Comparison Test between MDH PM5SN & M5SM in EVA-based formula

Comparison Test between MDH PM5SN & M5SM in EVA-based formula


Robyn Gai and Frank Chen

KMT industrial HK limited

Abstract: KMT R&D center have conducted several comparison test between PM5SN from KMT industrial and M5SM from NikoMag. The article analyzes the differences in mechanical performance of the compound when applying different grades of MDH in the same EVA-based compound.

Key Words: magnesium hydroxide, Mg(OH)2, HFFR compounds, polymer science

1. Introduction

Magnesium hydroxide is a filled flame retardant, which can reduce the surface temperature of the filled synthetic material in the flame by releasing water and absorbing a large amount of heat during thermal decomposition. It can inhibit the decomposition of polymers and cool the combustible gas produced. The magnesium oxide produced by the thermal decomposition of magnesium hydroxide is a good refractory material, which can also help improve the fire resistance of synthetic materials, and the water vapor released when it decomposes also has a smoke-suppressing effect. Therefore, magnesium hydroxide is recognized as an excellent flame retardant with triple functions of flame retardancy, smoke suppression and filling in the rubber and plastic.

2. Test Preparation

2.1. Materials Preparation

Prepare the following materials:

Ethylene-vinyl acetate copolymer (EVA), grade 7470K, vinyl acetate (vA) content is 26%, from Formosa Plastics Group; Magnesium hydroxide (MDH) KMT PM5SN, particle size of 1~2μm, from KMT INDUSTRIAL HK LIMITED. Magnesium hydroxide (MDH) M5SM, particle size of 2μm, from NikoMag.

2.2. Test Machine

Pare the following machines:

Sample making: Banbury, Plate Curing Press; Mould; SY-6210-A Electronic Pulling Force Machine.

Test: universal testing machine, melt flow tester, oxygen index meter.

2.3. Test Condition

Keep the test lab site temperature at 23 degrees Celsius and the humidity at 40%.

2.4. Samples Preparation

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.

3. Test Result

Table 1 Basic technical data of two kinds of MDH

MDHParticle size(D50)PurityCoated or Not
KMT PM5SN1~2 μm≥99%Coated
NikoMag M5SM2.0 μm≥99.8%Coated

3.1. Differences of Elongation at Break

Table 2

SampleElongation at Break(%)
KMT PM5SN190±5
NikoMag M5SM182.7

As shown in the Table 2, Elongation of PM5SN is higher than M5SM.

3.2. Differences of Tensile Strength

Table 3

SampleTensile Strength(MPa)
NikoMag M5SM11.2

From table 3, we can tell the tensile strength of PM5SN is higher than that of M5SM.

3.3. Differences of MFI

Table 4

SampleMFI(190℃.5KG) (g/10min)
NikoMag M5SM1.6

From table 4, it can be seen that the MFI of PM5SN is lower than that of M5SM, which means PM5SN’s mechanical processing performance is better.

3.4. Differences of LOI

Table 5

SampleLOI (100*10*1mm)
NikoMag M5SM30

Table 5 shows PM5SN’s flame retardant performance is better.

4. Conclusion

Table 6 M5SM and PM5SN comparison test

According to the above tests, KMT-PM5SN shows better flame retardant performance and mechanical processing performance in this EVA-based formula.

Company Profile

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


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