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Self-reinforced polypropylene composite material and preparation method thereof

A technology of composite materials and polypropylene, applied in the direction of chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the problems of narrow process temperature range, limited application, complex process, etc., to increase process application range, low energy consumption of equipment, and simple production process

Inactive Publication Date: 2013-05-22
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process temperature range of this method is extremely narrow (1-2°C), which limits its application in the process, and the process is complicated

Method used

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  • Self-reinforced polypropylene composite material and preparation method thereof
  • Self-reinforced polypropylene composite material and preparation method thereof
  • Self-reinforced polypropylene composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A preparation method of self-reinforced polypropylene composite material:

[0042] (1) Twin-screw co-extrusion to prepare highly oriented polypropylene strips:

[0043] Add high-melting point isotactic polypropylene and low-melting point random copolymerized polypropylene into two single-screw machines respectively, and adjust the pump supply so that the extrusion volume of high-melting point isotactic polypropylene and low-melting point random copolymerized polypropylene is controlled to be 9: 1. Obtain a polypropylene sheet with a "sandwich" structure through a co-extrusion die; use a dividing knife to divide the obtained sheet into strips with a width of 10mm; stretch the divided strips 24 times through an infrared heating oven at 135°C , wherein the stretching is a two-step thermal stretching, and the stretched strip is curled into a tube.

[0044] (2) Woven polypropylene strip fabric:

[0045] Place the strip bobbin obtained in the above technological process on ...

Embodiment 2

[0051]A self-reinforced polypropylene composite material, the composite material is a layered structure material obtained by hot pressing two layers of sheets, and the sheets of each layer are plain weave fabrics obtained by weaving tube strips, and the sheets are three layers Structure, the middle layer of the sheet is isotactic polypropylene with high melting point, and the upper and lower surfaces of the middle layer are surface layers composed of random copolymerized polypropylene with low melting point. The preparation method of self-reinforced polypropylene composite material comprises the following steps:

[0052] (1) Using screw co-extrusion to prepare a sheet composed of high-melting point isotactic polypropylene and low-melting point random copolymerized polypropylene, the high-melting point polypropylene constitutes the middle layer, and the low-melting point polypropylene constitutes the upper and lower surface layers, The mass percentage of the surface layer is 5%...

Embodiment 3

[0056] A self-reinforced polypropylene composite material, the composite material is a layered structure material obtained by hot pressing of 5-layer sheets, and the sheets of each layer are twill fabrics obtained by weaving through tube strips, and the sheets are three layers Structure, the middle layer of the sheet is isotactic polypropylene with high melting point, and the upper and lower surfaces of the middle layer are surface layers composed of random copolymerized polypropylene with low melting point. The preparation method of self-reinforced polypropylene composite material comprises the following steps:

[0057] (1) Using screw co-extrusion to prepare a sheet composed of high-melting point isotactic polypropylene and low-melting point random copolymerized polypropylene, the high-melting point polypropylene constitutes the middle layer, and the low-melting point polypropylene constitutes the upper and lower surface layers, The mass percentage of the surface layer is 7%...

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Abstract

The invention relates to a self-reinforced polypropylene composite material and a preparation method thereof. The preparation method comprises the following steps: preparing a sheet composed of high-melting-point polypropylene and low-melting-point polypropylene by screw coextrusion, separating the sheet into strips which are 5-20mm wide, carrying out hot stretching, and coiling into cylinders; weaving the cylindrical strips into a fabric; and finally, carrying out hot pressing on a plurality of layers of fabrics to obtain the composite material. Compared with the prior art, the invention widens the hot pressing temperature window of the self-reinforced polypropylene composite material sheet, and the prepared product has favorable properties.

Description

technical field [0001] The invention belongs to the field of composite material preparation, in particular to a self-reinforced polypropylene composite material and a preparation method thereof. Background technique [0002] To increase the strength and stiffness of bulk polymers, fiber reinforcements are widely used to structurally reinforce polymers. However, since the reinforcing fiber and the matrix are generally two materials with different components, such as glass fiber reinforced polypropylene, it is difficult to recycle the material; at the same time, due to the physical and chemical properties between the reinforcement and the matrix, including surface energy, The difference makes it difficult to form a good interface between the two to effectively transfer stress. Researchers have therefore attempted to develop composite materials in which the matrix and reinforcement have the same chemical composition and physical structure. [0003] Researchers at the Universi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/32
Inventor 曹凯
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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