Preparation method of silane crosslinked halogen-free flame-retardant polyolefin cable material

A polyolefin cable material, silane cross-linking technology, applied in the direction of insulated cables, cables, circuits, etc., can solve the lack of environmental stress crack resistance, poor dispersion effect, flame retardant dispersion performance and environmental stress crack resistance. And other issues

Active Publication Date: 2013-04-03
上海至正新材料有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The existing silane cross-linked halogen-free flame retardant A material is produced using a twin-screw extruder. The internal thread of the twin-screw extruder is continuous and can only move radially instead of axially. The mixing of polyethylene occurs in Radial, so a large amount of flame retardant is dispersed, and the shearing effect of the melt is not ideal. At the same time, because the thread is continuous, the pressure on polyolefin is very high, and the energy consumption of the corresponding equipment is also increased.
[0005] The traditional two-step method of manufacturing silane cross-linked low-smoke halogen-free flame-retardant cable materials has the following disadvantages: 1. There is a side reaction of peroxide cross-linking in the silane grafting process, and the graft A material has poor fluidity and is not easy to process; 2. Silane The production of material A of cross-linked polyolefin adopt

Method used

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  • Preparation method of silane crosslinked halogen-free flame-retardant polyolefin cable material
  • Preparation method of silane crosslinked halogen-free flame-retardant polyolefin cable material
  • Preparation method of silane crosslinked halogen-free flame-retardant polyolefin cable material

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Example Embodiment

[0058] The invention relates to a preparation method of a silane-crosslinked halogen-free flame-retardant polyolefin cable material. The preparation method of the halogen-free flame-retardant polyolefin cable material adopts a two-step silane cross-linking technology. The silane cross-linked halogen-free flame-retardant The preparation method of polyolefin cable material is composed of flame-retardant graft A material and catalytic master batch B material. Most preferably, the preparation of flame-retardant grafted material A includes the following steps: firstly prepare silane grafted polyolefin resin; use silane grafted polyolefin resin as raw material, mix with modified flame retardant, processing aid, etc. The high-precision feeding loss-in-weight system enters the reciprocating single-screw extrusion granulation unit, where it is mixed, sheared, and extruded at 100-150°C, then sprayed and pelletized for granulation, after cooling, centrifugal dehydration, Boiling and dryin...

Example Embodiment

[0129] Preferred embodiment of the present invention

[0130] A preparation method of silane crosslinked halogen-free flame-retardant polyolefin cable material includes the following steps:

[0131] (1) Preparation of silane grafted polyolefin: graft silane onto polyolefin resin to prepare silane grafted polyolefin;

[0132] (2) Take silane grafted polyolefin as raw material, mix it with flame retardant, processing aid, etc. according to the proportion, and enter the reciprocating single-screw extrusion pelletizing unit through the high-precision K-TRON feeding weight loss system. Mixing, shearing and extruding are carried out at -150℃, and then sprayed and pelletized for granulation. After cooling, centrifugal dehydration, boiling drying, automatic packaging is realized by automatic weighing and packaging system.

[0133] (3) Using polyolefin as the main raw material, adding catalysts, antioxidants and other processing aids, mixing for 3-5 minutes, then conveying to the twin screw, m...

Example Embodiment

[0162] Example 1

[0163] This embodiment provides a method for preparing a silane-crosslinked low-smoke halogen-free flame-retardant polyolefin cable material. The raw materials and dosages used are shown in the table, where:

[0164] Ethylene-vinyl acetate resin is an ethylene-vinyl acetate copolymer resin with a vinyl acetate content of 24-28% in the molecule.

[0165] The melting index of low-density polyethylene resin is 2±0.5g / 10min, produced by Sinopec.

[0166] Silane is Degussa's VTMO.

[0167] The initiator is Akzo's DCP.

[0168] The modified flame retardant is prepared by the following process: adding aluminum hydroxide into a high-speed mixer, and uniformly adding 2% aluminate coupling agent solution of the aluminum hydroxide mass under high-speed stirring.

[0169] The antioxidant is Irganox 1010 type antioxidant produced by Ciba of Switzerland.

[0170] The melt index of the ethylene-octene copolymer is 5g / 10min and the hardness is 75A.

[0171] The catalyst is dibutyl tin di...

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Abstract

The invention provides a silane crosslinked halogen-free flame-retardant polyolefin cable material composition. The polyolefin cable material composition comprises a material A and a material B, wherein the material A comprises the following components in parts by weight: 100 parts of silane grafted polyolefin and 50-150 parts of modified flame retardant, 0.1-0.5 part of material A antioxidant and 0.5-2 parts of material A processing assistant; the modified flame retardant is aluminate coupling agent modified flame retardant; the material B comprises the following components in parts by weight: 100 parts of polyolefin, 0.5-5 parts of catalyst, 0.01-5 parts of copper ion inhibitor, 0.1-0.5 part of material B antioxidant and 5-10 parts of material B processing assistant; and the material A is subjected to reciprocating single-screw mixing and extrusion.

Description

technical field [0001] The invention belongs to the technical field of polymer composite materials, and specifically relates to a preparation method of a silane-crosslinked halogen-free flame-retardant polyolefin cable material, which is suitable for producing soft cable products such as electronic wires and transmission lines, and belongs to the production method of cable material preparation methods craft field. Background technique [0002] Flame-retardant polyolefin cable materials have been widely used in wire and cable. Due to the excellent mechanical properties and processing properties of polyethylene itself, flame-retardant polyolefin cable materials have been widely used in the production of power cables. [0003] There are three main methods of polyethylene crosslinking: irradiation crosslinking, peroxide crosslinking and silane graft crosslinking. The cross-linked polyethylene produced by irradiation cross-linking has high purity and simple production process, b...

Claims

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Application Information

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IPC IPC(8): C08L51/06C08L23/00C08K13/06C08K9/04C08K3/22C08K3/38H01B7/295
Inventor 程金星侯海良翁文彪施冬梅怀宝祥
Owner 上海至正新材料有限公司
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