GB2287673A - Composite thermoplastic material for blow moulding applications - Google Patents

Composite thermoplastic material for blow moulding applications Download PDF

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Publication number
GB2287673A
GB2287673A GB9505657A GB9505657A GB2287673A GB 2287673 A GB2287673 A GB 2287673A GB 9505657 A GB9505657 A GB 9505657A GB 9505657 A GB9505657 A GB 9505657A GB 2287673 A GB2287673 A GB 2287673A
Authority
GB
United Kingdom
Prior art keywords
material according
fibres
charge
blow
bending modulus
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Withdrawn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
GB9505657A
Other versions
GB9505657D0 (en
Inventor
Didier Urbain
Jool Breheret
Bernard Renzo
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.)
Laird Holdings Ltd
Original Assignee
Draftex Industries 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
Priority claimed from GB9405578A external-priority patent/GB9405578D0/en
Priority claimed from GB9406990A external-priority patent/GB9406990D0/en
Application filed by Draftex Industries Ltd filed Critical Draftex Industries Ltd
Priority to GB9505657A priority Critical patent/GB2287673A/en
Publication of GB9505657D0 publication Critical patent/GB9505657D0/en
Publication of GB2287673A publication Critical patent/GB2287673A/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/703—Bellows

Abstract

A composite material is disclosed for producing products such as protective bellows by a blow-moulding process and which have to withstand a wide range of temperatures. The material comprises thermoplastic material to which is added between 0.5% and 10% of a charge such as talc or chalk or fibre material such as glass fibre, carbon fibres, or fibres of aranide or cellulose.

Description

COMPOSITE THERMOPLASTIC MATERIAL The invention relates to composite thermoplastic material. One application of such material is for the manufacture of protective bellows for use in vehicle transmission systems. Other possible applications are for protective bellows for the steering mechanism or for shock absorbers of vehicles. However, these are merely examples and the material is not restricted for use on vehicles.
Such bellows need to be able to withstand a wide range of temperatures without any deterioration in their operational characteristics. For example, they need to be able to withstand low temperatures of the order of -40 0C. With the increasing use of catalysers for the exhaust systems of motor vehicles, which may be located close to protective bellows on the vehicle's transmission, and which operate at high temperature, such bellows also need to be able to withstand high temperatures of the order of +1600C.
It is known to use vulcanised elastomers such as ordinary acrylic ethylenes for the manufacture of such bellows.
Such materials have good high temperature operational characteristics but are subject to rigidification at low temperatures and cannot satisfactorily be used below -300C. Bellows produced from such material are expensive because of the manufacturing process required, relatively heavy in weight, and not easily recycled.
Thermoplastic materials are also used, but present thermoplastic materials cannot satisfactorily handle a temperature range from -40 0C to +1600C. Thermoplastic materials commonly used for protective transmission bellows are unsatisfactory at temperatures above +120 0C because, above this temperature, the dynamic characteristics of the material deteriorate. Grades of thermoplastic material presently available which do preserve their dynamic characteristics at high temperature are unsatisfactory at low temperatures because of significant rigidification.
According to the invention, there is provided a composite material suitable for blow-moulding and comprising a thermoplastic material in combination with an additional charge of an inert material.
Examples of materials suitable for producing thermoplastic materials, and embodying the invention, will now be described.
The examples to be described are made from commercially available thermoplastic material, such as having a hardness between 0 and 55 Shore D, and having good resistance to low temperatures (down to -40 0C), to which material is homogenously added, in accordance with the invention, a charge which increases the modulus at high temperatures without causing any deterioration in the properties of the material at low temperatures; in other words, there is only a very slight increase in rigidity of 0 the material at low temperatures (down to -40 C).
The amount of the added charge should be between 0.5 per cent and 10 per cent of the total weight of the material.
The charge preferably is of an inert nature. Suitable charge materials are talc or chalk or reinforcement fibre material such as glass fibre, carbon fibre, or fibres of cellulose or aramide.
The composite material thus produced can be processed by blow-moulding (extrusion or injection). Such processes tend to orientate the fibres in the material so as to be parallel to the direction of flow. The final product thus obtained possesses an anisotropy of properties which produces good resistance to centrifugal effects while retaining flexibility in a transversal sense and without increasing the stiffness of the material. The final products are thus well suited to withstand the forces likely to arise in practice during use of the bellows, in particular forces acting axially on the bellows and also angular forces produced by angular movement of transmission joints.
Such composite materials can have a bending modulus above 30 MPascal at 160 0C but can also have a bending modulus less than 1250 MPascal at -40 C. Where the charge comprises fibre material, these values are obtained in the direction in which the fibres are orientated by the blow-moulding process.
In the case where the charge comprises fibres, these are preferably short fibres not more than about 5mm in length and 0.5mm in diameter.

Claims (12)

1. A composite material suitable for blow-moulding and comprising a thermoplastic material in combination with an additional charge of an inert material.
2. A material according to claim 1, in which the charge comprises talc or chalk.
3. A material according to claim 1, in which the charge comprises reinforcing fibre material.
4. A material according to claim 3, in which the fibre material comprises glass fibre material, carbon fibre material, aramide fibres, or cellulose fibres.
5. A material according to claim 3 or 4, in which the length of the fibres is no more than 5mm and their diameter is no more than 0.5mm.
6. A material according to claim 5, in which the fibres become orientated parallel to each other by and in the direction of the blow-moulding process.
7. A material according to any preceding claim, in which the thermoplastic elastomer has a hardness between 40 and 55 Shore D.
8. A material according to any preceding claim, in which the thermoplastic elastomer and the charge are combined homogenously.
9. A material according to any preceding claim, in which the charge comprises between 0.5 per cent and 10 per cent by weight of the total weight.
10. A material according to any preceding claim, having a bending modulus above 30 MPascal at 160 0C and a bending modulus less than 1250 MPascal at -400C.
11. A material according to claim 6, in which the bending modulus in the direction of the fibres is above 30 MPascal or 160 0C and the bending modulus in the direction of the fibres is less than 1250 MPascals at -400C.
12. A protective bellows for use in an automobile, produced by blow-moulding of a composite thermoplastic material according to any preceding claim.
GB9505657A 1994-03-22 1995-03-21 Composite thermoplastic material for blow moulding applications Withdrawn GB2287673A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9505657A GB2287673A (en) 1994-03-22 1995-03-21 Composite thermoplastic material for blow moulding applications

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9405578A GB9405578D0 (en) 1994-03-22 1994-03-22 Composite thermoplastic material
GB9406990A GB9406990D0 (en) 1994-04-08 1994-04-08 Composite thermoplastic material
GB9505657A GB2287673A (en) 1994-03-22 1995-03-21 Composite thermoplastic material for blow moulding applications

Publications (2)

Publication Number Publication Date
GB9505657D0 GB9505657D0 (en) 1995-05-10
GB2287673A true GB2287673A (en) 1995-09-27

Family

ID=27267111

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9505657A Withdrawn GB2287673A (en) 1994-03-22 1995-03-21 Composite thermoplastic material for blow moulding applications

Country Status (1)

Country Link
GB (1) GB2287673A (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1456744A (en) * 1973-03-13 1976-11-24 Toray Industries Multi-layer wall containers
GB2078662A (en) * 1980-05-07 1982-01-13 Toyo Seikan Kaisha Ltd Plastic bottles and process for preparation thereof
US4320084A (en) * 1976-06-09 1982-03-16 Salga Associates Limited & Company Air conduits and process therefor
EP0201851A2 (en) * 1985-05-08 1986-11-20 Kureha Kagaku Kogyo Kabushiki Kaisha Polyarylenethioether stretched blow-molded vessel and production thereof
EP0211649A2 (en) * 1985-08-06 1987-02-25 E.I. Du Pont De Nemours And Company Process for fabricating tough polyethylene terephthalate articles with low gas and organic liquid permeability
US4892763A (en) * 1984-05-01 1990-01-09 Diego Duse Bottle grade polyester resins reinforced with glass fibers and containers made of such resins
JPH02240134A (en) * 1989-03-15 1990-09-25 Tosoh Corp Thermotropic liquid crystal copolyester
JPH05230372A (en) * 1991-12-13 1993-09-07 Tosoh Corp Resin composition and material for blow molding consisting of the same composition

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1456744A (en) * 1973-03-13 1976-11-24 Toray Industries Multi-layer wall containers
US4320084A (en) * 1976-06-09 1982-03-16 Salga Associates Limited & Company Air conduits and process therefor
GB2078662A (en) * 1980-05-07 1982-01-13 Toyo Seikan Kaisha Ltd Plastic bottles and process for preparation thereof
US4892763A (en) * 1984-05-01 1990-01-09 Diego Duse Bottle grade polyester resins reinforced with glass fibers and containers made of such resins
EP0201851A2 (en) * 1985-05-08 1986-11-20 Kureha Kagaku Kogyo Kabushiki Kaisha Polyarylenethioether stretched blow-molded vessel and production thereof
EP0211649A2 (en) * 1985-08-06 1987-02-25 E.I. Du Pont De Nemours And Company Process for fabricating tough polyethylene terephthalate articles with low gas and organic liquid permeability
JPH02240134A (en) * 1989-03-15 1990-09-25 Tosoh Corp Thermotropic liquid crystal copolyester
JPH05230372A (en) * 1991-12-13 1993-09-07 Tosoh Corp Resin composition and material for blow molding consisting of the same composition

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
WPI Abstract Accession No.90-332398/44 & JP 02 24 0134 A *
WPI Abstract Accession No.93-317699/40 & JP 05 230 372 A *

Also Published As

Publication number Publication date
GB9505657D0 (en) 1995-05-10

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)