Soft paint for electrostatic coating as well as preparation method and application of soft paint

Abstract

The invention discloses soft paint for electrostatic coating as well as a preparation method and application of the soft paint, and belongs to the technical field of paint. The ratio of the main paint to the curing agent to the diluent is 5: 1: (2-5), and the resistance of the soft paint for electrostatic coating is less than or equal to 0.7 megohm; the main paint is prepared from the following components in parts by weight: 45 to 55 parts of film-forming resin, 20 to 30 parts of mixed solvent, 2 to 4 parts of dispersing agent, 0.1 to 0.5 part of defoaming agent, 6 to 10 parts of matting powder, 1 to 3 parts of micronized wax powder / fluff powder, 0.1 to 0.5 part of flatting agent, 1 to 2 parts of hand feeling aid and 0.5 to 1 part of conductive agent. The soft paint prepared by the invention is suitable for electrostatic coating, and has the advantages of high painting rate, high efficiency, high productivity, stable quality, fine and soft paint film, comfortable hand feeling, skin feeling and smooth feeling, and good durability / after-tack resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to a soft-touch paint for electrostatic coating, and a preparation method and application thereof. Background Art

[0002] As consumers' requirements for product touch and appearance increase, soft-touch paint is increasingly used in many fields such as automobiles, home appliances, furniture, and electronic products. Especially in the high-end market, soft-touch paint is favored for its unique touch and beautiful appearance.

[0003] Electrostatic coating is a spraying technology that uses the principle of static electricity to evenly attach paint to the surface of the object being coated. During the electrostatic coating process, after the paint particles are charged, they are attracted to the grounded surface of the object being coated under the action of the electric field, thus achieving efficient and uniform coating.

[0004] However, due to the special ingredients of soft-touch paint, the uniformity of electrostatic adsorption will be affected, resulting in uneven coating, so that the performance and appearance of the coating cannot meet the requirements, the stability is poor, and the paint film will produce re-stickiness during use. Therefore, developing soft-touch paint ingredients and making its performance stable is a technical problem that needs to be solved. Summary of the invention

[0005] The purpose of the present invention is to provide a soft-touch paint for electrostatic coating and a preparation method and application thereof to solve the above-mentioned problems.

[0006] To achieve the above object, the present invention discloses a soft-touch paint for electrostatic coating, wherein the components and weight ratio of the soft-touch paint for electrostatic coating are main paint: curing agent: diluent = 5: 1: (2-5), and the resistance of the soft-touch paint for electrostatic coating is ≤ 0.7 MΩ;

[0007] The main paint includes the following components and their weight proportions: film-forming resin: 45-55 parts, mixed solvent: 20-30 parts, dispersant: 2-4 parts, defoaming agent: 0.1-0.5 parts, matting powder: 6-10 parts, micronized wax powder / velvet powder: 1-3 parts, leveling agent: 0.1-0.5 parts, feel aid: 1-2 parts and conductive agent: 0.5-1 parts.

[0008] Preferably, the film-forming resin comprises 30-40 parts by weight of a soft-touch resin low-hydroxy polyester polyol resin and 10-15 parts by weight of a hydroxy acrylic resin; the matting agent is fumed silica;

[0009] The solid content of the soft-touch resin low-hydroxy polyester polyol resin is ≥99%, the acid value is ≤5mgKOH / g, the viscosity is 12500±500mPa·s at 30°C, and the hydroxyl value is 78±5mgKOH / g; the solid content of the hydroxy acrylic resin is 60±2%, the acid value is ≤2mgKOH / g, the viscosity is 2000-4000CPS at 25°C, and the hydroxyl value is 100±10mgKOH / g.

[0010] Preferably, the curing agent includes the following components and their weight proportions: 60-70 parts of curing agent resin and 30-40 parts of mixed solvent.

[0011] Preferably, the diluent includes the following components and their weight proportions: 50-60 parts of butyl acetate, 20-30 parts of ethyl acetate and 5-10 parts of diacetone alcohol.

[0012] Preferably, the mixed solvent is one or more of butyl acetate, ethylene glycol ethyl ether acetate, ethyl ester, and ketones.

[0013] Preferably, the components in the curing agent resin and their weight ratio are HDI trimer:IPDI trimer=3:1.

[0014] The present invention also provides a method for preparing the above-mentioned soft-touch paint for electrostatic coating, comprising the following steps:

[0015] S1. Preparation of main paint: put the mixed solvent, dispersant and defoamer into a container and stir evenly, then add the film-forming resin and stir at a low speed of 200-400 rpm. Slowly add the matting powder and micronized wax powder / fluff powder during stirring to allow the powder to completely dissolve into the liquid. Gradually increase the speed to more than 1500 rpm, stir at high speed for 30 minutes, disperse until the material fineness is ≤15um, then reduce the speed to 200-400 rpm, and slowly add the leveling agent and feel additive;

[0016] S2. Preparation of curing agent: after checking that the water content in the mixed solvent is ≤500ppm, mix the mixed solvent with the curing agent resin and stir evenly at a medium speed of 400-600r / min;

[0017] S3. Evenly mix the main paint, curing agent and diluent, and add a conductive agent to adjust the resistance. The conductive agent is an alcohol solution of ammonium salt.

[0018] The soft-touch paint for electrostatic coating provided by the present invention is applied to the coating of articles.

[0019] Therefore, the present invention has the following beneficial effects:

[0020] (1) The soft-touch paint for electrostatic coating provided by the present invention has good electrostatic coating effect, high coating rate, high paint utilization rate, low spraying loss, high production efficiency, uniform paint film, good leveling property, and is suitable for industrial automated assembly line production operations;

[0021] (2) The soft-touch paint for electrostatic coating prepared by the present invention has excellent performance. After coating, the paint film is smooth, delicate and soft, with a flexible feel. It has excellent adhesion, stability, water resistance and anti-re-adhesion, and has good filling and hiding properties for defects in the base paint / substrate.

[0022] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a stirring diagram of the soft-touch paint for electrostatic coating prepared in Example 1 of the present invention;

[0024] Figure 2 This is a finished picture of the soft-touch paint for electrostatic coating prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0026] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by one having ordinary skills in the field to which the present invention belongs.

[0027] In addition, it should be understood that although this specification is described according to the implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. These other implementation modes are also covered within the protection scope of the present invention.

[0028] The invention discloses a soft-touch paint for electrostatic coating, wherein the components and weight ratio of the soft-touch paint for electrostatic coating are main paint: curing agent: diluent=5:1:(2-5), and the resistance of the soft-touch paint for electrostatic coating is ≤0.7MΩ;

[0029] The main paint includes the following components and their weight proportions: film-forming resin: 45-55 parts, mixed solvent: 20-30 parts, dispersant: 2-4 parts, defoaming agent: 0.1-0.5 parts, matting powder: 6-10 parts, micronized wax powder / velvet powder: 1-3 parts, leveling agent: 0.1-0.5 parts, feel aid: 1-2 parts and conductive agent: 0.5-1 parts.

[0030] The film-forming resin includes 30-40 parts by weight of a soft-touch resin, a low-hydroxy polyester polyol resin, and 10-15 parts by weight of a hydroxy acrylic resin; the matting agent is fumed silica;

[0031] The solid content of the soft-touch resin low-hydroxy polyester polyol resin is ≥99%, the acid value is ≤5mgKOH / g, the viscosity is 12500±500mPa·s at 30°C, and the hydroxyl value is 78±5mgKOH / g; the solid content of the hydroxy acrylic resin is 60±2%, the acid value is ≤2mgKOH / g, the viscosity is 2000-4000CPS at 25°C, and the hydroxyl value is 100±10mgKOH / g.

[0032] The curing agent comprises the following components and their weight proportions: 60-70 parts of curing agent resin and 30-40 parts of mixed solvent.

[0033] The diluent comprises the following components and their weight proportions: 50-60 parts of butyl acetate, 20-30 parts of ethyl acetate and 5-10 parts of diacetone alcohol.

[0034] The mixed solvent is one or more of butyl acetate, ethylene glycol ethyl ether acetate, ethyl ester and ketones.

[0035] The components in the curing agent resin and their weight ratio are HDI trimer:IPDI trimer=3:1.

[0036] The present invention also provides a method for preparing the above-mentioned soft-touch paint for electrostatic coating, comprising the following steps:

[0037] S1. Preparation of main paint: put the mixed solvent, dispersant and defoamer into a container and stir evenly, then add the film-forming resin and stir at a low speed of 200-400 rpm. Slowly add the matting powder and micronized wax powder / fluff powder during stirring to allow the powder to completely dissolve into the liquid. Gradually increase the speed to more than 1500 rpm, stir at high speed for 30 minutes, disperse until the material fineness is ≤15um, then reduce the speed to 200-400 rpm, and slowly add the leveling agent and feel additive;

[0038] S2. Preparation of curing agent: after checking that the water content in the mixed solvent is ≤500ppm, mix the mixed solvent with the curing agent resin and stir evenly at a medium speed of 400-600r / min;

[0039] S4. Mix the main paint, curing agent and thinner evenly, and add conductive agent to adjust the resistance.

[0040] The soft-touch paint for electrostatic coating provided by the present invention is applied to the coating of articles.

[0041] Example 1

[0042] This embodiment provides a soft-touch paint for electrostatic coating and a preparation method thereof, comprising the following steps:

[0043] S1. Preparation of main paint: by weight, 30 parts of mixed solvent, 4 parts of dispersant and 0.5 parts of defoamer are put into a container, stirred evenly, and then 35 parts of flexible hand feeling resin and 15 parts of hydroxy acrylic resin are added, and stirred at a low speed of 200-400 rpm. During the stirring process, 10 parts of matting powder and 3 parts of micronized wax powder / fluff powder are slowly added to allow the powder to completely dissolve into the liquid, and the speed is gradually increased to more than 1500 rpm, and stirred at high speed for 30 minutes to disperse the material to a fineness of ≤15um, and then the speed is reduced to 200-400 rpm, and 0.5 parts of leveling agent and 2 parts of hand feeling additive are slowly added, and stirred for another 20 minutes;

[0044] S2. Preparation of curing agent: after checking that the water content in the mixed solvent is ≤500ppm, 40 parts of the mixed solvent are mixed with 60 parts of curing agent resin, wherein the curing agent resin includes 45 parts of HDI trimer and 15 parts of IPDI trimer, and stirred evenly at a medium speed of 400-600r / min;

[0045] S3, the main paint, curing agent and diluent are mixed evenly, wherein the diluent is butyl acetate, ethyl acetate and diacetone alcohol, and finally the conductive agent BYK-ES80 is added to adjust the resistance to 0.7MΩ to obtain the soft-touch paint for electrostatic coating. The stirring diagram of the soft-touch paint for electrostatic coating is as follows: Figure 1 As shown; the finished product is shown Figure 2 shown.

[0046] Example 2

[0047] This embodiment provides a soft-touch paint for electrostatic coating and a preparation method thereof, comprising the following steps:

[0048] S1. Preparation of main paint: by weight, 25.5 parts of mixed solvent, 4 parts of dispersant and 0.5 parts of defoamer are put into a container, stirred evenly, and then 40 parts of flexible hand feeling resin and 15 parts of hydroxy acrylic resin are added, and stirred at a low speed of 200-400 rpm. During the stirring process, 10 parts of matting powder and 3 parts of micronized wax powder / fluff powder are slowly added to allow the powder to completely dissolve into the liquid, and the speed is gradually increased to more than 1500 rpm, and stirred at high speed for 30 minutes to disperse the material to a fineness of ≤15um, and then the speed is reduced to 200-400 rpm, and 0.5 parts of leveling agent and 1.5 parts of hand feeling additive are slowly added, and stirred for another 20 minutes;

[0049] S2. Preparation of curing agent: after checking that the water content in the mixed solvent is ≤500ppm, 40 parts of the mixed solvent are mixed with 60 parts of curing agent resin, wherein the curing agent resin includes 45 parts of HDI trimer and 15 parts of IPDI trimer, and stirred evenly at a medium speed of 400-600r / min;

[0050] S3. Evenly mix the main paint, curing agent and diluent, wherein the diluent is butyl acetate, ethyl acetate and diacetone alcohol, and finally add the conductive agent BYK-ES80 to adjust the resistance to 0.6 MΩ to obtain a soft-touch paint for electrostatic coating.

[0051] Example 3

[0052] This embodiment provides a soft-touch paint for electrostatic coating and a preparation method thereof, comprising the following steps:

[0053] S1. Preparation of main paint: by weight, 30 parts of mixed solvent, 4 parts of dispersant and 0.5 parts of defoamer are put into a container and stirred evenly, then 40 parts of flexible hand feeling resin and 10 parts of hydroxy acrylic resin are added, and stirred at a low speed of 200-400 rpm. During the stirring process, 10 parts of matting powder and 3 parts of micronized wax powder / fluff powder are slowly added to allow the powder to completely dissolve into the liquid, and the speed is gradually increased to more than 1500 rpm, and stirred at high speed for 30 minutes to disperse the material to a fineness of ≤15um, and then the speed is reduced to 200-400 rpm, and 0.5 parts of leveling agent and 2 parts of hand feeling additive are slowly added, and stirred for another 20 minutes;

[0054] S2. After checking that the water content in the mixed solvent is ≤500ppm, 40 parts of the mixed solvent are mixed with 60 parts of a curing agent resin, wherein the curing agent resin includes 45 parts of HDI trimer and 15 parts of IPDI trimer, and stirred at a medium speed of 400-600r / min;

[0055] S3. Evenly mix the main paint, curing agent and diluent, wherein the diluent is butyl acetate, ethyl acetate and diacetone alcohol, and finally add the conductive agent BYK-ES80 to adjust the resistance to 0.5 MΩ to obtain a soft-touch paint for electrostatic coating.

[0056] The performance test of the soft-touch paint for electrostatic coating prepared in the above Examples 1-3 was carried out, and the performance indicators were referred to GB / T23997-2020, wherein the water resistance was the test result of the soft-touch paint for electrostatic coating at 23±2°C for 168h, the anti-adhesion was the test result of the paint film exposed to the sun and rain outdoors for three months, and the storage stability was the test result of the original paint hot storage at 50°C×14d. The test results are shown in Table 1 below:

[0057] Table 1 Performance test results

[0058]

[0059]

[0060] It can be seen from the above examples that the soft-touch paint for electrostatic coating prepared by the present invention has stable performance, is suitable for electrostatic coating, has high coating rate, fast efficiency, high production capacity, stable quality, fine and soft paint film, comfortable hand feeling, skin feeling and smooth feeling, and good durability and anti-rebound property. It can be used as a coating for objects that are often touched / touched / operated by hands, such as car interiors (steering wheels, hand brakes, etc.), various home appliances (hair dryers, umbrella handles, etc.), mobile phones, racing helmets, etc.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A soft-touch paint for electrostatic coating, characterized in that: The components and weight ratio of the soft-touch paint for electrostatic coating are main paint: curing agent: diluent = 5: 1: (2-5), and the resistance of the soft-touch paint for electrostatic coating is ≤ 0.7 MΩ; The main paint includes the following components and their weight proportions: film-forming resin: 45-55 parts, mixed solvent: 20-30 parts, dispersant: 2-4 parts, defoaming agent: 0.1-0.5 parts, matting powder: 6-10 parts, micronized wax powder / velvet powder: 1-3 parts, leveling agent: 0.1-0.5 parts, feel aid: 1-2 parts and conductive agent: 0.5-1 parts.

2. The soft-touch paint for electrostatic coating according to claim 1, characterized in that: The film-forming resin includes 30-40 parts by weight of a soft-touch resin, a low-hydroxy polyester polyol resin, and 10-15 parts by weight of a hydroxy acrylic resin; the matting agent is fumed silica; The solid content of the soft-touch resin low-hydroxy polyester polyol resin is ≥99%, the acid value is ≤5mgKOH / g, the viscosity is 12500±500mPa·s at 30°C, and the hydroxyl value is 78±5mgKOH / g; the solid content of the hydroxy acrylic resin is 60±2%, the acid value is ≤2mgKOH / g, the viscosity is 2000-4000CPS at 25°C, and the hydroxyl value is 100±10mgKOH / g.

3. The soft-touch paint for electrostatic coating according to claim 1, characterized in that: The curing agent comprises the following components and their weight proportions: 60-70 parts of curing agent resin and 30-40 parts of mixed solvent.

4. The soft-touch paint for electrostatic coating according to claim 2, characterized in that: The diluent comprises the following components and their weight proportions: 50-60 parts of butyl acetate, 20-30 parts of ethyl acetate and 5-10 parts of diacetone alcohol.

5. The soft-touch paint for electrostatic coating according to claim 4, characterized in that: The mixed solvent is one or more of butyl acetate, ethylene glycol ethyl ether acetate, ethyl ester and ketones.

6. The soft-touch paint for electrostatic coating according to claim 3, characterized in that: The components in the curing agent resin and their weight ratio are HDI trimer:IPDI trimer=3:

1.

7. A method for preparing a soft-touch paint for electrostatic coating according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Preparation of main paint: put the mixed solvent, dispersant and defoamer into a container and stir evenly, then add the film-forming resin and stir at a low speed of 200-400 rpm. Slowly add the matting powder and micronized wax powder / fluff powder during stirring to allow the powder to completely dissolve into the liquid. Gradually increase the speed to more than 1500 rpm, stir at high speed for 30 minutes, disperse to the material fineness ≤15um, then reduce the speed to 200-400 rpm, and slowly add the leveling agent and feel additive. S2. Preparation of curing agent: after checking that the water content in the mixed solvent is ≤500ppm, mix the mixed solvent with the curing agent resin and stir evenly at a medium speed of 400-600r / min; S3. Evenly mix the main paint, curing agent and diluent, and add a conductive agent to adjust the resistance. The conductive agent is an alcohol solution of ammonium salt.

8. An application of the soft-touch paint for electrostatic coating according to any one of claims 1 to 6, characterized in that: The soft-touch paint for electrostatic coating is applied to the coating of articles.

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