Flame-retardant polyolefin composition having low smoke generation and toxicity

 

(57) Abstract:

The composition has a low smoke generation and toxicity and includes a polyolefin, a complex metal hydroxide of the General formula SB1-xMx(OH)2where M is at least one divalent metal, x = 0,001 to 0.900, and carbon powder. 2 C.p. f-crystals, 2 tab.

The invention relates to flame-retardant polyolefin compositions having low smoke generation and toxicity, and in particular to a fire-resistant material with low smoke emission, intended for use as a material for the shell of electric wires and cables or as a material for various electrical elements.

Since polyolefin polymer materials are generally flexible, have excellent insulating properties and cheaper than other materials, they are widely used as materials for casings of electrical wires and materials for various electrical elements. But since the latter often burn, the materials for the sheath of electric cables and materials for various electrical elements more and more requirements of fire resistance, and such requirements with the new organic halogenated compounds and antimony trioxide. But a flame retardant material used in such a combination, partially decomposed in the process of formation of gaseous halogen, corrosive installation for processing and installation for forming and toxic to personnel.

In addition, there is a disadvantage in obtaining a large amount of smoke containing toxic gas in case of burning. Therefore, from the point of view of safety in production and use, there is increasing demand for containing no halogen flame retardants, and attention is paid to metal hydroxides.

But used as a metal hydroxide aluminum hydroxide begins to degidratirutego at a temperature of about 190oC, which causes the problem of pozerania in a molded product. Therefore, it has the disadvantage in that it is applicable with him polymers limited.

On the other hand, magnesium hydroxide decomposes at high temperature, and applied to him the polymers is not actually limited, and it is currently used as nestorgames halogen fire resistant composite material for casings of electrical wires and materials for various electrical elements.

Ednakaty a large amount of magnesium hydroxide, that leads to technological difficulties, due to the fact that the rheological properties of the polymer deteriorates, and the mechanical properties and processability deteriorates greatly.

In order to overcome these problems, attempts were made to introduce a flame retardant additives, such as red phosphorus or fine carbon powder in a polymeric material based on nestorgames halogen polyolefin with a decrease in the addition of hydroxide to the extent possible. But, there were problems that needed careful handling of phosphorus, and in the case of adding finely dispersed carbon in small quantities to ensure the mechanical properties is not achieved its effectiveness as a flame retardant additive.

The invention is made to resolve the above problems, and aims at obtaining a flame-retardant composition based on polyolefin, which is suitable for materials of the sheath of the electric wire and electric elements, by reducing as far as possible, compared with the addition of traditional flame retardant material, adding, in particular, of the hydroxide to the polymeric material on the basis of nestorgames halogen fine carbon powder adding a flame retardant component to the polyolefin polymer can be significantly reduced, and can be obtained flame-retardant polyolefin composition which has the desired resistance and satisfactory mechanical properties.

In particular, flame-retardant polyolefin composition having low smoke generation and toxicity according to the invention, contains 100 wt.h. polyolefin resin and 60 to 150 wt. including a flame retardant component, which is obtained by adding 1 to 20 wt.h. fine carbon powder to 100 wt.h. complex metal hydroxide, expressed the following General formula I:

Mg1-xM2x+(OH)2(1),

in which

M2+at least one element selected from the group consisting of divalent metal ions Mn2+, Fe2+, Co2+, Ni2+, Cu2+and Zn2+and x has a value satisfying dependencies 0.H.9.

Polyolefin resin is at least one representative selected from the group consisting of polyethylene, polypropylene, copolymer of ethylene and acrylate, a copolymer of ethylene with vinyl acetate and copolymer. But polyethylene is particularly suitable in respect of fire resistance and mechanical properties.

As described above, a flame retardant component nlonako metal hydroxide, expressed in General formula I.

Fine carbon powder is dispersed in the polyolefin resin and is like uglerodsesola epitaxial substrate to efficiently retrieve promoted by carbonization of the catalytic effect of the transition metal in a state of solid solution in the complex hydroxide of the metal, which results in a dramatic improvement in the process of carbonization of the resin.

Therefore, the required fire resistance can be achieved with a small amount of flame retardant, and can be improved physical properties, composition, in particular mechanical properties.

Adding a flame retardant component to the resin is injected 60 - 150 wt. including a flame retardant component per 100 wt.h. the resin. Adding less than 60 wt.h. a flame retardant component, the resistance is insufficient, while when the amount of flame retardant exceeds 150 wt.h. the processability of the composition and mechanical properties of the product are extremely low. A flame retardant component is added, preferably in amounts of 80 to 150 wt.h.

As described above, a flame retardant component of the invention contains 1 to 20 wt.h. fine carbon powder is added to 100 m is varicella the resistance cannot be achieved, and when its content exceeds 20 wt.h. physical properties are low. Preferably, its content is 1 to 15 wt.h.

When using a flame retardant component comprising a complex metal hydroxide and fine carbon powder, in the case of polyolefin resin flame retardant polyolefin compositions can be significantly improved, and can be achieved with low smoke emission and low toxicity. Besides can be improved mechanical properties of the composition.

Examples 1 - 3.

To obtain samples for testing 0.2 wt.h. antioxidant and flame retardant components, such as the Mg0.98Ni0.02- (OH)2, Mg0.95Zn0.05(OH)2and fine carbon powder in quantities specified in the table. 1, is added to 100 wt.h. linear low density polyethylene (hereinafter - LLDPE); the components are mixed in the mixer for biaxial rolls at 130oC and pressed into sheets with a thickness of 1 mm and 3.2 mm; each sheet is extruded in the form of dumbbells and bands. Conducted mechanical tests according to the method of JIS With 3005 and tested for Flammability according to UL 94 VE.

Comparative examples 1 to 4.

For comparison get XID magnesium (Mg(OH)2) is used instead of complex hydroxide of the metal in a flame retardant component in examples 1 - 3.

The test results are given in table. 2.

From table. 2 shows that the resistance is significantly improved, and the mechanical strength is also improved to a practical level when using a flame retardant component comprising a complex metal hydroxide, expressed the General formula I, and fine carbon powder.

On the other hand, the use of simple metal hydroxide instead of a complex metal hydroxide and, when used in conjunction with fine carbon powder in the comparative examples, the required fire resistance will not be achieved in comparative examples 1 to 3, in which a simple metal hydroxide is used in the same amount as a complex metal hydroxide in examples 1 - 3.

In comparative example 4, the desired resistance can be obtained by adding 120 wt.h. metal hydroxide. However, the mechanical properties are practically unsatisfactory, because the tensile strength tensile 8.9 MPa and elongation 498% are insufficient to provide the required strength.

1. Flame-retardant polyolefin composition having low smoke generation and toxicity, containing polyolefin and as a flame retardant component of the complex hydroxide of the metal and fine carbon powder, characterized in that it contains polyolefin polyolefin, which is at least one representative selected from the group consisting of polyethylene, polypropylene, copolymer of ethylene and acrylate, and copolymer of ethylene and vinyl acetate, as well as complex metal hydroxide is a compound of General formula I

Mg1-xMx(OH)2,

where M is at least one divalent metal selected from the group consisting of manganese, iron, cobalt, Nickel, copper and zinc;

x = 0,001 to 0.900,

with the following ratio of components, wt.h.:

The polyolefin - 100

Complex hydroxmethyl in the range between 1:100 and 20:100.

2. The composition according to p. 1, characterized in that it contains a complex hydroxide of the metal compound represented by the General formula I, where M is Nickel and/or zinc.

3. The composition according to p. 1, characterized in that the flame-retardant polyolefin composition contains 80 - 130 wt.h. complex metal hydroxide and carbon powder per 100 wt.h. the polyolefin resin.

 

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