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The Preparation of Modified Melamine Cyanurate and Study on the Flame Retardant Polyamide 6

Author: YaoFeng
Tutor: LiuYueJun；WeiShanShan
School: Hunan University
Course: Materials Science
Keywords: Polyamide 6 Flame retardants Melamine cyanurate Silica sol Mechanical Properties
CLC: TQ323.6
Type: Master's thesis
Year: 2009
Downloads: 210
Quote: 0
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Abstract


Polyamide 6 (PA6) having excellent performance in various trades get a wide range of applications , but because of the limiting oxygen index is not high , easy combustion and therefore the flame retardant properties of the PA6 article PA6 industry has been concern hot spots. Melamine cyanurate (MCA) , a nitrogen -based flame retardants , with a wide range of applications in efficient flame retardant PA , recently received widespread attention at home and abroad . MCA retardant PA6 fill level needs to be higher to achieve UL-94V0 seriously affect the mechanical properties of PA6 material . Flame retardant PA6 for MCA of the above deficiencies , MCA synthetic base , adding SiO2 sol , synthetic modified MCA flame retardants the SiO2 sol MCA synthesis process , the SiO2 sol MCA particles coated in MCA situ synthesis process generates SiO2 particles . Synthesis method compared with the MCA , this method effectively controls the MCA particle size . The yield , viscosity was measured by infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) analysis and other methods of modifying the MCA structure analyzed by experiment to optimize the synthesis conditions . The results show that the The modified MCA synthesis process is relatively MCA reaction time is greatly reduced , the viscosity of the reaction system has dropped by nearly 50% , the conversion rate reached 99.5% . The modified MCA and PA6 melt blending modified MCA retardant PA6 composite vertical burning test , limiting oxygen index measured mechanical properties test , Vicat softening point temperature testing , thermogravimetric (TG) test , SEM , differential scanning calorimetry (DSC) tests , testing of the rheological behavior of the composites were characterized . Since the system is not the modified MCA flame retardant PA6 material than the presence of SiO2 , flame retardant properties of the composite materials , thermal stability and mechanical properties have improved to some extent . The results showed that the amount of modified MCA 12% (wt%) of PA6 can make flame retardant properties to achieve the level of UL-94V0 , limiting oxygen index of 31 . Vicat softening point temperature reaches 182 ° C , increased nearly 50% compared to the pure PA6 . SEM results show that the modified MCA particles are uniformly dispersed in the PA6 dispersed in PA6 size less than 1μm, be certain to improve compatibility with PA6 . Not the modified MCA retardant PA6 than the tensile strength of the modified the MCA retardant PA6 composite materials increased by 50% to 40% increase in impact strength .

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polycondensation resin and plastic > Polyamide resin and plastic
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