Low-temperature-impact-resistant stress-whitening-resistant polypropylene material and preparation method thereof

A technology for anti-stress whitening and polypropylene materials, applied in the field of polypropylene composite materials, can solve the problems of limited application scope and poor appearance of parts, and achieve the effects of uniform phase structure, tight arrangement and improved crystallinity

Active Publication Date: 2021-03-26
上海日之升科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent CN103242586B discloses a low-temperature impact-resistant, low-stress whitening long glass fiber-reinforced polypropylene material, which is modified by using a low-temperature impact-resistant, low-stress whitening masterbatch and long glass fiber-reinforced polypropylene mas

Method used

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  • Low-temperature-impact-resistant stress-whitening-resistant polypropylene material and preparation method thereof
  • Low-temperature-impact-resistant stress-whitening-resistant polypropylene material and preparation method thereof
  • Low-temperature-impact-resistant stress-whitening-resistant polypropylene material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of a low-temperature impact-resistant stress-resistant whitening polypropylene material adopts the following formula:

[0036]

[0037]

[0038] The preparation steps are as follows:

[0039] (1) Mix polyperfluoroethylene propylene and polytetrafluoroethylene in a mixer for 2 minutes according to the formula ratio to obtain mixture A;

[0040] (2) According to the formula ratio, the copolymerized polypropylene, homopolypropylene, polyethylene and lignin were mixed in a mixer for 2 minutes to obtain a mixture B;

[0041] (3) Add mixture A from the first barrel of the twin-screw extruder, feed mixture B from the sixth section of the twin-screw extruder, and carry out extrusion granulation to obtain low-temperature impact-resistant stress-resistant White polypropylene material; wherein, the speed of the twin-screw extruder is 500r / min, and the temperatures of the first to sixth barrels are 280°C, 285°C, 288°C, 290°C, 300°C, 310°C, respectively. ...

Embodiment 2

[0053] A preparation method of a low-temperature impact-resistant stress-resistant whitening polypropylene material adopts the following formula:

[0054]

[0055] The preparation steps are as follows:

[0056] (1) Mix polyperfluoroethylene propylene and polytetrafluoroethylene in a mixer for 3 minutes according to the formula ratio to obtain mixture A;

[0057] (2) According to the formulation ratio, the copolymerized polypropylene, homopolypropylene, polyethylene and lignin were mixed in a mixer for 3 minutes to obtain a mixture B;

[0058] (3) Add mixture A from the first barrel of the twin-screw extruder, feed mixture B from the sixth section of the twin-screw extruder, and carry out extrusion granulation to obtain low-temperature impact-resistant stress-resistant White polypropylene material; wherein, the speed of the twin-screw extruder is 550r / min, and the temperatures of the first section of the cylinder to the sixth section of the cylinder are 300°C, 300°C, 310°C,...

Embodiment 3

[0061] A preparation method of a low-temperature impact-resistant stress-resistant whitening polypropylene material adopts the following formula:

[0062]

[0063]

[0064] The preparation steps are as follows:

[0065] (1) Mix polyperfluoroethylene propylene and polytetrafluoroethylene in a mixer for 5 minutes according to the formula ratio to obtain mixture A;

[0066] (2) According to the formula ratio, the copolymerized polypropylene, homopolypropylene, polyethylene and lignin were mixed in a mixer for 5 minutes to obtain a mixture B;

[0067] (3) Add mixture A from the first barrel of the twin-screw extruder, feed mixture B from the sixth section of the twin-screw extruder, and carry out extrusion granulation to obtain low-temperature impact-resistant stress-resistant White polypropylene material; wherein, the speed of the twin-screw extruder is 600r / min, and the temperatures of the first section of the cylinder to the sixth section of the cylinder are 290°C, 300°C...

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Abstract

The invention relates to a low-temperature-impact-resistant stress-whitening-resistant polypropylene material and a preparation method thereof. The preparation method comprises the following steps: mixing, by weight, 5-10 parts of a tetrafluoroethylene-hexafluoropropylene copolymer and 20-50 parts of polytetrafluoroethylene in a mixer to obtain a mixture A; mixing 100 parts of co-polypropylene (namely an ethylene-propylene copolymer, wherein the melt index of the ethylene-propylene copolymer under the test conditions of 230 DEG C and 2.16 kg is 5-12 g/10 min), 100 parts of homo-polypropylene (with a melt index of 1500-1900 g/10 min under the test conditions of 230 DEG C and 2.16 kg), 100 parts of polyethylene and 10-20 parts of lignin in the mixer to obtain a mixture B; and finally, addingthe mixture A from a first-section cylinder of a double-screw extruder, laterally feeding the mixture B from a sixth-section of the double-screw extruder, and carrying out extrusion granulation to obtain the low-temperature-impact-resistant stress-whitening-resistant polypropylene material. The falling ball stress whitening performance of the finally prepared material is 1.0-1.6 delta L, and notch impact strength at a temperature of 20 DEG C and notch impact strength at a temperature of 40 DEG C are 68-75 J/M and 40-50 J/M respectively. The method is simple and easy to implement, and the prepared material is excellent in performance and wide in application prospects.

Description

technical field [0001] The invention belongs to the technical field of polypropylene composite materials, and relates to a low-temperature impact-resistant stress-resistant whitening polypropylene material and a preparation method thereof. Background technique [0002] Due to its advantages in price and performance, polypropylene materials have been widely used in household appliances, automobiles, electrical engineering, optoelectronics and other fields. However, in the process of processing and use, polypropylene materials are easily damaged by external forces Phase separation, micro-cracks, micro-holes or silver crazes will occur under the environment, which will cause changes in refraction, and eventually lead to stress whitening, which seriously affects the appearance and use of the parts, especially the stress whitening defect of copolymerized polypropylene is particularly obvious. In addition, Polypropylene materials have poor low temperature resistance and are prone ...

Claims

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Application Information

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IPC IPC(8): C08L23/16C08L23/12C08L23/06C08L27/18C08L97/00
CPCC08L23/14C08L2205/035C08L2205/025C08L2207/064C08L23/12C08L23/06C08L27/18C08L97/005
Inventor 梁伟成陈晓东洪志文侯江松阮静
Owner 上海日之升科技有限公司
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