A water-based primer coating for golf head and preparation method thereof

Abstract

The present invention relates to the technical field of water-based coatings, and specifically discloses a water-based primer coating for a golf head and a preparation method thereof. A water-based primer coating for a golf head comprises the following components: a water-based hydroxy acrylic dispersion, a water-based polyurethane resin, a methyl etherified amino resin, a film-forming aid, deionized water, a thixotropic agent, an adhesion promoter, a pH regulator, a thickener, a leveling agent and a defoaming agent. A preparation method for a water-based primer coating for a golf head comprises mixing and stirring the components evenly to obtain a water-based primer coating for a golf head. The water-based primer coating for a golf head of the present application has good hardness, adhesion and wear resistance. The paint film formed by the water-based primer coating for a golf head of the present application not only has good adhesion to a metal substrate and a topcoat, but can also further improve the quality of the golf head.

Description

Technical Field

[0001] The invention relates to the technical field of water-based coatings, in particular to a water-based primer coating for a golf head and a preparation method thereof. Background Art

[0002] In recent years, the concept of environmental protection has become more and more popular, and environmentally friendly water-based paints have been vigorously developed in the paint industry.

[0003] At present, in the manufacturing of golf heads, the main solvent-based two-component low-temperature baking paint is used. In the manufacturing process of golf heads, the solvent-based two-component low-temperature baking paint not only releases a large amount of pollutants into the environment, which is extremely unfriendly to the environment, but also needs to be prepared and used immediately, and there is a specified working time. If the production and manufacturing is not completed within the specified working time, the paint will be scrapped.

[0004] In order to reduce environmental pollution and improve the utilization rate of coatings, some studies have tried to use water-based coatings to replace solvent-based two-component low-temperature baking coatings. Although water-based coatings can reduce pollution and improve the utilization rate of coatings to a certain extent, the performance of water-based coatings is not as comprehensive as that of solvent-based two-component low-temperature baking coatings, especially the hardness of water-based coatings is difficult to reach the hardness of solvent-based two-component low-temperature baking coatings. The coating for golf heads must have good hardness to withstand external impact and friction, so as to avoid paint peeling when the golf head is in use and ensure the good quality of the golf head.

[0005] In view of the above-mentioned related art, the inventor believes that it is necessary to further improve the hardness of the water-based paint so that the water-based paint is suitable for golf heads. Summary of the invention

[0006] In order to further improve the hardness of water-based coatings, the present application provides a water-based primer coating for golf heads and a preparation method thereof. The present application uses water-based hydroxy acrylic dispersion and water-based polyurethane resin as the main ingredients of the primer coating, uses methyl etherified amino resin as a curing agent, and uses the water-based hydroxy acrylic dispersion, water-based polyurethane resin and methyl etherified amino resin to cooperate with each other, and through the synergistic effect of the three, the prepared water-based primer coating for golf heads has good hardness.

[0007] In the first aspect, the present application provides a water-based primer coating for a golf head, which adopts the following technical scheme: a water-based primer coating for a golf head, comprising the following components in parts by mass: 30 to 35 parts of an aqueous hydroxylated acrylic dispersion, 10 to 15 parts of an aqueous polyurethane resin, 7 to 9 parts of a methylated amino resin, 7 to 10 parts of a film-forming aid, 8 to 16 parts of deionized water, 0.1 to 1 part of a thixotropic agent, 0.5 to 3 parts of an adhesion promoter, 0.1 to 2 parts of a pH adjuster, 0.1 to 2 parts of a thickener, 0.1 to 0.5 parts of a leveling agent, and 0.1 to 0.5 parts of a defoaming agent.

[0008] In the above technical scheme, 30 to 35 parts of water-based hydroxy acrylic dispersion and 10 to 15 parts of water-based polyurethane resin are used as the main ingredients of the water-based primer coating, and 7 to 9 parts of methyl etherified amino resin are used as the curing agent. The water-based hydroxy acrylic dispersion, water-based polyurethane resin and methyl etherified amino resin are strictly proportioned and coordinated. The paint film formed by the cross-linking reaction at above 100°C not only has good adhesion to different metal substrates, but also has good bonding ability with the topcoat.

[0009] Specifically, during the curing process of the water-based primer coating, the water-based hydroxy acrylic dispersion and the water-based polyurethane resin can effectively inhibit the self-condensation reaction of the methyl ether amino resin, and promote the cross-linking reaction between the three to form a dense macromolecular network structure on the golf head, so that the water-based primer coating is firmly attached to the metal substrate of the golf head. At the same time, the reaction of the water-based hydroxy acrylic dispersion, the water-based polyurethane resin and the methyl ether amino resin further promotes the cross-linking reaction between the components of the water-based primer coating for the golf head, so that the reaction between the components of the water-based primer coating for the golf head is more thorough, and the chain is extended on the basis of the dense macromolecular network structure to form more molecular branches, which further improves the hardness and adhesion of the water-based primer coating for the golf head, and further improves the wear resistance of the water-based primer coating for the golf head, so that the golf head can withstand external impact and friction well, and further promotes the application of water-based primer coating in golf heads.

[0010] Preferably, the film-forming aid includes ethyl glycolate, diethylene glycol monoethyl ether, and hydroxypivalate.

[0011] In the above technical scheme, by adding ethyl glycolate, diethylene glycol monoethyl ether and hydroxypivalate to the water-based primer coating for golf heads, the drying speed of the water-based primer coating for golf heads can be further improved, so that the prepared paint film is tight, smooth, has good density and continuity, further improves the wear resistance of the water-based primer coating for golf heads, and further reduces the operation time of using the water-based primer coating for golf heads.

[0012] Preferably, the mass ratio of ethyl glycolate, diethylene glycol monoethyl ether and hydroxypivalate is 1:(1-2):(1-2).

[0013] In the above technical scheme, by adding the above-mentioned specific mass proportion of ethyl glycolate, diethylene glycol monoethyl ether and hydroxypivalate to the water-based primer coating for golf heads, the drying rate of the water-based primer coating for golf heads can be further optimized, the painting time of the water-based primer coating for golf heads can be further reduced, and the painting efficiency can be improved, so that the water-based primer coating for golf heads has a better prospect for industrial application.

[0014] Preferably, the thixotropic agent is a waterborne polyurethane thixotropic agent.

[0015] In the above technical scheme, by adding a water-based polyurethane thixotropic agent into the water-based primer coating for golf heads, the fluidity of the water-based primer coating for golf heads during use and the stability under static conditions can be well guaranteed, so that the water-based primer coating for golf heads can maintain a good dispersion state during transportation and storage, without stratification, floating or agglomeration.

[0016] Preferably, the adhesion promoter is an alkoxysilane containing an amino functional group.

[0017] In the above technical solution, by adding alkoxysilane containing amino functional groups into the water-based primer coating for golf heads, the bonding strength between the coating and the metal substrate can be further improved, and the wear resistance of the water-based primer coating for golf heads can be further enhanced.

[0018] Preferably, the pH adjuster is an alkanolamine.

[0019] In the above technical scheme, by adding alkanolamine to the water-based primer coating for golf heads, the stability of the water-based primer coating for golf heads can be further improved, ensuring that the water-based primer coating for golf heads can maintain good stability during transportation and storage without stratification, floating or agglomeration.

[0020] Preferably, the thickener is one or more of a polyurethane thickener and an alkali swelling thickener.

[0021] In the above technical solution, by adding one or more of the polyurethane thickener and the alkali swelling thickener into the water-based primer coating for golf heads, it can be well compatible with other components in the water-based primer coating for golf heads, and play a good role in coordinating the stability of the coating system.

[0022] Preferably, the leveling agent is a silicone surfactant leveling agent.

[0023] In the above technical scheme, by adding the organosilicon surfactant leveling agent into the water-based primer coating for golf heads, the leveling property of the water-based primer coating for golf heads can be well adjusted. Combined with the film-forming aid formed by compounding ethyl glycolate, diethylene glycol monoethyl ether and hydroxypivalate, the surface of the prepared paint film is smooth and pinhole-free, which plays an important role in the subsequent coating of topcoat and improving the bonding strength between the topcoat and the primer.

[0024] Preferably, the defoamer is BYK-012.

[0025] In the above technical scheme, by adding BYK-012 to the water-based primer coating for golf heads, the generation of bubbles in the water-based primer coating for golf heads can be effectively suppressed. In combination with the silicone surfactant leveling agent, ethyl glycolate, diethylene glycol monoethyl ether and hydroxypivalate, they work together from different mechanisms to make the surface of the prepared paint film flat and smooth without cavities and pinholes, which not only improves the aesthetics of the water-based primer coating for golf heads, but also plays an important role in the subsequent coating of topcoat and improving the bonding strength between the topcoat and the primer.

[0026] In a second aspect, the present application provides a method for preparing a water-based primer coating for a golf head using the following technical solution:

[0027] A method for preparing a water-based primer coating for a golf head comprises the following steps:

[0028] S1: Mix the water-based hydroxy acrylic dispersion, the water-based polyurethane resin and the defoamer, and stir to disperse them evenly;

[0029] S2: Add methyl etherified amino resin and stir to disperse evenly;

[0030] S3: Mix deionized water and film-forming aid and add them to the solution obtained in S2, and continue stirring until the dispersion is uniform;

[0031] S4: While stirring, continue to add adhesion promoter, thixotropic agent, thickener and leveling agent in sequence, and continue stirring until they are evenly dispersed;

[0032] S5: The pH of the solution is adjusted to between 7.5 and 9 using a pH adjuster to obtain a water-based primer coating for a golf head.

[0033] The water-based primer coating for golf heads prepared by the above technical solution has good system stability and can be used directly without the need for ready preparation like solvent-based two-component low-temperature baking coatings. This simplifies the painting process and improves industrial production efficiency.

[0034] Preferably, the process conditions in S1 are dispersion at 800-1000 r / min for 10-20 min; the process conditions in S2 are dispersion at 800-1000 r / min for 10-15 min; the process conditions in S3 are dispersion at 800-1000 r / min for 10-15 min; the process conditions in S4 are dispersion at 800-1000 r / min for 10-15 min.

[0035] Through the above technical solution and by limiting the above process conditions, the components of the prepared water-based primer coating for golf heads are dispersed more evenly, further improving the system stability of the water-based primer coating for golf heads.

[0036] In summary, the present application includes at least one of the following beneficial technical effects:

[0037] 1. The present application uses 30 to 35 parts of water-based hydroxy acrylic dispersion and 10 to 15 parts of water-based polyurethane resin as the main ingredients of the water-based primer coating, and 7 to 9 parts of methyl etherified amino resin as a curing agent. The water-based hydroxy acrylic dispersion, water-based polyurethane resin and methyl etherified amino resin are strictly matched and coordinated. The paint film formed by the cross-linking reaction at above 100° C. not only has good adhesion to different metal substrates, but also has good bonding ability with the topcoat.

[0038] 2. The present application can further improve the drying speed of the water-based primer coating for golf heads by adding ethyl glycolate, diethylene glycol monoethyl ether and hydroxypivalate to the water-based primer coating for golf heads, so that the prepared paint film is tight, smooth, dense and continuous, further improving the wear resistance of the water-based primer coating for golf heads and further reducing the operation time of using the water-based primer coating for golf heads.

[0039] 3. In the present application, BYK-012, silicone surfactant leveling agent, ethyl glycolate, diethylene glycol monoethyl ether and hydroxypivalate are added to the water-based primer coating for golf heads. These substances work together from different mechanisms to make the surface of the prepared paint film flat and smooth without cavities and pinholes, which not only improves the aesthetics of the water-based primer coating for golf heads, but also plays an important role in the subsequent coating of topcoat and improving the bonding strength between the topcoat and the primer. DETAILED DESCRIPTION

[0040] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0041] Example 1

[0042] A water-based primer coating for a golf head comprises 30 g of a water-based hydroxy acrylic dispersion, 10 g of a water-based polyurethane resin, 7 g of a methyl etherified amino resin, 7 g of a film-forming aid, 8 g of deionized water, 0.1 g of a thixotropic agent, 0.5 g of an adhesion promoter, 0.1 g of a pH regulator, 0.1 g of a thickener, 0.1 g of a leveling agent, and 0.1 g of a defoaming agent.

[0043] Among them, the water-based hydroxylated acrylic dispersion was purchased from Dow Chemical (China) Co., Ltd.

[0044] Among them, the water-based polyurethane resin was purchased from Allnex Resins (China) Co., Ltd.

[0045] Among them, the methyl etherified amino resin was purchased from Changxing Chemical Industry (China) Co., Ltd.

[0046] The film-forming aid was XUS 40782, which was purchased from Dow Chemical (China) Co., Ltd.

[0047] Among them, the thixotropic agent is a water-based polyurethane thixotropic agent, which was purchased from Evonik Chemicals (Guangzhou) Co., Ltd.

[0048] Among them, the adhesion promoter is an alkoxysilane containing an amino functional group, which was purchased from Changxing Chemical Industry (China) Co., Ltd.

[0049] The pH adjuster is AMP-95, which was purchased from Dow Chemical (China) Co., Ltd.

[0050] Among them, the thickener is an alkali swelling thickener purchased from Dow Chemical (China) Co., Ltd.

[0051] Among them, the leveling agent is BYK-346, which was purchased from BYK Additives (Shanghai) Co., Ltd.

[0052] The defoaming agent is BYK-012, which was purchased from BYK Additives (Shanghai) Co., Ltd.

[0053] The preparation method of the water-based primer coating for golf heads comprises the following steps:

[0054] S1: Mix the water-based hydroxy acrylic dispersion, water-based polyurethane resin and defoamer, and disperse at 800 r / min for 20 minutes.

[0055] S2: Add methyl etherified amino resin and disperse at 800r / min for 15min.

[0056] S3: Mix deionized water and film-forming aid and add them to the solution obtained in S2, and disperse at 800 r / min for 15 minutes.

[0057] S4: While stirring, continue to add adhesion promoter, thixotropic agent, thickener and leveling agent in sequence, and disperse at 800r / min for 15 minutes.

[0058] S5: Slowly add a pH adjuster while stirring, and adjust the pH of the solution to 9 with the pH adjuster to obtain a water-based primer coating for a golf head.

[0059] Example 2

[0060] A water-based primer coating for a golf head, which is different from Example 1 in that it includes 32g of water-based hydroxy acrylic dispersion, 13g of water-based polyurethane resin, 8g of methyl etherified amino resin, 9g of film-forming aid, 14g of deionized water, 0.5g of thixotropic agent, 1.3g of adhesion promoter, 1g of pH regulator, 1g of thickener, 0.2g of leveling agent, and 0.3g of defoaming agent.

[0061] The preparation method of the water-based primer coating for golf heads comprises the following steps:

[0062] S1: Mix the aqueous hydroxy acrylic dispersion, aqueous polyurethane resin and defoamer, and disperse at 1000 r / min for 10 min.

[0063] S2: Add methyl etherified amino resin and disperse at 1000r / min for 10min.

[0064] S3: Mix deionized water and film-forming aid and add them to the solution obtained in S2, and disperse them at 1000 r / min for 10 minutes.

[0065] S4: While stirring, continue to add adhesion promoter, thixotropic agent, thickener and leveling agent in sequence, and disperse at 1000r / min for 10 minutes.

[0066] S5: Slowly add a pH adjuster while stirring, and adjust the pH of the solution to 7.5 with the pH adjuster to obtain a water-based primer coating for a golf head.

[0067] Example 3

[0068] A water-based primer coating for a golf head, which is different from Example 1 in that it includes 35g of water-based hydroxy acrylic dispersion, 15g of water-based polyurethane resin, 9g of methyl etherified amino resin, 10g of film-forming aid, 16g of deionized water, 1g of thixotropic agent, 3g of adhesion promoter, 2g of pH regulator, 2g of thickener, 0.5g of leveling agent, and 0.5g of defoaming agent.

[0069] The preparation method of the water-based primer coating for golf heads comprises the following steps:

[0070] S1: Mix the water-based hydroxy acrylic dispersion, water-based polyurethane resin and defoamer, and disperse at 900 r / min for 17 minutes.

[0071] S2: Add methyl etherified amino resin and disperse at 900 r / min for 12 minutes.

[0072] S3: Mix deionized water and film-forming aid and add them to the solution obtained in S2, and disperse at 900 r / min for 13 minutes.

[0073] S4: While stirring, continue to add adhesion promoter, thixotropic agent, thickener and leveling agent in sequence, and disperse at 900r / min for 12 minutes.

[0074] S5: Slowly add a pH adjuster while stirring, and adjust the pH of the solution to 8.5 with the pH adjuster to obtain a water-based primer coating for a golf head.

[0075] Example 4

[0076] A water-based primer coating for a golf head, which is different from Example 2 in that the film-forming aid is ethyl glycolate, diethylene glycol monoethyl ether, and hydroxypivalate in a mass ratio of 1:1:1.

[0077] Example 5

[0078] A water-based primer coating for a golf head, which is different from Example 2 in that the film-forming aid is ethyl glycolate, diethylene glycol monoethyl ether, and hydroxypivalate in a mass ratio of 1:2:2.

[0079] Example 6

[0080] A water-based primer coating for a golf head, which is different from Example 5 in that ethyl glycolate is replaced by XUS 40782 in equal amounts.

[0081] Example 7

[0082] A water-based primer coating for a golf head, which is different from Example 5 in that an equal amount of diethylene glycol monoethyl ether is replaced by XUS 40782.

[0083] Example 8

[0084] A water-based primer coating for a golf head, which is different from Example 5 in that hydroxypivalate is replaced by XUS 40782 in an equal amount.

[0085] Comparative Example 1

[0086] A water-based primer coating for a golf head, which is different from Example 2 in that the content of the water-based hydroxylated acrylic dispersion is changed from 32 g to 28 g.

[0087] Comparative Example 2

[0088] A water-based primer coating for a golf head, which is different from Example 2 in that the content of the water-based hydroxylated acrylic dispersion is changed from 32 g to 37 g.

[0089] Comparative Example 3

[0090] A water-based primer coating for a golf head, which is different from Example 2 in that the content of the water-based polyurethane resin is changed from 13g to 8g.

[0091] Comparative Example 4

[0092] A water-based primer coating for a golf head, which is different from Example 2 in that the content of the water-based polyurethane resin is changed from 13 g to 17 g.

[0093] Comparative Example 5

[0094] A water-based primer coating for a golf head, which is different from Example 2 in that the content of the methyl etherified amino resin is changed from 8 g to 5 g.

[0095] Comparative Example 6

[0096] A water-based primer coating for a golf head, which is different from Example 2 in that the content of the methyl etherified amino resin is changed from 8 g to 11 g.

[0097] Comparative Example 7

[0098] A water-based primer coating for a golf head, which is different from Example 2 in that an equal amount of water-based hydroxylated acrylic dispersion is replaced by a water-based acrylic emulsion.

[0099] Comparative Example 8

[0100] A water-based primer coating for a golf head, which is different from Example 2 in that an equal amount of the water-based polyurethane resin is replaced by a water-based epoxy curing agent.

[0101] Comparative Example 9

[0102] A water-based primer coating for a golf head, which is different from Example 2 in that an equal amount of methyl etherified amino resin is replaced by a water-based epoxy curing agent.

[0103] test

[0104] The golf heads of the above-mentioned embodiments and comparative examples were coated with water-based primer coatings on steel plate substrates that met the standards of GB / T 9271-2008 "Standard Test Plates for Paints and Varnishes" to obtain test samples.

[0105] 1. Hardness: The test refers to GB / T 6739-2006 "Paint and varnish pencil method for determination of film hardness", the coating thickness is 30μm, the load is 500g, the scratching tool is a Mitsubishi pencil, and the test is observed and rated after completion. The test results are shown in Table 1.

[0106] 2. Adhesion: The test refers to GB / T 9286-2021 "Scratch test for paints and varnishes". The coating thickness is 30μm. Use a grid knife to scratch 100 1mm*1mm small grids on the coating surface, and then use 3m tape to pull it continuously for 5 times. After the test is completed, observe and rate it. The test results are shown in Table 1.

[0107] 3. Abrasion resistance: The test is carried out according to GB / T 1768-2006 “Determination of abrasion resistance of paints and varnishes - Rotating rubber grinding wheel method”. The coating thickness is 30 μm, the load is 500 g, and the test is carried out at 1000 r. After the test, the abrasion loss (mg) is recorded. The test results are shown in Table 1.

[0108] 4. Drying time: The test refers to GB / T 1728-2020 "Determination of Drying Time of Paint Film and Putty Film". The coating thickness is 30μm. The actual drying time is determined by the cotton ball pressing method. After the test is completed, the actual drying time (min) is recorded. The test results are shown in Table 1.

[0109] Table 1:

[0110]

[0111]

[0112] In combination with Examples 1-8, Comparative Examples 1-9 and Table 1, it is not difficult to see that by selecting water-based hydroxy acrylic dispersion and water-based polyurethane resin as the main ingredients of the water-based primer coating for golf heads, and selecting methyl etherified amino resin as the curing agent for the water-based primer coating for golf heads, the synergistic effect of the three can make the prepared water-based primer coating for golf heads have good hardness, adhesion and wear resistance.

[0113] Combined with Example 2, Comparative Examples 7-9 and Table 1, it is not difficult to see that only by selecting water-based hydroxy acrylic dispersion and water-based polyurethane resin as the main ingredients of water-based primer coating for golf heads, and selecting methyl etherified amino resin as the curing agent of water-based primer coating for golf heads, can a water-based primer coating for golf heads with good hardness, adhesion and wear resistance be obtained, and the selection of water-based hydroxy acrylic dispersion, water-based polyurethane resin and methyl etherified amino resin has particularity. Further, combined with Example 2, Comparative Examples 1-6 and Table 1, it is not difficult to see that with 30 to 35 parts of water-based hydroxy acrylic dispersion and 10 to 15 parts of water-based polyurethane resin as the main ingredients of water-based primer coating, and 7 to 9 parts of methyl etherified amino resin as the curing agent, under this specific range of use, water-based hydroxy acrylic dispersion, water-based polyurethane resin and methyl etherified amino resin can cooperate and interact with each other to obtain a water-based primer coating for golf heads with good hardness, adhesion and wear resistance. Specifically, this is because under this specific range of selection, water-based hydroxy acrylic dispersion and water-based polyurethane resin can During the curing process of the waterborne primer coating, the self-condensation reaction of the methyl ether amino resin is effectively suppressed, and the three are fully cross-linked to form a dense macromolecular network structure on the golf head. At the same time, the reaction of the waterborne hydroxy acrylic dispersion, the waterborne polyurethane resin and the methyl ether amino resin further promotes the cross-linking reaction between the components of the waterborne primer coating for the golf head, making the reaction between the components of the waterborne primer coating for the golf head more thorough, extending the chain on the basis of the dense macromolecular network structure to form more molecular branches, thereby externally demonstrating the good hardness, adhesion and wear resistance of the waterborne primer coating for the golf head.

[0114] In combination with Example 2, Example 4-5, Example 6-8 and Table 1, it is not difficult to see that the selection of ethyl glycolate, diethylene glycol monoethyl ether and hydroxypivalate as film-forming aids for the aqueous primer coating for golf heads can obtain an aqueous primer coating for golf heads with a faster drying speed. Specifically, the selection of ethyl glycolate, diethylene glycol monoethyl ether and hydroxypivalate is particular. Adding ethyl glycolate, diethylene glycol monoethyl ether and hydroxypivalate to the aqueous primer coating for golf heads can further increase the reaction speed of each component of the aqueous primer coating for golf heads, promote the rapid solidification of the aqueous primer coating for golf heads into a film, thereby externally showing a faster drying speed.

[0115] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A water-based primer coating for a golf head, characterized in that: The invention comprises the following components in parts by weight: 30-35 parts of waterborne hydroxy acrylic dispersion, 10-15 parts of waterborne polyurethane resin, 7-9 parts of methyl etherified amino resin, 7-10 parts of film-forming aid, 8-16 parts of deionized water, 0.1-1 parts of thixotropic agent, 0.5-3 parts of adhesion promoter, 0.1-2 parts of pH regulator, 0.1-2 parts of thickener, 0.1-0.5 parts of leveling agent, and 0.1-0.5 parts of defoaming agent; The film-forming aid is composed of ethyl glycolate, diethylene glycol monoethyl ether and hydroxypivalate; The mass ratio of ethyl glycolate, diethylene glycol monoethyl ether and hydroxypivalate is 1:(1-2):(1-2).

2. The water-based primer coating for a golf head according to claim 1, characterized in that: The thixotropic agent is a waterborne polyurethane thixotropic agent.

3. The water-based primer coating for a golf head according to claim 1, characterized in that: The adhesion promoter is an alkoxysilane containing an amino functional group.

4. The water-based primer coating for a golf head according to claim 1, characterized in that: The thickener is one or more of a polyurethane thickener and an alkali swelling thickener.

5. The water-based primer coating for golf heads and the preparation method thereof according to claim 1, characterized in that: The leveling agent is an organic silicon surfactant leveling agent.

6. The water-based primer coating for a golf head according to claim 1, characterized in that: The defoamer is BYK-012.

7. A method for preparing a water-based primer coating for a golf head as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Mix the water-based hydroxy acrylic dispersion, water-based polyurethane resin and defoamer, and stir to disperse them evenly; S2: Add methyl etherified amino resin and stir to disperse evenly; S3: Mix deionized water and film-forming aid and add them to the solution obtained in S2, and continue stirring until the dispersion is uniform; S4: While stirring, continue to add adhesion promoter, thixotropic agent, thickener and leveling agent in sequence, and continue stirring until they are evenly dispersed; S5: The pH of the solution is adjusted to between 7.5 and 9 using a pH adjuster to obtain a water-based primer coating for a golf head.

8. The method for preparing a water-based primer coating for a golf head according to claim 7, characterized in that: The process conditions in S1 are dispersion at 800-1000 r / min for 10-20 min; the process conditions in S2 are dispersion at 800-1000 r / min for 10-15 min; the process conditions in S3 are dispersion at 800-1000 r / min for 10-15 min; the process conditions in S4 are dispersion at 800-1000 r / min for 10-15 min.

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