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Composite material, preparation method and application thereof

A composite material and sheet technology, applied in the field of composite materials, can solve the problems of high mold temperature, poor surface quality, high energy consumption, etc., and achieve the effects of high interlayer bonding strength, good surface quality, and simple preparation method.

Inactive Publication Date: 2018-07-06
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the prepreg compression molding usually requires carbon fiber epoxy resin prepreg or thermoplastic resin prepreg compression molding. The surface quality of the finished product formed by the solidification of the material is poor, and subsequent grinding and spraying are required many times to obtain a product with a better appearance
The prepreg compression molding can often only form products with relatively simple structures
In addition, liquid resin transfer molding, which is widely used in the automotive and aerospace industries, generally requires complex pre-molding steps, and usually the fiber cloth is placed directly in the mold and injected with liquid resin for resin transfer molding, which will The fiber cloth is easily washed away by the fast-injected resin, which seriously affects the product quality; and because the liquid resin used is mostly epoxy resin, in order to speed up the molding speed, it often requires a higher mold temperature, greater energy consumption, and poorer surface quality. and poor scratch resistance
In addition, none of the above methods can guarantee the bonding force between the subsequent in-mold injection molding of carbon fiber composite materials and plastics.

Method used

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  • Composite material, preparation method and application thereof
  • Composite material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0013] The preparation method of the composite material provided by the present invention comprises attaching a fiber layer on at least one side surface of a thermoplastic sheet or a metal sheet through an adhesive to form a preform, and then forming a preform on the surface of the fiber layer of the preform A two-component polyurethane resin is used for resin transfer molding to form a polyurethane-fiber layer together with the fiber layer; the two-component polyurethane resin contains a polyol component and a polyisocyanate component. In the present invention, the polyurethane-fiber layer refers to a coating comprising a fiber layer formed after the two-component polyurethane resin permeates into the fiber layer and is solidified, that is, the coating on the surface of the thermoplastic sheet is composed of a fiber layer and a two-component polyurethane resin. The overall structure formed by curing.

[0014] The material of the thermoplastic sheet is not particularly limited...

Embodiment approach

[0021] According to a preferred embodiment of the present invention, the viscosity of the polyol component at 25°C is less than 2500mPa·s, more preferably less than 2000mPa·s, most preferably less than 1500mPa·s; the viscosity of the polyisocyanate component at 25°C The viscosity at lower temperature is less than 2000mPa·s, more preferably less than 1500mPa·s, most preferably less than 1000mPa·s. The inventors of the present invention have found that when the viscosity of the polyol component and the polyisocyanate component is controlled within the above-mentioned preferred range, the mixing efficiency of the polyol component and the polyisocyanate component and the effect on the fiber layer can be improved. infiltration.

[0022] According to the present invention, the two-component polyurethane resin further contains a catalyst for catalyzing the reaction between the polyol component and the polyisocyanate component. The catalyst may be selected from at least one of organi...

Embodiment 1-5

[0046] A polyurethane hot-melt adhesive film (purchased from Shanghai Hehe Hot-melt Adhesive Co., Ltd., brand LN376) is thermally pasted on one side of the fiber layer, and then the thermoplastic sheet is put into a pre-forming mold, and then put into A fiber layer with a polyurethane-type hot-melt adhesive film attached (placed in such a way that the polyurethane-type hot-melt adhesive film is placed between the thermoplastic sheet and the fiber layer), followed by molding so that the fiber layer is attached to one side of the thermoplastic sheet On the surface, a preform is formed. Among them, the specific types and thicknesses of the fiber layer and the thermoplastic sheet and the conditions for molding and bonding are shown in Table 1.

[0047] The preform is placed in the mold with the fiber layer of the preform facing up, and then a two-component polyurethane resin is injected into the mold with a high-pressure injection machine for resin transfer molding, so as to be co...

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Abstract

Relating to the field of composite materials, the invention discloses a composite material, a preparation method and application thereof. The preparation method of the composite material includes: gluing a fiber layer to at least one side surface of a thermoplastic sheet or metal sheet through an adhesive to form a preform, then employing two-component polyurethane resin for resin transfer moldingon the fiber layer surface of the perform so as to form a polyurethane-fiber layer together with the fiber layer. Specifically, the two-component polyurethane resin contains a polyol component and apolyisocyanate component. The preparation method for the composite material provided by the invention not only can ensure no springback of fiber cloth, but also can acquire good surface quality, and the obtained product has very high transparency, scratch resistance and interlayer bonding strength.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a preparation method of a composite material, a composite material prepared by the method and an application of the composite material as a decorative part. Background technique [0002] Fiber composite molding methods mainly include prepreg compression molding and resin transfer molding (RTM). Wherein, the prepreg compression molding refers to putting the fiber material pre-impregnated with the resin matrix into a mold, and then performing molding to make the molding material gradually solidify, and then taking the product out of the mold. The resin transfer molding refers to laying the fiber material in the mold, then injecting the resin matrix into the mold with pressure, the resin matrix is ​​soaked into the fiber material, and then curing and demolding. [0003] For example, CN102785627A discloses a method similar to prepreg compression molding to prepare fiber composite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/12B32B15/14B32B7/12B32B27/04B32B27/40B32B37/12B32B37/06B32B37/10B44C5/00
CPCB32B7/12B32B15/14B32B27/12B32B27/40B32B37/06B32B37/10B32B37/12B32B2255/02B32B2255/26B32B2260/021B32B2260/046B32B2307/412B32B2307/584B32B2451/00B44C5/00
Inventor 黄少华张秀峰徐学峰林宏业
Owner BYD CO LTD
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