GB2406857A - Wire coating composition - Google Patents
Wire coating composition Download PDFInfo
- Publication number
- GB2406857A GB2406857A GB0320535A GB0320535A GB2406857A GB 2406857 A GB2406857 A GB 2406857A GB 0320535 A GB0320535 A GB 0320535A GB 0320535 A GB0320535 A GB 0320535A GB 2406857 A GB2406857 A GB 2406857A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnesium hydroxide
- coating composition
- composition
- coating
- wire
- 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- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
-
- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
Abstract
A wire is coated with a coating composition comprising a polypropylene polymer or copolymer, an antioxidant system, and magnesium hydroxide coated with a non-hydrophobic coating. The coating composition does not contain any halogen and the magnesium hydroxide has a surface area of 5-15 m<2>/g. The magnesium hydroxide may be prepared by grinding and is preferably coated with a fatty acid, such as stearic acid. The antioxidant system may comprise a blend of phenol and phosphite based antioxidants. A suitable coating composition may comprise 100 parts polypropylene, 100-200 parts coated magnesium hydroxide, and 1-5 parts antioxidant system. Other additives selected from stabilisers, plasticizers, lubricants, and flame retardants may also be included. A method of preparing the coating composition and its use to coat a wire are also disclosed.
Description
1 2406857 Wire Coating Composition The present invention relates to a wire
coating composition which finds particular utility in automotive applications. The term wire used herein embraces both wires and cables.
It is conventional to provide a polymeric insulation coating around wires and cables.
Such coatings are often made from halogenated polymers, such as polyvinyl chloride (PVC). The main problem of PVC and other halogenated polymers is that upon combustion a large volume of toxic, acidic and highly corrosive hydrogen halide smoke is liberated. As a consequence halogen free polymer compositions have been developed. Examples of such compositions are included in EP 082407A, EP 488381A and US 5032321. These and other prior art halogen-free coating compositions, which are based upon thermoplastic polymer/mineral filler mixtures, possess inadequate abrasion resistance, electrical insulation properties and temperature stability. These coating compositions have a maximum temperature range of only 70-80 C.
Attempts have been made to produce a halogen-free coating composition, which has good abrasion resistance, electrical insulation properties and temperature stability with a rating of 105 C. WO 96/27885 describes one such coating composition.
However, WO 96/27885 refers to the use of precipitated magnesium hydroxide coated with a hydrophobic material such as an alkyl silane. These compounds can be very expensive and are technically inferior with regard to electrical insulation properties.
Recent European legislation has introduced the End of Life Vehicle (ELV) Directive.
This directive specifies that by 2006 over 80% of a car must be suitable for recycling.
It also specifies that recovery must be greater than 5% and waste disposal must be a l maximum of 15%. By 2015 these figures change to over 85% for recycling, greater than 10% for recovery and a maximum of 5% to go for waste disposal.
Thus, the aim of the invention is to provide a recyclable and/or reprocessable halogen- free wire coating composition with improved abrasion resistance, electrical insulation and temperature resistance properties, such as shrinkage or flexibility and which meets the requirements of IS06722.
According to a first aspect of the present invention there is provided a wire as coated with a coating composition, said coating composition comprising polypropylene polymer or copolymer, an antioxidant system and magnesium hydroxide provided with a non-hydrophobic coating, wherein the coating composition does not contain any halogen and wherein the magnesium hydroxide has a surface area in the range from 5 to 15 m2 g According to a second aspect of the present invention there is provided the use of a coating composition in coating a wire, wherein the coating composition comprises polypropylene polymer or copolymer an antioxidant system and magnesium hydroxide provided with a non-hydrophobic coating, wherein the coating composition does not contain any halogen and wherein the magnesium hydroxide has a surface area in the range from 5 to 15 m2 go The wire coating composition of the present invention exhibits the required coating characteristics, but unlike some PVC compounds is readily recyclable. The wire coating composition of the present invention further provides the required electrical insulation, while being flexible, flame resistant, heat stable to 105 C and abrasion resistant such that the requirements of ISO 6722 are met.
The components of the composition are ideally present in the following ratio: Polypropylene 100 php (parts per hundred parts of polymer) Magnesium hydroxide (coated) 1 00php - 200php Antioxidant system lphp 5php The wire coating composition of the present invention is particularly useful for wires in motor vehicle engines, such wires being subjected to high temperature and fluids such as petrol, diesel oil, salt solution and anti-freeze. It is necessary for wire coating materials under vehicle bonnets to have a temperature rating of greater than 100 C at which temperature the coating should remain stable and retain electrical insulation properties. The wire coating compositions according to the invention possess a temperature rating of 105 C.
Suitable polypropylene polymers or copolymers which can be used alone or in combination include PPC 5660, PPC 7760 trade names of ATOFINA, PP7011 L1 and PP7703 L1, trade names of Exxon Mobil.
The preferably ground magnesium hydroxide acts as a filler and flame retardant in the wire coating composition of the present invention. Advantageously the high surface area of the ground magnesium hydroxide allows a lower addition level to be utilised compared to the precipitated magnesium hydroxide traditionally used. This gives rise to a significant cost saving.
Typically, the use of about 110 php of ground magnesium hydroxide gives rise to a wire coating composition having the necessary flame retardancy and electrical insulation properties. Furthermore, the coating composition has a lower specific r gravity than wire coating compositions comprising larger amounts of precipitated magnesium hydroxide thereby resulting in a volume saving.
The preferred amount of 110 php ground magnesium hydroxide content gives the ideal balance between flame retardancy and flexibility of the wire coating composition. A high filler content gives excellent flame retardance. However, at the same time the wire coating will become much less flexible such that the coated wire will fail a standard conductance test whereby a wire is tightly coiled (typically around a mandrel five times the outside diameter of the test sample) and stored in hot water (normally 85 C) whilst under continuous voltage (48 V d.c.). If the coating is not heat stable and flexible then it will crack at the extremities of the coiled wire and electrical breakdown will occur.
Advantageously, the use of ground magnesium hydroxide enables this balance to be maintained, and can actually improve the flexibility of the wire due to a reduction in the amount of magnesium hydroxide incorporated into the coating composition.
Advantageously, the ground magnesium hydroxide is itself coated with a non- hydrophobic material such as a fatty acid, for example, stearic acid. This facilitates the dispersion and improves the abrasion resistance of the wire coating composition.
Preferably, the antioxidant system of the present invention is a single component antioxidant additive. Polyad is a blend of phenol and phosphite based antioxidants and preferably constitutes from I php to 5 php of the coating composition.
Advantageously, the use of an antioxidant system of this type in the composition of the present invention enhances both the insulation resistance and ageing characteristics of the coating. These properties are thought to result from a synergistic interaction of the phenol with the phosphite-based material.
A further advantage of the wire coating composition of the present invention is that it can be extruded onto wire or cable using existing extrusion equipment at speeds similar to that of PVC coatings. Methods for achieving this are well known to those skilled in the art.
The wire coating composition of the present invention may optionally further comprise additives such as stabilizers, plasticisers, lubricants and further flame retardants.
According to a third aspect ofthe present invention there is provided a method for the preparation of a wire coating composition comprising the steps: mixing together polypropylene polymer or copolymer, an antioxidant system magnesium hydroxide, provided with a non-hydrophobic coating, wherein the wire coating composition does not contain any halogen and wherein the magnesium hydroxide has a surface area in the range from S to 15 magi.
In order that the invention may be more readily understood a specific embodiment of the invention is now described in detail.
Example
PPC 56601 100 php Delamin FRA B152 110 php Irganox MD 10243 2 php Calcium Stearate 3 php Polyad4 3 php ' Polypropylene impact copolymer - trade name of ATOFINA 2 Ground magnesium hydroxide - trade name of Delamin Ltd. 3 Irganox MD 1024 - trade name of Ciba 4 Single component blend of phenol and phosphite based antioxidants - trade name of Ciba s A cable coated with the composition of the above example was tested in accordance with ISO 6722 and the results are as follows: Clause lSO 6722 Class B RequirementsResult 6.4 Insulation Volume Resistivity > lO9W mm5.1 x 106 W mm 7.1 Pressure test (4 hours (A I 00 C) No breakdownat Pass IkV 9.2 Scrape abrasion resistance (0.45 2 200 strokesPass mm needle) 10.1 Short term ageing (240 hours at No breakdown at Pass 125 C) lkV 10.3 Thermal overload (6 hours at No breakdown at Pass 150 C) lkV 10.4 Shrinkage (15 minutes (9 s 2mm shrinkage Pass 12.0 Resistance to flame propagation 70 sees extinguish Pass time N.B. The 'clauses' above refer to specific parameters required by ISO 6722 In order to determine the fluid compatibility of the present invention a cable was coated with the composition of the above example and exposed to the test fluids referred to below under the conditions also referred to below: t Test Fluid Test temp O.D. Change O.D. Change Final result ( C) allowed (%) (%) (mandrel wrap & dielectric requirements) Engine oil (IRM 50 15 1.9 Pass 902) Gasoline 23 15 1.9 Pass Diesel fuel 23 15 1.3 Pass Power steering 50 30 1. 9 Pass fluid (IRM 003) Automatic 50 25 2.6 Pass transmission fluid (Dexron III) Engine coolant 50 15 1.3 Pass (Ethylene Glycol & water) It is of course to be understood that the invention is not intended to be restricted to the details of the above embodiments which are described by way of example only.
Claims (10)
1. A wire as coated with a coating composition, said coating composition comprising polypropylene polymer or copolymer, an antioxidant system, and magnesium hydroxide provided with a non-hydrophobic coating, wherein the coating composition does not contain any halogen and wherein the magnesium hydroxide has a surface area in the range from 5to 15m2g.
2. Use of a coating composition in coating a wire wherein the coating composition comprises polypropylene polymer or copolymer, an antioxidant system and magnesium hydroxide provided with a non-hydrophobic coating, wherein the coating composition does not contain halogen and wherein the magnesium hydroxide has a surface area in the range from 5 to 15 m2 get.
3. A coating composition as used in claim 1 or claim 2 wherein the components of the composition are present in the following ratio: Polypropylene 1 OOphp (parts per hundred parts of polymer) Magnesium hydroxide (coated) 1 OOphp - 200php Antioxidant system lphp - 5php
4. A composition according to claim 3 wherein the magnesium hydroxide has been prepared by grinding.
5. A composition according to claim 3 or 4 wherein about 1 lOphp of coated ground magnesium hydroxide is used.
6. A composition according to anyone of claims 3 to 5 wherein the non hydrophobic coating of the magnesium hydroxide is a fatty acid.
S
7. A composition according to claim 6 wherein the fatty acid is stearic acid.
8. A composition according to anyone of claims 3 to 7 wherein the antioxidant system is a blend of phenol and phosphate based antioxidants, and constitutes from lphp to 5php ofthe coating composition.
9. A composition according to anyone of claims 3 to 8 wherein the composition further includes anyone or more of stabilisers, plasticisers, lubricants and flame retardants.
10. A composition according to claim 3, comprising: Polypropylene impact copolymer - I OOphp Ground magnesium hydroxide- 1 1 Ophp IrgonoxMD10242php Calcium stereate- 3php Phenol/phosphte based antioxidant- 3php A method for the preparation of a wire coating composition, said composition being in accordance with any of claims 3 to 10, comprising the steps of:mixing together polypropylene polymer or copolymer with an antioxidant system and with magnesium hydroxide having a non hydrophobic coating, wherein the wire coating composition does not contain any halogen and wherein the magnesium hydroxide has a surface area in the range of 5 to 15 m2 g.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0320535A GB2406857A (en) | 2003-09-02 | 2003-09-02 | Wire coating composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0320535A GB2406857A (en) | 2003-09-02 | 2003-09-02 | Wire coating composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0320535D0 GB0320535D0 (en) | 2003-10-01 |
| GB2406857A true GB2406857A (en) | 2005-04-13 |
Family
ID=28686779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0320535A Withdrawn GB2406857A (en) | 2003-09-02 | 2003-09-02 | Wire coating composition |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2406857A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9530537B2 (en) | 2011-09-30 | 2016-12-27 | Dow Global Technologies Llc | Halogen-free propylene-based insulation and conductor coated with same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0306016A1 (en) * | 1987-09-01 | 1989-03-08 | E.I. Du Pont De Nemours And Company | Flame retardant ethylene copolymer composition |
| EP0352699A1 (en) * | 1988-07-29 | 1990-01-31 | Nippon Unicar Company Limited | Flame retardant composition |
| JPH0517692A (en) * | 1991-07-08 | 1993-01-26 | Sumitomo Electric Ind Ltd | Flame-retardant composition |
| JPH05262926A (en) * | 1992-03-18 | 1993-10-12 | Tosoh Corp | Flame-retardant polyolefin resin composition |
-
2003
- 2003-09-02 GB GB0320535A patent/GB2406857A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0306016A1 (en) * | 1987-09-01 | 1989-03-08 | E.I. Du Pont De Nemours And Company | Flame retardant ethylene copolymer composition |
| EP0352699A1 (en) * | 1988-07-29 | 1990-01-31 | Nippon Unicar Company Limited | Flame retardant composition |
| JPH0517692A (en) * | 1991-07-08 | 1993-01-26 | Sumitomo Electric Ind Ltd | Flame-retardant composition |
| JPH05262926A (en) * | 1992-03-18 | 1993-10-12 | Tosoh Corp | Flame-retardant polyolefin resin composition |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9530537B2 (en) | 2011-09-30 | 2016-12-27 | Dow Global Technologies Llc | Halogen-free propylene-based insulation and conductor coated with same |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0320535D0 (en) | 2003-10-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |