Method for quickly measuring viscous flow activation energy of polyolefin

A technology of polyolefin and activation energy, which is applied in the direction of flow characteristics, measuring devices, instruments, etc., can solve the problems of low efficiency and low measurement efficiency, and achieve the effect of easy operation and improved accuracy

Active Publication Date: 2011-05-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The above calculation process requires special calculation software, such as Rhios V.4.4.4
In addition, to obtain the activation energy of viscous flow, multiple tests at different temperatures are also required, and the efficiency is not high.
[0015] It can be se

Method used

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  • Method for quickly measuring viscous flow activation energy of polyolefin
  • Method for quickly measuring viscous flow activation energy of polyolefin
  • Method for quickly measuring viscous flow activation energy of polyolefin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Viscous flow activation energy of HDPE 9455F.

[0070] Table 1 Viscous flow activation energy of HDPE 9455F

[0071]

Embodiment 2

[0077] Viscous flow activation energy of LDPE 2426H.

[0078] figure 1 It is the rheological test curve of LDPE 2426H, and the corresponding complex viscosity values ​​at 17 temperatures can be obtained through a temperature scanning measurement; figure 2 It is the curve of LDPE 2426H converted by the Cox-Merz rule, and the apparent viscosity values ​​at 17 temperatures are obtained after data conversion; image 3 The curve obtained for LDPE 2426H linear regression, that is, the apparent viscosity value at each temperature is linearly regressed to the corresponding temperature in Microsoft Excel software, and the parameters in the regression formula are obtained, and the activation energy of viscous flow is calculated, as shown in the table 3.

[0079] Table 3 Viscous flow activation energy of LDPE 2426H

[0080]

Embodiment 3

[0082] Viscous flow activation energy of LLDPE LL1201.

[0083] Viscous flow activation energy of table 4LLDPE LL1201

[0084]

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Abstract

The invention relates to a method for quickly measuring the viscous flow activation energy of polyolefin, which is used for measuring the viscous flow activation energy of polyolefin such as polyethylene, polypropylene, and the like. The method comprises the following steps of: carrying out temperature scanning at a temperature above the smelting point of polyolefin and below a decomposition temperature by using a dynamic rheometer to measure a plurality of change curves of the viscosity changed along with the temperature of the polyolefin; converting a measurement result into change curves of the apparent viscosity changed along with the temperature of a sample through a Cox-Merz rule; carrying out linear regression on the converted data by using a formula of lgeta=K/T+b to obtain the values of K and b in the regression formula; and then obtaining the viscous flow activation energy of the measured sample according to a formula of Eeta=19.147*(J/mol). The method has the advantages of fewer required samples, short measurement period, high speed and high efficiency.

Description

technical field [0001] The invention relates to an analysis method of polyolefin, in particular to a method for measuring activation energy of polyolefin viscous flow. Background technique [0002] At present, the domestic plastics industry has formed a relatively complete system from raw material production, product processing and manufacturing to application, but the research on rheological properties of plastic processing is relatively lagging behind, and many small and medium-sized enterprises still rely on experience for production. The precise setting of plastic processing parameters directly affects the appearance quality and internal performance of the product, so the research on the rheological properties of raw materials has a direct guiding effect on the production of plastic products. The activation energy of viscous flow is an important parameter of the rheological properties of materials. It not only reflects the difficulty of material flow, but more importantl...

Claims

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Application Information

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IPC IPC(8): G01N11/00
Inventor 李朋朋梁天珍王美玲谢昕刘敏樊洁魏福庆刘永军杨世元王卓妮许惠芳邓守军金鼎铭
Owner PETROCHINA CO LTD
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