A kind of imitation porcelain crack effect midcoat and its preparation method

Abstract

The application provides a kind of imitation porcelain crack effect intermediate coating and preparation method thereof, and relates to the field of paint.The intermediate coating comprises the following raw materials by weight fraction: polyvinyl alcohol 20-30 parts, water 63.7-76.5 parts, additives 1.3-1.8 parts, and fillers 2-5 parts.The preparation method is as follows: polyvinyl alcohol, water and defoaming agent are dispersed at 1500-2000 rpm for 15-30 min;fillers and thickening agents are then added and dispersed at 1500-2000 rpm for 15-30 min;the remaining additives are then added and dispersed at 500-800 rpm for 5-10 min.The intermediate coating provided by the application produces cracks by uneven shrinkage of a single topcoat layer, unlike traditional crack paint which produces cracks by shrinkage rate differences between topcoat and basecoat layers.The intermediate coating can be used with different topcoats and basecoats, has a wide range of applications, and can produce a greater variety of crack effects.

Description

Technical Field

[0001] This invention relates to the field of coatings, and more specifically, to a mid-coat coating with a porcelain crackle effect and its preparation method. Background Technology

[0002] Crackle paint is a unique interior wall decoration material that has gradually emerged in the building decoration industry in recent years and is increasingly favored by users. With its distinctive artistic charm and unique decorative effect, it has become an indispensable part of high-end home decoration.

[0003] Existing crackle paints for interior walls typically consist of two parts: a base coat and a top coat. The base coat is a relatively flexible resin, while the top coat contains more pigments and fillers and less resin. This makes the top coat prone to shrinkage during drying. When the shrinkage rate of the top coat is greater than that of the base coat, stress is generated within the coating. When this stress exceeds the tensile strength of the coating material, cracks will form. By combining a soft base coat and a hard top coat, the different shrinkage rates of the base and top coat can be achieved, causing stress-induced cracking and creating the cracked effect.

[0004] However, the materials used in existing crackle paints are oil-based, which has a significant environmental impact and is not suitable for home interior decoration. Furthermore, the selection of primers and topcoats is limited. Crackle paints on the market are generally sold as a set, so the resulting crackle effect and feel are limited by the products available, resulting in a small range of crackle effects to choose from. Summary of the Invention

[0005] The purpose of this invention is to provide a mid-coat coating with a porcelain crackle effect, which enables the topcoat to lose water rapidly and unevenly. The different shrinkage rates of the inner and outer parts of the topcoat itself produce a crackle effect, and it is applicable to most topcoats on the market.

[0006] The technical problem solved by this invention is achieved by the following technical solution.

[0007] On one hand, embodiments of the present invention provide a mid-coat coating with a porcelain crackle effect, comprising the following raw materials by weight: 20-30 parts of polyvinyl alcohol, 63.7-76.5 parts of water, 1.3-1.8 parts of additives, and 2-5 parts of filler.

[0008] In some embodiments of the present invention, the average degree of polymerization of the polyvinyl alcohol is 1000-2000. It should be noted that in the present invention, the average degree of polymerization of the polyvinyl alcohol used is 1000-2000. Within this range, the intermediate coating is easily atomized, facilitating application, and will not sag after application to the wall surface. However, when the degree of polymerization is below 1000, sag is likely to occur. When the degree of polymerization is above 2000, more water needs to be added to reduce the viscosity of the intermediate coating to achieve atomization, making application inconvenient.

[0009] In some embodiments of the present invention, the degree of polymerization of the polyvinyl alcohol is 1500. At this degree of polymerization, the atomization performance and thermal storage of the intermediate coating are optimal.

[0010] In some embodiments of the present invention, the above-mentioned additives comprise the following raw materials by weight: 0.1-0.4 parts of defoamer, 0.2-0.4 parts of preservative and mildew inhibitor, and 0.5-1.5 parts of thickener. In the present invention, the total amount of defoamer, preservative and mildew inhibitor, and thickener is the total amount of additives.

[0011] Defoamers effectively inhibit the formation of bubbles in coatings, reducing or eliminating bubbles and foam, thus ensuring the smoothness and evenness of the coating surface. Furthermore, the addition of defoamers prevents uneven coating application caused by bubbles, reducing the number of coats and improving efficiency. Defoamers also stabilize bubbles in the coating, preventing their regeneration and improving product stability and durability.

[0012] Anti-corrosion and anti-mildew agents have a dual function of preventing mold and corrosion. On the one hand, they effectively inhibit microorganisms in coatings, such as bacteria, fungi, and yeasts, eliminating mold and stopping its growth. By inhibiting the metabolism and transaminase system of mold, they disrupt the function and energy release system of mold cells, thus achieving an anti-mildew effect. On the other hand, they prevent coatings from becoming moldy and deteriorating, thereby extending the storage and usage time of the coatings. Simultaneously, they do not affect the coating itself, are easily soluble in water, and have good compatibility with various surfactants and other chemical raw materials, without negatively impacting the various properties of the coating.

[0013] Thickeners increase viscosity, making paint easier to apply, reducing sagging and dripping, and improving work efficiency. They also increase the adhesion between the paint and the wall, making it less prone to peeling. Furthermore, thickeners can alter the rheological properties of paint, adapting it to different application methods and processes, ensuring paint uniformity and workmanship quality.

[0014] In some embodiments of the present invention, the defoamer is a polyether defoamer, such as: Sanopco SN-318, BYK 012, and Haichuan 8034A. A preferred defoamer is BYK-012.

[0015] In some embodiments of the present invention, the above-mentioned preservative and antifungal agent is one of isothiazolinones, formaldehyde-releasing agents, and benzylimidazoles, such as Sol ActiveIDE MV Arxada's Polyphasus 7026, Dow's BIT20, and Hoffmann's MBS5050. MBS 5050 is a preferred preservative and antifungal agent.

[0016] In some embodiments of the present invention, the thickener is an acrylic alkali-swellable thickener, such as Dow's TT-615 and TT-935, and Wanhua's A401 and A801. More preferably, the thickener is ASE-60.

[0017] In some embodiments of the present invention, the filler is diatomaceous earth. In this invention, diatomaceous earth is used as a filler; by utilizing its porous structure and controlling the amount added, the intermediate coat can achieve the desired water absorption effect, and the adhesion of the topcoat can be improved.

[0018] On the other hand, embodiments of the present invention provide a method for preparing a mid-coat paint with a porcelain crackle effect, comprising the following steps:

[0019] S1, disperse polyvinyl alcohol, water and defoamer at 50-60℃ and 1500-2000rpm at high speed for 15min-30min;

[0020] S2, then add filler and thickener, and disperse at high speed at 1500-2000 rpm for 15-30 minutes;

[0021] S3, then add the remaining additives and disperse at 500-800 rpm for 5-10 minutes.

[0022] In preparing the intermediate coating of the present invention, polyvinyl alcohol is first dispersed under high-speed stirring, which can fully disperse the polyvinyl alcohol and facilitate mixing with other raw materials.

[0023] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0024] The intermediate coating provided by this invention has good water absorption. When used, this intermediate coating is applied to the primer surface, followed by the topcoat. The intermediate coating rapidly absorbs moisture from the topcoat. As the moisture content in the topcoat decreases rapidly, the topcoat shrinks in volume. The magnitude of this shrinkage depends on the distance of the topcoat material from the intermediate coating layer. The side closer to the intermediate coating (i.e., the side in contact with the topcoat) experiences faster moisture loss and greater shrinkage; the side farther away (i.e., the outermost edge of the topcoat) experiences less water loss and smaller shrinkage. Due to the difference in shrinkage rates between the inner and outer layers of the topcoat, uneven shrinkage occurs within the topcoat layer, creating a stress difference and ultimately resulting in a cracked effect. Compared to traditional crackle paint, which relies on the difference in shrinkage rates between the topcoat and primer layers to produce a crack effect, the intermediate coating provided by this invention creates cracks through uneven shrinkage of a single topcoat layer. It is applicable to different topcoats and primers, has a wide range of uses, and can produce a greater variety of cracked effects. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a crack effect diagram of Embodiment 1 of the present invention;

[0027] Figure 2 This is a crack effect diagram of Embodiment 2 of the present invention;

[0028] Figure 3 This is a crack effect diagram of Embodiment 3 of the present invention;

[0029] Figure 4 This is a crack effect diagram of Comparative Example 1 of the present invention;

[0030] Figure 5 This is a crack effect diagram of Comparative Example 2 of the present invention;

[0031] Figure 6 This is a crack effect diagram of Comparative Example 3 of the present invention;

[0032] Figure 7 This is a crack effect diagram of Comparative Example 4 of the present invention;

[0033] Figure 8 This is a crack effect diagram of Comparative Example 5 of the present invention; Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to specific embodiments.

[0036] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0037] Example 1

[0038] The intermediate coating of this embodiment is prepared according to the following method.

[0039] S1: Place 25 parts polyvinyl alcohol, 68.35 parts water, and 0.3 parts defoamer (BYK-012) in container A. Disperse at high speed of 1500-2000 rpm for 30 minutes until it is fully opened. When the mixer is stirring, the temperature inside the mixer is 50℃. Set aside for later use.

[0040] S2: Add 5 parts of diatomaceous earth (Yiruishi (Shanghai) Investment Management Co., Ltd. 499) and 1 part of thickener (Dow's ASE-60) to container A, and disperse at high speed at 1500-2000 rpm for 30 min;

[0041] S3: Add 0.35 parts of bactericide and preservative (Hoffmann's MBS 5050) and stir at 500-800 rpm for 10 minutes to obtain the finished product.

[0042] In this embodiment, the average degree of polymerization of polyvinyl alcohol is 1500.

[0043] Example 2

[0044] S1: Place 20 parts of polyvinyl alcohol, 76.2 parts of water, and 0.1 parts of defoamer in container A, and disperse at high speed of 1500-2000 rpm for 15-30 minutes until it is fully opened. The temperature inside the mixer should be 50℃ when the mixer is stirring. Set aside for later use.

[0045] S2: Add 2 parts diatomaceous earth and 1.5 parts thickener to container A, and disperse at high speed of 1500-2000 rpm for 15-30 minutes;

[0046] S3: Add 0.2 parts of bactericide and preservative, and stir at 500-800 rpm for 5-10 minutes to obtain the finished product.

[0047] The raw materials used in this embodiment are the same as those used in Example 1.

[0048] Example 3

[0049] S1: Place 30 parts of polyvinyl alcohol, 63.7 parts of water, and 0.4 parts of defoamer in container A, and disperse at high speed of 1500-2000 rpm for 15-30 minutes until it is fully opened. The temperature inside the mixer should be 50℃ when the mixer is stirring. Set aside for later use.

[0050] S2: Add 5 parts diatomaceous earth and 0.5 parts thickener to container A, and disperse at high speed of 1500-2000 rpm for 15-30 minutes;

[0051] S3: Add 0.4 parts of bactericide and preservative, and stir at 500-800 rpm for 5-10 minutes to obtain the finished product.

[0052] The raw materials used in this embodiment are the same as those used in Example 1.

[0053] Comparative Example 1

[0054] The difference from Example 1 is that, in this comparative example, the degree of polymerization of polyvinyl alcohol in step S1 is 500. The remaining raw materials and steps are the same as in Example 1.

[0055] Comparative Example 2

[0056] The difference from Example 1 is that, in this comparative example, the degree of polymerization of polyvinyl alcohol in step S1 is 2500. The remaining raw materials and steps are the same as in Example 1.

[0057] Comparative Example 3

[0058] The difference from Example 1 is that, in this comparative example, the diatomaceous earth in step S2 is replaced with heavy calcium carbonate. The remaining raw materials and steps are the same as in Example 1.

[0059] Comparative Example 4

[0060] The difference from Example 1 is that, in this comparative example, bentonite is used as the thickener in step S2. The remaining raw materials and steps are the same as in Example 1.

[0061] Comparative Example 5

[0062] The difference from Example 1 is that no thickener is added in step S2 in this comparative example. The remaining raw materials and steps are the same as in Example 1.

[0063] Experimental Example

[0064] 1. Taking the intermediate coatings of Examples 1-2 and Comparative Examples 1-5 as examples, the atomization, flowability and heat storage properties of each intermediate coating were investigated, and the results are shown in Table 1.

[0065] Table 1 Performance of intermediate coatings in Examples 1-2 and Comparative Examples 1-5

[0066]

[0067]

[0068] Among them, atomization performance is measured by using a wet film thickness gauge to measure the wet film thickness at different points on the test board after spraying, referring to the international standard ISO2808 "Paints and varnishes - Determination of film thickness". The greater the difference in thickness, the worse the atomization effect, thus evaluating the atomization uniformity of the spray.

[0069] Sagging property is assessed by spraying the same quality of paint onto a board of the same area, then tilting the board at a 60° angle and observing how the paint flows on the inclined board.

[0070] The thermal storage condition is based on the condition in the container as specified in GB / T9756 "Synthetic Resin Emulsion Interior Wall Coatings". The coating is stored in a 50℃ oven for 7 days, and then placed under standard conditions. After the temperature recovers to 25℃, the condition of the coating is observed to evaluate the thermal storage performance of the product.

[0071] Table 1 shows that, compared with Example 1 and Comparative Examples 1-2, the polyvinyl alcohol coating with a degree of polymerization of 500 used in Comparative Example 1 is easy to atomize, but prone to sagging; while the polyvinyl alcohol with a degree of polymerization of 2500 used in Comparative Example 2 has high viscosity and poor atomization during spraying, resulting in uneven coating distribution, which in turn leads to uneven water absorption and uneven cracking, with some parts having cracks and some not.

[0072] As shown in Comparative Example 3, diatomaceous earth can enhance the water absorption rate of the paint film, resulting in better cracking performance, and it can also improve the adhesion to the next coating layer.

[0073] As can be seen from Comparative Examples 4-5, without the addition of thickener, the paint film is prone to sagging after spraying, while adding bentonite will result in a jelly-like state, which becomes granular after stirring.

[0074] The embodiments 1-3 provided by the present invention have good atomization performance, and when sprayed on the surface of the primer, there is no sagging phenomenon, and the heat storage performance is excellent.

[0075] 2. Using the intermediate coats of Examples 1-3 and Comparative Examples 1-5 as examples, on a simulated wall substrate, first apply primer A (Carpoly Art Paint Multi-functional Fresh Primer KRD0014, diluted with 10% water) by roller and let it dry completely. Then spray on the intermediate coat (diluted with 10% water), followed by spraying on the high PVC topcoat (Carpoly Odorless Wall Paint JAC3000, diluted with 30% water). After standing for 12 hours, observe the crack effect. The crack effect diagram is attached. Figure 1-8 As shown.

[0076] From the appendix Figure 1-3 It can be seen that the cracked wall surfaces obtained by the intermediate coatings in Examples 1-3 have uniform and regular cracks, and the visual effect is similar to porcelain cracks. In contrast, the cracks in Comparative Examples 1-5 are uneven, vary in size, and show dripping, and do not have the effect of porcelain cracks.

[0077] In summary, the intermediate coating provided in this embodiment of the invention has good water absorption. When used, this intermediate coating is applied to the primer surface, followed by the topcoat. The intermediate coating rapidly absorbs moisture from the topcoat. As the moisture content in the topcoat decreases rapidly, the topcoat undergoes volume shrinkage. The magnitude of this shrinkage depends on the distance of the topcoat material from the intermediate coating layer. The side closer to the intermediate coating layer (i.e., the side in contact with the topcoat) experiences faster moisture loss and greater volume shrinkage; the side farther away (i.e., the outermost edge of the topcoat) shows less water loss and smaller volume shrinkage. Due to the difference in volume shrinkage rates between the inner and outer layers of the topcoat, uneven shrinkage occurs within the topcoat layer, creating a stress difference and ultimately resulting in a cracked effect. Compared to traditional crackle paint, which relies on the difference in shrinkage rates between the topcoat and primer layers to produce a cracked effect, the intermediate coating provided by this invention uses uneven shrinkage rates within a single topcoat layer to produce cracks. It is applicable to different topcoats and primers, has a wide range of uses, and can produce a greater variety of cracked effects.

[0078] The embodiments described above are some, but not all, embodiments of the present invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A mid-coat paint with a porcelain crackle effect, characterized in that, The raw materials include the following by weight: 20-30 parts polyvinyl alcohol, 63.7-76.5 parts water, 1.3-1.8 parts additives, and 2-5 parts filler; The degree of polymerization of the polyvinyl alcohol is 1000-2000; The thickener is an acrylic alkali-swellable thickener. The filler is diatomaceous earth; The additives comprise the following raw materials by weight: 0.1-0.4 parts of defoamer, 0.2-0.4 parts of preservative and mildew inhibitor, and 0.5-1.5 parts of thickener.

2. The intermediate coating for imitating porcelain crackle effect according to claim 1, characterized in that, The degree of polymerization of the polyvinyl alcohol is 1500.

3. The intermediate coating for imitating porcelain crackle effect according to claim 1, characterized in that, The defoamer is a mixture of polyether organosilicon mineral oil.

4. The intermediate coating for imitating porcelain crackle effect according to claim 1, characterized in that, The preservative and antifungal agent is one of isothiazolinones, formaldehyde-releasing agents, or benzimidazoles.

5. A method for preparing a mid-coat paint with a porcelain crackle effect as described in any one of claims 1-4, comprising the following steps: S1, disperse polyvinyl alcohol, water and defoamer at 1500-2000 rpm for 15-30 minutes; S2, then add filler and thickener, and disperse at 1500-2000 rpm for 15-30 minutes; S3, then add the remaining additives and disperse at 500-800 rpm for 5-10 minutes.

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