JPH09176521A - Coating composition and coated material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating composition giving a coating film having excellent stability, hydrophilicity, durability of the hydrophilicity, odor non-adsorbing property, etc., and provide a coating material having hydrophilicity suitable e.g. for an aluminum fin of a heat-exchanger of an air-conditioner. SOLUTION: The objective coating composition is produced by compounding a coating composition containing a water-soluble or water-dispersible resin with 0.1-200 pts.wt. (based on 100 pts.wt. of the solid resin component in the coating composition) of an alginic acid polyvalent metal salt (fine powder having an average particle diameter of 0.1-100μm). The coating material is obtained by forming a coating film of the composition (having a thickness of about 0.1-20μm) on a substrate made of aluminum, etc.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a coating composition capable of imparting high hydrophilicity and a coating material having a coating film obtained from the coating composition. The coating material has hydrophilicity, and is particularly suitable for aluminum fins of a heat exchanger for an air conditioner when aluminum is used as a base material.

[0002]

2. Description of the Related Art Recently, there has been a strong demand for a coating composition capable of imparting a hydrophilic coating film to the surface of a base material without impairing the original performance such as corrosion resistance. For example, in recent years, with the rapid spread of room air conditioners, the demand for fin materials for heat exchangers has greatly increased. However, for such fin materials, a paint having the above-mentioned special performance is required. There is.

That is, in the aluminum fin of the conventional heat exchanger for an air conditioner, the surface thereof is subjected to boehmite treatment or treatment with an acrylic coating liquid or water glass. The purpose of such treatment is to prevent corrosion of aluminum, and to prevent condensed water droplets generated during the operation of the air conditioner from quickly flowing on the fin surface and becoming water droplets on the fin surface. Recent heat exchangers have become smaller, and the aluminum fin spacing is 1.5 to 3 m.
This is because the width is as narrow as m, and if such a hydrophilic treatment is not performed, a bridge will be bridged between the fins by the condensed water droplets during operation, ventilation will be deteriorated, and heat exchange efficiency will be reduced.

[0004] However, it has been pointed out that the boehmite treatment is generally performed after fining, so that it is sufficient in terms of hydrophilic treatment but inferior in productivity. To solve this problem, a method has been developed in which a large amount of aluminum surface is treated by coating an acrylic coating liquid or water glass before fin processing. For example, JP-A-55-16426
Japanese Patent No. 4 discloses a coating material containing an aqueous resin, a surfactant and synthetic silica. However, although fins hydrophilically treated with such a coating are sufficiently excellent in hydrophilicity and anticorrosion property, there is a problem that the tool wears sharply when drilling the fins and the tool life is shortened. there were. This problem also occurred in the water glass treatment. Further, it has been found that the fin treated with water glass has a problem that it is severely damaged by acid rain.

Further, the fin material coated with an inorganic substance such as silica has a property of adsorbing an odor in the air and releasing it when the air conditioner is restarted, which causes a complaint of a bad odor during air conditioning.

On the other hand, a paint has been developed which imparts hydrophilicity and anticorrosion property, does not wear a processing tool, and is resistant to acid rain. For example, as disclosed in JP-A-63-258966, water, water-soluble resin, water-absorbing microgel, zirconium carbonate alkali metal salt or ammonia salt,
And a highly hydrophilic coating composition containing a surfactant as required. This paint can almost solve the above problems, and yet, while satisfying hydrophilicity, anticorrosion, and processability, the water-absorbing microgel is too good in water-absorbing microgel during operation of the heat exchanger. There is a problem that the condensed film absorbs water and swells, and the strength of the coating film becomes weak.

Further, in addition to the air conditioner, inconvenient scenes such as the wall of a bathroom, a closed room with little air flow, the inside of packing materials such as jewelry, valuables, electronic parts, etc., where condensation water droplets are generated are inconvenient in daily life. Although many can be seen, at present, there is no satisfactory and excellent method of preventing dew condensation against these.

[0008]

DISCLOSURE OF THE INVENTION The present invention provides a coating composition which is excellent in the stability, hydrophilicity, sustainability of hydrophilicity and non-adsorption of odor of a coating film, and for an air conditioner. An object of the present invention is to provide a coating material having hydrophilicity suitable for aluminum fins of a heat exchanger.

[0009]

The present invention has been made to solve the above problems, and is a coating composition containing a water-soluble or water-dispersible resin and a polyvalent metal salt of alginic acid. The content of the polyvalent metal salt is 0.1 to 2 with respect to 100 parts by weight of the resin solid content in the coating composition.
00 parts by weight.

The polyvalent metal salt of alginic acid is preferably fine particles having an average particle size of 0.1 to 100 μm, and the water-soluble or water-dispersible resin is preferably an alkyd resin,
Melamine resin, urea resin, phenol resin, acrylic resin, epoxy resin, polybutadiene resin,
It is a resin selected from the group consisting of fibrin derivative resin, aminoalkyd resin, benzoguanamine resin, vinyl chloride resin, vinyl resin, urethane resin, polyamide resin, polyester resin, polyacrylic acid resin. . The coating composition of the present invention can be applied as a coating material having a coating film obtained from the coating composition on a substrate by applying the coating composition on any substrate. Aluminum is preferably used as the base material of the coating material, and the thickness of the coating film can be 0.1 to 20 μm.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below.

(1) Water-Soluble or Water-Dispersible Resin The coating composition of the present invention contains a polyvalent metal alginate as a coating composition containing a water-soluble or water-dispersible resin.
It is manufactured by adding 0.1 to 200 parts by weight to 100 parts by weight of the resin solid content in the coating composition.

The water-soluble resin referred to here is 1 with respect to water.
A resin that dissolves by weight or more, for example, a water-soluble alkyd resin, a water-soluble melamine resin, a water-soluble phenol resin,
Water-soluble acrylic resin, water-soluble epoxy resin, water-soluble polybutadiene resin, water-soluble polyvinyl alcohol resin, water-soluble urethane resin, water-soluble vinyl acetate partially saponified resin,
Examples thereof include water-soluble polyethyleneimine resin and water-soluble fibrin derivative resin.

The water-dispersible resin does not exhibit solubility in water, but is self-dispersible in water and becomes an emulsion, or an emulsion in water by a suitable surfactant. The coating composition of the present invention is a resin and can be obtained by adding a polyvalent metal salt of alginic acid to a coating obtained by emulsifying these resins.

As the water-dispersible resin, fibrin derivative resin, phenol resin, alkyd resin, aminoalkyd resin, melamine resin, benzoguanamine resin, urea resin, vinyl chloride resin, vinyl resin, chlorinated rubber, epoxy resin, Examples thereof include urethane resins, polyamide resins, polyester resins, polyacrylic acid resins and the like.

Here, examples of the fibrin-derived resin include nitrocellulose, acetylcellulose, cellulose acetate propionate, and cellulose acetate butyrate.

Examples of the phenol resin include resol type phenol resin, alcohol-soluble phenol resin, oil-soluble phenol resin, rosin-modified phenol resin, alkylphenol resin and cashew resin.

Examples of the vinyl chloride resin include vinyl chloride homopolymers, vinyl chloride-vinyl acetate copolymers, vinyl chloride-vinylidene chloride copolymers, vinyl chloride-ethylene copolymers, ethylene-vinyl acetate copolymers. Examples thereof include a copolymer obtained by graft-polymerizing vinyl chloride in the united product.

Examples of the vinyl resin include butyral resin, styrene-butadiene copolymer, vinyl sol and the like. As the epoxy resin, a resin obtained by a polymerization reaction of a polyfunctional epoxy compound and a polyvalent amine curing agent such as diethylenetriamine or diaminodiphenylmethane or a polyphenol compound or a polyhydric alcohol compound such as bisphenol A, that is, Bisphenol A type epoxy resin obtained from epichlorohydrin and bisphenol A, cycloaliphatic type epoxy resin obtained from epichlorohydrin and cycloaliphatic derivative such as cyclopentadiene, glycidylamine type epoxy resin obtained from epichlorohydrin and hydantoin, polyvalent epoxy Examples thereof include an epoxy resin obtained from a compound and a polyvalent amine compound, an epoxy resin obtained from a polyvalent epoxy compound and a polyvalent alcohol compound, and the like.

Urethane resins include polyisocyanates (compounds having two or more isocyanate groups (-NCO) in one molecule) and polyols (active hydrogen groups (-) in one molecule).
Compounds having two or more of OH and —NH ₂ )), and polyisocyanates include tolylene diisocyanate, diphenylmethane diisocyanate, polymethylene polyphenyl polyisocyanate, tolidine diisocyanate, naphthalene diisocyanate and hexamethylene diisocyanate. , Isophorone diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, dicyclohexylmethane diisocyanate, and the like, and as the polyol,
Polypropylene glycol and its modified product, polytetramethylene glycol and its modified product, polymer polyol (acrylonitrile / styrene radical-polymerized in polypropylene glycol), polyether polyamine, condensed polyester polyol, lactone polyester polyol, polycarbonate polyol , Polybutadiene polyol, acrylic polyol, partially saponified ethylene-vinyl acetate strong polymer, phenolic polyol, phosphorus-containing polyol, halogen-containing polyol and the like.

The polyamide resin is a resin synthesized by polycondensation of dicarboxylic acid and diamine, polycondensation of ω-aminocarboxylic acid, ring-opening polymerization of lactam composed of ω-aminocarboxylic acid, and the like, and tetramethylenediamine and adipine are used. Polycondensate of acid salt (nylon 46), Ring-opening polymer of ε-caprolactamic acid or ε-aminocaproic acid (nylon 6), Polycondensate of hexamethyldiamine and adipate (nylon 66), hexamethylenediamine Polycondensate of succinate and sebacate (nylon 610), Polycondensation of hexamethylenediamine and dodecanedioate (nylon 6)
12), a ring-opening polymer of ω-aminoundecanoic acid (nylon 11), a ring-opening polymer of ω-laurolactam or ω-aminododecanoic acid (nylon 12), and the like.

The polyester resin is a resin obtained by a polycondensation reaction between a dibasic acid or a dibasic acid ester and a dihydric alcohol and having an ester bond in the main chain. Dibasic acids include phthalic anhydride, isophthalic acid, terephthalic acid, succinic acid, succinic anhydride, adipic acid, azelaic acid, sebacic acid, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, tetrabromophthalic anhydride, tetrachloro Examples thereof include phthalic anhydride, het anhydride, endomethylenetetrahydrophthalic anhydride, maleic anhydride, fumaric acid and itaconic acid, and examples of the dibasic acid ester include dimethyl terephthalate and dimethyl naphthalenedicarboxylate. As the dihydric alcohol, ethylene glycol, propylene glycol, 1,3-butylene glycol, 1,6-hexanediol, diethylene glycol, dipropylene glycol, neopentyl glycol, triethylene glycol, hydrogenated bisphenol A, bisphenol dihydroxypropyl ether, 1,4-butanediol, cyclohexane dimethanol, etc. are mentioned.

The polyacrylic acid resin is a resin composed of acrylic acid, methacrylic acid and its derivatives, and examples thereof include polymers such as methyl acrylate, ethyl acrylate, methyl methacrylate and acrylonitrile, and vinyl acetate, vinyl chloride, A copolymer with styrene or the like is also included.

In the present invention, those resins which are generally commercially available can be used. Moreover, you may use these 1 type or in mixture of 2 or more types.
Among these resins, as the water-soluble resin, water-soluble alkyd resin, water-soluble melamine resin, water-soluble phenol resin, water-soluble acrylic resin, water-soluble epoxy resin, water-soluble polyvinyl alcohol resin, water-soluble urethane resin, water-soluble A fibrin derivative resin and a water-soluble polyethyleneimine resin are preferable. As the water-dispersible resin, fibrin derivative resin, phenol resin, urea resin, vinyl resin, epoxy resin, polyurethane resin, polyamide resin are preferable.

(2) Polyvalent metal salt of alginic acid Alginic acid is one type of polysaccharide, and is mannuronic acid and its isomer, glucuronic acid (C ₅ H ₉ O ₅ .CO
It is a dehydrated polymer of OH). Alginic acid is usually obtained by treating a sodium carbonate extract of dried seaweed with hydrochloric acid.
The polyvalent metal salt of alginic acid of the present invention has a structure in which alginic acid is crosslinked with a polyvalent metal ion, and unlike alginic acid, it is insoluble in water. Further, the polyvalent metal salt of alginic acid may have a gel state when it is simply cross-linked with a polyvalent metal ion, but in the present invention, it is a fine powder, preferably an average particle size measured by a laser light scattering method is 0. It is desirable to prepare a granular form (bead form) of about 1 to 100 μm before use.

Such a polyvalent metal salt of alginic acid can be obtained, for example, by preparing an aqueous solution of a monovalent metal salt of alginic acid and an alkali metal such as sodium or potassium into fine particles by a spray drying method, an emulsion method or the like, and then forming the polyvalent metal salt. It can be obtained by immersing in an aqueous solution containing ions. In addition, an aqueous solution of the monovalent metal salt of alginic acid or one obtained by treating it with an acid is stirred in an aqueous solution having polyvalent metal ions, and then the insoluble matter is separated, dried and pulverized to obtain a granular material. Good.

Here, as the polyvalent metal salt, calcium, zinc, beryllium, magnesium, barium, cadmium, mercury, strontium, radium, lead, copper,
Examples thereof include metal salts with iron, aluminum, cobalt, nickel, chromium, manganese and the like. Among them, calcium alginate, zinc alginate, magnesium alginate and barium alginate are preferable, and calcium alginate is particularly preferable.

Calcium alginate is characterized in that it has excellent water absorbency and that there is almost no difference in shape and size even when it absorbs moisture. FIG. 1 shows the results of measuring the water respiration of calcium alginate beads. This is because the sample pre-dried in an atmosphere of 20% relative humidity was placed in an atmosphere of 95% relative humidity, the weight change was recorded, and when equilibrium was reached (the sample was placed in an atmosphere of 95% relative humidity). 100 hours after the start), the sample was moved again to a relative humidity atmosphere of 20%, and the change in weight was recorded. It can be seen that the calcium alginate beads have a higher water respiration property than silica gel, zeolite, or microcrystalline cellulose that is usually used as a granular filler.

FIGS. 2 and 3 show the particle size distribution of calcium alginate beads and cellulose fine particles (trade name AC powder, manufactured by Nisshinbo Industries Inc.) in the air and in water using a laser particle sizer. It is the result measured by the scattering method. The calcium alginate beads have an average particle size in air of 35 μm and an average particle size in water of 38 μm, which means that the particles do not substantially swell even in water and do not significantly differ from those in air (Fig. 2). On the other hand, regarding the cellulose fine particles, the average particle diameter in air is 40 μm, and the average particle diameter in water is 60 μm (FIG. 3).

As described above, the polyvalent metal salt of alginic acid of the present invention has both high water breathability and excellent dimensional stability when absorbing moisture. It is possible to obtain a coating composition having excellent properties and coating film stability.

The amount of the polyvalent metal alginate used in the present invention is 0.1 to 200 parts by weight, preferably 0.1 to 200 parts by weight based on 100 parts by weight of the resin solid content of the water-soluble or water-dispersible resin. It is 100 parts by weight. If the polyvalent metal salt of alginic acid is less than 0.1 parts by weight with respect to 100 parts by weight of the resin solid content in the coating composition, the hydrophilic effect cannot be obtained. On the other hand, if the amount is more than 200 parts by weight, the mechanical strength of the formed coating film becomes low and peeling of the coating film easily occurs, which is not preferable.

(3) Coating Composition of the Present Invention The coating composition of the present invention can be obtained as follows. That is, first, a water-soluble or water-dispersible resin is dissolved or dispersed in water. The resin concentration at this time is 0.1
30% by weight is preferred. Further, many water-soluble or water-dispersible resins for paints are often commercially available in the state of being dissolved or dispersed in water, and water is added to them.
It is preferable to use the resin with a resin concentration of 0.1 to 30% by weight. If the resin concentration is within this range, the coating is too thin and the strength is reduced because the concentration is too thin, or the coating is too thick and the aluminum fin of the air conditioner is used because the concentration is too thick. The heat exchange efficiency does not deteriorate.

Then, a polyvalent metal salt of alginic acid is added to and mixed with the above-mentioned resin aqueous solution or resin dispersion. Any device may be used for mixing, and for example, a kneader, a mixer, an impeller stirrer or the like can be used.

The coating composition of the present invention may be appropriately blended with a known resin curing agent, curing catalyst or the like depending on the type of resin used. For example, when an epoxy resin is used, aliphatic polyamines such as diethylenetriamine, triethylenetetraamine, tetraethylenepentamine, diethylaminopropylamine; bisphenol A
And an adduct of an aliphatic polyamine, an adduct of an amine compound and an alkyl epoxy, a cyanoethylated polyamine obtained from an amine compound and acrylonitrile; a modified aliphatic polyamine such as a reaction product of an amine compound and ethylene oxide or propylene oxide; metaphenylenediamine, diaminodiphenylmethane, Diaminodiphenyl sulfone, metaxylene diamine, meta aminobenzyl amine, benzine, 4-chloro-O-phenylenediamine, bis (3,4-diaminophenyl) sulfone, 2,
Aromatic polyamines such as 6-diaminopyridine; Modified aromatic polyamines; Alicyclic polyamines such as 3,3-dimethyl-4,4'-diaminodicyclohexylmethane, N-aminoethylpiperazine, 3,9-bis (3- Aminopropyl) -2,4,8,10-tetraoxospiro-
Modified alicyclic polyamine such as modified product of (5,5) -undecane; amine compound such as polyamidoamine, modified polyamidoamine, polyethyleneimine, benzyldimethylamine, 3,4 such as 2,4,6-trisdimethylaminomethylphenol Secondary amines; urea / melamine / formalin compounds, aliphatic acids, aliphatic acid anhydrides such as dodecenyl succinic anhydride, alicyclic acids, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methylendomethylenetetrahydrophthalic anhydride, etc. Alicyclic anhydrides; aromatic acid anhydrides such as aromatic acids and phthalic anhydride; other halogenated acids, halogenated acid anhydrides, dicyandiamide, dicyandiamide acid anhydrides, zinc borofluoride, boron halide complex salts, Organotin compounds, organometallic complex salts, polythiols, phenols and their derivatives, Isocyanate compounds, may contain a curing agent such as blocked isocyanate.

In addition to the polyvalent metal alginate, a nonionic, anionic or cationic surfactant is added to the coating composition of the present invention to improve the dispersibility of the resin in water. Further, the hydrophilicity of the coating film can be further improved, and the dispersibility of the polyvalent metal alginate salt in water can be improved.

As the nonionic surfactant, polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether and other polyoxyethylene alkyl ethers, polyoxyethylene octyl phenyl ether, polyoxyethylene alkyl allyl ether, Polyoxyethylene derivative,
Examples thereof include sorbitan fatty acid esters such as oxyethylene / oxypropylene block copolymers, sorbitan monolaurate, sorbitan monostearate, and sorbitan trioleate, glycerin fatty acid esters, and polyoxyethylene fatty acid esters.

Examples of the anionic surfactant include fatty acid salts such as sodium stearate and potassium oleate, sodium lauryl sulfate, triethanolamine lauryl sulfate, alkyl sulfates such as ammonium lauryl sulfate, alkylbenzene sulfonates, and alkylnaphthalene sulfone. Acid salt, alkyl sulfosuccinate,
Examples thereof include alkyl diphenyl ether disulphonate, alkyl phosphate, and polyoxyethylene alkyl sulfate ester salt.

Examples of the cationic surfactant include stearylamine acetate, alkylamine salts such as stearylamine hydrochloride, lauryltrimethylammonium chloride, stearyltrimethylammonium chloride,
Examples thereof include quaternary ammonium salts such as distearyldimethylammonium, alkyl betaines such as lauryl betaine and stearyl betaine, and amine oxides.

The concentration of the surfactant added is preferably 0.01 to 1% by weight based on the total coating composition. The coating composition of the present invention further includes a colorant such as a pigment or a dye, a filler, a lubricant, a defoaming agent, a leveling agent, an antifungal agent, if necessary.
A deodorant, an antibacterial agent, etc. can be added.

(4) Coating Material of the Present Invention The coating material of the present invention is obtained by applying the coating composition of the present invention described above onto a substrate such as aluminum and curing and drying the same. The surface has a coating film obtained from the coating composition. Examples of the base material of the covering material include metal plates such as aluminum and iron and metal molded products; plastic films such as polyester films and olefinic films; nonwoven fabrics such as polyester nonwoven fabrics and polypropylene nonwoven fabrics; glassy plates; Of these, aluminum used for aluminum fins for air conditioners is particularly suitable.

The method of coating the substrate is not particularly limited. For example, brush coating, spray coating, roll coating, or
It can be applied by any method such as a shake-off coat. After coating, air dry or heat, ultraviolet rays, electron beam,
Cure using ionizing radiation such as microwaves. In particular, the aluminum surface is coated by a method such as roll coating, spraying or shower coating, and the
It is cured and dried at a temperature of 350 ° C., preferably 100 to 280 ° C. It is also possible to use ionizing radiation such as ultraviolet rays, electron beams or microwaves for curing the resin.

The thickness of the coating film formed on the substrate is 0.1.
It is preferable that the dry film thickness is 0.1 to 20 μm, and more preferably 0.1 to 10 μm, especially in the fin material application of an air conditioner.

[0043]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples.

<Example 1: Preparation example 1 of calcium alginate beads> An aqueous sodium alginate solution prepared by dissolving 700 kg of sodium alginate obtained from dried seaweed in 10 times the amount of water was added to 5000 kg of n-hexane.
Oil layer as polyglycerin condensed ricinoleic acid ester (Taiyo Kagaku Co., Ltd., trade name: Sunsoft 818H)
7.7 Kg was used and emulsified with a homomixer. This emulsion is used as a 20% by weight aqueous solution of calcium chloride (6000 kg).
The mixture was poured into and ion-crosslinked to produce water-insoluble and spherical calcium alginate particles. After washing with water and drying, 49
0 kg calcium alginate particles (average particle size 0.5μ
m).

<Example 2: Preparation example 2 of calcium alginate beads> A sodium alginate aqueous solution prepared by dissolving 700 kg of sodium alginate obtained from dried seaweed in 10 times the amount of water was spray drier (manufactured by Niro Co., Ltd.). Fine particles were formed by spray drying (internal temperature: 230 ° C.) using a Mobilminer type atomizer), and then contacted with a 20 wt% calcium chloride aqueous solution to produce water-insoluble and spherical calcium alginate particles. After washing with water and drying, 500 kg of calcium alginate particles (average particle size 18 μm) were obtained.

Example 3 Water-soluble polyhydric epoxy compound (polyethylene glycol diglycidyl ether, oxyethylene unit = 4,192 Weight per epoxy, trade name: Denacol, EX-821, manufactured by Nagase Kasei Co., Ltd.) Was added to prepare a solid concentration of 12.3%. To 100 ml of this aqueous solution, 5 g of calcium alginate beads prepared in Example 1 was added and mixed with a mixer. Further, as a catalyst, 5 g of a 45% zinc borofluoride aqueous solution (manufactured by Hashimoto Kasei Co., Ltd.) was added. The coating composition thus obtained contains 40.7 parts by weight of a polyvalent metal alginate salt per 100 parts by weight of the resin solid content.

This coating composition was cast on a phosphoric acid chromate-treated aluminum plate with a doctor knife coater and heated at 120 ° C. for 3 minutes to be cured. The water-drop contact angle of the coating film of the obtained coating material was measured with a contact angle meter (CT-DA / A contact angle meter manufactured by Kyowa Interface Science Co., Ltd.) to evaluate hydrophilicity. In addition, as a strength (hardness to peeling) test of the coating film, the dried coating film surface was rubbed strongly with cellulose paper (Kimwipe, manufactured by Tojo Kimberley Co., Ltd.) 50 times, and then the coating surface was immersed in water. After completely wetting, rub strongly again with cellulose paper 50 times. As a result, no change was observed in the coating film ⊚, peeling was observed but there was partial thinning, and partial peeling was observed. The sample was evaluated as Δ, and the sample with large peeling was evaluated as ×. Each result,
Coating thickness (Mitutoyo Corporation, film thickness meter IDC
(Measured at −112) and shown in Table 1.

Example 4 35 g of dimethylolurea was added to 250 ml of water and dissolved. Further, 3 g of ammonium sulfate was added as a catalyst. 100 ml of this aqueous solution
To the calcium alginate beads prepared in Example 1
0 g was added and mixed with a mixer. The coating composition thus obtained contains 65.8 parts by weight of a polyvalent metal alginate salt with respect to 100 parts of the resin solid content. This coating composition was applied onto a phosphoric acid chromate treated aluminum plate with a doctor knife coater,
C. was heated for 3 minutes to cure. The water drop contact angle and the coating film strength were measured by the method of Example 3.

Example 5 Water was added to a water-based acrylic resin paint (trade name: Wako Shin Paint Co., Ltd., water-based varnish for woodworking / clear clear) to prepare a solid content concentration of 9%. To 100 ml of this aqueous solution, 10 g of calcium alginate beads prepared in Example 1 was added and mixed with a mixer. The coating composition thus obtained contains 111 parts by weight of the polyvalent alginic acid metal salt per 100 parts by weight of the resin.

This coating composition was applied onto a polyester film (a) and a polyester nonwoven fabric (b) with a doctor knife coater, and heated at 120 ° C. for 3 minutes to cure. For each of them, the water drop contact angle and the coating film strength were evaluated in the same manner as in Example 3. The results are shown in Table 1 together with the coating thickness.

Example 6 Water was added to Oshika Resin 311 (an aqueous solution of a melamine / urea co-condensation resin, manufactured by Oshika Shinko Co., Ltd.) to prepare a solid content concentration of 5%. To 100 ml of this paint, 2 g of calcium alginate beads prepared in Example 1 was added and mixed with a mixer. The coating composition thus obtained contains 40 parts by weight of a polyvalent metal alginate salt with respect to 100 parts of the resin solid content. Apply this coating composition on a phosphoric acid chromate treated aluminum plate with a doctor knife coater,
It was heated at 120 ° C. for 3 minutes to be cured. The water drop contact angle and the coating film strength were measured by the method of Example 3. Table 1 shows the results.
Shown in

Example 7 Water was added to Sony Bond SC801 (styrene-butadiene rubber water latex, manufactured by Sony Chemical Co., Ltd.) to prepare a solid concentration of 5%. To 100 ml of this paint, 2 g of calcium alginate beads prepared in Example 1 was added and mixed with a mixer. The coating composition thus obtained contains 40 parts by weight of a polyvalent metal alginate salt with respect to 100 parts of the resin solid content. This coating composition was applied onto a phosphoric acid chromate-treated aluminum plate with a doctor knife coater and heated at 120 ° C. for 3 minutes to be cured. The water drop contact angle and the coating film strength were measured by the method of Example 3. The results are shown in Table 1

Example 8 Water was added to Oshika Resin D-17 (aqueous solution of phenol resin, manufactured by Oshika Shinko Co., Ltd.) to prepare a solid content concentration of 5%. This paint 100
2 g of the calcium alginate beads prepared in Example 1 was added to ml and mixed with a mixer. The coating composition thus obtained contains 40 parts by weight of a polyvalent metal alginate salt with respect to 100 parts of the resin solid content. This coating composition was applied onto a phosphoric acid chromate treated aluminum plate with a doctor knife coater,
C. was heated for 3 minutes to cure. The water drop contact angle and the coating film strength were measured by the method of Example 3. Table 1 shows the results.

<Example 9> Movinyl AD-35 (vinyl acetate resin aqueous emulsion, Hoechst Synthetic Co., Ltd.)
Was prepared by adding water to the product). To 100 ml of this paint, 2 g of calcium alginate beads prepared in Example 1 was added and mixed with a mixer. The coating composition thus obtained contains 40 parts by weight of a polyvalent metal alginate salt with respect to 100 parts of the resin solid content. This coating composition was applied onto a phosphoric acid chromate-treated aluminum plate with a doctor knife coater and heated at 120 ° C. for 3 minutes to be cured. The water drop contact angle and the coating film strength were measured by the method of Example 3.

<Example 10> Water was added to morobin EM10 (polyurethane resin aqueous emulsion, manufactured by Nisshinbo Industries Inc.) to prepare a solid component concentration of 5%. To 100 ml of this paint, 2 g of calcium alginate beads prepared in Example 2 was added and mixed with a mixer. The coating composition thus obtained has a resin solid content of 100
40 parts by weight of the polyvalent alginic acid metal salt is mixed with the parts. This coating composition was applied onto a phosphoric acid chromate-treated aluminum plate with a doctor knife coater and heated at 120 ° C. for 3 minutes to be cured. The water drop contact angle and the coating film strength were measured by the method of Example 3.

Example 11 The calcium alginate beads of Example 1 were suspended in water to 15 (W / W%). To 5 g of this solution, 0.1 g of a water-soluble urea resin condensate (trade name: Sumitex Resin 250conc, Sumitomo Chemical Co., Ltd.) and an amine catalyst (trade name: Sumitec acx, Sumitomo Chemical Co., Ltd.) were added. The coating composition thus obtained contains 17.2 parts by weight of a polyvalent metal arginine acid salt with respect to 100 parts of the resin solid content. This coating composition was applied onto a phosphoric acid chromate treated aluminum plate with a doctor knife coater, and 1
It was cured by heating at 20 ° C. for 3 minutes. The water drop contact angle and the coating film strength were measured by the method of Example 3.

<Comparative Examples 1 to 9> Coating compositions having the same composition as the coating compositions of Examples 3 to 11 except that calcium alginate beads were not included were prepared and coated on a substrate in the same manner as in each Example. A coating film was formed on. Comparative Example 1
To 9.

About the coating films of these coating materials, Example 3
The water drop contact angle and the coating film strength were evaluated in the same manner as in. The results are shown in Table 1.

[0059]

[Table 1]

As can be seen from these results, the coating film obtained from the coating composition of the present invention has a smaller water drop contact angle than the coating film obtained from the coating composition of Comparative Example containing no polyvalent metal alginate. It has excellent hydrophilicity.

[0061]

EFFECT OF THE INVENTION The coating composition of the present invention provides a film having excellent hydrophilicity, and particularly when it is applied to a surface of aluminum and used as a fin material, excellent effects are exhibited.

[Brief description of the drawings]

FIG. 1 is a diagram showing a change in water content of each compounding agent with respect to a change in humidity for comparing the water respiration of calcium alginate of the present invention with silica gel, zeolite, and microcrystalline cellulose.

FIG. 2 is a graph showing changes in average particle diameter with respect to changes in humidity for examining the dimensional stability of calcium alginate of the present invention.

FIG. 3 is a diagram showing a change in average particle diameter of cellulose fine particles with respect to a change in humidity, for comparing the dimensional stability of calcium alginate of the present invention and cellulose fine particles (AC powder; manufactured by Nisshinbo Co., Ltd.).

[Explanation of symbols]

1 ... Curve showing water content of calcium alginate beads 2 ... Curve showing water content of silica gel 3 ... Curve showing water content of zeolite 4 ... Water content of microcrystalline cellulose Curves 5 ... Particle size distribution curve of calcium alginate beads measured in air 6 ... Particle size distribution curve of calcium alginate beads measured in water 7 ... Particle size distribution curve of cellulose fine particles measured in air 8. ..Particle size distribution curve of cellulose fine particles measured in water

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area C09D 7/12 PSJ C09D 7/12 PSJ 201/00 PDD 201/00 PDD

Claims (6)

[Claims] 1. A coating composition comprising a water-soluble or water-dispersible resin and an alginic acid polyvalent metal salt, wherein the content of the alginic acid polyvalent metal salt is 100 parts by weight of a resin solid content in the coating composition. 0.1 to 200 parts by weight,
Coating composition. 2. The alginic acid polyvalent metal salt has an average particle size of 0.
The coating composition according to claim 1, which is a fine particle having a size of 1 to 100 µm. 3. The water-soluble or water-dispersible resin is an alkyd resin, melamine resin, urea resin, phenol resin, acrylic resin, epoxy resin, polybutadiene resin, fibrin derivative resin, aminoalkyd. Resin,
The coating composition according to claim 1 or 2, which is a resin selected from the group consisting of benzoguanamine-based resins, vinyl chloride-based resins, vinyl-based resins, urethane-based resins, polyamide-based resins, polyester-based resins, and polyacrylic acid-based resins. . 4. A coating material having a coating film obtained from the coating composition according to claim 1 on a substrate. 5. The coating material according to claim 4, wherein the base material is aluminum. 6. The film thickness of the coating film is 0.1 to 20 μm,
The coating material according to claim 4 or 5.