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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 narrow processing temperature, low mechanical properties, 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

[0008] 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 low, and the infiltration of concrete and reinforcement is not complete, and a polypropylene self-reinforced composite material and its preparation method are provided

Method used

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Examples

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preparation example Construction

[0030] The present invention also provides a kind of preparation method of polypropylene self-reinforcing composite material, and this method comprises the following steps:

[0031] (1) The mixture of high melting point polypropylene and β crystal nucleating agent is used as the core layer;

[0032] (2) Use low melting point polypropylene as the outer layer;

[0033] (3) co-extruding the core layer and the outer layer to obtain a co-extruded polypropylene strip;

[0034] (4) After stretching the co-extruded sheet, weave it to obtain plain, twill, satin or three-dimensional polypropylene fabric;

[0035] (5) Put the co-extruded polypropylene strip and / or the polypropylene fabric into a mold, and then use polypropylene for injection molding.

[0036] According to the present invention, in step (3), a three-layer co-extrusion casting machine is used, and core layer polypropylene and outer layer polypropylene are respectively added to two extruders, and extrusion casting molding...

Embodiment 1

[0045] This example is used to illustrate the preparation method of the polypropylene self-reinforced composite material provided by the present invention.

[0046] Core layer polypropylene: high melting point polypropylene F300C with a melting point of 165°C, wherein, based on 100 parts by weight of the core layer of the co-extruded polypropylene strip, the content of the high melting point polypropylene is 94 parts by weight , the content of the β crystal 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; and 6wt% of the β-crystal nucleating agent is composite nucleating agent VP101B;

[0047] Outer layer polypropylene: low-melting polypropylene F560EPS with a melting point of 135°C. The low-melting polypropylene has a melting point start temperature of 130.4°C and a molecular weight Mw of 3.6×10 5 , PD is 6.4, melt index is 3.0g / 10min;

[0048] Preparation of t...

Embodiment 2

[0055] This example is used to illustrate the preparation method of the polypropylene self-reinforced composite material provided by the present invention.

[0056] Core layer polypropylene: blend high-melting-point polypropylene F300C with a melting point of 165°C and 8 wt% of β-crystal nucleating agent 2,6-phthalic acid cyclohexylamide, wherein 100 parts by weight of the three-layer 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 3.8×10 5 , PD is 5.06, melt index is 3.0g / 10min;

[0057] Outer layer polypropylene: low-melting polypropylene F560EPS with a melting point of 135°C. The low-melting polypropylene has a melting point start temperature of 130.4°C and a molecular weight Mw of 3.6×10 5 , PD is 6.4, melt index is 3.0g / 10min;

...

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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 a core layer; (2) low melting point polypropylene is used as an outer layer; (3) the core layer and the outer layer are coextruded to obtain a coextruded polypropylene strip; (4) a coextruded polypropylene sheet is slowly stretched at low temperature, and weaved into a plain, twill, satin-line or three-dimensional polypropylene fabric; and (5) the coextruded polypropylene strip and / or the polypropylene fabric are / is put into a die, and then polypropylene is used for injection molding. The beta crystal form nucleating agent is added into the production process, by slow stretching at low temperature and a simple injection molding method, the impact toughness of the material is improved, and the tensile strength of the material is kept even improved.

Description

technical field [0001] The invention relates to a polypropylene self-reinforcing composite material and a preparation method thereof. Background technique [0002] The present invention is one of the most important general-purpose plastics, and the modification and enhancement of polypropylene has always been the focus of researchers. With the development of industry, products in industries such as automobiles, daily light industry, and medicine all need polypropylene materials with excellent comprehensive properties and low processing costs. Therefore, it is one of the main topics of the industry to further balance and improve the performance of current polypropylene materials. How to balance the mechanical properties of polypropylene while improving the tensile strength and impact toughness of polypropylene is a research hotspot. [0003] The usual method is to introduce a second phase into the plastic, such as rubber, fiber, etc., or change the crystal form of polypropy...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08J5/04C08K5/20B29B11/10B29C45/14B29C45/78B29C47/92B29C55/02B29C48/92
Inventor 邹浩徐毅辉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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