CN1320069C - Nano titanium dioxide/nano silver coating and preparation method thereof - Google Patents

Abstract

The invention relates to a nano-titanium dioxide/nano-silver coating and a preparation method thereof. The present invention is characterized in that two kinds of nanoparticles, nano-titanium dioxide and nano-silver, are used. The coating solves the shortcomings of existing coatings such as poor stain resistance, poor weather resistance, and non-environmental protection, and has excellent new functions such as self-cleaning, sterilization, and air purification. . The antibacterial performance of the coating is further improved, so that it still has a good antibacterial effect in a dark or dry situation, greatly expanding the scope of use.

Description

A kind of nano-titanium dioxide/nano-silver coating and preparation method thereof

technical field

The invention relates to the field of building materials, in particular to an environment-friendly nano-titanium dioxide/nano-silver coating with good antibacterial properties and a preparation method thereof.

Background technique:

Since nano-titanium dioxide has special photocatalytic properties, super-hydrophilicity, and UV shielding properties, applying it to coatings and keeping them in a nano-scale state in the coatings can not only improve the shortcomings of existing coatings such as poor weather resistance and easy staining, At the same time, it can also endow the coating with good antibacterial, self-cleaning and air-purifying properties. It can be widely used in high-end decoration of families, schools, hospitals, kindergartens, high-end hotels, and commercial buildings. In places with high humidity and serious pollution in the south, it is more suitable Competitive in the market.

Nano-titanium dioxide coating can remove bacteria and purify the air because the electrons in its valence band are excited to the conduction band under the condition of light or water, and holes are generated in the valence band, and free electron-hole pairs can make oxygen Activated with water to produce active oxygen and OH free radicals with high reactivity, which have a strong degradative effect on harmful gases in the air (nitrogen oxides, sulfur dioxide, formaldehyde, benzene, ammonia, acetone, etc.) and bacteria, thus Endows the coating with good antibacterial and air-purifying properties.

It can be seen from the above that the nano-titanium dioxide coating has antibacterial and air-purifying properties only under light or water conditions, which limits its application in dark or dry areas.

Silver has good antibacterial and bactericidal effects, and is not affected by environmental conditions. A long time ago, the Mongolians discovered that using silver tableware to hold goat milk can keep it fresh. More than 300 BC, when the Greek emperor Alexander led his troops to the east, he was infected by tropical dysentery, and most of the soldiers died of the disease. However, the emperor and military officers rarely contracted diseases because they used silver utensils, which can sterilize bacteria. In 1893, Swiss botanist Lacklin discovered that 0.01 μg/L of silver ions could kill bacteria in algae.

Nano-silver has a small diameter and a large contact area, and its bactericidal effect is hundreds of times that of ordinary silver.

Combining nano-silver and nano-titanium dioxide can further improve the antibacterial property of the coating. On the one hand, nano-silver exists as an impurity, which can enhance the photocatalytic performance of nano-titanium dioxide; on the other hand, nano-silver slowly releases Ag ⁺ , which can destroy the bacterial cell membrane or strongly attract the sulfhydryl group of the enzyme protein in the bacterial body, and quickly combine Together, they reduce the activity of the original biologically active enzymes, have strong bactericidal properties, and are not affected by external conditions (light and water).

In this way, the prepared coating has good antibacterial properties no matter it is in a dark or dry area, which greatly expands its application range.

Contents of the invention

An object of the present invention is to provide a coating capable of organically combining nano-titanium dioxide and nano-silver and its preparation method to solve the problems of existing coatings such as poor stain resistance, poor weather resistance, and non-environmental protection. New functions such as self-cleaning, antibacterial and air purification.

Another object of the present invention is to further improve the antibacterial performance of the paint after adding nano-silver in the paint, so that its application will not be affected by environmental conditions and expand its application range.

Therefore, the present invention is achieved like this:

A nano titanium dioxide/nanometer silver coating is characterized in that the coating contains nano titanium dioxide and nano silver.

Specifically, described nano-titanium dioxide/nano-silver coating, it is made according to following formula:

Water: 50-300 kg; Dispersant: 5-12 kg;

Wetting and dispersing agent: 0.1-1 kg; Defoaming agent: 1-5 kg;

Thickener: 1-15 kg; Coalescing agent: 5-15 kg;

Leveling agent: 1-15 kg; nano-titanium dioxide dispersion 10-100 kg;

Nano silver solution 10-100 kg; Titanium dioxide: 30-400 kg;

Ultrafine aluminum silicate: 10-50 kg; lithopone: 0-150 kg;

Light calcium carbonate: 0-250 kg; Heavy calcium carbonate: 0-150 kg;

Talc powder: 0-100 kg; Wollastonite powder: 0-150 kg;

Base material: 100-500 kg;

Among them, dispersants, defoamers, thickeners, leveling agents, wetting and dispersing agents and film-forming aids are frequently used products for formulating coatings. Dispersants include SN-DISPERSANT series dispersants from Nopco, Japan, OROTAN series from Rohm and Haas, Disperbyk from Germany, Texaphor series from Henkel, Hydropalat series Dispersants, DP series dispersants of Deqian Enterprise Co., Ltd., EFKA series dispersants, EFKA-POLYMER series dispersants, EFKA-LP series dispersants of Holland Efka Auxiliary Co., Ltd., German Tego company's Dispers series dispersants Antifoaming agents, etc.; defoaming agents include Henkel's Foamstar series defoaming agents, Byk series defoaming agents from Germany Byk Chemicals, Efka series defoaming agents from Dutch Efka additives, etc.; thickeners include American Rohm Acrysol series thickeners and cellulose ether thickeners of Haas Company, Rheolate thickener series of Jinhui Company, etc.; leveling agents include RM series leveling agents of Rohm and Haas Company of the United States, Rheolate series of Jinhui Company Leveling agent, etc.; film-forming aids include Eastman’s Texano1 ester, Henkel’s Filmer series of film-forming aids, etc.; wetting and dispersing agents are Henkel’s PE series of wetting and dispersing agents.

Titanium dioxide is white, and it is used as a representative of pigments. If it is necessary to formulate other colors of paint, then add other colors of pigments to the formula.

The base material is any one of pure acrylic, styrene-acrylic, vinegar-acrylic, silicon-acrylic emulsion or any mixture thereof.

The nano titanium dioxide is rutile type, anatase type, brookite type, mixed crystal type and amorphous type.

The diameter range of the nano-titanium dioxide particles is 1-100nm, and the particle diameter of the nano-silver is 1-200nm.

The preparation method of above-mentioned nano titanium dioxide/nanometer silver coating is:

(1) Mix the nano-titanium dioxide stock solution and the nano-silver solution evenly to form a nano-titanium dioxide/nano-silver mixed solution;

(2) Mix the above-mentioned nano-titanium dioxide/nano-silver mixture, film-forming aids, wetting and dispersing agents, dispersants, leveling agents, defoamers, water, titanium dioxide, lithopone, ultrafine aluminum silicate, talcum Powder, wollastonite, light calcium carbonate and heavy calcium carbonate were weighed respectively and added to the mixing tank, mixed and stirred evenly, the speed was controlled at 1000-2000r·min ^-1 , and stirred for 20-60min to obtain a slurry.

(3) Grind the above slurry to an appropriate fineness by a sand mill or a three-roll mill.

(4) Add the emulsion base material to the above slurry, and add a thickener to a certain viscosity to obtain the product.

In the above step (3), the grinding fineness is required to be ≤60 μm (for exterior wall paint), or ≤50 μm (for interior wall paint).

In the above-mentioned step (4), it is required to control the viscosity in an appropriate range, and add a thickener to a Stormo viscosity of 90-110K.

The invention well solves the technical problem that the nanoparticles are easy to agglomerate in the paint system, and the prepared paint has good weather resistance, scrub resistance, stain resistance, antibacterial property, self-cleaning property and air purification performance. By adding nano-silver, the antibacterial property of the paint is further improved, so that it still has good antibacterial property in dark or dry areas, greatly expanding the scope of application.

Detailed ways

Embodiment one:

The preparation formula of this embodiment is:

Tap water: 220 kg; Dispersant: 8 kg;

Defoamer: 4 kg; Wetting and dispersing agent: 0.2 kg;

Thickener: 20 kg; Leveling agent: 10 kg;

Coalescing agent: 15 kg; Styrene-acrylic emulsion: 150 kg;

Titanium dioxide: 60 kg; Nano silver solution: 20 kg;

Nano titanium dioxide dispersion: 20 kg; Ultrafine aluminum silicate: 20 kg;

Talc powder: 80 kg; Lithopone: 120 kg;

Heavy calcium carbonate: 100 kg; Light and heavy calcium carbonate: 100 kg.

Its preparation recipe is:

(1) Mix the nano-titanium dioxide dispersion/nano-silver solution evenly.

(2) Mix the uniformly mixed nano-titanium dioxide/nano-silver particle mixture, film-forming aids, and leveling agents. Dispersant, wetting and dispersing agent, defoamer, water, titanium dioxide, superfine aluminum silicate, talcum powder, lithopone, heavy calcium carbonate, and light calcium carbonate were weighed and added to the mixing barrel, and stirred evenly. The rotating speed is controlled at 1100r/min, and stirred for 30min to obtain a slurry;

(3) Grinding the above slurry with a sand mill or a three-roll mill to a fineness of ≤40 μm.

(4) Add styrene-acrylic emulsion to the above slurry, add a thickener until the Stormer viscosity is 100K, and the product can be obtained.

Embodiment two:

The preparation formula of this embodiment is:

Tap water: 100 kg; Dispersant: 6 kg;

Defoamer: 5 kg; Thickener: 5 kg;

Leveling agent: 3 kg; film-forming aid: 5 kg;

Wetting and dispersing agent 0.3 kg Silicone acrylic emulsion: 300 kg

Ultrafine aluminum silicate: 10 kg; Titanium dioxide: 300 kg;

Talc powder: 40 kg; Light calcium carbonate: 50 kg;

Wollastonite: 100 kg; Nano silver solution: 10 kg;

Nano-titanium dioxide dispersion: 10 kg.

Its preparation method is:

(1) Mix the nano-titanium dioxide dispersion liquid and the nano-silver solution evenly.

(2) Mix uniformly mixed nano-titanium dioxide/nano-silver mixed solution, wetting and dispersing agent, film-forming aid, leveling agent, dispersant, defoamer, water, talcum powder, titanium dioxide, ultrafine aluminum silicate, Wollastonite and light calcium carbonate were respectively weighed and added to the mixing tank, stirred evenly, the rotating speed was controlled at 1200r/min, and stirred for 20min to obtain a slurry;

(3) Grinding the above slurry with a sand mill or a three-roll mill to a fineness of ≤50 μm.

(4) Add the silicone acrylic emulsion to the above slurry, add a thickener until the Stormer viscosity is 100K, and the product can be obtained.

Embodiment three:

The preparation formula of this embodiment is:

Tap water: 200 kg; Dispersant: 10 kg;

Defoamer: 5 kg; Thickener: 15 kg;

Leveling agent: 6 kg; film-forming aid: 12 kg;

Wetting and dispersing agent 0.1 kg Vinegar-acrylic emulsion: 200 kg

Ultrafine aluminum silicate: 10 kg; Titanium dioxide: 200 kg;

Talc powder: 50 kg; Light calcium carbonate: 70 kg;

Lithopone: 120 kg; Ground calcium carbonate: 80 kg;

Nano silver solution: 10 kg; Nano titanium dioxide dispersion: 30 kg.

Its preparation method is:

(1) Mix the nano-titanium dioxide stock solution and the nano-silver solution evenly.

(2) Mix uniform nano-titanium dioxide/nano-silver mixture, film-forming aids, leveling agents, dispersants, wetting and dispersing agents, defoamers, water, titanium dioxide, ultrafine aluminum silicate, talcum powder, Lithopone, heavy calcium carbonate, and light calcium carbonate were weighed respectively and added to the mixing tank, stirred evenly, the speed was controlled at 1000r/min, and stirred for 30min to obtain a slurry;

(3) Grinding the above slurry with a sand mill or a three-roll mill to a fineness of ≤50 μm.

(4) Add the vinegar-acrylic emulsion to the above slurry, add a thickener to the storm and the temperature is 99K, and the product can be obtained.

Embodiment four:

The preparation formula of this embodiment is:

Tap water: 100 kg; Dispersant: 8 kg;

Defoamer: 4 kg; Thickener: 15 kg;

Leveling agent: 10 kg: Coalescing agent: 9 kg;

Wetting and dispersing agent 0.5 kg Pure acrylic emulsion: 400 kg

Ultrafine aluminum silicate: 20 kg; Titanium dioxide: 300 kg;

Talc powder: 50 kg; wollastonite: 50 kg

Nano silver solution: 20 kg; Nano titanium dioxide dispersion: 40 kg.

Its preparation method is:

(1) Mix the nano-titanium dioxide stock solution and the nano-silver solution evenly.

(2) Mix uniform nano-titanium dioxide/nano-silver mixture, film-forming aids, leveling agents, dispersants, wetting and dispersing agents, defoamers, water, titanium dioxide, ultrafine aluminum silicate, talcum powder, Weigh the wollastonite respectively and add to the mixing tank, stir evenly, control the speed at 1200r/min, and stir for 30min to obtain the slurry;

(3) Grinding the above slurry with a sand mill or a three-roll mill to a fineness of ≤40 μm.

(4) Add pure acrylic emulsion to the above slurry, add a thickener until the Stormer viscosity is 110K, and the product can be obtained.

Claims (6)

1. nano titanium oxide/nanometer silver coating is characterized in that this coating includes nano titanium oxide and nanometer money kind nanoparticle, and each component and weight proportion are:

Water: 50-300 kilogram; Dispersion agent: 5-12 kilogram;

Wetting dispersing agent: 0.1-1 kilogram; Defoamer: 1-5 kilogram;

Thickening material: 1-15 kilogram; Film coalescence aid: 5-15 kilogram;

Flow agent: 1-15 kilogram; Nano titanium oxide dispersion: 10-100 kilogram;

Nano silver solution: 10-100 kilogram; Titanium dioxide: 30-400 kilogram;

Superfine alumina silicate: 10-50 kilogram; Zinc sulfide white; The 0-150 kilogram;

Light calcium carbonate: 0-250 kilogram; Water-ground limestone: 0-150 kilogram;

Talcum powder: 0-100 kilogram; Wollastonite powder: 0-150 kilogram;

Base-material: 100-500 kilogram;

Described base-material is any one or its mixture arbitrarily in pure third, phenylpropyl alcohol, vinegar third, the organosilicon crylic acid latex.

2. nano titanium oxide according to claim 1/nanometer silver coating is characterized in that: described nano titanium oxide is rutile-type, anatase titanium dioxide, plate titanium type.

3, nano titanium oxide according to claim 1/nanometer silver coating is characterized in that: described nano titanium oxide is a mixed crystal type and armorphous.

4. nano titanium oxide according to claim 1/nanometer silver coating is characterized in that: the nano-titania particle diameter range is 1-100nm, and the particle diameter of nanometer silver is 1-200nm.

5. the preparation method of nano titanium oxide as claimed in claim 1/nanometer silver coating is characterized in that the coating preparation process is:

(1) nano titanium oxide dispersion and Nano silver solution are mixed, form nano titanium oxide/nanometer silver mixed solution:

(2) above-mentioned nano titanium oxide/nanometer silver mixed solution, film coalescence aid, Ricinate, dispersion agent, flow agent, defoamer, water, titanium dioxide, zinc sulfide white, superfine alumina silicate, talcum powder, wollastonite, light calcium carbonate and water-ground limestone are added agitation vat after the weighing respectively, mix and stir, obtain slurry;

(3) above-mentioned slurry is ground to fineness≤60 μ m through sand mill or three-roller;

(4) base-material is joined in the above-mentioned slurry, add thickening material, can obtain product to Si Tuomo viscosity 90-110K.

6. the preparation method of nano titanium oxide according to claim 5/nanometer silver coating, when it is characterized in that preparing slurry, during with nano titanium oxide/nanometer silver mixed solution, dispersion agent, Ricinate, film coalescence aid, flow agent, defoamer, water, titanium dioxide, zinc sulfide white, superfine alumina silicate, talcum powder, wollastonite, light calcium carbonate, water-ground limestone mixing stirring, rotating speed is controlled at 1000～2000rmin ^-1, churning time is 20-60min.