Scratch-resistant polyurethane matte paint and method of making the same

Abstract

The present application relates to the technical field of paint, and particularly provides an anti-scratch polyurethane matte paint and a preparation method thereof.The anti-scratch polyurethane matte paint comprises CAB381-2 aqueous solution, fumed silica, propylene glycol methyl ether acetate, butyl acetate, PMMA micro powder, dispersant BYK163, leveling agent Di Guo 450 and hydroxyl acrylic resin and the like ingredients.The anti-scratch polyurethane matte paint has a unique wear-resistant-dispersive effect system, and the paint has high hardness and good dispersibility.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and in particular to a scratch-resistant polyurethane matte paint and its preparation method. Background Technology

[0002] Matte paints are commonly used in automotive interior and exterior trim to enhance the decorative effect. Polyurethane (PU) paints have excellent overall performance, but they also have shortcomings, such as whitening after matting, poor scratch resistance, and easy fingerprints. These problems are particularly noticeable when applying matte black paint, as the lower the gloss, the more pronounced they become. These issues have troubled manufacturers and engineers, and some problems have remained unresolved for a long time.

[0003] Therefore, there is a need for a scratch-resistant polyurethane matte varnish and its preparation method. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a scratch-resistant polyurethane matte paint and its preparation method.

[0005] On one hand, the present invention provides a method for preparing a scratch-resistant polyurethane matte paint, the method comprising the following steps:

[0006] Step 1: Take 5-10% of a 20% (w / w) CAB381-2 aqueous solution, 3-5% (w / w) fumed silica, 5-15% (w / w) propylene glycol methyl ether acetate, 5-15% (w / w) butyl acetate, 5-15% (w / w) PMMA micro powder, 0.3-0.5% (w / w) dispersant BYK163, 0.3-0.5% (w / w) leveling agent DIG450, and the remaining (w / w) hydroxyl acrylic resin; add the 20% (w / w) CAB381-2 aqueous solution, fumed silica, propylene glycol methyl ether acetate, butyl acetate, PMMA micro powder, dispersant BYK163, leveling agent DIG450, and hydroxyl acrylic resin sequentially into a reaction vessel, and stir at 25°C and 100 rpm for 2 hours to obtain component A;

[0007] Step 2: Take 50-70% of curing agent N3390 and make up the remaining mass fraction of butyl acetate; add the curing agent N3390 and the butyl acetate into the reactor and stir at 25°C and 100 rpm for 1 hour to obtain component B;

[0008] Step 3: Take 5-15% of the B component by mass and make up the remaining A component by mass; add the B component and the A component to the reactor in sequence and stir at 100 rpm for 1 hour to obtain the scratch-resistant polyurethane matte paint.

[0009] Furthermore, the 20% mass fraction CAB381-2 aqueous solution has a mass fraction of 8%.

[0010] Furthermore, the mass fraction of the fumed silica is 4%.

[0011] Furthermore, the mass fraction of the propylene glycol methyl ether acetate is 9.4%.

[0012] Furthermore, the mass fraction of the butyl acetate is 11.2%.

[0013] Furthermore, the PMMA micro powder has a mass fraction of 10.5%.

[0014] Furthermore, the dispersant BYK163 has a mass fraction of 0.4%.

[0015] Furthermore, the leveling agent, Digo 450, has a mass fraction of 0.4%.

[0016] Furthermore, the curing agent N3390 has a mass fraction of 60%.

[0017] Furthermore, the mass fraction of component B is 10.7%.

[0018] Furthermore, the PMMA micro powder has a fineness of 400 mesh.

[0019] On the other hand, the present invention provides a scratch-resistant polyurethane matte paint prepared by the method described above.

[0020] The present invention can bring the following beneficial effects:

[0021] The scratch-resistant polyurethane matte paint of this invention possesses a unique abrasion-dispersion effect system, exhibiting both high hardness and good dispersibility. In the formulation of this invention, by precisely controlling the amount and particle size of PMMA micropowder, combined with an acrylic resin system and other components such as fumed silica, a uniform and abrasion-resistant matte layer is formed in the paint film, enhancing its scratch and abrasion resistance. The components of this invention, prepared and proportioned using a unique process, synergistically create the abrasion-dispersion effect. It should be noted that the process parameters and drug ratios of this invention cannot be obtained through simple experiments and involve a degree of chance and inventiveness. Detailed Implementation

[0022] To more clearly illustrate the overall concept of the present invention, the overall solution of the present invention will be described in detail below by way of embodiments; in the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention; however, it will be apparent to those skilled in the art that the present invention may be practiced without one or more of these details; in other instances, some technical features known in the art have not been described in order to avoid confusion with the present invention.

[0023] In this invention, the reactor was purchased from Wenzhou Xinpai Machinery Co., Ltd., FYF type 50L, and 50L was fed each time; PMMA micro powder was purchased from Lingshou County Xucheng Mineral Products Processing Plant; CAB381-2 is Eastman CAB-381-2 cellulose acetate butyrate; propylene glycol methyl ether acetate CAS number: 108-65-6; butyl acetate CAS number: 123-86-4; hydroxy acrylic resin is Hypomer FS-2451; curing agent N3390 is German Bayer curing agent N3390; abrasion testing machine was purchased from Dongguan Jingyu Instrument Equipment Technology Co., Ltd., model JY-045; the test plate is an annular tin-plated tinplate with an outer diameter of 108mm and an inner diameter of 8mm; the diluent is Tushian polyurethane diluent.

[0024] Unless otherwise specified, all raw material components in the following examples are commercially available, all experimental instruments used are standard laboratory instruments, and the performance testing methods are those known in the art. The overall ambient temperature was 25°C, the air humidity was 40%, and ultraviolet light was avoided.

[0025] The preferred implementation method is as follows:

[0026] Example 1:

[0027] The preparation method of the scratch-resistant polyurethane matte paint is as follows:

[0028] Step 1: Take 8% by mass of a 20% by mass aqueous solution of CAB381-2, 4% by mass of fumed silica, 9.4% by mass of propylene glycol methyl ether acetate, 11.2% by mass of butyl acetate, 10.5% by mass of 400-mesh PMMA powder, 0.4% by mass of dispersant BYK163, 0.4% by mass of leveling agent DIG450, and the remaining mass of hydroxyl acrylic resin; add the 20% by mass aqueous solution of CAB381-2, fumed silica, propylene glycol methyl ether acetate, butyl acetate, PMMA powder, dispersant BYK163, leveling agent DIG450, and hydroxyl acrylic resin sequentially into a reaction vessel, and stir at 25°C and 100 rpm for 2 hours to obtain component A;

[0029] Step 2: Take 60% of curing agent N3390 by mass and make up the remaining mass fraction of butyl acetate; add the curing agent N3390 and the butyl acetate into the reaction vessel and stir at 25°C and 100 rpm for 1 hour to obtain component B;

[0030] Step 3: Take 10.7% of component B by mass and make up the remaining mass of component A; add component B and component A to the reactor in sequence and stir at 100 rpm for 1 hour to obtain the scratch-resistant polyurethane matte paint.

[0031] Example 2-13:

[0032] The only difference between Example 2 and Example 1 is that the mass fraction of the 20% CAB381-2 aqueous solution is 5%.

[0033] The only difference between Example 3 and Example 1 is that the mass fraction of the 20% CAB381-2 aqueous solution is 10%.

[0034] The only difference between Example 4 and Example 1 is that the mass fraction of propylene glycol methyl ether acetate is 5%.

[0035] The only difference between Example 5 and Example 1 is that the mass fraction of propylene glycol methyl ether acetate is 15%.

[0036] The only difference between Example 6 and Example 1 is that the mass fraction of butyl acetate is 5%.

[0037] The only difference between Example 7 and Example 1 is that the mass fraction of butyl acetate is 15%.

[0038] The only difference between Example 8 and Example 1 is that the mass fraction of PMMA micro powder is 5%.

[0039] The only difference between Example 9 and Example 1 is that the mass fraction of PMMA micro powder is 15%.

[0040] The only difference between Example 10 and Example 1 is that the mass fraction of curing agent N3390 is 50%.

[0041] The only difference between Example 11 and Example 1 is that the mass fraction of curing agent N3390 is 70%.

[0042] The only difference between Example 12 and Example 1 is that the mass fraction of component B is 5%.

[0043] The only difference between Example 13 and Example 1 is that the mass fraction of component B is 15%.

[0044] Comparative Examples 1-22:

[0045] The only difference between Comparative Example 1 and Example 1 is that the mass fraction of the 20% CAB381-2 aqueous solution is 2%.

[0046] The only difference between Comparative Example 2 and Example 1 is that the mass fraction of the 20% CAB381-2 aqueous solution is 20%.

[0047] The only difference between Comparative Example 3 and Example 1 is that the mass fraction of propylene glycol methyl ether acetate is 2%;

[0048] The only difference between Comparative Example 4 and Example 1 is that the mass fraction of propylene glycol methyl ether acetate is 25%.

[0049] The only difference between Comparative Example 5 and Example 1 is that the mass fraction of butyl acetate is 2%;

[0050] The only difference between Comparative Example 6 and Example 1 is that the mass fraction of butyl acetate is 25%.

[0051] The only difference between Comparative Example 7 and Example 1 is that the mass fraction of PMMA micro powder is 2%.

[0052] The only difference between Comparative Example 8 and Example 1 is that the mass fraction of PMMA micro powder is 25%.

[0053] The only difference between Comparative Example 9 and Example 1 is that the mass fraction of curing agent N3390 is 30%.

[0054] The only difference between Comparative Example 10 and Example 1 is that the mass fraction of curing agent N3390 is 85%.

[0055] The only difference between Comparative Example 11 and Example 1 is that the mass fraction of component B is 3%;

[0056] The only difference between Comparative Example 12 and Example 1 is that the mass fraction of component B is 25%.

[0057] The only difference between Comparative Example 13 and Example 1 is that the mass fraction of fumed silica is 1%;

[0058] The only difference between Comparative Example 14 and Example 1 is that the mass fraction of fumed silica is 10%.

[0059] The only difference between Comparative Example 15 and Example 1 is that the mass fraction of dispersant BYK163 is 0.1%;

[0060] The only difference between Comparative Example 16 and Example 1 is that the mass fraction of dispersant BYK163 is 1%;

[0061] The only difference between Comparative Example 17 and Example 1 is that the mass fraction of the leveling agent Tigo 450 is 0.1%;

[0062] The only difference between Comparative Example 18 and Example 1 is that the leveling agent, Tigo 450, has a mass fraction of 1%.

[0063] The only difference between Comparative Example 19 and Example 1 is that the PMMA micro powder has a mesh size of 60.

[0064] The only difference between Comparative Example 20 and Example 1 is that the PMMA micro powder has a mesh size of 1200.

[0065] The only difference between Comparative Example 21 and Example 1 is that the PMMA micro powder was replaced with an equal mass of pure water.

[0066] The only difference between Comparative Example 22 and Example 1 is that the scratch-resistant polyurethane matte paint was replaced with an equal amount of commercially available Tuscan polyurethane matte paint.

[0067] Prepare test panels with three times the number of examples, and coat each panel with the paint of each example in groups of three. Specifically, add 7 times the mass of thinner to each example paint, mix well, and then apply at a ratio of 0.15 ± 0.01 kg / m². 2 The density of the coating was brushed onto the surface of the corresponding test plate, baked at 75℃ for 40 minutes, and then left to cure for 7 days before testing the wear resistance and hardness.

[0068] Abrasion resistance test: The test board was tested using an abrasion testing machine with an H22 grinding wheel, a 500g weight, and a rotation speed of 70 rpm. After 90 seconds of testing, the mass of the test board worn was weighed and recorded. The wear amount was calculated as: Wear amount = Wear mass / (Mass of painted test board - Original mass of test board) × 100%. The result was accurate to one decimal place, in %; Hardness test: The test board was tested using a QHQ-A pencil hardness tester with a 500g pencil tip load. The pencil hardness of the coating was recorded, in H.

[0069] The results of the above experiments are shown in Table 1. The final result for each example is the median of the three experiments.

[0070] Table 1: Test results of abrasion resistance and hardness of the paint surface for each example:

[0071]

[0072] As can be seen from the data in Table 1, compared with other examples, the scratch-resistant polyurethane matte paint prepared by the embodiment of the present invention, especially the method of preparation of the scratch-resistant polyurethane matte paint of embodiment 1 of the present invention, has lower wear and higher hardness under the same usage amount and method of use; that is, the scratch-resistant polyurethane matte paint obtained by the present invention, especially the method of embodiment 1 of the present invention, has better wear resistance and hardness.

[0073] Since matte surfaces are achieved by using matte powder or wax powder, which floats on the surface to form a matte finish, these matte powder or wax powder particles have very low hardness and are easily scratched and flattened, increasing the gloss and thus damaging the matte effect with gloss marks. This invention improves the wear resistance and hardness of matte paint, making the paint surface more scratch-resistant and able to maintain its matte finish.

[0074] It should be noted that the above process parameters and effects have a non-linear correlation, and the compatibility with other components and processes of this invention should be considered. The above descriptions are merely embodiments of this invention and are not intended to limit the invention; various modifications and variations can be made to this invention by those skilled in the art; any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this invention should be included within the scope of the claims of this invention.

Claims

1. A method for preparing a scratch-resistant polyurethane matte varnish, characterized in that, The method for preparing the scratch-resistant polyurethane matte paint includes the following steps: Step 1: Take 8% by mass of a 20% by mass aqueous solution of CAB381-2, 4% by mass of fumed silica, 9.4% by mass of propylene glycol methyl ether acetate, 11.2% by mass of butyl acetate, 10.5% by mass of 400-mesh PMMA powder, 0.4% by mass of dispersant BYK163, 0.4% by mass of leveling agent DIG450, and the remaining mass of hydroxyl acrylic resin Hypomer FS-2451; add the 20% by mass aqueous solution of CAB381-2, fumed silica, propylene glycol methyl ether acetate, butyl acetate, PMMA powder, dispersant BYK163, leveling agent DIG450, and hydroxyl acrylic resin Hypomer FS-2451 sequentially into a reaction vessel, and stir at 25°C and 100 rpm for 2 hours to obtain component A; Step 2: Take 60% of curing agent N3390 by mass and make up the remaining mass fraction of butyl acetate; add the curing agent N3390 and the butyl acetate into the reaction vessel and stir at 25°C and 100 rpm for 1 hour to obtain component B; Step 3: Take 10.7% of component B by mass and make up the remaining mass of component A; add component B and component A to the reactor in sequence and stir at 100 rpm for 1 hour to obtain the scratch-resistant polyurethane matte paint.

2. A scratch-resistant polyurethane matte paint prepared by the method described in claim 1.

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