A frost effect light-cured coating and a preparation method thereof

Abstract

The application discloses an ice flower effect photocuring paint, which comprises a film forming resin system and a composite diluent; the film forming resin system is composed of acrylic resin A 10-15 parts, acrylic resin B 20-25 parts, acrylic resin C 30 parts, ethyl acetate 14.5 parts, a photoinitiator 15-25 parts and a leveling agent 0.5 part; the composite diluent is composed of butyl acetate 30-35 parts, ethyl acetate 20-29 parts, propylene glycol methyl ether 10-15 parts, diacetone alcohol 11-15 parts and diisobutyl ketone 15-20 parts; the paint can be applied to plastic and other materials which are not resistant to high temperature by low preheating temperature, the curing temperature is low temperature of 55-65 DEG C, the UVA low energy is suitable for more types of materials, the film forming blooming is stable, and more market demands are met.

Description

Technical Field

[0001] This invention relates to the field of photocurable coatings, and in particular to a photocurable coating with an ice flower effect and its preparation method. Background Technology

[0002] Ice flower paint's film resembles ice flowers condensing on a winter windowpane, its visual effect reminiscent of snowflakes and ice patterns. It belongs to the category of artistic paints. It boasts a strong three-dimensional effect, unique colors, a mirror-like shine, and the ability to conceal rough surfaces. As consumers increasingly demand high-quality product aesthetics, many paint manufacturers are no longer limited to simply attracting consumers with color, creating ice flower effect coatings with special effects and textures. Currently, most ice flower paint products on the market require high-temperature baking after spraying to achieve the final special texture. While some metal materials can withstand this, many plastic materials cannot withstand temperatures exceeding 100℃. Summary of the Invention

[0003] To address the problem that traditional ice flower paints require high-temperature baking at over 100℃, which causes deformation of plastic materials at high temperatures, this invention provides an ice flower effect UV-curable coating and its preparation method. The coating of this invention has a low curing temperature of 55-65℃, low UVA energy, is suitable for more types of materials, and exhibits stable film formation and blooming, meeting a wider range of market demands.

[0004] The technical solution of the present invention is as follows:

[0005] The first objective of this invention is to provide a UV-curable coating with an ice flower effect, the UV-curable coating comprising a film-forming resin system and a composite diluent;

[0006] The raw materials contained in the film-forming resin system and the weight parts of each raw material are as follows:

[0007]

[0008]

[0009] The raw materials contained in the composite diluent and the weight proportions of each raw material are as follows:

[0010]

[0011] Acrylic resin A is a high-functionality monomer resin; acrylic resin B is a difunctional monomer resin.

[0012] In one embodiment of the present invention, the acrylic resin A is DPHA.

[0013] In one embodiment of the present invention, the acrylic resin A is one or more of Changxing Chemical's EM267 and DSM New Energy's AgiSyn 2830L.

[0014] The acrylic resin A has the characteristics of high reactivity and high shrinkage.

[0015] In one embodiment of the present invention, the acrylic resin B is one or more of NPG2PODA and HDDA.

[0016] In one embodiment of the present invention, the acrylic resin B is one or more of EM2251 and EM221TF from Changxing Chemical.

[0017] The acrylic resin B has the characteristics of low reactivity and low shrinkage.

[0018] In one embodiment of the present invention, the acrylic resin C is one or more of Mitsui Chemicals' RA6800 and Cytec Chemicals' EBECRYL 1290N.

[0019] The acrylic resin C provides excellent physical properties after participating in film formation.

[0020] In one embodiment of the present invention, the photoinitiator is benzophenone.

[0021] In one embodiment of the present invention, the leveling agent is polyether-modified polydimethylsiloxane.

[0022] In one embodiment of the present invention, the leveling agent is one or more of BYK333 from BYK Chemicals and Lencoo 3103.

[0023] A second objective of this invention is to provide a method for preparing the aforementioned ice flower effect UV-curable coating, the method comprising the following steps:

[0024] (1) Mix 15-25 parts of photoinitiator with 14.5 parts of ethyl acetate thoroughly and dissolve until clear. While stirring, add 10-15 parts of acrylic resin A, 20-25 parts of acrylic resin B and 30 parts of acrylic resin C. After the acrylic resin is completely dissolved, add 0.5 parts of leveling agent and stir to disperse until clear to obtain the film-forming resin system.

[0025] (2) Mix 30-35 parts of butyl acetate, 20-29 parts of ethyl acetate, 10-15 parts of propylene glycol methyl ether, 11-15 parts of diacetone alcohol and 15-20 parts of diisobutyl ketone thoroughly to obtain a composite diluent;

[0026] (3) The film-forming resin system and the composite diluent are mixed at a weight ratio of 100:60 to obtain the ice flower effect light-cured coating.

[0027] The third objective of this invention is to provide a coating obtained by the aforementioned ice flower effect UV-cured coating, wherein the ice flower effect UV-cured coating is sprayed onto a workpiece to form a coating film, and then pre-baked and UVA cured, and the coating film is obtained after it reaches surface dryness.

[0028] In one embodiment of the present invention, the baking temperature is 55-65℃, the baking time is 4-6 min, and the UVA energy is 1000-1300 mJ / cm². 2 The coating thickness is 20-25 μm.

[0029] The beneficial technical effects of this invention are as follows:

[0030] In this invention, two monomeric resins (acrylic resin A and acrylic resin B) with different curing rates are selected and blended in different proportions to produce different ice flower effects. Acrylic resin C has good film-forming properties and a high TG point.

[0031] The product of this invention uses benzophenone, which can fully utilize its characteristics of fast photocuring rate, high initiation efficiency, and good resistance to yellowing. At the same time, it offers a wide range of primer options, resulting in a highly customizable color and appearance.

[0032] The product of this invention can apply the ice flower effect to materials such as plastics that are not resistant to high temperatures by using a low preheating temperature, resulting in low energy consumption and a wider range of applications.

[0033] The product of this invention is energy-saving and environmentally friendly, with stable and beautiful film formation and clear texture, which meets the current social development needs and environmental protection requirements. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the embodiments.

[0035] Example 1

[0036] A method for preparing a UV-curable coating with an ice flower effect includes the following steps:

[0037] (1) Mix 20 parts of benzophenone and 14.5 parts of ethyl acetate thoroughly and dissolve until clear. While stirring, add 10 parts of EM267, 25 parts of EM2251 and 30 parts of RA6800. After the acrylic resin is completely dissolved, add 0.5 parts of BYK333 and stir until clear to obtain the film-forming resin system.

[0038] (2) Mix 35 parts butyl acetate, 20 parts ethyl acetate, 10 parts propylene glycol methyl ether, 15 parts diacetone alcohol and 20 parts diisobutyl ketone thoroughly to obtain a composite diluent;

[0039] (3) The film-forming resin system and the composite diluent are mixed at a weight ratio of 100:60 to obtain the ice flower effect light-cured coating.

[0040] Example 2

[0041] A method for preparing a UV-curable coating with an ice flower effect includes the following steps:

[0042] (1) Mix 20 parts of benzophenone and 14.5 parts of ethyl acetate thoroughly and dissolve until clear. While stirring, add 13 parts of EM267, 22 parts of EM2251 and 30 parts of RA6800. After the acrylic resin is completely dissolved, add 0.5 parts of BYK333 and stir until clear to obtain the film-forming resin system.

[0043] (2) Mix 35 parts butyl acetate, 20 parts ethyl acetate, 10 parts propylene glycol methyl ether, 15 parts diacetone alcohol and 20 parts diisobutyl ketone thoroughly to obtain a composite diluent;

[0044] (3) The film-forming resin system and the composite diluent are mixed at a weight ratio of 100:60 to obtain the ice flower effect light-cured coating.

[0045] Example 3

[0046] A method for preparing a UV-curable coating with an ice flower effect includes the following steps:

[0047] (1) Mix 20 parts of benzophenone and 14.5 parts of ethyl acetate thoroughly and dissolve until clear. While stirring, add 15 parts of EM267, 20 parts of EM2251 and 30 parts of RA6800. After the acrylic resin is completely dissolved, add 0.5 parts of BYK333 and stir until clear to obtain the film-forming resin system.

[0048] (2) Mix 35 parts butyl acetate, 20 parts ethyl acetate, 10 parts propylene glycol methyl ether, 15 parts diacetone alcohol and 20 parts diisobutyl ketone thoroughly to obtain a composite diluent;

[0049] (3) The film-forming resin system and the composite diluent are mixed at a weight ratio of 100:60 to obtain the ice flower effect light-cured coating.

[0050] Example 4

[0051] A method for preparing a UV-curable coating with an ice flower effect includes the following steps:

[0052] (1) Mix 15 parts of benzophenone and 14.5 parts of ethyl acetate thoroughly and dissolve until clear. While stirring, add 10 parts of EM267, 25 parts of EM2251 and 30 parts of RA6800. After the acrylic resin is completely dissolved, add 0.5 parts of BYK333 and stir until clear to obtain the film-forming resin system.

[0053] (2) Mix 35 parts butyl acetate, 20 parts ethyl acetate, 10 parts propylene glycol methyl ether, 15 parts diacetone alcohol and 20 parts diisobutyl ketone thoroughly to obtain a composite diluent;

[0054] (3) The film-forming resin system and the composite diluent are mixed at a weight ratio of 100:60 to obtain the ice flower effect light-cured coating.

[0055] Example 5

[0056] A method for preparing a UV-curable coating with an ice flower effect includes the following steps:

[0057] (1) Mix 25 parts of benzophenone and 14.5 parts of ethyl acetate thoroughly and dissolve until clear. While stirring, add 10 parts of EM267, 25 parts of EM2251 and 30 parts of EBECRYL 1290N. After the acrylic resin is completely dissolved, add 0.5 parts of BYK333 and stir until clear to obtain the film-forming resin system.

[0058] (2) Mix 35 parts butyl acetate, 20 parts ethyl acetate, 10 parts propylene glycol methyl ether, 15 parts diacetone alcohol and 20 parts diisobutyl ketone thoroughly to obtain a composite diluent;

[0059] (3) The film-forming resin system and the composite diluent are mixed at a weight ratio of 100:60 to obtain the ice flower effect light-cured coating.

[0060] Example 6

[0061] A method for preparing a UV-curable coating with an ice flower effect includes the following steps:

[0062] (1) Mix 20 parts of benzophenone and 14.5 parts of ethyl acetate thoroughly and dissolve until clear. While stirring, add 10 parts of EM267, 25 parts of EM2251 and 30 parts of RA6800. After the acrylic resin is completely dissolved, add 0.5 parts of BYK333 and stir until clear to obtain the film-forming resin system.

[0063] (2) Mix 30 parts butyl acetate, 29 parts ethyl acetate, 10 parts propylene glycol methyl ether, 11 parts diacetone alcohol and 15 parts diisobutyl ketone thoroughly to obtain a composite diluent;

[0064] (3) The film-forming resin system and the composite diluent are mixed at a weight ratio of 100:60 to obtain the ice flower effect light-cured coating.

[0065] Example 7

[0066] A method for preparing a UV-curable coating with an ice flower effect includes the following steps:

[0067] (1) Mix 20 parts of benzophenone and 14.5 parts of ethyl acetate thoroughly and dissolve until clear. While stirring, add 10 parts of EM267, 25 parts of EM2251 and 30 parts of RA6800. After the acrylic resin is completely dissolved, add 0.5 parts of BYK333 and stir until clear to obtain the film-forming resin system.

[0068] (2) Mix 35 parts butyl acetate, 20 parts ethyl acetate, 15 parts propylene glycol methyl ether, 15 parts diacetone alcohol and 20 parts diisobutyl ketone thoroughly to obtain a composite diluent;

[0069] (3) The film-forming resin system and the composite diluent are mixed at a weight ratio of 100:60 to obtain the ice flower effect light-cured coating.

[0070] Comparative Example 1

[0071] A method for preparing a photocurable coating includes the following steps:

[0072] (1) Mix 20 parts of benzophenone and 14.5 parts of ethyl acetate thoroughly and dissolve until clear. While stirring, add 35 parts of EM2251 and 30 parts of RA6800. After the acrylic resin is completely dissolved, add 0.5 parts of BYK333 and stir until clear to obtain the film-forming resin system.

[0073] (2) Mix 35 parts butyl acetate, 20 parts ethyl acetate, 10 parts propylene glycol methyl ether, 15 parts diacetone alcohol and 20 parts diisobutyl ketone thoroughly to obtain a composite diluent;

[0074] (3) The film-forming resin system and the composite diluent are mixed at a weight ratio of 100:60 to obtain the photocurable coating.

[0075] Comparative Example 2

[0076] A method for preparing a photocurable coating includes the following steps:

[0077] (1) Mix 20 parts of benzophenone and 14.5 parts of ethyl acetate thoroughly and dissolve until clear. While stirring, add 35 parts of EM267 and 30 parts of RA6800. After the acrylic resin is completely dissolved, add 0.5 parts of BYK333 and stir until clear to obtain the film-forming resin system.

[0078] (2) Mix 35 parts butyl acetate, 20 parts ethyl acetate, 10 parts propylene glycol methyl ether, 15 parts diacetone alcohol and 20 parts diisobutyl ketone thoroughly to obtain a composite diluent;

[0079] (3) The film-forming resin system and the composite diluent are mixed at a weight ratio of 100:60 to obtain the photocurable coating.

[0080] Comparative Example 3

[0081] A method for preparing a photocurable coating includes the following steps:

[0082] (1) Mix 20 parts of benzophenone and 14.5 parts of ethyl acetate thoroughly and dissolve until clear. While stirring, add 10 parts of EM221TF, 25 parts of EM2251 and 30 parts of RA6800. After the acrylic resin is completely dissolved, add 0.5 parts of BYK333 and stir until clear to obtain the film-forming resin system.

[0083] (2) Mix 35 parts butyl acetate, 20 parts ethyl acetate, 10 parts propylene glycol methyl ether, 15 parts diacetone alcohol and 20 parts diisobutyl ketone thoroughly to obtain a composite diluent;

[0084] (3) The film-forming resin system and the composite diluent are mixed at a weight ratio of 100:60 to obtain the photocurable coating.

[0085] Comparative Example 4

[0086] A method for preparing a photocurable coating includes the following steps:

[0087] (1) Mix 13 parts of benzophenone and 14.5 parts of ethyl acetate thoroughly and dissolve until clear. While stirring, add 10 parts of EM267, 25 parts of EM2251 and 30 parts of RA6800. After the acrylic resin is completely dissolved, add 0.5 parts of BYK333 and stir until clear to obtain the film-forming resin system.

[0088] (2) Mix 35 parts butyl acetate, 20 parts ethyl acetate, 10 parts propylene glycol methyl ether, 15 parts diacetone alcohol and 20 parts diisobutyl ketone thoroughly to obtain a composite diluent;

[0089] (3) The film-forming resin system and the composite diluent are mixed at a weight ratio of 100:60 to obtain the photocurable coating.

[0090] Comparative Example 5

[0091] A method for preparing a photocurable coating includes the following steps:

[0092] (1) Mix 28 parts of benzophenone and 14.5 parts of ethyl acetate thoroughly and dissolve until clear. While stirring, add 10 parts of EM267, 25 parts of EM2251 and 30 parts of RA6800. After the acrylic resin is completely dissolved, add 0.5 parts of BYK333 and stir until clear to obtain the film-forming resin system.

[0093] (2) Mix 35 parts butyl acetate, 20 parts ethyl acetate, 10 parts propylene glycol methyl ether, 15 parts diacetone alcohol and 20 parts diisobutyl ketone thoroughly to obtain a composite diluent;

[0094] (3) The film-forming resin system and the composite diluent are mixed at a weight ratio of 100:60 to obtain the photocurable coating.

[0095] Application examples

[0096] The UV-curable coatings obtained in the examples and comparative examples were sprayed onto the workpiece using a 1.1-caliber pneumatic spray gun with the air pressure adjusted to 0.3 MPa. The film thickness was defined as 20 μm. The subsequent baking temperature was 55-65℃ / 4-6 min, and the UVA energy was 1000-1300 mJ / cm². 2 After the coating reaches surface dryness, the desired coating is obtained. The performance test results of each coating are shown in Table 1. (The workpiece coated with the test samples was a PC / ABS sheet, the baking temperature was 65℃ / 4min, and the UVA energy was 1200mj / cm².) 2 )

[0097] Table 1

[0098]

[0099]

[0100] A comparison of Examples 1-3 and Comparative Examples 1-3 shows that the more DPHA resin with high reactivity and high shrinkage is used, the greater the difference in reactivity and shrinkage between it and NPG2PODA resin with low reactivity and low shrinkage, the easier it is to form ice flowers and the more obvious the effect. Conversely, if only one type of low reactivity resin, one type of high reactivity resin, or both types of low reactivity resin are used, the difference in reactivity and resin shrinkage is small, and it is difficult to form ice flower patterns.

[0101] Examples 2, 4, and 5, compared with Comparative Examples 4 and 5, show that the amount of photoinitiator benzophenone affects the ice flower effect. Within the range of 15%-25%, the higher the amount, the greater the reactivity, the faster the reaction speed, and the more obvious the ice flower effect. Below this amount, the reactivity and speed are insufficient to form the ice flower effect, while above this amount, the reactivity and reaction speed are too high and too fast, which makes cracking more likely.

[0102] In summary, the success of this invention and the ease with which the ice flower effect is formed are due to the difference in reactivity and shrinkage between the two or more resins in the formula. That is, the greater the difference in reactivity and shrinkage, the easier it is to form an ice flower effect, and vice versa.

[0103] The above embodiments are merely preferred embodiments of the present invention and are not limited to the selection of specific resin grades. Various variations are possible for resins of the same or similar categories in the art. Any modifications, equivalent substitutions, improvements, etc., made within the design principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A UV-cured coating with an ice flower effect, characterized in that, The photocurable coating comprises a film-forming resin system and a composite diluent; The raw materials contained in the film-forming resin system and the weight parts of each raw material are as follows: 10-15 parts of acrylic resin A Acrylic resin B20-25 parts Acrylic resin C30 parts 14.5 parts of ethyl acetate 15-25 parts of photoinitiator 0.5 parts leveling agent; The raw materials contained in the composite diluent and the weight proportions of each raw material are as follows: 30-35 parts of butyl acetate 20-29 parts of ethyl acetate 10-15 parts of propylene glycol methyl ether 11-15 parts of diacetone alcohol 15-20 parts of diisobutyl ketone; The acrylic resin A is DPHA; The acrylic resin B is one or more of NPG2PODA and HDDA; The acrylic resin C is one or more of Mitsui Chemicals' RA6800 and Cytec Chemicals' EBECRYL 1290 N; The photoinitiator is benzophenone; The film-forming resin system and the composite diluent are mixed at a weight ratio of 100:60 to obtain the ice flower effect UV-cured coating.

2. The ice flower effect UV-cured coating according to claim 1, characterized in that, The acrylic resin A is one or more of Changxing Chemical's EM267 and DSM New Energy's AgiSyn 2830L.

3. The UV-cured coating with ice flower effect according to claim 1, characterized in that, The acrylic resin B is one or more of Changxing Chemical's EM2251 and EM221TF.

4. The UV-cured coating with ice flower effect according to claim 1, characterized in that, The leveling agent is polyether-modified polydimethylsiloxane.

5. The UV-cured coating with ice flower effect according to claim 4, characterized in that, The leveling agent is one or more of BYK333 from BYK Chemicals and Lencolo 3103.

6. A method for preparing the ice flower effect UV-curable coating as described in claim 1, characterized in that, The preparation method includes the following steps: (1) Mix 15-25 parts of photoinitiator with 14.5 parts of ethyl acetate thoroughly and dissolve until clear. While stirring, add 10-15 parts of acrylic resin A, 20-25 parts of acrylic resin B and 30 parts of acrylic resin C. After the acrylic resin is completely dissolved, add 0.5 parts of leveling agent and stir to disperse until clear to obtain the film-forming resin system. (2) Mix 30-35 parts of butyl acetate, 20-29 parts of ethyl acetate, 10-15 parts of propylene glycol methyl ether, 11-15 parts of diacetone alcohol and 15-20 parts of diisobutyl ketone thoroughly to obtain a composite diluent; (3) Mix the film-forming resin system and the composite diluent at a weight ratio of 100:60 to obtain the ice flower effect light-cured coating.

7. A coating obtained from the UV-cured coating with the ice flower effect as described in claim 1, characterized in that, The ice flower effect UV-cured coating is sprayed onto the workpiece to form a coating film. After pre-baking and UVA curing, the coating film is obtained after it reaches surface dryness.

8. The coating according to claim 7, characterized in that, The pre-baking temperature is 55-65℃, and the time is 4-6 minutes; the UVA energy is 1000-1300 mJ / cm². 2 The coating thickness is 20-25µm.

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