Preparation and properties of modified aluminum diethylphosphinate flame retardant for low‐density polyethylene

Abstract

To improve the flame retardancy of low‐density polyethylene (LDPE) and mechanical properties of LDPE composites, phenol‐formaldehyde aluminum diethylphosphinate microcapsules (PF@ADP) was prepared by in‐situ polymerization with phenol‐formaldehyde (PF) resin as the wall material and halogen‐free flame‐retardant aluminum diethylphosphinate (ADP) as the core material. The effects of PF@ADP on flame retardancy and mechanical properties of LDPE were investigated by methods of combustion experiments, mechanical analysis, thermogravimetric analysis (TGA), and smoke density analysis. The results indicated that, compared with ADP/LDPE composites, the flame retardancy and mechanical properties of PF@ADP/LDPE were obviously improved. With the addition of 20 wt% PF@ADP (PF:ADP = 3:7), the limit oxygen index (LOI) of LDPE composites increased to 30.7% and UL‐94 reached V‐1 grade. The tensile strength and elongation at break reached 12.5 MPa and 431.2%, which was 20.2% and 23.1% higher than that of ADP/LDPE with the same addition. The addition of PF@ADP was beneficial to the smoke suppression of LDPE.

Preparation of boron nitride hybrid containing phosphorus and silicon and its effect on flame retardant, smoke suppression, and thermal conductivity properties of styrene‐butadiene rubber

“…After adding 20 phr ADP, although pCOP, pCO 2 P, and av‐CO 2 Y all decreased to a certain extent, av‐COY increased. This was due to the gas‐phase flame retardant effect of ADP will produce a large number of incomplete combustion products such as CO 31 . This phenomenon improved after replacing ADP with 3 phr h‐BN.…”

Preparation of melamine borate coated red phosphorus microcapsules and use of zinc borate as synergistic flame retardant in polyethylene

“…Therefore, many flame retardants have been used to improve the flame retardance of PE. [4][5][6][7][8] In recent years, halogen-free flame retardants have attracted significant attention from researchers due to their excellent characteristics such as low toxicity, low smoke, environmental-friendly, and they burned without the generation of halogenated fumes. [9][10][11][12][13] Halogen-free flame retardants mainly include phosphorus, nitrogen, boron and metal hydroxide.…”

Synthesis and flame retardant behavior of siloxane functionalized polyethylene

“…3 Generally, FRs used in PE system include halogens, phosphorus and nitrogen compounds, borates, inorganic hydroxides and silicon series. [4][5][6][7][8][9][10][11][12][13][14][15] Different FRs have different flame retardant mechanisms, and they are chosen based on the polymer substrate and the intended use of the materials. Since the use of halogen FR usually causes harm to the environment, the choice of FRs is tending to be more environmentally friendly and safe with the improvement of people's environmental awareness.…”

“…The most traditional way to achieve flame‐retardant PE is to physically modify preformed PE with flame retardant (FR), which can usually prolong the survival time of PE in flame by several times 3 . Generally, FRs used in PE system include halogens, phosphorus and nitrogen compounds, borates, inorganic hydroxides and silicon series 4–15 . Different FRs have different flame retardant mechanisms, and they are chosen based on the polymer substrate and the intended use of the materials.…”