Different grade of aluminum hydroxide mechanical property compare

By:

Ara king and Frank Chen

KMT INDUSTRIAL HK LIMITED

www.kmtindustrial.com; info@kmtindustrial.com

Abstract :

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
Test conditions	23℃,40%	23℃,40%	23℃,40%
Particle size (D50)	1.87um	1.45um	1.89um
Surface coated or not	uncoated	coated	coated

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 (90101)	31.8	30.6	30.7

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

Company Profiles…

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

Different grade of aluminum hydroxide mechanical property compare