Affiliation:
1. School of Light Industry Science and Engineering Beijing Technology and Business University Beijing China
2. China Light Industry Engineering Technology Research Center of Advanced Flame Retardants Beijing China
3. Petroleum and Chemical Industry Engineering Laboratory of Non‐halogen Flame Retardants for Polymers Beijing China
Abstract
AbstractTo enhance the flame retardant property of fiber‐reinforced polymer composites without adding more flame retardants, we prepared film stacking composites by maintaining a total flame retardant content of 20% and applying a gradient flame retardant strategy. The gradient composites have been designated as 3113FRPLA/F and 1331FRPLA/F, respectively. 3113FRPLA/F is characterized by an augmented concentration of fire‐resistant additives in the surface layer, while 1331FRPLA/F features a reduced content. 20%FRPLA/F is prepared with a homogeneously distributed flame retardant composition. Results derived from LOI test and cone calorimeter test unequivocally demonstrate that 3113FRPLA/F outperforms both 1331FRPLA/F and 20%FRPLA/F in improving flame retardancy. The LOI value of 3113FRPLA/F is 36.1%, exceeding that of 20%FRPLA/F and there is also a reduction in the pk‐HRR compared with 20%FRPLA/F. It is of interest to note that 3113FRPLA/F exhibits the most effective heat insulation properties while 20%FRPLA/F has the worst, which is reflected by the infrared thermal imaging results. It bears mention that the impact strength and tensile strength of 3113FRPLA/F surpasses that of 20%FRPLA/F. In summary, 3113FRPLA/F, characterized by its increased surface concentration of flame retardants, demonstrates the most superior overall performance.Highlights
The characteristics of PLA/fiber composites using a gradient strategy were compared.
The LOI value of 3113FRPLA/F is 36.1%, exceeding that of 20%FRPLA/F.
3113FRPLA/F has the best heat insulation effect while 20%FRPLA/F has the worst.
The impact strength and tensile strength of 3113FRPLA/F surpasses 20%FRPLA/F.
Improving the surface flame retardant concentration increases the overall property.