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The present invention relates to a novel water-dispersible coating composition for metal corrosion protection. More specifically, the present invention relates to a water-dispersed anticorrosion coating composition containing a water dispersion of a specific chelate-reactive epoxy resin and an active organic curing agent. A paint composition that has excellent adhesion and corrosion resistance to not only rust-free copper plates and derusted steel plates, but also rusted steel plates or poorly prepared steel plates, galvanized steel plates, aluminum, stainless steel, etc. It is related to. Conventional water-dispersed epoxy resin paints have significantly inferior adhesion and especially corrosion resistance compared to solvent-based epoxy resin paints, and cannot be used as metal protection paints for rust prevention purposes, and are mainly used as mastic paints for building materials. is the main use. The purpose of the present invention is to provide a resin composition for a water-dispersed epoxy resin paint that has excellent adhesion to metals and corrosion resistance, and the present inventors have made extensive efforts for this purpose. As a result of research, we have arrived at the present invention. That is, the coating composition of the present invention contains (A) one or more P-OH bonds selected from orthophosphoric acid, metaphosphoric acid, pyrophosphoric acid, phosphorous acid, polyphosphoric acid, phosphonic acid, and phosphinic acid as an essential component. (B) an aqueous dispersion of a resin that can be cured with an epoxy resin curing agent obtained by heat-treating at least one phosphorus acid, ester or salt thereof, and an epoxy resin in a proportion that leaves epoxy groups; It is characterized by containing an active organic curing agent for epoxy resin. The precondensate, which is an essential component of the composition of the present invention, is a mixture of an epoxy resin and a phosphoric acid, a hydroxyl group-containing phosphate ester, or a salt thereof in the presence of a solvent or in a proportion that leaves the epoxy group. Obtained by heat treatment in its absence. The heating temperature is not particularly limited, but it is preferably 50 to 130°C in order to prevent decomposition of the epoxy resin and to complete the reaction in an appropriate time. The epoxy resin used here has the formula
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æ¿ã®å¡èæ§èœè©Šéšçµæãè¡šïŒã«ç€ºãã[Formula] (Z is H, CH 3 , C 2 H 5 group) A variety of compounds can be used, such as those having more than one substituted or unsubstituted glycidyl ether group in the molecule, and the epoxy equivalent is not particularly limited, but preferably has an epoxy equivalent of 200 to 1000
Something of a certain degree is good. At least one P-OH used in the present invention
Examples of the phosphorus acid having a bond include orthophosphoric acid, metaphosphoric acid, pyrophosphoric acid, phosphorous acid, polyphosphoric acid, phosphonic acid, and phosphinic acid, with orthophosphoric acid being particularly preferred. Examples of phosphorus acid esters include the above-mentioned phosphorus acid esters, preferably alkyl esters having up to about 8 carbon atoms (those having one or more hydroxyl groups) and hydroxyalkyl esters, such as:
Examples include those having groups such as ethyl, n-butyl, 2-ethylhexyl, hydroxyethyl, hydroxybutyl, hydroxypropyl, hydroxypentyl, etc. Mono- or di-phosphate esters of n-butyl or 2-ethylhexyl are particularly preferred. Examples of phosphorus acid salts include the above-mentioned phosphorus acid salts, such as potassium, sodium, lithium, calcium, zinc, aluminum, tin, barium, etc. salts, particularly potassium, sodium, or calcium salts. Secondary phosphates are preferred. The reaction between epoxy resin and phosphoric acids is that the hydroxyl group of phosphoric acid is
It is preferable to carry out at a ratio of 0.05 to 0.9 equivalent, preferably 0.05 to 0.4 equivalent, and the epoxy equivalent of the produced modified epoxy resin (precondensate) is preferably 3000 or less. The precondensate thus obtained can be easily made into an aqueous dispersion by using a known nonionic, anionic or cationic surfactant. The concentration of the aqueous dispersion (emulsion) is 40-90% by weight, preferably 50-70% by weight. The active organic curing agent used in the present invention includes:
All curing agents for ordinary epoxy resin paints can be used, such as aliphatic polyamines, aromatic modified polyamines, aliphatic modified polyamines, polyamides, amino resins, carboxylic acids, etc. An amount of curing agent is used. The curing agent can be made into an emulsion in the same manner as the resin. Furthermore, the composition of the present invention may contain other epoxy resins, diluents, solvents, color pigments, anti-corrosion pigments, if necessary.
Fillers and other additives can be used in combination. The coating composition of the present invention can be dried naturally to form a coating film, but if necessary, the desired coating film can also be obtained by forced drying by heating or the like. Hereinafter, the present invention will be explained in detail with reference to Examples.
Note that parts in the examples are based on weight. Example 1 100 parts of bisphenol A diglycidyl ether (epoxy equivalent = 380) and adeca glycilol
15 parts of ED-503 (epoxy equivalent = 180) and 6 parts of orthophosphoric acid were mixed and reacted at 80°C for 5 hours to obtain a precondensate. The obtained precondensate is referred to as []. Precondensate [] 100 parts and Adekanol NK-
511 (manufactured by Asahi Denka Kogyo, anionic surfactant, 30%
Add 30 parts of aqueous solution) and stir with a homomixer.
Next, add 54 parts of water and continue stirring for 30 minutes. Polyamide (amine value =
340) Add 15 parts of this blended resin to steel plate (JIS G3141)
After applying the film to a film thickness of 150Ό and curing it at room temperature for one week, we conducted a film performance comparison test as shown in Table 1.
Both adhesion and corrosion resistance were significantly superior to the comparative example. Example 2 100 parts of bisphenol F diglycidyl ether (epoxy equivalent = 280), 50 parts of diglycidyl ether of bisphenol A propylene oxide adduct (epoxy equivalent = 340), and 17 parts of dibasic potassium phosphate were mixed. The precondensate obtained by carrying out the stirring reaction at 110°C for 5 hours is referred to as []. Precondensate [] 100 parts and Adekanol NK-
Add 30 parts of 511 and stir with a homomixer. Next, add 54 parts of water and continue stirring for 30 minutes. Adeka Hardener EH-551 (amine value = 280,
As a result of adding 15 parts of Asahi Denka product name) and using this blended resin to create a painted board in the same manner as in Example 1, the results were as follows:
Both adhesion and corrosion resistance were significantly superior to the comparative example. Example 3 Novolak epoxy resin (epoxy equivalent =
180), 50 parts of diglycidyl ether (epoxy equivalent = 310) of bisphenol F/ethylene oxide adduct, and 15 parts of dihydroxybutyl pyrophosphoric acid were mixed and reacted with stirring at 95°C for 6 hours. Let the precondensate obtained be [ ]. Precondensate [] 100 parts and Adekanol 961S
Add 20 parts of (manufactured by Asahi Denka Kogyo, nonionic surfactant, 70% aqueous solution) and stir with a homomixer.
Then, gradually add 53 parts of water and continue stirring for 30 minutes. Obtained epoxy emulsion (solid content = 60
%), 20 parts of modified polyamide deca hardener EH-203 (amine value = 280, manufactured by Asahi Denka Co., Ltd.) as an epoxy resin curing agent was added to 100 parts, and a plate was coated in the same manner as in Example 1 using this blended resin. As a result, both adhesion and corrosion resistance were significantly superior to the comparative example. Example 4 100 parts of bisphenol F diglycidyl ether (epoxy equivalent = 340), 20 parts of diglycidyl ether of bisphenol A propylene oxide adduct (epoxy equivalent = 500), and 8 parts of monoethyl phosphate were mixed. The reaction was stirred at 85°C for 7 hours to obtain a precondensate. The obtained precondensate []
shall be. Precondensate [] 100 parts and Adekanol
Add 15 parts of 961S and stir with a homomixer. Next, 65 parts of water is added and stirring is continued for an additional 30 minutes.
Obtained epoxy emulsion (solids content 64%)
To 100 parts, 12 parts of modified aliphatic amine Adeka Hardener EH-218 (amine value = 380, trade name manufactured by Asahi Denka Kogyo Co., Ltd.) was added as an epoxy resin curing agent.
This compounded resin is applied to a rusted steel plate (a steel plate that has been exposed outdoors for one year to remove loose rust) to a film thickness of 150Ό,
After curing at room temperature for one week, a coating film performance comparison test was conducted as shown in Table 1. As a result, both adhesion and corrosion resistance were significantly superior to the comparative example. Comparative Example 1 100 parts of unmodified bisphenol A diglycidyl ether (epoxy equivalent = 380), 15 parts of Adeka Glycilol ED-503, and Adekanol NK-511
Add 35 parts and stir with a homomixer. Then water
Gradually add 73 parts and continue stirring for 30 minutes. Polyamide (amine value = 340) was added as a curing agent to 100 parts of the obtained epoxy emulsion (solid content = 60%).
20 parts of the resin was added, and this blended resin was applied to a steel plate (JIS G 3141) to a film thickness of 150Ό, and cured at room temperature for one week to prepare a coated plate. Comparative Example 2 100 parts of bisphenol F diglycidyl ether (epoxy equivalent = 280), 50 parts of diglycidyl ether of bisphenol A propylene oxide adduct (epoxy equivalent = 340), and Adekanol
Add 45 parts of NK-511 and stir with a homomixer. Next, 102 parts of water was gradually added and stirring was continued for 30 minutes. Obtained epoxy emulsion (solid content =
55%) Adeka Hardener EH-551 of modified aromatic amine as epoxy resin hardener for 100 parts
(Amine value = 280) was added, and a coated board was prepared in the same manner as in Comparative Example 1 using this blended resin. Comparative example 3 Novolak epoxy resin (epoxy equivalent =
180), 50 parts of diglycidyl ether (epoxy equivalent = 310) of bisphenol F/ethylene oxide adduct, and 20 parts of Adekanol 961S,
Stir with a homo mixer. Then gradually add 100 parts of water and continue stirring for 30 minutes. Comparative Example 1 was prepared by adding 30 parts of modified polyamide deca hardener EH-203 (amine value = 280) as an epoxy resin curing agent to 100 parts of the obtained epoxy emulsion (solid content = 60%), and using this blended resin. I created a painted board in the same way. Comparative Example 4 100 parts of bisphenol F diglycidyl ether (epoxy equivalent = 340), 20 parts of diglycidyl ether of bisphenol A propylene oxide adduct (epoxy equivalent = 500), and Adekanol
Add 20 parts of 961S and stir with a homomixer. Then add 70 parts of water and continue stirring for an additional 30 minutes. The obtained epoxy emulsion (solid content = 60
%), 10 parts of ADEKA Hardener EH-218 (amine value = 380), a modified aliphatic amine, was added as an epoxy resin hardener, and this blended resin was applied to a rusted steel plate in the same manner as in Example 4. Make the film thickness 150Ό,
It was cured at room temperature for one week. Table 1 shows the coating film performance test results of the coated plates prepared in Examples 1 to 4 and Comparative Examples 1 to 4.
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é±é宀枩æŸçœ®ããŠã硬åããªãã€ãã[Table] Example 5 28 parts of sodium pyrophosphate was mixed with 100 parts of bisphenol A diglycidyl ether (epoxy equivalent = 380) and reacted at 80°C for 5 hours to obtain a precondensate [ ] (epoxy equivalent =755). An epoxy emulsion was obtained in the same manner as in Example 1 using 100 parts of the precondensate, and 15 parts of polyamide (amine value = 340) was added as an epoxy resin curing agent, and coating film performance was evaluated in the same manner as in Example 1. Examined. The results are shown in Table 2. Example 6 5 parts of phosphorous acid was mixed with 100 parts of bisphenol F diglycidyl ether (epoxy equivalent = 480) and reacted at 80°C for 5 hours to obtain a precondensate [ ] (epoxy equivalent = 755) . An epoxy emulsion was obtained in the same manner as in Example 1 using 100 parts of the precondensate [], and a modified aromatic amine Adeka hardener EH-541S (amine value =
280 (trade name, manufactured by Asahi Denka Kogyo Co., Ltd.) was added, and the coating film performance was examined in the same manner as in Example 1. The results are shown in Table 2. Example 7 Add adeca glycilol to 100 parts of bisphenol A diglycidyl ether (epoxy equivalent = 380)
Mix 2 parts of polyphosphoric acid with 20 parts of ED-501 (epoxy equivalent = 300, product name manufactured by Asahi Denka Kogyo Co., Ltd.) and heat at 80°C x 5
The reaction was carried out for a period of time to obtain a precondensate (epoxy equivalent = 850). An epoxy emulsion was obtained in the same manner as in Example 1 using 100 parts of the precondensate, and 15 parts of polyamide (amine value = 340) was added as an epoxy resin curing agent, and coating film performance was evaluated in the same manner as in Example 1. Examined. The results are shown in Table 2. Example 8 100 parts of bisphenol F diglycidyl ether (epoxy equivalent = 480) and adeca glycilol
Mix 3 parts of phosphonic acid with 20 parts of ED-501 (epoxy equivalent = 300, trade name manufactured by Asahi Denka Kogyo Co., Ltd.) and heat at 80°C x 5
The reaction was carried out for a period of time to obtain a precondensate (epoxy equivalent = 770). An epoxy emulsion was obtained in the same manner as in Example 1 using 100 parts of the precondensate, 17 parts of polyamide (amine value = 340) was added as an epoxy resin curing agent, and coating film performance was evaluated in the same manner as in Example 1. Examined. The results are shown in Table 2. Example 9 3 parts of phosphinic acid was mixed with 100 parts of bisphenol A diglycidyl ether (epoxy equivalent = 380) and reacted at 80°C for 5 hours to form a precondensate []
was obtained (epoxy equivalent = 710). An epoxy emulsion was obtained in the same manner as in Example 1 using 100 parts of the precondensate, 18 parts of polyamide (amine value = 340) was added as an epoxy resin curing agent, and coating film performance was evaluated in the same manner as in Example 1. Examined. The results are shown in Table 2. Comparative Example 5 475 parts of bisphenol A diglycidyl ether (epoxy equivalent = 475) was mixed with 28 parts of orthophosphoric acid and 250 parts of methyl ethyl ketone, and the mixture was reacted at 70°C for 20 hours until the oxirane group content became 0 to form a precondensate. [] was obtained (acid value 40 mg, KOH/g). An emulsion was obtained in the same manner as in Example 1 using 100 parts of the precondensate.
5 parts of triethylenetriamine was added to each part, and the coating film performance was examined in the same manner as in Example 1. The results are shown in Table 2. Comparative Example 6 100 parts of bisphenol A diglycidyl ether (epoxy equivalent = 380) was mixed with 3 parts of 1-hydroxyethane-1,1-diphosphoric acid and reacted at 80°C for 5 hours to form a precondensate [XI] was obtained (epoxy equivalent = 502). An epoxy emulsion was obtained in the same manner as in Example 1 using 100 parts of precondensate [XI], 23 parts of polyamide (amine value = 340) was added as an epoxy resin curing agent, and coating film performance was evaluated in the same manner as in Example 1. I looked into it. The results are shown in Table 2. Comparative Example 7 100 parts of bisphenol A diglycidyl ether (epoxy equivalent = 380) and 20 parts of dibasic potassium phosphate
The two parts were mixed and reacted with stirring at 100°C for 5 hours to obtain a precondensate [XII]. An epoxy emulsion was obtained in the same manner as in Example 1 using 100 parts of precondensate [XII], 3 parts of polyamide (amine value = 340) was added as an epoxy resin curing agent, and a coating film was formed in the same manner as in Example 1. I created it, but 1
It did not harden even after being left at room temperature for a week.
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