By:
Ara king and Frank Chen
KMT INDUSTRIAL HK LIMITED
www.kmtindustrial.com; info@kmtindustrial.com
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Abstract :
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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.
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Key words: halogen free flame retardant formula, aluminum hydroxide, KMT-1, Albemarle 40CD, Martin 104L
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1. Materials and Testing
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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;
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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.
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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).
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1.4 Testing of combustion performance (GB/T 2406.2—2009)
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Table 1. Fire retardant ingredients used in this study
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KMT-1 | Albemarle 40CD | Martin 104L | |
Test conditions | 23℃,40% | 23℃,40% | 23℃,40% |
Particle size (D50) | 1.87um | 1.45um | 1.89um |
Surface coated or not | uncoated | coated | coated |
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2. Results and Discussion
EVA | 35 | 35 | 35 |
Compatibilizer | 5 | 5 | 5 |
Anti-oxygen | 0.15 | 0.15 | 0.15 |
Albemarle 40CD | 60 | ||
Martin 104L | 60 | ||
KMT-1 | 60 | ||
MFI(190℃.5KG) | 2.3 | 2.3 | 1.9 |
Elongation at break (%) | 212 | 210 | 227 |
Tensile Strength (MPa) | 12.84 | 11.42 | 12.64 |
Test Conditions | 20℃,40% | 20℃,40% | 20℃,40% |
Particle size ( D50) | 1.446 | 1.889 | 1.871 |
LOI (90*10*1) | 31.8 | 30.6 | 30.7 |
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From the above experimental data we can see that:
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3.1 under this formula: KMT-1 compared to ALBEMARLE 40CD advantages:
3.11: High Elongation at break
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3.2 under this formula: KMT-1 compared to Albemarle 40CD disadvantages:
3.21: Low Melt Index
3.22: Low Oxygen Index
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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
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3.4 Under this formula: KMT-1 compared to Martin 104L disadvantages:
3.41: Low Melt Index
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Company Profiles…
KMT INDUSTRIAL HK LIMITED, headquartered in Gansu, China, research and manufacturer magnesium hydroxide, Aluminum hydroxide, natural brucite powder. www.kmtindustrial.com