Beta-crystal-form polypropylene strip and preparation method thereof

A technology of β-crystalline polypropylene, which is applied in the field of β-crystalline polypropylene strips and its preparation, can solve the problems of low strength and low draw ratio

Inactive 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

[0009] The purpose of the present invention is to overcome the defects of low draw ratio and low strength of α-cry

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0030] The present invention also provides a method for preparing a β-crystalline polypropylene strip, the method comprising the following steps:

[0031] (1) Polypropylene and β crystal nucleating agent are mixed and granulated;

[0032] (2) extruding after drying the β-crystalline polypropylene particles formed in step (1);

[0033] (3) Slowly stretching the β-crystal polypropylene sheet extruded in step (2) at a low temperature to obtain β-crystal polypropylene strips.

[0034] According to the present invention, the thickness of the β-crystalline polypropylene sheet may be 200-500 microns, preferably 250-400 microns, more preferably 280-320 microns.

[0035] According to the present invention, in step (1), before the mixture of polypropylene and β crystal nucleating agent is mixed and granulated, the method also includes mixing the mixture of polypropylene and β crystal nucleating agent in a high-speed mixer Stir in the middle to make the polypropylene and the β crystal ...

Embodiment 1

[0047] This example is used to illustrate the preparation method of the β crystal polypropylene tape provided by the present invention.

[0048] The β crystal form nucleating agent VP101B and polypropylene (PPR-F07V) were mixed in a high-speed mixer for 2 minutes, and then extruded and granulated by using a twin-screw extruder with a motor speed of 250rpm, and then the obtained β crystal Type polypropylene particles are dried at 70°C;

[0049] Using an extrusion caster to extrude a β-crystalline polypropylene sheet at a temperature of 180°C and a screw speed of 35 rpm, the thickness of the β-crystalline polypropylene sheet is 280 μm;

[0050] Then stretch at a temperature of 100° C., a stretching rate of 2 m / min, and stretching ratios of 8, 10, 12, and 16 times, respectively.

[0051] Results The β crystal polypropylene strip C1 was prepared;

[0052] The medium crystallinity of the β-crystalline polypropylene strip C1 is X β 70%, the content of β crystal form is 35% by wei...

Embodiment 2

[0056] This example is used to illustrate the preparation method of the β crystal polypropylene tape provided by the present invention.

[0057] The β crystal nucleating agent TMB-4 (substituted aromatic amide β nucleating agent) and polypropylene (PPR-F07V) were mixed in a high-speed mixer for 2 minutes, and then extruded at a motor speed of 300rpm using a twin-screw extruder Granulating, and then drying the obtained β-crystalline polypropylene particles at a temperature of 70°C;

[0058] Then use an extrusion casting machine to extrude a β-crystalline polypropylene sheet at a temperature of 200 ° C and a screw speed of 25 rpm, and the thickness of the β-crystalline polypropylene sheet is 300 μm;

[0059] Then stretch at a temperature of 110° C., a stretching rate of 3 m / min, and stretching ratios of 8, 10, 12, and 16 times, respectively.

[0060] Results The β-crystalline polypropylene strip C2 was prepared;

[0061] The medium crystallinity of the β-crystalline polypropyl...

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Abstract

The present invention discloses a beta-crystal-form polypropylene strip and a preparation method thereof, wherein the method comprises the following steps: (1) polypropylene and a beta-crystal-form nucleating agent are mixed for granulation; (2) beta-crystal-form polypropylene particles formed by the step (1) are dried and then molded by extrusion; and (3) the a beta-crystal-form polypropylene sheet molded by extrusion by the step (2) is stretched slowly at low temperature to obtain the beta-crystal-form polypropylene strip. The beta-crystal-form polypropylene strip obtained by the method is easier to stretch, not easy to break, higher in stretching ratio, and more stable in material mechanical performances.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a β-crystalline polypropylene strip and a preparation method thereof. Background technique [0002] The reason why polypropylene can be used as a general-purpose plastic is that its raw material and processing costs are relatively low, and its density is small, and it is easy to recycle and other performance characteristics. However, compared with engineering materials, polypropylene has low mechanical properties, especially poor impact toughness. This also leads to its limited use in corresponding application fields. [0003] In order to solve this problem, polypropylene self-reinforcing materials have received extensive attention. [0004] This is due to the high mechanical properties of polypropylene self-reinforcement materials. Some foreign researchers have found that the tensile modulus of bulk reinforced polypropylene composite materials can reach 5GPa. At ...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08K5/00
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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