阅读说明：本技术 一种防火电缆 (Fireproof cable ) 是由 赵洪 孙大奎 周侠 冷荣华 杨光富 于 2019-10-24 设计创作，主要内容包括：本发明公开了一种防火电缆,涉及电力传输载体的技术领域,其包括导电线芯和外护套层,按重量份数计,所述外护套层的原料包括以下组分：氯磺化聚乙烯60-70份；氯化聚乙烯20-30份；EVA 10-15份；加工助剂4-6份；阻燃剂30-45份；细粉20-30份；外加剂10份。通过采用上述技术方案,氯磺化聚乙烯是由低密度聚乙烯或高密度聚乙烯经过氯化和氯磺化反应制得,具有优异的耐臭氧性、耐大气老化型、耐热耐低温性以及耐燃性等。氯化聚乙烯具有优良的耐候性、耐臭氧以及阻燃性,与其它高分子材料具有良好的相容性。EVA具有良好的缓冲、抗震、隔热、防潮以及抗化学腐蚀等优点。上述三种高分子材料在混合后,不仅具有良好的加工性能,还具有良好的耐高温以及防火阻燃性能。(The invention discloses a fireproof cable, which relates to the technical field of power transmission carriers and comprises a conductive wire core and an outer sheath layer, wherein the outer sheath layer comprises the following raw materials in parts by weight: 60-70 parts of chlorosulfonated polyethylene; 20-30 parts of chlorinated polyethylene; 10-15 parts of EVA; 4-6 parts of a processing aid; 30-45 parts of a flame retardant; 20-30 parts of fine powder; 10 parts of an additive. By adopting the technical scheme, the chlorosulfonated polyethylene is prepared from low-density polyethylene or high-density polyethylene through chlorination and chlorosulfonation reactions, and has excellent ozone resistance, atmospheric aging resistance, heat resistance, low temperature resistance, flame resistance and the like. The chlorinated polyethylene has excellent weather resistance, ozone resistance and flame retardance, and has good compatibility with other high polymer materials. EVA has good buffering, antidetonation, thermal-insulated, dampproofing and advantage such as anti chemical corrosion. After being mixed, the three high polymer materials have good processing performance, high temperature resistance and fireproof flame retardant performance.)

1. The utility model provides a fireproof cable, includes conductive core and oversheath layer, its characterized in that: the raw materials of the outer sheath layer comprise the following components in parts by weight,

60-70 parts of chlorosulfonated polyethylene;

20-30 parts of chlorinated polyethylene;

10-15 parts of EVA;

4-6 parts of a processing aid;

30-45 parts of a flame retardant;

20-30 parts of fine powder;

10 parts of an additive.

2. A fire-resistant cable according to claim 1, wherein: the processing aid adopts polyethylene wax.

3. A fire-resistant cable according to claim 1, wherein: the flame retardant comprises 2: 1 and a silicone oil.

4. A fire-resistant cable according to claim 1, wherein: the fine powder is nano aluminum hydroxide.

5. A fire-resistant cable according to claim 1, wherein: the additive comprises 9 parts by weight of tetrabromophthalic acid dihexyl ester.

6. A fire-resistant cable according to claim 1, wherein: the additive comprises 1 part of tetrabromophthalate dioctyl ester by weight.

7. A fire-resistant cable according to any one of claims 1-6, wherein: the preparation method of the outer sheath layer comprises the following steps,

s1, melting and mixing chlorosulfonated polyethylene, chlorinated polyethylene and EVA;

s2, adding polyethylene wax, flame retardant, nano aluminum hydroxide, dihexyl tetrabromophthalate and dioctyl tetrabromophthalate, and treating with ultrasonic wave to mix them uniformly;

and S3, extrusion molding.

Technical Field

The invention relates to the technical field of power transmission carriers, in particular to a fireproof cable.

Background

The wire and cable is a wire product for transmitting electric energy and information and realizing electromagnetic energy conversion, and comprises a conductor and an insulating sheath sleeved on the conductor. The sheath has a protective effect on the conductor, which requires that the sheath has excellent electrical insulation properties, and when a fire occurs, the sheath also needs to have good flame retardant, aging resistance and high temperature resistance.

A Chinese patent with an authorization publication number of CN205751670U discloses a weather-resistant, wear-resistant and anti-aging modified nitrile rubber cable material which is prepared from the following raw materials in parts by weight: 25-30 parts of nitrile rubber, 20-24 parts of EVA (ethylene-vinyl acetate), 5-8 parts of polyvinyl acetate, 20-24 parts of ethylene-propylene-diene monomer, 10-12 parts of cork particles, 4-5 parts of tricresyl phosphate, 1-2 parts of antioxidant 10351-2, 2, 6-di-tert-butyl-p-cresol, 4-5 parts of zinc oxide, 1-2 parts of vinyl triethoxysilane, 2-3 parts of aluminum stearate, 2-4 parts of rapeseed oil, 1-2 parts of silane coupling agent KH 5501, 1-2 parts of accelerator DM, 3-4 parts of zinc oxide, 30-34 parts of N220 carbon black, 23-25 parts of N550 carbon black, 1-2 parts of sulfur and 4-5 parts of auxiliary agent; the auxiliary agent comprises the following raw materials in parts by weight: 20-25 parts of celestite, 3-4 parts of cross-linking agent TAC, 2-3 parts of dipentaerythritol hexaacrylate, 2-3 parts of dimethyl silicone oil, 1-2 parts of silicon carbide, 1-2 parts of urotropine, 2-3 parts of aminopropyl triethoxysilane, 1-2 parts of accelerator CZ, 3-4 parts of vermiculite, 1-2 parts of zinc borate, 2-3 parts of zinc oxide and 1-2 parts of pepper seed oil.

The cable has the characteristics of good mechanical property, weather aging resistance, wear resistance, high temperature resistance and the like, but has defects in fireproof and flame retardant properties and needs to be improved.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a fireproof cable which has good fireproof and flame-retardant properties.

In order to achieve the purpose, the invention provides the following technical scheme:

the fireproof cable comprises a conductive wire core and an outer sheath layer, wherein the outer sheath layer comprises the following raw materials in parts by weight: 60-70 parts of chlorosulfonated polyethylene; 20-30 parts of chlorinated polyethylene; 10-15 parts of EVA; 4-6 parts of a processing aid; 30-45 parts of a flame retardant; 20-30 parts of fine powder; 10 parts of an additive.

By adopting the technical scheme, the chlorosulfonated polyethylene is prepared from low-density polyethylene or high-density polyethylene through chlorination and chlorosulfonation reactions, and has excellent ozone resistance, atmospheric aging resistance, heat resistance, low temperature resistance, flame resistance and the like. The chlorinated polyethylene has excellent weather resistance, ozone resistance and flame retardance, and has good compatibility with other high polymer materials. EVA has good buffering, antidetonation, thermal-insulated, dampproofing and advantage such as anti chemical corrosion. After being mixed, the three high polymer materials have good processing performance, high temperature resistance and fireproof flame retardant performance.

Further, the processing aid adopts polyethylene wax.

By adopting the technical scheme, the polyethylene wax is widely applied due to excellent cold resistance, heat resistance, chemical resistance and wear resistance. The fluidity and the demolding property of the system can be improved by adding the polyethylene wax, and the fireproof flame retardant property of the system can be further improved to a certain degree.

Further, the flame retardant comprises 2: 1 and a silicone oil.

By adopting the technical scheme, the ammonium polyphosphate has strong dehydration property, generates phosphoric acid or polyphosphoric acid during high-temperature combustion, easily forms high-viscosity molten glass and a compact carbonized layer on the surface of a combustion object, and isolates a matrix from heat and oxygen. During the combustion process, radicals such as PO or HPO are decomposed to capture active H radicals or OH radicals in a gas phase, and the formation of a porous carbonized foam layer on the surface of the combustion product is promoted to block heat and oxygen.

During combustion, the-Si-O bond in the organic silicon molecule forms a-Si-C bond, and the generated white combustion residue and carbide form a composite inorganic layer, so that volatile matters generated by combustion can be prevented from escaping, oxygen is prevented from contacting with a substrate, and the melt is prevented from dropping, thereby achieving the purpose of flame retardance.

When ammonium polyphosphate and silicone oil are used in combination, phosphorus catalyzes the formation of char at high temperatures, while silicon increases the thermal stability of these char layers, thereby exerting a synergistic flame retardant effect.

Further, the fine powder adopts nano aluminum hydroxide.

By adopting the technical scheme, the nano aluminum hydroxide is used as the filler, and can be decomposed to generate the aluminum oxide and the gaseous water phase under the condition of heat absorption, and the gaseous water phase can cover the surface of the cable, exclude oxygen and dilute combustible gas. Similar to the function of ammonium polyphosphate to form coke, an insulating material is formed on the surface of the cable that contacts the flame, reducing the likelihood of combustion decomposition products from flowing into the combustion gas phase.

Further, the additive comprises 9 parts by weight of tetrabromophthalic dihexyl ester.

By adopting the technical scheme, the dihexyl tetrabromophthalate has excellent plasticizing performance and good flame retardant effect, and the flame retardant effect can form a synergistic effect with the flame retardant of a phosphorus/silicon flame retardant system so as to further improve the flame retardant of the system.

Further, the additive comprises 1 part of tetrabromophthalate dioctyl ester in parts by weight.

By adopting the technical scheme, when the dioctyl tetrabromophthalate and the dihexyl tetrabromophthalate are used together, the system can obtain better flame retardant effect compared with the same amount of dioctyl tetrabromophthalate.

Further, the preparation method of the outer sheath layer comprises the following steps,

s1, melting and mixing chlorosulfonated polyethylene, chlorinated polyethylene and EVA;

s2, adding polyethylene wax, flame retardant, nano aluminum hydroxide, dihexyl tetrabromophthalate and dioctyl tetrabromophthalate, and treating with ultrasonic wave to mix them uniformly;

and S3, extrusion molding.

In conclusion, the invention has the following beneficial effects:

1. the chlorosulfonated polyethylene is prepared by chlorination and chlorosulfonation of low-density polyethylene or high-density polyethylene, and has excellent ozone resistance, atmospheric aging resistance, heat resistance, low temperature resistance, flame resistance and the like. The chlorinated polyethylene has excellent weather resistance, ozone resistance and flame retardance, and has good compatibility with other high polymer materials. EVA has good buffering, antidetonation, thermal-insulated, dampproofing and advantage such as anti chemical corrosion. After being mixed, the three high polymer materials have good processing performance, high temperature resistance and fireproof flame retardant performance.

2. Polyethylene wax is widely used because of its excellent cold resistance, heat resistance, chemical resistance and abrasion resistance. The fluidity and the demolding property of the system can be improved by adding the polyethylene wax, and the fireproof flame retardant property of the system can be further improved to a certain degree.

3. The ammonium polyphosphate has strong dehydration property, generates phosphoric acid or polyphosphoric acid during high-temperature combustion, and easily forms a high-viscosity molten vitreous and compact carbonized layer on the surface of a combustion object to isolate a substrate from heat and oxygen. During the combustion process, radicals such as PO or HPO are decomposed to capture active H radicals or OH radicals in a gas phase, and the formation of a porous carbonized foam layer on the surface of the combustion product is promoted to block heat and oxygen. During combustion, the-Si-O bond in the organic silicon molecule forms a-Si-C bond, and the generated white combustion residue and carbide form a composite inorganic layer, so that volatile matters generated by combustion can be prevented from escaping, oxygen is prevented from contacting with a substrate, and the melt is prevented from dropping, thereby achieving the purpose of flame retardance. When ammonium polyphosphate and silicone oil are used in combination, phosphorus catalyzes the formation of char at high temperatures, while silicon increases the thermal stability of these char layers, thereby exerting a synergistic flame retardant effect.

4. The nano aluminum hydroxide is used as a filler, and can be decomposed under the condition of heat absorption to generate aluminum oxide and a gaseous water phase, and the gaseous water phase can cover the surface of the cable, exclude oxygen and dilute combustible gas. Similar to the function of ammonium polyphosphate to form coke, an insulating material is formed on the surface of the cable that contacts the flame, reducing the likelihood of combustion decomposition products from flowing into the combustion gas phase.

5. The tetrabromophthalate dihexyl ester has excellent plasticizing performance and good flame retardant effect, and the flame retardant effect of the tetrabromophthalate dihexyl ester can form a synergistic effect with the flame retardant of a phosphorus/silicon flame retardant system so as to further improve the flame retardant of the system.

6. When the tetrabromophthalate dihexyl ester and the tetrabromophthalate are used together, the system can obtain better flame retardant effect compared with the same amount of tetrabromophthalate dihexyl ester.

Drawings

FIG. 1 is a flow chart of a method provided by the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and examples.