WO2021014901A1 - オイルシール用コーティング剤 - Google Patents
オイルシール用コーティング剤 Download PDFInfo
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- WO2021014901A1 WO2021014901A1 PCT/JP2020/025687 JP2020025687W WO2021014901A1 WO 2021014901 A1 WO2021014901 A1 WO 2021014901A1 JP 2020025687 W JP2020025687 W JP 2020025687W WO 2021014901 A1 WO2021014901 A1 WO 2021014901A1
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- WIPO (PCT)
- Prior art keywords
- weight
- coating agent
- parts
- oil seal
- particles
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D191/00—Coating compositions based on oils, fats or waxes; Coating compositions based on derivatives thereof
- C09D191/06—Waxes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
- C08L91/06—Waxes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D109/00—Coating compositions based on homopolymers or copolymers of conjugated diene hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D115/00—Coating compositions based on rubber derivatives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/66—Additives characterised by particle size
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/66—Additives characterised by particle size
- C09D7/69—Particle size larger than 1000 nm
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/324—Arrangements for lubrication or cooling of the sealing itself
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
Definitions
- the present invention relates to a coating agent for oil seals. More specifically, the present invention relates to a coating agent for an oil seal having excellent dispersibility of a filler.
- Oil seals are widely used as important machine elements in the fields of automobiles, industrial machinery, etc. Oil seals are used for exercise and sliding applications, but in that case, deterioration of the sealing oil and sealing material due to frictional heat of the seal and energy loss of equipment due to frictional resistance often become problems.
- Patent Documents 1 and 2 The applicant has previously referred to Patent Documents 1 and 2 to use 10 parts by weight of 1,2-polybutadiene containing an isocyanate group and 10 parts of a wax and a fluororesin having a softening point of 40 to 160 ° C. or both of them and a polyethylene resin.
- a surface treatment agent for vulcanized rubber which is prepared as an organic solvent solution by containing it in a proportion of up to 160 parts by weight. These are said to be effectively applied to oil seals and the like, but further low torque performance is required.
- Applicants further added 10 to 160 weights of fluororesin, silica, silicone resin or polycarbonate filler having a particle size of 0.5 to 30 ⁇ m with respect to 100 parts by weight of 1,2-polybutadiene containing an isocyanate group.
- a coating agent for oil sealing which is a coating agent prepared as an organic solvent solution by containing it in a proportion of parts, and the contact angle between the surface of the base material coated with this and the engine oil is less than 35 °.
- further improvement is required for the dispersibility of the PTFE filler, which is a fluororesin (Patent Document 3).
- a dispersant is added in order to improve the dispersibility of PTFE, but if the amount added is large, the strength of the film formed from the coating agent is lowered. Therefore, it is difficult to balance the strength of the coating agent and its dispersibility.
- An object of the present invention is to provide a coating agent having improved wear resistance while maintaining the roughness of the coating surface to which the coating agent is applied.
- An object of the present invention is to provide fluororesin particles having a particle size of 2 ⁇ m or less and filler particles other than fluororesin particles having a particle size of 0.5 to 30 ⁇ m with respect to 100 parts by weight of 1,2-polybutadiene containing an isocyanate group.
- a coating agent is applied by using a fluororesin particle having a particle size of 2 ⁇ m or less and a filler particle other than the fluororesin particle having a particle size of 0.5 to 30 ⁇ m in combination. It has an excellent effect of ensuring the roughness of the surface and making it possible to improve the abrasion resistance.
- the wettability of the coated surface with oil is improved and the coefficient of dynamic friction in the oil is lowered. Since it can be used, it has an excellent effect such as achieving low torque of the oil seal.
- isocyanate group-containing 1,2-polybutadiene one having an isocyanate group added as a terminal group having a molecular weight of about 1,000 to 3,000 is used, and this is a commercially available product, for example, Nippon Soda product Nisso TP-1001 (butyl acetate 50 weight). % Containing solution) or the like can be used as it is. Since an isocyanate group is added as a terminal group, it can react with a functional group or a hydroxyl group-containing component on the surface of the vulcanized rubber to adhere and cure.
- This polybutadiene resin has better compatibility and compatibility with rubber than polyurethane resin which reacts with the same isocyanate group and polymerizes, so it has good adhesion to rubber, and especially good abrasion resistance and abrasion resistance. Is a feature.
- the filler includes fluororesin particles having a particle size of 2 ⁇ m or less, preferably 0.5 ⁇ m or less, and filler particles other than the fluororesin particles having a particle size of 0.5 to 30 ⁇ m, preferably 1 to 20 ⁇ m.
- the (total filler amount) is 10 to 90 parts by weight, preferably 40 to 80 parts by weight, based on 100 parts by weight of 1,2-polybutadiene containing an isocyanate group, and the fluororesin particles are 20 to 20 to 80 parts by weight of the total filler amount. It is used in a proportion of 80% by weight, preferably 30 to 70% by weight.
- the total amount of the filler is larger than this, the adhesion of the coating film to the rubber, the abrasion resistance and the wear resistance will be deteriorated, and the flexibility of the coating film will be impaired, and the coating film after curing will be cracked. Will occur.
- the slipperiness becomes poor, the surface roughness of the coating film becomes small, the oil holding capacity becomes small, and the torque becomes high.
- Fluororesin particles make it possible to form a coating film with excellent wear resistance, and even with a small amount of compounding, the effect can be exhibited, and the durability of the coating agent can be improved. Further, the filler particles other than the fluororesin particles can improve the wettability with oil by increasing the roughness of the coating surface, and can reduce the friction coefficient in oil.
- the particle size of the fluororesin particles is larger than this, the aggregation of the fluororesin particles becomes large, and it becomes difficult to control the surface roughness of the coating film.
- the size of the agglomerates exceeds 30 ⁇ m, the roughness of the coating surface becomes large, the sealing property is deteriorated, and oil leakage occurs.
- the fluororesin particles have a high specific gravity, and when the particle size is large, the effect of the dispersant cannot be exerted, so that precipitation occurs and the stability of the coating liquid is also impaired.
- the particle size of the filler particles other than the fluororesin is smaller than about 0.5 ⁇ m, the roughness of the coating surface becomes small, the effect of retaining oil cannot be maintained, and the torque of the sealing sliding surface becomes high after all. turn into. On the other hand, if the particle size is larger than this, the roughness of the coating surface becomes large, the sealing property deteriorates, and oil leakage occurs.
- the wear resistance deteriorates, while if it is used in a ratio of more than about 80% by weight, the surface roughness of the coating film becomes small and the oil The holding capacity of the particles is reduced, the oil repellency is increased, and the torque is increased.
- both the contact angle with the engine oil and the coefficient of friction tend to increase.
- Fluororesin includes polytetrafluoroethylene [PTFE], tetrafluoroethylene / hexafluoropropylene copolymer, tetrafluoroethylene / perfluoro (alkyl vinyl ether) copolymer, polyvinylidene fluoride, polyvinyl fluoride, ethylene / tetrafluoro Examples include an ethylene copolymer.
- PTFE polytetrafluoroethylene
- tetrafluoroethylene / hexafluoropropylene copolymer tetrafluoroethylene / perfluoro (alkyl vinyl ether) copolymer
- polyvinylidene fluoride polyvinyl fluoride
- ethylene / tetrafluoro Examples include an ethylene copolymer.
- fluororesin particles examples include those obtained by classifying fluororesins obtained by a massive polymerization method, a suspension polymerization method, a solution polymerization method, an emulsion polymerization method, etc. to a particle size of about 0.1 to 2 ⁇ m, or a suspension polymerization method.
- the dispersion obtained by the solution polymerization method, the emulsion polymerization method, etc. is dispersed into fine particles to about 0.1 to 2 ⁇ m by shear stirring, etc., and the one obtained by the above polymerization method is coagulated and dried, and then dried and pulverized. And those that have been made into fine particles of about 2 ⁇ m or less by cooling and crushing are used.
- filler particles other than fluororesin examples include particles such as silica, silicone resin, silicone rubber, polycarbonate, urethane resin, acrylic resin, carbon black, and polymethylsilsesquioxane (methyltrimethoxysilane polymer). Be done.
- the particle size of these filler particles is measured in accordance with JIS Z8825, which corresponds to ISO 13320.
- wax is further used at a ratio of 10 to 40 parts by weight, preferably 10 to 30 parts by weight, based on 100 parts by weight of 1,2-polybutadiene containing an isocyanate group. If the wax is used in a smaller proportion, the abrasion resistance is lowered, and it becomes difficult to control the precipitation of the fluororesin particles and the generation of the precipitation of the silicone resin. On the other hand, if it is used in a larger proportion than this, the coating agent is softened and the wear resistance is lowered.
- the use of wax improves the wear resistance of the coating film, and since it has a low specific gravity, it is possible to prevent the fluororesin particles from aggregating and precipitating by mixing with the fluororesin particles.
- wax plant wax, petroleum wax, synthetic wax, etc. having a melting point of about 40 to 160 ° C, preferably about 60 to 120 ° C are used.
- Etc., and usually a commercially available wax having a predetermined melting point can be used as it is.
- the wax will melt when the coating agent is baked and will be uniformly dispersed in the binder resin. If a wax having a melting point higher than this is used, it may not melt after the coating is baked, and the agglomerated wax portion may cause a decrease in adhesion to the substrate. On the other hand, if a wax having a melting point lower than this is used, The wax component may come off due to the high temperature environment when the product is used, and the abrasion resistance and wear characteristics of the coating agent may deteriorate.
- the above components are prepared as a solution (dispersion liquid) of an organic solvent and used as a coating agent for oil seals.
- organic solvent toluene, xylene, ethyl acetate, butyl acetate, methyl ethyl ketone, methyl isobutyl ketone and the like are used, and generally commercially available solvents can be used as they are.
- the amount of dilution with the organic solvent is appropriately selected according to the coating thickness and the coating method.
- the coating thickness is usually about 1 to 30 ⁇ m, preferably about 3 to 20 ⁇ m, and if the coating thickness is smaller than this, the entire rubber surface cannot be covered, and slipperiness and non-adhesiveness are impaired. Sometimes. On the other hand, if the coating thickness is larger than this, the rigidity of the coating surface becomes high, and the sealing property and flexibility may be impaired. For applications such as sealing parts, it is preferably about 3 to 20 ⁇ m.
- the contact angle between the oil seal surface finally prepared as a coating agent for an organic solvent solution, coated on the oil seal surface, and then the coated oil seal surface with engine oil such as engine oil OW-20 is 35 °. Those that are less than are used. If filler particles with a larger contact angle after coating are used, the oil will be repelled, the oil holding power of the oil seal sliding surface will be impaired, and the desired low torque performance will be achieved. It becomes difficult to do.
- Examples of the rubber constituting the oil seal that can be treated with such a coating agent include fluororubber, nitrile rubber, hydride nitrile rubber, ethylene-propylene rubber, sterene-butadiene rubber, acrylic rubber, chloroprene rubber, butyl rubber, and natural rubber.
- Examples thereof include general rubber materials, and among these, a rubber material having less blooming on the rubber surface layer of an antiaging agent and a rubber compounding agent such as oil is preferably used.
- the blending ratio of each of the above components, the type of organic solvent, the amount of organic solvent, and the mixing ratio of organic solvent are appropriately selected according to the rubber material and purpose.
- Examples of the method of applying the coating agent to the oil seal surface include, but are not limited to, dipping, spraying, roll coater, flow coater, and the like. At this time, it is preferable to remove stains on the rubber surface by cleaning or the like before applying the coating agent. In particular, when blooms and bleeds are deposited on the surface of the rubber, they are washed and dried with water, detergent, solvent or the like.
- heat treatment is performed at about 150 to 250 ° C for about 10 minutes to 24 hours.
- the heating temperature is lower than this and the heating time is shorter than this, the curing of the film and the adhesion to the rubber are insufficient, and the non-adhesiveness and slipperiness are deteriorated.
- the heating temperature is higher than this and the heating time is longer than this, heat aging of the rubber will occur. Therefore, it is necessary to appropriately set the heating temperature and the heating time according to the heat resistance of various rubbers.
- heat treatment In the case of items that require a reduction in the amount of outgas, heat treatment, decompression treatment, extraction treatment, etc. can be performed alone or in combination, but heat treatment is the best economically, and the amount of outgas can be reduced. It is preferable to heat-treat at about 150 to 250 ° C. for about 1 to 24 hours, and the higher the temperature and the longer the time, in order to gasify the low molecular weight components in the rubber and the low molecular weight components contained in the polybutadiene in the film. Is more effective the longer it is.
- Example 1 200 parts by weight of 1,2-polybutadiene containing isocyanate group (Nippon Soda product TP1001; containing 50% by weight of butyl acetate) (100 ⁇ ) Polymethylsilsesquioxane particles 30 ⁇ (Momentive product Tospearl 130; particle size 3 ⁇ m) Polytetrafluoroethylene particles 30 ⁇ (AGC Sei Chemical Product Fluon 172J; Particle Diameter 0.2 ⁇ m) Paraffin wax (melting point 100 °C) 20 ⁇ Butyl acetate (remaining) ⁇ 2000 ⁇ in total
- each of the above components is mixed, and a coating agent solution consisting of these butyl acetate solutions is spray-coated on a vulcanized rubber having a thickness of 2 mm to a thickness of 10 to 30 ⁇ m, heat-treated at 200 ° C. for 10 hours, and then contacted.
- the corners, coefficient of dynamic friction in oil and wear resistance were measured or evaluated.
- the dispersibility of the coating liquid was also evaluated.
- each part by weight is shown by the part by weight of solution, and the part by weight of each component is shown in parentheses (the same applies to the following Examples and Comparative Examples).
- Dispersibility After preparing the coating liquid, the settling speed of the fluororesin particles was visually confirmed, and those with no settling after 10 minutes were evaluated as ⁇ , and those with settling within less than 10 minutes were evaluated as ⁇ .
- Contact angle Using Drop Master 500 manufactured by Kyowa Interface Science, engine oil OW-20 Measure the contact angle with respect to, and evaluate less than 35 ° as ⁇ and 35 ° or more as ⁇ .
- Dynamic friction coefficient in oil Using a HEIDON TYPE14DR surface tester manufactured by Shinto Kagaku, reciprocate under the following conditions and perform the outward route.
- the dynamic friction coefficient in oil is an evaluation that correlates with the actual machine evaluation of the oil seal, and if the dynamic friction coefficient in oil using the above test piece is low, the actual machine evaluation using the oil seal will also be good.
- Abrasion resistance Using the friction player FPR-2000 manufactured by Resca, a SUS pin with a coefficient of 0.4 mm is placed on the surface of the coating film in a dry state at 80 ° C. Press with a load of 300 g and rotate at a linear speed of 400 mm / sec. Measure the distance until the coating film peels off and the rubber is exposed, and evaluates 0.1 km or more as ⁇ and less than 0.1 km as ⁇ .
- Example 2 In Example 1, amorphous silicon dioxide particles (central silica product silica 6B; particle diameter 7 ⁇ m) were used in the same amount (30 parts by weight) instead of the polymethylsilsesquioxane particles.
- Example 3 In Example 1, the amount of polymethylsilsesquioxane particles was changed to 56 parts by weight, and the amount of polytetrafluoroethylene particles was changed to 24 parts by weight.
- Example 4 In Example 1, the amount of polymethylsilsesquioxane particles was changed to 24 parts by weight, and the amount of polytetrafluoroethylene particles was changed to 56 parts by weight.
- Example 1 Comparative Example 1 In Example 1, the amount of polymethylsilsesquioxane particles was changed to 40 parts by weight and used, and polytetrafluoroethylene particles were not used.
- Comparative Example 2 In Example 1, the amount of polymethylsilsesquioxane particles was changed to 45 parts by weight, and the amount of polytetrafluoroethylene particles was changed to 5 parts by weight.
- Example 3 Comparative Example 3 In Example 1, the amount of polymethylsilsesquioxane particles was changed to 10 parts by weight, and the amount of polytetrafluoroethylene particles was changed to 55 parts by weight.
- Example 5 Comparative Example 5 In Example 1, the amount of polymethylsilsesquioxane particles was changed to 50 parts by weight, and the amount of polytetrafluoroethylene particles was changed to 50 parts by weight.
- Comparative Example 7 In Example 1, the same amount (20 parts by weight) of paraffin wax having a melting point of 35 ° C. was used.
- Comparative Example 8 In Example 1, the same amount (20 parts by weight) of paraffin wax having a melting point of 170 ° C. was used.
- Example 11 Comparative Example 11 In Example 1, 30 parts by weight of AGC Seichemical product Fluon 150J (particle diameter 10 ⁇ m) was used as the polytetrafluoroethylene particles, and paraffin wax was not used.
- Table 1 Example Measurement / evaluation items 1 2 3 4 Dispersibility of fluororesin particles ⁇ ⁇ ⁇ ⁇ Contact angle (°) 21.3 10.8 19.4 20.8 ⁇ ⁇ ⁇ ⁇ Dynamic friction coefficient in oil 0.18 0.15 0.18 0.19 ⁇ ⁇ ⁇ ⁇ Abrasion resistance ⁇ ⁇ ⁇ ⁇
- the coating agent obtained in each example achieves low torque while maintaining good wear resistance.
- the coating agent according to the present invention maintains the excellent sealing performance inherent in the oil seal, improves wear resistance, and achieves low torque. Therefore, not only the oil seal but also the rubber roll for a copying machine It is also effectively used for preventing adhesion, reducing friction, and preventing wear of rubber parts such as rubber belts for copiers, industrial rubber hoses, industrial rubber belts, wipers, automobile weather strips, and glass runs.
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Abstract
Description
イソシアネート基含有1,2-ポリブタジエン 200重量部
(日本曹達製品TP1001;酢酸ブチル50重量%含有) ( 100 〃 )
ポリメチルシルセスキオキサン粒子 30 〃
(モメンティブ社製品トスパール130;粒子径3μm)
ポリテトラフルオロエチレン粒子 30 〃
(AGCセイケミカル製品フルオン172J;粒子径0.2μm)
パラフィンワックス(融点100℃) 20 〃
酢酸ブチル (残部) 〃
合 計 2000 〃
にて確認し、10分後において沈降がみられないものを○、10分
未満の間に沈降がみられたものを×と評価
接触角:協和界面科学製Drop Master 500を用い、エンジンオイルOW-20
に対する接触角を計測し、35°未満を○、35°以上を×と評価
油中での動摩擦係数:新東科学製HEIDON TYPE14DR表面性試験機を用い
、下記条件下で往復動を行い、往路側の動摩擦係
数を測定し、0.2未満を○、0.2以上を×と評価
荷重:50g
速度:50mm/分
往復動距離:50mm
圧子:10mm径鋼球
油種:エンジンオイルOW-20
注) 油中での動摩擦係数は、オイルシールの実機評価と
相関している評価であり、上記テストピースを用い
た油中での動摩擦係数が低いとオイルシールを用い
た実機評価も良好になる
耐摩耗性:レスカ社製フリクションプレーヤーFPR-2000を用い、コーテ
ィング被膜表面に直径0.4mmのSUSピンをドライ状態で80℃、
荷重300gで押し当て、線速度400mm/秒の速さで回転させ、
コーティング被膜が剥がれ、ゴムが露出する迄の距離を測定
し、0.1km以上を○、0.1km未満を×と評価
実施例1において、ポリメチルシルセスキオキサン粒子の代わりに、非晶質二酸化ケイ素粒子(中央シリカ製品シリカ6B;粒子径7μm)が同量(30重量部)用いられた。
実施例1において、ポリメチルシルセスキオキサン粒子量が56重量部に、またポリテトラフルオロエチレン粒子量が24重量部に、それぞれ変更されて用いられた。
実施例1において、ポリメチルシルセスキオキサン粒子量が24重量部に、またポリテトラフルオロエチレン粒子量が56重量部に、それぞれ変更されて用いられた。
実施例1において、ポリメチルシルセスキオキサン粒子量が40重量部に変更されて用いられ、ポリテトラフルオロエチレン粒子は用いられなかった。
実施例1において、ポリメチルシルセスキオキサン粒子量が45重量部に、またポリテトラフルオロエチレン粒子量が5重量部に、それぞれ変更されて用いられた。
実施例1において、ポリメチルシルセスキオキサン粒子量が10重量部に、またポリテトラフルオロエチレン粒子量が55重量部に、それぞれ変更されて用いられた。
実施例1において、ポリメチルシルセスキオキサン粒子が用いられず、ポリテトラフルオロエチレン粒子量が40重量部に変更されて用いられた。
実施例1において、ポリメチルシルセスキオキサン粒子量が50重量部に、またポリテトラフルオロエチレン粒子量が50重量部に、それぞれ変更されて用いられた。
実施例1において、ポリメチルシルセスキオキサン粒子およびポリテトラフルオロエチレン粒子が用いられなかった。
実施例1において、パラフィンワックスとして融点が35℃のものが同量(20重量部)用いられた。
実施例1において、パラフィンワックスとして融点が170℃のものが同量(20重量部)用いられた。
実施例1において、パラフィンワックス量が5重量部に変更されて用いられた。
実施例1において、パラフィンワックス量が60重量部に変更されて用いられた。
実施例1において、ポリテトラフルオロエチレン粒子としてAGCセイケミカル製品フルオン150J(粒子径10μm)が30重量部用いられ、パラフィンワックスが用いられなかった。
表1
実施例
測定・評価項目 1 2 3 4
フッ素樹脂粒子の分散性 ○ ○ ○ ○
接触角 (°) 21.3 10.8 19.4 20.8
○ ○ ○ ○
油中での動摩擦係数 0.18 0.15 0.18 0.19
○ ○ ○ ○
耐摩耗性 ○ ○ ○ ○
(1) 各実施例で得られたコーティング剤は、良好な耐摩耗性を保持しつつ、低トルク性をも達成している。
(2) フッ素樹脂粒子が十分な量用いられないと、耐摩耗性が悪化してしまう(比較例1~2)。
(3) フッ素樹脂粒子の割合が多いと、油をはじくようになってしまい、接触角および油中での摩擦係数が大きくなってしまう(比較例3~4)。
(4) 全充填剤量が多いと、コーティング膜の表面粗さが大きくなり凸部の油切れが生じ、また全充填剤量が少ないと、表面粗さが小さくなり、何れの場合も耐摩擦・摩耗効果が低下してしまう(比較例5~6)。
(5) ワックスの融点が低すぎると、焼付け時にワックスが抜けてしまい、耐摩耗性が悪化してしまう (比較例7)。
(6) ワックスの融点が高すぎると、焼付け時にワックスが融解せず、油中での摩擦係数が大きくなってしまう(比較例8)。
(7) ワックス量が少ないとフッ素樹脂粒子の分散性が担保されず、表面粗さが大きくなりすぎてしまう(比較例9)。
(8) ワックス量が多いと、コーティング膜の軟化が起こり、耐摩擦・摩耗特性が悪化してしまう(比較例10)。
Claims (9)
- イソシアネート基含有1,2-ポリブタジエン100重量部に対し、粒子径が2μm以下であるフッ素樹脂粒子と粒子径が0.5~30μmであるフッ素樹脂粒子以外の充填剤粒子とを合計で10~90重量部および融点40~160℃であるワックスを10~40重量部の割合で含有させた有機溶媒溶液として調製され、フッ素樹脂粒子を全充填剤量の20~80重量%の割合で用いたオイルシール用コーティング剤。
- 粒子径が0.5μm以下のフッ素樹脂粒子が用いられた請求項1記載のオイルシール用コーティング剤。
- 粒子径が1~20μmであるフッ素樹脂粒子以外の充填剤粒子が用いられた請求項1記載のオイルシール用コーティング剤。
- 全充填剤量が40~80重量部の割合で用いられる請求項1記載のオイルシール用コーティング剤。
- フッ素樹脂が全充填剤量の30~70重量%の割合で用いられた請求項1記載のオイルシール用コーティング剤。
- ワックスが10~30重量部の割合で用いられた請求項1記載のオイルシール用コーティング剤。
- 請求項1記載のコーティング剤を用いてコーティング処理されたオイルシール。
- コーティング処理後、150~250℃で10分間~24時間加熱処理された請求項7記載のオイルシール。
- オイルシール表面とエンジンオイルとの接触角が35°未満である請求項7または8記載のオイルシール。
Priority Applications (6)
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US17/629,529 US20220251419A1 (en) | 2019-07-25 | 2020-06-30 | Coating agent for oil seal |
MX2022001050A MX2022001050A (es) | 2019-07-25 | 2020-06-30 | Agente de recubrimiento para sello de aceite. |
JP2021533892A JP7273968B2 (ja) | 2019-07-25 | 2020-06-30 | オイルシール用コーティング剤 |
CN202080053226.1A CN114174442A (zh) | 2019-07-25 | 2020-06-30 | 油封用涂布剂 |
KR1020227004683A KR20220032605A (ko) | 2019-07-25 | 2020-06-30 | 오일씨일용 코팅제 |
EP20845046.0A EP4006114A4 (en) | 2019-07-25 | 2020-06-30 | COATING AGENT FOR OIL SEAL |
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WO2023008405A1 (ja) * | 2021-07-28 | 2023-02-02 | アクロス株式会社 | 摺動部材用被膜組成物及び摺動部材 |
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- 2020-06-30 KR KR1020227004683A patent/KR20220032605A/ko not_active Application Discontinuation
- 2020-06-30 US US17/629,529 patent/US20220251419A1/en active Pending
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