High-tensile stretch dehiscence-resistant halogen-free low-smoke flame-proof polyolefin and uses thereof

Abstract

The invention relates to the improvement of non-halogen low-smoke inflaming retarding polyolefine, which is characterized in that 20-70 parts of PE, 30-80 parts of EVA, 80-110 parts of Mg(OH)2, 30-55wt% of surface active agent, 45-70wt% of fatty acid soap and / or 2-5 parts of dispersant consisting of palmitic acid soap and / or oleate soap, and 5-15 parts of RP. Compared with the prior art, the inflaming retarding polyolefine can obviously increase the dispersive performance of inorganic flame retardants and the binding ability with binders, greatly reduces the use level of the flame retardants which is only about 1 / 2 of the former; the elongation at break thereof can reach as much as 550 and the index of swealing is more than or equal to 20; the non-halogen low-smoke inflaming retarding polyolefine increases the plastic working of materials, reduces the stress of a molding heat machine, basically removes the influence of the inorganic flame retardants on the elongation at break and the index of swealing reduction, and effectively solves the foundation reason of the cracking; secondly, the density of the polyolefine is low and not more than 1.29; the cost can be reduced by 10-20%. The non-halogen low-smoke inflaming retarding polyolefine not only can be used in various inflaming retarding soft product products, in particular to be used as cable insulation and / or a sheath, and effectively solves the industry long-standing problem that the inflaming retarding polyolefine insulation and the sheath easily crack.

Description

technical field [0001] The invention is an improvement to the halogen-free low-smoke flame-retardant polyolefin, especially relates to the halogen-free low-smoke flame-retardant polyolefin with high elongation and good crack resistance and its application in cables. Background technique [0002] Halogen-free low-smoke flame-retardant polyolefin plastics (such as polyethylene (PE) or polyethylene vinyl acetate (EVA) mixed with polyethylene (PE) as the base material), in order to obtain excellent flame retardancy and achieve halogen-free Requirements, the use of magnesium hydroxide (Mg(OH) 2 ) or aluminum hydroxide (AL(OH) 3 ) or the inorganic flame retardant material of the mixed system of the two. For example, take polyolefin cable sheath as an example, the composition of this kind of halogen-free low-smoke flame-retardant polyolefin is shown in Table 1. The addition of high-addition inorganic flame-retardant materials causes a large drop in the mechanical and physical pr...

AI Technical Summary

Problems solved by technology

[0012] In the above-mentioned prior art, although the composition ratios are different, a common phenomenon is that the amount of inorganic flame retardant basically exceeds the base material, so the elongation at break is generally low, generally not more than 400, and none of them gives a melt flow rate. Index (cannot reflect the characteristics of no cracking), so objectively, the problem of cracking has not been effectively solved; secondly, the density of the obtained materials is relatively high, all of which are above 1.3, resulting in high material cost