CN104164179A - UV (Ultraviolet) paint composition and preparation method thereof - Google Patents

Abstract

The invention provides a UV paint composition, which is composed by weight percentage: 15-40wt% of bifunctional polyurethane acrylic resin, 5-30wt% of multifunctional polyurethane acrylic resin, 5-20wt% of diluting monomer, diluting 30-60wt% of the photoinitiator, 1-5wt% of the photoinitiator, wherein, the elongation of the two-functional polyurethane acrylic resin is greater than 100%. The invention also provides a preparation method of the UV paint composition. The UV paint of the invention has good corrosion resistance, and the border of the decorated product is clear, which meets people's increasingly strict requirements on product appearance.

Description

A kind of UV paint composition and preparation method thereof

technical field

The invention belongs to the field of UV paints, in particular to a UV composition and a preparation method thereof. the

Background technique

At present, the integrated seamless appearance products of glass and plastic, metal and plastic on the market have become a highlight in the electronics industry and other industries, because the performance of plastic injection molding cannot meet the requirements, and it needs to be decorated. the

The traditional method of using jigs to protect the non-decorative surface may easily cause unclear boundaries between the decorative surface and the non-decorative surface, such as sawtooth, multi-spray, steps, etc., which seriously affect the appearance of the integrated seamless technology. the

However, the method of protecting the non-decorative surface with a protective film is not suitable for a structure with a curved surface. The method for a flat surface not only requires extremely high processing accuracy of the film fixture and protective film, but also produces The obvious problem of step feeling affects the appearance and feel of integrated seamless injection molding products. the

Contents of the invention

The present invention solves the technical problem of unclear boundaries in the decoration of the existing integrated seamless appearance of glass and plastic, metal and plastic, and provides an integrated seamless appearance of glass and plastic, metal and plastic A UV paint composition for decoration with clear product boundaries and a preparation method thereof. the

The invention provides a kind of UV paint composition, the composition by weight percentage is:

Two-functional polyurethane acrylic resin 15-40 wt%

Multifunctional Polyurethane Acrylic Resin 5-30 wt %

Dilute monomer 5-20 wt %

Thinner 30-60 wt %

Photoinitiator 1-5 wt %,

Wherein, the elongation of the two-functional polyurethane acrylic resin is greater than 100%.

The present invention also provides a kind of preparation method of UV paint composition, and this method comprises the steps:

(1) Stir and mix two-functional polyurethane acrylic resin, multi-functional polyurethane acrylic resin, diluent monomer and diluent to form a mixture;

(2) Add a photoinitiator and a leveling agent to the mixture in step (1) and stir and mix to obtain a UV paint composition;

Wherein, based on the total weight of the UV paint composition, the content of the bifunctional polyurethane acrylic resin is 15-40 wt%, the content of the multifunctional polyurethane acrylic resin is 5-30 wt%, and the content of the diluting monomer is 5 -20 wt %, the content of diluent is 30-60 wt %, and the content of photoinitiator is 1-5 wt %.

The UV paint of the invention has good corrosion resistance, and the border of the decorated product is clear, which meets people's increasingly strict requirements on product appearance. the

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. the

The invention provides a kind of UV paint composition, the composition by weight percentage is:

Two-functional polyurethane acrylic resin 15-40 wt%

Multifunctional Polyurethane Acrylic Resin 5-30 wt %

Dilute monomer 5-20 wt %

Thinner 30-60 wt %

Photoinitiator 1-5 wt %,

Wherein, the elongation of the two-functional polyurethane acrylic resin is greater than 100%.

The application of the resin with higher elongation in the paint composition improves the toughness of the paint, reduces the brittleness of the paint, and makes the paint moderately soft and hard. With good performance, after part of the paint coating is wiped off, the boundary between the remaining part and the wiped out part is clear without jaggedness, ensuring a good appearance of the product. the

Preferably, the composition by weight percentage is:

Two-functional polyurethane acrylic resin 19-34wt%

Multifunctional Polyurethane Acrylic Resin 10-21 wt %

Dilute monomer 8-16 wt %

Thinner 35-50 wt %

Photoinitiator 2-4 wt %.

Preferably, the elongation of the two-functional polyurethane acrylic resin is 100-330%. The two-functional polyurethane acrylic resin can be selected from CN965NS, CN9001NS, CN9782 of Sartomer, UV-3520TL, UV-3700B of Nippon Synthetic Chemicals, 6113, 6148J-75 of Changxing Chemical Industry Co., Ltd. More preferably, CN965NS of Sartomer, UV-3520TL of Nippon Synthetic Chemicals, and 6148J-75 of Changxing Chemical Industry Co., Ltd. are selected. the

Preferably, the functionality of the multifunctional polyurethane acrylic resin is 3-7. The multifunctional urethane acrylate can be selected from Changxing 6158B-80, 6147, CN989, PRO30053, CN8001, PRO30183 of Sartomer, UV-1400B, UV-7640B of Nippon Synthetic Chemicals; more preferably, Changxing 6158B-80 , Sartomer's CN989 UV-7640B of Japan Synthetic Chemicals. the

Preferably, the diluting monomer is a monofunctional or multifunctional acrylic monomer. Sartomer SR256, SR238, SR454, SR351, EM70, EM223, EM235 of Changxing Chemical Industry Co., Ltd. can be used. It is more preferably a mixture of SR256, EM223, and SR454, and the use ratio is 0.5-2:1-2:1-2, and more preferably 1:1.5:1.5. the

Preferably, the diluent is at least one of toluene, xylene, ethyl acetate, butyl acetate, methyl isobutyl ketone, ethylene glycol ether acetate, cyclohexanone and n-butanol. It is more preferably a mixture of butyl acetate and n-butanol, the ratio of which is 4-6:0.5-1.5; more preferably 5:1. the

Preferably, the photoinitiator is 1-hydroxy-cyclohexyl-phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone and 2,4,6 (trimethylbenzyl Acyl) at least one of diphenylphosphine oxides. Such as Cibar184, Cibar1173, Cibar TPO, 369, 819, etc., preferably select Cibar184, Cibar1173. the

Preferably, the UV composition also includes a leveling agent, based on the total weight of the UV composition, the content of the leveling agent is 0.1-5 wt %. More preferably, 0.3-3.0wt% is selected. The leveling agent is a polysiloxane-polyether copolymer, a polyester-polysiloxane copolymer or a fluorine-containing leveling agent. For example, it can be one or more of TGEO Glide 450, TGEO Glide 410, TEGO Flow 300, TGEO Glide 435, BYK 333, BYK 346, BYK 380. the

The present invention also provides a kind of preparation method of UV paint composition, and this method comprises the steps:

(1) Stir and mix two-functional polyurethane acrylic resin, multi-functional polyurethane acrylic resin, diluent monomer and diluent to form a mixture;

(2) Adding a photoinitiator to the mixture in step (1) and stirring to obtain a UV paint composition;

Wherein, based on the total weight of the UV paint composition, the content of the bifunctional polyurethane acrylic resin is 15-40 wt%, the content of the multifunctional polyurethane acrylic resin is 5-30 wt%, and the content of the diluting monomer is 5 -20 wt %, the content of diluent is 30-60 wt %, and the content of photoinitiator is 1-5 wt %.

Preferably, the stirring speed of the step (1) is 600-800r/min, and the stirring time is 15-20min. the

Preferably, the stirring speed of the step (2) is 600-800r/min, and the stirring time is 10-15min. the

Preferably, it also includes adding a leveling agent when adding the photoinitiator, based on the total weight of the UV composition, the content of the leveling agent is 0.1-5 wt %. the

The present invention will be further described by specific examples below. the

Example 1

1. Preparation of paint

Use raw materials as shown in Table 1, prepare paint according to the following method:

(1) Weigh polyurethane acrylate and related diluting monomers and diluents according to the mass required by the formula, and stir in a high-speed disperser at a low speed (600r/min) for 20 minutes;

(2) Add the weighed photoinitiator and leveling agent, and continue to stir at 800r/min under the high-speed disperser for 15 minutes;

(3) Stop stirring, stand still to defoam and obtain UV paint A1.

2. Coating

Spraying with a manual spray gun: the compressed air pressure for spraying is controlled at 0.4-0.8MPa, the flow rate of paint liquid is controlled at 0.8-1.3ml/s, and the atomization spray width should be controlled between 15°-30°, (the spraying air pressure is too low, The atomization of the paint solution is insufficient and the paint film is uneven; when the spraying air pressure is too high, the paint solution atomizes well, but the paint mist speed is too fast and the paint loss increases) Use a 300-mesh filter cloth to filter the paint into the spray gun, and the spray gun The distance from the surface to be sprayed is 0.10-0.30m, and the film thickness is 15±5 microns. After the spraying was completed, it was placed at room temperature for 2 minutes, so that the coating could flow and spread on the substrate better. Then, it was baked at 60°C for 10 minutes, and a UV curing machine was used (the UV curing machine used in the experiment was Fusion company products, using D-type lamps, F300S lamps and LC6B conveyor belts) to cure, carry out UV curing under the conditions of the conveyor belt line speed of 3.0-5.0m/min and the energy of 1100-1400mJ/ ^cm2 , and then stand Until the temperature of the sample drops to room temperature, finally wipe off the paint layer on the surface of the PVD coating with a dust-free cloth to obtain the final product S1.

Table 1

.

Example 2-6

UV paints A2-A5 and sprayed products S2-S6 were prepared according to the method of Example 1. The difference is that the composition and content of UV paint are shown in Table 1.

Comparative example 1

The XPC 77082-P of PPG is sprayed with paint according to the above method of painting. After spraying, let stand at room temperature for 5 minutes, and then bake at 60 degrees Celsius for 10 minutes. When using a UV curing machine (the UV curing machine used in the experiment is a product of Fusion Company, using D-type lamps, F300S lamps and LC6B conveyor belts), the linear speed of the conveyor belt is 3.0-5.0m/min, and the energy is 1100-1400mJ Under the condition of 1/cm ² , carry out ultraviolet light curing, then let it stand until the temperature of the sample drops to room temperature, and finally wipe it with a dust-free cloth to remove the paint layer on the surface of the PVD coating, and obtain the final product CS1.

Test method and result

1) Adhesion test Test standard: ISO 2409

Test method: Use the back of a surgical scalpel to make 12 scratches on the coating, at least two of which are at an angle of 90° to the other scratches, to form a grid on the surface, with a side length of 1 mm . Make sure that every scratch cuts to the base material. Use the brush 5 times in both directions of the scratch. Stick 3M tape (Dongguan Omico Company, tape model 3M600) on the surface, rub the tape tightly with your fingertips to ensure good contact with the coating, and start from the free end of the tape at an angle of 60° within 5 minutes. The angle is within 0.5-1 second to peel off the tape regularly and tear off the tape.

classification:

5B: The edge of the incision is completely smooth, and the squares of the grid are not peeled off;

4B: The area of the peeled part is not more than 5% of the area of the tape in contact with the surface;

3B: The area of the peeled part is greater than 5% of the area of the tape in contact with the surface, but not more than 15%;

2B: The area of the peeled part is greater than 15% of the area of the tape in contact with the surface, but not more than 35%;

1B: The area of the peeled portion is greater than 35% and not more than 65% of the area of the tape in contact with the surface.

This test requires adhesion performance ≥ 3B. the

The results are shown in Table 2. the

2) Boundary conditions of composite materials

The presence or absence of sawtooth was observed with the naked eye, and the results are shown in Table 2.

3) Neutral salt spray test

Equipment Salt spray test machine PC240005, salt spray test for 48 hours to observe the color and luster of the paint film with naked eyes. If there is no change in color and gloss, it is deemed to pass the test. The results are shown in Table 2.

4) Constant temperature and humidity test

Test method: Place the sample at each temperature of -40°C and 85°C for 2 hours each, which is a cycle, the conversion time is less than 10 seconds, and the recovery time is less than 5 minutes, a total of 10 cycles, after the test is completed, restore at room temperature for 2 hours Hour. Then observe the condition of the sample. If the paint film has no bubbles after the test, and the sample has no abnormal changes such as coating cracking, peeling, blistering, and discoloration, it is deemed to pass the test. The results are shown in Table 2.

5) Thermal shock test

Test method: Place the sample at each temperature of -40°C and 85°C for 2 hours each, which is a cycle, the conversion time is less than 10 seconds, and the recovery time is less than 5 minutes, a total of 10 cycles, after the test is completed, restore at room temperature for 2 hours Hour. Then observe the condition of the sample. If the paint film has no bubbles after the test, and the sample has no abnormal changes such as coating cracking, peeling, blistering, and discoloration, it is deemed to pass the test. The results are shown in Table 2.

Table 2 Adhesion borderline case neutral salt spray Constant temperature and humidity Thermal shock S1 4B Sharp borders and no aliasing No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test S2 4B Sharp borders and no aliasing No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test S3 4B Sharp borders and no aliasing No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test S4 4B Sharp borders and no aliasing No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test S5 4B Sharp borders and no aliasing No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test No air bubbles in the paint film by visual inspection, no air bubbles in the paint film by visual inspection, and no abnormal phenomena such as coating cracking, peeling, blistering, and discoloration after the test S6 4B Sharp borders and no aliasing No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test CS1 4B The border is obviously jagged No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test No air bubbles in the paint film by visual inspection, and no coating cracking, peeling, blistering, discoloration and other abnormal phenomena after the test

It can be seen from Table 2 that the UV paint of the present invention has good corrosion resistance, and the border of the decorated product is clear, which meets people's increasingly stringent requirements on product appearance. the

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range. the

Claims (14)

1. A UV paint composition is characterized in that, the composition in weight percent is: Two-functional polyurethane acrylic resin 15-40 wt% Multifunctional Polyurethane Acrylic Resin 5-30 wt % Dilute monomer 5-20 wt % Thinner 30-60 wt % Photoinitiator 1-5 wt %, Wherein, the elongation of the two-functional polyurethane acrylic resin is greater than 100%. 2. UV paint composition according to claim 1, is characterized in that, composition by weight percentage is: Two-functional polyurethane acrylic resin 19-34wt% Multifunctional Polyurethane Acrylic Resin 10-21 wt % Dilute monomer 8-16 wt % Thinner 35-50 wt % Photoinitiator 2-4 wt %. 3. The UV paint composition according to claim 1, characterized in that, the elongation of the two-functional polyurethane acrylic resin is 100-330%. 4. The UV paint composition according to claim 1, characterized in that, the functionality of the multifunctional polyurethane acrylic resin is 3-7. 5. The UV paint composition according to claim 1, wherein the diluting monomer is a monofunctional or polyfunctional acrylic monomer. 6. The UV paint composition according to claim 5, wherein the diluting monomer is a mixture of SR256, EM223 and SR454, and the weight ratio of SR256, EM223 and SR454 is 0.5-2:1-2:1 -2. 7. UV paint composition according to claim 1, is characterized in that, described diluent is toluene, xylene, ethyl acetate, butyl acetate, methyl isobutyl ketone, ethylene glycol ethyl ether acetate , at least one of cyclohexanone and n-butanol. 8. UV paint composition according to claim 1, is characterized in that, described photoinitiator is 1-hydroxyl-cyclohexyl-phenyl ketone, 2-hydroxyl-2-methyl-1-phenyl- At least one of 1-acetone and 2,4,6(trimethylbenzoyl)diphenylphosphine oxide. 9. UV paint composition according to claim 1, is characterized in that, described UV composition also comprises leveling agent, is based on the gross weight of UV composition, and the content of described leveling agent is 0.1-5 wt %. 10. UV paint composition according to claim 9, is characterized in that, described leveling agent is polysiloxane-polyether copolymer, polyester-polysiloxane copolymer or fluorine-containing leveling agent. 11. A preparation method of UV paint composition, is characterized in that, comprises the steps: (1) Stir and mix two-functional polyurethane acrylic resin, multi-functional polyurethane acrylic resin, diluent monomer and diluent to form a mixture; (2) adding a photoinitiator to the mixture in step (1) and stirring to obtain a UV paint composition; Wherein, based on the total weight of the UV paint composition, the content of the bifunctional polyurethane acrylic resin is 15-40 wt%, the content of the multifunctional polyurethane acrylic resin is 5-30 wt%, and the content of the diluting monomer is 5 -20 wt %, the content of diluent is 30-60 wt %, and the content of photoinitiator is 1-5 wt %. 12. The preparation method according to claim 11, characterized in that, the stirring speed of the step (1) is 600-800r/min, and the stirring time is 15-20min. 13. The preparation method according to claim 11, characterized in that, the stirring speed of the step (2) is 600-800r/min, and the stirring time is 10-15min. 14. preparation method according to claim 11, is characterized in that, also comprises adding leveling agent when adding photoinitiator, is based on the gross weight of UV composition, and the content of described leveling agent is 0.1- 5 wt %.