KR20010060096A - Coating compositions of automotive refinish color basecoat for 1K room temperature curing condition - Google Patents

Abstract

PURPOSE: A one-liquid type colored paint composition for repairing vehicles is provided which has excellent external appearance, improved workability, adhesion, water-proof property and metallic aligning property. CONSTITUTION: The one-liquid type colored paint composition for repairing a car comprises: (i) 5-50 wt.% of one-liquid type acryl polyol resin having a solid powder content of 30-70 wt.%; (ii) 5-20 wt.% of butylated melamine resin having a solid powder content of 30-70 wt.% as a cross-linking agent; (iii) 15-50 wt.% of cellulose ester; (iv) 5-30 wt.% of polyester resin; (v) 2-5 wt.% of dispersing agent; (vi) 10-40 wt.% of quick-drying solvent; (vii) 3-10 wt.% of wax; (viii) 1-30 wt.% of paint; (ix) 0.05-2 wt.% of silicone leveling agent; and (x) 0.05-5 wt.% of adhesion accelerator.

Description

Coating composition of automotive refinish color basecoat for 1K room temperature curing condition}

The present invention relates to a one-component automotive repair colored paint composition, and more particularly to a automotive repair colored paint composition, which is composed of butyl acrylate, styrene and butyl methacrylate monomers in a conventional colored paint composition. In addition, acrylic polyol resin in a one-component room temperature dry form having a solid content of 30 to 70% by weight and butylated melamine resin are contained, so that the appearance and workability, adhesion, water resistance, and metallic orientation are superior to conventional repair coating compositions. The present invention relates to an improved one-component automotive repair colored paint composition.

As high industrialization took place in the twentieth century, humans were provided with many benefits to real life, and the foremost of such benefits is the car we ride on. As vehicles are currently being sold, the importance of appearance is being raised with technological growth, and excellent automotive paints are being developed to meet the principle of supply according to demand.

The country's automobile production increased more than 20 times from 1980 to 1995, and the average annual growth rate during the same period was 22.6%, showing a unique growth rate compared to other major automobile producing countries. Our country has emerged as the world's fifth largest automobile producer based on the number of automobiles produced in 1995. At present, the number of automobiles in our country is more than 10 million, and it is expected to hold about 20 million in 2009. This market situation contributes to the rapid growth of the automotive repair paint market. In particular, the increase in national income has led to the expansion of sales of mid- and large-sized luxury cars, and the high quality demands of consumers have led to the enhancement of automotive refinish paints. The one-component lacquer type, which was used as a conventional automotive refinish colored topcoat, has been replaced by a two-component urethane paint. Currently, a one-component, room temperature drying colored paint that focuses on workability of the operator is mainly used.

The one-component room temperature drying type automotive repair colored paint (2C1B) has a somewhat poor physical properties compared to the automotive colored paint (2C2B) that is painted while the automobile is produced. These physical properties are known to occur due to the lack of proper crosslinking with the main body because the color is naturally dried at room temperature. Such a state may act as a very poor factor in interlayer adhesion and water resistance, cold resistance chipping resistance, impact resistance, solvent resistance and chemical resistance, and may cause a decrease in durability of the paint. In addition, when a resin having a relatively high molecular weight and a raw material corresponding thereto are applied, it may cause a decrease in physical properties.

Therefore, the automotive paint composition should consider the stability and convenience, appearance and basic physical properties of the overall operator. In particular, the interlayer adhesion relationship between electrodeposition, undercoat, and topcoat is very important as a paint for system coating, and this intermediate role is an important part in terms of physical properties as well as appearance.

Accordingly, the present invention is a conventional low-molecular weight acrylic polyol resin and cellulose composed of butyl acrylate, styrene and methacrylate monomers in a conventional colored paint composition in order to solve the problems of the above-mentioned useful automotive repair colored paints Using a small amount of excellent butylated melamine crosslinking agent that forms crosslinking with medium and top transparent as a basic raw material selected from esters, soft polyester resin and excellent film forming ability to reduce rigidity and prevent flow And using a cellulose ester for proper dispersibility of the pigment, and applying a suitable wax to reduce problems such as metallic stains and dichroic differences, which are problematic when applying the metallic pigment, and a suitable quick-drying solvent system and other additives. Work by applying Been found that the grant, adhesiveness, water resistance, beautiful appearance, orientation of the metallic pigments thereby completing the present invention.

Therefore, the present invention is based on the acrylic polyol resin, polyester resin, melamine resin, cellulose ester and other additives to the color coating composition to excellent workability, appearance, wettability between the system coating film, adhesion, water resistance, metallic stain The purpose of the present invention is to provide an oil-soluble one-component room temperature dry type automotive repair colored paint composition having improved general properties such as dichroic tea.

The present invention is a one-component automotive repair colored paint composition,

5 to 50% by weight of a one-component acrylic polyol resin having a solid content of 30 to 70% by weight; 5 to 20% by weight of a butylated melamine resin having a solid content of 30 to 70% by weight as a crosslinking agent; 15-50% by weight of cellulose ester, 5-30% by weight of polyester resin, 2-5% by weight of dispersant, 10-40% by weight of quick-drying solvent, 3-10% by weight of wax, 1-30% by weight of pigment, silicone leveling agent It is characterized by the one-component automotive repair colored paint composition which contains 0.05-2 weight% and 0.05-5 weight% of adhesion promoters.

The present invention will be described in more detail as follows.

The present invention is to provide a new raw material to the existing repair color coating composition in order to improve the workability and appearance, adhesion, water resistance, cold resistance chip resistance, impact resistance, etc. of the one-component oil-soluble automotive repair color coating composition applied in the prior art Use the graft method.

In the colored coating composition of the present invention, a one-component acrylic polyol resin having a solid content of 30 to 70 wt% in the resin is used as a main component. In particular, the monomers constituting the one-component acrylic polyol resin are butyl acrylate, styrene, and butyl methacrylate. In the present invention, excellent gloss and appearance can be obtained by appropriately combining the molecular weight, chemical composition, and structure of the monomer. In addition to this, it is possible to enhance the adhesiveness with the intermediate, the wettability and adhesion of the transparent coating, the water resistance and the wettability of the pigment. Therefore, in the present invention, by using the one-component acrylic polyol resin at 5 to 50% by weight based on the total color paint composition, it improves the adhesion and overall physical properties of the coating composition, the coating film if the content is less than the above range There is a problem that various physical properties such as formation ability and adhesion, water resistance and the like is poor, while there is a problem that the cold resistance chipping resistance and impact resistance of the coating film is poor when exceeding the above range.

In addition, the present invention is characterized by using a butylated melamine resin having a solid content of 30 to 70% by weight in the colored paint composition, which is composed of isobutyl alcohol, formalin and melamine, etc. It can induce the improvement of adhesion and workability, cold resistance chipping resistance, impact resistance and the like. In particular, the conventional one-component automotive repair colored paints have not applied melamine resins, but exhibited many problems in appearance and storage stability even when applied to physical properties. However, the butylated melamine resins used in the present invention have their chemical structures, respectively. It contains three nitrogen groups in which two molecular chains exist, and since the molecular chain is composed of four hydrocarbons containing one oxygen, it does not easily react at room temperature, and crosslinks at 60 to 80 ° C. or more. It is more preferable in terms of storage stability. At this time, when the top coat transparent coating of the automotive repair colored paint, it is necessary to bake at 60 ℃ or more conditions, it is determined that it will help to crosslink the coating film under such conditions. In addition, in the present invention, a suitable dosage of the butylated melamine resin is very important above all, and the use of a suitable form of melamine is also a part that cannot be ignored. In the case of the conventionally used methylated melamine resin, the activation group can be easily separated and crosslinked, but because of the relatively fast reaction, it cannot be applied in terms of storage stability, but in the case of the butylated melamine resin used in the present invention, In addition, it has a relatively slow activation reaction and can be used more suitably. In addition, in general, when the melamine resin is applied, an acid catalyst is applied for a quick reaction, but in the present invention, there is a feature of not applying such an acid catalyst, and a relatively fast chemical reaction lowers the storage state of the paint, and in many ways 1 It is because it is unsuitable for liquid coating.

Therefore, the butylated melamine resin used in the present invention is used in an amount of 5 to 20% by weight based on the total color paint composition, and can significantly improve the physical performance of the coating film. At this time, if the use content is less than the above range it is difficult to improve the physical properties of the coating film, when exceeding the above range causes a problem in heat storage stability to promote the gelation of the paint.

In addition, the present invention uses a low molecular weight cellulose ester having a molecular weight of 18,000 to 20,000 in the colored coating composition, which has excellent ability to form a coating film, dispersion of pigments, suitable flowability, prevention of dripping and cratering, and rapid coating. For drying, stability control of metallic pigments, enhancement of interlayer adhesion, and the like. The cellulose ester is an important raw material used in automotive paints because it has an effect of enhancing the orientation of mica and pearls applied to metallic paints. The cellulose ester used in the present invention is a relatively low molecular weight form that can be applied to high sloid paints, and is soluble in alcohol. The shape is composed of a powder of 100% solids, it is preferable to prepare a solid content of 10 to 40% by weight using a solvent such as butyl acetate or acetate ether.

The cellulose ester used in the present invention is used in an amount of 15 to 50% by weight based on the total coating composition, and can improve physical properties of the coating film, dispersion of the pigment, and orientation of the metallic pigment. At this time, if the use content is less than the above range, there is a problem that the physical properties of the coating film is lowered, and when it exceeds the above range, the hardness of the coating film is greatly increased, and thus the coating film is easily broken.

In addition, in the present invention, to lower the hardness of the coating film in the coating composition, to prevent it from flowing down, and to be easily painted on the bent portion, the solid content is 30 to 70% by weight and a component capable of preventing the paint from flowing down (SCA: Sagging). The polyester resin of the form (control agent containing 4-5 weight% or 2-3 weight% of urethane functional groups) is contained suitably is used. The coating film composed of acrylic polyol and melamine resin, cellulose ester, etc. contained in the coating composition mentioned above may exhibit a phenomenon that the coating film is easily broken even in light impact due to its high hardness, and it is necessary to use a polyester resin to compensate for this. Therefore, the use of the polyester resin may improve flowability and anti-dripping of the coating composition, orientation of the metallic pigment particles, flexibility, and the like.

The polyester resin used in the present invention is used in 5 to 30% by weight based on the total coating composition, if the content is less than the above range can increase the hardness of the coating film to give poor impact resistance and water resistance, the range If exceeded, flowability and dripping of the coating film can be better maintained, but poor results can be obtained in the appearance and gloss of the coating film and other physical properties.

In addition, the present invention uses a dispersant in the coating composition, where carbon black has a very low specific gravity and a very large surface area, so that dispersibility and storage stability cannot be easily obtained without a perfect dispersing system. Choice is essential. Therefore, in the present invention, a component in the form of a conventional block copolymer made of long chain (acrylic polyester copolymer) having a pigment affinity group such as an acrylic polyester polymer is used as a dispersant for the pigment. In particular, the dispersant has a solid content of 30 to 60% by weight and is structurally different from existing dispersants, and is a special dispersant that hardly causes pigment aggregation in winter, and promotes dispersibility and storage stability of the pigment. can do. In the present invention, the dispersant is used in an amount of 2 to 5% by weight based on the total coating composition. If the content is less than the above range, the dispersibility of the pigment is poor, which may affect the appearance, storage stability, color intensity, and the like of the paint. If it exceeds the above range, it may affect the water resistance of the coating film.

In addition, the present invention is characterized by the use of a relatively fast drying solvent (hereinafter referred to as " fast drying solvent ") contained within a suitable dissolution parameter range as a solvent capable of imparting suitable boiling point and rheological properties to the coating composition. have. In other words, when a slow drying solvent (hereinafter referred to as a "dry solvent") is applied in terms of rheological properties, it may cause a problem in workability due to the slow drying of a one-component colored top coat, and also a metallic pigment, pearl, mica, etc. It is possible to use a quick-drying solvent because it may cause problems in the orientation fluidity of the.

The fast-drying solvent used in the present invention uses a conventional one similar to the general solvent form, which is used in 10 to 40% by weight based on the total coating composition. Examples of such solvents are butyl acetate, xylene, toluene and the like. At this time, when the content is less than 10% by weight, it is impossible to impart pigment fusion and rheological properties to the coating film. When the content is more than 40% by weight, the drying speed of the coating film is somewhat slow, and an inefficient coating film is formed and the VOC emission amount is the most important area. This increasing problem occurs.

In addition, the pigment component used in the colored paint composition of the present invention may be used conventional inorganic pigments, organic pigments, metallic pigments (pearl, mica), etc., and may affect the hiding and glossiness, blackness, etc. of the coating film. have. Such pigments vary depending on the composition of inorganic and organic pigments and metallic pigments, and their application amount is also used in an amount of 1 to 30% by weight, depending on the pigment. At this time, the use of less than the above range may cause problems in terms of appearance, such as hiding power and gloss, and when exceeding the above range may be a factor to lower the dispersibility and storage stability, the basic physical properties of the paint.

In addition, in the present invention, in order to enhance the leveling and wettability of the coating film, the wettability of the top transparent, the appearance, and the like, a silicone leveling agent having a structure of the polyether modified polydimethyl siloxane is used. It is known that silicon having unique characteristics can be obtained by changing the length of the silicon molecular chain. Small molecular weight silicones have good compatibility with paint systems and exhibit typical silicone properties such as reduced surface tension and improved spreadability, while large molecular weight silicones may exhibit crater phenomena, such as the Hamaton effect, due to incompatibility with paints. have. In order to avoid the crater phenomenon, a method of attaching molecular chains to silicon is mainly applied, and this form is applied to paints. The most common is polyether-modified polydimethylsiloxanes, which can modify the silicone chain by controlling the number of various organics and the side chains. In addition, it is possible to make excellent compatibility in this way, and to adjust the proportion of the polyether group to control the degree of compatibility, such modification may affect the surface tension of the paint. In addition, the polyether molecule side chain itself can be changed, and the polarity of the silicon structure can be controlled. Polyether chains consist of ethylene oxide and propylene oxide, polyethylene oxide is hydrophilic (polar), and polypropylene oxide is hydrophobic (nonpolar).

The silicone leveling agent used in the present invention has a solids content of 90% by weight or more, and is composed of polypropylene oxide groups, so that it is chemically non-polar and thus is suitable for solvent type paints. The silicone leveling agent used in the present invention is used in the amount of 0.05 to 2% by weight based on the total coating composition, if the use content is less than the above range, the effect is reduced, the effect of a suitable leveling agent can not be exerted, the excess than the above range When used, it can give an effect of relatively poor adhesion with the top transparency.

In the present invention, in order to adjust the proper orientation of the metallic pigment in the coating composition, it is selected and used among ethylene vinyl acetate copolymerized wax and ethyl acrylic acid copolymer wax having a solid content of 1.5 to 4.7% by weight. The wax used in the present invention improves the orientation and spraying ability of aluminum, mica, pearl and the like, and has an effect of reducing Bernard cell, mortling, and the like. In addition, it prevents the flip-flop effect and sedimentation that may occur during the storage of the paint, and also gives the effect of maintaining the leveling of the top transparent.

In the present invention, the silicone leveling agent is used in an amount of 3 to 10% by weight based on the total coating composition, in which the use amount is less than the above range and the wax is not obtained, and when the excess is applied in excess of the above range, The adhesion of the transparent can be very poor.

In addition, in the present invention, in order to give adhesion effect to the coating composition, as a highly reactive silane type polymer, epoxy silane having an epoxy functional group is composed of 50 to 100% by weight, preferably 50 to 70% by weight. Silane-based compounds are used as adhesion promoters. The adhesion promoter used in the present invention has a chemical structure of silane to facilitate adhesion between different layers, and is also known to be excellent in storage stability.

Therefore, in the present invention, the silane-based compound is used in an amount of 0.5 to 5% by weight based on the total coating composition, and if the content is less than the above range, the effect is reduced, so that the proper adhesion ability cannot be exerted. Can cause problems with relative storage stability.

Colored paint composition for automobile repair of the present invention composed of the above components has the following effects.

First, the coating composition of the present invention is a one-component room temperature dry type oil-soluble automotive repair paint, which is fast drying and does not affect the appearance and other physical properties. Secondly, it is a system that has one-component melamine resin to improve adhesion and top coat wettability, and there is no problem of paint gelation in storage stability. Third, by applying an adhesion promoter, it is possible to solve the problem of poor adhesion and water resistance, which has been pointed out as a problem of existing automobile repair paints, and exhibits good adhesion performance even in medium and top coats with poor adhesion. Fourth, it is possible to easily disperse low specific gravity pigments such as carbon black by applying a distinctive polymer type dispersant. The optimum dispersing effect is judged to be achieved by adjusting the chemical composition and structure of the dispersant, the solvent and the resin. Fifth, by applying a suitable wax, cellulose ester, polyester resin, etc., it is possible to minimize the metallic stain and appearance problems that are pointed out as a problem when applying metallic pigment, pearl, mica. Sixth, it is possible to control the appropriate volatilization time and the orientation of the metallic pigment by applying a quick-drying solvent, and by applying a suitable silicone leveling agent can improve the appearance of the coating film and the wettability of the top coat transparent.

Hereinafter, the present invention will be described in more detail with reference to the following Examples, which are not intended to limit the present invention.

Examples 1-3

Next, the solid color coating composition was prepared by applying carbon black, titanium dioxide, and aluminum metallic pigment as pigments in the same composition and content as in Tables 1 and 2.

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1) Acrylic polyol resin: One-component solvent resin (R5672, KCC) to which butyl acrylate, styrene and butyl methacrylate are applied.

2) Solvents: Butyl acetate and xylene.

3) Dispersant: Polymer block copolymer with pigment affinity group (Solsperse 32550, Avecia).

4) Carbon Black: FW-200, Degussa

5) Titanium Dioxide: CR-97, Ishihara

6) Cellulose ester: cellulose butyrate acetate (CAB, Eastman).

7) Melamine resin: Melamine resin (R4251, Koryo Chemical Co., Ltd.) to which isobutyl alcohol, " formalin, " melamine "

8) Polyester resin: Polyester resin in the form of SCA (Setal 90173 SS-50, Akzo Nobel).

9) Silicone leveling agent: Polyether-modified-polydimethylsiloxane structure (BYK-331, BYK).

10) Adhesion Promoter: Highly reactive silane form (Worlee Add 322, Worlee).

As shown in Table 1, the coating composition to which acrylic polyol resin, melamine resin, etc., having excellent gloss and adhesion performance, was applied, was able to prepare a paint having excellent spray workability and appearance, adhesion, water resistance, and the like, compared to the existing products. . Suitable polymeric dispersants can be suitably applied to low specific gravity pigments, such as carbon black, to achieve stable dispersibility and storage stability. In terms of the rheology of the solvent, a relatively low boiling point solvent was applied to solve the problem of slow drying, which is a disadvantage of the one-part paint, and improved workability. The surface tension of the acrylic polyol resin was increased, and the wettability of the top coat was improved, and melamine was also found to help this effect. Suitable polyester resins have contributed to the flexibility and softness of the coating film, and also have the effect of preventing the paint from flowing down. The silicone leveling agent helped the beautiful appearance and gloss, and gave the clear coating after the top coat. In the case of adhesion enhancer, it improved the transparency of the top coat and the medium, and even the transparent two-component urethane phase showed perfect initial adhesion.

In addition, in Table 2, titanium dioxide having a relatively high specific gravity can achieve easy dispersibility compared to carbon black, so that the dispersibility can be easily obtained even when a small amount of the dispersant is applied, and the amount of titanium dioxide can be increased. There is an advantage. Therefore, it can be applied with high concentration white primary color. It was confirmed that the dispersant having the polymer side chain applied in the present invention is excellent in dispersibility and easily dispersed, and its holding power lasts for a long time. Considering that the viscosity of the paint after dispersion is measured to be 30 sec or less, it can be predicted that the dispersibility is very excellent. In addition, it showed excellent appearance and gloss, clearness of coating, whiteness, etc. after coating of top coat, and also showed excellent adhesion and water resistance. In terms of the rheology of the solvent, a relatively fast drying type was applied. Due to such effects, workability and appearance were good.

In addition, in Table 3, in the case of the metallic paint to which the metallic pigment is applied, the effect of the cellulose ester and the wax was very important, and the role of the polyester resin was also important. If the orientation of the metallic pigment is poor, the appearance of the coating film becomes poor, so that a good coating effect could not be obtained. Suitable waxes facilitated the proper orientation of the metallic pigments and did not produce dust during spraying of the paint. As a solid color, low boiling point solvent is applied, and the low boiling point solvent has a high volatility, which gives the effect of lowering the possibility of unreasonable orientation by swinging itself on the coating after the metallic pigment is sprayed. It was. Silicone leveling agents are suitable for enhancing the orientation and appearance of metallic pigments and enhancing the fundamental appearance of automotive repair paints.

Experimental Example 1

The physical properties of the colored coating compositions prepared in Examples 1 to 3 were tested in the following manner, and the results are shown in Table 3 below.

[Test Methods]

1. Viscosity: Measured in seconds using a pod cup # 4.

2. Dispersion stability: After applying the milling machine, the dispersion stability was measured by checking the particle size by applying the particle size meter and coating test method.

3. Store at room temperature: Stored at room temperature for 7 days to measure the viscosity, appearance, paint state and the like.

4. Heat storage: Heat was stored for 7 days to measure the viscosity, appearance, paint state and the like.

5. Appearance: The clearness, gloss, metallic orientation, blackness, etc. were visually confirmed.

6. Color workability: The operator confirmed the coating film wetting, wet hiding, atomization, and the film lifting performance.

7. Top coat transparent wettability: The operator confirmed the transparent wettability and leveling properties, the transparency film lifting performance.

8. Adhesion: 1 mm cross-cut and adhesion test (three tests) were measured using Scotch tape (three times).

9. Impact resistance: 500g × height (10, 20, 30, 40, 50 cm) coating film damage was measured.

10. Water resistance: The appearance, gloss and clearness were measured by immersion for 40 ° C. × 7 days.

11. Water resistance: It measured by applying a scotch tape (1-3 times) by cutting 1 mm after 40 degreeC x 7 days.

12. Cold-tolerant chipping resistance: After 40 hours × 3 hours, 50g chipping stone was applied to the pressure of about 4 bar to measure the coating damage state.

Comparative Examples 1-2 and Example 4

In order to test an acrylic polyol resin having important physical effects on automotive paints, paint compositions for resins 1 and 2 and resin 3 of the present invention were compared.

Resin 1: It is resin which consists of solvents, such as butyl acetate and toluene, and a composition of meth methylacrylate, butyl acrylate, ethyl methacrylate, and benzoyl peroxide.

Resin 2: A resin consisting of solvents such as xylene and butyl alcohol, water, propyl methacrylate and glyceryl methacrylate, ethyl hexaacrylate, styrene, tertiary butyl perbenzoate, chlorobenzyl chloride and the like.

Resin 3: It is resin which consists of solvents, such as toluene and xylene, butyl acrylate, styrene, methyl methacrylate, butyl methacrylate, ethyl methacrylate, butyl perbenzolate, etc.

The other components for preparing Comparative Example 1 (Resin 1), Comparative Example 2 (Resin 2) and Example 4 (Resin 3) are the same as those applied in the above Examples, and the solid color applied paint composition for this is It is shown in Table 4 below.

In the case of Comparative Example 1, various advantages such as workability of the paint and wettability of the transparent coating were obtained. However, the glass transition temperature of the resin itself is relatively high, and poor results in impact resistance, adhesion, water resistance, etc. were confirmed by the internal reaction. If the glass transition temperature is high, the hardness of the coating film is increased, which can easily break even under a weak impact. In addition, the resin 1 has a glass transition temperature of about 51 ° C., but forms a self-reaction with other resins and raw materials, so that the hardness of the coating film becomes higher. In practice, the glass transition temperature of 51 ℃ is not high, but the experimental results confirmed the result of poor impact resistance.

In Comparative Example 2, it had a low glass transition temperature of −10 ° C. and gave a relatively soft coating film shape. However, relatively poor results in appearance and adhesion, water resistance, and water resistance of the coating film were caused. In appearance, the clearness was inferior and adhesion with the midway was very poor. Even if a small amount of melamine resin was added to the form of the resin 2, the effect of improving adhesion was not easily obtained. As a result of adhesion test after 3 hours water resistance test, adhesion with the median was very poor, indicating severe peeling. However, the relatively low glass transition temperature gave good results in impact resistance.

In the case of Example 4, good physical properties were obtained in comparison with the resins 1 and 2 mentioned above. Although the glass transition temperature was high (60 ° C.), it showed relatively good results in adhesion, water resistance, and impact resistance compared to resin 1 (glass transition temperature 50 ° C.). When a small amount of melamine resin was applied, the interlayer adhesion was enhanced and the wettability of the top clear was also observed to be good. It was evaluated as a resin that can be suitably applied in the present invention due to its suitable drying speed and flexibility, proper atomization in spraying operations, good orientation of metallic pigments and the like (when waxes are applied) and the like.

Experimental Example 2

Physical properties of the coating compositions of Comparative Examples 1 and 2 and Example 4 were carried out in the same manner as in Example, and the results are shown in Table 5 below.

Comparative Examples 3 to 4 and Example 5

In order to maintain the proper rheological properties and to apply the fast drying workability, a comparative experiment was carried out for the fast-drying solvent and the dry-drying solvent.

In the case of automotive repair paints, the one-component 2C1B type, when the drying speed of the color is slow, the worker's work speed is relatively slow, which may cause workers' dissatisfaction. In other words, it can lead to the worker's preference because the drying of the color coat can be applied to the top coat only if it is done quickly without affecting the appearance. In the present invention, the experiment was carried out to select a solvent that can be easily dried without affecting the appearance and other physical properties. The other solid color application paint composition components of Comparative Example 3 (ultra fast drying solvent), Comparative Example 4 (dry drying type) and Example 5 (fast drying type) are the same as those of Example 1, and the paint compositions are shown in Table 6 below. .

In the case of Comparative Example 3 (ultra-fast drying type solvent), the drying is relatively fast, so that it tends to volatilize before the stable formation of the coating film is made, which is considered to affect the appearance. As a result of examination of the appearance after coating the transparent coating, the clearness of the coating film was poor, especially in the metallic paint, which was very poor. In the case of super fast drying solvents, it is believed that due to the fast volatility it does not maintain the proper orientation of the metallic pigment. Rapid drying of solvents is very important in terms of worker's workability, but it is necessary to volatilize after proper coating is formed.

In Comparative Example 4 (slow-drying solvent), the stable drying of the coating film was achieved due to the slow drying speed, but the volatilization speed of the solvent was low, resulting in relatively poor workability. In the case of the top coat, it was necessary to wait a relatively long time, but the clearness of the coating was still maintained. However, workers' workability seems to be a problem. In the case of metallic paints, the orientation of the metallic pigments was worse. This result is judged to be due to the fact that the solvent affecting the flowability of the metallic pigment does not quickly volatilize, but remains in the coating film and affects the flowability of the metallic pigment.

In the case of Example 5 (fast-drying solvent), due to the proper drying rate, it was judged that the stable formation of the coating film was achieved, and showed a tendency to volatilize after the coating film was completely formed. As a result of examination of the appearance after coating the transparent coating, good clearness of the coating was maintained, and in particular, the metallic coating showed very good metallic orientation. In the case of fast-drying solvents, the good orientation of the metallic pigments was maintained due to the moderately fast volatility.

Experimental Example 3

Physical property test results of the coating compositions of Comparative Examples 3, 4 and 5 are shown in Table 7 below.

Comparative Example 5 and Example 6

In the case of automotive paints, if they are not perfectly dispersed, they will give a poor appearance. In the present invention, suitable dispersant experiments were examined to achieve perfect dispersion.

In the case of water-soluble paints, ionic dispersants using electrostatic repulsion are widely used, but are known to be inferior to nonionic polymer dispersants in long-term stability. In recent years, polymer dispersants have become mainstream. Nonionic polymer dispersants are mainly applied to oil-soluble paints, and disperse colloidal particles in a mechanism based on three-dimensional repulsive effects. In the present invention, various types of dispersants have been applied, but only two types will be mentioned. Other coating composition components of Comparative Example 5 (dispersant 1) and Example 6 (dispersant 2) were the same as in Example 1, the composition and content thereof are shown in Table 8.

Comparative Example 5 (dispersant 1) is in the form of a block copolymer composed of a long chain polymer having a pigment affinity group, and is a dispersant having a solid content of 90% by weight or more. Dispersant 1 (BYK) was slightly poor dispersion effect during the dispersion of the carbon black, it was confirmed that the viscosity of the paint after dispersion is somewhat high. The viscosity of the paint would have been very low if the dispersion had been done perfectly, and would result in good atomization during spray coating, but dispersant 1 had somewhat poor results in this respect. Similar results were obtained when other organic and inorganic pigments were applied.

In the case of Example 6 (dispersant 2), it is in the form of a block copolymer composed of a long chain polymer having a pigment affinity group, and is a dispersant composed of 50 wt% solids. Although it is structurally similar to Dispersant 1, it is considered that the side chain length, chemical structure, polarity, etc. are different. Dispersant 2 was excellent in the dispersion effect during the dispersion of carbon black, it was confirmed that the viscosity of the paint after dispersion is very low. The dispersion was judged to be perfect, and gave good atomization during spray coating. As a result of repainting after long-term storage of the paint, it also maintained good atomization, appearance, physical properties, etc., and dispersant 2 was applied to the present invention. These results were similar to other organic and inorganic pigments.

Experimental Example 4

Physical property test results of the coating compositions of Comparative Examples 5 and 6 are shown in Table 9 below.

Comparative Example 6 and Example 7

Cellulose esters are mostly applied as raw materials for improving the freshness and flow prevention of automotive paints, and the orientation of pigments. Cellulose esters can be classified into molecular weight, chemical structure, viscosity, and the like, and in the present invention, experiments were conducted by applying relatively high molecular weight and low molecular weight cellulose esters. Other coating compositions for Comparative Example 6 and Example 6 are the same as in Example 1, the composition and content are shown in Table 10 below.

In the case of Comparative Example 6, the polymerized cellulose ester is frequently applied because it gives the effect of enhancing the solubility and compatibility in the coating film, flexibility, water resistance and the like. In the present invention, the application of the polymerized cellulose ester resulted in excellent flexibility and compatibility, but resulted in very poor results in adhesion, workability and appearance. This result is because the side chain is located in the coating layer due to the long polymer type occupies the entire coating film, the poor adhesion and workability is considered to be related to this.

In the case of Example 7, it is known that the cellulose ester having a relatively low molecular weight compared with Comparative Example 6 (cellulose ester 1) gives an effect of improving hardness and adhesion, chemical resistance, water resistance and the like in the coating film. In the present invention, as a result of applying the low molecular weight cellulose ester, good results such as excellent adhesion and workability, appearance, and water resistance were maintained. These results indicate that the low-molecular-weight cellulose ester with short side chains is closely located in the coating film, resulting in good adhesion and workability. When a relatively large amount of cellulose ester was added, the top coat was very poor in adhesion. When a relatively small amount was added, poor impact resistance and adhesion were obtained. Therefore, it was important to apply the appropriate dosage.

Experimental Example 5

Physical properties of the coating compositions of Comparative Examples 6 and 7 are shown in Table 11 below.

Comparative Example 7 and Example 8

Melamine resin is mainly applied in order to obtain a crosslinking effect, but the present invention is a one-component room temperature dry paint, it is judged that such a perfect crosslinking effect will not be obtained. In practice, however, when a transparent coating is applied on a colored top coat, heat energy of about 60 ° C. is applied, and thus it is considered to have a small amount of participation in crosslinking and affect adhesion and other physical and chemical properties. Other components of Example 7 and Example 8 are the same as in Example 1, the paint composition and content are shown in Table 12 below.

Comparative Example 7 (methylated melamine resin 1) can easily participate in the crosslinking reaction even at a low temperature can give enhanced coating properties, but because it is relatively easy to react it is difficult to apply in terms of storage stability. In practice, the methylated melamine resin was applied, and the hardness and degree of crosslinking of the coating film were good (at room temperature and 60 ° C heating), but showed poor storage stability by self-curing and crosslinking reaction. It was a form. Methylated melamine resins did not require an acid catalyst but were difficult to apply in the present invention due to such poor stability.

In Example 8 (butylated melamine resin 2), it is known that some acid catalyst, external heat energy, and the like are required to achieve the crosslinking reaction. However, it was judged that a small amount of adhesion and crosslinking reaction could be achieved without applying an acid catalyst. Since the heat energy of 60 ° C. was transferred during the drying of the top transparent, the activated groups of the injected melamine were confirmed to participate in the crosslinking reaction by performing another chemical reaction. However, the degree was weak and did not cause a problem in the storage stability of the paint. When heat storage at 60 ℃ showed a tendency to increase somewhat, but did not actually change the appearance and physical properties after coating. Appropriate butylated melamine resins can be applied to obtain improved physical properties. In the case of butylated melamine resins, the application amount is very important, and it seems that the storage stability is somewhat caused when a relatively excessive amount is added.

Experimental Example 6

Physical properties of the coating compositions of Comparative Examples 7 and 8 are shown in Table 13 below.

Comparative Example 8 and Example 9

Polyester resins are known as important raw materials that affect the flexibility and flexibility of coating films, the orientation of metallic pigments, and the like. In the present invention, in order to select a polyester resin, it was applied to the experiment by comparing the form with the form without the anti-dripping effect. The paint compositions for Comparative Example 8 and Example 9 are shown in Table 14 below, and the other components are the same as in Example 1.

In the case of Comparative Example 8 (polyester resin having no anti-flowing effect, Non SCA), there was no effect on the applicability and adhesion, but problems in appearance and final appearance of the coating film were raised. This effect is judged to be a characteristic of the polyester resin itself.

In the case of Example 9 (polyester resin in which the component of the anti-flow effect exists, SCA), the applicability | paintability and adhesiveness, the appearance clearness, etc. showed favorable results. This effect did not have a problem in appearance due to the flow of paint after painting the paint on the vertical surface and it was judged that the influence of the resin on the appearance is very small.

Experimental Example 7

Physical property test results for the coating composition are shown in Table 15 below.

Comparative Example 9 and Example 10

Adhesion promoters have been applied to promote adhesion with mid- and high-level transparencies. In general, silane-type adhesion promoters are mainly applied, and chelated metal components are frequently applied. As the adhesion promoter applied in the present invention, experiments were carried out by applying an adhesion activating material including a highly reactive silane form and an organic-inorganic composite functional group, and the coating compositions for Comparative Examples 9 and 9 are shown in Table 16 below. Indicated.

In the case of Comparative Example 9 (adhesion promoter containing both organic and inorganic components), it is an additive that binds different substances through chemical bonding. As a mechanism of action, inorganic and organic functional groups are present in each molecule to provide an adhesion effect by irreversible chemical interaction between various compounds and materials. In the present invention, an adhesion promoter having such a component was applied, but in practice, the efficiency of adhesion was very low and no suitable chemical reaction was expressed.

In the case of Example 10 (silane with an activation group), it is frequently applied to oil-soluble paints. Since silane is highly reactive with water, when applied to water solubility, it may initially show adhesion and physical property enhancement, but may give very poor storage stability due to the appearance of gelation of the paint over a future storage stability period. However, in the case of usefulness, since there is no large amount of water or hydroxyl groups capable of reacting with silane, it is a form of adhesion enhancement that is easily accessible. In practice, adhesion promoters are often applied to promote adhesion with the underlying materials, and they are known to have little effect on other types of paints coated on top of silane-containing paints. It is also believed to give a role of promoting adhesion to the coated film. It was confirmed that physical properties such as adhesion, water resistance, and impact resistance that may occur when the hydroxyl group of the polyol resin generally applied in the top transparency and the amount of isocyanate input are small can be improved by the adhesion promoter in the form of silane. The adhesion promoter in the form of silane is believed to exert a synergistic effect of enhancing the adhesion of the acrylic polyol resin and the melamine resin.

Physical property test results for the coating composition are shown in Table 17 below.

As described above, the colored coating composition of the present invention works by applying a resin system such as acrylic polyol resin and melamine resin, polyester resin, cellulose ester, pigment, quick-drying solvent, wax, dispersant, adhesion promoter, silicone additive, and the like. It is suitable for use as a color paint for automobile repair by improving the properties and appearance, the orientation of the metallic pigment, drying, adhesion, water resistance, top coat transparent wettability and the like.

Claims (7)

In the one-component automotive repair colored paint composition, 5 to 50% by weight of a one-component acrylic polyol resin having a solid content of 30 to 70% by weight; 5 to 20% by weight of a butylated melamine resin having a solid content of 30 to 70% by weight as a crosslinking agent; 15-50% by weight of cellulose ester, 5-30% by weight of polyester resin, 2-5% by weight of dispersant, 10-40% by weight of quick-drying solvent, 3-10% by weight of wax, 1-30% by weight of pigment, silicone leveling agent A color coating composition for repairing a one-component room temperature dry type automobile, comprising 0.05 to 2% by weight and 0.05 to 5% by weight of an adhesion promoter. The colored liquid composition of claim 1, wherein the monomers constituting the one-component acrylic polyol resin are butyl acrylate, styrene, and butyl methacrylate. According to claim 1, wherein the cellulose ester is a one-component room temperature dry type automotive repair colored paint composition, characterized in that the low molecular weight form of the molecular weight of 18,000 to 20,000. According to claim 1, wherein the polyester resin has a solid content of 30 to 70% by weight, and a one-component room temperature dry type automotive repair colored paint, characterized in that it contains a urethane functional group (SCA: sagging Control Agents) component Composition. The method of claim 1, wherein the dispersing agent is a solid content of 30 to 60% by weight, the one-component room temperature dry type automotive repair colored paint composition, characterized in that the block copolymer of the acrylic polyester polymer. The method of claim 1, wherein the quick-drying solvent is a one-component room temperature dry type automotive repair colored paint composition, characterized in that selected from butyl acetate, xylene, toluene. The method of claim 1, wherein the adhesion promoter is a one-component room temperature dry type automotive repair colored paint composition, characterized in that the epoxy functional group is 50 to 70% by weight of the silane compound (unclear).