High-hardness wear-resistant quick-drying water-based finish paint and preparation method thereof

Abstract

The invention relates to the technical field of water-based finish paint, in particular to high-hardness wear-resistant quick-drying water-based finish paint and a preparation method thereof, and the high-hardness wear-resistant quick-drying water-based finish paint comprises a hydroxy acrylic resin composition and a curing agent composition, the hydroxy acrylic resin composition at least comprises the following preparation raw materials in parts by weight: 40-50 parts of hydroxy acrylic dispersion, 30-40 parts of titanium dioxide slurry, 5-20 parts of water-based silica sol, 2-8 parts of an inorganic additive, 5-20 parts of an auxiliary agent and 2-10 parts of water, and the viscosity of the hydroxy acrylic dispersion at 25 DEG C is 100-3000mPa. S; the curing agent composition at least comprises an isocyanate curing agent, and the product is environmentally friendly, high in hardness, good in wear resistance, high in drying speed and long in activation period, and can well meet the requirements of woodware coating finish paint construction and application.

Description

Technical Field

[0001] The invention relates to the technical field of water-based topcoats, in particular to a high-hardness, wear-resistant, quick-drying water-based topcoat and a preparation method thereof. Background Art

[0002] With the development of my country's social economy, oil-based paints are gradually being replaced by water-based paints in the furniture market due to problems such as poor environmental protection, high VOC content, and poor construction environment. However, water-based paints, especially water-based topcoats, are prone to problems such as poor hardness, poor wear resistance, and slow drying. Therefore, improving the wear resistance and hardness of water-based topcoats is currently a major research direction for water-based wood paints. A Chinese patent application (publication number CN116162402A) discloses a water-based matte, scratch-resistant, and wear-resistant wood paint and a preparation method thereof. The invention mainly adopts a compounding method of a modified water-based polyurethane emulsion and a water-based matte polyurethane emulsion, combined with other raw materials in the system, to prepare a water-based matte, scratch-resistant, and wear-resistant wood paint with low gloss and high mechanical properties. However, it is impossible to simultaneously ensure that the drying speed and pot life of the product meet the requirements of actual production and construction, which limits its large-scale industrial production and application. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a high-hardness, wear-resistant and quick-drying water-based topcoat. The product is green and environmentally friendly, has high hardness and good wear resistance, and at the same time, has a fast drying speed and a long activation period, which can well meet the construction and application requirements of wood coating topcoat.

[0004] On one hand, the present invention provides a high-hardness, wear-resistant, and quick-drying water-based topcoat, comprising a hydroxylated acrylic resin composition and a curing agent composition. The raw materials for preparing the hydroxylated acrylic resin composition comprise, by weight, at least: 40-50 parts of a hydroxylated acrylic dispersion, 30-40 parts of titanium dioxide slurry, 5-20 parts of an aqueous silica sol, 2-8 parts of an inorganic additive, 5-20 parts of an auxiliary agent, and 2-10 parts of water. The viscosity of the hydroxylated acrylic dispersion at 25° C. is 100-3000 mPa·s. The curing agent composition comprises at least an isocyanate curing agent.

[0005] In one embodiment, the additives include at least 0.2-0.3 parts of a leveling agent, 1-3 parts of a wetting and dispersing agent, 4-8 parts of a film-forming aid, 0.5-1 parts of a defoaming agent, 0.1-0.5 parts of a preservative, 0.1-0.5 parts of an amine neutralizer, 0.1-0.3 parts of a thickener, 0.5-1 parts of wax powder, 1-6 parts of a matting agent, and 2-5 parts of a hand wax.

[0006] In one embodiment, the raw materials for preparing the hydroxy acrylic resin composition include, by weight: 45 parts of hydroxy acrylic dispersion, 35 parts of titanium dioxide slurry, 5 parts of aqueous silica sol, 5 parts of aluminum oxide, 16.5 parts of additives, and 3 parts of water.

[0007] In one embodiment, the additives include, by weight: 0.2 parts of leveling agent, 1.8 parts of wetting and dispersing agent, 5.5 parts of film-forming aid, 0.8 parts of defoaming agent, 0.1 parts of preservative, 0.1 parts of amine neutralizer, 0.2 parts of thickener, 0.8 parts of wax powder, 5 parts of matting powder and 3 parts of hand wax.

[0008] In one embodiment, the mass ratio of the hydroxy acrylic acid dispersion, the inorganic additive and the aqueous silica sol is (8-10):1:1.

[0009] In one embodiment, the hydroxylated acrylic dispersion comprises at least the following components, calculated by mass percentage: 39-43% of hydroxylated acrylic acid ester polymer, 7-9% of propylene glycol butyl ether, and the balance made up of water.

[0010] In one embodiment, the brand of the hydroxylated acrylic dispersion is Huangshan Liangu 0828C.

[0011] In one embodiment, the particle size D50 of the inorganic additive is 0.5-10 μm.

[0012] In one embodiment, the inorganic additive is selected from at least one of titanium dioxide, silicon dioxide, zinc oxide, aluminum oxide, or zirconium oxide.

[0013] In one embodiment, the inorganic additive is alumina, the particle size of the alumina is 1-5 μm, the model is CY-L15, and it is sourced from Hangzhou Jiupeng New Materials Co., Ltd.

[0014] In one embodiment, the aqueous silica sol is of the brand YC-SL15S-2.

[0015] The present invention introduces aqueous silica sol and inorganic additives into a hydroxylated acrylic resin composition, specifically aluminum oxide with a D50 of 1-5 μm and an aqueous silica sol designated YC-SL15S-2, and controls the added amounts to effectively balance the product's hardness and flexibility, as well as its wear resistance and adhesion, thereby optimizing the overall performance of the paint film. Furthermore, during research, the present inventors discovered that the use of a hydroxylated acrylic dispersion designated Huangshan Liangu 0828C exhibits excellent compatibility with the aluminum oxide and aqueous silica sol in the system. This, combined with the additives and other raw materials, ensures the product's hardness and scratch resistance, while preventing slow drying speeds that could affect application.

[0016] In one embodiment, the trade name of the titanium dioxide slurry is 01W-200 water-based white slurry paint, which is sourced from Chengdu Clivia Paint Co., Ltd.

[0017] In one embodiment, the leveling agent is SN-4763, which is sourced from Shanghai Shenzhu Chemical Technology Co., Ltd.

[0018] In one embodiment, the wetting and dispersing agent includes at least Shenzhu SN-4741, TEGO-4100 and BYK192.

[0019] In one embodiment, the mass ratio of Shenzhu SN-4741, TEGO-4100 and BYK192 is (1-2): (0.2-0.4) (0.5-1).

[0020] In one embodiment, the mass ratio of Shenzhu SN-4741 to BYK192 is 1:0.3:0.5.

[0021] In one embodiment, the film-forming aid includes at least dipropylene glycol methyl ether and dipropylene glycol butyl ether.

[0022] In one embodiment, the mass ratio of dipropylene glycol methyl ether to dipropylene glycol butyl ether is 3:(1-4).

[0023] In one embodiment, the mass ratio of dipropylene glycol methyl ether to dipropylene glycol butyl ether is 3:2.5.

[0024] In one embodiment, the defoaming agent includes at least Evonik 902W, Deqian 8590 and Evonik 810.

[0025] In one embodiment, the mass ratio of Evonik 902W, Deqian 8590 and Evonik 810 is (1-4):1:(1-4).

[0026] In one embodiment, the mass ratio of Evonik 902W, Deqian 8590 and Evonik 810 is 1.5:1:1.5.

[0027] In one embodiment, the preservative comprises at least 1,2-benzisothiazolin-3-one.

[0028] In one embodiment, the amine neutralizing agent is 2-amino-2-methyl-1-propanol.

[0029] In one embodiment, the thickener is Acare PUR44.

[0030] In one embodiment, the wax powder is of the brand Hanwei 2594.

[0031] In one embodiment, the matting powder includes at least Grace SY7000 and Huber M6.

[0032] In one embodiment, the mass ratio of Grace SY7000 to Huber M6 is (1.5-4):1.

[0033] In one embodiment, the mass ratio of Grace SY7000 to Huber M6 is 3:1.

[0034] In one embodiment, the brand of the hand wax is Jingzhijie W-801A.

[0035] In one embodiment, the mass ratio of the hydroxy acrylic resin composition to the curing agent composition is 100:(10-20).

[0036] In one embodiment, the mass ratio of the hydroxy acrylic resin composition to the curing agent composition is 100:15.

[0037] In one embodiment, the curing agent composition comprises, by mass percentage, 60-80% of isocyanate curing agent, 0.2-0.6% of dehydrating agent, and the balance of propylene glycol methyl ether acetate.

[0038] In one embodiment, the dehydrating agent is G180.

[0039] In one embodiment, the brand of the isocyanate curing agent is selected from at least one of Covestro 2487-1, Wanhua AQUOI IN168, Covestro BAYHYDUR 305CN, and Covestro 307-1.

[0040] In one embodiment, the isocyanate curing agent is Wanhua AQUOI IN168.

[0041] Furthermore, the present invention adopts the isocyanate curing agent with the brand name Wanhua AQUOIIN168, so that the provided product has a longer activation period on the basis of ensuring the comprehensive performance of the product, and still has fluidity after being sealed overnight (can be recycled overnight), meeting the requirements of mechanical spraying.

[0042] On the other hand, the present invention provides a method for preparing a high-hardness, wear-resistant and quick-drying water-based topcoat, which comprises at least the following steps: stirring and mixing the raw materials of a hydroxyl acrylic resin composition to obtain a hydroxyl acrylic resin composition, stirring and mixing the raw materials of a curing agent composition to obtain a curing agent composition, and stirring and mixing the hydroxyl acrylic resin composition and the curing agent composition when in use.

[0043] In one embodiment, the preparation method of the high-hardness, wear-resistant and quick-drying water-based topcoat comprises the following steps: adding a hydroxy acrylic acid dispersion into a dispersion container, sequentially adding a wetting dispersant, an amine neutralizer, a defoaming agent, and a leveling agent under a stirring state at a speed of 600-1000 r / min, stirring for 20-40 minutes at a speed of 1100-1500 r / min, sequentially adding a matting powder, a wax powder, and an inorganic additive under a stirring state at a speed of 600-1000 r / min, and stirring at a speed of 1100-1500 r / min. r / min for 20-40 minutes, add hand wax, titanium dioxide slurry, film-forming aid, water and thickener in sequence, and finally add preservative, stir at a speed of 600-1000 r / min for 20-30 minutes, and then stir at a speed of 300-500 r / min for 10-20 minutes to obtain a hydroxy acrylic resin composition; stir and mix propylene glycol methyl ether acetate, a dehydrating agent and an isocyanate curing agent to obtain a curing agent composition; stir and mix the hydroxy acrylic resin composition and the curing agent composition when using.

[0044] The preparation method of the high-hardness, wear-resistant and quick-drying water-based topcoat provided by the present invention is simple and easy to use, and overcomes the problem that the existing water-based paint is easily scratched and transparent due to friction during use, affecting the decorative effect and service life, and is easy to achieve large-scale industrial production and popularization and application.

[0045] Beneficial effects

[0046] 1. The present invention provides a water-based topcoat with high hardness, wear resistance and quick drying. The product is green and environmentally friendly, has high hardness and good wear resistance, and at the same time, has a fast drying speed and a long activation period, which can well meet the construction and application requirements of wood coating topcoat.

[0047] 2. The present invention introduces aqueous silica sol and inorganic additives into the hydroxy acrylic resin composition, especially introduces aluminum oxide with a D50 of 1-5 μm and aqueous silica sol with the brand YC-SL15S-2 and controls the addition amount to effectively balance the hardness and flexibility of the product as well as the wear resistance and adhesion, thereby optimizing the overall performance of the paint film.

[0048] 3. During the research process, the present invention found that by using the hydroxy acrylic dispersion with the brand name Huangshan Liangu 0828C, it has good compatibility with the alumina and aqueous silica sol in the system. With the cooperation of additives and other raw materials, the hardness and scratch resistance of the product are guaranteed, and the slow drying speed that affects the construction is avoided.

[0049] 4. The present invention adopts the isocyanate curing agent with the brand name Wanhua AQUOIIN168, which ensures the comprehensive performance of the product and provides a product with a longer activation period, fluidity after being sealed overnight (and can be used after being recovered overnight), meeting the requirements of mechanical spraying.

[0050] 5. The preparation method of the high-hardness, wear-resistant and quick-drying water-based topcoat provided by the present invention is simple and easy to use. It overcomes the problem that the existing water-based paint is easily scratched and transparent due to friction during use, affecting the decorative effect and service life, and is easy to achieve large-scale industrial production and promotion and application. DETAILED DESCRIPTION

[0051] Example 1

[0052] Example 1 of the present invention provides, on the one hand, a high-hardness, wear-resistant, and quick-drying water-based topcoat, which is composed of a hydroxylated acrylic resin composition and a curing agent composition in a mass ratio of 100:15. The formulas of the hydroxylated acrylic resin composition and the curing agent composition are shown in Table 1.

[0053] Table 1

[0054]

[0055]

[0056] On the other hand, Example 1 of the present invention provides a method for preparing a high-hardness, wear-resistant, and quick-drying water-based topcoat, comprising the following steps: adding a hydroxy acrylic dispersion to a dispersion container, sequentially adding a wetting dispersant, an amine neutralizer, a defoaming agent, and a leveling agent under a stirring speed of 800 r / min, stirring for 30 minutes at a speed of 1200 r / min, sequentially adding a matting powder, wax powder, and an inorganic additive under a stirring speed of 800 r / min, stirring for 30 minutes at a speed of 1200 r / min, sequentially adding a hand wax, titanium dioxide slurry, a film-forming aid, water, and a thickener, and finally adding a preservative, stirring for 20 minutes at a speed of 800 r / min, and then stirring for 10 minutes at a speed of 400 r / min to obtain a hydroxy acrylic resin composition; stirring and mixing propylene glycol methyl ether acetate, a dehydrating agent, and an isocyanate curing agent to obtain a curing agent composition; and stirring and mixing the hydroxy acrylic resin composition and the curing agent composition when used.

[0057] Comparative Example 1

[0058] Comparative Example 1 of the present invention provides a waterborne polyurethane wood coating and a preparation method thereof, which is composed of a hydroxyl acrylic resin composition and a curing agent composition in a mass ratio of 100:10. The formulas of the hydroxyl acrylic resin composition and the curing agent composition are shown in Table 2.

[0059] Table 2

[0060]

[0061]

[0062] The preparation method of the waterborne polyurethane wood coating comprises the following steps:

[0063] (1) Place raw material 1 into a container, add raw materials 2-9 (pre-mixed raw materials 7-9) in sequence under 800 r / min dispersion, increase the speed to 1000 r / min and disperse for 30 minutes, and proceed to step (2) after detecting that there is no oil pit;

[0064] (2) Add 10-12 of the raw materials in sequence under a dispersion speed of 1000 r / min, increase the speed to 1500 r / min and disperse for 20 min. After the fineness is detected to be less than 30 μm, proceed to step (3);

[0065] (3) Add raw materials 13-20 (pre-mixed raw materials 18-20) in sequence at 1000 r / min and disperse for 15 minutes, then add raw material 21, and adjust the viscosity to the standard range to obtain component A; stir and mix raw materials 22-24 to obtain component B; stir and mix components A and B when using.

[0066] Comparative Example 2

[0067] Comparative Example 2 of the present invention provides a high-hardness, wear-resistant, quick-drying water-based topcoat and a preparation method thereof. The specific implementation method is the same as that of Comparative Example 1, except that the AQUALATE 8517 is replaced by Huangshan Liangu 0828C.

[0068] Comparative Example 3

[0069] Comparative Example 3 of the present invention provides a high-hardness, wear-resistant, quick-drying water-based topcoat and a preparation method thereof. The specific implementation method is the same as that of Comparative Example 1, except that the AQUALATE 8517 is replaced by Shanghai Qidai QR-999.

[0070] Comparative Example 4

[0071] Comparative Example 4 of the present invention provides a high-hardness, wear-resistant, quick-drying water-based topcoat and a preparation method thereof. The specific implementation method is the same as that of Comparative Example 1, except that the AQUALATE 8517 is replaced by AC 8892.

[0072] Comparative Example 5

[0073] Comparative Example 5 of the present invention provides a high-hardness, wear-resistant, and quick-drying water-based topcoat and a preparation method thereof. The specific implementation method is the same as that of Comparative Example 1, except that Wanhua AQUOIIN 168 is replaced by Covestro 2487-1.

[0074] Comparative Example 6

[0075] Comparative Example 6 of the present invention provides a high-hardness, wear-resistant, and quick-drying water-based topcoat and a preparation method thereof. The specific implementation method is the same as that of Comparative Example 1, except that Wanhua AQUOIIN 168 is replaced by Covestro Bayhydur 305CN.

[0076] Comparative Example 7

[0077] Comparative Example 7 of the present invention provides a high-hardness, wear-resistant, quick-drying water-based topcoat and a preparation method thereof. The specific implementation method is the same as that of Comparative Example 1, except that Wanhua AQUOIIN 168 is replaced by Covestro 307-1.

[0078] Performance Testing

[0079] 1. The products provided in Example 1 and Comparative Example 1 were prepared according to the construction ratio (the mass ratio of the hydroxy acrylic resin composition, the curing agent composition and water was 100:15:10) to prepare samples, and the performance tests in Table 3 were performed. The test results are shown in Table 3.

[0080] Table 3

[0081]

[0082] Analysis of the data in Table 3 shows that the product provided in Example 1 has relatively better hardness, adhesion, flexibility and scratch resistance than the product provided in Comparative Example 1.

[0083] 2. The products provided in Comparative Examples 2-4 were prepared according to the construction ratio (the mass ratio of the hydroxy acrylic resin composition, the curing agent composition and water was 100:15:10) to prepare samples, and the performance tests in Table 4 were performed. The test results are shown in Table 4.

[0084] Table 4

[0085]

[0086] In Table 4, the test method for scratch resistance is: rub the paint film surface with a paper strip and observe whether scratches appear on the paint film surface. The test results are evaluated on a 5-point scale, with 5 points representing the best performance.

[0087] Analysis of the data in Table 4 shows that, in the product system of Comparative Example 1, changing the emulsion composition cannot simultaneously guarantee the hardness, glossiness, scratch resistance and adhesion of the product.

[0088] 2. The products provided in Comparative Example 2 and Comparative Examples 5-7 were prepared according to the construction ratio (the mass ratio of the hydroxy acrylic resin composition, the curing agent composition and water was 100:15:10) to prepare samples, and the performance tests in Table 5 were performed. The test results are shown in Table 5.

[0089] Table 5

[0090]

[0091]

[0092] In Table 4, the scratch resistance test method is: rub the paint film surface with sandpaper and observe whether there are bright marks on the paint film surface. The test results are evaluated on a 5-point scale, with 5 points representing the best performance.

[0093] Analysis of the data in Table 5 shows that the product produced by combining Huangshan Liangu 0828C and Wanhua AQUOIIN 168 has a long activation period and maintains fluidity even after being sealed overnight, thus meeting the recycling requirements of spray equipment.

Claims

1. A high-hardness, wear-resistant, quick-drying water-based topcoat, characterized in that: Comprising a hydroxy acrylic resin composition and a curing agent composition; The raw materials for preparing the hydroxy acrylic resin composition include, by weight, at least: 40-50 parts of hydroxy acrylic dispersion, 30-40 parts of titanium dioxide paste, 5-20 parts of aqueous silica sol, 2-8 parts of inorganic additives, 5-20 parts of auxiliary agents, and 2-10 parts of water. The viscosity of the hydroxy acrylic dispersion at 25° C. is 100-3000 mPa·s. The curing agent composition includes at least an isocyanate curing agent.

2. The high-hardness, wear-resistant, quick-drying water-based topcoat according to claim 1, characterized in that: In parts by weight, the additives include at least: 0.2-0.3 parts of leveling agent, 1-3 parts of wetting and dispersing agent, 4-8 parts of film-forming additive, 0.5-1 parts of defoaming agent, 0.1-0.5 parts of preservative, 0.1-0.5 parts of amine neutralizer, 0.1-0.3 parts of thickener, 0.5-1 parts of wax powder, 1-6 parts of matting powder and 2-5 parts of hand wax.

3. The high-hardness, wear-resistant, quick-drying water-based topcoat according to claim 1, characterized in that: The mass ratio of the hydroxy acrylic acid dispersion, the inorganic additive and the aqueous silica sol is (8-10):1:

1.

4. The high-hardness, wear-resistant, quick-drying water-based topcoat according to claim 1, characterized in that: The brand of the hydroxylated acrylic dispersion is Huangshan Liangu 0828C.

5. The high-hardness, wear-resistant, quick-drying water-based topcoat according to claim 1, characterized in that: The inorganic additive is selected from at least one of nano titanium dioxide, nano silicon dioxide, nano zinc oxide, aluminum oxide or nano zirconium oxide.

6. The high-hardness, wear-resistant, quick-drying water-based topcoat according to claim 2, characterized in that: The wetting and dispersing agent at least includes Shenzhu SN-4741, TEGO-4100 and BYK192.

7. The high-hardness, wear-resistant, quick-drying water-based topcoat according to claim 2, characterized in that: The film-forming aid at least includes dipropylene glycol methyl ether and dipropylene glycol butyl ether.

8. The high-hardness, wear-resistant, quick-drying water-based topcoat according to claim 1, characterized in that: Calculated by mass percentage, the curing agent composition comprises 60-80% of isocyanate curing agent, 0.2-0.6% of dehydrating agent, and the balance is made up of propylene glycol methyl ether acetate.

9. The high-hardness, wear-resistant, quick-drying water-based topcoat according to claim 4, characterized in that: The brand of the isocyanate curing agent is Wanhua AQUOIIN168.

10. A method for preparing a high-hardness, wear-resistant, quick-drying water-based topcoat according to any one of claims 1 to 9, characterized in that: The raw materials of the hydroxy acrylic resin composition are stirred and mixed to obtain a hydroxy acrylic resin composition, and the raw materials of the curing agent composition are stirred and mixed to obtain a curing agent composition. When used, the hydroxy acrylic resin composition and the curing agent composition are stirred and mixed.

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