JPS603349B2 - Coating composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a coating composition that provides a textured finish by baking.

A solvent solution type containing microspheres or micro hollow spheres with non-oleophilic surfaces selected from glass, ceramics, and plastics, an appropriate amount of polyhydric alcohol, and a coupling solvent for dissolving this polyhydric alcohol into a composition. Alternatively, it has been found that if a sol-type coating composition is baked and coated, the surface of the resulting coating will have a rough uneven shape. In addition, depending on the conditions such as the components, formulation, and coating thickness of the above-mentioned ribbon products,
It has been found that this composition is useful as a pattern finishing paint for various metal products, including pre-coated metals such as colored iron plates and colored aluminum, as it can produce a variety of uneven patterns ranging from delicate satin patterns to large leather patterns. It is something. The composition of the present invention usually comprises oily film-forming substances, microspheres or microspheres or hollow spheres (hereinafter abbreviated as microspheres) with non-oleophilic surfaces selected from glass, ceramics and plastics, polyhydric alcohols, It is a homogeneous dispersion whose constituent components include a solvent for the film-forming substance (a plasticizer and a diluting solvent in the case of a sol type), a coupling solvent for solubilizing the polyhydric alcohol in the solvent, a pigment, and a coating agent.

Oily film-forming substances used for this purpose include, for example, thermosetting resins such as pure or modified alkyds, oil-free alkyds, acrylics, unsaturated polyesters, epoxies, phenolics, or vinyl chloride, Examples include thermoplastic resins such as vinyl fluoride and acrylic resins. The microspheres are selected from materials such as glass, ceramics, and plastics, and their surfaces must be at least sufficiently sacrificial to be wetted by polyhydric alcohols. Since the plastic beads bound by the beads lack polarity, they have poor aggregation properties, making it impossible to obtain the desired uneven pattern.

Usually, to impart polarity to the surface of plastic microspheres, for example, one COO is added to the molecular structure of the monomer during the polymerization stage of the microspheres.
A method of polarizing the microspheres by introducing a polar group such as a dioxygen group or a 1-OH group, or a method of subjecting the surface of the microspheres to hydrophilic treatment after production is used. - Generally, inorganic microspheres made of glass, ceramics, etc. can be used without undergoing such treatment. The particle size used is in the range of 1 to 500 grains, and the optimum particle size is in the range of 5 to 300 grains. The shape of the microspheres is preferably spherical, but may be rounded particles without corners. The amount of microspheres used is in the range of 3 to 95% based on the total non-volatile content, and when the content is 3%, the uneven pattern formed becomes invisible to the naked eye and is The purpose of the invention is not achieved; on the other hand, if it exceeds 95%, aggregation of microspheres is difficult to occur, and physical properties as a coating film (e.g., film resistance, flexibility, impact resistance, etc.)
decreases. A range of 10-40% is applied to obtain a normal satin or leather pattern. Furthermore, when the microspheres are made of thermoplastics, they can be integrated with the film forming material by agglomeration, making it possible to use them at high concentrations. As the polyhydric alcohol, for example, ethylene glycol or propylene glycol is used. These polyhydric alcohols act as aggregating agents for microspheres in the drying process, and the optimal amount used varies depending on the formulation conditions of the composition, but generally it is 0.5 to 0.5 to 1.0 of the microspheres in terms of volume ratio.
2. It's about the same level as the sound. In addition, in order to dissolve a large amount of polyhydric alcohol into the composition, it is usually necessary to add an appropriate amount of a coupling solvent (a solvent that makes the film-forming substance solution or dispersion and the polyhydric alcohol compatible). Suitable materials include, for example, low-boiling alcohols such as tert-butanol, sec-butanol, and isobutanol. The above composition is prepared as a solution-type, plastisol-type or organosol-type coating material mainly containing a water-insoluble solvent, and is formed into a coating by heating and drying. The uneven pattern formation mechanism of the composition according to the present invention is as follows:
This is due to the fact that during the drying process, the microspheres gather in the direction of closest packing under the action of the polyhydric alcohol, forming groups of several to hundreds of microspheres, which are arranged on the coated surface.

The aggregation process of microspheres will be explained in more detail as follows.
That is, it is thought that the formation of the uneven pattern during baking coating of the present composition is carried out through the following process. '1} Composition application: This state is a uniform dispersion in which the polyhydric alcohol is solubilized or finely dispersed in the composition containing microspheres.

{2} Drying first evaporates the coupling solvent and liberates the polyhydric alcohol into the composition.

At this time, since the microspheres exhibit a hydrophilic surface, polyhydric alcohol is also deposited on the microspheres. This state is in the form of an unstable emulsion with polyhydric alcohol as the internal phase. '
The 3'-separated polyhydric alcohol quickly coalesces into microspheres, resulting in the assembly of microspheres.

At this time, heating destroys the dispersion of the polyhydric alcohol and promotes aggregation. '41 Fine 4. Since the aggregation of spheres proceeds in a close-packed manner, many dense aggregations are formed on the painted surface.

'5} By heating, the polyhydric alcohol evaporates, the catalyst in the microspheres is replaced by the film-forming substance, and the aggregate forms a convex shape with a strong coating surface.

(b) The above-mentioned unevenness forming process progresses in a short time in a chain manner, and according to the inventor's experiments,
It was confirmed that the process was carried out for 1 to 2 minutes in a high-temperature heating furnace at 0° C., and that a satin pattern or a leather pattern appeared.

Note that when the microspheres exhibit a lipophilic surface, coalescence with the polyhydric alcohol does not take place, and the desired uneven pattern cannot be obtained. The composition according to the present invention forms various uneven pattern coating films through heating and drying by the above-mentioned mechanism, regardless of the type of film-forming substance (thermosetting or thermoplastic) that is the main component. However, the size and shape of the pattern formed at this time mainly depend on the type of film-forming substance, material of the microspheres, specific gravity, average particle size, particle size distribution, surface hydrophilicity and amount used, and the amount of polyhydric alcohol used. It is controlled by factors such as the type and amount used, the boiling point and amount of coupling solvent used, coating film thickness, and drying conditions (temperature, time, air volume). As a general tendency, when the same film-forming substance is used and the film thickness is constant, when the amount of polyhydric alcohol and microspheres is large, when the amount of microspheres is relatively large, the specific gravity of the microspheres is small and the particles are small. A large pattern is formed when the diameter is relatively large even within the optimum range, when the surface of the microsphere exhibits strong hydrophilicity, when the boiling point of the coupling solvent is low, and when the setting time during drying is short, and vice versa. Under certain conditions, it is easy to form fine patterns. In addition, the main factors that inhibit pattern formation include the addition of substances that inhibit the movement of microspheres in the composition, such as gelling agents such as metal soap and bentonite, or the presence of large amounts of polar solvents in the composition. Cases can be mentioned. As described above, the present invention can be applied to a wide variety of known paint systems to produce various uneven pattern paints.

Therefore, unlike conventional patterned paints, special painting equipment, painting operations, and processes are not required to carry out the method of this invention. The composition according to the present invention can be applied to various coated objects such as electrical equipment, physical and chemical equipment, optical equipment, office machines, car frames,
It is possible to apply finishing coating bags with a variety of uneven patterns, from delicate satin patterns to elegant nashiza patterns, to materials such as building materials. It is also particularly useful as a pattern paint for pre-coated metals that requires high-temperature, short-time baking.This invention allows for the production of high-performance textured pattern coated steel sheets or aluminum sheets using high-temperature, high-speed painting lines that are considered difficult with the current state of the art. Mass production became possible. Next, the present invention will be explained in detail with reference to Examples.

Example 1 Composition for coating black uneven pattern Thermosetting acrylic resin (solid content 50%) 6 parts by weight Butylated melamine resin (solid content 60%) 10 Butyl carbitol acetate 10 Isobutanol 10 Secondary butanol
5 xylol
5 ethylene glycol
25 Dispersant 0
．． 3 Acrylic resin beads (particle size 20-100mm)
15 carbon black 1 total
149.3, where the volume percent of the acrylic resin beads in the total non-volatile content is 27%.

) This composition can be used for the purpose of applying satin or leather patterns to metal substrates such as electrical equipment, physical and chemical equipment, optical equipment, office machines, colored galvanized iron, and colored aluminum.

Example 2 Gray uneven pattern coating composition Oil-free alkyd resin (solid content 50%) 6 parts by weight Butylated melamine resin (solid content 60%) 10 Butyl carbitol acetate 10 Isobutanol 10 Secondary butanol
5 xylol
5 ethylene glycol
25 Dispersant 0
．． 3 Acrylic resin beads (particle size 20-100 French)
15 carbon black titanium monoxide 15 total
164.3 (Here, the percentage of dissolved acrylic resin beads in the total nonvolatile matter is 25%.
It is.

) This composition can be used as a coating for pre-coated metals such as colored galvanized iron and colored aluminum, and can coat these surfaces with a high-performance satin pattern or leather pattern coating.

Example 3 Composition for coating with black uneven pattern Thermosetting acrylic resin (solid content 50%) Satoshi weight part Butylated melamine resin (solid content 60%) 10 Butyl carbitol acetate 10 Isobutanol 10 Secondary butanol
5 xylol
5 ethylene glycol 2
5 Dispersant 0.3
Phenol resin micro hollow spheres (particle size 10-120 French, specific gravity 0.3) 5 carbon black 1 total
139.3 (here, the volume percent of the total non-volatile matter of the phenolic resin micro hollow spheres is 3
It is 0%.

) This composition can be used for the purpose of coating metal bases such as electrical equipment, physical and chemical equipment, optical equipment, office machines, etc. with a split pattern or a leather-like pattern.

Example 4 Composition for cream-colored uneven pattern coating Oil-free alkyd resin (solid content 50%) 6 parts by weight Butylated melamine resin (solid content 60%) 10 Butyl carbitol acetate 10 Isobutanol 10 Sec-butanol 5 Xylol
5-propylene glycol
25 Dispersant
0.3 acrylic resin beads (20 to 100 beads)
15 yellow iron oxide titanium dioxide 15 total
165.3 (where the volume percent of the acrylic resin beads in the total non-volatile content is 28.5%).

) This composition has been passed through coatings for coated metals such as colored galvanized iron and colored aluminum to provide high performance satin or leather pattern coatings on these surfaces.

Example 5 Gray uneven pattern coating composition Thermoplastic acrylic resin (solid content 50%) 5 boxes Parts by weight Butylbenzyl phthalate 13.5
Butyl carbitol acetate 10 Cyclohexanone 7 Diisobutyl ketone 5 Isobutanol
15 sec-butanol
8 xylol 8 ethylene glycol 25 dispersant
0.3 Acrylic resin beads (particle size 20-100) Titanium 15 oxide
20 carbon black
0.2 total
130 (where the volume percent of the acrylic resin beads in the total non-volatile content is 32.4%).

) This composition can be used to coat metal substrates such as automobiles, kitchen utensils, toys, etc. with satin-like or leather-like patterns.

Example 6 Vinyl chloride resin powder for green uneven pattern coating composition base 5 parts by weight of dioctyl sebacate 12 dioctyl adibate 8 butyl carbitol acetate 18 diisobutyl ketone
18 isobutanol
18 sec-butanol
10xylol 9 ethylene glycol 35 dispersant
0.5 glass beads (particle size 5-60 French) 48 phthalocyanine green 8 titanium oxide
10 calcium carbonate
1 dibasic lead phosphate
1.

5 total 247 (
Here, the volume percent of the glass beads in the total non-volatile matter is 23.5.

) This composition can be used as a paint for colored steel sheets suitable for molding, and can provide high-performance satin-like or leather-like coatings on their surfaces.

Claims (1)

[Claims] 1. An oil-based film-forming substance, microspheres or micro-hollow spheres with a non-oleophilic surface selected from glass, ceramics, and plastics with a content of 3 to 95% based on the total non-volatile content as an unevenness-forming material; A solvent solution type or sol type coating composition comprising an appropriate amount of a polyhydric alcohol as an aggregating agent for an unevenness forming material and a coupling solvent for dissolving the polyhydric alcohol in the composition.