High-adhesion photocuring coating and preparation method thereof

Abstract

The invention provides a high-adhesion photocuring coating and a preparation method thereof, and relates to the technical field of coating production. The photocuring coating is obtained by compounding a component A and a component B, coating and drying, the component A is composed of bisphenol A epoxy resin, alkyl acrylate monomers, gamma-Fe2O3 nanoparticle modified alkyd resin, organic acid modified polystyrene microspheres, a coupling agent and silica powder, and the component B is composed of deionized water, a photoinitiator and an accelerant. The defects in the prior art are overcome, the adhesion of a coating formed by the coating to a base material can be effectively improved, a certain salt mist aging resisting effect is achieved, and the performance of the coating is comprehensively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coating production, in particular to a light-curing coating with high adhesion and a preparation method thereof. Background Art

[0002] Photocuring coatings utilize ultraviolet (UV) or visible light to trigger a chemical reaction, rapidly converting liquid prepolymers into solid coatings. The key is that photoinitiators absorb light energy to generate free radicals or cations, which drive polymerization of monomers and oligomers, forming a cross-linked network. This technology is widely used in industry due to its fast curing speed (seconds to minutes), energy conservation and environmental protection (no high-temperature baking required), and excellent coating properties (high hardness, wear resistance, and chemical resistance).

[0003] One of the most important properties of photocuring coatings is their adhesion to the substrate. Adhesion mainly depends on the interaction between the coating and the substrate. Generally speaking, the operation method to improve adhesion is mostly to treat the substrate layer, and to improve the adhesion of the final coating by controlling the roughness of the substrate layer. However, in the actual production and processing process, large substrates are often directly coated on the surface after forming. The polishing of the substrate surface may cause dust to fly. If the environment of the paint layer processing space is not well treated, it is easy to cause dust residue, which will further reduce the adhesion of the paint layer. Therefore, starting from the paint itself, further improving the adhesion of the coating can significantly improve the processing convenience of the coating. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a high-adhesion photocuring coating and a preparation method thereof, which can effectively improve the adhesion of the coating formed by the coating to the substrate, and has a certain resistance to salt spray aging, thereby comprehensively improving the performance of the coating.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A photocurable coating with high adhesion, characterized in that the photocurable coating is obtained by coating and drying component A and component B in a mass ratio of 10-15:1, wherein component A is composed of the following raw materials in parts by weight: 40-60 parts of bisphenol A epoxy resin, 4-6 parts of alkyl acrylate monomer, 11-15 parts of γ-Fe2O3 nanoparticle-modified alkyd resin, 2-4 parts of organic acid-modified polystyrene microspheres, 0.6-1.2 parts of coupling agent, and 3-5 parts of silicon micropowder; and component B is composed of the following substances in parts by weight: 8-10 parts of deionized water, 8-10 parts of photoinitiator, and 1-2 parts of accelerator.

[0007] Preferably, the alkyl acrylate monomer is at least one of methyl acrylate, ethyl acrylate, and butyl acrylate.

[0008] Preferably, the preparation method of the γ-Fe2O3 nanoparticle modified alkyd resin comprises the following steps:

[0009] (1) Dispersing γ-Fe2O3 nanoparticles in clean water, adding silane coupling agent KH550, stirring evenly, and then filtering and drying to obtain surface-modified γ-Fe2O3;

[0010] (2) The surface-modified γ-Fe2O3 is added to the alkyd resin in a mass ratio of 1-2:100, and xylene is used as a solvent. The mixture is stirred thoroughly and then the solvent is removed to obtain the γ-Fe2O3 nanoparticle-modified alkyd resin.

[0011] Preferably, the particle size of the γ-Fe2O3 nanoparticles is 10-20 nm, and the rotation speed for fully stirring in step (2) is 800-1000 r / min, and the stirring time is 20-30 min.

[0012] Preferably, the preparation method of the organic acid-modified polystyrene microspheres comprises the following steps:

[0013] (1) Place polystyrene microspheres in 98% sulfuric acid solution and stir for 40-60 minutes;

[0014] (2) The polystyrene microspheres are taken out and washed until neutral, and then placed in an organic acid solution with a concentration of 20%-30%, stirred thoroughly for 2-4 hours, and then taken out and dried to obtain organic acid-modified polystyrene microspheres.

[0015] Preferably, the particle size of the polystyrene microspheres is 40-100 nm.

[0016] Preferably, the coupling agent is a silane coupling agent KH550, the photoinitiator is a mixture of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 1-hydroxycyclohexyl phenyl ketone and 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone in a mass ratio of 2:3:1; and the accelerator is at least one of dimethylethanolamine, triethanolamine, thioglycerol and thioglycolic acid.

[0017] The preparation method of the light-cured coating comprises the following steps:

[0018] S1. Preparation of component A: bisphenol A epoxy resin, alkyl acrylate monomer, γ-Fe2O3 nanoparticle-modified alkyd resin, 2-4 parts of organic acid-modified polystyrene microspheres, coupling agent, and silica powder are mixed, stirred evenly in a nitrogen atmosphere, and allowed to stand for degassing to obtain component A;

[0019] S2. Preparation of component B: Disperse the photoinitiator and accelerator in deionized water to obtain component B;

[0020] S3. When in use, mix component A and component B evenly and then apply them directly on the substrate, perform ultraviolet light curing treatment to form a light-cured coating.

[0021] Preferably, the stirring speed in step S1 is 1200-1600 r / min, and the stirring time is 5-10 min.

[0022] The present invention provides a light-cured coating with high adhesion and a preparation method thereof, which has the following advantages over the prior art:

[0023] The present invention adopts bisphenol A epoxy resin as the main base material, and comprehensively improves the adhesion effect of subsequent coatings by compounding alkyl acrylate monomers, γ-Fe2O3 nanoparticle-modified alkyd resin, organic acid-modified polystyrene microspheres and other materials, and further improves the aging resistance of the coating after formation, ensuring the stable performance of the coating in various fields. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] In the following examples, the particle size of the γ-Fe2O3 nanoparticles is 10-20 nm, the particle size of the nano-titanium dioxide is 10-20 nm, and the particle size of the polystyrene microspheres is 40-100 nm; and the photoinitiator is a mixture of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 1-hydroxycyclohexyl phenyl ketone and 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone in a mass ratio of 2:3:1.

[0026] Example:

[0027] Preparation of light-curing coatings:

[0028] (1) Preparation of γ-Fe2O3 nanoparticle modified alkyd resin:

[0029] Disperse γ-Fe2O3 nanoparticles in clean water, add silane coupling agent KH550 with the same mass as the γ-Fe2O3 nanoparticles, stir evenly, filter and dry to obtain surface-modified γ-Fe2O3;

[0030] The surface-modified γ-Fe2O3 was added to the alkyd resin at a mass ratio of 1.5:100, and xylene was used as solvent. The mixture was stirred at a speed of 800 r / min for 30 minutes, and then the solvent was removed to obtain the γ-Fe2O3 nanoparticle-modified alkyd resin.

[0031] (2) Preparation of organic acid modified polystyrene microspheres:

[0032] The polystyrene microspheres were placed in a 98% sulfuric acid solution and stirred for 50 minutes; the polystyrene microspheres were then taken out and placed in a 25% benzoic acid solution and stirred for 3 hours, and then taken out and dried to obtain organic acid-modified polystyrene microspheres.

[0033] (3) Preparation of Component A: Mix the following materials in parts by weight: 50 parts of bisphenol A epoxy resin, 5 parts of methyl acrylate, 13 parts of γ-Fe2O3 nanoparticle-modified alkyd resin, 3 parts of organic acid-modified polystyrene microspheres, 0.9 parts of silane coupling agent KH550, and 4 parts of silicon micropowder; stir the materials at a speed of 1400 r / min in a nitrogen atmosphere for 8 minutes, then let it stand for degassing to obtain Component A for later use;

[0034] (4) Preparation of Component B: Mix the following substances in parts by weight: 9 parts of deionized water, 9 parts of photoinitiator, and 1.5 parts of dimethylethanolamine to obtain Component B.

[0035] (5) When using, evenly mix component A and component B in a mass ratio of 13:1 to prepare a coating for subsequent coating.

[0036] Comparative Example 1:

[0037] Preparation of light-curing coatings:

[0038] (1) Preparation of nano-titanium dioxide modified alkyd resin:

[0039] Disperse nano-titanium dioxide in clean water, add silane coupling agent KH550 with the same mass as nano-titanium dioxide, stir evenly, filter and dry to obtain surface-modified nano-titanium dioxide;

[0040] The surface-modified nano-titanium dioxide was added to the alkyd resin at a mass ratio of 1.5:100, and xylene was used as solvent. The mixture was stirred at a speed of 800 r / min for 30 minutes, and then the solvent was removed to obtain the nano-titanium dioxide-modified alkyd resin.

[0041] (2) Preparation of organic acid modified polystyrene microspheres:

[0042] The polystyrene microspheres were placed in a 98% sulfuric acid solution and stirred for 50 minutes; the polystyrene microspheres were then taken out and placed in a 25% benzoic acid solution and stirred for 3 hours, and then taken out and dried to obtain organic acid-modified polystyrene microspheres.

[0043] (3) Preparation of Component A: Mix the following materials in parts by weight: 50 parts of bisphenol A epoxy resin, 5 parts of methyl acrylate, 13 parts of nano-titanium dioxide modified alkyd resin, 3 parts of organic acid modified polystyrene microspheres, 0.9 parts of silane coupling agent KH550, and 4 parts of silicon micropowder; stir the materials at a speed of 1400 r / min in a nitrogen atmosphere for 8 minutes, then let it stand for degassing to obtain Component A for use;

[0044] (4) Preparation of Component B: Mix the following substances in parts by weight: 9 parts of deionized water, 9 parts of photoinitiator, and 1.5 parts of dimethylethanolamine to obtain Component B.

[0045] (5) When using, evenly mix component A and component B in a mass ratio of 13:1 to prepare a coating for subsequent coating.

[0046] Comparative Example 2:

[0047] Preparation of light-curing coatings:

[0048] (1) Preparation of organic acid modified polystyrene microspheres:

[0049] The polystyrene microspheres were placed in a 98% sulfuric acid solution and stirred for 50 minutes; the polystyrene microspheres were then taken out and placed in a 25% benzoic acid solution and stirred for 3 hours, and then taken out and dried to obtain organic acid-modified polystyrene microspheres.

[0050] (2) Preparation of Component A: Mix the following materials in parts by weight: 50 parts of bisphenol A epoxy resin, 5 parts of methyl acrylate, 13 parts of alkyd resin, 3 parts of organic acid-modified polystyrene microspheres, 0.9 parts of silane coupling agent KH550, and 4 parts of silicon micropowder; stir the materials at a speed of 1400 r / min in a nitrogen atmosphere for 8 minutes, then let it stand for degassing to obtain Component A for use;

[0051] (3) Preparation of Component B: Mix the following substances in parts by weight: 9 parts of deionized water, 9 parts of photoinitiator, and 1.5 parts of dimethylethanolamine to obtain Component B.

[0052] (4) When using, evenly mix component A and component B in a mass ratio of 13:1 to prepare a coating for subsequent coating.

[0053] Comparative Example 3:

[0054] Preparation of light-curing coatings:

[0055] (1) Preparation of γ-Fe2O3 nanoparticle modified alkyd resin:

[0056] Disperse γ-Fe2O3 nanoparticles in clean water, add silane coupling agent KH550 with the same mass as the γ-Fe2O3 nanoparticles, stir evenly, filter and dry to obtain surface-modified γ-Fe2O3;

[0057] The surface-modified γ-Fe2O3 was added to the alkyd resin at a mass ratio of 1.5:100, and xylene was used as solvent. The mixture was stirred at a speed of 800 r / min for 30 minutes, and then the solvent was removed to obtain the γ-Fe2O3 nanoparticle-modified alkyd resin.

[0058] (2) Preparation of Component A: Mix the following materials in parts by weight: 50 parts of bisphenol A epoxy resin, 5 parts of methyl acrylate, 13 parts of γ-Fe2O3 nanoparticle-modified alkyd resin, 3 parts of polystyrene microspheres, 0.9 parts of silane coupling agent KH550, and 4 parts of silicon micropowder; stir the materials at a speed of 1400 r / min in a nitrogen atmosphere for 8 minutes, then let it stand for degassing to obtain Component A for use;

[0059] (3) Preparation of Component B: Mix the following substances in parts by weight: 9 parts of deionized water, 9 parts of photoinitiator, and 1.5 parts of dimethylethanolamine to obtain Component B.

[0060] (4) When using, evenly mix component A and component B in a mass ratio of 13:1 to prepare a coating for subsequent coating.

[0061] Detection:

[0062] To test the adhesion effect of the coatings prepared in the above examples and comparative examples 1-3, a steel plate of the same specification was used as the coating substrate. After cleaning with ethanol, the surface was dried at 60°C. The coatings of the above examples and comparative examples 1-3 (25 g / m2) were then coated on the steel plate surface. 2 ), after standing for 20 minutes, use ultraviolet light to cure until completely cured;

[0063] Artificial salt spray aging tests were conducted at 35±2°C using neutral salt spray (5% NaCl solution, pH 6.5-7.2) for 0h, 24h, 48h, and 72h, respectively. Adhesion was tested in accordance with ISO 2409. The specific results are shown in the following table:

[0064]

[0065] As can be seen from the above table, the coatings prepared in the examples have good adhesion after coating, and the overall adhesion changes little after salt spray aging, and have good salt spray aging resistance.

[0066] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A light-cured coating with high adhesion, characterized in that: The photocurable coating is obtained by coating component A and component B in a mass ratio of 10-15:1 and then drying. Component A is composed of the following raw materials in weight parts: 40-60 parts of bisphenol A epoxy resin, 4-6 parts of alkyl acrylate monomer, 11-15 parts of γ-Fe2O3 nanoparticle modified alkyd resin, 2-4 parts of organic acid modified polystyrene microspheres, 0.6-1.2 parts of coupling agent, and 3-5 parts of silica powder; Component B is composed of the following materials in parts by weight: 8-10 parts of deionized water, 8-10 parts of photoinitiator, and 1-2 parts of accelerator.

2. The photocurable coating according to claim 1, wherein: The alkyl acrylate monomer is at least one of methyl acrylate, ethyl acrylate, and butyl acrylate.

3. The photocurable coating according to claim 1, wherein: The preparation method of the γ-Fe2O3 nanoparticle modified alkyd resin comprises the following steps: (1) Dispersing γ-Fe2O3 nanoparticles in clean water, adding silane coupling agent KH550, stirring evenly, and then filtering and drying to obtain surface-modified γ-Fe2O3; (2) The surface-modified γ-Fe2O3 is added to the alkyd resin in a mass ratio of 1-2:100, and xylene is used as a solvent. The mixture is stirred thoroughly and then the solvent is removed to obtain the γ-Fe2O3 nanoparticle-modified alkyd resin.

4. The photocurable coating according to claim 3, wherein: The particle size of the γ-Fe2O3 nanoparticles is 10-20 nm, and the rotation speed for fully stirring in step (2) is 800-1000 r / min, and the stirring time is 20-30 min.

5. The photocurable coating according to claim 1, wherein The preparation method of the organic acid-modified polystyrene microspheres comprises the following steps: (1) Place polystyrene microspheres in 98% sulfuric acid solution and stir for 40-60 minutes; (2) The polystyrene microspheres are taken out and washed until neutral, and then placed in an organic acid solution with a concentration of 20%-30%, stirred thoroughly for 2-4 hours, and then taken out and dried to obtain organic acid-modified polystyrene microspheres.

6. The photocurable coating according to claim 5, wherein: The particle size of the polystyrene microspheres is 40-100 nm.

7. The photocurable coating according to claim 1, wherein: The coupling agent is a silane coupling agent KH550, the photoinitiator is a mixture of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 1-hydroxycyclohexyl phenyl ketone and 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone in a mass ratio of 2:3:1; and the accelerator is at least one of dimethylethanolamine, triethanolamine, thioglycerol and thioglycolic acid.

8. A method for preparing a photocurable coating according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: S1. Preparation of component A: bisphenol A epoxy resin, alkyl acrylate monomer, γ-Fe2O3 nanoparticle-modified alkyd resin, 2-4 parts of organic acid-modified polystyrene microspheres, coupling agent, and silica powder are mixed, stirred evenly in a nitrogen atmosphere, and allowed to stand for degassing to obtain component A; S2. Preparation of component B: Disperse the photoinitiator and accelerator in deionized water to obtain component B; S3. When in use, mix component A and component B evenly and then apply them directly on the substrate, perform ultraviolet light curing treatment to form a light-cured coating.

9. The preparation method according to claim 8, characterized in that: The stirring speed in step S1 is 1200-1600 r / min, and the stirring time is 5-10 min.

Images