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Halogen-free flame-retardant and anti-static polyethylene material, pipe and preparing method thereof

A flame retardant, antistatic, polyethylene technology, applied in the direction of pipes, rigid pipes, mechanical equipment, etc., can solve the problems of high modification cost, large amount of smoke, poor environmental protection, etc., achieve excellent comprehensive mechanical properties and reduce raw material costs. , the effect of increasing compatibility

Active Publication Date: 2010-06-30
SICHUAN JIANNANCHUN GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] ①Brominated flame retardant system (polybrominated diphenyl ether) is used, which produces a large amount of smoke when burned, produces a large amount of corrosive gas and toxic gas, and has poor environmental protection
[0014] ②The modification cost of this system is generally high. Based on the HDPE price of 10,000 yuan / ton, the raw material cost of this system is 12,500 yuan / ton, which is significantly higher than that of conventional HDPE pipes;
[0015] ③ The toughness of the system is poor
Taking high-density polyethylene as an example, when 30% EG is added, the elongation at break of the system is only 12%, which is far from meeting the requirements of pipe properties
At the same time, it is difficult to further effectively improve the flame retardant performance of the material.

Method used

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  • Halogen-free flame-retardant and anti-static polyethylene material, pipe and preparing method thereof
  • Halogen-free flame-retardant and anti-static polyethylene material, pipe and preparing method thereof
  • Halogen-free flame-retardant and anti-static polyethylene material, pipe and preparing method thereof

Examples

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preparation example Construction

[0071] The preparation process of the halogen-free flame-retardant antistatic polyethylene pipe is as follows: extrude the halogen-free flame-retardant antistatic polyethylene material in a pipe extruder at 160-200°C. The prepared halogen-free flame-retardant antistatic polyethylene pipe has high flame-retardant efficiency, and can effectively flame-retardant PE when the amount of flame retardant and synergistic flame retardant is small; at the same time, it can reduce the use of expensive conductive carbon black, When the content of conductive carbon black is 3%, it can meet the requirements of antistatic performance in MT 181-88 "Specification for Testing the Safety Performance of Plastic Pipes Used in Underground Coal Mine"; the comprehensive mechanical properties of the material are excellent.

[0072] Although EG modification can improve the flame retardancy and antistatic properties of the material at the same time, after EG is added to PE, the mechanical properties of th...

Embodiment 1

[0088] Example 1 Preparation of halogenated flame retardant antistatic polyethylene pipe of the present invention

[0089] After drying 1 part of high-density polyethylene in an oven at 80°C for 4 hours, and 99 parts of expandable graphite with a particle size of 10 mesh, add it to a high-speed mixer and mix evenly, and grind it in a mechanochemical reactor for 10 times to obtain the average particle size It is 1000 mesh EG / PE ultrafine composite powder.

[0090] After drying 80 parts of PE100 high-density polyethylene in an oven at 80°C for 2 hours, add 20 parts of ultrafine composite powder, 1 part of APP, and 3 parts of conductive carbon black into a high-speed mixer and mix evenly. Melt blending extrusion, granulation, and drying to obtain a halogen-free flame-retardant antistatic polyethylene material. The tensile strength of the material is 22MPa, the notched impact strength is 20kJ / m2, the elongation at break is 350%, and the oxygen index is 30. , UL-94 reaches V0 leve...

Embodiment 2

[0092] Example 2 Preparation of halogen-free flame-retardant antistatic polyethylene pipe of the present invention

[0093] Dry 50 parts of low-density polyethylene in an oven at 80°C for 4 hours, add 50 parts of expandable graphite with a particle size of 200 mesh, mix them evenly in a high-speed mixer, and grind 30 times in a mechanochemical reactor to obtain the average particle size It is 3000 mesh EG / PE ultrafine composite powder.

[0094] After drying 90 parts of PE80 grade medium density polyethylene in an oven at 80°C for 2 hours, add 10 parts of ultrafine composite powder, 10 parts of red phosphorus, 10 parts of PER, and 4 parts of conductive carbon black into a high-speed mixer and mix evenly. Melt blending, extrusion, granulation and drying at a temperature of 180°C to obtain a halogen-free flame-retardant antistatic polyethylene material with a tensile strength of 18MPa, a notched impact strength of 18kJ / m2 and an elongation at break of 400%. , the oxygen index is...

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Abstract

A halogen-free flame-retardant and anti-static polyethylene material, a pipe and a preparing method thereof belong to the processing field of plastic pipes. The present invention aims to provide a halogen-free flame-retardant and anti-static polyethylene material and a pipe prepared from the material. The halogen-free flame-retardant and anti-static polyethylene material is prepared from 70 to 99 shares of polyethylene, 1 to 30 shares of expanded graphite (EG) / polyethylene (PE) superfine composite powder, 1 to 30 shares of synergistic flame retardant and 1 to 5 shares of conductive black by the steps of melting and blending at a temperature of 160 DEG C to 200 DEG C, extruding, granulating and drying. The EG / PE superfine composite powder is made by simultaneously grinding PE and EG with a millstone type mechanochemical reactor, and the granularity of the powder is 1000 meshes. The halogen-free flame-retardant and anti-static polyethylene pipe made from the halogen-free flame-retardant and anti-static polyethylene material prepared according to the present invention has the characteristics of halogen-free flame retardation, high flame-retardant efficiency and excellent comprehensive mechanical properties. Besides, the raw material cost of the halogen-free flame-retardant and anti-static polyethylene pipe can be largely reduced, and the pipe is simply processed and conveniently made.

Description

technical field [0001] The invention relates to a halogen-free flame-retardant and antistatic polyethylene material, a halogen-free flame-retardant and antistatic polyethylene pipe prepared by using the material and a preparation method thereof, belonging to the field of plastic pipe processing. Background technique [0002] Polyethylene pipes are more and more widely used in mines because of their light weight, corrosion resistance, aging resistance, and easy installation. They are mainly used in mines for air pressure, drainage, ventilation, slurry pumping, and gas discharge. The static electricity accumulated on the plastic pipes is very harmful to the mine. Take the gas pumping pipe as an example. During the pumping process, the material flowing in the pipe is mainly the main body of gas, but it is mixed with a certain amount of dust. , when flowing at a certain speed in the plastic pipe, the gas and solid dust will frequently rub and collide with the pipe wall, thereby ...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K3/04F16L9/12
Inventor 白时兵徐占成王琪李治
Owner SICHUAN JIANNANCHUN GRP CO LTD
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