ABS (Acrylonitrile Butadiene Styrene) plastic part with multi-walled carbon nanotube conductive liquid and preparation method thereof

Abstract

The invention discloses an ABS plastic part with multi-walled carbon nanotube conductive liquid and a preparation method of the ABS plastic part, and relates to the technical field of materials. The preparation method provided by the invention comprises the following steps: mixing a multi-walled carbon nanotube, a dispersing agent and a first solvent to obtain multi-walled carbon nanotube slurry; at least mixing the multi-walled carbon nanotube slurry, polyurethane resin and a second solvent to obtain a multi-walled carbon nanotube conductive liquid; isopropanol and a third solvent are mixed, then the multi-walled carbon nanotube conductive liquid is added for mixing, after standing and defoaming, the surface of ABS plastic is coated with the mixture, and after drying, an ABS plastic part body is obtained; and electroplating metal on the surface of the ABS plastic part body to obtain the ABS plastic part with the multi-walled carbon nanotube conductive liquid. According to the preparation method, the ABS plastic part is directly coated to form the conductive film, and then the metal is electroplated, so that the electroplating process steps are effectively simplified, the preparation method is simple and easy to implement, the cost is relatively low, and the conductive film can be well combined with the ABS plastic part and has relatively good performance.

Description

Technical Field

[0001] This application belongs to the field of materials technology, specifically relating to an ABS plastic part with a multi-walled carbon nanotube conductive liquid and its preparation method. Background Technology

[0002] Acrylonitrile-butadiene-styrene copolymer (ABS) plastic is widely used in electronic products, automotive products and daily necessities due to its excellent mechanical properties, heat resistance, chemical corrosion resistance, easy processing and molding, and high coating adhesion due to easy surface erosion.

[0003] ABS plastic itself is not conductive, so it needs to be electroplated to make it conductive before it can be used as an electroplated ABS plastic part. However, due to the characteristics of ABS plastic, the current process for manufacturing electroplated ABS plastic parts with coatings is relatively complicated, the performance stability of the finished products is not ideal, and the cost is also relatively high. Summary of the Invention

[0004] The purpose of this application is to overcome the above-mentioned shortcomings of the prior art and provide an ABS plastic part with multi-walled carbon nanotube conductive liquid and its preparation method, so as to solve the problems that the existing electroplated ABS plastic parts with coating are relatively complicated, the performance stability of the products is not ideal, and the cost is relatively high.

[0005] To achieve the aforementioned objectives, a first aspect of this application provides a method for preparing an ABS plastic part with a multi-walled carbon nanotube conductive liquid, comprising:

[0006] Multi-walled carbon nanotubes, a dispersant and a first solvent are mixed to obtain a multi-walled carbon nanotube slurry; then, at least the multi-walled carbon nanotube slurry, a polyurethane resin and a second solvent are mixed to obtain a multi-walled carbon nanotube conductive liquid.

[0007] Isopropanol and a third solvent are mixed, and then the multi-walled carbon nanotube conductive liquid is added and mixed. After standing to defoam, the mixture is coated onto the surface of ABS plastic and dried to obtain the ABS plastic part body.

[0008] Metal is electroplated onto the surface of the ABS plastic part body to obtain an ABS plastic part with a multi-walled carbon nanotube conductive liquid.

[0009] Furthermore, the solid content of the multi-walled carbon nanotube conductive liquid is 2-3%;

[0010] And / or, the thickness of the conductive film formed by the multi-walled carbon nanotube conductive liquid is 8-12 μm.

[0011] Further, the process of mixing multi-walled carbon nanotubes, a dispersant, and a first solvent to obtain a multi-walled carbon nanotube slurry includes:

[0012] The multi-walled carbon nanotubes, polyvinylpyrrolidone, and water are mixed by sand milling to obtain the multi-walled carbon nanotube slurry; wherein the sand milling speed is 2000-2400 rpm and the sand milling time is 4-6 h.

[0013] Furthermore, the mass percentage of the multi-walled carbon nanotubes in the multi-walled carbon nanotube slurry is the same as the mass percentage of the dispersant in the multi-walled carbon nanotube slurry;

[0014] And / or, the solid content of the multi-walled carbon nanotube slurry is 3-5%;

[0015] And / or, the maximum particle size of the multi-walled carbon nanotube slurry is less than 5 μm;

[0016] And / or, the fineness of the multi-walled carbon nanotubes is less than 10 μm;

[0017] And / or, the multi-walled carbon nanotubes include long carbon nanotubes and short carbon nanotubes, wherein the mass ratio of the long carbon nanotubes to the short carbon nanotubes is 1:3-6, the aspect ratio of the long carbon nanotubes is 10000-50000:1, and the aspect ratio of the short carbon nanotubes is 2000-8000:1.

[0018] Further, the step of mixing at least the multi-walled carbon nanotube slurry, polyurethane resin, and a second solvent to obtain the multi-walled carbon nanotube conductive liquid includes:

[0019] The multi-walled carbon nanotube slurry is added to a high-speed disperser, and then a first polyurethane resin and a second polyurethane resin are added and mixed. Water is then added to obtain the multi-walled carbon nanotube conductive liquid.

[0020] Alternatively, the multi-walled carbon nanotube slurry and the metal conductive powder are added to a high-speed disperser, and then a first polyurethane resin and a second polyurethane resin are added and mixed. Water is then added to obtain the multi-walled carbon nanotube conductive liquid. The high-speed disperser rotates at 1600-2000 rpm and the mixing time is 1-4 hours.

[0021] Furthermore, the ratio of the total weight of the multi-walled carbon nanotube slurry to the first polyurethane resin and the second polyurethane resin is 13-16:1;

[0022] And / or, the mass ratio of the first polyurethane resin to the second polyurethane resin is 4-6:1, the first polyurethane resin includes isocyanate and hydroxyl groups, the molar ratio of the isocyanate to the hydroxyl groups is 1-2:0.8-1, the elongation of the first polyurethane resin is 300-500%, the hydroxyl value of the first polyurethane resin is 80-120 mgKOH / g, the solid content of the first polyurethane resin is 30-50%, and the second polyurethane resin is a modified polyurethane polyester copolymer resin, the solid content of the second polyurethane resin is 25-45%.

[0023] Further, the second polyurethane resin is prepared via the following steps:

[0024] Toluene dicyanate was placed under a protective atmosphere, polyethylene glycol was added, and the mixture was reacted at 70-90°C for a period of time. Then the temperature was lowered to below 40°C to obtain a polyurethane prepolymer.

[0025] Polyester is added to the polyurethane prepolymer, then a chain extender is added, and the mixture is reacted at 70-90°C for a period of time. The temperature is then lowered to below 30°C to obtain the second polyurethane resin.

[0026] Furthermore, when the multi-walled carbon nanotube slurry and the metal conductive powder are added to a high-speed disperser, the polyurethane resin is added and mixed, and then the second solvent is added to obtain the multi-walled carbon nanotube conductive liquid, the metal conductive powder includes silver powder or copper powder.

[0027] And / or, the mass ratio of the conductive metal powder to the multi-walled carbon nanotube slurry is 1:3-10.

[0028] Furthermore, the volume ratio of the isopropanol to the third solvent is 1:1;

[0029] And / or, the settling and defoaming time is 1-3 hours;

[0030] And / or, the drying temperature is 70-90℃, and the drying time is 1-3 hours;

[0031] And / or, the thickness of the conductive film formed by the multi-walled carbon nanotube conductive liquid is 8-12 μm;

[0032] And / or, the electroplating solution includes a copper sulfate solution, and the electroplating current density is 2-4 A / dm³. 2 The electroplating time is 20-40 minutes, and the electroplating temperature is 20-30℃.

[0033] And / or, the thickness of the metal coating formed by electroplating is 4-6 μm.

[0034] A second aspect of this application provides an ABS plastic part having a multi-walled carbon nanotube conductive liquid, including the ABS plastic part having a multi-walled carbon nanotube conductive liquid prepared by the above-mentioned method for preparing ABS plastic parts having a multi-walled carbon nanotube conductive liquid.

[0035] Compared with the prior art, this application has the following technical effects:

[0036] The ABS plastic parts with multi-walled carbon nanotube conductive liquid and their preparation method provided in this application involve coating the multi-walled carbon nanotube conductive liquid onto the surface of ABS plastic and drying it to form a conductive film. This results in good uniformity and stability of the conductive network in the conductive film. The ABS plastic part itself possesses good conductivity, and the conductive liquid bonds well with the ABS plastic to form a uniform and stable conductive film. Further electroplating on the surface of this conductive film allows for direct formation of a metal coating, eliminating the need for the current cumbersome steps of first plating palladium or silver (i.e., gold spraying) onto the ABS plastic surface and then plating the corresponding coating. This simplifies the electroplating process, making it easy to implement and cost-effective. Furthermore, it ensures that the metal coating has good corrosion resistance, durability, and wear resistance, making it less prone to peeling and guaranteeing the stability of the metal coating quality. This also improves the performance of the ABS plastic parts with multi-walled carbon nanotube conductive liquid and enhances their stability, which is beneficial for large-scale industrial production and application. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0038] Figure 1 This is a process flow diagram of the preparation of conductive liquid for electroplating ABS plastic provided in the embodiments of this application;

[0039] Figure 2 This is a process flow diagram of another conductive liquid preparation process for ABS plastic electroplating provided in the embodiments of this application;

[0040] Figure 3 This is a process flow diagram of another conductive liquid for electroplating ABS plastic provided in the embodiments of this application;

[0041] Figure 4 This is a process flow diagram of another conductive liquid for electroplating ABS plastic provided in the embodiments of this application;

[0042] Figure 5 This is a process flow diagram of the preparation of an ABS plastic part with a multi-walled carbon nanotube conductive liquid provided in the embodiments of this application;

[0043] Figure 6 This is a process flow diagram of another ABS plastic part with multi-walled carbon nanotube conductive liquid provided in the embodiments of this application;

[0044] Figure 7 This is a process flow diagram of another ABS plastic part with multi-walled carbon nanotube conductive liquid provided in the embodiments of this application. Detailed Implementation

[0045] To make the technical problems, technical solutions, and beneficial effects of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0046] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In this application, "at least one" means one or more, and "multiple" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.

[0048] It should be understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0049] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0050] The weights of the relevant components mentioned in the embodiments of this application can refer not only to the specific content of each component, but also to the proportional relationship between the weights of the components. Therefore, any scaling up or down of the content of the relevant components according to the embodiments of this application is within the scope disclosed in the embodiments of this application. Specifically, the mass in the embodiments of this application can be a known unit of mass such as μg, mg, g, or kg.

[0051] The terms "first," "second," etc., are used for descriptive purposes only to distinguish objects, such as substances, from one another, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. For example, without departing from the scope of the embodiments of this application, "first XX" may also be referred to as "second XX," and similarly, "second XX" may also be referred to as "first XX." Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0052] ABS resin is a copolymer composed of three monomers: acrylonitrile (A), butadiene (B), and styrene (S). The B component maintains an extremely fine spherical structure in the polymer, making it easily soluble during the roughening process. This allows for the roughening of the surface of ABS plastics, which are primarily made of ABS resin, and the achievement of good adhesion. Therefore, the electroplating suitability of ABS plastics varies depending on the B component content. Currently, "electroplated grade" ABS plastics are selected for electroplating; "electroplated grade" refers to ABS plastics containing 15-25 wt% B component.

[0053] By electroplating metal or other coatings onto the surface of ABS plastic, coated ABS plastic parts can be manufactured. Currently, coated ABS plastic parts are generally prepared as follows: First, the ABS plastic is pretreated; then, palladium or silver is electroplated onto the surface of the pretreated ABS plastic part, mainly to make the ABS plastic conductive; finally, other coatings are formed on the surface of the metal coating to achieve the coated ABS plastic part.

[0054] It is evident that the manufacturing process of commonly used coated ABS plastic parts is relatively complicated, and the performance stability of the coated ABS plastic parts is not ideal. At the same time, the cost is relatively high, which is not conducive to industrial production and application.

[0055] Carbon nanotubes, due to their excellent electrical conductivity, have been explored for improving the processing and performance of electroplated ABS plastic parts with coatings. However, existing carbon nanotube slurries exhibit poor bonding performance with ABS plastic, leading to easy coating peeling. Furthermore, the dispersion stability of carbon nanotube slurries is insufficient, easily resulting in carbon nanotube aggregation, which affects the uniformity and stability of the conductive network, causing unstable coating quality.

[0056] Based on the above, the first aspect is, as Figure 1 As shown in the embodiments of this application, a method for preparing a conductive liquid from multi-walled carbon nanotubes is provided, comprising the following steps:

[0057] S1. Mix multi-walled carbon nanotubes, dispersant and first solvent to obtain multi-walled carbon nanotube slurry.

[0058] S2. At least the multi-walled carbon nanotube slurry, polyurethane resin, and second solvent are mixed to obtain a multi-walled carbon nanotube conductive liquid.

[0059] The method for preparing multi-walled carbon nanotube conductive liquid provided in this application involves at least the preparation of the conductive liquid using multi-walled carbon nanotube slurry and polyurethane resin. The conductive liquid exhibits good dispersion of multi-walled carbon nanotubes, minimizing agglomeration and resulting in a uniform and stable conductive network. This method is simple and easy to implement. Furthermore, the conductive liquid is coated onto the surface of ABS plastic. The conductive liquid bonds well with the ABS plastic, forming a uniform and stable conductive film. This not only imparts excellent conductivity to the ABS plastic but also prevents the subsequent metal plating layer formed on the conductive film from easily peeling off. Compared to existing methods such as palladium or silver plating, this method is simpler, lower in cost, and beneficial for large-scale industrial production and application.

[0060] [S1]

[0061] The above step S1 can be as follows: Figure 2 As shown, the specific steps may include the following:

[0062] S11. Mix multi-walled carbon nanotubes, dispersant and first solvent in a sand mill to obtain multi-walled carbon nanotube slurry.

[0063] The solid content of the multi-walled carbon nanotube slurry can be 3-5%. For example, the solid content of the multi-walled carbon nanotube slurry can be 3%, 3.6%, 4%, 4.5%, or 5%, etc. This allows the multi-walled carbon nanotubes to be uniformly dispersed in the slurry, preventing them from agglomerating.

[0064] The multi-walled carbon nanotubes can include long carbon nanotubes and short carbon nanotubes, and the mass ratio of long carbon nanotubes to short carbon nanotubes can be 1:3-6. For example, the mass ratio of long carbon nanotubes to short carbon nanotubes can be 1:3, 1:4, 1:5 or 1:6, etc.

[0065] The aspect ratio of the aforementioned long carbon nanotubes can be 10,000-50,000:1. For example, the aspect ratio of the long carbon nanotubes can be 10,000:1, 20,000:1, 30,000:1, 40,000:1, or 50,000:1, etc.

[0066] The aspect ratio of the aforementioned short carbon nanotubes can be 2000-8000:1. For example, the aspect ratio of the short carbon nanotubes can be 2000:1, 3000:1, 4000:1, 5000:1, 6000:1, 7000:1, or 8000:1, etc.

[0067] In applications, dispersants can be polyvinyl pyrrolidone (PVP), etc. The pyrrolidone ring in PVP is adsorbed π-π conjugatedly onto the surface of multi-walled carbon nanotubes to form a coating layer, which reduces the surface energy and inhibits the aggregation of multi-walled carbon nanotubes. This can effectively improve the dispersion efficiency of multi-walled carbon nanotubes in water, reduce the sedimentation rate of multi-walled carbon nanotubes, and extend the storage period of the conductive liquid.

[0068] The mass ratio of multi-walled carbon nanotubes to PVP can be 1:1. As an example, the mass of multi-walled carbon nanotubes is 128g, the mass of PVP is 128g, and the mass of the first solvent is 6885g. Experimental and theoretical analyses show that a 1:1 mass ratio of multi-walled carbon nanotubes (MWC nanotubes) to polyvinyl chloride (PVP) represents the optimal balance point for overall performance. Firstly, PVP is sufficient to completely coat the surface of MWC nanotubes, forming single-layer or multi-layer adsorption, allowing for uniform dispersion of MWC nanotubes in the slurry. This prevents MWC nanotube aggregation and ensures dispersion stability. Secondly, it guarantees efficient construction of the conductive network. At a 1:1 ratio, PVP prevents MWC nanotube aggregation without excessively hindering contact. MWC nanotubes form continuous conductive pathways through point-to-surface or line-to-line connections, significantly reducing the percolation threshold. Furthermore, at a 1:1 ratio, PVP has a moderate total solids content, and the system viscosity is controlled between 50-200 mPa·s (25℃), making it suitable for slot coating or microgravure coating processes. This ensures the uniformity of the conductive film (thickness deviation less than 5%), and PVP is relatively inexpensive.

[0069] In applications, the first solvent can be water, etc. Further, the first solvent can be deionized water, etc. Thus, multi-walled carbon nanotubes can dissolve well in water and, through the dispersion effect of PVP, are uniformly dispersed in the multi-walled carbon nanotube slurry, making them less prone to aggregation. Furthermore, water can adjust the solid content of the multi-walled carbon nanotube slurry.

[0070] In applications, multi-walled carbon nanotubes (MWCNTs) have a large specific surface area and surface energy, making them prone to agglomeration. Therefore, sand milling is used to break up these agglomerated MWCNTs through the interaction of the grinding media with the MWCNTs and dispersants. This allows the dispersant to be better adsorbed onto the surface of the MWCNTs, thereby improving the uniformity of MWCNT dispersion in the media. Simultaneously, sand milling can further reduce the length and diameter of MWCNTs, achieving a finer particle size distribution. Furthermore, sand milling can achieve uniform dispersion and particle size reduction of MWCNTs in a shorter time, making it more suitable for industrial production, thus improving production efficiency and reducing production costs. Therefore, the grinding speed of the sand mill can be set to 2000-2400 rpm, and the grinding time can be 4-6 hours. For example, the grinding speed can be 2000 rpm, 2100 rpm, 2200 rpm, 2300 rpm, or 2400 rpm, and the grinding time can be 4 hours, 4.5 hours, 5 hours, 5.5 hours, or 6 hours, etc. This results in a better grinding effect.

[0071] Milling can reduce the maximum particle size (Dmax) of multi-walled carbon nanotubes to less than 5 μm. For example, Dmax can be 1 μm, 2 μm, 3 μm, 4.2 μm, 4.5 μm, or 4.9 μm. Smaller particle size increases the specific surface area of ​​multi-walled carbon nanotubes, increasing their contact area with other substances, thus enabling them to perform better in applications.

[0072] Milling can reduce the fineness of multi-walled carbon nanotubes to less than 10 μm. For example, the fineness of multi-walled carbon nanotubes can be 1 μm, 2 μm, 4 μm, 6 μm, 8 μm, or 9 μm. This allows the multi-walled carbon nanotubes to be uniformly dispersed in the multi-walled carbon nanotube slurry, preventing agglomeration.

[0073] [S2]

[0074] The above step S2 is as follows Figure 3 As shown, the specific steps may include the following:

[0075] S21. Add the multi-walled carbon nanotube slurry to a high-speed disperser, then add polyurethane resin, and continue stirring to mix evenly. Then add a second solvent for dilution to obtain a multi-walled carbon nanotube conductive liquid.

[0076] Polyurethane resin possesses excellent flexibility and adhesion. Its soft segments (e.g., polyether / polyester chains) impart elasticity to the conductive liquid. Conductive films prepared using this conductive liquid exhibit a resistance change of less than 5% after 100,000 bends. Furthermore, the isocyanate groups in the polyurethane resin can bond with ABS plastic, enabling the conductive film to adhere stably to the ABS plastic surface. Moreover, polyurethane resin enhances the film-forming properties of the conductive liquid; its low surface tension promotes uniform spreading and reduces pinhole defects. Specifically, the polyurethane resin may include a first polyurethane resin and a second polyurethane resin, with a mass ratio of 4-6:1. For example, the mass ratio of the first polyurethane resin to the second polyurethane resin may be 4:1, 5:1, or 6:1, etc.

[0077] The first polyurethane resin comprises isocyanate and hydroxyl groups. For example, the molar ratio of isocyanate to hydroxyl groups can be 1-2:0.8-1. The polyurethane resin contains more isocyanate than hydroxyl groups. The hydroxyl groups preferentially react with isocyanate to form a prepolymer containing terminal isocyanate groups. The remaining isocyanate groups in the prepolymer can further react with water (moisture curing), chain extenders, or hydroxyl compounds to form a three-dimensional cross-linked network, enhancing the filler-resin interfacial bonding force and reducing the risk of conductive network breakage due to stress.

[0078] The elongation of the first polyurethane resin can be 300-500%, for example, it can be 300%, 350%, 400%, 450%, or 500%. High elongation allows the first polyurethane resin to possess excellent elastic deformation capabilities, ensuring that the conductive film does not crack when repeatedly rolled (bent more than 100,000 times), and the resistance change rate is less than 5%. The flexible segments (e.g., polyether soft segments) in the first polyurethane resin can absorb mechanical stress, preventing the multi-walled carbon nanotube network from breaking due to external forces and maintaining the integrity of the conductive pathway.

[0079] The hydroxyl value of the first polyurethane resin can be 80-120 mgKOH / g. For example, the hydroxyl value of the first polyurethane resin can be 80 mgKOH / g, 90 mgKOH / g, 100 mgKOH / g, 110 mgKOH / g, or 120 mgKOH / g. The hydroxyl value determines the content of active hydroxyl groups (-OH) in the first polyurethane resin, which directly affects the degree of reaction with the curing agent (e.g., isocyanate). This allows for the control of the crosslinking density of the first polyurethane resin, resulting in a soft conductive film with enhanced chemical resistance. Simultaneously, an appropriate amount of hydroxyl groups forms hydrogen bonds with oxygen-containing groups (e.g., -COOH) on the surface of multi-walled carbon nanotubes, enhancing the filler-resin interfacial bonding force (peel strength greater than 1.5 N / mm). Therefore, a hydroxyl value of 80-120 mgKOH / g for the first polyurethane resin achieves an optimal balance between flexibility (elongation) and hardness (abrasion resistance), avoiding extreme performance in any single area.

[0080] The second polyurethane resin can be a modified polyurethane-polyester copolymer resin, obtained by copolymerizing polyurethane and polyester. Specifically, it is produced by chemically reacting a polyurethane prepolymer containing isocyanate groups with a polyester polyol containing hydroxyl groups. The preparation method of the second polyurethane resin includes the following steps:

[0081] (1) After selecting toluene dicyanate and polyethylene glycol in a certain weight ratio, polyethylene glycol is added while stirring under nitrogen (N2) atmosphere. The reaction is carried out at 70-90℃ for 3-4 hours, and then the temperature is lowered to below 40℃ to obtain polyurethane prepolymer. It should be noted that the polyurethane prepolymer contains isocyanate groups.

[0082] (2). After selecting polyurethane prepolymer and polyester in a certain weight ratio, the polyurethane prepolymer and polyester are mixed evenly under nitrogen (N2) conditions, and then a chain extender is added. After reacting at 70-90℃ for 2-3 hours, the temperature is lowered to below 30℃ to obtain modified polyurethane polyester copolymer resin (i.e. modified polyurethane epoxy resin).

[0083] In the modified polyurethane polyester copolymer resin, epoxy resin accounts for 70-90 parts, toluene dicyanate accounts for 100-200 parts, polyethylene glycol accounts for 50-100 parts, and chain extender accounts for 1-3 parts.

[0084] The aforementioned chain extenders can be, for example, trimethylolpropane. Chain extenders can react with the active groups at the chain ends of polyurethane prepolymers or polyester polyols, connecting short-chain molecules and allowing the molecular chains to extend continuously, thereby increasing the molecular weight of the resin and regulating its molecular structure, thus improving the resin's performance.

[0085] By compounding the first polyurethane resin and the second polyurethane resin, the conductive liquid of multi-walled carbon nanotubes can be subsequently dried into a conductive film, which improves its film-forming properties, adhesion to ABS plastic, smoothness, and hardness.

[0086] The solid content of the first polyurethane resin can be 30-50%, and the solid content of the second polyurethane resin can be 25-45%. For example, the solid content of the first polyurethane resin can be 30%, 35%, 40%, 45%, or 50%, and the solid content of the second polyurethane resin can be 25%, 30%, 35%, 40%, or 45%. Maintaining the solid content of the polyurethane resin within these ranges reduces transportation and storage volume, lowers the risk of microbial growth (in aqueous systems), and improves storage stability. When using, dilute as needed (e.g., 1:10-1:15 with water) to precisely control the solid content of the multi-walled carbon nanotube conductive liquid (2-3%), ensuring batch consistency.

[0087] In applications, the weight ratio of multi-walled carbon nanotube slurry to polyurethane resin can be 13-16:1. For example, the weight ratio of multi-walled carbon nanotube slurry to polyurethane resin can be 13:1, 14:1, 15:1, or 16:1, etc.

[0088] In applications, the second solvent can be water, or more specifically, deionized water. Adding water for dilution adjusts the solid content of the multi-walled carbon nanotube conductive liquid, allowing it to reach 2-3%. For example, the solid content can be 2%, 2.3%, 2.5%, 2.7%, 2.9%, or 3%. A suitable solid content allows the multi-walled carbon nanotubes to form a continuous conductive network, ensuring moderate viscosity suitable for slot coating or microgravure coating, resulting in an ultrathin and uniform conductive film.

[0089] In the application, a high-speed disperser is used for mixing. The speed of the high-speed disperser can be 1600-2000 rpm, and the mixing time can be 1-4 hours. For example, the speed of the high-speed disperser can be 1600 rpm, 1700 rpm, 1800 rpm, 1900 rpm, or 2000 rpm, and the mixing time can be 1 hour, 2 hours, 3 hours, or 4 hours.

[0090] The above step S2 is as follows Figure 4 As shown, the specific steps may include the following:

[0091] S22. Add multi-walled carbon nanotube slurry and metal conductive powder to a high-speed disperser, then add polyurethane resin, and continue stirring to mix evenly. Then add a second solvent for dilution to obtain multi-walled carbon nanotube conductive liquid.

[0092] In applications, conductive metal powders can be silver powder, copper powder, etc.

[0093] The mass ratio of the aforementioned conductive metal powder to the multi-walled carbon nanotube slurry can be 1:3-10. For example, the mass ratio of the conductive metal powder to the multi-walled carbon nanotube slurry can be 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, or 1:10, etc.

[0094] It should be noted that the multi-walled carbon nanotube slurry, polyurethane resin, second solvent and high-speed disperser in step S22 can be referred to step S21, and will not be repeated here.

[0095] Secondly, embodiments of this application provide a method for preparing an ABS plastic part with a multi-walled carbon nanotube conductive liquid.

[0096] like Figure 5As shown in the embodiments of this application, the method for preparing ABS plastic parts with multi-walled carbon nanotube conductive liquid may include the following steps:

[0097] S3. After mixing a certain amount of isopropanol and a third solvent, add multi-walled carbon nanotube conductive liquid and mix. After standing to defoam, coat the mixture onto the surface of ABS plastic and dry it to obtain the ABS plastic part body.

[0098] S4. Electroplating metal onto the surface of the ABS plastic part to obtain an ABS plastic part with a multi-walled carbon nanotube conductive liquid.

[0099] It should be noted that the conductive liquid made from multi-walled carbon nanotubes can be referenced in the above embodiments, and will not be repeated here.

[0100] The method for preparing ABS plastic parts with multi-walled carbon nanotube conductive liquid provided in this application involves coating the multi-walled carbon nanotube conductive liquid onto the surface of ABS plastic and drying it to form a multi-walled carbon nanotube conductive film. This results in good uniformity and stability of the conductive network in the multi-walled carbon nanotube conductive film. In other words, the resulting ABS plastic part body possesses good conductivity, and the conductive liquid bonds well with the ABS plastic to form a uniform and stable multi-walled carbon nanotube conductive film. Further electroplating on the surface of this highly conductive multi-walled carbon nanotube conductive film allows for direct electroplating to form a metal coating. This eliminates the need for the current cumbersome steps of first plating palladium or silver (i.e., gold spraying) onto the ABS plastic surface and then plating the corresponding coating, effectively simplifying the electroplating process. This method is simple to implement and has low cost. Furthermore, it ensures that the metal coating has good corrosion resistance, durability, and wear resistance, making it less prone to peeling off and guaranteeing the stability of the metal coating quality. This also improves the performance of the ABS plastic parts with multi-walled carbon nanotube conductive liquid and makes the stability of the ABS plastic parts with multi-walled carbon nanotube conductive liquid ideal, which is beneficial for large-scale industrial production and application.

[0101] [S3]

[0102] The above step S3 is as follows Figure 6 As shown, the specific steps may include the following:

[0103] S31. After mixing isopropanol and the third solvent at a volume ratio of 1:1, add multi-walled carbon nanotube conductive liquid and stir continuously until uniform. After standing to defoam, coat the mixture onto the surface of ABS plastic and then dry it to obtain the ABS plastic part body.

[0104] It should be noted that the conductive liquid made from multi-walled carbon nanotubes can be referenced in the above embodiments, and will not be repeated here.

[0105] In applications, 10 wt% isopropanol and 10 wt% water of the multi-walled carbon nanotube conductive liquid can be added.

[0106] The third solvent mentioned above can be acetone, etc.

[0107] The above-mentioned settling and defoaming time can be 1-3 hours. For example, the settling and defoaming time can be 1 hour, 1.5 hours, 2 hours, 2.5 hours, or 3 hours, etc.

[0108] A mixture of multi-walled carbon nanotube conductive liquid, isopropanol, and a third solvent can be uniformly coated onto the surface of ABS plastic by spraying.

[0109] The drying temperature can be 70-90℃, and the drying time can be 1-3 hours. For example, the drying temperature can be 70℃, 75℃, 80℃, 85℃ or 90℃, and the drying time can be 1 hour, 1.5 hours, 2 hours, 2.5 hours or 3 hours.

[0110] After drying, the thickness of the multi-walled carbon nanotube conductive film formed by the resulting conductive liquid can be 8-12 μm. For example, the thickness of the multi-walled carbon nanotube conductive film can be 8 μm, 9 μm, 10 μm, 11 μm, or 12 μm. A suitable thickness of the multi-walled carbon nanotube conductive film not only adapts to ABS plastic and subsequent metal coatings, but also, through synergistic optimization of materials, processes, and structures, can significantly reduce costs, improve reliability, and promote green manufacturing.

[0111] [S4]

[0112] The above step S4 is as follows Figure 7 As shown, the specific steps may include the following:

[0113] S41. After electroplating the ABS plastic part in the electroplating solution of the electroplating tank for a period of time, it is cleaned and dried in sequence to obtain an ABS plastic part with multi-walled carbon nanotube conductive liquid.

[0114] In applications, the electroplating solution can be copper sulfate solution, etc.

[0115] Electroplating current density can be 2-4 A / dm 2 The electroplating time can be 20-40 minutes, and the electroplating temperature can be 20-30℃. For example, the electroplating current density can be 2 A / dm³. 2 2.5A / dm 2 3A / dm 2 3.5A / dm 2 Or 4A / dm 2The electroplating time can be 20 min, 30 min or 40 min, etc., and the electroplating temperature can be 20℃, 25℃ or 30℃, etc.

[0116] After electroplating for a period of time, it can be rinsed in clean water and dried at 70-90℃ for 0.5-2 hours to form an ABS plastic part with a conductive liquid containing multi-walled carbon nanotubes. For example, the drying temperature can be 70℃, 80℃, or 90℃, and the drying time can be 0.5h, 1h, or 2h.

[0117] This allows for the production of a metal coating with a thickness of 4-6 μm, which is firmly bonded to the ABS plastic part and is not easily detached.

[0118] Further, step S41 above, which involves immersing the ABS plastic part in the electroplating solution of the electroplating tank for a period of time, followed by sequential cleaning and drying to obtain an ABS plastic part with multi-walled carbon nanotube conductive liquid, may include:

[0119] S411. Perform pretreatment on the surface of the ABS plastic part.

[0120] Specifically, step S411 above, which involves pre-treating the surface of the ABS plastic part, can be performed as follows:

[0121] (1). The surface of the ABS plastic part is degreased to obtain a degreased ABS plastic part.

[0122] The degreasing process can be carried out according to the following steps:

[0123] The ABS plastic part is placed in an alkaline degreasing solution for a period of time to remove oil, then cleaned and dried to obtain a degreased ABS plastic part.

[0124] In applications, alkaline degreasing solutions can be aqueous solutions containing 80 g / L NaOH and 15 g / L Na2CO3.

[0125] The degreasing temperature can be 45-55℃, and the degreasing time can be 35-45 minutes. For example, the degreasing temperature can be 45℃, 50℃, or 55℃, and the degreasing time can be 35 minutes, 40 minutes, or 45 minutes.

[0126] The surface can be rinsed with a large amount of deionized water and dried with cold air to obtain a degreased ABS plastic part body.

[0127] The above-mentioned degreasing treatment can remove dirt and grease from the surface of ABS plastic parts.

[0128] (2). The surface of the degreased ABS plastic part is roughened to obtain a roughened ABS plastic part.

[0129] The roughening process can be carried out according to the following steps:

[0130] The degreased ABS plastic part body is placed in a roughening solution for a period of time to roughen it. After etching to form a microstructure on the surface of the ABS plastic part body, it is cleaned and dried to obtain the roughened ABS plastic part body body.

[0131] In applications, the roughening solution can be an aqueous solution containing 1 g / L K2Cr2O7 and 500 mL / L H2SO4 (98%).

[0132] The roughening temperature can be 66-70℃, and the roughening time can be 35-45 minutes. For example, the roughening temperature can be 66℃, 68℃, or 70℃, and the roughening time can be 35 minutes, 40 minutes, or 45 minutes. This process etches microstructures onto the surface of the degreased ABS plastic part, then rinses the surface with a large amount of deionized water and dries it with cold air to obtain the roughened ABS plastic part.

[0133] It should be noted that the degree of roughening can be controlled as needed. For example, the richer the microstructure formed by etching on the surface of the degreased ABS plastic part, the stronger the bond between the subsequent metal plating layer and the ABS plastic, and the better the adhesion.

[0134] The roughening treatment described above can change the surface morphology of the ABS plastic part, for example, forming microstructures such as micropores on its surface. This is because the B component on the surface of the ABS plastic maintains an extremely fine spherical rubber structure in the polymer, which is easily corroded away to form countless micropores, thereby making the surface of the ABS plastic part hydrophilic, improving the roughness of the ABS plastic part surface, and obtaining good bonding force.

[0135] It should be noted that the A and S components in ABS are basically unaffected during the roughening process.

[0136] (3) Sensitize the roughened ABS plastic part body surface to obtain a sensitized ABS plastic part body.

[0137] The sensitization process can be performed according to the following steps:

[0138] The roughened ABS plastic part body is placed in a room temperature sensitizing solution for a period of time, then washed and dried to obtain the sensitized ABS plastic part body.

[0139] The sensitizing solution can be an aqueous solution containing 20 g / L SnCl2 and 50 mg / L HCl.

[0140] The sensitization time at room temperature can be 10-20 minutes. The surface is then rinsed thoroughly with plenty of deionized water and dried in cool air to obtain the sensitized ABS plastic part. For example, the sensitization time at room temperature can be 10 minutes, 15 minutes, or 20 minutes.

[0141] The aforementioned sensitization treatment can clean and modify the roughened surface of the ABS plastic part, thereby enhancing the bonding strength between the metal coating and the ABS plastic part in subsequent processes, and improving the efficiency and quality of metal coating formation in subsequent processes.

[0142] S412. The surface of the pretreated ABS plastic part is sequentially subjected to copper plating, nickel plating and chromium plating to obtain an ABS plastic part with multi-walled carbon nanotube conductive liquid.

[0143] After the above copper plating, nickel plating and chromium plating treatments, copper, nickel and chromium layers can be sequentially stacked on the surface of the pretreated ABS plastic part to form a sandwich composite metal coating.

[0144] Among them, copper plating can enhance the gloss, smoothness and softness of the surface of the pre-treated ABS plastic parts; nickel plating can improve the decorative and wear-resistant properties of the pre-treated ABS plastic parts; and chromium plating can improve the gloss, corrosion resistance and metallic feel of the pre-treated ABS plastic parts.

[0145] It should be noted that, firstly, due to the coefficient of thermal expansion of ABS (e.g., 90 × 10⁻⁶), -6 / K) is much higher than the coefficient of thermal expansion of copper (e.g., 16 × 10). -6 Therefore, during the heat treatment of copper electroplating, the pre-treated ABS plastic part body will deform more than the copper layer, resulting in poorer bonding between the pre-treated ABS plastic part body and the copper layer, which easily leads to copper layer peeling off. Therefore, in the embodiments of this application, before copper plating, chromic acid etching can be used to etch the surface of the pre-treated ABS plastic part body to adjust the thermal expansion coefficient of the pre-treated ABS plastic part body, thereby enhancing the bonding strength between its surface and the copper layer and reducing the risk of copper layer peeling off.

[0146] Secondly, the type, structure, and number of metal coatings formed on the surface of the pretreated ABS plastic parts can be selected and controlled according to actual needs, and no specific limitations are made here.

[0147] Thirdly, this embodiment provides an ABS plastic part with multi-walled carbon nanotube conductive liquid prepared by the above-described method for preparing ABS plastic parts with multi-walled carbon nanotube conductive liquid.

[0148] The ABS plastic parts with multi-walled carbon nanotube conductive liquid provided in this application have metal coatings with good conductivity, corrosion resistance, durability and wear resistance. They are not easy to peel off, ensuring the stability of the metal coating quality and improving the performance of ABS plastic parts with multi-walled carbon nanotube conductive liquid, resulting in good product quality. In addition, the preparation cost is low, and it is simple to implement, which is conducive to large-scale industrial production and application.

[0149] The following examples illustrate the preparation methods and applications of ABS plastic parts provided in the embodiments and comparative examples of this application.

[0150] I. Examples of ABS plastic parts with multi-walled carbon nanotube conductive liquid and their preparation methods as described in this application:

[0151] Example 1

[0152] 1. Preparation of conductive liquid using multi-walled carbon nanotubes:

[0153] (1) Mix 128g of multi-walled carbon nanotubes (32g of long carbon nanotubes and 96g of short carbon nanotubes, with the aspect ratio of the long carbon nanotubes being 10000:1 and the aspect ratio of the short carbon nanotubes being 2000:1), 128g of PVP and 6885g of deionized water in a sand mill at a sand mill speed of 2000rpm for 4h to obtain multi-walled carbon nanotube slurry.

[0154] The solid content of the multi-walled carbon nanotube slurry is 3%, the maximum particle size Dmax of the multi-walled carbon nanotubes is 1μm, and the fineness of the multi-walled carbon nanotubes is 1μm.

[0155] (2) Add the multi-walled carbon nanotube slurry to a high-speed disperser, then add the first polyurethane resin and the second polyurethane resin (the weight ratio of the multi-walled carbon nanotube slurry to the first polyurethane resin and the second polyurethane resin is 13:1, the mass ratio of the first polyurethane resin to the second polyurethane resin is 4:1, the solid content of the first polyurethane resin is 30%, and the solid content of the second polyurethane resin is 25%), stir continuously and mix at 1600 rpm for 1 hour, then add deionized water to dilute and obtain the multi-walled carbon nanotube conductive liquid.

[0156] The solid content of the multi-walled carbon nanotube conductive liquid is 2%.

[0157] 2. Preparation of ABS plastic parts with multi-walled carbon nanotube conductive liquid:

[0158] (1). Isopropanol and acetone are mixed evenly according to the amount of multi-walled carbon nanotube conductive liquid at a mass percentage of 10wt%. Then, multi-walled carbon nanotube conductive liquid is added and stirred evenly. After standing for 1 hour to remove foam, it is evenly sprayed on the surface of ABS plastic and then dried at 70℃ to obtain the ABS plastic part body.

[0159] The thickness of the conductive film is 8 μm.

[0160] (2). Place the ABS plastic part in a copper sulfate solution in an electroplating tank at 4A / dm³. 2 After electroplating at a current density of 20℃ for 20 minutes, the sample is rinsed in clean water and then dried at 70℃ for 0.5 hours to obtain an ABS plastic part with a conductive liquid containing multi-walled carbon nanotubes.

[0161] The thickness of the metal coating is 4 μm.

[0162] Example 2

[0163] 1. Preparation of conductive liquid using multi-walled carbon nanotubes:

[0164] (1) Mix 128g of multi-walled carbon nanotubes (32g of long carbon nanotubes and 96g of short carbon nanotubes, with the aspect ratio of the long carbon nanotubes being 10000:1 and the aspect ratio of the short carbon nanotubes being 2000:1), 128g of PVP and 6885g of deionized water in a sand mill at a sand mill speed of 2000rpm for 4h to obtain multi-walled carbon nanotube slurry.

[0165] The solid content of the multi-walled carbon nanotube slurry is 3%, the maximum particle size Dmax of the multi-walled carbon nanotubes is 1μm, and the fineness of the multi-walled carbon nanotubes is 1μm.

[0166] (2). Add multi-walled carbon nanotube slurry and silver powder to a high-speed disperser (the mass ratio of silver powder to multi-walled carbon nanotube slurry can be 1:3), then add the first polyurethane resin and the second polyurethane resin (the weight ratio of multi-walled carbon nanotube slurry to the first polyurethane resin and the second polyurethane resin is 13:1, the mass ratio of the first polyurethane resin to the second polyurethane resin is 4:1, the solid content of the first polyurethane resin is 30%, and the solid content of the second polyurethane resin is 25%), continue stirring and mix at 1600 rpm for 1 hour, then add deionized water to dilute and obtain multi-walled carbon nanotube conductive liquid.

[0167] The solid content of the multi-walled carbon nanotube conductive liquid is 2%.

[0168] 2. Preparation of ABS plastic parts with multi-walled carbon nanotube conductive liquid:

[0169] (1) Isopropanol and acetone were mixed evenly according to a mass percentage of 10 wt% of multi-walled carbon nanotube conductive liquid. Then, multi-walled carbon nanotube conductive liquid was added and stirred continuously until homogeneous. After standing for 1 hour to remove foam, the mixture was evenly sprayed onto the surface of ABS plastic and then dried at 70°C to obtain the ABS plastic part body.

[0170] The thickness of the conductive film is 8 μm.

[0171] (2). Place the ABS plastic part in a copper sulfate solution in an electroplating tank at 4A / dm³. 2 After electroplating at a current density of 20℃ for 20 minutes, the sample is rinsed in clean water and then dried at 70℃ for 0.5 hours to obtain an ABS plastic part with a conductive liquid containing multi-walled carbon nanotubes.

[0172] The thickness of the metal coating is 4 μm.

[0173] Example 3

[0174] 1. Preparation of conductive liquid using multi-walled carbon nanotubes:

[0175] (1) Mix 128g of multi-walled carbon nanotubes (32g of long carbon nanotubes and 96g of short carbon nanotubes, with the aspect ratio of the long carbon nanotubes being 10000:1 and the aspect ratio of the short carbon nanotubes being 2000:1), 128g of PVP and 6885g of deionized water in a sand mill at a sand mill speed of 2000rpm for 4h to obtain multi-walled carbon nanotube slurry.

[0176] The solid content of the multi-walled carbon nanotube slurry is 3%, the maximum particle size Dmax of the multi-walled carbon nanotubes is 1μm, and the fineness of the multi-walled carbon nanotubes is 1μm.

[0177] (2) Add the multi-walled carbon nanotube slurry to a high-speed disperser, then add the first polyurethane resin and the second polyurethane resin (the weight ratio of the multi-walled carbon nanotube slurry to the first polyurethane resin and the second polyurethane resin is 13:1, the mass ratio of the first polyurethane resin to the second polyurethane resin is 4:1, the solid content of the first polyurethane resin is 30%, and the solid content of the second polyurethane resin is 25%), stir continuously and mix at 1600 rpm for 1 hour, then add deionized water to dilute and obtain the multi-walled carbon nanotube conductive liquid.

[0178] The solid content of the multi-walled carbon nanotube conductive liquid is 2%.

[0179] 2. Preparation of ABS plastic parts with multi-walled carbon nanotube conductive liquid:

[0180] (1). Isopropanol and acetone are mixed evenly according to the amount of multi-walled carbon nanotube conductive liquid at a mass percentage of 10wt%. Then, multi-walled carbon nanotube conductive liquid is added and stirred evenly. After standing for 1 hour to remove foam, it is evenly sprayed on the surface of ABS plastic and then dried at 70℃ to obtain the ABS plastic part body.

[0181] The thickness of the conductive film is 8 μm.

[0182] (2). Place the ABS plastic part body in an alkaline degreasing solution containing 80g / L NaOH and 15g / L Na2CO3, degrease at 45℃ for 35min, rinse the surface with a large amount of deionized water, and dry it with cold air to obtain the degreased ABS plastic part body.

[0183] (3) The degreased ABS plastic part body is placed in a roughening solution containing 1 g / L K2Cr2O7 and 500 mL / L H2SO4 (98%) and roughened at 66°C for 35 min. After etching to form microstructures on the surface of the ABS plastic part body, the surface is rinsed with a large amount of deionized water and dried in cold air to obtain the roughened ABS plastic part body.

[0184] (4) The roughened ABS plastic part body is placed in a sensitizing solution containing 20 g / L SnCl2 and 50 mg / L HCl, and sensitized at room temperature for 10 min. The surface is rinsed with a large amount of deionized water and dried in the air with cold air to obtain the sensitized ABS plastic part body.

[0185] (5) Place the sensitized ABS plastic part in the electroplating solution of the electroplating tank, at 4A / dm 2 After being subjected to copper plating, nickel plating and chromium plating treatments at a current density of 20℃, the material was rinsed in clean water and then dried at 70℃ for 0.5h to obtain ABS plastic parts with multi-walled carbon nanotube conductive liquid.

[0186] The thickness of the metal coating is 4 μm.

[0187] II. Comparative Examples of ABS Plastic Parts with Metallic Coatings and Their Preparation Methods:

[0188] Comparative Example 1

[0189] (1) Pretreatment of ABS plastic.

[0190] (2) The surface of the pretreated ABS plastic parts is electroplated by palladium plating.

[0191] (3) Form other coatings on the surface of the metal coating to realize ABS plastic parts with coatings.

[0192] Comparative Example 2

[0193] (1) Pretreatment of ABS plastic.

[0194] (2) Electroplating is performed on the surface of the pretreated ABS plastic parts by silver plating.

[0195] (3) Form other coatings on the surface of the metal coating to realize ABS plastic parts with coatings.

[0196] The adhesion (cross-cut) test was performed on Examples 1-3 and Comparative Examples 1-2. The cross-cut test is a method for testing the adhesion of paint films. According to international standards, it can be divided into 6 levels, with units of 0B, 1B, 2B, 3B, 4B and 5B. The higher the level, the more stringent the requirements. For example, if it is 5B, it means that there should be no paint film peeling off.

[0197] It should be noted that the cross-cut adhesion test is designed and manufactured according to ISO2409-1992 standard and is applicable to GB / T9286-98, BS 3900E6 / ASTM D3359.

[0198] Table 1

[0199] project 100-square test results Example 1 5B Example 2 5B Example 3 5B Comparative Example 1 4B Comparative Example 2 4B

[0200] As can be seen from Table 1, the metal coatings formed by re-plating the multi-walled carbon nanotube conductive liquid used for electroplating ABS plastic in Examples 1-3 of this application have better quality and significantly lower cost compared with the coatings formed by electroplating palladium or silver on the surface of ABS plastic in Comparative Examples 1-2.

[0201] This section only introduces the content related to the invention point; the rest can be obtained by referring to relevant technologies, and will not be described in detail here.

[0202] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for preparing an ABS plastic part with a multi-walled carbon nanotube conductive liquid, characterized in that, include: Multi-walled carbon nanotubes, dispersant and first solvent are mixed to obtain multi-walled carbon nanotube slurry; Then, at least the multi-walled carbon nanotube slurry, polyurethane resin, and second solvent are mixed to obtain a multi-walled carbon nanotube conductive liquid. Isopropanol and a third solvent are mixed, and then the multi-walled carbon nanotube conductive liquid is added and mixed. After standing to defoam, the mixture is coated onto the surface of ABS plastic and dried to obtain the ABS plastic part body. Metal is electroplated onto the surface of the ABS plastic part body to obtain the ABS plastic part with multi-walled carbon nanotube conductive liquid.

2. The method for preparing ABS plastic parts with multi-walled carbon nanotube conductive liquid according to claim 1, characterized in that, The solid content of the multi-walled carbon nanotube conductive liquid is 2-3%. And / or, the thickness of the conductive film formed by the multi-walled carbon nanotube conductive liquid is 8-12 μm.

3. The method for preparing ABS plastic parts with multi-walled carbon nanotube conductive liquid according to claim 1 or 2, characterized in that, The process of mixing multi-walled carbon nanotubes, a dispersant, and a first solvent to obtain a multi-walled carbon nanotube slurry includes: The multi-walled carbon nanotubes, polyvinylpyrrolidone, and water are mixed by sand milling to obtain the multi-walled carbon nanotube slurry; wherein the sand milling speed is 2000-2400 rpm and the sand milling time is 4-6 h.

4. The method for preparing ABS plastic parts with multi-walled carbon nanotube conductive liquid according to claim 1 or 2, characterized in that, The mass percentage of the multi-walled carbon nanotubes in the multi-walled carbon nanotube slurry is the same as the mass percentage of the dispersant in the multi-walled carbon nanotube slurry. And / or, the solid content of the multi-walled carbon nanotube slurry is 3-5%; And / or, the maximum particle size of the multi-walled carbon nanotube slurry is less than 5 μm; And / or, the fineness of the multi-walled carbon nanotubes is less than 10 μm; And / or, the multi-walled carbon nanotubes include long carbon nanotubes and short carbon nanotubes, wherein the mass ratio of the long carbon nanotubes to the short carbon nanotubes is 1:3-6, the aspect ratio of the long carbon nanotubes is 10000-50000:1, and the aspect ratio of the short carbon nanotubes is 2000-8000:

1.

5. The method for preparing ABS plastic parts with multi-walled carbon nanotube conductive liquid according to claim 1 or 2, characterized in that, The step of mixing at least the multi-walled carbon nanotube slurry, polyurethane resin, and a second solvent to obtain the multi-walled carbon nanotube conductive liquid includes: The multi-walled carbon nanotube slurry is added to a high-speed disperser, and then a first polyurethane resin and a second polyurethane resin are added and mixed. Water is then added to obtain the multi-walled carbon nanotube conductive liquid. Alternatively, the multi-walled carbon nanotube slurry and the metal conductive powder are added to a high-speed disperser, and then a first polyurethane resin and a second polyurethane resin are added and mixed. Water is then added to obtain the multi-walled carbon nanotube conductive liquid. The high-speed disperser rotates at 1600-2000 rpm and the mixing time is 1-4 hours.

6. The method for preparing ABS plastic parts with multi-walled carbon nanotube conductive liquid according to claim 5, characterized in that, The ratio of the total weight of the multi-walled carbon nanotube slurry to the first polyurethane resin and the second polyurethane resin is 13-16:

1. And / or, the mass ratio of the first polyurethane resin to the second polyurethane resin is 4-6:1, the first polyurethane resin includes isocyanate and hydroxyl groups, the molar ratio of the isocyanate to the hydroxyl groups is 1-2:0.8-1, the elongation of the first polyurethane resin is 300-500%, the hydroxyl value of the first polyurethane resin is 80-120 mgKOH / g, the solid content of the first polyurethane resin is 30-50%, and the second polyurethane resin is a modified polyurethane polyester copolymer resin, the solid content of the second polyurethane resin is 25-45%.

7. The method for preparing ABS plastic parts with multi-walled carbon nanotube conductive liquid according to claim 6, characterized in that, The second polyurethane resin is obtained through the following steps: Toluene dicyanate was placed under a protective atmosphere, polyethylene glycol was added, and the mixture was reacted at 70-90°C for a period of time. Then the temperature was lowered to below 40°C to obtain a polyurethane prepolymer. Polyester is added to the polyurethane prepolymer, then a chain extender is added, and the mixture is reacted at 70-90°C for a period of time. The temperature is then lowered to below 30°C to obtain the second polyurethane resin.

8. The method for preparing ABS plastic parts with multi-walled carbon nanotube conductive liquid according to claim 5, characterized in that, In the case where the multi-walled carbon nanotube slurry and the metal conductive powder are added to a high-speed disperser, the polyurethane resin is added and mixed, and then the second solvent is added to obtain the multi-walled carbon nanotube conductive liquid, the metal conductive powder includes silver powder or copper powder. And / or, the mass ratio of the conductive metal powder to the multi-walled carbon nanotube slurry is 1:3-10.

9. The method for preparing ABS plastic parts with multi-walled carbon nanotube conductive liquid according to claim 1 or 2, characterized in that, The volume ratio of isopropanol to the third solvent is 1:1; And / or, the settling and defoaming time is 1-3 hours; And / or, the drying temperature is 70-90℃, and the drying time is 1-3 hours; And / or, the thickness of the conductive film formed by the multi-walled carbon nanotube conductive liquid is 8-12 μm; And / or, the electroplating solution includes a copper sulfate solution, and the electroplating current density is 2-4 A / dm³. 2 The electroplating time is 20-40 minutes, and the electroplating temperature is 20-30℃. And / or, the thickness of the metal coating formed by electroplating is 4-6 μm.

10. An ABS plastic part with a multi-walled carbon nanotube conductive liquid, characterized in that, The ABS plastic part with multi-walled carbon nanotube conductive liquid prepared by the method of preparing the ABS plastic part with multi-walled carbon nanotube conductive liquid as described in any one of claims 1 to 9.

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