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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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AI Technical Summary

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 adopts twin-screw extrusion granulation, the dispersing effect of silane cross-linking agent and initiator is poor, and the thread is continuous, which exerts a great pressure on polyethylene, and the energy consumption of corresponding equipment also increases
In addition, the silane cross-linked low-smoke halogen-free flame-retardant cable materials in the prior art also have the disadvantages of poor flame retardant dispersion and environmental stress cracking resistance, and the flame retardancy and hand feel are not good from the perspective of commodities.
[0006] In summary, there is a lack of a silane-crosslinked halogen-free flame retardant that improves the environmental stress cracking resistance of the preparation method of polyolefin cable materials, the dispersion of flame retardants, and is suitable for the production of flexible cables such as electronic wires and transmission lines. Polyolefin cable compound

Method used

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

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preparation example Construction

[0058] It 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 is prepared by two-step silane crosslinking technology. The silane-crosslinked halogen-free flame-retardant The preparation method of polyolefin cable material consists of flame retardant graft A material and catalytic masterbatch B material. Most preferably, the preparation of the flame-retardant graft A material includes the following steps: firstly prepare the silane-grafted polyolefin resin; use the silane-grafted polyolefin resin as raw material, mix it with modified flame retardants, processing aids, etc. The high-precision feeding weight loss system enters the reciprocating single-screw extrusion granulation unit, kneads, shears, and extrudes at 100-150°C, and then granulates with spray granulation. After cooling, centrifugal dehydration, Boiling drying, automatic pa...

Embodiment approach

[0130] A method for preparing a silane-crosslinked halogen-free flame-retardant polyolefin cable material, comprising the steps of:

[0131] (1) Preparation of silane-grafted polyolefin: grafting silane onto polyolefin resin to obtain silane-grafted polyolefin;

[0132] (2) Use silane-grafted polyolefin as raw material, mix it with flame retardants, processing aids, etc. according to the ratio, and enter the reciprocating single-screw extrusion granulation unit through the high-precision K-TRON feeding weight loss system. Mixing, shearing and extrusion at -150°C, and then granulation by spray granulation, cooling, centrifugal dehydration, boiling drying, and automatic packaging by an 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, transporting to the twin-screw, mixing and granulating at 140-190°C to obtain material B pellets;

[0134] (4) Dispers...

Embodiment 1

[0163] This example 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, wherein:

[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 melt index of the low-density polyethylene resin is 2±0.5g / 10min, produced by Sinopec.

[0166] The silane was Degussa's VTMO.

[0167] The initiator is DCP from Aksu.

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

[0169] Antioxidant is Irganox1010 type antioxidant produced by Swiss Ciba Company.

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

[0171] The catalyst is dib...

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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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