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Low-smoke halogen-free flame retardant filler strip

A flame-retardant filling and particle size technology, which is applied in the field of low-smoke, halogen-free flame-retardant filling strips, can solve the problems of mechanical performance and processing performance degradation, and achieve the effects of increased compatibility, round shape and stable structure

Active Publication Date: 2010-01-06
无锡市恒龙电缆材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve a good flame retardant effect, the amount of flame retardant must meet certain requirements, but with the increase of the amount of flame retardant, it brings about the decline of the mechanical properties and processing properties of the filler material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 40 parts of EVA, 40 parts of aluminum hydroxide with a particle diameter of 2000 mesh and 20 parts of magnesium hydroxide with a particle diameter of 2000 mesh were mixed in a mixer at 1800 rpm for 10 minutes, and then the mixed material was granulated, and the particle diameter was controlled at 3 mm; The prepared particles were mixed with 20 parts of PE powder with a particle size of 200 mesh, 6 parts of paraffin wax, 6 parts of white oil, 3 parts of carbon black and 0.5 part of AC blowing agent (azodicarbonamide) at 1800 rpm for 15 minutes; The temperature of the melting section of the single-screw extruder is controlled at 150-160°C, the above-mentioned mixed materials are added, extruded and foamed at one time, and the formed filling strips are immersed in warm water at 50°C to cool. The filler strip prepared in this example has an oxygen index of 29 and a tensile strength of 15 MPa.

Embodiment 2

[0034] 30 parts of EVA, 35 parts of aluminum hydroxide with a particle diameter of 2000 mesh and 15 parts of magnesium hydroxide with a particle diameter of 2000 mesh were mixed in a mixer at 1800 rpm for 15 minutes, and then the mixed material was granulated, and the particle diameter was controlled at 5 mm; Mix the prepared granules with 10 parts of PE powder with a particle size of 200 mesh, 4 parts of paraffin wax, 4 parts of white oil, and 2 parts of carbon black at 1800 rpm for 15 minutes; the temperature of the melting section of the single-screw extruder is controlled at 150-155 °C , Add the above-mentioned mixed materials, extrude foam molding at one time, and immerse the formed filling strip in warm water at 50°C to cool. The filler strip prepared in this example has an oxygen index of 30 and a tensile strength of 14 MPa.

[0035] The parts stated in Examples 1 and 2 all refer to parts by weight.

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Abstract

The invention discloses a low-smoke halogen-free flame retardant filler strip belonging to the technical field of high-molecular flame retardant materials and comprising the following components: 10-20 parts of PE powder, 30-40 parts of EVA, 35-45 parts of trihydrate alumina, 15-25 parts of magnesium hydrate, 7-12 parts of plasticiser, 1-4 parts of carbon soot and 0-1 part of AC foaming agent. A preparation method of the low-smoke halogen-free flame retardant filler strip comprises the process flows of high-speed mixing, plastic extruding, foam molding and cooling. The prepared low-smoke halogen-free filler strip has high mechanical strength; the tensile strength can reach 15 MPa so as to sufficiently ensure that a cable structure has a stable structure and a rounding shape in cabling; and an oxygen index can reach as high as 30 so as to effectively improve the flame retardant performance of the cable.

Description

technical field [0001] The invention belongs to the technical field of polymer flame-retardant materials, and in particular relates to a low-smoke, halogen-free flame-retardant filling strip. Background technique [0002] When producing cable products, in order to make the outer roundness of the cable good, it is necessary to add fillers to the space between the three cores in the cable. This kind of stuffing has gone through the process of upgrading from tearing film rope or hemp rope to plastic pipe and then to PVC flame retardant stuffing strip. PVC flame retardant filling strips are mainly halogen flame retardant. In the event of a fire, a large amount of smoke will be produced, and toxic, irritating and corrosive hydrogen halide gas will be produced; the smoke will hinder fire fighting and personnel evacuation, and hydrogen halide gas will corrode equipment. It can also endanger human health. The production and use of halogen-free flame-retardant cables has become a t...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L23/06C08K3/22C08K3/04C08K5/01C08J9/10
Inventor 缪小平缪武杰
Owner 无锡市恒龙电缆材料有限公司
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