JP2008050437A - Resin composition, resin-molded article, and housing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin composition providing a resin molded article having excellent elastic modulus, sliding properties and wear resistance. <P>SOLUTION: The resin composition contains a macromolecular compound originated from a plant, and carbon nanotube and/or fullerene. The resin molded article and the housing are obtained by molding the resin composition. The chance of the sliding is caused by the high-hardness carbon nanotube and/or fullerene present on the surface in a scattered state by being dispersed to provide the good sliding properties and wear resistance. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a resin composition, a resin molded body, and a housing.

  In recent years, plant-derived biomass materials (plant-derived polymer compounds) have been actively developed from the viewpoints of environmental issues such as global warming, oil depletion, and waste problems, and the concept of building a sustainable recycling society. It has been broken. For example, polylactic acid is attracting attention as a biomass material produced from cereals and the like without using any petroleum, and is used for applications such as agricultural sheets and household garbage bags.

However, biomass materials such as polylactic acid have problems such as being hard and brittle and having low heat resistance, and their uses have been limited to a very narrow range. Therefore, in order to improve such problems, a resin composition in which crystallization is promoted by adding a crystal nucleating agent or the like to polylactic acid to improve heat resistance (see, for example, Patent Document 1), biodegradation of polylactic acid, etc. A resin composition (for example, see Patent Document 2) in which kenaf fibers are mixed with a heat-resistant resin composition to improve heat resistance and elastic modulus has been proposed.
JP 2003-39428 A JP-A-2005-105245

  However, the resin molded body formed by using the resin composition described in Patent Documents 1 and 2 has high surface energy, insufficient slidability and wear resistance, and still has an elastic modulus. We have found that this is insufficient.

  The present invention has been made in view of the above-described problems of the prior art, and a resin composition capable of obtaining a resin molded article excellent in elastic modulus, slidability, and wear resistance, and uses the same. An object of the present invention is to provide a molded resin body and a casing.

  In order to achieve the above object, the present invention provides a resin composition comprising a plant-derived polymer compound and carbon nanotubes and / or fullerenes.

  In the resin composition of the present invention, a plant-derived polymer compound binds to carbon nanotubes and / or fullerenes that are high in hardness and cannot maintain the shape alone, so that the resin molded body obtained using the resin composition The surface area can be increased, the surface energy can be made sufficiently low, and the slidability, wear resistance and elastic modulus can be made excellent. In particular, the resin molded body obtained by using the above resin composition has a very good sliding property because the high hardness carbon nanotubes and / or fullerenes are dispersed and scattered on the surface, which causes a slip. And wear resistance can be obtained. Furthermore, since the resin composition contains carbon nanotubes and / or fullerenes excellent in heat resistance, the resulting resin molded body can have sufficient heat resistance.

  In the resin composition of the present invention, the plant-derived polymer compound is preferably an aliphatic polyester. When the plant-derived polymer compound is an aliphatic polyester, the mechanical properties of the obtained resin molded product can be further improved due to the balance with the hardness of the carbon nanotube and / or fullerene.

  In the resin composition of the present invention, it is preferable that the carbon nanotube and / or the fullerene has a carboxyl group. Thereby, the dispersibility of the carbon nanotube and / or fullerene in the plant-derived polymer compound can be improved, and the elastic modulus, slidability, and wear resistance of the obtained resin molded body can be further improved. .

  Furthermore, in the resin composition of the present invention, the content of the plant-derived polymer compound is preferably 20 to 90% by mass based on the total amount of the resin composition. When the content of the plant-derived polymer compound is within the above range, it is possible to sufficiently improve the wear resistance, slidability and elastic modulus of the obtained resin molded article while sufficiently reducing the environmental load. .

  The present invention also provides a resin molded article containing a plant-derived polymer compound and carbon nanotubes and / or fullerenes. According to such a resin molded product, the slidability, the wear resistance, and the elastic modulus can be excellent as in the above-described resin composition of the present invention. Moreover, this resin molding can obtain sufficient heat resistance.

  In the resin molded body, the plant-derived polymer compound is preferably an aliphatic polyester. When the plant-derived polymer compound is an aliphatic polyester, the mechanical properties of the resin molded body can be further improved due to the balance with the hardness of the carbon nanotube and / or fullerene.

  Moreover, in the said resin molding, it is preferable that the said carbon nanotube and / or the said fullerene are what has a carboxyl group. Thereby, the dispersibility of the carbon nanotube and / or fullerene in the plant-derived polymer compound can be improved, and the elastic modulus, slidability, and wear resistance of the resin molded body can be further improved.

  Furthermore, in the resin molded body, the content of the plant-derived polymer compound is preferably 20 to 90% by mass based on the total amount of the resin molded body. When the content of the plant-derived polymer compound is within the above range, it is possible to sufficiently improve the wear resistance, slidability, and elastic modulus of the resin molded body while sufficiently reducing the environmental load.

  The present invention also provides a resin molded product obtained by molding the above-described resin composition of the present invention. According to such a resin molding, since it is molded using the resin composition of the present invention, the elastic modulus, slidability and wear resistance can be achieved at a high level. Moreover, the said resin molding can acquire sufficient heat resistance.

  Moreover, it is preferable that the resin molding of this invention mentioned above is an office equipment part. The resin molded body of the present invention is very useful as an office equipment part because all of the elastic modulus, slidability and wear resistance can be achieved at a high level.

  The present invention also provides a housing characterized in that the resin molded body of the present invention described above is used in part or in whole. Since the resin molded body of the present invention is used for a part or all of such a casing, all of the elastic modulus, slidability and wear resistance can be achieved at a high level, and the heat resistance is also sufficient. Can be.

  ADVANTAGE OF THE INVENTION According to this invention, the resin composition which can obtain the resin molding excellent in the elasticity modulus, slidability, and abrasion resistance, and the resin molding and housing | casing using the same can be provided. .

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as the case may be. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

  The resin composition of the present invention is characterized by containing a plant-derived polymer compound and carbon nanotubes and / or fullerenes.

  Here, the plant-derived polymer compound is not particularly limited as long as it is a plant-derived polymer, but is preferably a biodegradable polymer compound from the viewpoint of reducing industrial waste. The biodegradable polymer compound is not particularly limited as long as it is biodegradable, that is, a polymer having a property of being decomposed into carbon dioxide and water by microorganisms in soil or water. Specific examples of such degradable polymer compounds include celluloses such as starch, chitosan, cellulose acetate, and cellulose formate, aliphatic polyesters such as polylactic acid, polyhydroxybutyric acid, polybutylene succinate, and polybutylene adipate, and polycaprolactone. And polyphenols. Among these, aliphatic polyesters are preferable because they have appropriate plasticity, and polylactic acid is particularly preferable. These plant-derived polymer compounds can be used singly or in combination of two or more.

  When polylactic acid is used as a plant-derived polymer compound, the dispersibility of carbon nanotubes and / or fullerenes can be improved, and the resulting resin molded body has a higher elastic modulus, slidability, and wear resistance. Can be improved. In particular, when a carbon nanotube and / or fullerene having a carboxyl group as described later is used, the carboxyl group and a terminal hydroxyl group of polylactic acid are bonded, and the carbon nanotube and / or fullerene in polylactic acid is bonded. Dispersibility can be made very good.

  Moreover, in the resin composition of this invention, when using polylactic acid as a plant-derived high molecular compound, it is preferable that the weight average molecular weights of polylactic acid are 1000-200000, and it is especially preferable that it is 5000-100,000. If the weight average molecular weight is less than 1000, the mechanical strength of the resulting resin molded product tends to decrease. If it exceeds 200,000, the number of end groups of polylactic acid decreases, and the carbon nanotubes in the resin composition and / or Alternatively, the dispersibility of fullerene tends to decrease.

  In the resin composition of the present invention, the content of the plant-derived polymer compound is preferably 20 to 90% by mass, more preferably 30 to 80% by mass, based on the total amount of the resin composition, and 40 to 40%. It is especially preferable that it is 70 mass%. If the content of the plant-derived polymer compound is less than 20% by mass, the plant degree of the resin composition tends to be lowered, and the effect of reducing the environmental load tends not to be sufficiently obtained. There is a tendency that the surface energy reduction effect, the wear resistance improvement effect, the slidability improvement effect, and the elastic modulus improvement effect of the resin molding are reduced.

  As the carbon nanotubes in the present invention, known ones can be used without particular limitation, and the structure thereof may be single-walled carbon nanotubes or multi-walled carbon nanotubes, and the tip is closed or open. May be. The tube length of the carbon nanotube is preferably 5 to 500 nm, particularly preferably 20 to 200 nm. When the tube length is less than 5 nm, the surface energy reduction effect, the wear resistance improvement effect, the slidability improvement effect, and the elastic modulus improvement effect of the obtained resin molded product tend to decrease. The dispersibility in the compound tends to decrease, and the mechanical strength of the resulting resin molded product tends to decrease.

  Furthermore, the tube diameter (outer diameter) of the carbon nanotube is preferably 1 to 50 nm, and particularly preferably 3 to 10 nm. When the tube diameter is less than 1 nm, the surface energy reduction effect, the wear resistance improvement effect, the slidability improvement effect, and the elastic modulus improvement effect of the obtained resin molded product tend to decrease. The dispersibility in the compound tends to decrease, and the mechanical strength of the resulting resin molded product tends to decrease.

  The “carbon nanotube” in the present invention includes a “carbon nanotube derivative”. Here, the carbon nanotube derivatives include those in which a functional group or the like is bonded to the carbon nanotube by chemical modification, those in which a part of the carbon atom of the carbon nanotube is substituted with other atoms, and metal atoms in the tube And the like, and those obtained by substituting the tube ends with known substituents.

  When carbon nanotubes are used in the resin composition of the present invention, the carbon nanotubes are preferably carbon nanotube derivatives that have been processed to have a carboxyl group. The carboxyl group is preferably bonded to the end of the carbon nanotube. When the carbon nanotube has a carboxyl group, the dispersibility in the plant-derived polymer compound tends to be improved. In particular, it is preferable to use a compound having a hydroxyl group such as polylactic acid as the plant-derived polymer compound while using this carbon nanotube derivative. In this case, the carboxyl group of the carbon nanotube and the hydroxyl group of the plant-derived polymer compound are used. Are significantly bonded to each other, and the dispersibility of the carbon nanotubes is remarkably improved, and the material fluidity in the case of molding a resin molding by injection molding becomes very good.

  Moreover, as a fullerene in this invention, a well-known thing can be used without a restriction | limiting in particular, Any isomers, such as fullerene 60 and fullerene 72, can be used.

  The “fullerene” in the present invention includes “fullerene derivatives”. Here, fullerene derivatives include those in which a functional group or the like is bonded to fullerene by chemical modification, the carbon atoms of fullerene partially substituted with other atoms, or metal atoms in the carbon cage of fullerene. And the like that are confined. Among these fullerene derivatives, a fullerene derivative treated in a form having a carboxyl group is preferable from the same viewpoint as in the case of the carbon nanotube.

  The introduction of the carboxyl group into the carbon nanotube or fullerene can be performed, for example, by stirring the carbon nanotube or fullerene in 5 to 30% by weight of sulfuric acid for 1 to 10 hours. At this time, the carboxyl group can be introduced at a desired concentration by adjusting the concentration of sulfuric acid and the stirring time. In the carbon nanotube derivative or fullerene derivative thus obtained, the content of the carboxyl group is preferably 1 to 30% by volume based on the total volume of the carbon nanotube derivative or fullerene derivative from the viewpoint of obtaining higher dispersibility, More preferably, it is 5 to 20% by volume.

The concentration (content) of the carboxyl group in the carbon nanotube derivative and the fullerene derivative can be determined as follows using an FT-IR measuring device (manufactured by Shimadzu Corporation, IR Prestige 21). First, FT-IR spectra are measured for several types of sample compounds whose carboxyl group concentrations are known in advance, and a calibration curve is created by plotting the carboxyl group peak area near 1710 cm ⁻¹ and the concentration. Next, the FT-IR spectrum of the desired sample is measured to determine the carboxyl group peak area, and the concentration is determined from the prepared calibration curve.

  The carbon nanotubes and / or fullerenes described above can be used singly or in combination of two or more.

  In the resin composition of the present invention, the content of carbon nanotubes and / or fullerene is preferably 1 to 30% by mass and more preferably 5 to 20% by mass based on the total amount of the resin composition. When the content of the carbon nanotube and / or fullerene is less than 1% by mass, the effect of reducing the surface energy, improving the wear resistance, improving the slidability, and improving the elastic modulus of the resulting resin molded product tends to decrease. When the amount exceeds 30% by mass, the plant degree of the resin composition is lowered, and the effect of reducing the environmental load tends to be insufficient.

  In the resin composition of the present invention, the plant-derived polymer compound and the carbon nanotube and / or fullerene can be mixed by kneading by a mechanical method or the like, and preferably by biaxial kneading. In particular, when using a plant-derived polymer compound having a hydroxyl group and using a carbon nanotube and / or a fullerene having a carboxyl group, a metal oxide or an alkali metal hydroxide is added thereto, It is preferable to mix under conditions of a temperature of 100 ° C. or more and less than 200 ° C. by biaxial kneading. Thereby, the reaction of the hydroxyl group of the plant-derived polymer compound and the carboxyl group of the carbon nanotube and / or fullerene can be promoted, and the dispersibility of the carbon nanotube and / or fullerene can be dramatically improved.

  It is preferable to add a flame retardant to the resin composition of the present invention from the viewpoint of improving the flame retardancy of a resin molded article molded using the resin composition. Examples of the flame retardant include halogen flame retardant, phosphorus flame retardant, silicone flame retardant, and inorganic particle flame retardant. From the viewpoint of environmental load, phosphorus flame retardant, silicone flame retardant and inorganic flame retardant. It is preferable to use at least one flame retardant selected from particulate flame retardants. Preferred examples of these flame retardants include phosphoric acid flame retardants such as phosphoric acid ester-based, condensed phosphoric acid ester-based, and phosphorus-polymerized polyester-based materials, silicone-based flame retardants such as silicone powder and silicone resin, aluminum hydroxide, Examples include inorganic particle flame retardants such as magnesium hydroxide. These flame retardants can be used singly or in combination of two or more.

  When the flame retardant is contained in the resin composition of the present invention, the content is preferably 1 to 40% by mass, more preferably 2 to 20% by mass based on the total amount of the resin composition. When the content of the flame retardant is less than 1% by mass, the flame retardancy tends to be insufficient, and when it exceeds 40% by mass, the mechanical strength of the obtained resin molded product tends to decrease.

  The resin composition of the present invention may further contain other additives in addition to the components described above. Examples of such additives include weathering agents, antioxidants, dispersion aids, hydrolysis inhibitors, crystallization accelerators, and the like. The content of these additives is not particularly limited as long as the effects of the present invention are not impaired, but is preferably 10% by mass or less based on the total amount of the resin composition.

  Next, the resin molded body of the present invention will be described. The resin molded body of the present invention is obtained by molding the above-described resin composition of the present invention. For example, the resin composition of the present invention is formed by injection molding, injection compression molding, press molding, extrusion molding, blow molding. It can be obtained by molding by a known method such as molding, calendar molding, coating molding, cast molding or dipping molding. Among these, it is preferable to use injection molding in that the dispersibility between the plant-derived polymer compound and the carbon nanotube and / or fullerene having greatly different specific gravity can be particularly improved.

  The use of the resin molded product of the present invention is not particularly limited, but as specific examples, for example, housings such as home appliances and office equipment or various parts thereof, wrapping films, storage cases such as CD-ROM and DVD, tableware , Food trays, beverage bottles, chemical wraps and the like. In particular, since the resin molded product of the present invention has extremely high slidability and wear resistance, it is preferably used for applications requiring such characteristics, for example, for parts such as gears.

  FIG. 1 is an external perspective view of an image forming apparatus provided with a housing and office equipment parts according to an embodiment of the resin molded body of the present invention, as viewed from the front side. The image forming apparatus 100 in FIG. 1 includes front covers 120 a and 120 b on the front surface of the main body device 110. These front covers 120a and 120b can be opened and closed so that the user can access the inside of the apparatus. As a result, the user can replenish the toner when the toner is exhausted, replace the exhausted process cartridge, and remove the jammed paper when a jam occurs in the apparatus. FIG. 1 shows the apparatus with the front covers 120a and 120b opened.

  On the upper surface of the main body 110, an operation panel 130 on which various conditions relating to image formation such as a paper size and the number of copies are input by a user operation, and a copy glass 132 on which a document to be read is placed are provided. . Further, the main body device 110 includes an automatic document feeder 134 that can automatically convey a document on the copy glass 132. Further, main device 110 includes an image reading device that scans a document image placed on copy glass 132 and obtains image data representing the document image. Image data obtained by the image reading apparatus is sent to the image forming unit via the control unit. Note that the image reading device and the control unit are housed in a housing 150 that forms part of the main body device 110. The image forming unit is provided in the housing 150 as a detachable process cartridge 142. The process cartridge 142 can be attached and detached by turning the operation lever 144.

  A toner container 146 is attached to the casing 150 of the main body device 110, and toner can be replenished from the toner supply port 148. The toner stored in the toner storage unit 146 is supplied to the developing device.

  On the other hand, sheet storage cassettes 140a, 140b, and 140c are provided at the lower portion of the main unit 110. In addition, the main body apparatus 110 has a plurality of conveying rollers formed of a pair of rollers arranged in the apparatus, thereby forming a conveying path through which the sheets of the sheet storage cassette are conveyed to the upper image forming unit. ing. The paper in each paper storage cassette is taken out one by one by a paper take-out mechanism disposed near the end of the transport path and sent out to the transport path. Further, a manual paper tray 136 is provided on the side surface of the main body 110, and paper can be supplied from here.

  The paper on which the image is formed by the image forming unit is sequentially transferred between two fixing rolls that are supported by a casing 152 constituting a part of the main body device 110 and abut against each other. Paper is discharged to the outside. The main body device 110 is provided with a plurality of discharge trays 138 on the side opposite to the side on which the paper tray 136 is provided, and paper after image formation is discharged to these trays.

  In the image forming apparatus 100, the front covers 120a and 120b receive a lot of loads such as stress and impact during opening and closing and vibration during image formation. Further, the process cartridge 142 receives many loads such as attachment / detachment impact and vibration during image formation. In addition, the housing 150 and the housing 152 receive a large load such as vibration during image formation. Since the resin molded body of the present invention is excellent in elastic modulus, slidability and wear resistance, the resin molded body constitutes the front covers 120a and 120b, the exterior of the process cartridge 142, the housing 150, the housing 152, and the like. When it does, those abrasions, damage, etc. can fully be suppressed. Therefore, the resin molded body of the present invention is preferably used as the front covers 120a and 120b of the image forming apparatus 100, the exterior of the process cartridge 142, the casing 150, the casing 152, and the like.

  FIG. 2 is a front view showing a gear according to another embodiment of the resin molded body of the present invention. The gear 200 shown in FIG. 2 has a disk-like tooth bottom portion 201 serving as a basic member, and a plurality of tooth members 202 provided along the outer peripheral surface of the tooth bottom portion 201. Further, a shaft hole 204 is provided in the center of the side surface of the tooth bottom portion 201 so as to penetrate the rotation shaft of the drive source. And the tooth bottom part 201 and the tooth member 202 are comprised with the resin molding of this invention.

  The gear 200 is used to transmit a driving force obtained by a driving source such as a motor. For example, in an image forming apparatus, an electrophotographic photosensitive drum, a developing device, a cleaning device, a transfer device, a fixing device, and a paper conveying device. And a drive unit such as a paper feeder. In these drive units, a pair of gears that are linked to each other is used for transmission of the driving force, and wear and damage are likely to occur because the meshing portions grind each other. Since the resin molded body of the present invention is excellent in elastic modulus, slidability, and wear resistance, when the gear 200 is constituted by such a resin molded body, the wear, damage, and the like can be sufficiently suppressed. Therefore, the resin molded body of the present invention is preferably used as the gear 200 that is a component of the image forming apparatus.

  As described above, since the resin molded body of the present invention has a sufficiently high elastic modulus, slidability, and wear resistance, the front cover of the image forming apparatus, the exterior of the process cartridge, the housing, the gear, etc. It is suitable as.

  EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example and a comparative example, this invention is not limited to a following example.

(Example 1)
70 parts by mass of polylactic acid (Mitsui Chemicals, Lacia H-100, weight average molecular weight 90000), 20 parts by mass of carbon nanotubes (manufactured by NEC, single-layer structure with open ends, diameter 7 nm), and phosphate ester (large 10 parts by mass of Yaku Chemical Co., Ltd., PX200) was kneaded at 170 ° C. with a biaxial kneader (Toyo Seiki Co., Ltd., Labo Plast Mill) to obtain a resin composition. The obtained resin composition was injection-molded with an injection molding machine (manufactured by Nissei Plastic Industry Co., Ltd., EX-500) under the conditions of a resin temperature of 190 ° C. and a mold temperature of 100 ° C., and an ISO multipurpose dumbbell test piece and 150 mm × A flat plate test piece having a thickness of 150 mm and a thickness of 3 mm was obtained.

  About the said flat plate test piece, the contact angle with water was measured with the contact angle measuring apparatus. The larger the contact angle, the lower the surface energy of the resin molded body. Further, the flat plate test piece was subjected to a Taber abrasion test (500 g, 500 times) based on JIS K7204, and the weight reduction rate was obtained to evaluate the wear resistance. Furthermore, the flexural modulus of the ISO multipurpose dumbbell test piece was measured with an Instron tester (manufactured by Toyo Seiki Co., Ltd., Strograph V-30). The results are shown in Table 1.

(Example 2)
Instead of carbon nanotubes (manufactured by NEC, single-layer structure with open ends, diameter 7 nm), the carbon nanotubes were stirred in 0.1N sulfuric acid for 1 hour and modified to have a carboxyl group of 10% by volume. An ISO multipurpose dumbbell specimen and a flat specimen were obtained in the same manner as in Example 1 except that the nanotube derivative was used. Evaluation similar to Example 1 was implemented using these test pieces. The results are shown in Table 1.

(Example 3)
Instead of carbon nanotubes (manufactured by NEC, single-layer structure with open ends, diameter 7 nm), the carbon nanotubes were stirred in 0.1N sulfuric acid for 10 hours and modified to have a carboxyl group of 50% by volume. An ISO multipurpose dumbbell specimen and a flat specimen were obtained in the same manner as in Example 1 except that the nanotube derivative was used. Evaluation similar to Example 1 was implemented using these test pieces. The results are shown in Table 1.

Example 4
60 parts by mass of a carbon nanotube derivative modified with 20 parts by mass of polylactic acid (Mitsui Chemicals, Lacia H-100, weight average molecular weight 900000), 10% by volume of a carboxyl group, and phosphate ester (Daihachi Chemical Co., Ltd., PX200) An ISO multipurpose dumbbell test piece and a flat plate test piece were obtained in the same manner as in Example 2 except that the amount was 20 parts by mass. Evaluation similar to Example 1 was implemented using these test pieces. The results are shown in Table 1.

(Example 5)
5 parts by mass of a carbon nanotube derivative modified with a resin composition comprising 90 parts by mass of polylactic acid (Mitsui Chemicals, Lacia H-100, weight average molecular weight 90000), 10% by volume of a carboxyl group, and phosphate ester (Daihachi Chemical Co., Ltd., PX200) An ISO multipurpose dumbbell test piece and a flat plate test piece were obtained in the same manner as in Example 2 except that the amount was 5 parts by mass. Evaluation similar to Example 1 was implemented using these test pieces. The results are shown in Table 1.

(Example 6)
In the same manner as in Example 1 except that fullerene (Fullerene-C ₆₀ manufactured by Aldrich) was used instead of carbon nanotubes (manufactured by NEC, single-layer structure with open end, diameter 7 nm) A dumbbell specimen and a flat specimen were obtained. Evaluation similar to Example 1 was implemented using these test pieces. The results are shown in Table 1.

(Example 7)
In the same manner as in Example 1 except that fullerene (Fullerene-C ₇₆ manufactured by Aldrich) was used instead of carbon nanotubes (manufactured by NEC, single-layer structure with open end, diameter 7 nm) A dumbbell specimen and a flat specimen were obtained. Evaluation similar to Example 1 was implemented using these test pieces. The results are shown in Table 1.

(Comparative Example 1)
Polylactic acid-polycarbonate alloy (manufactured by Toray Industries, Inc., V554R10) is injection-molded on an injection molding machine (manufactured by Nissei Plastic Industry Co., Ltd., EX-500) under conditions of a resin temperature of 190 ° C. and a mold temperature of 100 ° C. A test piece and a flat plate test piece having a size of 150 mm × 150 mm and a thickness of 3 mm were obtained. Evaluation similar to Example 1 was implemented using these test pieces. The results are shown in Table 1.

(Comparative Example 2)
Polylactic acid-Nanoclay alloy (Unitika Ltd., TE2100) was injection-molded with an injection molding machine (Nissei Plastic Industry Co., Ltd., EX-500) under the conditions of a resin temperature of 190 ° C and a mold temperature of 100 ° C. A test piece and a flat plate test piece having a size of 150 mm × 150 mm and a thickness of 3 mm were obtained. Evaluation similar to Example 1 was implemented using these test pieces. The results are shown in Table 1.

(Examples 8 to 14 and Comparative Examples 3 to 4)
About each of Examples 8-14 and Comparative Examples 3-4, the resin composition was injection-molded with each composition and conditions of Examples 1-7 and Comparative Examples 1-2, and a color compound machine (made by Fuji Xerox Co., Ltd., The small gear for the drive part of the heating roll in the front cover and fixing device of DocuCenter Color500) was molded. The front cover was subjected to a Taber abrasion test in the same manner as in Example 1, and the weight reduction rate was determined to evaluate the abrasion resistance. In addition, in order to evaluate the slidability, the small gear (5.0 g) is mounted on the heating roll driving unit in the fixing device of the color multifunction peripheral, and the small gear wears after 1 million rotations at 3600 rpm. The amount (weight loss) was determined. The results are shown in Table 2.

  As is clear from the results shown in Tables 1 and 2, the resin composition and the resin molded body (Examples 1 to 14) of the present invention are compared with the resin composition and the resin molded body of Comparative Examples 1 to 4. It was confirmed that the surface energy was sufficiently reduced and the wear resistance, slidability and elastic modulus were excellent.

1 is an external perspective view of an image forming apparatus including a casing and office equipment parts according to an embodiment of a resin molded body of the present invention. It is a front view which shows the gear which concerns on other one Embodiment of the resin molding of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Image forming apparatus, 110 ... Main body apparatus, 120a, b ... Front cover, 142 ... Process cartridge, 150, 152 ... Case, 200 ... Gear.

Claims (4)

  A resin composition comprising a plant-derived polymer compound and carbon nanotubes and / or fullerenes.   A resin molded product comprising a plant-derived polymer compound and carbon nanotubes and / or fullerenes.   A resin molded article obtained by molding the resin composition according to claim 1. A housing in which the resin molded body according to claim 2 or 3 is used in part or in whole.

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