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A kind of preparation method of antistatic polypropylene foam beads

A technology for foaming beads and polypropylene, applied in the field of polymers, can solve problems such as affecting conductivity, poor dispersibility, affecting carbon nanotubes, etc.

Active Publication Date: 2018-01-23
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent 200710192215.8 reports the preparation method of antistatic and conductive polypropylene, and the surface intrinsic resistivity of the obtained polypropylene sheet is 10 10 -10 11 Ω·cm, the addition amount of carbon black is 5-40%, due to the low apparent density of carbon black, the addition amount is relatively large, it is difficult to blend with polypropylene base resin, which increases the complexity of the process and product cost
In recent years, there have been many reports on the use of carbon nanotubes or graphene as antistatic fillers, but their wide application has been affected due to the problems of dispersion and interfacial bonding.
For example, carbon nanotubes have high specific surface energy, are easy to agglomerate, and have poor dispersion. In addition, their surface is complete and smooth, with few dangling bonds, and poor wettability with other substances. They are almost insoluble in any solvent and easy to aggregate in solution. These aspects greatly affect the dispersion of carbon nanotubes and thus affect their conductivity

Method used

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  • A kind of preparation method of antistatic polypropylene foam beads
  • A kind of preparation method of antistatic polypropylene foam beads
  • A kind of preparation method of antistatic polypropylene foam beads

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preparation example Construction

[0046] Preparation of matrix resin HMSPP501

[0047] The polymerization reaction was carried out on a polypropylene pilot plant. Its main equipment includes prepolymerization reactor, first loop reactor and second loop reactor.

[0048] Pre-polymerization reaction: the main catalyst (DQ-III catalyst, provided by Beijing Aoda Branch of Sinopec Catalyst Company) with a flow rate of about 0.5g / hr, the co-catalyst (triethylaluminum) with a flow rate of 6.33g / hr, and a flow rate of 0.63 g / hr of the first external electron donor (dicyclopentyldimethoxysilane, DCPMS) was pre-contacted at 6°C for 20 minutes, and then continuously added to the continuous stirred tank prepolymerization reactor for prepolymerization reaction. Prepolymerization It is carried out under the environment of the propylene liquid phase body, the temperature is 15°C, and the residence time is about 4 minutes. Under these conditions, the prepolymerization ratio of the catalyst is about 120 to 150 times. The mol...

Embodiment 1～10

[0059] 1) Preparation of modified carbon nanotubes: Weigh 0.5g of carbon nanotubes (multi-walled carbon nanotubes, diameter 15-30nm), mix them with 125g of agate balls, place them in an agate ball mill, and place them in a planetary ball mill to express Ball mill at the rotational speed listed in 2 for a period of one hour to obtain dispersed carbon nanotubes. Weigh 5.0g of the dispersed carbon nanotubes obtained by the above-mentioned ball milling and add it into 500ml of nitric acid / hydrogen peroxide mixed solution (the concentration of nitric acid is 65wt%, the concentration of hydrogen peroxide is 45wt%, and the volume ratio H 2 o 2 : HNO 3 =1:3), the solution was magnetically stirred at room temperature for 30 minutes, and then subjected to 40 kHz ultrasonic treatment for 30 minutes, and then the solution was connected to the reflux reaction device, and refluxed and stirred at 120 ° C for 2 hours. The obtained product was suction-filtered with a 0.22-micron microporous ...

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Abstract

The invention provides a preparation method of antistatic polypropylene foam beads, comprising firstly obtaining polypropylene according to the following method, then using the obtained polypropylene as a matrix resin, adding carbon nanotubes as an antistatic agent, and using a physical foaming agent The polypropylene foamed beads are obtained by foaming; wherein, the preparation method of the polypropylene is: two or more stages of propylene polymerization are carried out in two or more reactors operated in series, and the two-stage reaction The external electron donors used are silane compounds and diether compounds respectively. The invention uses high-melt-strength polypropylene with wide molecular weight distribution as raw material and carbon nanotubes as antistatic agent to realize the stabilization of polypropylene raw material, effectively expand the foaming window, easy to adjust the process, and can prepare excellent performance Antistatic polypropylene foam beads are widely used in fields with high antistatic requirements, including aerospace, precision instruments, and electronic product packaging.

Description

technical field [0001] The invention relates to the field of macromolecules, in particular to a method for preparing antistatic polypropylene foam beads. Background technique [0002] Foamed materials mainly include foamed beads, foamed plates or sheets and other apparent forms; foamed plates or sheets are widely used in the fields of containers, building materials, auto parts and impact energy absorbing materials. [0003] Polypropylene foam material is a new type of material, which uses polypropylene as the basic component and contains a large number of air bubbles. It has good properties such as light weight, material saving, low thermal conductivity, good heat insulation performance, ability to absorb impact loads, excellent cushioning performance, good sound insulation performance, and high specific strength. However, PP foam materials have poor antistatic properties, which makes them have defects in the application of chemical pipelines and containers. It is easy to g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/12C08L23/12C08K9/00C08K7/00C08K3/04C08F10/06C08F4/646C08F4/649
Inventor 郭鹏徐耀辉吕明福张师军毕福勇张琦尹华
Owner CHINA PETROLEUM & CHEM CORP
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