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Mother stock of polyvinyl carbon nanotube anti-static composite material and anti-static composite material based on mother stock

A carbon nanotube and composite material technology, applied in the field of antistatic composite material masterbatch and antistatic composite material, can solve the problems of damaging the mechanical properties and processing flow properties of toughened polypropylene, and it is difficult to ensure polyethylene, etc., and achieve good The effect of antistatic properties and comprehensive mechanical properties

Inactive Publication Date: 2007-03-07
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dynamic vulcanization technology often encounters difficulties in the application of plastic toughening, especially the toughening of EPDM rubber to polyethylene, mainly because the crosslinking agent will act on both EPDM rubber and polypropylene. , and the amount of polyethylene is much more than that of EPDM, it is difficult to ensure that polyethylene is not affected by crosslinking agents, and the continuous phase polyethylene is crosslinked or degraded, which will seriously damage the mechanical properties of toughened polypropylene. Properties and processing flow properties
[0007] Existing studies have shown that the toughness of polyethylene / carbon nanotube composites can be greatly improved by adding EPDM or other elastomers (such as SEBS) or graft-modified elastomers (such as MA-SEBS), but both Composite strength must be sacrificed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. Surface modification of carbon nanotubes (CNTs)

[0046] (1) Nitric acid oxidation treatment

[0047] The raw CNTs were placed in an oven at 100°C and dried for 120 minutes. The dried CNTs and nitric acid with a concentration of 3.0 mol / L were mixed at a mass ratio of 1:3, heated to reflux under the action of a stirrer, the treatment temperature was 120°C, and the treatment time was 10 hours. Take out the treated matter, wash it repeatedly with distilled water until pH=7, and put it into an oven at 100°C for drying.

[0048] (2) Ball milling treatment

[0049] First configure the coupling agent into a 10wt% ethanol solution, and add acetic acid dropwise to adjust the pH value of the solution to 3.5-5.5.

[0050] Mix the CNTs obtained in (1) with the above-mentioned coupling agent-ethanol solution at a mass ratio of 1:4, and put the obtained slurry into a planetary ball mill for ball milling for 10 minutes at a speed of 400 r / min. Finally, the obtained CNTs are fu...

Embodiment 2

[0080] As implementing the preparation method described in Lee 1, process parameter changes as follows:

[0081] 1. Surface modification of carbon nanotubes (CNTs)

[0082] Nitric acid concentration: 4mol / L

[0083] Acid treatment temperature: 100°C

[0084] Acid treatment time: 18h

[0085] Ball milling time: 20min

[0086] Ball mill speed: 300r / min

[0087] 2. Solution blending

[0088] Formula ratio - polyethylene: CNTs: compatibilizer: coupling agent: BHT=100:25:20:8:0.02

[0089] Compatibilizer: MAH-g-PE, graft ratio 1.2%

[0090] Coupling agent: Vinyltrimethoxysilane

[0091]3. Melt blending

[0092] Formulation ratio—mixture: EPDM: crosslinking agent: co-crosslinking agent = 100:60:0.08:0.6

[0093] Cross-linking agent: DCP

[0094] Auxiliary cross-linking agent: DAP

[0095] PE: Masterbatch = 100:15

Embodiment 3

[0097] As implementing the preparation method described in Lee 1, process parameter changes as follows:

[0098] 1. Surface modification of carbon nanotubes (CNTs)

[0099] Nitric acid concentration: 2mol / L

[0100] Acid treatment temperature: 140°C

[0101] Acid treatment time: 24h

[0102] Ball milling time: 5min

[0103] Ball mill speed: 400r / min

[0104] 2. Solution blending

[0105] Formula ratio - polyethylene: CNTs: compatibilizer: coupling agent: BHT = 100:8:25:4:0.08

[0106] Compatibilizer: MAH-g-PE, grafting rate 1%

[0107] Coupling agent: Vinyltrimethoxysilane

[0108] 3. Melt blending

[0109] Formulation ratio - mixture: EPDM: crosslinking agent: co-crosslinking agent = 100:45:0.04:0.2

[0110] Cross-linking agent: DIP

[0111] Auxiliary cross-linking agent: GM

[0112] PE: Masterbatch = 100:20

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Abstract

The invention relates to an anti-static modified material with carbon nanotubes (CNTs) predominantly and a process which is a thermal oxidation treatment with acid together with a ball grinding surface treatment to CNTs and comprises: adding maleic anhydride grafted polyethylene, coupling agents and EPT rubber to prepare the high concentration masterbatch of CNTs / PE anti-static composite material by solution blending and melt blending methods, mixturing the said masterbatch with common PE in a finite proportion to melt blend and prill, then getting the final CNTs / PE anti-static composite material. The electrical surface resistivity and volume resistivity can reach the operating requirements of the anti-static material when the content of CNTs is only 0.3 wt % in the CNTs / PE anti-static composite material in the invention.

Description

technical field [0001] The present invention relates to an antistatic composite material masterbatch and an antistatic composite material based on the masterbatch, specifically, polyethylene with carbon nanotubes (CNTs) as the main antistatic modification material and polyethylene as the main modification object Carbon nanotube based antistatic composite material and its masterbatch. Background technique [0002] Due to its low price, excellent performance, and easy processing, polyethylene has been widely used in various fields such as packaging, daily necessities, chemicals, automobiles, and medical treatment, and has become one of the most widely used plastics. For example, polyethylene has excellent electrical properties, which makes it widely used in electrical insulation materials, but it is precisely because of its electrical insulation that it has defects in chemical pipelines, containers, films, etc. It is easy to generate static charge when rubbing or peeling off ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08K9/00C08K3/04
Inventor 钱琦吴唯黄祖雄刘敏
Owner EAST CHINA UNIV OF SCI & TECH
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