Modified coal gangue powder filled polyolefin flame-retardant composite material and preparation process

A technology of flame retardant composite material and coal gangue powder, which is applied in the field of coal gangue modified and filled polyolefin flame retardant composite material and its preparation, can solve the problem of reducing the mechanical properties of polyolefin materials, decreasing the filling amount of coal gangue powder, and increasing the preparation cost, etc. problem, to achieve the effects of excellent flame retardant properties and thermal stability, improved flow processability, and improved elastic modulus

Active Publication Date: 2019-12-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional flame retardant fillers are considered to be pollution-free flame retardants such as: aluminum hydroxide or magnesium hydroxide, but such flame retardants need to be added in large quantities to obtain better flame retardant properties and need to be supplemented with flame retardant synergists, It will greatly reduce the mechanical properties of polyolefin materials and increase the preparation cost. In addition, this type of flame-retardant filler will greatly reduce the filling amount of coal gangue powder, so this problem also needs to be solved urgently

Method used

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  • Modified coal gangue powder filled polyolefin flame-retardant composite material and preparation process

Examples

Experimental program
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Effect test

Embodiment 1

[0025] At room temperature, dry the gangue powder at 110-120°C until the water content is <0.1%, and add HDCP and dried gangue powder into the high-speed mixer at a weight ratio of 1:100 at a speed of 1000r / min. Mix for 10 minutes to obtain modified gangue powder. Fill the modified coal gangue powder and polyolefin into the twin-screw extruder according to the weight ratio of 30:100. The main screw speed is 140rpm, the pump speed is 10rpm, and the temperature is 190-200°C. After melt blending and extrusion, cool Use a granulator to cut pellets, fill the pellets into the injection molding machine, the injection molding temperature is 190°C, the injection molding pressure is 40MPa, and the injection extrusion can prepare modified coal gangue powder filled polyolefin flame-retardant composite products, and its elastic modulus is improved. 20%, the strength can be increased by 10%, the toughness can be enhanced by 20%, the heat distortion temperature is 260°C, and the limiting oxy...

Embodiment 2

[0027]At room temperature, dry the gangue powder at 110-120°C until the water content is <0.1%, and add HDCP and dried gangue powder into the high-speed mixer at a weight ratio of 10:100 at a speed of 1300r / min. Mix for 20 minutes to obtain modified gangue powder. Fill the modified coal gangue powder and polyolefin into the twin-screw extruder at a weight ratio of 30:100, the main screw speed is 120rpm, the pump speed is 9rpm, and the temperature is 220-240°C. After melt blending and extrusion, cool Cut pellets with a granulator, fill the pellets into the injection molding machine, the injection molding temperature is 230°C, the injection molding pressure is 60MPa, and the injection extrusion can prepare modified coal gangue powder filled polyolefin flame-retardant composite products, and its elastic modulus is improved. 35%, the strength can be increased by 28%, the toughness can be enhanced by 45%, the heat distortion temperature is 280°C, and the limiting oxygen index is 33...

Embodiment 3

[0029] At room temperature, dry the gangue powder at 110-120°C until the water content is <0.1%, and add HDCP and dried gangue powder into the high-speed mixer at a weight ratio of 8:100 at a speed of 1200r / min, at a high speed Mix for 15 minutes to obtain modified gangue powder. Fill the modified coal gangue powder and polyolefin into the twin-screw extruder at a weight ratio of 30:100. The main screw speed is 100 rpm, the pump speed is 8 rpm, and the temperature is 210-220 ° C. After melt blending and extrusion, cool Use a granulator to cut pellets, fill the pellets into the injection molding machine, the injection molding temperature is 210°C, the injection molding pressure is 50MPa, and the injection extrusion can prepare modified coal gangue powder filled polyolefin flame-retardant composite products, and its elastic modulus is improved. 40%, the strength can be increased by 35%, the toughness can be enhanced by 55%, the heat distortion temperature is 290°C, and the limit...

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Abstract

The invention discloses a modified coal gangue powder filled polyolefin flame-retardant composite material and a preparation process, and belongs to the technical field of polyolefin flame-retardant composite material preparation. The weight ratio of the modified coal gangue powder to the polyolefin in the composite material is (10-60):100, and the modified coal gangue powder contains a cyclotriphosphazene derivative, which has a novel structure and can be used as a surface modifier and a flame retardant. The coal gangue powder modified by cyclotriphosphazene is easy to disperse uniformly in apolyolefin matrix, wherein the interface bonding force between the coal gangue powder and the polyolefin matrix can be enhanced, so that the mechanical properties of the composite material are remarkably improved, and the composite material has a relatively good flame-retardant property. The novel composite material has the advantages of high coal gangue filling amount, low polyolefin consumption, no need of calcining the coal gangue powder, energy saving and low cost. The composite material has the advantages of excellent comprehensive mechanical properties, obvious flame retardancy, simplepreparation technique, no use of strong acids or alkalis in the preparation process, and no environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of preparation of polyolefin flame-retardant composite materials, and in particular relates to a coal gangue-modified filled polyolefin flame-retardant composite material and a preparation process. Background technique [0002] Polyolefins are a class of materials with a wide range of applications and excellent performance, and are widely used in home appliances, automobiles, and machinery manufacturing. However, with the rapid development of various fields, general-purpose polyolefin materials can no longer meet the growing demand for performance, and polyolefin is a synthetic resin made from petroleum, and petroleum is a non-renewable one-time natural resource. Due to the consumption of resources and the soaring price, the price of polyolefin materials has remained high, so the modification of polyolefin filling can not only effectively improve the overall performance of polyolefin materials, but also effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/02C08K9/04C08K3/36C08K3/22C08K5/5399
CPCC08K9/04C08K3/36C08K3/22C08K5/5399C08K2003/2227C08L2201/02C08L2201/08C08L23/02
Inventor 索红莉武鑫宇张腾周宇琦纪耀堂裴俊峰马麟刘敏
Owner BEIJING UNIV OF TECH
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