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Thermal Stability and Properties of Flame Retarded Glass Fiber Reinforced Polyamide 66 Composite

Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials, College of Science Northeast Forestry University, Harbin 150040, China

Bin Li

Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials, College of Science Northeast Forestry University, Harbin 150040, China, libinzh62{at}163.com

Feitang

Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials, College of Science Northeast Forestry University, Harbin 150040, China

A new flame retardant (FR) was synthesized by using melamine, phosphoric acid and zinc oxide as raw materials. The obtained zinc-ion modified melamine polyphosphate (Zn-MPP) was used as an intumescent flame retardant in glass fiber reinforced polyamide 66 (PA66/GF). The effect of Zn-MPP on flame retardancy, thermal degradation and mechanical properties of intumescent flame retardant reinforced polyamide 66 system (PA66/GF/Zn-MPP) has been investigated. The results demonstrated that Zn-MPP is very effective in flame retardancy of PA66/GF. The limited oxygen index (LOI) value of PA66/GF/Zn-MPP reaches 39.2% when the Zn-MPP loading is 25 wt% in PA66/GF. It was also found that when the Zn-MPP loading is only 22wt% in PA66/GF, the flame retardancy of PA66/GF/FR can still pass V-0 rating, and its LOI value also reaches 37.8%. TGA data obtained in pure nitrogen demonstrated that Zn-MPP has a good ability of char formation itself, and Zn-MPP shows a high initial temperature of the thermal degradation. It was found that Zn-MPP is comparatively stable in the range of processing temperatures of PA66 and is suitable for flame retarding glass fiber reinforced PA66. The PA66/GF/Zn-MPP (22%) has good properties with flame retardancy UL 94V-0 rating (1.6mm), tensile strength 129.4MPa, flexural strength 185.0 MPa, and notched impact strength 7.0 kJ m^-2.

Key Words: melamine polyphosphate • polyamide 66 • glass fiber • flame retardant • reinforced.

This version was published on February 1, 2008

Journal of Reinforced Plastics and Composites, Vol. 27, No. 3, 277-285 (2008)
DOI: 10.1177/0731684407083008


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