Polypropylene compound with low linear expansion coefficient for automobile fender and preparation method thereof

A technology for automobile fenders and low linear expansion, which is applied in the field of polypropylene composites for automobile fenders with low linear expansion coefficient and its preparation, and can solve the problems of affecting the appearance of automobiles, large dimensional changes, and large linear expansion coefficients, etc.

Pending Publication Date: 2020-04-28
JIANGSU KINGFA SCI & TECH ADVANCED MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional automotive polypropylene composite materials are generally filled with talcum powder to increase rigidity. At the same time, to ensure its toughness, a large amount of thermoplastic elastomer is added. The linear expansion coefficient of this modified polypropylene material is extremely large. Among them, the size changes greatly in different seasons, which affects the assembly of the car fender, and also causes "surface difference" between the fender and the body, which affects the appearance of the car

Method used

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  • Polypropylene compound with low linear expansion coefficient for automobile fender and preparation method thereof
  • Polypropylene compound with low linear expansion coefficient for automobile fender and preparation method thereof

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[0024] A method for preparing a polypropylene compound for a car fender with a low coefficient of linear expansion, the steps are as follows:

[0025] Step 1: Weigh the polypropylene, heat stabilizer, processing aid, ethylene / octene copolymer, hydrogenated styrene / butadiene / styrene copolymer and ethylene / acrylate copolymer in the aspect ratio of Melt mixing and dispersion in a 40:1 twin-screw extruder;

[0026] Step 2: Feed the superfine talc powder in the formulated amount into the twin-screw extruder from the side through the weight loss weighing scale, set the temperature of each section of the extruder at 190-240°C, extrude and granulate, and finally obtain the product.

[0027] One, the preparation of embodiment and comparative example

[0028] Polypropylene, manufacturer: SK Korea;

[0029] Phenolic heat stabilizer 1010, manufacturer: BASF;

[0030] Phosphite heat stabilizer, manufacturer: BASF;

[0031] Processing aid, manufacturer: Japan Kao;

[0032] Ethylene / oct...

Embodiment 1

[0037] 54 kg of polypropylene PP BX3900, 0.2 kg Phenols Thermal stability agent 1010, 0.3 kg of phosphite heat stabilizer 168, 0.5 kg of processing aid EBS (ethylene bis stearic acid amide), 5 kg of ethylene / octene copolymer POE 7447, 5 kg of hydrogenated styrene / butadiene / Styrene copolymer SEBS 6154, 5 kg of ethylene / acrylate copolymer EA101 are added to the extruder for melt mixing and dispersion; 30 kg of ultra-fine talc powder (5000 mesh) is accurately added from the side feeding through a weight-loss weighing scale, 200 ° C Extrude and granulate to finally get the product.

Embodiment 2

[0039] 51.5 kg of polypropylene PP BX3800, 0.5 kg Phenols Thermal stability agent1010, 0.5 kg of phosphite heat stabilizer 168, 0.5 kg of processing aid EB-FF, 6 kg of ethylene / octene copolymer POE 8137, 3 kg of hydrogenated styrene / butadiene / styrene copolymer SEBS G1657, 3 kg of ethylene / acrylate copolymer EMA 1125C is melt-mixed and dispersed in a twin-screw extruder with an aspect ratio of 1:40; 35 kg of superfine talc powder (8000 mesh) is accurately fed from the side through a loss-in-weight weighing scale Add, extrude and granulate at 220°C, and finally get the product.

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Abstract

The invention relates to a polypropylene compound with a low linear expansion coefficient for an automobile fender. The polypropylene compound comprises the following components in parts by weight: 29-65 parts of polypropylene, 0.1-2 parts of a heat stabilizer, 0.1-1 part of a processing aid, 5-20 parts of an ethylene / octene copolymer, 1-7 parts of a hydrogenated styrene / butadiene / styrene copolymer, 1-7 parts of an ethylene / acrylate copolymer and 25-35 parts of ultrafine talcum powder. According to the polypropylene compound, three elastomers including the ethylene / octene copolymer, the hydrogenated styrene / butadiene / styrene elastomer and the ethylene / acrylate elastomer are adopted for synergistic toughening, and the polypropylene compound with the low linear expansion coefficient within the temperature interval of -30 DEG C to 85 DEG C is obtained.

Description

technical field [0001] The invention relates to a polypropylene compound, in particular to a polypropylene compound for an automobile fender with a low linear expansion coefficient and a preparation method thereof. Background technique [0002] The function of the car fender is to prevent the sand, gravel and mud rolled up by the wheels from splashing to the bottom of the car when the car is running. At present, most of the car fenders are made of metal materials, and the density of metal materials is high, which does not meet the development trend of lightweight cars. Therefore, the replacement of steel with plastic for automobile fenders has become the development trend of the automobile industry. Polypropylene material has become the preferred material for automobile lightweight due to its advantages of non-toxicity, environmental protection, low density and recyclability, and is widely used in automobile interior and exterior decoration and engine parts. [0003] Tradi...

Claims

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Application Information

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IPC IPC(8): C08L23/10C08L23/08C08L53/02C08K13/02C08K3/34
CPCC08L23/10C08L2205/035C08L23/0815C08L23/0869C08L53/025C08K13/02C08K3/34
Inventor 孙刚左立增谢正瑞陈延安李志平杨波罗忠富夏建盟黄河生
Owner JIANGSU KINGFA SCI & TECH ADVANCED MATERIALS CO LTD
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