KR20090073588A - Uv-curing putty paint for repairing a vehicle and method of forming the putty layer - Google Patents

Abstract

A UV-curing putty paint for repairing a vehicle is provided to ensure fast curing dry property and excellent processability, to form a film with excellent hardening property and to reduce working time. A UV-curing putty paint for repairing a vehicle comprises a photo-curable acrylate-based resin 25-45 parts by weight, a photocurable monomer 0-10 parts by weight, extender pigment 40-70 parts by weight, a photoinitiator 0.01-1 parts by weight and additives 0.5-4 parts by weight including thickener, sedimentation inhibitor and organic acid. The photo-curable acrylate-based resin comprises a urethane acrylate resin or an epoxy acrylate resin.

Description

UV Curing Putty Paint and Putty Film Formation Method for Automotive Repairs {UV-CURING PUTTY PAINT FOR REPAIRING A VEHICLE AND METHOD OF FORMING THE PUTTY LAYER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a UV repair putty paint and a coating film forming method for automobiles, and more particularly, to a method for forming putty film using a UV repair putty paint and an ultraviolet curing putty paint for automobiles including a photocurable oligomer.

Putty paints for automobile repairs must first exhibit fast curing properties at room temperature, secondly have excellent abrasive properties, and thirdly have good adhesion properties with existing materials. Among them, consumer demand for fast drying is the biggest. This is the time required for putty drying as it reduces the number of putty operations by reducing the frequency of putty painting and the number of years of experience in putty painting in the painting system that coats from the top to top. Sex is very much required. Therefore, in order to shorten working time of putty paint, drying time should be as fast as possible after puttingty work. In conventional thermosetting system of unsaturated polyester, it is 30 minutes at normal temperature and 10-15 minutes at 60 ℃ temperature under normal temperature and heat treatment. A degree of drying time is required. In addition, since the state of the cotton is changed according to the degree of skill in the process of weighing and mixing the paint, it is not possible to proceed smoothly without the skilled person, and the time required varies greatly depending on the degree of skill. In addition, the existing unsaturated polyester is a one-time, once the mixed paint is not reused and the pot life is short, the situation is causing a high loss of paint.

Accordingly, an object of the present invention is to provide an ultraviolet curing putty paint applied to automobile repair which is useful for shortening working time and improving work efficiency of unskilled workers with very fast drying property.

Another object of the present invention is to provide a method for forming a putty film using the above-mentioned ultraviolet curing putty paint for automobile repair.

The present invention for achieving the above object is to provide an ultraviolet curable putty paint for automobile repair. The UV curable putty paint for automotive repair includes 25 to 45 parts by weight of a photocurable acrylate resin, 0 to 10 parts by weight of a photocurable monomer, 40 to 70 parts by weight of a sieving pigment, 0.01 to 1 part by weight of a photoinitiator, a thickener, and a sedimentation inhibitor. And 0.5 to 4 parts by weight of an additive including an organic acid. As an example, the photocurable acrylate resin may include a urethane acrylate resin or an epoxy acrylate resin.

In order to achieve the above object another object of the present invention provides a method for forming a putty film using a UV curable putty paint for automobile repair. In order to form the putty film, 25 to 45 parts by weight of the photocurable acrylate resin, 0 to 10 parts by weight of the photocurable monomer, 40 to 70 parts by weight of the extender pigment, 0.01 to 1.0 part by weight of the photoinitiator, thickener, sedimentation inhibitor and organic acid are used. It is coated on the object by using a UV repair putty paint for automobiles, characterized in that it comprises 0.5 to 4 parts by weight of an additive. Thereafter, the ultraviolet curing putty coating coated on the object is cured using ultraviolet rays. As a result, a repairing purdy film is formed on the object.

As an example, the Purdy film preferably has a Pendulum hardness of 20 to 80 s when irradiated for 1 minute at the accumulated amount of ultraviolet light of 500 to 1000 mj / cm 2, and the Purdy film has a surface and inside thereof even at a thickness of 200 μm or more. It is preferable that all have a hardened state.

As mentioned, the photocurable putty paint having the composition according to the present invention contains not more than 1% of an initiator useful for internal curing and an initiator useful for surface curing, so that a coating film having excellent internal curing property can be obtained for the same light source. In particular, it is possible to apply to a thick film and an opaque paint, which is a problem of the conventional photocurable paint, and excellent workability and fast vehicle repair are possible.

Hereinafter, a UV repair putty paint for automobile repair and a putty film forming method using the same according to various aspects of the present invention will be described in detail. However, the present invention is not limited to the following embodiments and may be implemented in other forms. The embodiments introduced herein are provided to make the disclosure more complete and to fully convey the spirit and features of the invention to those skilled in the art.

UV curing Putty paint

The UV curable putty paint according to the present invention is used for automobile repair, and has a composition including a photocurable acrylate resin, a photocurable monomer, a extender pigment, a photoinitiator, and an additive.

Examples of the photocurable acrylate resin include urethane acrylate resins and epoxy acrylate resins. These can be used individually or in mixture of 2 or more.

If the content of the photo-curable acrylate resin contained in the ultraviolet curing putty paint is less than 25 parts by weight based on 100 parts by weight of the total amount of sedimentation stability of the formed coating is caused, while the viscosity exceeds 45 parts by weight High dispersion and workability are difficult. Therefore, the UV curable putty paint contains about 25 to 45 parts by weight of the photocurable acrylate resin, and preferably about 30 to 40 parts by weight.

As an example of said photocurable monomer, dipentaerythritol erythritol hexaacrylate, pentaerythritol tetraacrylate, pentaerythritol triacrylate, trimethylol propane triacrylate, ethoxylated trimethylol propane triacrylate, ethoxylay Polyfunctional monomers such as tide trimethylol propane methacrylate, propoxylated trimethylol propane triacrylate, propoxylated trimethylol propane trimethacrylate, 1,6-hexanediol diacrylate, triphenylglycol di Acrylate, butanediol diacrylate, 1,3-butylene glycol dimethacrylate, 1,6-hexanediol dimethacrylate, neopentylglycol diacrylate, ethylene glycol dimethacrylate, diethylene glycol diacrylate Ethylene, Diethylene Glycol Dimethacrylate, Tetra Ethylene glycol diacrylate, tetraethylene glycol dimethacrylate, triethylene glycol diacrylate, triethylene glycol dimethacrylate, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, dipropylene glycol diacrylate, Acrylic or vinyl monomers such as oxylated neopentylglycol diacrylate, 2hydroxy ethyl acrylate, 2ethyl hexyl acrylate, lauryl acrylate, hydroxy propyl acrylate, styrene, and the like. These can be used individually or in mixture of 2 or more.

When the content of the photocurable monomer contained in the ultraviolet curing putty paint exceeds 10 parts by weight with respect to 100 parts by weight of the total, the viscosity to be formed may be lowered to flow. Accordingly, the ultraviolet curable putty paint contains about 0 to 10 parts by weight of the photocurable monomer, and preferably about 1 to 6 parts by weight.

The photoinitiator may be a conventional polymerization initiator activated by ultraviolet rays, and examples of the polymerization initiator may be benzophenone series, benzyl dimethyl ketal series, acetophenone series, andhraquinone series, thioxanthone series, acyl phosphine oxide. 2-hydroxy, 1,2-diperphenyl ethanone, 2-ethoxy 1,2- large phenyl ethanone, such as a system, an amino alkyl phenone system, a hydroxy alkyl phenone system, a dialkoxy acetophenone system, a benzyl ketal system, etc. , Isoisopropyl 1,2-phenyl ethanone, 2-butoxy 1,2-diphenyl ethanone, 2-isobutoxy 1,2-diphenylethanone, 2,2-dimethoxy 1,2-di Phenylethanone, 2,2-dibutoxy 1-phenyl ethanone, 1-hydroxy cyclohexyl phenyl ketone, dimethoxy hydroxy acetophenone, 1- (4-isopropylphenyl) -2-hydroxy 2-methyl Propanone, 2-methyl 1- [4- (methylthio) phenyl] -2-morpholino propane, 2-benzyl 2-dimethylamino 1- (4-morpholinophenyl) -butanone, etc. Ketones and the 3,6-bis [2-methyl-2-morpholino (propanoyl) -piperidin-butyl-carbazole, bis (2,4,6-trimethylbenzoyl) -phenyl phosphine oxide may be a pin or the like. These can be used individually or in mixture of 2 or more. Particularly, in the case of putty paint for automobile repair, thick film coating is performed to about 1 mm, and the conventional short wavelength photo initiator and the long wavelength photo initiator having high reactivity are mixed and used, and preferably about 9: 1 to 7: 1 degree should be mixed.

When the content of the photoinitiator contained in the ultraviolet curing putty paint is less than 0.01 parts by weight based on 100 parts by weight, photocuring does not proceed efficiently and the curing time is slowed. On the other hand, when the content exceeds 1 part by weight The stability is lowered and after curing, the remaining amount of photoinitiator may act as a contaminant. Therefore, the ultraviolet curing putty paint contains about 0.01 to 1.0 parts by weight of the photoinitiator, and preferably about 0.05 to 0.3 parts by weight.

 The UV-curable putty paint includes a extender pigment that gives a color for identification of the coating portion. When the content of the extender pigment contained in the UV-curable putty paint is less than 40 parts by weight, there is a problem in that the polishing property is lost, and when the content exceeds 70 wt. it's difficult. Accordingly, the UV curable putty paint contains about 40 to 70 parts by weight of the extender pigment, and preferably about 45 to 60 parts by weight.

The ultraviolet curing putty paint of the present invention contains 0.5 to 4 parts by weight of additives. Examples of the additives include sedimentation inhibitors, thickeners, storage stabilizers, abrasives, organic acids, and the like.

As an example, the anti-settling agent prevents the extender pigments, etc. contained in the paint to sink, and the thickener serves to prevent the viscosity of the coating composition to flow. In addition, the organic acid serves to promote adhesion to the iron plate holding. The sedimentation inhibitor, thickener, storage stabilizer, abrasive and organic acid may be used by mixing two or more. The additives are used to impart an optimal coating state and coating performance according to the type thereof, and the additives are mixed in an appropriate ratio because their types and amounts are different, and the amount of each additive is not a limiting factor of the present invention.

Hereinafter, a method for forming a putty film for automobile repair will be described.

In order to form the automotive repair putty film according to the present invention, first, the photocurable acrylate resin 25 to 45 parts by weight, the photocurable monomer 0 to 10 parts by weight, the extender pigment 40 to 65 parts by weight, the photoinitiator 0.01 to 1.0 part by weight And 0.5 to 4 parts by weight of an additive including a thickener, a sedimentation inhibitor, and an organic acid. A detailed description of the UV repair putty paint for automobile repair is as described above.

Subsequently, the UV curable putty paint is used to coat the object. As an example, the object is a metal steel plate or a damaged automobile surface, and the putty paint is preferably coated on the surface of the object to have a thickness of about 0.8 to 3 mm.

Subsequently, the ultraviolet curing putty paint coated on the object is cured using ultraviolet rays. As a result, a putty film having high hardness is formed on the object.

As an example, the ultraviolet light has a wavelength in the range of 100 to 400 nm, more preferably in the range of 200 to 400 nm. In addition, the ultraviolet light is preferably irradiated for about 40 seconds to 120 seconds at a cumulative light amount of 500 to 1000mj / ㎠. As an example, the putty film has a hardness of about 20 to 80 s when ultraviolet rays having an accumulated light amount of 500 to 1000 mj / cm 2 are irradiated to the Purdy paint for 1 minute. Further, the Purdy film has a state in which both its surface and its interior are cured even at a coating film thickness of 200 µm or more.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following examples are provided to illustrate the present invention, and the present invention is not limited to the following examples and may be variously modified and changed. In the following examples, the content means parts by weight.

Example 1

Urethane acrylate resin 32.98 parts by weight, 1.6 hexanediol diacrylate (Miwon Corporation: HDDA) 2.97 parts by weight, photoinitiator (Ciba-Geigy: IRGACURE-184) / (Ciba-Geigy: IRGACURE-819) / solvent (LG Caltex: TOL) = 0.0344 / 0.069 / 0.138 parts by weight, 0.5 parts by weight of anti-settling agent, 0.5 parts by weight of thickener, 40.55 parts by weight of extender pigment (TALK # 325: Ilshin Industry), barium sulfate (Baryte Powder NB-3000: Korea Bio Material) 21.48 By weight, 0.78 parts by weight of an organic acid (EB168: SK Cytec.) Were mixed to obtain an ultraviolet curing putty paint having a viscosity of 850 and specific gravity of 1.8.

Example  2

33.18 parts by weight of urethane acrylate resin, 3.98 parts by weight of 2-Hexyl Acrylate (Miwon Corporation: 2-HEA), photoinitiator (Ciba-Geigy: IRGACURE-184) / (Ciba-Geigy: IRGACURE-819) / solvent (LG Caltex: TOL) = 0.0344 / 0.069 / 0.138 parts by weight, 0.5 parts by weight of sedimentation inhibitor, 0.5 parts by weight of thickener, sieving pigment (TALK # 325: Ilshin Industry) 41.3 parts by weight, barium sulfate (Baryte Powder NB-3000: Korea Bio-Materials) 19.5 By weight, 0.80 part by weight of an organic acid (EB168: SK Cytec.) Was mixed to obtain an ultraviolet curing putty paint having a viscosity of 550 and a specific gravity of 1.77.

Example  3

Urethane acrylate resin B composition: 32.42 parts by weight, Styrene monomer (Miwon Corporation: SM) 3.98 parts by weight, photoinitiator (Ciba-Geigy: IRGACURE-184) / (Ciba-Geigy: IRGACURE-819) / solvent (LG Caltex: TOL ) = 0.0344 / 0.069 / 0.138 parts by weight, sedimentation inhibitor 0.64 parts by weight, thickener 0.64 parts by weight, sieving pigment (TALK # 325: Ilshin Industry) 42.09 parts by weight, barium sulfate (Baryte Powder NB-3000: Korea Bio Material) 19.41 weight 0.79 parts by weight of an organic acid (EB168: SK Cytec.) Was mixed to obtain an ultraviolet curing putty paint having a viscosity of 1100 to 1500 and a specific gravity of 1.78.

Example  4

38.00 parts by weight of urethane acrylate resin A composition, 2.96 parts by weight of 2-Hexyl Acrylate (Miwon Corporation: 2-HEA), photoinitiator (Ciba-Geigy: IRGACURE-184) / (Ciba-Geigy: IRGACURE-819) / solvent (LG Caltex: TOL) = 0.0344 / 0.069 / 0.138 parts by weight, 0.5 parts by weight of sedimentation inhibitor, 0.5 parts by weight of thickener, 56.0 parts by weight of extender pigment (TALK # 325: Ilsin Industry), 0.80 parts by weight of organic acid (EB168: SK Cytec.) To obtain an ultraviolet curing putty paint having a viscosity of 500 and a specific gravity of 1.42.

Example  5

38.00 parts by weight of epoxy acrylate resin C composition, 2.96 parts by weight of 2-Hexyl Acrylate (Miwon Corporation: 2-HEA), photoinitiator (Ciba-Geigy: IRGACURE-184) / (Ciba-Geigy: IRGACURE-819) / solvent (LG Caltex: TOL) = 0.0344 / 0.069 / 0.138 parts by weight, 0.5 parts by weight of sedimentation inhibitor, 0.5 parts by weight of thickener, 56.0 parts by weight of extender pigment (TALK # 325: Ilsin Industry), 0.80 parts by weight of organic acid (EB168: SK Cytec.) To obtain an ultraviolet curing putty paint having a viscosity of 850 and a specific gravity of 1.43.

1) Viscosity: Measured by Poise Viscometer Spindle No.2.

2) Specific gravity: Measured at room temperature with 100ml specific gravity cup

Physical property evaluation of coating film

In Examples 1 to 5, a thickness of about 0.5 to 3 mm was coated on the surface of the cold rolled steel sheet (CR steel plate) polished and washed with # 220 abrasive paper and cured with UV curing putty paint, respectively, and a distance of 10 cm using a lamp of 80 W / cm. Irradiated for 1 minute at and cured and dried so that the accumulated light amount was 800mj / cm 2, and the coating film performance was evaluated by the following method. In addition, the conventional unsaturated putty paint (Norus paint, Magic putty) was coated by the above-described method and evaluated after 1 day drying. The results are shown in Table 1.

TABLE 1

Legend: ◎ very good, ○ excellent, △ somewhat poor, × bad

1) Abrasiveness (Initial polishing pinching phenomenon): After grinding with # 220 abrasive paper, give a shock to the abrasive paper and shake it off after visual inspection.

2) Adhesion: The degree to which the panel is folded. (Visual judgment)

3) Internal Hardenability: After coating over 3mm thick and peeling off, soak it in general Xylene and measure the thickness of the remaining coating film after 1 hour.

4) Appearance and Attachment of Prasfe: After sanding with # 220 abrasive paper, apply two-component Prasape for repairing car, and determine the appearance and adhesion with Prasfe.

5) Abrasive loss: Measured after drying for 1 day comparable self-supporting poly persity, measured immediately after curing UV putty.

Referring to the results of Table 1, in the case of the putty paints of Examples 1 to 5, the quality required for the automotive repair paint, that is, dryness, appearance, internal curing, scratch resistance, weather resistance, gloss, etc. It confirmed that it had equivalent or more and hardening drying had one component of drying. In particular, it was confirmed that the curing and storage properties are excellent compared to the paint of the comparative example.

As described above, the UV-curable putty paint according to the present invention is a thick film which is a problem of the conventional photocurable paint and is applicable to an opaque paint, thereby enabling quick vehicle repair. The putty paint, as well as the shape and demand properties of consumers can be properly adjusted to obtain the desired product in the market, but in the difficult state to obtain a putty that can be compared to the existing product, the shelf life is stable compared to the existing product and more than 1 minute irradiation It has the effect of shortening the working time so as to have curing drying property.

Claims (6)

25 to 45 parts by weight of the photocurable acrylate resin, 0 to 10 parts by weight of the photocurable monomer, 40 to 70 parts by weight of the extender pigment, 0.01 to 1 part by weight of the photoinitiator and an additive including a thickener, a sedimentation inhibitor and an organic acid 0.5 to 4 UV curable putty paint for automobile repair comprising a weight part. The UV curable putty paint for automobile repair according to claim 1, wherein the photocurable acrylate resin comprises a urethane acrylate resin or an epoxy acrylate resin. The method of claim 1, wherein the photocurable monomer is dipentaerythritol erythritol hexaacrylate, pentaerythritol tetraacrylate, pentaerythritol triacrylate, trimethylol propane triacrylate, ethoxylated trimethylol propane triacrylate , Ethoxylated trimethylol propane methacrylate, propoxylated trimethylol propane triacrylate, propoxylated trimethylol propane trimethacrylate, 1,6-hexanediol diacrylate, triphenylglycol diacryl Butanediol diacrylate, 1,3-butylene glycol dimethacrylate, 1,6-hexanediol dimethacrylate, neopentyl glycol diacrylate, ethylene glycol dimethacrylate, diethylene glycol diacrylate , Diethylene glycol dimethacrylate, tetraethylene glycol Acrylate, tetraethylene glycol dimethacrylate, triethylene glycol diacrylate, triethylene glycol dimethacrylate, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, dipropylene glycol diacrylate, ethoxylated Neopentylglycol diacrylate, 2hydroxy ethyl acrylate, 2ethyl hexyl acrylate, lauryl acrylate, hydroxy propyl acrylate and styrene, at least one selected from the group consisting of styrene Curing putty paint. 25 to 45 parts by weight of the photocurable acrylate resin, 0 to 10 parts by weight of the photocurable monomer, 40 to 65 parts by weight of the extender pigment, 0.01 to 1.0 part by weight of the photoinitiator and an additive including a thickener, a sedimentation inhibitor and an organic acid 0.5 to 4 Coating on an object using an ultraviolet curable putty paint for automobile repair, comprising a weight part; And A method of forming a putty film, the method comprising: curing a UV curable putty coating coated on the object using ultraviolet rays to form a putdy film. The method of claim 4, wherein the paddy film has a pendulum hardness of 20 to 80 s when irradiated for 1 minute at an accumulated light amount of 500 to 1000 mj / cm 2 of ultraviolet rays. 5. The method for forming a putty film according to claim 4, wherein the Purdy film has a state in which both its surface and its interior are cured even at a coating film thickness of 200 mu m or more.