Method for improving thermal degradation capacity of maleic anhydride grafted polypropylene plastic

A technique of grafting polypropylene and maleic anhydride, which is applied in the field of physical modification of maleic anhydride grafted polypropylene, can solve the problems of less active groups and poor blending compatibility, achieve low cost and improve crystallinity And the effect of crystallization ability and easy operation

Active Publication Date: 2014-06-25
浙江诺瓦新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the molecular chain of maleic anhydride-modified polypropylene is relatively regular and there are fewer active groups, the blending compatibility of the two is poor, so that the lignin is simply dispersed on the polypropylene matrix.

Method used

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  • Method for improving thermal degradation capacity of maleic anhydride grafted polypropylene plastic
  • Method for improving thermal degradation capacity of maleic anhydride grafted polypropylene plastic
  • Method for improving thermal degradation capacity of maleic anhydride grafted polypropylene plastic

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The lignin and maleic anhydride were grafted and modified according to the mass ratio of 95:5, the reaction solvent was acetic acid, and the reaction was carried out at 30°C for 30 minutes, washed with distilled water for 3 times and then dried to obtain the modified lignin after esterification. The modified lignin and maleic anhydride grafted polypropylene were mixed evenly in a high-speed mixer at a mass ratio of 10:90, and the mixed materials were melt-blended in a micro-blender at 180°C to obtain a uniformly mixed blend. Mixture; put the above blend into the feed hopper of the micro-injection molding machine and melt it at 190°C, and inject the mixture melt into the dumbbell-shaped mold under the pressure of the injection molding machine. A dumbbell-shaped blended spline is obtained. Among them, the crystallization performance of the blended spline is improved, the crystallinity is 50.3%, the thermal stability in nitrogen is improved, and the residual rate (12.73%) ...

Embodiment 2

[0026] The lignin and maleic anhydride were grafted and modified according to the mass ratio of 95:5, the reaction solvent was acetic acid, and the reaction was carried out at 30°C for 30 minutes, washed with distilled water for 3 times and then dried to obtain the modified lignin after esterification. The modified lignin and maleic anhydride-grafted polypropylene were mixed evenly in a high-speed mixer at a mass ratio of 15:85, and the mixed materials were melt-blended in a micro-blender at 185°C to obtain a well-mixed blend Mixture; put the above blend into the feed hopper of the micro-injection molding machine and melt it at 190°C, and inject the mixture melt into the dumbbell-shaped mold under the pressure of the injection molding machine. A dumbbell-shaped blended spline is obtained. Among them, the crystallization performance of the blended spline is improved, the crystallinity is 53.1%, the thermal stability in nitrogen is improved, and the residual rate (13.24%) in the...

Embodiment 3

[0028] The lignin and maleic anhydride were grafted and modified according to the mass ratio of 90:10, the reaction solvent was acetic acid, and the reaction was carried out at 30° C. for 40 minutes, washed with distilled water for 3 times and then dried to obtain the modified lignin after esterification. The modified lignin and maleic anhydride-grafted polypropylene were mixed evenly in a high-speed mixer at a mass ratio of 10:90, and the mixed materials were melt-blended in a micro-blender at 175°C to obtain a well-mixed blend Mixture; put the above blend into the feed hopper of the micro-injection molding machine and melt it at 185°C, and inject the mixture melt into the dumbbell-shaped mold under the pressure of the injection molding machine. A dumbbell-shaped blended spline is obtained. Among them, the crystallization performance of the blended spline is improved, the crystallinity is 53.6%, the thermal stability in nitrogen is improved, and the residual rate (13.62%) in ...

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Abstract

The invention relates to a method for improving the thermal degradation capacity of maleic anhydride grafted polypropylene plastic. The method comprises the following steps: (1) carrying out graft modification on lignin and maleic anhydride, so as to obtain esterified modified lignin; (2) uniformly mixing the modified lignin with maleic anhydride grafted polypropylene, and carrying out melt blending on the mixed material at 150-240 DEG C, so as to obtain uniform-blended blends; and (3) melting the blends at 170-230 DEG C, jetting the obtained mixture melt into a mold, and cooling to obtain a blended sample strip. The method has the beneficial effects that the process is simple, the operation is convenient, the cost is low, and the heat resistance of a composite material can be improved due to the influence of a three-dimensional network structure of the lignin; and meanwhile, the crystallization degree and capacity of the polypropylene can be improved by virtue of the modified lignin, the thermal degradation capacity of the polypropylene is greatly improved, the service life of the polypropylene plastic is prolonged, and the method can be industrially generalized.

Description

technical field [0001] The invention belongs to the field of physical modification of maleic anhydride grafted polypropylene, in particular to a method for improving thermal degradation ability of maleic anhydride grafted polypropylene plastic. Background technique [0002] Polypropylene is a thermoplastic resin obtained by the polymerization of propylene. It has three configurations: isotactic, random and syndiotactic. Industrial products use isotactic as the main component. Usually, a certain amount of maleic anhydride is added to polypropylene during the polymerization process for copolymerization modification, so as to improve the processing performance and responsiveness of polypropylene. The melting temperature of polypropylene is about 180°C, and the density is about 0.91g / cm 3 , is the lightest general-purpose plastic, has the advantages of high strength, high hardness, wear resistance, bending fatigue resistance, corrosion resistance, and easy processing and moldin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/06C08L51/00C08F289/00
Inventor 余木火陈磊刘淑萍韩克清郑颖王海风张文辉张静洁
Owner 浙江诺瓦新材料有限公司
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