Coating composition and application thereof in pencil preparation

Abstract

The invention relates to the technical field of coatings, and particularly discloses a coating composition and application thereof in pencil preparation. The coating composition provided by the invention comprises the following film-forming components: epoxy acrylate, urethane acrylate and acrylate, the acrylic ester is HA507-1 light-cured acrylic ester of Haomiao New Material Science and Technology Co., Ltd., and the mass percent of the acrylic ester in the coating composition is 3-5%. The coating composition disclosed by the invention is high in fullness, good in leveling, rapid to cure, excellent in chemical resistance and free of any organic volatile solvent, so that environmental pollution and harm to a human body are reduced; and the coating manufacturing time of a single pencil can be shortened to 5min, so that the construction efficiency of a factory is greatly improved, and the labor cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, in particular to a coating composition and application thereof in the preparation of pencils. Background Art

[0002] In the early stage, the coating system used in the entire pencil paint market was the NC product system. In recent years, due to everyone's attention to environmental protection, the coating system used for pencil paint has gradually shifted from the NC product system to the water-based product system; for example, Chinese patents CN110964384A "A quick-drying nitro-based pencil paint and its preparation method and application" and CN112852224A "Anti-slip pencil paint and the process of producing coated pencils using it" both contain a large amount of solvents, which will release a large amount of VOCs during the construction process, causing damage to the environment, so nitro-based coating products are gradually being eliminated by the market. Water-based paint has gradually replaced nitro products in pencil paint, for example, Chinese patents CN113512329A "Water-based quick-drying pencil paint, black paint, silver paint and preparation method thereof", CN115058163A "Water-based skin-like pencil paint and preparation method thereof", CN109852249A "Water-based pencil paint and production process thereof", CN11081918A "A quick-drying water-based pencil paint toning topcoat and preparation method thereof", etc. However, from market research, it can be seen that water-based paint only reduces VOC emissions but still damages the environment. At the same time, water-based paint has high requirements for a dry environment, which affects the construction efficiency of the factory.

[0003] Therefore, further research on lacquers that can be used on pencils is still necessary. Summary of the invention

[0004] One of the purposes of the present invention is to provide a coating composition with "zero" VOC emission, high fullness, good leveling, good chemical resistance, excellent hand feel and high construction efficiency.

[0005] The present invention provides a coating composition, wherein the film-forming components of the coating composition include: epoxy acrylate, polyurethane acrylate and acrylate; the acrylate is HA507-1 photocurable acrylate produced by Haohui New Material Technology Co., Ltd., and the mass percentage of the acrylate in the coating composition is 3-5% (preferably, 4.5-5%).

[0006] In the prior art, it takes about 2 hours to make a pencil with nitro paint products, while the production time with water-based paint needs to be doubled, which takes about 4 hours; and the existing paints contain organic volatile solvents, which are easy to cause environmental pollution and harm to the human body.

[0007] The present invention has been found through research that when a specific light-curing acrylate is combined with other conventional molding components (epoxy acrylate and polyurethane acrylate) in a specific ratio in a coating composition, the flexibility, light and color retention, and chemical resistance of the paint film formed by the coating can be improved through the specific mutual reaction of the three, and the construction tolerance of the product can be improved, so that the paint film can be re-coated without adverse phenomena. In addition, the present invention changes the film-forming method of the traditional coating composition used for pencil paint, and can adopt a light-curing method to complete the construction of the pencil in about 5 minutes, saving time and cost. In addition, the coating composition of the present invention does not contain organic volatile solvents, and has "zero" VOC release, which truly realizes the environmental protection and pollution-free requirements of green coatings. In addition, the specific light-curing acrylate of the present invention is combined with epoxy acrylate and polyurethane acrylate to make the cross-linking effect of the system proper, ensure the adhesion of the paint film, and make it easy to make each auxiliary agent evenly dispersed in the system to ensure the uniformity of the product coating.

[0008] In the coating composition of the present invention, the polyurethane acrylate is hexafunctional polyurethane acrylate.

[0009] Preferably, the molecular formula of the epoxypropylene ester used in the present invention is C 27 H 32 O8; standard molecular weight is 484.538. Polyurethane acrylate is prepared by polymerization of aliphatic polyacetate and acrylate monomers, with a molecular formula of C 29 H 50 N2O 10 , CAS number is 68987-79-1.

[0010] The coating composition of the present invention comprises: 30-50 parts by weight of epoxy acrylate, 20-40 parts by weight of polyurethane acrylate, 3-5 parts by weight of acrylate, 0.5-1 parts by weight of dispersant, 0.1-0.5 parts by weight of defoamer, 0.1-0.5 parts by weight of leveling agent, 0.3-1 parts by weight of anti-settling agent, 2-5 parts by weight of photoinitiator auxiliary agent, 2-6 parts by weight of filler, 0-5 parts by weight of color paste, and 1-5 parts by weight of multifunctional active diluent; Preferably, it includes 38-40 parts by weight of epoxy acrylate, 40-42 parts by weight of polyurethane acrylate, 4-5 parts by weight of acrylate, 0.5-0.6 parts by weight of dispersant, 0.1-0.2 parts by weight of defoamer, 0.2-0.3 parts by weight of leveling agent, 0.5-0.6 parts by weight of anti-settling agent, 4-5 parts by weight of photoinitiator auxiliary, 2-6 parts by weight of filler, 4-5 parts by weight of color paste, and 2-5 parts by weight of multifunctional active diluent. In the coating composition of the present invention, the dispersant is a modified polyurethane with a solid content of ≥50%; the defoamer is an ether-modified silicone defoamer or a non-silicone defoamer; the leveling agent is one or more of a fluorocarbon-modified polyacrylate leveling agent, a polyether-modified silicone oil leveling agent or an acrylate copolymer leveling agent; the anti-settling agent is fumed silica or organic bentonite; the photoinitiator aid is a cleavage-type free radical photoinitiator aid and / or an active amine; and the multifunctional active diluent is one or more of propylene glycol diacrylate, trimethylolpropane triacrylate or tripropylene glycol diacrylate.

[0011] In the coating composition of the present invention, the filler is one or more of titanium dioxide, color powder, talcum powder, transparent powder and calcium carbonate; and the color paste is a UV type color paste.

[0012] The color paste selected by the present invention can participate in the cross-linking reaction, has good color brightness and adhesion, and does not contain organic volatile solvents.

[0013] The coating composition of the present invention can be prepared by conventional methods in the art. Preferably, the present invention also provides a method for preparing the coating composition, which comprises: 1) Mixing polyurethane acrylate, epoxy acrylate, acrylate and part of multifunctional active diluent; 2) Add dispersant, defoamer, leveling agent and photoinitiator and mix; 3) Add anti-settling agent and filler and mix until the dispersion fineness is ≤50μm; Optionally, after step 3), a step of adding color paste and mixing is also included; 4) Add the remaining multifunctional active diluent and mix.

[0014] More preferably, in the method of the present invention, the mixing conditions in step 1) are: stirring at a speed of 600-800 r / min for 10-15 min; The mixing conditions in step 2) are: stirring at a speed of 800-1000 r / min for 5-10 min; The mixing conditions in step 3) are: stirring at a speed of 800-1200 r / min for 30-35 min; The mixing conditions in step 4) are: dispersing at a speed of 600-800 r / min for 5-10 min.

[0015] In the method of the present invention, the mixing conditions after adding the color paste are: dispersing at a speed of 600-800 r / min for 5 minutes.

[0016] The present invention also provides the application of the coating composition or method in preparing pencils; Preferably, the pencil is prepared by coating the coating composition or the coating composition prepared by the above coating composition or method onto a wooden body of the pencil and then curing the pencil with a UV lamp; More preferably, the coating is performed 4 times, with each coating amount being 20±2 g / m 2 , after the first 3 coats, the curing energy is 100-150mj / cm 2 UV semi-curing, after the last coating, the curing energy is 200-300mj / cm 2 UV curing is performed.

[0017] The present invention also provides a pencil, which comprises the above coating composition or a cured paint layer of the coating composition prepared by the above method.

[0018] The beneficial effects of the present invention are at least: The coating composition of the present invention is a 100% solid product with high fullness, good leveling, rapid curing, good chemical resistance, and does not contain any organic volatile solvent, thereby reducing environmental pollution and harm to human body; and the production time of a single pencil coating can be shortened to 5 minutes, thereby greatly improving factory construction efficiency and saving labor costs. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention will be described in detail below in conjunction with examples. It should be understood that the following examples are provided only for the purpose of illustration and are not intended to limit the scope of the present invention. Those skilled in the art may make various modifications and substitutions to the present invention without departing from the purpose and spirit of the present invention.

[0020] The experimental methods used in the following examples are conventional methods unless otherwise specified. The materials, reagents, etc. used in the following examples are commercially available or prepared according to conventional methods in the art unless otherwise specified.

[0021] The polyurethane acrylate used in the specific implementation of the present invention is UV7200 aromatic polyurethane acrylate from Fenghu Chemical Materials, the epoxy acrylate is SM6105-80 from Sanmu Chemical Co., Ltd., and the acrylate is HA507-1 light-curing acrylate from Haohui New Materials Technology Co., Ltd.

[0022] In the present invention, the defoamer can be the polymer defoamer BYK-053 produced by German BYK Company without silicone or the non-silicone defoamer HX-2300 of Guangzhou Huaxia Chemical Group; the leveling agent can be the acrylate copolymer leveling agent BYK358N produced by German BYK Company or the polyether modified silicone oil leveling agent HX-3130 of Guangzhou Huaxia Chemical Group; the dispersant can be the modified polyurethane dispersant EFKA4010 produced by German BASF Company or BYK111 produced by German BYK Company. The anti-settling agent can be fumed silica or organic bentonite, and A-200 produced by Degussa of Germany and bentonite CD-1 produced by Deqian Chemical Co., Ltd. are selected; the filler can be talcum powder or transparent powder, selected from 1000 mesh talcum powder produced by Guangxi Longsheng Huamei Talc Development Co., Ltd., TP1250 talcum powder produced by Guangxi Guilin Superfine Powder Co., Ltd., and 1250 mesh transparent powder (TM-2500) of Foshan Housheng Chemical Co., Ltd.; the color paste can be UV type color paste that can participate in the cross-linking reaction of the paint film, and UV red paste, UV yellow paste, UV black paste, and UV blue paste produced by Zhuhai Zhanchen New Materials Co., Ltd. are selected; the photoinitiator auxiliary agent can be 819 of Guangdong Gurun New Materials and TPO of Tianjin Jiuri Chemical; the multifunctional active diluent is EM231\EM231-TF (TMPTA) and EM222 / EM222-TF (DPGDA) of Changxing Chemical.

[0023] Example 1

[0024] This embodiment provides a preparation of a photocurable paint (coating composition), which is as follows: 1) Accurately weigh 39 parts of epoxy acrylate, 5 parts of light-curing acrylate, 40 parts of polyurethane acrylate and 3 parts of multifunctional active diluent (EM231-TF) and put them into the reactor, and stir at a speed of 800 r / min for 10 minutes; 2) Slowly add 0.2 parts of defoamer (HX-2300 produced by Guangzhou Huaxia Chemical), 0.3 parts of leveling agent (BYK358N produced by BYK, Germany), 0.5 parts of dispersant (EFKA4010 produced by BASF, Germany), 1 part of photoinitiator (819 produced by Guangdong Gurun New Materials), 3 parts of photoinitiator (TPO produced by Tianjin Jiuri Chemical) and stir at 800r / min for 10 minutes; 3) Slowly add 3 parts of transparent powder (Foshan Housheng Chemical Co., Ltd., TM-2500), 3 parts of talcum powder (Guangxi Longsheng Huamei Talc Development Co., Ltd., 1000 mesh), 0.6 parts of fumed silica anti-settling agent (German Degussa, A-200), and stir at a speed of 1200r / min for 30min until the fineness is ≤50μm; 4) Slowly add 1.4 parts of multifunctional active diluent (EM222 from Changxing Chemical) and disperse at a speed of 600 r / min for 10 minutes to obtain sample #1.

[0025] Example 2

[0026] This embodiment provides a preparation method of a light-curing paint, which is as follows: 1) Accurately weigh 39 parts of epoxy acrylate, 5 parts of light-curing acrylate, 42 parts of polyurethane acrylate and 1 part of multifunctional active diluent (EM222-TF) and put them into the reactor, and stir at a speed of 800 r / min for 10 minutes; 2) Slowly add 0.2 parts of defoamer (BYK053 produced by BYK, Germany), 0.3 parts of leveling agent (BYK358N produced by BYK, Germany), 0.5 parts of dispersant (EFKA4010 produced by BASF, Germany), 1 part of photoinitiator (819 produced by Guangdong Gurun New Materials), 3 parts of photoinitiator (TPO produced by Tianjin Jiuri Chemical) and stir at 800r / min for 10 minutes; 3) Slowly add 1 part of transparent powder (Foshan Housheng Chemical Co., Ltd., TM-2500), 1 part of talcum powder (Guangxi Longsheng Huamei Talc Development Co., Ltd., 1000 mesh), 0.6 part of fumed silica anti-settling agent (German Degussa, A-200), and stir at a speed of 1200r / min for 30min until the fineness is ≤50μm; 4) Slowly add 4 parts of UV black slurry (Zhuhai Zhanchen New Materials Co., Ltd.) and disperse at a speed of 600r / min for 5 minutes; 5) Slowly add 2 parts of multifunctional active diluent (EM222 from Changxing Chemical) and disperse at a speed of 600 r / min for 10 minutes to obtain sample 2#.

[0027] Example 3

[0028] This embodiment provides a preparation method of a light-curing paint, which is as follows: 1) Accurately weigh 39 parts of epoxy acrylate, 5 parts of light-curing acrylate, 42 parts of polyurethane acrylate and 1 part of multifunctional active diluent (EM231 of Changxing Chemical) and put them into the reactor, and stir at a speed of 800r / min for 10min; 2) Slowly add 0.2 parts of defoamer (HX-2300 produced by Guangzhou Huaxia Chemical), 0.3 parts of leveling agent (BYK358N produced by German BYK), 0.5 parts of dispersant (BYK111 produced by German BYK), 1 part of photoinitiator (819 produced by Guangdong Gurun New Materials), 3 parts of photoinitiator (TPO produced by Tianjin Jiuri Chemical) and stir at 800r / min for 10 minutes; 3) Slowly add 1 part of transparent powder (Foshan Housheng Chemical Co., Ltd., TM-2500), 1 part of talcum powder (Guangxi Longsheng Huamei Talc Development Co., Ltd., 1000 mesh), 0.6 part of fumed silica anti-settling agent (German Degussa, A-200), and stir at 1200r / min for 30min until the fineness is ≤50μm; 4) Slowly add 5 parts of UV red slurry (Zhuhai Zhanchen New Materials Co., Ltd.) and disperse at a speed of 600r / min for 5 minutes; 5) Slowly add 1 part of multifunctional active diluent (EM222 from Changxing Chemical) and disperse at a speed of 600 r / min for 10 minutes to obtain sample 3#.

[0029] Example 4

[0030] This embodiment provides a preparation method of a light-curing paint, which is as follows: 1) Accurately weigh 39 parts of epoxy acrylate, 5 parts of light-curing acrylate, 42 parts of polyurethane acrylate and 1 part of multifunctional active diluent (EM231 of Changxing Chemical) and put them into the reactor, and stir at a speed of 800r / min for 10min; 2) Slowly add 0.2 parts of defoamer (HX-2300 produced by Guangzhou Huaxia Chemical), 0.3 parts of leveling agent (BYK358N produced by BYK, Germany), 0.5 parts of dispersant (EFKA4010 produced by BASF, Germany), 1 part of photoinitiator (819 produced by Guangdong Gurun New Materials), 3 parts of photoinitiator (TPO produced by Tianjin Jiuri Chemical) and stir at 800r / min for 10 minutes; 3) Slowly add 1 part of transparent powder (Foshan Housheng Chemical Co., Ltd., TM-2500), 1 part of talcum powder (Guangxi Longsheng Huamei Talc Development Co., Ltd., 1000 mesh), 0.6 part of fumed silica anti-settling agent (German Degussa, A-200), and stir at 1200r / min for 30min until the fineness is ≤50μm; 4) Slowly add 5 parts of UV yellow paste (Zhuhai Zhanchen New Materials Co., Ltd.) and disperse at a speed of 600r / min for 5 minutes; 5) Slowly add 1 part of multifunctional active diluent (EM222 from Changxing Chemical) and disperse at a speed of 600 r / min for 10 minutes to obtain sample 4#.

[0031] Example 5

[0032] This embodiment provides a preparation method of a light-curing paint, which is as follows: 1) Accurately weigh 39 parts of epoxy acrylate, 5 parts of light-curing acrylate, 42 parts of polyurethane acrylate and 1 part of multifunctional active diluent (EM231 of Changxing Chemical) and put them into the reactor, and stir at a speed of 800r / min for 10min; 2) Slowly add 0.2 parts of defoamer (HX-2300 produced by Guangzhou Huaxia Chemical), 0.3 parts of leveling agent (HX-3130 produced by Guangzhou Huaxia Chemical), 0.5 parts of dispersant (EFKA4010 produced by BASF, Germany), 1 part of photoinitiator (819 produced by Guangdong Gurun New Materials), 3 parts of photoinitiator (TPO produced by Tianjin Jiuri Chemical) and stir at 800r / min for 10 minutes; 3) Slowly add 1 part of transparent powder (Foshan Housheng Chemical Co., Ltd., TM-2500), 1 part of talcum powder (Guangxi Longsheng Huamei Talc Development Co., Ltd., 1000 mesh), 0.6 part of fumed silica anti-settling agent (German Degussa, A-200), and stir at a speed of 1200r / min for 30min until the fineness is ≤50μm; 4) Slowly add 5 parts of UV blue slurry (Zhuhai Zhanchen New Materials Co., Ltd.) and disperse at a speed of 600r / min for 5 minutes; 5) Slowly add 1 part of multifunctional active diluent (EM222 from Changxing Chemical) and disperse at a speed of 600 r / min for 10 minutes to obtain sample 5#.

[0033] Comparative Example 1

[0034] This comparative example provides a preparation method of a photocurable paint, which is basically the same as the preparation method of Example 2, except that the ZC5601A photocurable acrylate produced by Zicai Chemical Co., Ltd. is used instead of the HA507-1 photocurable acrylate produced by Haohui New Material Technology Co., Ltd.

[0035] Comparative Example 2

[0036] This comparative example provides a preparation method of a photocurable paint, which is basically the same as the preparation method of Example 2, except that HA505 photocurable acrylate of Haohui New Material Technology Co., Ltd. is used instead of HA507-1 photocurable acrylate of Haohui New Material Technology Co., Ltd.

[0037] Comparative Example 3

[0038] This comparative example provides a preparation method of a photocurable paint, which is basically the same as the preparation method of Example 2, except that the HM3611 photocurable acrylate produced by Jiangxi Kunlong New Materials Co., Ltd. is used instead of the HA507-1 photocurable acrylate produced by Haohui New Materials Technology Co., Ltd.

[0039] Experimental Example 1

[0040] In this experimental example, the paints prepared in the embodiments and comparative examples were tested according to the standard HG / T3655-2012 "Ultraviolet (UV) Curing Wood Coatings". The test results are shown in Tables 1 and 2 below.

[0041] Table 1

[0042] Table 2

[0043] Example 6

[0044] In this embodiment, the sample oil (varnish) made in the above embodiments is coated on a pencil according to the process of Table 3.

[0045] Table 3

[0046] Experimental Example 2

[0047] In this experimental example, a pencil made in Example 6 and finished pencils made with water-based paint and nitro paint on the market were randomly selected to perform various performance tests. The results are shown in Table 4.

[0048] Table 4

[0049] From the above results, it can be seen that the performance of the products made by the light-curing coating method of the present invention is comparable to that of the products made by water-based coating and nitro coating, but the resistance is better; the light-curing coating does not contain any organic solvent, which greatly reduces environmental pollution and physical harm to personnel; and the production time of a single pencil is shortened from 4 hours to 5 minutes, which greatly improves the factory construction efficiency, saves labor costs, and achieves energy saving and efficiency improvement.

[0050] Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made thereto based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A coating composition, characterized in that The film-forming components of the coating composition include: epoxy acrylate, polyurethane acrylate and acrylate; the acrylate is HA507-1 photocurable acrylate produced by Haohui New Material Technology Co., Ltd., and its mass percentage in the coating composition is 3-5%.

2. The coating composition according to claim 1, characterized in that The polyurethane acrylate is hexafunctional polyurethane acrylate.

3. The coating composition according to claim 1 or 2, characterized in that include: 30-50 parts by weight of epoxy acrylate, 20-42 parts by weight of polyurethane acrylate, 3-5 parts by weight of acrylate, 0.5-1 parts by weight of dispersant, 0.1-0.5 parts by weight of defoamer, 0.1-0.5 parts by weight of leveling agent, 0.3-1 parts by weight of anti-settling agent, 2-5 parts by weight of photoinitiator auxiliary, 2-6 parts by weight of filler, 0-5 parts by weight of color paste, 1-5 parts by weight of multifunctional active diluent; Preferably, it includes 38-40 parts by weight of epoxy acrylate, 40-42 parts by weight of polyurethane acrylate, 4-5 parts by weight of acrylate, 0.5-0.6 parts by weight of dispersant, 0.1-0.2 parts by weight of defoamer, 0.2-0.3 parts by weight of leveling agent, 0.5-0.6 parts by weight of anti-settling agent, 4-5 parts by weight of photoinitiator auxiliary, 2-6 parts by weight of filler, 4-5 parts by weight of color paste, and 2-5 parts by weight of multifunctional active diluent.

4. The coating composition according to claim 3, characterized in that The dispersant is a modified polyurethane with a solid content of ≥50%; the defoamer is an ether-modified silicone defoamer or a non-silicone defoamer; the leveling agent is one or more of a fluorocarbon-modified polyacrylate leveling agent, a polyether-modified silicone oil leveling agent or an acrylate copolymer leveling agent; the anti-settling agent is fumed silica or organic bentonite; the photoinitiator aid is a cleavage-type free radical photoinitiator aid and / or an active amine; and the multifunctional active diluent is one or more of propylene glycol diacrylate, trimethylolpropane triacrylate or tripropylene glycol diacrylate.

5. The coating composition according to claim 3 or 4, characterized in that: The filler is one or more of titanium dioxide, color powder, talcum powder, transparent powder, and calcium carbonate; and the color paste is a UV type color paste.

6. A method for preparing the coating composition according to any one of claims 1 to 5, characterized in that: include: 1) Mixing polyurethane acrylate, epoxy acrylate, acrylate and part of multifunctional active diluent; 2) Add dispersant, defoamer, leveling agent and photoinitiator and mix; 3) Add anti-settling agent and filler and mix until the dispersion fineness is ≤50μm; Optionally, after step 3), a step of adding color paste and mixing is also included; 4) Add the remaining multifunctional active diluent and mix.

7. The method according to claim 6, characterized in that The mixing conditions in step 1) are: stirring at a speed of 600-800 r / min for 10-15 min; The mixing conditions in step 2) are: stirring at a speed of 800-1000 r / min for 5-10 min; The mixing conditions in step 3) are: stirring at a speed of 800-1200 r / min for 30-35 min; The mixing conditions in step 4) are: dispersing at a speed of 600-800 r / min for 5-10 min.

8. The method according to claim 6 or 7, characterized in that: The mixing conditions after adding the color paste are: dispersing at a speed of 600-800r / min for 5 minutes.

9. Use of the coating composition according to any one of claims 1 to 5 or the method according to any one of claims 6 to 8 in preparing a pencil; Preferably, the pencil is prepared by applying the coating composition according to any one of claims 1 to 5 or the coating composition prepared by the method according to any one of claims 6 to 8 to the outside of the wooden body of the pencil, and then curing it with a UV lamp; More preferably, the coating is performed 4 times, with each coating amount being 20±2 g / m 2 , after the first 3 coats, the curing energy is 100-150mj / cm 2 UV semi-curing, after the last coating, the curing energy is 200-300mj / cm 2 UV curing is performed.

10. A pencil, characterized in that: The paint layer comprises the paint composition according to any one of claims 1 to 5 or the paint composition prepared by the method according to any one of claims 6 to 8 after being cured.

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