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Combustion performance principle
2018/06/27
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Flame retardant effect of organophosphorus compounds is because it can and hydroxyl of the cellulose molecules form ester, prevent the formation of glucose left-handed, dehydration, and further make cellulose generated unsaturated double bond, promote the cellulose molecules formed between crosslinking, increase the formation of the carbon material, flame resistance effect is better. Only when the amount of finishing agent is increased to 10% can the flame combustion be effectively prevented.
1.Principle of fabric burning properties
1.Principle of fabric burning properties
(1) combustion can be divided into flame combustion and non-flame combustion. The former is the combustion of gas or volatile liquid formed during fiber pyrolysis, and the latter is the oxidation of residue (carbon).
(2) the combustion of fiber is related to its pyrolysis products, and the pyrolysis process of different fibers is different.
2. Mechanism of flame retardant
: (1) covering theory of flame retardants in > 500 ℃ in the fiber surface form a blanket has isolation effect, in addition to hinder the supply of O2, also prevent flammable gas spread outward, so as to achieve purpose of flame retardant, such as borax and boric acid.
(2) gas theory: first, the flame retardant dissolves non-combustible gas at the burning temperature and dilutes the flammable gas concentration below the flame concentration; The other is that the flame retardant, when heated, ACTS as a highly reactive floating transfer agent, thus preventing the free radical reaction.
2. Mechanism of flame retardant
: (1) covering theory of flame retardants in > 500 ℃ in the fiber surface form a blanket has isolation effect, in addition to hinder the supply of O2, also prevent flammable gas spread outward, so as to achieve purpose of flame retardant, such as borax and boric acid.
(2) gas theory: first, the flame retardant dissolves non-combustible gas at the burning temperature and dilutes the flammable gas concentration below the flame concentration; The other is that the flame retardant, when heated, ACTS as a highly reactive floating transfer agent, thus preventing the free radical reaction.
(3) heat theory: first, the flame retardant will undergo heat absorption changes at high temperature, such as melting and sublimation, so as to prevent the spread of combustion. The other is the rapid heat dissipation of the fiber, so that the fabric does not reach the burning temperature.
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