UV-cured high-temperature-resistant black metal paint, coating and preparation method thereof

Abstract

The invention relates to the technical field of radiation curing materials, in particular to a UV-cured high-temperature-resistant black metal coating and a preparation method of a coating of the UV-cured high-temperature-resistant black metal coating. The coating comprises the following raw materials in parts by weight: 30-40 parts of urethane acrylate, 50-60 parts of an acrylate monomer, 10-15 parts of a magnesium silicate salt compound and 0.1-0.5 part of carbon black, 1-3 parts of a phosphate ester compound; 1-2 parts of an acyl phosphine oxide; and 0.1 to 0.5 part of an auxiliary agent. The prepared coating has excellent high temperature resistance, good adhesive force and relatively high hardness. The preparation method of the coating is simple and convenient, VOC emission is avoided in the preparation process, pollution to the environment is avoided, meanwhile, the operation risk is reduced, and the coating has the remarkable environment-friendly advantage and high production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of radiation curing materials, and in particular to a UV-cured high-temperature resistant black metal coating and a coating preparation method thereof. Background Art

[0002] The traditional coating curing production process is to apply water-based or solvent-based coatings to the metal surface and dry or cure them into a film by heating and curing. This production method has high process maturity and stable quality, and has always been the first choice for coatings. However, due to the restrictions of the curing rate of the heating curing coating and the space occupied by the equipment, the production efficiency cannot be further improved. In addition, the heating curing method has high energy consumption, high infrastructure costs, high operating costs, and solvent volatilization will cause environmental pollution, and a large amount of CO2 will be generated after incineration.

[0003] In order to overcome this problem, low energy, fast curing and solvent-free have become the current development direction, among which UV curing is more excellent. UV curing uses the energy of ultraviolet lamps as the excitation source for the coating curing process, so that solvent-free coatings can be instantly cured and formed into films at room temperature. Compared with traditional heating curing methods, UV curing has many advantages such as environmental protection, energy saving, high efficiency and low carbon. However, the use of coatings in high temperature environments is still one of the difficulties in the industry. At high temperatures, the coating will crack and decompose, making the adhesion of the coating almost disappear, accompanied by cracking and damage to the coating.

[0004] Therefore, it is necessary to develop a coating composition that can take into account both high temperature performance and mechanical properties to overcome the problems existing in the prior art. Summary of the invention

[0005] In view of the above problems, the present invention provides a UV-curable high-temperature-resistant black metal coating and a coating preparation method thereof.

[0006] The UV-cured high-temperature-resistant black metal coating of the present invention adopts UV curing technology, has no VOC emissions, and the prepared coating has excellent high-temperature resistance, good adhesion and high hardness.

[0007] The first aspect of the present application is to provide a UV curable high temperature resistant black metal coating composition, characterized in that it comprises the following raw materials in parts by weight:

[0008]

[0009]

[0010] Furthermore, the magnesium silicate compound is selected from one or a combination of talc, kaolin and sericite.

[0011] Furthermore, the average particle size of the magnesium silicate compound is 1-2 μm; and the particle morphology is a layered structure.

[0012] Furthermore, the acrylate monomer is a mixture of a monofunctional (meth)acrylate monomer and a difunctional or polyfunctional (meth)acrylate monomer.

[0013] Furthermore, in the mixture, the proportion of monofunctional (meth)acrylate monomers is 70% to 85%, and the proportion of difunctional or multifunctional (meth)acrylate monomers is 15% to 30%.

[0014] In some embodiments of the present invention, the monofunctional (meth)acrylate monomer is selected from at least one of 2-phenoxyethyl acrylate and isobornyl acrylate;

[0015] In some embodiments of the present invention, the difunctional or multifunctional (meth)acrylate monomer is at least one of pentaerythritol triacrylate, trimethylolpropane triacrylate, and dipentaerythritol hexaacrylate.

[0016] Furthermore, the auxiliary agent includes but is not limited to at least one of a dispersant, a leveling agent, and a defoaming agent;

[0017] In some embodiments of the present invention, the auxiliary agent is a dispersant, preferably BYK168;

[0018] Furthermore, the polyurethane acrylate is a polyurethane acrylate containing 1-3 photosensitive groups. The photosensitive group is a (meth)acrylate group; preferably, the polyurethane acrylate is selected from one or more of CN966 and CN704 produced by Arkema and DR-U096 produced by Changxing Materials Company.

[0019] Furthermore, the phosphate compound is a methacrylated phosphate functional monomer; preferably, the phosphate compound is selected from CD9051 produced by Arkema.

[0020] Furthermore, the average particle size of the carbon black is 100-500nm.

[0021] The second aspect of the present application is to provide a method for preparing the coating composition, which comprises using a high-speed disperser to uniformly mix the raw materials of each component.

[0022] In some embodiments of the present invention, after all components are mixed, mixing is performed at 2600 rpm for 5 minutes.

[0023] The third aspect of the present application is to provide a method for preparing a high temperature resistant metal coating, wherein the coating composition described above is formed into a wet film with a thickness of 40-60 μm, and then cured under UV irradiation.

[0024] In some embodiments of the present invention, the UV curing energy is 6000 mJ / cm 2 .

[0025] Beneficial Effects

[0026] The beneficial effects of the present application are: the UV-cured high-temperature resistant ferrous metal coating provided in the present application has an excellent high-temperature resistance, good adhesion and high hardness; the adhesion reaches level 0, the hardness is above H, and the coating remains in good condition after baking at 400°C for 30 minutes.

[0027] The UV-cured high-temperature-resistant ferrous metal coating provided in the present application has a simple preparation method, no VOC emissions during the preparation process, thus avoiding environmental pollution and reducing operational risks, and has significant environmental advantages and faster production efficiency. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0029] Performance testing method:

[0030] (1) High temperature resistance test

[0031] Testing equipment: high temperature oven;

[0032] Test method: Place the prepared sample in a 400℃ oven, bake for 30 minutes, and then observe the coating condition

[0033] Performance indicators: coating is in good condition;

[0034] (2) Adhesion test

[0035] Testing equipment: grid board, tape;

[0036] Test method: Use a grid board to evenly score the prepared sample, then stick the tape on the grid and tear it off quickly;

[0037] Performance index: Level 0.

[0038] (3) Hardness test

[0039] Testing instrument: pencil hardness tester;

[0040] Test method: Use a pencil to test the hardness of the prepared sample;

[0041] Performance index: hardness is above H;

[0042] The present invention is described in detail below. The raw materials and the amounts of raw materials used in each example are shown in Table 1.

[0043] Table 1 Proportions of resin compositions in Examples and Comparative Examples

[0044]

[0045] Example 1

[0046] Preparation of UV-cured high temperature resistant black metal coatings:

[0047] 30 parts of polyurethane acrylate (CN966), 10 parts of magnesium silicate compounds (talcum powder), 50 parts of acrylate monomers (including 35 parts of 2-phenoxyethyl acrylate and 15 parts of pentaerythritol triacrylate), 0.1 parts of carbon black, 1 part of phosphate compounds (CD9051), 1 part of acylphosphine oxide (819), and 0.1 parts of auxiliary agent (BYK168) were mixed uniformly by a high-speed disperser at a speed of 2600 rpm for 5 minutes to obtain the UV-cured high-temperature resistant black metal coating; and the obtained coating was coated on a metal substrate such as low carbon steel by a frame-type film applicator, and the UV curing energy was 6000 mJ / cm 2 , the film thickness is 40-60μm.

[0048] Example 2

[0049] Preparation of UV-cured high temperature resistant black metal coatings:

[0050] 35 parts of polyurethane acrylate (DR-U096), 12 parts of magnesium silicate compound (kaolin), 55 parts of acrylate monomer (including 44 parts of 2-phenoxyethyl acrylate, 11 parts of trimethylolpropane triacrylate), 0.1 parts of carbon black, 1 part of phosphate compound (CD9051), 1 part of acylphosphine oxide (819), and 0.1 parts of auxiliary agent (BYK168) were mixed uniformly by a high-speed disperser at a speed of 2600 rpm for 5 minutes to obtain the UV-cured high-temperature resistant black metal coating; and the obtained coating was coated on a metal substrate such as low carbon steel by a frame-type film applicator, and the UV curing energy was 6000 mJ / cm 2 , the film thickness is 40-60μm.

[0051] Example 3

[0052] Preparation of high temperature resistant black metal coatings by electric UV curing:

[0053] A high-speed disperser is used to uniformly mix 40 parts of polyurethane acrylate (CN704), 15 parts of magnesium silicate compounds (sericite), 60 parts of acrylate monomers (including 40 parts of 2-phenoxyethyl acrylate, 11 parts of isobornyl acrylate, and 9 parts of dipentaerythritol hexaacrylate), 0.1 parts of carbon black, 1 part of phosphate compounds (CD9051), 1 part of acylphosphine oxide (819), and 0.1 parts of auxiliary agents (BYK168) at a speed of 2600 rpm for 5 minutes to obtain the UV-cured high-temperature resistant black metal coating; a frame-type film applicator is used to coat the obtained coating on a metal substrate such as low-carbon steel, and the UV curing energy is 6000 mJ / cm 2 , the film thickness is 40-60μm.

[0054] Comparative Example 1

[0055] Preparation of UV-cured high temperature resistant black metal coatings:

[0056] 30 parts of polyurethane acrylate (CN966), 0 parts of magnesium silicate compound (talcum powder), 50 parts of acrylate monomer (35 parts of 2-phenoxyethyl acrylate, 15 parts of pentaerythritol triacrylate), 0.1 parts of carbon black, 1 part of phosphate compound (CD9051), 1 part of acylphosphine oxide (819), and 0.1 parts of auxiliary agent (BYK168) were mixed uniformly by a high-speed disperser at a speed of 2600 rpm for 5 minutes to obtain the UV-cured high-temperature resistant black metal coating; and the obtained coating was coated on a metal substrate such as low carbon steel by a frame-type film applicator, and the UV curing energy was 6000 mJ / cm 2 , the film thickness is 40-60μm.

[0057] Comparative Example 2

[0058] Preparation of UV-cured high temperature resistant black metal coatings:

[0059] 30 parts of polyurethane acrylate (CN966), 10 parts of magnesium silicate compounds (talcum powder), 50 parts of acrylate monomers (30 parts of 2-phenoxyethyl acrylate, 20 parts of isobornyl acrylate), 0.1 parts of carbon black, 1 part of phosphate compounds (CD9051), 1 part of acylphosphine oxide (819), and 0.1 parts of auxiliary agent (BYK168) were mixed uniformly by a high-speed disperser at a speed of 2600 rpm for 5 minutes to obtain the UV-curable high-temperature resistant black metal coating; the obtained coating was then coated on a metal substrate such as low carbon steel by a frame-type film applicator, and the UV curing energy was 6000 mJ / cm 2 , the film thickness is 40-60μm.

[0060] Performance test results:

[0061] The coatings obtained in Examples 1-3 of the present invention and Comparative Examples 1-2 were tested for high temperature resistance, adhesion and hardness. The test results are shown in Table 2.

[0062] Table 2 Proportions of resin compositions in Examples and Comparative Examples

[0063] Test Results High temperature resistance Adhesion hardness Example 1 good Level 0 H Example 2 good Level 0 H Example 3 good Level 0 H Comparative Example 1 burst Level 0 H Comparative Example 2 good Level 0 HB

[0064] From the test results in Table 2, we can see that:

[0065] The coatings prepared in Examples 1 to 3 of the present invention all have excellent high temperature resistance, good adhesion and high hardness, and have the advantages of room temperature coating, no VOC emissions in the preparation process, energy saving and environmental protection, and high production efficiency.

[0066] The coatings prepared in Comparative Examples 1-2 all failed to meet the requirements, and the coating prepared in Comparative Example 1 had good adhesion and high hardness, but poor high temperature resistance. The reason is that no magnesium silicate compound was added, which failed to improve the high temperature resistance and failed to meet the use requirements of the coating.

[0067] The hardness of Comparative Example 2 does not meet the standard because the acrylic ester monomers are all monofunctional monomers, the cross-linking density is insufficient, and the hardness resistance is poor, thus failing to meet the use requirements of the coating.

[0068] The present invention is based on UV curing technology, and the thermal expansion coefficient of the coating is regulated by the selected magnesium silicate compounds to achieve excellent high temperature resistance. The balance between hardness and adhesion is achieved by the selected monofunctional and polyfunctional acrylate compounds to regulate the appropriate crosslinking density. The effect of magnesium silicate compounds added into the coating system on the mechanical properties of the formed coating, especially the hardness, is overcome. The prepared coating has excellent high temperature resistance, good adhesion and high hardness.

[0069] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A UV-curable high temperature resistant black metal coating composition, characterized in that: The invention comprises the following raw materials in parts by weight:

2. The UV-curable high temperature resistant black metal coating composition according to claim 1, characterized in that: The magnesium silicate compound is selected from one or a combination of talc, kaolin and sericite.

3. The UV-curable high temperature resistant black metal coating composition according to claim 2, characterized in that: The average particle size of the magnesium silicate compound is 1-2 μm; the particle morphology is a layered structure.

4. The UV curable high temperature resistant black metal coating composition according to claim 1, characterized in that: The acrylate monomer is a mixture of a monofunctional (meth)acrylate monomer and a difunctional or multifunctional (meth)acrylate monomer.

5. The UV-curable high temperature resistant black metal coating composition according to claim 4, characterized in that: In the mixture, the proportion of monofunctional (meth)acrylate monomers is 70% to 85%, and the proportion of difunctional or multifunctional (meth)acrylate monomers is 15% to 30%.

6. The UV-curable high temperature resistant black metal coating composition according to claim 4, characterized in that: The monofunctional (meth)acrylate monomer is selected from at least one of 2-phenoxyethyl acrylate and isobornyl acrylate; And / or, the difunctional or multifunctional (meth)acrylate monomer is at least one of pentaerythritol triacrylate, trimethylolpropane triacrylate and dipentaerythritol hexaacrylate.

7. The UV-curable high temperature resistant black metal coating composition according to claim 1, characterized in that: The auxiliary agent includes but is not limited to at least one of a dispersant, a leveling agent, and a defoaming agent.

8. The UV curable high temperature resistant black metal coating composition according to claim 1, characterized in that: The polyurethane acrylate is a polyurethane acrylate containing 1 to 3 photosensitive groups; the photosensitive group is a (meth)acrylate group; And / or, the phosphate compound is a methacrylated phosphate functional monomer; And / or, the average particle size of the carbon black is 100-500nm.

9. The method for preparing the coating composition according to any one of claims 1 to 8, characterized in that: Use a high-speed disperser to mix the raw materials of each component evenly.

10. A method for preparing a high temperature resistant metal coating, characterized in that: The coating composition according to any one of claims 1 to 8 is formed into a wet film with a thickness of 40 to 60 μm, and then cured under UV irradiation.

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