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In the past 20 years of practice, coal mine cables have experienced innovation from non-flame retardant to flame retardant, especially since the promulgation and implementation of the test methods and judgment rules for the flame retardancy of coal mine flame retardant cables (MT 386-1995, MT386-2011), so that the flame retardant performance of coal mine cables has been effectively controlled and improved
.
However, the current flame retardant cables for coal mines (mostly using chlorine-containing polymers as sheath materials) once heated, the amount of smoke released by their combustion is very large
.
Although the light transmittance measured by IEC 61034 or GB/T 17651--1998 is less than 10%, the content of hydrogen chloride (HCl) gas released is very large, and its content exceeds 100 mg/g, and even reaches 200~300mg/g
.
Such a thick smoke, coupled with the irritation and toxicity of toxic gases such as H2S and CO to the human respiratory system, in the narrow environment underground, the affected people simply cannot escape the fire scene
.
According to foreign fire white papers, this kind of ? The casualties in the "secondary disaster" account for 70%~80%
of the total number of fire casualties.
Among the casualties of coal mine fire accidents in China, the proportion of people who are victims of "secondary disasters" is also very large
.
In order to avoid or reduce the "secondary disaster" of fire accidents, the International Electrotechnical Commission (IEC) formulated and revised IEC60754-1 and IEC60754-2 in 1982 and 1989 successively to limit the toxic gas content released when the cable burns (stipulating that the HC1 content is < 5 mg/g, and the pH > of the aqueous solution of the corrosive gas released by combustion 4.
3.
Conductivity <10 tts/ram).
In 1991, IEC 61034 was developed to limit the amount of smoke released when the cable burns (specifying smoke transmittance >60%)
.
The United Kingdom developed naval engineering standards NES 1718 and NES 1713
.
The U.
S.
Navy standard MILS24643 directly uses the NES 1713 standard to detect the toxic gas content released when the cable burns (specified toxicity index <5).
All these standards provide an effective and reliable basis for limiting the smoke and toxic gas released by the combustion of flame-retardant or non-flame-retardant materials such as cables, but in the high-risk industry such as coal mines, China's coal mine cables are almost blank
in the control of low smoke and low toxicity (halogen).
The degree of environmental pollution of low-smoke low-halogen flame retardant cables for coal mines is smaller than that of burning flame-retardant cables for coal mines, that is, low-smoke low-halogen flame-retardant cables for coal mines reduce or reduce the "secondary disasters" caused by cable combustion; At the same time, the performance can meet the requirements of cable materials for coal mines, which is the main direction
in the future.
It is very necessary and important
to develop and apply low-smoke and low-toxicity (halogen) flame retardant cables for coal mines.
In the past 20 years of practice, coal mine cables have experienced innovation from non-flame retardant to flame retardant, especially since the promulgation and implementation of the test methods and judgment rules for the flame retardancy of coal mine flame retardant cables (MT 386-1995, MT386-2011), so that the flame retardant performance of coal mine cables has been effectively controlled and improved
.
However, the current flame retardant cables for coal mines (mostly using chlorine-containing polymers as sheath materials) once heated, the amount of smoke released by their combustion is very large
.
Although the light transmittance measured by IEC 61034 or GB/T 17651--1998 is less than 10%, the content of hydrogen chloride (HCl) gas released is very large, and its content exceeds 100 mg/g, and even reaches 200~300mg/g
.
Such a thick smoke, coupled with the irritation and toxicity of toxic gases such as H2S and CO to the human respiratory system, in the narrow environment underground, the affected people simply cannot escape the fire scene
.
According to foreign fire white papers, this kind of ? The casualties in the "secondary disaster" account for 70%~80%
of the total number of fire casualties.
Among the casualties of coal mine fire accidents in China, the proportion of people who are victims of "secondary disasters" is also very large
.
In order to avoid or reduce the "secondary disaster" of fire accidents, the International Electrotechnical Commission (IEC) formulated and revised IEC60754-1 and IEC60754-2 in 1982 and 1989 successively to limit the toxic gas content released when the cable burns (stipulating that the HC1 content is < 5 mg/g, and the pH > of the aqueous solution of the corrosive gas released by combustion 4.
3.
Conductivity <10 tts/ram).
In 1991, IEC 61034 was developed to limit the amount of smoke released when the cable burns (specifying smoke transmittance >60%)
.
The United Kingdom developed naval engineering standards NES 1718 and NES 1713
.
The U.
S.
Navy standard MILS24643 directly uses the NES 1713 standard to detect the toxic gas content released when the cable burns (specified toxicity index <5).
All these standards provide an effective and reliable basis for limiting the smoke and toxic gas released by the combustion of flame-retardant or non-flame-retardant materials such as cables, but in the high-risk industry such as coal mines, China's coal mine cables are almost blank
in the control of low smoke and low toxicity (halogen).
The degree of environmental pollution of low-smoke low-halogen flame retardant cables for coal mines is smaller than that of burning flame-retardant cables for coal mines, that is, low-smoke low-halogen flame-retardant cables for coal mines reduce or reduce the "secondary disasters" caused by cable combustion; At the same time, the performance can meet the requirements of cable materials for coal mines, which is the main direction
in the future.
It is very necessary and important
to develop and apply low-smoke and low-toxicity (halogen) flame retardant cables for coal mines.