KR101365577B1 - Paint composite for glass printed silk screen and its manufacturing method - Google Patents

Abstract

The present invention is a thixotropy (thixotropy), leveling, anti-foaming and adhesion is a good coating composition that can have a strong adhesion and a clean coating surface without bubbles or cratering on the glass silk screen printing surface And to a method for producing the same.
The manufacturing method of the present invention,
I) 45 to 60% by weight of colored pigment, 0.2 to 2.0% by weight of dispersant, and 20.0 to 40.0% by weight of acrylic resin (based on solids) are mixed with 5 to 15% by weight of aromatic hydrocarbon solvent, followed by milling and milling to a particle size of 10 μm or less. Preparing a mill base; And
Ii) 40 to 70% by weight of the mill base, 3 to 6% by weight of an aromatic hydrocarbon solvent or a polyhydric alcohol derivative solvent, 10 to 30% by weight of acrylic resin (based on solids), 5 to 15% by weight of melamine resin (based on solids), 5-15% by weight of epoxy resin (based on solids), 1-2% by weight of alcohol solvent, 0.1-1.0% by weight of fluidity regulator (based on solids), 0.1-3.0% by weight of adhesion improving agent, 0.1-1.0% by weight of surface control agent, quenching Mixing 3 to 10% by weight.

Description

Paint composition for coating after silkscreen printing on glass material and its manufacturing method {Paint composite for glass printed silk screen and its manufacturing method}

The present invention is a thixotropy (thixotropy), leveling, anti-foaming and adhesion is a good coating composition that can have a strong adhesion and a clean coating surface without bubbles or cratering on the glass silk screen printing surface And to a method for producing the same.

In the case of the glass screen paint for silk screen top coats used up to now, the silicone component remaining in the silk screen print coating has caused the occurrence of cratering and deterioration of adhesion during top coat.

In order to solve this problem, additives containing a specific silicone component were used, but the cratering was not completely solved, and the cratering occurred more severely when used excessively to solve the problem. There was. In addition, due to the use of silicone preparation, there is also a problem of poor adhesion during repainting.

Furthermore, in order to improve the hiding power, the thickness of the coating film is also increased. In this case, since bubbles are generated, this problem must be solved along with the cratering.

An object of the present invention is to provide a coating composition and a method for producing the same, which not only solve the above problems, that is, the problem of occurrence of anti-foaming and cratering, but also of good repainting.

The present invention is a method for producing a coating composition as described above,

I) 45 to 60% by weight of colored pigment, 0.2 to 2.0% by weight of dispersant, and 23.0 to 40.0% by weight of acrylic resin (based on solids) are mixed with 5 to 15% by weight of aromatic hydrocarbon solvent, followed by milling and milling to a particle size of 10 μm or less. Preparing a mill base; And

Ii) 40 to 70% by weight of the mill base, 3 to 6% by weight of an aromatic hydrocarbon solvent or a polyhydric alcohol derivative solvent, 10 to 30% by weight of acrylic resin (based on solids), 5 to 15% by weight of melamine resin (based on solids), 5-15% by weight of epoxy resin (based on solids), 1-2% by weight of alcohol solvent, 0.1-1.0% by weight of fluidity regulator (based on solids), 0.1-3.0% by weight of adhesion improving agent, 0.1-1.0% by weight of surface control agent, quenching Characterized in that it comprises the step of mixing 3 to 10% by weight.

At this time, the fluidity regulator is characterized in that the modified urea.

In addition, the adhesion improving agent is characterized in that the silane compound.

In addition, the surface modifier is characterized in that any one of polyether-modified polydimethylsiloxane and polyacrylate.

In addition, the quencher is characterized in that talc (Talc).

Hereinafter, the components constituting the silkscreen coating composition of the present invention will be described. The unit is weight%.

First, the aromatic hydrocarbon solvent used in the millbase manufacturing process serves as a lubricant to mix the pigments, resins and various raw materials in the process of dispersing the pigment, and is added to maintain the viscosity suitable for dispersion.

Colored pigments are milled around 6-8 passes at a temperature of 35 ℃ -45 ℃ with Dyno mill, so the particle size distribution is 10μm for inorganic pigment and 5μm or less for organic pigment. The content is preferably 45 to 60% by weight of the mill base.

The colored pigment used for this invention may be either a commercially available organic pigment or an inorganic pigment. The present inventors used organic red, white (CI PIGMENT RED 170, CI PIGMENT WHITE 6), etc. in the course of the experiment, but is not limited thereto.

The resin imparts the adhesion, drying properties, physical and chemical properties, and pigment sedimentation prevention functions of the paint composition, and acrylic resins, melamine resins, and epoxy resins may be appropriately mixed. Since the resin is in a liquid state, it is used by mixing using a stirrer at room temperature.

The content of the resin on the mill base is preferably 23.0 to 40.0% by weight of the total mill base, and the total resin content is preferably 29.2 to 88% by weight in the final coating composition. If the resin content is less than 29.2% by weight may cause a problem in the adhesion with the material, if it exceeds 88% by weight may lead to a decrease in storage stability due to the viscosity increase.

Dispersants may use polymeric wet dispersants. This function increases the raw material dispersibility of each component, and it is preferable to use 0.2 to 2.0% by weight of the mill base. If it is less than 0.2% by weight, there is a problem in pigment dispersion. However, it may cause problems such as drying in the final paint production.

The alcohol-based solvent included in the second process is used as an additive for improving product performance rather than a solvent.

In addition, the solvent contained in 3 to 6% by weight lowers the viscosity to facilitate the mixing of the mill base, various resins and raw materials, and also serves as a lubricant. Such a solvent can use an aromatic hydrocarbon solvent or a polyhydric alcohol derivative solvent. When the content of the solvent is too low, the viscosity of the composition is high, there is a problem in dispersion and workability, even if too high, the viscosity of the composition is low, may cause problems in pigment settling and dispersibility.

Fluidity regulator prevents free movement of paint after painting to prevent cracking of coating film due to change of foreign matter or surface tension, and prevents popping due to rapid temperature rise when heated and dried with unique flexibility. It gives storage stability of paint. The rheology control agent usable in the present invention is a modified urea solution.

In the case of the modified urea solution, less than 0.1% by weight (based on solids) may cause problems of cratering and foaming. If the content exceeds 1.0% by weight (solid content basis), problems such as storage stability may occur, and the surface of the coating may be deteriorated.

Adhesion enhancers help the adhesion between inorganic and glass materials. Basically, the coating does not appear on the glass, but using an adhesion improving agent improves the adhesion between the coating and the glass. The adhesive force improving agent used in the present invention uses a silane compound.

Surface modifiers improve material wettability very effectively. It also improves leveling and gloss, imparts a long wave effect and prevents cratering. The surface modifier used in the present invention may be used by selecting at least one of polyether-modified polydimethylsiloxane and polyacrylate. The surface control agent is preferably used 0.1 to 1.0% by weight of the total coating composition, when used in less than 0.1% by weight of the paint has a problem such as a high level of surface tension, and when used in excess of 1.0% by weight surface tension is too low When repainting, there is a problem of poor interlayer adhesion.

The matting agent not only increases the adaptability to fish eye phenomenon or cratering due to dust and fine dust generated during spraying, but also suppresses bubble generation. The matting agent used in the present invention may use a talc (Talc, Mg ₃ Si ₄ O ₁₀ (OH) ₂ ) system. It is preferable to use 3 to 10% by weight of the matting agent, but when used in less than 3% by weight, cratering and bubbles are generated due to fluidity problems. When used in excess of 10% by weight, a problem arises that the appearance surface is bad.

Silkscreen top coat of the present invention is excellent in adhesion, anti-foaming, leveling properties, not only excellent coating performance, appearance and adhesion to the raw material (glass), but also poor adhesion, cracking occurs on the silk-screen coating surface There is almost no problem.

When painting the general paint on the silk-screen coating surface, the cratering problem occurs, and when the coating film is a thick film (40 microns or more), even bubbles (popping) occurs. On the other hand, in the case of the paint according to the present invention, this problem was simultaneously improved by controlling the flow control agent and the quencher amount. Therefore, when coated on not only the raw material (glass) surface but also the silkscreen coating surface, it satisfies the adhesiveness, leveling property (no cracking) and antifoaming at the same time.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense. Details that are not described herein will be omitted since those skilled in the art can sufficiently infer technically.

≪ Example 1 >

50% by weight of pigment pigment (CI PIGMENT WHITE 6), 2.0% by weight of polymer dispersant (BYK-P104S), 35% by weight of acrylic resin (based on solids), 13% by weight of aromatic hydrocarbon solvent XYLENE, and then Dyno 6 to 8 pass milling (milling) to the mill was prepared so that the particle size distribution is less than 10μm.

40.7% by weight of mill base prepared as described above, 4.4% by weight of aromatic hydrocarbon solvent XYLENE, 20.4% by weight of acrylic resin (based on solids), 13.5% by weight of melamine resin (based on solids), epoxy resin (based on solids) 13.5% by weight, 1.4% by weight of n-BuOH, 0.3% by weight of modified urea urethane (based on solids), 1.4% by weight of silane-based compound (γ-Glycidoxypropyl trimethoxysilane / trade name Silquest A-187), polyacrylate 0.4 wt% and 4 wt% of Talc were mixed and stirred to prepare a coating composition of the present invention.

≪ Comparative Example 1 &

50% by weight of pigment pigment (CI PIGMENT WHITE 6), 1.0% by weight of polymer dispersant (BYK-P104S), 44% by weight of acrylic resin (based on solids), 5% by weight of XYLENE, and then mixed with Dyno Mill 6-8 By milling the pass degree was prepared so that the particle size distribution is less than 10μm.

The mill base (mill base) 40.5% by weight as prepared above, XYLENE 4.3% by weight, 20.2% by weight of acrylic resin (solid content basis), the melamine resin (solid basis) 13.4% by weight, 13.4% by weight of an epoxy resin (based on solids), 1.4 weight% of n-BuOH, 1.4 weight% of silane, 1.4 weight% of silicone type (polyether modified polydimethylsiloxane / brand name BYK-306, polyester modified polydimethylsiloxane / brand name BYK-310), Talc 4 weight%, By stirring, the coating composition of Comparative Example 1 was prepared.

The surface control agent content included in the final coating composition is silicone-based silicone system (polyether modified polydimethylsiloxane / trade name BYK-306, polyester modified polydimethylsiloxane / brand name BYK-310) 1.4 wt% silane 1.4 wt%, Talc 4 wt% %to be.

Comparative Example 2

50% by weight of pigment pigment (CI PIGMENT WHITE 6), 2.0% by weight of polymer dispersant (BYK-P104S), 35% by weight of acrylic resin (based on solid content) (construction chemistry), 13 minutes by weight of XYLENE, and then Dyno Mill 6 to 8 pass milling (milling) to produce a particle size distribution is less than 10μm.

Mill base prepared as described above 39.2% by weight, XYLENE 4.3% by weight, acrylic resin (solid content) 19.5% by weight , melamine resin (solid content) 13% by weight, epoxy resin (solid content) 13% by weight, 1.5 wt% of n-BuOH, 4.6 wt% of polyamide wax, 0.6 wt% of silane, 0.4 wt% of polyacrylate, and 3.9 wt% of Talc were mixed and stirred to form a coating composition of the present invention.

The polyamide-based fluidity regulator content included in the final coating composition is 4.6 wt%, 0.6 wt% silane and 3.9 wt% Talc.

Test Example 1: Leveling Evaluation

After silk printing with silkscreen ink on a 15 cm wide and 15 cm long glass plate, the film was dried at 180 ° C. for 10 minutes and then sprayed onto a coating film, and then dried for 10 minutes, and then dried at 160 ° C. for 20 minutes for visual observation.

When the coating material of Comparative Example 1 was coated and dried on the silkscreen coating surface under the same conditions, the surface was smooth but the cratering occurred. In Comparative Example 2, smoothness was also deteriorated and cratering also occurred.

<Test Example 2: Evaluation of antifoaming>

In order to confirm the anti-foaming of the Examples and Comparative Examples 1 and 2, after printing silkscreen with a silk screen ink on a glass plate 15 cm wide, 15 cm long and then dried 180 ° C X 10 minutes, the Example, Comparative Example 1, Comparative Example 2 After coating, the coating was set for 10 minutes, dried at 160 ° C. for 20 minutes, and visually evaluated.

When the paint of Comparative Example 1 is coated and dried on the silk-screen coating surface under the same conditions, there is a small amount of bubble generation. In Comparative Example 2, there was no foaming, but the cratering partially occurred as shown in Test Example 1. The example was good without bubbles.

Test Example 3: Evaluation of Dispersibility and Storage Stability

In order to confirm the dispersibility and storage stability of the liquid paint prepared in Example, the degree of pigment precipitation that appears when placed in a 500 ml can for one week in a 60 ° C constant temperature room was evaluated. Caking) was also observed.

In Comparative Example 1, pigment precipitation occurred when left in a 60 ° C. constant temperature room for one week, but in the case of the paint prepared in Example and Comparative Example 2, when pigment was left in a 60 ° C. constant temperature room for 1 week, No precipitation occurred.

In addition, 10 wt% of a 60 μm pearl pigment was added to the paint instead of the pigment described above, and Example 1 and Comparative Example 2 were simultaneously left in a 60 ° C. constant temperature room for 1 week. As a result of observing the storage state after Comparative Example 1, pigment precipitation close to hard caking occurred, but in Example and Comparative Example 2, precipitation corresponding to soft caking occurred. That is, Example and Comparative Example 2 were found to have good dispersibility and storage stability.

< Test Example  4 : Repaintable >

In order to confirm the repaintability of the Examples and Comparative Examples 1 and 2, after coating the coating composition of Example, Comparative Example 1, Comparative Example 2 on a glass plate 15 cm long and 15 cm long, respectively, setting 10 minutes, 160 ℃ X 20 minutes Dried. Next Example coating composition on the coating surface, Comparative Example 1 on the coating surface Comparative Example 1 coating composition, Comparative Example 2 on the coating surface Comparative Example 2 coating composition on the 10 minutes setting, 160 ℃ X 20 minutes to dry and then the adhesion The test was conducted.

In Comparative Example 1, an adhesion failure test resulted in interlayer adhesion failure, but not in Example and Comparative Example 2. That is, Example and Comparative Example 2 was found to be excellent in repainting.

<Evaluation>

In Comparative Example 1, the leveling and the anti-crettering effect was slightly improved by using a silicone-based surface agent, while the popping phenomenon and the poor repaintability occurred. Therefore, in the embodiment, polyacrylate and modified urea fluidity regulators are used instead of the silicone-based surface agent to completely realize leveling (film smoothness) and anti-cuttering effects, as well as popping due to excessive use of the silicone-based surface agent. The phenomenon of boiling and repainting is significantly improved, and the storage safety is greatly improved.

In Comparative Example 2, instead of the modified urea rheology control agent used in the example, polyamide amide rheology control agent was used. In this case, the recoating property and the storage safety were good, but the leveling (film smoothness) and the anti-cuttering effect were remarkable compared to the example. It was bad.

In summary, paints coated on silk-screened surfaces should have excellent leveling and film-preventing effects. To do this, we usually use a silicone based surface agent. However, this will cause popping and poor repainting problems. Therefore, in order to solve the problem, the present inventors have simultaneously implemented the anti-cretering effect and the recoating property by using the property of inhibiting the paint fluidity and movement of the modified urea fluidity regulator, and the leveling (film smoothness) caused by the use of the modified urea fluidity regulator. The defect problem was solved by using acrylate, and the acrylate was also remarkably improved in terms of repaintability since it is much better in repaintability than silicon.

In the case of the rheology control agent, the polyamide type that is generally used was also used, but the anti-createring effect was significantly lower than that of the modified urea rheology control agent. Therefore, the biggest feature of the present invention is to improve the cruttering, popping, and repainting defects generated during the coating of the paint on the silkscreen coating surface at the same time by using the modified urea fluidity regulator, and the storage stability of the coating is greatly improved by the side effect. It is a point.

As described above, the present invention is prepared by controlling the content of the flow control agent and the surface control agent to effectively improve the problems of repainting, foaming, and cratering in the existing silkscreen coatings, as well as the existing paints. By further improving the sedimentation problem of pigments (including pearls and aluminum), it is possible to provide better silkscreen coatings.

Claims (6)

I) 45 to 60% by weight of colored pigment, 0.2 to 2.0% by weight of dispersant, and 23.0 to 40.0% by weight of acrylic resin (based on solids) are mixed with 5 to 15% by weight of aromatic hydrocarbon solvent, followed by milling and milling to a particle size of 10 μm or less. Preparing a mill base; And
Ii) 40 to 70% by weight of the mill base, 3 to 6% by weight of an aromatic hydrocarbon solvent or a polyhydric alcohol derivative solvent, 10 to 30% by weight of acrylic resin (based on solids), 5 to 15% by weight of melamine resin (based on solids), 5-15% by weight of epoxy resin (based on solids), 1-2% by weight of alcohol solvent, 0.1-1.0% by weight of fluidity regulator (based on solids), 0.1-3.0% by weight of adhesion improving agent, 0.1-1.0% by weight of surface control agent, quenching Mixing 3 to 10% by weight;
Method for producing a coating composition to be coated after the silk screen printing operation on the glass material. The method of claim 1,
Flow regulators, characterized in that the modified urea,
Method for producing a coating composition to be coated after the silk screen printing operation on the glass material. The method of claim 1,
An adhesion improving agent is a silane compound,
Method for producing a coating composition to be coated after the silk screen printing operation on the glass material. The method of claim 1,
Surface control agent, characterized in that any one of polyether-modified polydimethylsiloxane and polyacrylate,
Method for producing a coating composition to be coated after the silk screen printing operation on the glass material. The method of claim 1,
The quencher is characterized in that talc (Talc),
Method for producing a coating composition to be coated after the silk screen printing operation on the glass material. A coating composition prepared by the method of any one of claims 1 to 5, which is coated after the silkscreen printing operation on the glass material.