A suspension for the preparation of carbon fiber reinforced thermoplastic resin matrix composites

Abstract

The application provides a suspension for preparing a carbon fiber reinforced thermoplastic resin matrix composite material, and belongs to the field of carbon fiber composite materials.In the application, the suspension is prepared by proportioning a carbon fiber surface modifier, nanoparticles and a non-ionic surfactant; the desized carbon fiber and the thermoplastic resin fiber are put into the prepared suspension; the suspension realizes the surface modification of the carbon fiber, and provides a dispersed environment for the carbon fiber and the resin fiber; a relative paddle stirring device is arranged in the suspension box to make the resin fiber and the carbon fiber uniformly mixed under the action of turbulence; meanwhile, an ultrasonic vibration device is arranged to assist the uniform dispersion of the fibers, and a uniform slurry is obtained; and therefore, the composite material with good tensile property, bending property, impact property, antistatic property, good interface compatibility and uniform distribution of the reinforcing fiber and the resin matrix can be further prepared.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of carbon fiber composite materials, and particularly relates to a suspension for preparing a carbon fiber reinforced thermoplastic resin matrix composite material. BACKGROUND

[0002] Carbon fiber modified reinforced composite material is a new type of material with light weight and high strength, and has good properties such as corrosion resistance and excellent mechanical properties. In recent years, the manufacturing of carbon fiber composite materials has provided harder and lighter alternatives to traditional metal parts. In the automotive industry, carbon fiber reinforced composite materials are increasingly widely used.

[0003] At present, the fiber reinforced composite material has the defect that the reinforcing fibers are not uniformly distributed in the resin matrix, which greatly affects the performance of the material. The traditional fiber reinforced resin material also has the defects of complex process and high price. Taking the traditional carbon fiber reinforced resin as an example, its preparation method includes: 1) carbon fiber felt forming; 2) resin impregnation into prepreg; 3) hot pressing of prepreg. The high price limits the large-scale application of fiber reinforced resin materials.

[0004] In view of the defects of the current carbon fiber reinforced thermoplastic composite material, such as uneven distribution of reinforcing fibers in the resin matrix and poor interfacial bonding between reinforcing fibers and resin, a suspension blending method is proposed to realize uniform blending of carbon fibers and resin fibers with large density difference, and to prepare a carbon fiber reinforced thermoplastic resin matrix composite material with low cost and high performance. However, due to the density difference, carbon fibers and resin fibers cannot be well dispersed in the existing modifier solution, which cannot meet the requirements of suspension blending. SUMMARY

[0005] In order to overcome the above-mentioned defects, the purpose of the present application is to provide a suspension for preparing a carbon fiber reinforced thermoplastic resin matrix composite material, which adopts the following technical scheme:

[0006] A suspension for preparing a carbon fiber reinforced thermoplastic resin matrix composite material, which is composed of 1-5wt% of a modifier solution, and 0.1-0.3% of nanoparticles, 0.1-0.15% of Triton X-100 and 1.0-1.5% of PEG-100000 in terms of the mass of the solution; the solvent of the modifier solution is a 95wt% ethanol water mixed solvent.

[0007] Preferably, the nanoparticles are one or a combination of carbon nanotubes, nanosilica and graphene oxide.

[0008] Preferably, the modifier is one or a combination of KH550, KH560, KH570, N-methyl pyrrolidone and maleic anhydride.

[0009] Preferably, the concentration of the modifier solution is 3 wt%.

[0010] Preferably, the nanoparticles account for 0.2% of the solution mass, Triton X-100 accounts for 0.125% of the solution mass, and / or PEG-100000 accounts for 1.25% of the solution mass.

[0011] The preparation method of the suspension for preparing the carbon fiber reinforced thermoplastic resin matrix composite material comprises the following steps:

[0012] 1) A mixed solvent is prepared according to a mass ratio of ethanol to deionized water of 95:5, a modifier is dissolved in the mixed solvent, mechanical stirring and ultrasonic device auxiliary treatment are performed for 30 min, and the concentration of the modifier is 1-5 wt%;

[0013] 2) Nanoparticles accounting for 0.1-0.3% of the solution mass, Triton X-100 accounting for 0.1-0.15% of the solution mass, and PEG-100000 accounting for 1.0-1.5% of the solution mass are added, mechanical stirring and ultrasonic device auxiliary treatment are performed for 30-60 min, and a stable suspension is obtained.

[0014] Advantages of the present application:

[0015] 1) The suspension for preparing the carbon fiber reinforced thermoplastic resin matrix composite material can provide a dispersed environment for carbon fibers and thermoplastic resin fibers with different densities, a relative paddle stirring device is arranged in the suspension box to uniformly mix the resin fibers and the carbon fibers under the action of turbulent flow, and an ultrasonic vibration device is additionally arranged to uniformly disperse the fibers, so that the problem that the two materials cannot be uniformly mixed in a common modifier solution due to different densities is solved, the concentration of the slurry prepared from the suspension is uniform, and the carbon fiber reinforced thermoplastic resin matrix composite material prepared has good tensile performance, bending performance, impact performance, antistatic property, and good interfacial compatibility, and the reinforcing fibers and the resin matrix are uniformly distributed.

[0016] 2) The suspension can disperse the carbon fibers and the thermoplastic resin fibers and simultaneously modify the surface of the carbon fibers.

[0017] 3) The suspension can be recycled after filtration. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a suspension blending method for preparing a carbon fiber reinforced thermoplastic resin matrix felt material and a composite material preparation method

[0019] 1 - carbon fiber; 2 - stirrer; 3 - desizing agent; 4 - drying oven; 5 - square mesh; 6 - resin fiber; 7 - desized carbon fiber; 8 - paddle; 9 - suspension blending tank; 10 - ultrasonic device; 11 - mold; 12 - filter; 13 - filtrate collection device; 14 - needle punching; 15 - drying oven; 16 - hot molding DETAILED DESCRIPTION

[0020] The application will be further described in conjunction with the following examples, but the embodiments of the application are not limited thereto. The reagents and materials used in the following examples are commercially available products unless otherwise specified.

[0021] Example 1 (20 wt% carbon fiber, 72 wt% polyether ether ketone fiber, 8 wt% ultra-high molecular weight polyethylene fiber)

[0022] Step a: carbon fiber desizing: prepare a mixed solvent of acetone and ethanol in a volume ratio of 1:1, put the carbon fiber into the solution and stir with a propeller stirrer for 30 min, wash with a low concentration sodium hydroxide solution (generally 0.4 wt%), take out the carbon fiber tows and put them into a drying oven, set the drying temperature to 120°C, and dry for 30 min to obtain desized carbon fiber.

[0023] Step b: suspension preparation: prepare a mixed solvent of ethanol and deionized water in a mass ratio of 95:5, dissolve KH560 in the mixed solvent to a concentration of 3 wt%, use relative paddle stirring and ultrasonic device to assist dispersion for 30 min, then add 0.2% carbon nanotubes, 0.125% Triton X-100 and 1.25% PEG-100000 by mass of the mixed solution, and use relative paddle stirring and ultrasonic device to assist dispersion for another 30 min.

[0024] Step c: mixing of carbon fiber reinforced fiber in suspension: according to the fiber density, first put 100.8 g of polyether ether ketone fiber with the smallest density into 14000 g of suspension, then put 28 g of carbon fiber and 11.2 g of ultra-high molecular weight polyethylene fiber into the suspension, and mix the fibers uniformly by forming turbulent flow through two groups of relative paddle stirring and ultrasonic device assistance, and process for 30 min to obtain a slurry.

[0025] Step d: filtration, drying and molding: use a fixed container to take out the slurry and put it into a filter to obtain a thin carbon fiber reinforced thermoplastic resin-based felt, and each layer of thin carbon fiber reinforced thermoplastic resin-based felt has a thickness of 5 mm, then take five layers of thin carbon fiber reinforced thermoplastic resin-based felt and stack them together, put them into a drying oven at 120°C for 10 min, and then use a needle punching machine to needle punch to obtain a carbon fiber reinforced thermoplastic resin-based felt;

[0026] The carbon fiber reinforced thermoplastic resin based felt material is then placed into a molding machine for hot pressing, wherein the molding temperature is 395°C, and the hot pressing time is 3 minutes, to obtain a carbon fiber reinforced thermoplastic resin based composite material.

[0027] Example 2 (40wt% carbon fiber, 54wt% polyether ether ketone, 6wt% ultra-high molecular weight polyethylene fiber).

[0028] Step a: carbon fiber desizing: Step a: prepare a mixed solvent of acetone and ethanol in a volume ratio of 1:1, place the carbon fiber into the solution and stir with a propeller stirrer for 30 minutes, wash with a low concentration sodium hydroxide solution, take out the carbon fiber tows and place them into a drying oven, set the drying temperature to 150°C, and dry for 30 minutes to obtain desized carbon fiber.

[0029] Step b: suspension preparation: prepare a mixed solvent of ethanol and deionized water in a mass ratio of 95:5, dissolve KH560 in the mixed solvent to a concentration of 3wt%, use a relative blade propeller stirring and ultrasonic device to assist dispersion for 30 minutes, then add 0.2% carbon nanotubes, 0.125% Triton X-100 and 1.25% PEG-100000 by mass of the mixed solution, and use a relative blade propeller stirring and ultrasonic device to assist dispersion for another 30 minutes.

[0030] Step c: mixing of carbon fiber reinforced fibers in the suspension: first place 83.16g of polyether ether ketone fibers into 14000g of the suspension, then place 75.6g of carbon fiber and 9.24g of ultra-high molecular weight polyethylene fiber into the suspension, and use two groups of relative blade propeller stirring to form turbulence and ultrasonic device to assist uniform mixing of the fibers, process for 30 minutes to obtain a slurry.

[0031] Step d: filtration, drying and molding: use a fixed container to take out the slurry and place it into a filter to obtain a thin carbon fiber reinforced thermoplastic resin based felt material, each layer of the thin carbon fiber reinforced thermoplastic resin based felt material has a thickness of 3mm, then stack seven layers of the felt material together, place them into a drying oven at 120°C for 10 minutes, and then use a needle punching machine to needle punch to obtain a carbon fiber reinforced thermoplastic resin based felt material.

[0032] The carbon fiber reinforced thermoplastic resin based felt material is then placed into a molding machine for hot pressing, wherein the molding temperature is 395°C, and the hot pressing time is 3 minutes, to obtain a carbon fiber reinforced thermoplastic resin based composite material.

[0033] Example 3 (50wt% carbon fiber, 44wt% polyether ether ketone, 6wt% ultra-high molecular weight polyethylene)

[0034] Step a: carbon fiber desizing: step a: take acetone and ethanol to prepare mixed solvent according to the volume ratio of 1:1, put the carbon fiber into the solution and use propeller stirrer, stir for 30 min, wash with low concentration sodium hydroxide solution, take out the carbon fiber bundle and put it into the drying oven, set the drying temperature to 200℃; drying time is 20 min, get desized carbon fiber.

[0035] Step b: suspension preparation: prepare mixed solvent according to the mass ratio of ethanol and deionized water 95:5, dissolve KH560 in the mixed solvent, the concentration is 3wt%. Use relative blade paddle agitation and ultrasonic device to assist dispersion for 30 min, then add 0.2% carbon nanotubes, 0.125% Triton X-100 and 1.25% PEG-100000 in the mixed solution, and then use relative blade paddle agitation and ultrasonic device to assist dispersion for 30 min.

[0036] Step c: mixing of carbon fiber reinforced fiber in suspension: first put 55.44g polyether ether ketone fiber into 14000g suspension, then put 63.0g carbon fiber and 7.56g ultrahigh molecular weight polyethylene into the suspension, and mix the fibers uniformly by forming turbulent flow through two groups of relative blade paddle agitation and ultrasonic device, process for 30 min, obtain slurry.

[0037] Step d: filtration, drying and molding: use fixed container to take out the slurry and put it into the filter, get a thin carbon fiber reinforced thermoplastic resin based felt material, the thickness of each thin carbon fiber reinforced thermoplastic resin based felt material is 4mm, then take six thin carbon fiber reinforced thermoplastic resin based felt materials and stack them together, put them into the drying oven and dry at 120℃ for 10 min, then use needle punching machine to needle punch, get carbon fiber reinforced thermoplastic resin based felt material;

[0038] Then put the carbon fiber reinforced thermoplastic resin based felt material into the molding press and hot press to form, the forming temperature is 395℃, the hot pressing time is 3min, get carbon fiber reinforced thermoplastic resin based composite material.

[0039] The steps adopted in the present application include desizing and modification treatment of carbon fiber, preparation of suspension, preparation of carbon fiber reinforced thermoplastic resin based felt material by suspension blending method, hot pressing to obtain carbon fiber reinforced thermoplastic resin based composite material.

[0040] The suspension is prepared by mixing carbon fiber surface modifier, nanoparticles and non-ionic surfactant in proportion, the desized carbon fiber and resin fiber are put into the prepared suspension, the resin fiber and carbon fiber are mixed uniformly under the action of turbulence by stirring with relative paddle in the suspension box, the dispersion of the fiber is assisted by ultrasonic vibration device, the pulp in the suspension is taken out by a container and put into a filter, the thin carbon fiber reinforced thermoplastic resin based felt material is obtained after filtering the solution, the thin carbon fiber reinforced thermoplastic resin based felt material is stacked layer by layer to obtain a certain thickness, after drying, needling is carried out, the carbon fiber reinforced thermoplastic resin based felt material is obtained, and the carbon fiber reinforced thermoplastic resin based composite material is obtained by hot pressing.

[0041] Effect verification

[0042] Table 1 is the performance test data of the carbon fiber reinforced thermoplastic resin based composite material prepared in examples 1-3.

[0043] Examples Thickness (mm) Tensile strength (MPa) Flexural strength (MPa) Impact strength (KJ / m 2 ) Water absorption (%) Resistivity (x 10 6 Ω*cm) 1 2.1 573 125.6 106.6 0.03 1000 2 2.0 689 182.5 112.4 0.02 10 3 2.1 521 210.9 104.56 0.04 0.3

[0044] As shown in Table 1, the carbon fiber reinforced thermoplastic resin based composite material prepared by using the suspension provided by the present application has good tensile property, bending property, impact property, antistatic property, good interface compatibility and uniform distribution of reinforcing fiber and resin matrix.

Claims

1. A slurry for preparing carbon fiber reinforced thermoplastic resin-based composite materials, characterized in that, The slurry is obtained by dispersing carbon fiber and thermoplastic resin fiber in a suspension. The suspension tank is equipped with a relative impeller to agitate the thermoplastic resin fiber and carbon fiber under turbulent flow, and is also equipped with an ultrasonic vibration device to assist in the uniform dispersion of the fibers. The suspension consists of 1-5 wt% modifier solution, 0.1-0.3% nanoparticles, 0.1-0.15% Triton X-100, and 1.0-1.5% PEG-100000, accounting for 0.1-0.3% of the total mass of the suspension. The solvent of the modifier solution is a 95 wt% ethanol-water mixture. The nanoparticles are one or a combination of several of carbon nanotubes, nano-silica, and graphene oxide. The modifier is one or a combination of several of KH550, KH560, KH570, N-methylpyrrolidone, and maleic anhydride.

2. The slurry for preparing carbon fiber reinforced thermoplastic resin matrix composites according to claim 1, characterized in that, The concentration of the modifier solution is 3 wt%.

3. The slurry for preparing carbon fiber reinforced thermoplastic resin-based composite materials according to claim 1, characterized in that, The nanoparticles account for 0.2% of the total mass of the suspension, Triton X-100 accounts for 0.125% of the total mass of the suspension, and / or PEG-100000 accounts for 1.25% of the total mass of the suspension.

4. The slurry for preparing carbon fiber reinforced thermoplastic resin-based composite materials according to claim 1, wherein the method for preparing the suspension is characterized in that, The steps of this method are as follows: 1) Prepare a mixed solvent with ethanol and deionized water at a mass ratio of 95:

5. Dissolve the modifier in the mixed solvent and treat with mechanical stirring and ultrasonic equipment for 30 minutes. The concentration of the modifier is 1-5 wt%. 2) Add 0.1-0.3% nanoparticles, 0.1-0.15% Triton X-100 and 1.0-1.5% PEG-100000 by the total mass of the suspension, and treat with mechanical stirring and ultrasonic device for 30-60 minutes to obtain a stable suspension.

Images