New halogen free flame retardant

New halogen free flame retardant

Flame-retardant mixtures containing halogen polymers or combination with halogen flame retardants have excellent flame retardant properties and have been widely used as flame retardant materials. However, in the event of a fire, this type of halogen flame retardant material produces a large amount of smoke and toxic corrosive hydrogen halide gas, resulting in a secondary hazard.

New flame retardant system, when burning, smoke volume is small, do not produce poisonous, corrosive gas. Halogen - free flame retardant additive is mainly phosphoric compound and metal hydroxide. These two kinds of compounds, which are not volatilizing and producing corrosive gases, are called harmless flame retardants, as well as several new halogen free flame retardants, such as the flame retardants of silicon and the flame retardants of nitrogen. These new halogen-free flame retardants are new products that meet the trend of international standard.

Phosphorus is a new type of halogen free flame retardant agent is becoming more and more valued, DOPO derivatives, the polyphenol hydroxy and amino derivatives can be used as polymer curing agent, cured epoxy resin by their performance and brominated epoxy resin is very different, especially in the differences of flame retardancy, thermal stability is obvious.

Today's research and development of organophosphorus compounds are from the rapid development of chain structure to the rings of phosphine fe compounds, DOPO and its derivatives, because has a unique molecular structure (biphenyl ring and ring structure), and shown many excellent performance and is a major concern.

It can be said that the DOPO derivative environmental protection flame retardant application is showing the body. DOPO derivatives Ⅲ due to contain two phenolic hydroxyl, can also be used as a curing agent of epoxy resin, the it cured epoxy resin compared with the traditional with TBBA cured epoxy resin, high Tg common 40 ℃, Td and carbon rate is higher than. The phenomenon of not dropping and producing black smoke when burning is very suitable as the substrate of the circuit board.

In addition, the phosphor nitrogen halogen-free flame retardant includes the expansion type halogen-free flame retardant, which mainly works by condensing phase. At lower temperature, the acid source can be esterified polyol (carbon source) and acid which can be used as dehydrating agent. At a slightly higher temperature, the acid reacts with the polyol (carbon source), and the amine in the system ACTS as the catalyst for the esterification reaction, accelerating the reaction.
 


Tert Benzyl diphenyl phosphate (BPDP-71B) use

Tert-butyl phosphate diphenyl phosphate, tert-butylated triphenyl phosphate is halogen-free organophosphorus flame retardant, using a new, excellent performance of phosphorus flame retardant, with excellent thermal stability and hydrolysis Sex. Its high thermal stability makes it as an engineering plastic flame retardant at the same time, can improve the plastic melting performance. Tert-butylated triphenyl phosphate for the liquid, in the resin can make its durability and hydrolysis stability is better, and easy to produce the table and stress cracking. It is widely used in flame retardant PV (, cellulose resin, into the rubber, phenolic resin, epoxy resin, polyene unit fiber.


The system melts before esterification or esterification; Reaction process of water vapor and the non-combustible gases produced by the air has been expansion foam in the molten state of the system and at the same time, the multivariate alcohol and ester dehydration, carbide form inorganic substances and carbon residue, and the foam system further; When the reaction is close to completion, the system is gelatinized and solidified, forming a porous foam carbon layer. Such as polyphosphate, melamine, expanded graphite, melamine phosphate, zinc borate, TGIC.

The amount of aluminum hydroxide AL(OH)3 is more than 40% of the total amount of flame retardant. Aluminum hydroxide itself has three functions, such as flame retardant, smoke suppression and filling, which are non-volatile, non-toxic, and can produce synergistic flame retardation with a variety of substances, which are called inorganic flame retardants.

However, the deficiency of aluminum hydroxide is usually more than 50% of the time. In order to overcome this shortcoming, granulation technology can be used to develop the particle size distribution. Improved package technology to improve its dispersion in polymer; The method of macromolecular bonding method is used.

Magnesium hydroxide (OH)2 is a new type of green flame retardant that has been developed rapidly and is a kind of environment-friendly green flame retardant, which is low smoke, non-toxic, and can neutralize the acid and corrosive gases in the combustion process. The flame retardant mechanism is similar to that of AL(OH) 3. Compared with AL (OH) 3, the decomposition temperature of Mg (OH) 2 than that of AL (OH) 3, 100-100 - c high, can be used in engineering plastics processing temperature higher than 250 c of the flame retardant, and also promote the polymer into the role of carbon, but to achieve a certain amount of flame retardant effect, content need to be more than 50%, had a great influence on the performance of the material. In order to reduce the amount of Mg(OH)2 in the polymer, one method is to modify Mg(OH)2 particles and the other method is to modify the surface of Mg(OH)2 by coating technology to improve its compatibility with the polymer.

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