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Low-density automobile back door plate module and preparation method thereof

A rear door panel, low-density technology, applied in the field of auto parts, can solve the problems of increasing product manufacturing costs, long molding cycle, and unfavorable design concepts for lightweight automobiles.

Inactive Publication Date: 2013-01-02
GREAT WALL MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw materials of this ordinary automobile door panel module are mainly polypropylene and talcum powder. After injection molding, the rear door panel module has a compact texture, high density and heavy weight, which increases the material consumption and production cost of the product, which is not conducive to the light weight of today's automobiles. Quantitative design concept, and the surface of the product is prone to defects such as sink marks, which seriously affects the appearance quality of the product and increases the failure rate of the product
At the same time, the conventional injection molding process has defects such as high energy consumption of molding equipment and long molding cycle, which increases the manufacturing cost of the product

Method used

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  • Low-density automobile back door plate module and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: Modified polypropylene particles weigh raw materials according to the following proportions: 60 KG of polypropylene base material, 20 KG of talcum powder, 1 KG of impact modifier, 2 KG of slip agent, 0.4 KG of antioxidant, and Stabilizer 0.4 KG, UV absorber 0.2 KG, inorganic toner 2 KG. The foaming masterbatch weighs the raw materials according to the following proportions: 60 KG of high-pressure polyethylene, 4 KG of ethylene-vinyl acetate copolymer, 10 KG of talcum powder, 6 KG of foaming agent, 0.6 KG of silane coupling agent, and 0.4 KG of antioxidant KG. Prepare 3mm×5mm columnar modified polypropylene granules and 3mm×3mm foam masterbatch granules by twin-screw blending extrusion granulation respectively, and weigh them according to the ratio of modified polypropylene granules: foam masterbatch granules 100:1 Take the above two granules.

Embodiment 2

[0018] Embodiment 2: Modified polypropylene particles weigh raw materials according to the following proportions: 65 KG of polypropylene substrate, 20 KG of talcum powder, 5 KG of impact modifier, 2 KG of slip agent, 0.4 KG of antioxidant, and Stabilizer 0.4 KG, UV absorber 0.2 KG, inorganic toner 2 KG. The foaming masterbatch is weighed according to the following ratio of raw materials: high-pressure polyethylene 65 KG, ethylene-vinyl acetate copolymer 10 KG, talcum powder 10 KG, foaming agent 7 KG, silane coupling agent 0.6 KG, antioxidant 0.4 KG. Prepare 3mm×5mm columnar modified polypropylene granules and 3mm×3mm foam masterbatch granules by twin-screw blending extrusion granulation respectively, and weigh them according to the ratio of modified polypropylene granules: foam masterbatch granules 100:2 Take the above two granules.

Embodiment 3

[0019]Embodiment 3: Modified polypropylene particles weigh raw materials according to the following ratio: 74 KG of polypropylene substrate, 20 KG of talcum powder, 15 KG of impact modifier, 2 KG of slip agent, 0.4 KG of antioxidant, and Stabilizer 0.4 KG, UV absorber 0.2 KG, inorganic toner 2 KG. The foaming masterbatch weighs raw materials according to the following ratio: high-pressure polyethylene 70 KG, ethylene-vinyl acetate copolymer 19 KG, talc powder 10 KG, foaming agent 9 KG, silane coupling agent 0.6 KG, antioxidant 0.4 KG . Prepare 3mm×5mm columnar modified polypropylene granules and 3mm×3mm foam masterbatch granules by twin-screw blending extrusion granulation respectively, and weigh them according to the ratio of modified polypropylene granules: foam masterbatch granules 100:4 Take the above two granules.

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Abstract

The invention relates to a low-density automobile back door plate module and a preparation method thereof. The preparation method is used for reducing self weight of automobile back door plate modules and overcoming appearance defects of sink marks, warping deformation and the like. The low-density automobile back door plate module uses modified polypropylene particles and foaming masterbatches as raw materials and is produced through mixing injection molding, and the mass ratio of the modified polypropylene particles and the foaming masterbatches is 100: (1-4). According to the low-density automobile back door plate module and the preparation method thereof, the modified polypropylene particles and the foaming masterbatches are used as the raw materials, conventional injection processes are improved according to raw material characteristics and molding requirements, and a high-pressure high-speed injection process is used, so that the intensity of produced injection products is lower than that of ordinary polypropylene modules by 10%-15%, 10%-15% of a molding period can be shortened, the usage quantity of the raw materials is saved, and the molding period can be substantially shortened.

Description

technical field [0001] The invention relates to an automobile part, in particular to a low-density automobile rear door panel module formed by injection molding of polypropylene closed-cell foaming and a preparation method thereof. Background technique [0002] At present, the rear door panel modules of automobiles are mostly made of polypropylene modified plastics, and are made by general injection molding process. The raw materials of this ordinary automobile door panel module are mainly polypropylene and talcum powder. After injection molding, the rear door panel module has a compact texture, high density and heavy weight, which increases the material consumption and production cost of the product, which is not conducive to the light weight of today's automobiles. Quantitative design concept, and the surface of the product is prone to defects such as sink marks, which seriously affects the appearance quality of the product and increases the failure rate of the product. A...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/06C08L23/08C08K13/02C08K3/34C08K5/20C08K5/134C08K5/3435C08K5/3475C08J3/22C08J9/10B29C45/77B29C45/78
Inventor 李文博
Owner GREAT WALL MOTOR CO LTD
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