News Details
Polyolefin brominated flame retardants
2017-12-4 11:15:46
Polyolefin brominated flame retardants
Four tetrabromobisphenol A (TBBPA), six (HBCD) twelve ring alkyl bromide and ten polybrominated diphenyl ether (decaBDE) is the most widely in the world's largest production, the application of three kinds of typical brominated flame retardant polyolefin, polyolefin brominated flame retardant with environmental persistence, long distance migration, bioaccumulation and biological toxicity.
The three typical polyolefin brominated flame retardants have strong hydrophobicity and are easy to adsorb and accumulate in surface soil and sediment. Their natural attenuation in soil / sediment has attracted wide attention of researchers at home and abroad. Biodegradation and abiotic transformation are important components of the natural decay process of polyolefin brominated flame retardants in soil / sediments. Previous studies have focused on biodegradation of brominated flame retardants of polyolefin, but little research has been done on abiotic conversion of polyolefin brominated flame retardants, especially abiotic conversion under reducing conditions.
Recently, Chinese Academy of Sciences, Guangzhou Institute of geochemistry, doctoral tutor Peng Pingan and Li Dan in the bell sound under the guidance of the FES (FeS) and zero valent iron sulfide (S-nZVI) progress in the area of reductive transformation of typical polyolefin brominated flame retardant system. Ferrous sulfide (FeS) is a kind of important reductive minerals, mainly distributed in the hypoxic environment, such as soil, sediment and sediment etc..
It is formed by the reaction of the S2- produced by the sulfate reducing bacteria to the common iron species in the environment, such as dissolved Fe2+, iron oxide and so on. According to the study, the content of FeS in the sediment can be as high as 0.37wt% dry weight. In addition, in artificial environment, such as zero valent iron (nZVI) reaction permeable wall, there is also a general presence of FeS.
On the other hand, the effect of the sulfate reducing bacteria and the input of the dissolved S2- make the nZVI surface form the FeS film and produce the vulcanized zero valent iron (S-nZVI). The results showed that the reduction and transformation of FeS to decaBDE and TBBPA were not significant, but they could significantly reduce HBCD transformation, resulting in the double bromine elimination reaction of HBCD, and gradually transformed into four bromo ring twelve carbene, twelve bromo ring twelve carbon diene and twelve carbon three ring.
The solid characterization analysis showed that both Fe (II) and S (-II) on the surface of FeS were all involved in the reduction and transformation of HBCD. In addition, the reduction and conversion process of HBCD conforms to the pseudo first order kinetic model. When the concentration ratio of FeS to HBCD is 2.3, the conversion of HBCD has the best effect. The results of this study not only improve people's understanding of the natural decay process of HBCD in FeS rich environment, but also provide a theoretical basis for reducing HBCD pollution in the environment.
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP)
Appearance: Colorless Viscous Liquid
Melting Point: -64 ℃
Boiling Point: 315 ℃
Density: 1.512
Flash Point: 249 ℃
Refractive Index: N20 / D 1.503
Specific Gravity 1.490-1.510
Chlorine Content Of 49.5% ± 0.5
Color Value Max 100
Water Content 0.10% Max
Viscosity (25 ° C) 1500-1800 CPS
Acidity (Mg KOH / G 0.10 Max
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP) Use:
The Product Has A High Efficiency Flame Retardant, Low Volatility, High Thermal Stability, Water Resistance, Alkali Stable And Soluble In Most Organic Substances, Processing Performance, With Plastic, Moisture, Anti-Static, Anti-Pull, Anti-Compression Performance. Widely Used In Unsaturated Polyester, Polyurethane Foam, Epoxy Resin, Phenolic Resin, Rubber, Soft Polyvinyl Chloride, Synthetic Fibers And Other Plastics And Coatings At High Temperature Pyrolysis, Can Be Used As Emulsifier And Explosion-Proof Agent
Although the reduction and conversion of TBBPA is not obvious under the FeS system, the TBBPA can be rapidly reduced and converted under the nZVI and S-nZVI systems. Under the S-nZVI system, TBBPA completely debrominated to produce non brominated product bisphenol A (BPA), and the reaction process follows a pseudo first order kinetic model.
Under the nZVI system, TBBPA can not completely debrominate and produce BPA, and the conversion rate is significantly lower than that of S-nZVI to TBBPA. The results of solid surface analysis and electrochemical analysis showed that FeS reduced the aggregation effect between S-nZVI particles, increased the specific surface area of S-nZVI, and accelerated the electron transfer rate of S-nZVI surface. At the same time, the surface of FeS has strong hydrophobicity, which is beneficial to the adsorption of TBBPA on the surface of S-nZVI, thus accelerating the conversion rate of TBBPA.
In addition, compared with nZVI, S-nZVI has longer life and higher reuse rate. This may be because the FeS on S-nZVI surface has strong water stability, which can prevent S-nZVI from reacting with water, prolong the life of S-nZVI, and increase the reuse rate. The results show that S-nZVI, as a new type of nanomaterial, is expected to be applied to the remediation of TBBPA polluted environment.
An analytical method for the determination of polyolefin brominated flame retardants (polyolefin brominated flame retardants) in sewage samples by gas chromatography negative ion chemical ionization mass spectrometry was established. At the same time, water extraction aqueous and particulate phase brominated flame retardant polyolefin by liquid-liquid extraction method through silica gel purification, classic, optimized by gas chromatography mass spectrometry conditions for quantitative analysis, experimental method through strict quality assurance and control procedures, recovery rate, precision instrument, analysis conditions are satisfied with the requirement of quantitative analysis.
The results of sewage analysis showed that the concentration of bromine flame retardant of influent polyolefin was 119.2 ng.L-1, and the three stage effluent was 7.5 ng.L-1, of which BDE-209 and HBCD accounted for 53.9% and 29.9% of the total amount of bromine flame retardants of influent polyolefin, respectively. The overall concentration is lower than the reported level in China.
Polyolefin brominated flame retardants (Brom inated Flame Retardants, referred to as polyolefin brominated flame retardants) are generally divided into two types of addition type and reactive type. The polybrominated diphenyl ethers (PBDEs) and polyolefin brominated flame retardant six bromo twelve alkyl ring (Hexabromocyclododecane, referred to as HBCD) to add type brominated flame retardant polyolefin, due to its excellent flame retardant performance, is widely used in paint, textiles, circuit board, especially electrical appliances.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Four tetrabromobisphenol A (TBBPA), six (HBCD) twelve ring alkyl bromide and ten polybrominated diphenyl ether (decaBDE) is the most widely in the world's largest production, the application of three kinds of typical brominated flame retardant polyolefin, polyolefin brominated flame retardant with environmental persistence, long distance migration, bioaccumulation and biological toxicity.
The three typical polyolefin brominated flame retardants have strong hydrophobicity and are easy to adsorb and accumulate in surface soil and sediment. Their natural attenuation in soil / sediment has attracted wide attention of researchers at home and abroad. Biodegradation and abiotic transformation are important components of the natural decay process of polyolefin brominated flame retardants in soil / sediments. Previous studies have focused on biodegradation of brominated flame retardants of polyolefin, but little research has been done on abiotic conversion of polyolefin brominated flame retardants, especially abiotic conversion under reducing conditions.
Recently, Chinese Academy of Sciences, Guangzhou Institute of geochemistry, doctoral tutor Peng Pingan and Li Dan in the bell sound under the guidance of the FES (FeS) and zero valent iron sulfide (S-nZVI) progress in the area of reductive transformation of typical polyolefin brominated flame retardant system. Ferrous sulfide (FeS) is a kind of important reductive minerals, mainly distributed in the hypoxic environment, such as soil, sediment and sediment etc..
It is formed by the reaction of the S2- produced by the sulfate reducing bacteria to the common iron species in the environment, such as dissolved Fe2+, iron oxide and so on. According to the study, the content of FeS in the sediment can be as high as 0.37wt% dry weight. In addition, in artificial environment, such as zero valent iron (nZVI) reaction permeable wall, there is also a general presence of FeS.
On the other hand, the effect of the sulfate reducing bacteria and the input of the dissolved S2- make the nZVI surface form the FeS film and produce the vulcanized zero valent iron (S-nZVI). The results showed that the reduction and transformation of FeS to decaBDE and TBBPA were not significant, but they could significantly reduce HBCD transformation, resulting in the double bromine elimination reaction of HBCD, and gradually transformed into four bromo ring twelve carbene, twelve bromo ring twelve carbon diene and twelve carbon three ring.
The solid characterization analysis showed that both Fe (II) and S (-II) on the surface of FeS were all involved in the reduction and transformation of HBCD. In addition, the reduction and conversion process of HBCD conforms to the pseudo first order kinetic model. When the concentration ratio of FeS to HBCD is 2.3, the conversion of HBCD has the best effect. The results of this study not only improve people's understanding of the natural decay process of HBCD in FeS rich environment, but also provide a theoretical basis for reducing HBCD pollution in the environment.
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP)
Appearance: Colorless Viscous Liquid
Melting Point: -64 ℃
Boiling Point: 315 ℃
Density: 1.512
Flash Point: 249 ℃
Refractive Index: N20 / D 1.503
Specific Gravity 1.490-1.510
Chlorine Content Of 49.5% ± 0.5
Color Value Max 100
Water Content 0.10% Max
Viscosity (25 ° C) 1500-1800 CPS
Acidity (Mg KOH / G 0.10 Max
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP) Use:
The Product Has A High Efficiency Flame Retardant, Low Volatility, High Thermal Stability, Water Resistance, Alkali Stable And Soluble In Most Organic Substances, Processing Performance, With Plastic, Moisture, Anti-Static, Anti-Pull, Anti-Compression Performance. Widely Used In Unsaturated Polyester, Polyurethane Foam, Epoxy Resin, Phenolic Resin, Rubber, Soft Polyvinyl Chloride, Synthetic Fibers And Other Plastics And Coatings At High Temperature Pyrolysis, Can Be Used As Emulsifier And Explosion-Proof Agent
Although the reduction and conversion of TBBPA is not obvious under the FeS system, the TBBPA can be rapidly reduced and converted under the nZVI and S-nZVI systems. Under the S-nZVI system, TBBPA completely debrominated to produce non brominated product bisphenol A (BPA), and the reaction process follows a pseudo first order kinetic model.
Under the nZVI system, TBBPA can not completely debrominate and produce BPA, and the conversion rate is significantly lower than that of S-nZVI to TBBPA. The results of solid surface analysis and electrochemical analysis showed that FeS reduced the aggregation effect between S-nZVI particles, increased the specific surface area of S-nZVI, and accelerated the electron transfer rate of S-nZVI surface. At the same time, the surface of FeS has strong hydrophobicity, which is beneficial to the adsorption of TBBPA on the surface of S-nZVI, thus accelerating the conversion rate of TBBPA.
In addition, compared with nZVI, S-nZVI has longer life and higher reuse rate. This may be because the FeS on S-nZVI surface has strong water stability, which can prevent S-nZVI from reacting with water, prolong the life of S-nZVI, and increase the reuse rate. The results show that S-nZVI, as a new type of nanomaterial, is expected to be applied to the remediation of TBBPA polluted environment.
An analytical method for the determination of polyolefin brominated flame retardants (polyolefin brominated flame retardants) in sewage samples by gas chromatography negative ion chemical ionization mass spectrometry was established. At the same time, water extraction aqueous and particulate phase brominated flame retardant polyolefin by liquid-liquid extraction method through silica gel purification, classic, optimized by gas chromatography mass spectrometry conditions for quantitative analysis, experimental method through strict quality assurance and control procedures, recovery rate, precision instrument, analysis conditions are satisfied with the requirement of quantitative analysis.
The results of sewage analysis showed that the concentration of bromine flame retardant of influent polyolefin was 119.2 ng.L-1, and the three stage effluent was 7.5 ng.L-1, of which BDE-209 and HBCD accounted for 53.9% and 29.9% of the total amount of bromine flame retardants of influent polyolefin, respectively. The overall concentration is lower than the reported level in China.
Polyolefin brominated flame retardants (Brom inated Flame Retardants, referred to as polyolefin brominated flame retardants) are generally divided into two types of addition type and reactive type. The polybrominated diphenyl ethers (PBDEs) and polyolefin brominated flame retardant six bromo twelve alkyl ring (Hexabromocyclododecane, referred to as HBCD) to add type brominated flame retardant polyolefin, due to its excellent flame retardant performance, is widely used in paint, textiles, circuit board, especially electrical appliances.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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