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Low-smoke zero-halogen flame-retardant silane crosslinking polyolefin and preparation method thereof

A silane cross-linking and polyolefin technology, which is applied in the field of polymer materials, can solve the problems that the materials cannot be extruded smoothly, cannot be successfully realized, and the fluidity of the matrix resin is poor, so as to achieve the effect of improving the interfacial bonding ability

Active Publication Date: 2013-07-17
JIANGSU ZHONGLI GRP CO LTD +2
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently widely used low-smoke and halogen-free flame retardant systems all have the problem that the amount of flame retardant added is large, and it is difficult to take into account the comprehensive mechanical properties of the cable.
[0004] Although some patents mention the technology of simply adding flame retardants to the silane-grafted polymer A / polymer B material formula to achieve flame retardancy, the material basically cannot be processed smoothly due to the poor fluidity of the matrix resin. Extrusion, so that none of these technologies can be successfully implemented in actual production
At present, there is no mature silane cross-linked polyethylene with low-smoke, halogen-free and flame-retardant functions in the market.

Method used

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  • Low-smoke zero-halogen flame-retardant silane crosslinking polyolefin and preparation method thereof

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preparation example Construction

[0026] The present invention also provides a method for preparing the above-mentioned low-smoke, halogen-free and flame-retardant silane crosslinked polyolefin, comprising the following steps:

[0027] (1) Preparation of silane-grafted polyolefin: melt-blending polyolefin resin, crosslinking initiator and unsaturated silane to obtain silane-grafted polyolefin;

[0028] (2) Preparation of catalyst masterbatch: polyolefin resin and catalyst are melt-blended to obtain catalyst masterbatch;

[0029] (3) Preparation of flame retardant masterbatch: melt blending thermoplastic elastomer and flame retardant to obtain flame retardant masterbatch;

[0030] (4) melt-blending the silane-grafted polyolefin prepared in steps (1)-(3), the catalyst masterbatch and the flame retardant masterbatch to obtain a low-smoke, halogen-free, flame-retardant silane crosslinked polyolefin;

[0031] Among them, the raw materials and their weight proportions are: 18-49 parts of polyolefin resin, 5-40 part...

Embodiment 1

[0035] Raw materials and their proportions:

[0036] 49 parts of linear low-density polyethylene, 23.2 parts of ethylene-butylene copolymer, flame retardant (a mixture of polyphosphate amine, melamine, pentaerythritol, and montmorillonite, wherein the weight ratio of polyphosphate amine, melamine, pentaerythritol, and montmorillonite 3:1:1:1) 25 parts, vinyltrimethoxysilane 1.35 parts, dicumyl peroxide 0.45 parts, dibutyltin dilaurate 1 part.

[0037] Preparation:

[0038] (1) Preparation of silane-grafted polyethylene: Mix linear low-density polyethylene (1.59 parts), dicumyl peroxide and vinyltrimethoxysilane, and blend and extrude in an extruder to obtain silane-grafted polyethylene For polyethylene blends, the temperature of each section of the extruder is 130°C, 160°C, 170°C, 180°C, and the speed is set at 55rpm;

[0039] (2) Preparation of catalyst masterbatch: mix linear low-density polyethylene (47.41 parts) with dibutyltin dilaurate according to the above ratio, and...

Embodiment 2

[0044] Raw materials and proportioning: 18 parts of low-density polyethylene, 8 parts of butadiene copolymer, 72 parts of aluminum hydroxide, 0.045 parts of vinyltriethoxysilane, 0.019 parts of benzoyl peroxide, and 0.05 parts of stannous octoate.

[0045] The specific preparation method is the same as in Example 1, and the total ratio of silane-grafted polyolefin to catalyst masterbatch is 9:1. The performance indicators of the obtained products are shown in Table 1.

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Abstract

The invention belongs to the technical field of high polymer materials and particularly relates to low-smoke zero-halogen flame-retardant silane crosslinking polyolefin and a preparation method thereof. The low-smoke zero-halogen flame-retardant silane crosslinking polyolefin comprises, by weight, 18-40 parts of polyolefin resin, 5-40 parts of thermoplastic elastomer, 25-72 parts of flame retardancy, 0.045-1.35 parts of unsaturated silicone, 0.019-0.45 part of crosslinking initiator and 0.05-1 part of catalyst. Low-smoke zero-halogen flame-retardant silane crosslinking polyolefin cable insulation materials having better processing performance can be obtained and can be disposed for crosslinking in long run at the room temperature, and crosslinking can be accelerated by warm water. Surfaces of insulation layers of obtained cables are flat and smooth, and requirements of GB / T17650.2 and GB / T18380 standard are met.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a low-smoke, halogen-free, flame-retardant silane crosslinked polyolefin and a preparation method thereof. Background technique [0002] The silane cross-linking method has obvious investment advantages in various manufacturing methods of cross-linked polyethylene cable materials. Therefore, in recent years, this technology has been widely valued in my country's cable industry and has also achieved rapid development. However, during the preparation of silane crosslinked polyethylene, due to the introduction of silane and the formation of grafted and crosslinked structures in the system, the melt fluidity of the material is often poor during processing. If a small amount of filler is added to it, it will not be able to be extruded smoothly. out, and the resulting product has problems such as poor surface properties. [0003] In addition, with the improvemen...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L31/04C08L23/16C08L9/00C08L51/06C08L23/06C08L23/12C08K13/02C08K5/5425C08K3/22C08K3/32C08K5/3492C08K5/053C08K3/34C08K5/14C08J3/24C08J3/22C08F255/02
Inventor 王孝军杨杰杨其张尔梅钱俊张兴飞苏桂明管文武邵海滨卫晓明
Owner JIANGSU ZHONGLI GRP CO LTD
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