KR102543803B1 - Eco-friendly biobased aqueous paint - Google Patents

Abstract

The present invention relates to an aqueous coating composition comprising 10 to 50% by weight of a bio-based aqueous acrylic emulsion resin, 1 to 10% by weight of a urea compound, and 0.1 to 5% by weight of a fluorine compound, wherein the bio-based aqueous acrylic emulsion resin is It relates to an aqueous paint composition characterized in that the carbon content is 20 to 40%. The water-based paint composition of the present invention can be used in various industrial fields as an eco-friendly paint with excellent stain resistance, formaldehyde adsorption performance, anti-fungal and antibacterial performance.

Description

Eco-friendly water-based bio-based paint {ECO-FRIENDLY BIOBASED AQUEOUS PAINT}

The present invention relates to an eco-friendly water-based paint composition for the interior of a building using a bio-based water-based acrylic emulsion resin.

Most conventional paints are generally manufactured using petroleum-based plastic materials. However, this is not desirable in the trend of the era of de-petroleum and low-carbon emissions. As a material to replace petrochemical plastics, bio-based resins based on biomass are being developed, and in the present invention, by developing eco-friendly water-based paints using such bio-based resins, for the purpose of reducing carbon emissions We would like to suggest a method for ESG management that

Since paints manufactured using bio-based resins developed so far have poor physical properties compared to resins using conventional petroleum compounds, it is difficult to apply them to paint systems by replacing existing resins.

On the other hand, formaldehyde is an oxygen-containing organic compound that has strong irritants and is easily soluble in water. Although formaldehyde is widely used in building materials, insulation materials for exterior and interior walls of buildings, indoor furniture and adhesives, formaldehyde is a group 1 carcinogen that is highly toxic to the human body and has recently emerged as a major cause of indoor air pollution.

Japanese Unexamined Patent Publication No. 2010-006930

An object of the present invention is to provide an aqueous coating composition that is environmentally friendly, has excellent antibacterial performance and antifungal function, is easy-cleanable, has excellent stain resistance, and has excellent formaldehyde adsorption performance.

Another object of the present invention is to provide a paint for interior use of a building comprising the above water-based paint composition.

In order to achieve the above object, the present invention,

An aqueous coating composition comprising 10 to 50% by weight of a bio-based aqueous acrylic emulsion resin, 1 to 10% by weight of a urea compound, and 0.1 to 5% by weight of a fluorine compound, wherein the bio-based aqueous acrylic emulsion resin has a bio-based carbon content of 20 to 40 It provides an aqueous coating composition characterized in that %.

In an embodiment of the present invention, the urea compound is urea, ethyleneurea, propyleneurea, 1,3-dimethyl-2-imidazolidinone, thiourea, N-methylurea, N,N'-epsilon-dimethylurea and Any one or more selected from the group consisting of 1,1,3,3-tetramethylurea can be preferably used.

The water-based paint composition has a bio-based carbon content of 20 to 30%.

The bio-based aqueous acrylic emulsion resin has a weight average molecular weight of 100,000 to 500,000 g/mol, a glass transition temperature (Tg) of -30°C to 30°C, and a solid content of 30 to 60% by weight.

The aqueous coating composition further includes at least one additive selected from the group consisting of a pigment, a thickener, a dispersing agent, an antifoaming agent, a pH adjusting agent, a preservative, a co-solvent and an emulsifier.

As the pigment, at least one selected from the group consisting of titanium dioxide, talc, and calcium carbonate may be used.

The water-based paint composition of the present invention has physical properties equal to or better than those of conventional petroleum-based paints even when bio-based resins are used, and has excellent antibacterial and antifungal functions, formaldehyde adsorption functions, and easy-cleaning properties. As an eco-friendly paint, it can be used as an eco-friendly interior paint for buildings.

The water-based paint composition of the present invention has physical properties equal to or higher than those of conventional paints using petroleum-based compounds, and satisfies the KS M 6010 water-based paint inner class 2 standard.

In addition, the water-based paint composition of the present invention exhibits antifungal and antibacterial properties, has a low paint odor and low VOC content, and satisfies the standards for building friendly houses.

In addition, the water-based paint composition of the present invention has an excellent ability to adsorb formaldehyde contained in building materials or wallpaper of recent buildings, and exhibits an effect of reducing volatile organic compounds present in the air harmful to the human body.

In addition, since the water-based paint composition of the present invention has an easy-cleaning property, it is not easily contaminated, and has strong resistance to contaminants when painting indoors, so that various possible occurrences may occur depending on the user's living environment. It is economical because contaminants are easily controlled.

Hereinafter, the present invention will be described in detail.

Although description of the constitutional requirements described below may be made based on typical embodiments of the present invention, the present invention is not limited to such embodiments.

The water-based paint composition of the present invention includes a bio-based water-based acrylic emulsion resin. The term of the present invention, "Bio-based" means containing a certain amount or more of raw materials derived from biomass. Biomass as used herein refers to carbon neutral materials or biodegradable resins. Biomass generally refers to plant resources, microbial metabolites, etc. in which carbon in the atmosphere is fixed by photosynthesis, and biodegradable plastic raw materials are also included as types of biomass. Biodegradable plastic raw materials include cellulose, pectin, chitin, PLA (Polylactic acid), PCL (Polycaprolactone), PEU (Polyesterurethane), AP (Alipahatic Polyester), Alo/Ali (Aromatic/Aliphatic copolyester), Bio-PDO (Propanediol), CA (Celluouse Acetate), PGA (Ployglycolicacid), PBS (Polybutylene succinate), PHB (Polyhydroxybutyrate), PVA (Polyvinylalcohol) TPS (Thermoplastic starch), PVA (Poly Vinyl Alcohol), PHA (Poly Hydroxy alkanoate), and the like. .

In general, the USDA minimum bio-based carbon content for ingredients and intermediates used in finished water-based or solvent-based paints and coatings products is 22%. A minimum bio-based carbon content of 20% is prescribed for interior paints and coatings applied to objects or surfaces as coloring liquids prepared for indoor use, which are applied to objects or surfaces when dried to form a film and provide protection.

The bio-based aqueous acrylic emulsion resin of the present invention may have a bio-based carbon content of 20% to 40%, preferably 20% to 30%. Bio-based carbon content is a method developed by ASTM International (formerly known as 'The American Society for Testing and Materials') to measure the bio-based/biogenic carbon content of gas, liquid and solid samples using radiocarbon dating techniques. It is a value measured by ASTM D6866, which is a standard test method. The test methodology calculates the ¹⁴ C ratio of CO ₂ in the combustion gas, corrects it, calculates bio-based carbon (BCF), and calculates the value obtained by subtracting bio-based carbon from total carbon (CF) as fossil-based carbon. ¹⁴ C has a half-life of about 5730 years and is a measurement method using the characteristic that it exists in bio-based carbon but does not exist in fossil-based carbon. Here, the value expressed as ^{the 14} C concentration in the atmosphere in the corresponding year based on the ¹⁴ C ratio in the air in the 1950s is called percent Modern Carbon (pMC). When measuring the present radiocarbon and fossil carbon (i.e., no radiocarbon) of the sample being analyzed, the pMC value obtained here is directly related to the bio-based carbon content of the sample. For example, when the bio-based carbon content is 25%, it can be understood that bio-based carbon is 25% and petroleum-derived carbon is 75% of the total carbon. As a specific method for measuring bio-based carbon content, a sample (resin) is dried to remove moisture, then weighed, and CO ₂ generated by burning the sample is adsorbed to an adsorbent through chemical manipulation, and measurement with a liquid scintillation counter method, a method of converting CO ₂ generated by burning the sample into carbon graphite and then measuring it with an accelerator mass spectrometer, a method of synthesizing benzene from CO ₂ generated by burning the sample and measuring it with a liquid scintillation counter, etc. , the bio-based carbon content can be specified.

The bio-based aqueous acrylic emulsion resin of the present invention may include one or more structural units of bio-based alkyl (meth)acrylate. The above "alkyl" (meth)acrylate is a generic term for "alkyl" acrylate and "alkyl" methacrylate. The bio-based alkyl (meth)acrylate may be formed by a reaction between (meth)acrylic acid and bioalcohol. As the bioalcohol, commercially available bioethanol or biobutanol may be used. The bio-based alkyl (meth)acrylate (MA or EA) can be synthesized by the following method. For example, acrylic acid and a small amount of bioalcohol (10-30 wt %) are fed into a reactor filled with cation exchange resin and operated at a temperature of 60-80 °C. The reaction solution is stripped off to remove unreacted acid as a high boiling point substance. Afterwards, the water is separated and the alcohol is extracted and recovered for reuse. A polymerization inhibitor such as hydroquinone or phenothiazine is added to each column. The remaining crude ester is distilled to obtain high-purity bio-based alkyl acrylate. The bio-based alkyl (meth)acrylate may have a bio-based carbon content of 20% or more, 30% or more, 40% or more, 50% or more, or 60% or more.

In addition, as long as the bio-based aqueous acrylic emulsion resin of the present invention satisfies the bio-based content of 20% to 40%, preferably 20% to 30%, commercially available resins may be freely used. Manufacturers of commercially available bio-based aqueous acrylic emulsion resins include DSM, BASF, Dow, HallStar, WANHUA, and the like, preferably WANHUA's Archsol 8171, 8175, and 8177.

The bio-based aqueous acrylic emulsion resin of the present invention has a bio-based carbon content of 20 to 40%, preferably 20 to 30%, and satisfies the minimum bio-based carbon content specified by the USDA.

The water-based coating composition of the present invention includes 10 to 50% by weight, preferably 20 to 50% by weight, and most preferably 25 to 45% by weight of the bio-based aqueous acrylic emulsion resin. By being included in the above range, it is possible to satisfy the physical property standards equal to or higher than those of conventional paints using petroleum-based compounds while having eco-friendliness. When the content of the bio-based aqueous acrylic emulsion resin is increased within the above range, a superior effect is exhibited in stain resistance. In an embodiment of the present invention, when the content of the bio-based aqueous acrylic emulsion resin is 20% by weight or less, the fouling resistance is poor even in the presence of a fluorine additive. Therefore, when the content of the bio-based aqueous acrylic emulsion resin is 21 to 50% by weight, preferably 21 to 45% by weight based on the total weight of the paint composition, the KS M 6010 water-based paint internal 2nd class standard is It is preferable because it is not only satisfied, but also exhibits an excellent stain resistance effect.

The aqueous acrylic emulsion resin has a weight average molecular weight of 100,000 to 500,000 g/mol, preferably 300,000 to 400,000 g/mol. When it is contained within the above range, it is advantageous to adjust the bio-based carbon content within the standard range according to the intended use of the aqueous coating composition of the present invention. In addition, when the molecular weight is out of the above range, deterioration occurs in washing resistance, freezing stability, water resistance, adhesion, antifouling property, etc.

In an embodiment of the present invention, the aqueous acrylic emulsion resin has a glass transition temperature (Tg) of -30 ° C to 30 ° C, preferably -15 ° C to 10 ° C, most preferably -5 ° C to 5 ° C, and a solid content This is 30 to 60% by weight, preferably 40 to 60% by weight. Within the aforementioned range, effects such as excellent water resistance, adhesiveness, and antifouling properties may be exhibited.

The water-based coating composition containing the bio-based aqueous acrylic emulsion resin of the present invention has a bio-based carbon content of 20 to 30%, preferably 20 to 27%, and meets the specifications as an eco-friendly architectural paint applied to the interior of a building described above is to be satisfied

The aqueous coating composition of the present invention may include a urea compound. In an embodiment of the present invention, the urea compound is urea, ethyleneurea, propyleneurea, 1,3-dimethyl-2-imidazolidinone, thiourea, N-methylurea, N,N'-epsilon-dimethylurea and 1,1,3,3-tetramethylurea, preferably ethyleneurea or propyleneurea. Acetoacetamide, hydrazine derivatives, zeolites and the like are known as conventional formaldehyde adsorbents. However, acetoacetamide must be melted at a high temperature to be used in a solid state, and there is a problem of yellowing due to UV. In addition, hydrazine derivatives are toxic, and zeolites are natural materials, but formaldehyde re-adsorption is impossible. On the other hand, urea compounds are easy to apply to paints as liquid additives, and their stability and physical properties have been verified. The urea compound reacts with formaldehyde (covalent bond) to form a harmless non-volatile molecule, and the reaction (covalent bond) starts as soon as it comes into contact with formaldehyde in the air at room temperature. KS I 3547 is a test method for evaluating the performance of formaldehyde adsorbent materials. This is achieved by supplying air at a certain concentration into an adsorption test chamber with constant temperature, relative humidity, supply concentration, and ventilation, and obtaining the air concentration in the chamber, the flow rate of air passing through, and the surface area of the test piece to obtain the adsorption rate (%), integration It is a method to evaluate adsorption amount (μg/m²), etc. Formaldehyde adsorption evaluation criteria in accordance with KS I 3547 must satisfy the adsorption rate of 65% or more and the cumulative adsorption amount of 6500 μg/m² or more.

The water-based coating composition containing the urea compound of the present invention has an adsorption amount of 10000 μg/m² or more and an adsorption rate of 80% or more, showing excellent adsorption performance. The urea compound may be included in an amount of 1 to 10% by weight, preferably 1 to 5% by weight based on the total weight of the aqueous coating composition, and when contained in the above range, excellent formaldehyde adsorption performance can be exhibited.

The aqueous coating composition of the present invention contains a fluorine compound. As the fluorine compound, a compound containing a fluorinated alkyl chain may be used. In embodiments of the present invention, commercially available fluorine additives may be used, and Chemours' Capstone™ FS-22, Capstone™ FS-30, Capstone™ FS-3000, Capstone™ FS-31, Capstone™ FS-3100, Capstone™ FS-34, Capstone™ FS-35, Capstone™ FS-50, Capstone™ FS-51, Capstone™ FS-60, Capstone™ FS-61, Capstone™ FS-63, Capstone™ FS-64, Capstone™ FS-65, Capstone™ FS-66, Capstone™ FS-81, Capstone™ FS-83, Capstone™ FS-87, Capstone™ FS-93 can be used. Excellent antifouling performance is exhibited by containing the said fluorine compound. The fluorine compound is contained in an amount of 0.1 to 5% by weight, preferably 0.1 to 3% by weight, based on the total weight of the coating composition. By setting the above range, excellent easy-cleaning performance and antifouling performance can be exhibited.

In an embodiment of the present invention, the aqueous coating composition may further include at least one additive selected from the group consisting of a pigment, a thickener, a dispersing agent, an antifoaming agent, a pH adjusting agent, a preservative, a cosolvent, and an emulsifier.

The pigment includes a colored pigment and an extender pigment, and as the color pigment, at least one selected from the group consisting of titanium dioxide (TIO ₂ ) and carbon black may be used, and the extender pigment includes talc, calcium carbonate, kaolin, and limestone. (Limestone) At least one selected from the group consisting of bentonite, perlite, aluminum, barium sulfate, and silicate-based pigments may be used. Preferably, the pigment may be any one or more selected from the group consisting of titanium dioxide, talc and calcium carbonate, most preferably a mixture thereof. When the pigment is added, high gloss, excellent dispersibility, low oil absorption, good weatherability and strong shielding power can be exhibited. The pigment may be contained in an amount of 20 to 60% by weight, preferably 30 to 50% by weight, based on the total weight of the aqueous coating composition. Preferably, the mixing ratio of the titanium dioxide, talc, and calcium carbonate may be 0.1:1 to 1:1. By satisfying the above range, water resistance and antifouling properties are satisfied, surface characteristics such as matte and glossy can be implemented, and desired color can be easily implemented.

As the thickener, a hydroxyethyl cellulose-based thickener, urethane or alkali swelling thickener, etc. may be used. As the hydroxyethyl cellulose-based thickener, Natrosol plus 330PA (Ashland), Natrosol 250HBR (Ashland), Bermocoll EHM 500 (Akzo Nobel), and Hecellose HM500 (Samsung Fine Chemicals) may be used, and as a urethane-based thickener, Acrysol RM-825 ( Rohm and Haas), Optiflow h3300vf (byk) can be used, and as an alkali swellable thickener, Acrysol TT-935 (Rohm and Haas), Acrysol TT-615 (Rohm and Haas), Acrysol DR-1 (Rohm and Haas), other zeolites, Inorganic thickeners such as diatomaceous earth and silica gel can be used. In the case of the thickener, when 0.1 to 10% by weight is added based on the total weight of the paint composition, excellent settling properties can be exhibited after the initial water input.

As the dispersant, an ethylene oxide-propylene oxide copolymer or a polycarboxylic acid dispersant can be used. A polycarboxylic acid dispersant may be preferably used. The dispersant is preferably 0.1 to 10% by weight, preferably 0.1 to 5% by weight, based on the total weight of the coating composition, because it can provide dispersion stabilization of the pigment.

The antifoaming agent may be a polysiloxane-based antifoaming agent, or a polysiloxane antifoaming agent mixed with a lipophilic component may be used. As the lipophilic component, silicone oils such as lauryl PEG-8 dimethicone, dimethicone PEG-8 laurate, and dimethicone PEG-8 succinate may be used, but are not limited thereto. The antifoaming agent is preferably 0.1 to 10% by weight, preferably 0.1 to 5% by weight, based on the total weight of the coating composition, because it does not cause external problems such as pinholes on the painted surface.

The pH adjusting agent is included to control the dispersibility of the paint composition, and the pH adjusting agent may be added to a pH of 7.3 to 10.2 to prevent gelation of the paint composition. In an embodiment of the present invention, dimethylethanolamine, 2-amino-2-methyl-1-propanol (AMP-95), and the like may be used, but are not limited thereto. The pH adjusting agent is preferably 0.1 to 10% by weight, preferably 0.1 to 5% by weight, based on the total weight of the paint composition, to prevent gelation of the paint.

The preservative is for preventing or inhibiting spoilage, and preferably methyl paraben, 1,2-benzisothiazolin-one, etc. may be used, but is not limited thereto.

The co-solvent serves to improve the smoothness of the coating film and lower the curing temperature during formation of the coating film. Such a co-agent is not particularly limited as long as it does not affect the physical properties of the paint composition, and a non-limiting example is 2,2,4-trimethyl-1,3-pentanediol monoisobutylate (2,2,4-trimethyl-1 ,3-pentanediol monoisobutylate), 2,2,4-trimethyl-1,3-pentanediol diisobutyrate (2,2,4-trimethyl-1,3-pentanediol diisobutyrate), and the like. The content of the co-solvent is not particularly limited, but may be contained in an amount of 0.1 to 20% by weight, preferably 0.1 to 10% by weight, based on the total weight of the coating composition. When the content of the co-solvent is within the above range, it is preferable to increase the strength of the coating film and the drying property of the coating composition.

As the emulsifier, an emulsifier containing no alkylphenol ethoxylate (APEO) can be preferably used, polyoxyethylene glycol is preferred, and polyoxypropylene-polyoxyethylene alkyl ether is particularly preferred. The emulsifier is preferably 0.1 to 10% by weight, preferably 0.1 to 5% by weight based on the total weight of the coating composition to form a stable emulsion.

The additives may be used in an appropriate ratio to maintain an optimal paint condition and paint condition, and in an embodiment of the present invention, may be used in an amount of 10 to 60% by weight based on the total weight of the aqueous paint composition of the present invention.

In addition, the present invention provides a paint for interior use of a building containing the above-described water-based paint composition. Although the water-based paint composition containing the eco-friendly bio-based water-based acrylic emulsion resin of the present invention is bio-based, it exhibits physical properties equivalent to or better than petroleum-based paints, satisfies the KS M 6010 water-based paint internal 2nd class standard, and has excellent adhesion and durability. And it has excellent weather resistance, antibacterial and antifungal effects, and excellent formaldehyde absorption, so it can be used as an interior paint for eco-friendly buildings. For example, it can be used as a paint for interior decoration of buildings such as concrete, cement, mortar, plaster, and wallpaper.

Hereinafter, the configuration and operation of the present invention will be described in more detail through preferred embodiments of the present invention. However, this is presented as a preferred example of the present invention and cannot be construed as limiting the present invention by this in any sense.

Example

Example 1. Preparation of bio-based aqueous coating composition

An aqueous coating composition was prepared with the composition shown in Table 1.

Furtherance Content (% by weight) Bio-based water-based acrylic emulsion resin WANHUA's ARCHSOL 8175 (solid content 48%, biobased content 30%, weight average molecular weight 350,000) 40 to 45 Ethylene Urea (denatured) 1 to 5 thickener Ashland's hydroxyethyl cellulose, bentonite 1 to 5 dispersant San Nopco polycarboxylic acid 0.1 to 1 antifoam Sanofco polysiloxane 0.1 to 1 Joongjae Eastman's Texanol (2,2,4-trimethyl-1,3-pentanediol diisobutyrate) 0.1 to 5 pH modifier Eastman AMP-95 0.1 to 1 antiseptic Thor Company 1,2-benzisothiazolin-3-one 0.1 to 1 emulsifier DOW polyoxypropylene-polyoxyethylene alkyl ether 0.1 to 1 fluorine compound Chemours Company 0.1 to 3 pigment Omya, BASF, Evonik - TiO2, talc, calcium carbonate 30 to 35 water 20 to 25

Example 2. Preparation of bio-based water-based paint composition

An aqueous coating composition was prepared with the composition shown in Table 2.

Furtherance Content (% by weight) Bio-based water-based acrylic emulsion resin WANHUA's ARCHSOL 8175 (solid content 48%, biobased content 30%, weight average molecular weight 350,000) 15 to 20 Ethylene Urea (denatured) 1 to 5 thickener Ashland's hydroxyethyl cellulose, bentonite 1 to 5 dispersant San Nopco polycarboxylic acid 0.1 to 1 antifoam Sanofco polysiloxane 0.1 to 1 Joongjae Eastman's Texanol (2,2,4-trimethyl-1,3-pentanediol diisobutyrate) 0.1 to 5 pH modifier Eastman AMP-95 0.1 to 1 antiseptic Thor Company 1,2-benzisothiazolin-3-one 0.1 to 1 emulsifier DOW polyoxypropylene-polyoxyethylene alkyl ether 0.1 to 1 fluorine compound Chemours 0.1 to 3 pigment Omya, BASF, Evonik - TiO2, talc, calcium carbonate 45 to 50 water 30 to 35

Comparative Example 1.

In Example 1, the same method as in Example 1 except that a general acrylic resin emulsion (Samhwa Paint Co., Ltd. SERATEX782, Tg: 5 ° C, solid content: 48%) that does not contain bio-based carbon was used instead of the bio-based aqueous acrylic emulsion resin. As a result, a paint was prepared.

Comparative Example 2.

A coating composition was prepared in the same manner as in Example 1, except that the modified urea derivative and the fluorine compound were not included.

Comparative Example 3.

A coating composition was prepared in the same manner as in Example 1 using a bio-based aqueous acrylic resin emulsion resin having a weight average molecular weight of 80,000 g/mol.

Comparative Example 4.

A coating composition was prepared in the same manner as in Example 1 using a bio-based aqueous acrylic resin emulsion resin having a weight average molecular weight of 600,000 g/mol.

[Test Example]

Test Example 1. Bio-based carbon content measurement test

The % bio-derived carbon content of the paint compositions of Examples 1 and 2 was calculated according to the ASTM D6866-21 Method B (AMS) test method.

Biocarbon content (%): ASTM D 6866-21 Method B (AMS)

1) Radiocarbon isotope content (pMC) is measured by an accelerated mass spectrometer

2) Biocarbon content is calculated by dividing the pMC by the atmospheric correction factor, multiplying by 100, and rounding it to an integer.

3) According to ASTM D 6866-21 22.7 ~ 22.9, if the biocarbon content exceeds 100, the biocarbon content is calculated according to the excess section

(1-5: biocarbon content 100%, 6-22: pMC × (REF/112), over 22: pMC × (REF/138))

4) For the atmospheric correction factor (REF), 100, the value corresponding to the year 2021 in ASTM D6866-21 Table 1, is applied.

5) In ASTM D 6866, the precision of the average value of biocarbon content is ± 3% (absolute value), and the precision of radiocarbon isotope content is ± 1σ relative standard deviation.

6) Sample pretreatment and measurement method: Measurement by accelerated mass spectrometer after graphitization

Example Radiocarbon isotope content (pMC) Bio-derived carbon content (%) Example 1 25.44 25 Example 2 24.90 25

Test Example 2. Eco-friendliness, antibacterial, antifungal test

go. Eco-friendliness test

Eco-friendliness was tested in accordance with the test methods in the table below.

Test Items unit Test Methods Results of Example 1 VOC content g/L KS M ISO 11890-1: 200728 (content standard: 100 or less) 28 VACs % National Institute of Environmental Research Notice No. 2021-12 (application) not detected benzene % National Institute of Environmental Research Notice No. 2021-12 (application) not detected toluene % National Institute of Environmental Research Notice No. 2021-12 (application) not detected Pb % KS M ISO 3856-1 : 1984 not detected CD % KS M ISO 3856-4 : 1984 not detected Hg % KS M ISO 3856-7 : 1984 not detected

me. antibacterial test

Antibacterial activity was tested according to JIS Z 2801:2012, film adhesion method.

Cover film: polyethylene film (40 mm x 40 mm)

Test conditions: test bacterial solution at (35 ± 1) ℃, 90% R.H. The number of bacteria was measured after 24 hours of stationary culture. (Bacterial count/cm2, antibacterial activity value (log))

Antibacterial effect: Antibacterial activity value of 2.0 or more

Test organism: strain 1 Staphylococcus aureus ATCC 6538P

strain 2 Escherichia coli ATCC 8739

Strain 3 Pseudomonas aeruginosa ATCC 27853

antibacterial test Control Example 1 strain 1 Number of bacteria immediately after inoculation 2.5 x 10 ⁴ - Bacterial count after 24 h incubation 3.2 x 10 ⁴ < 0.63 antibacterial activity - 4.7 strain 2 Number of bacteria immediately after inoculation 1.3 x 10 ⁴ - Bacterial count after 24 h incubation 1.1 x 10 ⁶ < 0.63 antibacterial activity - 6.2 strain 3 Number of bacteria immediately after inoculation 2.2 x 10 ⁴ - Bacterial count after 24 h incubation 3.2 x 10 ⁵ < 0.63 antibacterial activity - 5.7

all. antifungal test

① Specimen preparation: Prepare a specimen according to ASTM G21-15(2021)e1, immerse it in water for 15 days, take it out, dry it for 1 day, apply the paint of Example 1 to a thickness of 60㎛, dry it for 24 hours, and test it.

② Anti-mildew test (ASTM G21-15(2021)e1)

- Rating: 0 to 4

(0 = None 1 = No signs of growth (10% or less) 2 = Slight growth (10% to 30%) 3 = Moderate growth (30% to 60%) 4 = Much growth (60% to complete coverage))

- Test mold: Aspergillus niger ATCC 9642

Chaetomium globosum ATCC 6205

Penicillium pinophilum ATCC 11797

Gliocladium virens ATCC 9645

Aureobasidium pullplans ATCC 15233

- Culture conditions: (28 ~ 30) ℃, 85% R.H. more than 28 days

Mold resistance (ASTM G21-15(2021)e1) test Example 1 Rating 0

Test Example 3. Formaldehyde adsorption test

The coating compositions of Examples and Comparative Examples were applied to a glass plate having a thickness of 150 mm at 300 g/m 2 (±5%) and cured to prepare test pieces. Adsorption rate (%) and formaldehyde adsorption amount (μg/m²) were evaluated in accordance with the adsorption material performance evaluation (KS I 3547) method.

- Evaluation criteria: Adsorption rate - 65% or more, integrated adsorption amount - 6500 μg/m² or more

Formaldehyde adsorption amount (μg/m²) Adsorption rate (%) Example 1 13706.7 84.4% Example 2 16418.8 94.5% Comparative Example 2 1188.2 25.5%

Test Example 4. General physical properties and contamination resistance test

The coating compositions of Examples and Comparative Examples were applied to a glass plate having a thickness of 150 mm at 300 g/m 2 (±5%) and cured to prepare test pieces. Physical properties were tested by the test method according to KS M 6010:2014. In order to evaluate the basic properties of the paint, adhesion, washability, 45°, 0° diffuse reflectance, water resistance, freezing stability, odor, and state in the container were evaluated by referring to the KS M 6010 Class 2 Level 2 standard.

In the stain resistance test, the paint compositions of Examples and Comparative Examples were coated on a Leneta film with 5-mil, dried at room temperature for 7 days, mixed with 5% carbon black in Vaseline brand baby jelly and stirred to prepare a contamination source, and the contamination source was used. to contaminate the paint on the Leneta film, remove the excess contamination source after 1 hour, install the specimen in the left and right reciprocating machine (washability measuring machine), and wipe it with gauze using 1% diluted neutral detergent water (5 round trips), After drying the specimen, Cleanability Rating was measured.

※ Pass if Cleanability Rating is 8 or higher

R = (L (WASHED) - L (UNWASHED)) / (L (INITIAL) - L (UNWASHED)) X 10

Test Items Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 45°, 0° diffuse reflectance (%) 92.4 91 92.1 92.3 91.0 92.5 Wash resistance (time) 300 times
more 300 times
more 300 times
more 300 times
more 300 times
under 300 times
under Freezing stability clear clear clear clear clear NG adhesiveness clear clear clear clear NG clear water resistance clear clear clear clear clear NG smell clear clear clear clear clear clear state in the vessel clear clear clear clear clear clear stain resistance 8.7 6.6 8.4 5.1 4.9 5.2 Formaldehyde adsorption performance award award - under - -

The coating compositions of Examples 1 and 2 satisfied all of the KS M 6010 2nd class standards. This is equivalent to or better than that of Comparative Example 1, which does not contain bio-based carbon. In contrast, Comparative Example 2, which did not contain a urea compound and a fluorine compound, had poor stain resistance, and Comparative Examples 3 and 4, which were out of the weight average molecular weight range of the present invention, had wash resistance, freezing stability, adhesion, water resistance, and water resistance. It was less polluting. Comparing Example 1 and Example 2, Example 2 was added with the same fluorine additive as in Example 1, but the content of the bio-based aqueous acrylic emulsion resin was small and the stain resistance was poor.

As described above, the water-based paint composition of the present invention, even though it is a bio-based paint, has physical properties equivalent to or better than those of conventional petroleum-based paints, has excellent stain resistance, antibacterial and antifungal performance, excellent formaldehyde adsorption performance, and is environmentally friendly. .

The above description of the present invention is for illustrative purposes, and those skilled in the art can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be.

Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the claims to be described later, and all changes or modifications derived from the concept of the meaning and scope of the claims should be construed as being included in the scope of the present invention.

Claims (8)

An aqueous coating composition comprising 10 to 50% by weight of a bio-based aqueous acrylic emulsion resin, 1 to 10% by weight of a urea compound, and 0.1 to 5% by weight of a fluorine compound,
The urea compound is urea, ethyleneurea, propyleneurea, 1,3-dimethyl-2-imidazolidinone, thiourea, N-methylurea, N,N'-epsilon-dimethylurea and 1,1,3,3 - any one or more selected from the group consisting of tetramethylurea;
The weight average molecular weight of the bio-based aqueous acrylic emulsion resin is 100,000 to 500,000 g / mol,
The bio-based aqueous acrylic emulsion resin is characterized in that the bio-based carbon content is 20 to 40%, water-based paint composition. delete The water-based paint composition according to claim 1, wherein the bio-based carbon content of the water-based paint composition is 20 to 30%. delete The water-based paint composition according to claim 1, wherein the bio-based aqueous acrylic emulsion resin has a glass transition temperature (Tg) of -30°C to 30°C and a solid content of 30 to 60% by weight. The aqueous coating composition according to claim 1, further comprising at least one additive selected from the group consisting of a pigment, a thickener, a dispersing agent, an antifoaming agent, a pH adjusting agent, a preservative, a co-solvent and an emulsifier. The water-based paint composition according to claim 6, wherein the pigment is at least one selected from the group consisting of titanium dioxide, talc, and calcium carbonate. An interior paint for construction comprising the aqueous paint composition according to any one of claims 1, 3 and 5 to 7.