KR20090007840A

KR20090007840A - Paints and manufacture method of paints eco-friendly

Info

Publication number: KR20090007840A
Application number: KR1020070070997A
Authority: KR
Inventors: 한삼화
Original assignee: 주식회사 삼한 씨원
Priority date: 2007-07-16
Filing date: 2007-07-16
Publication date: 2009-01-21

Abstract

Eco-friendly paints are provided to show purification ability (antibacteria, sterilization, and the decomposition of organic contaminant) due to excellent reduction property of NOx concentration. A method of manufacturing eco-friendly paints comprises (S1) a step for pulverizing titanium dioxide and non-metallic material, mixing the titanium dioxide powder and the non-metallic material powder 3-10 weight% based on the weight of titanium dioxide, mixing water 50 weight% based on the weight of titanium dioxide with the mixture, plasticizing the synthesized material at 550 °C for 4 hours and pulverizing the plasticized material at a room temperature to obtain the synthesized photo-catalyst; (S2) a step for substituting the synthesized photo-catalyst 10-50 weight% based on the weight of clay, dry-mixing it, and mixing the dried material with water 50 weight% based on the weight of clay to obtain the product; (S3) a step for plasticizing the product at 550 °C for 4 hours to obtain an optical catalyst carrier; and (S4) a step for mixing water, a binder material and an inorganic waterproof agent to obtain paints.

Description

Paints and manufacture method of paints Eco-friendly}

The present invention relates to a method for manufacturing an environmentally friendly paint and its paint. To be more specific, it is necessary to purify air pollution, antibacterial, sterilization, decomposition of organic pollutants, deodorization, deodorization, and antifouling by using a photocatalyst carrier using clay. It is to be able to provide a paint that is applicable to the field and excellent coating workability.

With the current economic development, the level of consciousness of modern people expects a safer and cleaner environment, but the air we breathe and breathe in every day is not very clean. This is mainly due to industrial activities through economic development and air pollution caused by rapidly increasing exhaust gas from vehicles. In particular, nitrogen oxide (hereinafter referred to as 'NOx'), which accounts for about 30% of the pollutants emitted to the atmosphere, is well known as a gas component that causes pollution in large cities or factory areas. The presence of about 50 ppm is known to cause death of the living body, and even at low concentrations between 0.05 and 0.2 ppm causes respiratory failure. Moreover, even at low concentrations in the atmosphere, photochemical reactions, along with water and hydrocarbons, are better known to cause smog, one of the most serious problems in large cities. Most of the NOx is present in the exhaust gas of high temperature because NO is in a relatively stable state at high temperature. However, at room temperature, it is easily oxidized to NO ₂ , which is a direct cause of pollution.

As a result of this problem, many proposals and regulations have been proposed and adopted, and a lot of research on air pollution prevention technology at the source itself has been conducted, but there are limitations on the technology of reducing air pollutants at the source. In particular, a lot of air pollutants by vehicles are discharged to the atmosphere.

On the other hand, indoors generate volatile organic compounds (hereinafter referred to as 'VOCs') due to the use of silicon and various building materials, and especially formaldehyde (hereinafter referred to as 'HCHO') is emitted from construction materials. It has a significant amount of chemicals and is known to be a carcinogen, and its seriousness is emerging. In recent years, the damage caused by VOCs, such as head sickness, eye pain, and dizziness, has been continuously reported after moving to a new house called “Sick House Syndrome.” Especially, the damage is increasing to targets with low immunity such as young children or the elderly.

Therefore, we developed coating materials with self-purification function using TiO ₂ Sol and high activity TiO ₂ Sol that are applicable to transparent materials and use them in glass, tile, plastic, metal, etc. To get rid of and clean up the air. On the other hand, by coating a photocatalytic material on the interior and exterior materials of residential buildings and hospitals, it aims to obtain antibacterial, deodorant and pollution prevention effects.

Next, the photocatalyst in the present invention refers to a material that absorbs light and causes various chemical reactions. Examples of the photocatalyst include titanium dioxide (TiO ₂ ) and ruthenium trispyridyl (Ru 2+), and zinc oxide ( Photocatalysts such as ZnO) and cadmium sulfide (CdS), and the reaction principle of the photocatalyst is that, when subjected to ultraviolet rays such as sunlight or fluorescent lamps, electrons with holes and holes with + electricity are formed, as in the principle of solar cells. In particular, since holes have stronger oxidizing power than chlorine or ozone chlorine for sterilization, they not only decompose various organic substances but also have an excellent effect of removing nitrogen oxides (NO _X ) and sulfur oxides (SO _X ).

Therefore, photocatalysts are widely used in places where air and water pollution purification, antibacterial, sterilization, and deodorization of organic pollutants are required. Currently, among various photocatalysts, titanium dioxide which is active using ultraviolet light and does not have photocorrosion is mainly used. The reason is that the titanium dioxide photocatalyst is an n-type semiconductor, and when ultraviolet rays (400 nm) are received, electrons and electron holes are formed to oxidize and decompose the organic compound to oxidize water (H 2 O) and carbon dioxide gas. This is due to the generation of hydroxy hydroxy radicals (-OH) and super oxides (O2-), which act as transformations to (CO2).

The clay so-called clay minerals presented in the present invention are divided into gibbsite group, kaolin group, smectite group, illite, chlorite, and mixed stone clay according to crystal structure and properties, and are rich in aluminum and are hydrated silicate ( hydrous aluminosilicates). Clay minerals can be characterized in many ways, but the typical one is that it shows the tendency of plasticity when mixed with an appropriate amount of water, and the layer structure of the crystal structure. Due to the crystal structure, the crystalline form of the coronal to the leaf and various unique physicochemical properties are induced.

Clay minerals also show the highest cation exchange capacity after zeolites in relation to their stratified structural features, especially vermiculite and mommorillontite. Clay minerals also have hydration and organic adsorption properties.

However, since the coating material of the background art is applied to an article requiring a self-cleaning function, even if the coating material is coated on an article or glass provided in the room to purify the indoor air, its purification ability is weak. Titanium dioxide reacts only on the surface, resulting in a slow reaction rate and poor adsorption, resulting in a deterioration of the purification function, and a reaction product remaining on the surface. In addition, there was a problem that does not react without light.

In addition, photocatalytic titanium dioxide, which is widely used at present, reacts only on the surface, so that the reaction rate is slow and the adsorption property is low. Therefore, the effect of air and water pollution purification, antibacterial, sterilization, and decomposition deodorization of organic pollutants cannot be expected. Due to the bond disappearing by the construction, there is a slow release (성 性), and the reaction product remains on the surface, causing a long-term deterioration of the degradation rate of the pollutant gradually decreases, and without light does not react In addition, although a carrier using a photocatalyst has been proposed, the carrier has a high photocatalyst loss rate due to lack of hydration, adhesiveness, and adsorption properties, and thus, the photocatalyst has a high photocatalyst loss rate. There was a problem that can not be obtained.

The present invention was invented to solve the problems of the coating material and the photocatalytic material as described above at the same time, in the present invention, the photocatalyst and the hydration, adhesion, adsorption, etc. that can cause a photoreaction even under a light-inactive light source By using clay which reduces the loss rate of photocatalyst having the characteristics of, it is intended to propose an eco-friendly paint that maximizes the photocatalytic function (purification function) and has excellent coating workability while using a very wide range.

The solution of the present invention is to prepare a paint using a photocatalyst having a unique color and clay harmless to the human body by applying the building material constituting the interior of the building and the interior wall of the building and the interior material constituting it to purify the air itself It is to be able to impart a function, and in particular, the material of the paint is to use an inorganic paint that does not harm the human body.

That is, a non-metallic substance sulfur, clay, and water are mixed with titanium dioxide at a predetermined ratio, and then calcined at a specific time and temperature, followed by air cooling at room temperature to obtain a photocatalyst carrier and then grafting it to an inorganic paint and a bind material to prepare a paint. Although carbon and nitrogen can be mixed in place of non-metallic sulfur from above, sulfur is an electrical defect conductor and charged by friction and chemically similar to oxygen, which is quite active and powdered in air at room temperature. It is oxidized, and is directly compounded with a metal, has a characteristic of being white and high in colorability, chemically stable and harmless, and thus the applicant of the present application has determined that sulfur is suitable for the present invention.

Manufacturing method for achieving this,

Process of powdering titanium dioxide and sulfur of non-metallic substance with purity of 99.9%, drying and drying sulfur powder by replacing 3% to 10% by weight of titanium dioxide powder and mixing 50% by weight of water with titanium dioxide powder by weight And a step of obtaining a compound by stirring, sintering the compound in a container that is not damaged at high temperature, calcining at a temperature of 550 ° C. for 4 hours in which the properties of the compound do not change completely, and then air-cooling at room temperature to obtain a synthetic photocatalyst. .

10 to 50% by weight of the synthetic photocatalyst obtained in the first step was replaced by 10% by weight to 50% by weight of clay, followed by drying and mixing, followed by mixing and stirring 50% by weight of water to clay weight to obtain a product.

The product of the second step is placed in a container which is not damaged at high temperature (ultimately porcelain series), fired at a temperature of 550 ° C. for 4 hours in which the traits of the product do not change completely, and then cooled by air cooling at room temperature to obtain a photocatalyst carrier.

After adding water, a binder material, and an inorganic waterproofing agent to the photocatalyst carrier of the third step, the mixture is stirred so that there is no aggregation phenomenon between the particles, but water is 90 wt% to 180 wt% based on 100 wt% of the photocatalyst carrier, The binder material is 10% to 50% by weight based on 100% by weight of the photocatalyst carrier, and the inorganic waterproofing agent is 10% by weight to 50% by weight relative to 100% by weight of the photocatalyst carrier, and the optimal composition ratio is 100% of the photocatalyst carrier. 120% by weight, the binder material is 20% by weight 100% by weight of the photocatalyst carrier, the inorganic waterproofing agent is 20% by weight 100% by weight of the photocatalyst carrier, which is different from the composition ratio of the photocatalyst carrier, water, binder material, inorganic waterproofing agent Although it is derived from the results of evaluating the condition of the various paints prepared, the optimum composition ratio of the compositions may vary according to temperature, humidity, and working conditions.

On the other hand, the binder material is a silicate emulsion of a natural inorganic adhesive, potassium silicate, sodium calpoxy, albumin, sodium silicate, potassium silicate solution in a good surface state, does not generate bubbles and has a small surface projection is preferred.

The present invention synthesis hayeoteumeuro a photocatalyst and a clay composition due to the composite photocatalyst (including visible light) of each light source a variety of hazardous substances, while serious air pollution under, as well as dark conditions has excellent density reduction of NO _X is also because the density reduction of NO _X in the It can exhibit purification ability (antibacterial, sterilization, decomposition of organic pollutants, etc.) in indoors where light activity is low, and maximizes photocatalytic function, and it is a clay with characteristics such as plasticity, layer structure, hydration, and adsorption property. Due to this, it is possible to manufacture a paint having a low loss rate of the photocatalyst, so that the paint can perform more than the role of a general paint. It works.

Therefore, when the present invention is applied indoors (inner walls, etc.), it is possible to adsorb / remove pollutants VOCs and HCHO by photocatalysts reacting with light of sunlight and fluorescent lamps, thereby improving life comfort and environment for the whole life. When the present invention is applied to the exterior wall of the building, it is possible to purify the atmosphere by sunlight.

Paint purification performance, coating workability in the effect of the present invention as described above can be seen through the following examples.

First, the example about the purification performance of paint,

The paint of the present invention was horizontally brushed onto a beam plate of 30 cm × 30 cm and then repainted in a vertical direction to maintain a temperature of 21 ° C. for 36 hours to evaluate the purifying performance. Under the UV lamp and fluorescent light source, the concentration decrease of nitrogen oxide (NO _X ), formaldehyde (HCHO), acetaldehyde (CH ₃ CHO) and toluene (C ₇ H ₈ ) gas was measured, and the above closed test equipment was used. The initial concentration of each noxious gas was 2.0 ppm, and acetaldehyde was 50 ppm.

The paint of the present invention, which is a sample used in the following examples, was expressed as clay / TiO ₂ / S powder, and the substitution rate of the synthetic photocatalyst was expressed as wt10% and wt50%.

As shown in the figure and table below, when the NOx gas concentration decrease rate of the present invention under UV lamp and fluorescent light source, wt.10% of the UV lamp showed a concentration reduction rate of 100% at the beginning of the experiment and wt.50% Was reduced to 100% at 9 hours after the start of the experiment. 10% showed a decrease of 100% at 27 hours after the start of the experiment. 50% showed a concentration decrease of 100% at the beginning of the experiment.

In other words, the paint of the present invention, in which the synthetic photocatalyst was added to the clay, was superior to the UV lamp under the fluorescent lamp light source in the relative removal performance of the NOx gas under the UV lamp and the fluorescent lamp light source.

As shown in the figure and table below, the concentration reduction rate of HCHO gas in the paint of the present invention under UV lamp and fluorescent light source was 100% wt. % Showed an attenuation reduction of 100% at 5 hours after the start of the experiment. 10% showed a decrease in concentration of 100% at the beginning of the experiment. 50% showed a concentration decrease of 100% at the beginning of the experiment.

In other words, the paint of the present invention having a synthetic photocatalyst added to clay exhibited better UV lamps than those under fluorescent light sources in the relative removal performance of HCHO gas under UV lamps and fluorescent light sources.

As shown in the figure and table below, the concentration reduction rate of CH ₃ CHO gas in the paint of the present invention under UV lamp and fluorescent light source showed that the wt.10% concentration loss rate was 36.66% at the beginning of 24 hours. .50% showed an attenuation reduction of 100% at 11 hours after the start of the experiment. 10% showed a decrease of 30.34% at 24 hours after the start of the experiment. 50% showed a concentration reduction of 100% at the beginning of the experiment.

In other words, the paint of the present invention, in which a synthetic photocatalyst was added to clay, had a better UV lamp than a fluorescent light source in the relative removal performance of CH ₃ CHO gas under a UV lamp and a fluorescent light source.

As shown in the figure and table below, the concentration reduction rate of C ₇ H ₈ gas in the paint of the present invention under UV lamp and fluorescent light source showed that the wt. wt.50% showed a reduction of 100% at 5 hours after the start of the experiment. 10% showed a decrease of 30.34% at 20 hours. 50% showed a concentration reduction rate of 100% at the beginning of the experiment.

In other words, the paint of the present invention, in which the synthetic photocatalyst was added to the clay, was superior to that of the fluorescent lamp light source in the relative removal performance of the C ₇ H ₈ gas under the UV lamp and fluorescent light source.

Next, an embodiment of the workability of the present invention,

The test method for brush workability is a test method according to KS M 2411. The surface is evenly spread in the vertical direction until the surface is covered with a paint uniformly mixed with cold rolled steel plates (60cm × 60cm) wiped with a solvent. 5cm) was used for painting and then painted in the horizontal direction again. At this time, it was evaluated whether the brush was attracted or easy to work, and the board was dried in a vertical direction, and then the streaking, flooding, brush marks, and gloss on the coating film were evaluated, and the flow and spreadability were evaluated. There was no brush attraction due to powder agglomeration and no streaking or brush marks during drying. In addition, there was no flooding phenomenon in which the pigment floated completely on the surface to form the color of the pigment itself, and the floating phenomenon in which color separation occurred during drying did not occur.

Spray workability test is a test method according to KS M 2412. Paint is sprayed on steel plate (10cm × 30cm), which is well wiped with solvent, and the spray gun is kept at a distance of 20-25cm from the spray gun to the steel plate. And sprayed while moving parallel to the surface. The painted plate was placed almost vertically to evaluate the segging phenomenon, and after drying, dusting, spot color stains, bubbling, wrinkles, streaking, pinholes, creering, whitening, and silking were evaluated. Although the thickness is uneven, the sagging phenomenon of semicircle shape, icicle, etc., the pinhole phenomenon of small holes in the coating film, and the crinkling (wrinkling) phenomenon of unbreakable wave shape in the coating film are occurred. No smearing, streaking, sealing, or cruttering occurred, and spray workability was excellent.

As described above, the concentration of nitrogen oxides, formaldehyde, acetaldehyde, and toluene gas in the synthetic photocatalyst, which is the main raw material of the paint prepared according to the present invention, under each light source was changed according to the substitution rate of the synthetic photocatalyst. In addition, it can be seen that as well as exhibits the purification performance even at low wavelengths, such as fluorescent lamps, and furthermore, the embodiment of the synthetic photocatalyst shows that the purification performance under dark conditions.

The results of the above examples are supported by the same examples of photocatalyst carriers below.

After stirring / mixing 50% by weight of water with 5% by weight of the photocatalyst, it is applied to a beam plate of 30Cm × 30Cm and dried to produce a specimen. The specimen is installed with a UV lamp or a fluorescent lamp and a noxious gas of 2.0 ppm is produced. in state _X is put that provide a closed test carried cases and light source done measuring the concentration of NO _X reduction amount for each composite photocatalyst and a degree of substitution of clay was mounted in the apparatus to measure the concentration of NO _X reduction.

In the examples below, the photocatalyst carrier was expressed as 'clay-TiO ₂ / S', and the synthetic photocatalyst substitution rate was expressed as wt10% to wt50%.

The figure and table below show the results of NOx (nitrogen oxide) gas removal performance test according to the synthetic photocatalyst substitution rate of clay-TiO ₂ / S under UV lamp light source. The reduction rate of NOx according to the substitution rate of the synthetic photocatalyst is shown in the table below. The synthetic photocatalyst substitution rates of 10%, 20%, 30%, 40%, and 50% are 11.5%, 15%, and 20% at the start of the experiment, respectively. The concentration reduction rate of%, 21,5%, 26.5% is shown, and the concentration reduction rate of 25%, 31.5%, 41.5%, 45%, and 50% is shown at 2 hours of the experiment. And 10%, 20%, 30%, 40%, 50% takes 10, 9, 8, 7, 6 hours after the start of the experiment, respectively.

Based on the above experimental results, it can be seen that the removal performance of NOx gas according to the substitution rate of the synthetic photocatalyst under UV lamp light source was excellent in the order of 50%> 40%> 30%> 20%> 10%.

The figure and table below show the NOx concentration reduction result according to the NOx removal performance according to the synthetic photocatalyst substitution rate of clay-TiO ₂ / S under fluorescent light source.

The reduction rate of NOx according to the substitution rate of the synthetic photocatalyst is shown in Table 3-21. The synthetic photocatalyst substitution rate of 10%, 20%, 30%, 40%, 50% is 8.5%, 15% 16.5%, 21.5%, 23.5%, 36.5%, 51.5%, 56.5%, 66.5%, 71,5% at 5 hours of test start, 58.5%, 71.5%, 77.5%, 88.5%, 97.5 at 10 hours of test % Is indicated. In addition, 10%, 20%, 30%, 40%, and 50% took 23.20, 18, 15, and 21 hours after the start of the experiment, respectively.

Although the activity is lower than that under the UV lamp light source, the experimental results show that the NOx gas removal performance under the fluorescent light source is 50%> 40%> 30%> 20%> 10%. It can be seen that excellent.

The figure and table below show the adsorption performance of each harmful gas in the test apparatus as the concentration reduction rate after placing the specimen in the closed test apparatus under the dark condition and adding NOx gas. The concentration decrease was about 3.0-4.5% for 24 hours under the dark condition.

Claims

Process to powder non-metallic material with titanium dioxide and purity 99.9%, dry non-metallic material by replacing 3 to 10% by weight with respect to titanium dioxide powder by weight and mixing 50% by weight of water with titanium dioxide powder by weight A first step of obtaining a synthetic photocatalyst by a step of obtaining a compound by stirring and calcining the compound at a temperature of 550 ° C. for 4 hours and then air-cooling at room temperature for fine powdering;

A second step of obtaining a product by mixing and agitating the synthetic photocatalyst obtained in the first step by mixing 10 wt% to 50 wt% of clay to clay and then mixing and stirring 50 wt% of water by weight of clay;

A third step of obtaining the photocatalyst carrier by calcining the product of the second step at a temperature of 550 ° C. for 4 hours and then air-cooling at room temperature for fine powdering;

The paint is prepared by adding and stirring water, a binder material, and an inorganic waterproofing agent to the photocatalyst carrier of the third step, wherein water is 90% to 180% by weight relative to 100% by weight of the photocatalyst carrier, and binder material is 100% by weight of the photocatalyst carrier. 10 wt% to 50 wt%, the inorganic waterproofing agent is an environmentally friendly paint production method, characterized in that 10% to 50% by weight relative to 100% by weight of the photocatalyst carrier.

The composition ratio of claim 1, wherein the composition ratio of the photocatalyst carrier, water, binder material, and inorganic waterproofing agent is 120% by weight based on 100% by weight of the photocatalyst carrier, the binder material is 20% by weight, based on 100% by weight of the photocatalyst carrier, and the inorganic waterproofing agent is 100% of the photocatalyst carrier. Eco-friendly paint manufacturing method characterized in that the weight 20% by weight

The method of claim 1, wherein the binder material is a silicate emulsion type.

The method of claim 1, wherein the non-metallic material is sulfur.

Eco-friendly paint characterized by being composed of titanium dioxide, sulfur, clay, silicate emulsion type binder material, water and inorganic waterproofing agent.