WO2019223978A1 - Matériau de caoutchouc epdm amélioré et son procédé de production - Google Patents

Matériau de caoutchouc epdm amélioré et son procédé de production Download PDF

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Publication number
WO2019223978A1
WO2019223978A1 PCT/EP2019/061233 EP2019061233W WO2019223978A1 WO 2019223978 A1 WO2019223978 A1 WO 2019223978A1 EP 2019061233 W EP2019061233 W EP 2019061233W WO 2019223978 A1 WO2019223978 A1 WO 2019223978A1
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WO
WIPO (PCT)
Prior art keywords
rubber
rubber material
epdm rubber
improved
mixture
Prior art date
Application number
PCT/EP2019/061233
Other languages
English (en)
Inventor
Ceren ONEY
Burak YURT
Original Assignee
Arcelik Anonim Sirketi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Publication of WO2019223978A1 publication Critical patent/WO2019223978A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C08K5/0025—Crosslinking or vulcanising agents; including accelerators

Definitions

  • the present invention relates to EPDM rubber material whose frictional properties and abrasion resistance are improved in order to be used in washing machines.
  • Rubber friction is considered as a very significant issue for materials such as tires, conveyor belts and gaskets. Friction of rubber material differs from the frictional properties of most other solids. The reason for this is the very low elastic modulus of rubber and the high internal friction exhibited by rubber in a wide frequency region. It is noted that rubber friction is directly related to the internal friction of the rubber. Reinforcing fillers are incorporated into rubber matrix in order to inhibit abrasion and rupture arising from rubber/rubber friction.
  • Abrasion resistance is also taken into consideration in selecting the additives to be introduced to a rubber matrix in order to reduce the friction coefficient of the rubber material. Correct additives should be selected to establish correct applications.
  • Frictional force can be defined as the resistance exhibited by surfaces in contact with each other in order to hinder each other's movement.
  • friction coefficient is known as a dimensionless value. Friction coefficient may vary according to the materials used. Frictional force displayed against movement is directly proportional to normal force.
  • Rubber friction acts unlike known plastic and metallic materials. The main underlying reason is the viscoelasticity of rubbers. Rubber friction should be expressed as a combination of three separate effects instead of a single principle. These are adhesion, deformation and abrasion . Rubber friction can be addressed by means of these three separate effect systems. Adhesion effect is, not allowing a surface to depart after contacting thereof, as seen in adhesive tapes. In general, adhesion is described as "the attachment between the molecules of two interacting surfaces.” If the strength of said attachment is equal on all points, then the surfaces resist against sliding on each other. If these two contacting surfaces are completely smooth, than the visible contact and actualized contact might be expected to be identical. However, this statement is incorrect particularly for rubbers.
  • Deformation begins to show its effects when a rubber surface contacts another surface containing burrs like itself.
  • a rugged surface slides on a rubber surface
  • said burrs cause an energy dissipation at their meeting points. This is caused by the elastic nature of rubber.
  • the rubber has to slide with a different velocity (V) to create the energy required to slide said burr thereon.
  • V velocity
  • a wet rubber surface would move the burrs away from each other due to the dampness in between, thereby averting said deformation forces.
  • tensile forces also create friction by causing abrasion and rupture.
  • deformation forces and sliding velocity are increased, the tensile forces on local regions reach the tensile resistance of rubber. This primarily begins in regions with sharper burrs.
  • High local tensile forces exceed the elastic recovery point by deforming the inner structure of rubber.
  • polymer bonds and rubber cross-links are stretched to deformation, the material can no longer resume its initial state, leading to its rupture. During rupture, excess energy is absorbed, forming an additional friction force between sliding surfaces.
  • Abrasion forms as a result of rupture. After local tensions exceed the point required to start rupture or when the material is subjected to high tension for a long duration, this rupture results with tearing of a piece of the material.
  • EPDM based rubbers are widely used in domestic appliances, particularly in dishwashers and washing machines in which sealing is of utmost importance. EPDM rubber material is also used in bellows enabling sealing in front doors of washing machines. Therefore, in order to inhibit the vibration generated during operation of the machine from causing rubber/rubber interface friction in the structure, surface friction coefficient of the elastomeric composite material formulization should be decreased. Useful lifetime of the product would be extended by preventing abrasion induced damages on the structure. Decreasing surface friction coefficient of rubber materials aims to reduce the structural damages caused by rubber/rubber friction. In turn, reducing damages would decrease maintenance and break down ratios.
  • the rubber composition's first material consists of at least one of the group including tetrafluoroethylene-ethylene copolymer, tetrafluouroethylene-perfluoroalkyl vinyl ether copolymer and tetrafluoroethylene-hexafluoropropylene copolymer
  • the second material consists of thermoset fluoro rubber
  • the third material consists of tetrafluoroethylene polymer material displayed by the formula (-CF2-CF2-). Fluoro rubber is used in the invention.
  • thermoplastic composition consisting of graphite, mica and carbon fiber. These additives are employed to decrease friction coefficient.
  • polyimide material can be introduced as additive.
  • the friction coefficient of the thermoplastic composition is less than or equal to 0.20.
  • the thermoplastic composition with additives comprises 1-20% of graphite; 4-30% of a carbon fiber; and 1-20% of mica. Thermoplastic material is used in the invention.
  • composition and production method of a self-lubricating gasket having high wear resistance contains 60-80 parts of fluoro rubber, 20-40 parts of polytetrafluoroethylene, 1.5-2.5 parts of p-phenylenediamine, 1.5-2.5 parts of dihyaroquinoline, 5-10 parts of plasticizing agent, 35-48 parts of strengthening agent, 2-6 parts of slipping agent, 2-4 parts of dispersion agent, 1.5-2.5 parts of vulcanizing agent, 5-8 parts of activating agent, 1-2 parts of stearic acid and 1.6-2.0 parts of accelerating agent.
  • Fluoro rubber is used in the invention and ptfe material is employed as lubricating agent.
  • German patent application no. DE102006038023 mentions application of polyester formed by reaction of carboxylic acid, in order to decrease friction coefficient of rubber and elastic surfaces.
  • Surface friction decreasing agents are prepared in the invention.
  • Polyester material is used in the invention.
  • CN102604178 mentions developing a lubricant material composition. It is noted that friction is low when surfaces move and that the material exhibits excellent abrasion resistance.
  • the composition contains binding resin, 5-25% (percentage by volume) of N-monoalkyl basic amino acid, 5-25% (percentage by volume) of molybdenum disulphide and polytetrafluoroethylene in the range of 5-20%.
  • Thermoplastic molybdenum disulphide and ptfe material are used in the invention.
  • JP3526045 mentions a shock-proof rubber composition in which butadiene rubber is used. It is noted that fatty acid amide, e.g. oleamide can be used in the proportion of 10-50 phr. The composition is developed to improve vibrational properties of rubbers. In the invention, butadiene is used with the purpose of improving vibrational properties of rubber material.
  • thermoplastic elastomer composition with improved frictional properties, which can be utilized in gaskets.
  • This composition contains 64-96.3% of branched thermoplastic elastomer, 0.05-1% of amide based slip agent, 0.5-1% of silicon based oil, 3-28% of hydroxicarboxylate, 1-5% of diisocyanate and 0.05-1% of carbodiimide.
  • amid based agents are one selected from the group comprising erucamide, oleamide, stearamide, behenamide or the mixture of two or more, and that the viscosity thereof is 10,000-500,000 cs.
  • Thermoplastic elastomer is used in the invention.
  • the aim of the invention is to reduce friction induced abrasions of EPDM rubber material used in washing machine bellows, dishwasher door gaskets or spray arm gaskets, and to thereby decrease maintenance ratios.
  • the improved EPDM rubber material of the invention is suitable to be used for preventing friction induced problems in rubber parts of washing machines and dishwashers, and is formed by adding a mixture consisting of graphite, oleamide and fatty acid based lubricants in a proportion of 0.97-3.94% (preferably 0.97%) into an EPDM rubber material mixture comprising inorganic or organic fillers (15-20%), process oils (10-15%), curing agents (0.05-0.3%) and accelerators (1-3%).
  • Production method of the improved EPDM rubber material of the invention comprises the steps of:
  • the improved EPDM rubber material of the invention is an application developed to eliminate friction based problems of rubber materials used as hose, gasket and bellows raw material in dishwashers and washing machines. Adding a mixture consisting of graphite, oleamide and fatty acid based lubricants in an EPDM based formulation used in dishwasher and washing machine hoses, gaskets and bellows, during the production of EPDM rubber material, enables decreasing friction coefficient, increasing abrasion resistance and averting friction induced sounds.
  • EPDM rubber which is a synthetic type of rubber, is used in the rubber formulation in the scope of the invention.
  • Homogeneous distribution of all subcomponents in a certain proportion inorganic or organic fillers (15-20%), process oils (10-15%), curing agents (0.05-0.3%), accelerators (1-3%)), consisting a washing machine bellows material in the rubber formulation is enabled by open mill and bandbury mixer (internal mixer).
  • a mixing duration is selected which is long enough to ensure homogeneity of the mixture. Introduction sequence and duration of the added materials is of utmost importance in terms of paste properties.
  • the composition comprising oleamide, graphite and fatty acid based lubricant material can be added to the mixture in a proportion in the range of 0.97-3.94% (preferably 0.97%), during mixing with bandbury mixer.
  • EPDM based rubber pastes are used also in parts such as dishwasher door gaskets or spray arm gaskets, in order to reduce friction induced abrasions and to thereby decrease maintenance ratios.
  • parts such as dishwasher door gaskets or spray arm gaskets
  • friction coefficient will be reduced and damage ratios can be decreased.
  • Table 1 displays the results of friction coefficient measurements conducted by using the BS ISO 15113:2005 ''Rubber-Determination of frictional properties'' standard.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

La présente invention concerne un matériau de caoutchouc EPDM dont les propriétés de frottement et la résistance à l'abrasion sont améliorées pour une utilisation dans des machines à laver. Le but de l'invention est de réduire les abrasions induites par frottement d'un matériau de caoutchouc EPDM utilisé dans des soufflets de machine à laver, des joints de porte de lave-vaisselle ou des joints de bras de pulvérisation, et de réduire ainsi les taux de maintenance.
PCT/EP2019/061233 2018-05-21 2019-05-02 Matériau de caoutchouc epdm amélioré et son procédé de production WO2019223978A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201807148 2018-05-21
TRA2018/07148 2018-05-21

Publications (1)

Publication Number Publication Date
WO2019223978A1 true WO2019223978A1 (fr) 2019-11-28

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113292794A (zh) * 2020-02-21 2021-08-24 安波福电气系统有限公司 自润滑环保型epdm材料

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JPS526045B1 (fr) 1971-06-04 1977-02-18
US4978463A (en) 1988-02-02 1990-12-18 Ntn-Rulon Industries, Co., Ltd. Lubricating rubber composition
US20040158005A1 (en) 2002-12-18 2004-08-12 Bloom Joy Sawyer Low coefficient of friction thermoplastic containing filler
US7021633B2 (en) 2001-09-11 2006-04-04 Gorman Company, Inc. Low friction fluid seal device with additive to rubber compound
DE102006038023A1 (de) 2006-08-14 2008-02-21 Schill + Seilacher "Struktol" Ag Verfahren zur Verminderung der Oberflächenreibung und -klebrigkeit von Kautschuk und Gummi
KR20080041135A (ko) * 2006-11-06 2008-05-09 동명통산(주) 자기 윤활성 고무조성물
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US7485060B2 (en) 2003-05-30 2009-02-03 Mitsuboshi Belting Ltd. Rubber composition and power transmission belt incorporating the rubber composition
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CN102604178A (zh) 2011-11-29 2012-07-25 上海大学 采用二硫化钼固体润滑剂耐磨改性的hnbr、nbr、nbr/pvc动密封材料及其制备方法
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CN105860284A (zh) * 2016-04-27 2016-08-17 安徽中鼎橡塑制品有限公司 一种汽车转向防尘罩用热塑性硫化橡胶材料及其制备方法
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS526045B1 (fr) 1971-06-04 1977-02-18
US4978463A (en) 1988-02-02 1990-12-18 Ntn-Rulon Industries, Co., Ltd. Lubricating rubber composition
US7021633B2 (en) 2001-09-11 2006-04-04 Gorman Company, Inc. Low friction fluid seal device with additive to rubber compound
US20040158005A1 (en) 2002-12-18 2004-08-12 Bloom Joy Sawyer Low coefficient of friction thermoplastic containing filler
US7485060B2 (en) 2003-05-30 2009-02-03 Mitsuboshi Belting Ltd. Rubber composition and power transmission belt incorporating the rubber composition
DE102006038023A1 (de) 2006-08-14 2008-02-21 Schill + Seilacher "Struktol" Ag Verfahren zur Verminderung der Oberflächenreibung und -klebrigkeit von Kautschuk und Gummi
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CN104178330A (zh) 2014-07-31 2014-12-03 青岛华承天机械制造有限公司 一种低成本复合固体润滑材料
CN105860284A (zh) * 2016-04-27 2016-08-17 安徽中鼎橡塑制品有限公司 一种汽车转向防尘罩用热塑性硫化橡胶材料及其制备方法
CN107474400A (zh) * 2017-07-31 2017-12-15 威固技术（安徽）有限公司 一种改善汽车nvh性能自润滑橡胶吊耳及其制备方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113292794A (zh) * 2020-02-21 2021-08-24 安波福电气系统有限公司 自润滑环保型epdm材料

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