JPH10316842A - Heat-resistant and lubricating resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart excellent low-friction characteristics and abrasion resistance and nonattacking properties for a soft alloy such as an aluminum alloy to a heat-resistant and lubricating resin composition and to provide a heat-resistant sliding bearing using the resin composition. SOLUTION: This heat-resistant and lubricating resin composition contains 5-65 vol.% polyamide-imide resin, 30-80 vol.% polyester resin and 5-30 vol.% fluororesin such as polytetrafluoroethylene. Otherwise, the composition is obtained by adding 1-15 vol.% flaky graphite or 1-15 vol.% phosphoric ester compound to the composition. The heat-resistant sliding bearing is obtained by molding the composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-resistant and lubricating resin composition used as various sliding members, and more particularly to a heat-resistant and lubricating resin composition which can be applied to a sliding member for sliding contact with an aluminum alloy in a heat fixing device of an electrophotographic apparatus. -It relates to a lubricating resin composition and a heat-resistant sliding bearing.

[0002]

2. Description of the Related Art In recent years, applications of synthetic resin sliding bearings have become widespread, and the need for synthetic resin sliding bearings exhibiting good friction and wear characteristics even in a high-temperature atmosphere has increased.

[0003] A relatively soft aluminum alloy or the like may be used as a sliding partner of a bearing, but even in such a case, the bearing is required to have properties that do not damage the sliding partner. Examples of applications of the sliding bearing requiring the above characteristics include a bearing for a heat fixing device in an electrophotographic apparatus such as a copying machine or a laser beam printer.
This bearing is a sliding bearing made of synthetic resin that supports a heated component such as a heating roller and a fixing roller. Here, the mode of use of such a synthetic resin sliding bearing will be described below.

That is, an electrophotographic apparatus such as a copying machine or a laser beam printer is a device having a mechanism for transferring information of an original image to a transfer material such as paper via a charged image. As illustrated in FIG. 3, the heat fixing unit in the apparatus includes:
Heating roller 10 for heating and fixing a toner image on a transfer material
And a pressure roller 11 that presses the transfer material against the heating roller 10 and rotates the transfer material.

The heating roller 10 is generally formed of an aluminum alloy, and is heated at about 150 to 230.degree.
Heated to a temperature of The pressure roller 11 is made of an iron material coated with silicone rubber or the like.
Used at a temperature of about 70 to 150 ° C. by heat transfer from

Further, the fixing device shown in FIG. 4 has a different mechanism from the above-mentioned fixing device, and has an endless annular shape in which a release agent is coated on a heat-resistant synthetic resin film instead of a metal heating roller. Using the fixing film 15, the ceramic heater 16 is connected to the pressing roller 11 through the fixing film 15.
To improve heat transfer efficiency. Pressure roller 11
Is located very close to the ceramic heater 16, the temperature of the fixing device becomes higher than that of the fixing device using the metal heating roller 10 described above. In addition, the number 17 in the figure
Indicates a guide roller.

The ends of the rollers used in such a high temperature state are supported by sliding bearings 13 and 14 (substantially the same bearing corresponding to 14 in the apparatus of FIG. 4) made of synthetic resin. As the material, a polyphenylene sulfide (hereinafter abbreviated as PPS) resin, which is a thermoplastic synthetic resin having good heat resistance and excellent mechanical strength, has been used.

However, the above-mentioned conventional heat-resistant and lubricating composition based on a PPS resin cannot maintain a low friction coefficient stably under high temperature and high load conditions, and has a sufficient abrasion resistance. There was a problem that it was not a physical property.

Also, a resin composition in which a synthetic resin powder having good heat resistance and an ethylene tetrafluoride resin are added to a PPS resin is known. Specifically, an aromatic polyester resin and an ethylene tetrafluoride resin are added to the PPS resin. Compositions containing a resin are disclosed in JP-A-57-167348 and JP-A-63-1.
These compositions are disclosed in Japanese Patent No. 75065 and exhibit good abrasion resistance at room temperature.

[0010]

However, a composition obtained by mixing a PPS resin with an ethylene tetrafluoride resin and an aromatic polyester resin is converted into an aluminum alloy (usually an Mg-containing Al alloy) at a high temperature of about 200 ° C., for example. When sliding is performed, there is a problem that the sliding partner material is damaged and the composition itself is worn.

When carbon fiber is blended with such a composition, the wear resistance is improved. However, when the sliding partner is a soft metal such as an aluminum alloy, it is damaged, and the friction is further increased with the damage. -Wear characteristics are likely to deteriorate.

A resin composition in which a tetrafluoroethylene resin and a carbonate of an alkali metal or an alkaline earth metal are added to a synthetic resin as a main component is disclosed in JP-A-5-78.
687 and JP-A-5-112723. However, such a resin composition has abrasion resistance and a mating material when sliding against a soft mating material such as an aluminum alloy in a high temperature use condition. Satisfactory results were not obtained in terms of damage.

By the way, 6T nylon (polyamide 6T)
A composition in which a solid lubricant is blended with a resin) or a polyester resin has relatively good abrasion resistance if the sliding time is short, but causes thermal degradation when exposed to high temperatures for a long time. There was a disadvantage that the subsequent abrasion resistance was significantly reduced.

Polyamideimide resin is a resin having excellent heat resistance, but has a drawback that it has poor fluidity during melt molding and is difficult to melt-mold by injection molding or the like. A sliding component made of a conductive resin composition could not be efficiently produced.

Further, when a flame retardant such as a phosphate compound is added to the heat resistant resin, there is a problem that the wear resistance is remarkably reduced.

Accordingly, a first object of the present invention is to solve the above-mentioned problems and to make the heat-resistant and lubricating resin composition more stable for a longer time than the conventional heat-resistant and lubricating resin composition for a fixing device. A heat- and lubricating resin composition that exhibits low friction characteristics, abrasion resistance, heat deterioration resistance and melt fluidity, and exhibits non-aggression to soft metals such as aluminum alloys for a long time, or was used with this. A heat-resistant plain bearing is to be used.

A second object of the present invention is to provide a heat-resistant and lubricating resin composition having all of low friction characteristics stable for a long time, wear resistance, heat deterioration resistance, melt fluidity and excellent flame retardancy. And a heat-resistant and lubricating resin composition that exhibits a non-aggressiveness to soft metals such as aluminum alloys for a long time,
Alternatively, a heat-resistant sliding bearing formed from such a resin composition is provided.

[0018]

In order to solve the above-mentioned first problem, in the present invention, 5 to 65% by volume of a polyamideimide resin, 30 to 80% by volume of a polyester resin and 5 to 30% by volume of a fluororesin are used. The heat-resistant / lubricating resin composition to be contained, or the molding thereof was used as a heat-resistant sliding bearing.

Alternatively, a heat-resistant lubricating resin composition obtained by adding 1 to 15% by volume of flake graphite to the above-mentioned heat-resistant lubricating resin composition, or a heat-resistant sliding bearing formed by molding the same. is there.

In order to solve the above-mentioned second problem, a polyamide-imide resin of 5 to 65% by volume, a polyester resin 30
A heat-resistant / lubricating resin composition comprising a heat-resistant / lubricating resin composition containing 1 to 15% by volume of a phosphoric acid ester compound or a heat-resistant / lubricating resin composition containing 5 to 30% by volume of a fluororesin, As a result, a heat-resistant plain bearing was obtained.

Alternatively, a heat-resistant lubricating resin composition obtained by adding 1 to 15% by volume of flaky graphite to the above-mentioned heat-resistant lubricating resin composition, or a heat-resistant sliding bearing formed by molding the same. is there.

The heat-resistant and lubricating resin composition of the present invention is obtained by adding a polyester resin to a polyamide-imide resin having a high melt viscosity and further mixing a predetermined amount of a fluororesin such as polytetrafluoroethylene. Having the required heat resistance and showing good lubricity, it becomes a heat-resistant and lubricating resin composition that can be melt-molded such as injection molding, and also does not damage its surface when sliding on a soft aluminum alloy, A molded article such as a resin composition or a sliding bearing exhibiting good lubrication characteristics is obtained.

The resin composition in which a predetermined amount of flaky graphite is blended with the above resin composition has excellent abrasion resistance in addition to the above-mentioned properties, and does not damage its surface particularly when sliding on a soft aluminum alloy. Moreover, it becomes a molded article such as a heat-resistant and lubricating resin composition having excellent self-wear resistance and a sliding bearing.

Further, as described above, a resin composition in which a predetermined amount of a phosphoric ester compound is blended with a resin composition comprising a polyamideimide resin, a polyester resin, and a fluororesin, has heat resistance, lubricity, injection molding and the like. A molded article such as a heat-resistant / lubricating resin composition or a sliding bearing which does not damage its surface when slidably in contact with a meltable and soft aluminum alloy and has excellent flame retardancy.

Further, the resin composition comprising the above-mentioned polyamideimide resin, polyester resin and fluororesin,
The resin composition blended with the phosphate ester compound and flaky graphite in combination with heat resistance, lubricity, melt moldability such as injection molding, does not damage its surface when sliding on a soft aluminum alloy, and An excellent heat- and lubricating resin composition or a molded article such as a sliding bearing, which has all of the advantages of its own wear resistance, friction coefficient reduction effect, and flame retardancy.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION The polyamideimide resin (hereinafter abbreviated as PAI) used in the present invention is represented by the following formula (1), and R ₁ is an aromatic compound containing at least one benzene ring. Divalent groups of which two carbonyl groups are bonded to adjacent carbon atoms in the benzene ring of R ₁ . The PAI used in the present invention may be a copolymer with a compound containing such a structure and another amide bond.

[0027]

Embedded image

(In the formula, R ₁ represents a trivalent aromatic group containing at least one benzene ring, R ₂ represents a divalent organic group, and R ₃ represents hydrogen, a methyl group or a phenyl group.) Examples of desirable R 1 in the formula ₁ are as shown in the following chemical formula 2.

[0029]

Embedded image

Examples of desirable R ₂ in the formula ( ₁ ) include — (CH ₂ ) _m — (wherein m is a saturated aliphatic hydrocarbon group of 4 to 12) and the following formula (3). There is something.

[0031]

Embedded image

(In the general formula of the group shown in Chemical formula 3, Y is 1 to
3 integers, X ₄ is an aliphatic hydrocarbon group or an aromatic group having 1 to 6 carbon atoms. In addition, it is more preferable to copolymerize a unit having the following structure with these PAI resins in order to improve the compatibility with the polyester resin and further improve the melt fluidity.

[0033]

Embedded image

[0034]

Embedded image

Ar _{1 in} the formula ( ₁₎ is a divalent aromatic group, and specific examples thereof include those shown in the following formula (6).

[0036]

Embedded image

R ₁ shown in the formula is a divalent aliphatic group, and specific examples thereof include — (CH ₂ )
_m- . More preferably - (CH _{2) m} - is
m = 2 to 12, particularly preferably m = 4
~ 12.

The copolymer composed of the structure represented by the chemical formula 1 and the structure represented by the chemical formula 4 is preferably such that the chemical formula 1 has 10 to 70 mol%, Those having a composition in which Chemical Formula 4 comprises 90 to 30 mol% are preferred.

Further, the copolymer having the structure represented by the chemical formula 1 and the structure represented by the chemical formula 5 is preferably such that the compound represented by the chemical formula 1 is
A composition having a composition of 50 mol% and 90 to 50 mol% is preferable.

The copolymer having the structure of Chemical Formula 1, Chemical Formula 4 or Chemical Formula 5 has a composition of 10 to 70 mol% of Chemical Formula 1, 1 to 89 mol% of Chemical Formula 4, and 1 to 70 mol% of Chemical Formula 5. Are preferred. The arrangement of each structure in the above copolymer may be random, block, or alternating.

Such a method of producing PAI is well known as disclosed in patent publications such as US Pat. No. 3,625,911 and Japanese Patent Publication No. 50-33120.
For example, an aromatic tricarboxylic acid anhydride or a derivative thereof represented by the following formula 7 and H ₂ N—R ₂ —N
H ₂ , OCN—R ₂ —NCO, wherein R ₂ is the same as described in Chemical formula 1 or Chemical formula 2, and dimethylacetamide, dimethylformamide or In a polar organic solvent such as N-methylpyrrolidone, a reaction is performed at a predetermined temperature for a required time to produce a polyamic acid, which is converted into an imidized state by heating or other methods.

[0042]

Embedded image

As the PAI produced by this method, there is a PAI represented by the following chemical formula 8, and its commercial product is Torlon (registered trademark) manufactured by Amoco Corporation in the United States.

[0044]

Embedded image

Since the PAI obtained by the above method is inferior in melt fluidity, it is preferable to adopt a method of producing from aromatic tricarboxylic anhydride and diisocyanate in order to obtain PAI having better fluidity. Further, in the polymerization, it is more preferable to carry out the reaction under conditions such that the amidation and the imidation proceed stepwise as shown in JP-A-6-322060.

The compounding amount of PAI in the heat and lubricating resin composition of the present invention is 5 to 65% by volume. When blended in a large amount beyond this range, the fluidity in the molten state is reduced, and injection molding becomes difficult, which is not preferable, and a small amount less than the predetermined range is not preferable because desired heat resistance cannot be obtained. .

The polyester resin used in the present invention is:
Obtained by polycondensation of polybasic acid and polyhydric alcohol,
It is a thermoplastic resin having an ester bond in the main chain of the molecular structure, and has a good melt fluidity. As a specific example,
Polycondensate of dicarboxylic acid or derivative thereof and dihydric alcohol or phenol compound, polymer of dicarboxylic acid or derivative thereof and cyclic ether compound, polycondensate of metal salt of dicarboxylic acid and dihalogen compound, cyclic ester compound And the like. The term “dicarboxylic acid derivative” as used herein means an acid anhydride, an ester, an acid halide or the like. The dicarboxylic acids may be aliphatic or aromatic.

Preferred polyester resins include crystalline aromatic polyesters obtained from aromatic dicarboxylic acids and derivatives thereof and dihydric alcohols. Terephthalic acid such as polyethylene terephthalate and polybutylene terephthalate or derivatives thereof are used as raw materials. And naphthalene dicarboxylic acids such as polyethylene naphthalate and polybutylene naphthalate, particularly naphthalene-2,6-dicarboxylic acid or a derivative thereof as a raw material.

Further, more preferred polyester resins are polyesters made from terephthalic acid or a derivative thereof such as polyethylene terephthalate or polybutylene terephthalate and a dihydric alcohol, and the most preferable one is polyethylene terephthalate or polybutylene. Terephthalate.

The blending amount of the polyester resin in the heat-resistant / lubricating resin composition of the present invention is 30 to 80% by volume. If the amount is larger than this range, the desired heat resistance cannot be obtained, so that it is not preferable. If the amount is smaller than the above-mentioned predetermined range, the fluidity in a molten state is lowered, and injection molding becomes difficult, which is not preferable.

The phosphate ester used in the present invention is an ester derived from various phosphoric acids and alcohols, and includes non-halogen phosphate esters and halogen-containing phosphate esters.

Specific examples of the non-halogen phosphate include trimethyl phosphate, triethyl phosphate, tripropyl phosphate, tributyl phosphate, tri-2-ethylhexyl phosphate, tributoxyethyl phosphate, triphenyl phosphate, and the like.
Examples include tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, xylenyl diphenyl phosphate, 2-ethylhexyl diphenyl phosphate, and condensed phosphoric esters of the compounds with phenols.

Examples of the halogen-containing phosphoric acid ester include tris (chloroethyl) phosphate, tris (chloropropyl) phosphate, tris (dichloropropyl) phosphate, and tris (tribromoneopentyl).
Phosphates, condensed phosphoric esters of the compounds with phenols, and the like.

Of these, non-halogen phosphates are more preferable, and in particular, triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl phenyl phosphate, xyenyl diphenyl phosphate having two or more aromatic rings. , 2-
Ethylhexyl diphenyl phosphate and condensed phosphoric esters of the compounds with phenols.
Particularly preferred are condensed phosphate esters of triphenyl phosphate and the above compounds with phenols. As an example of the condensed phosphoric acid ester, those shown in the following Chemical Formula 9 can be mentioned.

[0055]

Embedded image

The compounding amount of the phosphate in the present invention is 1 to 15% by volume. Phosphoric acid esters are intended to impart flame retardancy to the composition and to improve mechanical properties (strength). When the phosphoric acid ester is added in a large amount beyond the above-mentioned predetermined range, the heat resistance of the molded body is reduced, so that it is preferable. If the amount is less than the predetermined range, the desired flame retardancy cannot be obtained.

Next, the fluororesin used in the present invention is a polymer having a carbon chain in the main chain and a bond of a fluorine atom in a side chain, or a copolymer having such a polymer. Specific examples include polytetrafluoroethylene (hereinafter abbreviated as PTFE), tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (hereinafter abbreviated as PFA), and tetrafluoroethylene-.
Hexafluoropropylene copolymer (hereinafter abbreviated as FEP), ethylene-tetrafluoroethylene copolymer (hereinafter abbreviated as ETFE), tetrafluoroethylene-fluoroalkylvinyl ether-fluoroolefin copolymer (hereinafter abbreviated as FEP) EPE), an ethylene-trichlorofluoroethylene copolymer (hereinafter referred to as EPE).
Abbreviated as CTFE. ) And polyvinylidene fluoride (hereinafter abbreviated as PVDF). These may be used alone or in combination of two or more.

As the fluororesin, PTFE whose carbon chain is completely fluorinated is particularly preferable because of its excellent lubricity.
As commercially available PTFE, powder for molding and powder for dispersion can be used. In order to increase the mechanical strength of the resin composition of the present invention as much as possible, it is preferable that PTFE having a number average molecular weight of 1.5 million or more is contained in 2% or more of all PTFE. And the powder for dispersion have a number average molecular weight of 1.5 million or more.

The commercially available PTFE usable in the present invention is Teflon 7 manufactured by DuPont-Mitsui Fluorochemicals.
J, TLP-10, Aflon G163 manufactured by Asahi Glass Co., Ltd .: Polyflon M12, M15, Lubron L5 manufactured by Daikin Industries, Ltd., and Hostaflore TF9205 manufactured by Hoechst. Further, PTFE modified with an alkyl vinyl ether can also be used.

[0060] Commercially available PFA include Teflon PFA-J, MP manufactured by DuPont-Mitsui Fluorochemicals.
-10, manufactured by Hoechst: Hostaflon TFA, manufactured by Daikin Industries, Ltd .: Neoflon PFA.

Further, as commercial products of FEP, Mitsui
Examples include Teflon FEP-J manufactured by DuPont Fluorochemicals and NEOFLON NC manufactured by Daikin Industries.

[0062] Commercially available ETFE products include Mitsui
DuPont Fluorochemical: Tefzel, Asahi Glass:
Aflon COP.

Commercially available products of EPE include Teflon EPE-J manufactured by DuPont Fluorochemicals, Ltd.

Commercially available PVDF products include KF Polymer manufactured by Kureha Chemical Industry Co., Ltd., and HYLAR manufactured by Audimont Co., Ltd.

The mixing ratio of the above-mentioned fluororesin is 5 to 30% by volume. If the amount is less than the predetermined range, the desired degree of lubricity cannot be obtained, and if the amount is more than the predetermined range, the mechanical properties of a molded article such as a sliding bearing are significantly reduced, which is not preferable.

The flaky graphite (graphite) used in the invention of the present application has a hexagonal structure of natural graphite or artificial graphite, and has a flaky shape in which hexagonal mesh planes of carbon atoms are regularly laminated. is there. As commercially available flaky graphite, Nippon Graphite Co., Ltd .: ACP (fixed carbon amount 99.5%),
LONZA: KS-6 or KS-10 (fixed carbon amount 99.5%).

The proportion of such graphite in the heat-resistant and lubricating resin composition is 1 to 15% by volume. If the amount is less than the predetermined range, the effect of improving lubricity and abrasion resistance cannot be sufficiently obtained, and if the amount is more than the predetermined range, the molded product becomes brittle, which is not preferable.

The additives other than those described above include solid lubricants other than the above-mentioned fluororesins and graphite, antioxidants, oxidation stabilizers, ultraviolet absorbers, lubricants, antistatic agents, fillers, coloring agents, flame retardants and the like. And other resins and elastomers.

Solid lubricants include polyethylene and other polyolefin resins, polyethylene wax, molybdenum disulfide, carbon, mica, talc, molybdenum trioxide, silicon powder, bronze, copper-lead alloy powder, molybdenum powder, tungsten disulfide, Examples include wollastonite, metal oxide powder, calcium sulfate whiskers and other whiskers, aromatic polyester resins, carbonates, phosphates, stearates, boron nitride, and other well-known solid lubricants.

Examples of the coloring agent include titanium oxide, zinc sulfide, zinc oxide and the like. Representative examples of lubricants include mineral oil, silicone oil, ethylene wax, polypropylene wax, metal salts such as sodium and lithium stearate, metal salts such as sodium, lithium and zinc of montanic acid, and amides and esters of montanic acid. is there.

A flame retardant aid may be added to the resin composition of the present invention, and examples thereof include antimony, boron,
Zinc or iron compounds. Further, other additives include stabilizers such as sterically hindered phenols and phosphite compounds, and ultraviolet absorbers exemplified by oxalic acid diamide compounds and sterically hindered amine compounds.

The following fillers may be used alone or in combination of two or more, or may be used after being subjected to various surface treatments. That is, as such a filler, glass fiber, carbon fiber, calcium oxide, clay, calcined clay, silica, glass sphere, aramid fiber, alumina, magnesium oxide, calcium silicate, asbestos, sodium aluminate, sodium aluminosilicate , Magnesium silicate, aluminum hydroxide, calcium hydroxide, barium sulfate, potassium alum, sodium alum, iron alum, shirasu balloon, glass balloon, carbon black, coke breathe, zinc oxide, zinc oxide whisker, antimony trioxide, boric acid , Borax, zinc borate, metal powder, metal whisker, titanium oxide, titanium oxide whisker, glass beads, calcium carbonate, calcium carbonate whisker, zinc carbonate, hydrotalcite, iron oxide, potassium titanate ,
Examples include potassium titanate whiskers, asbestos, aluminum borate, aluminum borate whiskers, and graphite whiskers.

The resin composition for forming the heat-resistant and lubricating sliding bearing according to the present invention includes various resins other than the above-mentioned PAI and polyester resin and polymers such as rubber according to the performance required for the sliding bearing. May be added alone or in combination of two or more as long as the object of the present invention is not inhibited.

Specific examples of such a resin or polymer include polybutadiene, butadiene-styrene copolymer, acrylic rubber, ethylene-propylene polymer, EP
DM, modified EPDM, styrene-butadiene block copolymer, styrene-butadiene-styrene block copolymer, styrene-butadiene-styrene radial tereblock copolymer, polypropylene, butadiene-acrylonitrile copolymer, polyvinyl chloride, polycarbonate, Polyacetal, polyamide, polyester, epoxy resin, polyvinylidene fluoride, polysulfone, ethylene-vinyl acetate copolymer, polyisoprene, natural rubber, chlorinated butyl rubber, chlorinated polyethylene, polyphenylene sulfide (PPS) resin, polyether ketone resin , Polyether ether ketone resin, polyimide resin, polycyano aryl ether resin, polybenzimidazole resin, polyphenylene oxide (PPO) resin, styrene-meta Methyl copolymer acrylic acid, styrene - maleic anhydride copolymer, rubber-modified PPO resins, styrene - maleimide copolymer, rubber-modified styrene - maleimide copolymers.

Among them, particularly preferred is polycarbonate or polyphenylene sulfide (PPS) resin. Incidentally, a lubricant such as silicone oil or a heat-resistant oil may be added to the resin composition as necessary.

The method of adding and mixing the raw materials of the resin composition of the present invention is not particularly limited, and a general method widely used can be adopted. For example, the main component resin and other raw materials are dry-mixed individually or after mixing with a mixer such as a Henschel mixer, a ball mill, a tumbler mixer, etc., and then an injection molding machine or a melt extrusion molding having good melt mixing properties. Or a method in which the mixture is previously melt-mixed with a hot roll, kneader, Banbury mixer, melt extruder, or the like. Alternatively, a method may be adopted in which after the polyamideimide and the polyester resin and / or the phosphoric ester compound are melt-mixed in advance, other components are mixed and further melt-mixed.

Further, the resin composition of the present invention can be molded by a conventional method such as compression molding, extrusion molding, injection molding and the like.
Or after melt-mixing the composition, this is jet-milled,
It can be pulverized by a freezing pulverizer or the like and classified to a desired particle size, or can be subjected to fluid immersion coating, electrostatic powder coating or the like without classification. Further, the obtained powder can be dispersed in a solvent, and spray coating or dip coating can be performed.

The shape of the heat-resistant sliding bearing of the present invention formed from the above-mentioned material is not particularly limited, and may be a shape adapted to the shape of a heating / pressing roller in a fixing device or the like, a peripheral device, or a housing. Should be adopted.

For example, as shown in FIG. 1, the bearing may be formed not only of a single material but also of a composite material comprising the bearing portion 1 and the fixing metal portion 2 by employing a two-color molding technique. .

As shown in FIG. 2, the heat-resistant plain bearing according to the present invention comprises a bearing portion 3 and a synthetic resin such as PPS, polyamide imide (PAI), polyimide (PI) and the like having excellent heat resistance and heat insulation. Alternatively, the bearing may be a two-color molded bearing including the resin part 4 to which an inorganic filler or an organic filler is added.

Then, the formed sliding bearing is 100-
It is preferable to perform annealing heat treatment at 180 ° C. for about 0.5 to 24 hours to secure the dimensional stability during high-temperature use by removing distortion during molding.

[0082]

EXAMPLES Various raw materials used in Examples and Comparative Examples of the present invention are collectively shown as follows. The numbers in parentheses correspond to the numbers of the raw materials in the following table, and the mixing ratios of the components in the table are all% by volume. (1) Polyamideimide resin [PAI] (Starting from 50 mol% of trimellitic anhydride and 50 mol% of 2,4-tolylene diisocyanate as raw materials, first amidation and then imidation are carried out in N-methylpyrrolidone. (2) Polyamide imide resin [PAI] (Amidation is first performed using 18 mol% of trimellitic anhydride, 32 mol% of isophthalic acid, and 50 mol% of 2,4-tolylene diisocyanate as raw materials. And a polyamideimide resin copolymerized in N-methylpyrrolidone under the conditions of imidization), (3) polyethylene terephthalate resin [PET] (Aknight Plastics, Netherlands: Arnite A1)
60) (4) Polybutylene terephthalate resin [PBT] (manufactured by Mitsubishi Rayon Co., Ltd .: N1100C) (5) Polyphenylene sulfide resin [PPS] (manufactured by Toprene Co .: T4AG) (6) Polycarbonate resin [PC] (manufactured by Mitsubishi Gas Chemical Company) : Iupilon E2000) (7) Fluororesin [PTFE] (KTL: KTL)
610) (8) Fluororesin [PTFE] (manufactured by Dupont Fluorochemicals Mitsui: Teflon 7J) (9) Fluorine resin [ETFE] (Aflon COP manufactured by Asahi Glass Co.) (10) Flake graphite [GRP] (Lonza) Made: KS-
6) (11) Lithium phosphate: [Li ₃ PO ₄ ] (manufactured by Wako Pure Chemical Industries, Ltd .: reagent) (12) Aramid resin fiber [ARD] (manufactured by Nippon Aramid: Twaron Pulp 1097) (13) Glass fiber [ GF] (Chopped strand 03MA497, manufactured by Asahi Fiberglass Co., Ltd.) (14) Triphenyl phosphate [TPP] (manufactured by Daihachi Chemical) (15) Polyamide resin [PA] (6T nylon was grafted with maleic anhydride. A resin composition containing 20% by volume of high-density polyethylene, 7% of brominated polystyrene, 1% of antimony trioxide, and 3% of potassium iodide).

[Examples 1 to 8, Comparative Examples 1 to 4] The raw materials were blended in the proportions (volume%) shown in Table 1 and mixed with a Henschel mixer. The pellets are extruded and granulated under the conditions of melt mixing at a temperature of 180 to 300 ° C. and a rotation speed of 100 rpm, and the obtained pellets have a resin temperature of 180 to 310 ° C. and an injection pressure of 800 kgf / c.
m ² , an outer diameter of 2 under injection molding conditions of a mold temperature of 50 to 140 ° C.
A ring-shaped test piece having a size of 8 mm, an inner diameter of 20 mm, and a width of 5 mm was formed. Using this test piece, the following high temperature radial friction and wear test was performed.

[0084]

[Table 1]

[High-Temperature Radial Friction and Wear Test] A rotating shaft made of aluminum alloy A5056 (surface roughness 3.2S) was used as a mating member, and a ring-shaped test piece was fitted around the mating member.
This was pressed against the peripheral surface of the mating material at a pressure of 13 kgf / cm ² , the surface temperature of the rotating shaft was controlled to 160 ° C., and a torque meter was attached thereto, and the peripheral speed was 1.5 m.
/ Min for 50 or 250 hours.

Thereafter, the specific wear amount [× 10 ⁻⁸ mm ³ / (N · m)] as the wear amount of the test piece and the torque (N · cm) of the rotating shaft were measured, and the sliding partner material was measured. The degree of damage on the surface of the aluminum alloy was observed. The degree of damage was evaluated in three stages: no damage (し), slight damage (△), or damage (x). The results are shown in Table 2.

[Bending test] 12.7 mm × 12.7 mm
A test piece of × 3.2 mm was injection molded and subjected to a bending test at room temperature. The results are also shown in Table 2.

[Flame Retardancy Test] 12.7 mm × 12.7 m
A test piece of mx 3.2 mm was injection molded, and the flammability by UL94 was examined. The results are also shown in Table 2.

The flammability test method specified in UL94 includes a horizontal flammability test 94HB and a vertical flammability test 94V.
There are two test methods. Generally, 94V
UL94V-0 (hereinafter abbreviated as V-0) is the strictest certification standard.

[0090]

[Table 2]

As is clear from the results shown in Table 2, Comparative Examples 1 to 3 have a large coefficient of friction (rotation torque) and a large amount of specific wear. The damage of the partner material was also large. Comparative Example 1 is 50
The time test was measurable, but the 114 hour test resulted in excessive wear and the further test was stopped. In Comparative Example 2, the test was stopped 6 hours after the start of the test because the partner material was significantly damaged. In Comparative Examples 2 and 3, the flame retardancy is only an evaluation of HB. Comparative Example 4 has a flame retardancy of V
−0, and the friction and wear characteristics for 50 hours were excellent.
Evaluation for a test time of 250 hours was markedly inferior due to thermal degradation.

On the other hand, in Examples 1 to 8 satisfying all the conditions, both the specific wear amount and the friction coefficient were small, and the partner material (aluminum material: A5056) was not damaged at all.

[0093]

The heat-resistant and lubricating resin composition of the present invention comprises:
As described above, a resin composition containing a predetermined amount of a polyamideimide resin, a polyester resin, and a fluororesin having excellent self-lubricating properties is used, so that the resin composition is compared with a conventional engineering plastic used for a sliding bearing for a fixing device. High-performance heat- and lubricating resin composition with low friction characteristics (rotational torque), wear resistance and non-attacking property against soft alloys such as aluminum alloys under long-term sliding conditions. There is an advantage that it becomes a heat-resistant plain bearing.

In addition to the above-mentioned properties, the composition to which the phosphate compound is added becomes a resin composition having excellent flame retardancy, and has the advantage of being an excellent heat-resistant sliding bearing.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment.

FIG. 2 is a perspective view showing another embodiment.

FIG. 3 is a cross-sectional view illustrating a use state of a bearing in the heat fixing device.

FIG. 4 is a cross-sectional view illustrating a use state of a bearing in another heat fixing device.

[Explanation of symbols]

 1, 3 Bearing part 2 Fixing metal part 4 Resin part 10 Heating roller 11 Pressure roller 12 Heater 13, 14 Radial bearing made of synthetic resin 15 Fixing film 16 Ceramic heater 17 Guide roller

Claims (9)

[Claims] 1 to 5 to 65% by volume of a polyamideimide resin,
30 to 80% by volume of polyester resin and fluororesin 5
A heat-resistant / lubricating resin composition containing about 30% by volume. 2. The heat- and lubricating resin composition according to claim 1, wherein the fluororesin is polytetrafluoroethylene. 3. A heat-resistant / lubricating resin composition obtained by adding 1 to 15% by volume of flake graphite to the heat-resistant / lubricating resin composition according to claim 1 or 2. 4. A heat-resistant / lubricating resin composition comprising the heat-resistant / lubricating resin composition according to claim 1 and 1 to 15% by volume of a phosphoric ester compound. 5. A heat and lubricating resin composition comprising the heat and lubricating resin composition according to claim 3 and 1 to 15% by volume of a phosphoric ester compound. 6. A heat-resistant sliding bearing formed by molding the heat-resistant / lubricating resin composition according to claim 1. 7. A heat-resistant sliding bearing obtained by molding the heat-resistant and lubricating resin composition according to claim 3. 8. A heat-resistant sliding bearing formed by molding the heat-resistant and lubricating resin composition according to claim 4. 9. A heat-resistant slide bearing obtained by molding the heat-resistant / lubricating resin composition according to claim 5.