N. S. Zubkova

Effect of the Polyester Fibre Content in a Blend with Thermostable Fibres on the Flameproofing Indexes of Manufactured Materials

Thermolysis processes were investigated and the flameproofing indexes of fabrics made from blends of thermostable Nomex and SVM fibres with polyester fibres were determined. It was found that difficultly flammable materials can be fabricated in the Nomex composite with a 20-25% polyester content and in the SVM composite with a 35-40% polyester content.

Effect of Phosphorus-Containing Fire-Retardant Systems on Fireproofing and Processing Indexes of Polypropylene

The thermal stability of polypropylene composites containing the microencapsulated ammonium salt of methylphosphonic acid amide and copper-zinc-boron compounds as a fire retardant was investigated. It was shown that incorporation of dizinc hexaborate increases the thermal stability period (MFI of 15 min) in comparison to this index for the composite containing a fire retardant alone (MFI of 2 min), which is due to slowing of decomposition of the fire retardant. It was found that dizinc hexaborate alters thermooxidative degradation of polypropylene containing microencapsulated methylphosphonic acid amide ammonium salt by decreasing the temperature and maximum rate of decomposition. The number of gaseous compounds liberated in thermooxidative decomposition of the composite is much lower than for the initial polypropylene.

Characteristics of the Decrease in the Combustibility of Polypropylene with Multicomponent Flame Retardant Systems

The optimum composition of flame retardant systems (FRS) consisting of 75% aminotrismethylenephosphonic acid ammonium salt (AMP AS) and 25% pentaerythritol (PER) and 1% zeolite (of the weight of the PP composite) which allows obtaining polypropylene with OI = 29.4% is selected. Thermooxidative degradation of PP composites was investigated by TGA. The total amount of volatiles in thermolysis of PP containing 20% three-component FRS (AMP AS/PER/zeolite) is 1.5 time lower than for the initial polymer, which decreases the potential fire hazard of polypropylene.

Use of Fluorine-Containing Compounds for Modification of Polycaproamide

The possibility of increasing the fireproof characteristics of fluorine-containing PCA by additional incorporation of phosphorus- and phosphorus—silicon-containing flame retardants was investigated. Samples of modified PCA with an oxygen index of 28-29% were obtained with these flame retardants. It was found that polyfluorinated alcohol—T-2 fireproofing compound and polyfluorinated alcohol—microencapsulated T-2 fireproofing compound systems alter the direction of the processes that take place in the basic stage of thermal decomposition of the polymer by decreasing the amount and rate of liberation of volatile products and alter the composition of the carbonized residue.

New Fire Retardants for Thermoplastic Fibre-Forming Polymers

The efficacy of the fireproofing effect of amino-(tris-methylenephosphonic acid) and its derivatives in reducing the combustibility of PCA was investigated. It was shown that when amino-(tris-methylenephosphonic acid) ammonium salt modified with polyvinylethoxysiloxane is added to PCA melt, the degree of polymerization of the polymer almost does not change and the fibre obtained acquires a high degree of fireproofing.