Coating, preparation method of coating and spraying method of coating

Abstract

The invention provides a coating, a preparation method of the coating and a spraying method of the coating, and belongs to the technical field of coatings. The coating is prepared from the following raw materials in parts by weight: 40 to 60 parts of chlorinated polypropylene modified resin, 1 to 5 parts of carbon black, 2 to 4 parts of fumed silica, 20 to 25 parts of titanium dioxide, 5 to 8 parts of aluminum paste, 0.5 to 2 parts of color masterbatch, 0.5 to 1 part of flatting agent, 8 to 10 parts of acetic ether and 3 to 5 parts of butyl acetate. The coating provided by the invention is uniformly distributed on the surface of a product, the adhesive force is stable, and the reject ratio of the product is reduced; the coating is used for one-time spraying, so that the spraying procedures are reduced, the spraying efficiency is improved, and the production cost is further reduced.

Description

Technical Field

[0001] The invention relates to a coating, a coating preparation method and a coating spraying method, and belongs to the technical field of coatings. Background Art

[0002] As the speed of product iteration and update accelerates, people hope to continuously improve the production speed of products. The chassis and frame of existing lamps need to be painted on the surface, so that the chassis and frame present different color effects to achieve decorative and protective effects, thereby meeting users' needs for different colors.

[0003] However, the existing painting method for chassis and frames is a two-step method, which is to first clean the chassis and frames, spray the primer after drying, spray the topcoat after the primer is dried, and then dry the topcoat for testing and packaging. Since the primer needs to be sprayed first and then the topcoat, the painting method is complicated and inefficient; at the same time, the topcoat is sprayed on the primer, and the adhesion of the topcoat is poor, resulting in a high defective rate of the product. Therefore, the market is in urgent need of a coating that can be sprayed once to improve production efficiency and yield rate.

[0004] In view of this, it is necessary to propose a coating to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a coating, a coating preparation method and a coating spraying method to solve the technical problems of poor coating adhesion, complex spraying method and low efficiency in the prior art.

[0006] To achieve the above purpose, the present invention provides a coating, the raw materials of which are recorded by weight as 40-60 parts of chlorinated polypropylene modified resin, 1-5 parts of carbon black, 2-4 parts of fumed silica, 20-25 parts of titanium dioxide, 5-8 parts of aluminum silver paste, 0.5-2 parts of masterbatch, 0.5-1 parts of leveling agent, 8-10 parts of ethyl acetate, and 3-5 parts of butyl acetate.

[0007] As a further improvement of the present invention, the color masterbatch includes 0.2-0.8 parts of red masterbatch and 0.3-1.2 parts of yellow masterbatch, and the leveling agent includes 0.3-0.5 parts of organic silicon leveling agent and 0.2-0.5 parts of non-silicon leveling agent.

[0008] As a further improvement of the present invention, the raw materials of the coating are recorded by weight as 50 parts of chlorinated polypropylene modified resin, 2 parts of carbon black, 3 parts of fumed silica, 20 parts of titanium dioxide, 8 parts of aluminum silver paste, 1.2 parts of masterbatch, 0.8 parts of leveling agent, 10 parts of ethyl acetate, and 5 parts of butyl acetate.

[0009] As a further improvement of the present invention, the color masterbatch includes 0.7 parts of red masterbatch and 0.5 parts of yellow masterbatch, and the leveling agent includes 0.3 parts of organic silicon leveling agent and 0.5 parts of non-silicon leveling agent.

[0010] To achieve the above object, the present invention provides a method for preparing a coating, which is used to prepare the above coating, comprising:

[0011] S1, adding chlorinated polypropylene modified resin into a reactor and stirring;

[0012] S2, adding carbon black, fumed silica, titanium dioxide, aluminum silver paste and masterbatch into a reaction kettle and stirring and mixing with chlorinated polypropylene modified resin;

[0013] S3, adding an organosilicon leveling agent and a non-silicon leveling agent into the reaction kettle, stirring and mixing;

[0014] S4. Add ethyl acetate and butyl acetate into a reaction kettle, and stir and mix to obtain a coating.

[0015] As a further improvement of the present invention,

[0016] The stirring speed in S1 is 300 r / min;

[0017] In S3, the stirring speed is 3000 r / min and the stirring time is 25 min;

[0018] In S4, the stirring speed is 3000 r / min and the stirring time is 5 min.

[0019] As a further improvement of the present invention, the method further comprises: S5, filtering the coating through a 200-mesh filter and then packaging the coating.

[0020] To achieve the above object, the present invention also provides a spraying method, using the above-mentioned coating, comprising:

[0021] a. Pre-treat the products to be sprayed;

[0022] b. Spray the paint on the pre-treated product to be sprayed;

[0023] c. Bake the product sprayed with the coating to obtain the finished product.

[0024] As a further improvement of the present invention, in step a, the pretreatment includes degreasing, dust removal and preheating the surface of the product to be sprayed, wherein the preheating temperature is 50-55° C. and the preheating time is 2-4 minutes.

[0025] As a further improvement of the present invention, in step b, a spray gun is used to spray the coating, the air pressure of the spray gun is 0.3-0.6Mpa, and the distance between the spray gun and the product is 250-300mm;

[0026] In step c, the product is baked in an oven at a temperature of 75-80° C. for 25-30 minutes.

[0027] The beneficial effects of the present invention are: the coating of the present invention is evenly distributed on the product surface, has stable adhesion, and reduces the defective rate of the product; by using the coating for one spraying, the spraying process is reduced, the spraying efficiency is improved, and the production cost is further reduced. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below in conjunction with specific embodiments.

[0029] The invention discloses a coating which is sprayed on the surface of a product to protect the product and change the color of the surface of the product to improve the user's satisfaction. Specifically, the raw materials of the coating are 40-60 parts by weight of chlorinated polypropylene modified resin, 3-9 parts by weight of filler, 25.5-35 parts by weight of pigment, 0.5-1 parts by weight of leveling agent, and 11-15 parts by weight of cosolvent.

[0030] The filler includes 1-5 parts of carbon black and 2-4 parts of fumed silica.

[0031] The pigment includes 20-25 parts of titanium dioxide, 5-8 parts of aluminum silver paste and 0.5-2 parts of masterbatch; the masterbatch includes 0.2-0.8 parts of red masterbatch and 0.3-1.2 parts of yellow masterbatch.

[0032] The leveling agent includes 0.3-0.5 parts of an organic silicon leveling agent and 0.2-0.5 parts of a non-silicon leveling agent.

[0033] The co-solvent includes 8-10 parts of ethyl acetate and 3-5 parts of butyl acetate.

[0034] In the present invention, in order to achieve a specific color effect, the titanium dioxide in the pigment is set to 20-25 parts, the aluminum silver paste is set to 5-8 parts, the red masterbatch is set to 0.2-0.8 parts and the yellow masterbatch is set to 0.3-1.2 parts. Of course, in other embodiments, the proportions of titanium dioxide, aluminum silver paste and masterbatch in the pigment can be changed accordingly, as long as the total proportion of the pigment can be between 25.5-35 parts, and there is no limitation here.

[0035] In the present invention, the chlorinated polypropylene modified resin is specifically: acrylic acid is grafted on the molecular chain of chlorinated polypropylene, that is, chlorinated polypropylene and acrylic acid react to connect acrylic acid to the molecular chain of chlorinated propylene to form the chlorinated polypropylene modified resin. Such a configuration, on the one hand, maintains the adhesion of the chlorinated polypropylene resin on the polypropylene material, and on the other hand, by introducing acrylic acid, the alcohol resistance and hardness of the chlorinated polypropylene modified resin are improved, and further enables the chlorinated polypropylene modified resin to surpass the construction performance of the chlorinated polypropylene itself.

[0036] Example 1

[0037] In this embodiment, the raw materials of the coating are, by weight, 50 parts of chlorinated polypropylene modified resin, 2 parts of carbon black, 3 parts of fumed silica, 20 parts of titanium dioxide, 8 parts of aluminum silver paste, 1.2 parts of masterbatch, 0.3 parts of silicone leveling agent, 0.5 parts of non-silicone leveling agent, 10 parts of ethyl acetate, and 5 parts of butyl acetate, wherein the masterbatch includes 0.7 parts of red masterbatch and 0.5 parts of yellow masterbatch.

[0038] Example 2

[0039] In this embodiment, the raw materials of the coating are, by weight, 40 parts of chlorinated polypropylene modified resin, 5 parts of carbon black, 4 parts of fumed silica, 25 parts of titanium dioxide, 8 parts of aluminum silver paste, 2 parts of masterbatch, 0.5 parts of silicone leveling agent, 0.5 parts of non-silicone leveling agent, 10 parts of ethyl acetate, and 5 parts of butyl acetate, wherein the masterbatch includes 0.8 parts of red masterbatch and 1.2 parts of yellow masterbatch.

[0040] Example 3

[0041] In this embodiment, the raw materials of the coating are, by weight, 60 parts of chlorinated polypropylene modified resin, 1 part of carbon black, 2 parts of fumed silica, 20 parts of titanium dioxide, 5 parts of aluminum silver paste, 0.5 parts of masterbatch, 0.3 parts of silicone leveling agent, 0.2 parts of non-silicone leveling agent, 8 parts of ethyl acetate, and 3 parts of butyl acetate, wherein the masterbatch includes 0.8 parts of red masterbatch and 1.2 parts of yellow masterbatch.

[0042] The present invention also discloses a method for preparing a coating, which is used for preparing the coating, and specifically comprises the following steps:

[0043] S1. Add chlorinated polypropylene modified resin into a reaction kettle and stir.

[0044] The stirring speed in the reactor is 300 r / min. In this embodiment, the stirring temperature and stirring time in the reactor are not limited, as long as the chlorinated polypropylene modified resin can be in a fluid state in the reactor, the stirring time and stirring temperature can be set according to actual conditions. For example, in summer when the temperature is high, the stirring time is shortened, and in winter when the temperature is low, the stirring time is extended. The stirring temperature and stirring time are not limited here.

[0045] S2. Add carbon black, fumed silica, titanium dioxide, aluminum silver paste and masterbatch into a reaction kettle and stir and mix with chlorinated polypropylene modified resin.

[0046] Specifically, after the chlorinated polypropylene modified resin in S1 is in a fluid state, carbon black, fumed silica, titanium dioxide, aluminum silver paste and masterbatch are added to the fluid chlorinated polypropylene modified resin in sequence, and stirred continuously to make the carbon black, fumed silica, titanium dioxide, aluminum silver paste and masterbatch uniformly mixed with the chlorinated polypropylene modified resin.

[0047] By adding carbon black and fumed silica, the filling effect is achieved, thereby reducing the production cost of the coating. By adding titanium dioxide, aluminum silver paste and masterbatch, the color of the coating can be adjusted according to actual conditions.

[0048] In this embodiment, in order to adjust the color of the coating on the product, titanium dioxide, aluminum silver paste and masterbatch are used. Of course, in other embodiments, titanium dioxide, aluminum silver paste and masterbatch can be replaced according to the actual color required, and the ratio between the components can be adjusted at the same time. As long as the color of the product surface can be changed when coated on the product, there is no restriction on the type and amount of pigment used.

[0049] S3. Add the organosilicon leveling agent and the non-silicon leveling agent into the reaction kettle and stir to mix.

[0050] The stirring speed in the reactor is 3000 r / min and the stirring time is 25 min, so that the organosilicon leveling agent and the non-silicon leveling agent can be fully mixed with the product obtained in S2 in the reactor.

[0051] Specifically, by adding an organosilicon leveling agent, the coating can form a thin film on the surface, reducing the surface tension of the coating, making the coating have better fluidity and dispersibility, and at the same time, improving the flatness and glossiness of the coating surface; by adding a non-silicon leveling agent, the viscosity of the coating is increased, thereby slowing down the flow rate of the coating, improving the adhesion of the coating, and being able to improve the flatness and glossiness of the coating surface.

[0052] S4. Add ethyl acetate and butyl acetate into a reaction kettle, and stir and mix to obtain a coating.

[0053] The stirring speed in the reactor is 3000 r / min and the stirring time is 5 min, so that ethyl acetate and butyl acetate can be fully mixed with the product obtained in S3 in the reactor.

[0054] Specifically, by adding ethyl acetate, the paint is diluted, the viscosity of the paint is reduced and the drying time of the paint is controlled, so that the paint has better performance; by adding butyl acetate, the flexibility and durability of the paint are increased, and the service life of the paint is improved.

[0055] The coating preparation method also includes coating inspection and coating packaging, wherein the coating inspection includes:

[0056] Color difference detection: put part of the coating prepared in S4 into the colorimeter to test the color difference of the coating. The color difference range is △E=±1.5. If the color difference test result is not within the range, it is necessary to add the required color paste until the color difference test result is within the range, then proceed to the next test.

[0057] Viscosity test: take some coating and put it into the viscosity tester. The standard viscosity range is 120-150s. If the test result is within this range, the packaging step can be carried out.

[0058] The coating packaging includes: filtering the coating through a 200-mesh filter and then packaging it. Specifically, the coating is filtered through a 200-mesh filter and then injected into a plastic barrel to store and package the coating. Of course, in other embodiments, the density of the filter can be adjusted according to actual conditions, and a 100-mesh, 250-mesh, 300-mesh filter can be used for filtering, which is not limited here.

[0059] The present invention also discloses a coating spraying method, which is used to spray the coating on the surface of a product to change the color of the surface of the product. The specific steps include:

[0060] a. Pre-treat the products to be sprayed.

[0061] Among them, the pretreatment includes degreasing, dust removal and preheating of the surface of the sprayed product. Specifically, the degreasing step can be performed using a dust-free cloth, or isopropyl alcohol, or other solvents with degreasing effects, which are not limited here.

[0062] The dust removal step can use an electrostatic gun for dust removal, wherein the air pressure of the electrostatic gun is controlled at 0.6-1.0pa. The electrostatic gun can also be used to remove static electricity from the surface of the product to be sprayed, or a dust-free cloth can be used to wipe to remove dust on the surface of the product to be sprayed. There is no limitation here.

[0063] The preheating step uses an oven to heat the product to be sprayed, wherein the preheating temperature of the oven is 50-55° C. and the preheating time is 2-4 minutes.

[0064] b. Spray paint on the pre-treated products to be sprayed.

[0065] The process includes the steps of mixing topcoat, setting spray gun parameters, etc. Specifically, the viscosity of the topcoat is adjusted to 10-12s to avoid high viscosity, so as to facilitate spraying with a spray gun.

[0066] Use a spray gun to spray the paint evenly on the surface of the product. The parameters of the spray gun are set as follows: air pressure is 0.3-0.6Mpa, the distance between the spray gun and the product is 250-300mm, the oil volume is (50-100)g / min, and the film thickness is set to 10-15μm / layer.

[0067] c. Bake the product sprayed with the coating to obtain the finished product.

[0068] The product is baked in an oven at a temperature of 75-80°C for 25-30 minutes, so that the coating is fixed on the surface of the sprayed product and deposited on the surface of the product to improve the adhesion between the coating and the product.

[0069] The coating proposed in Example 1 was prepared by the above coating preparation method, and the coating was sprayed on the base and frame of the lamp by the above spraying method, and different spraying conditions were set, such as: different amounts of sprayed coating, different coating thicknesses after spraying, different baking temperatures, etc., to obtain several finished products, and the several finished products were tested for adhesion, alcohol wear resistance and rubber wear resistance. At the same time, traditional primer and topcoat were used, and sprayed by a two-step method, and the spraying conditions were the same as the above spraying conditions for comparative testing.

[0070] Specifically, the test items include adhesion test, alcohol abrasion test and pencil abrasion test. The relevant parameters of adhesion test are: 100-grid test, 1mm*1mm, 3M600 adhesive tape vertically sticking and pulling. If the grade after the test is 5B, the adhesion test of the product is OK; if the grade after the test cannot reach 5B, the adhesion test of the product is NG. For details, please refer to the national standard GB9286-98 "100-grid test standard".

[0071] The relevant parameters of the alcohol abrasion test are: use a dust-free cloth / gauze dipped in alcohol, and load a weight of 500gf on the dust-free cloth / gauze. If the dust-free cloth / gauze wipes the surface of the product sprayed with paint back and forth 50 times without revealing the bottom, the alcohol abrasion test of the product is OK; if the dust-free cloth / gauze wipes the surface of the product sprayed with paint back and forth 50 times and the bottom is exposed, the alcohol abrasion test of the product is NG.

[0072] The relevant parameters of the pencil abrasion test are: Zhonghua brand pencil (specific model: plastic HB), load 500gf on the pencil, and push the pencil forward 1-2cm at a 45° angle with the paint surface, repeat the above steps in a different place, and repeat 5 times on the same product. If the paint film on the surface of the product is not broken, the pencil abrasion test of the product is OK; if the paint film on the surface of the product is damaged at one point, the pencil abrasion test of the product is NG. For details, please refer to GB / T6739-2006 "Determination of paint film hardness by pencil method for paints and varnishes".

[0073] Several finished products were prepared using traditional primer and topcoat and the traditional two-step spraying method. The test data are shown in the following table:

[0074]

[0075] The coating prepared in Example 1 was used to spray the base and frame of the lamp using the spraying method of the present invention to obtain several finished products. The test data are shown in the following table:

[0076]

[0077] From the above data, it can be seen that the best test data for the traditional two-step spraying method is: 8μm after primer, 16μm thickness of topcoat, 75℃ drying temperature, and 30min drying time.

[0078] The best test data of the spraying method of the present invention are: coating thickness 14 μm, drying temperature 75° C., and drying time 30 min.

[0079] It can be seen that compared with the traditional spraying method, under the premise of achieving the same test effect, the coating thickness of the spraying method of the present invention is smaller than that of the traditional spraying method. That is to say, the spraying method of the present invention saves more paint and helps to reduce production costs. At the same time, the spraying method of the present invention can reduce the spraying time, improve the spraying efficiency, and has a simple process and simple quality control.

[0080] In summary, the coating of the present invention is evenly distributed on the product surface and has stable adhesion, which reduces the defective rate of the product; by using the coating for one spraying, the spraying process is reduced, the spraying efficiency is improved, and the production cost is further reduced.

[0081] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A coating, characterized in that: The raw materials of the coating are recorded by weight as follows: 40-60 parts of chlorinated polypropylene modified resin, 1-5 parts of carbon black, 2-4 parts of fumed silica, 20-25 parts of titanium dioxide, 5-8 parts of aluminum silver paste, 0.5-2 parts of masterbatch, 0.5-1 parts of leveling agent, 8-10 parts of ethyl acetate and 3-5 parts of butyl acetate.

2. The coating according to claim 1, characterized in that: The color masterbatch comprises 0.2-0.8 parts of red masterbatch and 0.3-1.2 parts of yellow masterbatch, and the leveling agent comprises 0.3-0.5 parts of organic silicon leveling agent and 0.2-0.5 parts of non-silicon leveling agent.

3. The coating according to claim 1, characterized in that: The raw materials of the coating are recorded by weight as 50 parts of chlorinated polypropylene modified resin, 2 parts of carbon black, 3 parts of fumed silica, 20 parts of titanium dioxide, 8 parts of aluminum silver paste, 1.2 parts of masterbatch, 0.8 parts of leveling agent, 10 parts of ethyl acetate, and 5 parts of butyl acetate.

4. The coating according to claim 3, characterized in that: The color masterbatch includes 0.7 parts of red masterbatch and 0.5 parts of yellow masterbatch, and the leveling agent includes 0.3 parts of organic silicon leveling agent and 0.5 parts of non-silicon leveling agent.

5. A method for preparing a coating, for preparing the coating as claimed in any one of claims 1 to 4, characterized in that: include: S1, adding chlorinated polypropylene modified resin into a reactor and stirring; S2, adding carbon black, fumed silica, titanium dioxide, aluminum silver paste and masterbatch into a reaction kettle and stirring and mixing with chlorinated polypropylene modified resin; S3, adding an organosilicon leveling agent and a non-silicon leveling agent into the reaction kettle, stirring and mixing; S4. Add ethyl acetate and butyl acetate into a reaction kettle, and stir and mix to obtain a coating.

6. The preparation method according to claim 5, characterized in that: The stirring speed in S1 is 300 r / min; In S3, the stirring speed is 3000 r / min and the stirring time is 25 min; In S4, the stirring speed is 3000 r / min and the stirring time is 5 min.

7. The preparation method according to claim 5, characterized in that: Also includes: S5, filtering the coating through a 200-mesh filter and then packaging.

8. A spraying method, using the coating according to any one of claims 1 to 4, characterized in that: include: a. Pre-treat the products to be sprayed; b. Spray the paint on the pre-treated product to be sprayed; c. Bake the product sprayed with the coating to obtain the finished product.

9. The spraying method according to claim 8, characterized in that: In step a, the pretreatment includes degreasing, dust removal and preheating the surface of the product to be sprayed, wherein the preheating temperature is 50-55° C. and the preheating time is 2-4 minutes.

10. The spraying method according to claim 8, characterized in that: In step b, the paint is sprayed using a spray gun, the air pressure of the spray gun is 0.3-0.6Mpa, and the distance between the spray gun and the product is 250-300mm; In step c, the product is baked in an oven at a temperature of 75-80° C. for 25-30 minutes.

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