Glass laser etching burr-free UV coating as well as preparation method and application thereof

Abstract

The invention discloses a glass laser etching burr-free UV coating. The glass laser etching burr-free UV coating is prepared from the following raw materials in parts by weight: 6-14 parts of modified epoxy resin, 3-8 parts of thermoplastic acrylic resin, 10-20 parts of a monomer, 5-20 parts of urethane acrylate, 1-3 parts of an initiator, 1-3 parts of an auxiliary agent and 40-70 parts of a solvent. The epoxy acrylate with the functionality of 2 and the thermoplastic acrylic resin with the viscosity of 6000-7000 cps are combined for use and matched with the polyurethane acrylate with the functionality of 2 and the polyurethane acrylate with the functionality of 6, the curing speed of the coating and the mechanical property after curing can be regulated and controlled, and the requirements for toughness and hardness of laser etching are met. And after curing, a paint film is not colored, and the adhesive force on a glass substrate is excellent.

Description

Technical Field

[0001] The invention relates to UV coating for laser engraving glass without rough edges, a preparation method and application thereof, and relates to C09D, and in particular to the field of coating compositions. Background Art

[0002] Glass substrates are low-polar or non-polar materials, so the coating material on the surface of the glass substrate has low surface adhesion, is difficult to adhere, and has a slow curing speed. The coating cost on the glass substrate is high. In addition, the coating on the glass surface on the market is hard, brittle, and easy to peel or break. If laser engraving is performed on the glass paint film, the pattern is not easy to form, and the laser engraving yield is low. Therefore, it is very important to develop a paint film that has good adhesion on the glass surface, high toughness, and is easy to laser engrave.

[0003] Chinese invention patent CN202310340535.2 discloses a high temperature resistant glass electroplating UV primer and its preparation method. Through the combined effect of acrylic modified alkyd resin and aliphatic acrylic resin in a weight ratio of 1: (1.5-3), the adhesion of the coating can be increased to 5B, effectively improving the high temperature resistance of the coating, especially after baking at 180℃ for 1h, there is no blistering, peeling, or coloring on the surface, but the hardness of the paint film is relatively soft, and the laser carving effect is not good. Chinese invention patent CN201410579086.8 discloses a UV-heat dual curing coating for vacuum coating of car lights and its use method. The molar ratio of -OH group contained in the component to -NCO group contained in the component is (0.8-1.3): 1 and mixed evenly, so that the coating film has good adhesion and heat resistance on the plastic substrate that is difficult to adhere to. However, the curing time is long and the production capacity is low. Summary of the invention

[0004] In order to develop a coating which has excellent adhesion on the glass surface, is suitable for laser engraving, and does not emit color when cured, the first aspect of the present invention provides a UV coating for glass laser engraving without burrs, and the preparation raw materials include, by weight, 6-14 parts of modified epoxy resin, 3-8 parts of thermoplastic acrylic resin, 10-20 parts of monomer, 5-20 parts of polyurethane acrylate, 1-3 parts of initiator, 1-3 parts of auxiliary agent, and 40-70 parts of solvent.

[0005] As a preferred embodiment, the raw materials for preparation include, by weight, 10 parts of modified epoxy resin, 6 parts of thermoplastic acrylic resin, 15 parts of monomer, 10 parts of polyurethane acrylate, 2 parts of initiator, 2 parts of auxiliary agent, and 50 parts of solvent.

[0006] As a preferred embodiment, the functionality of the modified epoxy resin is 1-3, and the viscosity of the modified epoxy resin at 60° C. is 2000-4000 cps.

[0007] As a preferred embodiment, the functionality of the modified epoxy resin is 2.

[0008] As a preferred embodiment, the modified epoxy resin is purchased from Haohui, model number HE3218.

[0009] As a preferred embodiment, the thermoplastic acrylic resin has a viscosity of 6000-7000 cps at 25°C, an acid value of 6-10 mgKOH / g, and a glass transition temperature of 65-75°C.

[0010] As a preferred embodiment, the glass transition temperature (Tg) of the thermoplastic acrylic resin is 70°C.

[0011] As a preferred embodiment, the thermoplastic acrylic resin is purchased from Guangdong Porter New Materials Co., Ltd., model 1070.

[0012] As a preferred embodiment, the monomer is a hydroxyl-containing acrylic monomer, and the acrylic monomer is selected from one or a combination of trimethylolpropane triacrylate, hydroxyethyl methacrylate, hydroxyacrylic acid, 2-hydroxyethyl acrylate, 2-hydroxyethyl acrylate, and 2-hydroxyethyl acrylate.

[0013] As a preferred embodiment, the monomer is a combination of trimethylolpropane triacrylate and hydroxyethyl methacrylate.

[0014] As a preferred embodiment, the weight ratio of trimethylolpropane triacrylate to hydroxyethyl methacrylate is 1:(0.8-1.5).

[0015] As a preferred embodiment, the weight ratio of trimethylolpropane triacrylate to hydroxyethyl methacrylate is 1:1.2.

[0016] As a preferred embodiment, the polyurethane acrylate is an aliphatic polyurethane acrylate, and the functionality of the polyurethane acrylate is 2-6.

[0017] As a preferred embodiment, the aliphatic polyurethane acrylate is a combination of polyurethane acrylates with a functionality of 2 and a functionality of 6, and the polyurethane acrylate with a functionality of 6 has a viscosity of 2000-4000 cps at 60°C.

[0018] As a preferred embodiment, the polyurethane acrylate with a functionality of 2 has a viscosity of 52000-82000 cps at 60°C.

[0019] As a preferred embodiment, the weight ratio of the aliphatic polyurethane acrylates with functionalities of 2 and 6 is (3-8): (3-8).

[0020] As a preferred embodiment, the weight ratio of the aliphatic polyurethane acrylates with functionalities of 2 and 6 is 5:5.

[0021] During the experiment, the applicant found that the paint surface for laser engraving on the glass surface needs to meet certain toughness and hardness requirements to achieve the effect that the laser engraving is not easy to break, the pattern is easy to form, and it does not emit color after light curing. The possible reason is speculated to be: the use of 2-functionality epoxy acrylate in combination with a thermoplastic acrylic resin with a viscosity of 6000-7000cps and matched with 2-functionality polyurethane acrylate and 6-functionality polyurethane acrylate can regulate the curing speed of the coating and the mechanical properties after curing to meet the toughness and hardness requirements of laser engraving. 2-functionality epoxy acrylate has a certain reactivity and the thermoplastic acrylic resin with a viscosity of 6000-7000cps can achieve excellent adhesion and curing on the glass surface. During laser engraving, it can be instantly melted under the high temperature of the laser to achieve the engraving of the pattern, and then the 2-functionality polyurethane acrylate reacts quickly to avoid the technical problems of debris and brittleness during the laser engraving process. The applicant further discovered that when the weight ratio of the difunctional epoxy acrylate to the thermoplastic acrylic resin with a viscosity of 6000-7000cps is 5:3, the paint film does not emit color after curing and has excellent adhesion to the glass substrate. The reasons may be that the difunctional epoxy acrylate and the thermoplastic acrylic resin have good compatibility in the solvent, the appearance of the formed material is not turbid, the resins can be evenly dispersed with each other, and can adhere well to the glass surface after the reaction. At the same time, the coating system is stable, and the drying speed is basically the same during the curing process. Therefore, there will be no problem of coloring of the paint film after curing, and it will not affect the subsequent laser effect.

[0022] As a preferred embodiment, the initiator is a photoinitiator, and the photoinitiator is selected from one or a combination of alkyl phenone initiators, acyl phosphorus oxide initiators, and benzil initiators.

[0023] As a preferred embodiment, the initiator is 1-hydroxycyclohexyl phenyl ketone (initiator 184).

[0024] As a preferred embodiment, the auxiliary agent is a leveling agent purchased from Digo 2100.

[0025] As a preferred embodiment, the solvent is selected from toluene, xylene, butyl ester, ethyl ester or a combination of several thereof.

[0026] As a preferred embodiment, the solvent is a combination of toluene, xylene, butyl ester and ethyl ester.

[0027] As a preferred embodiment, the weight ratio of toluene, xylene, butyl ester and ethyl ester is (5-15): (5-15): (5-15): (15-25).

[0028] As a preferred embodiment, the weight ratio of toluene, xylene, butyl ester and ethyl ester is 10:10:10:20.

[0029] A second aspect of the present invention provides a method for preparing a UV coating for laser engraving glass without rough edges, comprising the following steps:

[0030] S1: adding thermoplastic acrylic resin to modified epoxy resin and stirring evenly, then adding monomer and polyurethane acrylate and stirring evenly;

[0031] S2: Add initiator and auxiliary agent, then add solvent and stir evenly.

[0032] The second aspect of the present invention provides an application of UV coating for laser engraving glass without rough edges, which is applied to the glass laser engraving process.

[0033] As a preferred embodiment, the application method comprises the following steps:

[0034] M1 glass pre-treatment cleaning, spraying UV coating, curing;

[0035] M2 is aluminum plated, sprayed with topcoat and cured.

[0036] As a preferred embodiment, the film thickness of the UV coating is 12-16 μm. The film thickness of the topcoat is 8-12 μm. The UV coating curing conditions are preheating at 50-70°C for 1-5 minutes and then curing to 800-1200 mj / cm 2 The obtained product is cured under ultraviolet light for 5 seconds, and then the plate is vacuum-plated with aluminum, and then the topcoat is sprayed on the electroplated aluminum film.

[0037] As a preferred embodiment, the curing condition of the topcoat is to preheat at 50-60°C for 1-5 minutes and then release to 600-800 mj / cm 2 Curing under ultraviolet light for 3-5s.

[0038] As a preferred embodiment, the UV coating curing condition is to preheat at 60°C for 3 minutes and then release to 1000 mj / cm 2 After curing for 5 seconds under ultraviolet light, the plate was vacuum-plated with aluminum.

[0039] As a preferred embodiment, the topcoat curing condition is to preheat at 60°C for 3 minutes and then release to 600mj / cm 2 The obtained product was cured under ultraviolet light for 5 seconds.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] (1) The UV coating for laser engraving glass without rough edges of the present invention adopts a combination of a 2-functionality epoxy acrylate and a thermoplastic acrylic resin with a viscosity of 6000-7000cps, and is matched with a 2-functionality polyurethane acrylate and a 6-functionality polyurethane acrylate. The curing speed of the coating and the mechanical properties after curing can be adjusted to meet the toughness and hardness requirements of laser engraving.

[0042] (2) The UV coating for laser engraving glass without rough edges of the present invention comprises a difunctional epoxy acrylate and a thermoplastic acrylic resin with a viscosity of 6000-7000 cps in a weight ratio of 5:3. After curing, the coating film is non-colorful and has excellent adhesion to the glass substrate.

[0043] (3) The UV coating for laser engraving glass without rough edges of the present invention has a short curing time, low energy required for curing, high production capacity in a short time, and low energy consumption.

[0044] (4) The UV coating for laser engraving glass without rough edges of the present invention adopts a monomer combination of trimethylolpropane triacrylate and hydroxyethyl methacrylate, and can prepare laser engraving patterns with brushed edges and soft edges on the coating surface.

[0045] (5) The UV coating for laser engraving glass without rough edges of the present invention is coated on the glass and then plated with a metal layer. The coating has good adhesion to the metal layer, and an excellent laser effect can be obtained with good surface performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a photo of the UV coating prepared in Example 2 after application;

[0047] Figure 2 The coloring effect of the UV coating prepared in Example 2 after being applied to the glass surface;

[0048] Figure 3 This is the coloring effect of the UV coating prepared in Example 3 after being applied to the glass surface. DETAILED DESCRIPTION

[0049] Example 1

[0050] A UV coating for laser engraving glass without rough edges. The raw materials for its preparation include, by weight, 5 parts of modified epoxy resin, 6 parts of thermoplastic acrylic resin, 15 parts of monomer, 10 parts of polyurethane acrylate, 2 parts of initiator, 2 parts of auxiliary agent and 50 parts of solvent.

[0051] The functionality of the modified epoxy resin is 2, the viscosity of the modified epoxy resin at 60° C. is 2000-4000 cps, and the modified epoxy resin is purchased from Haohui with a model number of HE3218.

[0052] The thermoplastic acrylic resin has a viscosity of 6000-7000 cps at 25° C., an acid value of 6-10 mgKOH / g, and a glass transition temperature of 70° C. It was purchased from Guangdong Porter New Materials Co., Ltd., model 1070.

[0053] The monomer is a combination of trimethylolpropane triacrylate and hydroxyethyl methacrylate, with a weight ratio of 1:1.2.

[0054] The polyurethane acrylate is a combination of aliphatic polyurethane acrylates with a functionality of 2 and a functionality of 6, with a weight ratio of 5:5. The polyurethane acrylate with a functionality of 6 has a viscosity of 2000-4000 cps at 60°C and is purchased from Sanmu, model 6621; the polyurethane acrylate with a functionality of 2 has a viscosity of 52000-82000 cps at 60°C and is purchased from Hengzhiguang, model 7230E.

[0055] The initiator is 1-hydroxycyclohexyl phenyl ketone (Initiator 184).

[0056] The auxiliary agent is a leveling agent purchased from Digo 2100.

[0057] The solvent is a combination of toluene, xylene, butyl ester and ethyl ester in a weight ratio of 10:10:10:20.

[0058] A method for preparing UV coating for laser engraving glass without rough edges comprises the following steps:

[0059] S1: adding thermoplastic acrylic resin to modified epoxy resin and stirring evenly, then adding monomer and polyurethane acrylate and stirring evenly;

[0060] S2: Add initiator and auxiliary agent, then add solvent and stir evenly.

[0061] Example 2

[0062] A UV coating for laser engraving glass without rough edges. The raw materials for its preparation include, by weight, 10 parts of modified epoxy resin, 6 parts of thermoplastic acrylic resin, 15 parts of monomer, 10 parts of polyurethane acrylate, 2 parts of initiator, 2 parts of auxiliary agent and 50 parts of solvent.

[0063] Other specific implementations are the same as in Example 1.

[0064] Example 3

[0065] A UV coating for laser engraving glass without rough edges. The raw materials for its preparation include, by weight, 15 parts of modified epoxy resin, 6 parts of thermoplastic acrylic resin, 15 parts of monomer, 10 parts of polyurethane acrylate, 2 parts of initiator, 2 parts of auxiliary agent and 50 parts of solvent.

[0066] Other specific implementations are the same as in Example 1.

[0067] Example 4

[0068] A UV coating for laser engraving glass without rough edges is prepared by raw materials comprising, by weight, 20 parts of modified epoxy resin, 10 parts of thermoplastic acrylic resin and 70 parts of solvent.

[0069] The modified epoxy resin was purchased from Jiangsu Sanmu Chemical Co., Ltd., model: 6105-80.

[0070] The thermoplastic acrylic resin has a viscosity of 6000-7000 cps at 25° C., an acid value of 6-10 mgKOH / g, and a glass transition temperature of 70° C. It was purchased from Guangdong Porter New Materials Co., Ltd., model 1070.

[0071] The solvent is a combination of toluene, xylene, butyl ester and ethyl ester in a weight ratio of 10:10:10:20.

[0072] A method for preparing UV coating for laser engraving glass without rough edges comprises the following steps:

[0073] Add thermoplastic acrylic resin to the modified epoxy resin, mix and stir evenly, then add the solvent and stir evenly to obtain the product.

[0074] Example 5

[0075] A UV coating for laser engraving glass without rough edges is prepared by raw materials comprising, by weight, 20 parts of modified epoxy resin, 10 parts of thermoplastic acrylic resin and 70 parts of solvent.

[0076] The modified epoxy resin was purchased from Guangdong Haohui New Materials Co., Ltd., model: CR90455.

[0077] The thermoplastic acrylic resin has a viscosity of 6000-7000 cps at 25° C., an acid value of 6-10 mgKOH / g, and a glass transition temperature of 70° C. It was purchased from Guangdong Porter New Materials Co., Ltd., model 1070.

[0078] The solvent is a combination of toluene, xylene, butyl ester and ethyl ester in a weight ratio of 10:10:10:20.

[0079] The preparation method of a UV coating for laser engraving glass without rough edges is the same as that of Example 4.

[0080] Performance Testing

[0081] 1. After the modified epoxy resin, thermoplastic acrylic resin and solvent of Example 1 were mixed, they were compared with the materials of Examples 4 and 5. The results showed that the appearance of the material of Example 1 was not turbid, while the appearance of the materials of Examples 4 and 5 was turbid.

[0082] 2. The UV coating of Examples 1-3 is applied to glass laser engraving process, and the application method comprises the following steps: M1 glass pre-treatment cleaning, spraying coating, and curing; M2 aluminum plating, spraying topcoat, and curing.

[0083] The coating film thickness is 12-16 μm. The UV coating curing conditions are preheating at 60°C for 3 minutes and then curing to 1000 mj / cm 2 The obtained product is cured under ultraviolet light for 5 seconds, and then the plate is vacuum-plated with aluminum, and then the topcoat is sprayed on the electroplated aluminum film.

[0084] The coating film thickness of the topcoat is 8-12 μm. The curing conditions of the topcoat are preheating at 60°C for 3 minutes and then curing to 600 mj / cm 2 The topcoat was purchased from Zhaoqing Hali Chemical Co., Ltd., model number UV-520-2.

[0085] The surfaces of the paint films of Examples 1-3 after curing were scratched 100 times to test the performance of the knife edge during the scratching process; the adhesion of the paint films was tested according to ASTM D3359-2002; and the observed 600 mj / cm 2 Color development of paint film after energy curing.

[0086] The test results are shown in Table 1.

[0087] The actual photo of the UV coating prepared in Example 2 after application is shown in Figure 1 The coloring effect of the UV coating prepared in Example 2 after being applied to the glass surface is shown in Figure 2 The coloring effect of the UV coating prepared in Example 3 after being applied to the glass surface is shown in Figure 3 , the result is colorful.

[0088] Table 1

[0089]

[0090]

Claims

1. A UV coating for glass laser engraving without rough edges, characterized in that: The raw materials for preparation include 6-14 parts of modified epoxy resin, 3-8 parts of thermoplastic acrylic resin, 10-20 parts of monomer, 5-20 parts of polyurethane acrylate, 1-3 parts of initiator, 1-3 parts of auxiliary agent and 40-70 parts of solvent in parts by weight.

2. The UV coating for glass laser engraving without rough edges according to claim 1, characterized in that: The functionality of the modified epoxy resin is 1-3, and the viscosity of the modified epoxy resin at 60° C. is 2000-4000 cps.

3. The UV coating for laser engraving glass without rough edges according to claim 1, characterized in that: The thermoplastic acrylic resin has a viscosity of 6000-7000 cps at 25°C, an acid value of 6-10 mgKOH / g, and a glass transition temperature of 65-75°C.

4. The UV coating for laser engraving glass without rough edges according to claim 1, characterized in that: The monomer is a hydroxyl-containing acrylic monomer, and the acrylic monomer is selected from one or a combination of trimethylolpropane triacrylate, hydroxyethyl methacrylate, hydroxy acrylic acid, 2-hydroxyethyl acrylate, 2-hydroxyethyl acrylate, and 2-hydroxyethyl acrylate.

5. The UV coating for laser engraving glass without rough edges according to claim 1, characterized in that: The polyurethane acrylate is aliphatic polyurethane acrylate, and the functionality of the polyurethane acrylate is 2-6.

6. The UV coating for laser engraving glass without rough edges according to claim 5, characterized in that: The aliphatic polyurethane acrylate is a combination of polyurethane acrylates with a functionality of 2 and a functionality of 6, and the polyurethane acrylate with a functionality of 6 has a viscosity of 2000-4000 cps at 60°C.

7. The UV coating for laser engraving glass without rough edges according to claim 1, characterized in that: The initiator is a photoinitiator, and the photoinitiator is selected from one or a combination of alkyl phenone initiators, acyl phosphorus oxide initiators, and benzil initiators.

8. A method for preparing the UV coating for laser engraving glass without rough edges according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: adding thermoplastic acrylic resin to modified epoxy resin and stirring evenly, then adding monomer and polyurethane acrylate and stirring evenly; S2: Add initiator and auxiliary agent, then add solvent and stir evenly.

9. An application of the UV coating for laser engraving glass without rough edges according to any one of claims 1 to 7, characterized in that: Used in glass laser engraving process.

10. The application of UV coating for laser engraving glass without rough edges according to claim 9, characterized in that: The application method comprises the following steps: M1 glass pre-treatment cleaning, spraying UV coating, curing; M2 is aluminum plated, sprayed with topcoat and cured.

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