JP4280646B2 - Wall remodeling method - Google Patents

Description

  The present invention relates to a wall surface remodeling method for inner wall surfaces, ceilings, outer wall surfaces, and the like.

  In recent years, water-based paints are often used for repainting inner wall surfaces, ceilings, outer wall surfaces, and the like of houses, offices, vehicles, and the like, from the viewpoints of environmental problems, fire fighting laws, and the like. However, the inner wall, ceiling, and outer wall are often contaminated with contaminants such as graffiti, cigarette smoke, hand dust, and oily smoke. By the time they are made, these contaminants may ooze onto the coating surface, which is called bleed. In particular, the smoke caused by cigarette smoke has a large amount of water-soluble components, and when a water-based paint is applied, it gradually bleeds, and the aesthetic appearance may be significantly impaired. In general, in order to prevent such bleed, an undercoat is applied such as a sealer. However, from the viewpoint of cost reduction, it is desired to omit the undercoat application process.

In order to prevent this bleed, an indoor use in which a resin main component is a composition in which a hydrazide compound having at least two hydrazine residues per molecule as a crosslinking agent is added to an aqueous dispersion of a carbonyl group-containing copolymer. A water-based paint is disclosed. (For example, refer patent document 1.) Moreover, the aqueous emulsion coating material which contains hydrotalcite as a pigment component is disclosed. (For example, see Patent Document 2.)
However, in either case, if the inner wall surface or ceiling is finished white or pale, yellowing caused by bleed or bleeding may be observed, or the resulting coating may prevent bleeding immediately after forming the coating. The phenomenon of so-called rebleeding that gradually bleeds over time may occur, and the effect of preventing bleeding is insufficient.
Japanese Patent Laid-Open No. 5-43821 JP-A-6-207124

  The object of the present invention is to improve the wall surface suitable for inner wall, ceiling, outer wall, etc. contaminated by cigarette smoke, dirt, hand smoke, oil smoke, writing instruments, etc. Is to provide a method.

The present invention relates to a wall surface refurbishing method in which a coating film is formed by applying a curable emulsion coating composition to a wall surface, wherein the curable emulsion coating composition is a resin emulsion having a curable functional group, a color pigment, and a carbodiimide comprise a compound and lighter material, including the carboxylic acid groups of the resin emulsion as the curable functional group, the wall renovation method specific gravity of the weight member is characterized in that 0.02 to 0.5 is there. Here, the surface of the wall surface may have a cloth, wallpaper, or a coating film formed thereon. Moreover, it is preferable that content of a weight reducing material is 1-10 mass%, and it is preferable that a weight reducing material is a hollow type resin particle. Moreover, the coloring pigment is contained, for example, in a pigment volume concentration of 60 to 200%.

  Moreover, this invention is a curable emulsion coating composition used for said wall surface remodeling method.

  Furthermore, the present invention is a wall surface coating method characterized in that a coating film is formed by applying the curable emulsion coating composition described above to a wall surface.

  In the wall surface refurbishing method of the present invention, since the curable emulsion coating composition to be used contains a lightening material having a predetermined specific gravity, it is not necessary to form an undercoat to stop it, and it is contaminated by dust from tobacco smoke. Even if it is applied to the inner wall surface, ceiling, outer wall surface, etc., there is almost no bleed of these contaminants on the surface of the obtained coating film, and no yellowing due to bleed is observed. This is presumably because the bleed component is adsorbed by the weight reducing material, and the bleed component is hardly transferred to the coating film surface by curing the coating film.

  Since the curable emulsion coating composition of the present invention is a curable emulsion coating composition used in the wall surface refurbishing method, bleeding can be suppressed. Furthermore, it is considered that bleed can be further suppressed by increasing the hiding property by increasing the pigment volume concentration.

  The wall surface refurbishing method of the present invention is to form a coating film by applying a curable emulsion coating composition to a wall surface, wherein the curable emulsion coating composition is a resin emulsion having a curable functional group, a colored pigment And a lightening material having a cross-linking agent and a specific gravity of 0.02 to 0.5.

  The wall surface is a part of an inner wall surface, ceiling, or outer wall surface of a house, office, or vehicle that has already been used, such as concrete, wood, metal, a decorative board made of these, and the wall surface. The surface may be a cloth such as a vinyl cloth or cloth cloth, a cloth affixed with a wallpaper, or a film formed with a coating film. The wall surface refurbishing method of the present invention eliminates the bleeding of contaminants by applying the above curable emulsion coating composition even on inner wall surfaces, ceilings, outer wall surfaces, and the like that are contaminated by dust from tobacco smoke. It can provide a high appearance.

  It does not specifically limit as said application | coating method, For example, application | coating with a brush, spray, a roller, etc. can be mentioned. After the application, the coating film can be obtained by standing or heating at room temperature and forcibly drying. In the case where the coating amount, the drying time, and the forced drying are performed, the drying temperature can be arbitrarily set according to the type of paint, the type of wall surface, and the state.

  The curable emulsion coating composition used in the wall surface refurbishing method of the present invention includes a resin emulsion having a curable functional group, a color pigment, a crosslinking agent, and a weight reducing material having a specific gravity of 0.02 to 0.5. It is characterized by that. The curable functional group is not particularly limited, and examples thereof include a hydroxyl group, a carboxylic acid group, and a carbonyl group. The above carbonyl group represents a group in which both ends of C═O are not bonded to a hetero atom such as an oxygen atom or a nitrogen atom. The resin emulsion can be obtained by emulsion polymerization of a monomer mixed solution containing the monomer having the curable functional group and another monomer by a conventional method.

  Specific examples of the monomer having a curable functional group include hydroxyl group-containing unsaturated monomers such as 2-hydroxymethyl (meth) acrylate and carboxylic acids such as (meth) acrylic acid, which are well known by those skilled in the art. Group-containing unsaturated monomers; carbonyl group-containing unsaturated monomers such as acetoacetoxyethyl (meth) acrylate; epoxy group-containing unsaturated monomers such as glycidyl methacrylate; amide group-containing unsaturated monomers such as diacetone (meth) acrylamide be able to.

  Specific examples of the other monomers include amino group-containing unsaturated monomers such as N, N-dimethylaminoethyl (meth) acrylate; (meth) acrylic acid alkyl esters such as methyl (meth) acrylate; styrene And nitriles such as (meth) acrylonitrile. Two or more of these monomers may be included as long as they do not react during polymerization.

  From the viewpoint of making it water-based and preventing rebleeding, the monomer mixture preferably contains the carboxylic acid group-containing monomer. Further, from the viewpoint of adhesion to the base, the monomer mixed solution further preferably contains the carbonyl group-containing monomer.

  The monomer mixture may further contain a crosslinkable monomer or a chain transfer agent. The crosslinkable monomer is not particularly limited. Specifically, ethylene glycol di (meth) acrylate, divinylbenzene and the like are not particularly limited as the chain transfer agent, and specifically, alkyl such as lauryl mercaptan. Mercaptan; 2-ethylhexyl thioglycolate, α-methylstyrene dimer and the like well known by those skilled in the art can be mentioned.

  When the monomer mixture liquid contains a carboxylic acid group-containing monomer, the acid value is preferably 10-30. If it is out of the above range, there is a fear that the re-bleeding preventing power of the obtained coating film is insufficient. Moreover, when the said monomer liquid mixture contains a carbonyl group containing monomer, it is preferable that a carbonyl group value is 300-1200. If it is out of the above range, the adhesion of the resulting coating film to the ground may be insufficient. In the present specification and claims, the above carbonyl group value means the number of mg of carbonyl group and this mole of KOH contained per 1 g of resin solid content based on the same idea as the acid value. It is.

  Examples of the emulsion polymerization include persulfates such as ammonium persulfate; peroxides such as hydrogen peroxide; redox initiators such as a combination of a reducing agent such as Rongalite and an oxidizing agent such as the above initiator; Polymerization initiators such as azo compounds such as' -azobis-4-cyanovaleric acid can be used.

  The volume average particle diameter of the obtained resin emulsion is not particularly limited, and is, for example, 10 to 500 nm. The volume average particle diameter can be determined by a method well known by those skilled in the art, such as a laser light scattering method.

  The color pigment contained in the curable emulsion coating composition is not particularly limited, and examples thereof include inorganic pigments such as yellow iron oxide, iron oxide, carbon black, and titanium dioxide; azo chelate pigments, insoluble azo pigments, and condensed azo pigments. Examples thereof include organic pigments such as pigments, phthalocyanine pigments, indigo pigments, perinone pigments, perylene pigments, dioxane pigments, quinacridone pigments, isoindolinone pigments, and metal complex pigments.

  In addition, it is preferable that the pigment volume concentration of the said curable emulsion coating composition is 50 to 200%, and more preferably 70 to 200%. If it is less than 50%, the resulting coating film may be insufficiently prevented from bleeding, and if it exceeds 200%, the appearance of the resulting coating film may be deteriorated. The calculation of the pigment volume concentration referred to here does not include the condensed aluminum phosphate powder. Thus, by increasing the pigment concentration, the hiding power can be increased, and a bleed-preventing effect against contaminants that do not dissolve in water can be further imparted.

  It does not specifically limit as a crosslinking agent contained in the said curable emulsion coating material composition, According to the curable functional group which the said resin emulsion has, it can select. When the resin emulsion has a carboxylic acid group, the coating composition preferably contains a carbodiimide compound as the crosslinking agent. The said carbodiimide compound is not specifically limited, Specifically, the water-soluble thing and water-dispersible thing which have two or more carbodiimide groups in 1 molecule can be mentioned. Specific examples of the carbodiimide compounds that are commercially available include carbodilite V series (water-soluble type) and E series (emulsion type) (both manufactured by Nisshinbo Industries, Inc.).

  Moreover, when the said resin emulsion has a carbonyl group, it is preferable that the hydrazine compound is included in the coating composition as the said crosslinking agent. The hydrazine compound is not particularly limited, and specifically includes those having two or more hydrazine groups in one molecule, such as oxalic acid dihydrazide, malonic acid dihydrazide, succinic acid dihydrazide, adipic acid dihydrazide, and the like. Can do.

  When the resin emulsion has both a carboxylic acid group and a carbonyl group, the crosslinking agent may be used in combination, but the coating material contains at least a carbodiimide compound as a crosslinking agent. Preferably it is.

  In the curable emulsion coating composition, when the crosslinking agent is included, the content of the crosslinking agent is not particularly limited, and the molar ratio of the resin emulsion to the curable functional group is 1 / 0.8 to 1 /. Preferably it is 1.2. If it is out of the above range, storage stability and water resistance of the resulting coating film may be lowered.

  The weight reducing material contained in the curable emulsion coating composition has a specific gravity of 0.02 or more and 0.5 or less. If it is out of the above range, the stoppage property is deteriorated. The specific gravity is preferably 0.1 or more and 0.4 or less from the viewpoint of preventing bleed bleeding. The lightening material is not particularly limited, and examples thereof include hollow inorganic particles such as glass balloons, ceramic balloons, and shirasu balloons; those using styrene-acrylic copolymers as shell wall materials, and vinylidene chloride copolymers. And hollow organic particles such as those using acrylonitrile copolymer. Moreover, the surface of these particles may be covered with powders such as calcium carbonate, talc, and titanium.

  The lightening material preferably has an average particle size of 5 μm to 60 μm, and more preferably 10 μm to 40 μm. If it is less than 5 μm or exceeds 60 μm, it may be difficult to achieve both the effect of the present invention and the appearance of the obtained coating film.

  Examples of such hollow organic particles that are commercially available include 80GCA, 80GTA, and 30STI (all manufactured by Matsumoto Yushi Seiyaku Co., Ltd.).

  In the curable emulsion coating composition of the present invention, when the lightening material is included, the content of the lightening material is preferably 1% by mass or more and 10% by mass or less based on the solid content of the coating. If it is out of the above range, it may be difficult to achieve both the effect of the present invention and the appearance of the obtained coating film.

  In addition to the above-mentioned components, the curable emulsion coating composition includes an organic solvent, a plasticizer, a filler, a viscosity modifier, an antifoaming agent, a dispersant, an ultraviolet light inhibitor, a light stabilizer, a preservative, and the like. Can be added.

  The curable emulsion coating composition can be obtained by stirring and mixing the above components using an apparatus well known by those skilled in the art, such as a disper or a ball mill.

  The wall surface refurbishing method of the present invention can be carried out without applying a primer such as a sealer for preventing bleeding before applying the curable emulsion coating composition. By doing so, the process can be omitted, which is economical. In addition, when the contamination such as spear is particularly severe, the curable emulsion coating composition can be applied after applying the undercoat.

  The curable emulsion coating composition of the present invention is used in the wall surface remodeling method, and specific examples include those described in the wall surface refurbishing method.

The wall surface coating method of the present invention is characterized in that the above curable emulsion coating composition is applied to a wall surface to form a coating film.
Examples of the wall surface include a room such as a house or office, and an inner wall surface, a ceiling, and an outer wall surface of a vehicle. Examples of the material include concrete, wood, metal, and the like.
Examples of the coating method, the method for obtaining a coating film, the coating amount and the drying time, and the drying temperature in the case of forced drying include those described in the above wall surface remodeling method.

  EXAMPLES Hereinafter, although a specific Example is given and this invention is demonstrated in detail, this invention is not limited by a following example. In the following description, “part” means “part by mass”.

Production Example 1 Production Method of Resin Emulsion In a separable flask equipped with a dropping funnel, a thermometer, a nitrogen inlet tube, a reflux condenser and a stirrer, 34.7 parts of ion-exchanged water, Pelex SS-H (alkyl diphenyl ether disulfone manufactured by Kao Corporation) Sodium acid) 0.5 part was charged, and the temperature was raised to 80 ° C. under a nitrogen atmosphere. Acid value 13 consisting of 30 parts of styrene, 17.5 parts of 2-ethylhexyl acrylate, 32.5 parts of methyl methacrylate, 2 parts of acetoacetoxyethyl methacrylate, 20 parts of butyl acrylate, 1 part of acrylic acid and 1 part of methacrylic acid After adding 0.4 parts of dodecyl mercaptan to the monomer mixture solution, the mixture is added to an aqueous emulsifier solution in which 4.1 parts of PELEX SS-H is dissolved in 25 parts of ion-exchanged water, and emulsified using a mixer. A pre-emulsion was prepared. The pre-emulsion thus obtained and an aqueous initiator solution in which 0.2 part of ammonium persulfate was dissolved in 1.0 part of ion-exchanged water were separated from a separate dropping funnel for 120 minutes for the former and 150 minutes for the latter. The dripping was started. After completion of the dropwise addition, the reaction was continued for an additional 120 minutes at the same temperature. After cooling, it was neutralized with aqueous ammonia. The neutralized product was filtered through a 200-mesh wire mesh to obtain a resin emulsion having an acid value of 13 and a solid content of 55%.

Production Example 2 Production of Substrate A After applying Hi Vinylex 70 (emulsion paint manufactured by Nippon Paint Co., Ltd.) with a wool roller at a coating amount of 0.15 / m ² × 2 on a 100 × 150 mm slate plate, The substrate A was obtained by leaving to dry at room temperature for 30 days.

Production Example 3 Production of Substrate B Substrate A obtained in Production Example 2 was allowed to stand in a desiccator where cigarettes were burned, and the surface of substrate 1 was contaminated with cigarette dust to obtain substrate B. ΔE before standing in the desiccator and after contaminating the surface was 10-14. In addition, (DELTA) E was measured by CR-200 (made by Minolta).

Example 1
100 parts of the resin emulsion obtained in Production Example 1, 18 parts of a film-forming aid, 125 parts of titanium dioxide, 55 parts of heavy calcium carbonate (external pigment manufactured by Maruo Calcium Co., Ltd.) and the acid value and molar ratio of the resin emulsion are 1 A carbodiimide compound was blended so as to be / 1, and sufficiently stirred with a disper. Furthermore, 80GCA (Matsumoto Yushi Seiyaku Co., Ltd. hollow resin particles, specific gravity 0.2, average particle diameter 20 μm) is blended so as to be 8% by mass with respect to the solid content of the paint, and curable emulsion paint composition 1 is obtained. Obtained. The pigment volume concentration of this paint was 72%.

The obtained curable emulsion coating composition 1 was applied to the substrate A obtained in Production Example 2 with a brush at a coating amount of 0.15 Kg / m ² . After leaving for 3 hours, the curable emulsion coating composition 1 was applied under the same conditions and left at room temperature for 24 hours to obtain a test plate A.
Further, a test plate B was obtained in the same manner for the substrate B obtained in Production Example 3.

Comparative Example 1
After obtaining curable emulsion coating composition 2 in the same manner as in Example 1 except that 80GCA was not used, test plate A and test plate B were obtained in the same manner. The pigment volume concentration of this paint was 70%.

Comparative Example 2
After obtaining curable emulsion coating composition 3 in the same manner as in Example 1 except that M-305 (Matsumoto Yushi Seiyaku Co., Ltd. resin particles, specific gravity 1.17, average particle size 15 μm) was used instead of 80GCA. In the same manner, test plate A and test plate B were obtained. The pigment volume concentration of this paint was 71%.

Evaluation Test The following evaluation tests were performed on the test plates A and B. The obtained data are shown in Table 1.

(1) Color difference Color difference ΔE with test plate B was measured using test plate A as a reference plate. The measurement was performed 3 times, and the average value was taken.

(2) Re-bleed prevention For each test plate B, pure water was dropped onto the coating film so as to have a diameter of about 10 mm, and it was visually confirmed whether or not burrs were bleeding at the dropping site.

表１の結果から明らかなように、所定の軽量化材を含んでいる硬化型エマルション塗料組成物を用いた場合は、色差および再ブリード防止性が良好であった（実施例１）。

As is apparent from the results in Table 1, when a curable emulsion coating composition containing a predetermined lightening material was used, the color difference and re-bleeding prevention were good (Example 1).

  However, when a curable emulsion coating composition not containing a predetermined lightening material was used, the color difference and re-bleeding prevention properties were not good (Comparative Examples 1 and 2).

  The wall surface refurbishing method of the present invention is suitable as a method for refurbishing inner wall surfaces, ceilings, outer wall surfaces, and the like contaminated with contaminants such as dust, hand dust, oil smoke, and writing instruments due to cigarette smoke.

Claims (7)

A wall surface refurbishing method for forming a coating film by applying a curable emulsion coating composition to a wall surface,
The curable emulsion paint composition comprises a resin emulsion having a curable functional group, a coloring pigment, a carbodiimide compound and lighter material,
The resin emulsion contains a carboxylic acid group as a curable functional group ,
The light weight material has a specific gravity of 0.02 to 0.5,
A wall refurbishing method characterized by that.   The wall surface refurbishing method according to claim 1, wherein the surface of the wall surface has a cloth, wallpaper, or a coating film formed thereon.   The wall surface refurbishing method according to claim 1 or 2, wherein the content of the lightening material is 1 to 10% by mass.   The wall surface refurbishing method according to claim 1, wherein the lightening material is hollow resin particles.   The wall surface refurbishing method according to any one of claims 1 to 4, wherein the color pigment contains 60 to 200% in terms of pigment volume concentration.   A curable emulsion coating composition for use in the wall surface refurbishing method according to any one of claims 1 to 5.   A wall surface coating method comprising applying a curable emulsion coating composition according to claim 6 to a wall surface to form a coating film.