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Smokeless non-halogen retardant polyolefine preparing method

A polyolefin and polyolefin resin technology, applied in the field of polymer composite materials in chemical materials, can solve the problems of low tensile strength, reduced tensile strength, damage to the mechanical properties of materials, etc., and achieve high elongation at break and low smoke characteristics. The effect of excellent, good mechanical properties

Inactive Publication Date: 2005-02-02
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the cable material prepared by this method is complicated, and the flame retardant synergist, the use of surface-treated metal hydroxide and the complex base material composition inevitably greatly increase the economic cost.
[0005] The methods disclosed in the above patents mainly have two disadvantages: one is that the low-smoke halogen-free flame-retardant polyolefin material is a material filled with a large amount of metal hydroxide, and these inorganic fillers are treated with a small amount of small molecule coupling agent. It is difficult to achieve uniform treatment, that is, it is difficult to uniformly cover the surface of the inorganic filler with the small molecule coupling agent, which makes the premature stress cracking of the material usually inevitable during use
It is also impractical to add a large amount of small molecule coupling agent. On the one hand, it is extremely uneconomical, and on the other hand, it will damage the mechanical properties of the material, such as the tensile strength will be greatly reduced.
Second, low-smoke, halogen-free, flame-retardant polyolefin materials are generally filled with aluminum hydroxide, magnesium hydroxide or their mixtures. Halogenated flame retardant polyolefin materials have relatively low tensile strength while maintaining a suitable elongation at break

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The polymer grafts with reactive functional groups are prepared first. The density of weighing 99 parts is 0.918g / cm 3 , linear low density polyethylene with a melt index of 2.0g / 10min (190°C, 2.16kg), 0.5 parts of vinyl-tris(2-methoxyethoxy) silane, 0.5 parts of dicumyl peroxide and peroxide A mixture of benzoyl peroxide, wherein the weight ratio of dicumyl peroxide to benzoyl peroxide is 4:1. The raw materials according to the above proportions are uniformly mixed in a high-speed mixer for 10 minutes without heating during the mixing process, and then extruded, drawn, cooled and granulated on an ordinary twin-screw extruder. The temperature range of the extruder is set; the barrel is between 110°C and 200°C, and the head and die are between 210°C and 220°C.

[0024] Take by weighing 30 parts of reactive polymer grafts, 70 parts of ethylene vinyl acetate with VA content of 28%, 140 parts of unmodified aluminum hydroxide (average particle diameter 1.3 μm), silicon dio...

Embodiment 2

[0026] The polymer grafts with reactive functional groups are prepared first. Weigh 92.5 parts of ethylene vinyl acetate copolymer with a melt index of 0.65g / 10min (190°C, 2.16kg), 5 parts of vinyl-tris(2-methoxyethoxy)silane, 2.5 parts of peroxide A mixture of dicumyl peroxide and benzoyl peroxide, wherein the weight ratio of dicumyl peroxide to benzoyl peroxide is 4:1. The raw materials according to the above proportions are uniformly mixed in a high-speed mixer for 10 minutes without heating during the mixing process, and then extruded, drawn, cooled and granulated on an ordinary twin-screw extruder. The temperature range setting of the extruder: the barrel is between 110°C and 200°C, and the head and die are between 210°C and 220°C.

[0027] Take by weighing 50 parts of reactive polymer grafts, 50 parts of ethylene vinyl acetate with VA content of 28%, 160 parts of unmodified aluminum hydroxide (average particle diameter 1.3 μm), silicon dioxide (average particle diameter...

Embodiment 3

[0029]The polymer grafts with reactive functional groups are prepared first. Weigh 85 parts of polypropylene with a melt index of 3.0g / 10min (190°C, 2.16kg), 10 parts of vinyl-tris(2-methoxyethoxy)silane, 5 parts of dicumyl peroxide and A mixture of benzoyl peroxide, wherein the weight ratio of dicumyl peroxide to benzoyl peroxide is 4:1. The raw materials according to the above proportions are uniformly mixed in a high-speed mixer for 10 minutes without heating during the mixing process, and then extruded, drawn, cooled and granulated on an ordinary twin-screw extruder. The temperature range setting of the extruder: the barrel is between 110°C and 200°C, and the head and die are between 210°C and 220°C.

[0030] Take by weighing 70 parts of reactive polymer grafts, 30 parts of ethylene vinyl acetate with VA content of 28%, 170 parts of unmodified aluminum hydroxide (average particle diameter 1.3 μm), silicon dioxide (average particle diameter 20nm) ) 5 parts, 15 parts of PP...

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PUM

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Abstract

A process for preparing low-smoke non-halogen flame-retarding polyolefin material includes such steps as grafting polyolefine to obtain high-molecular grafted polymer, mixing it with thermoplastic polyolefin resin, and proportionally mixing to metallic hydroxide, nanoparticles and high-molecular wax. Its advantages are high tension stregth and elongation at break, better flame-reatarding and low-smoke nature, and no contents of halogen, heavy metals and toxic components.

Description

Technical field: [0001] The invention relates to a preparation method of a low-smoke, halogen-free, flame-retardant polyolefin material. A certain polyolefin is grafted with reactive functional groups in a certain concentration range, and then oxidized with the same or other types of polyolefins and metal hydroxides. Polyolefin materials, polymer wax, and nano particles are compounded and processed to make polyolefin materials that meet environmental protection requirements, which belongs to the field of polymer composite materials in chemical materials. Background technique: [0002] In the prior art, the production method of the familiar halogen-free flame-retardant polyolefin material is to couple polyolefin resin with metal hydroxide, small molecule coupling agent (such as fatty acid or fatty acid salt, titanate coupling agent, aluminate coupling agent, silane coupling agent, etc.), or the metal hydroxide is first treated with a small molecule coupling agent and then com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C47/40C08K3/20C08L23/00C08L51/00
Inventor 江平开韦平汪根林王宗光
Owner SHANGHAI JIAOTONG UNIV