WO2007116257A2 - Structural engineering sliding elements having high wear-proof and low coefficient of friction - Google Patents

Structural engineering sliding elements having high wear-proof and low coefficient of friction Download PDF

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Publication number
WO2007116257A2
WO2007116257A2 PCT/IB2007/000651 IB2007000651W WO2007116257A2 WO 2007116257 A2 WO2007116257 A2 WO 2007116257A2 IB 2007000651 W IB2007000651 W IB 2007000651W WO 2007116257 A2 WO2007116257 A2 WO 2007116257A2
Authority
WO
WIPO (PCT)
Prior art keywords
wear resistant
sliding element
molecular weight
highly wear
uhmwpe
Prior art date
Application number
PCT/IB2007/000651
Other languages
French (fr)
Other versions
WO2007116257A3 (en
Inventor
Virginio Quaglini
Carlo Poggi
Agotino Marioni
Charlotte Tavecchio
Roberto Chiesa
Original Assignee
Politecnico Di Milano
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 Politecnico Di Milano filed Critical Politecnico Di Milano
Priority to CN2007800131383A priority Critical patent/CN101421462B/en
Priority to EP07713128A priority patent/EP2004913A2/en
Publication of WO2007116257A2 publication Critical patent/WO2007116257A2/en
Publication of WO2007116257A3 publication Critical patent/WO2007116257A3/en

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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
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F110/00—Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F110/02—Ethene
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/04—Bearings; Hinges
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
    • C08F2500/01—High molecular weight, e.g. >800,000 Da.

Definitions

  • ultra high molecular weight polyethylene comprises mixtures of fluoropolymers to provide a further reduction of the coefficients of friction in the sliding surface of the sliding element.
  • These mixtures of fluoropolymers preferably have a 60% fluorine content by weight.

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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)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Sliding-Contact Bearings (AREA)
  • Laminated Bodies (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Lubricants (AREA)

Abstract

A highly wear resistant sliding element for use in structural engineering comprises at least one sliding surface made from ultra high molecular weight polyethylene (UHMWPE). Advantageously, the molecular weight of such ultra high molecular 5 weight polyethylene (UHMWPE) is higher than 6.5x10 6 g/mol.

Description

STRUCTURAL ENGINEERING SLIDING ELEMENTS HAVING HIGH WEAR-PROOF AND LOW COEFFICIENT OF FRICTION
DESCRIPTION
The present invention addresses a sliding element having high wear resistance and low coefficient of friction for use in structural engineering, according to the preamble of claim 1.
Particularly, the invention relates to a highly wear resistant sliding element for use in the building industry as a friction sliding element in civil works, such as bridge bearings, seismic energy dissipators and joints.
For simplicity, the present description is given without limitation with particular reference to bridge bearings, for instance subjected to heavy load conditions, such as bridges for high speed railway line sections or bridges subjected to particularly intense traffic conditions.
Civil structures of the above mentioned type are known to be designed and constructed in such a manner as to allow limited relative movements between structure parts. This allows the structure to adapt to different seismic or other load stresses, and to limit the maximum stress value within the structure. Such movements generally include sliding or pivotal movements between two or more structure parts, sliding or hinged connections being provided in the structure to allow such movements.
These connections generally comprise a pair of flat or curved surfaces susceptible of sliding/pivoting relative to each other to allow such relative displacements and/or pivotal movements to occur. To minimize both static and dynamic friction between the parts, a first surface of such pair of surfaces is made of steel, such as an austenitic steel, and the other surface is conveniently made from an engineering polymer, a lubricant such as a silicone fat being possibly used between the sliding surfaces.
The requirement to be met is that at least one of the contact surfaces is made from a material that: has a low coefficient of static and dynamic friction, to facilitate slipping, sliding and/or rotation between the parts, while meeting the peculiar technical requirements for this specific use. In this respect, the engineering polymer shall also have at least a high or long-lasting resistance to compressive loads and wear in a temperature range from -2O0C to +4O0C.
In accordance with currently applicable standards, such as the European Standard EN 1337/2, "Sliding elements", the material that is commonly used in prior art for sliding elements is PTFE (polytetrafluoroethylene).
Now, the need is strongly felt for an engineering polymer having better properties than PTFE for this specific application. Amongst various materials, ultra high molecular weight polyethylene (UHMWPE) has been proposed, having a molecular weight of 3 x xlO6 g/mol e 6xlO6 g/mol. Such materials provide better results than PTFE but cannot meet particularly stringent requirements yet.
The invention is based on the issue of conceiving a highly wear resistant sliding element for use in structural engineering that has such structural and functional features as to meet the above requirements, while considerably improving the performance of the sliding element in the various conditions of use as compared with prior art sliding elements, especially in particularly heavy conditions.
This issue is addressed by a highly wear resistant sliding element for use in structural engineering according to the features of claim 1.
Further features and advantages of the highly wear resistant sliding element for use in structural engineering of the present invention will be apparent upon reading the following description of a few preferred embodiments thereof, which is given by way of illustration and without limitation.
According to the invention the highly wear resistant sliding element for use in structural engineering comprises at least one sliding surface made from ultra high molecular weight polyethylene (UHMWPE). Advantageously, the molecular weight of such ultra high molecular weight polyethylene (UHMWPE) is at least 6.5x106 g/mol, as an average detectable value.
The molecular weight of such ultra high molecular weight polyethylene (UHMWPE) is preferably higher than 8 x 106 g/mol, at least 9 x 106 g/mol and, more preferably from 9.I x IO6 g/mol to 9.6 x 106 g/mol.
In order to improve the structural or behavior properties of the ultra high molecular weight polyethylene (UHMWEPE), a few additives to be incorporated in such high molecular weight polyethylene and particular treatments for such polyethylene will be mentioned below.
Advantageously, the above mentioned ultra high molecular weight polyethylene (UHMWPE) comprises aluminum powder or aluminum compounds to further improve the wear resistance of the sliding surface of the sliding element.
Advantageously, such ultra high molecular weight polyethylene (UHMWPE) comprises additives for increasing the creep resistance of the sliding surface of the sliding element. These additives preferably include talc and/or calcium stearate.
Advantageously, the ultra high molecular weight polyethylene (UHMWPE) comprises antioxidants for increasing the oxidation resistance of the sliding surface of the sliding element.
Advantageously, such ultra high molecular weight polyethylene (UHMWPE) comprises heat stabilizers for preserving mechanical properties such as toughness and strength of the sliding surface of the sliding element under high temperatures.
Advantageously, the above mentioned ultra high molecular weight polyethylene (UHMWPE) comprises mixtures of fluoropolymers to provide a further reduction of the coefficients of friction in the sliding surface of the sliding element. These mixtures of fluoropolymers preferably have a 60% fluorine content by weight.
Advantageously, the ultra high molecular weight polyethylene (UHMWPE) may be crosslinked through gamma or beta radiation at high radiation doses, above 40 kGy and below 1000 kGy, possibly followed by a stabilization treatment for reactive free radical scavenging, which is a thermal treatment preferably conducted at a temperature above the melting point.
Advantageously, the ultra high molecular weight polyethylene (UHMWPE) may be crosslinked through addition of crosslinking agents and free-radical initiators, such as peroxides, followed by a stabilization treatment for scavenging reactive free radicals and reducing the likelihood of oxidation, which is effected by a thermal treatment preferably conducted at a temperature above the melting point.
Particularly, crosslinking induced by radiation or free-radical initiators increases the molecular weight of polyethylene by forming intermolecular bonds, which can modify the physico-chemical and mechanical properties of the polymer. Such crosslinking particularly causes an increase in wear resistance and mechanical stability of the material (creep reduction).
Chemical crosslinking is more effective in limiting the loss of toughness and elongation at break that can occur in certain cases after radiation crosslinking.
In case of radiation crosslinking, stabilizers and/or antioxidants are advantageously incorporated in the polymer during compounding before radiation, to scavenge the free radicals produced by gamma radiation treatment. After the above mentioned radiation crosslinking treatment, the sliding element is advantageously subjected to a heat treatment adapted to reduce or eliminate free radicals from the crosslinked polyethylene, to provide oxidation resistance and preserve mechanical properties with time.
Particularly, the semifinished or finished sliding element may be conveniently held in an oven for more than one hour and at such a temperature as to cause the polyethylene structure to soften, e.g. a temperature from 135°C to 1500C By this arrangement, the free radicals will be almost fully scavenged, although certain mechanical properties, such as toughness and elongation at break will be affected.
However, the semifinished or finished sliding element may be conveniently held in an oven for more than one hour and at a temperature below the softening point of the polyethylene, e.g. a temperature from HO0C to 1350C. This will reduce degradation of the above mentioned mechanical properties (toughness and elongation at break), while dramatically decreasing the free radical content therein.
As a mere example, a ultra high molecular weight polyethylene (UHMWPE) suitable for this specific application among those commercially available is the one sold by Rochling under the trade name Polystone® X-Slide M, which has the following properties:
- A UHMWPE having a molecular weight of 9.2 x 106 g/mol; added with fluoropolymers to improve its sliding behavior and reduce friction; added with antioxidants to increase stability and inertness to oxygen.
In addition, the properties of Polystone® X-Slide M polyethylene are improved by the crosslinking process and following thermal treatment as described above.
Experimental tests showed that a ultra high molecular weight polyethylene (UHMWPE) having a molecular weight of at least 6.5 x 106 g/mol causes, over the sliding surface of the sliding element, a considerable increase of:
- sliding wear resistance, which affords higher sliding speeds, and
- mechanical strength and toughness at high temperatures.
As disclosed above, if a particularly high wear resistance is desired, the base material may be filled with aluminum microspheres and powder or aluminum compounds.
For further improvement of the outstanding sliding and wear resistance properties of the UHMWPE material, the sliding element may be initially lubricated with a silicone lubricant and the sliding surface of the sliding element may have a plurality of surface cells for containing and holding lubricants even under mutual sliding of the surfaces.
The sliding elements may be provided in any conformation, such as skids, caps, belts and guides.
In the highly wear resistant sliding element of the invention, the sliding surface made from ultra high molecular weight polyethylene (UHMWPE):
- has an ultimate compressive strength up to 190 MPa;
- allows a sliding length of at least 5 x 104 m when lubricant is contained in the above mentioned surface cells;
- withstands a sliding speed of 15 mm/s when lubricant is contained in the above mentioned surface cells;
- has lower coefficients of friction as compared with PTFE;
- has a high or long-lasting resistance to compressive loads and wear in a temperature range from -50°C to +6O0C;
- has a substantially constant thermal expansion coefficient, involving an increased dimensional stability, as temperature changes.
It will be appreciated from the above that the highly wear resistant sliding element for use in structural engineering according to the present invention meets the above requirements, while considerably improving the performance of the sliding element in the various conditions of use as compared with prior art sliding elements.
Those skilled in the art will obviously appreciate that a number of changes and variants may be made to the highly wear resistant sliding element for use in structural engineering as described hereinbefore, without departure from the scope of the invention, as defined in the following claims.

Claims

1. A highly wear resistant sliding element for use in structural engineering comprising at least one sliding surface made from ultra high molecular weight polyethylene (UHMWPE), characterized in that the molecular weight of said ultra high molecular weight polyethylene (UHMWPE) is at least 6.5 x 106 g/mol.
2. A highly wear resistant sliding element as claimed in claim I5 wherein the molecular weight of said ultra high molecular weight polyethylene (UHMWPE) is above 8 x 106 g/mol.
3. A highly wear resistant sliding element as claimed in claim 2, wherein the molecular weight of said ultra high molecular weight polyethylene (UHMWPE) is at least 9 x lO6 g/mol.
4. A highly wear resistant sliding element as claimed in claim 3, wherein the molecular weight of said ultra high molecular weight polyethylene (UHMWPE) is from 9.I x IO6 g/mol to 9.6 x 106 g/mol.
5. A highly wear resistant sliding element as claimed in anyone of claims 1 to 4, wherein said ultra high molecular weight polyethylene (UHMWPE) comprises aluminum powder or aluminum compounds.
6. A highly wear resistant sliding element as claimed in anyone of claims 1 to 5, wherein said ultra high molecular weight polyethylene (UHMWPE) comprises additives for increasing the creep resistance of said sliding surface.
7. A highly wear resistant sliding element as claimed in claim 6, wherein said additives for increasing creep resistance include talc.
8. A highly wear resistant sliding element as claimed in claim 6 or 7, wherein said additives for increasing creep resistance include calcium stearate.
9. A highly wear resistant sliding element as claimed in anyone of claims 1 to 8, wherein said ultra high molecular weight polyethylene (UHMWPE) comprises antioxidants for increasing the oxidation resistance of the sliding surface of the sliding element.
10. A highly wear resistant sliding element as claimed in anyone of claims 1 to 9, wherein said ultra high molecular weight polyethylene (UHMWPE) comprises heat stabilizers for preserving mechanical properties such as toughness and strength of said sliding surface under high temperatures.
11. A highly wear resistant sliding element as claimed in anyone of claims 1 to 4, wherein said ultra high molecular weight polyethylene (UHMWPE) comprises mixtures of fluoropolymers to provide a further reduction of the coefficient of static and dynamic friction in said sliding surface.
12. A highly wear resistant sliding element as claimed in claim 11, wherein said fluoropolymers of said mixtures have a 60% fluorine content by weight.
13. A highly wear resistant sliding element as claimed in anyone of claims 1 to 12, wherein said ultra high molecular weight polyethylene (UHMWPE) is crosslinked.
14. A highly wear resistant sliding element as claimed in claim 13, wherein said ultra high molecular weight polyethylene (UHMWPE) is crosslinked through gamma or beta radiation with doses from 40 kGy to 1000 kGy.
15. A highly wear resistant sliding element as claimed in claim 13, wherein said ultra high molecular weight polyethylene (UHMWPE) is crosslinked by means of peroxides.
16. A highly wear resistant sliding element as claimed in any one of claims 13 to 15, wherein said polyethylene undergoes a heat treatment for more than one hour at such a temperature as to cause the polyethylene structure to soften for free radical scavenging.
17. A highly wear resistant sliding element as claimed in claim 16, wherein said temperature is in a range of 1350C to 1500C.
18. A highly wear resistant sliding element as claimed in any one of claims 13 to 15, wherein said polyethylene undergoes a heat treatment at a temperature below the softening point of the polyethylene structure, for reduction of the free radical content.
19. A highly wear resistant sliding element as claimed in claim 18, wherein said temperature is in a range of 1100C to 135°C.
20. A highly wear resistant sliding element as claimed in anyone of claims 1 to 19, wherein said ultra high molecular weight polyethylene (UHMWPE) has a compressive strength of at least 190 MPa.
21. A highly wear resistant sliding element as claimed in anyone of claims 1 to 20, wherein said sliding surface allows a sliding length of at least 5 x 104 m.
22. A highly wear resistant sliding element as claimed in anyone of claims 1 to 21, wherein said sliding surface withstands a sliding speed of 15 mm/s.
23. A highly wear resistant sliding element as claimed in any one of claims 1 to 22, wherein said sliding surface has a plurality of lubricant containing surface cells.
PCT/IB2007/000651 2006-04-12 2007-03-12 Structural engineering sliding elements having high wear-proof and low coefficient of friction WO2007116257A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2007800131383A CN101421462B (en) 2006-04-12 2007-03-12 Structural engineering sliding elements having high wear-proof and low coefficient of friction
EP07713128A EP2004913A2 (en) 2006-04-12 2007-03-12 Structural engineering sliding elements having high wear-proof and low coefficient of friction

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000735A ITMI20060735A1 (en) 2006-04-12 2006-04-12 ELEMENTS OF SLIDING WITH HIGH RESISTANCE TO WEAR AND LOW FRICTION COEFFICIENT FOR STRUCTURAL ENGINEERING
ITMI2006A000735 2006-04-12

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WO2007116257A2 true WO2007116257A2 (en) 2007-10-18
WO2007116257A3 WO2007116257A3 (en) 2007-12-21

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EP (1) EP2004913A2 (en)
KR (1) KR20090009859A (en)
CN (1) CN101421462B (en)
IT (1) ITMI20060735A1 (en)
WO (1) WO2007116257A2 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8011142B2 (en) * 2007-02-06 2011-09-06 Alga S.P.A. Sliding pendulum seismic isolator
KR101378411B1 (en) * 2011-06-02 2014-03-28 한국수력원자력 주식회사 Manufacturing of wear resistance reinforced engineering plastics using the radiation method and plastics using thereof
CN104863046A (en) * 2015-05-04 2015-08-26 株洲时代新材料科技股份有限公司 Rubber support containing ultrahigh wear-resistance plate and manufacturing method thereof
CN105602064A (en) * 2016-02-01 2016-05-25 西申（上海）新材料科技有限公司 Modified ultra-high-molecular-weight polyethylene for spherical bearing of railways and bridges and processing method thereof
WO2017001232A1 (en) * 2015-06-29 2017-01-05 Maurer Söhne Engineering GmbH & Co. KG Use of a thermoplastic as a sliding material, method for producing a sliding element, and structural bearing with a sliding element made of thermoplastic
CN111748141A (en) * 2020-08-08 2020-10-09 深州市工程塑料有限公司 Sliding plate for seismic isolation and reduction support and preparation method
IT202000027122A1 (en) * 2020-11-12 2022-05-12 Fip Mec S R L ANTI-FRICTION STRUCTURAL SUPPORT

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109251390A (en) * 2018-07-20 2019-01-22 上海化工研究院有限公司 The preparation method of the wear-resisting lubricating composite of ultra-high molecular weight polyethylene multipurpose
CN111135343B (en) * 2019-12-19 2021-09-14 江苏集萃先进高分子材料研究所有限公司 High-crosslinking high-antioxidant-doped artificial joint prosthesis material and preparation method thereof

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DE4210351A1 (en) * 1992-03-30 1993-10-07 Hoechst Ag Pelletising ultrahigh-mol. wt. polyethylene - by extrusion agglomeration under pressure with given compression ratio, and then cutting into pellets
DE19748616A1 (en) * 1997-11-04 1999-08-12 Hans Henig Welding perforated immersion drum of high or ultra-high molecular weight polyethylene
JP2003214471A (en) * 2002-01-23 2003-07-30 Showa Electric Wire & Cable Co Ltd Damper for vibration control
WO2003064141A1 (en) * 2002-01-29 2003-08-07 Paul Smith Sintering ultrahigh molecular weight polyethylene
JP2003269531A (en) * 2002-03-12 2003-09-25 Bridgestone Corp Slide bearing structure
WO2004009908A1 (en) * 2002-07-19 2004-01-29 Maurer Söhne Gmbh & Co. Kg Sliding bearings for civil engineering and material therefor
EP1719839A2 (en) * 2005-05-03 2006-11-08 RW Sollinger Hütte GmbH Roller cover for road joints

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4210351A1 (en) * 1992-03-30 1993-10-07 Hoechst Ag Pelletising ultrahigh-mol. wt. polyethylene - by extrusion agglomeration under pressure with given compression ratio, and then cutting into pellets
DE19748616A1 (en) * 1997-11-04 1999-08-12 Hans Henig Welding perforated immersion drum of high or ultra-high molecular weight polyethylene
JP2003214471A (en) * 2002-01-23 2003-07-30 Showa Electric Wire & Cable Co Ltd Damper for vibration control
WO2003064141A1 (en) * 2002-01-29 2003-08-07 Paul Smith Sintering ultrahigh molecular weight polyethylene
JP2003269531A (en) * 2002-03-12 2003-09-25 Bridgestone Corp Slide bearing structure
WO2004009908A1 (en) * 2002-07-19 2004-01-29 Maurer Söhne Gmbh & Co. Kg Sliding bearings for civil engineering and material therefor
EP1719839A2 (en) * 2005-05-03 2006-11-08 RW Sollinger Hütte GmbH Roller cover for road joints

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8011142B2 (en) * 2007-02-06 2011-09-06 Alga S.P.A. Sliding pendulum seismic isolator
KR101378411B1 (en) * 2011-06-02 2014-03-28 한국수력원자력 주식회사 Manufacturing of wear resistance reinforced engineering plastics using the radiation method and plastics using thereof
CN104863046A (en) * 2015-05-04 2015-08-26 株洲时代新材料科技股份有限公司 Rubber support containing ultrahigh wear-resistance plate and manufacturing method thereof
WO2017001232A1 (en) * 2015-06-29 2017-01-05 Maurer Söhne Engineering GmbH & Co. KG Use of a thermoplastic as a sliding material, method for producing a sliding element, and structural bearing with a sliding element made of thermoplastic
CN105602064A (en) * 2016-02-01 2016-05-25 西申（上海）新材料科技有限公司 Modified ultra-high-molecular-weight polyethylene for spherical bearing of railways and bridges and processing method thereof
CN111748141A (en) * 2020-08-08 2020-10-09 深州市工程塑料有限公司 Sliding plate for seismic isolation and reduction support and preparation method
IT202000027122A1 (en) * 2020-11-12 2022-05-12 Fip Mec S R L ANTI-FRICTION STRUCTURAL SUPPORT
WO2022101816A1 (en) * 2020-11-12 2022-05-19 Fip Mec S.R.L. Antifriction structural bearing

Also Published As

Publication number Publication date
KR20090009859A (en) 2009-01-23
EP2004913A2 (en) 2008-12-24
ITMI20060735A1 (en) 2007-10-13
CN101421462A (en) 2009-04-29
WO2007116257A3 (en) 2007-12-21
CN101421462B (en) 2012-11-14

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