UV photocuring varnish and preparation method thereof

Abstract

The invention relates to UV (ultraviolet) light-cured varnish and a preparation method thereof, and belongs to the technical field of coatings. The UV light-cured varnish comprises the following components in parts by weight: 50-65 parts of resin; 3-7 parts of a photoinitiator; 1-3 parts of a leveling agent; 15 to 25 parts of a solvent; 0.5 to 1 part of a defoaming agent; 0.4 to 0.8 part of an anti-aging auxiliary agent; and 0.2 to 0.6 part of an ultraviolet absorbent. Compared with the prior art, the UV varnish disclosed by the invention is high in solid content, and the hardness and wear resistance of the UV varnish can meet test requirements; and compared with a traditional UV photocureable coating, the coating disclosed by the invention is moderate in cost, and the time cost, the labor cost and the financial cost of customers can be saved.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a UV light-curing varnish and a preparation method thereof. Background Art

[0002] UV-curing coatings have the advantages of environmental protection, low energy consumption, low coating cost, and convenient construction. At a time when the market's environmental protection requirements are becoming increasingly stringent, they have very large technical advantages and development potential. Compared with traditional solvent-based coatings, UV-curing coatings (i.e., UV light-curing coatings) are mainly composed of UV oligomers and unsaturated double bonds in active diluents participating in the curing reaction, which greatly reduces the generation of VOCs and odors in the system. However, UV-curing coatings have not achieved completely zero VOC. The VOC source of its products is partly small molecules in the system that do not participate in photocuring, and the other part may come from small molecule cleavage products produced by photoinitiators after being irradiated with ultraviolet light.

[0003] The advantages of light curing over traditional curing are fast curing speed and instant film formation; all components participate in the reaction, no volatile organic solvents, in line with the requirements of green chemistry, economic and environmentally friendly; the curing process can be automated and can be used for continuous production; the equipment is small and the investment is low; "cold light" - ultraviolet light directly triggers the reaction, has no temperature requirements, has few restrictions on the reaction substrate, can be coated with heat-sensitive and heat-capacity substrates; the coating has good quality and excellent deep-layer performance. However, light-cured varnish has poor adhesion and low hardness. Summary of the invention

[0004] The purpose of the present invention is to provide a UV light curing varnish and a preparation method thereof in order to overcome at least one of the defects of the prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] One of the objects of the present invention is a UV light curing varnish comprising the following components in parts by weight:

[0007] Resin 50-65 parts;

[0008] 3-7 parts of photoinitiator;

[0009] 1-3 parts of leveling agent;

[0010] 15-25 parts of solvent;

[0011] Defoaming agent 0.5-1 part;

[0012] Anti-aging agent 0.4-0.8 parts;

[0013] Ultraviolet absorber 0.2-0.6 parts.

[0014] Furthermore, the resin comprises acrylic resin and styrene resin in a mass ratio of (35-40):(15-25).

[0015] Furthermore, the photoinitiator comprises 2,4,6 (trimethylbenzoyl) diphenylphosphine oxide and benzoin dimethyl ether in a mass ratio of (1-3): (2-4).

[0016] Furthermore, the leveling agent is isophorone.

[0017] Furthermore, the solvent comprises butyl acetate and ethylene glycol butyl ether acetate in a mass ratio of (10-15):(5-10).

[0018] Furthermore, the defoaming agent is dihexadecyl phosphate.

[0019] Furthermore, the anti-aging aid is hexamethylphosphoric triamide.

[0020] Furthermore, the ultraviolet absorber is 6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline.

[0021] The second object of the present invention is a method for preparing the UV light-curing varnish as described above, comprising the following steps:

[0022] Add the solvent and the photoinitiator to the mixer in sequence and perform the first stirring. After the photoinitiator is completely dissolved, add the leveling agent, resin, defoamer, ultraviolet absorber and anti-aging agent. After adding, perform the second stirring until the dispersion is uniform to prepare the UV light-curing varnish.

[0023] Furthermore, the first stirring is carried out at a rotation speed of 500-800 rpm; and the second stirring is carried out at a tangential speed of 12-15 m / s for 15-20 min.

[0024] Compared with the prior art, the present invention has the following beneficial effects.

[0025] 1) The UV varnish of the present invention has a high solid content, and its hardness and wear resistance can meet the test requirements.

[0026] 2) Compared with traditional UV light-curing coatings, the coating of the present invention has a moderate cost, which can save customers time, labor and financial costs. DETAILED DESCRIPTION

[0027] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0028] Example 1

[0029] This embodiment 1 provides a UV light curing varnish, and the preparation method is as follows:

[0030] (1) Prepare the materials according to the weight content of each component recorded in Table 1;

[0031] Table 1

[0032] Components Weight Acrylic resin 40 Styrene resin 25 2,4,6(Trimethylbenzoyl)diphenylphosphine oxide 3 Benzoin dimethyl ether BDK 3 Isophorone 2 Butyl acetate 15 Ethylene glycol butyl ether acetate 10 Dihexadecyl phosphate 1 Hexamethylphosphoric acid triamide 0.6 6-Ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline 0.4 total 100

[0033] (2) Add the solvent and the photoinitiator in sequence at a stirring speed of 500-800 rpm. After the photoinitiator is completely dissolved, add the resin, the leveling agent, the defoaming agent, the ultraviolet absorber and the anti-aging agent. After adding, stir at a tangential speed of 12-15 m / s for 15-20 minutes until the mixture is evenly dispersed, thereby preparing a UV light-curing varnish coating.

[0034] (3) A high-solvent diluent for UV-curable varnish coating is prepared, the diluent comprising the following components and weight contents: 25 parts of diisobutyl ketone, 25 parts of dipropylene glycol diacrylate, 25 parts of acetone, and 25 parts of ethyl acetate. After mixing the solvents, stir at a tangential speed of 7-10 m / s for 10 minutes until the mixture is uniform, to obtain a diluent.

[0035] (4) UV light-curing varnish coating and carbamate as curing agent and diluent are mixed in a mass ratio of 10:1:5 (theoretical spray solid content 46.9%), and sprayed on 4 surfaces of the material normally, left to stand for 3-5 minutes, and then placed in a 70°C oven for 3-5 minutes, cured by UV machine, and then placed in an 80°C oven for 8-10 hours. Table 2 shows the performance test results of UV light-curing varnish coating.

[0036] Table 2

[0037]

[0038]

[0039] Example 2

[0040] The preparation method of this embodiment is consistent with that of embodiment 1, except that the formula of step 1 is different. The formula of this embodiment is shown in Table 3

[0041] Table 3

[0042] Components Weight Acrylic resin 35 Styrene resin 15 2,4,6(Trimethylbenzoyl)diphenylphosphine oxide 1 Benzoin dimethyl ether BDK 2 Isophorone 1 Butyl acetate 10 Ethylene glycol butyl ether acetate 5 Dihexadecyl phosphate 0.5 Hexamethylphosphoric acid triamide 0.4 6-Ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline 0.2 total 100

[0043] Example 3

[0044] The preparation method of this embodiment is consistent with that of embodiment 1, except that the formula of step 1 is different. The formula of this embodiment is shown in Table 4.

[0045]

[0046]

[0047] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A UV light curing varnish, characterized in that: The composition comprises the following components in parts by weight: Resin 50-65 parts; 3-7 parts of photoinitiator; 1-3 parts of leveling agent; 15-25 parts of solvent; Defoaming agent 0.5-1 part; Anti-aging agent 0.4-0.8 parts; Ultraviolet absorber 0.2-0.6 parts.

2. A UV light curing varnish according to claim 1, characterized in that: The resin comprises acrylic resin and styrene resin in a mass ratio of (35-40):(15-25).

3. A UV light curing varnish according to claim 1, characterized in that: The photoinitiator comprises 2,4,6 (trimethylbenzoyl) diphenylphosphine oxide and benzoin dimethyl ether in a mass ratio of (1-3): (2-4).

4. A UV light curing varnish according to claim 1, characterized in that: The leveling agent is isophorone.

5. A UV light curing varnish according to claim 1, characterized in that: The solvent includes butyl acetate and ethylene glycol butyl ether acetate in a mass ratio of (10-15):(5-10).

6. A UV light curing varnish according to claim 1, characterized in that: The defoaming agent is dihexadecyl phosphate.

7. A UV light curing varnish according to claim 1, characterized in that: The anti-aging auxiliary agent is hexamethylphosphoric triamide.

8. A UV light curing varnish according to claim 1, characterized in that: The ultraviolet absorber is 6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline.

9. A method for preparing a UV light-curing varnish as claimed in any one of claims 1 to 8, characterized in that: The steps include: Add the solvent and the photoinitiator to the mixer in sequence, and perform the first stirring. After the photoinitiator is completely dissolved, add the leveling agent, resin, defoamer, ultraviolet absorber and anti-aging agent. After adding, perform the second stirring until the dispersion is uniform to prepare the UV light-curing varnish.

10. The method for preparing a UV light-curing varnish according to claim 9, characterized in that: The first stirring is performed at a rotation speed of 500-800 rpm; the second stirring is performed at a tangential speed of 12-15 m / s for 15-20 min.

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