Study Of Melamine Cyanuric And Its Modified Products Used As A Flame Retardant In Paper

Recent years, with the increasing requirement of fire safety, the problem of flame retardants have been attract more and more comprehensive attention. Conventional efficient flame retardant as halogen flame retardant was found releasing carcinogenic substances in flame process, hindering their application in paper industry. Therefore, development of efficient flame retardant protection instead of halogen flame retardant has is still urgently needed for the paper industry. Melamine cyanurate(MCA) is popular in rubber industry as green flame retardant, a lot of experiments had been applied basing on MCA used in paper industry, then the synthesis process of MCAwas optimized, and11 kinds of inorganic additives were selected to modifie MCA.We discussed the effect of modified MCA flame retardant used in paper, as the result, the best modified MCA was selected to overcomeits shortcomings at molecular level, finally the core-shell structure also called synergetic flame retardant system(SFRS) was formed. The main results are as follows:The increasing amount of MCA brings the paper better flame retardant properties, but also its physical properties will be sacrificed. Paper added with 35% MCA + 0.2% CPAM has been upgraded from the flammable level to the less level. The limiting oxygen index of paper added with 200% MCA + 0.5% CPAM reached 27.2 as the fireproof level. CPAM can effectively help the MCA adsorp plant fiber on its surface through the charge. Mechanism of MCA’seffects on plant fiber is MCA turn sublimation and decomposition by a large amount of water vapor, CO2 and NH3 and other volatile gases not only dilute the oxygen concentration, but also take away a lot of heat.According to the experimental results ofthe conversion rate of MCA, it can be concluded that MCA gets the best conversion rate under this condition: 2% alkali metal salt, stirring speed of 200 R / min, the reaction temperature of 100℃, pH 9.4, and ratio of water by 6 and reaction time of 12 h, then considering the opportunity of MCA of synthetic conditions, the conversion rate reached as high as 98.78%.Using a variety of inorganic additives tomodifie MCA, and the modified MCA were characterized and explored as the flame retardant in paper. The experimental results showed that: adding inorganic additives would not influence the MCA conversion rate and flame retardant effect in the synthesis reaction. Among the eleven kinds of flame retardant additives, poly ammonium phosphate’s effect was the best, followed by zinc borate and antimonous oxide.Study of Ammonium Polyphosphate/Melamine Cyanurate synergetic flame retardant system(SFRS) used in papermaking was applied. SFRSnot only contained a gas source control(MCA) and an acid source(APP),but also could bestowed MCA and APP depending ondifferent situations. MCA as the shell of SFRS acted the gas source in flame retardant and playedthe major role, then app turned to decomposition with orthophosphate which could carbonize the plant fiber’s surface, dramaticly stopping the pyrolysis development of plant fiber.