KR20210031288A - Base coat composition - Google Patents

Abstract

The present invention relates to a base coat composition with excellent adhesion to flame-retardant materials and, more specifically, to a base coat composition comprising: a polyolefin resin; first acrylic polyol; second acrylic polyol; and third acrylic polyol, wherein the first acrylic polyol has a higher hydroxyl value and lower glass transition temperature than the second acrylic polyol, and the third acrylic polyol has a higher hydroxyl value and lower glass transition temperature than the first acrylic polyol.

Description

Base coat composition {BASE COAT COMPOSITION}

The present invention relates to a base coat composition having excellent adhesion to a flame retardant material, enabling removal of a primer process, and excellent moisture resistance, fragrance resistance, and sunscreen resistance.

Automotive plastic parts are generally used after being painted in order to improve the appearance characteristics and protect the surface from the external environment. At this time, the painting treatment is usually a pretreatment that improves the surface tension between the plastic part and the paint through flame or corona discharge treatment, a primer treatment to increase the adhesion of the plastic part and the base coating, and improves the appearance characteristics of the plastic part and protects the exterior. It consists of a base coating film for.

At this time, a flame retardant material, for example, a polypropylene (PP)-based, nylon or thermoplastic polyolefin (TPO)-based material is generally used as a material for a plastic part for automobile interiors. For this reason, as a primer for plastic parts for automobile interiors, olefin resins having excellent adhesion to flame-retardant materials are widely used. In addition, the base coat of plastic parts for automobile interiors typically includes an acrylic polyol resin having excellent sunscreen resistance and fragrance resistance.

In this regard, Korean Patent Registration No. 792,937 (Patent Document 1) discloses a primer composition containing a chlorinated aqueous olefin resin, a polyurethane resin, and an aqueous silicone resin, and aliphatic urethane, silicone polyol for aliphatic urethane modification, and N-methyl. A method of aqueous coating of a plastic sheet surface using a thermoplastic polycarbonate urethane composition containing -2-pyrrolidone is disclosed. However, in the coating method of Patent Document 1, there is a hassle of heating-drying and performing base coating after primer coating.

Therefore, it has excellent adhesion to flame-retardant materials, so it is possible to remove the primer process, so it is economical, and the manufactured coating film is researched and developed for a base coat composition that has excellent various physical properties such as moisture resistance, sunscreen resistance, and fragrance resistance. This is a necessary situation.

Korean Patent Registration No. 792,937 (published on August 8, 2008)

Accordingly, the present invention provides a base coat composition having excellent adhesion to a flame-retardant material so that the primer process can be eliminated, and the prepared coating film is excellent in various physical properties such as moisture resistance, sunscreen resistance, and fragrance resistance.

The present invention comprises a polyolefin resin, a first acrylic polyol, a second acrylic polyol and a third acrylic polyol,

The first acrylic polyol has a higher hydroxyl value and a lower glass transition temperature than the second acrylic polyol,

The third acrylic polyol provides a base coat composition having a higher hydroxyl value and a lower glass transition temperature than the first acrylic polyol.

The base coat composition according to the present invention has excellent coating workability and excellent adhesion to flame-retardant materials, so that the primer process can be eliminated, thereby providing excellent economical efficiency.

In addition, the coating film prepared from the base coat composition is excellent in various physical properties such as appearance characteristics, moisture resistance, sunscreen resistance, and fragrance resistance.

Hereinafter, the present invention will be described in detail.

As used herein, "weight average molecular weight" is measured by a conventional method known in the art, for example, it can be measured by a gel permeation chromatograph (GPC) method. Further, the "glass transition temperature" is measured by a conventional method known in the art, for example, it can be measured by differential scanning calorimetry (DSC). In addition, functional groups such as "acid value" and "hydroxyl value" may be measured by methods well known in the art, and may represent values measured by, for example, titration.

In addition, in the present specification, “(meth)acrylic” means “acrylic” and/or “methacrylic”, and “(meth)acrylate” means “acrylate” and/or “methacrylate” .

The base coat composition according to the present invention includes a polyolefin resin, a first acrylic polyol, a second acrylic polyol, and a third acrylic polyol.

Polyolefin resin

Polyolefin resin serves to improve the adhesion to the flame retardant material.

At this time, the polyolefin resin may be a chlorinated modified polyolefin resin, and the chlorinated modified polyolefin resin refers to a polyolefin resin modified with chlorine (Cl). Specifically, the polyolefin resin may be a chlorinated polyolefin resin modified with an unsaturated fatty acid. The chlorinated polyolefin resin modified with the unsaturated fatty acid refers to a resin obtained by modifying the chlorinated modified polyolefin resin with an unsaturated fatty acid.

The unsaturated fatty acid may be at least one selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, maleic anhydride, itaconic anhydride, and oleic acid. Specifically, the unsaturated fatty acid may be maleic acid. That is, the polyolefin resin may be a chlorinated polyolefin modified with maleic acid.

In addition, the polyolefin resin may include at least one selected from the group consisting of polyethylene, polypropylene, polyisopropylene, polybutylene, and copolymers thereof.

Furthermore, the polyolefin resin may have a weight average molecular weight (Mw) of 50,000 to 100,000 g/mol, or 60,000 to 90,000 g/mol. When the weight average molecular weight of the polyolefin resin is within the above range, there is an effect of excellent coating workability.

In addition, the polyolefin resin may have a chlorine content of 10 to 35% by weight, or 20 to 30% by weight, based on the total weight of the resin. When the chlorine content of the polyolefin resin is within the above range, there is an effect of excellent adhesion.

Furthermore, the polyolefin resin may have an unsaturated fatty acid content of 0.5 to 5% by weight, or 1 to 2% by weight, based on the total weight of the resin. When the content of the unsaturated fatty acid in the polyolefin resin is within the above range, the appearance is excellent.

In addition, the polyolefin resin may be in a solid state, and for workability, the polyolefin resin may be dissolved in a solvent so that the solid content is 15 to 25% by weight based on the total weight. When the solid content is within the above range, there is an effect of excellent compatibility with acrylic resin and storage of paint.

In addition, the chlorinated polyolefin resin may have a viscosity (Gardner viscosity) of A4 to A at 25°C. When the viscosity (Gardner viscosity) of the polyolefin resin at 25° C. is within the above range, there is an effect of excellent storage properties of the paint.

Further, the polyolefin resin may be included in the composition in an amount of 15 to 25 parts by weight, or 17 to 23 parts by weight based on 100 parts by weight of the base coat composition. When the content of the polyolefin resin is within the above range, adhesion to the flame retardant material is excellent, and the basic physical properties of the coating film, such as sunscreen resistance and fragrance resistance, may be improved.

First acrylic polyol

The first acrylic polyol serves to improve the fragrance resistance of the base coat composition.

The first acrylic polyol may be directly synthesized according to a known method, or a commercially available product may be used. In this case, the first acrylic polyol may be prepared by polymerizing, for example, an acrylic monomer containing a hydroxyl group.

Examples of the hydroxyl group-containing acrylic monomer include 2-hydroxymethyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, and 2-hydroxybutyl ( Meth)acrylate, 1,3-butanediol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, ethylene glycol di(meth)acrylate and 1,6-hexanediol di(meth)acrylate It may include one or more selected from the group consisting of.

In this case, the first acrylic polyol may be prepared by polymerizing a hydroxyl group-containing acrylic monomer and a vinyl monomer as described above. The kind of the vinyl monomer is not particularly limited, but, for example, styrene, methylstyrene, dimethylstyrene, fluorostyrene, ethoxystyrene, methoxystyrene, (meth)acrylate, methyl (meth)acrylate, ethyl ( It may include at least one selected from the group consisting of meth)acrylate, butyl (meth)acrylate, and isobutyl (meth)acrylate.

In addition, the first acrylic polyol has a higher hydroxyl value and a lower glass transition temperature than the second acrylic polyol, and has a lower hydroxyl value and a higher glass transition temperature than that of the third acrylic polyol.

Specifically, the first acrylic polyol may have a hydroxyl value (OHv) of 50 to 70 mgKOH/g, or 60 to 70 mgKOH/g, and a glass transition temperature (Tg) of 38 to 45°C, or 40 to 44°C. have. When the hydroxyl value of the first acrylic polyol is within the above range, the moisture resistance is excellent, and when the glass transition temperature is within the above range, the acetone resistance is excellent.

Furthermore, the first acrylic polyol may have a weight average molecular weight (Mw) of 15,000 to 30,000 g/mol, or 18,000 to 25,000 g/mol. When the weight average molecular weight of the first acrylic polyol is within the above range, there is an effect of excellent fragrance resistance.

The first acrylic polyol may have a solid content of 40 to 65% by weight, or 45 to 55% by weight, based on the total weight of the resin. When the solid content of the first acrylic polyol is within the above range, the appearance is excellent.

In addition, the first acrylic polyol may be included in the composition in an amount of 1 to 20 parts by weight, or 5 to 15 parts by weight based on 15 to 25 parts by weight of the polyolefin resin. When the content of the first acrylic polyol is within the above range, there is an effect of excellent fragrance resistance.

Second acrylic polyol

The second acrylic polyol serves to improve the sunscreen resistance of the base coat composition.

The second acrylic polyol may be directly synthesized according to a known method, or a commercially available product may be used. In this case, the second acrylic polyol may be prepared by polymerizing, for example, an acrylic monomer containing a hydroxyl group.

Examples of the hydroxyl group-containing acrylic monomer include 2-hydroxymethyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, and 2-hydroxybutyl ( Meth)acrylate, 1,3-butanediol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, ethylene glycol di(meth)acrylate and 1,6-hexanediol di(meth)acrylate It may include one or more selected from the group consisting of.

In this case, the second acrylic polyol may be prepared by polymerizing a hydroxyl group-containing acrylic monomer and a vinyl monomer as described above. The type of the vinyl monomer is not particularly limited, but, for example, styrene, methylstyrene, dimethylstyrene, fluorostyrene, ethoxystyrene, methoxystyrene, methyl (meth)acrylate, ethyl (meth)acrylate, butyl It may include at least one selected from the group consisting of (meth)acrylate and isobutyl (meth)acrylate.

In addition, the second acrylic polyol has a lower hydroxyl value and a higher glass transition temperature than the first acrylic polyol, and has a lower hydroxyl value and a higher glass transition temperature than that of the third acrylic polyol.

Specifically, the second acrylic polyol has a hydroxyl value (OHv) of 20 mgKOH/g or more and less than 50 mgKOH/g, or 35 to 45 mgKOH/g, and a glass transition temperature (Tg) of more than 45° C. and 60° C. or less, or 46 to It may be 55 °C. When the hydroxyl value of the second acrylic polyol is within the above range, there is an effect of excellent sunscreen resistance, and when the glass transition temperature is within the above range, there is an effect of excellent adhesion.

Further, the second acrylic polyol may have a weight average molecular weight (Mw) of 20,000 to 35,000 g/mol, or 23,000 to 30,000 g/mol. When the weight average molecular weight of the second acrylic polyol is within the above range, the appearance is excellent.

In addition, the second acrylic polyol may have a solid content of 40 to 65% by weight, or 45 to 55% by weight based on the total weight of the resin. When the solid content of the second acrylic polyol is within the above range, there is an effect of excellent coating workability.

In addition, the second acrylic polyol may be included in the composition in an amount of 1 to 10 parts by weight, or 2 to 6 parts by weight based on 15 to 25 parts by weight of the polyolefin resin. When the content of the second acrylic polyol is within the above range, acetone resistance is excellent.

3rd acrylic polyol

The third acrylic polyol serves to improve the acetone resistance of the base coat composition.

The third acrylic polyol may be directly synthesized according to a known method, or a commercially available product may be used. In this case, the third acrylic polyol may be prepared by polymerizing, for example, an acrylic monomer containing a hydroxyl group.

Examples of the hydroxyl group-containing acrylic monomer include 2-hydroxymethyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, and 2-hydroxybutyl ( Meth)acrylate, 1,3-butanediol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, ethylene glycol di(meth)acrylate and 1,6-hexanediol di(meth)acrylate It may include one or more selected from the group consisting of.

In this case, the third acrylic polyol may be prepared by polymerizing a hydroxyl group-containing acrylic monomer and a vinyl monomer as described above. The type of the vinyl monomer is not particularly limited, but, for example, styrene, methylstyrene, dimethylstyrene, fluorostyrene, ethoxystyrene, methoxystyrene, methyl (meth)acrylate, ethyl (meth)acrylate, butyl It may include at least one selected from the group consisting of (meth)acrylate and isobutyl (meth)acrylate.

In addition, the third acrylic polyol has a higher hydroxyl value and a lower glass transition temperature than the first acrylic polyol, and has a higher hydroxyl value and a lower glass transition temperature than the second acrylic polyol.

Specifically, the third acrylic polyol has a hydroxyl value (OHv) of 120 to 150 mgKOH/g, or 130 to 145 mgKOH/g, and a glass transition temperature (Tg) of 25° C. or more and less than 38° C., or 30 to 35° C. Can be When the hydroxyl value of the third acrylic polyol is within the above range, there is an excellent effect in increasing the crosslinking density, and when the glass transition temperature is within the above range, the appearance is excellent.

Furthermore, the third acrylic polyol may have a weight average molecular weight (Mw) of 10,000 to 30,000 g/mol, or 13,000 to 20,000 g/mol. When the weight average molecular weight of the third acrylic polyol is within the above range, there is an effect of excellent adhesion.

In addition, the third acrylic polyol may have a solid content of 50 to 70% by weight, or 53 to 65% by weight based on the total weight of the resin. When the solid content of the third acrylic polyol is within the above range, there is an effect of excellent moisture resistance.

In addition, the third acrylic polyol may be included in the composition in an amount of 10 to 30 parts by weight, or 18 to 25 parts by weight based on 15 to 25 parts by weight of the polyolefin resin. When the content of the third acrylic polyol is within the above range, there is an effect of excellent fragrance resistance.

In this case, the base coat composition contains the first acrylic polyol, the second acrylic polyol, and the third acrylic polyol in a weight ratio of 2.0 to 3.5: 1: 4 to 6, or 2.3 to 3.0: 1: 4.0 to 5.5 by weight. can do. When the weight ratio of the first acrylic polyol, the second acrylic polyol, and the third acrylic polyol is within the above range, there is an effect of improving sunscreen resistance and fragrance resistance.

In addition, the base coat composition may include 22 to 46 parts by weight, or 25 to 41 parts by weight of the total amount of the first acrylic polyol, the second acrylic polyol, and the third acrylic polyol based on 15 to 25 parts by weight of the polyolefin resin. When the total amount of the first acrylic polyol, the second acrylic polyol, and the third acrylic polyol is within the above range, there is an effect of improving sunscreen resistance and fragrance resistance.

The base coat composition may further include at least one selected from the group consisting of pigments, additives, and solvents.

Pigment

The pigment is not particularly limited as long as it is usually applied to a paint, and examples thereof include a matting agent and a color toning agent.

The matting agent serves to control the gloss. The matting agent is not particularly limited as long as it is a conventional one that can be used in the coating composition, and for example, silica may be used. Although there is no particular limitation on the amount of the matting agent used, for example, it may be used in the composition in an amount of 5 to 20 parts by weight, or 8 to 15 parts by weight based on 15 to 25 parts by weight of the polyolefin resin.

The toning agent serves to impart color to the prepared coating film. At this time, the colorant may be, for example, talc, calcium carbonate, titanium dioxide, iron oxide, sulfur oxide, or the like. In addition, the colorant may be included in the composition in an amount of 10 to 20 parts by weight based on 15 to 25 parts by weight of the polyolefin resin. When the content of the toning agent is within the above range, it is possible to prevent the problem of insufficient hiding power of the produced film and the problem of lowering the adhesion of the coating film.

additive

The additive is not particularly limited as long as it can be applied to a conventional paint, but examples thereof include a surface modifier, a curing accelerator, a reaction retarder, an anti-stain agent, a wax, and the like.

In this case, the additive may be included in the composition in an amount of 1 to 15 parts by weight, or 5 to 10 parts by weight based on 15 to 25 parts by weight of the polyolefin resin.

The surface modifier serves to adjust the surface tension of the composition. As the surface modifier, additives generally used in the coating composition may be used to control the surface tension, and for example, a polysiloxane-based surface modifier or a non-silicone-based surface modifier may be used. There is no particular limitation on the amount of the surface modifier to be used, and may be used in the composition in an amount of 0.01 to 1.0 parts by weight based on 15 to 25 parts by weight of the polyolefin resin. When the content of the surface modifier is less than the above content range, the appearance of the prepared coating film may be deteriorated, and when it exceeds the above content range, the recoating adhesion of the composition may be lowered.

The curing accelerator serves to increase the crosslinking density of the paint. As the curing accelerator, those generally used in paint compositions can be used to increase the degree of crosslinking, and for example, metal compounds such as dibutyltindiacetate, dibutyltindilaurate, steneas octate, dibutyltinmercaptide, etc. ; Tertiary amines such as triethyldiamine, triethanolamine, 1,4-diazocyclooctane, dimethylethanolamine, ethylmorphine, dimethylaminoethylmorpholine, and dimethylcyclohexylamine; And an alkali metal carboxylate or a zinc-based complex compound. There is no particular limitation on the amount of the curing accelerator used, but when applied in an excessive amount, it may be difficult to secure pot life.

The reaction delay agent serves to delay the pot life of the composition. At this time, the reaction delaying agent may be, for example, glycol di(3-mercaptopropionate) (GDMP, glycol di(3-mercaptopropionate)). At this time, there is no particular limitation on the amount of the reaction delaying agent, and the amount of the reaction delaying agent may be adjusted as long as the physical properties of the composition are not affected.

The anti-stain agent serves to prevent stains generated after coating the paint film. At this time, the stain inhibitor may be, for example, synthetic silica. At this time, there is no particular limitation on the amount of the stain inhibitor, and the amount may be adjusted as long as there is no effect on the physical properties of the composition.

The wax serves to improve the abrasion resistance of the coating film. The wax is not particularly limited as long as it is a conventional one that can be used in the coating composition, and examples thereof include polyolefin-based wax, fluorine-based wax, and paraffin-based wax. In addition, the wax may be included in the composition in an amount of 0.5 to 2.5 parts by weight based on 15 to 25 parts by weight of the polyolefin resin.

solvent

The solvent serves to control the thickness of the coating film and improve the workability of the coating film of the composition.

In this case, the solvent may include at least one selected from the group consisting of a non-polar solvent and a polar solvent. The non-polar solvent may be, for example, n-heptane and n-hexane, and the polar solvent may be, for example, ethyl acetate, n-butyl acetate, isobutyl acetate, ethyl ethylene glycol monoethyl ether acetate, di-salt Basic esters, 3-methoxy butyl acetate, amyl acetate, butyl glycol acetate, methyl ethyl ketone, methyl isobutyl ketone, acetone, diisobutyl ketone, isophorone, and cyclohexanone. For example, the polar solvent may include an ester-based solvent and a ketone-based solvent.

In addition, there is no particular limitation on the amount of the solvent used, but if too much of the solvent is used, a problem of lowering adhesion or durability of the composition may occur, and if too small amount is used, it is difficult to expect the effect of the use of the solvent. For example, the solvent may be included in an amount of 5 to 20 parts by weight based on 15 to 25 parts by weight of the polyolefin resin.

The base coat composition according to the present invention includes a main part including a polyolefin resin and three types of acrylic polyols as described above; And a curing agent part; may include. That is, the base coat composition may be a two-component coat composition including a main part and a hardener part.

In this case, the main part may have a viscosity of 50 to 80 KU, or 57 to 63 KU at 25° C., and may include 30 to 40% by weight, or 33 to 39% by weight of solids based on the total weight of the main part.

Hardener part

The hardener part may include a hardener and a hardener part solvent.

Furthermore, the curing agent may include a polyisocyanate compound. In addition, the type of the curing agent is not particularly limited as long as it can react with the hydroxyl group of the main part to form a urethane bond. For example, the curing agent contains at least one selected from the group consisting of homopolymers and modified products of methylene diisocyanate, toluene diisocyanate, and xylene diisocyanate, which are excellent in curing speed, adhesion, coating film hardness, and heat resistance, and are inexpensive. can do.

In the composition, the equivalent ratio of the isocyanate of the curing agent and the hydroxyl group in the main part may be 1 to 2:1. When the equivalence ratio is less than the above range, properties of the coating film such as hardness and water resistance may be deteriorated, and when the equivalent ratio exceeds the above range, the drying property of the coating film may be deteriorated.

The curing agent may be diluted with a suitable solvent and stored in a separate container, and then sufficiently stirred immediately before use.

The base coat composition according to the present invention as described above has excellent coating workability and excellent adhesion to flame-retardant materials, so that the primer process can be eliminated, and thus economical efficiency is excellent. In addition, the coating film prepared from the base coat composition is excellent in various physical properties such as appearance characteristics, moisture resistance, sunscreen resistance, and fragrance resistance.

Hereinafter, the present invention will be described in more detail through examples. However, these examples are only intended to aid understanding of the present invention, and the scope of the present invention is not limited to these examples in any sense.

[Example]

Examples 1 to 9 and Comparative Examples 1 to 6. Preparation of base coat composition

A main part was prepared using each component in the composition as described in Tables 1 and 2 below.

Thereafter, the isocyanate group of the polyisocyanate curing agent (HDI Trimer) and the hydroxyl group of the main part were mixed in an equivalent ratio of 1:1 to prepare a base coat composition. Thinner was added to the prepared base coat composition to adjust the viscosity of No. 4 Pod Cup at 25° C. to 12 to 14 seconds.

Ingredients (parts by weight) Example One 2 3 4 5 6 7 8 9 Polyolefin resin 1 22 20 - - 17 23 20 18 19 Polyolefin resin2 - - 22 - - - - - - Polyolefin resin3 - - - 20 - - - - - 1-1 acrylic polyol 10.5 12.5 - - 15 8 11 11 12.5 1-2 acrylic polyol - - 10.5 - - - - - - No. 1-3 acrylic polyol - - - 12.5 - - - - - 2-1 acrylic polyol 4.5 4.5 - - 5 3 4 4.7 5 2-2 acrylic polyol - - 4.5 - - - - - - 2-3 acrylic polyol - - - 4.5 - - - - - 3-1 acrylic polyol 22.5 22.5 - - 20 16.5 20 25 23 3-2 acrylic polyol - - 22.5 - - - - - - 3-3 acrylic polyol - - - 22.5 - - - - - Stain inhibitor 2.5 2.5 2.5 2.5 3.5 3.5 2.5 2.5 2.5 Quencher 11 11 11 11 11 12 11 11.8 11 Wax One One One One 2 2 One One One Toning agent 13.6 13.6 13.6 13.6 14.1 14.6 13.6 13.6 13.6 Reaction retardant One One One One 1.5 2 2 One One Hardening accelerator 1.4 1.4 1.4 1.4 1.4 2.4 2.4 1.4 1.4 solvent 10 10 10 10 9.5 13 12.5 10 10 Total amount 100 100 100 100 100 100 100 100 100

Ingredients (parts by weight) Comparative example One 2 3 4 5 6 Polyolefin resin 1 - 24 23.5 25.5 24.5 22 1-1 acrylic polyol 14.5 - 13 14 - - 1-4 acrylic polyol - - - - - 10.5 2-1 acrylic polyol 8.5 6.5 - 8 - - 2-4 acrylic polyol - - - - - 4.5 3-1 acrylic polyol 26.5 24.5 23 - 25 - 3-4 acrylic polyol - - - - - 22.5 Stain inhibitor 3.5 3.5 2.5 4.5 4 2.5 Quencher 12 13 11 13 12 11 Wax 2 One One 2 1.5 One Toning agent 14.6 13.6 13.6 15.6 14.6 13.6 Reaction retardant 2 One One 2 1.5 One Hardening accelerator 2.4 1.4 1.4 2.4 1.9 1.4 solvent 14 11.5 10 13 15 10 Total amount 100 100 100 100 100 100

Hereinafter, manufacturers and product names of each component used in Examples and Comparative Examples are shown in Table 3 below.

ingredient Manufacturer and product name Remark Polyolefin
Suzy 1 - Solid content: 15% by weight, maleic acid content: 1.5% by weight,
Chlorine content: 25% by weight, Mw: 75,000 g/mol,
Gardner viscosity at 25°C: A2 Polyolefin
Suzy2 - Solid content: 21% by weight, maleic acid content: 2% by weight,
Chlorine content: 28% by weight, Mw: 90,000 g/mol,
Gardner viscosity at 25°C: A Polyolefin
Suzy 3 - Solid content: 25% by weight, maleic acid content: 1% by weight,
Chlorine content: 21% by weight, Mw: 60,000 g/mol,
Gardner viscosity at 25°C: A4 1-1 acrylic polyol - Solid content: 51% by weight, OHv: 66mgKOH/g,
Tg: 41.8°C, Mw: 21,650g/mol 1-2 acrylic polyol - Solid content: 46% by weight, OHv: 60mgKOH/g,
Tg: 40.2°C, Mw: 18,120g/mol No. 1-3 acrylic polyol - Solid content: 54% by weight, OHv: 69.3mgKOH/g,
Tg: 43.7°C, Mw: 24,880g/mol 1-4 acrylic polyol - Solid content: 51% by weight, OHv: 135mgKOH/g,
Tg: 65.2°C, Mw: 22,580g/mol 2-1 acrylic polyol - Solid content: 50% by weight, OHv: 40.1mgKOH/g,
Tg: 50°C, Mw: 26,340g/mol 2-2 acrylic polyol - Solid content: 45% by weight, OHv: 35.4mgKOH/g,
Tg: 46.1°C, Mw: 23,530g/mol 2-3 acrylic polyol - Solid content: 53% by weight, OHv: 44.2mgKOH/g,
Tg: 54.5°C, Mw: 29,600g/mol 2-4 acrylic polyol - Solid content: 50% by weight, OHv: 58mgKOH/g,
Tg: 31.2°C, Mw: 25,000g/mol 3-1 acrylic polyol - Solid content: 58% by weight, OHv: 138.9mgKOH/g,
Tg: 32.4°C, Mw: 16,775g/mol 3-2 acrylic polyol - Solid content: 54% by weight, OHv: 130.6mgKOH/g,
Tg: 30°C, Mw: 13,210g/mol 3-3 acrylic polyol - Solid content: 64% by weight, OHv: 145mgKOH/g,
Tg: 34.5°C, Mw: 19,560g/mol 3-4 acrylic polyol - Solid content: 58% by weight, OHv: 18mgKOH/g,
Tg: 80.2°C, Mw: 18,000g/mol Stain inhibitor Manufacturer: EVONIC,
Product Name: AEROSIL R-972 Synthetic silica Quencher Manufacturer: PQ coporation, Product name: Gasil HP-33 Amorphous silica Wax Manufacturer: HUNGSAN HWASUNG, Product Name: HPA-405 - Toning agent Manufacturer: KCC, Product Name: YX1234K - Reaction retardant Manufacturer: THIOCHEMICALS, Product Name: CHIOCURE GDMP Glycol di(3-mercaptopropionate) Hardening accelerator Manufacturer: SONGWON, Product Name: SONGSTAB TL-100 Dibutyltindilaurate (DBTDL) solvent - Mixture of butyl acetate, methyl isobutyl ketone and ethyl acetate in a weight ratio of 1:1.6:0.2

Test Example: Evaluation of the properties of the manufactured coating film

After coating the base coat composition (dry film thickness: 17 to 23 μm) prepared in Examples and Comparative Examples on polypropylene, which is a plastic material, it was cured with hot air at 80° C. for 30 minutes to obtain a coating film. Thereafter, the coating workability of the composition, the appearance and physical properties of the coating film were measured in the following manner, and the results are shown in Table 4.

(1) Appearance

After coating the base coat composition (dry film thickness: 17-23㎛) prepared in Examples and Comparative Examples on polypropylene, which is a plastic material, curing it with hot air at 80℃ for 30 minutes to obtain a coating film. Air bubbles, foreign matter, spots, grooves, and the degree of spreadability were compared.

Specifically, if there are no bubbles, foreign matter, spots and grooves on the surface of the naked eye, and if the spreadability is good, it is excellent (◎), when there are no bubbles, foreign substances, spots and grooves on the surface of the naked eye, and if there are no bubbles, it is good (○) , If there are fine bubbles, foreign matters, spots and grooves on the visual surface and lack of spreadability, it is evaluated as normal (△), and if there are bubbles, foreign matters, spots and grooves on the surface of the naked eye and lacks spreadability, it is evaluated as defective (×). I did.

(2) Painting workability

The base coating composition was coated twice on a 30cm×40cm (width×length) tinplate using 61 IWATA guns to compare the degree of atomization, smoothness, and paint film salvage at the time of coating.

Specifically, excellent (◎) when the surface has good spreadability within the surface with the naked eye and excellent (◎), good when the surface is good, but lacks the spreadability by the naked eye (○), and is insufficient with the naked eye. If the painting foreign body occurred with less than 3 points, it was evaluated as normal (△), and when the painting foreign body was more than 3 points and cratering occurred, it was evaluated as defective (×).

(3) adhesion

According to the ASTM D3359 tape adhesion test method, the adhesion of the coating film was drawn into 100 squares (1 mm width x 1 mm length) with a blade, and peeled off using a tape to measure the adhesion.

At this time, if 100 squares are 100% fully attached, it is excellent (◎), if the remaining squares are 95% or more and less than 100%, it is good (○), if it is 90% or more and less than 95%, it is normal (△), and it is 85% or more and less than 90%. The case was evaluated as defective (×).

(4) moisture resistance

After immersing the coating film in a 40℃ thermostat for 10 days, the adhesion of the coating film was evaluated. The evaluation criteria are excellent (◎) when 100% of the 100 squares are completely attached, and good when more than 95% and less than 100% are attached (○ ), if more than 90% and less than 95% were attached, it was evaluated as normal (△), and if less than 90% was attached, it was evaluated as defective (×).

(5) Sunscreen resistance

Two sheets of white cotton cloth (Toyosynthetic CH2070-3 equivalent) of the same size were stacked on an acrylic plate (50 mm×50 mm, width×length), and 0.25 g of sun cream (NIVEA SPF47) was applied on the entire surface. Thereafter, the sunscreen application portion was put on the coating film and the acrylic plate was pressed in close contact. Thereafter, it was allowed to stand in a thermostat at 80±2° C. for 1 hour and then taken out, the white cotton cloth and the acrylic plate were removed, and then left at room temperature for 10 minutes. Thereafter, after washing with a neutral detergent and drying, the adhesion of the coating film was evaluated, and the evaluation criteria were applied in the same manner as in the above item (3).

(6) Acetone resistance

Each of isobutanol, ethanol, and methanol was applied to a cloth, and the final coating film was rubbed 10 times under a load of 500 g to evaluate acetone resistance. As a result of the test, if the film does not peel off and does not discolor, it is excellent (◎), if the film does not come off and is GREY SCALE grade 4 (○), if the film does not come off and is gray scale grade 3, it is normal (△), the film is peeled off or gray scale 2 If it is below grade, it was evaluated as defective (×).

(7) Fragrance resistance

An aluminum cap with a diameter of 20 mm was attached to the surface of the coating film using an adhesive, and 0.2 ml of fragrance evaluation solution (ISOAMLYL ACETATE: limonene: linalool = 4:1:1 by volume) The mixed solution) was dropped into the inside of the aluminum cap using a dropper and left at room temperature for 5 minutes. Then, after leaving it to stand for 30 minutes in a thermostat at 70±2° C., it was taken out, and the attached aluminum cap was removed, and then the surface of the coating film was visually inspected.

As a result of the test, the coating film has no visible wrinkles, and even when the coating film is touched by hand, it is excellent if there are no wrinkles (◎). If fine wrinkles occurred, it was evaluated as normal (△), and if the wrinkles were very severe, it was evaluated as bad (x).

Painting workability Exterior Adherence Moisture resistance Sunscreen resistance Acetone resistance Fragrance resistance Example One ◎ ◎ ◎ ◎ ◎ ◎ ◎ 2 ◎ ◎ ○ ○ ◎ ◎ ◎ 3 ◎ ◎ ◎ ◎ ◎ ◎ ○ 4 ◎ ◎ ○ ○ ○ ◎ ◎ 5 ○ ◎ ○ ○ ○ ◎ ○ 6 ○ ○ ◎ ◎ ○ ◎ ○ 7 ○ ○ ◎ ◎ ◎ ◎ ◎ 8 ◎ ◎ ○ ○ ○ ◎ ◎ 9 ○ ◎ ○ ○ ○ ◎ ○ Comparative example One ○ ○ X X X X X 2 X X ◎ ◎ ◎ ◎ ◎ 3 ○ X ◎ △ ◎ △ ◎ 4 ◎ ◎ ◎ ◎ ◎ ◎ X 5 ◎ ◎ ○ △ △ X X 6 ◎ ◎ ◎ △ X △ X

As shown in Table 4, the base coat compositions of Examples 1 to 9 have excellent coating workability, and the coating film prepared therefrom has appearance characteristics, adhesion, moisture resistance, sunscreen resistance, acetone resistance, and fragrance resistance. This was excellent.

On the other hand, the coating films prepared from the base coat compositions of Comparative Examples 1 to 6 lacked fragrance resistance and appearance characteristics.

Claims (6)

Including a polyolefin resin, a first acrylic polyol, a second acrylic polyol and a third acrylic polyol,
The first acrylic polyol has a higher hydroxyl value and a lower glass transition temperature than the second acrylic polyol,
The third acrylic polyol has a higher hydroxyl value and a lower glass transition temperature than the first acrylic polyol, the base coat composition. The method according to claim 1,
The first acrylic polyol has a hydroxyl value of 50 to 70 mgKOH/g,
The second acrylic polyol has a hydroxyl value of 20 mgKOH/g or more and less than 50 mgKOH/g,
The third acrylic polyol has a hydroxyl value of 120 to 150 mgKOH/g, a base coat composition. The method according to claim 1,
The first acrylic polyol has a glass transition temperature of 38 to 45 °C,
The second acrylic polyol has a glass transition temperature of more than 45°C and not more than 60°C,
The third acrylic polyol has a glass transition temperature of 25° C. or more and less than 38° C., a base coat composition. The method according to claim 1,
The composition comprises a first acrylic polyol, a second acrylic polyol, and a third acrylic polyol in a weight ratio of 2.0 to 3.5: 1: 4 to 6, the base coat composition. The method according to claim 1,
The polyolefin resin has a weight average molecular weight of 50,000 to 100,000 g/mol, a chlorine content of 10 to 35 wt% based on the total weight of the resin, and an unsaturated fatty acid content of 0.5 to 5 wt% based on the total weight of the resin, the base Coat composition. The method according to claim 1,
The composition comprises 22 to 46 parts by weight of the total amount of the first acrylic polyol, the second acrylic polyol, and the third acrylic polyol based on 15 to 25 parts by weight of the polyolefin resin.