| 摘要 |
<p>A flame-resistant, non-corrosive metal coating composition comprises (1) a normally solid olefin polymer and, based on the weight of the olefin polymer, (2) from 1 to 80% by weight of a chlorinated hydrocarbon flame retardant, (3) from 0.1 to 5% by weight of a free radical generating cross-linking agent, (4) from 0.1 to 10% by weight of a hydrocarbon solvent solution of a hydrocarbon-soluble lead compound containing a sufficient amount of lead to inhibit the evolution of hydrogen chloride from the composition, and (5) from 0 to 6% by weight of a solid lead phthalate. Preferred olefin polymers (1) are those of ethylene, propylene and butene-1, but copolymers of these monomers may also be used. A long list of suitable comonomers is given. Many conventional chlorinated hydrocarbon flame retardants (2) are specified, vinyl chloride polymers, especially polyvinyl chloride, being preferred. The cross-linking agent (3) may be an organic peroxide, e.g. dicumyl peroxide, or an azo compound. The preferred hydrocarbon-soluble lead compounds (4) are lead octoate, naphthenate and tallate; also listed are lead hexanoate, heptanoate, oleate, linolenate and linolinate, and tetraethyl and tetraphenyl lead. The usual hydrocarbon solvents, e.g. petroleum ether, are used. Conventional fillers, pigments, antioxidants and stabilizers may be included in the composition as well as additional flame-proofing agents. The solid lead phthalate (5) may be replaced by lead oxide or lead sulphate. The compositions are particularly useful for providing insulating coatings for wire, which coating may be effected by any known method.ALSO:Metal substrates, especially copper or tinned copper wire are coated with a flame resistant, non-corrosive metal-coating composition comprising (1) a normally solid olefin polymer and, based on the weight of the olefin polymer, (2) from 1 to 80% by weight of a chlorinated hydrocarbon flame retardant, (3) from 0.1 to 5% by weight of a free radical generating cross-linking agent, (4) from 0.1 to 10% by weight of a hydrocarbon solvent solution of a hydrocarbonsoluble lead compound containing a sufficient amount of lead to inhibit the evolution of hydrogen chloride from the composition, and (5) from 0 to 6% by weight of a solid lead phthalate (see Division C3). The coating is effected at a temperature of from 160 to 200 DEG C. for from 1 to 20 minutes, the temperature being at least sufficient to induce crosslinking of the olefin polymer. Conventional coating methods may be used. Other metal substrates mentioned are iron, steel and aluminium wire. Examples of olefin polymers are given.</p> |
