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Measurement method of polypropylene powder melt index

A measurement method and technology of polypropylene powder, which is applied in the field of polypropylene production, can solve problems such as deviation of measurement results, easy oxidation of polypropylene powder, uneven mixing of antioxidants and powder, etc., and achieve good repeatability and parallelism , the effect of easy operation

Inactive Publication Date: 2012-07-18
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a method for measuring the melt index of polypropylene powder to solve the problems in the prior art that polypropylene powder is easily oxidized at high temperature, and the mixing of antioxidants and powder is not uniform, which makes the measurement results deviate

Method used

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  • Measurement method of polypropylene powder melt index

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The polypropylene powder is pretreated: take 1.200 grams of tris[2.4-di-tert-butylphenyl] phosphite, 1.200 grams of 1,3,5-trimethyl-2,4,6-tris(3, 5-di-tert-butyl-4-hydroxybenzyl) benzene, 0.0600 g of zinc oxide and 20 g of grade L5E89 polypropylene powder are placed in a watch glass filled with 15 ml of ethanol, stirred clockwise for 30 seconds, then counterclockwise Stir clockwise for 30 seconds, repeat the above operation 30 times, then put the mixture into a vacuum drying oven, and dry under vacuum at 125° C. for 15 minutes. The obtained sample is sample 1.

[0037] Operation of the melt index instrument Repeat the operation of Comparative Example 1. The test results are shown in Table 1.

Embodiment 2

[0039] Carry out pretreatment to polypropylene powder: take 0.1200 grams of tris[2.4-di-tert-butylphenyl] phosphite, 0.1200 grams of 1,3,5-trimethyl-2,4,6-tris(3, 5-di-tert-butyl-4-hydroxybenzyl)benzene and 0.0600 grams of zinc oxide in 10 milliliters of ethanol in a watch glass, stir with a stir bar for 60 seconds to obtain a mixed solution of additives and ethanol, to which 20g of the brand name is added For L5E89 polypropylene powder, stir clockwise for 30 seconds, then counterclockwise for 30 seconds, repeat the above operation 25 times, put the mixture into a vacuum drying oven, and dry it under vacuum at 125°C for 15 minutes . The obtained sample is sample 2.

[0040] Operation of the melt index instrument Repeat the operation of Comparative Example 1. The test results are shown in Table 1.

Embodiment 3

[0042] Carry out pretreatment to polypropylene powder: take 0.1200 grams of tris[2.4-di-tert-butylphenyl] phosphite, 0.1200 grams of 1,3,5-trimethyl-2,4,6-tris(3, 5-di-tert-butyl-4-hydroxybenzyl) benzene and 0.0600 gram of zinc oxide in 10 milliliters of isopropanol in watch glass, obtain the mixed solution of additive and isopropanol after stirring with a stirring bar for 40 seconds, to Add 15g of polypropylene powder with grade L5E89, stir clockwise for 20 seconds, then counterclockwise for 20 seconds, repeat the above operation 40 times, put the mixture into a vacuum drying oven, and put it in a vacuum state at 125°C Let dry for 15 minutes. The obtained sample is sample 3.

[0043] Operation of the melt index instrument Repeat the operation of Comparative Example 1. The test results are shown in Table 1.

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Abstract

The invention discloses a measurement method of polypropylene powder melt index, comprising the following steps of: dissolving an additive and polypropylene powder in a solvent according to the proportion so as to form a mixture A; stirring the mixture A to evaporate the solvent, so as to form a mixture B; drying the mixture B, so as to form a sample to be measured; and measuring the sample by using a melt index instrument. The technical scheme of the invention fully plays the anti-oxidant role, so as to prevent the polypropylene powder from being oxidized, the operation of the mixing process is convenient and during the measurement process using the melt index instrument, the data reproducibility and data parallelism are relatively good.

Description

technical field [0001] The invention relates to the field of polypropylene production, in particular to a method for measuring the melt index of polypropylene powder. Background technique [0002] Melt index, or melt flow rate, refers to the amount of melt that passes through a standard die within ten minutes under a certain temperature and pressure load using a special measuring instrument. The melt index is directly related to the average molecular weight of the polymer. The larger the molecular weight, the smaller the melt index. Conversely, the smaller the molecular weight, the larger the melt index. Melt index is generally used as the first data index for classifying high molecular polymer grades, and it is also an important index for determining the specific use of high molecular polymers. Therefore, it is of great significance to accurately determine the melt index to determine the physical quality and practical use. [0003] For a long time, the determination of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/04G01N1/38
Inventor 徐颖刘文星田玉洁魏喜云
Owner CHNA ENERGY INVESTMENT CORP LTD