Bacteriostatic water-based paint for furniture

Abstract

The invention relates to a bacteriostatic water-based paint for furniture, and belongs to the technical field of water-based paints. Silicon dioxide is creatively used as a bridging substance and then reacts with hydroxy acrylic resin and dimethyl octadecyl [3-(trimethoxysilyl) propyl] ammonium chloride in sequence, so that a modified filler is prepared, the modified filler is mixed with other components to form the water-based paint, on one hand, the water-based paint can have more excellent antibacterial performance, and on the other hand, the water-based paint can be used for preparing the water-based paint. The water-based paint is endowed with excellent antibacterial durability in a hydroxyl acrylic resin indirect quaternization form, migration and falling of a bacteriostatic agent are not prone to occurring in practical application, on the other hand, due to introduction of silicon dioxide, the water-based paint has certain wear resistance, and the water-based paint is more durable after reacting with the hydroxyl acrylic resin to form a bond, so that the service life of the water-based paint is prolonged. And the nano-particles can be better dispersed in a system, so that the wear resistance and the antibacterial activity of the nano-particles are well promoted.

Description

Technical Field

[0001] The invention belongs to the technical field of water-based coatings, and in particular relates to an antibacterial water-based coating for furniture. Background Art

[0002] Furniture refers to a large category of tools and facilities that are essential for humans to maintain normal life, engage in production practices and carry out social activities. Due to its advantages such as easy processing and beautiful appearance, most of the furniture is currently made of wood.

[0003] However, because wood materials are often susceptible to invasion by microorganisms such as bacteria and fungi, leading to mildew and damage, which greatly affects the practicality of furniture, people often apply water-based paints with antibacterial properties to the surface of wooden furniture when making them. However, the existing water-based paints with antibacterial properties still have many drawbacks that limit their actual antibacterial effect. On the one hand, they are not durable enough. Most water-based paints simply add antibacterial agents in the form of physical blends, which easily cause antibacterial agent migration and shedding over time. On the other hand, they do not take into account that furniture is a frequently used facility in human daily life and has a lot of friction on its surface. If the wear resistance is poor during actual use, it is very easy to directly damage the coating, which seriously affects the antibacterial performance.

[0004] Therefore, the antibacterial water-based coatings currently used for furniture still have many defects and are in urgent need of improvement. Summary of the Invention

[0005] In response to the problems existing in the prior art, the purpose of the present invention is to provide an antibacterial water-based paint for furniture. The present invention creatively utilizes silica as a bridging substance, which is then reacted with a hydroxy acrylic resin and dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride in sequence to prepare a modified filler. The water-based paint formed by mixing the modified filler with other components can, on the one hand, have more excellent antibacterial properties. In the form of indirect quaternization of the hydroxy acrylic resin, the water-based paint is endowed with excellent antibacterial durability, and migration and shedding of the antibacterial agent are not likely to occur in actual application. On the other hand, the introduction of silica not only gives the water-based paint a certain wear resistance, but also, after reacting with the hydroxy acrylic resin to form a bond, it can be better dispersed in the system, thereby playing a good role in promoting its wear resistance and antibacterial properties.

[0006] The purpose of the present invention can be achieved through the following technical solutions: The invention discloses an antibacterial water-based paint for furniture. The antibacterial water-based paint is prepared from 100-110 parts by weight of an aqueous acrylic resin emulsion, 30-35 parts by weight of a modified filler, 20-30 parts by weight of deionized water, 1-3 parts by weight of a film-forming aid, 0.5-1 parts by weight of a defoaming agent, and 1-1.5 parts by weight of a thickener.

[0007] As a preferred technical solution of the present invention, the water-based acrylic resin emulsion is directly purchased from the market.

[0008] As a preferred technical solution of the present invention, the modified filler is prepared by the following steps: Step a: stirring 45-55 parts by weight of methyl methacrylate, 40-50 parts by weight of butyl acrylate, 10-20 parts by weight of acrylic acid and 25-35 parts by weight of hydroxypropyl acrylate for 5-10 minutes to obtain a monomer mixture; Step b: taking 25-35% of the monomer mixture by weight, then adding 30-40 parts by weight of anhydrous ethanol and 1-2 parts by weight of dibenzoyl peroxide, stirring at 70-90° C. for 20-30 minutes to obtain solution a; Step c: adding 50-55 parts by weight of anhydrous ethanol and 2-3 parts by weight of dibenzoyl peroxide to solution a, and then adding dropwise the remaining monomer mixture at 70-90° C. while stirring. After the addition is complete, stirring is continued for 2-3 hours to obtain solution b; Step d: Cooling solution b naturally to 40-50° C., then adding triethylamine to adjust the pH to 7, cooling naturally to room temperature, and finally adding 20-30 parts by weight of deionized water, stirring for 10-15 minutes to obtain a hydroxy acrylic resin; Step e: adding 50-60 parts by weight of activated silica and 4-5 parts by weight of p-toluenesulfonic acid to the hydroxy acrylic resin, stirring at 40-45° C. for 20-24 hours to obtain solution c; Step f: Add dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride to solution c, stir at 30-35°C for 12-16 hours, filter, remove the filtrate, wash with anhydrous ethanol, and finally vacuum dry at 50-60°C until constant weight. The preparation is complete.

[0009] Furthermore, the dripping speed in step c is controlled at 2-3 drops / s.

[0010] Furthermore, the activated silicon dioxide in step e is prepared by the following steps: Step A: Place the silicon dioxide in a plasma cleaning machine and treat it with oxygen plasma for 50-60 seconds, and the preparation is completed.

[0011] Preferably, the specific surface area of the silicon dioxide in step A is 100-150m 2 / g.

[0012] Preferably, the vacuum degree of the oxygen plasma treatment in step A is 6.8-7 Pa, the power is 200 W, and the flow rate of oxygen is 300-400 mL / min.

[0013] Furthermore, the amount of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride used in step f is 15-20 parts by weight.

[0014] As a preferred technical solution of the present invention, the film-forming aid is lauryl alcohol ester.

[0015] As a preferred technical solution of the present invention, the defoaming agent is polyether-modified silicone oil.

[0016] As a preferred technical solution of the present invention, the thickener is a water-based polyurethane thickener.

[0017] A method for preparing an antibacterial water-based paint for furniture, the method comprising the following steps: (1) Deionized water, a film-forming aid, and a defoaming agent were added to the aqueous acrylic resin emulsion, and the mixture was stirred at a speed of 300-500 r / min for 5-10 min to obtain a solution A; (2) Add the modified filler to solution A and stir at a speed of 1000-1200 r / min for 15-20 minutes to mix. Finally, add the thickener and continue stirring at a speed of 200-300 r / min for 5-10 minutes to complete the preparation.

[0018] Beneficial effects of the present invention: (1) The present invention creatively utilizes silica as a bridging substance, and then reacts it with hydroxy acrylic resin and dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride to prepare a modified filler. The water-based coating formed by mixing it with other components can, on the one hand, have better antibacterial properties. In the form of quaternization connected with hydroxy acrylic resin, the water-based coating is endowed with excellent antibacterial durability, and the migration and shedding of the antibacterial agent are not easy to occur in actual application. On the other hand, the introduction of silica not only makes the water-based coating have a certain wear resistance, but also can be better dispersed in the system after reacting with the hydroxy acrylic resin to form a bond, which plays a good role in promoting its wear resistance and antibacterial properties.

[0019] (2) In the preparation process of the modified filler of the present invention, first, a condensation reaction is carried out between the silicon dioxide treated with oxygen plasma and the hydroxy acrylic resin to realize the grafting of the polymer compound. The silicon dioxide treated with oxygen plasma can generate more hydroxyl groups on its surface, which is conducive to better subsequent reactions. Then, dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride is used as an antibacterial active ingredient to further undergo dehydration condensation with the silicon dioxide grafted with the hydroxy acrylic resin to realize quaternization. The water-based coating formed by mixing the modified filler finally prepared with other components has more excellent antibacterial and antimicrobial capabilities and is more suitable for coating on furniture.

[0020] (3) In the preparation process of the modified filler of the present invention, dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride is grafted on the surface of silica to achieve indirect quaternization of the hydroxy acrylic resin. Compared with the direct reaction of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride with the hydroxy acrylic resin, the antibacterial performance of the present invention is better. The surface of the coating formed after coating is actually slightly convex due to the presence of silica. Therefore, grafting the antibacterial agent on the surface of silica can make the antibacterial group tend to the surface of the coating, thereby further exerting the antibacterial and antibacterial capabilities. DETAILED DESCRIPTION

[0021] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0022] The aqueous acrylic resin emulsions in all the embodiments and comparative examples of the present invention were purchased from Wanhua Chemical Group Co., Ltd., model number Lacper® 4501; the aqueous polyurethane thickeners were purchased from Rohm and Haas, model number RM-8W.

[0023] Example 1 The invention discloses an antibacterial water-based paint for furniture. The antibacterial water-based paint is prepared from 100 parts by weight of an aqueous acrylic resin emulsion, 30 parts by weight of a modified filler, 20 parts by weight of deionized water, 1 part by weight of a film-forming aid, 0.5 parts by weight of a defoaming agent, and 1 part by weight of a thickener.

[0024] The water-based acrylic resin emulsion is directly purchased from the market.

[0025] The modified filler is prepared by the following steps: Step a: 45 parts by weight of methyl methacrylate, 40 parts by weight of butyl acrylate, 10 parts by weight of acrylic acid and 25 parts by weight of hydroxypropyl acrylate were stirred for 5 minutes to obtain a monomer mixture; Step b: taking 25% of the monomer mixture by weight, then adding 30 parts by weight of anhydrous ethanol and 1 part by weight of dibenzoyl peroxide, stirring at 70° C. for 20 minutes to obtain solution a; Step c: adding 50 parts by weight of anhydrous ethanol and 2 parts by weight of dibenzoyl peroxide to solution a, and then adding dropwise the remaining monomer mixture at 70° C. while stirring. After the addition is complete, stirring is continued for 2 hours to obtain solution b; Step d: Solution b was cooled naturally to 40° C., triethylamine was added to adjust the pH to 7, and the mixture was cooled naturally to room temperature. Finally, 20 parts by weight of deionized water was added and stirred for 10 minutes to obtain a hydroxy acrylic resin; Step e: adding 50 parts by weight of activated silica and 4 parts by weight of p-toluenesulfonic acid to the hydroxy acrylic resin, stirring at 40° C. for 20 hours to obtain a solution c; Step f: Add dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride to solution c, stir at 30°C for 12 h, filter, remove the filtrate, wash with anhydrous ethanol, and finally vacuum dry at 50°C until constant weight. The preparation is complete.

[0026] The dripping speed of step c is controlled at 2 drops / s.

[0027] The activated silicon dioxide in step e is prepared by the following steps: Step A: Place the silicon dioxide in a plasma cleaning machine and treat it with oxygen plasma for 50 seconds, and the preparation is completed.

[0028] The specific surface area of the silicon dioxide in step A is 100 m 2 / g.

[0029] The vacuum degree of the oxygen plasma treatment in step A is 6.8 Pa, the power is 200 W, and the flow rate of oxygen is 300 mL / min.

[0030] The amount of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride used in step f is 15 parts by weight.

[0031] The film-forming aid is lauryl alcohol ester.

[0032] The defoaming agent is polyether modified silicone oil.

[0033] The thickener is a water-based polyurethane thickener.

[0034] A method for preparing an antibacterial water-based paint for furniture, the method comprising the following steps: (1) Deionized water, a film-forming aid, and a defoaming agent were added to the aqueous acrylic resin emulsion, and the mixture was stirred at a speed of 300 r / min for 5 min to obtain solution A; (2) Add the modified filler to solution A and stir at a speed of 1000 r / min for 15 minutes. Finally, add the thickener and continue stirring at a speed of 200 r / min for 5 minutes. The preparation is complete.

[0035] Example 2 The invention discloses an antibacterial water-based paint for furniture. The antibacterial water-based paint is prepared from 110 parts by weight of an aqueous acrylic resin emulsion, 35 parts by weight of a modified filler, 30 parts by weight of deionized water, 3 parts by weight of a film-forming aid, 1 part by weight of a defoaming agent, and 1.5 parts by weight of a thickener.

[0036] The water-based acrylic resin emulsion is directly purchased from the market.

[0037] The modified filler is prepared by the following steps: Step a: 55 parts by weight of methyl methacrylate, 50 parts by weight of butyl acrylate, 20 parts by weight of acrylic acid and 35 parts by weight of hydroxypropyl acrylate were stirred for 10 minutes to obtain a monomer mixture; Step b: taking 35% of the monomer mixture by weight, then adding 40 parts by weight of anhydrous ethanol and 2 parts by weight of dibenzoyl peroxide, stirring at 90° C. for 30 minutes to obtain solution a; Step c: Add 55 parts by weight of anhydrous ethanol and 3 parts by weight of dibenzoyl peroxide to solution a, then dropwise add the remaining monomer mixture at 90° C. while stirring. After the addition is complete, continue stirring for 3 hours to obtain solution b. Step d: Solution b was cooled naturally to 50° C., triethylamine was added to adjust the pH to 7, and the mixture was cooled naturally to room temperature. Finally, 30 parts by weight of deionized water was added and stirred for 15 minutes to obtain a hydroxy acrylic resin; Step e: adding 60 parts by weight of activated silica and 5 parts by weight of p-toluenesulfonic acid to the hydroxy acrylic resin, stirring at 45° C. for 24 hours to obtain a solution c; Step f: Add dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride to solution c, stir at 35°C for 16 hours, filter, remove the filtrate, wash with anhydrous ethanol, and finally vacuum dry at 60°C until constant weight. The preparation is complete.

[0038] The dripping speed of step c is controlled at 3 drops / s.

[0039] The activated silicon dioxide in step e is prepared by the following steps: Step A: Place the silicon dioxide in a plasma cleaning machine and treat it with oxygen plasma for 60 seconds, and the preparation is completed.

[0040] The specific surface area of the silicon dioxide in step A is 150m 2 / g.

[0041] The vacuum degree of the oxygen plasma treatment in step A is 7 Pa, the power is 200 W, and the flow rate of oxygen is 400 mL / min.

[0042] The amount of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride used in step f is 20 parts by weight.

[0043] The film-forming aid is lauryl alcohol ester.

[0044] The defoaming agent is polyether modified silicone oil.

[0045] The thickener is a water-based polyurethane thickener.

[0046] A method for preparing an antibacterial water-based paint for furniture, the method comprising the following steps: (1) Deionized water, a film-forming aid, and a defoaming agent were added to the aqueous acrylic resin emulsion, and the mixture was stirred at a speed of 500 r / min for 10 min to obtain solution A; (2) Add the modified filler to solution A and stir at a speed of 1200 r / min for 20 minutes. Finally, add the thickener and continue stirring at a speed of 300 r / min for 10 minutes. The preparation is complete.

[0047] Example 3 The invention discloses an antibacterial water-based paint for furniture. The antibacterial water-based paint is prepared from 105 parts by weight of an aqueous acrylic resin emulsion, 33 parts by weight of a modified filler, 25 parts by weight of deionized water, 2 parts by weight of a film-forming aid, 0.7 parts by weight of a defoaming agent, and 1.2 parts by weight of a thickener.

[0048] The water-based acrylic resin emulsion is directly purchased from the market.

[0049] The modified filler is prepared by the following steps: Step a: 50 parts by weight of methyl methacrylate, 45 parts by weight of butyl acrylate, 15 parts by weight of acrylic acid and 30 parts by weight of hydroxypropyl acrylate were stirred for 8 minutes to obtain a monomer mixture; Step b: taking 30% of the monomer mixture by weight, then adding 35 parts by weight of anhydrous ethanol and 1.5 parts by weight of dibenzoyl peroxide, stirring at 80° C. for 25 minutes to obtain solution a; Step c: Add 52 parts by weight of anhydrous ethanol and 2.5 parts by weight of dibenzoyl peroxide to solution a, then dropwise add the remaining monomer mixture at 80° C. while stirring. After the addition is complete, continue stirring for 2.5 hours to obtain solution b; Step d: Solution b was cooled naturally to 45° C., triethylamine was added to adjust the pH to 7, and the mixture was cooled naturally to room temperature. Finally, 25 parts by weight of deionized water was added and stirred for 13 minutes to obtain a hydroxy acrylic resin; Step e: adding 55 parts by weight of activated silica and 4.5 parts by weight of p-toluenesulfonic acid to the hydroxy acrylic resin, stirring at 43° C. for 22 hours to obtain a solution c; Step f: Add dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride to solution c, stir at 33°C for 14 hours, filter, remove the filtrate, wash with anhydrous ethanol, and finally vacuum dry at 55°C until constant weight. The preparation is complete.

[0050] The dripping speed in step c is controlled at 2.5 drops / s.

[0051] The activated silicon dioxide in step e is prepared by the following steps: Step A: Place the silicon dioxide in a plasma cleaning machine and treat it with oxygen plasma for 55 seconds, and the preparation is completed.

[0052] The specific surface area of the silicon dioxide in step A is 120 m 2 / g.

[0053] The vacuum degree of the oxygen plasma treatment in step A is 6.9 Pa, the power is 200 W, and the flow rate of oxygen is 350 mL / min.

[0054] The amount of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride used in step f is 18 parts by weight.

[0055] The film-forming aid is lauryl alcohol ester.

[0056] The defoaming agent is polyether modified silicone oil.

[0057] The thickener is a water-based polyurethane thickener.

[0058] A method for preparing an antibacterial water-based paint for furniture, the method comprising the following steps: (1) Deionized water, a film-forming aid, and a defoaming agent were added to the aqueous acrylic resin emulsion, and the mixture was stirred at a speed of 400 r / min for 8 min to obtain solution A; (2) Add the modified filler to solution A and stir at a speed of 1100 r / min for 18 minutes. Finally, add the thickener and continue stirring at a speed of 250 r / min for 8 minutes to complete the preparation.

[0059] Comparative Example 1 The invention discloses an antibacterial water-based paint for furniture. The antibacterial water-based paint is prepared from 100 parts by weight of an aqueous acrylic resin emulsion, 30 parts by weight of a modified filler, 20 parts by weight of deionized water, 1 part by weight of a film-forming aid, 0.5 parts by weight of a defoaming agent, and 1 part by weight of a thickener.

[0060] The water-based acrylic resin emulsion is directly purchased from the market.

[0061] The modified filler is prepared by the following steps: Step a: 45 parts by weight of methyl methacrylate, 40 parts by weight of butyl acrylate, 10 parts by weight of acrylic acid and 25 parts by weight of hydroxypropyl acrylate were stirred for 5 minutes to obtain a monomer mixture; Step b: taking 25% of the monomer mixture by weight, then adding 30 parts by weight of anhydrous ethanol and 1 part by weight of dibenzoyl peroxide, stirring at 70° C. for 20 minutes to obtain solution a; Step c: adding 50 parts by weight of anhydrous ethanol and 2 parts by weight of dibenzoyl peroxide to solution a, and then adding dropwise the remaining monomer mixture at 70° C. while stirring. After the addition is complete, stirring is continued for 2 hours to obtain solution b; Step d: Solution b was cooled naturally to 40° C., triethylamine was added to adjust the pH to 7, and the mixture was cooled naturally to room temperature. Finally, 20 parts by weight of deionized water was added and stirred for 10 minutes to obtain a hydroxy acrylic resin; Step e: adding dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and 4 parts by weight of p-toluenesulfonic acid to the hydroxy acrylic resin, stirring at 30° C. for 12 hours to obtain solution c; Step f: Add 50 parts by weight of activated silica to solution c, stir at 40° C. for 20 hours, filter, remove the filtrate, wash with anhydrous ethanol, and finally vacuum dry at 50° C. until constant weight. The preparation is completed.

[0062] The dripping speed of step c is controlled at 2 drops / s.

[0063] The amount of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride used in step e is 15 parts by weight.

[0064] The activated silicon dioxide described in step f is prepared by the following steps: Step A: Place the silicon dioxide in a plasma cleaning machine and treat it with oxygen plasma for 50 seconds, and the preparation is completed.

[0065] The specific surface area of the silicon dioxide in step A is 100 m 2 / g.

[0066] The vacuum degree of the oxygen plasma treatment in step A is 6.8 Pa, the power is 200 W, and the flow rate of oxygen is 300 mL / min.

[0067] The film-forming aid is lauryl alcohol ester.

[0068] The defoaming agent is polyether modified silicone oil.

[0069] The thickener is a water-based polyurethane thickener.

[0070] A method for preparing an antibacterial water-based paint for furniture, the method comprising the following steps: (1) Deionized water, a film-forming aid, and a defoaming agent were added to the aqueous acrylic resin emulsion, and the mixture was stirred at a speed of 300 r / min for 5 min to obtain solution A; (2) Add the modified filler to solution A and stir at a speed of 1000 r / min for 15 minutes. Finally, add the thickener and continue stirring at a speed of 200 r / min for 5 minutes. The preparation is complete.

[0071] Comparative Example 2 The invention discloses an antibacterial water-based paint for furniture. The antibacterial water-based paint is prepared from 100 parts by weight of an aqueous acrylic resin emulsion, 30 parts by weight of a modified filler, 20 parts by weight of deionized water, 1 part by weight of a film-forming aid, 0.5 parts by weight of a defoaming agent, and 1 part by weight of a thickener.

[0072] The water-based acrylic resin emulsion is directly purchased from the market.

[0073] The modified filler is prepared by the following steps: Step a: To a mixture of 80 parts by weight of anhydrous ethanol and 20 parts by weight of deionized water, add 50 parts by weight of activated silica, 4 parts by weight of p-toluenesulfonic acid, and dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride, stir at 30°C for 12 hours, filter, remove the filtrate, wash with anhydrous ethanol, and finally vacuum dry at 50°C until constant weight. The preparation is completed.

[0074] The activated silicon dioxide described in step a is prepared by the following steps: Step A: Place the silicon dioxide in a plasma cleaning machine and treat it with oxygen plasma for 50 seconds, and the preparation is completed.

[0075] The specific surface area of the silicon dioxide in step A is 100 m 2 / g.

[0076] The vacuum degree of the oxygen plasma treatment in step A is 6.8 Pa, the power is 200 W, and the flow rate of oxygen is 300 mL / min.

[0077] The amount of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride used in step a is 15 parts by weight.

[0078] The film-forming aid is lauryl alcohol ester.

[0079] The defoaming agent is polyether modified silicone oil.

[0080] The thickener is a water-based polyurethane thickener.

[0081] A method for preparing an antibacterial water-based paint for furniture, the method comprising the following steps: (1) Deionized water, a film-forming aid, and a defoaming agent were added to the aqueous acrylic resin emulsion, and the mixture was stirred at a speed of 300 r / min for 5 min to obtain solution A; (2) Add the modified filler to solution A and stir at a speed of 1000 r / min for 15 minutes. Finally, add the thickener and continue stirring at a speed of 200 r / min for 5 minutes. The preparation is complete.

[0082] Comparative Example 3 On the basis of Example 1, the silicon dioxide was not subjected to oxygen plasma treatment, and the rest remained unchanged.

[0083] Comparative Example 4 On the basis of Example 1, no modified filler was added and the rest remained unchanged.

[0084] Test Example 1 Antibacterial testing: The antibacterial water-based coatings prepared in Examples 1-3 and Comparative Examples 1-4 were subjected to antibacterial testing according to standard GB / T 21866-2008, and the antibacterial rate (%) was calculated. The antibacterial species tested were Escherichia coli and Aspergillus flavus, and the substrate was wood. In addition, a durability test was conducted, in which the coating test panels were left to stand for one year after preparation before undergoing antibacterial testing.

[0085] Table 1. Antibacterial test results Test Example 2 Wear resistance test: The antibacterial water-based coatings prepared in Examples 1-3 and Comparative Examples 1-4 were subjected to antibacterial testing in accordance with standard GB / T 21866-2008, and the antibacterial rate (%) was calculated or the surface condition of the coating test plate after sandpaper friction was observed. Before the antibacterial test, 800-grit sandpaper was used to rub the surface of the coating test plate back and forth 10 times (one back and forth counted as one time). The bacterial species tested in the antibacterial test were Escherichia coli and Aspergillus flavus, and the substrate was a wooden board.

[0086] Table 2. Wear resistance test results By comparing Examples 1-3, Comparative Examples 1-4 and Test Examples 1-2, it can be seen that: The difference between Comparative Example 1 and Example 1 is that dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride is grafted onto the hydroxy acrylic resin.

[0087] The difference between Comparative Example 2 and Example 1 is that no hydroxy acrylic resin is added to the modified filler for reaction.

[0088] The difference between Comparative Example 3 and Example 1 is that the silicon dioxide is not subjected to oxygen plasma treatment.

[0089] The difference between Comparative Example 4 and Example 1 is that no modified filler is added.

[0090] Comparison between Examples 1-3, Comparative Examples 1-4 and Test Example 1 shows that the antibacterial water-based coating prepared by the present invention has excellent antibacterial and antimicrobial properties, and still exhibits strong antibacterial properties and good durability after being naturally placed for one year.

[0091] From the comparison of Examples 1-3, Comparative Examples 1-4 and Test Example 2, it can be seen that the antibacterial water-based coating prepared by the present invention has excellent wear resistance, and can effectively promote the water-based coating to better exert its antibacterial and antimicrobial capabilities in practical applications.

[0092] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An antibacterial water-based paint for furniture, characterized by: The antibacterial water-based paint is prepared from 100-110 parts by weight of an aqueous acrylic resin emulsion, 30-35 parts by weight of a modified filler, 20-30 parts by weight of deionized water, 1-3 parts by weight of a film-forming aid, 0.5-1 parts by weight of a defoamer, and 1-1.5 parts by weight of a thickener.

2. The antibacterial water-based paint for furniture according to claim 1, characterized in that: The modified filler is prepared by the following steps: Step a: stirring 45-55 parts by weight of methyl methacrylate, 40-50 parts by weight of butyl acrylate, 10-20 parts by weight of acrylic acid and 25-35 parts by weight of hydroxypropyl acrylate for 5-10 minutes to obtain a monomer mixture; Step b: taking 25-35% of the monomer mixture by weight, then adding 30-40 parts by weight of anhydrous ethanol and 1-2 parts by weight of dibenzoyl peroxide, stirring at 70-90° C. for 20-30 minutes to obtain solution a; Step c: adding 50-55 parts by weight of anhydrous ethanol and 2-3 parts by weight of dibenzoyl peroxide to solution a, and then adding dropwise the remaining monomer mixture at 70-90° C. while stirring. After the addition is complete, stirring is continued for 2-3 hours to obtain solution b; Step d: Cooling solution b naturally to 40-50° C., then adding triethylamine to adjust the pH to 7, cooling naturally to room temperature, and finally adding 20-30 parts by weight of deionized water, stirring for 10-15 minutes to obtain a hydroxy acrylic resin; Step e: adding 50-60 parts by weight of activated silica and 4-5 parts by weight of p-toluenesulfonic acid to the hydroxy acrylic resin, stirring at 40-45° C. for 20-24 hours to obtain solution c; Step f: Add dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride to solution c, stir at 30-35°C for 12-16 hours, filter, remove the filtrate, wash with anhydrous ethanol, and finally vacuum dry at 50-60°C until constant weight. The preparation is complete.

3. The antibacterial water-based paint for furniture according to claim 2, characterized in that: The dripping speed in step c is controlled at 2-3 drops / s.

4. The antibacterial water-based paint for furniture according to claim 2, characterized in that: The activated silicon dioxide in step e is prepared by the following steps: Step A: Place the silicon dioxide in a plasma cleaning machine and treat it with oxygen plasma for 50-60 seconds, and the preparation is completed.

5. The antibacterial water-based paint for furniture according to claim 4, characterized in that: The specific surface area of the silicon dioxide in step A is 100-150m 2 / g.

6. The antibacterial water-based paint for furniture according to claim 4, characterized in that: The vacuum degree of the oxygen plasma treatment in step A is 6.8-7 Pa, the power is 200 W, and the flow rate of oxygen is 300-400 mL / min.

7. The antibacterial water-based paint for furniture according to claim 2, characterized in that: In step f, the amount of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride used is 15-20 parts by weight.

8. The antibacterial water-based paint for furniture according to claim 1, characterized in that: The film-forming aid is lauryl alcohol ester.

9. The antibacterial water-based paint for furniture according to claim 1, characterized in that: The defoaming agent is polyether modified silicone oil.

10. A method for preparing an antibacterial water-based paint for furniture according to any one of claims 1 to 9, characterized in that: The preparation method comprises the following steps: (1) Deionized water, a film-forming aid, and a defoaming agent were added to the aqueous acrylic resin emulsion, and the mixture was stirred at a speed of 300-500 r / min for 5-10 min to obtain a solution A; (2) Add the modified filler to solution A and stir at a speed of 1000-1200 r / min for 15-20 minutes to mix. Finally, add the thickener and continue stirring at a speed of 200-300 r / min for 5-10 minutes to complete the preparation.

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