KR20090114497A - Bamboo activated carbon paint - Google Patents

Abstract

PURPOSE: A bamboo activated carbon paint is provided to deodorize a volatile organic compound harmful to the human body, to ensure excellent antibacterial property, anti-mold property, and sterilization effect because silver is not easily washed away. CONSTITUTION: A bamboo activated carbon paint comprises bamboo activated carbon 100 parts by weight, silver salt 0.01-3 parts by weight, organic resin binder 20-100 parts by weight, thickener 0.5-5 parts by weight, and dispersant 3-20 parts by weight. The organic resin binder includes at least one selected from an acrylic resin, acryl/styrene copolymer resin, vinylacetate/ethylene copolymer, polyvinylacetate or vinylacetate polymer. The thickener includes at least one selected from methyl cellulose, carboxymethyl cellulose, hydroxyethyl methyl cellulose or hydroxypropyl methyl cellulose.

Description

Bamboo activated carbon paint}

The present invention relates to a bamboo activated carbon paint containing bamboo activated carbon, an organic resin binder, a thickener, a dispersant, and a silver salt, which is capable of deodorizing harmful volatile organic compounds, and is characterized by excellent antibacterial and antifungal properties.

Recently, many new chemicals used by tenants to build new homes have increased social interest in the new home syndrome, which causes headaches and allergies, and the Ministry of Environment's "Indoor Air Quality Control Act" As it became effective (2004.05.30), indoor air quality management of multi-use facilities used by the general public with more than a certain scale, such as bathhouses, PC rooms, recreation rooms, libraries and rest rooms, has been strengthened.

Especially in new apartment buildings, the amount of emission of six volatile organic compounds including formaldehyde should be measured and notified to the residents.

Building finishing materials such as natural coatings, antimicrobial agents and photocatalysts that can improve the indoor air of apartments and remove harmful substances are becoming very popular due to new house syndrome, increasing demand for well-being products and enactment of related laws.

As a related art in this regard, Japanese Patent Laid-Open Patent No. 11-29742. 1999] designed a paint containing 1 to 50% of powdered charcoal in a polyamide resin (nylon resin) paint. Charcoal absorbs cations in the air, increasing the anion concentration. Formalin-containing synthetic rubber-based adhesive is used. As a result of the adsorption test, the initial concentration was 6ppm, but after 12 hours, it decreased to 0.1ppm.

In the invention invention functional coating [Registration No. 10-0358326, 2002] was prepared a paint containing 30 to 60% by weight of fine powder charcoal, 30 to 70% by weight of liquid binder, pigment 10 to 40% by weight. This paint has the function of controlling the humidity and absorbing electromagnetic waves with far infrared radiation function and negative ion emission function.

In the paint additive composition [Reg. No. 10-0625688, 2006] containing the Korean invention patent charcoal powder as a main component, 60 to 90% by weight of charcoal powder, 5 to 20% by weight of sepiolite powder, and 5 to 20% by weight of silica powder were mixed. It is to prepare a paint additive composition. At the time of use, a method of mixing them with commercial paints or cement mortar is adopted. They were found to be excellent in absorbent, deodorant, bactericidal, anion and far infrared emission effects.

In the functional paint [Reg. No. 10-0626176, 2006] prepared using the nano-silver and charcoal of the present invention, a nano silver aqueous solution of 150 nm to 250 nm is added to a 30% acrylic emulsion binder and a 30% polyvinyl butyral mixed aqueous solution. And anionic stones were added to prepare a functional paint. This paint has excellent deodorizing and sterilizing power and can be used for the purpose of emitting anion and far infrared rays.

Korea Invention Patent Building Finishing Material [Registration No. 10-0732435, 2007] is used for building finishing materials that use papaya oil and palm sap or 20 ~ 40% of powdery oak charcoal, jade, ocher, zeolite and germanium. It is about.

As described above, the production of paint mainly using charcoal and the use of activated carbon are related to the method of manufacturing a paint mainly containing palm activated carbon and silver ionized water. However, silver is present in the form of colloidal silver in the range of 1 nm to 100 nm, and the activated carbon used is palm activated carbon. Palm activated carbon is activated carbon having a fine pore structure of 20Å or less, and the manufacturing process is also the first process of mixing PVAc and PVA in silver ionized water to produce a resin solution having a high viscosity and mixing it with activated carbon. It is attached only to the surface.

Bamboo activated carbon has a large specific surface area of 1,000 m 2 / g or more, so its adsorption characteristics are high, and thus it is widely used for water treatment and gas separation. In particular, bamboo activated carbon has a well developed medium pore in the range of 20 ~ 500Å [Chemical Engineering, 43 (1), 146-152 (2005)]. It shows the characteristics that are maintained firmly.

The present invention relates to bamboo activated carbon paint, and more particularly, in the conventional water-soluble paint, by adding bamboo activated carbon and silver salt aqueous solution to deodorize volatile organic compounds harmful to the human body, and excellent antibacterial and mold resistance paint for building interior finishing materials It is about. In particular, an aqueous solution of silver nitrate prepared by dissolving silver nitrate or metallic silver in nitric acid is prepared, and then, bamboo activated carbon is mixed with silver impregnated bamboo activated carbon in the middle pores of the bamboo activated carbon. As the pores are not completely blocked and the silver penetrates into the pores, the silver is not easily lost and is firmly maintained, thus producing a bamboo activated carbon paint having a silver content of 0.001% or more having a long-term sterilization effect.

The present invention for achieving the above-mentioned object is a water-soluble paint for indoor buildings containing bamboo activated carbon, silver salt in the water-soluble paint.

Bamboo activated carbon paint of the present invention contains 20 to 100 parts by weight of organic resin binder, 0.5 to 5 parts by weight of thickener, 3 to 20 parts by weight of dispersant, and 0.01 to 3 parts by weight of silver salt based on 100 parts by weight of bamboo activated carbon.

Bamboo activated carbon in the present invention is 200-500 mesh, preferably using 300-350 mesh of activated carbon is good in dispersibility and excellent usability and workability of the paint. Bamboo activated carbon has the advantage of having long-term sterilization effect because the pores are not completely blocked when the organic binder is added, and the silver penetrates into the pores because silver is not easily lost.

The organic resin binder contains 20-100 parts by weight, more preferably 40-60 parts by weight based on 100 parts by weight of bamboo activated carbon, and is used to make the paint adhere to the surface of the building finish.

The organic resin binder may be used as long as the paint can adhere well to the surface of the building material and prevent bamboo activated carbon from coming out. As an example of the organic resin binder, any one or two or more selected from acrylic resin, acrylic / styrene copolymer resin, vinyl acetate / ethylene copolymer, polyvinylacetate or vinyl acetate polymer may be used.

The thickener is used to impart viscosity to the paint and to improve the coatability of the paint. As an example of the thickener, any one or two or more selected from methyl cellulose, carboxymethyl cellulose, hydroxyethyl methyl cellulose, or hydroxypropyl methyl cellulose may be used.

The dispersant contains 3-20 parts by weight, more preferably 3-10 parts by weight based on 100 parts by weight of bamboo activated carbon, and is used to evenly disperse the bamboo activated carbon powder in the components constituting the paint. As long as the dispersibility of the bamboo activated carbon powder can be improved in the present invention, any one can be used. As an example of the dispersant, any one or two or more selected from bentonite, natural zeolite, sodium metasilicate, diatomaceous earth, perlite, calcium silicate or magnesium silicate may be used.

The silver salt is more preferably 0.01-2 parts by weight based on 100 parts by weight of bamboo activated carbon.

The silver salt refers to a salt prepared by dissolving silver nitrate (AgNO ₃ ) or metal silver (Ag) in nitric acid (HNO ₃ ). Here, the silver salt can be used in the form of silver salt aqueous solution, the silver salt aqueous solution is contained 100-400 parts by weight, more preferably 100-300 parts by weight based on 100 parts by weight of bamboo activated carbon and has a strong bactericidal and antibacterial effect. In terms of the function of silver, the dissociation of silver ions, which have strong oxidizing power, kills them by suffocating by stopping the function of enzymes necessary for viruses, bacteria, fungi, and fungi to breathe. The electrical load of silver suppresses germ reproductive function.

Bamboo activated carbon paint according to the present invention is capable of deodorizing volatile organic compounds harmful to the human body, and is a paint for building interior finishing materials having excellent antibacterial and antifungal properties by adding a silver salt aqueous solution. When the organic binder is added, pores are not completely blocked and silver penetrates into the pores, so silver is not easily lost and is firmly maintained, thereby having a long-term sterilizing effect.

Hereinafter, the content of the present invention will be described in detail through examples and test examples. However, these are intended to illustrate the present invention in more detail, and the scope of the present invention is not limited thereto.

Preparation Example 1 Manufacture of Bamboo Activated Carbon Powder

Bamboo is put into a carbonization furnace for making bamboo charcoal, and then heated to a degree where the bamboo is completely carbonized at a high temperature of 800 ° C. to obtain bamboo charcoal, which is then activated at a high temperature of 800 ° C. to 1000 ° C. while supplying steam to make bamboo activated carbon. The bamboo activated carbon was pulverized with a crusher to prepare 320 ± 5 mesh bamboo activated carbon powder.

Preparation Example 2 Manufacture of Bamboo Charcoal Powder

Bamboo was put in a carbonization furnace for producing bamboo charcoal, and then heated to a degree where the bamboo was completely carbonized at a high temperature of 800 ° C. to obtain bamboo charcoal, which was crushed by a crusher to prepare a bamboo charcoal powder having 320 ± 5 mesh.

Preparation Example 3 Manufacture of Palm Activated Carbon Powder

All of the same as in Preparation Example 1, but using a coconut shell instead of bamboo is the difference.

Example 1

0.3 g of silver nitrate was added to a 2 L beaker with a stirrer, and 150 g of water was stirred. After dissolution was completed, 100 g of 320 ± 5 mesh powder bamboo activated carbon obtained in Preparation Example 1 was slowly added. At this time, the activated carbon powder particles are sufficiently stirred to completely sink in water. Add 50 g of acrylic resin (Sewon Chemical, average molecular weight 150,000), stir well, add 5 g of sodium metasilicate again, stir sufficiently, add 5 g of methyl cellulose (Aldrich, average molecular weight 30,000), and stir again. In order to adjust the viscosity as a whole, 2g of a dispersant is added, followed by stirring for 30 minutes or more.

Example 2

50 g of nitric acid diluted 1: 1 with water is added to a 2 L beaker with a stirrer, and 0.2 g of metal silver is added. After dissolution is completed, dilute with water to 150g total liquid. 100 g of powdered bamboo activated carbon of 320 ± 5 mesh obtained in Preparation Example 1 was slowly added. At this time, the activated carbon powder particles are sufficiently stirred to completely sink in water. Add 50 g of acrylic resin (Sewon Chemical, average molecular weight 150,000), stir well, add 5 g of sodium metasilicate, stir thoroughly, add 5 g of methyl cellulose (Aldrich, average molecular weight 30,000), and stir again. . In order to adjust the viscosity as a whole, 2g of a dispersant is added, followed by stirring for 30 minutes or more.

Comparative Example 1

All of the same as in Example 1, but the difference between using the bamboo charcoal powder obtained in Preparation Example 2 instead of the powder bamboo activated carbon.

Comparative Example 2

All of the same as in Example 1, but using the palm activated carbon powder obtained in Preparation Example 3 instead of the powder bamboo activated carbon is the difference.

Test Example 1 Deodorization Rate Measurement

 The bamboo activated carbon paint prepared in Example 1 was coated three times on the gypsum board cut to a size of 4 cm × 4 cm × 1 cm. The coated specimen was subjected to formaldehyde (HCHO) deodorization test by the test method of the Korea Institute of Construction Materials (KICM-FIR-1085).

<Table 1> Formaldehyde Deodorization Rate of Bamboo Activated Carbon Paint (Unit:%)

division Elapsed time (minutes) 0 min 30 minutes 60 minutes 90 minutes 120 minutes Blank concentration (ppm) 82 78 75 71 67 Example 1 Specimen Concentration (ppm) 82 13 9 6 4 Example 1 Deodorization Rate (%) - 83.3 88.0 91.5 94.0 Comparative Example 1 Deodorization Rate (%) - 56.4 57.3 58.3 60.0 Comparative Example 2 Deodorization Rate (%) - 70.2 78.0 81.3 88.1

 Therefore, the formaldehyde deodorization rate of the bamboo activated carbon paint (Example 1) 83.3 ~ compared to the formaldehyde deodorization rate of 56.4-60.0% of the conventional bamboo charcoal paint (Comparative Example 1), and 70.2-8.88% of the palm activated carbon paint (Comparative Example 2). It can be seen that the excellent properties are 94.0%.

Test Example 2 Far-Infrared Emission Measurement

The bamboo activated carbon paint prepared in Example 1 was coated three times on the gypsum board cut to a size of 4 cm × 4 cm × 1 cm. The coated specimens were measured for the far-infrared emissivity and the amount of far-infrared rays by the test method of the Korea Institute of Construction Materials (KICM-FIR-1005). Far-infrared emissivity was 0.914 (5 ~ 20㎛) and radiation energy was 3.69 × 10 ² (W / ㎡).

Test Example 3 Anion Measurement

The bamboo activated carbon paint prepared in Example 1 was coated three times on the gypsum board cut to a size of 30 cm × 30 cm × 1 cm. The coated specimens were subjected to anion measurement test by the test method of the Korea Institute of Construction Materials (KICM-FIR-1042).

Test Example 4 Antibacterial Test

The bamboo activated carbon paint prepared in Example 1 was coated three times on the gypsum board cut to a size of 5 cm × 5 cm × 1 cm. The coated specimen was tested by antimicrobial test method (KICM-FIR-1002) of the Korea Institute of Construction Materials, and the results are shown in Table 2 below. Test strains were Escherichia coli ATCC 25922 and Pseudomonas aeruginosa ATCC 15442.

<Table 2> Antimicrobial Test of Bamboo Activated Carbon Paint

Test Items Test result Test Methods Initial concentration (CFU / 40p) Concentration after 24 hours (CFU / 40p) Bacterial Reduction Rate (%) Antibacterial Test by Escherichia Coli Blank 428 2870 - KICM-FIR-1002 Example 1 428 One 99.8 Antibacterial test by Pseudomonas aeruginosa Blank 437 2960 - Example 1 437 One 99.8

As a result of the antibacterial test for E. coli and P. aeruginosa, the bactericidal rate was 99.8% after 24 hours.

Test Example 5 Mold Resistance Test

The bamboo activated carbon paint prepared in Example 1 was coated three times on the gypsum board cut to a size of 5 cm × 5 cm × 1 cm. The coated specimens were tested for mold resistance by the test method (ASTM G-21) of the Korea Institute of Construction Materials, and the results are shown in Table 3 below. Aspergillus niger ATCC 9642, Penicillium pinophilum ATCC 11797, Chaetomium globosum ATCC 6205, Gliosiadium virens ATCC 9645, and Aureobasidium pullulans ATCC 15233 were used as test strains.

Table 3 Antifungal Properties of Bamboo Activated Carbon Paint

Test Items Antifungal experiment Period of culture test 1 week later after 2 weeks 3 weeks later 4 weeks later Test result 0 0 0 0 Test Methods ASTM G-21

As shown here, it can be seen that the development of hyphae is not recognized until 4 weeks later.

Test Example 6 Antimicrobial Sustainability Experiment

After preparing Example 1, Comparative Examples 1 and 2, and coated on the specimen to make the specimen after one month, the antimicrobial test conducted in Test Example 4 was again performed.

<Table 4> Antimicrobial Sustainability of Bamboo Activated Carbon Paint

Test Items Test result Test Methods Initial concentration (CFU / 40p) Concentration after 24 hours (CFU / 40p) Bacterial Reduction Rate (%) Antibacterial Test by Escherichia Coli Blank 428 2870 - KICM-FIR-1002 Example 1 428 One 99.8 Comparative Example 1 428 79 81.5 Comparative Example 2 428 50 88.3 Antibacterial test by Pseudomonas aeruginosa Blank 437 2960 - Example 1 437 One 99.8 Comparative Example 1 437 48 89.0 Comparative Example 2 437 32 92.7

As a result of the antimicrobial persistence experiment, it can be seen that the sustainability of the bamboo activated carbon paint (Example 1) is superior to the bamboo charcoal paint and the palm activated carbon paint.

Claims (3)

Bamboo activated carbon, paint for building finishing materials containing 0.01-3 parts by weight of silver salt, 20-100 parts by weight of organic resin binder, 0.5-5 parts by weight of thickener and 3-20 parts by weight of dispersant. The method of claim 1, The organic resin binder is a paint for building finishing materials containing any one or more selected from acrylic resin, acrylic / styrene copolymer resin, vinyl acetate / ethylene copolymer, polyvinylacetate or vinyl acetate polymer The method of claim 2, The thickener contains at least one selected from methyl cellulose, carboxymethyl cellulose, hydroxyethyl methyl cellulose or hydroxypropyl methyl cellulose, and the dispersant is bentonite, natural zeolite, sodium metasilicate, diatomaceous earth, perlite, calcium silicate or magnesium Paint for building finishing materials containing at least one selected from silicates