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Polypropylene composite material with high strength and toughness and preparation method thereof

A high-toughness polypropylene and composite material technology, applied in the field of polypropylene materials and preparation, can solve problems such as rigidity reduction, and achieve the effects of improved toughness, easy control, and cost reduction

Inactive Publication Date: 2010-07-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method adopts the methods of multi-component blending, synergistic toughening of inorganic rigid particles and organic rigid polymers, and glass fiber reinforcement, so that the impact strength of the composite material can be greatly improved while maintaining good rigidity, thereby overcoming only Disadvantages of using elastomer tougheners to increase the impact strength while reducing the rigidity of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 140 g of BaSO with a particle size of 20 μm 4 , 90 grams of maleic anhydride grafted polypropylene (PP-g-MAH), 10 grams of N, N'-diethylene stearic acid amide dried at 60°C in a vacuum oven, then stirred at 40°C for 15 Minutes to obtain the treated barium sulfate; then the processed barium sulfate is 1g / 10min copolymerized polypropylene with 200 grams of melt index, 80 grams of melt index is the homopolypropylene of 20g / 10min, 400 grams of molecular weight is 30000 engineering plastics grade polycaprolactam, 10 grams of tris (2,4-di-tert-butylphenyl) phosphite and β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecanoic acid Carbon alcohol ester is mixed evenly with the antioxidant of 1.5: 1 composition in molar ratio, carries out melt blending and extruding in twin-screw extruder, imports 70 grams of glass fibers (E type glass fibers) in screw rod midsection, extruder material The barrel temperature is 180-250°C, the main screw speed is fixed at 150 rpm, the feeding screw s...

Embodiment 2

[0039] 140 g of BaSO with a particle size of 50 μm 4 , 90 grams of maleic anhydride grafted polypropylene (PP-g-MAH), 10 grams of N, N'-diethylene stearic acid amide dried at 30°C in a vacuum oven, then stirred at 100°C for 5 Minutes, obtain the treated barium sulfate; Then with the processed barium sulfate and 418 grams of melt index is 3g / 10min copolymerized polypropylene, 167 grams of melt index is the homopolypropylene of 30g / 10min, 100 gram molecular weight is 30000 engineering plastics grade polycaprolactam, 5 grams of tris (2,4-di-tert-butylphenyl) phosphite and β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecanoic acid The antioxidant composed of carbon alcohol ester with a molar ratio of 2.5:1 is mixed evenly, melted and blended and extruded in a twin-screw extruder, and 70 grams of glass fiber is introduced into the middle of the screw, and the barrel temperature of the extruder is 180-250°C , fixed the speed of the main screw at 150 rpm, the speed of the feeding screw...

Embodiment 3

[0047] 140 g of BaSO with a particle size of 40 μm 4 , 90 grams of maleic anhydride grafted polypropylene (PP-g-MAH), 10 grams of N, N'-diethylene stearic acid amide dried at 80°C in a vacuum oven, then stirred at 75°C for 10 Minutes to obtain the treated barium sulfate; then the processed barium sulfate is 2g / 10min copolymerized polypropylene with 307 grams of melt index, 123 grams of melt index is the homopolypropylene of 25g / 10min, 253 grams of molecular weight is 30000 engineering plastic grade polycaprolactam, 7 grams of tris (2,4-di-tert-butylphenyl) phosphite and β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecanoic acid The carbon alcohol ester is mixed evenly with the antioxidant composed of 2:1 molar ratio, melt blending and extruding in the twin-screw extruder, and 70 grams of glass fiber is introduced into the middle of the screw, and the barrel temperature of the extruder is 180-250°C , fixed the speed of the main screw at 150 rpm, the speed of the feeding screw at ...

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Abstract

The invention discloses a polypropylene composite material with high strength and toughness and a preparation method thereof. The composite material comprises the following components in parts by weight: 28-58.5 parts of polypropylene, 10-40 parts of polycaprolactam, 14 parts of barium sulphate, 7 parts of glass fiber, 9 parts of compatilizer, 1 part of lubricant and 0.5-1 part of antioxidant; and the preparation method is as follow: drying the barium sulphate, the lubricant and the compatilizer, stirring at the temperature of 40-100 DEG C, evenly mixing the processed barium sulphate, polypropylene and polycaprolactam, performing melt blending by a double-screw extruder, introducing the glass fiber in the middle section of a screw, extruding, drawing and pelleting. The polypropylene has higher flexural modulus, tensile strength and impact strength which are endowed from the synergic toughness-strength enhancement effect of the inorganic rigid particle barium sulphate and the organic rigid resin polycaprolactam and the strength enhancement effect of the glass fiber, thus the composite material can be used as a plastic structure part.

Description

technical field [0001] The invention relates to a polypropylene material and a preparation method, in particular to a high-strength and high-toughness polypropylene composite material and a preparation method thereof Background technique [0002] The toughening and strengthening modification of polymers has always been an important topic in polymer material science. The purpose of strengthening is to increase the modulus, and the purpose of toughening is to improve the impact strength. However, the two are often contradictory to each other, so that the material has both High modulus and high impact strength is a subject of great scientific and technological significance and application value. Polypropylene (PP) is a general-purpose plastic with excellent comprehensive properties. It has excellent corrosion resistance and folding resistance, and is rich in sources and easy to form and process. In recent years, the rapid development of the automobile industry and the extensiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08L23/12C08L23/08C08L77/02C08L51/06C08K13/06C08K3/30C08K7/14
Inventor 吴水珠李国林曾钫赵建青
Owner SOUTH CHINA UNIV OF TECH
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