JPH06287482A - Hammer tone coating - Google Patents

Abstract

PURPOSE:To obtain hammer tone coating without using silicone oil such as conventional hammer tone coating and excellent in coating film performances such as adhesion to the base, hardness, abrasion resistance and scratch resistance and finishing handle. CONSTITUTION:The hammer tone coating contains, as a base, a mixture obtained by adding (C) 0.1-8.0wt.% vinyl-based polymer defoaming agent to a resin solid content consisting of (A) 50-90wt.% polyester resin having a hydroxyl group and having 25-80mgKOH/g hydroxyl value, 2000-15000 weight-average molecular weight and 1-12 acid value and (B) 50-10wt.% melanin resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hammertone paint which has an uneven pattern formed on the surface of an article to be coated and which has excellent finish and coating film performance.

[0002]

2. Description of the Related Art Hammertone paint has been conventionally used as one of the coating methods for finishing the surface of an object to be coated into an uneven pattern. It is called a hammer tone paint because it forms a uniform pattern like a metal hammer (hammer) hitting the surface of a metal. Hammertone finishing has the advantage that the finished pattern is relatively beautiful and that it is possible to achieve a coating finish that is excellent in adhesion to the substrate, hardness, abrasion resistance, scratch resistance, etc. in terms of its coating film performance as well. have. Hammertone paints are used for relatively small items such as sewing machines, air conditioners, stoves, and audio equipment, as well as shutters, outer wall materials, and pre-coated metal. Conventionally, as a hammertone paint, an appropriate amount of silicone oil has been added to the paint, and when the paint is applied to the surface of an object to be coated, a hammertone pattern appears due to the action of the silicone oil after a few minutes,
It is known that a paint that completes a hammer tone finish when dried as it is.

[0003]

However, in the conventional hammertone paint to which the above-mentioned silicone oil is added, the particles of the paint adhere to the surface of the object to be coated with another kind of paint, or the paint. When mixed with other types of paint, there is a high risk of causing a coating failure phenomenon such as cissing or dents on the coated surface of the other type of paint. Therefore, the conventional hammertone paint manufacturing environment and painting environment require a troublesome measure such as isolation from other work departments, which is a serious problem. In addition, if another surface is coated with the conventional hammertone paint, there is a drawback that a similar coating failure phenomenon as described above occurs due to the influence of silicone oil.
The present invention, in view of the above situation, without using silicone oil such as conventional hammertone paint, and adhesion with the substrate, hardness, abrasion resistance, coating performance such as scratch resistance and the like. The purpose is to provide a hammer tone paint with an excellent finish.

[0004]

According to the present invention, the component (A) has a hydroxyl value of 25 to 80 mgKOH / g and a weight average molecular weight of 200.
Component (C) with respect to the resin solid component consisting of 50 to 90% by weight of a polyester resin having a hydroxyl group of 0 to 15000 and an acid value of 1 to 12 and 50 to 10% by weight of the component (B) melamine resin. Provided is a hammertone paint based on a mixture containing 0.1 to 8.0% by weight of a vinyl polymer defoaming agent. The component (A) hydroxyl group-containing polyester resin used in the present invention is a known oil-free type polyester resin having a hydroxyl value of 25 to 80 mg.
KOH / g, a weight average molecular weight of 2,000 to 15,000 and an acid value of 1 to 12, preferably 2 to 10 are used. As such polyester resin, Beckolite M-6402-50 [manufactured by Dainippon Ink and Chemicals, Inc., trade name], Byron GK13CS [manufactured by Toyobo Co., Ltd., trade name] and the like can be used. As the melamine resin of the component (B) used in the present invention, a low temperature at the time of baking,
Any material that can be cured with the above polyester resin in a short period of time may be used, and a melamine resin used in a usual heat-drying type coating material can be used. For example, methylated melamine resin,
Butylated melamine resin, mixed alkylated melamine resin and the like can be used. The mixing ratio of the components (A) and (B) is 50 to 90% by weight with respect to the latter 50 to 90% by weight.
It is 10% by weight. If the content of the former is less than 50% by weight, the moldability of the coating film will decrease, and if it exceeds 90% by weight, the hardness of the coating film will decrease, so both are not preferable. The component (C), a vinyl-based polymer defoaming agent used for forming a hammertone pattern in the present invention, can be obtained by polymerizing a vinyl monomer. Those which have a low compatibility with (A) and (B) and which are originally commercially available as an antifoaming agent are commercially available as, for example, Disparlon # 19.
50N [Kusumoto Kasei Co., Ltd. trade name, vinyl polymer, average degree of polymerization 200], Disparon # 1925 [Kusumoto Kasei Co., Ltd.]
Product name], Floren AC-300, Floren AC-
303, Floren AC-900 [Kyoeisha Yushi Kagaku Kogyo]
Brand name], BYK-051, BYK-052, BY
K-053 [trade name of Big Chemie Japan Co., Ltd.] and the like can be preferably used.

When a suitable amount of the component (C) is dispersed and coexisted in the coating material as fine particles, the fine particles of the component (C) act on the surface of the coating film immediately after coating the coating material to form a hammer tone pattern. Therefore, it is possible to obtain a finished texture similar to that of the conventional hammertone paint containing silicone oil. The blending amount of the component (C) is the same as the components (A) and (B).
It is 0.1 to 8.0% by weight based on the total resin solid content.
If the blending amount is less than 0.1% by weight, a hammertone pattern is not formed, and if it exceeds 8.0% by weight, the hammertone pattern is not clear and the image becomes blurry. In the hammertone paint of the present invention,
In addition to the components (A), (B) and (C) as described above, pigments, dyes, solvents, additives and the like generally used for paints can be added, if necessary. As the pigment, a coloring pigment, an extender pigment or the like can be used, and for example, aluminum paste, pearl, titanium oxide, carbon black, red iron oxide, silica, mica, calcium carbonate or the like can be used. The amount of the pigment blended is not particularly limited, but it needs to be determined in consideration of viscosity, coating workability and the like. Examples of the additive include a pigment dispersant and an anti-scratch agent. Above all, it is effective to add a fluororesin powder such as polytetrafluoroethylene resin powder having a melting point of 300 ° C. or higher in the coating material in an amount of 4% by weight or less as a scratch preventing agent. As the fluororesin powder, in addition to the above polytetrafluoroethylene, fluororesin powders such as polychlorotrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, and polyvinylidene fluoride can be used. Even if the blending amount of the fluororesin powder is 4% by weight or more, a scratch preventing effect commensurate with the blending cannot be obtained. Such a scratch-resistant fluororesin powder is commercially available, for example, from Foster Freon TF.
-9205 [trade name of Hoechst Japan KK] and the like can be preferably used. As a method for preparing the hammertone paint of the present invention, a usual method for producing a paint can be applied, and one example of the preparation method will be described below, but the present invention is not limited thereto. First, a polyester resin, a melamine resin, a solvent and a pigment are mixed, and the pigment particles are dispersed to 20 μm or less by a sand mill, an attritor, a roller mill or the like (when the pigment is only aluminum paste or pearl, it is sufficient to stir with a disper). Then, the vinyl polymer defoaming agent of the component (C) is mixed and sufficiently dispersed, and subsequently, an aluminum paste and an additive are added, and the mixture is stirred and mixed with a disper to prepare. As a coating method, spray coating, electrostatic coating, roller coating and the like are possible.

[0006]

EXAMPLES Next, the present invention will be specifically described with reference to Examples and Comparative Examples. Examples 1 to 6, Comparative Examples 1 to 3 and Reference Example 1 (Preparation of Sample Paint) A polyester resin, a melamine resin and a solvent were mixed according to the formulation shown in Table 1, and then the component (C) was mixed. And disperse well. Subsequently, 10 kinds of sample paints were prepared by adding aluminum paste and additives and stirring and mixing them with a disper.

[0007]

[Table 1]

Note 1) Beckolite M-6402-50 [manufactured by Dainippon Ink and Chemicals, Inc., trade name: hydroxyl value 40-70 mgK
OH / g, weight average molecular weight 3000 to 5000, resin acid value 5 to 10, nonvolatile content 50 wt% xylene solution] 2) Byron GK13CS [Toyobo Co., Ltd., trade name: hydroxyl value 30 to 60 mg KOH
/ G, weight average molecular weight 5000 to 8000, resin acid value 2
~ 4, non-volatile content 50 wt% xylene solution] 3) Cymel 325 [trade name: Methylol melamine resin, 60 wt% n-butanol solution, manufactured by Mitsui Cyanamid Co., Ltd.] 4) Vinyl polymer [Kusumoto Kasei Co., Ltd. ), Product name: average weight 200] 5) Aluminum paste SAP260N [Showa Aluminum Co., Ltd.]
Product name] 6) Fosteron TF9205 [Hoechst Japan K.K.
Made, trade name] 7) Silicon TRS10N [made by Hoechst Japan Ltd.,
Product name] Preparation of test piece As the coated plate to be used, chemical conversion treatment is applied, thickness 0.4 m
m hot-dip galvanized steel sheet was used. As a painting method,
First, as the undercoat paint, polyester / melamine resin-based paint [Product name: Pre-color No. 3800 White [NOF
Co., Ltd.]] was applied using a bar coater # 20 to a dry coating film thickness of 20 μm, and the ultimate plate temperature was 210 ° C.
It was dried by heating for 0 seconds. Next, each of the sample paints described above was applied using a bar coater # 20 so that the dry coating film thickness was 20 μm, and dried at an ultimate plate temperature of 210 ° C. for 30 seconds to prepare a test piece. The produced test piece was tested by the following test method. The results are shown in Table 2.

[0009]

[Table 2]

(1) Appearance of coating film The design property of the coating surface finish is visually observed, and the hammer tone pattern of the coating surface is equivalent to or higher than that of the conventional coating material (Reference Example 1). ◎ or ○ (pass)
And (2) Pencil hardness A test was conducted in a room at 20 ° C. according to JIS D-0202. Those that were harder than H were accepted. (3) Adhesion In a room at 20 ° C., first, a test piece coating film JIS K-540
According to the method of 6.15 (cross-cut test) of No. 0, a cross-cut is made with a cutter knife, and the test piece is extruded by an Erichsen tester by 6.0 mm from the back surface of the part. After that, sufficiently adhere the cellophane adhesive tape on the grid and immediately instantly peel off the cellophane tape in the direction perpendicular to the coating surface, pass the grid with 100 grids remaining without peeling, pass 99 or less. It was rejected. (4) Workability In the room of 20 degreeC, the coated surface of each test piece is made into an outer side, and the same to-be-coated plate as a test piece is 1 sheet (1T) -6 sheets (6) inside it.
T) was inserted, clamped with a vise, and bent 180 degrees in close contact. The bent tip was observed with a 10 times magnifying glass, and the processing level at which cracks were free was shown. 1T to 4T were regarded as acceptable. (5) Impact resistance In a room at 20 ° C, JIS K-5400 6.13.1
The test was conducted based on (Method B) (impact resistance test). Then, the cellophane adhesive tape was sufficiently adhered to the test site on the coated surface, and immediately the cellophane tape was instantaneously peeled off in the direction perpendicular to the coating surface to examine the state of peeling. The state in which it did not come off and remained completely was regarded as acceptable. (6) Scratch resistance In a room at 20 ° C, a surface tester HEIDON-14
S [manufactured by Shinto Kagaku Co., Ltd.] was used. Combine the coating surfaces of the test pieces together, weight 833 g / in ² , moving speed 5000 mm / mi
The coated surface after the test was observed by rubbing 100 times back and forth with n and a moving width of 5 cm, and evaluated according to the following. ⊚: No scratches were found ○: Slight scratches were observed (Pass) Δ: A scratch is recognized. (Failure) x: Severe scratches or hammer tone pattern scraped. As is clear from the results shown in Table 2, in the samples of Examples 1 to 6 according to the present invention, the coating surface condition was good, and any of pencil hardness, adhesion, workability, impact resistance, and scratch resistance were obtained. Also shows a satisfactory result, and it is found that the coating performance is comparable to that of the sample of Reference Example 1 which is a conventional hammertone paint. On the other hand, the samples of each comparative example deviating from the present invention showed unsatisfactory results in at least one of the test items. As described above, the hammertone paint according to the present invention is clearly an excellent paint.

[0011]

EFFECTS OF THE INVENTION Since the hammertone paint according to the present invention does not contain silicone oil in the paint, adverse effects on other paints and paint defects such as cissing and dents do not occur, and the paint manufacturing environment and paint environment Also, in the case of (1), it is not necessary to separate it from other paints, and thus the special measures required in the conventional hammertone paints are not necessary. It also has excellent coating performance such as adhesion to the substrate, hardness, abrasion resistance, scratch resistance, etc., and shows performance equivalent to or better than conventional hammertone paints. Further, by adjusting the blending amount of the vinyl polymer defoaming agent as the component (C), it is possible to obtain a design property different from the concavo-convex pattern of the conventional hammertone paint.

Claims (2)

[Claims] 1. A hydroxyl value of component (A) 25 to 80 mg KOH /
g, weight average molecular weight 2000 to 15000, acid value 1
50 to 9 having a hydroxyl group of 12 to 12
0% by weight and component (B) melamine resin 50 to 10% by weight
Hammertone paint based on a mixture obtained by adding 0.1 to 8.0% by weight of a component (C) vinyl polymer antifoaming agent to a resin solid component consisting of. 2. The hammertone paint according to claim 1, containing 4% by weight or less of a fluororesin powder.