name) manufactured by Kureha Chemical Industry Co., Ltd.

The above-mentioned fluororesin is mixed in an amount of 2 to 40 parts by weight with respect to 100 parts by weight of the polyimide resin. Because, when the amount is less than 2 parts by weight, the sliding properties such as self-lubricating property and abrasion resistance are not significantly improved, and when the amount is more than 40 parts by weight, the melt fluidity is remarkably lowered and the molding is performed. This is because the property deteriorates and the mechanical properties of the molded product also deteriorate. From such a tendency, a more preferable mixing ratio of the fluororesin is 5 to 30 parts by weight.

Next, the reinforcing fibers used in the present invention are aromatic polyamide fibers having high heat resistance and excellent sliding properties,
It is advisable to combine one or more heat resistant reinforcing fibers such as carbon fibers.

The aromatic polyamide fiber, which is an example of the reinforcing fiber, is a fiber having a repeating unit represented by the general formula shown in the following Chemical Formulas 5 to 7. Among such fibers, an aromatic aromatic fiber having a meta-type molecular structure is used. Representative examples of group polyamide fibers include Nomex (fibrous and paper-like) manufactured by DuPont USA, and Conex manufactured by Teijin Ltd. As typical examples of aromatic polyamide fibers having a para-type molecular structure, Examples include DuPont: Kepler (fibrous), Teijin: Technora, Nippon Aramid: Twaron.

[0067]

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(Having a meta-type molecular structure in the main skeleton)

[0069]

[Chemical 6]

(Having a para molecular structure in the main skeleton)

[0071]

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(In the formula, p and q are integers.) Since the para-aromatic polyamide fiber added to such a composition has molecular chains arranged in the axial direction, it has a high axial direction. It has elasticity and high strength, but the intermolecular force is weak in the perpendicular direction. As described above, the para-aromatic polyamide fiber can improve the abrasion resistance of the blended resin composition well due to the strength in the axial direction. On the other hand, when the compressive force is applied in the direction perpendicular to the molecular chain, the molecular chain becomes Since it is easily buckled or destroyed, it is considered that it does not damage the soft sliding mating material.

When an aromatic polyamide fiber other than a para-based resin is used, a fluorine-containing resin described below is added in the same manner as the above composition by adding a predetermined amount of a fluorine-containing resin such as an ethylene tetrafluoride resin. It is considered that the composition does not damage the soft sliding mating material and has excellent wear resistance.

The aromatic polyamide fiber has a fiber length of about 0.15 to 3 mm, preferably about 0.15 to about 5 mm.
It is preferably 1.5 mm and the aspect ratio is in the range of about 1 to 230. The average fiber diameter is preferably about 1 to 20 μm, more preferably about 5 to 15 μm. The aspect ratio is preferably about 1 to 60, more preferably about 15 to 40. When the fiber length of the aromatic polyamide fiber is less than the predetermined range, abrasion resistance becomes insufficient, and when the fiber length exceeds the above range, the dispersion in the composition becomes insufficient, which is not preferable. On the other hand, if the aspect ratio is less than 1, the shape is close to that of powder, the effect of improving the wear resistance is insufficient, the reinforcing effect of the matrix is lost, and the mechanical properties are lowered. On the other hand, when it exceeds 60, it becomes difficult to uniformly disperse it during mixing, and the wear characteristics of the composition are not uniform.

When the average fiber diameter is less than about 1 μm, the fibers are aggregated when mixed into the matrix, and uniform dispersion is difficult, and the average fiber diameter is about 20 μm.
If the diameter is larger than m, the composition may slide and wear the soft counterpart material. Those having an average fiber diameter of about 5 to 15 μm are considered preferable because such a tendency is not observed.

The carbon fiber, which is an example of the reinforcing fiber, is 1000 ° C. or higher, which is generally used at present, preferably 1
As long as it can withstand a high temperature of 200 to 1500 ° C., rayon type, polyacrylonitrile type, lignin-poval type mixture, special pitch type and the like can be used regardless of the kind of raw material. Further, the shape thereof may be long or short monofilament, or may be a product shape such as a knitted or woven fabric, a non-woven fabric, a thread, a string or the like which has undergone primary processing such as cloth, felt, paper and yarn. .

Further, without particularly limiting the material,
It may be pitch-based, PAN-based, or carbonaceous, and for example, fiber diameter is about 4 to 20 μm, fiber length is about 10 to 1.
If it is 000 μm, preferably 10 to 500 μm, it is suitable because it is uniformly dispersed in the resin composition and sufficiently reinforced.

Considering mechanical properties such as appropriate elastic modulus and tensile strength, aggressiveness to the mating material such as cylinder and rotor, and fluidity of the resin composition at the time of molding, the carbon fiber diameter is an average value. It is preferable that the fiber length is about 5 to 14 μm and the fiber length is about 10 to 500 μm.

The carbon fiber is produced by firing the above-mentioned various organic polymer fibers at an average temperature of about 1000 to 3000 ° C. This structure is composed mainly of hexagonal mesh planes of carbon atoms. An example of this mesh plane arranged in parallel to the fiber axis is a PAN-based or liquid crystal pitch-based carbon fiber having high orientation and anisotropy. An example is pitch-based carbon fiber having isotropic property.

Highly oriented and anisotropic carbon-based fibers are highly excellent in elasticity and tensile strength in a specific direction, and isotropic carbon-based fibers are also excellent in loads applied from all directions. Relatively tolerable.

Pitch-based carbon-based fibers are, for example, isotropic pitch-based carbon-based fibers which are structurally amorphous, such as petroleum pitch produced as a by-product in petroleum refining, and structures in a certain direction, such as optical anisotropy. Anisotropic pitch carbon fiber.

Isotropic pitch-based carbon fibers are classified into petroleum-based, coal-based, synthetic product-based, liquefied coal-based, etc., and their raw materials are melt-spun into pitch fibers and subjected to infusibilization treatment. It is manufactured by

The liquid crystal pitch-based carbon fiber is obtained by heating pitches in an inert gas phase to bring them into a liquid crystal state at 350 to 500 ° C., and then solidifying into coke. When this is melt-spun and heated in an oxidizing atmosphere, it becomes an oxidized fiber and becomes an insoluble and infusible fiber, and is further manufactured by, for example, a method of heating it to about 1000 ° C. or higher in an inert gas phase.

These have an average tensile elastic modulus of 30 to 50 G.
A low elastic modulus of about Pa to an average or high elastic modulus of about 240 to 500 GPa can be selected as required, and other fibers having excellent mechanical properties such as tensile strength are mixed with a predetermined resin composition. Thus, a vane material for a vane motor having appropriate mechanical strength can be obtained.

As an example of such pitch-based carbon fiber, Kureha Chemical Industry Co., Ltd .: Creca Chop M107T or M
207S (fiber diameter is 12 to 13 μm) and the like can be cited as a whole of “Kureka Chop” (trade name) series.

The PAN-based carbon fiber can be manufactured by a method of heating and baking acrylic fiber such as polyacrylonitrile fiber. A predetermined tensile modulus can be obtained depending on the heating temperature, for example, about 1000 to 150.
When heated at 0 ° C, the tensile elastic modulus averages 20 to 30 GPa,
The average tensile strength is 300 to 6000 MPa, preferably 3
000 to 6000 MPa. It can also be heated at about 2000 ° C. to have a tensile elastic modulus of 350 to 500 GPa on average and preferably 400 to 500 GPa on average.
Therefore, the PAN-based carbon fiber has high tensile strength and has an average tensile strength of 500 to 6000 MPa depending on the heating temperature.
It is also considered that an average range of 1000 to 6000 MPa can be obtained, and an average range of 500 to 3000 MPa or an average range of 1000 to 3000 MPa can be produced according to requirements. If these values are too low, reinforcement regarding compression creep and the like cannot be expected, and if these values are too high, it is expected that the mating material such as the rotor and cylinder will be attacked.

Examples of this PAN-based carbon fiber include "Vesfite" (trade name) series manufactured by Toho Rayon Co., Ltd., and specific examples thereof include Vesphite HT.
A-CMF-0040-E, Vesphite HTA-CM
F-0160-E, Vesphite HTA-CMF-10
00-E, Vesphite HTA-C6-E, etc. (all of them have a fiber length of 7 to 8 μm). In addition, there are all Torayca (trade name) series manufactured by Toray Co., Ltd., and specific examples thereof include Trading Card MLD-300 and Trading Card MLD.
-1000 etc. are mentioned.

The tensile strength of these carbon fibers is preferably 550 to 1000 MPa, and the Vickers hardness (Hv) is preferably 400 to 600. When the tensile strength is less than 550 MPa, Vickers hardness (Hv)
When the value is less than 400, the reinforcing effect of adding the carbon fiber cannot be expected, and when the tensile strength is more than 1000 MPa or the Vickers hardness (Hv) is more than 600, the mating material can be attacked and worn. It is conceivable and may be unfavorable.

These carbon fibers are not easily affected by chemicals such as acids and alkalis, and have abrasion resistance.

In order to improve the adhesion between the above aromatic polyamide fibers or these carbon fibers and the above resin, and to improve the mechanical properties of the sliding material in oil, etc., the above aromatic polyamide fibers are used. And the surface of these carbon-based fibers epoxy resin, polyamide resin, polycarbonate resin,
The surface treatment may be performed with a treatment agent containing a polyacetal resin, a silane coupling agent, or the like.

Among the above carbon fibers, the tensile strength is 55.
It is considered that those having a range of 0 to 1000 MPa and a tensile elastic modulus of 30 to 50 GPa are preferable. It is expected that when the tensile strength and the tensile elastic modulus are lower than the lower limits, the reinforcing effect by the carbon fiber cannot be obtained, and when the tensile strength and the tensile modulus are higher than the upper limits, the abrasion resistance is poor.

The mixing ratio of the reinforcing fibers is 1 to 33 parts by weight, preferably 6 to 33 parts by weight, more preferably 6 to 20 parts by weight, based on 100 parts by weight of the polyimide resin. This is because if the amount is less than 1 part by weight, the abrasion resistance of the molded body is hardly improved, and if the amount exceeds 33 parts by weight, the melt fluidity is remarkably reduced and the moldability is deteriorated.

The thermotropic liquid crystal polymer (hereinafter abbreviated as LCP) used in the present invention has a basic structure represented by the following chemical formulas (I) to (III). Examples of such LCP include commercially available Nippon Petrochemical Co., Ltd .: Zyder, Sumitomo Chemical Co., Ltd .: Sumika Super, and the like.

[0094]

Embedded image

If such an LCP is blended in an amount of 1 to 10 parts by weight within the above-mentioned predetermined range, it is possible to improve the flowability during melt molding and reduce the shrinkage rate during crystallization. However, if the amount is less than 1 part by weight, the flowability is not improved and the deformation during crystallization is not alleviated. If the amount is more than 10 parts by weight, the wear resistance is significantly impaired as described above.

As long as the effects of the present invention are not impaired,
For example, various fillers other than the above may be added in the range of about 0.1 to 20 parts by weight. Examples of such fillers include organic materials such as aromatic polyetherketone-based resins, polyetherimide-based resins, polyethersulfone-based resins, polyamideimide-based resins, polyamide-based resins, phenol-based resins, and aromatic-based polyester resins. In addition to heat-resistant polymers, inorganic powder for improving heat conduction such as metals such as zinc, aluminum and magnesium or oxides, glass beads, silica balloons, diatomaceous earth, asbestos, inorganic powders such as magnesium carbonate, carbon, mica,
Inorganic powders for improving lubricity such as talc and phosphate compounds, or inorganic pigments such as iron oxide, cadmium sulfide, cadmium selenide and carbon black, silicone oil,
Internal lubricant additives such as ester oil, fluorine oil, wax, zinc stearate, molybdenum disulfide,
A large number of solid lubricants such as tungsten disulfide and boron nitride can be exemplified.

The average particle size of the lubricant and filler is not particularly limited, but may be about 1 μm or more, preferably about 5 μm or more and about 100 μm or less, preferably about 70 μm or less. If the average particle size is too small, it causes aggregation, resulting in poor dispersion, and if it is too large, moldability becomes difficult, it may cause poor dispersion, and the sliding mating material may be damaged. .

The means for mixing the raw materials in the present invention is not particularly limited, and even if the raw materials are individually supplied to the melt mixer, a general-purpose equipment such as a Henschel mixer, a ball mixer, a ribbon blender or the like is used in advance. You may mix 2 or more types simultaneously using a mixer. Usually, the mixing temperature is 250 to 420 ° C., preferably 300 to 40.
The temperature is 0 ° C., and as a molding method, compression molding, sinter molding or the like can be applied, but a uniform melt blend can be formed and injection molding or extrusion molding with high productivity can be performed. Usually, the melt molding temperature is required to be higher than the melting point of the above-mentioned polyimide resin used, and generally 390 to 390.
The range is 450 ° C.

For these injection molding and the like, a usual injection molding method or the like can be used, and the air tool vane of the present invention can be easily molded. Therefore, a complicated molding method such as cutting after compression molding is not required.
The type of the air tool vane of the present invention is not particularly limited, and various air tool vanes can be used.

Regarding the heat treatment method of the above-mentioned molded product, the heating temperature needs to be in the range of 250 to 340 ° C, preferably 270 to 330 ° C. At a temperature of 340 ° C or higher, the molded product is significantly deformed, which is not preferable for practical use. On the other hand, at a temperature of less than 250 ° C, the mechanical properties of the molded product cannot be improved. The time required for the heat treatment varies greatly depending on the heating temperature and requires at least 2 minutes or more, and in some cases several weeks.

There is a certain rule between the improvement of mechanical properties of the molded product by the heat treatment and the change in its density, and the density of the polyimide component in the molded product is at least 1.5%,
The time required for the heat treatment may be the time sufficient to increase the density by preferably 2%, more preferably 1 to 3%.

The heat treatment conditions for improving the mechanical properties of the molded product, that is, for increasing the density are, for example, as follows:
12 hours or more under 270 ° C, 1 hour or more under 280 ° C, 10 minutes or more under 300 ° C, 2 minutes or more under 330 ° C, 10 minutes or more under 340 ° C. The time required is minimal. 33 at 260 ° C
It is not practical because it requires 672 hours at 6 ° C. and 250 ° C., and conversely at a temperature of 340 ° C. or higher, for example 350.
In the case of ℃, it causes a remarkable change in the molded product, which is also not practical.

Therefore, the heat treatment conditions are 270 to 33.
The treatment time is preferably 0 ° C. and the treatment time is 12 hours to 2 minutes. Under these conditions, improvement in physical properties is recognized. Also, gradually heating,
By cooling, warpage does not occur and dimensional stability can be maintained. And the total time spent in the heat treatment process is 8 to
It is efficient to carry out the treatment for 48 hours, preferably for 10 to 30 hours. When the crystallinity of the resin material is set to 10 to 60% by the heat treatment as described above, the mechanical properties can be improved, which is preferable.

In the melt molding of the above resin, the temperature of the cooling mold used is 250 to 340 ° C., preferably 270 to 33.
By setting the temperature to 0 ° C., filling the mold with the molten resin, and allowing the mold to stand for a time corresponding to the heat treatment time, it is possible to improve mechanical properties and the like at the same time during molding.

The surface roughness of the sliding surface of at least one of the molded air tool vane and the mating member is maximum roughness (Rmax), arithmetic average roughness (Ra), ten-point average roughness (Rz), etc. Measured by an evaluation method defined in JIS of about 25 μm or less, preferably about 8 μm or less,
More preferably about 3.2 μm or less. This is because, if the surface roughness exceeds the above-mentioned predetermined range, the sliding surface is likely to have many scratches, which is considered to cause wear. The lower limit of the surface roughness may be about 0.01 μm or more in consideration of the efficiency at the time of processing.

Moreover, since it takes a long time to finish the surface of the mating material, it may be inefficient or affected by the formation of the transition film of the resin material. Or 0.1 to 10μ
It is estimated that the range may be about m (Ra).

The mating materials such as the rotor and the cylinder are
Carbon steel such as SCM and structural alloy steel materials (for example, S45C,
SCM420H etc.), spheroidal graphite cast iron such as FCD (eg FCD45 etc.) or the like, or a hard material such as a hardened material thereof, or a soft material such as an aluminum alloy such as ADC12. The partner material is preferably a casting metal that is comprehensively excellent in terms of processing efficiency, productivity, price, etc., among which, a lightweight casting metal alloy such as ADC is preferable, but any steel or alloy is preferred in the invention of the present application. It may be a kind.

[0108] the carbon steel, the hardness of such structural alloy steel or spheroidal graphite cast iron is 30 to 60 in H _R C (Rockwell hardness (C scale)). Examples having this hardness, the SCM, SCM420H and the like, the hardness becomes 58-62 in H _R C, for example, quenching or the like.
Further, for example, in the case of FCD, there is FCD420, and the hardness thereof is 143 to 217 in HB. Further, these may be subjected to quenching treatment such as induction hardening, carburizing and quenching as the above treatment method to improve hardness.

The blades of the inventions of the present application may be used in a completely unlubricated state and, if necessary, may be lubricated / lubricated as needed in a periodic inspection or the like. Since it has excellent sliding characteristics, it is preferable because the number of times of lubrication / lubrication can be reduced and maintenance-free can be achieved.

[0110]

EXAMPLES Examples will be described below. The raw materials used in the examples and comparative examples are collectively shown below, and the abbreviations are shown in []. (1) Polyimide resin [PI] Mitsui Toatsu Chemical Co., Ltd .: AURUM PD450 (2) Polyether ether ketone resin [PEEK] Mitsui Toatsu Chemical Co., Ltd .: Victrex PEEK150P (3) Polyphenylene sulfide resin [PPS] Topren : PPS-T4 (4) Carbon fiber-containing phenol resin [PH] Sato Bearing Industry Co., Ltd .: SKCP5001 (5) Scale natural graphite [scaly graphite] Nippon Graphite Co., Ltd .: Graphite powder ACP (fixed carbon amount 99.5)
%) (6) Artificial graphite [Artificial graphite] Kanebo Co., Ltd .: Bell Pearl-2000 (fixed carbon amount 99.8)
%) (7) Soil-granular natural graphite [Soil-granular graphite] Nippon Graphite Co., Ltd .: Blue P (fixed carbon content 92.5%) (8) Tetrafluoroethylene resin [PTFE] Kitamura Co., Ltd .: KTL610 (9) Carbon Fiber Kureha Chemical Industry Co., Ltd .: Creca Chop M107T (10) Aromatic polyamide resin (aramid fiber) [AR
F] Nippon Aramid Co., Ltd .: Twaron-0.25MM-cut fiber (11) Thermotropic liquid crystal polymer [LCP] Sumitomo Chemical Co., Ltd .: Sumika Super E5000.

[Examples 1 to 7 and Comparative Examples 1 to 6] Raw materials were blended in the proportions (parts by weight) shown in Table 1 or Table 2 and dry-blended, and then mixed with a twin-screw melt extruder at 370 to 400. The mixture was extruded at ℃ and granulated into pellets. This pellet is supplied to an injection molding machine, and the cylinder temperature is 350 to 400 ° C.
Air tool vane (thickness 1.2 mm, upper width 30.0 mm, lower width 14.0 mm, height 5.0 mm is prepared by injection molding under conditions of injection pressure 1100 to 1300 kgf / cm ² and mold temperature 200 ° C. Shape, surface roughness 0.1-5 μm Ra)
Was molded. This vane just after injection molding,
The temperature is raised by step heating to 300 ° C over 12 hours,
After being kept as it was for 2 hours, it was gradually cooled to room temperature for 6 hours to complete the annealing treatment. The crystallinity of the vane after this annealing treatment was about 40%.

[Comparative Examples 7 and 8] The granulation temperature in the twin-screw melt extruder, the molding conditions in the injection molding machine and the annealing conditions were set to P.
Vanes of the same shape (same dimensions) were produced by the same production method as in the above-described example except that the EEK or PPS was set under appropriate conditions.

[Comparative Example 9] A vane having the same shape (same size) as that of the above-described example was prepared from a round bar-shaped carbon fiber-containing phenol resin (PH) material by machining such as cutting.

<Abrasion Resistance Test> Examples 1 to 7 and Comparative Examples 1 to 1
9 vanes with vane motor (air tool air motor)
Built-in, supply air without lubrication oil with a compression pump, continuously at 25000 rpm under the condition of no lubrication and room temperature.
An endurance test of rotating for 00 hours was performed. Three vanes were used for each air tool.

In this durability test, it was stopped 500 hours after the start, and the amount of wear of the vanes (the size (unit: mm) in the height direction of the trapezoid shortened due to the wear of the end faces of the vanes) was measured. The evaluation was carried out 1000 hours after the start of the test.
If it was less than or equal to the wear amount of 00 mm, the allowable range was set. The results are shown in Table 1 or Table 2.

[0116]

[Table 1]

[0117]

[Table 2]

As is clear from the results shown in Tables 1 and 2, all of Examples 1 to 7 in which the vane motor blades were made of polyimide resin had good wear resistance under non-lubricating use conditions. The vanes (blades) containing graphite and fluororesin were particularly excellent in wear resistance.

On the other hand, Comparative Examples 7 and 8 using a resin (PEEK, PPS, PH) other than the polyimide resin as a base material.
Nos. 9 and 9 had poor wear resistance under non-lubricated conditions and were not suitable for use as vane motor blades.

Further, Comparative Example 1 made of a resin composition containing no graphite and Comparative Example 3 containing soil-grained graphite were
Since warpage occurred after the annealing treatment, it could not be used in the abrasion resistance test, and Comparative Example 2 containing a predetermined amount or more of graphite could not be molded by injection molding.

Further, Comparative Example 4 in which LCP was blended in a predetermined amount or more, Comparative Example 5 in which the fluororesin (PTFE) was blended in a predetermined amount or more, and Comparative Example 6 in which carbon fiber was blended had satisfactory results in the abrasion resistance test. Was not obtained.

[0122]

The vane blade of the vane motor obtained according to the present invention is a blade having long-term dimensional stability while maintaining wear resistance and fatigue resistance even under operation without lubrication or regular lubrication. It is possible to eliminate the adverse effects of positively refueling, such as the deterioration of the work environment, the adverse effects on products, and the high costs of refueling equipment.

Further, by using the molded product of the resin composition of the present invention for the blade of the vane motor of the air tool, the wear resistance and fatigue resistance are improved, and the long-term accurate operation becomes possible. It is possible to use a processing method that is excellent in precision moldability by injection molding.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area C08K 3:04 7:02)

Claims (7)

[Claims] 1. A vane motor blade comprising a molded product of a resin composition containing a polyimide resin as a main component. 2. A graphite resin in an amount of 10 to 160 parts by weight and a fluorine resin in an amount of 2 to 4 relative to 100 parts by weight of a polyimide resin.
A vane motor blade comprising a molded body of a resin composition containing 0 parts by weight as an essential component. 3. 100 parts by weight of polyimide resin, graphite 1
A vane motor blade comprising a molded product of a resin composition containing 0 to 160 parts by weight, a fluororesin of 2 to 40 parts by weight, and a reinforcing fiber of 5 to 35 parts by weight. 4. 100 parts by weight of polyimide resin, 10 to 160 parts by weight of graphite, 2 to 40 parts by weight of fluorine resin, 5 to 35 parts by weight of reinforcing fiber and 1 to 10 parts by weight of thermotropic liquid crystal polymer. A vane motor blade made of a molded product of a resin composition as an essential component. 5. The polyimide-based resin is a thermoplastic polyimide-based resin represented by the following chemical formula 1.
The vane of the vane motor according to any one of 1. Embedded image 6. The vane motor blade according to claim 2, wherein the fluororesin is a perfluoro fluororesin. 7. The vane motor vane according to claim 6, wherein the fluorine-based resin is a tetrafluoroethylene resin.