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Method for extruding and preparing maleation polypropylene by supercritical reaction

A reactive extrusion and supercritical technology, applied in the field of preparing maleated polypropylene and supercritical reactive extrusion for preparing maleated polypropylene, can solve problems such as low grafting efficiency, achieve high product purity, inhibit degradation, The effect of improving grafting efficiency

Inactive Publication Date: 2008-03-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of main chain degradation and low grafting efficiency under the existing industrial technical conditions, and provide a method for preparing maleated polypropylene by supercritical reaction extrusion, so as to realize grafting in polypropylene melt Improving the grafting rate and grafting efficiency while inhibiting degradation in the chemical reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 100 parts of polypropylene, 1 part of maleic acid, 1 part of compound additive of styrene and 2,6-tert-butyl-4-methylphenol, 6 parts of azobisisobutyronitrile initiator, mix completely Cylinder feeding, using a twin-screw extruder with L / D of 24:1, injecting into the reaction system 0.5% supercritical CO 2 Fluid, the speed of the main screw of the extruder is 600 rpm, divided into 2 heating zones, the temperature of the first heating zone is 220°C, the temperature of the second heating zone is 190°C, and the reaction is for 1 minute. Its properties are reported in Table 1.

Embodiment 2

[0030] Take 100 parts of polypropylene, 2 parts of maleic anhydride, 0.5 parts of 3,5-di-tert-butyl-4-hydroxyphenylpropionate stearyl, calcium stearate and calcium carbonate compound additives, mix them completely and feed them from the barrel Material, 0.6 part of dicumyl peroxide initiator is diluted into 20% solution with ethanol, adds in the reaction system from the side of screw extruder, adopts L / D to be the twin-screw extruder of 36: 1, to 5% of the total mass of reactants is injected into the reaction system with supercritical CO 2 Fluid, the speed of the main screw of the extruder is 150 rpm, divided into 2 heating zones, the temperature of the first heating zone is 180°C, the temperature of the second heating zone is 160°C, and the reaction is for 4 minutes. The obtained extruded product is granulated and then tested for performance , and its properties are reported in Table 1.

Embodiment 3

[0032] Take 100 parts of polypropylene, feed from the barrel, add 15 parts of glycidyl methacrylate, 3 parts of diatomaceous earth and calcium carbonate compound additives and 1 part of 2,5-dimethyl-2,5-di Tertiary butyl peroxide n-hexane initiator is diluted to 80% solution with ethanol acetone mixed solvent, adds in the reaction system from the side of screw extruder, adopts L / D to be the single screw extruder of 48: 1, to The injection mass accounts for 2% supercritical CO of the total mass of the reactants in the reaction system 2 Fluid, the speed of the main screw of the extruder is 50 rpm, divided into 3 heating zones, the temperature of the first heating zone is 200°C, the temperature of the second heating zone is 180°C, the temperature of the third heating zone is 170°C, and the reaction is 20 minutes, and the obtained extruded After the product is granulated, the performance test is carried out, and its performance is recorded in Table 1.

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Abstract

The invention discloses a method for preparing maleic polypropylene by supercritical reaction extrusion, wherein polypropylene, maleic series, additives and initiators are added into a screw extruder, and supercritical CO2 is injected into the system by a supercritical generation device, which makes up 0.1-20 percent of the total mass of reactant; the rotating speed of main screwed pole of the extruder is 50-600 rpm, and the extruder is divided into a plurality of heating areas, the temperature of the firs area is 180-220 DEG C, and the temperature of the other areas is 140-200 DEG C and the reaction time is 1-20 min. The grafting rate of maleic polypropylene prepared by the invention, with high grafting rate and grafting efficiency, can reach up to 1.2 percent, the grafting efficiency can reach up to 90 percent and the melt flow rate is adjustable within 5-50g / 10min. The method of the invention is suitable for continuous production and has low energy consumption, and is environment-friendly. The product shows superiority in color, uniformity, processing property and mechanical property and so on, which is suitable for the fields of polymer compatilizer, adhesive and surface coating etc.

Description

technical field [0001] The invention relates to a method for preparing maleated polypropylene, in particular to a method for preparing maleated polypropylene by supercritical reaction extrusion, and belongs to the technical field of polymer materials. Background technique [0002] Polypropylene (PP) is the fastest growing general purpose resin in the polymer segment. Due to its linear chain non-polar molecular structure, resulting in narrow molecular weight distribution and low melt strength, its hydrophilicity, adhesion and group reactivity are not ideal, and it is difficult to blend and compound with polar polymers or fillers , limiting its scope of application. [0003] In order to improve this performance, the modification method of grafting polar groups on the main chain is often used to polarize the grafted product, and the research on grafted maleic anhydride is the most extensive. Traditional grafting methods include solution grafting, suspension grafting, solid ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/10C08J7/14B29C47/92B29B9/12C08K5/524C08K3/00C08K5/09B29C48/92
CPCB29C48/9185B29C48/04B29C48/92B29C2948/92561B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 姚臻曹堃曲邦威沈之丞陆湛泉
Owner ZHEJIANG UNIV
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