Ara king and Frank Chen
KMT INDUSTRIAL HK LIMITED
Formulation was: EVA (7470K) 35%, compatibilizer 5%, antioxidant 0.175%, aluminum hydroxide 60%; Test conditions: 23℃, 40%; and we want to compare two grades KMT-1 and Albemarle 40CD, Martin 104L mechanical properties, finally the test result shows the tensile strength of KMT-1 is 12.64Mpa, the elongation at break is 227, the melt index is 1.9, and the oxygen index is 30.7; the tensile strength of Albemarle 40CD is 12.84Mpa, The elongation at break is 212, the melt index is 2.3, and the oxygen index is 31.8; the tensile strength of Martin 104L is 11.42Mpa, The elongation at break is 210, the melt index is 2.3, and the oxygen index is 30.6.
Key words: halogen free flame retardant formula, aluminum hydroxide, KMT-1, Albemarle 40CD, Martin 104L
1. Materials and Testing
1.1 Materials prepare
Ethylene-vinyl acetate copolymer (EVA), grade 7470K, vinyl acetate (VA) content is 26%, from Formosa Plastics Group; Aluminum Hydroxide KMT-1, particle size of 10000 mesh, from KMT INDUSTRIAL HK LIMITED; Aluminum Hydroxide Albemarle 40CD, Martin 104L particle size is 10000 mesh, from JM Huber Corporation.
Banbury, Plate Curing Press; Mould; SY-6210-A Electronic Pulling Force Machine; Oxygen Index Meter;
1.2 Preheat the Banbury to 100 °C-120 °C, the mixing time is 30 minutes, the mixing temperature is 200 ± 10 °C
Put the dough into the mould which is preheated well in advance (the thickness of the mould frame is 1 ± 0.1 mm), then use plate Curing Press tabletting (prepress: 10MPA, pressure: 10-15mpa, temperature: 220 °C, preheat for 2 Min) , After tabletting cooled to 40-50 °C and got the samples.
1.3 Composite Standard Test Strips made from dies, the tensile properties were tested on SY-6210-A electronic tensile machine with a tensile speed of 250 mm/min and sample size of 120 * 10 * 1mm (GB/T 32129-2015 standard for halogen-free flame retardant cable materials for wire and cable).
1.4 Testing of combustion performance (GB/T 2406.2—2009)
Table 1. Fire retardant ingredients used in this study
|KMT-1||Albemarle 40CD||Martin 104L|
|Particle size (D50)||1.87um||1.45um||1.89um|
|Surface coated or not||uncoated||coated||coated|
2. Results and Discussion
|Elongation at break (%)||212||210||227|
|Tensile Strength (MPa)||12.84||11.42||12.64|
|Particle size ( D50)||1.446||1.889||1.871|
From the above experimental data we can see that:
3.1 under this formula: KMT-1 compared to ALBEMARLE 40CD advantages:
3.11: High Elongation at break
3.2 under this formula: KMT-1 compared to Albemarle 40CD disadvantages:
3.21: Low Melt Index
3.22: Low Oxygen Index
3.3 under this formula: KMT-1 compared to MARTIN 104L advantages:
3.31: High Oxygen Index
3.32: High tensile strength
3.33: High Elongation at break
3.4 Under this formula: KMT-1 compared to Martin 104L disadvantages:
3.41: Low Melt Index
KMT INDUSTRIAL HK LIMITED, headquartered in Gansu, China, research and manufacturer magnesium hydroxide, Aluminum hydroxide, natural brucite powder. www.kmtindustrial.com