A waterborne co-linear primer, a preparation method and application thereof

Abstract

The application relates to the technical field of paint, and particularly discloses a water-based collinear primer as well as a preparation method and application thereof. The water-based collinear primer provided by the application has a resistivity of 0.2-0.5 M omega and a roughness of 0.1-0.5 microns after film formation. Further, the water-based collinear primer comprises A material and B material. The A material comprises the following components in parts by weight: 41-62 parts of epoxy resin, 3-14 parts of titanium white, 3-12 parts of conductive carbon black, 5-15 parts of filler and 5-25 parts of water. The B material comprises a modified amine curing agent. The water-based collinear primer provided by the application has small resistivity, low roughness and good adhesion to composite materials. The water-based collinear primer can be coated on the surface of the composite material to realize collinear coating of the composite material and the metal material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of paint, in particular to a water-based co-linear primer and a preparation method and application thereof. BACKGROUND

[0002] Most of the traditional automobile body shell adopts metal material, and the paint of metal material is generally divided into four layers, namely electrophoresis layer, intermediate coating layer, color paint layer and varnish layer. Among them, the electrophoresis layer is the "foundation" of the paint, which is formed by dispersing charged particles in water-based or organic solution and depositing these particles on the surface of the metal vehicle body by using electric field, mainly playing a role of corrosion protection,

[0003] With the continuous development of the automobile industry, new composite materials are widely used in the vehicle body. However, there are few developments of composite material coatings on the market at present, and there are even fewer composite material coatings that can be electrophoresed with metal vehicle bodies. Therefore, developing a water-based co-linear primer that can be used for composite materials of vehicle bodies and can be electrophoresed with metal vehicle bodies has great significance for realizing the co-linear coating of composite materials and metal materials. SUMMARY

[0004] In order to obtain a water-based co-linear primer for composite materials and realize electrophoresis of composite vehicle bodies together with metal vehicle bodies, the present application provides a water-based co-linear primer and a preparation method and application thereof.

[0005] In a first aspect, the present application provides a water-based co-linear primer.

[0006] The water-based co-linear primer has a resistivity of 0.2-0.5 MΩ and a roughness of 0.1-0.5 μm after film formation.

[0007] The present application provides a water-based co-linear primer, which has a small resistivity and a narrow resistivity range. The water-based co-linear primer is coated on the surface of a composite vehicle body, and the coated composite vehicle body can be electrophoresed together with a metal vehicle body but does not deposit electrophoresis paint, so as to realize the co-linear coating of composite materials and metal materials. In addition, the water-based co-linear primer provided by the present application has a low roughness, so that the final product vehicle body has a very high gloss and a high brightness. The water-based co-linear primer provided by the present application has a small resistivity, so that the surface does not deposit electrophoresis paint after electrophoresis. In addition, the inventors found that the water-based co-linear primer provided by the present application has a slightly improved conductivity after electrophoresis, and the water-based co-linear primer can form a conductive layer on the surface of the composite material, which is beneficial to obtaining a more excellent construction effect in the subsequent electrostatic spraying process.

[0008] Optionally, the water-based co-linear primer comprises A material and B material.

[0009] The A material includes the following components by weight: 41-62 parts of epoxy resin, 3-14 parts of titanium white, 3-12 parts of conductive carbon black, 5-15 parts of filler, and 5-25 parts of water.

[0010] The B material includes a modified amine curing agent.

[0011] In the present application, the water-based co-linear primer includes components prepared from the above-mentioned components by weight. The inventors of the present application have found through experiments that when the addition amount of epoxy resin is too low or the addition amount of conductive carbon black is too high, the water-based co-linear primer obtained has a high surface roughness and poor adhesion to the substrate; and when the addition amount of epoxy resin is too high or the addition amount of conductive carbon black is too low, the water-based co-linear primer obtained has a too high resistivity. Therefore, the present application controls the addition amounts of epoxy resin and conductive carbon black within the above-mentioned ranges, so as to obtain a water-based co-linear primer with a surface roughness of 0.1-0.5 μm and a resistivity of 0.2-0.5 MΩ. After the water-based co-linear primer is applied to a composite material, it can be electrocoated together with a metal material without depositing the electrocoating paint, so as to realize co-linear coating of the composite material vehicle body and the metal material vehicle body.

[0012] Further, the A material includes the following components by weight: 45-55 parts of epoxy resin, 3-14 parts of titanium white, 5-12 parts of conductive carbon black, 5-15 parts of filler, and 5-25 parts of water.

[0013] In some embodiments, the weight parts of the epoxy resin can be 41-45 parts, 41-50 parts, 41-55 parts, 45-50 parts, 45-55 parts, 45-62 parts, 50-55 parts, 50-62 parts, or 55-62 parts.

[0014] In some specific embodiments, the weight parts of the epoxy resin can also be 41 parts, 45 parts, 50 parts, 55 parts, or 62 parts.

[0015] In some embodiments, the weight parts of the conductive carbon black can be 3-5 parts, 3-10 parts, 5-10 parts, 5-12 parts, or 10-12 parts.

[0016] In some specific embodiments, the weight parts of the conductive carbon black can also be 3 parts, 5 parts, 10 parts, or 12 parts.

[0017] Optionally, the A material further includes the following components by weight: 1-2 parts of dispersant, 1-7 parts of film-forming aid, 0.2-1 part of wetting agent, 0.4-1 part of defoaming agent, 0.4-1 part of leveling agent, and 0.5-2.5 parts of thickening agent.

[0018] In one specific embodiment, the A material comprises the following components by weight: epoxy resin 50 parts, titanium white 10 parts, conductive carbon black 5 parts, filler 10 parts, water 18 parts, dispersant 1.5 parts, film forming aid 5 parts, wetting agent 0.2 parts, defoaming agent 0.7 parts, leveling agent 0.8 parts, and thickening agent 1.5 parts.

[0019] Optionally, the epoxy resin has an epoxy equivalent weight of 150-550 g / eq.

[0020] Optionally, the epoxy resin has an epoxy equivalent weight of 450-550 g / eq.

[0021] In one specific embodiment, the epoxy resin has an epoxy equivalent weight of 170-200 g / eq or 490-550 g / eq.

[0022] Optionally, the conductive carbon black is selected from HYTIDE TD317A, Conductex 7055 Ultra, and LC-5000.

[0023] In a second aspect, the present application provides a preparation method of a water-based co-linear primer.

[0024] A preparation method of a water-based co-linear primer, comprising preparing an A material, preparing a water-based co-linear primer;

[0025] The step of preparing the water-based co-linear primer is mixing the A material and the B material in a ratio of (4-6):1, stirring uniformly, and obtaining the water-based co-linear primer.

[0026] In the present application, when the ratio of the A material to the B material in the water-based co-linear primer is <4:1, the drying speed of the obtained water-based co-linear primer is too fast, the flatness of the paint film is poor, the surface roughness is high, and the adhesion of the paint film to the substrate surface is reduced; when the ratio of the A material to the B material in the water-based co-linear primer is >6:1, the curing effect of the obtained water-based co-linear primer is poor, the roughness of the paint film of the water-based co-linear primer formed is high, and the adhesion of the paint film to the substrate surface is reduced. Therefore, through experimental exploration, it is found that when the ratio of the A material to the B material is controlled within the above range, a water-based co-linear primer with small resistivity and low roughness can be obtained, which is more suitable for co-linear coating.

[0027] In some embodiments, the ratio of the A material to the B material can be (4-5):1 or (5-6):1.

[0028] In one specific embodiment, the ratio of the A material to the B material can also be 4:1, 5:1, or 6:1.

[0029] Optionally, the specific steps for preparing the A material are as follows:

[0030] (1) adding water, film forming aid into the ingredient tank at a rotating speed of 500±50 rpm; then adding defoaming agent and dispersant and stirring for 5-10 min; then adding conductive carbon black, titanium dioxide and filler, adjusting the rotating speed to 1000±50 rpm, and stirring for 15-25 min to obtain a mixed slurry;

[0031] (2) grinding the mixed slurry to a fineness of ≤10 μm to obtain a ground slurry;

[0032] (3) adding epoxy resin to the ground slurry, stirring at a rotating speed of 500±50 rpm for 5-10 min, then adding defoaming agent and leveling agent and stirring for 10-15 min; finally adding thickening agent and increasing the rotating speed to 800±50 rpm, and stirring for 15-20 min to obtain A material.

[0033] In a third aspect, the application further provides application of the above-mentioned water-based co-line primer in an automobile.

[0034] In summary, the application has the following beneficial effects:

[0035] 1. The application provides a water-based co-line primer with a resistivity of 0.2-0.5 MΩ and a roughness of 0.1-0.5 μm after film formation. The water-based co-line primer is coated on the surface of a composite material, and then the composite material is subjected to electrophoresis together with a metal material. Since the resistivity of the co-line primer is low, the electrophoretic paint can only be deposited on the surface of the metal material, but not on the surface of the composite material. Therefore, the co-line primer can realize co-line coating of the composite material vehicle body and the metal material vehicle body, greatly shortening the production process and reducing the cost of automobile topcoat spraying.

[0036] 2. After electrophoresis, the resistivity of the paint film formed by the water-based co-line primer provided by the application is further reduced, and the conductivity is improved, so that a conductive layer can be formed on the surface of the composite material. The conductive layer can ensure better construction effect in subsequent electrostatic spraying process.

[0037] 3. The water-based co-line primer provided by the application has low surface roughness, which can ensure that the final product has excellent gloss and fresh reflection.

[0038] 4. In the application, due to the molding process of the composite material SMC, stress accumulation, additive precipitation, release agent residue and the like exist on the surface of the composite material SMC, and paint is difficult to accumulate on such substrate. Therefore, it is necessary to polish the substrate before coating. However, the water-based co-line primer provided by the application has good adhesion to the composite material SMC, and it is not necessary to polish the substrate before coating, but only to wipe with alcohol. DETAILED DESCRIPTION

[0039] The application provides a water-based co-line primer, which comprises A material and B material.

[0040] The A material includes the following components by weight: epoxy resin 41-62 parts, titanium white powder 3-14 parts, conductive carbon black 3-12 parts, filler 5-15 parts, water 5-25 parts, dispersant 1-2 parts, film forming aid 1-7 parts, wetting agent 0.2-1 part, defoaming agent 0.4-1 part, leveling agent 0.4-1 part, thickening agent 0.5-2.5 parts;

[0041] The B material includes a modified amine curing agent.

[0042] The preparation method of the above-mentioned water-based co-linear primer includes the following steps:

[0043] (1) Preparation of A material:

[0044] (1-1) Add water and film forming aid to the batching tank at a speed of 500±50 rpm; then add defoaming agent and dispersant and stir for 5-10 min; then add conductive carbon black, titanium white powder and filler, and adjust the speed to 1000±50 rpm, and stir for 15-25 min to obtain a mixed slurry;

[0045] (1-2) Grind the mixed slurry to a fineness of ≤10 μm to obtain a ground slurry;

[0046] (1-3) Add epoxy resin to the ground slurry, stir at a stirring speed of 500±50 rpm for 5-10 min, then add defoaming agent and leveling agent and stir for 10-15 min; finally add thickening agent and increase the speed to 800±50 rpm, and stir for 15-20 min to obtain A material.

[0047] (2) Preparation of water-based co-linear primer: Mix A material and B material according to a ratio of (4-6): 1, stir uniformly to obtain a water-based co-linear primer.

[0048] In the present application, the epoxy resin is purchased from Huntsman, model Araldite PZ 3961, epoxy equivalent weight is 490-550 g / eq; titanium dioxide is model R996; conductive carbon black is model HYTIDE TD317A, Conductex 7055 Ultra or LC-5000; filler is talc powder, purchased from Guangfu Jiancai (Jiaoling) Jinghua Co., Ltd., model MS-2500; dispersant is purchased from BYK, model Disperbyk 192; coalescent is model Texanol; wetting agent is purchased from Wincrete, model SURFYNOL 104; defoamer is purchased from BYK, model BYK 024; leveling agent is model Tego Twin 4100; thickener is purchased from BYK, model RHEOBYK-L 100 or RHEOBYK-H 3300 VF; modified amine curing agent is purchased from Huntsman, model Aradur 3986, active hydrogen equivalent weight is 415 g / eq. In the present application, the remaining raw materials, solvents, etc. can be obtained by commercial purchase.

[0049] The present application is further described in detail below in combination with preparation examples, examples and performance test.

[0050] Preparation examples 1-8

[0051] Preparation examples 1-8 respectively provide an A material of a water-based co-linear primer.

[0052] The differences of the above preparation examples are that the addition amounts of epoxy resin and conductive carbon black in the A material, which are shown in the following Table 1.

[0053] The preparation method of the water-based co-linear primer A material provided by preparation examples 1-8 comprises the following steps:

[0054] (1-1) 18 g of water, 5 g of coalescent, 0.7 g of defoamer and 1.5 g of dispersant were added into a batching tank at a rotation speed of 500 rpm, stirred for 5 min, then 10 g of titanium dioxide, 10 g of talc powder and LC-5000 conductive carbon black were added, the rotation speed was adjusted to 1000 rpm, and stirred for 20 min to obtain a mixed slurry;

[0055] (1-2) The mixed slurry was ground to a fineness of 8 μm to obtain a ground slurry;

[0056] (1-3) The epoxy resin was added into the ground slurry, stirred at a stirring rotation speed of 500 rpm for 5 min, then 0.7 g of defoamer and 0.8 g of leveling agent were added, and stirred for 10 min; finally, 0.1 g of RHEOBYK-L 100 thickener and 0.6 g of RHEOBYK-H 3300 VF thickener were added, and the rotation speed was increased to 800 rpm, and stirred for 15 min to obtain the A material.

[0057] Table 1 Addition amount of epoxy resin and conductive carbon black in A material provided by Preparation Example 1-8

[0058]

[0059] Preparation Example 9

[0060] Preparation Example 9 provides an A material of a water-based co-linear primer.

[0061] The above preparation example is different from Preparation Example 3 in that the type of conductive carbon black in the A material is HYTIDE TD317A.

[0062] Preparation Example 10

[0063] Preparation Example 10 provides an A material of a water-based co-linear primer.

[0064] The above preparation example is different from Preparation Example 3 in that the type of conductive carbon black in the A material is Conductex 7055 Ultra.

[0065] Preparation Example 11

[0066] Preparation Example 11 provides an A material of a water-based co-linear primer.

[0067] The above preparation example is different from Preparation Example 3 in that the epoxy resin in the A material is an alicyclic epoxy resin TTA3150, and the epoxy equivalent weight is 170-200 g / eq.

[0068] Comparative Preparation Example 1

[0069] Comparative Preparation Example 1 provides an A material of a water-based co-linear primer.

[0070] The above comparative preparation example is different from Preparation Example 3 in that the addition amount of epoxy resin in the A material is 36 g.

[0071] Comparative Preparation Example 2

[0072] Comparative Preparation Example 2 provides an A material of a water-based co-linear primer.

[0073] The above comparative preparation example is different from Preparation Example 3 in that the addition amount of epoxy resin in the A material is 68 g.

[0074] Comparative Preparation Example 3

[0075] Comparative Preparation Example 3 provides an A material of a water-based co-linear primer.

[0076] The above comparative preparation example is different from Preparation Example 3 in that the addition amount of conductive carbon black in the A material is 0 g.

[0077] Comparative Preparation Example 4

[0078] Comparative Preparation Example 4 provides an A material of a waterborne co-linear primer.

[0079] The above Comparative Preparation Example differs from Preparation Example 3 in that the amount of conductive carbon black added to the A material is 15 g.

[0080] Examples 1-11

[0081] Examples 1-11 each provide a waterborne co-linear primer.

[0082] The above Examples differ in that the A material of the waterborne co-linear primer is derived from Preparation Examples 1-11, respectively.

[0083] The above method of preparing a waterborne co-linear primer includes the following steps:

[0084] (1) Preparation of the A material: The A material is prepared according to the method of the Preparation Example.

[0085] (2) Preparation of the waterborne co-linear primer: The A material and the B material are mixed in a ratio of 5:1, and stirred until uniform, to obtain the waterborne co-linear primer.

[0086] In the above Examples, the B material is a modified amine curing agent (Huntsman, model Aradur 3986).

[0087] Example 12

[0088] Example 12 provides a waterborne co-linear primer.

[0089] The above Example differs from Example 3 in that the ratio of the A material to the B material in the waterborne co-linear primer is 4:1.

[0090] Example 13

[0091] Example 13 provides a waterborne co-linear primer.

[0092] The above Example differs from Example 3 in that the ratio of the A material to the B material in the waterborne co-linear primer is 6:1.

[0093] Comparative Examples 1-4

[0094] Comparative Examples 1-4 each provide a waterborne co-linear primer.

[0095] The above Comparative Examples differ from Example 3 in that the A material of the waterborne co-linear primer is derived from Comparative Preparation Examples 1-4, respectively.

[0096] Comparative Example 5

[0097] Comparative Example 5 provides a waterborne co-linear primer.

[0098] The above comparative example differs from Example 3 in that the ratio of A material to B material in the aqueous co-linear primer is 3:1.

[0099] Comparative Example 6

[0100] Comparative Example 6 provides an aqueous co-linear primer.

[0101] The above comparative example differs from Example 3 in that the ratio of A material to B material in the aqueous co-linear primer is 7:1.

[0102] Performance detection test

[0103] The aqueous co-linear primers provided by Examples 1-13 and Comparative Examples 1-6 of the present application and a commercially available oil-based paint (model CHG-X-007) were subjected to performance detection, including roughness, resistivity, and adhesion. The results are shown in Table 2 below.

[0104] The aqueous co-linear primer or the commercially available oil-based paint was sprayed on a vehicle body (the vehicle body substrate was SMC) on the production line of the main engine factory, and the surface roughness, resistivity, and adhesion of the paint film formed by the sprayed aqueous co-linear primer were detected; then the vehicle body was subjected to electrophoresis (the electrophoresis primer was NTB-G-3), and the resistivity of the paint film formed by the aqueous co-linear primer was detected after electrophoresis.

[0105] The detection method for surface roughness refers to ISO 1997; the detection method for resistivity refers to QJ 2220.2-1992; and the detection method for adhesion refers to GB / T 9286-2021. Among them, the adhesion is graded as follows: 0 grade - no shedding in the grid; 1 grade - grid shedding ≤5%; 2 grade - grid shedding 5-15%; 3 grade - grid shedding 15-35%; 4 grade - grid shedding 35-65%; 5 grade - grid shedding ≥65%;

[0106] Table 2 Performance detection results of Examples 1-13, Comparative Examples 1-6, and commercially available oil-based paint

[0107]

[0108]

[0109] Note: "-" in the table indicates that the resistivity is too large to be out of range, and cannot be obtained.

[0110] According to the detection results in Table 2, the surface roughness of the water-based co-line primer of the present application Examples 1-13 after the vehicle body spraying is 0.1-0.5 μm, the resistance before electrophoresis is 0.2-1 MΩ, and the adhesion level with the substrate is all 0 level. While the surface roughness of the commercially available oil-based paint after the vehicle body spraying is 0.8 μm, the resistance before electrophoresis is 6.3 MΩ, and the adhesion level with the substrate is 1 level. Therefore, it is illustrated that the water-based co-line primer provided by the present application has a small and narrow range of resistivity and low surface roughness after film formation, and can realize the co-line coating of composite materials and metal materials, and the vehicle body finally obtained has very high gloss and fresh reflection.

[0111] According to the detection results of Examples 1-5 and Comparative Examples 1-2, with the increase of the amount of epoxy resin in A material, the surface roughness and resistivity of the obtained water-based co-line primer both show a trend of first decreasing and then increasing. Further comparison shows that when the amount of epoxy resin in A material is controlled to 41 parts in Example 1, the surface roughness of the obtained water-based co-line primer is 0.5 μm, and the resistivity before electrophoresis is 0.8 MΩ; when the amount of epoxy resin in A material is controlled to 62 parts in Example 5, the surface roughness of the obtained water-based co-line primer is 0.4 μm, and the resistivity before electrophoresis is 1 MΩ; and when the amount of epoxy resin in A material is controlled to 45-55 parts in Examples 2-4, the surface roughness of the obtained water-based co-line primer is ≤0.3 μm, and the resistivity before electrophoresis is ≤0.5 MΩ. Therefore, it is illustrated that the present application further controls the amount of epoxy resin in A material to be within the range of 45-55 parts, which can obtain a water-based co-line primer with good adhesion to the substrate, lower surface roughness and smaller resistivity.

[0112] According to the detection results of Examples 3, 6-8 and Comparative Examples 3-4, with the increase of the amount of conductive carbon black in A material, the surface roughness of the obtained water-based co-line primer slightly increases, while the resistivity shows a trend of first decreasing and then basically remaining unchanged. Further comparison shows that when the amount of conductive carbon black in A material is controlled to 3 parts in Example 6, the resistivity before electrophoresis of the obtained water-based co-line primer is 0.7 MΩ; and when the amount of conductive carbon black in A material is controlled to 5-12 parts in Examples 1, 7-8, the surface roughness of the obtained water-based co-line primer is ≤0.2 μm, and the resistivity before electrophoresis is ≤0.5 MΩ. Therefore, it is illustrated that the present application further controls the amount of conductive carbon black in A material to be within the range of 5-12 parts, which can obtain a water-based co-line primer with good adhesion to the substrate and smaller resistivity.

[0113] The detection results of Example 3, Examples 9-10 show that the resistivity of the water-based co-line primer obtained in Example 3 and Example 9 before electrophoresis is 0.4 MΩ; and the resistivity of the water-based co-line primer obtained in Example 10 is as low as 0.2 MΩ. Therefore, it is illustrated that the water-based co-line primer prepared by using the conductive carbon black with the model of Conductex 7055 Ultra has a lower resistivity, is more suitable for co-line coating, and ensures that the composite material surface is not deposited with electrophoretic paint.

[0114] The detection results of Example 3, Example 11 show that the surface roughness of the water-based co-line primer prepared by using the epoxy resin with an epoxy equivalent of 170-200 g / eq in Example 11 is 0.5 μm, and the resistivity is 0.8 MΩ; and the surface roughness of the water-based co-line primer prepared by using the epoxy resin with an epoxy equivalent of 490-550 g / eq in Example 3 is 0.1 μm, and the resistivity before electrophoresis is 0.4 MΩ. Therefore, it is illustrated that the water-based co-line primer prepared by using the epoxy resin with an epoxy equivalent of 450-550 g / eq has better use performance.

[0115] The detection results of Example 3, Examples 12-13, Comparative Examples 5-6 show that the water-based co-line primer prepared by mixing A material and B material in a ratio of (4-6):1 in Example 3 and Examples 12-13 has a surface roughness of 0.1-0.3 μm and a resistivity of 0.4-0.8 MΩ; the water-based co-line primer prepared by mixing A material and B material in a ratio of 3:1 in Comparative Example 5 has a surface roughness of 0.3 μm and a resistivity of 1.4 MΩ before electrophoresis; and the water-based co-line primer prepared by mixing A material and B material in a ratio of 7:1 in Comparative Example 6 has a surface roughness of 0.5 μm and a resistivity of 2.3 MΩ before electrophoresis. Therefore, it is illustrated that the water-based co-line primer prepared by mixing A material and B material in a ratio of (4-6):1 has a low surface roughness and resistivity, and has a better co-line coating effect.

[0116] According to the detection results of the resistivity before and after electrophoresis, the water-based co-line primer provided in Examples 1-13 has a reduced resistivity and improved conductivity after electrophoresis, which illustrates that the water-based co-line primer can form a conductive layer on the surface of the composite material, and the conductive layer can facilitate the subsequent electrostatic spraying process, so that the water-based co-line primer coating and the intermediate coating can have a more excellent adhesion.

[0117] Although the present application has been described in detail with general description and specific embodiments above, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application, are within the scope of the present application.

Claims

1. An aqueous co-linear primer for composite materials, characterized in that, The resistivity of the water-based co-linear primer after film formation is 0.2-0.5 MΩ, and the roughness is 0.1-0.3 μm; the water-based co-linear primer comprises A material and B material; The A material comprises the following components in parts by weight: epoxy resin 45-55 parts, titanium white powder 3-14 parts, conductive carbon black 5-12 parts, filler 5-15 parts, and water 5-25 parts; the epoxy resin has an epoxy equivalent of 490-550 g / eq; The B material comprises a modified amine curing agent; The mass ratio of the A material to the B material is (4-6):

1.

2. The aqueous co-linear primer of claim 1, wherein, The A material further comprises the following components in parts by weight: dispersant 1-2 parts, film-forming aid 1-7 parts, wetting agent 0.2-1 part, defoaming agent 0.4-1 part, leveling agent 0.4-1 part, and thickening agent 0.5-2.5 parts.

3. The aqueous co-linear primer according to any one of claims 1-2, characterized in that, The conductive carbon black is selected from HYTIDE TD317A and Conductex 7055 Ultra.

4. The method of preparing an aqueous co-linear primer according to any one of claims 1 to 3, wherein The method comprises preparing the A material, preparing the water-based co-linear primer; The step of preparing the water-based co-linear primer is mixing the A material and the B material in a mass ratio of (4-6):1, stirring uniformly, and obtaining the water-based co-linear primer.

5. Use of the water-based co-linear primer according to any one of claims 1-3, or the water-based co-linear primer obtained by the method for preparing the water-based co-linear primer according to claim 4 in an automobile.

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