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A preparation method and product of a carbon fiber-reinforced multilayer structure injection molding product

A multi-layer structure, injection molding product technology, applied in the direction of coating, can solve the problems of affecting the mechanical properties of products, easy to meet the requirements, and high processing costs, to reduce the appearance defect rate, enhance appearance protection, and simplify the production process. Effect

Active Publication Date: 2019-08-13
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the processing cost of polymer composite materials is relatively high, and the combination of different polymers during in-mold injection molding is likely to fail to meet the requirements, etc., which all affect the mechanical properties of the product

Method used

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  • A preparation method and product of a carbon fiber-reinforced multilayer structure injection molding product
  • A preparation method and product of a carbon fiber-reinforced multilayer structure injection molding product
  • A preparation method and product of a carbon fiber-reinforced multilayer structure injection molding product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of prepreg: Coat a layer of polycarbonate powder on the surface of carbon fiber cloth by electrostatic powder spraying method, bake in an oven at 230°C for 10 minutes, and prepare a carbon fiber reinforced layer sheet with a plastic content of 35%; polycarbonate and Polypropylene was mixed at a ratio of 3:2, 5% (wt) PP-g-MAH was added, powder was coated on carbon fiber cloth by powder spraying, and the middle layer sheet was obtained by baking in an oven at 200°C for 10mim.

[0043] Hot press forming: the mold temperature is increased to 180°C, ten layers of prepreg are put into the hot press mold in sequence, the top layer is the connecting layer, the inside of the hot press is vacuumed to below 1KPa, and the mold temperature is raised to 240°C, Clamp the mold with a hot press, apply a pressure of 5 tons and keep warm for 30 minutes to obtain a composite material product.

[0044]Cooling and cleaning: Stop heating and vacuuming, cool to 100°C at a cooling r...

Embodiment 2

[0047] Preparation of prepreg: Coat a layer of polycarbonate powder on the surface of carbon fiber cloth by electrostatic powder spraying, bake in an oven at 260°C for 5 minutes, and prepare a carbon fiber reinforced layer sheet with a plastic content of 70%; polycarbonate and Polypropylene was mixed at a ratio of 4:1, 20% (wt) of PP-g-MAH was added, powder was coated on carbon fiber cloth by powder spraying, and the middle layer sheet was obtained by baking in an oven at 250°C for 5mim.

[0048] Hot press forming: the mold temperature is increased to 180°C, ten layers of prepreg are put into the hot press mold in sequence, the top layer is the connection layer, the inside of the hot press is vacuumed to below 1KPa, and the mold temperature is raised to 260°C, Clamp the mold with a hot press, apply a pressure of 10 tons and keep warm for 15 minutes to obtain a composite material product.

[0049] Cooling and cleaning: Stop heating and vacuuming, cool to 100°C at a cooling rate...

Embodiment 3

[0052] Preparation of prepreg: Coat a layer of polycarbonate powder on the surface of carbon fiber cloth by electrostatic powder spraying method, bake in an oven at 240°C for 8 minutes, and prepare a carbon fiber reinforced layer sheet with a plastic content of 45%; polycarbonate and Polypropylene is mixed in a ratio of 7:3, 10% (wt) PP-g-MAH is added, powder is coated on carbon fiber cloth by powder spraying, and the middle layer sheet is obtained by baking in an oven at 220°C for 6mim.

[0053] Hot press forming: the mold temperature is increased to 180°C, ten layers of prepreg are put into the hot press mold in sequence, the top layer is the connection layer, the inside of the hot press is vacuumed to below 1KPa, and the mold temperature is raised to 250°C, Clamp the mold with a hot press, apply a pressure of 8 tons and keep warm for 20 minutes to obtain a composite material product.

[0054] Cooling and cleaning: Stop heating and vacuuming, cool to 100°C at a cooling rate ...

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Abstract

The invention belongs to the field of injection molding product forming and discloses a preparation method of a carbon fiber enhanced multilayered structure injection molding product and a product ofthe preparation method. The preparation method comprises the following steps: a, preparing a carbon fiber enhancement layer and a connection layer through the electrostatic powder spraying technology;b, stacking the carbon fiber enhancement layer and the connection layer and then carrying out hot-press forming to form carbon fiber enhanced composite material, wherein the connection layer is stacked on the uppermost layer; and c, putting the carbon fiber enhanced composite material in a die and carrying out injection molding to obtain the required product. The invention further discloses the product prepared through the preparation method. Compared with the preparation method, a high-viscosity material composite material plate is obtained through the hot-pressing technology with low cost and high efficiency; in addition, the multilayered composite material structure is obtained by combining with the intramode injection molding technology, so that the high material cost is reduced and the surface decoration function is also played; and compared with the electronic engineering plastic with the same thickness, the product is high in mechanical strength.

Description

technical field [0001] The invention belongs to the field of injection molding products, and more specifically relates to a method for preparing a carbon fiber-reinforced multi-layer structure injection molding product and its products. Background technique [0002] Carbon fiber is a new material with excellent mechanical properties. Its specific gravity is less than 1 / 4 of that of steel. The tensile strength of carbon fiber resin composite (CFRP) is generally above 3500Mpa, which is 7 to 9 times that of steel. Tensile elastic modulus The amount of 230 ~ 430Gpa is also higher than that of steel. Now it has been widely used in aerospace, aviation, automobile, electronics, machinery, chemical industry, light textile and other civilian industries to sports equipment and leisure products industry. [0003] Compared with engineering plastics, composite materials have the characteristics of high mechanical strength and good wear resistance. There are many molding processes for co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/14B29B11/16
CPCB29B11/16B29C45/14
Inventor 黄志高张安男周华民张云王云明郑兵
Owner HUAZHONG UNIV OF SCI & TECH
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