Study On Preparation Of Composite Flame Retardant Materials Concentrated Seawater After Desalination

High-value utilization of ocean resources not only promotes the rapid development of society and economy,but also meets requirements of green and sustainable development.Simultaneously,it has been paid close attention and concern by more and more people.As a kind of harmless clean energy,the waste concentrated seawater of exploration and utilization is one of the subjects,which investigated by researchers.In this paper,the ions of waste concentrated seawater are used to prepared inorganic composite flame retardant materials,the main contents as follows:Firstly,by the method of chemical analysis and atomic absorption spectrophotometer,ion content in the waste concentrated seawater by quantitative analysis.In details,Cl^-,SO₄²-,HCO₃^-and CO₃^2-are determined by method of chemical analysis,K⁺,Mg²⁺and Ca²⁺are determined by method of atomic absorption spectrophotometer,and the value of pH of the waste concentrated seawater is determined by acidity meter.The conclusions are as follow: The pH value is 8.26 approximately.The contents of Cl^-,SO₄²-,HCO₃^-and CO₃^2-are 26.62 g/L?3.295 g/L?1.468 g/L and 0.2979 g/L,respectively.And the contents of K⁺,Mg²⁺and Ca²⁺are 0.4797 g/L?1.000 g/Land 2.800 g/L,respectively.Next,the composite flame retardant materials were prepared by one step synthesis reaction,in which desalination concentrated seawater and sodium hydroxide are used as raw material and precipitating agent,respectively.In this paper,after checking the effect of reaction temperature,reaction time and aging time on magnesium hydroxide and calcium hydroxide precipitation efficiency,and the optimal conditions were determined.The preparation process was further optimized by orthogonal design.Based on optimal reaction conditions,the composite flame retardant materials were characterized by XRD,FTIR,TG,DSC and SEM.The results showed that the optimal reaction conditions are: reaction temperature was 40 ?,the reaction time was 2.5 h and aging time was 3.0 h.Under the conditions of above,the precipitation efficiencies of magnesium hydroxide and calcium hydroxide are the highest,respectively,91.99 % and 99.70 %,respectively.The XRD and FTIR analysis showed that the main component of composite flame retardant materials is magnesium hydroxide and calcium hydroxide,and the TG and DSC analysis suggested thatthe materials have not only good thermal stability but also flame retardancy,which can be developed into a green environmental protection type composite flame retardant materials.The result of SEM analysis showed that the surface morphology is lamellar structure,and agglomeration effect was discovered in certain extent.Thus,it is significant to furhter study how to improve dispersibility and compatibility in the field of polymer materials.Finally,the composite was modified by using sodium stearate.In this paper,the dispersion effect of modification was investigated through modifier amount,time and temperature.In the same time,the modified composite flame retardant materials was characterized by XRD,FTIR,TG,DSC,SEM ? BET and SEM.It indicated that the modified composite with better dispersion effect and compatibility of organic materials could be prepared under the following conditions:the dosage of modifier was 0.04 g,reaction temperature was 160 ?,reaction time was 6 h.Most importantly,there are no novel characteristic peaks appear,which agrees with the main component of inorganic composite flame retardant materials.