JPH04234464A - Base coat composition for automobile paint and method for forming the composition - Google Patents

Abstract

PURPOSE: To provide an aq. metallic base coat compsn. showing excellent appearance and a method for stabilizing an aluminium piece for a long time to introduce the same into aq. coating.

CONSTITUTION: A base coat compsn. of coating for a car is characterized by a compsn. consisting of an aluminum base, a neutralizing base, a transparent resin base, a pigment base and a surfactant base and the above-mentioned aluminum base consists, for example, of a water reducible solvent soluble acrylic resin having a salt value of 15-65 based on a solid and containing 50-70 wt.% solid substance, 4-30 wt.% of metallic pigment, 25-55 wt.% solid substance in total, 35-50 wt.% water mixable org. solvent in total and 5-35 wt.% binder in total. The pigment vehicle is based on acrylic latex having excellent drying properties, coating film characteristics and coating film properties.

COPYRIGHT: (C)1992,JPO

Description

[Detailed description of the invention]

0001

FIELD OF THE INVENTION This invention relates to water-borne coating compositions for painting transportation vehicles. More specifically, the present invention is a multi-coat base coat comprising a primer and a transparent clear coat,
It relates in particular to coating compositions for basecoats containing metallic pigments and based on acrylic latex polymers.

0002

BACKGROUND OF THE INVENTION In the painting of automobiles, a series of paints are generally applied to a substrate. The first coat is a primer, on top of which a base coat is applied and finally a clear coat is applied. The base coat provides good decorative properties to the final finish with organic and inorganic pigments. Metallic finishes are desired for many automotive finishes. To obtain such a metallic effect, a metallic pigment, typically aluminum flakes, is present in the base coat.

In the current market, automotive paints, particularly base coats, contain high levels of organic solvents. Increasing concern about volatile organic substances released into the atmosphere has led to extensive efforts in the research and development of paints containing primarily water as a solvent and low levels of organic solvents. An example of such an effort is U.S. Pat.
No. 30,020, which describes a water-dilutable coating composition containing specifically selected acrylic copolymers, a solvent mixture, a pigment for coloring or optical effect, and a polymer dispersion. is listed. The acrylic copolymer and solvent mixture must be properly combined to obtain the desired optical effect of the metallic piece. The aqueous thermosetting acrylic resin described in US Pat. No. 3,862,071 controls the orientation of metallic pigments by adding a water-insoluble copolymer. British patent number 2
Proper metallic flake orientation is also achieved by microgel technology, such as that described in US Pat. Furthermore, a method for controlling the direction of metallic pigments using a polyurethane dispersion is disclosed in German Patent No. 3,210.
It is described in No. 051. Also, German patent No. 3 and 2
Cellulose esters have also been used in the past to control the fixation of metal pieces, as described in US Pat.

Fixation of the metal flakes in the base coat is generally achieved by rheology modifiers such as inorganic and organic thickeners. All conventional rheology modifiers or rheology control agents for water-based coatings have insufficient storage stability, insufficient weather resistance and are cumbersome to use. The specific rheology control agent used in the present invention provides a high quality finish with no mottling, high head-on brightness, and excellent flop in the case of silver metallic base coats.
Furthermore, the various problems described above do not occur.

Coating compositions used in the automotive market, particularly the automotive after-sales market, are generally formed by mixing various bases to achieve the desired color. These coating compositions are then used within about 1 to 5 days after formation. One major problem is the introduction of aluminum pieces that react with water to generate hydrogen gas. Therefore, aluminum flakes must be separated from other aqueous components to minimize such problems. The invention also relates to a method of storing aluminum flakes in an organic medium and introducing the aluminum flakes into an aqueous environment immediately before the paint is used.

The present invention relates to aqueous compositions for use in metallic and nonmetallic basecoats in multicoat systems for the automotive market. More particularly, the present invention relates to acrylic latex paint compositions used in base coat compositions for automotive paints.

The present invention also relates to basecoats containing pigments, metallic pigments, organic solvents, and conventional paint additives. The superior flake control of the coating compositions of the present invention is due to the rheology control agent and film shrinkage of the latex vehicle during drying. Using acrylic latex allows for very fast drying times. The coating composition of the present invention provides a basecoat that meets current and proposed volatile organic compound regulations. Even with conventional non-metallic pigments, the coatings of the present invention exhibit an excellent appearance.

The present invention also relates to a method for preserving aluminum flakes in an organic medium such that the aluminum flakes are introduced into an aqueous environment just before the paint is applied. This method reduces the risk that the aluminum pieces will react with water and generate hydrogen gas during storage. This method may also be used to preserve other water sensitive pigments such as copper and brass. Additionally, other pigments such as plastic films, mica, coated metallic foils may also be preserved using this method.

The automotive base coat paint of the present invention has five components: A (aluminum base) and B (neutralized base).
, C (clear resin base), D (pigment base), and E (surfactant base). Component A, the aluminum base, is solvent soluble.
) consists of metallic flakes suspended in a resin and a water-miscible solvent. The resin used in this component may be a water-reducible acrylic resin, a water-reducible polyester resin, or a water-reducible alkyd resin. Metallic pigments commonly used alone or in mixtures are copper, copper alloys, aluminum, steel, mica, plastic films, coated metallic foils, the amount of aluminum being 10-30 wt%, especially 20-30 wt%. It is preferable. Aluminum base is 5-40wt%
, preferably 20 to 30 wt% of a water-reducible solvent-soluble resin. This base organic solvent must be miscible with water. Examples of solvents are methanol, ethanol, propanol, butanol, N-methylpyrrolidone, glycol, glycol ester, glycol acetate, diethylene glycol ether, diethylene glycol acetate, propylene glycol ester, propylene glycol acetate, dipropylene glycol, dipropylene glycol acetate. Particularly preferred solvents are ethylene glycol propyl ether, ethylene glycol butyl ether, ethylene glycol hexyl ether, propylene methyl ether, propylene ethyl ether, propylene propyl ether, propylene butyl ether, propylene hexyl ether, dipropylene methyl ether, dipropylene ethyl ether, and dipropylene. Propyl ether and dipropylene butyl ether.

Component B, the neutralized base, is a water-reducible solvent-soluble resin neutralized with an amine, preferably ammonia, and dispersed in water to a concentration of 10-25 wt%, preferably 10-20 wt%. It's getting better. Excess amine, preferably ammonia, is added at a level of 1-10 wt%, preferably 5-10 wt%.

Component C, ie, the clear resin base, has a content of 10 to
50 wt%, preferably 25-35 wt% of acrylic latex polymer and 0-15 wt%, preferably 5-1
2wt% water-miscible solvent and 0.5-5.0wt
%, preferably 1.5 to 2.5 wt% of hydrophilic silica. Hydrophilic silica may be dispersed into the acrylic latex polymer by conventional dispersion techniques.

Component D, ie, pigment base, is 5 to 50 wt%
, preferably at a level of 15-30 wt% acrylic latex milled polymer. This content depends on the pigments in this component. The level of pigment in component D is 0.
5-35 wt%, this level also depends on the nature of the pigment. Typically about 10/100 to 300/100
A weight ratio of pigment to binder of is acceptable. Pigments are typically milled using conventional dispersion equipment such as sand mills, pearl mills, ball mills, horizontal mills, and vertical mills. Optional wetting agents, surfactants, and dispersing aids may be used.

Component E, ie, surfactant base, is 0.1 to
The water contains a polymeric fluorocarbon surfactant at a concentration of 4.0 wt%, preferably 2.0-3.0 wt%.

The present invention relates to coating compositions for water-containing basecoats designed specifically for the automotive market. The invention also relates to a method of incorporating metallic flakes into water-based paints to form superior basecoats. Proper fixation of the metal strips is achieved by using a novel rheology control agent that uses hydrophilic silica and a polymeric non-ionic fluorinated hydrocarbon. This new rheology control agent has been disclosed in Japanese Patent Application No. 2003-2001 filed by the same applicant as the present applicant.
It is stated in the specification of the No. The base coat is broken down into five base coats that are combined immediately before applying the base coat.

The present invention also relates to a method for preserving aluminum flakes in an organic medium such that the aluminum flakes are introduced into the aqueous medium immediately before the coating is applied. This method reduces the risk that the aluminum pieces will react with water and generate hydrogen gas during storage.

Moisture A, aluminum base, is an aluminum slurry dispersed in an organic environment containing a low to medium acid number acrylic, polyester, or alkyd resin. The acid number of these polymers on a solids basis should be about 15-65. A preferred polymer is a water-reducible, solvent-soluble acrylic resin modified with a glycidyl ester. Acrylic polymers are formed by conventional solution polymerization methods. Acrylic polymer is 3~5w
t% ethylenically unsaturated carboxylic acid such as methacrylic acid or acrylic acid, 15-30 wt% methyl methacrylate, 5-20 wt% 2-ethylhedroxy methacrylate, and 1-10 wt% isobornyl. methacrylate and optionally 5-20 wt% glycidyl esters of tertiary C10 fatty acids. Acrylic polymers include methyl ethyl ketone, acetone, ethanol,
Miscible with water such as methanol, propanol, butanol, N-methylpyrrolidone, glycol, glycol ether, glycol acetate, diethylene glycol ether, diethylene glycol acetate, propylene glycol ether, propylene glycol acetate, dipropylene glycol ether, dipropylene glycol acetate Formed in organic solvent. Particularly preferred solvents are ethylene glycol propyl ether,
Ethylene glycol butyl ether, ethylene glycol hexyl ether, propylene methyl ether, propylene ethyl ether, propylene propyl ether,
These are propylene butyl ether, propylene hexyl ether, dipropylene methyl ether, dipropylene ethyl ether, dipropylene propyl ether, methyl ethyl ketone, and dipropylene butyl ether. Surfactants may also be present during the polymerization at levels of 0.1-2.0 wt%. The final viscosity of the polymer is 16,000
~18000 cp, solid component content 50-75
wt%, preferably 55 to 65 wt%. The acid number of the polymer, on a solid basis, should be between 10 and 70, preferably between 15 and 65.

Any commercially available aluminum paste that can be used in oil-based or water-based paints may be used to form component A. The amount of aluminum pieces in this component is 4 to 30 wt%
, preferably 23-30.

Other non-metallic and metallic pigments that may be incorporated into the base include, but are not limited to, copper, copper alloys, mica, coated metallic foils, plastic flakes, and steel.

Additional organic solvents are required to reduce the viscosity of the acrylic resin. Acceptable solvents include methyl ethyl ketone, acetone, ethanol, methanol, propanol, butanol, N-methylpyrrolidone, glycol, glycol ether, glycol acetate,
It must be miscible with water, such as diethylene glycol ether, diethylene glycol acetate, propylene glycol ether, propylene glycol acetate, dipropylene glycol ether, dipropylene glycol acetate. Particularly preferred solvents are ethylene glycol propyl ether, ethylene glycol butyl ether, ethylene glycol hexyl ether, propylene methyl ether, propylene ethyl ether,
These are propylene propyl ether, propylene butyl ether, propylene hexyl ether, dipropylene methyl ether, dipropylene ethyl ether, dipropylene propyl ether, and dipropylene butyl ether. Component A is a total of 25-50 wt% solid materials, 5-3
It contains 5 wt% binder and 35 to 50 wt% organic solvent. Additional wetting agents and anti-settling substances common in the paint industry may be added.

Component A, the formation of the aluminum base, is important for the proper appearance of the aluminum flakes in the final coating. The appropriate amount of acrylic resin solution is methyl ethyl ketone, acetone, ethanol, methanol,
Miscible with water in appropriate amounts such as propanol, butanol, N-methylpyrrolidone, glycol, glycol ether, glycol acetate, diethylene glycol ether, diethylene glycol acetate, propylene glycol ether, propylene glycol acetate, dipropylene glycol ether, dipropylene glycol acetate. Dissolved in possible organic solvents. Particularly preferred solvents are ethylene glycol propyl ether, ethylene glycol butyl ether, ethylene glycol hexyl ether, propylene methyl ether, propylene ethyl ether, propylene propyl ether, propylene butyl ether, propylene hexyl ether,
These are dipropylene methyl ether, dipropylene ethyl ether, dipropylene propyl ether, and dipropylene butyl ether. A suitable amount of aluminum paste is suspended in the above resin solution. The aluminum slurry is stirred until the base is smooth and uniform.

Component B, the neutralizing base, is an aqueous solution containing dispersed acrylic resin and ammonia. The above-mentioned acrylic resin is used for this component. Other water-reducible resins such as polyester resins and alkyd resins may also be used. 0.1-15.0wt%, preferably 0
．． An aqueous solution containing 1 to 8.0 wt% ammonia is preferred. Appropriate amount, usually 5 to 25 wt%, preferably 1
0-20 wt% acrylic resin is added to the basic aqueous solution and stirred. The resulting solution should be clear to slightly cloudy and have a pH of 7.5 to 10.0, preferably 8.0 to 10.0. Also, the obtained solution is 5 to 25 wt%, preferably 10
It must have a non-volatile content of ~20 wt%.

Component C of the coating composition of the present invention, ie, the clear resin base, contains acrylic latex. Typical properties of this acrylic latex are shown in Table 1.

[0023]

[Table 1] Solid substance content (wt%)
20-60 pH

7-10 Weight per gallon (lbs) 8.0-9.0
(g/cm3)
(0.96-1.1) Minimum coating film formation temperature (℃) 0-7
0 Sward hardness
25-110
mechanical stability
No problem Glass transition temperature (℃)
10-50
average molecular weight
150000~300000
number average molecular weight
30000~60000 Acid value in solid state 5~
35 Volatile organic solvent content (wt%)
0-20 Particle size (nm
) 50-1
50

Particularly preferred acrylic latex is
Neocr sold by ICI Resins
yl A-622, Neocryl A-640,
NeocrylA-6037, Johnson Wa
Joncryl J-537 sold by x, Jo
ncryl J-538, NL Industry
Arolon 860-W- sold by es
It is 45. The amount of acrylic latex in this ingredient is 1
It is 5 to 45 wt%, preferably 25 to 35 wt%. The amount of organic solvent in this component is from 5.0 to 30 wt%, preferably from 5 to 15 wt%, and the solvent must be miscible with water. Examples of water-miscible solvents are methyl ethyl ketone, acetone, ethanol, methanol, propanol, butanol, N-methylpyrrolidone,
These are glycol, glycol ether, glycol acetate, diethylene glycol ether, diethylene glycol acetate, propylene glycol ether, propylene glycol acetate, dipropylene glycol ether, and dipropylene glycol acetate. Particularly preferred solvents are ethylene glycol propyl ether, ethylene glycol butyl ether, ethylene glycol hexyl ether, propylene methyl ether, propylene ethyl ether, propylene propyl ether, propylene butyl ether, propylene hexyl ether, dipropylene methyl ether, dipropylene ethyl ether, dipropylene propyl ether, dipropylene butyl ether. This ingredient also contains other conventional paint additives such as thickeners, extenders, plasticizers, stabilizers, light stabilizers, wetting agents, waxes, anti-foaming agents, defoamers, and catalysts at conventional levels. may be contained alone or in combination.

[0025] Also, this component contains 1.0 to 8.0 wt%
Hydrophilic colloidal silica is present, preferably at a level of 2.0-3.0 wt%. The particle size of hydrophilic colloidal silica is about 1.0 to 10000 mμ,
The surface area is approximately 50-1200 m2/g. Silica is silicon dioxide with a purity of approximately 99.8 wt%.
It exists in the form of a three-dimensional branched chain assembly and has a hydrophilic surface capable of hydrogen bonding. The silica is dispersed into the above resin solution using conventional methods such as ball milling, pebble milling, horizontal milling, vertical milling, pearl milling. The total non-volatile content of this component is 20-50wt
%, preferably 25 to 35 wt%.

Component D, the pigment base, provides a color effect to the coating composition. The resin used for pigment dispersion is acrylic latex. Typical properties of this acrylic latex are shown in Table 2.

[0027]

[Table 2] Solid substance content (wt%)
20-60 pH

7-10 Weight per gallon (lbs) 8.0-9.0
(g/cm3)
(0.96-1.1) Minimum coating film formation temperature (℃) 0-70
Sward hardness
25-110 Mechanical stability
No problem Glass transition temperature (℃)
10-50
average molecular weight
150000~300000
number average molecular weight
30000-60000 Acid value in solid state 5-35
Volatile organic solvent content (wt%)
0-20 Particle size (nm)
50-150

A particularly preferred acrylic latex is IC
Neocryl sold by I Resins
A-622, Neocryl A-640, Ne
ocrylA-6037, JoncrylJ-537 sold by Johnson Wax, Jonc
ryl J-538, NL Industries
Arolon 860-W-45 sold by
It is. The amount of this resin in component D is 15-60 wt%,
Preferably it is 20 to 40 wt%. Organic and inorganic pigments or dyes are milled in this resin using standard techniques. Examples of dispersion equipment are ball mills, pebble mills, pearl mills, horizontal mills, vertical mills. Examples of pigments and dyes are titanium dioxide, graphite, carbon black, zinc oxide, cadmium sulfide, chromium oxide, zinc sulfide, zinc chromate, strontium chromate, barium chromate, lead chromate, lead cyanide, lead silico chromate. , chromium oxide,
These include, but are not limited to, zinc sulfide, yellow nickel titanium, yellow chrome titanium, red iron oxide, transparent red oxide, transparent yellow oxide, black iron oxide, ultramarine blue, phthalocyanine complex salts, amaranth, kirnacridone, and halogenated thioindigo pigments. It's not something you can do. Component D
The amount of pigment or dye therein ranges from 0.1 to 35.0 wt%, typically from 5 to 25 wt%. This component is also a dispersion aid,
Antisettling agents, wetting agents, thickeners, extenders, plasticizers, stabilizers, light stabilizers, waxes, antifoaming agents, antifoaming agents,
Other conventional paint additives such as catalysts may be included in conventional amounts alone or in combination. Also included in this component are methyl ethyl ketone, acetone, ethanol, methanol, propanol, butanol, N-methylpyrrolidone, glycol, glycol ether, glycol acetate, diethylene glycol ether,
Water-miscible solvents such as diethylene glycol acetate, propylene glycol ether, propylene glycol acetate, dipropylene glycol ether, dipropylene glycol acetate are present. Particularly preferred solvents are 0 to 25 wt%, preferably 0 to 12 wt%.
t% of ethylene glycol propyl ether, ethylene glycol butyl ether, ethylene glycol hexyl ether, propylene methyl ether, propylene ethyl ether, propylene propyl ether, propylene butyl ether, propylene hexyl ether,
These are dipropylene methyl ether, dipropylene ethyl ether, dipropylene propyl ether, and dipropylene butyl ether.

Component E, ie surfactant base, is 0.1-
The water contains a polymeric nonionic fluorinated hydrocarbon surfactant at a level of 5 wt%, preferably 2.0-3.0 wt%. The polymeric nonionic fluorinated hydrocarbon surfactant contains an ethylene oxide linkage and has a
It has a weight average molecular weight of 0.000 and contains 2 to 25 wt% fluorine based on the weight of the surfactant. One preferred nonionic fluorinated hydrocarbon polymer is about 30-70w
t% ethylene oxide linkage, 10-20wt%
fluorine content and a weight average molecular weight of about 10,000 to 30,000.

The final coating composition is formed by mixing components A through E in the order and amounts to produce the desired color and metallic effect. Typically the final paint has a solids content of 5-30 wt% and an organic content of 5-1
It is 5wt%. The rheology of a paint is determined by the amount of colloidal silica and polymeric nonionic fluorocarbon surfactant present in the paint. The amount of colloidal silica is 0.5 to 5.0 wt% based on the weight of water used in the final basecoat composition, and the amount of polymeric nonionic fluorocarbon surfactant is 0.05 to 1. It is 0wt%. The water content is 30-90 wt% based on the weight of the final basecoat composition.

Aqueous one-component aliphatic polyurethane dispersant,
Other water-reducible resins such as polyester resins, alkyd resins may be added to the paint to improve some film properties.

FC-120, sold by 3M;
FC-430, Surfonyl 104, Surfony sold by Air, Products
l 440, Triton X100 sold by Rohm and Haas, Troy
Troysol LAC, American sold by Chemical Company
Aerosol OT's, sold by Cyanamid and containing dialkyl sulfosuccinate salts, G
Additional anionic and nonionic surfactants may be added to the paint to increase the wetting of the substrate to the paint, such as Igepal's sold by AF and containing ethoxylated alkylphenols.

The final base coat viscosity is 0.001
It is about 10 Pa at a shear rate of 1/s, and 100
0.05 Pa at a shear rate of 0 1/s. This basecoat has a very high viscosity at low shear rates and a low viscosity at high shear rates. Due to this phenomenon, this coating composition has an excellent metallic effect. The time it takes for the paint to pass through #4 Ford Cup is 2
15-30 seconds at 3°C.

The coating compositions of the present invention may be applied using conventional spray equipment or high volume, low pressure spray equipment and produce high quality finishes. A clear topcoat may be applied over this basecoat after a drying time of 15 to 45 minutes. Examples of transparent topcoats include, but are not limited to, two-component systems based on polyisocyanate or silane-cured acrylic or polyester resins and acid-cured epoxy paints. . A preferred clear topcoat is a two-component acrylic polyisocyanate paint.

The following examples illustrate the invention:
It is not intended to limit the scope of the invention.

Example 1: Formation of a Base Coat Formation of an Acrylic Polymer Modified with Glycidyl Esters of Tertiary C10 Fatty Acids A 5-liter three-necked round-bottomed flask was equipped with a stirrer, thermometer, condenser, and nitrogen inlet. , monomer inlet installed, 680g methoxypropanol and 20g
of methyl ethyl ketone was charged. The mixture was brought to reflux and the temperature was adjusted to 140-141°C by adding 5.0 g of methyl ethyl ketone. 333g propenolic acid, 847 methyl-
2-Methyl-2-propionate, 450 g 2-ethylhexyl-2-methylpropionate, 180 g
isobornyl-2-methyl-2-propionate, 2
A monomer solution containing 7 g of Surfynol 440 was formed. A reaction initiation solution containing 36 g of t-butyl peroxobenzoate and 76 g of methoxypropanol was also formed. These monomer solutions and reaction starter solutions were added to the flask at a uniform flow rate over a period of 2 hours. After the addition is complete, add 35.
0g of methoxypropanol is flushed and 15g of t
A solution containing -butyl peroxobenzoate and 40 g of methoxypropanol was added over 10 minutes. The reaction was then held at reflux for 135 minutes. After reflux, 475 g of glycidyl esters of tertiary C10 fatty acids were added to the flask, heated to reflux temperature and allowed to react until constant acid number. The reaction is cooled and
Then 43g of methoxypropanol and 588g
of ethanol was added to the resin, which reduced the viscosity. The properties of the resin are viscosity Z5-Z6, solids content 60-61%, and acid value 53-56 based on solids.

Formation of component A (aluminum base) 44
．． 0g of the above acrylic resin was added to 19.0g of butoxyethanol. This mixture was stirred until a homogeneous solution was formed. Then 38.0 g of commercially available oil-based aluminum paste was added to the resin solution. The resulting slurry was stirred until a smooth, uniform slurry was formed. This aluminum base is 49.8
wt% volatile organic solvent, 38.4wt% solid material,
Contains 24.3 wt% aluminum pieces.

Formation of Component B (Neutralized Base) 8.0 g of 30% aqueous ammonia solution was added to 300 g of deionized water. The solution was thoroughly stirred before adding 100.0 g of acrylic resin. The resulting mixture was stirred until the solution became clear to slightly cloudy. The non-volatile content of this base was 14.8 wt%, the water content was 74.9 wt%, and the volatile organic oil content was 9.8 wt%. The final pH of this dispersion was 9.2.

Formation of component C (transparent resin latex) 48
．． 0g hydrophilic colloidal silica, 10.0g antifoam, and 1865g acrylic latex (Neoc
ryl A-622) was mixed in advance.

This mixture was then ground in a horizontal mill until the particle size was less than 8 microns. 260 g of deionized water was then added to the above slurry under stirring;
This formed a homogeneous latex solution. Silica content is 2.2wt%, volatile organic matter content is 8.9wt%, solid matter content is 28.3wt%
Met.

Formation of component D (pigment base) 80 g of N
eocryl A-6037 and 30% of 2.1g
Ammonia water, 23.9g of transparent red oxide,
A pigment slurry was formed containing 0.2 g of defoamer. The components mentioned above were mixed together and pre-dispersed using a Cowles blade. The mixture was then ground in a horizontal mill until the desired particle size was obtained. 70.
A drop solution containing 0g of grinding resin and 2.0g of aqueous ammonia was added to the grinding section. The resulting pigment paste was reduced with stirring in a solution containing 5.75 g deionized water and 19.2 g butoxyethanol. The resulting pigment base had a pH of 9.2, 48 wt.
% solid matter content, 9.4wt% volatile organic matter content, 36.2wt% binder content, 11.8wt
% pigment content, and water content of 42.0 wt%.

Formation of component E (surfactant base) 48g
2.0 g of polymeric nonionic fluorocarbon surfactant was added to 100 g of deionized water. The mixture was stirred to form a slightly cloudy solution.

Example 2: Formation of water-based red metallic base coat

[Table 3]

The compositions in Table 3 above were used to form a red metallic basecoat. The order of addition was as shown in Table 3. The entire solution was stirred after each component was introduced. The base coat is sprayed onto the primed panel with an epoxy primer. The base coat was sprayed onto the panel using conventional spray equipment until the base coat was covered. The base coat was allowed to flow along the panel for 30 minutes and then a clear coat was applied with an isocyanate-based clear paint. The final properties (including appearance properties) of the base coat after being applied with a conventional polyurethane clear coat are as shown in Table 4 below.

[0045]

[Table 4]

Example 3: Formation of water-based silver metallic base coat

[Table 5]

The composition of Table 5 above was used to form a silver metallic basecoat. The order of addition was as shown in Table 5. The entire solution was stirred after each component was introduced. The base coat is sprayed onto the primed panel with an epoxy primer. The base coat was sprayed onto the panel using conventional spray equipment until the base coat was covered. The base coat was allowed to flow along the panel for 30 minutes and then a clear coat was applied with an isocyanate-based clear paint. The final properties (including appearance properties) of the base coat after being applied with a conventional polyurethane clear coat are as shown in Table 6 below.

[0048]

[Table 6]

Although the present invention has been described above in detail with reference to specific examples, the present invention is not limited to such examples, and various embodiments are possible within the scope of the present invention. will be clear to those skilled in the art.

Claims (44)

[Claims] 1. A base coat composition for an automobile paint, comprising an aluminum base, a neutralized base, a transparent resin base, a pigment base, and a surfactant base. [Claim 2] The aluminum base is 1 on a solid basis.
a water-reducible, solvent-soluble acrylic resin having an acid value of 5 to 65 and a solids content of 50 to 75 wt%;
% metallic pigment, a total of 25 to 55 wt % of solid materials, a total of 35 to 50 wt % of a water-miscible organic solvent, and a total of 5 to 35 wt % of a binder. The base coat composition of claim 1, characterized in that: 3. The aluminum base is 1 on a solid basis.
a water-reducible, solvent-soluble acrylic resin having an acid value of 5 to 65 and a solids content of 50 to 75 wt%;
wt% solvent soluble aluminum pieces and a total of 25 to 55
2. The basecoat composition of claim 1, comprising: a total of 35 to 50 wt.% of a water-miscible organic solvent; and a total of 5 to 35 wt.% of a binder. 4. The aluminum base is 1 on a solid basis.
a water-reducible, solvent-soluble acrylic resin with an acid value of 5 to 65 and a solids content of 50 to 75 wt%, and a piece of aluminum of 4 to 30 wt% treated to be stable to water, for a total of 25 The basecoat composition of claim 1, comprising ~55 wt% solid material, a total of 35 to 50 wt% of a water-miscible organic solvent, and a total of 5 to 35 wt% of a binder. . 5. The aluminum base is 1 on a solid basis.
a water-reducible, solvent-soluble acrylic resin having an acid value of 5 to 65 and a solids content of 50 to 75 wt%;
mica flakes, a total of 25 to 55 wt% of solid materials, a total of 35 to 50 wt% of a water-miscible organic solvent, and a total of 5 to 35 wt% of a binder. The base coat composition of claim 1, characterized in that: 6. The neutralization base contains 0.1 to 15 wt% ammonia, an acid value of 15 to 65 on a solid basis, and an acid value of 50 to 65.
5-25 wt% water-reducible solvent-soluble acrylic resin with solids content of 75 wt% and 7.5-10.0 wt%
2. The basecoat composition of claim 1, comprising: a pH in the range of 5 to 25 wt% solid material. 7. The aluminum base is 1 on a solid basis.
a water-reducible, solvent-soluble polyester resin having an acid value of 5 to 65 and a solids content of 50 to 75 wt%;
30wt% metallic pigment and 25-55wt total
% of a solid substance, a total of 35-50 wt% of a water-miscible organic solvent, and a total of 5-35 wt% of a binder.
2. The base coat composition of claim 1, comprising: 8. The aluminum base is 1 on a solid basis.
a water-reducible, solvent-soluble polyester resin having an acid value of 5 to 65 and a solids content of 50 to 75 wt%;
30wt% solvent soluble aluminum pieces and a total of 25~
2. The basecoat composition of claim 1, comprising 55 wt% solid material, a total of 35 to 50 wt% water-miscible organic solvent, and a total of 5 to 35 wt% binder. 9. The aluminum base is 1 on a solid basis.
a water-reducible, solvent-soluble polyester resin having an acid value of 5 to 65 and a solids content of 50 to 75 wt%, and 4 to 30 wt% aluminum flakes treated to be water stable, for a total of 25 The basecoat composition of claim 1, comprising ~55 wt% solid material, a total of 35 to 50 wt% of a water-miscible organic solvent, and a total of 5 to 35 wt% of a binder. . 10. The aluminum base comprises a water-reducible, solvent-soluble polyester resin having an acid value of 15 to 65 and a solids content of 50 to 75 wt% on a solid basis;
~30 wt% mica flakes, a total of 25-55 wt% solid material, a total of 35-50 wt% water-miscible organic solvent, and a total of 5-35 wt% binder. The base coat composition of claim 1, characterized in that: 11. The neutralization base contains 0.1 to 15 wt% ammonia, an acid value of 15 to 65 on a solid basis, and an acid value of 50 to 50.
5-25 wt% with solid material content of ~75 wt%
a water-reducible solvent-soluble polyester resin of 7.5 to 1
a pH in the range of 0.0 and 5 to 25 wt% solid material;
2. The base coat composition of claim 1, comprising: 12. The aluminum base comprises a water-reducible, solvent-soluble alkyd resin having an acid value of 15 to 65 and a solids content of 50 to 75 wt% on a solid basis;
0 wt% metallic pigment and 25-55 wt% total
The basecoat composition of claim 1, comprising a total of 35 to 50 wt% of a water-miscible organic solvent, and a total of 5 to 35 wt% of a binder. 13. The aluminum base comprises a water-reducible solvent-soluble alkyd resin having an acid value of 15 to 65 and a solids content of 50 to 75 wt% on a solid basis;
0 wt% solvent soluble aluminum pieces and a total of 25-5
2. The basecoat composition of claim 1, comprising 5 wt% solid material, a total of 35 to 50 wt% water-miscible organic solvent, and a total of 5 to 35 wt% binder. 14. The aluminum base is treated to be stable to water with a water-reducible, solvent-soluble alkyd resin having an acid value of 15 to 65 and a solids content of 50 to 75 wt% on a solids basis. 4 to 30 wt% aluminum flakes, a total of 25 to 55 wt% of solid materials, a total of 35 to 50 wt% of a water-miscible organic solvent, and a total of 5 to 35 wt% of a binder. 2. The base coat composition of claim 1, further comprising: 15. The aluminum base comprises a water-reducible solvent-soluble alkyd resin having an acid value of 15 to 65 and a solids content of 50 to 75 wt% on a solid basis;
0 wt% of mica flakes, a total of 25 to 55 wt% of solid substances, a total of 35 to 50 wt% of a water-miscible organic solvent, and a total of 5 to 35 wt% of a binder. The base coat composition of claim 1, characterized in that: 16. The neutralization base contains 0.1 to 15 wt% ammonia, an acid value of 15 to 65 on a solid basis, and an acid value of 50 to 50.
5-25 wt% with solid material content of ~75 wt%
a water-reducible solvent-soluble alkyd resin of 7.5 to 10.
2. The basecoat composition of claim 1, comprising a pH in the range of 0 and 5 to 25 wt% solid material. [Claim 17] The clear resin base has a weight of 20 to 60wt.
% solid matter content and a glass transition temperature of 10-50°C and 1.0-12.0%.
wt% water-miscible solvent and 1.0 to 8.0 wt%
hydrophilic colloidal silica and a total of 20 to 60 wt%
2. The base coat composition of claim 1, comprising a solid material. [Claim 18] The clear resin base has a weight of 20 to 60 wt.
% solid matter content and a glass transition temperature of 10-50°C and 1.0-12.0%.
wt% water-miscible solvent and 1.0-10000
2. The basecoat composition of claim 1, comprising 1.0 to 8.0 wt% hydrophilic colloidal silica having a particle size of mμ and a total of 20 to 60 wt% solid materials. 19. The pigment base comprises an acrylic latex resin having a solids content of 20 to 60 wt% and a glass transition temperature of 10 to 50°C, 0 to 25 wt% of a water-miscible solvent, and 0.1 to 25 wt% of a water-miscible solvent. The basecoat composition of claim 1, comprising -45.0 wt% inorganic or organic pigment and a total of 5-60 wt% solid materials. 20. The pigment base comprises an acrylic latex resin having a solids content of 20 to 60 wt% and a glass transition temperature of 10 to 50°C, 0 to 25 wt% of a water-miscible solvent, and 0.1 to 25 wt% of a water-miscible solvent. 2. The basecoat composition of claim 1, comprising -45.0 wt% inorganic or organic dye and a total of 5-60 wt% solid materials. 21. The surfactant in the surfactant base used dissolved in water at a concentration of 0.1 to 5.0 wt% contains fluorine in an amount of 2 to 25 wt% based on the weight of the surfactant. a polymeric nonionic fluorinated hydrocarbon surfactant having an average molecular weight of 5000 to 50000, and 30 to 70% ethylene oxide linkage based on the weight of the surfactant. 2. The basecoat composition of claim 1, wherein the basecoat composition is selected from the group consisting of: 22. The base coat composition of claim 1, which is overcoated with a clear coat composition. 23. The base coat composition of claim 1, which is overcoated with a polyurethane clear coat composition. 24. A method of forming a basecoat composition comprising mixing an aluminum base with a neutralized base and further adding a transparent resin base, a pigment base, and a surfactant base. 25. The aluminum base comprises a water-reducible, solvent-soluble acrylic resin having an acid value of 15 to 65 and a solids content of 50 to 75 wt% on a solid basis;
0 wt% metallic pigment and 25-55 wt% total
25. The method of claim 24, comprising a total of 35 to 50 wt% of a water-miscible organic solvent, and a total of 5 to 35 wt% of a binder. 26. The aluminum base comprises a water-reducible, solvent-soluble acrylic resin having an acid value of 15 to 65 and a solids content of 50 to 75 wt% on a solid basis;
0 wt% solvent soluble aluminum pieces and a total of 25-5
25. The method of claim 24, comprising 5 wt% solid material, a total of 35 to 50 wt% water-miscible organic solvent, and a total of 5 to 35 wt% binder. 27. The aluminum base is treated to be stable to water with a water-reducible, solvent-soluble acrylic resin having an acid value of 15 to 65 and a solids content of 50 to 75 wt% on a solid basis. 4 to 30 wt% aluminum flakes, a total of 25 to 55 wt% of solid materials, a total of 35 to 50 wt% of a water-miscible organic solvent, and a total of 5 to 35 wt% of a binder. 25. The method of claim 24. 28. The aluminum base comprises a water-reducible, solvent-soluble acrylic resin having an acid value of 15 to 65 and a solids content of 50 to 75 wt% on a solid basis;
0 wt% of mica flakes, a total of 25 to 55 wt% of solid substances, a total of 35 to 50 wt% of a water-miscible organic solvent, and a total of 5 to 35 wt% of a binder. 25. The forming method according to claim 24. 29. The neutralization base contains 0.1 to 15 wt% ammonia, an acid value of 15 to 65 on a solid basis, and a
5-25 wt% with solid material content of ~75 wt%
a water-reducible solvent-soluble acrylic resin of 7.5 to 10.
25. The method of claim 24, comprising: a pH in the range of 0, and 5 to 25 wt% solid material. 30. The aluminum base comprises a water-reducible, solvent-soluble polyester resin having an acid value of 15 to 65 on a solid basis and a solids content of 50 to 75 wt%;
~30wt% metallic pigment and 25~55w total
25. The method of claim 24, comprising t% solid material, a total of 35 to 50 wt% of a water-miscible organic solvent, and a total of 5 to 35 wt% of a binder. 31. The aluminum base comprises a water-reducible, solvent-soluble polyester resin having an acid value of 15 to 65 on a solid basis and a solids content of 50 to 75 wt%;
~30 wt% solvent soluble aluminum pieces and a total of 25
24. Claim 24, characterized in that it consists of ~55 wt% solid material, a total of 35 to 50 wt% of a water-miscible organic solvent, and a total of 5 to 35 wt% of a binder.
How to form. 32. The aluminum base is treated to be stable to water with a water-reducible, solvent-soluble polyester resin having an acid value of 15 to 65 and a solids content of 50 to 75 wt% on a solids basis. 4 to 30 wt% of aluminum pieces and a total of 25 to 55 wt% of solid material;
A total of 35 to 50 wt% of a water-miscible organic solvent;
25. The method of claim 24, comprising a total of 5 to 35 wt% binder. 33. The aluminum base comprises a water-reducible, solvent-soluble polyester resin having an acid value of 15 to 65 on a solid basis and a solids content of 50 to 75 wt%;
~30 wt% mica flakes, a total of 25-55 wt% solid material, a total of 35-50 wt% water-miscible organic solvent, and a total of 5-35 wt% binder. 25. The method of claim 24. 34. The neutralization base contains 0.1 to 15 wt% ammonia, an acid value of 15 to 65 on a solid basis, and an acid value of 50 to 50.
5-25 wt% with solid material content of ~75 wt%
a water-reducible solvent-soluble polyester resin of 7.5 to 1
a pH in the range of 0.0 and 5 to 25 wt% solid material;
25. The method of claim 24, further comprising: 35. The aluminum base comprises a water-reducible solvent-soluble alkyd resin having an acid value of 15 to 65 and a solids content of 50 to 75 wt% on a solid basis;
0 wt% metallic pigment and 25-55 wt% total
25. The method of claim 24, comprising a total of 35 to 50 wt% of a water-miscible organic solvent, and a total of 5 to 35 wt% of a binder. 36. The aluminum base comprises a water-reducible, solvent-soluble alkyd resin having an acid value of 15 to 65 and a solids content of 50 to 75 wt% on a solid basis;
0 wt% solvent soluble aluminum pieces and a total of 25-5
25. The method of claim 24, comprising 5 wt% solid material, a total of 35 to 50 wt% water-miscible organic solvent, and a total of 5 to 35 wt% binder. 37. The aluminum base is treated to be stable to water with a water-reducible, solvent-soluble alkyd resin having an acid value of 15-65 on a solids basis and a solids content of 50-75 wt%. 4 to 30 wt% aluminum flakes, a total of 25 to 55 wt% of solid materials, a total of 35 to 50 wt% of a water-miscible organic solvent, and a total of 5 to 35 wt% of a binder. 25. The method of claim 24. 38. The aluminum base comprises a water-reducible solvent-soluble alkyd resin having an acid value of 15 to 65 and a solids content of 50 to 75 wt% on a solid basis;
0 wt% of mica flakes, a total of 25 to 55 wt% of solid substances, a total of 35 to 50 wt% of a water-miscible organic solvent, and a total of 5 to 35 wt% of a binder. 25. The forming method according to claim 24. 39. The neutralization base comprises 0.1 to 15 wt% ammonia, an acid value of 15 to 65 on a solid basis, and an acid value of 50
5-25 wt% with solid material content of ~75 wt%
a water-reducible solvent-soluble alkyd resin of 7.5 to 10.
25. The method of claim 24, comprising: a pH in the range of 0, and 5 to 25 wt% solid material. [Claim 40] The clear resin base has a weight of 20 to 60wt.
% solid matter content and a glass transition temperature of 10-50°C and 1.0-12.0%.
wt% water-miscible solvent and 1.0 to 8.0 wt%
hydrophilic colloidal silica and a total of 20 to 60 wt%
25. The method of claim 24, wherein the solid material comprises: [Claim 41] The clear resin base has a weight of 20 to 60 wt.
% solid matter content and a glass transition temperature of 10-50°C and 1.0-12.0%.
wt% water-miscible solvent and 1.0-10000
25. The method of claim 24, comprising 1.0 to 8.0 wt% hydrophilic colloidal silica having a particle size of m[mu] and a total of 20 to 60 wt% solid material. 42. The pigment base comprises an acrylic latex resin having a solids content of 20 to 60 wt% and a glass transition temperature of 10 to 50°C, 0 to 25 wt% of a water-miscible solvent, and 0.1 to 25 wt% of a water-miscible solvent. 25. The method of claim 24, comprising -45.0 wt% inorganic or organic pigment and a total of 5-60 wt% solid material. 43. The pigment base comprises an acrylic latex resin having a solids content of 20 to 60 wt% and a glass transition temperature of 10 to 50°C, 0 to 25 wt% of a water-miscible solvent, and 0.1 to 25 wt% of a water-miscible solvent. 25. The method of claim 24, comprising -45.0 wt% inorganic or organic dye and 5-60 wt% total solid material. 44. The surfactant in the surfactant base used dissolved in water at a concentration of 0.1 to 5.0 wt% contains 2 to 25 wt% of fluorine based on the weight of the surfactant. a polymeric nonionic fluorinated hydrocarbon surfactant having an average molecular weight of 5,000 to 50,000, and ethylene oxide in an amount of 30 to 70% based on the weight of the surfactant. 25. The method of claim 24, wherein the surfactant is selected from the group consisting of a polymeric nonionic fluorohydrocarbon surfactant comprising: