JP6753579B2 - Friction material composition, friction material and friction member - Google Patents
Friction material composition, friction material and friction member Download PDFInfo
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- JP6753579B2 JP6753579B2 JP2014210023A JP2014210023A JP6753579B2 JP 6753579 B2 JP6753579 B2 JP 6753579B2 JP 2014210023 A JP2014210023 A JP 2014210023A JP 2014210023 A JP2014210023 A JP 2014210023A JP 6753579 B2 JP6753579 B2 JP 6753579B2
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- 239000002783 friction material Substances 0.000 title claims description 103
- 239000000203 mixture Substances 0.000 title claims description 58
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 26
- 229910052802 copper Inorganic materials 0.000 claims description 26
- 239000010949 copper Substances 0.000 claims description 26
- 239000000835 fiber Substances 0.000 claims description 24
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 22
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- CDRCPXYWYPYVPY-UHFFFAOYSA-N iron(2+) oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Fe+2].[Fe+2].[Fe+2].[Fe+2] CDRCPXYWYPYVPY-UHFFFAOYSA-N 0.000 claims description 15
- 238000000465 moulding Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 12
- 239000011256 inorganic filler Substances 0.000 claims description 11
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 11
- 239000012766 organic filler Substances 0.000 claims description 11
- 239000011230 binding agent Substances 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims 1
- 239000005011 phenolic resin Substances 0.000 description 15
- 230000002159 abnormal effect Effects 0.000 description 14
- 229920001568 phenolic resin Polymers 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 6
- 239000012784 inorganic fiber Substances 0.000 description 6
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 244000226021 Anacardium occidentale Species 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 3
- 239000010425 asbestos Substances 0.000 description 3
- 235000020226 cashew nut Nutrition 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 230000001788 irregular Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 239000003607 modifier Substances 0.000 description 3
- 150000002989 phenols Chemical class 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229910052895 riebeckite Inorganic materials 0.000 description 3
- 239000005060 rubber Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002557 mineral fiber Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 229920002972 Acrylic fiber Polymers 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 241001255854 Teras Species 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000005083 Zinc sulfide Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229920000800 acrylic rubber Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229940007424 antimony trisulfide Drugs 0.000 description 1
- NVWBARWTDVQPJD-UHFFFAOYSA-N antimony(3+);trisulfide Chemical compound [S-2].[S-2].[S-2].[Sb+3].[Sb+3] NVWBARWTDVQPJD-UHFFFAOYSA-N 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- NNLOHLDVJGPUFR-UHFFFAOYSA-L calcium;3,4,5,6-tetrahydroxy-2-oxohexanoate Chemical compound [Ca+2].OCC(O)C(O)C(O)C(=O)C([O-])=O.OCC(O)C(O)C(O)C(=O)C([O-])=O NNLOHLDVJGPUFR-UHFFFAOYSA-L 0.000 description 1
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 229920005556 chlorobutyl Polymers 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 229920003049 isoprene rubber Polymers 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- HZZOEADXZLYIHG-UHFFFAOYSA-N magnesiomagnesium Chemical compound [Mg][Mg] HZZOEADXZLYIHG-UHFFFAOYSA-N 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- GROMGGTZECPEKN-UHFFFAOYSA-N sodium metatitanate Chemical compound [Na+].[Na+].[O-][Ti](=O)O[Ti](=O)O[Ti]([O-])=O GROMGGTZECPEKN-UHFFFAOYSA-N 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- AFNRRBXCCXDRPS-UHFFFAOYSA-N tin(ii) sulfide Chemical compound [Sn]=S AFNRRBXCCXDRPS-UHFFFAOYSA-N 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 239000010455 vermiculite Substances 0.000 description 1
- 229910052902 vermiculite Inorganic materials 0.000 description 1
- 235000019354 vermiculite Nutrition 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Description
本発明は、自動車等の制動に用いられるディスクブレーキパッド等の摩擦材に適した摩擦材組成物及び摩擦材組成物を用いた摩擦材に関し、特にアスベストを含まないノンアスベスト摩擦材組成物に関する。また、該摩擦材組成物を用いた摩擦材及び摩擦部材に関する。 The present invention relates to a friction material composition suitable for a friction material such as a disc brake pad used for braking an automobile or the like, and a friction material using the friction material composition, and particularly to a non-asbestos friction material composition containing no asbestos. Further, the present invention relates to a friction material and a friction member using the friction material composition.
自動車等には、その制動のためにディスクブレーキパッド、ブレーキライニング等の摩擦材が使用されている。摩擦材は、ディスクローター、ブレーキドラム等の対面材と摩擦することにより、制動の役割を果たしている。そのため、摩擦材には、良好な摩擦係数、耐摩耗性（摩擦材の寿命が長いこと）、強度、音振性（ブレーキ鳴きや異音が発生しにくいこと）等が要求される。摩擦係数は車速、減速度やブレーキ温度によらず安定であることが要求される。 Friction materials such as disc brake pads and brake linings are used for braking in automobiles and the like. The friction material plays a role of braking by rubbing against a facing material such as a disc rotor and a brake drum. Therefore, the friction material is required to have a good friction coefficient, wear resistance (long life of the friction material), strength, sound vibration property (less likely to generate brake squeal or abnormal noise), and the like. The coefficient of friction is required to be stable regardless of vehicle speed, deceleration and braking temperature.
摩擦材には、結合材、繊維基材、無機充填材及び有機充填材等を含む摩擦材組成物が用いられ、前記特性を発現させるために、一般的に、各成分を１種又は２種以上を組合せた摩擦材組成物が用いられる。中でも銅は繊維や粉末の形態で摩擦材に配合され、高温での制動条件下での摩擦係数の保持（耐フェード性）や高温での耐摩耗性改善に有効な成分である。しかし、銅を含有する摩擦材は、制動時に生成する摩耗粉に銅を含み、河川、湖や海洋汚染等の原因となる可能性が示唆されているため、使用を制限する動きが高まっている。 As the friction material, a friction material composition containing a binder, a fiber base material, an inorganic filler, an organic filler and the like is used, and in order to exhibit the above-mentioned characteristics, generally one or two kinds of each component are used. A friction material composition combining the above is used. Among them, copper is blended in the friction material in the form of fiber or powder, and is an effective component for maintaining the coefficient of friction (fade resistance) under braking conditions at high temperature and improving wear resistance at high temperature. However, copper-containing friction materials contain copper in the abrasion powder generated during braking, and it has been suggested that it may cause pollution of rivers, lakes, oceans, etc., so there is a growing movement to limit its use. ..
このような銅の使用を制限する動きの中、特許文献１には、銅を含有しない組成における強度、耐摩耗性を改善する手法として、複数の凸形状を有するチタン酸カリウムと生体溶解性無機繊維とを含有させることを特徴とする摩擦材が提案されている。 In such a movement to limit the use of copper, Patent Document 1 describes potassium titanate having a plurality of convex shapes and a biosoluble inorganic substance as a method for improving strength and abrasion resistance in a composition containing no copper. Friction materials characterized by containing fibers have been proposed.
引用文献１に記載の摩擦材は、複数の凸形状を有するチタン酸カリウムを含有するものであるが、複数の凸形状を有するチタン酸カリウムを含有すると、摩擦対面材となる鋳鉄表面への凝着被膜の形成が増え、静摩擦係数が大きくなり、静摩擦係数と動摩擦係数の差から生じるスティックスリップ振動が悪化するという問題が生じる。このスティックスリップ振動が大きくなると、ブレーキリリース時の異音が発生することとなる。 The friction material described in Cited Document 1 contains potassium titanate having a plurality of convex shapes, but when it contains potassium titanate having a plurality of convex shapes, it adheres to the surface of cast iron as a friction facing material. There is a problem that the formation of a film is increased, the coefficient of static friction is increased, and the stick-slip vibration caused by the difference between the coefficient of static friction and the coefficient of dynamic friction is exacerbated. If this stick-slip vibration becomes large, an abnormal noise will be generated when the brake is released.
本発明は、上記事情を鑑みなされたもので、環境負荷の高い銅を含有せず、もしくは銅を含有する場合において銅の含有量が０．５質量％以下であり、高温の耐摩耗性に優れ、異音の少ない摩擦材を提供することを目的とするものである。 The present invention has been made in view of the above circumstances, and when copper is not contained or contains copper, which has a high environmental load, the copper content is 0.5% by mass or less, and the abrasion resistance at high temperature is improved. It is an object of the present invention to provide a friction material which is excellent and has less abnormal noise.
本発明者らは、銅を含有せず、複数の凸形状を有するチタン酸カリウムを含有する組成において、高温の耐摩耗性と異音の低減を両立する組成を鋭意検討し、平均粒子径０．１〜１．０μｍの四三酸化鉄（Ｆｅ３Ｏ４）を含有させることが効果的であることを見出すとともに、小粒径の四三酸化鉄が摩擦界面を適度にクリーニングすることで、複数の凸形状を有するチタン酸カリウムが原因で発生する静摩擦係数の増大を抑制せしめ、銅を含有しない組成に於いても、高温の耐摩耗性と異音の低減が両立できることを見出した。 The present inventors diligently studied a composition that does not contain copper and contains potassium titanate having a plurality of convex shapes that achieves both high-temperature abrasion resistance and reduction of abnormal noise, and has an average particle size of 0. It was found that it is effective to contain 1 to 1.0 μm of iron trioxide (Fe 3 O 4 ), and a small particle size of iron tetraoxide properly cleans the friction interface. It has been found that the increase in the static friction coefficient caused by potassium titanate having a plurality of convex shapes is suppressed, and that high-temperature abrasion resistance and reduction of abnormal noise can be achieved at the same time even in a composition containing no copper.
本発明はこれらの知見によるものであり、本発明の摩擦材組成物は、結合材、有機充填材、無機充填材および繊維基材を含む摩擦材組成物であって、該摩擦材組成物中に元素としての銅を含まない、または銅の含有量が０．５質量％以下であり、複数の凸部形状を有するチタン酸カリウムと平均粒径が０．１〜１．０μｍの四三酸化鉄を含有することを特徴とする。
The present invention is by these findings, the friction material composition of the present invention, binder, organic fillers, a friction material composition comprising an inorganic filler and fiber base material, the friction material composition Does not contain copper as an element, or has a copper content of 0.5% by mass or less, potassium titanate having a plurality of convex shapes, and tetraoxide having an average particle size of 0.1 to 1.0 μm. It is characterized by containing iron.
本発明摩擦材組成物においては、前記四三酸化鉄の含有量が１〜８質量％であることが好ましく、前記複数の凸部形状を有するチタン酸カリウムの含有量が２〜３０質量％であることが好ましい。 In the friction material composition of the present invention, the content of iron tetraoxide is preferably 1 to 8% by mass, and the content of potassium titanate having a plurality of convex shapes is 2 to 30% by mass. It is preferable to have.
また、本発明の摩擦材は、上記の本発明の摩擦材組成物を成形してなることを特徴とするものであり、本発明の摩擦部材は、上記の本発明の摩擦材組成物を成形してなる摩擦材と裏金とを用いて形成されることを特徴とするものである。 Further, the friction material of the present invention is characterized by molding the above-mentioned friction material composition of the present invention, and the friction member of the present invention forms the above-mentioned friction material composition of the present invention. It is characterized in that it is formed by using a friction material and a backing metal.
本発明によれば、自動車用ディスクブレーキパッド等の摩擦材に用いた際に、環境負荷の高い銅を用いなくとも、高温の耐摩耗性に優れ、かつ異音の少ない摩擦材組成物、摩擦材及び摩擦部材を提供することができる。 According to the present invention, when used as a friction material for automobile disc brake pads and the like, a friction material composition and friction having excellent high-temperature wear resistance and less noise even without using copper having a high environmental load. Materials and friction members can be provided.
以下、本発明の摩擦材組成物、これを用いた摩擦材及び摩擦部材について詳述する。なお、本発明の摩擦材組成物は、ノンアスベスト摩擦材組成物である。 Hereinafter, the friction material composition of the present invention, the friction material and the friction member using the friction material composition will be described in detail. The friction material composition of the present invention is a non-asbestos friction material composition.
［摩擦材組成物］
本実施形態の摩擦材組成物は、銅を含有しない、もしくは銅を含有する場合において銅の含有量が０．５質量％以下であることを特徴とする摩擦材組成物である。
[Friction material composition]
The friction material composition of the present embodiment is a friction material composition characterized in that it does not contain copper, or when it contains copper, the content of copper is 0.5% by mass or less.
（複数の凸形状を有するチタン酸カリウム）
本発明の摩擦材組成物は、複数の凸形状を有するチタン酸塩を含む。本発明の複数の凸形状を有するチタン酸カリウムとは、不規則な方向に複数の凸部が延びる形状を有する不定形のチタン酸カリウムのことで、摩擦調整剤として用いることができることが知られている（特許文献１）。例えば、大塚化学株式会社製「テラセスＪＰ」が挙げられる。このような不規則な方向に複数の凸部が延びる形状を有する不定形のチタン酸カリウムは、凸部が摩擦材中でアンカーとなり脱落しにくいこと、凸部が相手材となるディスクに当接するので高温下においてもほどよい摩擦係数が得られることの効果を得ることができる。本発明の摩擦材組成物中における複数の凸形状を有するチタン酸カリウムの含有量は、耐摩耗性向上や異音低減の観点で１〜３０質量％が好ましく、１〜２０質量％であることがより好ましい。
(Potassium titanate with multiple convex shapes)
The friction material composition of the present invention contains a titanate having a plurality of convex shapes. The potassium titanate having a plurality of convex shapes of the present invention is an amorphous potassium titanate having a shape in which a plurality of convex portions extend in irregular directions, and it is known that it can be used as a friction modifier. (Patent Document 1). For example, "Terases JP" manufactured by Otsuka Chemical Co., Ltd. can be mentioned. The irregularly shaped potassium titanate having a shape in which a plurality of convex portions extend in such irregular directions is such that the convex portions act as anchors in the friction material and are difficult to fall off, and the convex portions abut on the disc as the mating material. Therefore, the effect of obtaining a moderate friction coefficient even at a high temperature can be obtained. The content of potassium titanate having a plurality of convex shapes in the friction material composition of the present invention is preferably 1 to 30% by mass, preferably 1 to 20% by mass, from the viewpoint of improving wear resistance and reducing abnormal noise. Is more preferable.
（四三酸化鉄）
本発明の摩擦材組成物は、上記の複数の凸形状を有するチタン酸カリウムとともに、平均粒子径０．１〜１．０μｍの四三酸化鉄を含む。四三酸化鉄は、不定形のチタン酸カリウムの添加により増大する摩擦対面材への凝着被膜をクリーニングし、スティックスリップ現象を低減する効果を有するため、上記の不規則な方向に複数の凸部が延びる形状を有する不定形のチタン酸カリウムと組み合わせて用いる。四三酸化鉄は、平均粒子径が０．１μｍに満たないものは、チタン酸カリウムによる鋳鉄表面に形成される凝着被膜を除去する効果が乏しくなる。その一方で、四三酸化鉄の平均粒子径が１．０μｍを超えると、摩擦材中の四三酸化鉄の分散が局所的となり、摩擦材全体に上記のクリーニング効果を及ぼすことが難しくなる。このため、四三酸化鉄の平均粒子径は０．１〜１．０μｍとする。このような四三酸化鉄の含有量は、異音および高温の耐摩耗性の観点で１〜８質量％が好ましい。
(Iron tetraoxide)
The friction material composition of the present invention contains iron tetraoxide having an average particle size of 0.1 to 1.0 μm together with the above-mentioned potassium titanate having a plurality of convex shapes. Since iron tetraoxide has the effect of cleaning the adhesion film on the friction facing material, which increases due to the addition of amorphous potassium titanate, and reducing the stick-slip phenomenon, a plurality of protrusions in the above irregular directions It is used in combination with an amorphous potassium titanate having an elongated shape. If the average particle size of iron tetraoxide is less than 0.1 μm, the effect of removing the adhesion film formed on the surface of cast iron by potassium titanate becomes poor. On the other hand, when the average particle size of iron tetraoxide exceeds 1.0 μm, the dispersion of iron tetraoxide in the friction material becomes local, and it becomes difficult to exert the above-mentioned cleaning effect on the entire friction material. Therefore, the average particle size of iron tetraoxide is 0.1 to 1.0 μm. The content of such triiron tetraoxide is preferably 1 to 8% by mass from the viewpoint of abnormal noise and high temperature wear resistance.
（結合材）
結合材は、摩擦材用組成物に含まれる有機充填材、無機充填材及び繊維基材などを一体化し、強度を与えるものである。本発明の摩擦材用組成物に含まれる結合材としては特に制限は無く、通常、摩擦材の結合材として用いられる熱硬化性樹脂を用いることができる。(Binder)
Binder, an organic filler contained in the friction material composition, integrated inorganic filler and fiber base material and gives strength. The binder contained in the composition for friction material of the present invention is not particularly limited, and a thermosetting resin usually used as a binder for friction material can be used.
上記熱硬化性樹脂としては、例えば、フェノール樹脂；アクリルエラストマー分散フェノール樹脂及びシリコーンエラストマー分散フェノール樹脂などの各種エラストマー分散フェノール樹脂；アクリル変性フェノール樹脂、シリコーン変性フェノール樹脂、カシュー変性フェノール樹脂、エポキシ変性フェノール樹脂及びアルキルベンゼン変性フェノール樹脂などの各種変性フェノール樹脂などが挙げられ、これらを単独で又は２種類以上を組み合わせて使用することができる。特に、良好な耐熱性、成形性及び摩擦係数を与えることから、フェノール樹脂、アクリル変性フェノール樹脂、シリコーン変性フェノール樹脂、アルキルベンゼン変性フェノール樹脂を用いることが好ましい。 Examples of the thermosetting resin include phenolic resins; various elastomer-dispersed phenolic resins such as acrylic elastomer-dispersed phenolic resins and silicone elastomer-dispersed phenolic resins; acrylic-modified phenolic resins, silicone-modified phenolic resins, cashew-modified phenolic resins, and epoxy-modified phenolic resins. Examples thereof include resins and various modified phenolic resins such as alkylbenzene-modified phenolic resins, and these can be used alone or in combination of two or more. In particular, it is preferable to use a phenol resin, an acrylic-modified phenol resin, a silicone-modified phenol resin, or an alkylbenzene-modified phenol resin because it provides good heat resistance, moldability, and a coefficient of friction.
本発明の摩擦材組成物中における、結合材の含有量は、５〜２０質量％であることが好ましく、５〜１０質量％であることがより好ましい。結合材の含有量を５〜２０質量％の範囲とすることで、摩擦材の強度低下をより抑制でき、また、摩擦材の気孔率が減少し、弾性率が高くなることによる鳴きなどの音振性能悪化をより抑制できる。 The content of the binder in the friction material composition of the present invention is preferably 5 to 20% by mass, and more preferably 5 to 10% by mass. By setting the content of the binder in the range of 5 to 20% by mass, it is possible to further suppress the decrease in the strength of the friction material, and the porosity of the friction material is reduced and the elastic modulus is increased, resulting in noise such as squealing. Deterioration of vibration performance can be further suppressed.
（有機充填剤）
有機充填材は、摩擦材の音振性能や耐摩耗性などを向上させるための摩擦調整剤として含まれるものである。本発明の摩擦材組成物に含まれる有機充填材としては、上記性能を発揮できるものであれば特に制限はなく、通常、有機充填材として用いられる、カシューダストやゴム成分などを用いることができる。
(Organic filler)
The organic filler is contained as a friction modifier for improving the sound vibration performance and wear resistance of the friction material. The organic filler contained in the friction material composition of the present invention is not particularly limited as long as it can exhibit the above performance, and cashew dust, a rubber component, or the like, which is usually used as an organic filler, can be used. ..
上記カシューダストは、カシューナッツシェルオイルを硬化させたものを粉砕して得られる、通常、摩擦材に用いられるものであればよい。 The cashew dust may be any one usually used as a friction material, which is obtained by crushing a hardened cashew nut shell oil.
上記ゴム成分としては、例えば、タイヤゴム、アクリルゴム、イソプレンゴム、ＮＢＲ（ニトリルブタジエンゴム）、ＳＢＲ（スチレンブタジエンゴム）、塩素化ブチルゴム、ブチルゴム、シリコーンゴム、などが挙げられ、これらを単独で又は２種類以上を組み合わせて使用される。 Examples of the rubber component include tire rubber, acrylic rubber, isoprene rubber, NBR (nitrile butadiene rubber), SBR (styrene butadiene rubber), chlorinated butyl rubber, butyl rubber, silicone rubber, and the like, and these may be used alone or 2 Used in combination of more than one type.
本発明の摩擦材組成物中における、有機充填材の含有量は、１〜２０質量％であることが好ましく、１〜１０質量％であることがより好ましく、３〜８質量％であることが特に好ましい。有機充填材の含有量を１〜２０質量％の範囲とすることで、摩擦材の弾性率が高くなること、鳴きなどの音振性能の悪化を避けることができ、また耐熱性の悪化、熱履歴による強度低下を避けることができる。 The content of the organic filler in the friction material composition of the present invention is preferably 1 to 20% by mass, more preferably 1 to 10% by mass, and preferably 3 to 8% by mass. Especially preferable. By setting the content of the organic filler in the range of 1 to 20% by mass, the elastic modulus of the friction material becomes high, deterioration of sound vibration performance such as squeal can be avoided, and deterioration of heat resistance and heat can be avoided. It is possible to avoid a decrease in strength due to history.
（無機充填材）
無機充填材は、摩擦材の耐熱性の悪化を避けるためや、耐摩耗性を向上させるため、摩擦係数を向上する目的で添加される摩擦調整剤として含まれるものである。本発明の摩擦材用組成物は、通常、摩擦材に用いられる無機充填剤であれば特に制限はない。
(Inorganic filler)
The inorganic filler is contained as a friction modifier added for the purpose of improving the friction coefficient in order to avoid deterioration of the heat resistance of the friction material and to improve the wear resistance. The composition for a friction material of the present invention is not particularly limited as long as it is an inorganic filler usually used for the friction material.
上記無機充填材としては、例えば、硫化錫、二硫化モリブデン、硫化鉄、三硫化アンチモン、硫化ビスマス、硫化亜鉛、水酸化カルシウム、酸化カルシウム、炭酸ナトリウム、硫酸バリウム、コークス、黒鉛、マイカ、バーミキュライト、硫酸カルシウム、タルク、クレー、ゼオライト、ムライト、クロマイト、酸化チタン、酸化マグネシウム、シリカ、ドロマイト、炭酸カルシウム、炭酸マグネシウム、γアルミナ、珪酸ジルコニウム、二酸化マンガン、酸化亜鉛、酸化セリウム、ジルコニアなどを用いることができ、これらを単独で又は２種類以上を組み合わせて使用することができる。また、前記複数の凸形状を有するチタン酸カリウムの他に、粒状または板状のチタン酸塩を組合わせて用いることができる。粒状または板状のチタン酸塩としては、６チタン酸カリウム、８チタン酸カリウム、チタン酸リチウムカリウム、チタン酸マグネシウムカリウム、チタン酸ナトリウムなどを用いることができる。 Examples of the inorganic filler include tin sulfide, molybdenum disulfide, iron sulfide, antimony trisulfide, bismuth sulfide, zinc sulfide, calcium hydroxide, calcium oxide, sodium carbonate, barium sulfate, coke, graphite, mica, vermiculite, and the like. Calcium sulfate, talc, clay, zeolite, mullite, chromate, titanium oxide, magnesium oxide, silica, dolomite, calcium carbonate, magnesium carbonate, γ-alumina, zirconium silicate, manganese dioxide, zinc oxide, cerium oxide, zirconia, etc. can be used. These can be used alone or in combination of two or more. Further, in addition to the above-mentioned potassium titanate having a plurality of convex shapes, granular or plate-shaped titanate can be used in combination. As the granular or plate-shaped titanate, potassium hexatitanate, potassium octatate, lithium titanate, magnesium magnesium titanate, sodium titanate and the like can be used.
本発明の摩擦材組成物中における、無機充填材の含有量は、３０〜８０質量％であることが好ましく、４０〜７０質量％であることがより好ましく、５０〜６０質量％であることが特に好ましい。無機充填材の含有量を３０〜８０質量％の範囲とすることで、耐熱性の悪化を避けることができ、摩擦材のその他成分の含有量バランスの点でも好ましい。 The content of the inorganic filler in the friction material composition of the present invention is preferably 30 to 80% by mass, more preferably 40 to 70% by mass, and preferably 50 to 60% by mass. Especially preferable. By setting the content of the inorganic filler in the range of 30 to 80% by mass, deterioration of heat resistance can be avoided, and it is also preferable in terms of the content balance of other components of the friction material.
（繊維基材）
繊維基材は、摩擦材において補強作用を示すものである。
(Fiber base material)
The fiber base material exhibits a reinforcing action in the friction material.
本発明の摩擦材組成物は、通常、繊維基材として用いられる、無機繊維、金属繊維、有機繊維、炭素系繊維などを用いることができ、これらを単独で又は二種類以上を組み合わせて使用することができる。 In the friction material composition of the present invention, inorganic fibers, metal fibers, organic fibers, carbon-based fibers and the like, which are usually used as a fiber base material, can be used, and these are used alone or in combination of two or more. be able to.
上記無機繊維としては、セラミック繊維、生分解性セラミック繊維、鉱物繊維、ガラス繊維、シリケート繊維などを用いることができ、１種又は２種以上を組み合わせて用いることができる。これら、無機繊維の中では、ＳｉＯ２、Ａｌ２Ｏ３、ＣａＯ、ＭｇＯ、ＦｅＯ、Ｎａ２Ｏなどを任意の組み合わせで含有した生分解性鉱物繊維が好ましく、市販品としてはLAPINUS FIBERS B.V製のRoxulシリーズなどが挙げられる。 As the inorganic fiber, ceramic fiber, biodegradable ceramic fiber, mineral fiber, glass fiber, silicate fiber and the like can be used, and one kind or a combination of two or more kinds can be used. Among these inorganic fibers, biodegradable mineral fibers containing SiO 2 , Al 2 O 3 , CaO, MgO, FeO, Na 2 O, etc. in any combination are preferable, and commercially available products are manufactured by LAPINUS FIBERS BV. Examples include the Roxul series.
上記金属繊維としては、通常、摩擦材に用いられるものであれば特に制限はないが、例えば、アルミ、鉄、亜鉛、錫、チタン、ニッケル、マグネシウム、シリコンなどの銅および銅合金以外の金属単体又は合金形態の繊維や、鋳鉄繊維などの金属を主成分とする繊維が挙げられる。 The metal fiber is not particularly limited as long as it is usually used as a friction material, but for example, a simple substance of a metal other than copper and a copper alloy such as aluminum, iron, zinc, tin, titanium, nickel, magnesium and silicon. Alternatively, alloy-type fibers and fibers mainly composed of metal such as cast iron fibers can be mentioned.
なお、本発明品は、環境有害性の高い銅及び銅合金を実質的に含有せず、元素としての銅の含有量が０．５重量％以下であり、好ましくは含有量０質量％である。 The product of the present invention does not substantially contain copper and copper alloy, which are highly harmful to the environment, and the content of copper as an element is 0.5% by weight or less, preferably 0% by mass. ..
上記有機繊維としては、アラミド繊維、セルロース繊維、アクリル繊維、フェノール樹脂繊維などを用いることができ、これらを単独で又は２種類以上を組み合わせて使用することができる。 As the organic fiber, aramid fiber, cellulose fiber, acrylic fiber, phenol resin fiber and the like can be used, and these can be used alone or in combination of two or more kinds.
上記炭素系繊維としては、耐炎化繊維、ピッチ系炭素繊維、ＰＡＮ系炭素繊維、活性炭繊維などを用いることができ、これらを単独で又は２種類以上を組み合わせて使用することができる。 As the carbon-based fiber, flame-resistant fiber, pitch-based carbon fiber, PAN-based carbon fiber, activated carbon fiber and the like can be used, and these can be used alone or in combination of two or more.
本発明の摩擦材組成物における、繊維基材の含有量は、摩擦材組成物において５〜４０質量％であることが好ましく、５〜２０質量％であることがより好ましく、５〜１５質量％であることが特に好ましい。繊維基材の含有量を５〜４０質量％の範囲とすることで、摩擦材としての最適な気孔率が得られ、鳴き防止ができ、適正な材料強度が得られ、耐摩耗性を発現し、成形性をよくすることができる。 The content of the fiber base material in the friction material composition of the present invention is preferably 5 to 40% by mass, more preferably 5 to 20% by mass, and 5 to 15% by mass in the friction material composition. Is particularly preferable. By setting the content of the fiber base material in the range of 5 to 40% by mass, the optimum porosity as a friction material can be obtained, squeal can be prevented, appropriate material strength can be obtained, and wear resistance is exhibited. , The moldability can be improved.
［摩擦材］
本実施形態の摩擦材は、本発明の摩擦材組成物を一般に使用されている方法で成形して製造することができ、好ましくは加熱加圧成形して製造される。詳細には、例えば、本発明の摩擦材組成物をレーディゲミキサー（「レーディゲ」は登録商標）、加圧ニーダー、アイリッヒミキサー（「アイリッヒ」は登録商標）等の混合機を用いて均一に混合し、この混合物を成形金型にて予備成形し、得られた予備成形物を成形温度１３０〜１６０℃、成形圧力２０〜５０ＭＰａ、成形時間２〜１０分間の条件で成形し、得られた成形物を１５０〜２５０℃で２〜１０時間熱処理することで製造される。また更に、必要に応じて塗装、スコーチ処理、研磨処理を行うことで製造される。
[Friction material]
The friction material of the present embodiment can be produced by molding the friction material composition of the present invention by a commonly used method, and is preferably produced by heat and pressure molding. Specifically, for example, the friction material composition of the present invention is uniformly mixed using a mixer such as a Reedige mixer (“Reidigue” is a registered trademark), a pressurized kneader, and an Erich mixer (“Eirich” is a registered trademark). This mixture is premolded with a molding mold, and the obtained premolded product is molded under the conditions of a molding temperature of 130 to 160 ° C., a molding pressure of 20 to 50 MPa, and a molding time of 2 to 10 minutes. It is produced by heat-treating the molded product at 150 to 250 ° C. for 2 to 10 hours. Furthermore, it is manufactured by performing painting, scorch treatment, and polishing treatment as necessary.
［摩擦部材］
本実施形態の摩擦部材は、上記の本実施形態の摩擦材を摩擦面となる摩擦材として用いてなる。上記摩擦部材としては、例えば、下記の構成が挙げられる。
（１）摩擦材のみの構成
（２）裏金と、該裏金の上に摩擦面となる本発明の摩擦材組成物からなる摩擦材とを有する構成
（３）上記（２）の構成において、裏金と摩擦材との間に、裏金の接着効果を高めるための表面改質を目的としたプライマー層、及び、裏金と摩擦材との接着を目的とした接着層を更に介在させた構成
[Friction member]
The friction member of the present embodiment uses the above-mentioned friction material of the present embodiment as a friction material serving as a friction surface. Examples of the friction member include the following configurations.
(1) Composition of only friction material (2) Structure having a back metal and a friction material composed of the friction material composition of the present invention serving as a friction surface on the back metal (3) In the configuration of (2) above, the back metal A primer layer for surface modification to enhance the adhesive effect of the back metal and an adhesive layer for bonding the back metal and the friction material are further interposed between the back metal and the friction material.
上記裏金は、摩擦部材の機械的強度の向上のために、通常、摩擦部材として用いるものであり、材質としては、金属又は繊維強化プラスチック等、具体的には、鉄、ステンレス、無機繊維強化プラスチック、炭素繊維強化プラスチック等が挙げられる。プライマー層及び接着層は、通常、ブレーキシュー等の摩擦部材に用いられるものであればよい。 The back metal is usually used as a friction member in order to improve the mechanical strength of the friction member, and the material is metal, fiber reinforced plastic, or the like, specifically iron, stainless steel, or inorganic fiber reinforced plastic. , Carbon fiber reinforced plastic and the like. The primer layer and the adhesive layer may be those usually used for friction members such as brake shoes.
本実施形態の摩擦材組成物は、異音が少なく、耐摩耗性等に優れるため、自動車等のディスクブレーキパッドやブレーキライニング等の上張り材として特に有用であるが、摩擦部材の下張り材として成形して用いることもできる。なお、「上張り材」とは、摩擦部材の摩擦面となる摩擦材であり、「下張り材」とは、摩擦部材の摩擦面となる摩擦材と裏金との間に介在する、摩擦材と裏金との接着部付近のせん断強度、耐クラック性向上等を目的とした層のことである。 The friction material composition of the present embodiment has less abnormal noise and is excellent in wear resistance and the like, and is therefore particularly useful as an upholstery material for disc brake pads and brake linings of automobiles and the like, but as an underlay material for friction members. It can also be molded and used. The "upholstery material" is a friction material that serves as a friction surface of the friction member, and the "underlay material" is a friction material that is interposed between the friction material that is the friction surface of the friction member and the back metal. It is a layer for the purpose of improving shear strength and crack resistance in the vicinity of the adhesive portion with the back metal.
以下、本発明の摩擦材組成物、摩擦材及び摩擦部材について、実施例及び比較例を用いて更に詳細に説明するが、本発明は何らこれらに制限されるものではない。 Hereinafter, the friction material composition, the friction material, and the friction member of the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.
［実施例１〜５及び比較例１〜３］
（ディスクブレーキパッドの作製）
表１に示す配合比率に従って材料を配合し、実施例１〜５及び比較例１〜３の摩擦材組成物を得た。実施例および比較例にて用いた複数の凸部形状を有するチタン酸カリウムは、大塚化学株式会社製「テラセスＪＰ」を用いた。なお、表中の配合比率は質量％である。また、実施例で用いた四三酸化鉄は、（戸田工業株式会社製「ＢＰ３０３Ｃ」 平均粒子径０．３μｍ）を用いた。この摩擦材組成物をレーディゲミキサー（株式会社マツボー製、商品名：レーディゲミキサーＭ２０）で混合し、得られた混合物を成形プレス（王子機械工業株式会社製）で予備成形した。得られた予備成形物を成形温度１４０〜１６０℃、成形圧力３０ＭＰａ、成形時間５分間の条件で、成形プレス（三起精工株式会社製）を用いて鉄製の裏金（日立オートモティブシステムズ株式会社製）と共に加熱加圧成形した。得られた成形品を２００℃で４．５時間熱処理し、ロータリー研磨機を用いて研磨し、５００℃のスコーチ処理を行って、実施例１〜４及び比較例１〜２のディスクブレーキパッドを得た。なお、実施例及び比較例では、裏金の厚さ６ｍｍ、摩擦材の厚さ１１ｍｍ、摩擦材投影面積５２ｃｍ２のディスクブレーキパッドを作製した。
[Examples 1 to 5 and Comparative Examples 1 to 3]
(Making disc brake pads)
The materials were blended according to the blending ratios shown in Table 1 to obtain friction material compositions of Examples 1 to 5 and Comparative Examples 1 to 3. As the potassium titanate having a plurality of convex shapes used in Examples and Comparative Examples, "Teraces JP" manufactured by Otsuka Chemical Co., Ltd. was used. The blending ratio in the table is mass%. Further, as the iron tetraoxide used in the examples, (“BP303C” manufactured by Toda Kogyo Co., Ltd., average particle diameter 0.3 μm) was used. This friction material composition was mixed with a Ladyge mixer (manufactured by Matsubo Co., Ltd., trade name: Ladyge mixer M20), and the obtained mixture was premolded with a molding press (manufactured by Oji Machinery Co., Ltd.). An iron backing metal (manufactured by Hitachi Automotive Systems Co., Ltd.) was used to mold the obtained preformed product under the conditions of a molding temperature of 140 to 160 ° C., a molding pressure of 30 MPa, and a molding time of 5 minutes using a molding press (manufactured by Sanki Seiko Co., Ltd.). And heat and pressure molding. The obtained molded product is heat-treated at 200 ° C. for 4.5 hours, polished using a rotary polishing machine, and scorch-treated at 500 ° C. to obtain disc brake pads of Examples 1 to 4 and Comparative Examples 1 and 2. Obtained. In the examples and comparative examples, disc brake pads having a back metal thickness of 6 mm, a friction material thickness of 11 mm, and a friction material projection area of 52 cm 2 were produced.
（異音の評価）
ブレーキリリース時の異音が顕著に大きくなる、一晩放置後の評価を行った。市内走行１０００ｋｍ後、夜間一晩駐車し、翌朝エンジン始動直後にブレーキリリースし、発生した異音（クリープグローン）の車内音圧を評価した。
(Evaluation of abnormal noise)
The evaluation was performed after leaving the vehicle overnight, in which the abnormal noise when the brake was released became significantly louder. After 1000 km of driving in the city, the car was parked overnight at night, the brake was released immediately after the engine was started the next morning, and the sound pressure inside the car of the generated abnormal noise (creep grown) was evaluated.
（高温での耐摩耗性の評価）
高温での耐摩耗性は、自動車技術会規格ＪＡＳＯ Ｃ４２７に基づき測定し、ブレーキ温度５００℃、車速５０ｋｍ／ｈ、減速度０．３Ｇの制動１０００回相当の摩擦材の摩耗量を評価し、高温での耐摩耗性とした。
(Evaluation of wear resistance at high temperature)
The wear resistance at high temperature is measured based on the standard JASO C427 of the Society of Automotive Engineers of Japan, and the amount of wear of the friction material equivalent to 1000 times of braking at a brake temperature of 500 ° C., a vehicle speed of 50 km / h, and a deceleration of 0.3 G is evaluated. Abrasion resistance in.
なお、上記耐摩耗性の評価はダイナモメーターを用い、イナーシャ７ｋｇｆ・ｍ・ｓｅｃ２で評価を行った。また、ベンチレーテッドディスクロータ（（株）キリウ製、材質ＦＣ１９０）、一般的なピンスライド式のコレットタイプのキャリパを用いて実施した。 The wear resistance was evaluated with an inertia of 7 kgf · m · sec 2 using a dynamometer. In addition, a ventilated disc rotor (manufactured by Kiriu Co., Ltd., material FC190) and a general pin slide type collet type caliper were used.
実施例１〜５は、銅を含有する比較例１より高温の耐摩耗性が優れ、かつ異音の発生音圧が小さい。また、実施例１〜５は、銅を含有せず、複数の凸部形状を有するチタン酸カリウム、小粒径の四三酸化鉄も含有しない比較例２に対して高温の耐摩耗性に優れる。また、実施例１〜５は、複数の凸部形状を有するチタン酸カリウムを含有し、かつ銅や小粒径の四三酸化鉄を含有しない比較例３に対して異音の発生音圧が小さいことは明らかである。 Examples 1 to 5 have better wear resistance at high temperatures than Comparative Example 1 containing copper, and generate less abnormal noise. Further, Examples 1 to 5 are excellent in high-temperature wear resistance as compared with Comparative Example 2 which does not contain copper and does not contain potassium titanate having a plurality of convex shapes and iron tetraoxide having a small particle size. .. Further, in Examples 1 to 5, the sound pressure at which abnormal noise is generated is higher than that in Comparative Example 3, which contains potassium titanate having a plurality of convex shapes and does not contain copper or iron tetraoxide having a small particle size. It is clear that it is small.
本発明の摩擦材組成物は、従来品と比較して、環境負荷の高い銅を用いなくとも、高温の耐摩耗性に優れ、かつ異音の発生が少ないため、該摩擦材組成物は乗用車用ブレーキパッド等の摩擦材及び摩擦部材に好適である。 Compared with the conventional product, the friction material composition of the present invention is excellent in high temperature wear resistance and less generation of abnormal noise even without using copper having a high environmental load. Therefore, the friction material composition is used for passenger cars. Suitable for friction materials such as brake pads and friction members.
Claims (7)
該摩擦材組成物中に元素としての銅を含まない、または銅の含有量が０．５質量％以下であり、
複数の凸部形状を有するチタン酸カリウムと
平均粒径０．１〜１．０μｍの四三酸化鉄を含有し、
前記四三酸化鉄の含有量が１〜３質量％であり、
前記複数の凸部形状を有するチタン酸カリウムの含有量が２〜３０質量％であることを特徴とする摩擦材組成物。 Binder, an organic filler, a friction material composition comprising an inorganic filler and fibrous substrates,
The friction material composition does not contain copper as an element, or the copper content is 0.5% by mass or less.
It contains potassium titanate having a plurality of convex shapes and iron tetraoxide having an average particle size of 0.1 to 1.0 μm .
The content of iron tetraoxide is 1 to 3% by mass.
The friction material composition, wherein the content of potassium titanate having a plurality of convex shapes is 2 to 30% by mass .
A friction member formed by using a friction material obtained by molding the friction material composition according to any one of claims 1 to 5 and a back metal.
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