阅读说明：本技术 一种碳纤维自行车架 (Carbon fiber bicycle frame ) 是由 陈汉杰 于 2021-08-25 设计创作，主要内容包括：本发明涉及自行车架技术领域,具体涉及一种碳纤维自行车架,通过若干碳纤维增强环氧树脂预浸料层叠热压成型,所述碳纤维增强环氧树脂预浸料由碳纤维层和环氧树脂复合粉末通过粉末浸渍成型。本发明减小了第一浸渍粉末中的增韧剂含量,并通过乳液聚合法合成聚丙烯酸酯纳米胶乳,干燥后即为聚丙烯酸纳米乳胶粒,与第一浸渍粉末混合,除了起到常规增韧剂的作用外,另一重要作用在于作为隔离剂分散于第一浸渍粉末中,从而减缓了环氧树脂成膜的进程,在第一浸渍粉末之间形成具有一定稳定性的通路,从而便于引出碳纤维的空气使第一浸渍粉末熔融进入碳纤维的空隙中,提高自行车架的整体性能以及降低了浸渍生产难度。(The invention relates to the technical field of bicycle frames, in particular to a carbon fiber bicycle frame, which is formed by laminating and hot-pressing a plurality of carbon fiber reinforced epoxy resin prepregs, wherein the carbon fiber reinforced epoxy resin prepregs are formed by impregnating carbon fiber layers and epoxy resin composite powder through powder. The content of the toughening agent in the first dipping powder is reduced, the polyacrylate nano latex is synthesized by an emulsion polymerization method, and the polyacrylate nano latex is dried to obtain the polyacrylic acid nano latex particles which are mixed with the first dipping powder.)

1. The utility model provides a carbon fiber bicycle frame which characterized in that: the carbon fiber reinforced epoxy resin prepreg is formed by laminating and hot-pressing a plurality of carbon fiber reinforced epoxy resin prepregs, wherein the carbon fiber reinforced epoxy resin prepregs are formed by impregnating carbon fiber layers and epoxy resin composite powder, and the epoxy resin composite powder is prepared by the following method:

(1) weighing 100 parts by weight of epoxy resin, 6-10 parts by weight of curing agent, 0.5-0.9 part by weight of curing accelerator, 10-20 parts by weight of flexibilizer, 1-2 parts by weight of antioxidant and 4-6 parts by weight of lubricant, mixing, adding into a double-screw extruder, carrying out melt extrusion granulation, and carrying out air flow crushing on obtained particles to obtain first impregnation powder;

(2) adding 0.1-0.5 part by weight of emulsifier into 100 parts by weight of deionized water, stirring uniformly, adding 6-10 parts by weight of methyl methacrylate, 8-12 parts by weight of butyl acrylate, 2-4 parts by weight of acrylic acid and 0.01-0.05 part by weight of initiator, heating to 65-75 ℃, carrying out heat preservation reaction for 60-90min, then dropwise adding 4-6 parts by weight of methyl methacrylate, 7-9 parts by weight of butyl acrylate, 2-4 parts by weight of glycidyl methacrylate and 0.01-0.05 part by weight of initiator at constant speed, carrying out heat preservation reaction for 60-90min after dropwise adding is finished, and obtaining polyacrylate nano latex;

(3) adding carbon nano tubes into the polyacrylate nano latex, performing demulsification, precipitation, filtration, washing and drying after ultrasonic dispersion to obtain second dipping powder, wherein the addition amount of the carbon nano tubes is 1-3 wt% of the polyacrylate nano latex;

(4) and adding the first impregnation powder and the second impregnation powder into a high-speed mixer according to the weight ratio of 10:1-2, and mixing to obtain the epoxy resin composite powder.

2. A carbon fiber bicycle frame according to claim 1, characterized in that: the epoxy resin is composed of epoxy resin E-51 and epoxy resin E-44 according to the weight ratio of 3: 1.

3. A carbon fiber bicycle frame according to claim 1, characterized in that: the curing agent is dicyandiamide curing agent, and the curing accelerator is urea accelerator.

4. A carbon fiber bicycle frame according to claim 1, characterized in that: the toughening agent is at least one of carboxyl-terminated nitrile rubber, hydroxyl-terminated nitrile rubber and amino-terminated nitrile rubber, the antioxidant is antioxidant 168 and/or antioxidant 1010, and the lubricant is calcium stearate.

5. A carbon fiber bicycle frame according to claim 1, characterized in that: the average particle size of the first dipping powder is 40-50 mu m, the average particle size of the latex particles of the polyacrylate nano latex is 160-230nm, and the average tube diameter of the carbon nano tube is 20-30 nm.

6. A carbon fiber bicycle frame according to claim 1, characterized in that: the emulsifier is sodium dodecyl sulfate, and the initiator is potassium persulfate or ammonium persulfate.

7. A carbon fiber bicycle frame according to claim 1, characterized in that: the powder dipping and molding operation comprises the following steps: spreading epoxy resin composite powder on the upper surface and the lower surface of the carbon fiber layer, covering a layer of separation film on the surface of the epoxy resin composite powder, putting the epoxy resin composite powder into a mould for hot press molding at the temperature of 80-100 ℃, under the hot press pressure of 1-2MPa for 6-10min, cooling, and stripping the separation film to obtain the carbon fiber reinforced epoxy resin prepreg.

8. A carbon fiber bicycle frame according to claim 1, characterized in that: the resin content in the carbon fiber reinforced epoxy resin prepreg is 40-50 wt%.

9. A carbon fiber bicycle frame according to claim 1, characterized in that: the carbon fiber layer is carbon fiber T300, the bicycle frame is formed by laminating and hot-pressing 8-10 layers of carbon fiber reinforced epoxy resin prepreg, the hot-pressing temperature is 130-140 ℃, the hot-pressing pressure is 1-2MPa, and the hot-pressing time is 10-20 min.

Technical Field

The invention relates to the technical field of bicycle frames, in particular to a carbon fiber bicycle frame.

Background

The carbon fiber not only has the inherent characteristic of a carbon material, but also has the soft processability of textile fiber, and is used for manufacturing the bicycle frame, so that the bicycle frame has the characteristics of light weight, high strength and good impact resistance. The carbon fiber composite material is generally prepared by a solution method, a hot melt method and a powder method.

The solution method is a method in which a continuous fiber or fabric is impregnated with an organic solution containing a matrix resin, and a solvent having a low boiling point is removed by high-temperature drying to obtain a prepreg. The disadvantages are high content of volatile components in the prepreg and environmental pollution.

The hot melting method comprises the steps of preparing matrix resin into resin adhesive films with uniform thickness, then compounding two resin adhesive films with one layer of continuous fiber or fabric to form an interlayer structure, and then carrying out hot melting on the resin adhesive films at a certain temperature and under a certain pressure and impregnating the resin adhesive films into the fiber or fabric to form the prepreg. Its advantages are low content of volatile components, no environmental pollution, complex technological process, high viscosity of raw materials, long mixing time and high defoaming effect.

The powder method is characterized in that dry resin powder is spread on the surface of carbon fibers and then heated and melted to infiltrate the dry resin powder into the carbon fiber layer and form a continuous resin film, the powder method is simple in process, but the requirements on the particle size of the resin powder and the melt flowability of the resin powder are high, and the resin film is easy to have performance difference, so that the defect that the rigidity or the toughness of the carbon fiber bicycle frame is insufficient is easy to occur.

Disclosure of Invention

In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a carbon fiber bicycle frame which has good rigidity and impact resistance, is produced by a powder impregnation method and is easy to industrially produce.

The purpose of the invention is realized by the following technical scheme:

a carbon fiber bicycle frame is formed by laminating and hot-pressing a plurality of carbon fiber reinforced epoxy resin prepregs, wherein the carbon fiber reinforced epoxy resin prepregs are formed by carbon fiber layers and epoxy resin composite powder through powder impregnation, and the epoxy resin composite powder is prepared by the following method:

(1) weighing 100 parts by weight of epoxy resin, 6-10 parts by weight of curing agent, 0.5-0.9 part by weight of curing accelerator, 10-20 parts by weight of flexibilizer, 1-2 parts by weight of antioxidant and 4-6 parts by weight of lubricant, mixing, adding into a double-screw extruder, carrying out melt extrusion granulation, and carrying out air flow crushing on obtained particles to obtain first impregnation powder;

(2) adding 0.1-0.5 part by weight of emulsifier into 100 parts by weight of deionized water, stirring uniformly, adding 6-10 parts by weight of methyl methacrylate, 8-12 parts by weight of butyl acrylate, 2-4 parts by weight of acrylic acid and 0.01-0.05 part by weight of initiator, heating to 65-75 ℃, carrying out heat preservation reaction for 60-90min, then dropwise adding 4-6 parts by weight of methyl methacrylate, 7-9 parts by weight of butyl acrylate, 2-4 parts by weight of glycidyl methacrylate and 0.01-0.05 part by weight of initiator at constant speed, carrying out heat preservation reaction for 60-90min after dropwise adding is finished, and obtaining polyacrylate nano latex;

(3) adding carbon nano tubes into the polyacrylate nano latex, performing demulsification, precipitation, filtration, washing and drying after ultrasonic dispersion to obtain second dipping powder, wherein the addition amount of the carbon nano tubes is 1-3 wt% of the polyacrylate nano latex;

(4) and adding the first impregnation powder and the second impregnation powder into a high-speed mixer according to the weight ratio of 10:1-2, and mixing to obtain the epoxy resin composite powder.

In order to improve the toughness of the epoxy resin adhesive film, a large amount of toughening agent is generally added into the epoxy resin for modification, and then the epoxy resin is prepared into resin powder. However, the toughening agent can form a sea-island structure in the epoxy resin, so that the melt flowability of the epoxy resin is reduced, the epoxy resin is difficult to infiltrate the gaps among the carbon fibers, structural layering or uneven resin thickness is easily caused, in addition, air needs to be discharged correspondingly in the process of infiltrating the gaps among the carbon fibers by the epoxy resin, but the air cannot be discharged easily due to continuous film forming of the epoxy resin, so that the infiltration difficulty is improved, and the influence on the overall mechanical property and batch quality stability of the carbon fiber bicycle frame is large.

The content of the toughening agent in the first dipping powder is reduced, the polyacrylate nano latex is synthesized by an emulsion polymerization method, and the polyacrylate nano latex is dried to obtain the polyacrylic acid nano latex particles which are mixed with the first dipping powder. Secondly, in order to improve the dispersion uniformity and the stability of the air passage, the carbon nano tube is added into the second impregnation powder, the first impregnation powder, the polyacrylate emulsion particle and the carbon nano tube can be fully filled with each other as three substances with different particle sizes, the dispersion uniformity is improved, and the carbon nano tube is hollow and does not participate in the melting characteristic, so that the stability of the air passage is improved, and the infiltration performance of the epoxy resin composite powder is improved. In the synthesis of polyacrylate nano latex, glycidyl methacrylate is added in the dropping process to introduce epoxy group, so that the epoxy resin and the epoxy resin can be crosslinked under the action of a curing agent in the dipping and forming process, and thus, although a large phase separation (air passage) exists in the initial stage of the dipping and forming process, a continuous and stable resin film can be formed through the crosslinking action in the later stage of the dipping and forming process, so that the whole mechanical property expression is improved. In addition, the second impregnated powder synthesized by the invention also has a remarkable improvement effect on the impact resistance of the composite material.

Wherein the epoxy resin is composed of epoxy resin E-51 and epoxy resin E-44 according to the weight ratio of 3: 1.

The curing agent is dicyandiamide curing agent, and the curing accelerator is urea accelerator.

The toughening agent is at least one of carboxyl-terminated nitrile rubber, hydroxyl-terminated nitrile rubber and amino-terminated nitrile rubber, the antioxidant is antioxidant 168 and/or antioxidant 1010, and the lubricant is calcium stearate.

Wherein the average particle size of the first dipping powder is 40-50 μm, the average particle size of the latex particles of the polyacrylate nano-latex is 160-230nm, and the average tube diameter of the carbon nano-tube is 20-30 nm.

Wherein the emulsifier is sodium dodecyl sulfate, and the initiator is potassium persulfate or ammonium persulfate.

Wherein the powder dipping and molding operation comprises the following steps: spreading epoxy resin composite powder on the upper surface and the lower surface of the carbon fiber layer, covering a layer of separation film on the surface of the epoxy resin composite powder, putting the epoxy resin composite powder into a mould for hot press molding at the temperature of 80-100 ℃, under the hot press pressure of 1-2MPa for 6-10min, cooling, and stripping the separation film to obtain the carbon fiber reinforced epoxy resin prepreg.

Wherein the resin content in the carbon fiber reinforced epoxy resin prepreg is 40-50 wt%.

The bicycle frame is formed by laminating and hot-pressing 8-10 layers of carbon fiber reinforced epoxy resin prepreg at the hot-pressing temperature of 130-140 ℃, the hot-pressing pressure of 1-2MPa and the hot-pressing time of 10-20 min.

The invention has the beneficial effects that: the content of the toughening agent in the first dipping powder is reduced, the polyacrylate nano latex is synthesized by an emulsion polymerization method, and the polyacrylate nano latex is dried to obtain the polyacrylic acid nano latex particles which are mixed with the first dipping powder. Secondly, in order to improve the dispersion uniformity and the stability of the air passage, the carbon nano tube is added into the second impregnation powder, the first impregnation powder, the polyacrylate emulsion particle and the carbon nano tube can be fully filled with each other as three substances with different particle sizes, the dispersion uniformity is improved, and the carbon nano tube is hollow and does not participate in the melting characteristic, so that the stability of the air passage is improved, and the infiltration performance of the epoxy resin composite powder is improved. In the synthesis of polyacrylate nano latex, glycidyl methacrylate is added in the dropping process to introduce epoxy group, so that the epoxy resin and the epoxy resin can be crosslinked under the action of a curing agent in the dipping and forming process, and thus, although a large phase separation (air passage) exists in the initial stage of the dipping and forming process, a continuous and stable resin film can be formed through the crosslinking action in the later stage of the dipping and forming process, so that the whole mechanical property expression is improved. In addition, the second impregnated powder synthesized by the invention also has a remarkable improvement effect on the impact resistance of the composite material.

Detailed Description

The present invention will be further described with reference to the following examples for facilitating understanding of those skilled in the art, and the description of the embodiments is not intended to limit the present invention.

Example 1

A carbon fiber bicycle frame is formed by laminating and hot-pressing a plurality of carbon fiber reinforced epoxy resin prepregs, wherein the carbon fiber reinforced epoxy resin prepregs are formed by carbon fiber layers and epoxy resin composite powder through powder impregnation, and the epoxy resin composite powder is prepared by the following method:

(1) weighing 100 parts by weight of epoxy resin, 8 parts by weight of curing agent, 0.7 part by weight of curing accelerator, 15 parts by weight of flexibilizer, 1.5 parts by weight of antioxidant and 5 parts by weight of lubricant, mixing, adding into a double-screw extruder, carrying out melt extrusion granulation, and carrying out air flow crushing on obtained particles to obtain first impregnation powder;

(2) adding 0.3 weight part of emulsifier into 100 weight parts of deionized water, stirring uniformly, adding 8 weight parts of methyl methacrylate, 10 weight parts of butyl acrylate, 3 weight parts of acrylic acid and 0.03 weight part of initiator, heating to 70 ℃, carrying out heat preservation reaction for 75min, then dropwise adding 5 weight parts of methyl methacrylate, 8 weight parts of butyl acrylate, 3 weight parts of glycidyl methacrylate and 0.03 weight part of initiator at constant speed, carrying out heat preservation reaction for 75min after dropwise adding is finished, and obtaining polyacrylate nano latex;

(3) adding carbon nano tubes into the polyacrylate nano latex, performing demulsification, precipitation, filtration, washing and drying after ultrasonic dispersion to obtain second dipping powder, wherein the addition amount of the carbon nano tubes is 2 wt% of the polyacrylate nano latex;

(4) and adding the first impregnation powder and the second impregnation powder into a high-speed mixer according to the weight ratio of 10:1.5, and mixing to obtain the epoxy resin composite powder.

Wherein the epoxy resin is composed of epoxy resin E-51 and epoxy resin E-44 according to the weight ratio of 3: 1.

The curing agent is dicyandiamide curing agent, and the curing accelerator is urea accelerator.

The toughening agent is carboxyl-terminated butadiene-acrylonitrile rubber, the antioxidant is a mixture of an antioxidant 168 and an antioxidant 1010 in a weight ratio of 1:1, and the lubricant is calcium stearate.

Wherein the average particle size of the first dipping powder is 43 μm, the average particle size of the latex particles of the polyacrylate nano-latex is 180nm, and the average tube diameter of the carbon nano-tube is 25 nm.

Wherein the emulsifier is sodium dodecyl sulfate, and the initiator is potassium persulfate

Wherein the powder dipping and molding operation comprises the following steps: and (2) after the epoxy resin composite powder is spread on the upper surface and the lower surface of the carbon fiber layer, covering a layer of separation film on the surface of the epoxy resin composite powder, putting the epoxy resin composite powder into a mould for hot press forming at the temperature of 90 ℃, the hot press pressure of 1.5MPa and the hot press time of 8min, cooling, and stripping the separation film to obtain the carbon fiber reinforced epoxy resin prepreg.

Wherein the resin content in the carbon fiber reinforced epoxy resin prepreg is 45 wt%.

The bicycle frame is formed by laminating and hot-pressing 9 layers of carbon fiber reinforced epoxy resin prepregs at the hot-pressing temperature of 135 ℃, the hot-pressing pressure of 1.5MPa and the hot-pressing time of 15 min.

Example 2

A carbon fiber bicycle frame is formed by laminating and hot-pressing a plurality of carbon fiber reinforced epoxy resin prepregs, wherein the carbon fiber reinforced epoxy resin prepregs are formed by carbon fiber layers and epoxy resin composite powder through powder impregnation, and the epoxy resin composite powder is prepared by the following method:

(1) weighing 100 parts by weight of epoxy resin, 6 parts by weight of curing agent, 0.5 part by weight of curing accelerator, 10 parts by weight of flexibilizer, 1 part by weight of antioxidant and 4 parts by weight of lubricant, mixing, adding into a double-screw extruder for melt extrusion granulation, and carrying out air flow crushing on obtained particles to obtain first impregnation powder;

(2) adding 0.1 part by weight of emulsifier into 100 parts by weight of deionized water, stirring uniformly, adding 6 parts by weight of methyl methacrylate, 8 parts by weight of butyl acrylate, 2 parts by weight of acrylic acid and 0.01 part by weight of initiator, heating to 65 ℃, carrying out heat preservation reaction for 60min, then dropwise adding 4 parts by weight of methyl methacrylate, 7 parts by weight of butyl acrylate, 2 parts by weight of glycidyl methacrylate and 0.01 part by weight of initiator at constant speed, and carrying out heat preservation reaction for 60min after dropwise adding is finished, thus obtaining polyacrylate nano latex;

(3) adding carbon nano tubes into the polyacrylate nano latex, performing demulsification, precipitation, filtration, washing and drying after ultrasonic dispersion to obtain second dipping powder, wherein the addition amount of the carbon nano tubes is 1 wt% of the polyacrylate nano latex;

(4) and adding the first impregnation powder and the second impregnation powder into a high-speed mixer according to the weight ratio of 10:1, and mixing to obtain the epoxy resin composite powder.

Wherein the epoxy resin is composed of epoxy resin E-51 and epoxy resin E-44 according to the weight ratio of 3: 1.

The curing agent is dicyandiamide curing agent, and the curing accelerator is urea accelerator.

The toughening agent is hydroxyl-terminated nitrile rubber, the antioxidant is antioxidant 168, and the lubricant is calcium stearate.

The average particle size of the first dipping powder is 40 mu m, the average particle size of the latex particles of the polyacrylate nano latex is 160nm, and the average pipe diameter of the carbon nano tube is 20 nm.

Wherein the emulsifier is sodium dodecyl sulfate, and the initiator is ammonium persulfate.

Wherein the powder dipping and molding operation comprises the following steps: and (2) spreading epoxy resin composite powder on the upper surface and the lower surface of the carbon fiber layer, covering a layer of separation film on the surface of the epoxy resin composite powder, putting the epoxy resin composite powder into a mould for hot press molding at the temperature of 80 ℃, under the hot press pressure of 1MPa for 6min, cooling, and stripping the separation film to obtain the carbon fiber reinforced epoxy resin prepreg.

Wherein the resin content in the carbon fiber reinforced epoxy resin prepreg is 40 wt%.

The bicycle frame is formed by laminating and hot-pressing 8 layers of carbon fiber reinforced epoxy resin prepregs at the hot-pressing temperature of 130 ℃, the hot-pressing pressure of 1MPa and the hot-pressing time of 10 min.

Example 3

A carbon fiber bicycle frame is formed by laminating and hot-pressing a plurality of carbon fiber reinforced epoxy resin prepregs, wherein the carbon fiber reinforced epoxy resin prepregs are formed by carbon fiber layers and epoxy resin composite powder through powder impregnation, and the epoxy resin composite powder is prepared by the following method:

(1) weighing 100 parts by weight of epoxy resin, 10 parts by weight of curing agent, 0.9 part by weight of curing accelerator, 20 parts by weight of flexibilizer, 2 parts by weight of antioxidant and 6 parts by weight of lubricant, mixing, adding into a double-screw extruder, carrying out melt extrusion granulation, and carrying out air flow crushing on obtained particles to obtain first impregnation powder;

(2) adding 0.5 weight part of emulsifier into 100 weight parts of deionized water, stirring uniformly, adding 10 weight parts of methyl methacrylate, 12 weight parts of butyl acrylate, 4 weight parts of acrylic acid and 0.05 weight part of initiator, heating to 75 ℃, carrying out heat preservation reaction for 90min, then dropwise adding 6 weight parts of methyl methacrylate, 9 weight parts of butyl acrylate, 4 weight parts of glycidyl methacrylate and 0.05 weight part of initiator at constant speed, and carrying out heat preservation reaction for 90min after dropwise adding is finished, thus obtaining polyacrylate nano latex;

(3) adding carbon nano tubes into the polyacrylate nano latex, performing demulsification, precipitation, filtration, washing and drying after ultrasonic dispersion to obtain second dipping powder, wherein the addition amount of the carbon nano tubes is 3 wt% of the polyacrylate nano latex;

(4) and adding the first impregnation powder and the second impregnation powder into a high-speed mixer according to the weight ratio of 10:2, and mixing to obtain the epoxy resin composite powder.

Wherein the epoxy resin is composed of epoxy resin E-51 and epoxy resin E-44 according to the weight ratio of 3: 1.

The curing agent is dicyandiamide curing agent, and the curing accelerator is urea accelerator.

The toughening agent is amino-terminated nitrile rubber, the antioxidant is antioxidant 1010, and the lubricant is calcium stearate.

Wherein the average particle size of the first dipping powder is 50 μm, the average particle size of the latex particles of the polyacrylate nano-latex is 230nm, and the average tube diameter of the carbon nano-tube is 30 nm.

Wherein the emulsifier is sodium dodecyl sulfate, and the initiator is ammonium persulfate.

Wherein the powder dipping and molding operation comprises the following steps: and (2) after the epoxy resin composite powder is spread on the upper surface and the lower surface of the carbon fiber layer, covering a layer of separation film on the surface of the epoxy resin composite powder, putting the epoxy resin composite powder into a mould for hot press forming at the temperature of 100 ℃, under the hot press pressure of 2MPa for 10min, cooling, and stripping the separation film to obtain the carbon fiber reinforced epoxy resin prepreg.

Wherein the resin content in the carbon fiber reinforced epoxy resin prepreg is 50 wt%.

The bicycle frame is formed by laminating and hot-pressing 10 layers of carbon fiber reinforced epoxy resin prepregs at the hot-pressing temperature of 140 ℃, the hot-pressing pressure of 2MPa and the hot-pressing time of 20 min.

Comparative example 1

This comparative example differs from example 1 in that:

the epoxy resin composite powder is prepared by the following method:

weighing 100 parts by weight of epoxy resin, 8 parts by weight of curing agent, 0.7 part by weight of curing accelerator, 30 parts by weight of flexibilizer, 1.5 parts by weight of antioxidant and 5 parts by weight of lubricant, mixing, adding into a double-screw extruder, carrying out melt extrusion granulation, and carrying out air flow crushing on obtained particles to obtain epoxy resin composite powder.

Comparative example 2

This comparative example differs from example 1 in that:

the epoxy resin composite powder is prepared by the following method:

(1) adding 0.3 weight part of emulsifier into 100 weight parts of deionized water, stirring uniformly, adding 8 weight parts of methyl methacrylate, 10 weight parts of butyl acrylate, 3 weight parts of acrylic acid and 0.03 weight part of initiator, heating to 70 ℃, carrying out heat preservation reaction for 75min, then dropwise adding 5 weight parts of methyl methacrylate, 8 weight parts of butyl acrylate, 3 weight parts of glycidyl methacrylate and 0.03 weight part of initiator at constant speed, carrying out heat preservation reaction for 75min after dropwise adding is finished, and obtaining polyacrylate nano latex;

(2) adding carbon nano tubes into the polyacrylate nano latex, performing demulsification, precipitation, filtration, washing and drying after ultrasonic dispersion to obtain dipping powder, wherein the addition amount of the carbon nano tubes is 2 wt% of the polyacrylate nano latex;

(3) weighing 100 parts by weight of epoxy resin, 8 parts by weight of curing agent, 0.7 part by weight of curing accelerator, 15 parts by weight of toughening agent, 15 parts by weight of impregnating powder, 1.5 parts by weight of antioxidant and 5 parts by weight of lubricant, mixing, adding into a double-screw extruder, carrying out melt extrusion granulation, and carrying out air flow crushing on obtained particles to obtain epoxy resin composite powder.

The carbon fiber bicycle frames of example 1, comparative example 1 and comparative example 2 were tested according to ISO4210, and the test indexes and results are as follows:

through tests, all the test items in the embodiment 1 meet the index requirements, the comparative example 1 only meets the index requirements on the five-way rigidity and the head pipe rigidity, and the comparative example 2 does not meet the index requirements on the five-way pedal force fatigue, the vibration fatigue and the head pipe horizontal fatigue tests.

The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.