Method for preparing polypropylene/expanded graphite composite by water-assisted melting and mixing extrusion and application of method

A technology for melting, kneading and expanding graphite, applied in the field of polymer material/expanded graphite composite material and its preparation, can solve the problems of difficult industrialized production, long cycle, complex preparation process of composite material, etc., and achieves easy control and low production cost. , the effect of easy promotion

Active Publication Date: 2018-08-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These pretreatment methods make the preparation process of composite materials compl

Method used

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  • Method for preparing polypropylene/expanded graphite composite by water-assisted melting and mixing extrusion and application of method
  • Method for preparing polypropylene/expanded graphite composite by water-assisted melting and mixing extrusion and application of method
  • Method for preparing polypropylene/expanded graphite composite by water-assisted melting and mixing extrusion and application of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The water-assisted melting mixing extrusion equipment adopted in the present invention comprises an extruder, a set of water injection device, and a water ring vacuum pump. Along the flow direction of the material, the barrel of the extruder is provided with a feeding port, a water injection port and an exhaust port. The feeding port is used to add premixed PP, PP-g-MA and EG powder mixture, the water injection port is used to inject deionized water, and the exhaust port is used to extract water vapor. The water injection port is provided with a nozzle, and the nozzle is connected with a water injection device, and the water injection device includes a liquid storage cylinder and a metering pump. The exhaust port is connected with a water ring vacuum pump.

[0033] Premix PP and PP-g-MA pellets and EG powder according to the mass ratio of 85:10:5, and then feed from the feeding port ( figure 1 Section I) is added into the extruder for melting and kneading; when the me...

Embodiment 2

[0035] This embodiment adopts the water-assisted melt kneading extrusion equipment of embodiment 1.

[0036]Premix PP, PP-g-MA pellets and EG powder according to the mass ratio of 80:10:10, then put them into the extruder for melt mixing; when the melt pressure in the water injection section of the extruder reaches above 3MPa, Inject deionized water from the water inlet of the extruder into the melt by means of a metering pump. During the water-assisted melt mixing extrusion process, EG was well stripped and dispersed, and the PP / EG composite material with EG well stripped and dispersed was obtained by extruding at the outlet of the machine head.

[0037] The parts not mentioned are the same as in Example 1.

Embodiment 3

[0039] This embodiment adopts the water-assisted melt kneading extrusion equipment of embodiment 1.

[0040] Premix PP, PP-g-MA pellets and EG powder according to the mass ratio of 75:10:15, then put them into the extruder for melt mixing; when the melt pressure in the water injection section of the extruder reaches above 3MPa, Inject deionized water from the water inlet of the extruder into the melt by means of a metering pump. During the water-assisted melt mixing extrusion process, EG was well stripped and dispersed, and the PP / EG composite material with EG well stripped and dispersed was obtained by extruding at the outlet of the machine head.

[0041] The parts not mentioned are the same as in Example 1.

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Abstract

The invention discloses a method for preparing a polypropylene (PP)/expanded graphite (EG) composite by water-assisted melting and mixing extrusion and application of the method, which ensure good stripping and dispersion of expanded graphite, and relates to the technical field of high-polymer-material-based composites and preparation thereof. The adopted raw materials comprise PP, maleic anhydride grafted PP (PP-g-MA) and EG powder. The method is characterized in that the three raw materials are pre-mixed, the obtained mixture is added into water-assisted melting and mixing extrusion equipment for mixing extrusion, deionized water is injected into a melt in an extruder by a metering pump for mixing, and water plays the roles of promoting stripping and dispersion of EG and enhancing interaction between a PP molecular chain and an EG lamella, so that heat transfer channels in the PP/EG composite are increased, interface thermal resistance between PP and the EG lamella is reduced, and accordingly, the heat conductivity of the composite is improved. The method is simple to operate and does not need any pre-treatment of EG.

Description

technical field [0001] The invention relates to the technical field of polymer material / expanded graphite composite material and its preparation, in particular to a method for realizing better stripping and dispersion of expanded graphite in the process of water-assisted melt mixing and extruding to prepare polypropylene / expanded graphite with excellent performance Composite methods and their applications. Background technique [0002] Polymer materials have the advantages of wide sources, easy processing and molding, and low cost, so they are widely used. However, the thermal conductivity of polymer materials is generally low, which limits their applications in electronic packaging, microcircuits and other fields. At present, the thermal conductivity is mainly improved by adding high thermal conductivity fillers to polymer materials. For polymer-based composites, the dispersion state of fillers is a key factor in determining performance. Expanded graphite (EG) presents a...

Claims

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Application Information

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IPC IPC(8): B29B7/94B29B7/42C08L23/12C08L51/06C08K7/24
Inventor 黄汉雄柯栋盈
Owner SOUTH CHINA UNIV OF TECH
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