Ultraviolet curing coating with flashing sand effect as well as preparation method and application of ultraviolet curing coating

Abstract

The invention discloses an ultraviolet curing coating with a flashing sand effect as well as a preparation method and application thereof, and belongs to the technical field of photocuring coatings. The coating comprises a coating main agent and a composite diluent, the coating main agent comprises the following components in parts by weight: 15-25 parts of acrylic resin A; 3-9 parts of acrylic resin B; 1-4 parts of acrylic resin C; 6-12 parts of acrylic resin D; 0.7 part of cellulose resin; 4-6 parts of a silicon dioxide delustering agent; 2-6 parts of micro powder; the composite diluent comprises at least two of ethylene glycol monobutyl ether, ethyl acetate, methyl isobutyl ketone, isopropanol, n-butyl alcohol and butyl acetate; the types of four acrylic resins and the mass ratio of the coating main agent to the composite diluent are limited. The ultraviolet curing coating disclosed by the invention has a good metal flashing effect and excellent wear resistance and transparency, has various conventional properties of the coating, and can meet the texture and performance requirements of electronic product shells after being sprayed on a workpiece sprayed with high-metal-feeling primer.

Description

Technical Field

[0001] The invention relates to the technical field of light-curing coatings, and in particular to an ultraviolet light-curing coating with a flashing sand effect, a preparation method thereof and an application thereof. Background Art

[0002] With the improvement of living standards, people have higher and higher requirements on the appearance of consumer electronic products. In the early years, many mobile phone shells were made of metal anodizing process, which has a good metallic texture and sparkles coolly under light. It has always been popular with consumers. However, metal material has a weakness, which is "heavy". In order to change this situation, R&D personnel changed the metal material to plastic, hoping to achieve a light and metallic and sparkling appearance of the mobile phone through painting.

[0003] The metallic glitter effect of the currently prepared metallic texture coating is not ideal, the transparency is poor, and there is also the problem of poor wear resistance. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a UV-curable coating with a flash sand effect, a preparation method thereof, and an application thereof. The UV-curable coating of the present invention has a good metallic flash effect, excellent wear resistance and transparency, and has various conventional properties of coatings. When sprayed on a workpiece sprayed with a high metallic primer, the UV-curable coating can meet the texture and performance requirements of the electronic product housing, and can give people a cool and high-quality life experience, and has a high market development value.

[0005] The technical solution of the present invention is as follows:

[0006] The first aspect of the present invention provides a flash sand effect ultraviolet curing coating, comprising a coating main agent and a composite diluent;

[0007] The coating main agent comprises, by weight: 15-25 parts of acrylic resin A; 3-9 parts of acrylic resin B; 1-4 parts of acrylic resin C; 6-12 parts of acrylic resin D; 0.7 parts of cellulose resin, 4-6 parts of silicon dioxide matting agent; 2-6 parts of micro powder;

[0008] The composite diluent includes at least two of ethylene glycol monobutyl ether, ethyl acetate, methyl isobutyl ketone, isopropanol, n-butanol, and butyl acetate;

[0009] The acrylic resin A is polyurethane acrylate;

[0010] The acrylic resin B is an aliphatic polyurethane acrylic resin;

[0011] The acrylic resin C is an epoxy-modified acrylic resin;

[0012] The acrylic resin D is a solvent-based acrylic resin;

[0013] The mass ratio of the coating main agent to the composite diluent is 100:40-50.

[0014] Preferably, in the coating main agent, the acrylic resin A is a hexafunctional polyurethane acrylate; preferably, the acrylic resin A includes B-6105 of Boxing;

[0015] And / or, the acrylic resin B is a trifunctional aliphatic polyurethane acrylic resin; preferably, the acrylic resin B includes BW8006 of Bahe;

[0016] And / or, the acrylic resin C is a difunctional epoxy-modified acrylic resin, preferably, the acrylic resin C includes B-1603 of Boxing;

[0017] And / or, the acrylic resin D is a tetrafunctional solvent-based acrylic resin; preferably, the acrylic resin D includes Changxing's 6071;

[0018] The cellulose resin includes CAB-381-20 from EASTMEN.

[0019] Preferably, in the coating main agent, the silica matting agent has a particle size of 1.2-1.6 μm and a specific surface area of ​​120-160 m 2 / g;

[0020] And / or, the D50 particle size of the micropowder is 3.0-4.0 μm.

[0021] Preferably, in the coating main agent, the silica matting agent includes E-1011 of Tosoh Chemical;

[0022] And / or, the micro powder includes EXP8018-1 produced by Evonik.

[0023] Preferably, the coating main agent further comprises the following components in parts by weight:

[0024] 1.2-2.0 parts of photoinitiator, 0.5 parts of dispersant, 0.2 parts of anti-fouling agent, 2.0 parts of anti-settling agent, 50.3-60.3 parts of composite diluent I.

[0025] Preferably, the photoinitiator comprises double-bond chemically 1-hydroxycyclohexyl phenyl ketone;

[0026] And / or, the dispersant comprises BYK-2008 of BYK Chemical;

[0027] And / or, the anti-fouling agent includes L8315 from Tianlong Chemical.

[0028] Preferably, the anti-settling agent comprises NS-5500 of Desbaron; and / or, the composite diluent I is the same as the composite diluent.

[0029] Preferably, the composite diluent comprises the following components in parts by weight: 5-10 parts of ethylene glycol monobutyl ether; 50-60 parts of ethyl acetate; 2-5 parts of methyl isobutyl ketone; 8-12 parts of isopropanol; 5-10 parts of n-butanol; and 12-18 parts of butyl acetate.

[0030] The second aspect of the present invention provides a method for preparing the UV-curable coating of the first aspect, the method comprising the following steps:

[0031] S1: 5-10 parts of ethylene glycol monobutyl ether, 50-60 parts of ethyl acetate, 2-5 parts of methyl isobutyl ketone, 8-12 parts of isopropanol, 5-10 parts of n-butanol and 12-18 parts of butyl acetate are fully mixed to obtain a composite diluent or composite diluent I for standby use;

[0032] S2: prepare the main agent;

[0033] S2-1 Add 0.7 parts of cellulose resin to 6.3 parts of composite diluent I to dissolve into a cellulose solution;

[0034] S2-2: 1.2-2.0 parts of photoinitiator and 4 parts of composite diluent I are fully mixed and dissolved until clear, and then 15-25 parts of acrylic resin A, 3-9 parts of acrylic resin B, 1-4 parts of acrylic resin C, 6-12 parts of acrylic resin D, cellulose solution of step S2-1, 0.5 parts of dispersant, 0.2 parts of stain resistance aid, 2 parts of anti-settling agent are added, and after stirring and dispersing evenly, 4-6 parts of silica matting agent and 2-6 parts of micro powder are added after stirring and dispersing, and then dispersed at 800-1000r / min for 30min until the fineness is qualified, and finally 40-50 parts of composite diluent I are added, and the viscosity is adjusted to 16-20s to meet the requirements, and the coating main agent is obtained;

[0035] S3: mixing the coating main agent of step S2 and the composite diluent prepared in step S1 to obtain the ultraviolet light curing coating;

[0036] In step S3, the mass ratio of the coating main agent to the composite diluent is 100:40-50.

[0037] The third aspect of the present invention provides an application of the UV-curable coating described in the first aspect or the UV-curable coating prepared by the preparation method described in the second aspect, wherein the coating is used for spraying a workpiece, and the specific method of the application is:

[0038] The ultraviolet light curing coating is sprayed on a workpiece containing a primer to form a wet film, pre-baked, and then cured to obtain a coating film;

[0039] The pre-baking temperature is 50-55°C and the time is 5-8 minutes;

[0040] The curing adopts UVA curing;

[0041] The UVA curing energy is 700-1000mj / cm 2 ;

[0042] The coating film has a thickness of 18-23 μm.

[0043] The beneficial technical effects of the present invention are:

[0044] The invention compounds four different acrylic resins with cellulose resin and adds matting agent, micro powder and composite diluent, so that the coating obtained has good metallic flash effect, good transparency and better wear resistance.

[0045] The four acrylic resins used in the present invention cooperate with each other. The hexafunctional polyurethane acrylate can provide high hardness, high toughness, high wear resistance, good chemical resistance and high adhesion; the trifunctional aliphatic polyurethane acrylic resin has a large molecular weight, good chemical resistance and flexibility, and good matte powder arrangement; the introduction of the difunctional epoxy-modified acrylic resin can further improve the chemical resistance, replace part of the hexafunctional polyurethane acrylate, and can meet the performance requirements while reducing costs; the tetrafunctional solvent-based acrylic resin has good adhesion and good powder arrangement; the cellulose resin can provide strength and rigidity while cooperating with other resins to improve the dispersion arrangement of the powder; compared with traditional products, the introduction of the matting agent and micropowder improves the permeability of the coating, avoids the influence of the poor permeability of the coating on the metal flash effect, achieves the metal flashing effect, and improves the wear resistance. The matting agent used can provide better transparency, and then cooperates with the differential to further improve the flash effect. The coating made from the prepared paint not only has good mechanical properties and wear resistance, but also has excellent chemical resistance and transparency, and also has a metallic flash effect.

[0046] The coating prepared by the invention is convenient to construct, has fast light-curing film formation, is widely used, can be directly or indirectly sprayed on various electronic products, has good metallic flash effect, and also has the characteristics of good transparency and excellent wear resistance. DETAILED DESCRIPTION

[0047] The present invention will be described in detail below in conjunction with the embodiments.

[0048] The invention provides an ultraviolet light curing coating with a flash sand effect, a preparation method and an application thereof.

[0049] It is understandable that four main UV resins and one cellulose resin are selected in the coating main agent of the present invention, each of which has its own characteristics. Acrylic resin A is a hexafunctional polyurethane acrylate, which has the characteristics of high hardness, good toughness, wear resistance, good chemical resistance, and excellent adhesion. Acrylic resin B is a trifunctional aliphatic polyurethane acrylic resin with a large molecular weight, good chemical resistance and flexibility, and good matte powder arrangement. Acrylic resin C is a difunctional epoxy-modified acrylic resin, which has the characteristics of low cost and good chemical resistance.

[0050] It can be understood that the acrylic resin D used in the present invention is Changxing's 6071, which is a tetrafunctional solvent-based acrylic resin with good adhesion and good powder arrangement.

[0051] It is understood that the cellulose resin used in the present invention is EASTMEN's CAB-381-20, which is a branched cellulose resin and a resin that is good at arranging powders.

[0052] It can be understood that the anti-fouling agent used in the present invention has the characteristics of anti-fouling and good leveling.

[0053] It can be understood that the silicon dioxide matting agent used in the present invention has the characteristics of small particle size, good slippery feeling and good matting property.

[0054] It can be understood that the micro powder used in the present invention has the characteristics of small particle size, good permeability, good metal flashing effect and good wear resistance.

[0055] It is understandable that the anti-settling agent used in the present invention has the function of preventing the powder from settling.

[0056] It can be understood that the silica matting agent used in the present invention is E-1011 produced by Tosoh Chemical, which has the characteristics of small particle size, good transparency and good matting property.

[0057] The present invention will be further described below by way of examples.

[0058] Example 1

[0059] A flash sand effect ultraviolet curing paint comprises a paint main agent and a composite diluent.

[0060] The coating main agent includes, by weight, 20 parts of acrylic resin A, 6 parts of acrylic resin B, 2 parts of acrylic resin C, 9 parts of acrylic resin D, 0.7 parts of cellulose resin, 5.2 parts of silica matting agent, 2 parts of micropowder, 1.7 parts of photoinitiator, 0.5 parts of dispersant, 0.2 parts of stain resistance aid, 2 parts of anti-settling agent, and 50.7 parts of composite diluent I.

[0061] Among them, acrylic resin A is B-6105 from Boxing; acrylic resin B is BW8006 from Bahe; acrylic resin C is B-1603 from Boxing; acrylic resin D is 6071 from Changxing; cellulose resin is CAB-381-20 from EASTMEN; silica matting agent is E-1011 from Tosoh Chemical; micropowder is EXP8018-1 from Evonik; photoinitiator is 1-hydroxycyclohexyl phenyl ketone from Double Bond Chemical; dispersant is BYK-2008 from BYK Chemical; anti-fouling agent is L8315 from Tianlong Chemical; anti-settling agent is NS-5500 from Desbaron.

[0062] The composite diluent I is the same as the composite diluent. After the composite diluent is prepared and mixed, the required number of portions can be weighed.

[0063] The composite diluent is obtained by mixing 8 parts of ethylene glycol monobutyl ether, 57 parts of ethyl acetate, 2.5 parts of methyl isobutyl ketone, 10.5 parts of isopropanol, 7.5 parts of n-butanol and 14.5 parts of butyl acetate. When preparing the coating, just take the required number of parts.

[0064] The preparation method of the above-mentioned flash sand effect ultraviolet curing coating comprises the following steps:

[0065] (1) 8 parts of ethylene glycol monobutyl ether, 57 parts of ethyl acetate, 2.5 parts of methyl isobutyl ketone, 10.5 parts of isopropanol, 7.5 parts of n-butanol and 14.5 parts of butyl acetate are mixed thoroughly to obtain a composite diluent or composite diluent I, which is set aside and the required number of parts is taken as needed;

[0066] (2) First, 0.7 parts of cellulose resin is dissolved at high speed with 6.3 parts of composite diluent I to form a cellulose solution. Then, 1.7 parts of photoinitiator is fully mixed with 4 parts of composite diluent I and dissolved until clear. Then, 20 parts of acrylic resin A, 6 parts of acrylic resin B and 2 parts of acrylic resin C, 9 parts of acrylic resin D and the above cellulose solution, 0.5 parts of dispersant, 0.2 parts of stain resistance aid and 2 parts of anti-settling agent are added. After the mixture is uniformly dispersed at medium speed, 5.2 parts of silica matting agent and 2 parts of micro powder are added during the stirring. Then, the mixture is dispersed at a high speed of 900 r / min for about 30 minutes until the fineness is qualified. Finally, 40.4 parts of composite diluent I are added and the viscosity is adjusted to meet the requirements to obtain the main part of the coating.

[0067] (3) The coating main agent and the composite diluent are mixed in a weight ratio of 100:45 to obtain the flash sand violet light curing coating.

[0068] Example 2

[0069] A flash sand effect ultraviolet curing paint comprises a paint main agent and a composite diluent.

[0070] The coating main agent includes, by weight, 20 parts of acrylic resin A, 6 parts of acrylic resin B, 2 parts of acrylic resin C, 9 parts of acrylic resin D, 0.7 parts of cellulose resin, 5.2 parts of silica matting agent, 4 parts of micropowder, 1.7 parts of photoinitiator, 0.5 parts of dispersant, 0.2 parts of stain resistance additive, 2 parts of anti-settling agent, and 48.7 parts of composite diluent I.

[0071] Among them, acrylic resin A is B-6105 from Boxing; acrylic resin B is BW8006 from Bahe; acrylic resin C is B-1603 from Boxing; acrylic resin D is 6071 from Changxing; cellulose resin is CAB-381-20 from EASTMEN; silica matting agent is E-1011 from Tosoh Chemical; micropowder is EXP8018-1 from Evonik; photoinitiator is 1-hydroxycyclohexyl phenyl ketone from Double Bond Chemical; dispersant is BYK-2008 from BYK Chemical; stain resistance additive is L8315 from Tianlong Chemical; anti-settling agent is NS-5500 from Desbaron; composite diluent I is the same as the composite diluent, and the composite diluent can be prepared and weighed according to the required number of portions.

[0072] The composite diluent is obtained by mixing 8 parts of ethylene glycol monobutyl ether, 57 parts of ethyl acetate, 2.5 parts of methyl isobutyl ketone, 10.5 parts of isopropanol, 7.5 parts of n-butanol and 14.5 parts of butyl acetate. When preparing the coating, just take the required number of parts.

[0073] The preparation method of the above-mentioned flash sand effect ultraviolet curing coating comprises the following steps:

[0074] (1) Composite diluent: 8 parts of ethylene glycol monobutyl ether, 57 parts of ethyl acetate, 2.5 parts of methyl isobutyl ketone, 10.5 parts of isopropanol, 7.5 parts of n-butanol and 14.5 parts of butyl acetate are mixed thoroughly to obtain a composite diluent;

[0075] (2) First, 0.7 parts of cellulose resin is dissolved at high speed with 6.3 parts of composite diluent I to form a cellulose solution, and then 1.7 parts of photoinitiator is fully mixed with 4 parts of composite diluent I and dissolved until clear, and then 20 parts of acrylic resin A, 6 parts of acrylic resin B and 2 parts of acrylic resin C, 9 parts of acrylic resin D and the above cellulose solution, 0.5 parts of dispersant, 0.2 parts of stain resistance aid, and 2 parts of anti-settling agent are added, and after being dispersed uniformly at medium speed, 5.2 parts of silica matting agent and 4 parts of micro powder are added during stirring, and then dispersed at a high speed of 900 r / min for about 30 minutes until the fineness is qualified, and finally 38.4 parts of composite diluent I are added and the viscosity is adjusted to a qualified level to obtain the main part of the coating;

[0076] (3) The coating main agent and the composite diluent are mixed in a weight ratio of 100:45 to obtain the flash sand violet light curing coating.

[0077] Example 3

[0078] A flash sand effect ultraviolet curing paint comprises a paint main agent and a composite diluent.

[0079] The coating main agent includes, by weight, 20 parts of acrylic resin A, 6 parts of acrylic resin B, 2 parts of acrylic resin C, 9 parts of acrylic resin D, 0.7 parts of cellulose resin, 5.2 parts of silica matting agent, 6 parts of micropowder, 1.7 parts of photoinitiator, 0.5 parts of dispersant, 0.2 parts of stain resistance additive, 2 parts of anti-settling agent, and 46.7 parts of composite diluent I.

[0080] Among them, acrylic resin A is B-6105 from Boxing; acrylic resin B is BW8006 from Bahe; acrylic resin C is B-1603 from Boxing; acrylic resin D is 6071 from Changxing; cellulose resin is CAB-381-20 from EASTMEN; silica matting agent is E-1011 from Tosoh Chemical; micropowder is EXP8018-1 from Evonik; photoinitiator is 1-hydroxycyclohexyl phenyl ketone from Double Bond Chemical; dispersant is BYK-2008 from BYK Chemical; stain resistance additive is L8315 from Tianlong Chemical; anti-settling agent is NS-5500 from Desbaron; composite diluent I is the same as the composite diluent, and the composite diluent can be prepared and weighed according to the required number of portions.

[0081] The composite diluent is obtained by mixing 8 parts of ethylene glycol monobutyl ether, 57 parts of ethyl acetate, 2.5 parts of methyl isobutyl ketone, 10.5 parts of isopropanol, 7.5 parts of n-butanol and 14.5 parts of butyl acetate. When preparing the coating, just take the required number of parts.

[0082] The preparation method of the above-mentioned flash sand effect ultraviolet curing coating comprises the following steps:

[0083] (1) 8 parts of ethylene glycol monobutyl ether, 57 parts of ethyl acetate, 2.5 parts of methyl isobutyl ketone, 10.5 parts of isopropanol, 7.5 parts of n-butanol and 14.5 parts of butyl acetate are mixed thoroughly to obtain a composite diluent or composite diluent I, which is set aside and the required number of parts is taken as needed;

[0084] (2) First, 0.7 parts of cellulose resin is dissolved at high speed with 6.3 parts of composite diluent to form a cellulose solution, and then 1.7 parts of photoinitiator is fully mixed with 4 parts of composite diluent and dissolved until clear, and then 20 parts of acrylic resin A, 6 parts of acrylic resin B and 2 parts of acrylic resin C, 9 parts of acrylic resin D and the above cellulose solution, 0.5 parts of dispersant, 0.2 parts of stain resistance aid, and 2 parts of anti-settling agent are added, and after uniform dispersion at medium speed, 5.2 parts of silica matting agent and 6 parts of micro powder are added during stirring, and then the mixture is dispersed at a high speed of 900 r / min for about 30 minutes until the fineness is qualified, and finally 36.4 parts of composite diluent are added and the viscosity is adjusted to meet the requirements to obtain the main part of the coating;

[0085] (3) The coating main agent and the composite diluent are mixed in a weight ratio of 100:45 to obtain the flash sand violet light curing coating.

[0086] Comparative Example 1

[0087] A UV curing coating comprises a coating main agent and a composite diluent.

[0088] The coating main agent includes, by weight, 20 parts of acrylic resin A, 6 parts of acrylic resin B, 2 parts of acrylic resin C, 9 parts of acrylic resin D, 0.7 parts of cellulose resin, 5.2 parts of silica matting agent, 4 parts of micropowder, 1.7 parts of photoinitiator, 0.5 parts of dispersant, 0.2 parts of stain resistance additive, 2 parts of anti-settling agent, and 48.7 parts of composite diluent I.

[0089] Among them, acrylic resin A is B-6105 from Boxing; acrylic resin B is BW8006 from Bahe; acrylic resin C is B-1603 from Boxing; acrylic resin D is 6071 from Changxing; cellulose resin is CAB-381-20 from EASTMEN; silica matting agent is E-1011 from Tosoh Chemical; micropowder is 5070D from Dainichi Seika; photoinitiator is 1-hydroxycyclohexyl phenyl ketone from Double Bond Chemical; dispersant is BYK-2008 from BYK Chemical; stain resistance additive is L8315 from Tianlong Chemical; anti-settling agent is NS-5500 from Desbaron; composite diluent I is the same as the composite diluent, and the composite diluent can be prepared and weighed according to the required number of portions.

[0090] The composite diluent is obtained by mixing 8 parts of ethylene glycol monobutyl ether, 57 parts of ethyl acetate, 2.5 parts of methyl isobutyl ketone, 10.5 parts of isopropanol, 7.5 parts of n-butanol and 14.5 parts of butyl acetate. When preparing the coating, just take the required number of parts.

[0091] The preparation method of the above-mentioned UV-curable coating comprises the following steps:

[0092] (1) Composite diluent: 8 parts of ethylene glycol monobutyl ether, 57 parts of ethyl acetate, 2.5 parts of methyl isobutyl ketone, 10.5 parts of isopropanol, 7.5 parts of n-butanol and 14.5 parts of butyl acetate are mixed thoroughly to obtain a composite diluent;

[0093] (2) First, 0.7 parts of cellulose resin is dissolved at high speed with 6.3 parts of composite diluent to form a cellulose solution, and then 1.7 parts of photoinitiator is fully mixed with 4 parts of composite diluent and dissolved until clear, and then 20 parts of acrylic resin A, 6 parts of acrylic resin B and 2 parts of acrylic resin C, 9 parts of acrylic resin D and the above cellulose solution, 0.5 parts of dispersant, 0.2 parts of stain resistance aid, and 2 parts of anti-settling agent are added, and after being uniformly dispersed by stirring at medium speed, 5.2 parts of silica matting agent and 4 parts of micro powder (5070D of Dainichi Seika) are added during stirring, and then dispersed at a high speed of 800-1000r / min for about 30 minutes until the fineness is qualified, and finally 38.4 parts of composite diluent are added and adjusted to a qualified viscosity to obtain the main part of the coating;

[0094] (3) The coating main agent and the composite diluent are mixed in a weight ratio of 100:45 to obtain the ultraviolet light curing coating.

[0095] Comparative Example 2

[0096] A UV curing coating comprises a coating main agent and a composite diluent.

[0097] The coating main agent includes, by weight, 20 parts of acrylic resin A, 6 parts of acrylic resin B, 2 parts of acrylic resin C, 9 parts of acrylic resin D, 0.7 parts of cellulose resin, 5.2 parts of silica matting agent, 4 parts of micropowder, 1.7 parts of photoinitiator, 0.5 parts of dispersant, 0.2 parts of stain resistance additive, 2 parts of anti-settling agent, and 48.7 parts of composite diluent I.

[0098] Among them, acrylic resin A is B-6105 from Boxing; acrylic resin B is BW8006 from Bahe; acrylic resin C is B-1603 from Boxing; acrylic resin D is 6071 from Changxing; cellulose resin is CAB-381-20 from EASTMEN; silica matting agent is OK607 from Degussa; micropowder is EXP8018-1 from Evonik; photoinitiator is 1-hydroxycyclohexyl phenyl ketone from Double Bond Chemical; dispersant is BYK-2008 from BYK Chemical; stain resistance additive is L8315 from Tianlong Chemical; anti-settling agent is NS-5500 from Desbaron; composite diluent I is the same as the composite diluent, and the composite diluent can be prepared and weighed according to the required number of portions.

[0099] The composite diluent is obtained by mixing 8 parts of ethylene glycol monobutyl ether, 57 parts of ethyl acetate, 2.5 parts of methyl isobutyl ketone, 10.5 parts of isopropanol, 7.5 parts of n-butanol and 14.5 parts of butyl acetate. When preparing the coating, just take the required number of parts.

[0100] The preparation method of the above-mentioned UV-curable coating comprises the following steps:

[0101] (1) Composite diluent: 8 parts of ethylene glycol monobutyl ether, 57 parts of ethyl acetate, 2.5 parts of methyl isobutyl ketone, 10.5 parts of isopropanol, 7.5 parts of n-butanol and 14.5 parts of butyl acetate are mixed thoroughly to obtain a composite diluent;

[0102] (2) First, 0.7 parts of cellulose resin is dissolved at high speed with 6.3 parts of composite diluent to form a cellulose solution, and then 1.7 parts of photoinitiator is fully mixed with 4 parts of composite diluent and dissolved until clear, and then 20 parts of acrylic resin A, 6 parts of acrylic resin B and 2 parts of acrylic resin C, 9 parts of acrylic resin D and the above cellulose solution, 0.5 parts of dispersant, 0.2 parts of stain resistance aid, and 2 parts of anti-settling agent are added, and after being uniformly dispersed by stirring at medium speed, 5.2 parts of silica matting agent (OK607 of Degussa) and 4 parts of micro powder are added during stirring, and then dispersed at a high speed of 800-1000r / min for about 30 minutes until the fineness is qualified, and finally 38.4 parts of composite diluent are added and adjusted to a qualified viscosity to obtain the main part of the coating;

[0103] (3) The coating main agent and the composite diluent are mixed in a weight ratio of 100:45 to obtain a UV curing coating.

[0104] Application Examples

[0105] A 1.1-caliber pneumatic spray gun was used with an air pressure of 0.3 MPa to spray the light-curing coatings obtained in the embodiment and the comparative example on the workpiece, respectively. The film thickness was defined as 20 μm, and then baked at 50-55°C for 7 minutes. Then, the UVA energy was 900 mj / cm 2 The coatings were cured to obtain coatings corresponding to the coatings in the embodiments and comparative examples.

[0106] The properties of the coatings prepared in the examples and comparative examples were tested, wherein the test method for the glitter texture grade was a sensory test, the test method for the transparency was a light transmittance tester, and the steel wool resistance was measured by an abrasion tester. The test results are shown in Table 1.

[0107] Table 1: Performance tests of examples and comparative examples

[0108]

[0109] As can be seen from the table above, comparing Examples 1-3, resin B and micropowder provide a glitter effect. Within a certain range, when the amount used is greater, the more dense the flash points are, and the better the glitter sand effect is. Different resin and micropowder contents will result in different performances. Comparing the examples with Comparative Example 1, it can be seen that the micropowder is better than Dainichi Refinery's 5070D, and the glitter effect, transparency and steel wool resistance of the paint film are significantly reduced; comparing the examples with Comparative Example 2, it can be seen that the matting agent E-1011 has better transparency than the silica matting agent OK607, and can reflect a better glittering effect.

[0110] The above is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the protection scope of the present invention.

Claims

1. A UV-curable coating with a flash sand effect, characterized in that: Including paint main agent and compound diluent; The coating main agent comprises, by weight: 15-25 parts of acrylic resin A; 3-9 parts of acrylic resin B; 1-4 parts of acrylic resin C; 6-12 parts of acrylic resin D; 0.7 parts of cellulose resin, 4-6 parts of silicon dioxide matting agent; 2-6 parts of micro powder; The composite diluent includes at least two of ethylene glycol monobutyl ether, ethyl acetate, methyl isobutyl ketone, isopropanol, n-butanol, and butyl acetate; The acrylic resin A is polyurethane acrylate; The acrylic resin B is an aliphatic polyurethane acrylic resin; The acrylic resin C is an epoxy-modified acrylic resin; The acrylic resin D is a solvent-based acrylic resin; The mass ratio of the coating main agent to the composite diluent is 100:40-50.

2. The UV curing coating according to claim 1, characterized in that: In the coating main agent, the acrylic resin A is a hexafunctional polyurethane acrylate; preferably, the acrylic resin A includes B-6105 of Boxing; And / or, the acrylic resin B is a trifunctional aliphatic polyurethane acrylic resin; preferably, the acrylic resin B includes BW8006 of Bahe; And / or, the acrylic resin C is a difunctional epoxy-modified acrylic resin, preferably, the acrylic resin C includes B-1603 of Boxing; And / or, the acrylic resin D is a tetrafunctional solvent-based acrylic resin; preferably, the acrylic resin D includes Changxing's 6071; The cellulose resin includes CAB-381-20 from EASTMEN.

3. The UV curing coating according to claim 1, characterized in that: In the coating main agent, the particle size of the silicon dioxide matting agent is 1.2-1.6 μm, and the specific surface area is 120-160 m 2 / g; And / or, the D50 particle size of the micropowder is 3.0-4.0 μm.

4. The UV curing coating according to claim 1, characterized in that: In the coating main agent, the silicon dioxide matting agent includes E-1011 of Tosoh Chemical; And / or, the micro powder includes EXP8018-1 produced by Evonik.

5. The UV curing coating according to claim 1, characterized in that: The coating main agent also includes the following components by weight: 1.2-2.0 parts of photoinitiator, 0.5 parts of dispersant, 0.2 parts of anti-fouling agent, 2.0 parts of anti-settling agent, 50.3-60.3 parts of composite diluent I.

6. The UV curing coating according to claim 5, characterized in that: The photoinitiator includes double-bond chemical 1-hydroxycyclohexyl phenyl ketone; And / or, the dispersant comprises BYK-2008 of BYK Chemical; And / or, the anti-fouling agent includes L8315 from Tianlong Chemical.

7. The UV curing coating according to claim 5, characterized in that: The anti-settling agent includes NS-5500 of Desbaron; and / or, the composite diluent I is the same as the composite diluent.

8. The UV curing coating according to claim 1, characterized in that: The composite diluent comprises the following components in parts by weight: 5-10 parts of ethylene glycol monobutyl ether; 50-60 parts of ethyl acetate; 2-5 parts of methyl isobutyl ketone; 8-12 parts of isopropanol; 5-10 parts of n-butanol; and 12-18 parts of butyl acetate.

9. A method for preparing the UV-curable coating according to any one of claims 1 to 8, characterized in that: The preparation method comprises the following steps: by weight, S1: 5-10 parts of ethylene glycol monobutyl ether, 50-60 parts of ethyl acetate, 2-5 parts of methyl isobutyl ketone, 8-12 parts of isopropanol, 5-10 parts of n-butanol and 12-18 parts of butyl acetate are fully mixed to obtain a composite diluent or composite diluent I for standby use; S2: prepare the main agent; S2-1 Add 0.7 parts of cellulose resin to 6.3 parts of composite diluent I to dissolve into a cellulose solution; S2-2: 1.2-2.0 parts of photoinitiator and 4 parts of composite diluent I are fully mixed and dissolved until clear, and then 15-25 parts of acrylic resin A, 3-9 parts of acrylic resin B, 1-4 parts of acrylic resin C, 6-12 parts of acrylic resin D, cellulose solution of step S2-1, 0.5 parts of dispersant, 0.2 parts of stain resistance aid, 2 parts of anti-settling agent are added, and after stirring and dispersing evenly, 4-6 parts of silica matting agent and 2-6 parts of micro powder are added after stirring and dispersing, and then dispersed at 800-1000r / min for 30min until the fineness is qualified, and finally 40-50 parts of composite diluent I are added, and the viscosity is adjusted to 16-20s to meet the requirements, and the coating main agent is obtained; S3: mixing the coating main agent of step S2 and the composite diluent prepared in step S1 to obtain the ultraviolet light curing coating; In step S3, the mass ratio of the coating main agent to the composite diluent is 100:40-50.

10. An application of the UV-curable coating according to any one of claims 1 to 8 or the UV-curable coating prepared by the preparation method according to claim 9, characterized in that: For spraying workpieces, the specific method of the application is: The ultraviolet light curing coating is sprayed on a workpiece containing a primer to form a wet film, pre-baked, and then cured to obtain a coating film; The pre-baking temperature is 50-55°C and the time is 5-8min; The curing adopts UVA curing; The UVA curing energy is 700-1000mj / cm 2 ; The coating film has a thickness of 18-23 μm.

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