KR102648380B1 - wall finishing materials - Google Patents

Abstract

The present invention relates to a wall plastering finishing composition, and more specifically, 1% to 10% by weight of EVA (ethylene vinyl acetate) resin; 20% to 50% by weight of slaked lime powder; 1% to 10% by weight of red clay; and 30% to 60% by weight of silica sand; It relates to a wall plastering composition comprising a.

Description

Wall plaster finishing material composition {wall finishing materials}

The present invention relates to a wall plastering composition.

Currently, it is known that the architectural culture that uses various types of cement as the main raw material and the interior and exterior building materials processed with chemicals to create beautiful interior decoration cause various harmful substances and sick building syndrome over time. In particular, cement cannot be recycled, and the hazardous substances in cement can cause fatal harm to the human body. In other words, it contains heavy metals such as formaldehyde, nickel, radon, and chromium. In particular, chromium has been found to be the most damaging heavy metal, penetrating directly into the human skin rather than the respiratory tract and causing diseases such as skin cancer. Therefore, environmentally friendly building construction materials and interior and exterior materials are in demand. Lime (e.g. slaked lime) has various effects, most notably sterilizing ability and humidity control ability. Lime (e.g. slaked lime) has excellent sterilizing effects and toxic removal abilities, is excellent at neutralizing harmful substances, and has excellent purifying abilities. Natural pure lime (e.g. slaked lime) has too much viscosity when mixed with water, making it difficult to mold into a specific shape. Loss of adhesion occurs simultaneously with the release of moisture, and shrinkage occurs due to the release of moisture between particles. There is a problem that it is difficult to commercialize it as an interior and exterior material for buildings by itself because cracks occur on the surface, such as splitting or falling.

Public patent 10-2022-0072001

The present invention is intended to solve the above-mentioned problems, and uses EVA resin (e.g., a material made by copolymerizing ethylene and vinyl acetate raw materials) and/or surface-treated lime (e.g., slaked lime). The aim is to provide a wall plastering composition with improved durability that can be applied to improve workability and adhesion and prevent cracks from occurring.

However, the problems to be solved by the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

According to one embodiment, the wall plastering composition includes 1% to 10% by weight of EVA (ethylene vinyl acetate) resin; 20% to 50% by weight of slaked lime powder; 1% to 10% by weight of red clay; and 30% to 60% by weight of silica sand; It may include.

According to one embodiment, the wall plastering composition includes 1% to 10% by weight of slaked lime powder having an acrylic polymer coating layer; It further includes, and the slaked lime powder having the acrylic polymer coating layer includes a slaked lime particle core; a first coating layer formed on the surface of the slaked lime particle core and formed of a first coating composition containing a first acrylic polymer and porous silica powder; and a second coating layer formed of a second coating composition containing a second acrylic polymer and an EVA resin on the first coating layer; It may include.

According to one embodiment, the first coating layer and the second coating layer have a thickness of 100 nm to 500 ㎛ (micrometer), respectively, and the porous silica powder includes silica fibers, silica nanotubes, silica rods, and silica wires, and Containing one or two or more types of spherical particles, the porous silica powder is surface functionalized with a thiol group, an amine group, or a carboxyl group, and the porous silica powder has a size of 80 nm to 200 ㎛ (micrometer), 1 It may include one or two or more selected from a pore volume of 10 cm ³ /g, a pore size of 1 nm to 500 nm, and a specific surface area of 10 ㎡ /g to 1,000 ㎡ /g.

According to one embodiment, the wall plastering composition includes 1% to 10% by weight of an amino surfactant complex; Further comprising, the amino surfactant complex,

Behenyl polyethoxylated methacrylates and polymers of acrylic acid or methacrylic acid monomers; and mono- and di-carboxylate salts of N-acylated glutamic acid; Carboxylate salts of N-acylated alanine; Carboxylate salts of N-acylated glycine; Carboxylate salts of N-acylated sarcosine; At least one amino acid surfactant selected from sodium cocoyl glutamate, sodium cocoyl alaninate, and potassium cocoyl glycinate; It may be a mixture mixed at a temperature of 50°C to 200°C.

According to one embodiment, the mass ratio (w/w) of the second acrylic polymer to the EVA resin in the second coating composition may be 1:0.1 to 0.5.

The present invention can provide a wall plastering finishing composition containing slaked lime, which secures elasticity and adhesion to prevent cracks and has improved workability, spreadability, and durability.

Hereinafter, the wall plastering composition of the present invention will be described in detail with reference to examples. However, the present invention is not limited to these examples.

The wall plastering composition of the present invention includes 1% to 10% by weight of EVA (ethylene vinyl acetate) resin; 20% to 50% by weight of lime powder; 1% to 10% by weight of red clay; and 30% to 50% by weight of silica sand; may include. The wall plastering composition may be a lime plaster for architectural plastering that prevents cracks after drying and can design a residential environment beneficial to the human body in the stucco style with a rough surface. In other words, the wall plastering finishing composition uses a composition in which slaked lime particles are dispersed in EVA resin, which can improve the adhesion of slaked lime particles and improve the durability of the finishing material.

According to one embodiment, EVA resins can provide excellent flexibility and crack resistance, workability, high ultimate strength, cohesion, adhesion (i.e., adhesion), plasticity, and abrasion resistance. In other words, the EVA resin has flexibility and the ability to absorb some movement without cracking, which can improve the flexibility of lime and further strengthen its resistance to cracking due to temperature changes, building subsidence, or other structural movements. The EVA resin can increase adhesion, which can help increase adhesion by improving the overall bonding strength of lime (e.g. slaked lime) and reducing the risk of delamination over time. The EVA resin can reduce shrinkage, and lime plaster tends to shrink as it dries and hardens, but the addition of EVA resin can alleviate this shrinkage by providing some elasticity to the lime, reducing the likelihood of cracking and separation. there is. EVA resin is what provides waterproofing properties; lime is breathable and allows moisture to pass through, while EVA can provide some degree of waterproofing. This can be beneficial in areas where a certain level of water repellency is needed without compromising the overall breathability of lime. EVA resin can improve impact resistance, and adding EVA resin can improve the impact resistance of lime, increasing resilience to light impact or abrasion. In addition, EVA resin can improve spreadability, and the flexibility of EVA resin can improve spreadability and increase work performance.

According to one embodiment, the EVA (ethylene vinyl acetate) is 1% to 10% by weight of the wall plastering composition (based on total mass); 1% to 8% by weight; 1% to 5% by weight; or 1% to 3% by weight; It can be. By applying the mentioned content range, it is possible to provide a wall plastering composition with reduced shrinkage deformation, excellent flexibility, crack resistance, and improved spreadability.

According to one embodiment, the EVA (ethylene vinyl acetate) resin is a copolymer of ethylene and vinyl acetate ((Ethylene-vinyl acetate Copolymer), and the vinyl acetate content is 5% to 50%; 10 % to 50%; or 25% to 50% ((based on mass); Preferably, the vinyl acetate content may be 30% to 40%. According to one embodiment, the melt flow index of the EVA resin ( 230° C., 2.16 kg; ASTM D1238) is 0.7 g/10min to 50 g/10min, 5 g/10min to 45 g/10min; 5 g/10min to　30　g/10min; or from 5 g/10min　20　It may be g/10min. Preferably from 5 g/10min　12　It may be g/10min. By applying the mentioned vinyl acetate content and/or melt flow index, the wall plastering composition with improved processability, adhesion, spreadability, impact resistance and/or durability can be provided.

According to one embodiment, the slaked lime powder contains calcium hydroxide, Ca(OH) _{2 ,} and may be a material referred to as “hydrated lime.” The slaked lime powder can improve initial strength and provide fluidity. According to one embodiment, the slaked lime powder may include fine particles, for example, 2,000 ㎛ (micrometer) or less; 1,000 ㎛ (micrometer) or less 800 ㎛ (micrometer) or less; 500 μm (micrometer) or less; 100 μm (micrometer) or less; 50 ㎛ (micrometer) or less, 30 ㎛ (micrometer) or less, 20 ㎛ (micrometer) or less; Or it may include particles having a size (e.g., average value) (e.g., size of diameter or length) of 1 μm (micrometer) to 10 μm (micrometer). According to one embodiment, the slaked lime powder may have a BET specific surface area obtained by nitrogen adsorption of 20 m ² /g to 1,000 m ² /g. According to one embodiment, the slaked lime powder has pores with a diameter ranging from 100 angstroms to 300 angstroms, and may include porous particles with a porosity of 30% to 50%.

According to one embodiment, the slaked lime powder is 20% by weight to 50% by weight of the wall plastering finishing composition (based on total mass); 25% to 40% by weight; or 30% to 40% by weight; It can be. By applying the mentioned content range, the workability and durability of the wall plastering composition can be improved by developing strength and fluidity.

According to one embodiment, the wall plastering composition may optionally further include 1% to 10% by weight (based on the total mass of the composition) of slaked lime powder having an acrylic polymer coating layer. Slaked lime powder having an acrylic polymer coating layer includes a coating layer of a water-based acrylic polymer, thereby improving miscibility, compatibility, and adhesion with the components in the wall plastering composition, and is mixed with EVA to provide excellent initial strength and flexibility, It can improve spreadability and durability. According to one embodiment, when applied by mixing slaked lime powder with an acrylic polymer coating layer and slaked lime powder (powder without a coating layer), or when applied alone (i.e., when applied alone), the content range of the slaked lime powder mentioned above can be applied. .) can be applied.

According to one embodiment, the slaked lime powder having the acrylic polymer coating layer includes a slaked lime particle core; A first coating layer formed on the surface of the slaked lime core and formed of a first coating composition containing a first acrylic polymer and silica powder (eg, silica porous particles); and a second coating layer formed of a second coating composition containing a second acrylic polymer and an EVA resin on the first coating layer; may include. By applying water-soluble acrylic polymer and porous silica powder, breathability, anti-fouling, waterproofing functions, adhesion, moldability, and workability can be improved, and durability can be improved while preventing the occurrence of cracks.

According to one embodiment, the slaked lime core may apply the slaked lime powder mentioned above. According to one embodiment, the first coating layer and the second coating layer have a thickness of 100 nm to 500 μm (micrometer), respectively; 500 nm to 500 μm (micrometer); 1 μm (micrometer) to 500 μm (micrometer); Or 100 ㎛ (micrometer) to 300 ㎛ (micrometer), and the thickness of the first coating layer may be thicker than the thickness of the second coating layer. For example, the first coating layer is 1.2 times or more than the second coating layer; 1.5 times more; Alternatively, it may be thicker than 2.0 times. In other words, by applying the mentioned thickness, it is possible to provide the wall plastering composition with improved waterproofing function, flexibility, spreadability, etc.

According to one embodiment, the silica (SiO ₂ ) powder may be a porous silica powder. For example, the porous silica powder is one type selected from silica fibers, silica nanotubes, silica rods, silica wires, and spherical silica particles. Or it may include two or more types. For example, it may be a porous aggregate in which one or two or more types selected from silica fibers, silica nanotubes, silica rods, silica wires, and spherical silica particles are aggregated. The aggregates may be particles or nanosheets. By applying the porous particles, it is possible to prevent pores and cracks by providing breathability and appropriate water/moisture absorption.

According to one embodiment, the silica powder is a fine powder, and the powder size is 80 nm to 500 ㎛ (micrometer); 80 nm to 200 μm (micrometer); 200 nm to 200 μm (micrometer); 300 nm to 100 μm (micrometer); 0.5 μm to 10 μm (micrometer); or 0.5 μm (micrometer) to 5 μm (micrometer). The powder size may mean diameter, thickness or length. According to one embodiment, the density of the silica powder may be 0.3 g/m ³ to 0.9 g/m ³ . According to one embodiment, the specific surface area of the silica powder may be 10 m2/g to 1,000 m2/g, preferably 100 m2/g to 700 m2/g, and more preferably 500 m2/g to 600 m2/g. It may be ㎡/g. According to one embodiment, the pore size (diameter size) of the silica powder is 1 nm to 1 ㎛ (micrometer); 1 nm to 500 nm; 5 nm to 200 nm; Or it may be 5 nm to 50 nm. According to one embodiment, the pore volume of the silica powder may be 1 cm ³ /g to 10 cm ³ /g. According to one embodiment, the porosity of the silica powder may be 30% to 60%.

According to one embodiment, the oil absorption amount of the silica powder may be 100 ml/100g to 1,000 ml/100g. Preferably it may be 100 ml/100g to 500 ml/100g, and more preferably 200 ml/100g to 400 ml/100g.

According to one embodiment, the values mentioned in the description of the above-mentioned powder may be average, minimum or maximum values. In addition, the size, pore characteristics, and adsorption amount (i.e., BET analysis using nitrogen gas) of the above-mentioned powder can be measured by methods known in the technical field of the present invention, for example, particle size analyzer, TEM, and SEM. , particle shape and size can be measured using zeta potential, etc., and surface area and pore diameter can be measured by performing Brunauer-Emmett-Teller (BET) and Barrett-Joyner-Halenda (BJH) analysis.

According to one embodiment, the silica powder may mean micronized porous silica gel. Generally, when acid is added to liquid silicic acid, silica sol with primary particles is generated, and the silanol group (Si-OH) present on the surface of the primary particle is dehydrated and condensed by the continuous addition of acid, thereby promoting Si- A three-dimensional network structure is formed by forming a network of O-Si, which is called silica gel. This silica gel exhibits porosity, and its micronization may be silica fine powder.

According to one embodiment, the silica powder may be a silica powder surface-treated with a hydrophilic group. The hydrophilic group may be a thiol group, an amine group, or a hydroxy group. Preferably, it may be a thiol group. The surface functionalized with the hydrophilic group improves compatibility and bonding strength within the acrylic polymer, and improves bonding strength with the slaked lime surface and the strength and durability of the wall plastering composition. According to one embodiment, the functionalization reaction may be performed by treating the silica powder with a basic or acid solution. For example, after acid treatment in an aqueous acid solution of nitric acid/sulfuric acid (1:1 to 3 (v/v)) (0.1N to 1N) for 10 minutes to 1 hour, in a solution containing a compound having a functional group. The functionalization process can be performed at 90°C to 120°C for 1 to 2 hours. The compound may be added in an amount of 1 to 15 parts by weight based on 100 parts by weight of the silica powder. The thiol group uses a compound having a thiol functional group, such as ammonium thioglycolate (AmTG), 1,3-Diisopropyl-2-thiourea, N-(3 -Methoxyphenyl)thiourea (N-(3-Methoxyphenyl)thiourea) or 1,3-dihexyl-2-thiourea (1,3-dihexyl-2-thiourea) can be applied. The amine group is a compound having an amine functional group, butylamine, pentylamine, hexylamine, heptylamine, octylamine, nonylamine, decylamine, hexadecylamine, undecylamine, dodecylamine, tridecylamine, tetradecylamine. Decylamine, diaminopentane, diaminohexane, diaminoheptane, diaminooctane, diaminononane, diaminodecane, diaminooctane, dipropylamine, dibutylamine, dipentylamine, dihexylamine, diheptyl Amines, dioctylamine, dinonylamine, didecylamine, methylpropylamine, ethylpropylamine, propylbutylamine, ethylbutylamine, ethylpentylamine, propylpentylamine, butylpentylamine, tributylamine or trihexylamine. etc. can be applied.

According to one embodiment, the silica powder is 1 to 40 parts by weight based on 100 parts by weight of the first acrylic polymer; 2 to 30 parts by weight; or 3 to 10 parts by weight; can be included. Preferably, it may be included in 3 to 7 parts by weight. By applying the mentioned content range, the wall plastering composition can be provided by adsorbing gas or moisture, reducing the occurrence of pores, and improving bonding force, strength, and flexibility.

According to one embodiment, the acid value of the acrylic polymer included in the first coating composition and the acrylic polymer included in the second coating composition may be 10 mg KOH/g to 100 mg KOH/g, respectively. According to one embodiment, the molecular weight (weight average molecular weight) of the acrylic polymer contained in the first coating composition and the acrylic polymer contained in the second coating composition is 10,000 (mol/g) to 1,000,000 (mol/g), respectively. It may be. According to one embodiment, the molecular weight and/or acid value of the acrylic polymer included in the first coating composition and the acrylic polymer included in the second coating composition may be different. According to one embodiment, the first acrylic polymer included in the first coating composition has an acid value of 55 to 60 (mg KOH/g), a hydroxyl value of 90 to 96 (mg KOH/g), and a weight average molecular weight. It may include an acrylic polymer having a weight of about 450,000 to about 600,000. Alternatively, the second acrylic polymer may have an acid value of 45 to 50 (mg KOH/g), a hydroxyl value of 80 to 90 (mg KOH/g), and a weight average molecular weight of about 250,000 to 400,000. In other words, the dispersibility/adhesion of silica powder or the mixing and adhesion of EVA can be improved by controlling the acid value and water radical value.

According to one embodiment, the glass transition temperature of the first acrylic polymer and the second acrylic polymer is 10 ℃ to 80 ℃, respectively; 10°C to 30°C; Or it may be 40°C to 70°C. The glass transition temperatures of the first acrylic polymer and the second acrylic polymer may be different from each other.

According to one embodiment, the first acrylic polymer and the second acrylic polymer satisfy the mentioned physical properties, and an appropriate product can be purchased and applied to implement the purpose of the present invention, and the product name is not specifically mentioned in this document. No.

According to one embodiment, the acrylic polymer in the coating composition is formed by polymerizing a monomer selected from a reactive unsaturated acrylate monomer and a monomer containing a carboxyl group, and such polymerization is a method of producing an acrylic polymer known in the art of the present invention. can be used, but is not specifically mentioned in this specification. For example, the reactive unsaturated acrylate monomer includes alkyl acrylate, alkyl methacrylate, cycloalkyl acrylate, cycloalkyl ethacrylate, alkoxyalkyl acrylate, and alkoxyalkyl methacrylate ester having 1 to 18 carbon atoms. , hydroxyalkyl acrylate having 2 to 8 carbon atoms, hydroxyalkyl methacrylate ester, acrylonitrile, methacrylonitrile, and trifluoroethyl methacrylate. It may be one type or a mixture of two or more types. The monomer containing the carboxyl group may be one or a mixture of two or more selected from acrylic acid, methacrylic acid, vinylbenzene acid, itaconic acid, maleic acid, fmalic acid, and anhydrides thereof. Additionally, the acrylic polymer may be formed using a crosslinking agent containing an acrylic group containing two or more ethylene groups. Here, the reaction can proceed by adding more solvent (e.g. water), chain transfer agent, and surfactant.

According to one embodiment, the initiator may be a water-soluble initiator, an oil-soluble initiator, or an oxidation-reduction initiator, and preferably, a thermally dissociable radical initiator may be used. For example, examples of the water-soluble initiator include ammonium persulfate, sodium persulfate, and potassium persulfate, which can be used alone or together with a reducing agent such as sodium bissulfite and sodium formaldehyde sulfoxylate. The oil-soluble initiator includes t-butyl hydroperoxide, dibutyl peroxide, benzoyl hydroperoxide, perbenzoic acid, hydrogen peroxide, and peracetic acid, and may be used alone or in combination with the above-described reducing agent.

According to one embodiment, the chain transfer agent may be an alkyl mercaptan having 2 to 15 carbon atoms, a mercapto carboxylic acid ester having 2 to 8 carbon atoms, carbon tetrachloride, bromotrichloromethane, etc., but the resulting polymer The type of compound that can be used to control molecular weight is not limited.

According to one embodiment, the first coating composition and the second coating composition may further include at least one of water and an organic solvent, if necessary. For example, the solvent may be optionally included within the range of 0.1% by weight to 80% by weight in the first coating composition and the second coating composition.

According to one embodiment, the method for producing slaked lime powder having an acrylic polymer coating layer includes coating the slaked lime powder with a first coating composition, drying the slaked lime powder, and then coating the first coating composition with a second coating composition. After drying, it can be formed.

According to one embodiment, the method for producing slaked lime powder having the acrylic polymer coating layer includes forming a first coating layer by coating the surface of the slaked lime core with a first coating composition containing a first acrylic polymer; forming a second coating layer formed on the first coating layer and made of a second coating composition; And it may include the step of heat treating and drying the slaked lime on which the first coating layer and the second coating layer are formed.

According to one embodiment, a drum coater, a fan-type coater, a fluidized bed coater, etc. can generally be used as a coater. The drum coater and the fan-type coater are easy to operate and can produce a large amount, but the coater is used within the coater. In the present invention, it is preferable to use a fluidized bed coater because the liquid contained in the material cannot be dried quickly, resulting in slaked lime coagulation or poor film formation. Slaked lime powder having an acrylic polymer coating layer can be produced by coating the surface of a slaked lime core flowing through a pressurized two-fluid nozzle with the coating composition using a generally known fluidized bed granular coating machine.

According to one embodiment, before proceeding with the coating, it is desirable to preheat the inside of the coating machine to evaporate the moisture remaining in the slaked lime and remove the dust attached to the slaked lime, and proceed with the coating. Preheating can be performed for 5 to 10 minutes by maintaining the inlet temperature at about 60 ℃ to 100 ℃ and the internal temperature of the coater at 60 ℃ to 70 ℃, but the above conditions can be changed depending on the performance of the coater or required physical properties. It may be possible.

According to one embodiment, once the preheating of the coater is complete, the core of slaked lime is coated with the first coating composition. The first coating composition is sprayed through a two-fluid nozzle with an air pressure of 0.2 kg/cm ² to 3 kg/cm ² of the air mixing spray nozzle at a rate of 5 g/min to 100 g/min through a pump to coat the slaked lime surface. The first coating layer can be formed by primary coating.

According to one embodiment, when the formation of the first coating layer is completed, the supply of the first coating composition is stopped, and the second coating composition is sprayed in the same manner as the first coating to apply a secondary coating to the slaked lime surface on which the first coating layer was formed. Coating may be performed to form a second coating layer. At this time, the coverage rate of the second coating layer may be about 2 to 15%, and the coverage rate of the first coating layer may be higher than that of the second coating layer, and may be about 5% to 25%; 10% to 25%; 15% to 25%; Alternatively, it is preferable to adjust it to 20% to 25%. The above conditions can be changed depending on the covering machine performance or required physical properties.

According to one embodiment, after the second coating layer is formed using the second coating composition, the coating layer is dried through heat treatment. In particular, the heat treatment can maintain strong film formation between the polymer particles in the first coating layer and the second coating layer.

According to one embodiment, the heat treatment process can generally be performed using a hot air gun, the amount of hot air is maintained the same as the coating process, and the heat treatment temperature is performed at 30 to 100 ° C. for about 5 to 100 minutes, more preferably Can be carried out at 60 to 100 ℃ for about 20 to 60 minutes, but the conditions may be changed depending on the coating machine performance or required physical properties. In addition, it is preferable to dry the first coating layer and the second coating layer so that the moisture content in the first coating layer and the second coating layer is 20% by weight or less through the heat treatment, and more preferably, the moisture content is 10% by weight or less.

According to one embodiment, the red clay uses raw red clay collected from nature, and the raw red clay can be used by sieving it through a fine sieve. The red clay has a particle size of 0.02 mm to 0.05 mm, and has a composition of 40% to 80% quartz, 10% to 20% feldspar and mica, 5% to 40% carbonate minerals, and 2% to 10% silt, respectively, by weight. It is a mineral composed of 50% to 60% of SiO ₂ , 8% to 12% of Al ₂ O ₃ , 2% to 4% of Fe ₂ O ₃ , 4% to 12% of K ₂ O, and 4% to 4% of CaO. It is composed of 12%, MgO 2% to 6%, and less than 1% (by mass) of TiO ₂ , MnO, Na ₂ O, etc., and has a double-layer structure mainly of illite components, with many pores and hydrophilic hydroxyl groups or ionized It has a surface and has excellent temperature and humidity control functions, adsorption of harmful substances, detoxification, and far-infrared ray radiation functions. When used as interior and exterior materials for buildings, it is harmless to the human body and can be beneficial to health compared to other materials. It can provide excellent characteristics. According to one embodiment, the red clay may be 1% by weight to 10% by weight of the wall plastering finishing composition. Applying the mentioned content can provide adhesion and strength to the finishing material, improve impact resistance to reduce wear, and improve durability.

According to one embodiment, the silica sand is a general term for quartz grains rich in silica content (SiO ₂ ) and can be classified into natural silica sand and artificial silica sand. Natural silica sand is a rock containing a lot of quartz, such as granite or granitic gneiss. This refers to weathered residual silica sand (san silica sand), sedimentary silica sand, etc., and artificial silica sand refers to silver thread made into sand by selectively crushing only the quartz contained in pegmatite, and has characteristics such as translucency, fire resistance, and high hardness. Therefore, when used as a plastering material, effects such as warmth and cold insulation can be obtained while increasing strength. According to one embodiment, the silica sand is 30% by weight to 60% by weight of the wall plastering finishing composition (based on total mass); 30% to 50% by weight; Or preferably, it may be 30% by weight to 40% by weight. By applying the mentioned content, the strength of the finish can be provided, the impact resistance can be improved to reduce wear, and durability can be improved.

According to one embodiment, the wall plastering composition may further include a solvent selected from water and organic solvents. The solvent may be included in the remaining amount or 1% to 50% by weight of the wall plastering composition (based on total mass). The water may be tap water, underground water, purified water, etc., and the wall plastering composition may be molded into a dough form.

According to one embodiment, the wall plastering composition may further include the amino surfactant complex. The amino surfactant complex is applied as a thickener of the finishing composition and can improve the dispersion of slaked lime powder or slaked lime powder particles.

According to one embodiment, the amino surfactant complex is 0.1% by weight to 10% by weight of the wall plastering composition (based on total mass); 0.5% to 5% by weight; Alternatively, it may be included in 1% to 2% by weight. According to one embodiment, the amino surfactant complex includes: a) a polymer of behenyl polyethoxylated methacrylate and acrylic acid or methacrylic acid monomer; and b) mono- and di-carboxylate salts of N-acylated glutamic acid; Carboxylate salts of N-acylated alanine; Carboxylate salts of N-acylated glycine; Carboxylate salts of N-acylated sarcosine; One or more amino acid surfactants selected from sodium cocoyl glutamate, sodium cocoyl alaninate, and potassium cocoyl glycinate; It may be a mixture containing. The amino surfactant complex may be a mixture formed by heating and stirring. For example, 50°C to 200°C; 50°C to 150°C; Alternatively, it may be a mixture in which the polymer and the amino surfactant are mixed at a ratio of 1:0.5 to 1 (mass ratio) for 1 to 3 hours at a temperature of 60°C to 80°C. They can be mixed in a molten state (e.g. partially or fully molten) at the temperatures mentioned. In the mentioned mixing process, a solvent capable of dissolving them may be added as needed.

According to one embodiment, additives may be further included to improve the durability of the wall plastering composition, increase workability by applying it as a lubricant, and reduce shrinkage during processing, molding, or drying of the composition. For example, triarylcyanurate, triarylisocyanutate, caproic acid, caprylic acid, capric acid, lauric acid, stearic acid, isostearic acid, and It may further contain hexane stearic acid. Preferably triarylcyanurate; and capric acid, lauric acid, or stearic acid. These are each 0.01% to 3% by weight of the wall plastering composition (based on total mass); 0.1% to 2% by weight; 0.1% to 1% by weight; Or it may be 0.5% to 1% by weight. If the content exceeds the mentioned content, adhesiveness may decrease and problems such as cracks, peeling, and reduced strength may occur.

According to one embodiment, the wall plastering composition may further include additives for color implementation, such as dyes, water-based paints, etc. These may each be included in an amount of 0.01% to 2% by weight in the wall plastering composition (based on total mass).

According to one embodiment, the present invention first mixes slaked lime powder with a solvent to make a dough, then adds the above-mentioned EVA (ethylene vinyl acetate) resin, red clay, silica sand, and other components and stirs with a stirrer for more than 10 minutes. A wall plastering finishing composition can be manufactured.

Hereinafter, the present invention will be described in detail using examples and experimental examples to specifically explain the present invention. However, the embodiments according to the present invention may be modified into various other forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. Embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art.

Preparation Example 1: Preparation of the first acrylic polymer

Allyl methacrylate 5 g, methacrylate 25 g, ethyl acrylate 35 g, 2-ethyl hexyl acrylate 85 g, 2-hydroxyethyl acrylate 130 g, 2-hydroxyethyl methacrylate 130 g, butyl After stirring and mixing 35 g of acrylate and 70 g of acrylic acid, 1.9 g of benzoyl peroxide as an initiator was added and stirred. Next, an acrylic polymer was prepared by dropping it into the flask prepared above for 4 hours. After the dropwise addition, the polymerization reaction was performed while maintaining reflux conditions for about 1 hour, and the mixture was cooled to 60° C. to prepare the first coating composition. The acrylic polymer in the first coating composition was confirmed to have an acid value of 52.9 mg KOH/g, a hydroxyl value of 95.5 mg KOH/g, and a weight average molecular weight of approximately 500,000. 35 g of diethylethanolamine was added to the acrylic polymer, neutralized and titrated at room temperature until the pH reached 10, and then diluted with water to prepare a water-soluble polyacrylic resin composition. The acrylic polymer in the water-soluble polyacrylic resin composition prepared above had a solid content of 45%, a particle size of 160 nm, and a viscosity of 150 cps. The glass transition temperature of the acrylic polymer was confirmed to be 50°C.

Preparation Example 2: Preparation of second acrylic polymer

The polymerization reaction was performed in the same manner as in Example 1, except that 30 g of styrene was added when mixing monomers to obtain an acrylic polymer. The acrylic polymer had an acid value of 50.0 mg KOH/g, a hydroxyl value of 89.1 mg KOH/g, and a weight average molecular weight of about 300,000. 35 g of diethylethanolamine was added to the acrylic polymer, neutralized and titrated at room temperature until the pH reached 10, and then diluted with water to prepare a water-soluble polyacrylic resin composition. The acrylic polymer in the water-soluble polyacrylic resin composition prepared above had a solid content of 44%, a particle size of 163 nm, and a viscosity of 153 cps, and the glass transition temperature of the acrylic polymer was confirmed to be 48°C.

Preparation Example 3: Preparation of porous silica powder

Porous silica powder is a porous fine particle ("MSE PRO High Specific Surface Area Mesoporous Silica SBA-15 Nano Powder", BET Surface Area: 550 m ² /g to 600 m ² /g, Pore Volume: 1-2 cm ³ /g , Pore Diameter: 6-10 nm, Particle Diameter: 0.5 to 2 um).

Preparation Example 4: Surface functionalization of silica powder

Porous silica powder (same as Preparation Example 3) was immersed in an aqueous solution of nitric acid/sulfuric acid (1/1 volume ratio, acid concentration 1 M) for 1 hour, then washed and dried at 50°C. Next, it was immersed in an ammonium thioglycolate (AmTG) solution (DMF solvent, 10 parts by weight added based on the total mass of porous silica powder), heated to 90°C, and maintained for 30 minutes. After washing and drying, silica powder surface-modified with thiol groups was obtained.

Preparation Example 5: Preparation of the first coating composition

The acrylic polymer of Preparation Example 1 and the silica powder of Preparation Examples 3 to 4 were mixed and stirred (linear speed 2 m/sec) to prepare a first coating composition containing fine powder silica. The composition and properties of the prepared first coating composition are shown in Table 1. A urethane-based (Coatex, coapur-3025) thickener was used as an anti-settling agent. However, fine powder silica was used as a paste mixed at a ratio of 199 g and 60 g of water.

[Table 1]

Production example 6

Acrylates/Beheneth-25 Methacrylate Copolymer; Novethix?? L-10 Polymer (Lubrizol Advanced Materials, Inc ., Cleveland, Ohio, USA); sodium cocoyl glutamate (Amisoft ^® CS-22, Ajinomoto); and sodium cocoyl alaninate (Amilite ^® ACS-12, Ajinomoto) (mixing ratio = 1 : 0.2 : 0.2 (w) /w) was stirred at 80°C to 100°C for 2 hours to prepare an amino acid surfactant complex, which is a mixture thereof.

Manufacturing Example 7-1

Slaked lime having an acrylic polymer coating layer was prepared using the first coating composition in Table 2 and the second coating composition of acrylic polymer (95 wt%)/EVA resin (5 wt%) in Preparation Example 2. For the coating process, if necessary, each composition can be diluted by adding an appropriate amount of water.

2 kg of slaked lime with a particle size of 0.5 mm to 1 mm is weighed and put into a fluidized bed coater, the slaked lime is levitated in the air with a flowing air volume of about 200 m ³ /hr, and a preheating process is performed at a flowing air temperature of 60°C for 10 minutes. It was rough. After the preheating process was completed, 200 g of the first coating composition of Preparation Example 5-1 was sprayed on the surface of slaked lime for 50 minutes to form a first coating layer. Subsequently, 100 g of the second coating composition was sprayed for 15 minutes to form a second coating layer. At this time, the first coating layer and the second coating layer were coated under the conditions of a coating temperature of 40°C, a fluidized air volume of 350 m ³ /hr, a spray nozzle air pressure of 2 kg/cm ² , and a spray rate of 13 g/min. .

Manufacturing Example 7-2

Proceeded in the same manner as Preparation Example 7-1, except that the first coating composition of Preparation Example 5-2 was used.

Manufacturing Example 7-3

Proceeded in the same manner as Preparation Example 7-1, except that the first coating composition of Preparation Example 5-3 was used.

Manufacturing Example 7-4

Proceeded in the same manner as Preparation Example 7-1, except that the first coating composition of Preparation Example 5-4 was used.

Examples 1 to 5 and Comparative Example 1: Preparation of wall plastering finishing composition

According to Table 2, first mix slaked lime and water to form a dough, then add EVA, water-based paint, silica sand, red clay, and Preparation Examples 7-1 to 7-4 in each order and stir with a stirrer for more than 10 minutes to mix the ingredients well. did.

[Table 2]

(*): Amount in 10 kg product (kg)

**: Used in Production Example 7-1, it is an uncoated slaked lime powder of 0.5 mm to 1 mm.

EVA: VC640 Lotte Chemical

The composition in Table 2 was used to form a uniform film with a thickness of 5 mm on a 50 mm thick insulating material. Crack occurrence and external appearance deformation were observed for a certain period of time. The results are shown in Table 3.

[Table 3]

Additionally, Examples 1 to 5 showed no abnormalities in the heat resistance test (KSL 1593-98) and stability test (KSF2451-93). Examples 1 to 3 applied slaked lime with an acrylic polymer coating layer, and workability and adhesion were improved compared to Example 5 in which slaked lime alone was applied. In Example 4, silica powder was not applied to the coating layer. In Examples 4 and 5, the introduction of EVA resin had good spreadability and was applied evenly and did not cause stains. However, some fine pores or cracks were found. However, in Comparative Example 1, because EVA was not added, the adhesion strength was weak, and cracks and pores occurred, and some parts peeled off. That is, the present invention can provide a wall plastering finish with improved workability, adhesion, and durability when EVA and/or lime powder is applied as an acrylic polymer coating.

The above-described embodiments of the present invention have been disclosed for illustrative purposes, and those skilled in the art will be able to make various modifications, changes, and additions within the spirit and scope of the present invention, and such modifications, changes, and additions will be possible. should be regarded as falling within the scope of the patent claims below.

Claims (5)

1% to 10% by weight of EVA (ethylene vinyl acetate) resin;
20% to 50% by weight of slaked lime powder;
1% to 10% by weight of red clay; and
30% to 60% by weight of silica sand;
containing
The wall plastering finishing composition is,
1% to 10% by weight of slaked lime powder having an acrylic polymer coating layer; It further includes,
The slaked lime powder having the acrylic polymer coating layer,
slaked lime particle core;
a first coating layer formed on the surface of the slaked lime particle core and formed of a first coating composition containing a first acrylic polymer and porous silica powder; and
a second coating layer formed of a second coating composition containing a second acrylic polymer and an EVA resin on the first coating layer; A wall plastering finishing composition comprising a.
delete According to paragraph 1,
The thickness of the first coating layer and the second coating layer is 100 nm to 500 μm (micrometer), respectively,
The porous silica powder includes one or two or more of silica fibers, silica nanotubes, silica rods, silica wires, and spherical particles,
The porous silica powder is surface functionalized with thiol groups, amine groups, or carboxyl groups,
The porous silica powder has a size of 80 nm to 200 ㎛ (micrometer), a pore volume of 1 to 10 cm ³ /g, a pore size of 1 nm to 500 nm, and a specific surface area of 10 ㎡ /g to 1,000 ㎡ /g. A wall plastering composition comprising one or more selected substances.
According to paragraph 1,
The wall plastering finishing composition,
0.1% to 10% by weight of amino surfactant complex;
It further includes,
The amino surfactant complex is,
Behenyl polyethoxylated methacrylates and polymers of acrylic acid or methacrylic acid monomers; and
mono- and di-carboxylate salts of N-acylated glutamic acid; Carboxylate salts of N-acylated alanine; Carboxylate salts of N-acylated glycine; Carboxylate salts of N-acylated sarcosine; At least one amino acid surfactant selected from sodium cocoyl glutamate, sodium cocoyl alaninate, and potassium cocoyl glycinate;
A wall plastering finishing composition, which is a mixture mixed at a temperature of 50 ℃ to 200 ℃.
According to paragraph 1,
The mass ratio (w/w) of the second acrylic polymer to the EVA resin in the second coating composition is 1:0.1 to 0.5.