Graphene reinforced glass fiber resin prepreg as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of heat conduction materials, and discloses a graphene reinforced glass fiber resin prepreg as well as a preparation method and application thereof. The preparation method comprises the following steps: taking glass fiber cloth as a reinforcing layer, coating the upper and lower surfaces of the glass fiber cloth with a compound of graphene and resin to form a prepreg, then cutting the prepreg according to the shape of the mobile phone rear cover, repeating multiple layers to a preset thickness, and curing and forming to obtain the mobile phone rear cover. The glass fiber cloth is used as a reinforcing material, the mechanical property of the prepreg is improved, and the graphene powder is added into the resin, so that the heat-conducting property of the prepreg is improved. Compared with a metal material, the graphene reinforced glass fiber resin prepreg has lower density and is beneficial to reducing the weight of a mobile phone. The mobile phone rear cover prepared by the invention has the characteristics of high strength, good heat-conducting property and light weight.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal conductive materials, and in particular to a graphene-reinforced glass fiber resin prepreg and a preparation method and application thereof. Background Art

[0002] With the development of science and technology, the performance requirements of mobile phones and other electronic products are getting higher and higher, and the requirements for their back cover materials are becoming more and more stringent. The back cover materials of mobile phones in the existing technology are mostly made of plastic, metal and other materials. Although they have certain strength and thermal conductivity, they have the following shortcomings:

[0003] Plastic materials have low strength and are easily damaged; metal materials have good thermal conductivity, but are heavy and not portable; although existing composite materials have high strength, their thermal conductivity is poor.

[0004] Therefore, it is necessary to study a mobile phone back cover material with high strength and good thermal conductivity. Summary of the invention

[0005] The purpose of the present invention is to provide a graphene-reinforced glass fiber resin prepreg and a preparation method and application thereof, so as to solve the problem that the existing mobile phone back cover materials cannot take into account both mechanical properties and thermal conductivity.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a graphene-reinforced glass fiber resin prepreg, comprising the following structure:

[0008] Graphene-resin layer, glass fiber cloth reinforcement layer;

[0009] Graphene-resin layers are provided on the upper and lower surfaces of the glass fiber cloth reinforcement layer;

[0010] The mass of graphene in the graphene-resin layer is 5-15% of the mass of the resin.

[0011] Preferably, in the above-mentioned graphene-reinforced glass fiber resin prepreg, the thickness of the graphene-resin layer is 0.1 to 0.15 mm.

[0012] Preferably, in the above-mentioned graphene reinforced glass fiber resin prepreg, the thickness of the glass fiber cloth reinforcement layer is 0.1 to 0.15 mm.

[0013] Preferably, in the above-mentioned graphene-reinforced glass fiber resin prepreg, the material of the glass fiber cloth reinforcement layer is glass fiber cloth; the mass specification of the glass fiber cloth is one of 50g, 100g, and 200g.

[0014] Preferably, in the above-mentioned graphene-reinforced glass fiber resin prepreg, the resin in the graphene-resin layer is one or more of epoxy resin, phenolic resin, polyester resin and amino resin.

[0015] The present invention also provides a method for preparing a graphene-reinforced glass fiber resin prepreg, comprising the following steps:

[0016] mixing graphene and resin to obtain a graphene-resin composite;

[0017] The graphene-resin composite is coated on the upper and lower surfaces of the glass fiber cloth reinforcement layer to obtain a graphene-reinforced glass fiber resin prepreg.

[0018] Preferably, in the above-mentioned method for preparing a graphene-reinforced glass fiber resin prepreg, the time for mixing the graphene and the resin is 30 to 60 minutes.

[0019] Preferably, in the above-mentioned method for preparing graphene-reinforced glass fiber resin prepreg, the coating amount is 30-45% of the resin mass content per square meter of the glass fiber cloth reinforcement layer.

[0020] The present invention also provides an application of graphene reinforced glass fiber resin prepreg in a mobile phone back cover.

[0021] Preferably, in the above application, the method for preparing the mobile phone back cover comprises the following steps:

[0022] The graphene reinforced glass fiber resin prepreg is cut according to the shape of the mobile phone back cover, and then multiple layers of graphene reinforced glass fiber resin prepreg are repeatedly arranged, and then cured and formed to obtain the mobile phone back cover.

[0023] It can be seen from the above technical solution that compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention uses glass fiber cloth as a reinforcing layer, and a composite of graphene and resin is coated on its upper and lower surfaces to form a prepreg, and then the prepreg is cut according to the shape of the mobile phone back cover, and then multiple layers are repeated to a preset thickness, and the mobile phone back cover is obtained after curing and molding. The present invention uses glass fiber cloth as a reinforcing material to improve the mechanical properties of the prepreg, and graphene powder is added to the resin to improve the thermal conductivity of the prepreg. Compared with metal materials, graphene reinforced glass fiber resin prepreg has a lower density, which is conducive to reducing the weight of the mobile phone. The mobile phone back cover prepared by the present invention has the characteristics of high strength, good thermal conductivity and lightweight. DETAILED DESCRIPTION

[0025] The present invention provides a graphene-reinforced glass fiber resin prepreg, comprising the following structure:

[0026] Graphene-resin layer, glass fiber cloth reinforcement layer;

[0027] Graphene-resin layers are provided on the upper and lower surfaces of the glass fiber cloth reinforcement layer.

[0028] In the present invention, the mass of the graphene in the graphene-resin layer is preferably 5 to 15% of the mass of the resin, more preferably 8 to 15%, and even more preferably 15%.

[0029] In the present invention, the thickness of the graphene-resin layer is preferably 0.1 to 0.15 mm, more preferably 0.1 to 0.12 mm, and more preferably 0.1 mm.

[0030] In the present invention, the resin in the graphene-resin layer is preferably one or more of epoxy resin, phenolic resin, polyester resin, and amino resin, more preferably epoxy resin or phenolic resin, and more preferably epoxy resin.

[0031] In the present invention, the thickness of the glass fiber cloth reinforcement layer is preferably 0.1 to 0.15 mm, more preferably 0.1 to 0.13 mm, and even more preferably 0.11 mm.

[0032] In the present invention, the material of the glass fiber cloth reinforcement layer is preferably glass fiber cloth; the mass specification of the glass fiber cloth is preferably one of 50g, 100g, and 200g, more preferably 50g or 100g, and more preferably 100g.

[0033] The present invention does not limit the sources of the resin, graphene, and glass fiber cloth, and conventional selections in the art may be used.

[0034] The present invention also provides a method for preparing a graphene-reinforced glass fiber resin prepreg, comprising the following steps:

[0035] mixing graphene and resin to obtain a graphene-resin composite;

[0036] The graphene-resin composite is coated on the upper and lower surfaces of the glass fiber cloth reinforcement layer to obtain a graphene-reinforced glass fiber resin prepreg.

[0037] In the present invention, the mixing time of the graphene and the resin is preferably 30 to 60 minutes, more preferably 30 to 50 minutes, and more preferably 30 minutes.

[0038] In the present invention, the method of mixing the graphene and the resin is preferably stirring or ultrasound, and more preferably ultrasound.

[0039] In the present invention, the coating amount is preferably 30-45% by mass, more preferably 35-42% by mass, and even more preferably 40% by mass of the resin per square meter of the glass fiber cloth reinforcement layer.

[0040] In the present invention, the resin mass content per square meter of the glass fiber cloth reinforcement layer represents the percentage of the mass of the resin per square meter of the glass fiber cloth reinforcement layer to the total mass of the glass fiber cloth reinforcement layer and the graphene-resin composite per square meter.

[0041] The present invention also provides an application of graphene reinforced glass fiber resin prepreg in a mobile phone back cover.

[0042] In the present invention, the method for preparing the mobile phone back cover comprises the following steps:

[0043] The graphene reinforced glass fiber resin prepreg is cut according to the shape of the mobile phone back cover, and then multiple layers of graphene reinforced glass fiber resin prepreg are repeatedly arranged, and then cured and formed to obtain the mobile phone back cover.

[0044] In the present invention, the number of layers of the repeatedly arranged multi-layer graphene reinforced glass fiber resin prepreg is determined according to the target thickness of the back cover of the mobile phone; the target thickness is preferably ≥0.2mm, more preferably ≥0.3mm, and more preferably 0.62mm.

[0045] In the present invention, the curing temperature is preferably 120-140°C, more preferably 125-135°C, and more preferably 130°C; the curing time is preferably 6-10 min, more preferably 7-9 min, and more preferably 8 min.

[0046] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Example 1

[0048] This embodiment provides a mobile phone back cover material, and the preparation method thereof comprises the following steps:

[0049] (1) ultrasonically mixing graphene and epoxy resin for 30 minutes to obtain a graphene-resin composite; wherein the mass of the graphene is 15% of the mass of the epoxy resin;

[0050] (2) coating the graphene-resin composite on the upper and lower surfaces of the glass fiber cloth, the mass specification of the glass fiber cloth is 100 g, and the coating amount is 40% by mass content of resin per square meter, to obtain a graphene-reinforced glass fiber resin prepreg; wherein the thickness of the graphene-resin layer on the upper and lower surfaces is 0.1 mm, and the thickness of the glass fiber cloth reinforcement layer is 0.11 mm;

[0051] (3) The graphene-reinforced glass fiber resin prepreg is cut into the shape of a mobile phone back cover, and then multiple layers of graphene-reinforced glass fiber resin prepreg are repeatedly arranged until the target thickness is 0.62 mm, and then cured at 130° C. for 8 min to obtain the mobile phone back cover.

[0052] The bending strength of the mobile phone back cover prepared in this embodiment is 25 Gpa.

[0053] The mobile phone back cover made in this embodiment is tested for thermal conductivity by laser flash method, and pure glass fiber cloth is used as a comparison. After testing, the mobile phone back cover made in this embodiment can reduce the temperature by 3°C compared with pure glass fiber cloth.

[0054] Example 2

[0055] This embodiment provides a mobile phone back cover material, and the preparation method thereof comprises the following steps:

[0056] (1) ultrasonically mixing graphene and epoxy resin for 50 minutes to obtain a graphene-resin composite; wherein the mass of graphene is 8% of the mass of epoxy resin;

[0057] (2) coating the graphene-resin composite on the upper and lower surfaces of the glass fiber cloth, the mass specification of the glass fiber cloth is 50 g, and the coating amount is 32% of the resin mass content per square meter, to obtain a graphene-reinforced glass fiber resin prepreg; wherein the thickness of the graphene-resin layer on the upper and lower surfaces is 0.1 mm, and the thickness of the glass fiber cloth reinforcement layer is 0.11 mm;

[0058] (3) The graphene-reinforced glass fiber resin prepreg is cut into the shape of a mobile phone back cover, and then multiple layers of graphene-reinforced glass fiber resin prepreg are repeatedly arranged until the target thickness is 0.62 mm, and then cured at 120° C. for 6 min to obtain the mobile phone back cover.

[0059] The bending strength of the mobile phone back cover prepared in this embodiment is 22 Gpa.

[0060] The thermal conductivity test was performed according to the method of Example 1. After the test, the mobile phone back cover using this embodiment can reduce the temperature by 2.2° C. compared with pure glass fiber cloth.

[0061] Example 3

[0062] This embodiment provides a mobile phone back cover material, and the preparation method thereof comprises the following steps:

[0063] (1) ultrasonically mixing graphene and epoxy resin for 40 minutes to obtain a graphene-resin composite; wherein the mass of the graphene is 10% of the mass of the epoxy resin;

[0064] (2) coating the graphene-resin composite on the upper and lower surfaces of the glass fiber cloth, the mass specification of the glass fiber cloth is 200 g, and the coating amount is 32% of the resin mass content per square meter, to obtain a graphene-reinforced glass fiber resin prepreg; wherein the thickness of the graphene-resin layer on the upper and lower surfaces is 0.11 mm, and the thickness of the glass fiber cloth reinforcement layer is 0.11 mm;

[0065] (3) The graphene-reinforced glass fiber resin prepreg is cut into the shape of a mobile phone back cover, and then multiple layers of graphene-reinforced glass fiber resin prepreg are repeatedly arranged until the target thickness is 0.66 mm, and then cured at 125° C. for 7 minutes to obtain the mobile phone back cover.

[0066] The bending strength of the mobile phone back cover prepared in this embodiment is 23 Gpa.

[0067] The thermal conductivity test was performed according to the method of Example 1. After the test, the mobile phone back cover using this embodiment can reduce the temperature by 2.3°C compared with pure glass fiber cloth.

[0068] Example 4

[0069] This embodiment provides a mobile phone back cover material, and the preparation method thereof comprises the following steps:

[0070] (1) ultrasonically mixing graphene and epoxy resin for 60 minutes to obtain a graphene-resin composite, wherein the mass of the graphene is 12% of the mass of the epoxy resin;

[0071] (2) coating the graphene-resin composite on the upper and lower surfaces of the glass fiber cloth, the mass specification of the glass fiber cloth is 50 g, and the coating amount is 45% of the resin mass content per square meter, to obtain a graphene-reinforced glass fiber resin prepreg; wherein the thickness of the graphene-resin layer on the upper and lower surfaces is 0.12 mm, and the thickness of the glass fiber cloth reinforcement layer is 0.11 mm;

[0072] (3) The graphene-reinforced glass fiber resin prepreg is cut into the shape of a mobile phone back cover, and then multiple layers of graphene-reinforced glass fiber resin prepreg are repeatedly arranged until the target thickness is 0.7 mm, and then cured at 140° C. for 10 min to obtain the mobile phone back cover.

[0073] The bending strength of the mobile phone back cover prepared in this embodiment is 25 Gpa.

[0074] The thermal conductivity test was performed according to the method of Example 1. After the test, the mobile phone back cover using this embodiment can reduce the temperature by 2.6° C. compared with pure glass fiber cloth.

[0075] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A graphene-reinforced glass fiber resin prepreg, characterized in that: Includes the following structure: Graphene-resin layer, glass fiber cloth reinforcement layer; Graphene-resin layers are provided on the upper and lower surfaces of the glass fiber cloth reinforcement layer; The mass of graphene in the graphene-resin layer is 5-15% of the mass of the resin.

2. The graphene-reinforced glass fiber resin prepreg according to claim 1, characterized in that: The thickness of the graphene-resin layer is 0.1-0.15 mm.

3. The graphene-reinforced glass fiber resin prepreg according to claim 2, characterized in that: The thickness of the glass fiber cloth reinforcement layer is 0.1-0.15 mm.

4. A graphene-reinforced glass fiber resin prepreg according to claim 1 or 2, characterized in that: The material of the glass fiber cloth reinforcement layer is glass fiber cloth; the quality specification of the glass fiber cloth is one of 50g, 100g and 200g.

5. The graphene-reinforced glass fiber resin prepreg according to claim 4, characterized in that: The resin in the graphene-resin layer is one or more of epoxy resin, phenolic resin, polyester resin and amino resin.

6. A method for preparing a graphene-reinforced glass fiber resin prepreg according to any one of claims 1 to 5, characterized in that: The following steps are involved: mixing graphene and resin to obtain a graphene-resin composite; The graphene-resin composite is coated on the upper and lower surfaces of the glass fiber cloth reinforcement layer to obtain a graphene-reinforced glass fiber resin prepreg.

7. The method for preparing a graphene-reinforced glass fiber resin prepreg according to claim 6, characterized in that: The graphene and resin are mixed for 30 to 60 minutes.

8. The method for preparing a graphene-reinforced glass fiber resin prepreg according to claim 7, characterized in that: The coating amount of the coating is 30-45% by mass of the resin content per square meter of the glass fiber cloth reinforcement layer.

9. Use of the graphene-reinforced glass fiber resin prepreg according to any one of claims 1 to 5 in a mobile phone back cover.

10. The use according to claim 9, characterized in that: The method for preparing the mobile phone back cover comprises the following steps: The graphene reinforced glass fiber resin prepreg is cut according to the shape of the mobile phone back cover, and then multiple layers of graphene reinforced glass fiber resin prepreg are repeatedly arranged, and then cured and formed to obtain the mobile phone back cover.