Preparation, application and usage method of a polyurethane conductive additive

Abstract

This invention discloses a method for preparing, applying, and using a polyurethane conductive additive. The polyurethane conductive additive comprises carbon nanotubes and a dispersant carrier. The additive is prepared by grinding using a three-roll mill. The carbon nanotubes in the additive comprise 1-10 wt% of the total mass, and the dispersant carrier comprises 90-99 wt% of the total mass. The polyurethane conductive additive provided by this invention achieves an antistatic effect by uniformly mixing it with polyurethane in a high-speed disperser and then rolling it onto the ground or other substrates. Furthermore, polyurethane itself has good resistance to friction and anti-slip properties. Polyurethane with excellent antistatic properties can greatly improve safety in daily life and production, and expand its application areas.

Description

Technical Field

[0001] This invention relates to the field of antistatic resins, and more specifically to the preparation, application, and usage method of a polyurethane conductive additive. Background Technology

[0002] The preparation of antistatic polyurethane typically requires modifying the polyurethane formulation by adding conductive components to achieve antistatic effects. Existing antistatic polyurethanes often have complex compositions and demanding application conditions; excessive addition of conductive components often compromises the polyurethane's corrosion resistance and abrasion resistance. This invention uses carbon nanotubes as the main additive, and a mere 0.6% by mass achieves excellent antistatic performance. This doping component has almost no impact on the intrinsic physical properties of the polyurethane. This conductive additive effectively solves the problems of poor antistatic performance, poor mechanical properties, complex composition, and demanding application conditions inherent in traditional antistatic polyurethane materials.

[0003] For example, CN116144255A discloses an antistatic waterborne polyurethane mortar flooring material and its preparation method, belonging to the field of coating technology preparation. This antistatic waterborne polyurethane mortar flooring material comprises three components: the first component includes 60-70 parts of waterborne polyurethane, 10-25 parts of pure water, 10-25 parts of conductive mica powder, and 5-15 parts of color paste; the waterborne polyurethane resin is a hydroxyl-based waterborne polyol; the conductive mica powder is mica powder with a surface coated with titanium dioxide, tin dioxide, and antimony tetroxide; the second component includes 15-30 parts of waterborne isocyanate and 1-6 parts of additives; the waterborne isocyanate is a hydrophilically modified aliphatic isocyanate curing agent; the additives are one of waterborne defoamers, leveling agents, and rheology modifiers; the third component includes 5-15 parts of calcium hydroxide, 2-8 parts of quartz sand, 5-10 parts of 52.5 grade white cement, and 0.2-1 parts of carbon fiber.

[0004] For example, CN116333580A discloses an antistatic polyurethane coating and its preparation method, belonging to the field of coating technology. This antistatic polyurethane coating is composed of the following components in parts by weight: 20-25 parts epoxy-modified polyether polyol, 30-40 parts polyisocyanate monomer, 10-15 parts plasticizer, 10-20 parts conductive filler, 0.1-2 parts dispersant, 1-3 parts leveling agent, 0.1-2 parts defoamer, 10-15 parts curing agent, 0.5-1 part catalyst, and 50-60 parts diluent; wherein the conductive filler is composed of carbon nanofibers and anatase nano-titanium dioxide in a mass ratio of 3:1. The conductive filler in this invention's antistatic polyurethane coating, using carbon nanofibers and anatase nano-titanium dioxide, allows for a wide range of applications, including wood coatings, automotive repair coatings, anti-corrosion coatings, floor paints, electronic coatings, textile coatings, polyurethane waterproof coatings, etc.

[0005] However, the two patents above indicate that antistatic polyurethane still has the following main problems: its complex composition makes it unsuitable for large-scale application; in addition, current antistatic polyurethane materials are all integrally bundled, and conductive additives cannot be adapted to various types of polyurethane. Summary of the Invention

[0006] To overcome the aforementioned main problems, the present invention provides a conductive additive applicable to various types of polyurethane, which can significantly improve the antistatic properties of polyurethane.

[0007] The technical solution of the present invention is: a method for preparing a polyurethane conductive additive, which specifically includes the following steps:

[0008] S1) Weigh out the conductive carbon nanotubes and dispersant carrier according to the design ratio, and set aside;

[0009] S2) After the conductive carbon nanotubes and dispersant carrier weighed in S1) are mixed evenly, they are placed in a grinder at room temperature for staged grinding to obtain the polyurethane conductive additive.

[0010] Further, the polyurethane conductive additive in S1) is, by mass percentage: 1-10 wt% conductive host carbon nanotubes and 90-99 wt% dispersant carrier.

[0011] Furthermore, the specific process of the staged grinding in S2) is as follows:

[0012] The grinding process employs a three-roll mill.

[0013] First stage: Perform at least one grinding pass; the specific process during grinding is as follows: the distance between roller 1 and roller 2 is 30-100μm, the distance between roller 2 and roller 3 is 25-150μm; the rotation speed is 100-150r / min;

[0014] Second stage: Perform at least one grinding pass; the specific process during grinding is as follows: the distance between roller 1 and roller 2 is 5-30μm, the distance between roller 2 and roller 3 is 1-15μm; the rotation speed is 150-200r / min.

[0015] Furthermore, the conductive host carbon nanotubes in S1) include single-walled carbon nanotubes, multi-walled carbon nanotubes, and oligo-walled carbon nanotubes.

[0016] The dispersant carrier includes esters and ethers; the ester is diisononyl cyclohexanedicarboxylate or glycidyl tert-cholate;

[0017] The ether is dodecyl glycidyl ether, tetradecyl glycidyl ether, or fatty alcohol polyvinyl ether.

[0018] Furthermore, the three-roll mill is a hydraulic three-roll mill or a CNC three-roll mill.

[0019] The above-mentioned polyurethane conductive additive is used in wood coatings, anti-corrosion coatings, floor paints, electronic coatings, textile coatings, and polyurethane waterproof coatings.

[0020] Another object of the present invention is to provide a method for using the above-mentioned polyurethane conductive additive, the method specifically including the following steps:

[0021] First, weigh out 0.2-2% by mass of polyurethane conductive additive and 98-99.8% by mass of polyurethane prepolymer, and set aside for later use;

[0022] The weighed polyurethane conductive additive and polyurethane prepolymer are dispersed in a high-speed disperser using a composite method to obtain the antistatic polyurethane material.

[0023] Furthermore, the dispersion parameters are: the rotation speed of the high-speed disperser is 1500-3000 r / min; the dispersion time is 15-30 min.

[0024] Furthermore, the polyurethane prepolymer includes a single-component polyurethane prepolymer, a two-component polyurethane prepolymer, and a multi-component polyurethane prepolymer.

[0025] Furthermore, the coating thickness of the antistatic polyurethane material is 7-8 mil, and its sheet resistance is less than 10 Ω·cm. 9 ohms / sq.

[0026] The technical advantages of this invention are as follows: By adopting the above technical solution, this invention obtains a series of conductive additives for polyurethane containing carbon nanotubes that are well dispersed in polyurethane. In polyurethane, only 0.02–0.2% wt of this conductive additive is needed to achieve an antistatic effect, and at this dosage, it has almost no impact on the physicochemical properties of the polyurethane itself. Attached Figure Description

[0027] Figure 1 This is a flowchart illustrating a method for preparing a polyurethane conductive additive according to the present invention.

[0028] Figure 2 This is a resistivity bar diagram of Embodiments 1-5 of the present invention. Detailed Implementation

[0029] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0030] like Figure 1 As shown, the present invention discloses a method for preparing a polyurethane conductive additive, which specifically includes the following steps:

[0031] S1) Weigh out the conductive carbon nanotubes and dispersant carrier according to the design ratio, and set aside;

[0032] S2) After the conductive carbon nanotubes and dispersant carrier weighed in S1) are mixed evenly, they are placed in a grinder at room temperature for staged grinding to obtain the polyurethane conductive additive.

[0033] The polyurethane conductive additive in S1) is, by mass percentage: 1-10 wt% of conductive host carbon nanotubes and 90-99 wt% of dispersant carrier.

[0034] The specific process of the staged grinding in S2) is as follows:

[0035] The grinding process employs a three-roll mill.

[0036] First stage: Perform at least one grinding pass; the specific process during grinding is as follows: the distance between roller 1 and roller 2 is 30-100μm, the distance between roller 2 and roller 3 is 25-150μm; the rotation speed is 100-150r / min;

[0037] Second stage: Perform at least one grinding pass; the specific process during grinding is as follows: the distance between roller 1 and roller 2 is 5-30μm, the distance between roller 2 and roller 3 is 1-15μm; the rotation speed is 150-200r / min.

[0038] The conductive host carbon nanotubes in S1) include single-walled carbon nanotubes, multi-walled carbon nanotubes, and oligo-walled carbon nanotubes.

[0039] The dispersant carrier includes esters and ethers; the ester is diisononyl cyclohexanedicarboxylate or glycidyl tert-cholate;

[0040] The ether is dodecyl glycidyl ether, tetradecyl glycidyl ether, or fatty alcohol polyvinyl ether.

[0041] The three-roll mill is a hydraulic three-roll mill or a CNC three-roll mill.

[0042] The described polyurethane conductive additive is used in wood coatings, automotive repair coatings, anti-corrosion coatings, floor paints, electronic coatings, textile coatings, and polyurethane waterproof coatings.

[0043] A method for using the above-mentioned polyurethane conductive additive, characterized in that the method specifically includes the following steps:

[0044] First, weigh out 0.2-2% by mass of polyurethane conductive additive and 98-99.8% by mass of polyurethane prepolymer, and set aside for later use;

[0045] The weighed polyurethane conductive additive and polyurethane prepolymer are dispersed in a high-speed disperser using a composite method to obtain the antistatic polyurethane material.

[0046] The dispersion parameters are: the rotation speed of the high-speed disperser is 1500-3000 r / min; the dispersion time is 15-30 min.

[0047] The polyurethane prepolymer includes single-component polyurethane prepolymer, two-component polyurethane prepolymer, and multi-component polyurethane prepolymer.

[0048] The coating thickness of the antistatic polyurethane material is 7-8 mil, and its sheet resistance should be less than 10 Ω. 9 ohms / sq.

[0049] Example:

[0050] The production method is three-roll mill grinding; the specific parameters used are as follows:

[0051] Phase 1:

[0052] When the carbon nanotubes and dispersant carrier materials are ground for the first pass using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 80 μm, and the distance between roller 2 and roller 3 is 40 μm; the rotation speed is 115 r / min.

[0053] When the carbon nanotubes and dispersant carrier materials are ground for the second time using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 60 μm, and the distance between roller 2 and roller 3 is 30 μm; the rotation speed is 115 r / min.

[0054] When the carbon nanotubes and dispersant carrier materials are ground for the third time by a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 40 μm, and the distance between roller 2 and roller 3 is 20 μm; the rotation speed is 150 r / min.

[0055] When the carbon nanotubes and dispersant carrier materials are ground for the fourth time by a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 20 μm, and the distance between roller 2 and roller 3 is 10 μm; the rotation speed is 150 r / min.

[0056] Phase Two:

[0057] When the carbon nanotubes and dispersant carrier materials are ground for the first pass using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 10 μm, and the distance between roller 2 and roller 3 is 5 μm; the rotation speed is 200 r / min.

[0058] When the carbon nanotubes and dispersant carrier materials are ground for the second time using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 5μm, and the distance between roller 2 and roller 3 is 5μm; the rotation speed is 200r / min.

[0059] When the carbon nanotubes and dispersant carrier materials are ground for the third time by a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 5μm, and the distance between roller 2 and roller 3 is 5μm; the rotation speed is 200r / min.

[0060] Example 1

[0061] Prepare 10g of single-walled carbon nanotubes and 90g of diisononyl cyclohexanedicarboxylate. Stir both in a container, seal, and let stand for 24 hours. Then, grind them using a three-roll mill as follows (first two steps of the first stage):

[0062] When the carbon nanotubes and dispersant carrier materials are ground for the first pass using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 80 μm, and the distance between roller 2 and roller 3 is 40 μm; the rotation speed is 115 r / min.

[0063] When the carbon nanotubes and dispersant carrier materials are ground for the second time using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 60 μm, and the distance between roller 2 and roller 3 is 30 μm; the rotation speed is 115 r / min.

[0064] In this embodiment, the polyurethane carbon nanotube conductive additive is applied to a two-component polyurethane floor coating, comprising the following components by weight: two-component polyurethane prepolymer A: 100 parts, two-component polyurethane prepolymer B: 15 parts, and polyurethane conductive additive: 0.21 parts. The above materials are placed in a mixing tank, and the mixing temperature is room temperature (approximately 25°C). The mixture is then dispersed at a high speed of 2000 r / min for 20 minutes using a high-speed disperser. After uniform mixing, the floor coating is applied to a 0.1 mm thick PE film, resulting in a coating thickness of 50 μm.

[0065] Basic data testing was performed on the antistatic polyurethane conductive film of this embodiment. The performance test data are as follows: the film is flat and smooth, and the surface resistivity is 9.21 × 10⁻⁶. 6 ohms / sq, water resistance, after soaking for one week: no change in appearance, no bubbles, no wrinkles, no peeling.

[0066] Example 2

[0067] Prepare 10g of single-walled carbon nanotubes and 90g of diisononyl cyclohexanedicarboxylate. Stir both in a container, seal, and let stand for 24 hours. Then, grind them using a three-roll mill as follows (four steps in the first stage):

[0068] When the carbon nanotubes and dispersant carrier materials are ground for the first pass using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 80 μm, and the distance between roller 2 and roller 3 is 40 μm; the rotation speed is 115 r / min.

[0069] When the carbon nanotubes and dispersant carrier materials are ground for the second time using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 60 μm, and the distance between roller 2 and roller 3 is 30 μm; the rotation speed is 115 r / min.

[0070] When the carbon nanotubes and dispersant carrier materials are ground for the third time by a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 40 μm, and the distance between roller 2 and roller 3 is 20 μm; the rotation speed is 150 r / min.

[0071] When the carbon nanotubes and dispersant carrier materials are ground for the fourth time by a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 20 μm, and the distance between roller 2 and roller 3 is 10 μm; the rotation speed is 150 r / min.

[0072] In this embodiment, the polyurethane carbon nanotube conductive additive is applied to a two-component polyurethane floor coating, comprising the following components by weight: two-component polyurethane prepolymer A: 100 parts, two-component polyurethane prepolymer B: 15 parts, and polyurethane conductive additive: 0.21 parts. The above materials are placed in a mixing tank, and the mixing temperature is room temperature (approximately 25°C). The mixture is then dispersed at a high speed of 2000 r / min for 20 minutes using a high-speed disperser. After uniform mixing, the floor coating is applied to a 0.1 mm thick PE film, resulting in a coating thickness of 50 μm.

[0073] Basic data testing was performed on the antistatic polyurethane conductive film of this embodiment. The performance test data are as follows: the film is flat and smooth, and the surface resistivity is 7.32 × 10⁻⁶. 6 ohms / sq, water resistance, after soaking for one week: no change in appearance, no bubbles, no wrinkles, no peeling.

[0074] Example 3

[0075] Prepare 10g of single-walled carbon nanotubes and 90g of diisononyl cyclohexanedicarboxylate. Stir both in a container, seal, and let stand for 24 hours. Then, use a three-roll mill as follows (four steps in the first stage and the first step in the second stage):

[0076] Phase 1:

[0077] When the carbon nanotubes and dispersant carrier materials are ground for the first pass using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 80 μm, and the distance between roller 2 and roller 3 is 40 μm; the rotation speed is 115 r / min.

[0078] When the carbon nanotubes and dispersant carrier materials are ground for the second time using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 60 μm, and the distance between roller 2 and roller 3 is 30 μm; the rotation speed is 115 r / min.

[0079] When the carbon nanotubes and dispersant carrier materials are ground for the third time by a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 40 μm, and the distance between roller 2 and roller 3 is 20 μm; the rotation speed is 150 r / min.

[0080] When the carbon nanotubes and dispersant carrier materials are ground for the fourth time by a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 20 μm, and the distance between roller 2 and roller 3 is 10 μm; the rotation speed is 150 r / min.

[0081] Phase Two:

[0082] When the carbon nanotubes and dispersant carrier materials are ground for the first pass using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 10 μm, and the distance between roller 2 and roller 3 is 5 μm; the rotation speed is 200 r / min.

[0083] In this embodiment, the polyurethane carbon nanotube conductive additive is applied to a two-component polyurethane floor coating, comprising the following components by weight: two-component polyurethane prepolymer A: 100 parts, two-component polyurethane prepolymer B: 15 parts, and polyurethane conductive additive: 0.21 parts. The above materials are placed in a mixing tank, and the mixing temperature is room temperature (approximately 25°C). The mixture is then dispersed at a high speed of 2000 r / min for 20 minutes using a high-speed disperser. After uniform mixing, the floor coating is applied to a 0.1 mm thick PE film, resulting in a coating thickness of 50 μm.

[0084] Basic data testing was performed on the antistatic polyurethane conductive film of this embodiment. The performance test data are as follows: the film is flat and smooth, and the surface resistivity is 5.25 × 10⁻⁶. 6 ohms / sq, water resistance, after soaking for one week: no change in appearance, no bubbles, no wrinkles, no peeling.

[0085] Example 4

[0086] Prepare 10g of single-walled carbon nanotubes and 90g of diisononyl cyclohexanedicarboxylate. Stir both in a container, seal, and let stand for 24 hours. Then, use a three-roll mill as follows (four steps in the first stage and the first and second steps in the second stage):

[0087] Phase 1:

[0088] When the carbon nanotubes and dispersant carrier materials are ground for the first pass using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 80 μm, and the distance between roller 2 and roller 3 is 40 μm; the rotation speed is 115 r / min.

[0089] When the carbon nanotubes and dispersant carrier materials are ground for the second time using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 60 μm, and the distance between roller 2 and roller 3 is 30 μm; the rotation speed is 115 r / min.

[0090] When the carbon nanotubes and dispersant carrier materials are ground for the third time by a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 40 μm, and the distance between roller 2 and roller 3 is 20 μm; the rotation speed is 150 r / min.

[0091] When the carbon nanotubes and dispersant carrier materials are ground for the fourth time by a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 20 μm, and the distance between roller 2 and roller 3 is 10 μm; the rotation speed is 150 r / min.

[0092] Phase Two:

[0093] When the carbon nanotubes and dispersant carrier materials are ground for the first pass using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 10 μm, and the distance between roller 2 and roller 3 is 5 μm; the rotation speed is 200 r / min.

[0094] When the carbon nanotubes and dispersant carrier materials are ground for the second time using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 5μm, and the distance between roller 2 and roller 3 is 5μm; the rotation speed is 200r / min.

[0095] In this embodiment, the polyurethane carbon nanotube conductive additive is applied to a two-component polyurethane floor coating, comprising the following components by weight: two-component polyurethane prepolymer A: 100 parts, two-component polyurethane prepolymer B: 15 parts, and polyurethane conductive additive: 0.21 parts. The above materials are placed in a mixing tank, and the mixing temperature is room temperature (approximately 25°C). The mixture is then dispersed at a high speed of 2000 r / min for 20 minutes using a high-speed disperser. After uniform mixing, the floor coating is applied to a 0.1 mm thick PE film, resulting in a coating thickness of 50 μm.

[0096] Basic data testing was performed on the antistatic polyurethane conductive film of this embodiment. The performance test data are as follows: the film is flat and smooth, and the surface resistivity is 2.22 × 10⁻⁶. 6 ohms / sq, water resistance, after soaking for one week: no change in appearance, no bubbles, no wrinkles, no peeling.

[0097] Example 5

[0098] Prepare 10g of single-walled carbon nanotubes and 90g of diisononyl cyclohexanedicarboxylate. Stir both in a container, seal, and let stand for 24 hours. Then, use a three-roll mill as follows (four steps in the first stage and three steps in the second stage):

[0099] Phase 1:

[0100] When the carbon nanotubes and dispersant carrier materials are ground for the first pass using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 80 μm, and the distance between roller 2 and roller 3 is 40 μm; the rotation speed is 115 r / min.

[0101] When the carbon nanotubes and dispersant carrier materials are ground for the second time using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 60 μm, and the distance between roller 2 and roller 3 is 30 μm; the rotation speed is 115 r / min.

[0102] When the carbon nanotubes and dispersant carrier materials are ground for the third time by a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 40 μm, and the distance between roller 2 and roller 3 is 20 μm; the rotation speed is 150 r / min.

[0103] When the carbon nanotubes and dispersant carrier materials are ground for the fourth time by a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 20 μm, and the distance between roller 2 and roller 3 is 10 μm; the rotation speed is 150 r / min.

[0104] Phase Two:

[0105] When the carbon nanotubes and dispersant carrier materials are ground for the first pass using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 10 μm, and the distance between roller 2 and roller 3 is 5 μm; the rotation speed is 200 r / min.

[0106] When the carbon nanotubes and dispersant carrier materials are ground for the second time using a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 5μm, and the distance between roller 2 and roller 3 is 5μm; the rotation speed is 200r / min.

[0107] When the carbon nanotubes and dispersant carrier materials are ground for the third time by a hydraulic three-roll mill, the distance between roller 1 and roller 2 is 5μm, and the distance between roller 2 and roller 3 is 5μm; the rotation speed is 200r / min.

[0108] In this embodiment, the polyurethane carbon nanotube conductive additive is applied to a two-component polyurethane floor coating, comprising the following components by weight: two-component polyurethane prepolymer A: 100 parts, two-component polyurethane prepolymer B: 15 parts, and polyurethane conductive additive: 0.21 parts. The above materials are placed in a mixing tank, and the mixing temperature is room temperature (approximately 25°C). The mixture is then dispersed at a high speed of 2000 r / min for 20 minutes using a high-speed disperser. After uniform mixing, the floor coating is applied to a 0.1 mm thick PE film, resulting in a coating thickness of 50 μm.

[0109] Basic data testing was performed on the antistatic polyurethane conductive film of this embodiment. The performance test data are as follows: the film is flat and smooth, and the surface resistivity is 1.37 × 10⁻⁶. 6 ohms / sq, water resistance, after soaking for one week: no change in appearance, no bubbles, no wrinkles, no peeling;

[0110] The resistivity histograms of the antistatic polyurethane conductive films in Examples 1-5 are shown below. Figure 2 As shown.

[0111] The preparation, application, and usage method of a polyurethane conductive additive provided in the embodiments of this application have been described in detail above. The descriptions of the embodiments above are only for the purpose of helping to understand the methods and core ideas of this application; at the same time, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

[0112] Certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The terms "comprising" and "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising / including but not limited to". "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error. The following descriptions in the specification are preferred embodiments for carrying out this application; however, these descriptions are for the purpose of illustrating the general principles of this application and are not intended to limit the scope of this application. The scope of protection of this application shall be determined by the appended claims.

[0113] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0114] It should be understood that the term "and / or" used in this article is merely a description of 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, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0115] The foregoing description illustrates and describes several preferred embodiments of this application. However, as previously stated, it should be understood that this application is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the application concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this application should be within the protection scope of the appended claims.

Claims

1. A method for preparing a polyurethane conductive additive, characterized in that, The preparation method specifically includes the following steps: S1) Weigh out the conductive carbon nanotubes and dispersant carrier according to the design ratio, and set aside; The polyurethane conductive additive, by weight percentage, comprises: 1-10 wt% conductive host carbon nanotubes and 90-99 wt% dispersant carrier; S2) After the conductive carbon nanotubes and dispersant carrier weighed in S1) are mixed evenly, they are placed in a grinder at room temperature for staged grinding to obtain the polyurethane conductive additive.

2. The preparation method according to claim 1, characterized in that, The specific process of the staged grinding in S2) is as follows: The grinding process employs a three-roll mill. First stage: Perform at least one grinding pass; the specific process during grinding is as follows: the distance between roller 1 and roller 2 is 30-100 μm, the distance between roller 2 and roller 3 is 25-150 μm; the rotation speed is 100-150 r / min; Second stage: Perform at least one grinding cycle; The specific process during grinding is as follows: the distance between roller 1 and roller 2 is 5-30 μm, and the distance between roller 2 and roller 3 is 1-15 μm; The rotational speed is 150-200 r / min.

3. The preparation method according to claim 1, characterized in that, The conductive host carbon nanotubes in S1) include single-walled carbon nanotubes, multi-walled carbon nanotubes and oligo-walled carbon nanotubes. The dispersant carrier includes esters and ethers; the ester is diisononyl cyclohexanedicarboxylate or glycidyl tert-cholate; The ether is dodecyl glycidyl ether, tetradecyl glycidyl ether, or fatty alcohol polyvinyl ether.

4. The preparation method according to claim 2, characterized in that, The three-roll mill is a hydraulic three-roll mill or a CNC three-roll mill.

5. The polyurethane conductive additive prepared by the method of any one of claims 1-4 is used in anti-corrosion coatings or polyurethane waterproof coatings.

6. A method for using a polyurethane conductive additive prepared by the preparation method of any one of claims 1-4, characterized in that, The method specifically includes the following steps: First, weigh out 0.2-2% by mass of polyurethane conductive additive and 98-99.8% by mass of polyurethane prepolymer, and set aside for later use; The weighed polyurethane conductive additive and polyurethane prepolymer are dispersed in a high-speed disperser using a composite method to obtain the antistatic polyurethane material.

7. The method according to claim 6, characterized in that, The dispersion parameters are: the rotation speed of the high-speed disperser is 1500-3000 r / min; the dispersion time is 15-30 min.

8. The method according to claim 6, characterized in that, The polyurethane prepolymer includes a single-component polyurethane prepolymer or a multi-component polyurethane prepolymer.

9. The method according to claim 6, characterized in that, The coating thickness of the antistatic polyurethane material is 7-8 mil, and its sheet resistance is less than 10 Ω. 9 ohms / sq.

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