KMT MDH compare with Japan grade

KMT MDH compare with Japan grade

By:

Ara king and Frank Chen

KMT INDUSTRIAL HK LIMITED 

www.kmtindustrial.com

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Abstract :

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Formulation was: EVA (7470K) 35%, compatibilizer 5%, antioxidant 0.175%, magnesium hydroxide 60%; Test conditions: 23℃, 40%; and we want to compare two grades XK-10000SN/99, XK-10000SS/99, Japan magnesium hydroxide S-6, and 5P-C mechanical properties, finally the test result shows the tensile strength of XK-10000SN/99 is 15.3Mpa, the elongation at break is 204, the melt index is 0.3, and the oxygen index is 33; the tensile strength of XK-10000SS/99 is 16.25Mpa, The elongation at break is 190, the melt index is 0.45, and the oxygen index is 33; the tensile strength of Japan magnesium hydroxide S-6 is 12.5Mpa, The elongation at break is 211, the melt index is 1.9, and the oxygen index is 30; the tensile strength of Japan magnesium hydroxide 5P-C is 13Mpa, The elongation at break is 190, the melt index is 1.4, and the oxygen index is 32;

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Key words: halogen free flame retardant formula, magnesium hydroxide, EVA based formulation

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1. Materials and Testing

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1.1Materials prepare

Ethylene-vinyl acetate copolymer (EVA), grade 7470K, vinyl acetate (vA) content is 26%, from Formosa Plastics Group; Magnesium hydroxide (MH) XK-10000SN/99 and XK-10000SS/99, particle size of 10000 mesh, from KMT INDUSTRIAL HK LIMITED; S-6 and 5P-C, particle size is 10000 mesh, from Japan.

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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2. Results and Discussion

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2.1 Four grade magnesium hydroxide powders

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Table 1. Fire retardant ingredients used in this study

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 XK-10000SN/99XK-10000SS/99S-65P-C
Test conditions23℃,40%23℃,40%23℃,40%23℃,40%
Particle size (D50)1.5um1.6um1.285um1.4um
Surface coated or notcoatedcoatedcoatedcoated
  •  Test result of tensile strength

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Table 2 shows under the formula: EVA (7470K) is 35%, compatibilizer 5%, antioxidant 0.175%, Magnesium hydroxide 60% in the same composition system; The results show that the tensile strength of XK-10000SN/99 is 15.5 MPA, and that of XK-10000SS/99 is 16.25 MPA, and that of S-6 is 12.5 MPA, and that of 5P-C is 13 MPA.

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Table 2.

 

 

2.3Comparison of Elongation at break of two grades in EVA System

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According to Table 3, the content of EVA (7470K) was 35%, compatibilizer 5%, antioxidant 0.175% and Magnesium hydroxide 60%; The results show that the elongation at break of XK-10000SN/99 is 204, and that of XK-10000SS/99 is 190, and that of S-6 is 211, and that of 5P-C is 190. XK-10000SN/99 and XK-10000SS/99 is a fibre structure with high tensile strength and low elongation at break, which can be improved by surface modification. S-6 and 5P-C is a hexagonal crystal structure with the advantage of higher elongation at break.

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Table 3.

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2.4 Comparison of melting index of four grades in EVA System

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According to Table 4, the content of EVA (7470K) was 35%, compatibilizer 5%, antioxidant 0.175% and Magnesium hydroxide 60%

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The results show that the melting index of XK-10000SN/99 is 0.3 and that of XK-10000SS/99 is 0.45, and that of S-6 is 1.9,and that of 5P-C is 1.4..

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The melting index of XK-10000SN/99 is lower than that of S-6, that can be improved by selecting the melting index of the substrate..

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2.5 Comparison of Oxygen Index between four grades in EVA System

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According to Table 5, the content of EVA (7470K) was 35% , compatibilizer 5% , antioxidant 0.175% and Magnesium hydroxide 60%

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The results show that XK-10000SN/99 has a limiting oxygen index of 33, and XK-10000SS/99 has a limiting oxygen index of 33, and S-6 has a limiting oxygen index of 30, and5P-C has a limiting oxygen index of 32.

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XK-10000SN/99 has three points higher oxygen index than S-6 and better flame retardancy.

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3. Conclusion and discussion

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3.1 Elongation at break (%): S-6 is the best one, and then XK-10000SN/99 is better.

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3.2 Tensile Strength (MPa): XK-10000SS/99 is the best one,, and then XK-10000SN/99 is better.

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3.3 LOI (120*10*4): XK-10000SN/99 and XK-10000SS/99 is best.

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3.4 MFI(190℃.5KG): S-6 is the best one, and then 5P-C is better.

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Company Profiles…

KMT INDUSTRIAL HK LIMITED, headquartered in Gansu, China, research and manufacturer magnesium hydroxide, natural brucite powder. www.kmtindustrial.com

Contact: ara@kmtindustrial.com

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