A water-based velvet-touch boiling-resistant coating and preparation method thereof

Abstract

The invention discloses a water-based velvet-touch and boiling-resistant paint and a preparation method thereof. The water-based velvet-touch and boiling-resistant paint comprises at least 30-40 parts by mass of polycarbonate, 30-40 parts by mass of polyurethane, 15-25 parts by mass of deionized water, 0.02-0.1 parts by mass of an aqueous solution of a foaming agent, 0.05-0.1 parts by mass of a foam stabilizer, 0.1-0.5 parts by mass of a first wetting agent, 0.1-0.5 parts by mass of a leveling agent, 0.1-0.5 parts by mass of a feel aid, 1-5 parts by mass of DPNB, 0.5-1 parts by mass of a second wetting agent, and 0.5-2 parts by mass of a thickener. The present invention forms a mixed network structure as shown in Figure 1 by mixing polyurethane (PUD) resin and polycarbonate resin in a ratio of 1:1, thereby increasing the cross-linking density, significantly improving the hardness, adhesion, and stain resistance of the product, and making the velvet texture of the paint film last longer. A small amount of silicone feel additive is added to the formula to increase the smoothness and make the velvet texture effect more obvious.

Description

Technical Field

[0001] The invention relates to the technical field of water-based velvet textured coatings, in particular to a water-based velvet touch boiling-resistant coating and a preparation method thereof. Background Art

[0002] Currently, the most popular water-based decorative paints are tactile paints. These products not only protect and decorate the substrate but also impart a distinctive tactile feel to the coating, creating a more comfortable and warm feel and adding a warmer touch to homes. Currently, water-based velvet-touch paints on the market are created by adding velvet powder to the paint. However, these paints exhibit poor adhesion, permeability, and stain resistance. This is primarily due to the fact that velvet powder has a limited effect in the paint system when added in small amounts, while excessive amounts can compromise the overall performance of the coating.

[0003] The tactile feel of water-based tactile coatings primarily stems from the topcoat (or clearcoat). Due to the low PVC content of this coating, the film is dense and well-sealed. Consequently, water-based tactile coatings generally exhibit poor boiling resistance. The boiling resistance test is an accelerated test used to assess a product's service life (test method GB / T17657-2013 (4.50)). Decorative panels painted with ordinary water-based tactile coatings often blister and flake when placed in boiling water for two hours, indicating a poor coating lifespan. Experimental observations show that flakes typically occur due to bubbling and shedding of the coating on the panels, indicating that the blistering originates from within and outside the panel, rather than from direct erosion of the coating by water vapor. Analysis suggests that during boiling, water vapor enters and exits the coating from the edges and back of the panel. The vapor pressure can rupture the intact paint film, disrupting the coating's continuity and sealing properties, rendering the protective coating ineffective and detrimental. Summary of the Invention

[0004] The purpose of the present invention is to provide a water-based velvet-touch and boiling-resistant coating in view of the fact that the addition of velvet powder in the coating in the prior art affects the coating performance and has an unsatisfactory coating service life.

[0005] Another object of the present invention is to provide a method for preparing the water-based velvet-touch boiling-resistant coating.

[0006] Another object of the present invention is to provide a decorative board coated with the water-based velvet-touch boiling-resistant paint.

[0007] The technical solution adopted to achieve the purpose of the present invention is:

[0008] A water-based velvet-touch, boiling-resistant paint comprises at least 30-40 parts by mass of polycarbonate, 30-40 parts by mass of polyurethane, 15-25 parts by mass of deionized water, 0.02-0.1 parts by mass of an aqueous solution of a foaming agent, 0.02-0.1 parts by mass of a foam stabilizer, 0.1-0.5 parts by mass of a first wetting agent, 0.1-0.5 parts by mass of a leveling agent, 0.1-0.5 parts by mass of a feel aid, 1-5 parts by mass of DPNB, 0.5-1 parts by mass of a second wetting agent, and 0.5-2 parts by mass of a thickener.

[0009] In the above technical solution, the mass ratio of the polyurethane to the polycarbonate is 1:1.

[0010] In the above technical solution, the mass ratio of the foaming agent to the foam stabilizer is 1:2.

[0011] In the above technical solution, the foaming agent is sodium α-olefin sulfonate. Preferably, the mass fraction of sodium α-olefin sulfonate in the aqueous solution of sodium α-olefin sulfonate is 50%.

[0012] In the above technical solution, the foam stabilizer is coconut oil fatty acid diethanolamide.

[0013] Another aspect of the present invention provides a method for preparing the water-based velvet-touch boiling-resistant coating, comprising the following steps:

[0014] Step 1: adding polycarbonate and polyurethane to a disperser in a stationary state, then starting the disperser, and adding a first wetting agent, a leveling agent, DPNB, a hand feel aid, and deionized water in sequence after the dispersion rate reaches a first predetermined speed, and stirring for 20 minutes;

[0015] Step 2, adjusting the speed to a second predetermined speed, adding dropwise the aqueous solution of the foaming agent and the foam stabilizer and stirring for 3 minutes;

[0016] Step 3, adjusting the rotation speed to a third predetermined rotation speed, adding a second wetting agent, stirring evenly, and then adding deionized water and a thickener to adjust the viscosity to obtain the water-based velvet touch boiling-resistant paint.

[0017] In the above technical solution, the first predetermined speed is 500-600 rpm / min, the second predetermined speed is 1000-1200 rpm / min, and the third predetermined speed is 200-300 rpm / min;

[0018] The deionized water in step 1 is 12-22 parts by mass, the deionized water in step 3 is 2-5 parts by mass, and the total amount of deionized water is 15-25 parts by mass.

[0019] In the above technical solution, the dropping speed of the foaming agent and the foam stabilizer in step 2 is 4-8 drops / min.

[0020] In the above technical solution, the viscosity in step 3 is 65-70KU / 25°C.

[0021] Another aspect of the present invention provides a decorative board coated with the water-based velvet-touch boiling-resistant paint.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention forms a mixture of polyurethane PUD resin and polycarbonate resin in a ratio of 1:1. Figure 1 The mixed network structure shown increases the cross-linking density, significantly improving the product's hardness, adhesion, and stain resistance, while also making the paint film's velvety texture last longer. A small amount of silicone tactile additive is added to the formula to increase the smoothness and make the velvet texture effect more pronounced.

[0024] 2. The water-based velvet touch coating of the present invention is a semi-open system. A foaming agent and a foam stabilizer are added through formula design to form stable microbubbles in the coating. These microbubbles are superimposed on each other, and some of the superimposed microbubbles penetrate the entire coating to form "capillaries" in the coating. When boiled in water, the water vapor in the substrate can release pressure outward through the "capillaries" in the coating, and the steam pressure is discharged into the boiling water, so that the internal and external pressures of the decorative board in the boiling water reach a balance, so as not to affect the adhesion of the decorative coating. At the same time, when the external pressure is higher than the internal pressure, due to the presence of air in the capillaries, when the external water vapor enters the capillaries, it will compress the air in the capillaries, and the compressed air will generate pressure. When the pressure reaches an internal and external balance, the volume of the air in the capillaries no longer changes. This layer of air isolates the external water vapor, thereby achieving the effect of protecting the base.

[0025] 3. The coating formed by the water-based velvet touch paint of the present invention has excellent water boiling resistance. According to the water boiling test of GB / T17657-2013 (4.50), the paint film does not bubble, lose gloss, or wrinkle, and the adhesion remains unchanged. The foaming agent produces a large number of microbubbles in the coating system. These microbubbles form a stable microbubble structure under the interaction of the foam stabilizer and the thickener. The sample is prepared by spraying and then cured (cured for 7 days under standard conditions). In the experiment, the sample with the paint film was boiled in hot water. The paint film did not bubble, lose gloss, or wrinkle, and the adhesion remained unchanged. Therefore, this coating system can be used for interior / exterior wall decorative panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Shown is a schematic diagram of the interpenetrating network molecular structure of polyurethane and polycarbonate.

[0027] Figure 2Shown is a surface SEM image of a decorative panel coated with a water-based velvet-touch, boil-resistant paint.

[0028] Figure 3 Shown is a surface SEM image of a decorative panel coated with existing paint.

[0029] Figure 4 shows the actual pictures of the decorative board coated with the existing coating before and after the boiling test, where: Figure 4A Before the boiling experiment, Figure 4B After the boiling experiment, Figure 4C for Figure 4B A partial enlarged view of .

[0030] Figure 5 shows the actual pictures of the decorative board coated with water-based velvet touch boiling-resistant paint before and after the boiling test, where: Figure 5A Before the boiling experiment, Figure 5B After the boiling experiment. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] The raw materials used in the specific implementation of the present invention are shown in Table 1.

[0033] Table 1 Components and their manufacturers and models

[0034]

[0035]

[0036] Among them, the AOS / 92 produced by China National Light Industry and Chemical Industry Co., Ltd. needs to be configured into a 50% AOS / 92 aqueous solution, and the mass ratio of AOS / 92 to water is 1:1. In the subsequent examples, AOS / 92 uses a 50% AOS / 92 aqueous solution.

[0037] Example 1

[0038] Different ratios of polyurethane and polycarbonate were tested to determine the optimal ratio. Specifically, a water-based velvet-touch, boiling-resistant coating was prepared by the following method:

[0039] Step 1: Add polycarbonate and polyurethane to a disperser in a static state, then start the disperser, and after the dispersion rate reaches 500-600 rpm / min, add the first wetting agent, leveling agent, DPNB, feel additive and deionized water in sequence and stir for 20 minutes;

[0040] Step 2: adding the foaming agent and foam stabilizer dropwise at a speed of 1000-1200 rpm and stirring for 3 minutes;

[0041] Step 3: adjusting the rotation speed to 200-300 rpm / min, adding a second wetting agent, stirring evenly, adding deionized water and a thickener to adjust the viscosity to 65-70 KU / 25° C. to obtain the water-based velvet-touch boiling-resistant coating.

[0042] The components and product properties are shown in Table 2.

[0043] Table 2 Performance of products made from polycarbonate and polyurethane at different mass ratios

[0044]

[0045] Example 2

[0046] On the basis of Example 1, different mass ratios of foaming agent and foam stabilizer were tested to determine the optimal ratio. Specifically, a water-based velvet touch boiling-resistant coating was prepared by the following method:

[0047] Step 1: Add polycarbonate and polyurethane to a disperser in a static state, then start the disperser, and after the dispersion rate reaches 500-600 rpm / min, add the first wetting agent, leveling agent, DPNB, feel additive and deionized water in sequence and stir for 20 minutes;

[0048] Step 2: adding the foaming agent and foam stabilizer dropwise at a speed of 1000-1200 rpm and stirring for 3 minutes;

[0049] Step 3: adjusting the rotation speed to 200-300 rpm / min, adding a second wetting agent, stirring evenly, adding deionized water and a thickener to adjust the viscosity to 65-70 KU / 25° C. to obtain the water-based velvet-touch boiling-resistant coating.

[0050] The components and product properties are shown in Table 3.

[0051] Table 3 Performance of products made from polycarbonate and polyurethane at different mass ratios

[0052]

[0053] Example 3

[0054] Based on Examples 1-2, the optimal addition rates of the foaming agent and the foam stabilizer were studied. Specifically, a water-based velvet-touch, boiling-resistant coating was prepared by the following method:

[0055] Step 1: Add polycarbonate and polyurethane to a disperser in a stationary state, then start the disperser, and after the disperser reaches 500-600 rpm / min, add the first wetting agent, leveling agent, DPNB, feel additive and deionized water in sequence and stir for 20 minutes;

[0056] Step 2: adding the foaming agent and foam stabilizer dropwise at a speed of 1000-1200 rpm and stirring for 3 minutes;

[0057] Step 3: adjusting the rotation speed to 200-300 rpm / min, adding a second wetting agent, stirring evenly, adding deionized water and a thickener to adjust the viscosity to 65-70 KU / 25° C. to obtain the water-based velvet-touch boiling-resistant coating.

[0058] The different addition rates of foaming agent and foam stabilizer and their corresponding effects are shown in Table 4.

[0059] Table 4 Different addition rates of foaming agent and foam stabilizer and corresponding effects

[0060]

[0061]

[0062] It can be seen from Table 4 that when the drop rate is 4-8 drops / min, a water-based velvet touch and boiling-resistant coating can be formed. The water-based velvet touch and boiling-resistant coating prepared at 6 drops / min has the best effect, the bubbles are evenly distributed, and a good semi-open capillary system can be formed.

[0063] Example 4

[0064] A decorative panel coated with a water-based velvet-touch, boiling-resistant paint. The matching coating and base surface treatment of the decorative panel are shown in Table 5.

[0065] Table 5 Decorative board supporting coating and base surface treatment

[0066]

[0067] Using existing coatings as a comparison, SEM tests were conducted on decorative panels coated with water-based velvet touch and boiling-resistant coatings and decorative panels coated with existing coatings. The test results are as follows: Figure 2-3 As shown, a large number of microbubbles are stably present in the coating system by adding a foaming agent. These microbubbles form a stable microbubble system under the interaction of the foam stabilizer and the thickener. After the paint film is formed, the spherical microstructure is stabilized in the paint film.

[0068] Decorative panels coated with the prepared water-based velvet-touch, boiling-resistant coating and those coated with conventional coatings were subjected to a 2-hour boiling test according to the GB / T17657-2013 (4.50) method to test the coating's boiling resistance. The test results, shown in Figures 4-5, show significant bubbling on the decorative panels coated with the conventional coating, while the panels coated with the water-based velvet-touch, boiling-resistant coating remained unaffected.

[0069] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A water-based velvet touch boiling-resistant paint, characterized in that: The invention comprises at least 30-40 parts by mass of polycarbonate, 30-40 parts by mass of polyurethane, 15-25 parts by mass of deionized water, 0.02-0.1 parts by mass of an aqueous solution of a foaming agent, 0.02-0.1 parts by mass of a foam stabilizer, 0.1-0.5 parts by mass of a first wetting agent, 0.1-0.5 parts by mass of a leveling agent, 0.1-0.5 parts by mass of a feel aid, 1-5 parts by mass of DPNB, 0.5-1 parts by mass of a second wetting agent, and 0.5-2 parts by mass of a thickener; The mass ratio of the polyurethane to the polycarbonate is 1:1; The mass ratio of the foaming agent to the foam stabilizer is 1:2; The foaming agent is sodium α-olefin sulfonate, and the mass fraction of sodium α-olefin sulfonate in the aqueous solution of sodium α-olefin sulfonate is 50%; The foam stabilizer is coconut oil fatty acid diethanolamide.

2. A method for preparing the water-based velvet-touch boiling-resistant paint according to claim 1, characterized in that: The following steps are involved: Step 1: adding polycarbonate and polyurethane to a disperser in a stationary state, then starting the disperser, and adding a first wetting agent, a leveling agent, DPNB, a hand feel aid, and deionized water in sequence after the dispersion rate reaches a first predetermined speed, and stirring for 20 minutes; Step 2, adjusting the speed to a second predetermined speed, adding dropwise the aqueous solution of the foaming agent and the foam stabilizer and stirring for 3 minutes; Step 3, adjusting the rotation speed to a third predetermined rotation speed, adding a second wetting agent, stirring evenly, and then adding deionized water and a thickener to adjust the viscosity to obtain the water-based velvet touch boiling-resistant paint.

3. The preparation method according to claim 2, wherein The first predetermined speed is 500-600 rpm / min, the second predetermined speed is 1000-1200 rpm / min, and the third predetermined speed is 200-300 rpm / min; The deionized water in step 1 is 12-22 parts by mass, the deionized water in step 3 is 2-5 parts by mass, and the total amount of deionized water is 15-25 parts by mass.

4. The preparation method according to claim 2, wherein In step 2, the dropping speed of the foaming agent and the foam stabilizer is 4-8 drops / min.

5. The preparation method according to claim 2, wherein The viscosity in step 3 is 65-70 KU / 25°C.

6. A decorative panel, characterized in that: The water-based velvet-touch boiling-resistant paint according to claim 1 is coated.

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