Polypropylene self-reinforced composite and preparation method thereof

A reinforced composite material and composite material technology, applied in the field of polypropylene self-reinforced composite material and its preparation, can solve the problems of low mechanical properties, narrow processing temperature, incomplete infiltration of reinforcement, etc.

Active Publication Date: 2016-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects in the prior art that the processing temperature is too narrow, the mechanical properties are l

Method used

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Examples

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preparation example Construction

[0031] The present invention also provides a kind of preparation method of polypropylene self-reinforcing composite material, and this method comprises the following steps:

[0032] (1) high melting point polypropylene and β crystal nucleating agent are mixed as core layer polypropylene;

[0033] (2) Low melting point polypropylene is used as the outer layer polypropylene;

[0034] (3) coextruding the core layer polypropylene and the outer layer polypropylene to obtain a coextruded polypropylene strip;

[0035] (4) obtain plain, twill, satin or three-dimensional polypropylene fabric through weaving after stretching the co-extruded polypropylene strip;

[0036] (5) The first polypropylene sheet, the intermediate sheet and the second polypropylene sheet are sequentially stacked and hot-pressed, wherein the polypropylene fabric is the intermediate sheet.

[0037] According to the present invention, in step (3), a three-layer co-extrusion casting machine is used, and core layer ...

Embodiment 1

[0046] This example is used to illustrate the preparation method of the polypropylene self-reinforced composite material provided by the present invention.

[0047] Core layer polypropylene: mix high melting point polypropylene F300C with a melting point of 165°C and 6wt% β crystal form nucleating agent VP101B evenly, wherein the core layer of the co-extruded polypropylene strip is 100 parts by weight Standard, the content of the high-melting-point polypropylene is 94 parts by weight, and the content of the β crystal form nucleating agent is 6 parts by weight; wherein, the molecular weight Mw of the high-melting-point polypropylene is 3.8×10 5 , PD is 5.06, melt index is 3.0g / 10min;

[0048] Outer layer polypropylene: low melting point polypropylene F560EPS with a melting point of 135°C, the starting temperature of the melting point of the low melting point polypropylene is 130.5°C, and the molecular weight Mw is 3.6×10 5 , PD is 6.4, melt index is 3.0g / 10min;

[0049] Prepa...

Embodiment 2

[0056] This example is used to illustrate the preparation method of the polypropylene self-reinforced composite material provided by the present invention.

[0057] Core layer polypropylene: blending high melting point polypropylene T30S with a melting point of 165°C and 8wt% β-crystal nucleating agent 2,6-phthalic acid cyclohexanamide, wherein 100 parts by weight of the three layers The core layer of the co-extruded polypropylene strip is a benchmark, the content of the high-melting-point polypropylene is 92 parts by weight, and the content of the β-crystal nucleating agent is 8 parts by weight; wherein, the molecular weight of the high-melting-point polypropylene Mw is 4.0×10 5 , PD is 7.35, melt index is 3.5g / 10min;

[0058] Outer layer polypropylene: low melting point polypropylene F560EPS with a melting point of 135°C, the starting temperature of the melting point of the low melting point polypropylene is 130.5°C, and the molecular weight Mw is 3.6×10 5 , PD is 6.4, mel...

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Abstract

The present invention discloses a polypropylene self-reinforced composite and a preparation method thereof, wherein the method comprises the following steps: (1) high melting point polypropylene and a beta crystal form nucleating agent are mixed as core layer polypropylene; (2) low melting point polypropylene is used as outer layer polypropylene; (3) the core layer polypropylene and the outer layer polypropylene are coextruded for molding to obtain a coextruded polypropylene strip; (4) the coextruded polypropylene strip is stretched, and weaved into a plain, twill, satin-line or three-dimensional polypropylene fabric; and (5) a first polypropylene sheet, an interlayer sheet and a second polypropylene sheet are in turn laminated and hot-pressed, and a polypropylene fabric is used as the interlayer sheet. The beta crystal form nucleating agent is added into the production process, so that the stretching is stretch, the polypropylene self-reinforced composite is not easy to fracture, the stretching ratio is higher, and the material mechanical performances are more stable.

Description

technical field [0001] The invention relates to a polypropylene self-reinforcing composite material and a preparation method thereof. Background technique [0002] For many years, polypropylene, as a general-purpose plastic, has been widely researched and applied due to its low cost, wide sources, light weight, and easy recycling. Polypropylene has excellent mechanical and optical properties, but due to the large number of side methyl groups in its chain segments, polypropylene materials are usually limited to low impact strength and weather resistance, which is also a problem that researchers hope to solve . [0003] The β crystal form of polypropylene is a hexagonal crystal system. Studies have found that the β crystal form is more likely to harden during stretching, so it has higher impact toughness. At the same time, the β crystal form polypropylene also has a lower heat distortion temperature. Therefore, adding a β-nucleating agent to polypropylene to increase the pro...

Claims

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Application Information

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IPC IPC(8): B32B27/12B32B27/32B32B27/06B32B27/18B32B37/02B32B37/06C08L23/12B29C47/06
Inventor 徐毅辉邹浩高达利张师军徐萌白弈青尹华吕芸邵静波张丽英董穆刘建叶初立秋
Owner CHINA PETROLEUM & CHEM CORP
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