Stress-whitening-resisting glass fiber reinforced polypropylene composite and preparation method thereof

A technology of anti-stress whitening and polypropylene, which is applied in the field of polymer materials, can solve the problems of molecular chain breakage and slippage, affect the appearance of interior parts, cracks, silver streaks and holes, etc., to reduce breakage and slippage , Increase rigidity, reduce stress whitening effect

Inactive Publication Date: 2013-02-13
SHANGHAI KINGFA SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the matrix resin of automotive door panels, pillars and instrument panels and other interior materials is mainly made of polypropylene, the reinforcing filler is made of talcum powder, and the toughening rubber is made of ethylene octene copolymer (POE) thermoplastic elastomer, which is prepared by blending with a twin-screw extruder , this material has excellent toughness and processing performance, but it is easy to cause molecular chain breakage and slippage due to force during injection molding, ejection, demoulding and assembly, resulting in microscopic cracks, silver streaks and cavities in the stressed area of ​​the material , so that the refractive index of the stressed area changes, which is manifested in the macroscopic phenomenon of whitening of the stressed area, which affects the appearance of interior parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The first step: 82 kg of polypropylene PP7033N (melt flow rate is 8g / 10min), 0.1 kg of phenolic heat stabilizer 1010, 0.1 kg of phosphite heat stabilizer 168, 0.3 kg of processing aid EBS, 0.2 kg Hindered amine light stabilizer 770, 0.3 kg polypropylene special nucleating agent TMP-5, 5 kg ethylene octene copolymer POE LC670, 2 kg maleic anhydride grafted polypropylene CA-100, 5 kg 3000 mesh talcum powder The high mixer is fully mixed;

[0035] The second step: the mixture obtained in the first step is delivered to a twin-screw extruder with a length-to-diameter ratio of 30:1 at a rate of 95 kg / hour, melted and dispersed, and the rotating speed is 200r / min, from the feeding section to the extruder The temperature of each zone of the head is set to 140°C, 200°C, 200°C, 200°C, and 200°C; at the same time, 5 kg of Chongqing International chopped alkali-free glass fiber is 305K, and the chopped glass fiber is passed through the weight loss weighing scale from the side feedi...

Embodiment 2

[0039] The first step: 61.5 kg of polypropylene PP K9017 (melt flow rate is 17g / 10min), 0.5 kg of phenolic heat stabilizer 1010, 0.5 kg of phosphite heat stabilizer 168, 0.5 kg of processing aid A-C540A , 0.5 kg hindered amine light stabilizer 944, 0.5 kg polypropylene special nucleating agent HPN-20E, 12 kg ethylene octene copolymer POE5062, 4 kg maleic anhydride grafted polypropylene Bondyram1001CN, 10 kg 5000 mesh talcum powder The high mixer is fully mixed;

[0040] The second step: the mixture obtained in the first step is transported to a twin-screw extruder with a length-to-diameter ratio of 40:1 at a rate of 90 kg / hour for melting and dispersion, and the rotating speed is 220r / min, from the feeding section to the die The temperature of each zone is set to 140°C, 200°C, 210°C, 220°C, and 200°C; at the same time, 10 kg of Zhejiang Jushi chopped alkali-free glass fiber 508A, and the chopped glass fiber is fed from the side feeding port by 10 kg through a weight-loss weigh...

Embodiment 3

[0045] The first step: 47 kg of polypropylene PP K9026 (melt flow rate is 22g / 10min), 1 kg of phenolic heat stabilizer 1010, 1 kg of phosphite heat stabilizer 627A, 1 kg of processing aid stearic acid Zinc, 1 kg of hindered amine light stabilizer 622, 1 kg of special nucleating agent HTPUTRA5 for polypropylene, 16 kg of ethylene octene copolymer POE8130, 7 kg of maleic anhydride grafted polypropylene Bondyram1001, 15 kg of 3000 mesh talcum powder The mixer is fully mixed;

[0046]The second step: the mixture obtained in the first step is transported to a twin-screw extruder with a length-to-diameter ratio of 40:1 at a rate of 90 kg / hour for melting and dispersion, and the rotating speed is 240r / min, from the feeding section to the die The temperature of each zone is set to 140°C, 200°C, 220°C, 230°C, and 200°C; at the same time, 10 kg of Zhejiang Jushi chopped alkali-free glass fiber 508B, the chopped glass fiber is fed from the side feeding port by 10 kg through a weight-loss...

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Abstract

The invention discloses a special stress-whitening-resisting glass fiber reinforced polypropylene composite for automotive trims and a preparation method thereof. The special stress-whitening-resisting glass fiber reinforced polypropylene composite for automotive trims is characterized by comprising the following raw materials by weight percentage: 27-83 percent of polypropylene, 0-2 percent of heat stabilizer, 0-2 percent of processing agent, 0-2 percent of light stabilizer, 0-2 percent of special nucleating agent for polypropylene, 5-20 percent of flexibilizer, 2-10 percent of compatilizer, 5-20 percent of ultrafine talcum powder and 5-15 percent of chopped glass fiber. The preparation method comprises the following steps that after the raw materials are mixed, the mixture is added into a double-screw extruder with the length-diameter ratio of (30-60):1 to be molten and dispersed, meanwhile, the chopped glass fiber is fed into the double-screw extruder from a side feeding mouth to be extruded and pelletized, and the product is obtained. The composite has the characteristics of high stiffness, high heat resistance and stress whitening resistance and meets the requirement of the automotive trim material on stress whitening resistance.

Description

technical field [0001] The invention relates to a stress-whitening-resistant glass fiber-reinforced polypropylene compound for automotive interior decoration and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] At present, the matrix resin of automotive door panels, pillars and instrument panels and other interior materials is mainly made of polypropylene, the reinforcing filler is made of talcum powder, and the toughening rubber is made of ethylene octene copolymer (POE) thermoplastic elastomer, which is prepared by blending with a twin-screw extruder , this material has excellent toughness and processing performance, but it is easy to cause molecular chain breakage and slippage due to force during injection molding, ejection, demoulding and assembly, resulting in microscopic cracks, silver streaks and cavities in the stressed area of ​​the material , so that the refractive index of the stressed area changes,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/10C08K13/04C08K3/34C08K7/14C08J5/10
Inventor 孙刚周英辉李国明程文超李欣李志平陈延安丁超罗忠富
Owner SHANGHAI KINGFA SCI & TECH
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