Wood lacquer suitable for EB curing and preparation method and application thereof

Abstract

The invention relates to the field of wood lacquer, in particular to wood lacquer suitable for EB curing and a preparation method and application of the wood lacquer. The wood lacquer suitable for EB curing provided by the invention is prepared from the following raw materials: urethane acrylate, epoxy acrylate, a reactive diluent, an acrylate leveling agent, a light stabilizer, a photoinitiator, a radiation curing leveling agent, a wetting agent and an organic silicon leveling agent. The product has excellent yellowing resistance after EB curing, the hardness of the coating is greater than 6H, the weather resistance and wear resistance are excellent, the odor is low, and the actual use effect is excellent.

Description

Technical Field

[0001] The invention relates to the field of wood paint, in particular to a wood paint suitable for EB curing and a preparation method and application thereof. Background Art

[0002] Wood paint has the advantages of strong protection, improved aesthetics, easy cleaning, environmentally friendly choice, wide use, continuous technological progress and simple construction. At present, the most common construction method for wood paint and other coatings is UV light curing. For example, patent document CN107722797B discloses a white wood paint cured by UV-LED light source. The product can be quickly cured under UV light irradiation, has high production efficiency, and significantly shortens the production cycle. In addition, compared with the traditional thermal curing process, the UV light curing process saves a lot of time and energy, and UV-type coatings do not require additional organic solvents during the production process, and the production process is more green and environmentally friendly. However, there are some "disadvantages" of UV light curing that cannot be ignored, including: the curing rate has a certain limit, the deep penetration is not enough, some small molecule raw material monomers remain, cannot be completely cured, and the large amount of initiator added leads to a strong odor, etc.; there is an urgent need for a high-performance wood paint suitable for a new curing process.

[0003] EB curing, or electron beam curing, is a type of radiation curing technology. Specifically, EB curing is a process in which a high-energy electron beam directly acts on the system to be cured, causing it to undergo polymerization, grafting or cross-linking reactions, thereby curing the coating. In addition, EB curing can be performed at room temperature and has the characteristics of high-speed curing, with a curing rate of 1 level / 10s, a penetration depth of up to hundreds of microns, and a curing degree of 95%-100%. EB curing technology is energy-efficient and efficient, saving 60% more energy than UV curing technology, and does not produce harmful substances, making it environmentally friendly.

[0004] Currently, there are few reports in the prior art on excimer skin-feel wood paints suitable for EB curing, with high hardness and yellowing resistance. Summary of the invention

[0005] In order to solve the above technical problems, the first aspect of the present invention provides a wood paint suitable for EB curing, the preparation raw materials of which include: polyurethane acrylate, epoxy acrylate, reactive diluent, acrylate leveling agent, light stabilizer, photoinitiator, radiation curing leveling agent, wetting agent and silicone leveling agent.

[0006] As an implementable case, the raw materials for preparing the wood paint include, by mass, 20-40 parts of polyurethane acrylate, 40-50 parts of epoxy acrylate, 10-30 parts of reactive diluent, 1-3 parts of acrylate leveling agent, 0.1-0.5 parts of light stabilizer, 0.3-1 parts of photoinitiator, 1-5 parts of radiation curing leveling agent, 0.3-1 parts of wetting agent and 0.1-0.2 parts of silicone leveling agent.

[0007] Furthermore, the raw materials for preparing the wood paint include, by weight, 30 parts of polyurethane acrylate, 40 parts of epoxy acrylate, 25.6 parts of reactive diluent, 1 part of acrylate leveling agent, 0.3 parts of light stabilizer, 0.4 parts of photoinitiator, 2 parts of radiation curing leveling agent, 0.5 parts of wetting agent and 0.2 parts of silicone leveling agent.

[0008] As an implementable case, the brands of the polyurethane acrylate include: one or more of Etercure 6145-100, Etercure 6196-100, ETERCURE 5188, and Etercure DR-W402S; all of which can be purchased from Changxing Chemical Industry Co., Ltd.

[0009] Furthermore, the brands of the polyurethane acrylate include: Etercure 6145-100 and Etercure 6196-100.

[0010] Furthermore, the mass ratio of the polyurethane acrylates of Etercure 6145-100 and Etercure 6196-100 is (1-2):1.

[0011] Furthermore, the mass ratio of the polyurethane acrylates Etercure 6145-100 and Etercure 6196-100 is 1:1.

[0012] As an implementable case, the viscosity of the epoxy acrylate at 25° C. is 30,000-60,000 mPa.s.

[0013] Furthermore, the epoxy acrylate has a viscosity of 37000-57000 mPa.s at 25° C., a brand of 6100D-85, and is purchased from Guangdong Hengzhiguang Environmental Protection New Materials Co., Ltd.

[0014] As an implementable case, the active diluent includes one or more of TPGDA, HDDA, DPGDA, PEGDA, ACMO, PPTTA, and DPHA.

[0015] Furthermore, the active diluent includes TPGDA and HDDA; the mass ratio of TPGDA to HDDA is (1-2):1.

[0016] Furthermore, the mass ratio of TPGDA to HDDA is 15:10.6; both can be purchased from Changxing Chemical Industry Co., Ltd.

[0017] Epoxy acrylate has high hardness and wear resistance, but relatively poor flexibility; polyurethane acrylate has good flexibility and adhesion, but its hardness may not be as good as epoxy acrylate. By compounding the two, wood paint can achieve a good balance between hardness and flexibility to meet the needs of different application scenarios. In addition, epoxy acrylate and polyurethane acrylate can be quickly cured under EB radiation. The compounded wood paint has a wider curing window and faster curing speed, thereby improving the production efficiency of the product.

[0018] Regarding the active diluent, the present invention preferably uses a compound of TPGDA and HDDA; both TPGDA and HDDA contain acrylate functional groups, which can quickly initiate polymerization reactions under EB radiation, thereby promoting the curing of wood paint. The compound use of these two active diluents can further increase the curing rate of wood paint, shorten the curing time, and improve the bonding strength and production efficiency of the product. In addition, since HDDA has a longer carbon chain, it can provide better flexibility and adhesion, while TPGDA has a lower viscosity and a good dilution effect. The combination of the two can achieve a more efficient curing process; TPGDA can provide better hardness and wear resistance, while HDDA gives the cured film better flexibility and adhesion. After compounding, a good balance between hardness and flexibility can also be achieved.

[0019] As an implementable case, the brands of the acrylic leveling agent include: one of HY-361N, NT-2038, BYK-358N, TEGO Glide-110, and TEGO Glide-130.

[0020] Furthermore, the brand of the acrylic leveling agent is BYK-358N, purchased from BYK Chemical.

[0021] Acrylic leveling agents can effectively reduce the surface tension of wood paint, allowing it to form a smoother and more uniform coating during the coating process, thereby reducing or eliminating defects such as shrinkage holes, pinholes, and orange peel on the coating surface, and improving the appearance quality of the wood paint; in addition, during the EB curing process, the fluidity of the wood paint is significantly improved, thereby ensuring that the coating has excellent flatness and smoothness after curing.

[0022] As an practicable case, the light stabilizer includes one or more of Tinuvin 1130, Tinuvin 234, Tinuvin 328, Tinuvin 326, Tinuvin 384, Tinuvin 171, Tinuvin 479, Tinuvin 770, Tinuvin 900, Tinuvin 400, Tinuvin 477, Tinuvin 405, Tinuvin 292, Tinuvin 123, Tinuvin 144, and Tinuvin 152.

[0023] Furthermore, the brand of the light stabilizer is Tinuvin 400, purchased from BASF.

[0024] As an implementable case, the photoinitiator includes one or more of TPO, MBF, photoinitiator 2959, photoinitiator 651, and DETX.

[0025] Furthermore, the photoinitiator includes: TPO and MBF, both of which can be purchased from Tianjin Jiuri New Materials Co., Ltd.; the mass ratio of TPO to MBF is 1:1.

[0026] As an implementable example, the brands of the radiation curing leveling agent include: EBECRYL 1360 and / or TEGO Rad 2700.

[0027] Furthermore, the brand of the radiation curing leveling agent is TEGO Rad 2700, which is purchased from Evonik Specialty Chemicals Co., Ltd.

[0028] TEGO Rad 2700 can significantly reduce the surface tension of wood paint, making it easier to spread on the substrate, thereby effectively improving the leveling performance of the coating film, and helping to form a smooth and flat coating film, improving the overall aesthetics and quality of the coating film. In addition, TEGO Rad 2700 can participate in the radiation cross-linking reaction during the EB curing process to form a more compact and stable coating film structure, which helps to improve the hardness, wear resistance and chemical resistance of the coating film and extend the service life of the coating film.

[0029] As an implementable case, the brands of the wetting agent include: one or more of EFKA 4100, ST-1075, ST-1070, BYK-104, BYK-333, BYK-104S.

[0030] Furthermore, the brand of the wetting agent is EFKA 4010, purchased from BASF.

[0031] As an implementable case, the brands of the organosilicon leveling agent include: one or more of BYK-331, BYK-378, BYK-3700, TEGO 450, TEGO 2100, and SF-6045.

[0032] Furthermore, the brand of the organosilicon leveling agent is TEGO 450, which is purchased from Evonik Specialty Chemicals Co., Ltd.

[0033] The second aspect of the present invention provides a method for preparing an EB-cured high-hardness, yellowing-resistant wood paint, comprising:

[0034] S1. Add polyurethane acrylate, epoxy acrylate and reactive diluent in sequence, and stir and disperse at 400-600 rpm for 10-15 minutes to make them completely dispersed;

[0035] S2. Add acrylic leveling agent and light stabilizer, and continue to stir and disperse at 400-600 rpm for 5-10 minutes to make them completely dispersed;

[0036] S3, add photoinitiator, continue stirring and dispersing at 600-800 rpm for 15-20 min, and control the particle size in the system to be ≤25 μm;

[0037] S4. Add radiation curing leveling agent, wetting agent and silicone leveling agent, continue stirring and dispersing at 400-600 rpm for 5-10 minutes to make it completely dispersed, and then cool to room temperature.

[0038] The third aspect of the present invention provides an application of an EB-cured high-hardness, yellowing-resistant wood paint, the application steps comprising: coating the wood paint on a substrate and performing EB curing.

[0039] Beneficial Effects

[0040] (i) The present invention prepares wood paint by selecting polyurethane acrylate and epoxy acrylate, so that the wood paint can achieve a good balance between hardness and flexibility.

[0041] (ii) The present invention selects epoxy acrylate with a viscosity of 37000-57000 mPa.s at 25°C and a grade of 6100D-85, which can make the wood paint have excellent adhesion and bonding properties.

[0042] (III) The present invention preferably uses TPGDA and HDDA as active diluents, which can also enable wood coatings to achieve a good balance between hardness and flexibility.

[0043] (iv) In the raw material system of the present invention, the amount of photoinitiator added is relatively small; the odor of the product is relatively low; and the preparation raw materials do not include organic solvents, so the product is more environmentally friendly.

[0044] (V) The wood paint provided by the present invention has a simple construction process and is easy to operate. The paint surface hardness is ≥6H, the yellowing resistance exceeds the national standard level 1, the weather resistance is excellent, and the scratch resistance is excellent. The product has excellent stain resistance. DETAILED DESCRIPTION

[0045] Example 1

[0046] The first aspect of this example provides a wood paint suitable for EB curing, and the raw materials for its preparation, calculated by weight, include: 30 parts of polyurethane acrylate, 40 parts of epoxy acrylate, 25.6 parts of reactive diluent, 1 part of acrylate leveling agent, 0.3 parts of light stabilizer, 0.4 parts of photoinitiator, 2 parts of radiation curing leveling agent, 0.5 parts of wetting agent and 0.2 parts of silicone leveling agent.

[0047] The brands of polyurethane acrylic acid include: Etercure 6145-100 and Etercure 6196-100, and the mass ratio of the two is 1:1; wherein, Etercure 6145-100 and Etercure 6196-100 are both purchased from Changxing Chemical Industry Co., Ltd.

[0048] The epoxy acrylate has a brand number of 6100D-85 and is purchased from Guangdong Hengzhiguang Environmental Protection New Materials Co., Ltd.

[0049] The active diluent includes TPGDA and HDDA; the mass ratio of TPGDA to HDDA is 15:10.6, and both are purchased from Changxing Chemical Industry Co., Ltd.

[0050] The brand of the acrylic leveling agent is BYK358N, purchased from BYK Chemicals.

[0051] The light stabilizer is Tinuvin 400, purchased from BASF.

[0052] The photoinitiator includes TPO and MBF, and the mass ratio of the two is 1:1; wherein, TPO and MBF are both purchased from Tianjin Jiuri New Materials Co., Ltd.

[0053] The brand of the radiation curing leveling agent is TEGO Rad 2700, which is purchased from Evonik Specialty Chemicals Co., Ltd.

[0054] The brand of the wetting agent is EFKA 4100, purchased from BASF.

[0055] The brand of the organosilicon leveling agent is TEGO 450, which is purchased from Evonik Specialty Chemicals Co., Ltd.

[0056] A second aspect of the present invention provides a method for preparing a wood coating suitable for EB curing, comprising:

[0057] S1. Add polyurethane acrylate, epoxy acrylate and reactive diluent in sequence, and stir and disperse at 600 rpm for 15 minutes to make them completely dispersed;

[0058] S2, then add acrylic leveling agent and light stabilizer, continue to stir and disperse at 600 rpm for 10 minutes to make it completely dispersed;

[0059] S3, add the photoinitiator, continue to stir and disperse at 800 rpm for 20 minutes, and control the particle size in the system to be ≤25 μm;

[0060] S4. Add radiation curing leveling agent, wetting agent and silicone leveling agent, continue stirring and dispersing at 600 rpm for 10 minutes to make it completely dispersed, and then cool to room temperature to obtain.

[0061] Example 2

[0062] This example provides an application of a wood coating suitable for EB curing, the steps comprising:

[0063] 1) Use roller coating to evenly apply a layer of UV yellowing resistant adhesion primer on the surface of the melamine board, with a coating amount of 20g / m 2 ;

[0064] 2) Use a mercury lamp to semi-dry cure the UV yellowing-resistant adhesion primer after coating, with a curing energy of 200mJ / cm 2 , so that the UV yellowing resistant adhesion primer is partially cured;

[0065] 3) Apply a layer of UV yellowing resistant sanding primer on the surface of the melamine board by forward and reverse roller coating, with a coating amount of 40g / m 2 This layer of UV yellowing resistant sanding primer has a sanding effect, which can improve the adhesion and flatness of subsequent wood paint;

[0066] 4) Use a mercury lamp to fully cure the UV yellowing resistant sanding primer after coating, and the curing energy is 300mJ / cm 2 , ensure that the UV yellowing resistant sanding primer is fully cured to form a hard coating;

[0067] 5) Use 400# and 600# sandpaper to sand the cured coating respectively;

[0068] 6) Continue to apply the wood paint prepared in Example 1 by forward and reverse roller coating, with a coating amount of 45 g / m 2 , this layer of wood paint has a skin-feel effect, which can give the coating a soft touch;

[0069] 7) Use a mercury lamp to pre-cure the applied skin-feel topcoat with a curing energy of 60mJ / cm 2 ;

[0070] 8) Use excimer curing technology to further cure the pre-cured wood paint to form a matte film with a skin-feeling effect, so that the coating has a better touch and visual effect;

[0071] 9) Fully cure the final coating using LED light with a curing energy of 2500mJ / cm 2 , ensure that the coating is fully cured to form a stable and hard protective film.

[0072] Example 3

[0073] This example provides an application of a wood coating suitable for EB curing, the steps comprising:

[0074] 1) Use roller coating to evenly apply a layer of UV yellowing resistant adhesion primer on the surface of the melamine board, with a coating amount of 20g / m 2 ;

[0075] 2) Use a mercury lamp to semi-dry cure the UV yellowing-resistant adhesion primer after coating, with a curing energy of 200mJ / cm 2 , so that the UV yellowing resistant adhesion primer is partially cured;

[0076] 3) Apply a layer of UV yellowing resistant sanding primer on the surface of the melamine board by forward and reverse roller coating, with a coating amount of 40g / m 2 This layer of UV yellowing resistant sanding primer has a sanding effect, which can improve the adhesion and flatness of subsequent wood paint;

[0077] 4) Use a mercury lamp to fully cure the UV yellowing resistant sanding primer after coating, and the curing energy is 300mJ / cm 2 , ensure that the UV yellowing resistant sanding primer is fully cured to form a hard coating;

[0078] 5) Use 400# and 600# sandpaper to sand the cured coating respectively;

[0079] 6) Continue to apply the wood paint prepared in Example 1 by forward and reverse roller coating, with a coating amount of 45 g / m 2 , this layer of wood paint has a skin-feel effect, which can give the coating a soft touch;

[0080] 7) Use a mercury lamp to pre-cure the applied skin-feel topcoat with a curing energy of 60mJ / cm 2 ;

[0081] 8) Use excimer curing technology to further cure the pre-cured wood paint to form a matte film with a skin-feeling effect, so that the coating has a better touch and visual effect;

[0082] 9) Fully cure the final coating using a mercury lamp with a curing energy of 400mJ / cm 2 , ensure that the coating is fully cured to form a stable and hard protective film.

[0083] Example 4

[0084] This example provides an application of a wood coating suitable for EB curing, the steps comprising:

[0085] 1) Use roller coating to evenly apply a layer of UV yellowing resistant adhesion primer on the surface of the melamine board, with a coating amount of 20g / m 2 ;

[0086] 2) Use a mercury lamp to semi-dry cure the UV yellowing-resistant adhesion primer after coating, with a curing energy of 200mJ / cm 2 , so that the UV yellowing resistant adhesion primer is partially cured;

[0087] 3) Apply a layer of UV yellowing resistant sanding primer on the surface of the melamine board by forward and reverse roller coating, with a coating amount of 40g / m 2 This layer of UV yellowing resistant sanding primer has a sanding effect, which can improve the adhesion and flatness of subsequent wood paint;

[0088] 4) Use a mercury lamp to fully cure the UV yellowing resistant sanding primer after coating, and the curing energy is 300mJ / cm 2 , ensure that the UV yellowing resistant sanding primer is fully cured to form a hard coating;

[0089] 5) Use 400# and 600# sandpaper to sand the cured coating respectively;

[0090] 6) Continue to apply the wood paint prepared in Example 1 by forward and reverse roller coating, with a coating amount of 45 g / m 2 , this layer of wood paint has a skin-feel effect, which can give the coating a soft touch;

[0091] 7) Use a mercury lamp to pre-cure the applied skin-feel topcoat with a curing energy of 60mJ / cm 2 ;

[0092] 8) Use excimer curing technology to further cure the pre-cured wood paint to form a matte film with a skin-feeling effect, so that the coating has a better touch and visual effect;

[0093] 9) Use gallium lamp to fully cure the final coating with a curing energy of 400mJ / cm 2 , ensure that the coating is fully cured to form a stable and hard protective film.

[0094] Example 5

[0095] This example provides an application of a wood coating suitable for EB curing, the steps comprising:

[0096] 1) Use roller coating to evenly apply a layer of UV yellowing resistant adhesion primer on the surface of the melamine board, with a coating amount of 20g / m 2 ;

[0097] 2) Use a mercury lamp to semi-dry cure the UV yellowing-resistant adhesion primer after coating, with a curing energy of 200mJ / cm 2 , so that the UV yellowing resistant adhesion primer is partially cured;

[0098] 3) Apply a layer of UV yellowing resistant sanding primer on the surface of the melamine board by forward and reverse roller coating, with a coating amount of 40g / m 2 This layer of UV yellowing resistant sanding primer has a sanding effect, which can improve the adhesion and flatness of subsequent wood paint;

[0099] 4) Use a mercury lamp to fully cure the UV yellowing resistant sanding primer after coating, and the curing energy is 300mJ / cm 2 , ensure that the UV yellowing resistant sanding primer is fully cured to form a hard coating;

[0100] 5) Use 400# and 600# sandpaper to sand the cured coating respectively;

[0101] 6) Continue to apply the wood paint prepared in Example 1 by forward and reverse roller coating, with a coating amount of 45 g / m 2 , this layer of wood paint has a skin-feel effect, which can give the coating a soft touch;

[0102] 7) Use a mercury lamp to pre-cure the applied skin-feel topcoat with a curing energy of 60mJ / cm 2 ;

[0103] 8) Use excimer curing technology to further cure the pre-cured wood paint to form a matte film with a skin-feeling effect, so that the coating has a better touch and visual effect;

[0104] 9) The final coating is fully cured using EB curing agent with an electron beam dose of 80KGy to ensure that the coating is fully cured to form a stable and hard protective film.

[0105] The above-mentioned UV yellowing resistant adhesion primer and UV yellowing resistant adhesion primer are both common commercially available products.

[0106] Performance Evaluation

[0107] Test object: coating of wood paint prepared in Examples 2-5.

[0108] The test methods of Examples 2-5 are detailed in Table 1.

[0109] The test results of Examples 2-5 are shown in Table 2.

[0110] Table 1

[0111]

[0112]

[0113]

[0114] Table 2

[0115]

[0116]

[0117] Conclusion: Compared with the curing by LED lamp, gallium lamp and mercury lamp, the wood paint provided by the present invention has better yellowing resistance, higher hardness, better paint film flexibility, more thorough curing and lower odor after being cured by EB curing.

Claims

1. A wood paint suitable for EB curing, characterized in that: The preparation raw materials include: polyurethane acrylate, epoxy acrylate, active diluent, acrylate leveling agent, light stabilizer, photoinitiator, radiation curing leveling agent, wetting agent and organic silicon leveling agent.

2. The wood coating suitable for EB curing according to claim 1, characterized in that: The raw materials for preparation include, by weight: 20-40 parts of polyurethane acrylate, 40-50 parts of epoxy acrylate, 10-30 parts of active diluent, 1-3 parts of acrylate leveling agent, 0.1-0.5 parts of light stabilizer, 0.3-1 parts of photoinitiator, 1-5 parts of radiation curing leveling agent, 0.3-1 parts of wetting agent and 0.1-0.2 parts of silicone leveling agent.

3. The wood paint suitable for EB curing according to claim 1, characterized in that: The brands of the polyurethane acrylate include: one or more of Etercure 6145-100, Etercure 6196-100, ETERCURE 5188, and Etercure DR-W402S.

4. The wood paint suitable for EB curing according to claim 3, characterized in that: The mass ratio of the polyurethane acrylates of Etercure 6145-100 and Etercure 6196-100 is (1-2):

1.

5. The wood paint suitable for EB curing according to any one of claims 1 to 4, characterized in that The viscosity of the epoxy acrylate at 25° C. is 30,000-60,000 mPa.s.

6. The wood coating suitable for EB curing according to claim 1, characterized in that: The active diluent includes one or more of TPGDA, HDDA, DPGDA, PEGDA, ACMO, PPTTA, and DPHA.

7. The wood coating suitable for EB curing according to claim 6, characterized in that: The active diluent includes TPGDA and HDDA; the mass ratio of TPGDA to HDDA is (1-2):

1.

8. The wood coating suitable for EB curing according to claim 1, characterized in that: The brands of the radiation curing leveling agent include: EBECRYL 1360 and / or TEGO Rad 2700.

9. A method for preparing a wood coating suitable for EB curing according to any one of claims 1 to 8, characterized in that: include: S1. Add polyurethane acrylate, epoxy acrylate and reactive diluent in sequence, and stir and disperse at 400-600 rpm for 10-15 minutes to make them completely dispersed; S2. Add acrylic leveling agent and light stabilizer, and continue to stir and disperse at 400-600 rpm for 5-10 minutes to make them completely dispersed; S3, add photoinitiator, continue stirring and dispersing at 600-800 rpm for 15-20 min, and control the particle size in the system to be ≤25 μm; S4. Add radiation curing leveling agent, wetting agent and silicone leveling agent, continue stirring and dispersing at 400-600 rpm for 5-10 minutes to make it completely dispersed, and then cool to room temperature.

10. A use of a wood paint suitable for EB curing according to any one of claims 1 to 8, characterized in that: The application steps include: applying the wood paint on the substrate and performing EB curing.

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