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A kind of lightweight high-strength polypropylene foam material and its preparation method and application

A polypropylene foam and high-strength technology, applied in the field of polypropylene foam materials, can solve the problems of poor mechanical properties, long processing process, low efficiency, etc., and achieve precise control of mechanical properties, precise control of heat insulation performance, and stable and reliable process Effect

Active Publication Date: 2020-03-17
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of the first two processing methods are long processing process, low efficiency, high scrap rate, and high cost. The third processing method has the advantages of short process, high flexibility, and high efficiency. However, the PP produced by this method is currently Foam products have high density and poor mechanical properties

Method used

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  • A kind of lightweight high-strength polypropylene foam material and its preparation method and application
  • A kind of lightweight high-strength polypropylene foam material and its preparation method and application
  • A kind of lightweight high-strength polypropylene foam material and its preparation method and application

Examples

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Effect test

Embodiment 1

[0052] A method for preparing lightweight high-strength polypropylene foam material, the raw material is random copolymerized PP, and its density is 0.9g / cm 3 (@23°C), the melt flow index is 20g / 10min; the added TPU is polyether type, the hardness is 75A; the nucleating agent is 3000 mesh talc powder; the foaming agent used is supercritical carbon dioxide with a purity of 99.9%.

[0053] The method comprises the steps of:

[0054] (1) PP, TPU, and nucleating agent are blended in a ratio of 87:5:8 by mass percentage to obtain a PP-based compound;

[0055] (2) Add the PP-based compound obtained in step (1) into a microcellular foaming injection molding machine, and under the double action of the shearing of the screw of the injection molding machine and the heating of the barrel, the PP-based compound is gradually plasticized and melted, and plasticized The temperature of the PP-based composite melt after melting is 220°C, and the pressure of the PP-based composite melt during ...

Embodiment 2

[0062] A method for preparing lightweight high-strength polypropylene foam material, the raw material is linear homopolymer PP, and its density is 0.9g / cm 3 (@23℃), the melt flow index is 100g / 10min; the added TPU is polyester type, the hardness is 95A; the nucleating agent is 10000 mesh montmorillonite powder; the foaming agent used is supercritical with a purity of 99.9% carbon dioxide.

[0063] The method comprises the steps of:

[0064] (1) Blending PP, TPU, and nucleating agent in a ratio of 72:25:3 by mass percentage to obtain a PP-based compound;

[0065] (2) Add the PP-based compound obtained in step (1) into a microcellular foaming injection molding machine, and under the double action of the shearing of the screw of the injection molding machine and the heating of the barrel, the PP-based compound is gradually plasticized and melted, and plasticized The temperature of the PP-based composite melt after melting is 170°C, and the pressure of the PP-based composite mel...

Embodiment 3

[0072] A method for preparing lightweight high-strength polypropylene foam material, the raw material is isotactic copolymerization PP, and its density is 0.9g / cm 3 (@23℃), the melt flow index is 40g / 10min; the added TPU is polyether type, the hardness is 85A; the nucleating agent is 5000 mesh calcium carbonate powder; the foaming agent used is supercritical nitrogen with a purity of 99.9% .

[0073] The method comprises the steps of:

[0074] (1) Blending PP, TPU, and nucleating agent at a ratio of 82:15:3 by mass percentage to obtain a PP-based compound;

[0075] (2) Add the PP-based compound obtained in step (1) into a microcellular foaming injection molding machine, and under the double action of the shearing of the screw of the injection molding machine and the heating of the barrel, the PP-based compound is gradually plasticized and melted, and plasticized The temperature of the PP-based composite melt after melting is 240°C, and the pressure of the PP-based composite ...

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Abstract

The invention relates to a preparation method of a lightweight high-strength polypropylene foam material, and belongs to the field of polypropylene foam materials. The method provided by the inventionis based on coupling modification between thermoplastic polyurethane and a nucleating agent to prepare the lightweight high-strength polypropylene foam product, the PP foam product with characteristics of light weight and high strength can be directly formed and prepared by the method, and the density, mechanical properties and thermal-insulation properties of the PP foam product can be preciselyregulated and controlled in a wide range; and the preparation method has the outstanding advantages of stability and reliability, high production efficiency and low costs.

Description

technical field [0001] The invention belongs to the field of polypropylene foam materials, and in particular relates to a method for preparing lightweight high-strength polypropylene foam materials based on coupled modification of thermoplastic polyurethane and a nucleating agent. Background technique [0002] Polypropylene (PP) foam products have the characteristics of light weight, high elasticity, shock absorption and heat insulation, and can be widely used in automobiles, home appliances, rail transit, packaging and transportation, building insulation and other fields. At present, PP foam products are mainly prepared in three ways. The first way is: first prepare PP bead foam by autoclave foaming or extrusion foaming, and then process the PP bead foam into PP foam products with a certain geometric shape by steam molding technology; the second way Yes: first process PP pellets into preforms by injection molding or extrusion molding, and then process the preforms into PP ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/14C08L75/08C08L75/06C08K3/34C08J9/12
Inventor 王桂龙柴佳龙魏超李昕阳杨春霞蒋文军
Owner SHANDONG UNIV
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