Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Utility Patent
1997-07-16
2001-01-02
Silbaugh, Jan H. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
C264S331150, C264S236000, C264S238000, C427S372200, C427S384000, C427S412100, C427S393500
Utility Patent
active
06168738
ABSTRACT:
The present trend in motor vehicles is to replace metal pipework by pipework made of plastics material, and in particular based on polyamide (nylon).
BACKGROUND OF THE INVENTION
A constant concern of motor manufacturers is to improve the fire resistance of installations which convey flammable fluid. To this end, they define standards or at least requirements that must be satisfied by the components used in such installations, and which tend to increase the time they can withstand fire. Thus, at present, requirements are such that any installation conveying a flammable liquid must be capable of withstanding flame for at least 2 minutes.
On average, present-day pipework is based on single or multilayer polyamide withstands flame for about 30 seconds when subjected to the test procedure laid down by certain motor manufacturers such as Renault or Mercedes.
Attempts have thus been made to protect the outside of such pipework, and techniques exist which implement sheaths of aluminum or sheaths of glass fiber cloth that are offset by several millimeters from the pipework so as to prevent the heat of the flame propagating to the thermoplastic pipework and puncturing it as the material thereof melts. Nevertheless, such solutions are expensive because of the material used.
OBJECT AND SUMMARY OF THE INVENTION
The present invention seeks to remedy that main drawback of the state of the art by proposing a method of fireproofing a component for an installation that is designed to convey a flammable fluid such as gasoline.
More precisely, the invention thus provides a method of fireproofing a component made of thermoplastic material and belonging to an installation for distributing a flammable liquid such as a fuel, the method consisting in coating the outside of the component in a compound based on polyvinyl chloride (PVC) grafted, in particular with organosilanes, so as to be capable of being cross-linked in the last stage of product manufacture by raising its temperature, optionally in the presence of moisture, depending on which catalyst for triggering cross-linking has been added to the compound. It has been observed, surprisingly, that the flame resistance of pipework coated in such a layer (or enclosed in a sheath) of PVC that has been cross-linked in this way is very considerably improved, and that this is done at a cost that is much lower than that of known techniques. This flame resistance has been increased by incorporating a finely-divided inorganic filler in the cross-linkable PVC, so that the filler content is equal to 80% to 100% by weight of the resin. It is common practice in this field to express the quantity of filler in terms of percent of resin: in this case, that means that the weight of the inorganic filler is practically equal to the weight of resin used. The inorganic filler may be antimony oxide.
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Deltour Andr{acute over (e)}
Douchet Jean-Claude
Friedman Stuart J.
Jones Kenneth M.
Nixon & Peabody LLP
Nobel Plastiques
Silbaugh Jan H.
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