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A kind of low-density polypropylene bead foam, its preparation method and application

A technology of low-density polypropylene and beads, which is applied in the field of extruding and foaming low-density polypropylene bead foam, can solve problems such as poor product uniformity, low production efficiency, and unstable process, and achieve improved foaming effect and high Effect of porosity and uniform appearance

Active Publication Date: 2021-03-16
福建鑫瑞新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the process control of the kettle pressure foaming method is relatively simple, its production efficiency is low, the process is unstable, the product uniformity is poor, and there are certain safety hazards in the production process.

Method used

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  • A kind of low-density polypropylene bead foam, its preparation method and application
  • A kind of low-density polypropylene bead foam, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Based on the prior application of the present invention (CN 109228003A), the present invention further improves the preparation raw materials of bead foam, and obtains bead foam with better performance. In this embodiment, a feasible processing method is provided. as attached figure 1 As shown, the device for preparing PP bead foam by extrusion foaming used in Examples 2 to 4 below includes an extrusion mixing unit, a supercritical fluid injection unit, a static mixing unit, a gear pump, a melt cooler, an extrusion It is composed of die head, underwater pelletizing system, etc. Among them, the extrusion mixing unit, static mixing unit 8, gear pump 10, melt cooler 11, extrusion die head 12, underwater pelletizing system, etc. are connected in series in sequence, and the supercritical fluid injection unit is connected with the extrusion unit through pipelines. The air injection holes on the barrel of the mixing unit are connected together.

[0041] The main body of the...

Embodiment 2

[0049] The raw material is high melt strength PP produced by Borealis, the brand name is WB140HMS, and its density is 0.905g / cm 3 (@23°C), the melt index is 2.1g / 10min (@230°C / 2.16kg); the mesh of UHMWPE solid powder is 100 mesh, and the addition amount is 5.0% by weight; the added nano-carbon material is multi-walled carbon Nanotube, its addition amount is 0.25% weight fraction; Supercritical fluid I is the carbon dioxide of purity 99.9%, supercritical fluid II is the nitrogen of purity 99.5%; The injection amount of carbon dioxide is 4.5% weight fraction, and the injection amount of nitrogen is 0.3 % weight fraction.

[0050] The twin-screw temperature is set at 180°C; the barrel temperature of the twin-screw extruder is 60°C–160°C–180°C–200°C–200°C–200°C–190°C–190°C–190°C from the hopper to the extrusion port –180°C–175°C–175°C, the screw speed is 25 rpm; the temperature of the static mixer is set to 150°C; the control pressure of the gear pump is set to 10.5MPa, and the t...

Embodiment 3

[0053] The raw material is random copolymerized polypropylene produced by Saudi Basic Industries Corporation (SABIC), and its density is 0.905g / cm 3 (@23°C), the melt index is 1.7g / 10min (@230°C / 2.16kg); the mesh number of UHMWPE solid powder is 1000 mesh, and the addition amount is 15% by weight; the added nano-carbon material is graphene, Its addition is 0.5% by weight; supercritical fluid I is carbon dioxide with a purity of 99.9%, and supercritical fluid II is nitrogen with a purity of 99.5%; the injection amount of carbon dioxide is 8% by weight, and the injection amount of nitrogen is 0.25% by weight .

[0054] The twin-screw temperature is set at 200°C; the barrel temperature of the twin-screw extruder is 60°C–160°C–180°C–200°C–200°C–200°C–200°C–200°C–200°C from the hopper to the extrusion port –190°C–180°C–180°C, the screw speed is 50 rpm; the temperature of the static mixer is set to 155°C; the control pressure of the gear pump is set to 14MPa, and the temperature of...

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Abstract

The invention belongs to the technical field of microporous plastic preparation, and particularly relates to low-density polypropylene bead foam as well as a preparation method and application thereof. The invention provides a method for preparing low-density polypropylene bead foam through extrusion foaming based on coupling modification of ultra-high molecular weight polyethylene and a nano carbon material. The preparation method comprises the following steps: mixing PP, UHMWPE and a nano carbon material in proportion, and then injecting a physical foaming agent into the mixture; fully and uniformly mixing the materials in a double-screw extruder, extruding the mixture, enabling the extruded mixture to sequentially flow through a static mixer, a gear pump, a melt cooler, an extrusion dieand the like which are arranged at the downstream of the double-screw extruder for extrusion foaming, and carrying out underwater pelletizing and drying to obtain the PP bead foam. The PP bead foam prepared by the method is low in density, uniform and full in appearance, small in shrinkage, uniform in cell structure, low in aperture ratio and easy for later steam molding.

Description

technical field [0001] The invention belongs to the technical field of preparation of microporous plastics, in particular to an extruded foamed low-density polypropylene bead foam based on coupling modification of ultra-high molecular weight polyethylene and nano-carbon materials, the preparation method and application of the bead foam . Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Polypropylene (PP) bead foam is a bead-like material with a porous structure made of polypropylene as a matrix and foamed. Using steam molding or bonding molding, PP bead foam can be processed into PP foam products with a certain geometric structure, which has excellent characteristics such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L23/06C08K3/04C08K7/00C08J9/12B29B9/06B29B9/12
CPCB29B9/065B29B9/12C08J9/0061C08J9/0071C08J9/122C08J2203/06C08J2203/08C08J2323/12C08J2423/06C08K7/00C08K2201/011C08K3/041C08K3/042C08K3/045
Inventor 王桂龙柴佳龙魏超徐兆瑞赵国群董桂伟
Owner 福建鑫瑞新材料科技有限公司
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