Preparation method of halogen-free low-smoke flame-retardant crosslinked polyethylene composite material

A cross-linked polyethylene, low-smoke flame-retardant technology, applied in the field of polymer materials, can solve the problems of biomass waste without good application prospects, soil, water and air pollution, and achieve excellent flame-retardant and mechanical properties , Improve the effect of environmental pollution

Active Publication Date: 2014-09-03
NORTHWEST NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two types of flame retardants available in polyethylene: halogen flame retardants and non-halogen flame retardants. However, due to the limited application of halogen-containing flame retardants, the current market development trend is mainly to use environmentally friendly halogen-free smoke suppression fuel
[0005] Potato waste residue activated carbon sludge is biomass activated carbon prepared from potato waste residue, a by-product of potato starch processing enterprises (see Chinese patent application, publication number CN103318888A for details). It is used as a sewage treatment agent and discarded solid sludge. Pile up in large quantities on the soil, Water sources and air have caused serious pollution, but the biomass waste has not yet found a good application prospect

Method used

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  • Preparation method of halogen-free low-smoke flame-retardant crosslinked polyethylene composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 100 kg of low-density polyethylene, 20 kg of flame retardant (12.5 kg of activated carbon sludge from potato residue, 6.25 kg of dimethyl methylphosphonate, and 1.25 kg of palygorskite clay), vinyl trimethoxyl crosslinking agent Silane 1 kg, antioxidant dicumyl peroxide 500 g, lubricant dibutyltin dilaurate 250 g, high-speed stirring (stirring speed 650 rpm) and kneading for 20-40 minutes, then twin-screw extrusion at 140-170 ° C Composite granules are obtained by machine extrusion, and then the composite granules are cross-linked in water at 50-80°C for 0.5-1 hour, and the obtained product is air-dried.

[0021] Product performance: the oxygen index is 29; the smoke density is 102 under flameless conditions, the tensile strength is 15.3MPa, and the elongation at break is 702%. Specifications for mechanical properties.

Embodiment 2

[0023] Weigh 100 kg of low-density polyethylene, 45 kg of flame retardant (15 kg of potato waste activated carbon sludge, 15 kg of dimethyl methylphosphonate, and 15 kg of palygorskite clay), cross-linking agent vinyltrimethoxysilane 4.5 kg, antioxidant dicumyl peroxide 2.5 kg, lubricant dibutyltin dilaurate 2kg, high-speed stirring (stirring speed 1200 rpm) after kneading for 20-40 minutes, extruded by twin-screw extruder at 140-170°C Composite particles are obtained, and then the composite particles are cross-linked in water at 50-80° C. for 0.5-1 hour, and the obtained product is air-dried.

[0024] Product performance: the oxygen index is 38; the smoke density is 75 under flameless conditions, the tensile strength is 14.2 MPa, and the elongation at break is 688%. All properties meet the industry standard YD / T 1113-2001 on the mechanical properties of wire and cable sheathing materials Provisions.

Embodiment 3

[0026] Weigh 100 kg of low-density polyethylene, 27 kg of flame retardant (15 kg of activated carbon sludge from potato residue, 9 kg of dimethyl methylphosphonate, and 3 kg of palygorskite clay), cross-linking agent vinyl trimethoxy Silane 3 kg, antioxidant dicumyl peroxide 2 kg, lubricant dibutyltin dilaurate 1.5 kg, high-speed stirring (stirring speed 1000 rpm) after kneading for 20-40 minutes, twin-screw extrusion at 140-170 ° C Composite granules are obtained by machine extrusion, and then the composite granules are cross-linked in water at 50-80°C for 0.5-1 hour, and the obtained product is air-dried.

[0027] Product performance: the oxygen index is 32; the smoke density is 98 under flameless conditions, the tensile strength is 15.0 MPa, and the elongation at break is 691%. All properties meet the industry standard YD / T 1113-2001 on the mechanical properties of wire and cable sheathing materials Provisions.

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Abstract

The invention relates to a preparation method of a halogen-free low-smoke flame-retardant crosslinked polyethylene composite material. The preparation method comprises the following steps: by taking low-density polyethylene as a base material, a mixture compounded by potato residue activated carbon sludge, dimethyl methylphosphorate and polygorskite clay as a compound flame retardant, vinyl tri-methoxysilane as a crosslinking agent, dicumyl peroxide as an antioxidant, and dibutyltin dilaurate as a lubricant, stirring and kneading at high speed, and extruding through a double-screw extruder to obtain composite granules; then conducting crosslinking to the composite granules in water, and airing to obtain the composite material product. Through determination, the limit oxygen index of the prepared composite material is 29-38, the density of smoke is 75-102 under smokeless conditions, the tensile strength is more than 14.2MPa, the elongation at break is more than 688%, and all performances of the material can meet the regulation of industry standard YD / T1113-2001 on the mechanical properties of cable and cord sheathing materials.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to the preparation of a cross-linked polyethylene composite material, in particular to the preparation of a halogen-free, low-smoke, flame-retardant cross-linked polyethylene composite material. Background technique [0002] In recent decades, plastics, rubber, synthetic fibers and other polymer materials and their products have been vigorously developed. They are rapidly replacing traditional steel, metal products, cement and natural polymers such as wood and cotton, and are widely used in industries. , agriculture, military and other sectors of the national economy. [0003] Polyethylene is one of the most commonly used plastics, and its output and consumption rank first among all kinds of synthetic resins. With the development of the times, people's requirements for its performance are also constantly improving. Since the high temperature resistance, mechanical properties and che...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K13/02C08K3/04C08K5/5333C08K3/34C08K5/5425C08K5/14C08K5/57C08J3/24
CPCC08J3/24C08J2323/06C08K3/04C08K3/346C08K5/14C08K5/5333C08K5/5425C08K5/57C08K13/02C08L2201/02C08L2201/22C08L2203/202C08L2207/066C08L2312/08C08L23/06
Inventor 雷自强武广瑞张哲魏博蔡文婧杨谦罗鑫圣周鹏鑫
Owner NORTHWEST NORMAL UNIVERSITY
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