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A quality detection method for polypropylene special material

A quality inspection method and polypropylene technology, which can be used in analytical materials, measuring devices, material separation, etc., and can solve the problems of inaccurate qualitative analysis, difficult industrial application, and complex quantitative analysis.

Active Publication Date: 2019-10-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a quality detection method for polypropylene special materials to overcome the defects of inaccurate qualitative analysis of polypropylene special materials, complicated quantitative analysis and difficulty in industrial application in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Mix the polypropylene base material, peroxide degradation agent, and compound inhibitor package uniformly by weight 100:0.8:1.6, extrude and granulate in a twin-screw extruder at 160°C, and the polypropylene base powder melt flows The rate is 5g / 10min, the isotactic index is 96%, the peroxide degradation agent is 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (DHBP), and the load at 230°C is The melt flow rate MFR1 of the obtained polypropylene product is 180g / 10min at 5kg, and the MFR2 is 50g / 10min at 230°C when the load is 2.16kg. The available distribution index n is 1.33. At the same time, headspace chromatography was used for the polypropylene product pellets, sampling at 150°C for 4 hours, and the measured volatile content in the product was about 150ppm. There is no abnormal smell during processing and spinning, and the product performance is stable. Among them, the composite inhibitor is composed of hindered phenolic antioxidant 2,6-bis(octadecyl)-4-methylphenol...

Embodiment 2

[0037] The polypropylene base material, peroxide degradation agent, and composite inhibitor package are uniformly mixed by weight 100:0.5:2.0, extruded and pelletized in a twin-screw extruder at 240°C, and the melt flow rate of the polypropylene base powder is 10g / 10min, isotactic index 96.5%, peroxide degradation agent is 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-tripperoxynonane (TPO ), the melt flow rate MFR1 of the obtained polypropylene product is 185g / 10min when the load is 5kg at 230°C, and the MFR2 is 51.2g / 10min when the load is 2.16kg at 230°C. The available distribution index n is 1.32. At the same time, headspace chromatography was used for polypropylene product pellets, sampling at 150°C for 4 hours, and the measured volatile content in the product was about 123ppm. During the processing and spinning process, there was no abnormal smell, and the product performance was stable. Wherein, the composite inhibitor is formed by mixing styrenated phenol / phosphite A / antistati...

Embodiment 3

[0039] Mix the polypropylene base material, peroxide degradation agent, and compound inhibitor package uniformly by weight 100:1:1, extrude and pelletize in a twin-screw extruder at 200°C, and the melt flow rate of the polypropylene base powder is 2g / 10min, isotactic index 98.0%, peroxide degradation agent is 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (DHBP), and the load is 5kg at 230°C The melt flow rate MFR1 of the obtained polypropylene product is 135g / 10min, and the MFR2 is 35g / 10min when the load is 2.16kg at 230°C. The available distribution index n is 1.37. At the same time, headspace chromatography was used for polypropylene product pellets, sampling at 150°C for 4 hours, and the measured volatile content in the product was about 162ppm. During the processing and spinning process, there was no abnormal smell, and the product performance was stable. Wherein, the composite inhibitor is composed of 2,2'-methylenebis(4-ethyl-6-tert-butylphenol) / 2,2'-ethylenebis(4,6-di-...

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Abstract

The invention discloses a quality detection method for special propylene material, comprising the specific steps of (1) measuring melt-mass flow rate MFR1 when the special propylene material has a load of 5 kg; (2) measuring melt-mass flow rate MFR2 when the special propylene material has a load of 2.16 kg; and (3) calculating distribution index n, i.e., lg MFR1 / LG MFR2, wherein the special propylene material is prepared by using the controllable rheological method. The quality detection method for the special propylene material has the advantages of good simplicity and high speed; a quantitative analytical method is provided for detecting the odor of the special propylene material prepared by using the controllable rheological method, and the method is applicable to the quality control in industrial amplified production.

Description

technical field [0001] The invention relates to a quality detection method for polypropylene special materials, in particular to a quality detection method for preparing polypropylene special materials through a controllable rheological method. Background technique [0002] High melt flow rate polypropylene is widely used in non-woven fabrics, carpets, artificial turf, decorative fabrics and other industries. There are two main production methods for high melt flow rate polypropylene: hydrogen conditioning method and controlled rheology method. Hydrogen-modulated products can effectively reduce the odor of the product, but when producing polypropylene with a high melt flow rate, the amount of hydrogen added is limited by the reactor, and the operation is difficult, and the molecular weight distribution of polypropylene produced by hydrogen-modulated method is relatively low. Wide, not conducive to the processing and application of fiber materials. The polypropylene materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08K13/02C08K5/14C08K5/13C08K5/526C08K5/098C08K5/103C08K5/25C08K5/524C08K3/26G01N30/02
Inventor 黄强王艳芳陈商涛张凤波陈兴锋李思博张友军姜凯何勇胡于中石行波黄伟欢
Owner PETROCHINA CO LTD
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