Water-based nano wear-resistant paint and preparation method thereof

Abstract

The invention provides water-based nano wear-resistant paint and a preparation method thereof, and relates to the technical field of wear-resistant paint preparation. The paint is composed of water-borne epoxy resin, organic silicon modified water-borne polyester resin, polytetrafluoroethylene wax dispersion liquid, auxiliaries, a solvent and wear-resistant filler. The defects in the prior art are overcome, the wear-resistant and water-resistant effects of the material can be improved while the toughness of a paint coating can be effectively guaranteed, and the application value of the water-based paint is comprehensively improved.

Description

Technical Field

[0001] This invention relates to the field of wear-resistant paint preparation technology, specifically to a water-based nano wear-resistant paint and its preparation method. Background Technology

[0002] Water-based paints use water as a solvent or dispersion medium and have advantages such as being non-toxic, odorless, and non-flammable, which is conducive to the rational use of resources and environmental protection. However, their chemical resistance, abrasion resistance, and scratch resistance are generally not as good as those of organic solvent-based paints, which limits their large-scale application to some extent. For example, in scenarios where solid wood floors and furniture surfaces need to withstand long-term friction, ordinary water-based paint coatings are prone to wear and scratches, affecting their service life and aesthetics.

[0003] Therefore, in order to improve the relevant performance of water-based paints, it is necessary to design a water-based abrasion-resistant paint that can improve abrasion resistance. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a water-based nano-abrasion-resistant paint and its preparation method, which can effectively ensure the toughness of the paint coating while improving the wear resistance and water resistance of the material, thus comprehensively enhancing the application value of water-based paints.

[0005] To achieve the above objectives, the present invention comprehensively enhances the application value of water-based paints through the following technical solutions: A water-based nano-abrasion-resistant paint, wherein the paint is prepared by mixing a main agent and a curing agent in a mass ratio of 8:1; The main agent is composed of the following raw materials in parts by weight: 38-45 parts of waterborne epoxy resin, 4-6 parts of organosilicon-modified waterborne polyester resin, 8-12 parts of polytetrafluoroethylene wax dispersion, 1-3 parts of additives, 21-23 parts of solvent, and 10-12 parts of wear-resistant filler. The organosilicon-modified waterborne polyester resin is obtained by modifying waterborne polyester resin with methyltrimethoxysilane as a modifier.

[0006] Preferably, the curing agent is a solvent-based isocyanate curing agent.

[0007] Preferably, the wear-resistant filler is nano-alumina with a particle size of 8-12 nm.

[0008] Preferably, the additive is a mixture of defoamer and leveling agent in a 1:1 mass ratio, wherein the defoamer is an organosilicon-modified polyether defoamer and the leveling agent is an acrylate leveling agent.

[0009] Preferably, the solvent is a mixture of water and dodecyl alcohol ester in a weight ratio of (2-6.7):1.

[0010] Preferably, the specific preparation method of the organosilicon-modified waterborne polyester resin includes the following steps: (1) Prepare the raw materials according to the following parts by weight: 21-27 parts neopentyl glycol, 9-13 parts trimethylolpropane, 15-29 parts isophthalic acid, 10-20 parts adipic acid, 4-8 parts trimellitic anhydride, 15-19 parts ethylene glycol monobutyl ether, 0.1 parts dibutyltin dilaurate, 4.7 parts N,N-dimethylethanolamine, and 8-10 parts methyltrimethoxysilane; (2) In a N2 environment, neopentyl glycol, isophthalic acid, adipic acid, trimethylolpropane and the catalyst dibutyltin dilaurate were added to a four-necked flask to obtain a preform. (3) The pre-formed material is continuously charged with N2 and trimellitic anhydride is added to react and the reaction material is obtained; (4) Adjust the temperature of the above reaction material to 80°C, add 1 / 2 of the methyltrimethoxysilane, stir evenly for 20 min, raise the temperature to 90°C and add the remaining methyltrimethoxysilane and deionized water mixture. The mixture is added dropwise at a rate of 4-5 drops per second, and the reaction is kept at the temperature for 2 h to obtain the mixture. (5) Add ethylene glycol monobutyl ether to the mixture, adjust the solid content of the system to 85%, cool down to below 60°C, add N,N-dimethylethanolamine to neutralize the reaction for 0.5h, adjust the pH value of the system to between 7 and 8, add deionized water to adjust the solid content to 40%, stir for 15min, and obtain organosilicon modified waterborne polyester resin.

[0011] Preferably, the preparation method of the polytetrafluoroethylene wax dispersion includes the following steps: S1-1. Weigh 1% of polyurethane thickener and 64% of water and propylene glycol mixture and stir evenly to obtain a solution. Add 35% of polytetrafluoroethylene wax powder to fully wet the solution and let stand for 2 hours to obtain a slurry. S1-2. Place the slurry on a disperser and stir at a speed of 900-1100 r / min for 10 min to obtain a polytetrafluoroethylene wax dispersion.

[0012] Preferably, the mixture in step S1-1 is obtained by mixing water and propylene glycol at a mass ratio of 8:1.

[0013] A method for preparing a water-based nano-abrasion-resistant paint includes the following steps: (1) Weigh the raw materials according to the formula, add waterborne epoxy resin, silicone-modified waterborne polyester resin to the additives and 1 / 2 of the solvent, and stir on a disperser at a speed of 900-1100 r / min for 10 min to obtain a dispersion. (2) Add wear-resistant filler to the dispersion and stir again until the mixture is homogeneous to obtain the pre-mixed slurry; (3) Add 1.2 times the amount of 3mm ground zircon beads to the pre-made slurry, grind in a vibrating disperser for 25 minutes, remove and filter to obtain the filtered slurry, rinse the zircon beads with the remaining 1 / 2 of the solvent to obtain the rinsing liquid, add the rinsing liquid to the filtered slurry to obtain the mixed slurry; (4) Add polytetrafluoroethylene wax dispersion to the mixed slurry and disperse it on a stirring disperser at a speed of 800-1000 r / min for 30 min until uniform, and the main agent is obtained; (5) When using, mix the main agent and the curing agent evenly to obtain the paint.

[0014] This invention provides a water-based nano-abrasion-resistant paint and its preparation method, which has the following advantages compared with the prior art: This invention uses waterborne epoxy resin, silicone-modified waterborne polyester resin, and polytetrafluoroethylene wax dispersion as the base materials of the paint agent. The addition of silicone-modified waterborne polyester resin can improve the wear resistance and water resistance of the final paint while ensuring the adhesion of the paint. Furthermore, the combination of silicone-modified waterborne polyester resin and polytetrafluoroethylene wax dispersion can enhance the scratch resistance of the material, thus comprehensively improving the application value of waterborne paint. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] The epoxy resin used below is DER917 from the Olin brand; the polytetrafluoroethylene wax powder is KTL-4N from the Kitamura brand; the curing agent is Desmodur N3300 from the Covestro brand; the additives are a 1:1 mixture of defoamer and leveling agent, with the defoamer being DT-698, a silicone-modified polyether defoamer; the leveling agent is BZ603, an acrylic leveling agent from the Jiaming brand; the polyurethane thickener is C-113 from the Zhonglianbang brand; the waterborne polyester resin in Comparative Example 1 is HOS-1005 from the Han'aos brand; and the wear-resistant filler is 10nm nano-alumina.

[0017] Preparation of raw materials: 1. Preparation of silicone-modified waterborne polyester resin: 1.1 Preparation of organosilicon-modified waterborne polyester resin A; Specific preparation method of organosilicon-modified waterborne polyester resin: (1) Prepare the raw materials according to the following parts by weight: 24 parts neopentyl glycol, 22 parts isophthalic acid, 15 parts adipic acid, 11 parts trimethylolpropane, 0.1 parts dibutyltin dilaurate, 6 parts trimellitic anhydride, 17 parts ethylene glycol monobutyl ether, 0.1 parts dibutyltin dilaurate, 4.7 parts N,N-dimethylethanolamine, and 9 parts methyltrimethoxysilane; (2) In a N2 environment, neopentyl glycol, isophthalic acid, adipic acid, and trimethylolpropane were added to a four-necked flask, along with the catalyst dibutyltin dilaurate. The mixture was heated in an oil bath to 140°C. Once the material was dissolved to a fluid state, it was slowly stirred with a stirrer. Cooling water was introduced, and the mixture was kept warm until it was completely melted. The temperature was then raised to 150°C and kept warm for 1 hour. The temperature was increased by 20°C every 2 hours until the system temperature reached 210°C. The reaction was carried out for 2.5 hours until the acid value of the system reached below 10 mg KOH / g, thus obtaining the pre-prepared material. (3) The pre-made material is continuously charged with N2 and cooled to 160°C. Trimeric trioxide is added and the temperature is raised to 180°C for 40 min. The acid value is controlled at 45-55 mg KOH / g to obtain the reaction material. (4) Cool the above reactants to 80°C, add 1 / 2 of the methyltrimethoxysilane, stir evenly for 20 min, heat to 90°C, add the remaining methyltrimethoxysilane and deionized water mixture, add the mixture at a rate of 4-5 drops / s, keep the temperature and react for 2 h to obtain the mixture. The mass ratio of methyltrimethoxysilane to reactants is 1:9, and the mass ratio of deionized water to reactants is 1.5:9. (5) Add ethylene glycol monobutyl ether to the mixture, adjust the solid content of the system to 85%, cool down to below 60°C, add N,N-dimethylethanolamine to neutralize the reaction for 0.5h, adjust the pH value of the system to between 7 and 8, add deionized water to adjust the solid content to 40%, stir for 15min, and obtain organosilicon modified waterborne polyester resin.

[0018] 1.2 Preparation of Organosilicon-Modified Waterborne Polyester Resin B: The preparation of organosilicon-modified waterborne polyester resin B is the same as that of organosilicon-modified waterborne polyester resin A, except that step (4) is different from that of organosilicon-modified waterborne polyester resin A.

[0019] (4) Cool the above reaction material to 80°C, add methyltrimethoxysilane, stir evenly for 20 min, heat to 90°C, add deionized water at a rate of 4-5 drops per second, keep the temperature for 2 h to obtain a mixture. The mass ratio of methyltrimethoxysilane to the reaction material is 1:9, and the mass ratio of deionized water to the reaction material is 1.5:9.

[0020] 1.3 Preparation of Organosilicon-Modified Waterborne Polyester Resin C: The preparation of organosilicon-modified waterborne polyester resin C is the same as that of organosilicon-modified waterborne polyester resin A, except that step (4) is different from that of organosilicon-modified waterborne polyester resin A.

[0021] (4) Cool the above reaction material to 80°C, add the mixture of methyltrimethoxysilane and deionized water at a rate of 4-5 drops per second, stir for 20 min, raise the temperature to 90°C, keep the temperature for 2 h to obtain the mixture, the mass ratio of methyltrimethoxysilane to reaction material is 1:9, and the mass ratio of deionized water to reaction material is 1.5:9.

[0022] 1.4 Obtaining Organosilicon-Modified Waterborne Polyester Resin D: Baiyi brand SP-3501 water-based organosilicon modified polyester resin; 2. Preparation of polytetrafluoroethylene wax dispersion S1-1. Weigh 1% of polyurethane thickener and 64% of a mixture of water and propylene glycol (the mixture is obtained by mixing water and propylene glycol at a mass ratio of 8:1). Stir evenly to obtain a solution. Add 35% of polytetrafluoroethylene wax powder to fully wet the solution and let it stand for 2 hours to obtain a slurry. S1-2. Place the slurry on a disperser and stir at 1000 r / min for 10 min to obtain a polytetrafluoroethylene wax dispersion.

[0023] Example 1: Preparation of water-based nano-abrasion-resistant paint: (1) Prepare the raw materials according to the following weight proportions: 45 parts of waterborne epoxy resin, 6 parts of organosilicon-modified waterborne polyester resin A, 12 parts of polytetrafluoroethylene wax dispersion, 3 parts of additives, 23 parts of solvent, and 12 parts of wear-resistant filler. (2) Add additives and 1 / 2 volume of solvent to waterborne epoxy resin and silicone-modified waterborne polyester resin A, and stir at 1000 r / min for 10 min on a disperser to obtain a dispersion. (3) Add wear-resistant filler to the dispersion and stir again until the mixture is homogeneous to obtain the pre-mixed slurry; (4) Add 1.2 times the amount of 3mm ground zircon beads to the pre-made slurry, grind in a vibrating disperser for 25 minutes, remove and filter to obtain the filtered slurry, rinse the zircon beads with the remaining 1 / 2 of the solvent to obtain the rinsing liquid, add the rinsing liquid to the filtered slurry to obtain the mixed slurry; (5) Add polytetrafluoroethylene wax dispersion to the mixed slurry and disperse it on a stirring disperser at a speed of 900 r / min for 30 min until uniform, and the main agent is obtained; (6) Before coating, stir the main agent and the curing agent evenly and mix them evenly at a mass ratio of 8:1 to obtain water-based nano wear-resistant paint.

[0024] Example 2: This embodiment refers to the method of Example 1 for preparing water-based nano-abrasion-resistant paint, wherein the organosilicon-modified water-based polyester resin is selected as organosilicon-modified water-based polyester resin A, and only the ratio of each raw material is different. All other steps are the same as in Example 1. The specific raw material ratio is as follows: 38 parts of waterborne epoxy resin, 4 parts of silicone-modified waterborne polyester resin A, 8 parts of polytetrafluoroethylene wax dispersion, 1 part of additive, 21 parts of solvent, and 10 parts of wear-resistant filler.

[0025] Comparative Example 1: This comparative example prepared water-based nano-abrasion-resistant paint according to the method of Example 1, except that the organosilicon-modified water-based polyester resin A was replaced with water-based polyester resin, and all other steps were the same as in Example 1.

[0026] Comparative Example 2: This comparative example prepares water-based nano-abrasion-resistant paint according to the method of Example 1, except that steps (2), (4), and (5) are different. All other steps are the same as in Example 1. The specific steps are as follows: (2) Add additives and solvents to waterborne epoxy resin and silicone-modified waterborne polyester resin, and stir at 1000 r / min for 10 min on a disperser to obtain a dispersion. (4) Add 1.2 times the amount of 3mm ground zirconium beads to the pre-made slurry, grind it in a vibrating disperser for 25 minutes, and then filter it to obtain the filtered slurry; (5) Add polytetrafluoroethylene wax dispersion to the filtered slurry and disperse it on a stirring disperser at a speed of 900 r / min for 30 min until uniform, and the main agent is obtained; Comparative Example 3: This comparative example prepared a water-based nano-abrasion-resistant paint according to the method of Example 1, wherein the organosilicon-modified water-based polyester resin A was replaced with organosilicon-modified water-based polyester resin B, and the other steps were the same as in Example 1.

[0027] Comparative Example 4: This comparative example prepared a water-based nano-abrasion-resistant paint according to the method of Example 1, wherein the organosilicon-modified water-based polyester resin A was replaced with organosilicon-modified water-based polyester resin C, and the other steps were the same as in Example 1.

[0028] Comparative Example 5: This comparative example prepared a water-based nano-abrasion-resistant paint according to the method of Example 1, wherein the organosilicon-modified water-based polyester resin A was replaced with organosilicon-modified water-based polyester resin D, and the other steps were the same as in Example 1.

[0029] Detection: 1. The substrate of the test panel is an anodized aluminum plate. The surface of the test panel is coated with HAY-H06-Y010 chromium-free high solids epoxy primer with a dry film thickness of 20nm. After the primer is cured for 24 hours, two coats of water-based wear-resistant paint are applied.

[0030] 2. Test the hardness and abrasion resistance of the paint coating: Hardness testing: The pencil hardness of the coating was determined in accordance with GB / T 6739-2006.

[0031] Abrasion resistance test: The abrasion resistance of the coating was determined using a grinding machine in accordance with ASTM D4060-2019.

[0032] The specific results are shown in Table 1. Table 1 As can be seen from the table above, the coating formed by the paint in Example 1 has higher wear resistance.

[0033] 3. Test the scratch resistance and water resistance of each coating group; Scratch resistance test: The scratch resistance of the coating is determined using a scratch resistance tester in accordance with ASTM D2197-2016.

[0034] Water resistance test: According to GB / T5209-1985, the paint film is immersed at (40±1)℃ and observed for whitening and bubbling.

[0035] The specific results are shown in Table 2. Table 2 As shown in the table above, the coating formed by the paint in Example 1 showed the best overall performance in the tests of scratch resistance and water resistance.

[0036] 4. Flexibility test: The flexibility of the coating is tested using a flexibility tester in accordance with GB / T1731-1993. The specific results are shown in Table 3. Table 3 As can be seen from the table above, the paint in Example 1 has higher flexibility.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water-based nano-abrasion-resistant paint, characterized in that: The paint is prepared by mixing the main agent and the curing agent in a mass ratio of 8:

1. The main agent is composed of the following raw materials in parts by weight: 38-45 parts of waterborne epoxy resin, 4-6 parts of organosilicon-modified waterborne polyester resin, 8-12 parts of polytetrafluoroethylene wax dispersion, 1-3 parts of additives, 21-23 parts of solvent, and 10-12 parts of wear-resistant filler. The organosilicon-modified waterborne polyester resin is obtained by modifying waterborne polyester resin with methyltrimethoxysilane as a modifier.

2. The paint according to claim 1, characterized in that: The curing agent is a solvent-based isocyanate curing agent.

3. The paint according to claim 1, characterized in that: The wear-resistant filler is nano-alumina with a particle size of 8-12 nm.

4. The paint according to claim 1, characterized in that: The additive is a mixture of defoamer and leveling agent in a 1:1 mass ratio. The defoamer is a silicone-modified polyether defoamer, and the leveling agent is an acrylate leveling agent.

5. The paint according to claim 1, characterized in that: The solvent is obtained by mixing water and dodecyl alcohol ester in a weight ratio of (2-6.7):

1.

6. The paint according to claim 1, characterized in that: The specific preparation method of the organosilicon-modified waterborne polyester resin includes the following steps: (1) Prepare the raw materials according to the following parts by weight: 21-27 parts neopentyl glycol, 9-13 parts trimethylolpropane, 15-29 parts isophthalic acid, 10-20 parts adipic acid, 4-8 parts trimellitic anhydride, 15-19 parts ethylene glycol monobutyl ether, 0.1 parts dibutyltin dilaurate, 4.7 parts N,N-dimethylethanolamine, and 8-10 parts methyltrimethoxysilane; (2) In a N2 environment, neopentyl glycol, isophthalic acid, adipic acid, trimethylolpropane and the catalyst dibutyltin dilaurate were added to a four-necked flask to obtain a preform. (3) The pre-formed material is continuously charged with N2 and trimellitic anhydride is added to react and the reaction material is obtained; (4) Adjust the temperature of the above reaction material to 80°C, add 1 / 2 of the methyltrimethoxysilane, stir evenly for 20 min, raise the temperature to 90°C and add the remaining methyltrimethoxysilane and deionized water mixture. The mixture is added dropwise at a rate of 4-5 drops per second, and the reaction is kept at the temperature for 2 h to obtain the mixture. (5) Add ethylene glycol monobutyl ether to the mixture, adjust the solid content of the system to 85%, cool down to below 60°C, add N,N-dimethylethanolamine to neutralize the reaction for 0.5h, adjust the pH value of the system to between 7 and 8, add deionized water to adjust the solid content to 40%, stir for 15min, and obtain organosilicon modified waterborne polyester resin.

7. The paint according to claim 1, characterized in that: The preparation method of the polytetrafluoroethylene wax dispersion includes the following steps: S1-1. Weigh 1% of polyurethane thickener and 64% of water and propylene glycol mixture and stir evenly to obtain a solution. Add 35% of polytetrafluoroethylene wax powder to fully wet the solution and let stand for 2 hours to obtain a slurry. S1-2. Place the slurry on a disperser and stir at a speed of 900-1100 r / min for 10 min to obtain a polytetrafluoroethylene wax dispersion.

8. The paint according to claim 7, characterized in that: The mixture in step S1-1 is obtained by mixing water and propylene glycol at a mass ratio of 8:

1.

9. A method for preparing a paint as described in any one of claims 1-8, characterized in that: The preparation method includes the following steps: (1) Weigh the raw materials according to the formula, add waterborne epoxy resin, silicone-modified waterborne polyester resin to the additives and 1 / 2 of the solvent, and stir on a disperser at a speed of 900-1100 r / min for 10 min to obtain a dispersion. (2) Add wear-resistant filler to the dispersion and stir again until the mixture is homogeneous to obtain the pre-mixed slurry; (3) Add 1.2 times the amount of 3mm ground zircon beads to the pre-made slurry, grind in a vibrating disperser for 25 minutes, remove and filter to obtain the filtered slurry, rinse the zircon beads with the remaining 1 / 2 of the solvent to obtain the rinsing liquid, add the rinsing liquid to the filtered slurry to obtain the mixed slurry; (4) Add polytetrafluoroethylene wax dispersion to the mixed slurry and disperse it on a stirring disperser at a speed of 800-1000 r / min for 30 min until uniform, and the main agent is obtained; (5) When using, mix the main agent and the curing agent evenly to obtain the paint.

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