阅读说明：本技术 一种夹层结构的碳纤维复合材料及其制备方法 (Sandwich-structured carbon fiber composite material and preparation method thereof ) 是由 严兵 郎鸣华 刘成 施刘生 张可可 王升 李秋秋 于 2019-11-04 设计创作，主要内容包括：本发明涉及一种夹层结构的碳纤维复合材料及其制备方法。所述的碳纤维复合材料具有多层结构,包括碳纤维层和改性聚芳醚酮层。采用该结构,使得碳纤维复合材料各个方向的机械强度均满足要求,并且一致性很高,并且具有质轻、热膨胀系数低、耐腐蚀等优点。(The invention relates to a carbon fiber composite material with a sandwich structure and a preparation method thereof. The carbon fiber composite material has a multilayer structure and comprises a carbon fiber layer and a modified polyaryletherketone layer. By adopting the structure, the mechanical strength of the carbon fiber composite material in all directions meets the requirements, the consistency is very high, and the carbon fiber composite material has the advantages of light weight, low thermal expansion coefficient, corrosion resistance and the like.)

1. The carbon fiber composite material with the sandwich structure is characterized by having a multilayer structure and comprising a carbon fiber layer and a modified polyaryletherketone layer.

2. The method for producing a carbon fiber composite material as defined in claim 1, comprising the steps of:

1) preparing a carbon fiber layer: weaving carbon fibers into a three-dimensional structure, heating for 20-30min under the conditions of 5-10MPa and 130-160 ℃, and then cooling to room temperature to obtain a carbon fiber layer;

2) preparation of modified polyaryletherketone layer

S1: resin modification: mixing polyaryletherketone resin and hollow glass beads according to the mass ratio of 100:10-20, and then granulating in an extruder to obtain granules with the particle size of less than 50 microns;

s2: modifying the three-dimensional fiber web: weaving carbon fibers into a three-dimensional structure, placing the three-dimensional carbon fibers in a mold, then paving the granules obtained in the step S1, oscillating for 30-60 minutes to enable the granules to be uniformly distributed in the three-dimensional carbon fibers, then pressing under the conditions of 10-20MPa and 150-170 ℃, and then cooling to room temperature to obtain a modified polyaryletherketone layer;

3) preparing a carbon fiber composite material: and (3) alternately superposing the obtained carbon fiber layers and the modified polyaryletherketone layers to form a composite multilayer structure, pressurizing, heating and curing the superposed material, pressing under the conditions of 20-30MPa and 150-170 ℃, preserving heat for 20-30min, cooling to room temperature, and recovering normal pressure to obtain the carbon fiber composite material with the sandwich structure.

3. The method for preparing a carbon fiber composite material as claimed in claim 2, wherein the weaving is performed by a cross weaving method or an electrospinning method.

4. The method of producing a carbon fiber composite material as defined in claim 2, wherein the density of the hollow glass microspheres is not more than 0.3 g/cc.

5. The method of claim 2, wherein the polyaryletherketone is selected from PEEK, PEK, PEKK, and PEEKK.

Technical Field

The invention belongs to the technical field of composite materials, and particularly relates to a carbon fiber composite material with a sandwich structure and a preparation method thereof.

Background

With the development of electronic lightweight, the traditional aluminum magnesium alloy material cannot meet the requirements, for example, notebook computers are reduced to below 1 kg from the traditional products, Ipad is developed to 700 g or even 500g from 900 g, and meanwhile, the function of Ipad is more and more powerful, so that a new material is urgently needed to solve the problem. The carbon fiber composite material has the advantages of light weight, high strength, low thermal expansion coefficient, corrosion resistance and the like, can solve the problems of light weight and miniaturization of equipment, and particularly has wide attention on the diversified development of carbon fiber products.

Chinese patent application publication No. CN101835596A discloses a composite molded article comprising a plate-like member and a resin member, the plate-like member having a concave-convex shaped joining surface where the plate-like member and the resin member are joined to each other in a concave-convex shape at mutually opposed side end surfaces, the plate-like member being obtained by integrating surface layer base materials positioned on the upper surface side and the lower surface side and a core layer base material positioned therebetween, wherein a straight line segment continuously connecting tops of adjacent convex portions in the concave-convex shape described by the surface layer base materials forms a convex portion passing line, and the length of an actual joining line formed along the concave-convex shape in the concave-convex shape is 1.05mm or more per 1mm length of the convex portion passing line. In the application, the prepared carbon fiber sheet is processed to a certain degree and then is subjected to injection molding and encapsulation, so that the carbon fiber sheet can be used for shells of electronic products such as notebook computers and the like.

Chinese patent application publication No. CN101231538A discloses a cover plate for a portable electronic device, which has an outer plate, an inner plate and a protective layer. The protective layer is arranged between the outer layer plate and the inner layer plate and is of a uniform net structure. The outer plate can also comprise a first plate, a second plate and a third plate, so that the outer plate can be designed in appearance, and the product value is improved.

Chinese utility model patent with publication number CN204414676U discloses a composite board and electronic equipment, this board includes: a first sheet layer, a second sheet layer, and a solid layer, the first sheet layer comprising at least one layer of a first reinforcing material; and comprising at least one layer of a second reinforcing material; the physical layer is located between the first and second sheet material layers, the physical layer protruding from the interlayer space between the first and second sheet material layers under a first predetermined condition. Because the solid layer is thermoplastic resin and has light weight, the whole weight of the composite board can be reduced, and when the secondary forming treatment is carried out, the solid layer can effectively prevent injection molding plastics from permeating into the composite board, so that the problem of deformation of the surface board layer of the composite board caused by permeation is prevented, the composite board can keep a good shape, and the product quality is improved.

Chinese patent application with publication number CN106183135A discloses a carbon fiber sheet, including the epoxy sheet stromatolite that is not more than six layers of carbon fiber prepreg and is not more than two-layer glass bead packing, the epoxy sheet stromatolite that the glass bead packed sets up the intermediate layer position at a plurality of carbon fiber prepreg, add one deck carbon fiber woven fabrics prepreg between carbon fiber prepreg and carbon fiber prepreg, carbon fiber prepreg and the epoxy sheet stromatolite that the glass bead packed. The carbon fiber sheet prepared by the method has the advantages of flame retardance, low deformation degree, light weight and easy mass production, and is particularly suitable for lightweight application of electronic products.

The carbon fiber reinforced material on both sides of the carbon fiber composite sheet is mostly thermosetting resin such as epoxy resin, etc., and the problem of adhesion occurs if the middle sandwich layer is thermoplastic resin. Foamed polypropylene sandwich layers and other thermoplastic materials are tried by various companies at home and abroad, but the obtained effect is not satisfactory, and the sheet material expands or contracts inconsistently when being heated or cooled, so that the sheet material is deformed. There is no prior art sheet material that is mechanically strong in all directions.

Disclosure of Invention

In order to solve the technical problems, the invention provides a carbon fiber composite material with a sandwich structure and a preparation method thereof. The carbon fiber composite material has a multilayer structure and comprises a carbon fiber layer and a modified polyaryletherketone layer. By adopting the structure, the mechanical strength of the carbon fiber composite material in all directions meets the requirements, the consistency is very high, and the carbon fiber composite material has the advantages of light weight, low thermal expansion coefficient, corrosion resistance and the like.

In order to realize the purpose of the invention, the invention adopts the following technical scheme: a carbon fiber composite material with a sandwich structure has a multilayer structure and comprises a carbon fiber layer and a modified polyaryletherketone layer.

The invention also provides a preparation method of the carbon fiber composite material with the sandwich structure, which comprises the following steps:

1) preparing a carbon fiber layer: weaving carbon fibers into a three-dimensional structure, heating for 20-30min under the conditions of 5-10MPa and 130-160 ℃, and then cooling to room temperature to obtain a carbon fiber layer;

2) preparation of modified polyaryletherketone layer

S1: resin modification: mixing polyaryletherketone resin and hollow glass beads according to the mass ratio of 100:10-20, and then granulating in an extruder to obtain granules with the particle size of less than 50 microns;

s2: modifying the three-dimensional fiber web: weaving carbon fibers into a three-dimensional structure, placing the three-dimensional carbon fibers in a mold, then paving the granules obtained in the step S1, oscillating for 30-60 minutes to enable the granules to be uniformly distributed in the three-dimensional carbon fibers, then pressing under the conditions of 10-20MPa and 150-170 ℃, and then cooling to room temperature to obtain a modified polyaryletherketone layer;

3) preparing a carbon fiber composite material: and (3) alternately superposing the obtained carbon fiber layers and the modified polyaryletherketone layers to form a composite multilayer structure, pressurizing, heating and curing the superposed material, pressing under the conditions of 20-30MPa and 150-170 ℃, preserving heat for 20-30min, cooling to room temperature, and recovering normal pressure to obtain the carbon fiber composite material with the sandwich structure.

In a preferred embodiment of the present invention, the knitting is performed by a cross knitting method or an electrospinning method.

In a preferred embodiment of the present invention, the hollow glass microspheres have a density of no greater than 0.3 g/cc.

In a preferred embodiment of the present invention, the polyaryletherketone is selected from one of PEEK, PEK, PEKK, and PEEKK.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, the hollow glass beads and the three-dimensional fiber net are adopted to modify the polyaryletherketone resin, so that the polyaryletherketone resin has the effect of synergistically improving the mechanical properties of the polyaryletherketone resin layer in all directions, the mechanical strength in all directions is good, and the consistency of the mechanical strength in all directions is very high.

2. The invention adopts the carbon fiber layer with a three-dimensional structure, so that the weight of the carbon fiber layer is further reduced.

3. The carbon fiber composite material with the sandwich structure formed by the carbon fiber layers and the modified polyaryletherketone layers alternately realizes the consistent mechanical strength, consistent expansion coefficient, high strength, low deformation degree and light weight of the material in all directions under the combined action of the carbon fiber layers and the modified polyaryletherketone resin layers, is easy for batch production, and is particularly suitable for light weight application of electronic products.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment and a second embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a third embodiment and a fourth embodiment of the present invention.

In the figure: 1-carbon fiber layer, 2-modified polyaryletherketone layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.

The present invention will be further described with reference to the following examples.