JP2004010707A - Coating composition for sliding, and slide member - Google Patents
Coating composition for sliding, and slide member Download PDFInfo
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- JP2004010707A JP2004010707A JP2002164254A JP2002164254A JP2004010707A JP 2004010707 A JP2004010707 A JP 2004010707A JP 2002164254 A JP2002164254 A JP 2002164254A JP 2002164254 A JP2002164254 A JP 2002164254A JP 2004010707 A JP2004010707 A JP 2004010707A
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- resin
- coating composition
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- solid lubricant
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Abstract
Description
【0001】
【発明の属する技術分野】
本発明は、摺動用被覆組成物に関するものであり、さらに詳しく述べるならば黒鉛、MoS2、PTFEなどの固体潤滑剤を樹脂で結合して基材に塗布する摺動用被覆組成物に関するものである。特に、乾燥摺動摩擦で比較的軽荷重条件で使用される摺動部材に関するものである。
【0002】
【従来の技術】
上記した条件で使用される摺動用被覆組成物は次の特性を利用している。(イ)固体潤滑剤の低摩擦性を利用して皮膜を基体上に形成する。(ロ)強度及び耐熱性に優れたバインダー樹脂により耐摩擦性を高めるとともに、固体潤滑剤を安定的に保持する。
【0003】
上記(イ)の機構は次のように考えられる。摺動部材に成膜されたPTFEなどの固体潤滑剤の粒子は相手材からの荷重によりせん断され、相手材に被着して移着膜を作る。この移着膜も摺動部材により容易に削り取られる。これらの現象故に低摩擦性が実現される反面、PTFEは耐摩耗性に優れない固体潤滑剤である。このために、Pbなどを皮膜に添加して移着膜の強度を高めるなどの対策が講じられている。
【0004】
特開昭61−241396号公報によると、金属切削機、自動車、発動機、水圧機などに用いられ、低摩擦性を実現する潤滑剤として炭素数8〜22の脂肪族アシル基を有するNω−モノアシル塩基性アミノ酸を使用することが提案されている。具体的使用形態としてはこの潤滑剤を基油に添加し、必要に応じて、黒鉛、マイカ、タルク、亜鉛華、硫黄、硫化モリブデン、ステアリン酸亜鉛などの従来の固体潤滑剤を併用添加するものである。
【0005】
【発明が解決しようとする課題】
乾燥摺動摩擦条件にて使用される樹脂組成物としては、ベース樹脂に対し、固体潤滑剤と呼ばれるグラファイト、MoS2 、PTFE等を配合して使用されてきたが、摩擦係数を一層低下する必要があり、さらに耐摩耗性も十分ではなかった。
【0006】
【課題を解決するための手段】
本発明に係る摺動用被覆組成物はバインダー樹脂、固体潤滑剤、及びNω−モノアシル塩基性アミノ酸を含んでなることを特徴とする。
本発明においては、バインダー樹脂は、ポリイミド樹脂、ポリアミドイミド樹脂、エポキシ樹脂、アルキッド樹脂、フェノール樹脂、ポリアセタール樹脂、及びポリエーテルスルホン樹脂からなる群より選ばれた少なくとも1種以上の樹脂であることが好ましい。
また、固体潤滑剤は、ふっ素樹脂、二硫化モリブデン、二硫化タングステン、グラファイト、窒化ホウ素、メラミンシアヌレート、フッ化黒鉛、雲母からなる群から選ばれた少なくとも1種以上であることが好ましい。これらの平均粒径は0.5〜20μm、好ましくは1mm〜10 mmである。固体潤滑剤の1から20重量%以下を金属粉、金属酸化物、金属石鹸からなる群より選ばれた少なくとも1種で置換することにより、耐摩耗性を向上することができる。
前記Nω−モノアシル塩基性アミノ酸は好ましくは炭素数8〜22の脂肪族アシル基を有し、より好ましくはNε−ラウロイル−L−リジンである。以下、Nε−ラウロイル−L−リジンの例について説明する。
【0007】
本発明においては、Nε−ラウロイル−L−リジンとベース樹脂のみの組成物では、Nε−ラウロイル−L−リジンの移着膜の強度不足により、耐摩耗性が劣るので、強度のあるPTFEをさらに添加することにより、PTFEがNε−ラウロイル−L−リジンと複合され、移着膜の強度が上がり、低摩擦かつ耐摩耗性に優れた材料となる。
したがって、Nε−ラウロイル−L−リジンの量が多いと移着膜の強度不足により、耐摩耗性が劣り、また量が少ないとその低摩擦の効果を発揮できないので量としては1〜20容量%が好ましい。
【0008】
本発明に係る摺動用被覆組成物は、アルミニウム、鉄、鋼、銅などの板材、管材などの表面被覆として用いられる。被覆後の皮膜の厚さは10〜30μmであることが好ましい。表面粗さは特に制約はないが、2〜8μmRzが好ましい。
皮膜としての適用方法は、当該組成物を樹脂の溶剤とともに混合し、公知の方法で成膜した後樹脂の焼成温度で焼成する。
【0009】
【作用】
Nε−ラウロイル−L−リジンは低摩擦性に特長があるので、これをバインダー樹脂で結合することにより、低摩擦性被覆組成物が得られる。Nε−ラウロイル−L−リジンはPTFEなどより低強度であるので、PTFEなどの固体潤滑剤が共存していると耐摩耗性の低下を抑えることができる。
また、摺動中において相手軸と摺動面間にNε−ラウロイル−L−リジンと固体潤滑剤との複合層が形成され、低摩擦になる。低摩擦化に伴い摺動面の発熱温度が抑えられ、惹いては樹脂組成物、移着層の損傷も抑えられ結果として優れた耐摩擦性が得られる。
【0010】
従来のPb添加PTFEと比較すると本発明のNε−ラウロイル−L−リジンの耐摩耗性はほぼ同等であるが、摩擦係数は後者のほうが低い。
以下、実施例により本発明を詳しく説明する。
【0011】
【実施例】
S50C基材(厚さ約5mm)にショットブラスト処理後、下記樹脂組成物を約20μmの厚さでスプレーコートした。なお、Nε−ラウロイル−L−リジンは味の素株式会社のアミホープLL(登録商標)を使用し、ポリアミドイミド(PAI)樹脂は日立化成HPC−4250を使用した。黒鉛の粒径は平均1 mmであり、二硫化モリブデンの粒径は平均0.5 mmであった。スプレーによる成膜後180℃で焼成した後次の条件で摩擦係数及び摩耗量を測定した。
【0012】
試験条件
試験機:スラスト試験機
潤滑:ドライ
時間:3h
荷重:1.1kN(面圧5MPa)
速度:0.3m/s
相手軸:SCM415(焼入)
軸粗さ:1.0〜1.2μmRz
試験の結果を表1に示す。
【0013】
【表1】
【0014】
比較材1はNε−ラウロイル−L−リジンとPAIのみが成分であるから、耐焼付性が不良である。
比較材5〜8は段落番号0003で説明した従来の材料に相当しており、これらと本発明実施例1,3,4を比較すると低摩擦性及び耐摩耗性の面での改良が明らかである。実施例2は請求項7の範囲外の組成であるために、摩耗量が多くなっている。
【0015】
さらに、添加剤の種類を変えて同様の実験を行った結果を示す。
(a)実施例1のPAIに代えてエポキシ樹脂を使用したところ、摩擦係数は0.11、摩耗量は6μmとなった。
(b)実施例1のPTFEの20%をPb粉に代えたところ、摩擦係数は0.13、摩耗量は4μmとなった。
(c)実施例1のPTFEの20%をFe2O3粉に代えたところ、焼付いた。
【0016】
【発明の効果】
以上説明したように、本発明により提供される摺動用被覆組成物は従来の同種組成物より低摩擦性及び耐摩耗性の総合面で優れている。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sliding coating composition, and more particularly, to a sliding coating composition in which a solid lubricant such as graphite, MoS 2 , PTFE, etc. is bonded to a resin and applied to a substrate. . In particular, the present invention relates to a sliding member used under relatively light load conditions due to dry sliding friction.
[0002]
[Prior art]
The sliding coating composition used under the above conditions utilizes the following properties. (A) A film is formed on a substrate by utilizing the low friction property of a solid lubricant. (B) The friction resistance is enhanced by a binder resin having excellent strength and heat resistance, and the solid lubricant is stably held.
[0003]
The above mechanism (a) is considered as follows. Particles of a solid lubricant such as PTFE formed on the sliding member are sheared by a load from a counterpart material and adhere to the counterpart material to form a transfer film. This transfer film is also easily scraped off by the sliding member. Because of these phenomena, low friction is realized, but PTFE is a solid lubricant having poor wear resistance. For this reason, measures such as adding Pb or the like to the film to increase the strength of the transfer film have been taken.
[0004]
According to Japanese Patent Application Laid-Open No. 61-241396, Nω- having an aliphatic acyl group having 8 to 22 carbon atoms is used as a lubricant which is used for a metal cutting machine, an automobile, an engine, a hydraulic machine and the like and realizes low friction. It has been proposed to use monoacyl basic amino acids. As a specific use form, this lubricant is added to the base oil, and if necessary, a conventional solid lubricant such as graphite, mica, talc, zinc white, sulfur, molybdenum sulfide, zinc stearate is added in combination. It is.
[0005]
[Problems to be solved by the invention]
As a resin composition used under dry sliding friction conditions, graphite, MoS 2 , PTFE, etc., which are called solid lubricants, have been used in combination with a base resin, but it is necessary to further reduce the friction coefficient. And the abrasion resistance was not sufficient.
[0006]
[Means for Solving the Problems]
The sliding coating composition according to the present invention is characterized by comprising a binder resin, a solid lubricant, and an Nω-monoacyl basic amino acid.
In the present invention, the binder resin may be at least one resin selected from the group consisting of polyimide resin, polyamideimide resin, epoxy resin, alkyd resin, phenol resin, polyacetal resin, and polyether sulfone resin. preferable.
The solid lubricant is preferably at least one selected from the group consisting of fluororesin, molybdenum disulfide, tungsten disulfide, graphite, boron nitride, melamine cyanurate, fluorinated graphite, and mica. Their average particle size is 0.5 to 20 μm, preferably 1 to 10 mm. By replacing 1 to 20% by weight or less of the solid lubricant with at least one selected from the group consisting of metal powders, metal oxides, and metal soaps, the wear resistance can be improved.
The Nω-monoacyl basic amino acid preferably has an aliphatic acyl group having 8 to 22 carbon atoms, and is more preferably Nε-lauroyl-L-lysine. Hereinafter, an example of Nε-lauroyl-L-lysine will be described.
[0007]
In the present invention, the composition comprising only Nε-lauroyl-L-lysine and the base resin has poor abrasion resistance due to insufficient strength of the transfer film of Nε-lauroyl-L-lysine. By adding PTFE, PTFE is combined with Nε-lauroyl-L-lysine, whereby the strength of the transfer film is increased, and a material having low friction and excellent wear resistance is obtained.
Therefore, when the amount of Nε-lauroyl-L-lysine is large, the abrasion resistance is inferior due to insufficient strength of the transfer film, and when the amount is small, the effect of low friction cannot be exhibited. Is preferred.
[0008]
The sliding coating composition according to the present invention is used as a surface coating for plate materials such as aluminum, iron, steel, and copper, and pipe materials. The thickness of the coating after coating is preferably 10 to 30 μm. The surface roughness is not particularly limited, but is preferably 2 to 8 μmRz.
As a method of applying a film, the composition is mixed with a solvent for a resin, and a film is formed by a known method, and then fired at a firing temperature of the resin.
[0009]
[Action]
Since Nε-lauroyl-L-lysine is characterized by low friction, a low friction coating composition can be obtained by binding it with a binder resin. Since Nε-lauroyl-L-lysine has lower strength than PTFE or the like, if a solid lubricant such as PTFE coexists, a decrease in wear resistance can be suppressed.
Further, during sliding, a composite layer of Nε-lauroyl-L-lysine and a solid lubricant is formed between the mating shaft and the sliding surface, resulting in low friction. As the friction is reduced, the heat generation temperature of the sliding surface is suppressed, and accordingly, the damage of the resin composition and the transfer layer is also suppressed. As a result, excellent friction resistance is obtained.
[0010]
Compared with the conventional Pb-doped PTFE, the wear resistance of the Nε-lauroyl-L-lysine of the present invention is almost the same, but the latter has a lower coefficient of friction.
Hereinafter, the present invention will be described in detail with reference to examples.
[0011]
【Example】
After shot blasting on an S50C base material (thickness: about 5 mm), the following resin composition was spray-coated with a thickness of about 20 μm. In addition, Nε-lauroyl-L-lysine used Amihope LL (registered trademark) manufactured by Ajinomoto Co., Inc., and polyamide-imide (PAI) resin used Hitachi Chemical HPC-4250. The average particle size of graphite was 1 mm, and the average particle size of molybdenum disulfide was 0.5 mm. After the film was formed by spraying and baked at 180 ° C., the friction coefficient and the wear amount were measured under the following conditions.
[0012]
Test conditions Test machine: Thrust test machine Lubrication: Dry time: 3h
Load: 1.1kN (contact pressure 5MPa)
Speed: 0.3m / s
Mating axis: SCM415 (hardened)
Shaft roughness: 1.0 to 1.2 μm Rz
Table 1 shows the test results.
[0013]
[Table 1]
[0014]
Comparative material 1 has poor seizure resistance because only Nε-lauroyl-L-lysine and PAI are components.
Comparative materials 5 to 8 correspond to the conventional materials described in paragraph [0003], and when these are compared with Examples 1, 3, and 4 of the present invention, improvements in low friction and wear resistance are apparent. is there. In Example 2, since the composition was out of the range of claim 7, the amount of wear was large.
[0015]
Further, the results of the same experiment performed by changing the type of the additive are shown.
(A) When an epoxy resin was used in place of the PAI of Example 1, the friction coefficient was 0.11 and the wear amount was 6 μm.
(B) When 20% of the PTFE of Example 1 was replaced with Pb powder, the friction coefficient was 0.13 and the wear amount was 4 μm.
(C) When 20% of the PTFE in Example 1 was replaced with Fe 2 O 3 powder, seizure occurred.
[0016]
【The invention's effect】
As described above, the sliding coating composition provided by the present invention is superior to conventional compositions of the same kind in terms of overall low friction and wear resistance.
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP2002164254A JP2004010707A (en) | 2002-06-05 | 2002-06-05 | Coating composition for sliding, and slide member |
Applications Claiming Priority (1)
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JP2002164254A JP2004010707A (en) | 2002-06-05 | 2002-06-05 | Coating composition for sliding, and slide member |
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JP2004010707A true JP2004010707A (en) | 2004-01-15 |
JP2004010707A5 JP2004010707A5 (en) | 2005-09-29 |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102008000928A1 (en) * | 2008-04-02 | 2009-10-08 | Robert Bosch Gmbh | Coating for elastomeric strand-shaped profiles, in particular windscreen wiper blades, and process for their preparation |
WO2012111774A1 (en) | 2011-02-18 | 2012-08-23 | 大豊工業株式会社 | Sliding material composition and sliding member |
EP3037505A4 (en) * | 2013-08-16 | 2017-01-18 | JX Nippon Oil & Energy Corporation | Lubricant oil composition for internal combustion engine |
JP2017031987A (en) * | 2015-07-29 | 2017-02-09 | 大豊工業株式会社 | Slide member and swash plate-type compressor |
CN108929745A (en) * | 2018-08-17 | 2018-12-04 | 深圳南科新材科技有限公司 | A kind of anti-wear additive, preparation method, purposes and the lubricating oil containing it |
JP2020012186A (en) * | 2018-07-20 | 2020-01-23 | 株式会社東芝 | Apparatus and system for producing hydrogen |
CN114616404A (en) * | 2019-08-09 | 2022-06-10 | 马勒国际有限公司 | Sliding element comprising a polymer overlayer |
-
2002
- 2002-06-05 JP JP2002164254A patent/JP2004010707A/en active Pending
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8575078B2 (en) | 2008-04-02 | 2013-11-05 | Robert Bosch Gmbh | Coating for elastomeric linear profiles, in particular windscreen-wiper blades, and process for production thereof |
DE102008000928A1 (en) * | 2008-04-02 | 2009-10-08 | Robert Bosch Gmbh | Coating for elastomeric strand-shaped profiles, in particular windscreen wiper blades, and process for their preparation |
EP2677021A4 (en) * | 2011-02-18 | 2014-08-20 | Taiho Kogyo Co Ltd | Sliding material composition and sliding member |
CN103415604A (en) * | 2011-02-18 | 2013-11-27 | 大丰工业株式会社 | Sliding material composition and sliding member |
EP2677021A1 (en) * | 2011-02-18 | 2013-12-25 | Taiho Kogyo Co., Ltd | Sliding material composition and sliding member |
JPWO2012111774A1 (en) * | 2011-02-18 | 2014-07-07 | 大豊工業株式会社 | Sliding material composition and sliding member |
WO2012111774A1 (en) | 2011-02-18 | 2012-08-23 | 大豊工業株式会社 | Sliding material composition and sliding member |
EP3037505A4 (en) * | 2013-08-16 | 2017-01-18 | JX Nippon Oil & Energy Corporation | Lubricant oil composition for internal combustion engine |
JP2017031987A (en) * | 2015-07-29 | 2017-02-09 | 大豊工業株式会社 | Slide member and swash plate-type compressor |
JP2020012186A (en) * | 2018-07-20 | 2020-01-23 | 株式会社東芝 | Apparatus and system for producing hydrogen |
JP7027275B2 (en) | 2018-07-20 | 2022-03-01 | 株式会社東芝 | Hydrogen production equipment and hydrogen production system |
CN108929745A (en) * | 2018-08-17 | 2018-12-04 | 深圳南科新材科技有限公司 | A kind of anti-wear additive, preparation method, purposes and the lubricating oil containing it |
CN114616404A (en) * | 2019-08-09 | 2022-06-10 | 马勒国际有限公司 | Sliding element comprising a polymer overlayer |
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