Acrylic resin powder coating base powder and spraying method

Abstract

The invention provides acrylic resin powder coating base powder as well as a preparation method and application thereof, and belongs to the technical field of coatings. The acrylic resin powder coating base powder comprises the following components in percentage by mass: 30-60% of an acrylic resin system and 40-70% of a polyester resin system, and the mass percentages of the acrylic resin system and the polyester resin system are controlled within the range, so that the preparation cost is reduced while the metal texture is considered; the acrylic resin system has the characteristics of high transparency, high viscosity and low softening point, and after the acrylic resin system is mixed with the metal pigment, the arrangement of the metal pigment and the appearance of metal texture are facilitated in the film forming process. However, the cost of the acrylic acid system is high at present and is 3-5 times of that of the polyester resin system, and by compounding the polyester resin system, the metal texture is ensured, and the cost is also saved.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to an acrylic resin powder coating base powder and a spraying method. Background Art

[0002] With the increasing requirements for environmental protection, paints containing solvents and VOCs are gradually being replaced by environmentally friendly paints such as powder coatings. In the process of converting paint to powder, due to the limitations of conventional powder coatings (polyester resins, polyurethane resins, polyester epoxy resins, etc.) systems (poor resin transparency, high viscosity, low fluidity, etc.), it is difficult to achieve the metallic effect and simplified texture of paint in the process of converting metallic paint to powder. In many industries such as automobiles, building materials, furniture and home appliances, and general industry, the conversion of metallic paint to powder has been slow.

[0003] Acrylic powder coatings have the advantages of acrylic resin itself in terms of viscosity, transparency, etc., so that metallic pigments (aluminum powder, pearl powder, copper powder, etc.) show excellent arrangement in the acrylic resin system, showing a strong metallic texture, which is very close to the effect of paint.

[0004] The acrylic resin powder coating base powder in the related art has the problem of high preparation cost and inability to take into account the metallic texture at the same time. Summary of the invention

[0005] In view of this, the object of the present invention is to provide an acrylic resin powder coating base powder and a spraying method. The acrylic resin powder coating base powder provided by the present invention can reduce the preparation cost while taking into account the metallic texture.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides an acrylic resin powder coating base powder, comprising the following components in percentage by mass: 30-60% of an acrylic resin system and 40-70% of a polyester resin system;

[0008] Taking the composition of the acrylic resin system as 100%, the acrylic resin system comprises the following components in mass percentage: 60-85% acrylic resin, 10-30% dodecanedioic acid, 0.5-2% leveling agent, 0.5-2% degassing agent, 0-2% antioxidant, 0-2% UV absorber and 0-20% pigment;

[0009] Taking the composition of the polyester resin system as 100%, the polyester resin system includes the following components in mass percentage: 45-90% polyester resin, 5-10% curing agent, 0.5-2% leveling agent, 0.5-2% degassing agent, 0-2% antioxidant, 0-2% UV absorber and 0-20% pigment.

[0010] Preferably, the acrylic resin includes one or more of glycidyl acrylic resin, hydroxy acrylic resin, carboxyl acrylic resin and amide type acrylic resin.

[0011] Preferably, the epoxy equivalent of the acrylic resin is 300 to 600 g / eq, the glass transition temperature is 45 to 60° C., and the softening point is 80 to 110° C.

[0012] Preferably, the pigments in the acrylic resin system and the polyester resin system independently include one or more of organic pigments, titanium white and carbon black.

[0013] Preferably, the organic pigment includes one or more of a red pigment, a green pigment and a blue pigment.

[0014] Preferably, the polyester resin in the polyester resin system comprises carboxyl polyester resin and / or hydroxyl polyester resin.

[0015] Preferably, the polyester resin system further comprises epoxy resin, and the mass percentage of the epoxy resin in the polyester resin system is 0 to 50% and is not 0.

[0016] The present invention also provides a spraying method, comprising the following steps:

[0017] The acrylic resin powder coating base powder and the metallic pigment described in the above technical solution are sprayed on the surface of the substrate in sequence and then cured.

[0018] Preferably, the metal pigment comprises one or more of aluminum powder, pearl powder and copper powder; and the mass ratio of the acrylic resin powder coating base powder to the metal pigment is 99.9:0.1 to 80:20.

[0019] The present invention also provides a spraying method, comprising the following steps:

[0020] The acrylic resin powder coating base powder and the metal pigment described in the above technical solution are bound and mixed to obtain a mixture, which is then coated on the surface of the substrate and then cured.

[0021] The invention provides an acrylic resin powder coating base powder, comprising the following components in mass percentage: 30-60% of an acrylic resin system and 40-70% of a polyester resin system; taking the composition of the acrylic resin system as 100%, the acrylic resin system comprises the following components in mass percentage: 60-85% of an acrylic resin, 10-30% of dodecanedioic acid (DDDA), 0.5-2% of a leveling agent, 0.5-2% of a degassing agent, 0-2% of an antioxidant, 0-2% of a UV absorber and 0-20% of a pigment; taking the composition of the polyester resin system as 100%, the polyester resin system comprises the following components in mass percentage: 50-90% of a polyester resin, 5-10% of a curing agent, 0.5-2% of a leveling agent, 0.5-2% of a degassing agent, 0-2% of an antioxidant, 0-2% of a UV absorber and 0-20% of a pigment.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The acrylic resin powder coating primer of the present invention comprises the following components in mass percentage: 30-60% of acrylic resin system and 40-70% of polyester resin system. Controlling the mass percentage of the acrylic resin system and the polyester resin system within this range can reduce the preparation cost while taking into account the metallic texture. The acrylic resin system uses acrylic resin as the main resin, and the performance is determined by it. Dodecanedioic acid is used as a curing agent. The polyester resin system uses polyester resin as the main resin and adds a curing agent at the same time. The acrylic resin system is characterized by high transparency, high viscosity and low softening point. After mixing with metal pigments, it is more conducive to the arrangement of metal pigments and the appearance of metallic texture in the film-forming process. However, the acrylic system currently has a high cost, which is 3-5 times that of the polyester resin system. The present invention not only ensures the embodiment of metallic texture, but also saves costs by compounding the polyester resin system.

[0024] Furthermore, the present invention also defines the epoxy equivalent, glass transition temperature (Tg) and softening point of acrylic resin, and combines various pigments (mainly organic pigments) with good transparency in acrylic resin powder coating base powder and metallic pigments (including aluminum powder, pearl powder and copper powder) in flour to show metallic textures of different colors, completing the last step of paint-to-powder conversion and solving the problem that metal powder coatings in powder coatings cannot achieve the metallic texture of paint.

[0025] The present invention also provides a spraying method, comprising the following steps: spraying the acrylic resin powder coating base powder and the metallic pigment described in the above technical solution on the surface of the substrate in sequence, and then curing (dry-to-dry method). This method can freely match the proportions, which is convenient for debugging and comparing the metal effect and cost.

[0026] The present invention also provides a binding and mixing method, comprising the following steps: binding and mixing the acrylic resin powder coating base powder and the metal pigment described in the above technical solution to obtain a mixture, coating the mixture on the surface of the substrate, and then curing. Since the acrylic resin system has a low softening point and high viscosity, it is more conducive to the binding of the metal pigment and the base powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the physical picture obtained for sequence number 4;

[0028] Figure 2 This is the physical picture obtained for sequence number 3;

[0029] Figure 3 The physical pictures obtained in Example 3 and Comparative Example 1 are as follows;

[0030] Figure 4 The physical pictures obtained in Example 4 and Comparative Example 2 are as follows;

[0031] Figure 5 This is a physical picture of Example 5 and Comparative Example 3. DETAILED DESCRIPTION

[0032] The present invention provides an acrylic resin powder coating base powder, comprising the following components in percentage by mass: 30-60% of an acrylic resin system and 40-70% of a polyester resin system;

[0033] Taking the composition of the acrylic resin system as 100%, the acrylic resin system comprises the following components in mass percentage: 60-85% acrylic resin, 10-30% dodecanedioic acid, 0.5-2% leveling agent, 0.5-2% degassing agent, 0-2% antioxidant, 0-2% UV absorber and 0-20% pigment;

[0034] Taking the composition of the polyester resin system as 100%, the polyester resin system includes the following components in mass percentage: 45-90% polyester resin, 5-10% curing agent, 0.5-2% leveling agent, 0.5-2% degassing agent, 0-2% antioxidant, 0-2% UV absorber and 0-20% pigment.

[0035] In the present invention, unless otherwise specified, the raw materials used are all commercially available products in the art.

[0036] In the present invention, the mass percentage of the acrylic resin system in the acrylic resin powder coating base powder is 30-60%, specifically 30%, 40%, 50% or 60%.

[0037] In the present invention, the mass percentage of the polyester resin system in the acrylic resin powder coating base is 40-70%, specifically 40%, 50%, 60% or 70%.

[0038] Next, the acrylic resin system of the present invention is described.

[0039] Taking the composition of the acrylic resin system as 100%, the mass percentage of the acrylic resin in the acrylic resin system is preferably 65-80%, specifically 60%, 65%, 70%, 75%, 80% or 85%.

[0040] In the present invention, the acrylic resin includes one or more of glycidyl acrylic resin, hydroxy acrylic resin, carboxyl acrylic resin and amide type acrylic resin.

[0041] In the present invention, the epoxy equivalent of the acrylic resin is preferably 300 to 600 g / eq, specifically 300, 400, 500 or 600 g / eq, the glass transition temperature is preferably 45 to 60°C, specifically 45, 50, 55 or 60°C, and the softening point is preferably 80 to 110°C, specifically 80, 90, 100 or 110°C.

[0042] In a specific embodiment of the present invention, the acrylic resin is DIC's A254 type GMA acrylic resin.

[0043] Taking the composition of the acrylic resin system as 100%, the mass percentage of dodecanedioic acid (curing agent) in the acrylic resin system is preferably 15-25%, specifically 10%, 15%, 20%, 25% or 30%.

[0044] Taking the composition of the acrylic resin system as 100%, the mass percentage of the leveling agent in the acrylic resin system is preferably 1-1.5%, specifically 0.5%, 1%, 1.5% or 20%.

[0045] In the present invention, the leveling agent preferably includes one or more of PL-200, GLP588, 486CFL and P67.

[0046] Taking the composition of the acrylic resin system as 100%, the mass percentage of the degassing agent in the acrylic resin system is preferably 1-1.5%, specifically 0.5%, 1%, 1.5% or 20%.

[0047] In the present invention, the degassing agent preferably includes American Troy powder coating defoamer 542DG and / or crystalline benzoin.

[0048] Taking the composition of the acrylic resin system as 100%, the mass percentage of the antioxidant in the acrylic resin system is preferably 0.5-1.5%, specifically 0%, 0.5%, 1%, 1.5% or 20%.

[0049] In the present invention, the antioxidant preferably includes one or more of antioxidant 626 , antioxidant 1076 , antioxidant 622 and antioxidant 405 .

[0050] Taking the composition of the acrylic resin system as 100%, the mass percentage of the UV absorber in the acrylic resin system is preferably 1-1.5%, specifically 0.5%, 1%, 1.5% or 20%.

[0051] In the present invention, the UV absorber preferably includes one or more of the UV absorber 405 and / or the UV absorber 622 .

[0052] Taking the composition of the acrylic resin system as 100%, the mass percentage of the pigment in the acrylic resin system is preferably 5-15%, specifically 0%, 5%, 10%, 15% or 20%.

[0053] In the present invention, the pigment preferably includes one or more of an organic pigment, titanium white and carbon black, and the organic pigment preferably includes one or more of a red pigment, a green pigment and a blue pigment. In a specific embodiment of the present invention, the red pigment is preferably Pigment Red 177, the green pigment is preferably Pigment Green G36, and the blue pigment is preferably Pigment Blue 6010R.

[0054] The polyester resin system of the present invention is described below.

[0055] Taking the composition of the polyester resin system as 100%, the mass percentage of the polyester resin in the polyester resin system is preferably 50-85%, specifically 45%, 50%, 60%, 70%, 80% or 90%.

[0056] In the present invention, the polyester resin in the polyester resin system preferably includes carboxyl polyester resin and / or hydroxyl polyester resin. In a specific embodiment of the present invention, the polyester resin is a TGIC polyester resin or a polyester resin for indoor 5:5 pure polyester powder coatings.

[0057] Taking the composition of the polyester resin system as 100%, the mass percentage of the curing agent in the polyester resin system may specifically be 5%, 6%, 7%, 8%, 9% or 10%.

[0058] In the present invention, the curing agent is preferably a TGIC curing agent.

[0059] Taking the composition of the acrylic resin system as 100%, the mass percentage of the leveling agent in the acrylic resin system is preferably 1-1.5%, specifically 0.5%, 1%, 1.5% or 20%.

[0060] In the present invention, the leveling agent preferably includes one or more of PL-200, GLP588, 486CFL and P67.

[0061] Taking the composition of the polyester resin system as 100%, the mass percentage of the degassing agent in the polyester resin system is preferably 1-1.5%, specifically 0.5%, 1%, 1.5% or 20%.

[0062] Taking the composition of the polyester resin system as 100%, the mass percentage of the antioxidant in the polyester resin system is preferably 0.5-1.5%, specifically 0%, 0.5%, 1%, 1.5% or 20%.

[0063] Taking the composition of the polyester resin system as 100%, the mass percentage of the UV absorber in the polyester resin system is preferably 1-1.5%, specifically 0.5%, 1%, 1.5% or 20%.

[0064] Taking the composition of the polyester resin system as 100%, the mass percentage of the pigment in the polyester resin system is preferably 5-15%, specifically 0%, 5%, 10%, 15% or 20%.

[0065] In the present invention, the types of the leveling agent, degassing agent, antioxidant, UV absorber and pigment in the polyester resin system are preferably consistent with those in the acrylic resin system, and will not be described in detail herein.

[0066] In the present invention, the polyester resin system preferably also includes an epoxy resin (referred to as a polyester-epoxy resin system in this case), and the mass percentage of the epoxy resin in the polyester-epoxy resin system is preferably 0-50% and not 0, more preferably 5-45%, specifically 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% / 50%.

[0067] In the present invention, the epoxy resin is preferably one or more of epoxy resin E12, epoxy resin 903H and epoxy resin 902H; the epoxy resin functions to cure and crosslink with the polyester resin.

[0068] The present invention has no particular limitation on the preparation method of the acrylic resin powder coating primer, and any preparation method of the composition well known to those skilled in the art may be adopted.

[0069] The present invention also provides a spraying method, comprising the following steps:

[0070] The acrylic resin powder coating base powder and the metallic pigment described in the above technical solution are sprayed on the surface of the substrate in sequence and then cured.

[0071] In the present invention, the material of the substrate is preferably a metal substrate, a composite material or wood, and the metal substrate is preferably an aluminum plate.

[0072] In the present invention, the metal pigment preferably includes one or more of aluminum powder, pearl powder and copper powder; the mass ratio of the acrylic resin powder coating base powder to the metal pigment is preferably 99.9:0.1 to 80:20.

[0073] In the present invention, the particle size of the metal pigment is preferably 10 to 100 μm.

[0074] In the present invention, the aluminum powder is preferably aluminum powder PCR 212 or aluminum powder POWDAL 8550 (available from Schlenk).

[0075] In the present invention, the curing temperature is preferably 160-190° C., specifically 160, 170, 180 or 190° C., and the curing time is preferably 10-15 min.

[0076] The present invention also provides another spraying method, comprising the following steps:

[0077] The acrylic resin powder coating base powder and the metal pigment described in the above technical solution are bound and mixed to obtain a mixture, which is then coated on the surface of the substrate and then cured.

[0078] In the present invention, the binding mixing parameters preferably include: a temperature of 50-70° C. (specifically, 50, 60 or 70° C.), and a mixing line speed of 10-30 m / s (specifically, 10, 20 or 30 m / s).

[0079] In the present invention, the curing temperature and time are preferably consistent with the above scheme, which will not be described in detail here.

[0080] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0081] The raw materials used in the embodiments of the present invention include:

[0082] The acrylic resin is DIC's A254 GMA acrylic resin (glycidyl methacrylate), with an epoxy equivalent of 515-555 g / eq, a glass transition temperature of 49°C, a softening point of 95°C, a leveling agent of PL-200, a degassing agent of American Troy powder coating defoamer 542DG, an antioxidant of antioxidant 626, a UV absorber of 405, a red pigment of pigment red 177, a green pigment of pigment green G36, and a blue pigment of pigment blue 6010R ， The polyester resin is TGIC polyester resin, and the epoxy resin is epoxy resin E12.

[0083] Test method:

[0084] 1. Leveling: Compare with the American ACT PCI standard leveling plate, there are 10 plates in total, and the best is 10 levels. 1 to 10 levels and so on.

[0085] 2. Color transparency: spray on the mirror panel and compare visually.

[0086] 3. Color uniformity: Spray on the mirror panel and compare visually.

[0087] Example 1

[0088] The first acrylic resin system includes the following components in percentage by mass: 82% acrylic resin, 14.5% dodecanedioic acid, 1% leveling agent, 0.5% degassing agent, 1% antioxidant, and 1% UV absorber.

[0089] The polyester resin system includes the following components in percentage by mass: 89.7% polyester resin, 6.8% TGIC curing agent, 1% leveling agent, 0.5% degassing agent, 1% antioxidant, and 1% UV absorber.

[0090] According to the formula of Table 1, acrylic resin powder coating primer was prepared, and the acrylic resin powder coating primer and metal pigment of this embodiment were sprayed on the surface of the base aluminum plate in sequence. The spraying thickness of the acrylic resin powder coating primer was 60 μm, and then cured. The metal pigment was aluminum powder PCR 212, and the mass ratio of the acrylic resin powder coating primer to the metal pigment was 100:0.5. The curing conditions and test results are shown in Table 1. It can be seen from Table 1 that when the addition amount of the acrylic system is less than or equal to 20%, the advantages of the overall acrylic system cannot be reflected. When the addition amount of the acrylic system is greater than or equal to 30%, the advantages of the overall acrylic system begin to be reflected. When the addition amount is more than 70%, the cost advantage decreases.

[0091] Table 1 Composition of different base powders and coating test results of Example 1

[0092]

[0093]

[0094] Figure 1 This is the actual picture obtained for sequence number 4. Figure 2 This is the actual picture obtained by sequence number 3. It can be seen that, in comparison, the metallic effect of the acrylic resin powder coating base powder of the present invention is much more translucent and sparkling. In the silver flash system, the metallic texture and the angular sparkle are very prominent, the arrangement of the aluminum powder in the base powder is relatively neat, the overall surface is oily, and the aluminum powder is arranged inside the coating film. Such a metallic texture is closer to the effect of paint overcoating.

[0095] Example 2

[0096] The acrylic resin system is the same as that in Example 1, except that the polyester resin system includes epoxy resin E21. The polyester-epoxy resin system in this example includes the following components in percentage by mass: 49.25% polyester resin, 49.25% epoxy resin, 1% leveling agent, and 0.5% degassing agent.

[0097] According to the formula of Table 2, acrylic resin powder coating base powder is prepared, and the acrylic resin powder coating base powder and metal pigment of this embodiment are sprayed on the surface of the base aluminum plate in sequence. The spraying thickness of the acrylic resin powder coating base powder is 60μm, and then it is cured. The metal pigment is aluminum powder POWDAL 8550, and the mass ratio of the acrylic resin powder coating base powder to the metal pigment is 100:2. The curing conditions and test results are shown in Table 2. It can be seen from Table 2 that when the addition amount of the acrylic system is less than or equal to 20%, the advantages of the overall acrylic system cannot be reflected. When the addition amount of the acrylic system is greater than or equal to 30%, the advantages of the overall acrylic system begin to be reflected. When the addition amount is more than 70%, the cost advantage decreases.

[0098] Table 2 Composition of different base powders and coating test results of Example 2

[0099]

[0100] Example 3

[0101] The second acrylic resin system includes the following components in percentage by mass: 81.4% acrylic resin, 14.5% dodecanedioic acid, 1% leveling agent, 0.5% degassing agent, 1% antioxidant, 1% UV absorber and 0.6% pigment green G36.

[0102] The polyester resin system is the same as in Example 1.

[0103] The composition of the acrylic resin powder coating base powder is: 30% of the second acrylic resin system and 70% of the polyester resin system.

[0104] The acrylic resin powder coating base powder and the metallic pigment of this embodiment are sprayed on the surface of the base aluminum plate in sequence, the spraying thickness of the acrylic resin powder coating base powder is 60 μm, and then cured. The metallic pigment is aluminum powder PCR 212, and the mass ratio of the acrylic resin powder coating base powder to the metallic pigment is 100:2. The curing parameters and test results are shown in Table 4.

[0105] Example 4

[0106] The third acrylic resin system includes the following components in percentage by mass: acrylic resin 81.4%, dodecanedioic acid 14.5%, leveling agent 1%, degassing agent 0.5%, antioxidant 1%, UV absorber 1% and pigment blue 6010R 0.6%.

[0107] The polyester resin system is the same as in Example 1.

[0108] The composition of the acrylic resin powder coating base powder is: 30% of the second acrylic resin system and 70% of the polyester resin system.

[0109] The acrylic resin powder coating base powder and the metallic pigment of this embodiment are sprayed on the surface of the base aluminum plate in sequence, the spraying thickness of the acrylic resin powder coating base powder is 60 μm, and then cured. The metallic pigment is aluminum powder PCR 212, and the mass ratio of the acrylic resin powder coating base powder to the metallic pigment is 100:2. The curing parameters and test results are shown in Table 4.

[0110] Example 5

[0111] The fourth acrylic resin system includes the following components in percentage by mass: 81.3% acrylic resin, 14.5% dodecanedioic acid, 1% leveling agent, 0.5% degassing agent, 1% antioxidant, 1% UV absorber and 0.7% pigment red 177.

[0112] The polyester resin system is the same as in Example 1.

[0113] The composition of the acrylic resin powder coating base powder is: 30% of the second acrylic resin system and 70% of the polyester resin system.

[0114] The acrylic resin powder coating base powder and the metallic pigment of this embodiment are sprayed on the surface of the base aluminum plate in sequence, the spraying thickness of the acrylic resin powder coating base powder is 60 μm, and then cured. The metallic pigment is aluminum powder PCR 212, and the mass ratio of the acrylic resin powder coating base powder to the metallic pigment is 100:2. The curing parameters and test results are shown in Table 4.

[0115] Comparative Example 1

[0116] The polyester resin base powder specifically comprises: 89.1% polyester resin, 6.8% TGIC curing agent, 1% leveling agent, 0.5% degassing agent, 1% antioxidant, 1% UV absorber and 0.6% pigment green G36.

[0117] The polyester resin base powder and the metal pigment of this comparative example are sprayed on the surface of the base aluminum plate in sequence, the spraying thickness of the polyester resin base powder is 60 μm, and then cured. The metal pigment is aluminum powder PCR 212, and the mass ratio of the base powder to the metal pigment is 100:2. The curing parameters and test results are shown in Table 4.

[0118] Comparative Example 2

[0119] Polyester resin base powder, specifically composed of: polyester resin 89.1%, TGIC curing agent 6.8%, leveling agent 1%, degassing agent 0.5%, antioxidant 1%, UV absorber 1% and pigment blue 6010R 0.6%.

[0120] The polyester resin base powder and the metal pigment of this comparative example are sprayed on the surface of the base aluminum plate in sequence, the spraying thickness of the polyester resin base powder is 60 μm, and then cured. The metal pigment is aluminum powder PCR 212, and the mass ratio of the base powder to the metal pigment is 100:2. The curing parameters and test results are shown in Table 4.

[0121] Comparative Example 3

[0122] The polyester resin base powder specifically comprises: 89.0% polyester resin, 6.8% TGIC curing agent, 1% leveling agent, 0.5% degassing agent, 1% antioxidant, 1% UV absorber and 1770.7% pigment red.

[0123] The polyester resin base powder and the metal pigment of this comparative example are sprayed on the surface of the base aluminum plate in sequence, the spraying thickness of the polyester resin base powder is 60 μm, and then cured. The metal pigment is aluminum powder PCR 212, and the mass ratio of the base powder to the metal pigment is 100:2. The curing parameters and test results are shown in Table 4.

[0124] Table 3 shows the test results of the base powders of Examples 3 to 5 and Comparative Examples 1 to 3. It can be seen from Tables 3 and 4 that the acrylic resin powder coating base powder of the present invention has no obvious color difference with the film thickness, has strong glitter, has different-angle glitter, and has good color aluminum effect.

[0125] Figure 3 The physical pictures obtained in Example 3 and Comparative Example 1 are as follows: Figure 4 The physical pictures obtained in Example 4 and Comparative Example 2 are as follows: Figure 5 The actual pictures obtained in Example 5 and Comparative Example 3 show that the acrylic resin powder coating base powder of the present invention can present a better metallic texture.

[0126] Table 3 Test results of foundation powder of Examples 3 to 5 and Comparative Examples 1 to 3

[0127]

[0128]

[0129] Table 4 Coating test results of Examples 3 to 5 and Comparative Examples 1 to 3

[0130]

[0131] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. 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, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An acrylic resin powder coating base powder, characterized in that: The invention comprises the following components in percentage by weight: 30-60% of acrylic resin system and 40-70% of polyester resin system; Taking the composition of the acrylic resin system as 100%, the acrylic resin system comprises the following components in mass percentage: 60-85% acrylic resin, 10-30% dodecanedioic acid, 0.5-2% leveling agent, 0.5-2% degassing agent, 0-2% antioxidant, 0-2% UV absorber and 0-20% pigment; Taking the composition of the polyester resin system as 100%, the polyester resin system includes the following components in mass percentage: 45-90% polyester resin, 5-10% curing agent, 0.5-2% leveling agent, 0.5-2% degassing agent, 0-2% antioxidant, 0-2% UV absorber and 0-20% pigment.

2. The acrylic resin powder coating primer according to claim 1, characterized in that: The acrylic resin includes one or more of glycidyl acrylic resin, hydroxy acrylic resin, carboxyl acrylic resin and amide type acrylic resin.

3. The acrylic resin powder coating primer according to claim 1 or 2, characterized in that: The epoxy equivalent of the acrylic resin is 300-600 g / eq, the glass transition temperature is 45-60° C., and the softening point is 80-110° C.

4. The acrylic resin powder coating primer according to claim 1, characterized in that: The pigments in the acrylic resin system and the polyester resin system independently include one or more of organic pigments, titanium white and carbon black.

5. The acrylic resin powder coating primer according to claim 4, characterized in that: The organic pigment includes one or more of a red pigment, a green pigment and a blue pigment.

6. The acrylic resin powder coating primer according to claim 1, characterized in that: The polyester resin in the polyester resin system includes carboxyl polyester resin and / or hydroxyl polyester resin.

7. The acrylic resin powder coating primer according to claim 1 or 6, characterized in that: The polyester resin system also includes epoxy resin, and the mass percentage of the epoxy resin in the polyester resin system is 0-50% and is not 0.

8. A spraying method, characterized in that: The following steps are involved: The acrylic resin powder coating primer and the metal pigment according to any one of claims 1 to 7 are sprayed on the surface of the substrate in sequence, and then cured.

9. The spraying method according to claim 8, characterized in that: The metal pigment comprises one or more of aluminum powder, pearl powder and copper powder; the mass ratio of the acrylic resin powder coating base powder to the metal pigment is 99.9:0.1-80:

20.

10. A spraying method, characterized in that: The following steps are involved: The acrylic resin powder coating base powder according to any one of claims 1 to 7 and the metal pigment are bound and mixed to obtain a mixture, the mixture is coated on the surface of a substrate, and then cured.

Images