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Method for stably measuring rheological property of polypropylene with ultrahigh melt flow rate

A melt flow rate and melt flow rate technology, applied in the field of polymer material testing and characterization, can solve problems such as data fluctuation, achieve accurate rheological properties, improve accuracy and persuasiveness

Pending Publication Date: 2022-05-06
SOUTH CHINA UNIV OF TECH
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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 solve the problem of data fluctuations in the process of measuring the rheological properties of ultra-high melt flow rate polypropylene, and provide a method for stably measuring the rheological properties of ultra-high melt flow rate polypropylene

Method used

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  • Method for stably measuring rheological property of polypropylene with ultrahigh melt flow rate
  • Method for stably measuring rheological property of polypropylene with ultrahigh melt flow rate
  • Method for stably measuring rheological property of polypropylene with ultrahigh melt flow rate

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Embodiment 1

[0036] Take an appropriate amount of powdered metallocene isotactic polypropylene with a melt flow rate of 200g / 10min (230, ℃ 2.16kg), add it to the rotational rheometer test platform, heat up the tablet, adjust the test gap to 1mm, and start the test. The test conditions are set as follows: a parallel plate rotor with a diameter of 50 mm is used, the shear strain is 0.3%, the shear frequency is 0.1-100 Hz, and the test temperature is 190-160 °C. See test results figure 1 .

Embodiment 2

[0038] Take an appropriate amount of powdered metallocene isotactic polypropylene with a melt flow rate of 1350g / 10min (230, ℃ 2.16kg), add it to the rotational rheometer test platform, heat up the tablet, adjust the test gap to 1mm, and start the test. The test conditions are set as follows: a parallel-plate rotor with a diameter of 50 mm is used, the shear strain is 0.3%, the shear frequency is 0.1-100 Hz, and the test temperature is 170-140 °C. See test results figure 2 .

Embodiment 3

[0040] Take an appropriate amount of powdered metallocene isotactic polypropylene with a melt flow rate of 1400g / 10min (230, ℃ 2.16kg), add it to the rotational rheometer test platform, heat up the tablet, adjust the test gap to 1mm, and start the test. The test conditions are set as follows: a parallel plate rotor with a diameter of 50 mm is used, the shear strain is 0.3%, the shear frequency is 0.1-100 Hz, and the test temperature is 170-150°C. See test results image 3 .

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Abstract

The invention discloses a method for stably measuring the rheological property of polypropylene with an ultrahigh melt flow rate. According to the method, the rheological property of the polypropylene with the ultrahigh melt flow rate is measured by adopting a large-diameter parallel plate rotor in a frequency scanning mode of oscillation from low frequency to high frequency, and obtained rheological data accord with theoretical prediction and are more stable; the phenomenon of rheological data fluctuation in the process of testing the rheological property of the ultra-high melt flow rate polypropylene by adopting a small-diameter parallel plate rotor can be solved, and the rheological property of the ultra-high melt flow rate polypropylene can be stably represented.

Description

technical field [0001] The invention belongs to the field of polymer material testing and characterization, in particular to a method for stably measuring the rheological properties of polypropylene with ultra-high melt flow rate. Background technique [0002] Rotational rheometer is one of the instruments for studying and measuring the rheological properties of materials. It adopts the method of applying forced steady rate load, steady state stress load, dynamic sinusoidal periodic strain load or dynamic sinusoidal periodic stress load to the sample. Response data for the applied load. [0003] By measuring the shear rate, shear stress, oscillation frequency, stress-strain amplitude and other rheological data of the sample, the rheological parameters such as the viscosity, storage modulus, loss modulus, loss tangent (Tanδ) of the sample are calculated, Then characterize the rheological properties of the material. Rotational rheometer is a widely used rheological measuring...

Claims

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Application Information

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IPC IPC(8): G01N11/14
CPCG01N11/142
Inventor 杨军忠林晓年
Owner SOUTH CHINA UNIV OF TECH