JPS5849318B2 - Netsukokaseikokokaibungatatoriyouno tosouhouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a coating method for a thermosetting high solids coating composition that can be spray coated at a coating temperature of about 70°C or less, and a method for reducing the amount of solvent generated during or after coating the coating composition. The present invention relates to a method of coating a thermosetting high solids coating composition that prevents vapor from dissipating into the atmosphere.

In recent years, as air pollution has become more serious and global resource shortages have become more serious, the paint industry is also under pressure to take measures to address these problems.

Increasing the concentration of the paint (reducing the volatile solvent content) is an extremely effective means of simultaneously solving these two problems.

This is because by increasing the concentration of the paint, the amount of solvent volatilized into the atmosphere during the paint film formation process is significantly reduced, and at the same time, the amount of solvent that is not a component of the final formed paint film is significantly reduced. Dogs also contribute to resource conservation.

As a result of repeated research on methods for increasing the concentration of paint and preventing the release of solvent into the atmosphere, the present inventors applied a high solids content type paint composition as described in the above "claims" and further developed a coating film. By removing the solvent vapor generated during the formation process using a gas-liquid contact method, the amount of solvent used can be reduced by approximately half without impairing the performance of currently used thermosetting paints.
We have found a more economical treatment method that can reduce the amount of solvent by ~1/7 and prevent the solvent from dispersing into the atmosphere.

In other words, when spray painting conventionally used thermosetting paints, in order to achieve a viscosity of 100 to 50 centistokes suitable for spray painting, 150 parts by weight of solvent is added to 100 parts by weight of vehicle solid in the paint. In contrast, in the composition of the present invention, the amount of solvent used is 80 to 20 parts by weight, which is about 1 part or more compared to the conventional method.
It is possible to reduce it by /2 to 1/7.

Furthermore, by using a coating composition containing a specific solvent composition as in the present invention, there is an effect of extremely reducing the amount of solvent volatilized, particularly in the coating process to the coating film forming process.

This makes the gas-liquid contact process more economical and
In order to drastically reduce the amount of solvent in processes where the amount of exhaust air is large and it is difficult to treat volatile solvents by incineration, adsorption, absorption methods, etc., the effects of the present invention can be achieved by reducing the absolute amount of solvent. It's bigger.

Furthermore, since the composition of the present invention has good thermal stability, it is easy to apply hot spraying, which is known as an extremely effective means for applying paints at high concentrations.

One possible way to increase the concentration of paint is to lower the molecular weight of the resin component in the vehicle used.
By simply lowering the molecular weight alone, although it is possible to achieve high concentration of the paint, the curing properties are insufficient and it is not possible to obtain a paint that exhibits sufficient performance as a thermosetting paint. .

As a result of intensive research on increasing the concentration of paint, the present inventors found that the number average molecular weight of conventionally used acrylic resins is 10,000 to 50,000, but
By having a fairly low molecular weight of 0 to 6,000 and introducing about twice as many functional hydroxyl groups into the resin as compared to conventional ones, it is possible to obtain a resin with curability comparable to conventional ones. I found out.

That is, the present invention provides: (IXaXa) A compound represented by the general formula (Rl represents H or a C1-2 alkyl group, R2 represents H or CH3) 20 to 35% by weight (portion) Acrylic acid or methacrylic acid 4 Weight% or less←→ Alkyl ester of methacrylic acid having 1 to 4 carbon atoms, cyclohexyl ester of acrylic acid or methacrylic acid, styrene, α-methylstyrene, and 1 carbon number
20 to 55% by weight of one or more compounds selected from alkylated styrenes substituted with ~4 alkyl groups, and (d) alkyl esters of acrylic acid with 2 to 18 carbon atoms, methacrylic acid. A compound represented by the general formula of an alkyl ester having 5 to 18 carbon atoms, and 15 to 60% by weight of one or more selected from the compounds represented by the general formula are copolymerized in the presence of a polymerization initiator. an acrylic copolymer with a number average molecular weight of 1,500 to 6,000 obtained by
Weight % (b) Melamine resin whose main component is hexakisalkoxymethylmelamine, in which in the chemical formula below, an average of 2 to 6 R's are alkyl groups having 2 to 4 carbon atoms, and the rest are methyl groups 20 to 40 Weight% (c) One or more double bonds in one molecule and primary or secondary
Molecular weight 250 to 1 containing at least one hydroxyl group at the same time
000 compound and (d) bound formaldehyde per mole of melamine.
Nilfia), (b) and (c) in which not more than 0 to 1/2% by weight of a melamine resin modified with an alcohol having 1 to 4 carbon atoms is added to the component (b) in an amount of not more than 5 moles. (e) 0.05 to 1.00 parts by weight of an aliphatic or aromatic sulfonic acid or an amine salt thereof, and (f) per 100 parts by weight of a mixture formed by component (d) or a certain amount of the above (d).
A water-soluble solvent that simultaneously dissolves each of the above components and has a solubility in water at 20°C of 0.5% by weight or more and a vapor pressure of 90 miHg or less at 20°C, and the sum of the partial pressures of each solvent. Thermosetting high solids content comprising 80 to 20 parts by weight of a solvent having a solvent composition such that the temperature is 35 mmHg or less, or further containing 10% by weight or less of a water-insoluble solvent. A method for painting a thermosetting high-density mold coating composition by spraying it at a paint temperature of about 70°C or less, and (2) the above-mentioned thermosetting high solid content coating method. Spray coating the mold coating composition at a coating temperature of about 70°C or less, and/or recovering the vapor of the solvent that evaporated or volatilized after coating by a gas-liquid contact method to prevent the vapor from dissipating into the atmosphere. A method for coating a thermosetting high solids coating composition, characterized by:

Examples of the component (a) of the acrylic copolymer (a) in the present invention include 2-hydroxyethyl acrylate, 2-hydroxyethyl acrylate, and
-Hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 2-hydroxybutyl acrylate, 2-hydroxybutyl methacrylate and the like.

(/→ Ingredients include, for example, methacrylic acid methacrylic acid, methacrylate, methacrylate, methacrylic acid, methacrylic acid, methacrylic acid, methacrylic acid, methacrylic acid, methacrylic acid, methacrylic acid, methacrylic acid, methacrylic acid, methacrylic acid,
Esters such as i-butyl, t-7''yl, cyclohexyl, acrylic acid cyclohexyl ester, styrene, α
-Methylstyrene, butylstyrene, vinyltoluene, etc.

(d) Components include amyl, hexyl, 2-ethylhexyl, lauryl esters of acrylic acid or methacrylic acid, methyl, ethyl, i-probyl, n-probyl, n-butyl, i-butyl, t-butyl esters of acrylic acid, and Glycidyl acrylate, adducts of glycidyl methacrylate and fatty acids having 2 to 18 carbon atoms, adducts of methacrylic acid or acrylic acid and glycidyl esters having aliphatic chains having 2 to 18 carbon atoms, compounds of component (a) above. and half-esterified products of dicarboxylic anhydrides such as phthalic anhydride, hexahydrophthalic anhydride, tetrahydrophthalic anhydride, and succinic anhydride, and adducts with glycidyl esters containing an aliphatic side chain having 2 to 18 carbon atoms, etc. can be given.

Acrylic copolymers comprising such components can be produced by methods such as solution polymerization, cloud polymerization, and bulk polymerization in the same manner as conventional methods for producing acrylic resins, but solution polymerization is most advantageous.

Acrylic copolymers with a number average molecular weight of less than 1500 require the use of extremely large amounts of initiators or
The reaction must be carried out at extremely low concentrations, which is not practical from an economic standpoint.

On the other hand, if it is thicker than 6000, the viscosity is high and the object of the present invention cannot be achieved even if the monomer composition is capable of imparting appropriate hardness and flexibility to the coating film.

In addition, in order to maintain the hardness and flexibility of the cured coating film at a sufficiently practical level, the hard monomer component in the acrylic copolymer composition, the soft monomer component, (d) It is necessary to adjust the components within the above ranges.

That is, if the ← component is too large, the viscosity of the copolymer will be high, and the resulting coating film will be brittle and have poor flexibility.

If the amount of component (d) is too large, the resulting coating film will be too soft and the surface will remain sticky.

Melamine resin (component (b)), which is a curing agent, is a melamine resin modified with mixed alcohol, and hexakismethoxymethyl melamine is mixed with alcohol having 2 to 4 carbon atoms at 70°C or less in the presence of a strong acid. It can be easily synthesized by ether exchange.

This material has a significantly lower viscosity than ordinary melamine resins, and is preferred for increasing the concentration of paints.

On the other hand, the conventionally well-known hexakismethoxymethyl melamine has a large cohesive force when combined with the above-mentioned acrylic copolymer, and it is difficult to use because it tends to cause coating defects such as dents and dents on the coating surface.

However, it has been found that by substituting a part of the methoxy group with an alcohol having 2 to 4 carbon atoms, as in component (b), this drawback can be compensated for and the viscosity can still be lowered.

However, this melamine resin (component (b)) has low reactivity and requires a curing catalyst [component (e)] described below in the present invention, but when used in combination with conventional alkyd resins, The stability during heating is poor, and hot spraying, which is an effective means for spraying paint at high concentrations, cannot be applied. ] In order to improve the stability during heating and further improve the curability, a conventionally used melamine resin (component (d) above) was used within the scope of the present invention. even if 7
Can be hot sprayed at temperatures below 0°C.

Examples of reactive diluents that can be used as component (C) include glycidyl acrylate, glycidyl methacrylate, aliphatic or aromatic mono- or dicarboxylic acids and their anhydrides (for example, fatty acids having 12 to 18 carbon atoms, p
- methacrylic acid, acrylic acid, fumaric acid, maleic acid, itaconic acid or anhydrides thereof; Mono- or diepoxide compounds (e.g. Cardura E1 Epico-}82
8, 1 0 0 1 (both Shell Chemical Company Sh
phenyl glycidyl ether, diglycidyl phthalate, glycidyl isononaate, etc.), monoesterified products with glycol, or trivalent or higher polyhydric alcohols such as trimethylolpropane and glycerin. An adduct of a monoester of a compound represented by the general formula and an aliphatic or aromatic dicarboxylic acid or its anhydride with a mono- or diepoxide compound, or an adduct of a mono- or diepoxide compound, or monoesters with alcohols, mono- or diesters with trihydric or higher polyhydric alcohols such as trimethylolfuropane, glycol monoallyl ethers, mono- or diallyl ethers of polyoxymethylene glycol, esters of acrylic acid or methacrylic acid, Or, if it is a compound with a molecular weight of 250 to 1000 that simultaneously contains one or more primary or secondary hydroxyl groups and one or more double bonds in one molecule, Seishu C
), for example, a product obtained by reacting 1 mol or more of acrylic acid (or methacrylic acid) and 1 mol or less of saturated aliphatic or aromatic monocarboxylic acid per 1 mol of diepoxide compound (same as above) can also be used. can.

These reduce the viscosity of the paint without reducing the non-volatile content.

The melamine resin that is component (d) used in the present invention includes most of the melamine resins that have been used conventionally, and although it is not always necessary, it is effective especially when it is desired to lower the baking temperature. This means that the above-mentioned effects will not be impaired as long as the amount used is within the scope of the present invention.

As the curing catalyst (component (e) above), sulfonic acids include alkyl sulfonic acids having 2 to 18 carbon atoms, 1 to 18 carbon atoms;
Although 18 alkylbenzenesulfonic acids, benzenesulfonic acids, and organic amine salts thereof can be used, sulfonic acids, which are strong acids, are particularly effective.

The amount of component (e) to be used is as follows: 1. 0 0
A suitable amount is 0.05 to 1.00 parts by weight.

In other words, if the amount is less than 0.05 part, the curability is poor;
．． If the amount exceeds 0.00 parts, the heating stability will deteriorate.
It is difficult to apply k-play.

The solvent (f) mainly consists of a water-soluble solvent, which is used during and (b) after the application by the gas-liquid contact method to prevent evaporation or dissipation of solvent vapor into the atmosphere. It seems economically possible.

In this specification, water-soluble solvents are those having a solubility in water of 0.5% by weight or more at 20°C, and water-insoluble solvents are those having a solubility in water of 0.5% by weight at 20°C.
Refers to something smaller than % by weight.

The solubility of the solvent used in water at 20°C is 0.
less than 5% by weight, and the vapor pressure at 20°C is 90
If it is larger than miHg, the solubility of the solvent in water is low and the vapor pressure is high, so the efficiency of absorption into liquid by the gas-liquid contact method is extremely poor and it is not suitable for effective recovery.

Furthermore, if the solubility is greater than 0.5% by weight and the vapor pressure is greater than 90 yunHg, the efficiency of absorption of the solvent into the liquid will be poor because the exhaust air volume of the coating booth during spray painting will be extremely large. , which is also not suitable.

Furthermore, the solubility is less than 0.5% by weight and the vapor pressure is 9.
If it is less than 0 mm Hg, the solubility of the solvent in water is low, and therefore the absorption efficiency is poor and it is not suitable.

Therefore, suitable solvents for use in the present invention have a solubility in water of 0.5% by weight or more at 20°C and a vapor pressure of 90 mmHg or less at 20°C.

In the present invention, examples of solvents that are water-soluble and have a vapor pressure of 90 mmHg or less at 20°C include ethanol, n-propyl alcohol, isopropyl alcohol, and n-7''
Chyl alcohol, isobutyl alcohol, secondary nibutanol, tertiary butanol, n-amyl alcohol, isoamyl alcohol, secondary amyl alcohol, tertiary amyl alcohol, cyclohexanol, ethylene glycol, phlopylene glycol,
Alcohol solvents such as ethylene glycol, ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, methyl butyl ketone, ethyl butyl ketone, cyclohexanone, isophorone, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether,
Ethylene glycol dimethyl ether, ethylene glycol ethyl ether, ethylene glycol mo/7”F
- glycol ether solvents such as diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, ether solvents such as dioxane, dimethyl dioxane, ethyl acetate, butyl acetate, isopropyl acetate, isobutyl acetate, secondary butyl acetate Ester solvents such as ethylene glycol monomethyl acetate, ethylene glycol monoethyl acetate, and ethylene monobutyl acetate are suitable.

In order to use the above-mentioned solvents in accordance with the gist of the present invention, a combination in which the sum of the partial pressures of each solvent is 357 nπHg or less is appropriate.

If the sum of the partial pressures is higher than 35 mmHg, the absorption efficiency of the liquid in the gas-liquid contact method using a liquid mainly composed of water will be significantly poor because the amount of air discharged from the painting booth during spray painting is usually extremely low. Become.

Furthermore, if water-insoluble solvents such as triol, xylol, petroleum-based high-boiling aromatics, etc. are contained in an amount exceeding 10% by weight, the absorption efficiency of water-based liquid materials will be significantly reduced. It's going off topic.

In the coating composition of the present invention, like conventional coatings,
It can also be used as a clear paint or colored with appropriate dyes and pigments.

Additionally, additives such as flowability modifiers and color separation inhibitors can be used in the same manner as in conventional paints.

Gas-liquid contact methods that can be used in the present invention include scrubber method,
Suitable methods include a spray tower method, a rotating disc method, a multistage tower method, and a bubble stirring method.

In either case, water or water combined with an appropriate drug can be used as the liquid material.

Using water as a liquid material is inexpensive and advantageous in terms of post-treatment.

After the solvent vapor has been absorbed by the gas-liquid contact method, the water may be post-treated in a conventional manner and disposed of as waste water.

According to the present invention, since the amount of solvent used is small, it is useful for resource saving, and the amount of solvent volatilized is also significantly smaller than that of the conventional method, so it is extremely effective from the point of view of preventing air pollution.

Furthermore, since a specific solvent composition is used in the present invention, the solvent vapor generated during blow-painting or during the process of forming a film can be recovered very easily by the gas-liquid contact method, thus greatly polluting the air. There are almost no such things.

Next, the acrylic copolymer ((a)
Production examples and Examples of component) and melamine resin (component (b)) are shown below.

The following parts and % represent parts by weight and % by weight.

Preparation of Acrylic Copolymer A 1000 parts of ethylene glycol monoethyl ether acetate was charged into a reaction vessel equipped with a thermometer, a stirrer, and a backflow condenser dropping device, and heated to its reflux temperature.

While maintaining the reflux state, from a dropping device, 250 parts of 2-hydroxyethyl methacrylate, 20 parts of acrylic acid, 500 parts of n-butyl methacrylate, 130 parts of i-butyl acrylate, 100 parts of lauryl methacrylate, and 50 parts of azobisisovaleronitrile were added. , 10 parts of t-dodecylmercabutane were added dropwise over a period of 3 hours.

One hour after the completion of the dropwise addition, a solution of 10 parts of azobisisohaleronitrile dissolved in 100 parts of ethylene glycol monoethyl ether acetate (additional catalyst) was added dropwise over a period of 3 hours, and the temperature was maintained at the same temperature for 1 hour.

Next, the solvent was distilled off under reduced pressure at 150°C or less, and concentrated to 8
A copolymer solution with a solid content of 0% was obtained.

The number average molecular weight of this copolymer was 3,000.

Production of acrylic copolymers B to D Using a reaction vessel similar to that used for producing copolymer A,
Acrylic copolymer BD having the composition shown in Table 1 was obtained by similar reaction operations.

(The numbers in Table 100 indicate the number of parts blended.) Table 2 shows the reaction conditions according to the above composition, and the solid content % and number average molecular weight of the obtained acrylic copolymer.

Production of Melamine Resin A Cymel #300 (American Cyanamid Co.
), 390 parts (1 mol) of hexakismethoxymethylmelamine (purity 9597% or less), 184 parts (4 mol) of ethanol, and 2.8 parts of 60% nitric acid.

The temperature of the reaction system is gradually increased to 60° C., and at the same time the pressure inside the system is reduced to 50 to 60 icHg.

Methanol by-produced during the reaction must be removed from the system.
'C for 5 hours.

After the reaction was completed, the solution was neutralized to pH 8.2 with a 30% caustic soda aqueous solution, and the neutralized solution was heated to its boiling point, and unreacted ethanol was removed under reduced pressure.

The concentrate is filtered to remove neutralized salts.

The obtained product (solid content 99.7%) had a Gardner-Holtz foam viscosity of 0/25°C, and its chemical structure was determined by gas chromatography analysis of a phosphoric acid decomposition product to contain 2.3 ethoxy groups per melamine nucleus. Moreover, it was recognized as methyl and ethyl mixed alkyl etherified methylol melamine containing no free methylol group.

Production of melamine resin B Cymel #3 was placed in a reaction vessel similar to the production method of melamine resin A.
00 390 parts (1 mol), n-butanol 518 parts (
7 mol), 4.2 parts of 60% nitric acid was prepared in the same manner, solid content 99.2% Gardner-Holtz foam viscosity L/25°C, containing 4.1 butoxy groups per melamine nucleus and free methylol. A mixed methyl and n-butyl alkyl etherified methylolmelamine containing almost no groups was obtained.

Production of Melamine Resin C 126 parts (1.00 mol) of melamine and 450 parts of n-butanol formalin (containing 40% formaldehyde) (6 parts as formaldehyde) were placed in a reaction vessel equipped with a stirrer, a thermometer, a water separator, and a backflow condenser. mol) and heated under reflux for 1.5 hours (during which time the pH was maintained at 7.8 to 7.5 with caustic soda, then 500 parts of n-butanol was added and the pH was adjusted to 7.5 with phthalic anhydride.
After 3 hours of dehydration through a water separator, the butanol-water-formaldehyde mixture was distilled off until the temperature of the contents rose to 117°C.

In addition, a mixture of butanol/xylene has a solid content of 60%.
Adjusted to be %.

The resulting product had a Gardner-Holtz foam viscosity of K/25° C. and had a bound formaldehyde content of 51 mol per melamine nucleus.

Melamine resins A and B are component (b) and C is component (d).
It can be used as

Examples 1 to 3, Comparative Example (1) Paint composition and coating film properties: 0. A panel prepared by coating an epoxy primer on a mild steel plate having a thickness of 8 ynvt was spray-coated with a paint having the composition shown in Table 3, and then heated and cured at 160° C. for 20 minutes.

Values within 0 indicate solid content ratio.

The measured solids content indicates the proportion of the residue after heating the sample at 150° C. for 60 minutes, and the blended solids content is theoretically calculated based on the sample blend.

Symbol explanation in the component (c) column A Same as monomer A (molecular weight 322) B Fumaric acid adduct of Cardura E (2/1 molar ratio)
(Molecular weight 615) C Diallyl ether of polyoxymethylene glycol (Molecular weight 640) D Acrylic acid adduct of diglycidyl phthalate (1/
2 molar ratio) (molecular weight 541) The comparative example has an excess of hydroxyl groups and is poor in thermal stability.

In addition, although the 4-curing properties were the same as in Examples, the flexibility of the coating film was poor.

Gel fraction The paint obtained in the Example was applied onto a 2-inch thick glass plate using a 4 ml doctor blade and baked at a predetermined temperature for 30 minutes.

The cured coating film thus obtained was peeled off, and approximately 0.52 was placed in a #5A cylindrical paper, socked with acetone as an extraction solvent, extracted in an extractor for 10 hours, and then heated to a constant weight at 60°C in a vacuum dryer. until dry.

The weight of the cured coating film before and after extraction was measured, and the weight was included in the following formula to calculate the solvent-insoluble content (%).

O. Erichsen test: This was conducted according to JIS Z-2247, and the thicker the test result value, the better the flexibility.

○ Gloss value: JIS K-5400, 6.70 Gasoline resistance: After immersing in Nisseki silver gasoline at 20°C for 24 hours,
The degree of swelling and elution of the coating film in the immersed area of the pulled-up coated plate was evaluated.

(2) As a result of recovering the solvent vapor emitted during painting by a gas-liquid contact method, the paints obtained in Examples 1 to 3 and comparative examples are spray-painted, and the solvent vapor released at that time is collected by a gas-liquid contact method. The recovery effect was investigated using a scrubber method using only water as the liquid material, as follows.

(b) The paints of Examples 1 to 3 and Comparative Examples were heated (50°C) so that the solvents could easily evaporate, and the exhaust gas from the soufflé coating was introduced into the air outlet of the absorption tower of the gas-liquid contact device. Spray paint.

Adjust the concentration of solvent vapor released during spraying in the air to 100 ppm at the air outlet.

(Total air volume] 70 rrj/miyr). (Port) 21 ml of clean water is put into the absorption tower and circulated, and the amount of circulating water is 700 m/min.
Adjust with a flow meter so that the amount is 1 kg.

In accordance with JIS-K-0095 (waste gas sampling method; absorption liquid: water),
Sample the wastewater from each wastewater outlet with a glass pin (100 r/ll).

The concentration of the solvent in the sampled air and wastewater was determined using a gas chromatograph.

As a result, as shown in Table 5, the relationship between the concentration of the waste air outlet, time, and the concentration of waste water for 100 ppm of the air outlet is shown in Table 5. 20ppm (80% absorption rate)
It took 67.8 minutes to reach this point.

The wastewater concentrations at that time were 1570 ppm and 306 ppm, respectively.
It was 0 ppm.

Similarly, the results of Examples 2 to 3 and Comparative Example are shown in Table 5.

The comparative example showed almost no absorption effect.

Claims (1)

[Scope of Claims] 1 (aj(a) 20 to 35% by weight of a compound represented by the general formula (a) 4% by weight or less of acrylic acid or methacrylic acid←→
C1-4 alkyl ester of methacrylic acid,
Cyclohexyl ester of acrylic acid or methacrylic acid, styrene, α-methylstyrene and carbon number 1-4
20 to 55% by weight of one or more compounds selected from alkylated styrenes substituted with an alkyl group and (d) an alkyl ester of acrylic acid with 2 to 18 carbon atoms, and a carbon number of methacrylic acid. Acrylic having a number average molecular weight of 1,500 to 6,000 obtained by copolymerizing 15 to 60% by weight of one or more compounds selected from the general formula of 5 to 18 alkyl esters in the presence of a polymerization initiator. System copolymer 65-20
Weight % (b) 20 to 40 weight % of a melamine resin whose main component is hexakisalkoxymethylmelamine, in which an average of 2 to 6 of R in the following chemical formula is an alkyl group having 2 to 4 carbon atoms, and the remainder is a methyl group. , (c) 15 to 60% by weight of a compound with a molecular weight of 250 to 1000 that simultaneously contains one or more double bonds and one or more primary or secondary hydroxyl groups in one molecule, and (d) bound formaldehyde. 55 per mole of melamine
Components (Nida), (b) and (c), in which a melamine resin modified with an alcohol having 1 to 4 molar carbon atoms is added in an amount of 0 to 1/2% by weight or less based on the component (b); Furthermore, per 100 parts by weight of the mixture formed by blending the above d) component, (e) 0.05 to 1.00 parts by weight of an aliphatic or aromatic sulfonic acid or its amine salt, and (f) each of the above components. Consists of a water-soluble solvent that dissolves at the same time and has a solubility in water at 20℃ of 0.5% by weight or more and a vapor pressure of 90mmHg or less at 20℃, and the sum of the partial pressures of each solvent is 35mmHg or less. A thermosetting high solids content type coating composition consisting of a solvent composition such as A method for applying a thermosetting high solids coating composition, which comprises spraying the composition at a temperature of about 70°C or less. 2 (aXi) 20 to 35% by weight of the compound represented by the general formula. 20 to 55% by weight of one or more compounds selected from cyclohexyl ester, styrene, α-methylstyrene, and alkylated styrene substituted with an alkyl group having 1 to 4 carbon atoms and (di)acrylic acid. One or more selected from alkyl esters having 2 to 18 carbon atoms, anolequinoleesters having 5 to 18 carbon atoms of methacrylic acid represented by the general formula, and compounds represented by the general formula 15 Acrylic copolymer 65-20 with a number average molecular weight of 1500-6000 obtained by copolymerizing ~60% by weight in the presence of a polymerization initiator
Weight % (b) 20 to 40 weight % of a melamine resin whose main component is hexakisalkoxymethylmelamine, in which an average of 2 to 6 of R in the following chemical formula is an alkyl group having 2 to 4 carbon atoms, and the remainder is a methyl group. , (c) 15 to 60% by weight of a compound with a molecular weight of 250 to 1000 that simultaneously contains one or more double bonds and one or more primary or secondary hydroxyl groups in one molecule, and (d) bound formaldehyde. Melamine resin modified with an alcohol having 1 to 4 carbon atoms in an amount of 55 mol or less per 1 mol of melamine is 0 to 1/2 of the above component (b).
(e) aliphatic or aromatic sulfonic acid or 0.05 to 1.00 parts by weight of the amine salt, and (f) each of the above components is dissolved at the same time, and the solubility in water at 20°C is 0.5% by weight or more and the vapor pressure at 20°C is 90 mmHg or less. 80 to 20% by weight of a water-soluble solvent comprising a solvent composition such that the sum of the partial pressures of each solvent is 35 imHg or less, or further containing 10% by weight or less of a water-insoluble solvent in the solvent composition. A thermosetting high solidity separating paint composition comprising: 1. A method for coating a thermosetting high-solids paint composition, which comprises recovering the vapor by a vapor and preventing the vapor from dissipating into the atmosphere.