Preparation process of high-strength carbon fiber pipe

Abstract

The invention discloses a preparation process of a high-strength carbon fiber pipe, and relates to the technical field of carbon fiber pipes. The invention relates to a preparation process of a high-strength carbon fiber pipe. The preparation process comprises the following steps: S1, preparing a carbon fiber prepreg; s2, preparing a reinforced inner layer; s3, preparing a reinforcing layer; s4, the prepared reinforcing layer is evenly laid on the carbon fiber prepreg, then the prepared reinforcing inner layer is laid on the reinforcing layer, and a carbon fiber base layer is obtained; s5, the metal core rod is coated with a release agent; the carbon fiber prepreg and the reinforcing inner layer are combined for use, the overall strength, wear resistance and corrosion resistance of the carbon fiber pipe can be obviously improved, meanwhile, the reinforcing layers are additionally arranged in the carbon fiber prepreg and the reinforcing inner layer, on one hand, the local strength of the carbon fiber pipe can be effectively enhanced, on the other hand, the heat resistance of the carbon fiber pipe can be enhanced, and the service life of the carbon fiber pipe is prolonged. And the device can be suitable for different use environments.

Description

Technical Field

[0001] The invention belongs to the technical field of carbon fiber tubes, and in particular relates to a preparation process of high-strength carbon fiber tubes. Background Art

[0002] As a new type of structural material, carbon fiber composite material is one of the ideal materials for building high-performance products. Carbon fiber composite material has excellent physical properties, good specific strength, high specific stiffness, and its mechanical properties can be controlled and changed through design; carbon fiber has high strength, high modulus, high temperature resistance, corrosion resistance, fatigue resistance, creep resistance, electrical conductivity, heat transfer and other characteristics. It is a typical high-tech product and has been widely used in aerospace, sports goods, industrial, transportation and civil construction fields. At present, carbon fiber pipe fittings are widely used for their excellent performance.

[0003] However, the overall strength performance of the carbon fiber tube in the prior art is not very high. Not only is the structure complex, but also the function is single, the toughness is poor, and it is easy to break locally when bent. The overall strength needs to be further improved. At the same time, when the carbon fiber tube in the prior art is in use, the pressure intensity at different positions may be different, and the heat resistance of the carbon fiber tube in the prior art is generally not high, and it may not be able to adapt to different usage environments. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a high-strength carbon fiber tube preparation process that can overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a high-strength carbon fiber tube preparation process, comprising the following steps:

[0006] Step S1, preparing carbon fiber prepreg;

[0007] Step S2, preparing a reinforced inner layer;

[0008] Step S3, preparing a reinforcement layer;

[0009] Step S4, evenly laying the prepared reinforcement layer on the carbon fiber prepreg, and then laying the prepared reinforcement inner layer on the reinforcement layer to obtain a carbon fiber base layer;

[0010] Step S5, coating a release agent on the metal core rod;

[0011] Step S6, rolling the carbon fiber base layer onto a metal core rod coated with a release agent to obtain a carbon fiber base tube;

[0012] Step S7, wrapping a wrapping film on the carbon fiber base tube;

[0013] Step S8, placing the carbon fiber base tube wrapped with the winding film into an oven for curing;

[0014] Step S9, taking out the cured carbon fiber base tube, and removing the surface wrapping film to obtain a carbon fiber tube;

[0015] In step S3, the reinforcing layers are provided in multiple groups, and the multiple groups of reinforcing layers are evenly laid on the carbon fiber prepreg, and the spacing between two adjacent groups of reinforcing layers is 10-20 cm;

[0016] The mass components of the reinforcing layer are: 50-60 parts of carbon fiber cloth, 30-40 parts of epoxy resin emulsion, and 5-10 parts of reinforcing agent;

[0017] The preparation steps of the reinforcement layer include:

[0018] Step S301, treating the surface of the carbon fiber cloth;

[0019] Step S302, adding a reinforcing agent into the epoxy resin emulsion, and fully heating and stirring for 20-30 minutes to obtain a reinforcing base liquid;

[0020] Step S303, evenly applying the mixed reinforcing base liquid on the treated carbon fiber cloth;

[0021] Step S304, placing the carbon fiber cloth coated with the reinforcing base liquid in a dark place to dry in the shade;

[0022] Step S305: Use a cutting machine to cut the fully air-dried carbon fiber cloth into reinforcement layers of the same size.

[0023] Furthermore, the mass components of the carbon fiber prepreg in step S1 are: 35-45 parts of modified resin, 50-60 parts of carbon fiber, and 5-10 parts of reinforcing agent;

[0024] The preparation steps of the carbon fiber prepreg include:

[0025] Step S101, taking the modified resin and adding it into a stirring device for high-speed crushing and stirring;

[0026] Step S102, heating the stirring device, adding the reinforcing agent into the stirring device, and stirring again for 30 minutes to obtain a modified adhesive solution;

[0027] Step S103, applying the glue prepared in step S102 on the release paper;

[0028] Step S104, placing the release paper coated with glue between the pressure rollers;

[0029] Step S105, performing surface treatment on the carbon fiber;

[0030] Step S106, passing the treated carbon fiber through a pressing roller;

[0031] Step S107, the pressing roller is heated up, and the carbon fiber is slowly passed through the pressing roller, pressed and cooled to obtain the carbon fiber prepreg.

[0032] Furthermore, the modified resin in step S101 includes high-performance resin and bio-based resin.

[0033] Furthermore, in the step S105, when the carbon fiber is subjected to surface treatment, plasma treatment and ultraviolet treatment are included;

[0034] During the plasma treatment, the carbon fibers are fed into a plasma treatment chamber, and the plasma in the plasma treatment chamber impacts the surface of the carbon fibers to increase the surface roughness of the carbon fibers.

[0035] Furthermore, the mass components of the reinforced inner layer in step S2 are: 30-35 parts of reinforcing resin, 30-35 parts of carbon fiber, and 30-35 parts of reinforcing fiber;

[0036] The steps of preparing the reinforced inner layer include:

[0037] Step S201, putting carbon fiber and reinforcing fiber into a grinder for grinding;

[0038] Step S202, sieving the crushed carbon fiber and reinforcing fiber;

[0039] Step S203, pouring the reinforced resin into a stirring device for high-speed crushing and stirring;

[0040] Step S204, heating the stirring device to melt the crushed resin in the stirring device;

[0041] Step S205, adding the sieved carbon fiber and reinforcing fiber into a stirring device;

[0042] Step S206, continue to heat up the stirring device and stir thoroughly for 30 minutes;

[0043] Step S207, obtaining a reinforced base liquid after heat preservation;

[0044] Step S208, pouring the strengthening base liquid into the extruder to extrude the strengthening filaments;

[0045] Step S209: braiding the extruded reinforcing filaments to obtain a reinforced inner layer.

[0046] Furthermore, the reinforcing fibers include glass fibers, silicon carbide whiskers, stainless steel fibers and ultra-high molecular weight polyethylene fibers.

[0047] Still further, the mass ratio of the glass fiber, silicon carbide whisker, stainless steel fiber and ultra-high molecular weight polyethylene fiber is 1:1:1:1.

[0048] Furthermore, the thickness ratio of the carbon fiber prepreg to the reinforcing inner layer is 4:1.

[0049] Furthermore, the curing furnace temperature is 110-130° C., and the curing time is 80-100 min.

[0050] Furthermore, in step S202, when the crushed carbon fiber and reinforcing fiber are screened, the mesh number of the screen is 10-30 meshes.

[0051] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art: the present invention adopts a combination of carbon fiber prepreg and reinforced inner layer when preparing carbon fiber tubes, which can significantly improve the overall strength, wear resistance and corrosion resistance of carbon fiber tubes. At the same time, a reinforcement layer is added to the carbon fiber prepreg and the reinforced inner layer, which can effectively enhance the local strength of the carbon fiber tube on the one hand, and enhance the heat resistance of the carbon fiber tube on the other hand, so that it can be suitable for different use environments. DETAILED DESCRIPTION

[0052] Embodiment 1:

[0053] A high-strength carbon fiber tube preparation process comprises the following steps:

[0054] Step S1, preparing carbon fiber prepreg;

[0055] Step S2, preparing a reinforced inner layer;

[0056] Step S3, preparing a reinforcement layer;

[0057] Step S4, evenly laying the prepared reinforcement layer on the carbon fiber prepreg, and then laying the prepared reinforcement inner layer on the reinforcement layer to obtain a carbon fiber base layer;

[0058] Step S5, coating a release agent on the metal core rod;

[0059] Step S6, rolling the carbon fiber base layer onto a metal core rod coated with a release agent to obtain a carbon fiber base tube;

[0060] Step S7, wrapping a wrapping film on the carbon fiber base tube;

[0061] Step S8, placing the carbon fiber base tube wrapped with the winding film into an oven for curing;

[0062] Step S9, taking out the cured carbon fiber base tube, and removing the surface wrapping film to obtain a carbon fiber tube;

[0063] In step S3, multiple groups of reinforcing layers are provided, and the multiple groups of reinforcing layers are evenly laid on the carbon fiber prepreg, and the spacing between two adjacent groups of reinforcing layers is 15 cm;

[0064] The mass components of the reinforcing layer are: 55 parts of carbon fiber cloth, 35 parts of epoxy resin emulsion, and 10 parts of reinforcing agent;

[0065] The steps of preparing the reinforcement layer include:

[0066] Step S301, treating the surface of the carbon fiber cloth;

[0067] Step S302, adding a reinforcing agent into the epoxy resin emulsion, and fully heating and stirring for 20-30 minutes to obtain a reinforcing base liquid;

[0068] Step S303, evenly applying the mixed reinforcing base liquid on the treated carbon fiber cloth;

[0069] Step S304, placing the carbon fiber cloth coated with the reinforcing base liquid in a dark place to dry in the shade;

[0070] Step S305: Use a cutting machine to cut the fully air-dried carbon fiber cloth into reinforcement layers of the same size.

[0071] The reinforcing agent is nano-alumina particles.

[0072] Epoxy resin emulsion is the product of heating and stirring water, emulsifier, thickener, epoxy resin and modifier.

[0073] The modifier is any one of hexagonal boron nitride, nano silicon dioxide and silicone resin.

[0074] The shade drying time in step S304 is 18 days.

[0075] The thickness of the reinforcement base liquid applied in step S303 is 5 mm.

[0076] It should be noted that during the processing of the carbon fiber tube, an insulation ring can be used to insulate the area where the reinforcement layer is laid, and the insulation temperature is 35°C and the insulation time is 3.5 hours.

[0077] By insulating the area where the reinforcement layer is laid, the fit between the reinforcement layer and the carbon fiber prepreg can be effectively enhanced, thereby ensuring the local reinforcement effect after the subsequent production of the carbon fiber tube.

[0078] The mass components of the carbon fiber prepreg in step S1 are: 40 parts of modified resin, 55 parts of carbon fiber, and 8 parts of reinforcing agent;

[0079] The preparation steps of carbon fiber prepreg include:

[0080] Step S101, taking the modified resin and adding it into a stirring device for high-speed crushing and stirring;

[0081] Step S102, heating the stirring device, adding the reinforcing agent into the stirring device, and stirring again for 30 minutes to obtain a modified adhesive solution;

[0082] Step S103, applying the glue prepared in step S102 on the release paper;

[0083] Step S104, placing the release paper coated with glue between the pressure rollers;

[0084] Step S105, performing surface treatment on the carbon fiber;

[0085] Step S106, passing the treated carbon fiber through a pressing roller;

[0086] Step S107, the pressing roller is heated up, and the carbon fiber is slowly passed through the pressing roller, pressed and cooled to obtain the carbon fiber prepreg.

[0087] The modified resin in step S101 includes a high-performance resin and a bio-based resin.

[0088] In step S105, when the carbon fiber is subjected to surface treatment, plasma treatment and ultraviolet treatment are included;

[0089] During plasma treatment, the carbon fiber is fed into a plasma treatment chamber, and the plasma in the plasma treatment chamber impacts the surface of the carbon fiber, increasing the surface roughness of the carbon fiber.

[0090] The mass composition of the reinforced inner layer in step S2 is: 33 parts of reinforcing resin, 33 parts of carbon fiber, and 34 parts of reinforcing fiber;

[0091] The steps for preparing the reinforced inner layer include:

[0092] Step S201, putting carbon fiber and reinforcing fiber into a grinder for grinding;

[0093] Step S202, sieving the crushed carbon fiber and reinforcing fiber;

[0094] Step S203, pouring the reinforced resin into a stirring device for high-speed crushing and stirring;

[0095] Step S204, heating the stirring device to melt the crushed resin in the stirring device;

[0096] Step S205, adding the sieved carbon fiber and reinforcing fiber into a stirring device;

[0097] Step S206, continue to heat up the stirring device and stir thoroughly for 30 minutes;

[0098] Step S207, obtaining a reinforced base liquid after heat preservation;

[0099] Step S208, pouring the strengthening base liquid into the extruder to extrude the strengthening filaments;

[0100] Step S209: braiding the extruded reinforcing filaments to obtain a reinforced inner layer.

[0101] Reinforcement fibers include glass fibers, silicon carbide whiskers, stainless steel fibers, and ultra-high molecular weight polyethylene fibers.

[0102] The mass ratio of glass fiber, silicon carbide whisker, stainless steel fiber and ultra-high molecular weight polyethylene fiber is 1:1:1:1.

[0103] The thickness ratio of carbon fiber prepreg to the reinforcing inner layer is 4:1.

[0104] The curing oven temperature is 110-130°C and the curing time is 90 minutes.

[0105] In step S202, when the crushed carbon fiber and reinforcing fiber are screened, the mesh number of the screen is 20 meshes.

[0106] Embodiment 2:

[0107] A high-strength carbon fiber tube preparation process comprises the following steps:

[0108] Step S1, preparing carbon fiber prepreg;

[0109] Step S2, preparing a reinforced inner layer;

[0110] Step S3, laying the prepared reinforcing inner layer on the carbon fiber prepreg to obtain a carbon fiber base layer;

[0111] Step S4, coating a release agent on the metal core rod;

[0112] Step S5, rolling the carbon fiber base layer onto a metal core rod coated with a release agent to obtain a carbon fiber base tube;

[0113] Step S6, wrapping a wrapping film on the carbon fiber base tube;

[0114] Step S7, placing the carbon fiber base tube wrapped with the winding film into an oven for curing;

[0115] Step S8, taking out the cured carbon fiber base tube, and removing the surface wrapping film to obtain a carbon fiber tube.

[0116] The mass composition of the carbon fiber prepreg in step S1 is: 35 parts of modified resin, 50 parts of carbon fiber, and 5 parts of reinforcing agent;

[0117] The preparation steps of carbon fiber prepreg include:

[0118] Step S101, taking the modified resin and adding it into a stirring device for high-speed crushing and stirring;

[0119] Step S102, heating the stirring device, adding the reinforcing agent into the stirring device, and stirring again for 30 minutes to obtain a modified adhesive solution;

[0120] Step S103, applying the glue prepared in step S102 on the release paper;

[0121] Step S104, placing the release paper coated with glue between the pressure rollers;

[0122] Step S105, performing surface treatment on the carbon fiber;

[0123] Step S106, passing the treated carbon fiber through a pressing roller;

[0124] Step S107, the pressing roller is heated up, and the carbon fiber is slowly passed through the pressing roller, pressed and cooled to obtain the carbon fiber prepreg.

[0125] The modified resin in step S101 includes a high-performance resin and a bio-based resin.

[0126] In step S105, when the carbon fiber is subjected to surface treatment, plasma treatment and ultraviolet treatment are included;

[0127] During plasma treatment, the carbon fiber is fed into a plasma treatment chamber, and the plasma in the plasma treatment chamber impacts the surface of the carbon fiber, increasing the surface roughness of the carbon fiber.

[0128] The mass components of the reinforced inner layer in step S2 are: 30 parts of reinforcing resin, 30 parts of carbon fiber, and 40 parts of reinforcing fiber;

[0129] The steps for preparing the reinforced inner layer include:

[0130] Step S201, putting carbon fiber and reinforcing fiber into a grinder for grinding;

[0131] Step S202, sieving the crushed carbon fiber and reinforcing fiber;

[0132] Step S203, pouring the reinforced resin into a stirring device for high-speed crushing and stirring;

[0133] Step S204, heating the stirring device to melt the crushed resin in the stirring device;

[0134] Step S205, adding the sieved carbon fiber and reinforcing fiber into a stirring device;

[0135] Step S206, continue to heat up the stirring device and stir thoroughly for 30 minutes;

[0136] Step S207, obtaining a reinforced base liquid after heat preservation;

[0137] Step S208, pouring the strengthening base liquid into the extruder to extrude the strengthening filaments;

[0138] Step S209: braiding the extruded reinforcing filaments to obtain a reinforced inner layer.

[0139] Reinforcement fibers include glass fibers, silicon carbide whiskers, stainless steel fibers, and ultra-high molecular weight polyethylene fibers.

[0140] The mass ratio of glass fiber, silicon carbide whisker, stainless steel fiber and ultra-high molecular weight polyethylene fiber is 1:1:1:1.

[0141] The thickness ratio of carbon fiber prepreg to the reinforcing inner layer is 4:1.

[0142] The curing oven temperature is 110-130°C and the curing time is 90 minutes.

[0143] In step S202, when the crushed carbon fiber and reinforcing fiber are screened, the mesh number of the screen is 20 meshes.

[0144] Embodiment 3:

[0145] A high-strength carbon fiber tube preparation process comprises the following steps:

[0146] Step S1, preparing carbon fiber prepreg;

[0147] Step S2, preparing a reinforced inner layer;

[0148] Step S3, laying the prepared reinforcing inner layer on the carbon fiber prepreg to obtain a carbon fiber base layer;

[0149] Step S4, coating a release agent on the metal core rod;

[0150] Step S5, rolling the carbon fiber base layer onto a metal core rod coated with a release agent to obtain a carbon fiber base tube;

[0151] Step S6, wrapping a wrapping film on the carbon fiber base tube;

[0152] Step S7, placing the carbon fiber base tube wrapped with the winding film into an oven for curing;

[0153] Step S8, taking out the cured carbon fiber base tube, and removing the surface wrapping film to obtain a carbon fiber tube.

[0154] The mass components of the carbon fiber prepreg in step S1 are: 45 parts of modified resin, 60 parts of carbon fiber, and 10 parts of reinforcing agent;

[0155] The preparation steps of carbon fiber prepreg include:

[0156] Step S101, taking the modified resin and adding it into a stirring device for high-speed crushing and stirring;

[0157] Step S102, heating the stirring device, adding the reinforcing agent into the stirring device, and stirring again for 30 minutes to obtain a modified adhesive solution;

[0158] Step S103, applying the glue prepared in step S102 on the release paper;

[0159] Step S104, placing the release paper coated with glue between the pressure rollers;

[0160] Step S105, performing surface treatment on the carbon fiber;

[0161] Step S106, passing the treated carbon fiber through a pressing roller;

[0162] Step S107, the pressing roller is heated up, and the carbon fiber is slowly passed through the pressing roller, pressed and cooled to obtain the carbon fiber prepreg.

[0163] The modified resin in step S101 includes a high-performance resin and a bio-based resin.

[0164] In step S105, when the carbon fiber is subjected to surface treatment, plasma treatment and ultraviolet treatment are included;

[0165] During plasma treatment, the carbon fiber is fed into a plasma treatment chamber, and the plasma in the plasma treatment chamber impacts the surface of the carbon fiber, increasing the surface roughness of the carbon fiber.

[0166] The mass components of the reinforced inner layer in step S2 are: 40 parts of reinforcing resin, 30 parts of carbon fiber, and 30 parts of reinforcing fiber;

[0167] The steps for preparing the reinforced inner layer include:

[0168] Step S201, putting carbon fiber and reinforcing fiber into a grinder for grinding;

[0169] Step S202, sieving the crushed carbon fiber and reinforcing fiber;

[0170] Step S203, pouring the reinforced resin into a stirring device for high-speed crushing and stirring;

[0171] Step S204, heating the stirring device to melt the crushed resin in the stirring device;

[0172] Step S205, adding the sieved carbon fiber and reinforcing fiber into a stirring device;

[0173] Step S206, continue to heat up the stirring device and stir thoroughly for 30 minutes;

[0174] Step S207, obtaining a reinforced base liquid after heat preservation;

[0175] Step S208, pouring the strengthening base liquid into the extruder to extrude the strengthening filaments;

[0176] Step S209: braiding the extruded reinforcing filaments to obtain a reinforced inner layer.

[0177] Reinforcement fibers include glass fibers, silicon carbide whiskers, stainless steel fibers, and ultra-high molecular weight polyethylene fibers.

[0178] The mass ratio of glass fiber, silicon carbide whisker, stainless steel fiber and ultra-high molecular weight polyethylene fiber is 1:1:1:1.

[0179] The thickness ratio of carbon fiber prepreg to the reinforcing inner layer is 4:1.

[0180] The curing oven temperature is 110-130°C and the curing time is 90 minutes.

[0181] In step S202, when the crushed carbon fiber and reinforcing fiber are screened, the mesh number of the screen is 20 meshes.

[0182] Comparative Example 1:

[0183] A high-strength carbon fiber tube preparation process comprises the following steps:

[0184] Step S1, preparing carbon fiber prepreg;

[0185] Step S2, coating a release agent on the metal core rod;

[0186] Step S3, rolling the carbon fiber prepreg on a metal core rod coated with a release agent to obtain a carbon fiber base tube;

[0187] Step S4, wrapping a wrapping film on the carbon fiber base tube;

[0188] Step S5, placing the carbon fiber base tube wrapped with the winding film into an oven for curing;

[0189] Step S6, taking out the cured carbon fiber base tube, and removing the surface wrapping film to obtain a carbon fiber tube.

[0190] The mass components of the carbon fiber prepreg in step S1 are: 40 parts of modified resin, 55 parts of carbon fiber, and 8 parts of reinforcing agent;

[0191] The preparation steps of carbon fiber prepreg include:

[0192] Step S101, taking the modified resin and adding it into a stirring device for high-speed crushing and stirring;

[0193] Step S102, heating the stirring device, adding the reinforcing agent into the stirring device, and stirring again for 30 minutes to obtain a modified adhesive solution;

[0194] Step S103, applying the glue prepared in step S102 on the release paper;

[0195] Step S104, placing the release paper coated with glue between the pressure rollers;

[0196] Step S105, performing surface treatment on the carbon fiber;

[0197] Step S106, passing the treated carbon fiber through a pressing roller;

[0198] Step S107, the pressing roller is heated up, and the carbon fiber is slowly passed through the pressing roller, pressed and cooled to obtain the carbon fiber prepreg.

[0199] The modified resin in step S101 includes a high-performance resin and a bio-based resin.

[0200] In step S105, when the carbon fiber is subjected to surface treatment, plasma treatment and ultraviolet treatment are included;

[0201] During plasma treatment, the carbon fiber is fed into a plasma treatment chamber, and the plasma in the plasma treatment chamber impacts the surface of the carbon fiber, increasing the surface roughness of the carbon fiber.

[0202] The mass ratio of glass fiber, silicon carbide whisker, stainless steel fiber and ultra-high molecular weight polyethylene fiber is 1:1:1:1.

[0203] The thickness ratio of carbon fiber prepreg to the reinforcing inner layer is 4:1.

[0204] The curing oven temperature is 110-130°C and the curing time is 90 minutes.

[0205] Comparative Example 2:

[0206] A high-strength carbon fiber tube preparation process comprises the following steps:

[0207] Step S1, preparing carbon fiber prepreg;

[0208] Step S2, preparing a reinforced inner layer;

[0209] Step S3, laying the prepared reinforcing inner layer on the carbon fiber prepreg to obtain a carbon fiber base layer;

[0210] Step S4, coating a release agent on the metal core rod;

[0211] Step S5, rolling the carbon fiber base layer onto a metal core rod coated with a release agent to obtain a carbon fiber base tube;

[0212] Step S6, wrapping a wrapping film on the carbon fiber base tube;

[0213] Step S7, placing the carbon fiber base tube wrapped with the winding film into an oven for curing;

[0214] Step S8, taking out the cured carbon fiber base tube, and removing the surface wrapping film to obtain a carbon fiber tube.

[0215] The mass components of the carbon fiber prepreg in step S1 are: 40 parts of modified resin, 55 parts of carbon fiber, and 8 parts of reinforcing agent;

[0216] The preparation steps of carbon fiber prepreg include:

[0217] Step S101, taking the modified resin and adding it into a stirring device for high-speed crushing and stirring;

[0218] Step S102, heating the stirring device, adding the reinforcing agent into the stirring device, and stirring again for 30 minutes to obtain a modified adhesive solution;

[0219] Step S103, applying the glue prepared in step S102 on the release paper;

[0220] Step S104, placing the release paper coated with glue between the pressure rollers;

[0221] Step S105, performing surface treatment on the carbon fiber;

[0222] Step S106, passing the treated carbon fiber through a pressing roller;

[0223] Step S107, the pressing roller is heated up, and the carbon fiber is slowly passed through the pressing roller, pressed and cooled to obtain the carbon fiber prepreg.

[0224] The modified resin in step S101 includes a high-performance resin and a bio-based resin.

[0225] In step S105, when the carbon fiber is subjected to surface treatment, plasma treatment and ultraviolet treatment are included;

[0226] During plasma treatment, the carbon fiber is fed into a plasma treatment chamber, and the plasma in the plasma treatment chamber impacts the surface of the carbon fiber, increasing the surface roughness of the carbon fiber.

[0227] The mass composition of the reinforced inner layer in step S2 is: 55 parts of reinforcing resin and 45 parts of reinforcing fiber;

[0228] The steps for preparing the reinforced inner layer include:

[0229] Step S201, taking the reinforcing fiber and putting it into a grinder for grinding;

[0230] Step S202, sieving the crushed reinforcement fibers;

[0231] Step S203, pouring the reinforced resin into a stirring device for high-speed crushing and stirring;

[0232] Step S204, heating the stirring device to melt the crushed resin in the stirring device;

[0233] Step S205, adding the screened reinforcing fibers into a stirring device;

[0234] Step S206, continue to heat up the stirring device and stir thoroughly for 30 minutes;

[0235] Step S207, obtaining a reinforced base liquid after heat preservation;

[0236] Step S208, pouring the strengthening base liquid into the extruder to extrude the strengthening filaments;

[0237] Step S209: braiding the extruded reinforcing filaments to obtain a reinforced inner layer.

[0238] Reinforcement fibers include glass fibers, silicon carbide whiskers, stainless steel fibers, and ultra-high molecular weight polyethylene fibers.

[0239] The mass ratio of glass fiber, silicon carbide whisker, stainless steel fiber and ultra-high molecular weight polyethylene fiber is 1:1:1:1.

[0240] The thickness ratio of carbon fiber prepreg to the reinforcing inner layer is 4:1.

[0241] The curing oven temperature is 110-130°C and the curing time is 90 minutes.

[0242] In step S202, when the crushed reinforcing fibers are screened, the mesh number of the screen is 20 meshes.

[0243] The carbon fiber tubes prepared in Examples 1-3 and the tubes prepared in Comparative Examples 1-2 were subjected to performance tests, and the test contents and test methods are as follows:

[0244] Bending strength test: five groups of carbon fiber tubes are placed on a bending machine to detect the maximum bending angle of the tubes;

[0245] Shear strength test: five groups of carbon fiber tubes are placed on a shearing machine to test the maximum shear force of the tubes;

[0246] Tensile strength test: five groups of carbon fiber tubes are placed on a tensile machine for maximum tensile force testing;

[0247] Wear resistance test: Five groups of carbon fiber tubes were placed on a grinding machine to test the wear resistance of the side walls of the tubes;

[0248] Corrosion resistance test: Five groups of carbon fiber tubes were placed in an acid solution for corrosion resistance strength testing;

[0249] It should be noted that when conducting the corrosion resistance test, the acid solution is dilute hydrochloric acid with a concentration of 5%; the above test data are statistically recorded, and the specific data are shown in Table 1:

[0250]

[0251]

[0252] Table 1

[0253] The heat resistance test of the carbon fiber tubes prepared in Examples 1 to 3 was performed, and the test steps were as follows:

[0254] Three groups of carbon fiber tubes were placed in a high temperature furnace for heating test, and the test data were recorded during the heating process. The test data are shown in Table 2:

[0255]

[0256] Table 2

[0257] With reference to Examples 1-3 and Tables 1 and 2, the present invention can significantly improve the overall strength, wear resistance and corrosion resistance of the carbon fiber tube by using a combination of a carbon fiber prepreg and a reinforced inner layer when preparing the carbon fiber tube. At the same time, a reinforcing layer is added to the carbon fiber prepreg and the reinforced inner layer, which can effectively enhance the local strength of the carbon fiber tube on the one hand, and enhance the heat resistance of the carbon fiber tube on the other hand, so that it can be suitable for different use environments.

[0258] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A process for preparing a high-strength carbon fiber tube, characterized in that: The following steps are involved: Step S1, preparing carbon fiber prepreg; Step S2, preparing a reinforced inner layer; Step S3, preparing a reinforcement layer; Step S4, evenly laying the prepared reinforcement layer on the carbon fiber prepreg, and then laying the prepared reinforcement inner layer on the reinforcement layer to obtain a carbon fiber base layer; Step S5, coating a release agent on the metal core rod; Step S6, rolling the carbon fiber base layer onto a metal core rod coated with a release agent to obtain a carbon fiber base tube; Step S7, wrapping a wrapping film on the carbon fiber base tube; Step S8, placing the carbon fiber base tube wrapped with the winding film into an oven for curing; Step S9, taking out the cured carbon fiber base tube, and removing the surface wrapping film to obtain a carbon fiber tube; In step S3, the reinforcing layers are provided in multiple groups, and the multiple groups of reinforcing layers are evenly laid on the carbon fiber prepreg, and the spacing between two adjacent groups of reinforcing layers is 10-20 cm; The mass components of the reinforcing layer are: 50-60 parts of carbon fiber cloth, 30-40 parts of epoxy resin emulsion, and 5-10 parts of reinforcing agent; The preparation steps of the reinforcement layer include: Step S301, treating the surface of the carbon fiber cloth; Step S302, adding a reinforcing agent into the epoxy resin emulsion, and fully heating and stirring for 20-30 minutes to obtain a reinforcing base liquid; Step S303, evenly applying the mixed reinforcing base liquid on the treated carbon fiber cloth; Step S304, placing the carbon fiber cloth coated with the reinforcing base liquid in a dark place to dry in the shade; Step S305: Use a cutting machine to cut the fully air-dried carbon fiber cloth into reinforcement layers of the same size.

2. A process for preparing a high-strength carbon fiber tube according to claim 1, characterized in that: The mass components of the carbon fiber prepreg in step S1 are: 35-45 parts of modified resin, 50-60 parts of carbon fiber, and 5-10 parts of reinforcing agent; The preparation steps of the carbon fiber prepreg include: Step S101, taking the modified resin and adding it into a stirring device for high-speed crushing and stirring; Step S102, heating the stirring device, adding the reinforcing agent into the stirring device, and stirring again for 30 minutes to obtain a modified adhesive solution; Step S103, applying the glue prepared in step S102 on the release paper; Step S104, placing the release paper coated with glue between the pressure rollers; Step S105, performing surface treatment on the carbon fiber; Step S106, passing the treated carbon fiber through a pressing roller; Step S107, the pressing roller is heated up, and the carbon fiber is slowly passed through the pressing roller, pressed and cooled to obtain the carbon fiber prepreg.

3. A process for preparing a high-strength carbon fiber tube according to claim 2, characterized in that: The modified resin in step S101 includes high-performance resin and bio-based resin.

4. A process for preparing a high-strength carbon fiber tube according to claim 2, characterized in that: The surface treatment of the carbon fiber in step S105 includes plasma treatment and ultraviolet treatment; During the plasma treatment, the carbon fibers are fed into a plasma treatment chamber, and the plasma in the plasma treatment chamber impacts the surface of the carbon fibers to increase the surface roughness of the carbon fibers.

5. A process for preparing a high-strength carbon fiber tube according to claim 1, characterized in that: The mass components of the reinforced inner layer in step S2 are: 30-35 parts of reinforcing resin, 30-35 parts of carbon fiber, and 30-35 parts of reinforcing fiber; The steps of preparing the reinforced inner layer include: Step S201, putting carbon fiber and reinforcing fiber into a grinder for grinding; Step S202, sieving the crushed carbon fiber and reinforcing fiber; Step S203, pouring the reinforced resin into a stirring device for high-speed crushing and stirring; Step S204, heating the stirring device to melt the crushed resin in the stirring device; Step S205, adding the sieved carbon fiber and reinforcing fiber into a stirring device; Step S206, continue to heat up the stirring device and stir thoroughly for 30 minutes; Step S207, obtaining a reinforced base liquid after heat preservation; Step S208, pouring the strengthening base liquid into the extruder to extrude the strengthening filaments; Step S209: braiding the extruded reinforcing filaments to obtain a reinforced inner layer.

6. A process for preparing a high-strength carbon fiber tube according to claim 5, characterized in that: The reinforcing fibers include glass fibers, silicon carbide whiskers, stainless steel fibers and ultra-high molecular weight polyethylene fibers.

7. A process for preparing a high-strength carbon fiber tube according to claim 6, characterized in that: The mass ratio of the glass fiber, the silicon carbide whisker, the stainless steel fiber and the ultra-high molecular weight polyethylene fiber is 1:1:1:

1.

8. A process for preparing a high-strength carbon fiber tube according to claim 1, characterized in that: The thickness ratio of the carbon fiber prepreg to the reinforcing inner layer is 4:

1.

9. A process for preparing a high-strength carbon fiber tube according to claim 1, characterized in that: The curing furnace temperature is 110-130° C., and the curing time is 80-100 minutes.

10. A process for preparing a high-strength carbon fiber tube according to claim 5, characterized in that: In the step S202, when the crushed carbon fiber and reinforcing fiber are screened, the mesh number of the screen is 10-30 meshes.

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