JP5263269B2 - Sliding member for peeling sheet-shaped recording material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sliding member for peeling a sheet-like recording material that has various types of functions required as the sliding member for peeling the sheet-like recording material such as a separation claw and a separation plate, and improves abrasion resistance and heat-resistant rigidity without forming a film. <P>SOLUTION: This sliding member for peeling the sheet-like recording material comprises: as a first component, adhesive fluorocarbon resin (A) that can be processed by injection molding, or a resin mixture having a volume ratio (A/B) 5/95-99/1 of the resin (A) to a fluorocarbon resin (B) that is different from the resin (A) and can be processed by injection molding; and as a second component, a resin composition including 0.5-50 vol.% thermoplastic polyimide (C). <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a sheet-like recording material peeling sliding member.

  The sheet-like recording material peeling sliding member is fixed in a fixing section or a developing section of various image forming apparatuses (hereinafter referred to as “copying machines”) using an electrophotographic method such as a copying machine, a laser beam printer, and a printing machine. It is used as a separation claw or separation plate for peeling a sheet-like recording material such as copy paper or printing paper from a roll such as a roll.

  The functions of the separation claw and separation plate include non-adhesiveness to which printing toner does not adhere, shape stability that prevents the tip of the separation claw from being deformed or damaged, and a roll that comes into contact with the leading edge. Non-aggressiveness to rolls that do not damage the surface, heat resistance that does not deform at a high temperature of about 200 to 250 ° C. especially for separation claws that contact a high-temperature fixing roll, quietness when sliding with the roll, etc. Is required.

  Conventionally, various proposals have been made as a sliding member for separating a sheet-like recording material such as a separation claw and a separation plate in order to satisfy the above-mentioned required performance. For example, a separation claw for a copying machine in which a non-tacky surface is improved by forming a film mainly composed of a specific fluorocarbon resin such as tetrafluoroethylene on the surface of a polyimide molded body having a specific structure (Patent Document 1) Separation nail for copying formed by forming a fluororesin fusion coating on the surface of a molded resin composition in which a specific ratio of reinforcing materials such as titanium oxide whisker and zinc oxide whisker is blended with polyetherketone resin (Patent Document) 2) and a separation claw for copying (Patent Document 3) injection-molded with a fluorine-based resin.

However, in the case of a separation nail or the like formed by forming a fluororesin molten film on the surface of a heat-resistant resin (also referred to as a base material) as described in Patent Documents 1 and 2, the above requirements are surely satisfied. However, from the viewpoint of the production process for forming a molten film of a fluororesin, there is a problem that it is necessary to use an expensive resin such as polyimide or polyether ketone having high heat resistance.
In addition, since a film is formed by melting a fluorine-based resin on the surface of a molded body such as polyimide at a high temperature of about 300 ° C., an additional coating process is required, and energy for high-temperature heating is required. Therefore, there is a problem that it is more costly and undesirable from the viewpoint of environmental load.
Furthermore, since resins such as polyimide generally have a high surface hardness, even if a film is formed on the surface with a fluorine-based resin, the surface hardness is high and there is a risk of damaging the roll surface with which the most advanced part contacts. In addition, there is a problem that the roll surface is remarkably damaged when the coating is worn or peeled off for some reason. Moreover, since the hardness of the coating surface is high, the quietness is not so good.
In addition, in the separation nail formed by forming a film on the surface of the base material, the formation of the film affects the performance of the separation nail. Because it is a process that tends to occur, a manned inspection is required. Therefore, there is a problem that it is expensive in terms of management for performing the inspection.

  In addition, as described in Patent Document 3, in the case of a separation nail for copying that is injection-molded with a fluorine-based resin, an expensive resin such as polyimide is not used and a film is not formed on the surface. Compared with the separation claw for copying described in 1 and 2, the cost and environmental load are improved. However, in the case of a separation claw for copying that is injection-molded with a fluorine-based resin, there are problems of high wear and low rigidity at high temperatures.

Japanese Patent Publication No. 8-16815 Japanese Patent No. 2902320 JP 2003-241557 A

  In view of the above problems, the object of the present invention is to have the above functions required as a sheet-like recording material peeling sliding member such as a separation claw and a separation plate, and without forming a film, It is an object of the present invention to provide a sliding member for peeling a sheet-shaped recording material having improved wear resistance and heat-resistant rigidity.

As a result of intensive studies for solving the above problems, the present inventors have found that the above problems can be solved by using an adhesive fluorocarbon resin and a thermoplastic polyimide, and have completed the present invention.
That is, the gist of the present invention is as follows.

In the present invention, as the first component,
Adhesive fluorocarbon resin (A) that can be injection molded, or
A resin mixture having a volume ratio (A / B) of 5/95 to 99/1 between the resin (A) and the injection-moldable fluorocarbon-based resin (B) different from the resin (A),
The present invention relates to a sheet-like recording material peeling sliding member comprising a resin composition containing 0.5 to 50% by volume of thermoplastic polyimide (C) as a second component.

  In the present invention, the resin composition preferably contains 0.1 to 30% by volume of at least one selected from the group consisting of a fibrous substance, a whisker-like substance, and a particulate substance as an additive. In the resin composition, the total of the volume ratios of the resin (A) or the resin mixture, the thermoplastic polyimide (C), and the additive is more preferably 100% by volume.

  In the present invention, the injection-moldable adhesive fluorocarbon resin (A) has at least one functional group selected from the group consisting of an acid anhydride group, a carboxy group, an acid halide group, and a carbonate group. It may be.

  In the present invention, the injection-moldable adhesive fluorocarbon resin (A) has a first repeating unit based on tetrafluoroethylene, a dicarboxylic anhydride group, and a polymerizable unsaturated group in the ring. A second repeating unit based on a cyclic hydrocarbon monomer having a third repeating unit based on another monomer, and the second repeating unit based on the total molar amount of the first repeating unit, the second repeating unit and the third repeating unit. Even a fluorine-containing copolymer having one repeating unit of 50 to 99.89 mol%, a second repeating unit of 0.01 to 5 mol%, and a third repeating unit of 0.1 to 49.99 mol% Good.

  Furthermore, in this invention, it is preferable that the average dispersed particle diameter of the said thermoplastic polyimide (C) is 10 micrometers or less.

  In the present invention, the water droplet contact angle on the surface of the sheet-like recording material peeling sliding member is preferably 90 ° or more.

  According to the present invention, it has the above functions such as non-adhesiveness, shape stability, non-aggressiveness, heat resistance, and quietness, which are required as a sliding member for separating a sheet-like recording material such as a separation claw and a separation plate. At the same time, it is possible to provide a sheet-shaped recording material peeling sliding member with improved wear resistance and heat-resistant rigidity without forming a film.

It is a perspective view which shows an example of embodiment of the sliding member for sheet-like recording material peeling of this invention. It is a perspective view which shows the other example of embodiment of the sliding member for sheet-like recording material peeling of this invention. It is explanatory drawing of the state with which the example of embodiment of the sliding member for sheet-like recording material peeling of this invention was mounted in the copying machine. It is explanatory drawing of the front-end | tip angle of the separation nail | claw which is an example of embodiment of the sliding member for sheet-like recording material peeling of this invention.

The sliding member for peeling a sheet-like recording material according to the present invention has an injection-moldable adhesive fluorocarbon resin (A) or an injection different from the resin (A) and the resin (A) as a first component. A resin mixture having a volume ratio (A / B) with the moldable fluorocarbon resin (B) of 5/95 to 99/1 is used as a second component, and the thermoplastic polyimide (C) is 0.5 to 50% by volume. It consists of a resin composition containing.
That is, in the present invention, the sheet-shaped recording material peeling sliding member may be configured using a resin composition containing the resin (A) as the first component and the thermoplastic polyimide (C) as the second component. A sheet-shaped recording material using a specific resin composition containing a resin mixture having a specific volume ratio of the resin (A) and the resin (B) as the first component and the thermoplastic polyimide (C) as the second component A peeling sliding member may be configured. However, in any case, the content of the thermoplastic polyimide (C) in the resin composition is 0.5 to 50% by volume by volume ratio.

  Thus, since the sliding member for sheet-like recording material peeling according to the present invention contains thermoplastic polyimide (C), it has excellent heat resistance and high mechanical strength based on its characteristics (that is, Since it contains the resin (A) (if necessary, the resin (B)) together with the form stability and heat resistance, it has excellent chemical resistance (that is, non-adhesiveness) based on the characteristics of the fluorocarbon resin. ) And moderate flexibility (ie, quietness). Further, unlike the conventional fusion coating, not only the surface but also the whole is made of the resin composition, so that it is possible to suppress the aggressiveness to the roll.

The adhesive fluorocarbon resin (A) that can be injection-molded can be used without particular limitation as long as it can be used for injection molding and is compatible with the thermoplastic polyimide (C). Here, “adhesiveness” includes compatibility or affinity with resins including thermoplastic polyimide (C), resins other than resin (A), and other materials.
Such adhesive fluorocarbon resin has the characteristics such as moderate flexibility, excellent heat resistance, chemical resistance, weather resistance, gas barrier property, etc. possessed by the fluorocarbon resin, and has a moderate surface free energy. Since it becomes high, it becomes possible to comprise resin compositions, such as a polymer alloy combined with another material. Therefore, a resin composition having both excellent properties such as heat resistance and mechanical strength of the thermoplastic polyimide and the excellent properties of the fluorocarbon resin as in the present invention can be obtained.

  As the base fluororesin constituting the adhesive fluororesin, for example, a fluororesin including a repeating unit based on tetrafluoroethylene (TFE) can be preferably used. Specifically, as this base fluororesin, for example, tetrafluoroethylene-perfluoro (alkyl vinyl ether) copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), ethylene-tetrafluoro One selected from the group consisting of ethylene copolymer (ETFE), chlorotrifluoroethylene (CTFE) -TFE copolymer and the like can be preferably used alone or in a blend of two or more. From the viewpoints of adhesiveness and non-adhesiveness, PFA can be preferably used.

  The injection-moldable adhesive fluorocarbon resin (A) (hereinafter sometimes referred to as an adhesive fluororesin) is, for example, from the group consisting of an acid anhydride group, a carboxyl group, an acid halide group, and a carbonate group. Examples thereof include a fluororesin having at least one selected functional group. Thereby, compatibility with thermoplastic polyimide can be improved more. Therefore, phase separation from thermoplastic polyimide hardly occurs, and overall wear resistance and heat resistance rigidity can be imparted.

  Further, as the acid anhydride group contained in the adhesive fluororesin, an unsaturated carboxylic acid anhydride group can be preferably used, and in particular, a dicarboxylic acid anhydride group can be preferably used. A bonded dicarboxylic anhydride group can be preferably used.

  As the acid anhydride group, a repeating unit based on a cyclic hydrocarbon monomer having a polymerizable unsaturated group and a dicarboxylic anhydride group in the ring (hereinafter referred to as “cyclic monomer”) can be preferably used. In this case, the adhesive fluororesin includes, for example, a first repeating unit based on tetrafluoroethylene, a second repeating unit based on a cyclic hydrocarbon monomer having a dicarboxylic anhydride group and having a polymerizable unsaturated group in the ring. Those having a unit and a third repeating unit based on other monomers excluding tetrafluoroethylene and the cyclic hydrocarbon monomer (hereinafter referred to as “addition monomer”) can be preferably used.

  Moreover, as this adhesive fluororesin, the said 1st repeating unit is 50-99.89 mol% with respect to the total molar amount of said 1st repeating unit, 2nd repeating unit, and 3rd repeating unit. Yes, those in which the second repeating unit is 0.01 to 5 mol% and the third repeating unit is 0.1 to 49.99 mol% can be preferably used. When the mol% of the first repeating unit, the second repeating unit, and the third repeating unit are within the above ranges, the adhesive fluororesin has heat resistance, chemical resistance, adhesiveness, moldability, Excellent mechanical properties. Furthermore, as this adhesive fluororesin, the first repeating unit is 60 to 99.45 mol%, the second repeating unit is 0.05 to 3 mol%, and the third repeating unit is 0.5 to 45 mol%. More preferably, the first repeating unit is 80 to 98.9 mol%, the second repeating unit is 0.1 to 1 mol%, and the third repeating unit is 1 to 40. Most preferred are those in mole percent.

  The cyclic monomer constituting this adhesive fluororesin is a polymerizable having one or more cyclic hydrocarbons consisting of a 5-membered ring or a 6-membered ring, a dicarboxylic anhydride group, and an intra-ring polymerizable unsaturated group. Compounds are preferred. As this cyclic monomer, one having a cyclic hydrocarbon having one or more bridged polycyclic hydrocarbons can be preferably used, and in particular, a cyclic hydrocarbon composed of one bridged polycyclic hydrocarbon, two or more Those having a cyclic hydrocarbon condensed with a bridged polycyclic hydrocarbon or a cyclic hydrocarbon condensed with a bridged polycyclic hydrocarbon and another cyclic hydrocarbon can be preferably used. Moreover, as this cyclic monomer, those having an intra-ring polymerizable unsaturated group containing one or more polymerizable unsaturated groups present between carbon atoms constituting the hydrocarbon ring can be preferably used. In addition, as the cyclic monomer, a dicarboxylic anhydride group (—CO—O—CO—) bonded to two carbon atoms constituting the hydrocarbon ring or bonded to two carbon atoms outside the ring is used. What has is preferably used.

  Specifically, examples of the cyclic monomer include 5-norbornene-2,3-dicarboxylic acid anhydride (hereinafter referred to as “NAH”) and acid anhydrides represented by the following formulas (1) to (3). Etc. can be preferably used, and NAH can be particularly preferably used. In addition, by using the above-mentioned cyclic monomer, an adhesive fluororesin containing a repeating unit composed of the cyclic monomer can be easily produced without using a special polymerization method.

Examples of the additional monomer constituting the adhesive fluororesin include, for example, vinyl fluoride, vinylidene fluoride (hereinafter referred to as “VdF”), chlorotrifluoroethylene (hereinafter referred to as “CTFE”), trifluoroethylene, hexa Fluoropropylene (hereinafter referred to as “HFP”), CF ₂ ═CFOR ^f1 which is a perfluoroalkyl vinyl ether (where R ^f1 is a perfluoroalkyl group having 1 to 10 carbon atoms and may contain an oxygen atom between carbon atoms), CF ₂ = CFOR ^f2 SO ₂ X ¹ (R ^f2 is a perfluoroalkylene group having 1 to 10 carbon atoms and may contain an oxygen atom between carbon atoms, X ¹ is a halogen atom or a hydroxyl group), CF ² = CFOR ^f2 CO ₂ X ² (wherein, R ^f2 is also good perfluoroalkylene group contain an oxygen atom between carbon atoms at 1 to 10 carbon atoms, ² is a hydrogen atom or an alkyl group having 1 to 3 carbon _{atoms), CF 2 = CF (CF} 2) p OCF = CF 2 ( wherein, p is 1 or ^{_{2), CH 2 = CX 3}} (CF 2) q X ⁴ (wherein X ³ and X ⁴ are each independently a hydrogen atom or a fluorine atom, q is an integer of 2 to 10), perfluoro (2-methylene-4-methyl-1,3-dioxolane), ethylene, propylene , One selected from the group consisting of olefins having 2 to 4 carbon atoms such as isobutene can be used alone or in combination of two or more.

Specifically, as the additional monomers include, for example, VdF, HFP, CTFE, CF 2 = CFOR f1, CH 2 = CX 3 (CF 2) q X 4, and one or more selected from the group consisting of ethylene Preferably, one containing at least one selected from the group consisting of HFP, CTFE, CF ₂ ═CFOR ^f1 , ethylene and CH ₂ ═CX ³ (CF ₂ ) _q X ⁴ is used. Particularly preferred are HFP, CTFE and CF ₂ = CFOR ^f1 . Then, as the additional monomer, most preferably CF ₂ = CFOR ^f1. In this case, the R ^f1, preferably perfluoroalkyl group having 1 to 6 carbon atoms, more preferably a perfluoroalkyl group having 2 to 4 carbon atoms, perfluoropropyl group is most preferred.

  Moreover, as an adhesive fluororesin, that whose melting | fusing point exists in the range of 150-320 degreeC can be used preferably, and what is in the range of 200-310 degreeC can be used preferably especially. Melting point Adhesive fluororesin in this range has heat resistance such as polyphenylene sulfide (PPS), polyimide (PI), polyether ether ketone (PEEK), liquid crystalline polymer (LCP), semi-aromatic polyamide. It is suitable for melting and kneading a polymer alloy with a super engineering plastic having a temperature of 150 ° C. or higher at a high temperature, and is excellent in melt moldability. Note that the melting point of the adhesive fluororesin can be appropriately adjusted depending on the content ratio of each repeating unit contained in the adhesive fluororesin.

  Further, as the adhesive fluororesin, the first repeating unit based on TFE is 50 to 99.89 mol%, the second repeating unit is 0.01 to 5 mol%, and the third repeating unit based on CTFE is 0. It is also possible to use a fluororesin that is from .1 to 49.99 mol%.

  The method for producing the adhesive fluororesin is not particularly limited, and a radical polymerization method using a radical polymerization initiator is used. Polymerization methods include bulk polymerization, solution polymerization using organic solvents such as fluorinated hydrocarbons, chlorinated hydrocarbons, fluorinated chlorohydrocarbons, alcohols, hydrocarbons, aqueous media, and appropriate organic solvents as required. Suspension polymerization, emulsion polymerization using an aqueous medium and an emulsifier, and solution polymerization is particularly preferable.

The radical polymerization initiator is preferably a radical polymerization initiator having a half-life of 10 hours and a temperature of 0 ° C to 100 ° C. More preferably, it is 20-90 degreeC. Specific examples thereof include azo compounds such as azobisisobutyronitrile, non-fluorinated diacyl peroxides such as isobutyryl peroxide, octanoyl peroxide, benzoyl peroxide, lauroyl peroxide, diisopropyl peroxydicarbonate, di-n-propyl. Peroxydicarbonates such as peroxydicarbonate, peroxyesters such as tert-butylperoxypivalate, tert-butylperoxyisobutyrate, tert-butylperoxyacetate, (Z (CF ₂ ) _r COO) ₂ (where Z is A hydrogen atom, a fluorine atom or a chlorine atom, and r is an integer of 1 to 10.) Inorganic peroxide such as fluorine-containing diacyl peroxide, potassium persulfate, sodium persulfate, ammonium persulfate, etc. Product, and the like.

  In the present invention, it is also preferable to use a chain transfer agent in order to control the melt flow rate (MFR) of the fluorinated copolymer. Chain transfer agents include alcohols such as methanol and ethanol, chlorofluorohydrocarbons such as 1,3-dichloro-1,1,2,2,3-pentafluoropropane, 1,1-dichloro-1-fluoroethane, Hydrocarbons such as pentane, hexane, and cyclohexane are listed. Examples of the chain transfer agent for introducing an adhesive functional group to the polymer terminal of the fluorinated copolymer include acetic acid, acetic anhydride, methyl acetate, ethylene glycol, propylene glycol and the like.

  In the present invention, the polymerization conditions are not particularly limited, and the polymerization temperature is preferably 0 to 100 ° C, more preferably 20 to 90 ° C. The polymerization pressure is preferably from 0.1 to 10 MPa, more preferably from 0.5 to 3 MPa. The polymerization time is preferably 1 to 30 hours.

  The adhesive fluororesin obtained by the above production method can be obtained in the form of pellets, powders, or other forms according to a conventional method.

  The injection-moldable fluorocarbon resin (B) is not particularly limited as long as it is an injection-moldable fluorocarbon resin other than the injection-moldable adhesive fluorocarbon resin (A). It is possible to use a known injection-moldable fluorocarbon-based resin, for example, one selected from the group consisting of PFA, FEP, ETFE, CTFE-TFE copolymer, etc., alone or a blend of two or more. it can.

The resin mixture has a volume ratio (A / B) of 5/95 to 99/1 between the resin (A) and an injection moldable fluorocarbon resin (B) different from the resin (A), Preferably it is 15 / 85-90 / 10, More preferably, it is 20 / 80-85 / 15. Thereby, compatibility with thermoplastic polyimide (C) is obtained. When the volume ratio (A / B) is less than 5/95, desired compatibility tends to be not obtained.
The volume ratio of the resin mixture is calculated from the mass ratio and specific gravity of each component.

  The method for producing the resin mixture is not particularly limited, and a method used for general resin mixing, for example, biaxial kneading, powder dry blending, or the like can be employed.

  There is no limitation in particular as said thermoplastic polyimide (C), A well-known thing and a commercially available thing can be used. Examples of commercially available products include Aurum PD-500 manufactured by Mitsui Chemicals.

  The resin composition contains 0.5 to 50% by volume of the thermoplastic polyimide (C). Thereby, heat-resistant rigidity and abrasion resistance improve. If the content of the thermoplastic polyimide (C) is less than 0.5% by volume, the heat resistance rigidity and wear resistance cannot be improved. If it is greater than 50% by volume, the fluidity and surface properties during injection molding deteriorate. Also, non-tackiness tends to decrease. Moreover, when using the additive mentioned later, 0.5-30 volume% may be sufficient in consideration of fluidity | liquidity ensuring at the time of injection molding, heat-resistant rigidity, and abrasion resistance.

In the resin composition, the thermoplastic polyimide (C) preferably has an average dispersed particle size of 10 μm or less. In this case, a thermoplastic polyimide (C) is appropriately dispersed in the resin (A) or the resin mixture, and a sheet-like recording material peeling sliding member with improved wear resistance and heat-resistant rigidity is obtained. .
The average dispersed particle diameter can be measured with a scanning electron microscope.

  In the present invention, the resin composition contains at least one selected from the group consisting of a fibrous substance, a whisker-like substance, and a particulate substance (hereinafter sometimes referred to as a specific additive) as an additive. You may comprise. Thereby, heat-resistant rigidity and abrasion resistance improve. These can be selected as appropriate in consideration of the reinforcing effect, wear resistance, and fluidity during injection molding.

  Examples of the fibrous substance include inorganic and organic fibrous substances. Examples of inorganic fibrous materials include metal fibers such as carbon fibers, glass fibers, graphite fibers, and stainless fibers. Examples of organic fibrous materials include various synthetic fibers and natural fibers. Among these, carbon fibers and organic fibers are preferable from the viewpoints of wear resistance and non-aggression.

  The whisker-like substance is a needle-like (basket-like) single crystal or polycrystal, and the crystal has a mean diameter of 0.01 to 10 μm. As such whisker-like substances, inorganic and organic whisker-like substances can be used. As the inorganic whisker-like substance, for example, calcium silicate whisker, calcium carbonate whisker, calcium sulfate whisker, magnesium sulfate whisker, magnesium nitrate whisker, aluminum borate whisker, titanium oxide whisker, zinc oxide whisker, potassium titanate whisker, Wollast Knight Whisker etc. are mentioned. Of these, calcium carbonate whisker and potassium titanate whisker are preferred from the viewpoints of wear resistance and non-aggression.

  As the particulate matter, organic or inorganic particulate matter having a particle diameter of 0.5 to 100 μm can be used. Examples of the inorganic type include talc, mica, montmorillonite, silica, and calcium carbonate. Examples of the organic type include aramid powder of wholly aromatic polyamide. Of these, talc and calcium carbonate are preferred from the viewpoints of wear resistance, non-aggression, and cost.

  Moreover, as a content rate of the said additive (specific additive) in the said resin composition, it is 0.1-30 volume% from a heat resistant rigidity, abrasion resistance, and a fluidity | liquidity at the time of injection molding. Preferably, it is 3 to 20% by volume.

  Moreover, in this invention, you may use additives other than said specific additive in the range which does not prevent the effect of this invention to the said resin composition. Such additives include mold release agents, lubricants, heat stabilizers, antioxidants, UV absorbers, crystal nucleating agents, foaming agents, rust inhibitors, ion trap agents, flame retardants, flame retardant aids, dyes -One or more kinds of colorants such as pigments and antistatic agents are included.

  In this invention, in the said resin composition, it comprises so that the sum total of each volume ratio of the said resin (A) or the said resin mixture, the said thermoplastic polyimide (C), and the said specific additive may be 100 volume%. Also good.

  Furthermore, it is preferable that the sheet-like recording material peeling sliding member according to the present invention has a water droplet contact angle of 90 ° or more on the surface thereof. In this case, non-adhesiveness of the toner to the sheet-like recording material peeling sliding member is further improved.

  The method for producing the resin composition used in the present invention is not particularly limited, and a method used for mixing ordinary resins, for example, biaxial kneading, dry blending of powder, and the like can be employed. Moreover, as a final form of a resin composition, it can be set as the general form of resin, such as a pellet, strand, powder, a paste.

  The sheet-like recording material peeling sliding member according to the present invention can be obtained by integrally molding the whole by injection molding or the like using the above resin composition. Therefore, the process for forming the fusion coating is not required, and the manufacturing process can be simplified and the environmental load can be reduced as compared with the case where the conventional fusion coating is formed. In addition, since injection molding can be performed, there is an advantage of excellent mass productivity.

  The sheet-like recording material peeling sliding member made of the resin composition as described above is used, for example, in a fixing unit or a developing unit of a copying machine, from a roll such as a fixing roll to a sheet-like recording material such as copying paper or printing paper. It can be suitably used as a sliding member such as a separation claw or separation plate to be peeled off.

An embodiment of a sliding member for peeling a sheet-like recording material according to the present invention will be described in the case of a separation claw for a copying machine.
In the present invention, the shape of the separation claw for the copying machine is not particularly limited, and may basically be the same shape as a conventional separation claw.
The separation claw for a copying machine of the present embodiment is integrally formed of the resin composition as a whole. For example, as shown in FIG. 1, the support shaft 2 is integrally formed with the separation claw 1. Alternatively, for example, as shown in FIG. 2, the separation claw 1a is provided with a shaft hole 2a. As shown in FIG. 3, the separation claw 1 is rotatable about the support shaft 2 with the rotation shaft 11 of the fixing roll or other roll 10 and the support shaft 2 in parallel. The separation claw 1a is inserted into the mounting shaft 4 provided in parallel with the rotating shaft 11 of the roll 10 through the shaft hole 2a so as to be rotatable around the mounting shaft 4, and a biasing means 3 such as a spring. Thus, the claw tip is attached to the surface of the roll 10 with an appropriate pressure.

  For example, as shown in FIG. 4, when the roll 10 and the separation claw 1 are brought into contact with a normal use state, the separation claw 1 on the side that comes into contact with the roll 10 when viewed from the rotating shaft 11 side of the roll 10. If the angle θ formed by the ridge line L1 of the separation claw and the ridge line L2 of the separation claw 1 on the side through which the copy paper P passes is the tip angle of the separation claw, the tip angle of the separation claw is preferably in the range of 5 to 80 degrees. A range of 45 degrees is more preferable. When the tip angle is 5 degrees or less, although depending on the pressing force against the roll, a gap is formed between the roll and the separation claw tip due to the bending deformation, and the paper jam easily occurs when the paper is passed. On the other hand, when the tip angle is 80 degrees or more, bending deformation is unlikely to occur, but the copy paper separating function is hardly exhibited.

(Production Example) Production of injection-moldable adhesive fluorocarbon resin (A) NAH (anhydrous acid mixed acid, manufactured by Hitachi Chemical Co., Ltd.) is used as a monomer having an acid anhydride group, and CF ₂ = CFO (as an additional monomer). CF ₂ ) ₃ F (perfluoropropyl vinyl ether, manufactured by Asahi Glass Co., Ltd.) (hereinafter referred to as PPVE) was used to produce an injection-moldable adhesive fluorocarbon resin (A) (adhesive fluororesin).

  First, 369 kg of 1,3-dichloro-1,1,2,2,3-pentafluoropropane (AK225cb, manufactured by Asahi Glass Co., Ltd.) (hereinafter referred to as “AK225cb”) and 30 kg of PPVE were previously deaerated. Moreover, it charged in the superposition | polymerization tank with a stirrer whose internal volume is 430L. Next, the inside of the polymerization tank was ripened and heated to 50 ° C., and further charged with 50 kg of TFE, the pressure in the polymerization tank was increased to 0.89 MPa / G.

  Furthermore, as a polymerization initiator solution, a solution in which (perfluorobutyryl) peroxide was dissolved in AK225cb at a concentration of 0.36% by mass was prepared, and 3 L of the solution was added to the polymerization tank at a rate of 6.25 mL per minute. Polymerization was carried out while continuously adding. Further, TFE was continuously charged so that the pressure in the polymerization tank during the polymerization reaction was maintained at 0.89 MPa / G. A solution in which NAH was dissolved in AK225cb at a concentration of 0.3% by mass was continuously charged in an amount corresponding to 0.1 mol% with respect to the number of moles of TFE charged during the polymerization.

  8 hours after the start of polymerization, when 32 kg of TFE was charged, the temperature in the polymerization tank was lowered to room temperature, and the pressure was purged to normal pressure. The obtained slurry was solid-liquid separated from AK225cb, and then dried at 150 ° C. for 15 hours to obtain 33 kg of an adhesive fluororesin. Moreover, the specific gravity of the obtained adhesive fluororesin was 2.15.

From the results of melt NMR analysis and infrared absorption spectrum analysis, the copolymer composition of this adhesive fluororesin (sometimes abbreviated as m-PFA) is determined to be a repeating unit based on TFE (first repeating unit) / NAH. The recurring unit based on (second repeating unit) / the repeating unit based on PPVE (third repeating unit) = 97.9 / 0.1 / 2.0 (mol%). Further, the melting point of this adhesive fluororesin (m-PFA) was 300 ° C., and the melt flow rate (MFR) was 0.39 mm ³ / sec.

(Examples and comparative examples)
As an injection-moldable adhesive fluorocarbon resin (A), m-PFA produced in the production example, as an injection-moldable fluorocarbon resin (B), Asahi Glass Co., Ltd. PFA (product name “Fluon (registered trademark) PFA” P-62XP ”, specific gravity (ρ) 2.15), as thermoplastic polyimide (C), TPI manufactured by Mitsui Chemicals, Inc. (product name“ AURUM (registered trademark) PD-500 ”, specific gravity (ρ) 1.33) , Carbon fiber (specific gravity (ρ) 1.7), glass fiber (specific gravity (ρ) 2.5), calcium carbonate whisker (specific gravity (ρ) 2.8) as an additive (specific additive), A resin composition having a volume-based composition shown in No. 1 (Table 2 shows a mass-based composition) was prepared by a twin-screw kneading extruder according to a conventional method to obtain pellets. Using the obtained resin composition, a sheet-like recording material peeling sliding member (injection molded product) as an evaluation sample was molded by injection molding according to a conventional method.

(Reference example)
Similarly to the examples and comparative examples, pellets of the resin composition having the composition shown in Table 1 (Table 2) were obtained. A sheet-like recording material peeling slide member in which a PFA fusion coating was formed on the surface of the sheet-like recording material peeling slide member injection-molded by using the obtained resin composition was prepared.

(Evaluation)
The following items were evaluated using injection-molded articles prepared in Examples and the like (reference examples were those after film formation; the same applies hereinafter). The evaluation results are shown in Table 3.

<Appearance of injection molded products>
The surface appearance of the injection-molded product prepared in Examples and the like was visually observed. The evaluation criteria are as follows.
○: No surface peeling ×: With surface peeling

<Measurement of average dispersed particle diameter of TPI>
Using the injection molded products prepared in Examples and Comparative Examples, the injection molded products immersed in liquid nitrogen and frozen were frozen and cut with a scanning electron microscope (SEM) (manufactured by Hitachi High-Technologies Corporation, S-3400N). Observing, the particle diameter of TPI was measured using the length measurement function attached to the SEM.

<Measurement of flexural modulus at 25 ° C.>
A bending test at 25 ° C. was performed in accordance with JIS K7203 using the injection molded product prepared in Examples and the like.

<Measurement of flexural modulus at 200 ° C>
A bending test at 200 ° C. was performed in accordance with JIS K7203 using the injection-molded article prepared in Examples and the like.

<Sliding with stainless steel: measurement of specific wear at 25 ° C.>
Using the injection-molded product prepared in Examples etc., the specific wear amount at 25 ° C. with respect to stainless steel was measured with a pin-on-disk friction and wear tester under the conditions shown in Table 4 (however, the temperature of stainless steel was 25 ° C.). did. Stainless steel was adopted because it is a common material for confirming the frictional wear characteristic difference between materials.

<Sliding with stainless steel: measurement of specific wear at 200 ° C.>
Using the injection-molded product prepared in Examples, etc., the specific wear amount at 200 ° C. with respect to stainless steel was measured with a pin-on-disk friction wear tester under the conditions shown in Table 4 (however, the temperature of stainless steel was 200 ° C.). did.

<Sliding with stainless steel: Evaluation of opponent attack (non-attack)>
Using the injection-molded product prepared in Examples and the like, the aggressiveness of the injection-molded product against stainless steel was evaluated by a pin-on-disk friction and wear tester under the conditions shown in Table 4 (however, the temperature of stainless steel was 25 ° C.). . The evaluation criteria are as follows.
○: Damage depth of stainless steel 2 μm or less △: Damage depth of stainless steel greater than 2 μm, 10 μm or less

<Sliding with PFA: Measurement of specific wear at 200 ° C.>
Using the injection-molded article prepared in Examples and the like, the specific wear amount at 200 ° C. with respect to PFA was measured with a pin-on-disk friction and wear tester under the conditions shown in Table 4 (where the temperature of PFA was 200 ° C.). Since the surface of the roll is generally coated with PFA, it was adopted.

<Sliding with PFA: Measurement of wear coefficient at 200 ° C.>
Using the injection-molded articles prepared in Examples and the like, the wear coefficient at 200 ° C. with respect to PFA was measured with a pin-on-disk friction wear tester under the conditions shown in Table 4 (where the temperature of PFA was 200 ° C.).

<Sliding with PFA: Evaluation of opponent aggression (non-aggression)>
Using the injection-molded product prepared in Examples and the like, the aggressiveness of the injection-molded product against PFA was evaluated by a pin-on-disk friction and wear tester under the conditions shown in Table 4 (however, the temperature of PFA was 25 ° C.). The evaluation criteria are as follows.
○: Damage depth of PFA is 30 μm or less Δ: Damage depth of PFA is larger than 30 μm and 100 μm or less

<Measurement of water droplet contact angle>
Using the injection-molded product prepared in Examples and the like, the water droplet contact angle on the surface was measured by an automatic contact angle meter (manufactured by Kyowa Interface Chemical Co., Ltd., FACE automatic contact angle meter CA-Z type).

<Heat deformation characteristics>
Using an injection-molded article prepared in Examples and the like, a load of 1.96 N was applied to an edge portion having a thickness of 2.5 mm, a tip angle of 45 °, and a tip R of 0.05 mm on a 200 ° C. stainless steel disk. By measuring the dimension in the load direction after 2 hours and calculating the dimensional difference (deformation amount) before and after the test, the thermal deformation characteristics were evaluated. The evaluation criteria are as follows.
A: Deformation amount is less than 0.05 mm B: Deformation amount is 0.05 mm or more and less than 0.15 mm Δ: Deformation amount is 0.15 mm or more

<Material cost>
The material cost was evaluated about the Example, the comparative example, and the reference example. The evaluation criteria are as follows.
A: kg unit price of PFA injection molding material ○: less than 4 times the unit cost of kg of PFA injection molding material

<Ease of process>
The ease of process was evaluated about the Example, the comparative example, and the reference example. The evaluation criteria are as follows.
○: Without coating process △: With coating process

<Product cost>
Among the above evaluation items, in terms of material cost and ease of process, each evaluation standard is rated as 2 points, ○ as 1 point, and Δ as 0 point, and the sum of both scores is 3 to 4 points. The product cost was evaluated with ◎ as the product, ◯ as the 2 points, and △ as the 0 to 1 points.

  In Comparative Example 2, as for the surface appearance of the injection molded product, surface peeling was observed, and in measuring the average dispersed particle diameter of TPI, poor dispersion was observed in the SEM image.

1, 1a Separation claw for copying machine 2 Support shaft 2a Shaft hole 3 Energizing means 4 Mounting shaft 10 Roll 11 Rotating shaft P Copy paper θ Tip angle

Claims (7)

As the first component,
Adhesive fluorocarbon resin (A) that can be injection molded, or
A resin mixture having a volume ratio (A / B) of 5/95 to 99/1 between the resin (A) and the injection-moldable fluorocarbon-based resin (B) different from the resin (A),
A sheet-like recording material peeling sliding member comprising a resin composition containing 0.5 to 50% by volume of thermoplastic polyimide (C) as a second component.   The sheet-like recording material peeling according to claim 1, wherein the resin composition contains 0.1 to 30% by volume of at least one selected from the group consisting of a fibrous substance, a whisker-like substance, and a particulate substance as an additive. Sliding member.   3. The sheet-shaped recording material peeling sheet according to claim 2, wherein in the resin composition, the total volume ratio of the resin (A) or the resin mixture, the thermoplastic polyimide (C), and the additive is 100% by volume. Sliding member.   The injection-moldable adhesive fluorocarbon-based resin (A) has at least one functional group selected from the group consisting of an acid anhydride group, a carboxy group, an acid halide group, and a carbonate group. The sliding member for peeling a sheet-like recording material according to claim 1.   The injection-moldable adhesive fluorocarbon resin (A) is a cyclic hydrocarbon monomer having a first repeating unit based on tetrafluoroethylene, a dicarboxylic anhydride group, and a polymerizable unsaturated group in the ring. A second repeating unit based on the second repeating unit and a third repeating unit based on another monomer, and the first repeating unit is 50 to 50% of the total molar amount of the first repeating unit, the second repeating unit and the third repeating unit. The fluorine-containing copolymer according to any one of claims 1 to 4, which is 99.89 mol%, the second repeating unit is 0.01 to 5 mol%, and the third repeating unit is 0.1 to 49.99 mol%. 2. A sliding member for peeling a sheet-like recording material according to item 1.   The sheet-like recording material peeling sliding member according to any one of claims 1 to 5, wherein an average dispersed particle size of the thermoplastic polyimide (C) is 10 µm or less. The sliding member for peeling a sheet-like recording material according to any one of claims 1 to 6, wherein the water droplet contact angle on the surface is 90 ° or more.

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