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High-melt index polypropylene composition and preparation method thereof

A polypropylene composition and polypropylene technology are applied in the field of high melting index polypropylene composition and its preparation, which can solve the problems of difficulty in control, large fluctuation of the melting index of polypropylene resin, etc., so as to improve transparency and appearance. performance, the effect of increasing the number of nuclei

Active Publication Date: 2014-02-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method has two disadvantages: the melt index of polypropylene resin fluctuates greatly, it is not easy to control, and the peroxide is explosive.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Mix 100 parts of homopolypropylene (melt index 2.5g / 10min, isotacticity ≥ 97%), 13 parts of peroxide masterbatch, and 1.0 part of nucleating agent masterbatch in a high-speed mixer at medium speed for 3 minutes, Through twin-screw extruder melt extrusion granulation, the temperature of each section of twin-screw extruder is 170°C-190°C-200°C-210°C-220°C-220°C-220°C-210°C-200°C, the screw speed It is 200rpm, and the feeding speed is 8.0rpm.

[0051] The nucleating agent masterbatch formula is as follows: 90 parts of homopolypropylene powder (melt index 2.5g / 10min, isotacticity ≥ 97%), 10 parts of nucleating agent (TMP-5 produced by Shanxi Chemical Research Institute), 0.1 part of 1010 primary antioxidant, 0.1 part of 168 auxiliary antioxidant, 0.1 part of calcium stearate stabilizer. The temperature of each section of the twin-screw extruder is 170°C-190°C-200°C-210°C-220°C-220°C-220°C-210°C-200°C, the screw speed is 200 rpm, and the feed speed is 8.0 rpm.

[0052] The...

Embodiment 2

[0056] Replace 1.0 parts of the nucleating agent masterbatch in Example 1 with 1.5 parts, and the others are the same as in Example 1, granulate through a twin-screw extruder, and the temperature of each section of the twin-screw extruder is 170°C-190°C-200°C -210°C-220°C-220°C-220°C-210°C-200°C, the screw speed is 200rpm, and the feeding speed is 8.0rpm.

[0057] The results of polypropylene resin pelletized by twin-screw extruder are as follows: the melt flow rate is 62 g / 10min, the tensile strength is 36.6MPa, the flexural modulus is 1703MPa, the hardness is 104, and the heat distortion temperature is 111°C .

Embodiment 3

[0059] Replace 1.0 parts of the nucleating agent masterbatch in Example 1 with 2.0 parts, and the others are the same as in Example 1, granulate through a twin-screw extruder, and the temperature of each section of the twin-screw extruder is 170°C-190°C-200°C -210°C-220°C-220°C-220°C-210°C-200°C, the screw speed is 200rpm, and the feeding speed is 8.0rpm.

[0060] The results of polypropylene resin pelletized by twin-screw extruder are as follows: the melt flow rate is 60 g / 10min, the tensile strength is 36.9MPa, the flexural modulus is 1726MPa, the hardness is 106, and the heat distortion temperature is 114°C .

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Abstract

The invention discloses a high-melt index polypropylene composition comprising following ingredients, by weight, 100 parts of polypropylene, 13 to 21 parts of a peroxide master batch, and 1.0 to 2.0 parts of a nucleating agent master batch. The melt index of the high-melt index polypropylene composition ranges from 0.2 to 4g / 10min. The peroxide master batch comprises, by weight, 98 to 99 parts of polypropylene powder and 1.0 to 2.0 parts of a peroxide; the peroxide is a tert-butyl peroxide or 2, 5-dimethyl-2, 5-Di-(tert-butylperoxy) hexane; the nucleating agent master batch comprises, by weight, 90 parts of polypropylene powder, 10 parts of a nucleating agent, 0.1 part of a main anti-oxidant, 0.1 part of an auxiliary anti-oxidant and 0.1 part of a stabilizing agent; the nucleating agent is a rigid nucleating agent selected from TMP-5 or NAP-71, the main anti-oxidant is pentaerythrite tetra [beta-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate or octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; and the auxiliary anti-oxidant is 2, 4-bis(1, 1-dimethylethyl)-phenophosphite(3:1). The preparation method comprises following steps: the ingredients are mixed at a certain ratio; the mixture is subjected to blend extrusion using a double screw extruder (length-diameter ratio 40, and screw diameter 35cm) at a temperature of 170 to 220 DEG C; and the obtained product is cooled, and subjected to granulation so as to obtain the high-melt index high-performance polypropylene resin.

Description

technical field [0001] The invention relates to a high melting point polypropylene composition and a preparation method thereof. Background technique [0002] High melting point polypropylene has both high melt flow rate and good mechanical properties, which can make the design of large and thin-walled injection molded products with complex structures feasible; in the production process, the processing and molding cycle can be shortened, and the processing temperature and injection pressure can be reduced It has the advantages of good processing performance, easy mold filling and small warping deformation of products. Co-polypropylene resins with a melt index of 35g / 10min, 65g / 10min and 100g / 10min were used to inject thin-walled food packaging containers with a wall thickness of 0.036cm. It was found that the injection temperature of the resin with a melt index of 100g / 10min was 210°C ( body temperature is 220°C), the injection temperature of 65g / 10min resin needs to be 228...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/14C08L53/00C08K5/14C08K5/134C08K5/526C08J3/22
CPCC08J3/226C08J2323/12C08J2323/14C08J2353/00C08J2423/12C08J2423/14C08J2453/00C08L23/12C08L23/14C08L53/00C08L2201/08C08L2205/025C08L2205/03C08K5/00C08K5/14
Inventor 邱敦瑞徐振明傅勇
Owner CHINA PETROLEUM & CHEM CORP
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