Formula and Performance Analysis of ZRA Flame Retardant Cable

2023-03-27 13:07

PVC/CPE blends with good flame retardancy can be prepared by 100 parts of PVC/CPE, 11 parts of isodecyl biphenyl phosphate plasticizer, 18 parts of brominated aromatic ester plasticizer, 6 parts of phthalate ester plasticizer, 15 parts of tris (n-octyl decyl) trimellitate plasticizer, 25 parts of aluminum hydroxide, 20 parts of zinc molybdate, 20 parts of calcined aluminum silicate, 3 parts of antimony trioxide, and some other additives.

Among them, isodecyl biphenyl phosphate plasticizer and brominated aromatic ester plasticizer are both plasticizers with flame retardancy. After replacing some phthalate plasticizers, the oxygen index of the material can reach 41.3, and the smoke density is 260 at open flame and 290 at flame retardance. It can be seen that the material has good flame retardancy and smoke suppression performance.

In addition, adding 4-20 parts of phosphate ester plasticizers, 3-7 parts of magnesium hydroxide fillers, 3-6 parts of zinc borate, 3-6 parts of antimony trioxide, and some processing aids to a blend fire retardant film material containing 40-55 parts of PVC and 7-20 parts of CPE, the material has good flame retardancy and smoke suppression properties, while having excellent vapor permeability resistance.

Using PVC/CPE blends as the main material, adding 75 parts each of MAGNIFIN H-5 and H-10 magnesium hydroxide, 15 parts each of phosphate plasticizers, 15 parts each of ammonium molybdate (AOM), 70 parts each of 1-octene ethylene polymer elastomer (ENGAGE EG-8150), and other additives, is also a material with excellent flame retardant and smoke suppression performance, while ensuring mechanical strength and low-temperature performance.

The material has an oxygen index of 34, a peak heat release rate of 73 KW/m2, an average heat release rate of 46 KW/m2, and a total heat release rate of 80 MJ/m2, all of which are the minimum values in the experimental formulations.

In addition, adding molybdenum based compounds and sulfur containing polymers to the polymer at the same time can produce synergistic flame retardancy and smoke suppression effects.