Journal
CARBOHYDRATE POLYMERS
Volume 178, Issue -, Pages 123-130Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2017.08.099
Keywords
Lignocelluloses; Wood pulp paper; Flame retardant; Acid-base synergism; Thermal stability
Categories
Funding
- National Natural Science Foundation of China [51473095]
- Program of Innovative Research Team for Young Scientists of Sichuan Province [2016TD0010]
- Xiamen Southern Oceanographic Center Funds [14GZP004NF04, 14GQT61HJ31, 15GZP023NF01]
- Technology Research Funds Projects of Ocean [201505029]
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Acid-catalytic degradation caused by acid source flame retardants is the main reason for a decline in thermal stability of flame-retarded lignocellulosic materials. In the present research, a guanidine phosphate (GP)/borax (BX) flame retardant system based on acid-base synergistic interaction was designed and used in wood pulp paper (WPP) to solve this problem. Results showed that the treated WPP obtained good flame retardancy with a limiting oxygen index (LOI) value of 35.7%. As a basic flame retardant, borax could chemically combine with the acids released by guanidine phosphate, thus decreasing the acidity of the system in the initial heating stage. In this way, acid-catalytic degradation is greatly retarded on the lignocelluloses to improve thermal stability (the temperature of maximum degradation peak from 286 degrees C to 314 degrees C). Meanwhile, borax was also advantageous to form a denser and firmer condensed phase through reinforcement of the acid-base reaction product, borophosphates, allowing it to provide a protective barrier with higher quality.
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