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Low-linear-expansion-coefficient polypropylene composite and preparation method thereof

A low linear expansion, polypropylene technology, applied in the direction of the bumper, etc., can solve the problems of material density increase, toughness decrease, etc., to achieve the effect of reducing the linear expansion coefficient, avoiding damage, and simple process control

Active Publication Date: 2012-06-20
JIANGSU KINGFA SCI & TECH ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reduction of the linear expansion coefficient of polypropylene materials for automobile bumpers is usually solved by adding talc powder, but to achieve a low linear expansion coefficient, a large amount of talc powder needs to be added, which will cause a sharp increase in the density of the material and a decrease in toughness. decline

Method used

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  • Low-linear-expansion-coefficient polypropylene composite and preparation method thereof
  • Low-linear-expansion-coefficient polypropylene composite and preparation method thereof
  • Low-linear-expansion-coefficient polypropylene composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 82 kg of polypropylene, 0.5 kg of phenolic heat stabilizer Irganox 1010 (CIBA company), 0.5 kg of lubricant calcium stearate, 5 kg of toughening agent ethylene propylene rubber, 2 kg of interface compatibilizer polypropylene grafted Malay Acid anhydride, 5 kg of acicular wollastonite and 5 kg of powdered wollastonite were melt mixed and dispersed in a twin-screw extruder with an aspect ratio of 40:1, extruded and granulated to obtain the polypropylene compound of this example. The wollastonite is fed into the extruder by side feeding, and the processing temperature is 200°C.

[0031] The performance of the polypropylene composite obtained in the present embodiment is as follows:

[0032]

Embodiment 2

[0034] 66 kg of polypropylene, 0.5 kg of phenolic heat stabilizer Irganox 1010 (CIBA company), 0.5 kg of lubricant calcium stearate, 15 kg of toughening agent ethylene-octene copolymer, 3 kg of interface compatibilizer polypropylene Branched maleic anhydride, 10 kg of acicular wollastonite and 5 kg of powdered wollastonite were melt mixed and dispersed in a twin-screw extruder with a length-to-diameter ratio of 40:1, extruded and granulated to obtain the polypropylene of this embodiment Complex. The wollastonite is fed into the extruder by side feeding, and the processing temperature is 200°C.

[0035] The performance of the polypropylene composite obtained in the present embodiment is as follows:

[0036]

Embodiment 3

[0038] 65 kg of polypropylene, 0.5 kg of phenolic heat stabilizer Irganox 1010 (CIBA company), 0.5 kg of lubricant calcium stearate, 18 kg of toughening agent ethylene propylene rubber, 1 kg of interface compatibilizer polypropylene grafted Malay Acid anhydride, 5 kg of acicular wollastonite and 10 kg of powdered wollastonite were melt mixed and dispersed in a twin-screw extruder with an aspect ratio of 40:1, extruded and granulated to obtain the polypropylene compound of this example. The wollastonite is fed into the extruder by side feeding, and the processing temperature is 200°C.

[0039] The performance of the polypropylene composite obtained in the present embodiment is as follows:

[0040]

[0041] From the above examples, it can be concluded that the polypropylene compound of the present invention has a very low coefficient of linear expansion (≤4.0×10 -5 ), good heat resistance and excellent rigidity-toughness balance.

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Abstract

The invention relates to a low-linear-expansion-coefficient polypropylene composite, which comprises: 53 to 95 weight percent of polypropylene, 0 to 1 weight percent of heat stabilizer, 0 to 1 weight percent of lubricating agent, 0 to 20 weight percent of toughening agent, 0 to 5 weight percent of interface compatibilizer and 5 to 20 weight percent of wollastonite, wherein the wollastonite is prepared by mixing needle-like wollastonite with a length-diameter ratio of 10 to 30 and powder wollastonite with a length-diameter ratio of less than or equal to 5 according to a ratio of 1 / 4 to 4. The invention also discloses the preparation method of the polypropylene composite, which comprises: adding wollastonite into an extruder in a side feeding form from a side feed inlet and performing extrusion processing. The method can prevent the special structure of the wollastonite from being damaged due to long-time blending and make process control simple and material performance guaranteed easily. Compared with the conventional polypropylene material for automobile bumpers, the polypropylene composite prepared by the method has very low linear expansion coefficient (less than or equal to 4.0*10<-5>) and has very high heat resistance and high rigidity and toughness balancing performance.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a polypropylene compound with a low linear expansion coefficient suitable as an automobile bumper material and a preparation method thereof. Background technique [0002] Due to the low price of polypropylene materials, most cars now use polypropylene composite materials for exterior trim. Because the automobile bumper is in the high and low temperature alternating environment for a long time, it must ensure an extremely low linear expansion coefficient. The reduction of the linear expansion coefficient of polypropylene materials for automobile bumpers is usually solved by adding talcum powder, but to achieve a low linear expansion coefficient, a large amount of talcum powder needs to be added, which will cause a sharp increase in the density of the material and a decrease in toughness. decline. At present, the linear expansion coefficient of polypropylene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/16C08K13/04C08K7/10C08K3/34B29B9/06B29C47/92B60R19/03B29C48/92
CPCB29C48/625B29C48/92
Inventor 孙刚李欣陈延安李国明程文超李志平周英辉丁超罗忠富
Owner JIANGSU KINGFA SCI & TECH ADVANCED MATERIALS CO LTD
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