JP5176252B2 - Improvement of water-containing coating composition containing lime - Google Patents

Description

  The present invention relates to an improvement of a non-water-curable water-containing coating composition containing lime as a film component. More specifically, regarding a non-water-curable water-containing coating composition containing lime as a film component, a method for improving fluidity, a method for improving adhesion to a substrate, a method for uniformly stabilizing adhesion, and crack resistance It is related with the improvement method.

  Stucco and dolomite plaster have been known for a long time as an air-hard (non-water curable) coating material mainly composed of lime. These coating materials have excellent functions such as moisture control (hygroscopicity and moisture release), antifungal properties, antibacterial properties, deodorizing properties, and fireproofing properties in addition to a calm and solid finish. Now that the syndrome is a problem, it is being reviewed again as a coating material for improving the environment.

  However, plaster and dolomite plaster have the disadvantages that they are large in shrinkage at the time of drying and curing and are liable to crack. In particular, cracking is likely to occur because the drying shrinkage rate increases when thickly applied. For this reason, conventional plaster and dolomite plaster have a thickness of 1 to 2 mm or less, using a material containing fiber materials such as sasa (thin cut, hemp, paper, etc. cut short) to prevent cracking. An application method is employed in which thin coating, once drying and curing, and then top coating from the top are repeated to finish to a desired thickness. Furthermore, in order to prevent cracking, a high level of craftsmanship is required to average the drying shrinkage of the film while adjusting the pressing degree of the iron during overcoating. For this reason, the construction of plaster and dolomite plaster required a skillful technique and a long construction period, and as a result, there was a problem that the cost was great. Moreover, since lime has a high thixotropic flow characteristic, there is a problem that the flowability is poor and the aqueous dispersion is agglomerated if it is left standing for a certain period.

  For these reasons, lime-based coating materials such as plaster and dolomite plaster are mainly left to wet construction (on-site construction) by human hands.

By the way, as a method conventionally proposed as a method for preventing cracking of plaster and dolomite plaster, for example, as a coating composition, lime-based containing slaked lime and / or dolomite plaster, styrene butadiene rubber latex, welan gum and a surfactant. A method using a plaster composition (Patent Document 1), a method using a composition containing silica sand, synthetic resin, soot, clay component, dispersant, cellulosic thickener and antifoaming agent in a specific ratio to slaked lime ( Patent Document 2), a method of using a composition containing aggregate, synthetic resin binder, and wheat fiber at a specific ratio in slaked lime (Patent Document 3), lime-based plaster, ethylenically unsaturated dicarboxylic acid monomer and A lime-based plastic compounded with a lime-based plaster modifier containing latex obtained by emulsion polymerization of vinyl monomers. Examples include a method of using a star composition (Patent Document 4) and a method of adding a compound having a chelating action to calcium ions (chelate compound) (Patent Document 5) in a coating composition containing lime as a film component. be able to.
Among them, the method described in Patent Document 5 is effective in preventing cracking of a film formed from a coating composition containing lime such as plaster and dolomite plaster, lime-based finish coating material, lime-based paint, and the like. In addition to being excellent, it is useful as a method for reducing the thixotropic flow properties of lime.

However, in order to use such a coating composition containing lime as a film component for coating on an industrial line, it must have fluidity suitable for an industrial coating machine such as a flow coater. It is also necessary to have crack resistance (crack resistance) that can withstand forced drying on industrial lines.
JP 2003-171167 A JP 2001-192255 A JP 2003-306614 A JP 2002-12460 A JP 2006-240981 A

  The present invention is a coating composition containing lime and water, which is excellent in fluidity and dispersibility in addition to the crack resistance of the film, particularly suitable for coating on an industrial line using a flow coater or the like. It is an object of the present invention to provide an improved coating composition that can be used in the present invention. More specifically, the present invention is directed to a non-water-curable water-containing coating composition containing lime as a film component, a method for improving fluidity, an improved adhesion to a substrate, and a uniform adhesion. It aims at providing the method of aiming at stabilization, and the method of improving crack resistance.

  The inventor has conducted extensive research day and night in order to achieve the above object. By blending a water-containing coating composition containing lime as a film component with a polar amino acid, an amino acid polymer, or a salt thereof. The present inventors have found that the fluidity and dispersibility of the water-containing coating composition are improved, and that a viscosity that is apparently opposite to the fluidity is generated, so that the formed film is hardly cracked. Further, the present inventor has improved the adhesion to the object to be coated (base material) due to the occurrence of viscosity, and combined with the improvement in dispersibility, provides a uniform and stable adhesion to the surface of the object to be coated. The present inventors have found that the coating film can be formed, and further, due to the fluidity and appropriate viscosity, the curtain breakage hardly occurs when applied to a flow coater which is an industrial coating machine. Therefore, according to the above technique, the present inventor can apply a water-containing coating composition containing lime as a film component to a flow coater or the like to perform mass coating on an industrial line, that is, lime. It was confirmed that a boat or a sheet as a coating layer can be manufactured industrially. The present invention has been developed based on such knowledge.

The present invention includes the following embodiments I to VIII:
I. Non-water-curable water-containing coating composition (I-1) (a) lime, (b) water, and (c) at least one selected from the group consisting of polar amino acids, polar amino acid polymers and salts thereof A coating composition comprising:
(I-2) The coating composition according to (I-1), wherein the polar amino acid or the polar amino acid polymer has a hydrophobic index of −0.5 or less.
(I-3) The coating composition according to (I-1), wherein the polar amino acid or the polar amino acid polymer has a hydrophobic index of −3 or less.
(I-4) The coating composition according to any one of (I-1) to (I-3), wherein the polar amino acid or the polar amino acid constituting the polar amino acid polymer is an acidic or basic amino acid.
(I-5) The coating composition according to any one of (I-1) to (I-3), wherein the polar amino acid or the polar amino acid constituting the polar amino acid polymer is an acidic amino acid.
(I-6) The polar amino acid or polar amino acid constituting the polar amino acid polymer is selected from the group consisting of glutamic acid, aspartic acid, lysine, arginine, histidine, asparagine, glutamine, serine, threonine, tyrosine, tryptophan, and proline. The coating composition according to (I-1) or (I-2), which is at least one of
(I-7) The coating composition according to any one of (I-1) to (I-6), further comprising (d) a chelate compound.
(I-8) The coating composition according to (I-7), wherein the chelate compound is an organic chelate compound or an inorganic chelate compound having a molecular weight of 1000 or less.
(I-9) The organic chelate compound is at least one selected from the group consisting of a carboxylic acid chelate compound, a phosphonic acid chelate compound, a phosphoric acid chelate compound, a sulfonic acid chelate compound and a reducing organic acid chelate compound. The coating composition according to (I-8), which is a seed. (I-10) The coating composition according to any one of (I-7) to (I-9), wherein the chelate compound is a chelate compound having a molecular weight of 600 or less.
(I-11) The coating composition according to any one of (I-7) to (I-10), further comprising (e) a silicon compound.
(I-12) The coating composition according to (I-11), wherein the silicon compound is at least one selected from the group consisting of zeolite, silica, diatomaceous earth, fly ash, sepiolite, sodium silicate, and sodium metasilicate. object.
(I-13) The coating composition according to any one of (I-1) to (I-12), further comprising (f) a binder.
(I-14) The coating composition as described in any one of (I-1) to (I-13), further comprising (g) a white pigment.
(I-15) The coating composition according to any one of (I-1) to (I-14), further comprising (h) an aggregate.
(I-16) The coating composition according to any one of (I-1) to (I-14), wherein the coating composition is a paint, a coating material, a sealer, a primer, or an adhesive.
(I-17) The coating composition according to any one of (I-1) to (I-16), which is a coating composition used for painting with an industrial coating machine.
(I-18) The coating composition according to (I-17), wherein the industrial coating machine is a spray, flow coater, roll coater, or vacuum coater, preferably a flow coater.

II. Coating composition package (II-1) A coating composition package comprising the coating composition described in any one of (I-1) to (I-18) above in a container.
(II-2) The coating composition package according to (II-1), wherein the container is a flexible container.

III. Method for producing coating composition for industrial coating machine (III-1) (a) Film component containing lime, and (c) At least one selected from the group consisting of polar amino acids, polar amino acid polymers and salts thereof And (b) a method for producing a coating composition exclusively for a coating machine, which comprises a step of mixing with water to prepare a liquid or paste.
(III-2) The production method according to (II-1), wherein the polar amino acid or the polar amino acid polymer has a hydrophobic index of −0.5 or less.
(III-3) The production method according to (II-1), wherein the polar amino acid or the polar amino acid polymer has a hydrophobic index of −3 or less.
(III-4) The production method according to any one of (III-1) to (III-3), wherein the polar amino acid or the polar amino acid constituting the polar amino acid polymer is an acidic or basic amino acid.
(III-5) The production method according to any one of (III-1) to (III-3), wherein the polar amino acid or the polar amino acid constituting the polar amino acid polymer is an acidic amino acid.
(III-6) The polar amino acid or the polar amino acid constituting the polar amino acid polymer is selected from the group consisting of glutamic acid, aspartic acid, lysine, arginine, histidine, asparagine, glutamine, serine, threonine, tyrosine, tryptophan, and proline. The production method according to (III-1) or (III-2), which is at least one of the above.
(III-7) The production method according to any one of (III-1) to (III-6), further comprising (d) a chelate compound.
(III-8) The production method according to (III-7), wherein the chelate compound is an organic chelate compound or an inorganic chelate compound having a molecular weight of 1000 or less.
(III-9) The organic chelate compound is at least one selected from the group consisting of a carboxylic acid chelate compound, a phosphonic acid chelate compound, a phosphoric acid chelate compound, a sulfonic acid chelate compound and a reducing organic acid chelate compound. The production method according to (III-8), which is a seed. (III-10) The production method according to any one of (III-7) to (III-9), wherein the chelate compound is a chelate compound having a molecular weight of 600 or less.
(III-11) The production method according to any one of (III-7) to (III-10), further comprising (e) a silicon compound.
(III-12) The production method according to (III-11), wherein the silicon compound is at least one selected from the group consisting of zeolite, silica, diatomaceous earth, fly ash, sepiolite, sodium silicate, and sodium metasilicate. .
(III-13) The production method according to any one of (III-1) to (III-12), further comprising (f) a binder.
(III-14) The production method according to any one of (III-1) to (III-13), further comprising (g) a white pigment.
(III-15) The production method according to any one of (III-1) to (III-14), further comprising (h) an aggregate.
(III-16) The production method according to any one of (III-1) to (III-15), wherein the coating composition is a paint, a coating material, a sealer, a primer, or an adhesive.
(III-17) The production method according to any one of (III-1) to (III-16), wherein the industrial coating machine is a spray, flow coater, roll coater, or vacuum coater, preferably a flow coater.

IV. Board or sheet and board or sheet having a coating layer formed from the coating composition according to any one of (I-1) to (I-18) on the surface of the substrate (IV-1) and the production method thereof (IV-1) .
(IV-2) having a coating layer formed from the coating composition described in any of (I-1) to (I-18) on the surface of the base material, and a protective sheet laminated on the surface of the coating layer The board or sheet according to (IV-1), wherein
(IV-3) The board according to (IV-1), comprising a step of applying the coating composition according to any one of (1) (I-1) to (I-18) to the surface of the substrate Sheet manufacturing method.
(IV-4) (1) a step of applying the coating composition according to any one of (I-1) to (I-18) on the surface of the substrate, and (2) a coating formed from the composition The method for producing a board or sheet according to (IV-2), comprising a step of laminating a protective sheet on the surface of the layer.

V. Method for improving fluidity of water-containing coating composition containing lime as film component (V-1) (c) Mixing at least one selected from the group consisting of polar amino acids, polar amino acid polymers and salts thereof A method for improving the fluidity of a coating composition containing (a) lime and (b) water.
(V-2) The fluidity improving method according to (V-1), wherein the polar amino acid or the polar amino acid polymer has a hydrophobic index of −0.5 or less.
(V-3) The fluidity improving method according to (V-1), wherein the polar amino acid or the polar amino acid polymer has a hydrophobic index of −3 or less.
(V-4) The fluidity improving method according to any one of (V-1) to (V-3), wherein the polar amino acid or the polar amino acid constituting the polar amino acid polymer is an acidic or basic amino acid.
(V-5) The fluidity improving method according to any one of (V-1) to (V-3), wherein the polar amino acid or the polar amino acid constituting the polar amino acid polymer is an acidic amino acid.
(V-6) The polar amino acid or polar amino acid constituting the polar amino acid polymer is selected from the group consisting of glutamic acid, aspartic acid, lysine, arginine, histidine, asparagine, glutamine, serine, threonine, tyrosine, tryptophan, and proline. The fluidity improving method according to (V-1) or (V-2), which is at least one of the above.
(V-7) The fluidity improving method according to any one of (V-1) to (V-6), further comprising (d) a chelate compound.
(V-8) The fluidity improving method according to (V-7), wherein the chelate compound is an organic chelate compound or an inorganic chelate compound having a molecular weight of 1000 or less.
(V-9) The organic chelate compound is at least one selected from the group consisting of a carboxylic acid chelate compound, a phosphonic acid chelate compound, a phosphoric acid chelate compound, a sulfonic acid chelate compound and a reducing organic acid chelate compound. The fluidity improving method according to (V-7), which is a seed. (V-10) The fluidity improving method according to any one of (V-7) to (V-9), wherein the chelate compound is a chelate compound having a molecular weight of 600 or less.
(V-11) The fluidity improving method according to any one of (V-1) to (V-10), further comprising (g) a white pigment.
(V-12) The coating composition further includes at least one selected from the group consisting of (f) a binder, (h) an aggregate, and (e) a silicon compound. -11).

VI. Method for improving adhesion or uniformly stabilizing adhesion of water-containing coating composition containing lime as film component (VI-1) (c) At least selected from the group consisting of polar amino acids, polar amino acid polymers and salts thereof A method for improving the adhesion of a coating composition containing (a) lime and (b) water to a substrate or uniformly stabilizing the adhesion, which comprises blending one kind.
(VI-2) The method for improving adhesion or uniformly stabilizing adhesion described in (VI-1), wherein the polar amino acid or the polar amino acid polymer has a hydrophobic index of −0.5 or less.
(VI-3) The method for improving adhesion or uniformly stabilizing adhesion described in (VI-1), wherein the polar amino acid or the polar amino acid polymer has a hydrophobic index of -3 or less.
(VI-4) The adhesion property improvement or attachment according to any one of (VI-1) to (VI-3), wherein the polar amino acid or the polar amino acid constituting the polar amino acid polymer is an acidic or basic amino acid Uniform stabilization method of the wearing force.
(VI-5) Adhesive force improvement or uniform adhesive force according to any one of (VI-1) to (VI-3), wherein the polar amino acid or the polar amino acid constituting the polar amino acid polymer is an acidic amino acid Stabilization method.
(VI-6) The polar amino acid or the polar amino acid constituting the polar amino acid polymer is selected from the group consisting of glutamic acid, aspartic acid, lysine, arginine, histidine, asparagine, glutamine, serine, threonine, tyrosine, tryptophan, and proline. The method for improving adhesive force or uniformly stabilizing adhesive force according to (VI-1) or (VI-2), which is at least one of the above.
(VI-7) The method for improving adhesive force or uniformly stabilizing adhesive force according to any one of (VI-1) to (VI-6), further comprising (d) a chelate compound.
(VI-8) The method for improving adhesion or uniformly stabilizing adhesion described in (VI-7), wherein the chelate compound is an organic chelate compound or an inorganic chelate compound having a molecular weight of 1000 or less.
(VI-9) The organic chelate compound is at least one selected from the group consisting of a carboxylic acid chelate compound, a phosphonic acid chelate compound, a phosphoric acid chelate compound, a sulfonic acid chelate compound, and a reducing organic acid chelate compound. The method for improving adhesion or uniformly stabilizing adhesion as described in (VI-8), which is a seed. (VI-10) The method for improving adhesive force or uniformly stabilizing adhesive force according to any one of (VI-7) to (VI-9), wherein the chelate compound is a chelate compound having a molecular weight of 600 or less.
(VI-11) The method of improving adhesive force or uniformly stabilizing adhesive force according to any one of (VI-1) to (VI-10), wherein the coating composition further comprises (f) a binder.
(VI-12) The method for improving adhesive force or uniformly stabilizing adhesive force according to any one of (VI-1) to (VI-11), wherein the coating composition further comprises (e) a silicon compound.
(VI-13) The method of improving adhesive force or uniformly stabilizing adhesive force according to any one of (VI-1) to (VI-12), wherein the coating composition further comprises (g) a white pigment.
(VI-14) It was formed from a coating composition whose adhesion to the substrate was improved by the method described in any of (VI-1) to (VI-13) above, or whose adhesion was uniformly stabilized. A coating having a film.
(VI-15) The covering according to (VI-14), wherein the covering having the film is a board or a sheet.

VII. Method for improving crack resistance of coating composition containing lime as film component (VII-1) (c) blending at least one selected from the group consisting of polar amino acids, polar amino acid polymers and salts thereof A method for improving the crack resistance of a coating composition containing (a) lime and (b) water, which is characterized by the following.
(VII-2) The crack resistance improving method according to (VII-1), wherein the polar amino acid or the polar amino acid polymer has a hydrophobic index of −0.5 or less.
(VII-3) The crack resistance improving method according to (VII-1), wherein the polar amino acid or the polar amino acid polymer has a hydrophobic index of −3 or less.
(VII-4) The crack resistance improving method according to any one of (VII-1) to (VII-3), wherein the polar amino acid or the polar amino acid constituting the polar amino acid polymer is an acidic or basic amino acid .
(VII-5) The method for improving crack resistance according to any one of (VII-1) to (VII-3), wherein the polar amino acid or the polar amino acid constituting the polar amino acid polymer is an acidic amino acid.
(VII-6) The polar amino acid or the polar amino acid constituting the polar amino acid polymer is selected from the group consisting of glutamic acid, aspartic acid, lysine, arginine, histidine, asparagine, glutamine, serine, threonine, tyrosine, tryptophan, and proline. The crack resistance improving method according to (VII-1) or (VII-2), which is at least one of the above.
(VII-7) The crack resistance improving method according to any one of (VII-1) to (VII-6), further comprising (d) a chelate compound.
(VII-8) The method for improving crack resistance according to (VII-7), wherein the chelate compound is an organic chelate compound or an inorganic chelate compound having a molecular weight of 1000 or less.
(VII-9) The organic chelate compound is at least one selected from the group consisting of a carboxylic acid chelate compound, a phosphonic acid chelate compound, a phosphoric acid chelate compound, a sulfonic acid chelate compound and a reducing organic acid chelate compound. The method for improving crack resistance according to (VII-8), which is a seed. (VII-10) The method for improving crack resistance according to any one of (VII-7) to (VII-9), wherein the chelate compound is a chelate compound having a molecular weight of 600 or less.
(VII-11) The method for improving crack resistance according to any one of (VII-1) to (VII-10), wherein the coating composition further comprises (f) a binder.
(VII-12) The method for improving crack resistance according to any one of (VII-1) to (VII-11), wherein the coating composition further comprises (e) a silicon compound.
(VII-13) A coating having a crack resistant film formed from a coating composition having improved crack resistance by the method described in any one of (VII-1) to (VII-12) above.
(VII-14) The coating according to (VII-13), wherein the coating having the film is a board or a sheet.

VIII. Use of polar amino acids (VIII-1) Group (c) Polar amino acids, polar amino acid polymers and salts thereof for improving the fluidity of coating compositions containing (a) lime and (b) water Use of at least one selected from
(VIII-2) (c) Polar amino acids, polar amino acid polymers and their compounds for improving the adhesion of the coating composition containing (a) lime and (b) water and stabilizing the adhesion uniformly At least one selected from the group consisting of:
(VIII-3) selected from the group consisting of (c) polar amino acids, polar amino acid polymers and salts thereof for improving the crack resistance of coating compositions containing (a) lime and (b) water At least one use.
(VIII-4) selected from the group consisting of (c) polar amino acids, polar amino acid polymers and their salts for the production of coating compositions for industrial coating machines containing (a) lime and (b) water At least one use.
(VIII-5) selected from the group consisting of (c) polar amino acids, polar amino acid polymers and salts thereof for the production of coating compositions for industrial coating machines containing (a) lime and (b) water And (d) a chelate compound.
(VIII-6) Use according to (VII-4) or (VII-5), wherein the industrial coating machine is a spray, flow coater, roll coater or vacuum coater, preferably a flow coater.
(VIII-7) The coating composition containing (a) lime and (b) water further contains (f) a binder, (VIII-1) to (VIII-6) Use to describe.
(VIII-8) The polar amino acid or the polar amino acid constituting the polar amino acid polymer has a hydrophobicity index of −0.5 or less, and is any one of (VIII-1) to (VIII-7) Use to.
(VIII-9) The polar amino acid or the polar amino acid constituting the polar amino acid polymer is selected from the group consisting of glutamic acid, aspartic acid, lysine, arginine, histidine, asparagine, glutamine, serine, threonine, tyrosine, tryptophan, and proline. The use according to any one of (VIII-1) to (VIII-8), which is at least one of

  (1) By blending a water-containing coating composition containing lime as a film component with a polar amino acid, an amino acid polymer or a salt thereof (hereinafter collectively referred to as “polar amino acids”), Viscosity is generated in the coating composition, and the adhesion to the substrate that is the object to be coated is improved, and the formed film can be given resistance to cracking (cracking resistance). In addition, by adding polar amino acids to a water-containing coating composition containing lime as a film component, the fluidity, which is apparently opposite to the above-mentioned viscosity, is improved and further dispersed in solid water such as lime. Improves. From these, the following can be specifically mentioned as the effects of the present invention.

  (1-1) A film having excellent durability can be formed by improving the adhesion to the base material (the tensile strength of the film to the base material). When the water-containing coating composition is a composition containing a binder, the coating composition, particularly as a paint, coating material, sealer, primer, or adhesive, exhibits more desirable adhesion to the substrate. Can do.

  (1-2) In addition to the above characteristics, by improving water dispersibility, it is possible to form a film having a uniform and stable adhesion to an object to be coated (base material).

  (1-3) Since a viscous water-containing coating composition can be obtained, a conventional non-water-curable coating composition containing lime as a film component (such as plaster, dolomite plaster, lime-based finish coating material, and lime-based paint) It is possible to significantly suppress cracking of the coating film during drying, which has been a problem with respect to. Moreover, since forced drying is possible, the board and sheet | seat which use the coating composition of this invention as a coating layer can be manufactured with an industrial coating line.

  (1-4) Since a water-containing coating composition with excellent fluidity and moderate viscosity can be obtained, it can be suitably applied to a flow coater that coats the object to be coated by pouring paint, etc. from a narrow slit into a curtain. be able to. That is, according to the water-containing coating composition of the present invention, boards and sheets having this as a coating layer can be produced industrially in large quantities using an industrial coating machine such as a flow coater.

  (2) Furthermore, the following can be mentioned as an effect by mix | blending a chelate compound.

  (2-1) By adding a chelate compound in addition to the above polar amino acids to a water-containing coating composition containing lime as a film component, adhesion, crack resistance and fluidity are further improved, and slaked lime The thixotropy is relaxed, re-aggregation is suppressed when the coating composition is stored, and fluidity and softness can be stably maintained.

  (2-2) In addition to the above polar amino acids, a chelating compound is added to a water-containing coating composition containing lime as a film component, thereby suppressing a pozzolanic reaction when a silicon compound is used in combination. For this reason, the water-containing coating composition of the present invention containing a chelate compound contains a silicon compound such as diatomaceous earth, silica, zeolite, fly ash, sepiolite, and water glass without impairing its fluidity and storage stability. Substances can be blended freely.

I. Non -water-curable water-containing coating composition The non-water-curable water-containing coating composition of the present invention is a water-containing coating composition containing lime as a film component, and the above component (a) lime and ( b) In addition to water, it contains (c) at least one selected from the group consisting of polar amino acids, polar amino acid polymers and salts thereof.

  Here, “non-water curable” means that the coating composition does not solidify in the presence of water, in other words, it can be stored in a state where it can be used for coating (painting / coating) while containing water. Means. In more detail, coating materials (paints, coating materials, sealers (base treatment materials), as they are after storage, or if necessary, with a little stirring and kneading, or by adding a small amount of water and mixing) Means that it can be used as a primer, an adhesive, and the like. In this sense, the water-containing coating composition of the present invention is distinguished from a composition containing a hydraulic substance such as cement and gypsum and having a property of solidifying in the presence of water.

  A “water-containing coating composition” is a composition that forms a film by being applied, applied, or sprayed onto an object. Specifically, paints, coating materials, sealers, primers, adhesives, etc. Can be mentioned without limitation. Preferred are paints and coating materials used as finishing materials or cosmetic materials. Among them, it is preferable to use a ceiling or inner / outer wall of a building; a building member such as a cloth, a board or a panel; a textile product such as a curtain, a carpet, a chair-tensioned land, a car seat cover, an insole, or an insole; Furniture such as wall, chest, desk, bookcase and shoe cabinet, water furniture such as sink and washbasin, office equipment such as partition, bookcase and desk, or these parts; tunnel wall, guardrail material, sound insulation wall material, protective wall Examples thereof include paints, coating materials, sealers, primers, or adhesives used for foundations or finishing or coating of materials, civil engineering members such as bridge structures; Although not limited, coating compositions containing lime as a coating component include plaster, dolomite plaster, lime-based finish coating material, lime-based paint, slaked lime / dolomite plaster system thin finish coating material, slaked lime / dolomite plaster thickness. Includes finish finish.

Specific examples of (a) lime include quick lime whose main component is calcium oxide and slaked lime whose main component is calcium hydroxide. In addition, as these lime, the recycled lime reproduced | regenerated from waste materials, such as industrial lime, salt-baked lime, shellfish ash (shellfish ash), and a construction and civil engineering member, can also be used. These limes may be used alone or in combination of two or more. Preferably, it is a slaked lime which is an air-hard material and is a main raw material for plaster and dolomite plaster. Here, quick lime means lime containing calcium oxide as the main component, and slaked lime means lime containing calcium hydroxide, and as long as other components, calcium carbonate (calcite, aragonite, vaterite) , The presence of precipitated calcium carbonate such as basic calcium carbonate and amorphous calcium carbonate, heavy calcium carbonate) and dolomite (CaMg (CO ₃ ) ₂ ) is not particularly disturbed. The slaked lime may contain quick lime (calcium oxide) as another component, and the quick lime may contain slaked lime (calcium hydroxide) as another component. Therefore, the water-containing coating composition of the present invention is mainly composed of magnesium hydroxide and calcium hydroxide (slaked lime), which is produced by calcination of slaked lime with slaked lime as the main component, calcination of dolomite and the action of water. Includes those containing dolomite plaster tempered with water.

  The proportion of the lime to be blended in the water blended coating composition is not particularly limited, but is appropriately selected from the range of usually 3 to 95 wt% as the blending ratio of lime per 100 wt% solid content of the water blended coating composition. can do. Examples of the lower limit of the lime mixing ratio include 3% by weight, 5% by weight, 10% by weight, 15% by weight, 20% by weight, 25% by weight, 30% by weight, 35% by weight, and 40% by weight. In order to prepare a coating composition that takes advantage of the excellent functions of lime (antifungal, antibacterial, deodorant, humidity control), a certain amount of lime is required. Can be 5% by weight, preferably 10% by weight, more preferably 15% by weight. Moreover, as an upper limit, 80 weight%, 75 weight%, 70 weight%, 65 weight%, or 60 weight% can be mentioned. A more specific blending ratio is not limited, but is 15 to 75% by weight, preferably 20 to 70% by weight, more preferably 25 to 70% by weight, further preferably 30 to 65% by weight, and still more preferably 30 to 65% by weight. 60% by weight can be exemplified.

  The proportion of (b) water blended in the coating composition of the present invention is not particularly limited. Preferably, it can be appropriately selected from a range in which water is contained at a ratio of 10 to 70% by weight per 100% by weight of the water-containing coating composition. In this case, the water-containing coating composition is prepared so that the solid content is 30 to 90% by weight. More specifically, for example, a water-containing coating composition is sprayed, roller or brushed, or in liquid or slurry form (so-called paint form) suitable for industrial coating machines (spray, flow coater, roll coater, vacuum coater, etc.) Although it does not restrict | limit, it can prepare so that water may be contained in the ratio of 30 to 60 weight%, Preferably it is 35 to 50 weight%. Further, when the water-containing coating composition is prepared in a paste form suitable for glazing (so-called coating material form), the ratio is 10 to 40% by weight, preferably 20 to 35% by weight, although not limited. Can be prepared. The (c) polar amino acid or polar amino acid polymer used in the present invention is not particularly limited as long as it is a polar amino acid or amino acid polymer. However, these polar amino acids targeted by the present invention do not include compounds having an ion sequestering ability (chelating compounds) for capturing or sequestering metal ions such as calcium ions based on chelating action. The presence or absence and degree of polarity of amino acids can generally be evaluated using the hydrophobicity index (Kyte and Doolittle, J. Mol. Biol., 157, 105-132 (1982)). Specifically, if the hydrophobicity index is less than 0 (that is, a negative value), it can be defined as an amino acid having polarity. The greater the absolute value of the hydrophobicity index less than 0, the greater the degree of polarity. growing. The polar amino acid or polar amino acid polymer used in the present invention usually has a hydrophobicity index of -0.5 or less, preferably a hydrophobicity index of -1 or less, more preferably -3 or less. The lower limit of the hydrophobic index is not particularly limited, but can be −5, preferably −4.5.

  The amino acids targeted by the present invention are not limited to protein-constituting amino acids but also include other amino acids. For example, protein-constituting amino acids having a hydrophobicity index (HI) in the range of -0.5 to -1 are taken as examples. And threonine (HI: -0.7), serine (HI: -0.8), and tryptophan (HI: -0.9). Further, when protein-constituting amino acids having a hydrophobic index (HI) in the range of −1 to −3 are exemplified, tyrosine (HI: -1.3) and proline (HI: -1.6) can be exemplified. In addition, when protein-constituting amino acids having a hydrophobicity index (HI) of −3 or less are taken as examples, glutamic acid (HI: -3.5), aspartic acid (HI: -3.5) [above, acidic amino acid], glutamine (HI:- 3.5), asparagine (HI: -3.5) [more, neutral amino acid], histidine (HI: -3.2), lysine (HI: -3.9), and arginine (HI: -4.5) [more, basic amino acid] Can be mentioned.

  These amino acids can be used in a free state or in a salt form, but acidic or basic amino acids such as aspartic acid, glutamic acid, histidine, arginine, and lysine are preferably used in a salt form. Examples of such salts include salts with alkali metals such as potassium and sodium and salts with alkaline earth metals such as magnesium and calcium aspartic acid and glutamic acid. Examples of histidine, arginine, and lysine include salts with inorganic acids such as hydrochloric acid, nitric acid, sulfuric acid, and phosphoric acid; salts with organic acids such as tartaric acid, malic acid, citric acid, and ascorbic acid. Preferably salts of polar acidic amino acids such as glutamic acid and aspartic acid (for example, salts with alkali metals such as sodium glutamate and sodium aspartate) or salts of polar basic amino acids such as arginine and lysine (eg arginine / hydrochloric acid) And salts with inorganic acids such as lysine and hydrochloride).

  The polar amino acid polymer targeted by the present invention is an amino acid polymer having polarity as a whole, and any polymer consisting of two or more different amino acids may be used as long as it is a polymer consisting of the same amino acid. There may be. Polymers composed of the above polar amino acids are preferred, and examples thereof include polymers composed of the same polar amino acids such as polyaspartic acid, polyglutamic acid, polylysine and polyarginine. These polymers are not limited, but those having a molecular weight of 50,000 or less, preferably 20,000 or less, more preferably 10,000 or less, particularly preferably 5000 or less, and still more preferably 2000 or less are preferred. These polymers can also be used in the form of a salt. For example, polyaspartic acid or polyglutamic acid is a salt with an alkali metal such as potassium or sodium, or a salt with an alkaline earth metal such as magnesium or calcium. In addition, polylysine and polyarginine can be used in the form of a salt with an inorganic acid such as hydrochloric acid or a salt with an organic acid such as citric acid or ascorbic acid.

These polar amino acids, polar amino acid polymers or salts thereof (polar amino acids) can be used singly or in combination of two or more.
The ratio of the polar amino acids compounded in the water-containing coating composition of the present invention is not particularly limited as long as the effects of the present invention are exhibited, and the type of lime contained in the water-containing coating composition and the usage of the coating composition (For example, thin coating or thick coating) and coating method (spray coating, trowel coating, roller coating, brush coating, etc.) It can be suitably selected from the range of usually 0.001 to 10% by weight per 100% by weight of the coating composition. Preferably it is 0.01 weight% or more, More preferably, it is 0.05 weight% or more. The effect of these polar amino acids increases as the blending amount increases, so the upper limit is not particularly limited, but is preferably 8% by weight, more preferably 5% by weight, up to 10% by weight from an economic standpoint. Can be exemplified. In addition to the above (a) lime, (b) water and (c) polar amino acids, the coating composition of the present invention may contain (d) a chelate compound.

  The chelate compound used here is a compound (ion sequestering agent) having an ion sequestering ability for capturing or sequestering metal ions such as calcium ions based on the chelate action, and particularly if it has such action There is no limit. Usually, it is a low molecular weight chelate compound having a molecular weight of 2000 or less, preferably 1000 or less, more preferably 700 or less, further preferably 600 or less, still more preferably 500 or less, and particularly preferably about 50 to 450.

  Examples of such chelate compounds include organic chelate compounds such as carboxylic acid chelate compounds, phosphonic acid chelate compounds, phosphoric acid chelate compounds, sulfonic acid chelate compounds, and reducing organic acid chelate compounds; silicates and phosphates. And inorganic chelate compounds such as sulfates. These chelate compounds are all well known to those skilled in the art.

  Although not limited, carboxylic acid-based chelate compounds include oxalic acid, propionic acid, spiculisporic acid, succinic acid, fumaric acid, maleic acid, phthalic acid, malonic acid, itaconic acid, acrylic acid, methacrylic acid. Carboxylic acids such as acids, aminoacetic acids and their isomers or their salts; citric acid, isocitric acid, tartaric acid, gluconic acid, heptogluconic acid, hydroxymalonic acid, lactic acid, malic acid, glycolic acid, glucuronic acid, β-D- Hydroxycarboxylic acids or salts thereof such as glucopyranuronic acid, salicylic acid, mandelic acid, glucoheptanoic acid, arabonic acid, and isomers thereof; nitrile triacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA), ethylenediaminesuccinic acid, diethylenetriaminopenta Acetic acid (DTPA), triethylenetetramine hexaacetic acid ( TTHA), L-glutamic acid diacetic acid (GLDA), L-aspartic acid diacetic acid (ASDA), 1,3-propanediaminetetraacetic acid (PDTA), dimercaptol succinic acid (DMSA), and methylglycine diacetic acid ( MGDA) and other aminocarboxylic acids or salts thereof; dihydroxyethylglycine (DEG), triethanolamine (TEA), N- (2-hydroxyethyl) iminodiacetic acid (HEIDA), hydroxyethylethylenediaminetriacetic acid (HEDTA), dihydroxy Hydroxyaminocarboxylic acids or salts thereof such as ethylethylenediaminediacetic acid (DHEDDA) and 1,3-diamino-2-hydroxypropanetetraacetic acid (DPTA-OH); carboxymethyltartronic acid (CMT), and carboxymethyloxy And ether carboxylic acids such as acids (CMOS) or salts thereof. In addition, the compound which becomes free | released in water and becomes said carboxylic acid, for example, the glucono delta lactone or its salt which becomes free | released in water and becomes gluconic acid is also contained in the carboxylic acid type chelate compound said by this invention.

  Examples of phosphonic acid-based chelate compounds include phytic acid, aminomethylenephosphonic acid (NMP), aminotrimethylphosphonic acid (NTMP), methylenephosphonic acid, hydroxyethanediphosphonic acid such as 1-hydroxyethylidene-1,1-diphosphonic acid ( HEDP), phosphonocarboxylic acid derivatives such as phosphonobutanetricarboxylic acid (PBTC), aminotri (methylenephosphonic acid), ethylenediaminetetra (methylenephosphonic acid) (EDTMP), diethylenetriaminepenta (methylenephosphonic acid), hexamethylenediaminetetra ( Mention may be made of methylenephosphonic acid), nitrilotris (methylenephosphonic acid) (NTMP), and salts thereof.

  Examples of the sulfonic acid-based chelate compound include dimercaptopropanol sulfonic acid (DMPS) or a salt thereof.

  Examples of the reducing organic acid chelate compound include organic acids having reducibility (antioxidant action) such as citric acid, isocitric acid, malic acid, ascorbic acid and erythorbic acid, and salts thereof.

  Examples of inorganic chelate compounds include silicates such as sodium metasilicate, sodium sesquisilicate, and sodium orthosilicate; phosphates such as sodium orthophosphate, sodium phosphopyrophosphate, sodium tripolyphosphate, sodium tetraphosphate, and sodium hexametaphosphate; sodium sulfate And sulfates such as sulfamic acid. Preferred is a phosphate. Silicates are preferably used in combination with other inorganic chelate compounds or organic chelate compounds.

  The salts of the various compounds listed above include alkali metal salts such as sodium salts and potassium salts; alkaline earth metal salts such as magnesium salts, calcium salts, and strontium salts; ammonium salts; protonated amines or protonated salts. Examples of alkanolamine salts include metal salts such as zinc and iron. A sodium salt is preferable. These various chelate compounds may be hydrates.

These chelate compounds can be used alone or in combination of two or more.
The ratio of the chelate compound to be blended in the water-blended coating composition of the present invention is not particularly limited as long as the effects of the present invention are exerted. Depending on the calcium ion sequestering force (trapping force), and in the coating composition The type of lime contained, the usage of the coating composition (for example, thin coating or thick coating) and the coating method (spray coating, trowel coating, roller coating, brush coating, etc.), and the coating machine or paint used Depending on the kind of the above, it can be appropriately selected from the range of usually 0.01 to 5% by weight per 100% by weight of the water-containing coating composition. Although not limited, it is preferably 0.02 to 3% by weight, more preferably 0.05 to 2% by weight, still more preferably 0.05 to 1% by weight, and particularly preferably 0.05 to 0.5% by weight. The ratio can be exemplified.

  As described above, the coating composition of the present invention comprises (a) lime, (b) water, and (c) polar amino acids as basic components, and further contains (d) a chelate compound as necessary. However, other components can be contained as long as the effects of the present invention are exhibited. Preferred examples of such components include (f) binders, (g) pigments, particularly white pigments, and (h) aggregates. Among these, (f) the binder is a useful component for further strengthening the adhesion of the coating composition to the substrate.

  The (f) binder used in the present invention may be any material that has the property of enhancing the initial adhesion between limes or increasing the adhesion to the construction surface of the coating composition. Funori, glutinous rice, seaweed paste, ginkgo paste, glue, casein, dextrin, thickening polysaccharide, etc.), synthetic paste (cellulose, such as methylcellulose, carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylmetholcellulose, chemical paste such as polyvinyl alcohol) ), A synthetic resin, or an inorganic adhesive (sodium silicate, sodium metasilicate, ceramics, etc.) can be arbitrarily used.

  Here, the synthetic resin is preferably a water-soluble or water-dispersible resin, specifically, a styrene / acrylic copolymer such as styrene-acrylic ester, styrene-acrylonitrile and styrene-acrylamide-ethyl acrylate, vinyl acetate-acrylic acid. Vinyl acetate / acrylic copolymers such as esters and vinyl acetate-methacrylic acid esters, butadiene / acrylic copolymers such as butadiene-acrylonitrile, vinyl chloride / acrylic copolymers, vinylidene chloride / acrylic copolymers, Veova / acrylic copolymers Polymer, acrylic copolymer, vinyl chloride / ethylene copolymer, vinyl chloride / vinyl acetate copolymer, vinyl chloride / vinylidene chloride copolymer, vinyl chloride / veova copolymer, vinyl acetate / ethylene copolymer, Vinyl acetate / veova copolymer, vinyl acetate / vinyl Oleic acid ester (eg vinyl acetate / dibutyl fumarate), vinyl acetate / maleic acid ester (eg vinyl acetate / dibutyl maleate); Veova / ethylene, acrylic modified / alkyd resin, acrylic modified / vinyl acetate / vinyl chloride Examples thereof include a vinyl-based synthetic resin such as a copolymer resin, a fluorine-modified acrylic resin, and a silicon-modified acrylic resin, or a polyurethane resin. From the viewpoint of weather resistance, an acrylic resin is preferable. More preferably, at least one of (meth) acrylic acid, (meth) acrylic acid ester, (meth) acrylamides, or (meth) acrylonitrile described in Japanese Patent No. 3094227 is used as a monomer component as an acrylic resin. (See Patent No. 3094227, paragraphs [0015] to [0017]. The description of the patent publication is incorporated as a description of the specification of the present invention). )

  Examples of thickening polysaccharides include gums derived from natural plants or microorganisms such as welan gum, carrageenan, locust bean gum, and tamarind seed gum.

  The ratio of the binder to be blended in the water-blended coating composition of the present invention is not particularly limited. For example, the blend ratio of the binder per 100% by weight of the solid content of the water-blended coating composition is usually 0 in terms of solids. A range of 0.1 to 50% by weight can be mentioned. Preferably it is 0.2 to 40 weight%, More preferably, it is 0.5 to 30 weight%, More preferably, it is 1 to 20 weight%.

The white pigment (g) used in the present invention may be an organic pigment or an inorganic pigment, but is preferably an inorganic white pigment. Specifically, at least one inorganic white pigment selected from the group consisting of titanium oxide, zinc white, zinc sulfide, lithopone, lead white, antimony white and zirconia can be exemplified. These may be used alone or in combination of two or more. Preferred is titanium oxide, or a combination of titanium oxide and another white pigment. Titanium oxide may have a photocatalytic function as long as it is used as a white pigment, and any of rutile, anatase, and brookite forms can be used. The rutile form is preferred. Incidentally, the titanium oxide may be surface treated with a hydrous metal oxide Al ₂ O ₃ · nH ₂ O or SiO ₂ · nH ₂ O or the like for the purpose of improving performance such as dispersibility and durability.

  The mixing ratio of the white pigment is not particularly limited as long as it does not interfere with the effect of the present invention. For example, the blending ratio per 100% by weight of the solid content of the water-containing coating composition is, for example, 0.05 to 40% by weight, preferably 0.25 to 30% by weight, more preferably 0.5 to 25% by weight in terms of solids. % Can be exemplified. In addition, as the blending ratio of the white pigment is increased, the uneven coating can be suppressed, and the coloration and coloring stability when the water-containing coating composition is colored are good, and the color unevenness of the film, fading (color loss) and Although the effect that the color difference can be suppressed tends to increase, the dispersibility and the storage stability of the coating composition can be taken into consideration, and it can usually be adjusted appropriately from the above range.

  Moreover, a color pigment (colored pigment) can be mix | blended as a pigment. Color pigments (colored pigments) are blended in combination with the above white pigments to form a good and uniform color and form a film in which color unevenness (including unevenness in coating), color skip and color difference are significantly suppressed. can do.

  The colored pigment is not particularly limited as long as it is a colored pigment other than white. Moreover, it does not matter whether the organic pigment or the inorganic pigment is different. Specifically, black pigments such as carbon black and iron oxide (iron black): cadmium red, red beryllium (red iron oxide), molybdenum red, red pigment such as red lead: chrome yellow, titanium yellow, cadmium yellow Yellow pigments of yellow iron oxide (yellow iron), tan, antimony yellow, vanadium tin yellow, vanadium zirconium yellow: green pigments such as chromium oxide, viridian, titanium cobalt green, cobalt green, cobalt chrome green, Victoria green, phthalocyanine green : Blue pigments such as ultramarine, bitumen, cobalt blue, cerulean blue, cobalt silica blue, cobalt zinc silica blue, and the like. Preferably, it is an alkali-resistant color pigment, more preferably, iron oxide such as black iron oxide (iron black), red bean (red iron oxide), or yellow iron oxide (yellow iron) or a metal oxide such as ultramarine, or It is a coloring pigment mainly composed of carbon black. In addition, these may be used individually by 1 type, or may combine 2 or more types arbitrarily, and can adjust a combination and a mixture ratio suitably so that it may become a desired color. Color soil can also be used. The blending ratio of the color pigment can be appropriately adjusted depending on the type of the color pigment to be used and the desired color, and is not particularly limited.

  In the water-containing coating composition of the present invention, (h) aggregate can be blended for the purpose of imparting design properties to the film. Finishing methods that are formed by spraying with a coating composition that contains aggregates are generally referred to as smooth finishing or sprayed lysine finishing. In this case, if the film is poorly integrated or adherent, the aggregate will peel off. Problem arises. According to the water-containing coating composition of the present invention, viscosity is generated by the addition of polar amino acids, and the integrity of the film and the adhesion of the film are improved. As a result, when bone finishing or spraying lysine finishing is a problem, It is possible to significantly prevent the material from peeling off.

  (H) Aggregates used in the present invention are not limited, but for example, inorganic aggregates (fine aggregates) such as reclaimed aggregates such as silica sand, cold water sand, perlite, vermiculite, shirasu sphere, and sludge fired aggregate. Others, kaolin, halloysite, montmorillonite, bentonite, gibbsite, mica, ceramic sand, glass beads, pearlite, acid clay, porcelain stone, branstone, feldspar, limestone, gypsum, dolomite, magnesite, talc, tourmaline, diatomaceous earth, zeolite, Natural inorganic materials such as iron powder and fly ash; Water-insoluble metal hydroxides such as barium hydroxide, magnesium hydroxide and natural calcium; Calcium silicate hydrates such as tobermonite and zonotolite; Calcium aluminate hydrate; Hydrate of various oxides such as calcium sulfoaluminate hydrate; Alumina Silica, precipitated silica, magnesia, zinc oxide, spinel, synthetic calcium carbonate, calcium phosphate, magnesium carbonate, and powder, fiber or granular inorganic material such as synthetic minerals such as barium sulfate, potassium titanate.

  Moreover, it can replace with an aggregate and replace with an aggregate, and a fiber and fiber powder can also be mix | blended. Examples of such fibers include natural fibers conventionally used for plaster materials, chemical fibers such as polyethylene and tetron, and wheat fibers. Examples of natural fibers include husa, white hair, nanjing, exposed, oil, and paper.

  The viscosity of the water-containing coating composition of the present invention is not particularly limited as long as it is a viscosity that can be used as a conventional paint or coating material. Although not constrained, if the coating composition is prepared to be suitable for spraying, roller or brushing or painting with an industrial coating machine, it is at least 300 cps at 25 ° C, preferably 300-10,000 cps, more preferably 700-10,000. When the cps is prepared so as to be suitable for glazing, it can be prepared at 2,000 to 30,000 cps, preferably 5,000 to 20,000 cps at 25 ° C. The viscosity of the coating composition can be adjusted by adjusting the solid content (moisture content), adjusting the type of binder and its blending ratio, and adding a thickener as necessary. Good.

  Here, as the thickener, those having good compatibility with water, water solubility or water dispersibility, and compatibility with slaked lime which is the main component of the water-containing coating composition are preferably used. Specifically, hydrophilic polymer compounds can be exemplified.

  Examples of the hydrophilic polymer compound include a cationic hydrophilic polymer compound having a cationic hydrophilic group such as a quaternary ammonium base or an amino group. Specific examples of such hydrophilic polymer compounds include aminoalkyl (meth) acrylate quaternary salt (co) polymers, polyaminomethylacrylamide salts or quaternary ammonium salts, acrylamide / aminomethylacrylamide copolymer salts or Quaternary ammonium salt, polyaminomethylacrylamide salt or quaternary salt, chitosan hydrochloride, sulfate or acetate, cationized starch, polyethyleneimine, vinylpyrrolidone / dimethylaminoethyl methacrylate quaternary copolymer, hydroxy Examples thereof include propyltrimethylammonium chlorided guar gum and hydroxypropyltrimethylammonium chlorided starch.

  Moreover, as a hydrophilic high molecular compound, the nonionic hydrophilic high molecular compound which has nonionic hydrophilic groups, such as a hydroxyl group, an ether group, and an amide group, can be illustrated. Specific examples of such hydrophilic polymer compounds include polyvinyl alcohol, formalin condensate of alkylphenol alkylene oxide adduct, polyethylene polyamine propylene oxide / ethylene oxide adduct, alkylamine alkylene oxide adduct, polyalkylene glycol copolymer, Polyglycol ester, polyacrylamide, polyethylene oxide, polyvinylpyrrolidone, polyvinylpyrrolidone / vinyl acetate copolymer; natural gums such as guar gum, locust bean gum, tragacanth gum, karaya gum, crystal gum, pullulan, xanthan gum; methylcellulose, ethylcellulose, hydroxymethylcellulose , Hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropyl Chill cellulose, cellulose derivatives such as hydroxyethyl cellulose is exemplified.

  Preferably, it is a nonionic hydrophilic polymer compound because it does not affect the behavior of an electrolytic substance such as lime that may be present in the water-containing coating composition and can be used regardless of its presence. Of these, natural gums and cellulose derivatives are preferred.

  A hydrophilic polymer compound having a hydroxyl group can also be used as a thickener. Specific examples of the hydrophilic polymer compound having a hydroxyl group include starches such as starch phosphate, cationized starch, starch / acrylic acid / sodium acrylate, and hydroxypropyltrimethylammonium chloride starch; methylcellulose, ethylcellulose, hydroxymethylcellulose , Hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, cellulose derivatives such as hydroxyethylmethylcellulose; xanthan gum, gellan gum, gum arabic, carrageenan, alginic acid or salt thereof, chitosan or salt thereof, hydroxypropyltrimethylammonium chlorided guar gum, guar gum, locust Bean gum, tara gum, curdlan, pullulan, chitin, ta Polyvinyl alcohol; Lind seed gum, dextran, polysaccharides such as dextrin and polyhydric alcohols such as glycerin or polyethylene glycol can be exemplified.

  Preferably, it is a nonionic hydrophilic polymer compound having a hydroxyl group. Specific examples include polyvinyl alcohol, formalin condensates of alkylphenol alkylene oxide adducts, polyethylene polyamine propylene oxide / ethylene oxide adducts, alkylamine alkylene oxide adducts, polyalkylene glycol copolymers, polyglycol esters. , Polyethylene oxide, polyvinylpyrrolidone, polyvinylpyrrolidone / vinyl acetate copolymer; gum agents such as guar gum, locust bean gum, tragacanth gum, karaya gum, crystal gum, pullulan, xanthan gum; methylcellulose, ethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose , Hydroxypropyl methylcellulose, hydroxyethyl Cellulose derivatives such as Le cellulose is exemplified. Preferred are cellulose derivatives such as methylcellulose, ethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, and hydroxyethylmethylcellulose.

  Moreover, saccharides can also be mix | blended as a hydrophilic compound. For example, monosaccharides such as glucose, fructose, galactose, mannose, xylose, arabinose and ribose: disaccharides such as maltose, sucrose, lactose and trehalose: trisaccharides such as maltotriose and raffinose: oligosaccharides: and sorbitol Examples include sugars such as sugar alcohol.

  The ratio of the various hydrophilic polymer compounds to be blended in the water-blended coating composition is not particularly limited, and is usually 0 in terms of solid (total amount) as a ratio contained per 100% by weight of the solid content of the water-blended coating composition. It can be suitably selected from the range of 0.01 to 5% by weight. Preferably it is 0.03 to 3 weight%, More preferably, it is 0.05 to 2 weight%, More preferably, it is 0.1 to 1 weight%. Although not restricted, the hydrophilic polymer compound is 0.003 to 3% by weight, preferably 0.009 to 2% by weight, more preferably 0.015 to 2% by weight in 100% by weight of the water-containing coating composition. More preferably, it is desirable to adjust the ratio to 0.03 to 1% by weight.

  The water-containing coating composition of the present invention containing (d) a chelate compound includes (e) a silicon compound (silicon monoxide, silicon dioxide, silicic acid, silicate (calcium silicate, sodium silicate, etc.) , Silicon nitride, silicon carbide, silicon tetrachloride, silane, silicon, silicon resin) or a substance containing this as a component (for example, diatomaceous earth, silica, zeolite, sepiolite, fly ash, water glass, etc.) it can. Usually, when soluble silica is blended in calcium hydroxide, a pozzolanic reaction occurs, and an insoluble siliceous compound is generated and cured. Since the coating composition of the present invention contains a chelate compound, the pozzolanic reaction (curing phenomenon) is suppressed even when a silicon compound is added, and the fluidity can be maintained in a water-containing state. In addition, the compounding ratio of these silicon compounds is not particularly limited. For example, in the case of diatomaceous earth, silica, zeolite, sepiolite, fly ash, etc., it can be selected from the range of 0.5 to 90% by weight in 100% by weight of the water-containing coating composition, usually 1 to 60% by weight, The ratio is preferably 5 to 30% by weight, more preferably 5 to 20% by weight. Further, in the case of a concentrated aqueous solution of sodium silicate such as water glass, it can be blended in a proportion of 0.1 to 10% by weight, preferably 0.1 to 5% by weight, in 100% by weight of the water-blended coating composition.

  Furthermore, the water-containing coating composition of the present invention includes, as other optional components, extender pigments, oils, photocatalysts, dispersants, wetting agents, water reducing agents, fluidizing agents, antifoams, as long as the effects of the present invention are not hindered. An agent, a pH adjuster, a surfactant, a waterproofing agent and the like can also be blended.

  The extender pigments include talc, kaolin clay, aluminum hydroxide, calcium carbonate (heavy calcium carbonate, light (precipitating) calcium carbonate), bentonite, barium sulfate (precipitating barium sulfate, barite powder), white carbon, A silica etc. can be illustrated.

  As the oil, oils conventionally used in plaster materials can be widely used. For example, rapeseed oil, linseed oil, safflower oil, sunflower oil, avocado oil, evening primrose oil, soybean oil, corn oil, peanut oil, cottonseed oil , Sesame oil, rice oil, rapeseed oil, olive oil, castor oil, emma oil, kiri oil, niger seed oil, kapok oil, safflower oil, purple seed oil, primrose seed oil, camellia oil, etc. .

  Examples of the photocatalyst include oxides having photocatalytic activity. Such oxides having photocatalytic activity include titanium oxide, rubidium oxide, cobalt oxide, cesium oxide, chromium oxide, rhodium oxide, vanadium oxide, zinc oxide, manganese oxide, rhenium oxide, ferric oxide, tungsten trioxide, and oxide. Examples thereof include inorganic oxides such as zirconium, tin oxide, bismuth oxide, ruthenium oxide, strontium titanate, molybdenum oxide, germanium oxide, lead oxide, cadmium oxide, copper oxide, niobium oxide, and tantalum oxide.

  As the dispersant and the wetting agent, both can be appropriately selected from those usually used in blends in paints and coating materials. For example, a formalin condensate of sodium alkylnaphthalene sulfonate, polyacrylic acid copolymer, acrylic Examples include acid-maleic acid copolymers, styrene-maleic acid copolymers, fatty acid esters of polyoxyethylene, alkylphenol ethers, sulfosuccinic acid derivatives, block polymers of polyethylene oxide and polypropylene oxide, and the like.

  Examples of the water reducing agent or fluidizing agent include surfactants such as lignin sulfonic acid, naphthalene sulfonic acid, melamine sulfonic acid, polystyrene sulfonic acid, and polycarboxylic acid.

  As an antifoamer, it can select suitably from what is normally mix | blended and used for a coating material, a coating material, and a building spraying material. Examples thereof include various foam suppressors and foam breakers such as octyl alcohol, glycol derivatives, cyclohexane, silicon, pluronic surfactants and polyoxyethylene alkylphenyl ether.

  Although it does not restrict | limit especially as a waterproofing agent, A silicone oil, a silicone resin, an organoalkoxysilane etc. can be illustrated.

  Preparation of the water-containing coating composition of the present invention is basically performed by mixing the above-mentioned components using a conventional method of coating material or paint, for example, a blending device (mixer, shaker, mill, kneader, etc.). Can be implemented. At this time, it can also be appropriately adjusted to a desired viscosity according to the intended use and coating method.

  The thus-prepared water-containing coating composition of the present invention is excellent in fluidity, and can be applied using a spray (air spray, airless spray, low-pressure atomizing spray, etc.) as well as roller coating and brush coating. It can be suitably used for coating using an industrial coating machine (automatic coating machine) such as a flow coater, a roll coater or a vacuum coater. In addition, the water-containing coating composition of the present invention has a strong adhesion to an object (base material) due to its viscosity, and also has a good dispersibility, so that the adhesion strength is uniform and stable (excellent in durability). A coating film (film)) can be formed. Furthermore, since the water-containing coating composition of the present invention has viscosity, it is possible to suppress cracks that occur in the formed coating film (film), particularly in the early stage of drying and cracks caused by forced drying. As described above, since the water-containing coating composition of the present invention can be applied by an industrial coating machine (automatic coating machine) and forcedly dried, it can be used for coating on an industrial line, and a coating layer such as a decorative boat or a sheet can be used. It can be used suitably for industrially producing a large number of boats and seats.

  However, the present invention is not limited to this, and the water-containing coating composition of the present invention is used as a coating material for architectural and civil engineering, a paint, a sealer, a primer, or an adhesive, and as a coating material or an adhesive for a textile product. Further, it can be widely used as a coating material for furniture and office tools, a paint, a sealer, a primer, or an adhesive. Specifically, for example, painting (coating) of interior and exterior surfaces such as ceilings and walls (inner and outer walls) of various buildings; base materials and decorative materials for ceilings and walls (inner and outer walls) of buildings Coating (coating) of various building materials (cloths, panels, boards) used as fabrics; Coating of textile products such as curtains, carpets, chairs, car seat covers, in-sole linings, insoles; joinery and clothes Furnishings such as pots, chests, desks, bookcases and shoe boxes, water-filled furniture such as sinks and washbasins, office equipment such as partitions, bookcases and desks, or painting of these components (coating); tunnel walls, guardrails , Painting of surfaces of road structures such as sound insulation walls and protective walls, and surfaces of bridge structures (coating); and civil engineering such as various wall materials such as tunnel walls, sound insulation walls, protective walls, and various members of bridge structures for Wood (panels, boards, pillars) may be used for coating (coating).

II. Coating Composition Package The water-containing coating composition of the present invention is provided in a state of being filled in a water-resistant container after being prepared and housed in the container. Therefore, this invention provides the coating composition package body which accommodates the said water mixing | blending coating composition in a container.

  Here, it is essential that the container used for containing the water-containing coating composition is water resistant. However, due to the liquid property of the coating composition, at least the inner surface that comes into contact with the composition is alkali resistant. It is preferable that it has. For this purpose, a method using an alkali-resistant container, a method of coating an inner surface of a container such as a film or a can with an alkali-resistant resin, a method of employing an alkali-resistant resin film on the inner surface of the container, or the like can be used.

  Moreover, a flexible container can also be used as a container. Examples of the flexible container include a container made of a film or a sheet. Such a container has a carbon dioxide barrier property in order to prevent solidification of slaked lime contained in the water-containing coating composition due to carbon dioxide absorption. It is preferable. As a container having such carbon dioxide barrier property, any container having carbon dioxide permeation resistance may be used so long as the water-containing coating composition contained in the container is not adversely affected (solidified). In general, as a carbon dioxide barrier material, polyvinylidene chloride resin (PVDC), various (poly) vinylidene chloride coated films, ethylene vinyl alcohol film, saponified ethylene-vinyl acetate copolymer (EVOH) coated film, polyester ( Especially PVDC coated polyester), nylon (especially PVDC coated nylon), polyvinyl alcohol, vinylon, vinylidene chloride, cellophane (lacquer coated cellophane, polymer coated cellophane), aluminum foil laminated film, vapor deposited film of inorganic substances such as silicon oxide and aluminum oxide Synthetic resins such as are known. In the present invention, a film having a carbon dioxide barrier property can be arbitrarily selected and used without any particular limitation. In general, when the water-containing coating composition targeted by the present invention is stored in a water-resistant container in an airtight state and stored at room temperature (20 ± 5 ° C.) for at least one month, the internal water-containing coating composition If no curing is observed, it can be determined that the container has a carbon dioxide barrier property.

Suitable containers, without being limited to the above ^materials, can be exemplified those composed of film with a 200g / m 2 / 24hrs / atm (20 ℃, dry) or less of carbon dioxide permeability. Preferably ^{100g / m 2 / 24hrs / atm} (20 ℃, dry) or less, more preferably ^{50g / m 2 / 24hrs / atm} (20 ℃, dry) or less, more preferably ^{20g / m 2 / 24hrs / atm} (20 ° C., dry) or less, more preferably ^{10g / m 2 / 24hrs / atm} (20 ℃, dry) or less (ASTM D1434-58, thickness 25.4μ). Such a container having a carbon dioxide barrier property is a multilayer of two or more layers so as to adjust the thickness of a known gas barrier material, particularly a carbon dioxide permeation barrier material, or to include a laminate layer made of the material. Or it can achieve by preparing as a multilayer film.

  Furthermore, it is preferable that the container further has a water vapor barrier property in order to prevent the solidification due to the evaporation of water from the water-containing coating composition housed therein and to enhance the stability. Such water vapor barrier property may be any water vapor permeation resistance as long as the water-containing coating composition contained in the container is not adversely affected (dried and solidified).

  As the water vapor barrier material, polyvinylidene chloride resin (PVDC), various (poly) vinylidene chloride coated films, moisture-proof cellophane (lacquer coated cellophane, polymer coated cellophane), polyester, PVDC coated polyester, PVDC coated nylon, polyvinyl chloride, Polyethylene (low density, medium density, high density, especially high density polyethylene), linear rhoden polyethylene, stretched polyethylene, unstretched polypropylene, stretched polypropylene, ethylene-vinyl acetate copolymer, ionomer, aluminum foil laminate film, silicon oxide and oxide Synthetic resins such as vapor deposited films of inorganic substances such as aluminum are known. In general, when the water-containing coating composition targeted by the present invention is stored in a water-resistant container in an airtight state and stored at room temperature (20 ± 5 ° C.) for at least one month, the internal water-containing coating composition If dry solidification is not observed, it can be determined that the container has a water vapor barrier property.

Suitable examples of the flexible container include, but are not limited to, the above-described materials, and those made of a film having a water vapor permeability of 40 g / m ² · 24 hrs (37.8 ° C., 90% RH) or less. be able to. The water vapor permeability is preferably 30 g / m ² · 24 hrs (37.8 ° C., 90% RH) or less, more preferably 20 g / m ² · 24 hrs (37.8 ° C., 90% RH) or less, more preferably 10 g. / M ² · 24 hrs (37.8 ° C., 90% RH) or less (ASTM E-96, thickness 25.4 μ). Such a water vapor barrier property is achieved by adjusting the thickness of a known water vapor barrier material or by preparing a film as a multilayer or multilayer film of two or more layers so as to include a laminate layer made of the material. Can do.

  Further, the flexible container may be a single-layer film made of a kind of resin, or may be a multi-layer or multi-layer film having a laminated structure (laminate layer or coat layer) of two or more kinds of resin films. It may be. In addition, it is not questioned whether it is a non-stretched film or a stretched film (uniaxial stretching or biaxial stretching). Preferably, at least one surface is coated with a polyvinyl alcohol (PVA) resin (such as a PVA-coated biaxially stretched polypropylene film), and at least one surface is coated with a polyvinylidene chloride (PVDC) resin (such as a PVDC-coated biaxially stretched polypropylene film) , PVDC coated polyester film, PP / PVA / PVDC / PP, etc.), polyolefin unstretched coextruded multilayer film (PP / PE / PP, polyolefin (PE, PP, etc.) / Polyvinylidene chloride / polyolefin), etc. However, it is not particularly limited to these.

  In the above, an even more optimal container is preferably composed of a film made of a synthetic resin excellent in properties such as strength, impact resistance, pinhole resistance, heat sealability, or alkali resistance. Multilayer or multilayer films may be used to satisfy these different properties. In this case, it is preferable that at least the inner layer of the container has alkali resistance and heat sealability. Examples of the alkali-resistant resin include vinyl chloride, vinyl acetate, and urethane resin. Preferably, a homopolymer of vinyl polymer (for example, those having a weight average molecular weight of 20,000 or more are exemplified) or a copolymer and / or an alkali-resistant urethane resin (for example, having a weight average molecular weight of 100,000 or more is exemplified). In particular, polyvinyl chloride and vinyl chloride-vinyl acetate copolymers can be preferably exemplified. In the present invention, the alkali resistance means that the container film is not visually dissolved or corroded even when the coating composition as the contents is put and left at room temperature for 3 months, preferably 6 months. More preferably, it is desirable to use one that can obtain alkali resistance in the following accelerated test.

<Accelerated test for alkali resistance evaluation>
A 1N aqueous potassium hydroxide solution is placed in a water-resistant container, left in a thermostat at 50 ° C. for 6 hours, and then left at room temperature for 18 days. Then, the aqueous potassium hydroxide solution is taken out and the inner surface of the container is visually dissolved. Evaluate the presence or absence of corrosion.

  In the case of a film, the thickness employed (thickness of the container) is not particularly limited as long as the carbon dioxide barrier property and the water vapor barrier property are satisfied, but preferably 3 to 30 μm, more preferably 5 to 200 μm. is there. If the thickness is less than 2 μm, the strength, impact resistance, pinhole resistance and carbon dioxide permeation barrier properties tend to be insufficient, and if it exceeds 300 μm, flexibility (flexibility) and transparency are insufficient. It is easy to become. More preferably, it is 10-100 micrometers, More preferably, it is 10-80 micrometers.

  Transparency as a film is not particularly required, but since the coating composition accommodated as the content is excellent in weather resistance, it is less affected by light, and it is preferable for the product to be recognized from the outside, so it is transparent. It is desirable to have properties. In this case, transparency means that the contents can be seen visually.

  Furthermore, the flexible container used in the present invention may be easily tearable so that it can be easily opened during use. Conventionally known techniques can be arbitrarily used as the easy tearing technique, for example, formation of V-notch or U-notch, use of tear tape, use of needle-like filler, formation of perforation, or fine scratches on the film surface. The method of attaching etc. can be illustrated. Further, as long as the above properties are satisfied, an easily openable material in which a uniaxially stretched polyolefin film is laminated on the intermediate layer of the film (for example, a three-layer laminate of biaxially stretched polyester film / uniaxially stretched polyolefin film / unstretched polyolefin film) Film etc.) can also be used. Moreover, the container used by this invention may be provided with reclosing means, such as a zipper, in an opening part.

The method of filling and sealing the coating composition in such a flexible container is not particularly limited, but preferably, filling is performed so that air is not mixed as much as possible during filling, and then the filling port is heat sealed (bar seal, hot melt seal, Examples of the sealing method include a hermetic seal (sealing), an impulse seal, a high frequency seal, an ultrasonic seal, and the like. In addition, as a method of filling so that air is not mixed as much as possible, for example, a method of filling under a degassing condition, a vacuum condition or a N ₂ gas replacement condition, or after filling a container with a coating composition and then degassing the filling port The method of blocking can be illustrated.

  Since lime has high thixotropic flow characteristics, if the aqueous dispersion is left standing for a certain period of time, it aggregates and the fluidity becomes extremely poor. Although this returns to the original fluidity by applying a force such as agitation, it will agglomerate again when it is allowed to stand, resulting in poor fluidity. On the other hand, the water-containing coating composition containing the chelate compound of the present invention has the feature that the high thixotropic flow characteristics inherent in lime are alleviated and reduced in aggregation by the action of the chelate compound. Yes. For this reason, the water-containing coating composition filled and accommodated in the above water-resistant containers (including ordinary paint storage containers and flexible containers) is in a uniform state (fluidity) in the form of such a package. , Viscosity) can be kept stable. For this reason, it is possible to simplify the troubles such as re-stirring at the time of use and massaging, which have been essential in the past.

III. Board or sheet and their production method The water-containing coating composition of the present invention can be suitably used for the production of boats and sheets. Therefore, this invention provides the board or sheet | seat which has the coating layer formed from the said water-containing coating composition on the base-material (to-be-coated object) surface.

  Although it does not restrict | limit especially as a base material which this invention makes object, A board (a panel is included) and a sheet | seat (a cloth is included) can be mentioned.

  The board (including the panel) is not particularly limited as long as the water-containing coating composition of the present invention is a plate-like material that can form a film on the surface thereof. The water-containing coating composition of the present invention may form a film directly on the board surface. However, after the board surface is treated with a base treatment agent (sealer) or the like, the film can be formed thereon. Although it does not restrict | limit as a board, For example, the board | substrate material and panel material which are used for the interior for interiors (a wall, a ceiling, etc.) and exterior for construction can be mentioned widely. Specifically, wood board (including solid wood), plywood, medium density fiber board, plastic board, cement mortar, asbestos cement calcium silicate board, hollow cement board, wood cement board, panel cement board, rock wool board, wood Wool cement board, steel plate panel, metal plate panel, concrete board, PC panel, ALC panel, asbestos slate, gypsum board, particle board, foam cement board, wood chip cement board, calcium silicate board, slag cement board, wood plastic combination And siding boards, insulation boards, volcanic glassy multilayer boards and the like. Gypsum board, gypsum particle board, wood board, medium density fiber board, calcium silicate board, plastic board, siding board (including metal and ceramics) are preferable.

  The sheet (including cloth) may be any sheet-like material that can be applied to the surface of the water-containing coating composition of the present invention, and is not particularly limited. Similarly to the board, after the surface of the sheet is treated with a base treatment agent (sealer) or the like, a film can be formed thereon. Sheets include, for example, sheet materials used for architectural interiors (interior walls, ceilings, etc.); furniture such as joinery, clothes holders, chests, desks, bookcases and clogs; water furniture such as sinks and washbasins; And sheet materials used for decorative finishing of office tools such as partitions, bookcases and desks and their components; widely mention textile products such as curtains, carpets, chair stretches, car seat covers, shoe linings, and insoles it can. For example, examples of the sheet material include fiber sheets such as paper, various natural fibers, and non-woven fabrics or woven fabrics made of artificial fibers. Specifically, the paper may be any of Japanese paper, western paper (high quality paper, medium quality paper), kraft paper, thin paper, backing paper, resin-impregnated paper, cardboard, cardboard, etc. In addition, paper suitable for wallpaper construction such as flame-retardant backing paper and non-combustible paper is also included. Examples of the fibrous sheet include natural fibers; glass fibers; or porous woven fabrics, nonwoven fabrics, knitted fabrics, and the like obtained by using synthetic fibers such as polypropylene, acrylic, nylon, polyester, polyethylene terephthalate, polyamide, and vinylon. Can be mentioned. In addition, the said raw material can be used individually by 1 type, or can also be used in combination of 2 or more types arbitrarily. The sheet may be a mesh sheet.

  The boat or sheet of the present invention is applied by applying and coating the above-described water-containing coating composition of the present invention on the surface of a substrate such as the above board or sheet (which may be subjected to a ground treatment) and then drying. Can be manufactured by. The method of application / coating is not particularly limited, and includes roller coating, brush coating, trowel coating, coating using a spray or gun (air spray, airless spray, low-pressure atomizing spray, etc.), flow coater, roll Any of coating using an industrial coating machine (automatic coating machine) such as a coater or a vacuum coater may be used. For the purpose of industrially producing a large number of boats or sheets, a coating method using the industrial coating machine (automatic coating machine) can be suitably used.

  Thus, the thickness of the coating layer formed on the surface of the substrate is not particularly limited and can be arbitrarily set as desired, but can be appropriately selected from a range of usually 0.05 to 15 mm.

  Any of a natural drying method, a ventilation drying method, a forced drying method or a heat drying method can be used for drying the water-containing coating composition coated on the surface of the article (base material). At this time, the slaked lime contained in the water-containing coating composition is bonded and cured by itself, and when the coating composition contains a binder, the slaked lime is bonded and cured together with the binder, and adheres to the substrate surface to form a coating layer. The water-blended coating composition of the present invention has excellent dispersibility due to the blending of polar amino acids, and the adhesion to the object to be coated is reinforced by the viscosity, so that the entire surface of the object to be coated (substrate) It is possible to form a coating layer that adheres uniformly and firmly.

  In addition, the formed coating layer can be finished by applying a design with a concavo-convex pattern roller or a trowel before drying, or by polishing with a file or various polishing machines after drying, if necessary.

  The board or sheet of the present invention may be one in which the surface of the coating layer formed from the water-containing coating composition is laminated with a protective sheet or film. In particular, when a decorative boat or sheet is manufactured in a factory, fouling, scratches and cracks in the coating layer (decorative layer) that may occur during subsequent transportation, secondary processing, or construction will significantly reduce the commercial value. . The protective sheet or film is laminated on the surface of the coating layer in order to protect the coating layer (decorative layer) from fouling, scratches and cracks during such transportation, secondary processing, or construction. Later, it can be easily removed without damaging the coating layer (decorative layer) surface with an appropriate force.

  The material of the protective sheet or film is not particularly limited as long as it is suitable for this purpose, and the breathability and the non-breathability are not particularly limited. In general, a film having a thickness of less than 0.25 mm is referred to as a film, and a sheet having a thickness of 0.25 mm or more is referred to as a sheet.

  The protective sheet or film (hereinafter referred to as “protective sheet or the like”) is preferably one that can be laminated on the surface of the coating layer formed from the coating composition by a laminating technique. For example, on one side of a film or sheet-like substrate made of paper, cellophane, aluminum foil, or synthetic resin (eg, polyethylene, polypropylene, nylon, ethylene / vinyl acetate copolymer, polyester, vinylon, polyethylene terephthalate, etc.) Examples thereof include those obtained by laminating a resin such as a heat-sensitive adhesive or a pressure-sensitive adhesive. The resin used as the adhesive is not limited, but ionomer resin, ethylene / methacrylic acid copolymer resin, ethylene / ethyl acrylate copolymer resin, low density polyethylene resin, ethylene / vinyl acetate copolymer resin Etc. can be illustrated.

IV. Method for improving fluidity of water-containing coating composition As described above, in a water-containing coating composition containing lime as a film component, dispersibility of lime in water is improved by using polar amino acids, and water is added. The fluidity of the coating composition itself is improved. For this reason, this invention provides the method of improving fluidity | liquidity about the water-containing coating composition containing a lime as a film | membrane component.

  This method is characterized in that a composition containing the above-mentioned polar amino acids in addition to lime is used as the water-containing coating composition used for film formation.

  Here, the type and amount of lime used in the preparation of the coating composition, the type and amount of polar amino acids, the amount of water are as described in the above section I, and this can be used. it can.

  Such a water-containing coating composition contains lime, polar amino acids, and water as basic components, but is not limited to the effects of the present invention (adhesion improvement, uniform adhesion stability). A compound can also be blended, and further other components can be blended. As such other components, a binder can be preferably used, and a thickener can be blended as necessary. If necessary, white pigments, colored pigments (colored pigments), extender pigments, fibers such as oil and soot, photocatalysts, dispersants, wetting agents, antifoaming agents, aggregates, pH adjusters, surfactants, water reducing agents Materials, fluidizing agents, waterproofing agents and the like can also be blended. The types, blending amounts, blending methods, and the like of these components are as described in the above section I, and this description can also be used here.

  According to the method of the present invention, it is possible to prepare a water-containing coating composition having excellent fluidity and an appropriate viscosity. For this reason, the water-containing coating composition to which the method of the present invention is applied is excellent in fluidity and has an appropriate viscosity, so that it is suitably applied to a flow coater that applies a coating by flowing in a curtain from a narrow slit. be able to. That is, according to the water-containing coating composition prepared by the method of the present invention, boards and sheets having this coating layer can be produced industrially in large quantities using an industrial coating machine such as a flow coater. .

  In addition, the to-be-coated object which apply | coats and coats the water-containing coating composition obtained by the said method is not restrict | limited in particular.

  For example, the object to be coated is not limited, but preferably various building materials used as a base material or a decorative material for the ceiling or wall (inner / outer wall) of a building; furniture (including furniture around water) Materials used for fabrics and office equipment; materials used for textile products such as curtains, carpets, chair stretches, car seat covers, shoe-in-places, insoles, etc .; or tunnel wall materials, guardrail materials, sound insulation wall materials And board materials (panel materials) or sheet materials such as various civil engineering members used as protective wall materials and bridge structures.

  As described above, the coating composition is applied to these objects (building materials, furniture and office tools, textile products, civil engineering materials) such as flow coaters, roll coaters, and vacuum coaters. Preferred examples include, but are not limited to, a roller coater, brush coater, trowel coater, spray and gun (air spray, airless spray, low-pressure atomizing spray, etc.) ) Can be widely used.

V. Method for Improving Adhesion of Water-Containing Coating Composition or Uniform Stabilization of Adhesion As described above, in a water-containing coating composition containing lime as a film component, dispersibility is improved by using polar amino acids. Viscosity is generated and the adhesion to the object is enhanced. For this reason, this invention provides the method of improving the adhesive force about the water-containing coating composition containing a lime as a film | membrane component, and the method of stabilizing uniformly the adhesive force with respect to a to-be-coated object.

  This method is characterized in that a composition containing the above-mentioned polar amino acids in addition to lime is used as the water-containing coating composition used for film formation.

  Here, the type and amount of lime used in the preparation of the coating composition, the type and amount of polar amino acids, the amount of water are as described in the above section I, and this can be used. it can.

  Such a water-containing coating composition contains lime, polar amino acids, and water as basic components, but is not limited to the effects of the present invention (adhesion improvement, uniform adhesion stability). Compounds can also be blended, and other ingredients can be blended. As such other components, a binder can be preferably used, and a thickener can be blended as necessary. If necessary, white pigments, colored pigments (colored pigments), extender pigments, fibers such as oil and soot, photocatalysts, dispersants, wetting agents, antifoaming agents, aggregates, pH adjusters, surfactants, water reducing agents Materials, fluidizing agents, waterproofing agents and the like can also be blended. The types, blending amounts, blending methods, and the like of these components are as described in the above section I, and this description can also be used here.

  By using such a water-containing coating composition for film formation, it is possible to form a lime-containing film having excellent adhesion strength, in other words, excellent durability. Further, since this water-containing coating composition is excellent in dispersibility, it is possible to form a film having a uniform and stable adhesion strength to the surface of the object to be coated.

  The construction method and the object to be coated / coated with the water-containing coating composition are not particularly limited.

  For example, the object to be coated is not limited, but preferably various building materials used as a base material or a decorative material for the ceiling or wall (inner / outer wall) of a building; furniture (including furniture around water) Materials used for fabrics and office equipment; materials used for textile products such as curtains, carpets, chair stretches, car seat covers, shoe-in-places, insoles, etc .; or tunnel wall materials, guardrail materials, sound insulation wall materials And board materials (panel materials) or sheet materials such as various civil engineering members used as protective wall materials and bridge structures.

  As described above, the coating composition is applied to these objects (building materials, furniture and office equipment members, textile products, civil engineering members) by roller coating, brush coating, iron coating, and spraying. Ordinary methods such as painting using guns and guns (air spray, airless spray, low-pressure atomization spray, etc.) and painting using industrial coating machines (automatic coating machines) such as flow coaters, roll coaters, vacuum coaters, etc. Can be mentioned.

VI. Method for improving crack resistance of coating composition As described above, in a water-containing coating composition containing lime as a film component, viscosity is generated by using polar amino acids, and the film after coating has crack resistance. It is possible to significantly prevent cracking during drying. For this reason, the present invention provides a method for forming a crack-resistant lime-containing film, in other words, a method for suppressing cracks in a film containing lime.

  This method is characterized in that a composition containing polar amino acids in addition to lime is used as the water-containing coating composition used for film formation. More preferably, a chelate compound is used in combination.

  Here, the type and amount of lime used for the preparation of the water-containing coating composition, the type and amount of polar amino acids and chelate compounds, and the amount of water are as described in section I above. Can be used.

  Such a water-containing coating composition contains lime, polar amino acids, and water as basic components, and further contains a chelate compound as necessary. Ingredients can be included. As such a component, a binder can be preferably used. Moreover, a thickener can also be mix | blended as needed. If necessary, white pigments, colored pigments (colored pigments), extender pigments, fibers such as oil and soot, photocatalysts, dispersants, wetting agents, antifoaming agents, aggregates, pH adjusters, surfactants, water reducing agents Materials, fluidizing agents, waterproofing agents and the like can also be blended. The types, blending amounts, blending methods, and the like of these components are as described in the above section I, and this description can also be used here.

  By using such a coating composition for film formation, it is possible to form a lime-containing film that is resistant to cracking, and particularly difficult to crack even by forced drying using heating or ventilation. The construction method and the object to be coated / coated with the coating composition (the object to be coated) are not particularly limited, and any of those described above can be used.

  In addition, the coating composition can be finished by applying a design with a roller with a concavo-convex pattern or a trowel before drying the surface of the coating layer formed as necessary, or by polishing with a file or various polishing machines after drying. . Moreover, after coating the surface of a membrane | film | coat layer with a roller with a concavo-convex pattern, a trowel, etc., the coating composition can also apply | coat thinly again from on it. A coating (painted product) having a film formed from the coating composition can be prepared by simple construction without requiring advanced techniques because the film has crack resistance. Moreover, since the film formed from the coating composition has crack resistance regardless of the thickness (irregularity), various textures (designs) can be applied to the film.

  Hereinafter, the contents of the present invention will be specifically described with reference to the following experimental examples and examples. However, these examples and the like are only one aspect of the present invention, and the present invention is not limited to these examples.

Experimental example 1
The components listed in Table 1 were placed in a mixer for coating material preparation and stirred to disperse the solid content in water, thereby preparing water-containing coating compositions (Examples 1 to 5 and Comparative Examples 1 and 2). In addition, sodium glutamate (Example 1), sodium aspartate (Example 2), sodium polyglutamate (Example 3), and polylysine (Example 4) were used as polar amino acids. Further, sodium gluconate (Example 5, Comparative Example 1) was used as a chelate compound.

  After crushing this with an 80-mesh filter, place it in a container with a slit (width 0.6mm, length 60cm) created by imitating the paint outlet of a flow coater, which is an automatic coating machine, with the slit side down. Each water-blended coating composition was allowed to flow out from the slit in the form of a curtain, and the presence / absence of fluid curtain breakage was evaluated. The results are shown in Table 1. In addition, the presence or absence of curtain breakage was evaluated according to the following criteria.

<Evaluation>
(Double-circle): The fluid flowed out without interruption throughout the entire width of the slit (no curtain break).
○: Curtain break was observed on the way, but as a whole, the fluid flowed out almost without interruption (some curtain breaks).
(Triangle | delta): Although the fluid flowed out over the full length of the slit at the beginning, the curtain was cut off on the way and it flowed out to the end in that state.
X: The curtain was cut shortly after the outflow, and the fluid flowed out as it was biased to a part of the slit.

  As can be seen from Table 1, the water-blended coating compositions (Comparative Examples 1 and 2) containing slaked lime not blended with a polar amino acid or a polar amino acid polymer had poor flowability from the slit, and the curtain was cut off in the middle. On the other hand, the water-containing coating compositions (Examples 1 to 5) containing a polar amino acid or a polar amino acid polymer almost did not run out of the curtain, and flowed out of the slit well to the end. In particular, the coating compositions (Examples 1, 2 and 5) containing the polar amino acid were not curtained at all. This is because not only the flowability of slaked lime has been improved by adding a polar amino acid or a polar amino acid polymer to a water-containing coating composition containing slaked lime, but also an appropriate viscosity is generated in the water-containing coating composition, resulting in an This is thought to be due to the improved connectivity.

  Further, in addition to the components of each of the water-containing coating compositions of Examples 1 to 5 and Comparative Examples 1 and 2, polyvinyl alcohol is added as a binder at a ratio of a final concentration of 5% by weight, and the water-containing coating composition Products (Examples 1 ′ to 5 ′ and Comparative Examples 1 ′ to 2 ′) were prepared, and fluidity (presence / absence of curtain breakage) was evaluated according to the above method. As a result, there was no influence of the binder on the fluidity, and the same results as in Examples 1 to 5 and Comparative Examples 1 and 2 were obtained.

  From these results, coating with water-containing coating composition containing slaked lime with polar amino acid or polar amino acid polymer, suitable for automatic coating machines such as flow coaters, with good fluidity and significantly reduced curtain breakage It has been found that a composition can be prepared.

Experimental example 2
The ingredients listed in Table 2 were placed in a mixer for preparing a coating material and stirred to disperse the solid content in water, thereby preparing water-containing coating compositions (Examples 6 to 16, Comparative Examples 1 and 2). As polar amino acids, lysine monohydrate (Example 6), arginine hydrochloride (Example 7), L-histidine hydrochloride monohydrate (Example 8), asparagine monohydrate (Example 9), glutamine (Example 10), L-serine (Example 11), L-threonine (Example 12), tyrosine (Example 13), L-tryptophan (Example 14), and L ( -)-Proline (Example 15) was used. Moreover, sodium gluconate (Example 16, comparative example 1) was used as a chelate compound.

  With respect to these water-containing coating compositions, the presence or absence of fluid curtain breakage was evaluated in the same manner as in Experimental Example 1. The results are shown in Table 2.

  As can be seen from Table 2, as in Experimental Example 1, the water-containing coating composition containing slaked lime not containing a polar amino acid (Comparative Examples 1 and 2) has poor flowability and connectivity from the slit, and the curtain The water-blended coating compositions (Examples 6 to 16) blended with polar amino acids hardly broke out of the curtains, but flowed out of the slits well until the end.

  From this result, it was confirmed that a coating composition suitable for an automatic coating machine such as a flow coater can be prepared by blending a polar amino acid into a water-containing coating composition containing slaked lime. Furthermore, from the results of Examples 11 and 16, it was considered that the effect was further improved by using a chelate compound in combination.

Experimental example 3
Various water-containing coating compositions (Example 17, Comparative Examples 3 and 4) described in Table 3 were prepared using sodium glutamate as the polar amino acid and sodium gluconate as the chelate compound. This is applied to a substrate (100cm x 100cm) that has been pretreated with a sealer, dried for 10 days, and the formed coating (coating thickness: 0.2mm) is applied to JIS A6909 (finishing coating material for construction). A coating film adhesion test (dry adhesion, adhesion after water immersion) was conducted according to the following method.

<Dry adhesion test>
(1) At the four arbitrarily selected locations (No.1, No.2, No.3, No.4) of the coating surface formed on the surface of the substrate (100cm x 100cm) using each coating composition The steel attachment is affixed with a fast-curing epoxy resin adhesive and cured.
(2) After the adhesive is cured, cut the periphery of the attachment with a cutter knife, and cut off the peripheral coating film and the test location.
(3) Insert the adhesive tester, read the maximum load at break under a load, in terms of the bond strength per ^{1mm 2 (N / mm 2)} .
(4) Observe the fracture surface and evaluate at which part it fractured.

<Adhesion test after water immersion>
(1) Curing the parts other than the paint film surface (the back and sides of the paint film surface) of the substrate (100cm x 100cm) whose surface is coated with each water-containing coating composition with the waterproof tape, with the paint film face down Immerse in water (room temperature) for 10 days.
(2) After immersion, after drying at 50 ° C. for 24 hours and standing at room temperature (20 ° C.), the above-mentioned dry adhesion test (1) to (4) was conducted in the same manner.

  The results are shown in Table 3.

  As shown in Table 3, the coating strength was increased by adding a chelate compound (sodium gluconate) to a water-containing coating composition containing slaked lime from the results of dry adhesion (Comparative Example 3). The coating film strength was further increased by adding a polar amino acid (sodium glutamate) to (Example 17). The coating film of Comparative Example 4 in which neither a chelate compound nor a polar amino acid was blended was broken inside the coating film, whereas the coating film of Example 17 blended with a polar amino acid was found to break inside the coating film. In addition, since it was ruptured at the substrate / sealer interface, it was confirmed that by adding a polar amino acid, the coating strength itself was enhanced and the adhesion to the substrate was also enhanced.

  Moreover, the coating film of Example 17 which mix | blended polar amino acid did not have the difference between test samples (No.1-4), and the same value was always obtained in the result of dry adhesion, and the result of adhesion after immersion. It was. From this, it can be seen that by adding a polar amino acid to a water-containing coating composition containing slaked lime, enhancement of the coating strength and adhesion strength can be obtained uniformly over the entire coating surface. Although this reason is not certain, it is thought that the dispersibility of the water-containing coating composition has been improved by adding a polar amino acid.

Experimental Example 4
The components listed in Table 5 were placed in a mixer for preparing a coating material and stirred to disperse the solid content in water, thereby preparing water-containing coating compositions (Examples 18 to 28, Comparative Example 5). In addition, the compound described in Table 4 was used as a chelate compound.

Next, 500 g of each of the water-containing coating compositions prepared was water-resistant film back [Saran-UB # 158: Asahi Kasei Co., Ltd .: thickness 15 μm (ASTM D-3985), oxygen permeability 10 ml / (m ² · day · MPa) (20 ° C., 75% RH) (ASTM D-3985), moisture permeability 1 g / (m ² · day) (38 ° C., 90% RH) (ASTM F-372)] It heat-sealed, deaerated to the state, and used for the performance evaluation test shown below.

<Softness stability of coating composition>
The water-containing coating compositions of Examples 18 to 28 and Comparative Example 5 housed in a film bag were stored at room temperature (20 ± 5 ° C.) and 0.5 hours, 24 hours and 48 hours after preparation. The softness (softness of the coating material) was observed and evaluated according to the following criteria. As shown in the following evaluation, the softness stability was evaluated for each water-containing coating composition based on the softness immediately after preparation.

Evaluation ◎: Very good as it is (has almost the same softness as immediately after preparation)
○: Although it is slightly tightened, the softness is easily recovered by squeezing the film back several times (returns to the same softness as at the time of preparation).
Δ: Slightly tight and tightened, it is necessary to squeeze the film back multiple times with a fairly strong force in order to return to the same softness as at the time of preparation (returns to the same softness as at the time of preparation).
X: It becomes a fairly tight state and becomes soft when the film back is sandwiched, but does not return to the same softness as in the preparation.

<Crack resistance of film>
Using the water-containing coating composition immediately after preparation, 24 hours after storage, and 48 hours after storage, apply a trowel while applying unevenness to the test plate (flexible plate) with a thickness of 1 to 10 mm (once) The film was left to dry for a whole day and night, and the film was observed for cracks. In addition, any water-containing coating composition was used after sufficiently squeezing the film back before application and adjusting to the same softness as at the time of preparation. In addition, as shown in the following evaluation, the crack resistance was evaluated as “◎” when no crack was observed, and “◯”, “Δ”, and “X” in order according to the degree of cracking.

Evaluation ◎: No cracks are observed. ○: Some cracks are observed in areas with undulating undulations, but no cracks are observed in almost all areas including flat parts. Δ: Cracks are also observed in flat parts. Cracks are noticeable.

  The results are also shown in Table 5.

  In the coating composition containing no polar amino acid or chelate compound (Comparative Example 5), the softness at the time of preparation gradually disappears in 0.5 hours from the preparation, and the contents in the film back aggregate in 24 hours. It became tight and water separation was slightly observed after 48 hours. On the other hand, the coating compositions containing only polar amino acids (Examples 18 to 19) were slightly suppressed in aggregation and kept soft, but were aggregated and tightened over time. However, when a chelate compound was used in combination (Examples 20 to 28), aggregation was significantly suppressed. In particular, sodium gluconate, EDTMP, and sodium ascorbate had softness during preparation even after storage for 48 hours. . From these results, it was found that thixotropy, which is a characteristic of a fluid containing slaked lime, can be relaxed and reduced by using a chelate compound in combination with a polar amino acid.

Regarding the crack resistance, the film formed with the water-containing coating composition of Comparative Example 5 was cracked in some places regardless of the storage period, regardless of the flat part and the undulated part of the film.
By adding a polar amino acid, it was possible to impart crack resistance to the coating composition (Examples 18 to 19). However, since the thixotropy of the coating composition cannot be sufficiently relaxed and reduced only by adding a polar amino acid, the effect of imparting cracking decreased as the storage period increased. On the other hand, the film formed with the water-containing coating composition (Examples 20 to 28) combined with the chelate compound could significantly suppress cracking regardless of the storage period. Preferably, a film formed of a water-containing coating composition containing sodium tartrate, sodium gluconate, EDTMP, and sodium ascorbate, particularly sodium gluconate and sodium ascorbate, shows no cracks regardless of the storage period. It was. From this, it is possible to prevent cracks at the initial drying stage of the coating containing slaked lime by using polar amino acids, and by using a polar amino acid and a chelate compound in combination, the initial drying of the coating can be performed regardless of the storage period. It was found that cracks can be prevented.

Experimental Example 5
The ingredients listed in Table 6 were put into a mixer for preparing a coating material and stirred to disperse the solid content in water, thereby preparing water-containing coating compositions (Examples 29 to 41, Comparative Example 6). About each of these water-containing coating compositions, the crack resistance of the film was evaluated by the following method.

(1) Crack resistance of film (presence of cracks due to forced drying)
Each of the above water-containing coating compositions was applied to a test plate (flexible plate) with unevenness with a thickness of 1 to 10 mm, and then forcedly dried by applying hot air from a dryer. About the formed dry film, the presence or absence of a crack was visually observed and evaluated according to the following criteria.

<Evaluation criteria>
◎: No cracks are observed at all. ○: Some cracks are observed at the places with uneven undulations, but no cracks are observed at most places including the flat part. △: Cracks are also observed at the flat part. Cracks are remarkably observed throughout.

(2) Crack resistance of the film (presence of cracks caused by bending)
Each of the above water-containing coating compositions was applied on a thick vinyl sheet using a roller to a thickness of about 0.5 mm, and then naturally dried over the whole day. The sheet having the coating layer thus obtained was subjected to the following test, and the crack resistance due to bending was evaluated according to the following criteria.

<Test method>
(2-1) Bend the sheet at 180 degrees, and visually observe whether the folds are cracked when opened.
(2-2) For the cracked sheet, bend the different part of this sheet 90 degrees again, and visually observe whether it cracks when opened.
(2-3) For a sheet that has not been cracked, repeat the opening process by bending it 90 degrees and evaluate how many times the crack occurs.

<Evaluation criteria>
A: No cracks are observed even when bent 180 degrees.
◯: Cracks were observed when bent 180 degrees, but no cracks were observed even when the operation of bending 90 degrees was performed three times.
(Triangle | delta): Although a crack was recognized when bent 180 degree | times, a crack is not recognized even if the operation opened by bending 90 degree | times is performed once.
X: Cracking occurred when the bending and opening operation was performed once.

  The test results of (1) and (2) are also shown in Table 6.

  As shown in Table 6, by adding a polar amino acid to a water-containing coating composition containing slaked lime as a film component, it imparts properties that are difficult to crack, that is, crack resistance, both by forced drying and by bending. (Examples 29 to 41). From this, it was found that by using a polar amino acid, the adhesion of the coating containing slaked lime to the base material can be enhanced and the coating can be given microelasticity. It was also found that the tendency to crack resistance and microelasticity was increased by increasing the blending amount of polar amino acids (Examples 30 and 31).

Experimental Example 6
The solid components listed in Table 7 were dispersed in water to prepare coating compositions in the form of paints (Examples 42 to 45, Comparative Example 7).

  Specifically, each component shown in Table 7 was placed in a mixer for preparing a coating material and stirred to disperse the solid content in water, thereby preparing water-containing coating compositions (Examples 42 to 45). For comparison, a coating composition (Comparative Example 7) was prepared in the same manner except that the polar amino acid and the chelate compound were not blended in the formulation of Example 44.

Next, 500 g of each water-containing coating composition prepared was water-resistant film back [Saran-UB # 158: Asahi Kasei Corporation: thickness 15 μm (ASTM D-3985), oxygen permeability 10 ml / (m ² · day · MPa) (20 ° C., 75% RH) (ASTM D-3985), moisture permeability 1 g / (m ² · day) (38 ° C., 90% RH) (ASTM F-372)] Heat-sealed while deaerated to the state. The appearance and properties (including the softness and fluidity of the coating material) were evaluated immediately after preparation and after standing at room temperature (20 ± 5 ° C.) for 48 hours. The results are shown in Table 7.

In the coating composition of Comparative Example 7, aggregation of the contents was already observed at the time of preparation, and after 48 hours, the aggregate was cured and became a very hard composition as a whole. This was thought to be due to the reaction of the silicon compound of diatomaceous earth with calcium ions of slaked lime to produce pozzolans (siliceous compounds). On the other hand, although the coating compositions of Examples 42 to 45 all contained a silicon compound, no adverse phenomenon (pozzolana) such as aggregation or curing was observed, and the coating composition was soft even after 48 hours. It had fluidity. From this, it was found that by adding a polar amino acid and a chelate compound to the coating composition containing slaked lime, it is possible to prevent the formation of pozzolanes by reacting with the silicon compound. Thus, it is possible to use zeolite or diatomaceous earth in addition to slaked lime as a film component of the water-containing coating composition, and as a result, the humidity control property of slaked lime can be reinforced. In addition, water glass (Na ₂ O · 2SiO ₂ /45% aqueous solution), which is an inorganic adhesive, may be used as a binder for the water-containing coating composition instead of organic compounds such as synthetic resin emulsions and polyvinyl alcohol. As a result, a 100% inorganic coating composition can be prepared.

Claims (10)

(C) characterized by blending at least one member selected from the polar amino acids Contact and the group consisting of salts, (a) lime and (b) flow improver method of coating compositions containing water . Furthermore, (d) a chelate compound is mix | blended, The fluidity improvement method of Claim 1 characterized by the above-mentioned. Characterized in that (c) and Contact polar amino acid is blended at least one selected from the group consisting of salts, with respect to (a) of lime and (b) a substrate of a coating composition containing water A method for improving adhesion or uniform stabilizing adhesion. Furthermore, (d) chelate compound is mix | blended, The adhesive force improvement or the uniform stabilization method of adhesive force of Claim 3 characterized by the above-mentioned. The method for improving adhesion force or uniformly stabilizing adhesion force according to claim 3 or 4, wherein the coating composition further comprises (f) a binder. A coating comprising a film formed from a water-containing coating composition having improved adhesion to the substrate or a uniform stabilization of adhesion by the method according to claim 3. Characterized by blending at least one member selected from (c) polar amino acids Contact and the group consisting of salts, (a) improved resistance to crazing of lime and (b) a coating composition containing a water Method. Furthermore, (d) a chelate compound is mix | blended, The crack-proof improvement method of Claim 7 characterized by the above-mentioned. The method for improving crack resistance according to claim 7 or 8, wherein the coating composition further comprises (f) a binder. A coating having a crack resistant film formed from a coating composition having improved crack resistance by the method according to any one of claims 7 to 9.