GB2462079A - Fabric coated with peroxide containing fluoroelastomer composition - Google Patents

Fabric coated with peroxide containing fluoroelastomer composition Download PDF

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Publication number
GB2462079A
GB2462079A GB0813318A GB0813318A GB2462079A GB 2462079 A GB2462079 A GB 2462079A GB 0813318 A GB0813318 A GB 0813318A GB 0813318 A GB0813318 A GB 0813318A GB 2462079 A GB2462079 A GB 2462079A
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GB
United Kingdom
Prior art keywords
fabric
peroxide
elastomer
coated fabric
fluorine
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB0813318A
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GB0813318D0 (en
Inventor
Peter John Warren
Stephen Winterbottom
Malini Nanavaty
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
James Walker and Co Ltd
Original Assignee
James Walker and Co Ltd
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 James Walker and Co Ltd filed Critical James Walker and Co Ltd
Priority to GB0813318A priority Critical patent/GB2462079A/en
Publication of GB0813318D0 publication Critical patent/GB0813318D0/en
Publication of GB2462079A publication Critical patent/GB2462079A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/08—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/08—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers
    • B29C70/086—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers and with one or more layers of pure plastics material, e.g. foam layers
    • 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
    • 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
    • C08K5/04—Oxygen-containing compounds
    • C08K5/14—Peroxides
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
    • D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
    • D06M11/44—Oxides or hydroxides of elements of Groups 2 or 12 of the Periodic Table; Zincates; Cadmates
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/73—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof
    • D06M11/74—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof with carbon or graphite; with carbides; with graphitic acids or their salts
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/244—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of halogenated hydrocarbons
    • D06M15/256—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of halogenated hydrocarbons containing fluorine
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/693—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with natural or synthetic rubber, or derivatives thereof
    • 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
    • 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
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/102—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2320/00—Organic additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2506/00—Halogenated polymers
    • B05D2506/10—Fluorinated polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2530/00—Rubber or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
    • B29K2077/10—Aromatic polyamides [polyaramides] or derivatives thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2709/00—Use of inorganic materials not provided for in groups B29K2703/00 - B29K2707/00, for preformed parts, e.g. for inserts
    • B29K2709/08—Glass
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
    • D06M2101/16—Synthetic fibres, other than mineral fibres
    • D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M2101/34—Polyamides
    • D06M2101/36—Aromatic polyamides

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Composite Materials (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Laminated Bodies (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Abstract

The coating composition comprises a fluorine containing rubber, a preferably organic peroxide crosslinking agent and preferably a co-agent. The preferably uncured coating is preferably applied by spreading, dip coating or optionally wet calendering. Disclosed coagents include triallyl isocyanurate (TAIC), TAC and TMAIC. Disclosed crosslinking agents include dimethyldi(t-butylperoxy)hexane, dicumyl peroxide and butyl peroxy diisopropylbenzene. The disclosed fabric comprises aramid and glass fibres. The disclosed solvent is MEK. The coated fabric can then be moulded into a rotary or v-ring seal.

Description

Coated Fabric This invention relates to coated fabric and to a method of manufacture of a coated fabric.
Preferred aspects of the invention relate to fabric coated with elastomeric material.
Examples of the invention find application as proofed fabrics for use in elastomeric seals.
Proofed fabric seals are known for use in hydraulic seals and rotary seals. In such applications, the proofed fabric may form a part only of the seal, for example the backing for the contact area of the seal. In some arrangements, the proofed fabric may form the complete seal or a complete portion of the seal. For example, the proofed fabric may form an outer ring of a rotary seal and/or a v-ring or Chevron seal.
The fabric seals comprise a fabric matrix and an elastomeric material. Fluoroelastomer is a common elastomeric material used for such seals due, in part, to the high temperature capability, and good resistance to many chemicals.
There are various methods known for the application of the elastomer to the fabric material including solution coating, dipping and spreading. These and other methods will be familiar to one skilled in the art.
In order to produce the desired properties of the elastomer curing or crosslinking is carried out.
For fluoroelastomer coatings, this has conventionally been carried out using either an amine-based cure system or a bisphenol cure system. Such systems are also well known to the skilled man.
For an amine-based cure system, the polymer is crosslinked using a cure system comprising diamines or diamine donors. Other components of the amine cure system might include for example a metal oxide and/or other components. A bisphenol cure system may also include for example a catalyst and a metal oxide and/or other components.
A number of problems have arisen related to the use of these cure systems in the coating of fabrics.
For example, in the method of solution coating, the pot life of the system is an important factor. For the amine and bisphenol cure systems, the pot life is relatively short. For example, the pot life for a bisphenol cure system might be about 20 minutes, and any coated material produced from this would be unusable for a subsequent moulding operation due to it being at least partially vulcanized (cured) Short pot life has the disadvantage of necessitating long production runs to reduce waste of material. Where a bisphenol cure is used the material will usually start to cure almost immediately it is spread onto the fabric. If the material-coated fabric is to be used in a cured form, for instance in the fabrication of flexible fuel containers, this may not be a significant problem. For applications where fabrication of pre-forms and subsequent moulding is required, there is a need for surface tack and therefore for the the material to be in an uncured state. This problem can be reduced slightly by adding the curative immediately prior to coating of the fabric material, but it has been found that the process remains unsatisfactory in many situations.
Compositions adapted for application to the fabric by spreading can also be less than optimum. For example where an amine or bisphenol cure system is used, the shelf life of the material is relatively limited and it has been found that the material can begin to cure prematurely. This problem can be reduced slightly by refrigeration but this does not provide a full solution to the problem. Also, although there may be a problem with premature cure in the material, there can also be a problem that the rate and extent of cure of the material are low and can lead to undercured finished articles. Post-curing these can often lead to distortion.
There is expectation for the proofed fabric to provide at least the same performance as a corresponding elastomeric seal, with the added benefit of structural reinforcement.
However, when using an amine or bisphenol cure system, it has been found that the resultant proofed fabric can lose tack as the premature cure develops making processing difficult. The provision of residual solvent can reduce this tendency but has health and safety implications.
The properties of the proofed fabric have been found to be less good than those of seal faces using bisphenol cures. The material has a mould fouling tendency and can have poor demouldability. Compression set can be comparatively poor as is acid and steam resistance for some amine cured materials.
For bisphenol cured material the final properties of the proofed fabric are often better than for amine cured materials, although the storage stability is reduced even further for bisphenol systems compared with some amine curing systems.
An object of the present invention is to provide a method for forming proofed fabric including fluoroelastomer which solves or mitigates one or more problems identified herein and/or other problems.
According to an aspect of the invention there is provided a method of forming a coated fabric including the steps of: providing a fabric; providing a coating material, the coating material including a peroxide curable fluorine-containing elastomer, and a peroxide curing composition; and applying the coating material to the fabric.
By using a peroxide curing system, many of the problems indicated above can be reduced or solved. For example the coating material can have almost an indefinite pot life for some compositions which allows short production runs to be carried out as required.
Also, once spread, the material can be such as to show little signs of premature cure and does not require cold storage. Tack also can remain substantialy constant throughout the material life and therefore residual solvent may not be required.
It is also found that in many systems, the final cured product has similar properties to the fluorine-containing elastomer itself and therefore may not restrict the use of the seal in such cases.
Preferably the method further includes the step of effecting cure of the coating material on the fabric.
However, in some applications, it is preferred for the coated fabric to be provided in a substantially uncured state, to allow for subsequent fabrication and moulding.
The term "fabric" used herein preferably should be interpreted broadly to include any sheet-like form of fibrous material, including for example woven and non-woven fabric and cloth, knitted fabric, webs and sheets of fibres. Fibre materials can include for example cotton, polyester, nylon, aramid, meta-aramid, glass and ceramic or mixtures of more than one type.
Preferably the fluorine content of the elastomer is greater than 60%, preferably 67% or more.
The fluorine-containing elastomer may comprise one or more compounds selected from the group of fluoroelastomers (FKM),. Fluoroelastomers are preferred for many applications.
Where the term fluorine-containing elastomer is used, preferably it is to be understood to relate broadly to any elastomer material including fluorine. Preferably the fluorine content of the fluorinated elastomer is greater than 60%, preferably greater than 64%, greater than 66%, preferably 68% or more. The fluorinated elastomer may be fluoroelastorner (FKM). Other types of fluorinated elastomer might be used. The fluorinated elastomer may include more than one type of fluorinated elastomer, and/or more than one compound being the same type of fluorinated elastomer (for example a mixture of two fluoroelastomers FKM) and/or may include a mixture of one or more fluorinated elastomers together with one or more non-fluorine containing elastomers.
Preferably all of the elastomer is peroxide curable. It is envisaged, however, that one or more components of the elastomer composition might not be peroxide curable.
The peroxide curable fluorinated elastomer may include any suitable fluorinated elastomer. Suitable peroxide curable fluoroelastomers currently available include Viton (RTM) APA grades from DuPont, and P and PL grade fluoroelastomers available from Solvay Solexis. The fluoroelastomer may include TECNOFLON (RTM) P457 from Solvay Solexis. Other similar or equivalent grades or others may be suitable. It is envisaged that new grades of peroxide curable fluorinated elastomers will be developed in the future which will be suitable for application with the present invention.
The fluorinated elastomer may be a component in a fluorinated elastomer composition.
The composition may optionally include other components and/or compounding ingredients, for example fillers.
Fillers suitable include those used for producing conventional fluoroelastomer based mouldings such as carbon black for black articles or a BlancFixe/Wollastonite blends for coloured articles. Other fillers can be used as appropriate.
In some arrangements, preferably the elastomer composition does not include any process aids, which may reduce the adhesion of the elastomer to the fabric.
Preferably the peroxide curing composition comprises an organic peroxide and one or more coagents.
The peroxide curing composition may include any suitable curing system for curing the fluoroelastorner used. In addition to the peroxide, the peroxide curing composition preferably includes other components or coagents. For example, the peroxide curing system may include triallyl isocyanurate (TAlC), triallyl cyanurate (TAC) or trimethallyl isocyanurate (TMAIC) along with a suitable peroxide. The peroxide is preferably an organic peroxide.
Peroxides used may be for example 2, 5-dimethyl-2,5-di(t-butylperoxy)hexane (for example DBPH, Dicumyl peroxide (for example DICUP), di-tert-butyl peroxy diisopropylbenzene (for example Vulcup) or any other peroxides used for crosslinking fluoroelastorners.
The elastomer can be applied to the fabric by any suitable method. For example the coating composition may be applied to the fabric using one or more of calendering, wet calendering, spreading or dip coating.
Other methods could be used as appropriate.
The coating may be applied to all or just a part of the fabric. The coating may be applied to one or more surfaces of the fabric as appropriate.
One or more coating layers may be provided. For example, the same or different coating steps could be carried out a plurality of times. Different coating steps may be provided to coat the same and/or different portions of the fabric. The different coating steps may employ the same or different coating compositions.
The method may include the step of applying a further coat on the coated fabric.
A finishing coat may be applied which may comprise the same or similar material to the fluoroelastomer coating on the fabric or may comprise one or more different materials.
The finishing coat may be applied before or after the curing of the first coat.
Fabrics can be any material having any structure, for example woven, unwoven or knitted.
Preferably the coated fabric is suitable for use in a seal.
Also provided by the method is coated fabric made according to a method described herein.
The invention provides a coated fabric including a fabric element and a fluorine-containing elastomer, wherein the elastomer is peroxide curable or peroxide cured.
Preferably the fabric is suitable for subsequent moulding. Thus preferably the fabric comprises a pre-formed material which can be later moulded. This is a particularly beneficial advantage arising from the use of peroxide curing system. The peroxide curing system gives the material a relatively long pot life. The material on the fabric preferably remains in an uncured state. This can give suitable surface tack to allow the fabrication of performs and subsequent moulding.
Thus in some arrangements, the fluorine-containing elastomer is substantially uncured.
In preferred arrangements, the elastomer includes a fluoroelastomer.
The invention also provides a coated fabric including a fabric element and a coating material, the coating material including a fluorine-containing elastomer and a peroxide curing composition.
The fluoroelastomer, the peroxide curing system and/or the fabric may have one or more of the features described herein.
Thus an aspect of the invention provides a coated fabric including: a fabric material; a peroxide curable fluoroelastomer; and a peroxide cure system.
The fabric material, the fluoroelastomer and/or the peroxide cure system may have one or more of the additional features described herein.
Also provided by the invention is the use of a peroxide curing system in a method of forming a fluorinated elastomer coated fabric.
The invention extends to methods, polymer products and/or coated products substantially as herein described.
Any feature in one aspect of the invention may be applied to other aspects of the invention, in any appropriate combination. In particular, method aspects may be applied to apparatus aspects, and vice versa.
Preferred features of the present invention will now be described, purely by way of
example.
A fluoroelastomer coated fabric is formed by the following example.
A peroxide curable fluoroelastomer composition is prepared comprising the following Parts by weight Technoflon P757 100 Carbon Black N990 30 LuperoxlOlXL-45 3 Diak 7-70% 4 Zinc Oxide 5 The fluoroelastomer composition is mixed with a peroxide for example 2, 5-dimethyl-2,5-di(t-butylperoxy)hexane (DBPH) combined with triallyl isocyanurate (TAlC). Other combinations will be possible.
The peroxide cure system may be mixed separately into the fluoroelastomer composition or the components may be mixed all together or in any appropriate combination or mixing order.
Mixing may be accomplished for example using a two-roll mill or internal mixer.
The fluoroelastomer/peroxide cure system is then applied to the fabric using any appropriate method. For example, the fabric may comprise a woven mixture of aramid and glass fibres and the fabric may be dipped into the fluoroelastomer/peroxide composition with a total solids content of approximately 30% in a suitable solvent such as methyl ethyl ketone (MEK), to ensure the fabric is impregnated with solution. When dry, this can be coated on both sides with a rubber dough' of approximately 70% total solids, using conventional knife over roller' coating equipment. The coated material can be cut into strips or shapes, which in turn can be laminated and/or formed as necessary.
These can be compression moulded into products such as Chevrons (or V' rings), or as stiffening / anti-extrusion elements in elastomer mouldings. Typical cure conditions will be 6 minutes at 180C, though sections above 10mm may require longer cure times, and/or lower cure temperatures.
Optionally a finishing coat of the fluoroelastomer is applied to the coated fabric and a further curing step is carried out.
Depending on the nature of the fabric, the fluoroelastomer/curing compositions used and the process steps, the coating on the fabric may comprise a discrete layer on the fabric and/or may be impregnated into the structure of the fabric and/or into the fibres or other components of the fabric themselves.
The fabric may be precut into appropriate shape for further use, for example in a seal and/or may be cut or processed further.
It will be understood that the present invention has been described above purely by way of example, and modification of detail can be made within the scope of the invention.
Each feature disclosed in the description, and (where appropriate) the claims and drawings may be provided independently or in any appropriate combination.

Claims (16)

  1. CLAIMS1. A method of forming a coated fabric including the steps of: providing a fabric; providing a coating material, the coating material including a peroxide curable fluorine-containing elastomer, and a peroxide curing composition; and applying the coating material to the fabric.
  2. 2. A method according to claim 1, further including the step of effecting cure of the coating material on the fabric.
  3. 3. A method according to claim I or claim 2, wherein the fluorine content of the elastomer is greater than 60%, preferably 67% or more.
  4. 4. A method according to any preceding claim, wherein the fluorine-containing elastomer comprises one or more compounds selected from the group comprising fluoroelastorners (FKM).
  5. 5. A method according to any preceding claim, wherein the peroxide curing composition comprises an organic peroxide and one or more coagents.
  6. 6. A method according to any preceding claim wherein the coating composition is applied to the fabric using one or more of calendering, wet calendering, spreading and dip coating.
  7. 7. A method according to any preceding claim further including the step of applying a further coat on the coated fabric.
  8. 8. A method according to any preceding claim, wherein the coated fabric is for use in a seal.
  9. 9. A coated fabric made according to a method of any of claims I to 8.
  10. 10. A coated fabric including a fabric element and a fluorine-containing elastomer, wherein the elastomer is peroxide curable or peroxide cured.
  11. II. A coated fabric according to claim 9 or claim 10, wherein the fabric is suitable for subsequent moulding.
  12. 12. A coated fabric, optionally according to claim 10 or claim 11, including a fabric element and a coating material, the coating material including a fluorine-containing elastomer and a peroxide curing composition.
  13. 13. A coated fabric according to any of claims 10 to 12, wherein the fluorine-containing elastomer is substantially uncured.
  14. 14. A coated fabric according to any of claims 10 to 13, wherein the elastomer includes a fluoroelastomer.
  15. 15. Use of a peroxide curing system in a method of forming a fluorinated elastomer coated fabric.
  16. 16. A method or product being substantially as herein described
GB0813318A 2008-07-21 2008-07-21 Fabric coated with peroxide containing fluoroelastomer composition Withdrawn GB2462079A (en)

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GB2462079A true GB2462079A (en) 2010-01-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2821543A1 (en) * 2013-07-04 2015-01-07 Cortex Hümbelin AG Synthetic fibre and fabric, manufacturing method and use as a tank

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GB997096A (en) * 1961-09-07 1965-06-30 Minnesota Mining & Mfg Polyblends of polytetrafluoroethylene and fluorocarbon elastomer latices
GB1493945A (en) * 1974-10-30 1977-11-30 Ponomarev L Electrically-insulating materials
GB1548102A (en) * 1976-07-16 1979-07-04 Asahi Glass Co Ltd Thermal method for fluoro-elastomers
US4271275A (en) * 1979-12-14 1981-06-02 E. I. Du Pont De Nemours And Company Fluoroelastomer composition containing oxirane acid acceptor
EP0055407A1 (en) * 1980-12-26 1982-07-07 Asahi Glass Company Ltd. Copolymer for fluorine-containing elastomer having excellent low temperature resistance and alcohol resistance
EP0061927A1 (en) * 1981-03-30 1982-10-06 E.I. Du Pont De Nemours And Company Composite structure of an aromatic polyamide fabric coated with a fluorosilicone rubber
EP0137216A2 (en) * 1983-08-15 1985-04-17 E.I. Du Pont De Nemours And Company Fluorelastomer having improved compression set resistance
WO2002048251A1 (en) * 2000-12-13 2002-06-20 Lauren International, Inc. Fluoroelastomer films prepared by peroxide curing a water-borne fluoroelastomer coating
US20030135001A1 (en) * 2001-12-21 2003-07-17 Hochgesang Paul J. Solventless liquid FKM compounds
EP1860123A1 (en) * 2006-05-26 2007-11-28 Asahi Glass Company, Limited Cross-linkable fluoroelastomer, its composition and cross-linked rubber molded product

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB997096A (en) * 1961-09-07 1965-06-30 Minnesota Mining & Mfg Polyblends of polytetrafluoroethylene and fluorocarbon elastomer latices
GB1493945A (en) * 1974-10-30 1977-11-30 Ponomarev L Electrically-insulating materials
GB1548102A (en) * 1976-07-16 1979-07-04 Asahi Glass Co Ltd Thermal method for fluoro-elastomers
US4271275A (en) * 1979-12-14 1981-06-02 E. I. Du Pont De Nemours And Company Fluoroelastomer composition containing oxirane acid acceptor
EP0055407A1 (en) * 1980-12-26 1982-07-07 Asahi Glass Company Ltd. Copolymer for fluorine-containing elastomer having excellent low temperature resistance and alcohol resistance
EP0061927A1 (en) * 1981-03-30 1982-10-06 E.I. Du Pont De Nemours And Company Composite structure of an aromatic polyamide fabric coated with a fluorosilicone rubber
EP0137216A2 (en) * 1983-08-15 1985-04-17 E.I. Du Pont De Nemours And Company Fluorelastomer having improved compression set resistance
WO2002048251A1 (en) * 2000-12-13 2002-06-20 Lauren International, Inc. Fluoroelastomer films prepared by peroxide curing a water-borne fluoroelastomer coating
US20030135001A1 (en) * 2001-12-21 2003-07-17 Hochgesang Paul J. Solventless liquid FKM compounds
EP1860123A1 (en) * 2006-05-26 2007-11-28 Asahi Glass Company, Limited Cross-linkable fluoroelastomer, its composition and cross-linked rubber molded product

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2821543A1 (en) * 2013-07-04 2015-01-07 Cortex Hümbelin AG Synthetic fibre and fabric, manufacturing method and use as a tank

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