CN100503753C - A kind of nano antibacterial water-based wood paint and preparation method thereof - Google Patents

Abstract

The invention discloses a preparing method of single component nanometer antibiotic water-based woodware paint, which is characterized by the following: the three diverse water-based polyurethane resin emulsion, water-based acrylic acid modified polyurethane resin emulsion and nanometer water-based acrylic resin emulsion are mixed with diverse ratio as film forming matter; it drops the cost of this product and possesses merits of low VOC value, blocking resistance, fish tail tolerant, pollution tolerant, yellowed tolerant and good blocking; the organic swelled ground prefabricated sol is the carrier of compositing type inorganic antibacterial agent, it incorporates multiple inorganic nanometer composition. This invention is easy to process, which can resolve craft problems of sedimentation, discoloration and birdnesting.

Description

A kind of nano antibacterial water-based wood paint and preparation method thereof

【Technical field】

The invention relates to a paint, in particular to a single-component nanometer antibacterial water-based wood paint and a preparation method thereof.

【Background technique】

At present, most of the traditional wood lacquers are solvent-based wood lacquers, mainly solvent-based polyurethane and nitro-lacquer. Due to the relatively high total volatile organic compound (VOC), this kind of wood lacquer has relatively large environmental pollution and affects people's health. Especially with the widespread use of computers, people's lifestyles have gradually changed from outdoors to indoors, which is more likely to cause serious "indoor environmental pollution".

Internationally, the use of solvent-based wood lacquers has been strictly restricted. In Europe, the production and sales of solvent-based paints were completely banned in 2004. my country also plans to completely ban solvent-based wood lacquers by 2008. And water-based wood lacquer has become the darling of the market because it does not pollute the environment, and has a very broad market prospect.

There are two types of water-based wood lacquers currently on the market: one-component and two-component. As described in domestic patent applications 200410075486.1 and 02125991.7, they are all two-component water-based wood lacquers. The performance of this two-component water-based wood ware paint is generally better than that of single-component water-based wood ware lacquers, but the price is expensive, and the two components must be mixed before use. The components are mixed in a specific ratio, and the film is formed through a cross-linking and curing reaction. It is very inconvenient to construct and use, and requires high quality of construction personnel. The premature mixing of the two components, improper mixing ratio or uneven mixing will cause serious quality problems, which limits its application. Therefore, more single-component types are used in the market. As described in domestic patent applications 02100113.8, 200510065482.X, 02125992.5, 03141382.X, 200510102460.6 are all single water-based wood lacquers.

Due to the improvement of people's living standards, whether the water-based wood paint for purchase has an "antibacterial" effect has increasingly become the focus of attention of users. In patent applications 200410075486.1 and 200410065860.X, nano-titanium dioxide (actually anatase crystalline nano-titanium dioxide, also known as photocatalyst) is used as the main antibacterial component. The disadvantage is that photocatalytic reactions need to occur under the irradiation of ultraviolet light (including the ultraviolet band in natural light) , and will cause degradation of organic components including the paint itself.

Patent application 02120734.8 uses an organic antibacterial agent, which has the disadvantages of poor stability, easy degradation, and harmful residues. In the patent 200510102460.6, the mixed dispersion of nano-silver powder and photocatalyst powder is used as an antibacterial component. The main problem is that silver is easily oxidized and discolored, and its stability is poor. Nano-silver powder and nano-titanium dioxide powder are also easy to agglomerate and settle, which is especially not suitable for topcoat varnishes.

【Content of invention】

The object of the present invention is to provide a green environmental protection water-based wood paint with low cost, easy to use, and good antibacterial and antifungal function and stability.

In order to achieve the above-mentioned technical purpose, the present invention adopts the following technical scheme to realize, a kind of nanometer antibacterial water-based wood ware paint, comprising the film-forming material that is the mixture of water-based polyurethane resin emulsion, water-based acrylic modified polyurethane resin emulsion and nanometer water-based acrylic resin emulsion , and nanocomposite inorganic antibacterial agents.

In order to further realize the above-mentioned technical scheme, the nano antibacterial water-based wood paint includes the following components (W/W): 10-20% of water-based polyurethane emulsion, 10-20% of water-based acrylic modified polyurethane resin emulsion and 30-20% of nanometer water-based acrylic resin emulsion. 60%, nanocomposite inorganic antibacterial agent 0.5-3.0%, nano anti-sedimentation thickener 0.1-0.3%, nano anti-fouling agent 1.0-3.0%, nano anti-aging agent 1.0-3.0%, nano amphoteric agent 1.0-3.0 %, nanometer wear-resistant hardener 1.0-3.0%, wetting and dispersing agent 0.5-1.0%, defoamer 0.2-0.4%, leveling agent 0.2-0.4%.

In order to further realize the above-mentioned technical purpose, the nanocomposite inorganic antibacterial agent uses organic expansive soil prefabricated sol as a carrier, and contains nano-silver, nano-zinc oxide, nano-alumina, nano-titanium dioxide and nano-silicon dioxide.

Another object of the present invention is to provide a preparation method of nano antibacterial water-based wood varnish.

In order to achieve the above-mentioned technical purpose, the present invention adopts the following technical scheme to realize, a kind of preparation method of nano antibacterial water-based wood lacquer, comprises the steps:

(1) Preparation of nanocomposite inorganic antibacterial agent: Add appropriate amount of silver nitrate, zinc nitrate, reducing agent and stabilizer into pure water, after full reaction, add 5% (W/W) organic bentonite, and heat to 50°C in water bath , add nano-zinc oxide, nano-titanium dioxide, nano-alumina and nano-silicon dioxide with a mass percentage of no more than 2.5% of the anatase crystal form, fill with nitrogen protection, stir at a high speed of 1500-2000rpm for 3-4 hours, cool down after stirring, and seal Leave it to stand for 12 hours until it becomes gelatinous.

(2) Mix water-based polyurethane emulsion, water-based acrylic modified polyurethane resin emulsion, and nanometer water-based acrylic resin emulsion according to the ratio (W/W) of 10-20%: 10-20%: 30-60%, stir for 10 minutes, and rotate 600-700rpm.

(3) Mix and stir water, wetting agent and defoamer, add nano-composite inorganic antibacterial agent, nano-stain-resistant agent, nano-anti-aging agent, nano-amphiphobic agent and nano-abrasion-resistant hardener in turn, stir for 15 minutes, and rotate at 700-800rpm.

(4) The above-mentioned slurry is ground to ≤10 microns by a sand mill or a three-roll machine, and filtered through a 500-mesh standard sieve.

(5) Add the mixed liquid obtained in step (4) into the emulsion prepared in step (2), and stir at a high speed for 10 minutes at a speed of 1000-1200 rpm.

(6) Add nano anti-settling thickener, leveling agent, and other additives in sequence, and stir for 30 minutes at a speed of 900-1000rpm.

(7) Finish the stirring, filter and separate to obtain the finished product.

In the present invention, three different water-based polyurethane resin emulsions, water-based acrylic modified polyurethane resin emulsions and nanometer water-based acrylic resin emulsions are mixed in different proportions as film-forming materials, and while successfully reducing product costs, they also have low VOC values , anti-adhesion, scratch resistance, pollution resistance, yellowing resistance and good sealing characteristics. Among the three emulsions, the water-based polyurethane emulsion has good film fullness, paint film hardness and scratch resistance, but the cost and VOC value are higher; the water-based acrylic modified polyurethane emulsion has excellent wear resistance, heat stability and freeze-thaw resistance. However, the yellowing resistance and pollution resistance are slightly poor; the nano water-based acrylic emulsion has low cost, zero VOC, good flexibility, pollution resistance and sealing performance, but the hardness and wear resistance are low, and the three are mixed in a certain proportion. Carry out complementary advantages and achieve balance in all aspects to ensure that product performance is fully up to standard.

The composite inorganic antibacterial agent used in the present invention uses organic expansive soil prefabricated sol as a carrier and contains various inorganic nano-components. The technical problems of easy sedimentation, easy discoloration and easy agglomeration during the production and processing of antibacterial agents.

The present invention uses a variety of nano functional additives including nano anti-sedimentation thickener, nano anti-fouling agent, nano anti-aging agent, nano amphiphobic agent, nano wear-resistant hardener, etc. Wear resistance, aging resistance, water resistance, heat resistance, acid and alkali resistance and many other performance advantages. Due to the selection of nano functional additives are zero VOC and inorganic products, the environmental protection performance of the product is further improved.

Users can add one or more other additives with different contents in the present invention according to different use environments and operating conditions. For example, colored paint can be made by adding pigments and dyes, matte paint can be made by adding matting agent, drier can be added when used in humid environment in the south, and antifreeze can be added when used and transported under low temperature conditions in the north.

【Detailed ways】

The present invention will be further described below in conjunction with embodiment.

Embodiment one:

The following is an implementation (topcoat) preparation formula composition (W/W):

Water-based polyurethane resin emulsion 20%

Waterborne acrylic modified polyurethane resin emulsion 20%

Nano water-based acrylic resin emulsion 40%

Nano-composite inorganic antibacterial agent 0.5%

Nano anti-settling thickener 0.2%

Nano Stain Resistant Agent 1.0%

Nano anti-aging agent 1.0%

Nano-amphiphobic agent 1.0%

Nano wear-resistant hardener 2.0%

Wetting and dispersing agent 0.8%

Defoamer 0.4%

Leveling agent 0.4%

Emulsifying wax 0.8%

Water 12%

The preparation process of above-mentioned embodiment is:

(1) Mix the three emulsions in proportion and stir for 10 minutes at a speed of 600-700rpm.

(2) Mix and stir water, wetting agent and defoamer, add nano-composite inorganic antibacterial agent, nano-stain-resistant agent, nano-anti-aging agent, nano-amphiphobic agent and nano-abrasion-resistant hardener in turn, stir for 15 minutes, and rotate at 700-800rpm.

(3) The above-mentioned slurry is ground to ≤10 microns by a sand mill or a three-roll machine, and filtered through a 500-mesh standard sieve.

(4) Add the mixture obtained in (3) into the emulsion in (1), and stir at high speed for 10 minutes at a speed of 1000-1200 rpm.

(5) Add nano anti-settling thickener, leveling agent and emulsifying wax in turn, stir for 30 minutes, and rotate at 900-1000rpm.

(6) Finish the stirring, filter and separate to obtain the finished product.

The preparation method of above-mentioned nano-composite inorganic antibacterial agent component is: add appropriate amount of silver nitrate, zinc nitrate together with reducing agent, stabilizing agent into pure water, after full reaction, add the organic bentonite of 5% (W/W), water bath heating to 50°C, add nano-zinc oxide, nano-titanium dioxide (wherein the mass percentage of anatase crystal form is not more than 2.5%), nano-alumina and nano-silicon dioxide, fill with nitrogen protection, stir at 1500-2000rpm at high speed for 3-4 hours, stir Cool down after the end, airtight and let stand for 12 hours until it becomes gel. The preparation method of the nanocomposite inorganic antibacterial agent component is the same in the following examples.

Embodiment two:

Nano antibacterial water-based wood lacquer floor finish preparation formula composition (W/W):

Water-based polyurethane resin emulsion 20%

Waterborne acrylic modified polyurethane resin emulsion 20%

Nano water-based acrylic resin emulsion 40%

Nano-composite inorganic antibacterial agent 0.8%

Nano anti-settling thickener 0.2%

Nano anti-fouling agent 2.0%

Nano anti-aging agent 1.0%

Nano-amphiphobic agent 1.0%

Nano wear-resistant hardener 3.0%

Wetting and dispersing agent 1.0%

Defoamer 0.4%

Leveling agent 0.3%

Slip agent 0.5%

Negative ion generator 0.5%

Water 9.4%

Embodiment three:

Preparation formula composition of nano antibacterial water-based wood furniture matte finish (W/W):

Water-based polyurethane resin emulsion 10%

Waterborne acrylic modified polyurethane resin emulsion 10%

Nano water-based acrylic resin emulsion 60%

Nano-composite inorganic antibacterial agent 1.5%

Nano anti-settling thickener 0.2%

Nano anti-fouling agent 3.0%

Nano anti-aging agent 3.0%

Nano-amphiphobic agent 3.0%

Wetting and dispersing agent 1.0%

Defoamer 0.2%

Leveling agent 0.4%

Negative ion generator 0.5%

Matting agent 1.0%

Water 6.2%

Embodiment four:

Preparation formula composition of nano antibacterial water-based colored home decoration finish paint (W/W):

Water-based polyurethane resin emulsion 15%

Waterborne Acrylic Modified Polyurethane Resin Emulsion 15%

Nano water-based acrylic resin emulsion 30%

Nano-composite inorganic antibacterial agent 3.0%

Nano anti-settling thickener 0.3%

Nano anti-fouling agent 1.0%

Nano anti-aging agent 3.0%

Nano-amphiphobic agent 1.0%

Nano wear-resistant hardener 1.0%

Wetting and dispersing agent 1.0%

Defoamer 0.4%

Leveling agent 0.4%

Plasticizer 0.3%

Pigment 15%

Water 13.6%

Embodiment five:

Nano antibacterial water-based wood paint antifreeze topcoat formulation composition (W/W):

Water-based polyurethane resin emulsion 15%

Waterborne Acrylic Modified Polyurethane Resin Emulsion 15%

Nano water-based acrylic resin emulsion 45%

Nano-composite inorganic antibacterial agent 2.0%

Nano anti-sedimentation thickener 0.3%

Nano anti-fouling agent 3.0%

Nano anti-aging agent 1.0%

Nano-amphiphobic agent 1.0%

Nano wear-resistant hardener 1.0%

Wetting and dispersing agent 0.6%

Defoamer 0.2%

Leveling agent 0.4%

Slip agent 0.5%

Antifreeze 4.5%

Water 8.5%

Embodiment six:

Nano antibacterial water-based wood paint primer formulation composition (W/W):

Nano water-based acrylic resin emulsion 80%

Nano-composite inorganic antibacterial agent 0.5%

Nano anti-settling thickener 0.5%

Nano Stain Resistant Agent 0.5%

Nano silica 1.5%

Nano Titanium Dioxide 1.0%

Wetting and dispersing agent 0.8%

Defoamer 1.0%

Leveling agent 0.8%

Grinding aid 2.0%

Water 11.4%

The antibacterial property of the product of the present invention is tested by the Guangdong Microbiological Analysis and Testing Center according to the IC/T897-2002 standard, and the antibacterial rate to Escherichia coli (ATC25922) and Staphylococcus aureus (ATC6358) is all 99.9%.

Embodiment seven:

The construction process of nano antibacterial water-based wood paint:

(1) Wood grinding:

The surface of the wood to be painted should be first ground with 200# emery cloth and then polished with 1000# emery cloth to make it smooth and smooth. Remove the sanded ash with a wet rag, clean it thoroughly and dry it before painting.

(2) The first primer:

The main function of the first primer is to cover the back. When painting, the paint solution should be diluted, and 10-30% of water can be added to dilute it before painting, so that the paint solution can flow into the pores of the wood, which is conducive to increasing the adhesion of the paint film. The paint liquid must pass through a 200-mesh silk screen before use, especially for spraying, it must be filtered before use. After the first coat of paint is dry (depending on the temperature and temperature, it takes about 2-8 hours), use 1000# sandpaper to remove the erected burrs on the wood surface to make the surface basically smooth.

(3) Primer back cover:

Depending on the roughness of the wood surface, 1 or 2 coats of primer can be applied. The particularly uneven surface can be brushed more. Generally, two coats are enough, and the interval between each coat is at least 0.5h (after the first coat is hard, then the second coat is applied). Do not grind too hard, just lightly sand to remove extreme unevenness and then apply a primer. Put it aside for at least 2 hours after the back cover, and smooth it with sandpaper (the longer the air time is, the better it will be polished), and it is best to smooth it with 1200-1500# sandpaper. However, water grinding is not allowed where water may cause wood warping, deformation, and glue opening. Rinse clean after water grinding, dry and dry before proceeding to the next coating.

(4) Rich primer

The wood surface after the back cover can be polished and cleaned, and then the primer can be applied. After 2 hours, lightly polish and then apply another coat. If water grinding is required, the storage time should be longer (more than 4 hours). Repeat this process, regrind, and repaint until you are satisfied. The more you apply, the better the fullness. This step can be chosen according to user needs.

(5) top coat

On the basis of primer, apply 1 to 3 coats of glossy finish or matte finish, usually not less than 2 coats. Before applying each topcoat, the previous topcoat must be lightly sanded with 1200-1500# sandpaper to increase the adhesion between coats. Applying matte paint on top of gloss paint can change the coating to a matte type, while applying gloss paint on top of matte paint may reduce the brightness of the paint film, and the maximum brightness and transparency cannot be achieved. Before painting the topcoat, no matter brushing or spraying, it should be filtered through 200# silk screen before construction.

(6) spraying construction

Spray applied paint films are smoother than brush applied paint films. For spraying water-based wood paint, add a small amount of water to dilute the original paint and use it now. The viscosity of the diluted paint solution should be about 18s in 4 cups. After diluting and stirring, it should be left to stand for at least 20 minutes, and the bubbles that have been stirred in have basically disappeared before painting. Before spraying, the paint liquid must be filtered through a 200-mesh silk screen, so as not to bring in impurities and affect the quality of the paint film. Spraying is generally advisable to use two crosses. The amount of paint produced should not be too large, and it should not be sprayed too thick, otherwise it will easily cause problems such as sagging and orange peel. If you want to increase the thickness of the paint film, it is advisable to use multiple spraying methods to solve it.

Various nano-auxiliaries in the components of the present invention can be selected from a series of nano-auxiliaries produced or provided by Jiangsu Chenguang Nano Material Technology Co., Ltd., Beijing Shouchuang Nano Technology Co., Ltd. and Guangzhou Yunxing Scientific Instrument Co., Ltd. Wetting and dispersing agents, defoamers, and leveling agents are all kinds of products commonly used in the market. Wetting and dispersing agents can be selected from the SN-DISPERSANT series of Japan Nopco Company, the OROTAN series of Rohm and Haas Company of the United States, the TEGO series of German Tego Company, and the EFKA series of Holland Efka Company, etc. The defoaming agent can be BYK series of German BYK company, EFKA series of Holland Efka company, PLURIOL series of German BASF company, etc. Leveling agents include RM series of Rohm and Haas Company of the United States, RHEOLATE series of Jinhui Company, SUNFYNOL series of American Gas Chemical Company, TEGO series of German Tego Company, etc.

The above are the best implementation modes of the present invention. Based on the disclosed content of the present invention, some similarities and alternatives that those skilled in the art can obviously think of should fall into the protection scope of the present invention.

Claims (5)

1. A nanometer antibacterial water-based wood paint, is characterized in that, comprises the film-forming thing of composition with the mixture of water-based polyurethane resin emulsion, water-based acrylic modified polyurethane resin emulsion and nanometer water-based acrylic resin emulsion, and nanocomposite inorganic antibacterial agent; The nano-composite inorganic antibacterial agent uses organic expansive soil prefabricated sol as a carrier, and contains nano-silver, nano-zinc oxide, nano-alumina, nano-titanium dioxide and nano-silicon dioxide. 2. nano antibacterial water-based wood varnish according to claim 1, is characterized in that, the formula of described film former consists of (W/W): Waterborne polyurethane resin emulsion 10-20%; Waterborne acrylic modified polyurethane resin emulsion 10-20%; Nano water-based acrylic resin emulsion 30-60%. 3. according to claim 1 and 2 described nano antibacterial water-based wood lacquers, it is characterized in that, comprise following component (W/W): Water-based polyurethane emulsion 10-20%; Waterborne acrylic modified polyurethane resin emulsion 10-20%; Nano water-based acrylic resin emulsion 30-60%; Nanocomposite inorganic antibacterial agent 0.5-3.0%; Nano anti-settling thickener 0.1-0.3%; Nano anti-fouling agent 1.0-3.0%; Nano anti-aging agent 1.0-3.0%; Nano-amphiphobic agent 1.0-3.0%; Nano wear-resistant hardener 1.0-3.0%; Wetting and dispersing agent 0.5-1.0%; Defoamer 0.2-0.4%; Leveling agent 0.2-0.4%. 4. nano antibacterial water-based wood lacquer according to claim 3, is characterized in that, also comprises at least one other auxiliary agent 3.0-24.5%, and described other auxiliary agent is emulsifying wax, slip agent, anion generating agent, pigment , dyes, matting agents, drier, antifreeze. 5. a preparation method of nanometer antibacterial water-based wood lacquer, is characterized in that, comprises the steps: (1) Preparation of nanocomposite inorganic antibacterial agent: Add appropriate amount of silver nitrate, zinc nitrate, reducing agent and stabilizer into pure water, after full reaction, add 5% (W/W) organic bentonite, and heat to 50°C in water bath , add nano-zinc oxide, nano-titanium dioxide, nano-alumina and nano-silicon dioxide with a mass percentage of no more than 2.5% of the anatase crystal form, fill with nitrogen protection, stir at a high speed of 1500-2000rpm for 3-4 hours, cool down after stirring, and seal Let it stand for 12 hours, and it will become a gel for use; (2) Mix water-based polyurethane emulsion, water-based acrylic modified polyurethane resin emulsion, and nanometer water-based acrylic resin emulsion according to the ratio (W/W) of 10-20%: 10-20%: 30-60%, stir for 10 minutes, and rotate 600-700rpm; (3) Mix and stir water, wetting agent and defoamer, add nano-composite inorganic antibacterial agent, nano-stain-resistant agent, nano-anti-aging agent, nano-amphiphobic agent and nano-abrasion-resistant hardener in turn, stir for 15 minutes, and rotate at 700-800rpm; (4) The above-mentioned slurry is ground to ≤10 microns by a sand mill or a three-roll machine, and filtered through a 500-mesh standard sieve; (5) Add the mixed solution obtained in step (4) into the emulsion prepared in step (2), stir at high speed for 10 minutes, and rotate at 1000-1200rpm; (6) Add nano anti-settling thickener, leveling agent, and other additives in turn, stir for 30 minutes, and rotate at 900-1000rpm; (7) Finish the stirring, filter and separate to obtain the finished product.