High flame retardant PVC sheath compound for power cable (1)

High flame retardant PVC sheath compound for power cable (1)

This passage introduces the effect of different flame retardants to the properties of PVC sheath compound.

1. Experiment

1.1 Raw material

PVC resin, DOTP, ESO, Calcium zinc stabilizer, lubricant, processing agent, magnesium hydroxide, aluminum hydroxide, zinc borate, antimony trioxide, ammonium octamolybdate, Zinc Stannate.

1.2 Equipment

Open rubber mixing machine, plate vulcanizing machine, Universal tension machine, Electronic precision balance, oxygen indexer, cone calorimeter, Smoke density meter

1.3 Experiment procedures

Dosing–> mixing–> plasticizing–>Tablet sample preparation–>cutting and prepare the sample–>performance test

2. Result and discussion

2.1 the effect of different flame retardants to the properties of PVC sheath compound.

  • Influence of different amount of magnesium hydroxide and aluminum hydroxide on material properties

As the most commonly used halogen-free flame retardant, magnesium hydroxide and aluminum hydroxide has advantages like: stable, nontoxic, low corrosive, smoke suppression, competitive price…, and the decomposition temperature of MDH is 340℃ which is about 100℃ higher than the ATH, and the smoke suppression performance of MDH is also better than ATH. Below chart shows the influence of different amount of magnesium hydroxide and aluminum hydroxide on material properties.

Chart 1 Influence of different magnesium hydroxide amount on material properties

MDHTensile strength (MPa)Elongation at break (%)Oxygen Index (%)Density (g/cm3)
022.538022.11.247
2022.036523.81.314
4019.835025.21.371
6017.532026.51.421
8016.031027.41.469

Chart 2 Influence of different aluminum hydroxide amount on material properties

ATHTensile strength (MPa)Elongation at break (%)Oxygen Index (%)Density (g/cm3)
022.538022.11.247
2020.933023.01.316
4019.132024.81.379
6016.831026.21.434
8015.228027.11.475

From above charts we can see that adding the amount if MDH/ATH, the density of PVC compound shall increase, tensile strength and elongation at break decrease. Also, when adding same amount of MDH/ATH, PVC compound with MDH has better mechanical performance than that with ATH.

We can also see that the oxygen index of PVC compound also increases slightly when adding MDH/ATH, but there is also study shows that by decrease the particle sizes of MDH/ATH, or do surface modification could decrease MDH/ATH influence on PVC compound properties, and also improve the flame retardant performance.

certain extent when the amount of zinc borate was increased. At the same time, it can be seen from the change of oxygen index of PVC material that zinc borate material can improve the oxygen index of PVC, but when the amount is greater than 12, the oxygen index of PVC material does not increase significantly. In addition, the effect of zinc stannate on mechanical properties of PVC material is consistent with that of zinc borate. What’s different is that the oxygen index is keeping increase with the adding of zinc stannate.

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