JPH0245578A - Paint composition - Google Patents

Abstract

PURPOSE:To obtain a top-coating paint composition for household furniture, electrical appliance, car, etc., required to have good appearance by adding mica, flaky pigment having metallic luster and titanium black pigment at specific ratios to a resin composition composed of a thermosetting film-forming resin, a crosslinking agent and a solvent. CONSTITUTION:The objective composition can be produced by compounding (A) a thermosetting resin composition composed of a thermosetting film-forming resin, a crosslinking agent and a solvent with (B) an interference mica and/or a flaky pigment having metallic luster and (C) a titanium black pigment. The weight ratio of the solid pigment of the components B+C in the composition is 2-40% and the ratio of the component C to the components B+C is 0.5-35wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a coating composition, and particularly to a top coating composition for furniture, household electrical appliances, automobiles, etc. that require aesthetic appearance.

Conventional technology Conventional top coat paints for automobiles include surface finishes using solid color using pigments such as titanium oxide and iron oxide, and metallic color using metal powder such as aluminum powder. As an example, a two-coat, one-bake finish including an acrylic resin-based metallic base coat is introduced in Japanese Patent Publication No. 411-3 Q+l 115.

However, recently, in the fields of automobiles and home appliances, there has been a stronger demand for discrimination based on appearance and hue than ever before.
No. 23 proposes a mica color finish in which a coating mica layer is laminated on a base and color having a specific hue to exhibit a sense of brilliance not found in metallic coatings.

However, there are limits to the color and appearance of paint films that can be expressed with conventional paints; for example, paint films with a silk-like appearance or dark glittering paint films are created by simply combining conventionally known pigments. You can't get it by yourself. For example, when creating a paint film by combining carbon black and interference mica in order to obtain a silk-like appearance, the paint color retains a Buddha-like appearance and the desired silk-like appearance cannot be obtained. However, something like this has not yet been presented in practical terms.

Problems to be Solved by the Invention Therefore, an object of the present invention is to provide a coating composition that can provide a silk-like coating film and a mica color coating film with a glittering appearance and a high degree of design, which have not been previously available. An object of the present invention is to provide a thermosetting resin set 5 consisting of a thermosetting film-forming resin, a crosslinking agent, and a solvent. j, the material contains <A) interference mica, metal scale pigment, or a combination thereof, and (B) titanium black pigment dispersed therein, and the pigment solid content weight ratio of (A) + (B) is 2. ~4096, and (B) is (A
) + (B) 1] is present in a coating composition in a proportion of 5 to 35% by weight.

The interference mica used in the present invention is titanium oxide, iron oxide,
Any mica particles whose surface is coated with chromic acid or the like alone or in combination of two or more, which are commonly used for pearl coatings, etc., can be used. (In this example, for example, Exterior Marlin Bly) / White (Mearl Corpora
tion) products, titanium oxide coat), Exterior Marlin Highlight Blue (the company's product, acid 1 titanium coat), Exterior Marlin Lase Soto (the company's product,
Acid, r arsenate coat, acid (hititanium coat), HARCLACE SME-11fl-") (Nihon Jyusho, 'm product, titanium oxide coat) Bar 7 Wraith SMBQO-9 (Nippon Jyusho (m product, acid) (Hititanium coat) Pearl steel chair S M C5112-'1ci9 (Nippon Jusho 1... product, acid r arsenate, 1,000 tananium oxide coat), etc.

Aluminum foil is a typical metal Qgi-like pigment,
For example, Toyo Aluminum Manufacturing's Alpaste 713
flN, Alpaste 51-231, Alpace l-5
2-509 etc. are exemplified as usable ones.

The titanium black pigment used in combination with the above-mentioned interference mica and/or metal flake pigment is a black pigment consisting of 1,000 tanoic acid excluding titanium dioxide, called so-called lower titanium oxide. Various colors are available depending on the degree of reduction, and can be selected and used as desired.

In terms of compositional formula, for example, Ti01Ti203, Ti3
O5, Ti4O7, TizoO31, etc. are mentioned, and these are -clothing cost; Ti02-, (where X is 0<x<2
can be expressed as a full real number). Maki's examples include black titanium oxide M-1, black titanium oxide S1 (all manufactured by Ishihara Sangyo (m products)), titanium black powder 13R, and titanium black 10S (all manufactured by Mitsubishi Metals (m products)).

In addition, if desired, the range [
In Kawauchi, it is possible to use appropriate amounts of coloring pigments, wood pigments, rust-preventive pigments, chipping-resistant pigments, etc. other than those mentioned above in combination with the above-mentioned pigment mixture system.

Such a pigment mixture system is dispersed in a thermosetting resin composition consisting of a thermosetting resin, a crosslinking agent, and a solvent. Polyester resin consisting of alcohol and polybasic acid, and Alki-F modified with oil etc.
It is convenient to use acrylic resins made of I5 (acrylic acid, (meth)acrylic acid, (meth)acrylic acid esters, etc., which are usually used as thermosetting binder resins in the paint field, and melamine resin as a crosslinking agent). It can be combined with pro-tsukiisocyanate, etc.

Next, when (A > interference mica, metal scale face n, or a combination thereof and (B) titanium black pigment, the pigment solid content weight ratio of (A) + (B) is the solid content of the coating composition. It is necessary to have a content of 2 to 4096 based on the total weight. If it is less than 2% by weight, it will be difficult to obtain the desired appearance and hue, while if it exceeds 40% by weight,
Excess pigment causes glossy sink marks on the coated surface and makes it difficult to maintain sufficient coating performance, which is undesirable.

In addition, the titanium black pigment (B) should be 115 to 359 of the total amount of interference mica, metal flake pigment (A), and titanium black pigment (B), and if it is less than 0.5°6, a silky feeling will occur. Moreover, if it exceeds 35°6, the color becomes close to black, and the shine disappears, so both are unfavorable and it has been confirmed that the design quality will be lost. 8. Scales of interference mica, aluminum foil, etc. Titanium black pigments can be dispersed uniformly by making a paste that has been dispersed in advance with an appropriate solvent, or by directly mixing it with the paint liquid while stirring. After uniformly dispersing it in a portion of hard acrylic fat-soluble varnish, the remaining acrylic resin, melamine resin, etc. are added and dissolved to prepare a dispersion liquid.

Therefore, when preparing a coating composition, first a dispersion of titanium black pigment is prepared, and the flaky pigment is suitably mixed therein either directly or in the form of a solvent paste.

The coating composition of the present invention can be applied as a finishing top coat to various objects to be coated with thermosetting paints, and can exhibit a unique aesthetic effect, or can be used for fixtures and home use that require a particularly aesthetic appearance. It is useful as a top coat for electrical products, automobiles, etc. Among these, representative coating systems include 2 coat 1 to 1 bake coating systems for automobiles, and the present coating composition is particularly useful as a base coat for these 2 coat 1-1 bake coating systems.

Here, the 2-coat, 1-bake coating system refers to a coating system related to topcoat paints, and in the case of metal objects such as automobiles, a chemical conversion treatment is usually performed first, followed by an electrodeposition primer (dry film thickness). , usually 15-3011) is applied, then an intermediate coating is applied (dry film thickness, usually 35-40μ), dry baking is performed, and if desired, the surface is smoothed at the main office, etc. Later on, this two-coat, one-bake coating system is applied, i.e., first a pigment-rich base coat is applied, followed by a second coat, either a transparent clear or a low-pigment color clear.・Apply Knob Coat wet-on-unit and bake harden it to form a base coat layer (dry film thickness, usually 10
~211μ) and a clear or color clear layer (dry film thickness, usually 25 to 40μ).

When the coating composition according to the present invention is applied to a surface to be coated, a coating film with a calm silky tone and excellent design properties, which could not be obtained with conventional coatings, can be obtained.
When painting finished electrical appliances, fixtures, etc., it becomes possible to differentiate it from conventional products, leading to a significant increase in product value5.
Detailed explanations will be given below based on Examples, unless otherwise specified. 6 is due to overlapping.

Example 1 20 parts of h-luene was added to 2 parts and 1 part of interference mica (manufactured by Marl Corporation, Exterior Marine Bright White) and uniformly dispersed.

Apart from this, there are three types of Mitsubishi including titanbura and Tsuku pigments (medium shock,
166. 20 parts of titanium black powder 13R) was previously mixed with thermosetting acrylic (M fat varnish (Mitsui Toatsu + T4F, Almatex NT-U-448, resin solid content 48%).
Mix 7 parts with the same volume of 2mmφ crow pieces and disperse for 60 minutes using a disperser.
-60, resin solids content 60%) was added and 3
Stir for 0 minutes, filter and remove glass beads. Examples 2 to 8 The same raw materials as in Example 1 were used, except that the previously prepared interference mica paste was added to this titanium black pigment-dispersed varnish and stirred uniformly to form a coating liquid. Each coating liquid was prepared in the same manner as in Example 1, except that the amounts of each raw material were changed to those shown in Table 1.

Example 9 A coating liquid was prepared using the same formulation and method as in Example 2, except that the interference mica in Example 2 was replaced with an aluminum foil pigment (Alpaste 713ON, manufactured by Toyo Aluminum Co., Ltd., manufactured by Kiki, solid content 65%).

Comparative Example 1 20 parts of toluene was added to 20 parts of interference mica (manufactured by Marl Corporation, Exterior Marlin Bright White) and stirred.
Separately, thermosetting acrylic (M resin varnish (Almatex NT-Den J-40) > 166.7 parts and melamine resin 1-finger fest (Super Beckamine, Engineering 826-
60) Add 33.3 parts and stir with a disper for 30 minutes. The previously prepared interference mica paste was added to this varnish and stirred uniformly to form a coating liquid.

Comparative example 2 Titanium black pigment (Titanium black powder 13R) 20
Thermosetting acrylic resin varnish (Almatex N)
T-11-448>! 66.7 parts, and °Melamine resin varnish (Super Beckamine J-1126-
60) Add 33.3 parts to make the same volume (approx. 200ml)
) and stirred with a disper for 60 minutes, removed the glass pieces by filtration, and adjusted the paint solution (see below for margins) Preparation of painted test plate Sound steel plate (length 500cm) , width 3011 order, thickness 0.8
1) was pretreated with a zinc phosphate treatment agent (manufactured by Nippon Paint Co., Ltd., Granodin 5D51] 00) in a conventional manner, and then treated with a cationic electrodeposition paint (manufactured by Nippon Paint Co., Ltd., Power Top U-
No. 30, epoxy urethane/cationic resin system) was electrocoated using a conventional method to form an electrocoated film with a dry thickness of 20 μm. Then, an intermediate coating (manufactured by Nippon Paint, Olga P-2 Gray, polyester melamine resin system) was applied by a conventional method to form an intermediate coating film with a dry film thickness of 735 μm.

On top of this, dilute each paint solution shown in Table 1 above with paint thinner (Nippon Paint +-+M, Nizpe 298).
13 seconds '2n'C) with 4 fort power and Tsubu, Sufu.

1/-Kan (H book Unsberg I+@, R, 13A,
), Zurkya 7No, +;) electrostatic spray Wr coating (first
Between the first and second coats (C), the coating was applied for 1 minute and then coated twice) to form a coating film (converted to a dry film thickness of 5μ). Painted with Uni Sototen clear paint (manufactured by Nippon Paint, Super La Tsuk 0-28L, acrylic/melamine resin system) 14
Coated test plates corresponding to each of the Examples and Comparative Examples were prepared by baking at 0'C for 20 minutes to form a coating film with a total dry film thickness of 110μ.

Five test results were conducted on this coated test board. Compared to Comparative Example 3, Examples 1 to 1o had a silky, muted hue.

Claims (1)

[Scope of Claims] A thermosetting resin composition comprising a thermosetting film-forming resin, a crosslinking agent, and a solvent, and (A) interference mica, metal scale pigment, or a combination thereof, and (B) titanium black. (A) + (B) has a pigment solid content weight ratio of 2 to 40%, and (B) is dispersed in (A) +
A coating composition characterized in that (B) is present in a proportion of 0.5 to 35% by weight.