Fire-retardant cable coatings are generally composed of tert-acrylic emulsion water-based materials, including various fire retardants and plasticizers. When the paint coating is exposed to fire, it can produce a uniform and dense sponge-like foam insulation layer, which can effectively suppress and block flames. Spread and spread, it plays a protective role for wires and cables. Mainly applicable to fire-retardant treatment of wire and cable in power plants, industrial and mining, telecommunications and civil buildings. It can also be used for the fire protection of objects such as wood structures, metal structures, and buildings that can be combustible.
The main mechanism of action of cable fire retardant coatings is:
(1) The thermal decomposition of the foaming agent, the thermal decomposition of the foaming agent out of the non-combustible gas, such as melamine decomposition of NH3.
(2) The film-forming agent attached to the cable is softened and fused with thermal decomposition, releasing non-combustible gas.
(3) The molten film forming agent forms a foam layer due to expansion of the blowing agent and the gas released from itself.
(4) The catalyst is thermally decomposed to generate a strong water-absorbing substance, and an esterification reaction takes place with the carbon-forming agent of the film-forming foam layer, and the dehydration carbonization reaction forms inorganic substances and carbonized residues.
(5) Under the baking of the catalyst and high-temperature heat source, the carbonization system is gelled and solidified, dehydrated into carbon, forms an unsaturated main chain, undergoes a cyclization bridging reaction, and finally forms a dense and hard black honeycomb carbonized layer. The thickness of the carbonized layer is related to the transfer of heat, and the thicker the carbonized layer, the inversely lower heat transfer.
Construction method:
1. Before the construction of cable fireproof coating, the dust, oil, and sundries on the surface of the cable should be cleaned and polished. After the surface is dry, the fireproof coating can be applied.
2, the cable fire coating construction using spraying, brushing and other methods, when used should be fully stirred evenly, when the paint is slightly thick, can be diluted with appropriate amount of tap water to facilitate the spraying is appropriate.
3. During construction and before the coating is dry, it should be waterproof, anti-exposure, anti-pollution, anti-movement, anti-bending, and repaired in time if damaged.
4, for plastic, rubber sheathed wire and cable, generally more than 5 times directly brushing, coating thickness 0.5-1mm, about the amount of 1.5kg/m2, for the packaging of oil-coated insulation cable, should first be wrapped in a layer of glass cloth , And then brushing, if you are working outdoors or in a humid environment, you should add matching finish varnish.
The main mechanism of action of cable fire retardant coatings is:
(1) The thermal decomposition of the foaming agent, the thermal decomposition of the foaming agent out of the non-combustible gas, such as melamine decomposition of NH3.
(2) The film-forming agent attached to the cable is softened and fused with thermal decomposition, releasing non-combustible gas.
(3) The molten film forming agent forms a foam layer due to expansion of the blowing agent and the gas released from itself.
(4) The catalyst is thermally decomposed to generate a strong water-absorbing substance, and an esterification reaction takes place with the carbon-forming agent of the film-forming foam layer, and the dehydration carbonization reaction forms inorganic substances and carbonized residues.
(5) Under the baking of the catalyst and high-temperature heat source, the carbonization system is gelled and solidified, dehydrated into carbon, forms an unsaturated main chain, undergoes a cyclization bridging reaction, and finally forms a dense and hard black honeycomb carbonized layer. The thickness of the carbonized layer is related to the transfer of heat, and the thicker the carbonized layer, the inversely lower heat transfer.
Construction method:
1. Before the construction of cable fireproof coating, the dust, oil, and sundries on the surface of the cable should be cleaned and polished. After the surface is dry, the fireproof coating can be applied.
2, the cable fire coating construction using spraying, brushing and other methods, when used should be fully stirred evenly, when the paint is slightly thick, can be diluted with appropriate amount of tap water to facilitate the spraying is appropriate.
3. During construction and before the coating is dry, it should be waterproof, anti-exposure, anti-pollution, anti-movement, anti-bending, and repaired in time if damaged.
4, for plastic, rubber sheathed wire and cable, generally more than 5 times directly brushing, coating thickness 0.5-1mm, about the amount of 1.5kg/m2, for the packaging of oil-coated insulation cable, should first be wrapped in a layer of glass cloth , And then brushing, if you are working outdoors or in a humid environment, you should add matching finish varnish.
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