KR102349182B1 - Coating composition for pre-coated metal having heat radiation function and pre-coated metal sheet using the same - Google Patents

Coating composition for pre-coated metal having heat radiation function and pre-coated metal sheet using the same Download PDF

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KR102349182B1
KR102349182B1 KR1020200072308A KR20200072308A KR102349182B1 KR 102349182 B1 KR102349182 B1 KR 102349182B1 KR 1020200072308 A KR1020200072308 A KR 1020200072308A KR 20200072308 A KR20200072308 A KR 20200072308A KR 102349182 B1 KR102349182 B1 KR 102349182B1
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resin
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pcm
total composition
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KR20210155423A (en
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노진균
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포스코강판 주식회사
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/013—Fillers, pigments or reinforcing additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/10—Metal compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
    • C08L75/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
    • C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
    • C08K2003/309—Sulfur containing acids

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Abstract

본 발명은 방열기능을 갖는 피씨엠용 도료 조성물 및 이에 의해 제조된 피씨엠 도장강판에 관한 것으로서, 기존의 도장 시스템과 동등한 물성을 유지하면서 높은 방열성능을 갖는 피씨엠용 도료 조성물을 제공하는 데 그 목적이 있다.
이를 위하여 본 발명은, 주성분인 수지와, 가교제, 경화 촉매, 용제 및 첨가제를 포함하여 이루어지는 피씨엠(PCM: Pre-Coated Metal)용 도료 조성물에 있어서, 상기 수지는 폴리에스터 수지로서, 유연성을 향상시켜 가공성을 높이기 위한 A수지와, 소지강판과의 부착성을 향상시키기 위한 B수지로 이루어지고, 상기 A수지는, 분자량 15,000 ∼ 20,000, 수산가 20 ∼ 40mgKOH/g, 산가 1∼5 mgKOH/g, 유리전이온도 10 ∼ 20℃로서 전체 조성물에 대하여 15 ∼ 30중량% 함유되고, 상기 B수지는, 방향족 성분이 40 ~ 60중량%이고, 중량평균 분자량 30,000 ∼ 35,000, 수산가 10 ∼ 30mgKOH/g, 산가 1∼3 mgKOH/g, 유리전이온도 25 ∼ 35℃로서 전체 조성물에 대하여 15 ∼ 30중량% 함유되며, 방열성능을 향상시키기 위한 필러(Filler)로서, 6개의 탄소 원자 고리를 갖는 그래파이트(Graphite)가 전체 조성물에 대하여 1.0 ~ 2.0중량% 함유되는 것을 특징으로 한다.The present invention relates to a coating composition for PCM having a heat dissipation function and a PCM coated steel sheet manufactured thereby, and the purpose of the present invention is to provide a coating composition for PCM having high heat dissipation performance while maintaining physical properties equivalent to those of an existing coating system. have.
To this end, the present invention provides a paint composition for PCM (Pre-Coated Metal) comprising a resin as a main component, a crosslinking agent, a curing catalyst, a solvent and an additive, wherein the resin is a polyester resin, and the flexibility is improved It consists of a resin A for increasing workability and resin B for improving adhesion with a base steel sheet, and the resin A has a molecular weight of 15,000 to 20,000, a hydroxyl value of 20 to 40 mgKOH/g, an acid value of 1 to 5 mgKOH/g, The glass transition temperature is 10 to 20 ° C., and 15 to 30 wt % is contained with respect to the total composition, and the B resin has an aromatic component of 40 to 60 wt %, a weight average molecular weight of 30,000 to 35,000, a hydroxyl value of 10 to 30 mgKOH/g, an acid value 1-3 mgKOH/g, glass transition temperature of 25-35 ℃, containing 15-30% by weight based on the total composition, as a filler for improving heat dissipation performance, graphite having 6 carbon atom rings It is characterized in that it is contained in an amount of 1.0 to 2.0% by weight based on the total composition.

Description

방열기능을 갖는 피씨엠용 도료 조성물 및 이에 의해 제조된 피씨엠 도장강판{COATING COMPOSITION FOR PRE-COATED METAL HAVING HEAT RADIATION FUNCTION AND PRE-COATED METAL SHEET USING THE SAME}Coating composition for PCM having heat dissipation function and PCM coated steel sheet manufactured thereby

본 발명은 방열기능을 갖는 피씨엠용 도료 조성물 및 이에 의해 제조된 피씨엠 도장강판에 관한 것으로서, 더욱 상세하게는, 세트 박스(Set Box)나 자동차 부품에 사용되는 방열판 제조시에 방열기능을 부여하는 피씨엠 도료를 도포함으로써, 방열성을 향상시킴과 동시에 유연성 및 부착성을 향상시킬 수 있는 피씨엠용 도료 조성물 및 이에 의해 제조된 피씨엠 도장강판에 관한 것이다. The present invention relates to a paint composition for PCM having a heat dissipation function and a PCM coated steel sheet manufactured thereby, and more particularly, to a heat dissipation function that imparts a heat dissipation function when manufacturing a set box or a heat sink used for automobile parts. The present invention relates to a paint composition for PCM capable of improving heat dissipation and at the same time improving flexibility and adhesion by applying the PCM paint, and a PCM coated steel sheet manufactured thereby.

강판을 도장하는 방식으로, 강판을 성형 가공한 후에 도장하는 포스트 코팅(Post-Coating) 방식과, 성형 가공하기 전에 도장하는 프리 코팅(Pre-Coating) 방식이 있다.As a method of painting the steel sheet, there are a post-coating method of painting the steel sheet after forming and processing, and a pre-coating method of painting the steel sheet before forming and processing.

상기 포스트 코팅 방식은, 설비비가 저렴하고 소량 생산에 유리하지만 균일한 제품의 생산 및 대량 생산이 어렵다는 단점이 있다.The post-coating method is advantageous for low-cost equipment and small-volume production, but has a disadvantage in that it is difficult to produce uniform and mass-produced products.

이에 비하여 프리 코팅 방식은, 균일한 제품을 생산할 수 있고 도료의 손실이 적으며 단시간 내에 대량 생산이 가능하다는 장점이 있다.On the other hand, the pre-coating method has advantages in that a uniform product can be produced, a loss of paint is small, and mass production is possible within a short time.

상기한 프리 코팅 방식으로 도장한 강판을 통상 피씨엠(Pre-Coated Metal) 도장강판이라 하고, 여기에 사용되는 도료를 피씨엠 도료라 한다.A steel sheet coated with the above pre-coating method is usually referred to as a PCM (Pre-Coated Metal) coated steel sheet, and the paint used here is referred to as a PCM paint.

또한 피씨엠 도장강판은, 통상적으로 2회의 도장 및 건조 과정을 거치는 2C-2B(2Coating-2Baking) 방식에 의해 제조된다.In addition, the PCM coated steel sheet is usually manufactured by the 2C-2B (2Coating-2Baking) method, which undergoes two coating and drying processes.

상기한 2C-2B 방식은, 도막의 가공성과 외관 등의 물성 면에서 소비자의 요구에 부응할 수 있는 최적의 도장 시스템으로 알려져 있다. The above-described 2C-2B method is known as an optimal coating system that can meet the needs of consumers in terms of physical properties such as processability and appearance of the coating film.

그런데 종래의 피씨엠 도료를 적용한 도장강판은, 방열기능을 구비하고 있지 아니하여 높은 방열성이 요구되는 세트 박스나 자동차용 부품의 방열판 소재로 사용하기에 적합하지 않다. However, the conventional coated steel sheet to which the PCM paint is applied does not have a heat dissipation function, so it is not suitable for use as a material for a heat dissipation plate for a set box or automobile parts requiring high heat dissipation.

이에 따라 높은 방열성을 갖는 피씨엠용 도료 조성물 및 방열판 제조용 피씨엠 도장강판이 요구되고 있다. Accordingly, there is a demand for a paint composition for PCM having high heat dissipation properties and a PCM coated steel sheet for manufacturing a heat sink.

국내 공개특허 제10-2020-0059364호(2020. 5. 29. 공개)Domestic Patent Publication No. 10-2020-0059364 (published on May 29, 2020) 국내 공개특허 제10-2020-0037927호(2020. 4. 10. 공개)Domestic Patent Publication No. 10-2020-0037927 (published on April 10, 2020) 국내 공개특허 제10-2015-0036883호(2015. 4. 8. 공개)Domestic Patent Publication No. 10-2015-0036883 (published on April 8, 2015)

본 발명은 상기한 종래기술의 문제점을 해결하기 위해 제안하는 것으로서, 높은 방열성능을 확보할 수 있도록 하는 피씨엠용 도료 조성물을 제공하는 데 그 목적이 있다.The present invention is proposed to solve the problems of the prior art, and an object of the present invention is to provide a paint composition for PCM that can secure high heat dissipation performance.

본 발명의 다른 목적은, 기존의 도장 시스템과 동등한 물성을 유지하면서도 높은 방열성능을 갖는 피씨엠용 도료 조성물을 제공하는 데 있다.Another object of the present invention is to provide a paint composition for PCM having high heat dissipation performance while maintaining physical properties equivalent to those of a conventional painting system.

본 발명의 또 다른 목적은, 박막 도장에 의해서도 방열성능을 확보할 수 있는 피시엠용 도료 조성물을 제공하는데 있다. Another object of the present invention is to provide a paint composition for PCM that can secure heat dissipation performance even by thin film coating.

상기한 목적을 달성하기 위하여 본 발명은, 주성분인 수지와, 가교제, 경화 촉매, 용제 및 첨가제를 포함하여 이루어지는 피씨엠(PCM: Pre-Coated Metal)용 도료 조성물에 있어서, 상기 수지는 폴리에스터 수지로서, 유연성을 향상시켜 가공성을 높이기 위한 A수지와, 소지강판과의 부착성을 향상시키기 위한 B수지로 이루어지는 것을 특징으로 한다.In order to achieve the above object, the present invention provides a paint composition for PCM (Pre-Coated Metal) comprising a resin as a main component, a crosslinking agent, a curing catalyst, a solvent and an additive, wherein the resin is a polyester resin As, it is characterized in that it is composed of a resin A for improving workability by improving flexibility, and resin B for improving adhesion to a base steel sheet.

또한 상기 A수지는, 분자량 15,000 ∼ 20,000, 수산가 20 ∼ 40mgKOH/g, 산가 1∼5 mgKOH/g, 유리전이온도 10 ∼ 20℃로서 전체 조성물에 대하여 15 ∼ 30중량% 함유되고, 상기 B수지는, 방향족 성분이 40 ~ 60중량%이고, 중량평균 분자량 30,000 ∼ 35,000, 수산가 10 ∼ 30mgKOH/g, 산가 1∼3 mgKOH/g, 유리전이온도 25 ∼ 35℃로서 전체 조성물에 대하여 15 ∼ 30중량% 함유되는 것을 특징으로 한다.In addition, the A resin has a molecular weight of 15,000 to 20,000, an acid value of 20 to 40 mgKOH/g, an acid value of 1 to 5 mgKOH/g, and a glass transition temperature of 10 to 20 ° C. 15 to 30 wt% of the total composition is contained, and the B resin is , an aromatic component of 40 to 60% by weight, a weight average molecular weight of 30,000 to 35,000, a hydroxyl value of 10 to 30 mgKOH/g, an acid value of 1 to 3 mgKOH/g, and a glass transition temperature of 25 to 35° C. of 15 to 30% by weight relative to the total composition It is characterized in that it contains

또한 방열성능을 향상시키기 위한 필러(Filler)로서, 6개의 탄소 원자 고리를 갖는 그래파이트(Graphite)가 전체 조성물에 대하여 1.0 ~ 2.0중량% 함유되는 것을 특징으로 한다.In addition, as a filler for improving heat dissipation performance, graphite having 6 carbon atom rings is contained in an amount of 1.0 to 2.0% by weight based on the total composition.

또한 상기 A수지는, 도막의 가공성을 향상시키기 위해, 분자 구조 내에 프로판디올(Propanediol), 1,6-헥산디올(Hexanediol), 1,4-부탄디올(Butanediol) 중 어느 하나의 모노머가 A수지 내에 25 ~ 40중량% 함유되어 있는 것을 특징으로 한다.In addition, in the resin A, in order to improve the processability of the coating film, any one of the monomers of propanediol, 1,6-hexanediol, and 1,4-butanediol in the molecular structure is contained in the resin A. It is characterized in that it contains 25 to 40% by weight.

또한 상기 가교제는, 메톡시기를 갖는 메틸에테르화 멜라민 수지가 4 ∼ 7 중량%, 우레탄 가교제가 1 ∼ 3중량% 함유되어 있는 것을 특징으로 한다.In addition, the crosslinking agent is characterized in that 4 to 7% by weight of a methyl etherified melamine resin having a methoxy group, and 1 to 3% by weight of a urethane crosslinking agent are contained.

또한 상기 경화 촉매는, p-톨루엔 술폰산(p-TSA), 디노닐나프탈렌 술폰산(DNNSA), 디나프탈렌 디술폰산(DNNDSA), 플루오로 술폰산 중에서 선택된 어느 하나의 술폰산을 2차 아민 또는 에폭시로 중화시켜 얻은 중화 생성물로서, 우레탄 가교 결합을 위해 Tin촉매(DBTDL)를 적용하고, 전체 조성물을 기준으로 0.5 ~ 2.0중량% 함유되는 것을 특징으로 한다.In addition, the curing catalyst may be obtained by neutralizing any one sulfonic acid selected from p-toluene sulfonic acid (p-TSA), dinonylnaphthalene sulfonic acid (DNNSA), dinaphthalene disulfonic acid (DNNDSA), and fluorosulfonic acid with a secondary amine or epoxy. As the obtained neutralization product, a Tin catalyst (DBTDL) is applied for urethane crosslinking, and it is characterized in that it is contained in an amount of 0.5 to 2.0% by weight based on the total composition.

본 발명에 의하면, 방열판용 블랙(Black) 도료의 필러(Filler)로 6개의 탄소 원자 고리를 가진 방열 그래파이트(Graphite)를 도입함으로써 방열판의 방열성능을 향상시킬 수 있는 효과가 있다.According to the present invention, there is an effect of improving the heat dissipation performance of the heat sink by introducing heat dissipation graphite having 6 carbon atom rings as a filler of the black paint for the heat sink.

또한 기존의 도장 시스템과 동등한 물성을 유지하면서 높은 방열성능을 갖도록 할 수 있는 효과가 있다. In addition, there is an effect that can have high heat dissipation performance while maintaining the same physical properties as the existing coating system.

또한 지방족 타입의 수지를 사용함으로써 일반 도료에 비해 유연성을 향상시킬 수 있고, 수지의 분자량을 최대한 증가시켜 소지강판과의 부착력을 향상시킬 수 있는 효과가 있다. In addition, by using an aliphatic type resin, it is possible to improve flexibility compared to general paints, and to increase the molecular weight of the resin as much as possible to improve adhesion with the base steel sheet.

또한 종래의 피씨엠 도료의 일반적인 도막 두께(20~30㎛)에 비해 13~17㎛의 얇은 도막을 형성하면서도 방열효과를 발휘할 수 있는 효과가 있다. In addition, there is an effect of exhibiting a heat dissipation effect while forming a thin film of 13 to 17 µm compared to the general thickness (20 to 30 µm) of conventional PCM paints.

도 1은 본 발명에 따라 제조된 피씨엠 도장강판의 단면도.1 is a cross-sectional view of a PCM coated steel sheet manufactured according to the present invention.

본 발명자들은 외관, 가공성, 부착성, 방열성을 동시에 만족시킬 수 있는 방열판용 블랙 피씨엠 도료 조성물 개발을 위해 많은 노력을 기울여 왔다.The present inventors have made a lot of effort to develop a black PCM paint composition for a heat sink that can simultaneously satisfy appearance, workability, adhesion, and heat dissipation properties.

그 결과, 기존 도료에 비해 수지 백본(Backbone)의 유연성을 최대한 증가시켜 가공성을 높인 A수지와, 분자량을 기존 수지보다 2~3배 증가시킨 B수지를 조합하고, 필러로서 방열기능이 우수한 그래파이트(Graphite)를 적용할 경우에, 가공성, 부착성이 향상됨과 동시에 방열성능이 크게 향상됨을 확인할 수 있었다.As a result, resin A, which has improved processability by maximally increasing the flexibility of the resin backbone compared to existing paints, and resin B, which has increased molecular weight by 2 to 3 times compared to existing resins, is combined, and graphite ( Graphite), it was confirmed that the workability and adhesion were improved, and the heat dissipation performance was greatly improved.

또한 수지는 지방족 타입의 원료를 사용하여 유연성을 극대화시킴으로써 가공성 문제를 해결하였고, 분자량을 최대한 증가시켜 부착성이 향상되도록 하였다.In addition, the resin used an aliphatic type raw material to maximize flexibility to solve the processability problem, and to increase the molecular weight as much as possible to improve adhesion.

그리고 본 발명에 따른 방열판용 피씨엠 도장강판은, 도 1에 도시된 바와 같이, 소지강판(10)의 양면에 전처리층(20)이 형성되고, 상기 전처리층(20)의 일면에 하도 도막층(30)과 상도 도막층(40)이 차례로 형성되며, 전처리층(20)의 타면에는 배면층(50)이 형성되는 구조를 갖는다.And in the PCM coated steel sheet for a heat sink according to the present invention, as shown in FIG. 1 , a pretreatment layer 20 is formed on both sides of the base steel sheet 10 , and an undercoat layer is formed on one surface of the pretreatment layer 20 . 30 and the top coat layer 40 are sequentially formed, and the back surface layer 50 is formed on the other surface of the pretreatment layer 20 .

이하 본 발명에 따른 피씨엠 도료 조성물의 각 성분에 대하여 설명한다.Hereinafter, each component of the PCM paint composition according to the present invention will be described.

<폴리에스테르 수지> <Polyester resin>

본 발명에 따른 폴리에스테르 수지는, 유연성 강화를 위한 A수지와, 부착성 강화를 위한 B수지로 이루어진다.The polyester resin according to the present invention consists of a resin A for reinforcing flexibility and a resin B for reinforcing adhesion.

상기 A수지는, 중량평균 분자량 15,000 ∼ 20,000, 수산가 20 ∼ 40mgKOH/g, 산가 1 ∼ 5 mgKOH/g, 유리전이온도 10 ∼ 20℃인 것을 사용하는 것이 바람직하다. It is preferable to use the resin A having a weight average molecular weight of 15,000 to 20,000, an acid value of 20 to 40 mgKOH/g, an acid value of 1 to 5 mgKOH/g, and a glass transition temperature of 10 to 20°C.

A수지의 중량평균 분자량이 15,000 미만이 되면 도막의 가공성 및 내구성을 유지할 수 없고, 20,000을 초과하게 되면 작업성이 저하되는 문제가 있다.When the weight average molecular weight of the resin A is less than 15,000, the workability and durability of the coating film cannot be maintained, and when it exceeds 20,000, there is a problem in that workability is reduced.

또한 상기 A수지는 전체 조성물에 대하여 15 ∼ 30중량% 함유되는 것이 바람직하다.In addition, the A resin is preferably contained in an amount of 15 to 30% by weight based on the total composition.

상기 A수지의 함량이 15중량% 미만이 되면 유연성이 저하되고, 30중량%를 초과하면 작업성이 저하된다.When the content of the resin A is less than 15% by weight, flexibility is lowered, and when it exceeds 30% by weight, workability is reduced.

또한 도막의 가공성을 유지하기 위해, 상기 A수지의 분자구조 내에 프로판디올(Propanediol), 1,6-헥산디올(Hexanediol), 1,4-부탄디올(Butanediol) 중 어느 하나의 모노머(Monomer)가 25 ~ 40중량% 함유되는 것이 바람직하다.In addition, in order to maintain the processability of the coating film, any one of propanediol, 1,6-hexanediol, and 1,4-butanediol is 25 in the molecular structure of the resin A. It is preferable to contain ~ 40% by weight.

상기 모노머의 함량이 25중량% 미만이 되면 도막의 가공성 및 내구성 유지가 어렵고, 40중량%를 초과하면 작업성이 저하된다. When the content of the monomer is less than 25% by weight, it is difficult to maintain the workability and durability of the coating film, and when it exceeds 40% by weight, workability is deteriorated.

그리고 본 발명에 따른 B수지는, 전체 배합에서 방향족 성분이 40 ~ 60중량%이고, 중량평균 분자량 30,000 ∼ 35,000, 수산가 10 ∼ 30mgKOH/g, 산가 1∼3 mgKOH/g, 유리전이온도 25 ∼ 35℃인 것이 바람직하다.And the B resin according to the present invention has an aromatic component of 40 to 60% by weight in the total formulation, a weight average molecular weight of 30,000 to 35,000, a hydroxyl value of 10 to 30 mgKOH/g, an acid value of 1 to 3 mgKOH/g, and a glass transition temperature of 25 to 35 It is preferable that it is °C.

상기 B수지는 전체 조성물에 대하여 15 ∼ 30중량% 함유되는 것이 바람직하다.The B resin is preferably contained in an amount of 15 to 30% by weight based on the total composition.

상기 B수지의 함량이 15중량% 미만이 되면 도막의 부착성을 유지하기가 어렵게 되고, 30중량%를 초과하면 작업성이 저하된다.When the content of the resin B is less than 15% by weight, it is difficult to maintain the adhesion of the coating film, and when it exceeds 30% by weight, workability is deteriorated.

또한 상기 A수지와 B수지가 혼합된 혼합수지의 함량은, 전체 도료 조성물에 대하여 30 ∼ 60 중량%인 것이 바람직하다.In addition, the content of the mixed resin in which the resin A and the resin B are mixed is preferably 30 to 60% by weight based on the total coating composition.

상기 혼합수지의 함량이 30중량% 미만이면 도막의 가공성 및 부착성이 저하되고, 60중량%를 초과하면 도료 내에 수지분이 지나치게 많아져 도막의 건조도가 저하되는 문제가 있다. When the content of the mixed resin is less than 30% by weight, the processability and adhesion of the coating film are deteriorated, and when it exceeds 60% by weight, there is a problem in that the resin content in the coating material is excessively increased and the dryness of the coating film is decreased.

아래의 [표 1]은 A수지의 실시예 및 비교예를 나타낸 것이다.[Table 1] below shows Examples and Comparative Examples of Resin A.

A수지의 실시예 및 비교예Examples and comparative examples of resin A 구 분 division 1실시예Example 1 2실시예Example 2 3실시예Example 3 4실시예Example 4 비교예(기존 수지)Comparative example (existing resin)

알코올

Alcohol EGEG 5.05.0 5.05.0 3.03.0 3.03.0 NPGNPG 14.014.0 12.012.0 12.012.0 9.09.0 34.034.0 1,6HD1,6HD 26.026.0 3030 6.06.0 PDPD 28.028.0 30.030.0
산
Mountain IPAIPA 32.032.0 37.037.0 25.025.0 35.035.0 35.035.0 TPATPA 15.015.0 18.018.0 20.020.0 2323 5.05.0 AAAA 8.08.0 10.010.0 2020 첨가제additive DBTODBTO 0.10.1 0.10.1 0.10.1 0.10.1 0.10.1 희석용제diluent CH/K150=4/6CH/K150=4/6 비중importance 1.051.05 1.051.05 1.051.05 1.051.05 1.051.05 점도Viscosity WW XX WW XX XX 고형분solid content 50.350.3 50.750.7 50.250.2 60.060.0 60.060.0 산가acid 2.52.5 2.12.1 2.12.1 5.05.0 5.05.0 분자량Molecular Weight 17,00017,000 17,00017,000 18,00018,000 15,00015,000 12,00012,000 수산기값hydroxyl value 2929 2828 2727 2626 4040 NPG:네오펜틸글리콜, EG:에틸렌글리콜, 1,6HD:1,6헥산디올, PD:프로판디올
IPA:이소프탈산, TPA:테레프탈산, AA:아디핀산
점도:50%용액(25℃ 가드너)
분자량: 중량평균분자량(GPC)NPG: neopentyl glycol, EG: ethylene glycol, 1,6HD: 1,6 hexanediol, PD: propanediol
IPA:isophthalic acid, TPA:terephthalic acid, AA:adipic acid
Viscosity: 50% solution (25℃ Gardner)
Molecular Weight: Weight Average Molecular Weight (GPC)

또한 아래의 [표 2]는 B수지의 실시예를 나타낸 것이다.In addition, [Table 2] below shows examples of B resin.

B수지의 실시예Example of B resin 구 분 division 1실시예Example 1 2실시예Example 2 3실시예Example 3 4실시예Example 4 비교예comparative example 알코올Alcohol EGEG 2.02.0 2.02.0 2.02.0 NPGNPG 10.010.0 14.014.0 13.013.0 20.020.0 34.034.0 1,6HD1,6HD 2727 25.025.0 25.025.0 18.018.0 6.06.0 TMPTMP 1.01.0 1.01.0 1.01.0 산Mountain IPAIPA 33.033.0 34.034.0 30.030.0 35.035.0 35.035.0 TPATPA 20.020.0 21.021.0 23.023.0 19.019.0 5.05.0 AAAA 7.07.0 5.05.0 7.07.0 6.06.0 2020 첨가제additive Fascat4100Fascat4100 0.10.1 0.10.1 0.10.1 0.10.1 희석 용제dilute solvent K100/PMA=1/1K100/PMA=1/1 비중importance 1.051.05 1.051.05 1.051.05 1.051.05 1.051.05 점도Viscosity Z3Z3 Z4Z4 Z3Z3 Z4+Z4+ XX 고형분solid content 40.040.0 40.240.2 40.140.1 40.540.5 60.060.0 산가acid 1.51.5 1.61.6 1.11.1 1.21.2 5.05.0 분자량Molecular Weight 34,20034,200 33,90033,900 33,50033,500 33,60033,600 12,00012,000 수산기값hydroxyl value 1818 2020 1919 2020 4040 NPG:네오펜틸글리콜, EG:에틸렌글리콜, 1,6HD:1,6헥산디올, TMP:트리메칠올프로판
IPA:이소프탈산, TPA:테레프탈산, AA:아디핀산
점도:40%용액(25℃ 가드너)
분자량: 중량평균분자량(GPC)NPG: neopentyl glycol, EG: ethylene glycol, 1,6HD:1,6 hexanediol, TMP: trimethylolpropane
IPA:isophthalic acid, TPA:terephthalic acid, AA:adipic acid
Viscosity: 40% solution (25℃ Gardner)
Molecular Weight: Weight Average Molecular Weight (GPC)

그리고 아래의 [표 3]은 기존의 상도형 수지와, A수지, B수지의 물성을 나타낸 것이다.And [Table 3] below shows the physical properties of the existing topcoat resin, A resin, and B resin.

기존 상도형 수지, A수지, B수지의 물성 비교Comparison of physical properties of existing topcoat resin, A resin, and B resin 구 분division 기존 상도형 수지Existing top coat resin A수지A resin B수지B resin 고형분(%)Solid content (%) 6060 5050 4040 점도Viscosity V-XV-X W-YW-Y Z3-Z5Z3-Z5 분자량Molecular Weight 11,000-13,00011,000-13,000 15,000-20,00015,000-20,000 25,000-30,00025,000-30,000 수산기값hydroxyl value 10-6010-60 20-4020-40 10-3010-30 TgTg 20-40℃20-40℃ 10-20℃10-20℃ 25-35℃25-35℃

위 표를 살펴보면, 본 발명에 따른 A수지와 B수지는 기존의 상도형 수지와 비교할 때 고형분이 적고 분자량이 증가 되었음을 확인할 수 있다.Looking at the table above, it can be seen that the resin A and the resin B according to the present invention have a small solid content and an increased molecular weight compared to the conventional topcoat resin.

<가교제> <crosslinking agent>

본 발명에서는 상기한 수지 성분에 도막을 형성하기 위한 가교제로서, 멜라민 수지와 이소시아네이트 수지를 동시에 적용하였다. In the present invention, as a crosslinking agent for forming a coating film on the above-mentioned resin component, a melamine resin and an isocyanate resin were simultaneously applied.

기존의 피씨엠 도료에 적용되는 대부분의 가교제는 멜라민 수지인데, 멜라민 수지를 단독으로 적용할 경우, 도막 강도는 우수하나 도막의 가공성 및 부착성이 상대적으로 취약하게 된다.Most of the crosslinking agents applied to the existing PCM paints are melamine resins. When melamine resins are applied alone, the coating film strength is excellent, but the processability and adhesion properties of the coating films are relatively weak.

반면에 이소시아네이트 수지를 단독으로 적용하게 되면, 가공성 및 부착성은 우수하나 상대적으로 도막 경도가 저하되는 단점이 있다.On the other hand, when the isocyanate resin is applied alone, the processability and adhesion are excellent, but there is a disadvantage in that the hardness of the coating film is relatively lowered.

이에 본 발명은, 산촉매 적용 시 경화 반응속도가 빠르고 경화 반응성이 우수한 메톡시 멜라민 수지를 적용함과 동시에, 메톡시 멜라민 수지와 블록된(Blocked) 이소시아네이트 수지를 1 : 0.2 ~ 0.4의 비율로 혼합하여 사용하였다.Accordingly, the present invention applies a methoxy melamine resin having a fast curing reaction rate and excellent curing reactivity when applying an acid catalyst, and mixing a methoxy melamine resin and a blocked isocyanate resin in a ratio of 1: 0.2 to 0.4. was used.

상기 두 경화제 수지의 혼합비가 1 : 0.2 미만일 경우에는 도막의 가공성 및 부착성이 저하되는 단점이 있고, 1 : 0.4를 초과할 경우에는 도막의 표면 경화가 저하되는 단점이 있다.When the mixing ratio of the two curing agent resins is less than 1:0.2, the processability and adhesion of the coating film are deteriorated, and when it exceeds 1:0.4, there is a disadvantage in that the surface hardening of the coating film is reduced.

<경화 촉매><curing catalyst>

경화 촉매는, p-톨루엔 술폰산(p-TSA), 디노닐나프탈렌 술폰산(DNNSA), 디나프탈렌 디술폰산(DNNDSA), 플루오로 술폰산 중에서 선택된 어느 하나의 술폰산을 아민 또는 에폭시로 중화시킨 것을 사용하는 것이 바람직하다.The curing catalyst is one obtained by neutralizing any one sulfonic acid selected from p-toluene sulfonic acid (p-TSA), dinonylnaphthalene sulfonic acid (DNNSA), dinaphthalene disulfonic acid (DNNDSA), and fluorosulfonic acid with an amine or epoxy. desirable.

또한 우레탄 가교결합을 위해 Tin촉매(DBTDL: Dibutyltin Dilaurate)를 사용하는 것이 바람직하다. It is also preferable to use a Tin catalyst (DBTDL: Dibutyltin Dilaurate) for urethane crosslinking.

상기 경화 촉매는, 전체 도료 조성물에 대하여 0.5 ∼ 2.0중량% 함유되는 것이 바람직하다. It is preferable that the said curing catalyst contains 0.5 to 2.0 weight% with respect to the total coating composition.

<방열 필러(Filler)><Heat dissipation filler>

본 발명은 방열성능을 확보하기 위해, 방열성능이 우수한 그래파이트(Graphite)를 적용하였다.In the present invention, graphite having excellent heat dissipation performance is applied to secure heat dissipation performance.

상기 그래파이트는, 열이나 전기가 통하는 도체로서, 불에 강하고 산에 녹지 않는 다는 특징이 있어, 전극, 도가니, 내화 벽돌, 녹 방지제 등에 사용되고 있다.The graphite, as a conductor through which heat or electricity passes, has the characteristics of being strong in fire and insoluble in acid, and is used in electrodes, crucibles, fire bricks, rust inhibitors, and the like.

상기 그래파이트 필러는, 전체 조성물을 기준으로 1.0 ~ 2.0중량% 함유되는 것이 바람직하다. The graphite filler is preferably contained in an amount of 1.0 to 2.0% by weight based on the total composition.

<용제> <solvent>

본 발명의 피씨엠 도료 조성물은, 취급 및 피복 작업 시의 특성 등을 고려하여 적당량의 유기 용제를 함유한다. The PCM paint composition of the present invention contains an appropriate amount of an organic solvent in consideration of characteristics during handling and coating work.

상기 유기 용제로는, 방향족 탄화 수소계, 글리콜 에스테르계, 글리콜 에테르계, 알코올계 용제 등을 적절히 혼합하여 사용한다. As said organic solvent, an aromatic hydrocarbon type, glycol ester type, glycol ether type, alcohol type solvent, etc. are mixed and used suitably.

상기 방향족 탄화 수소계 용제로는 SK사의 코코졸 #100, 코코졸 #150, 글리콜 에스테르계 용제로는 유니온 카바이드사의 에틸 아세테이트, n-부틸 아세테이트, 셀로솔브 아세테이트, 프로필렌 글리콜 모노메틸 아세테이트, 3-메톡시 부틸 아세테이트를 사용할 수 있다. The aromatic hydrocarbon-based solvents include SK's Cocosol #100, Cocosol #150, and the glycol ester-based solvents include Union Carbide's ethyl acetate, n-butyl acetate, Cellosolve acetate, propylene glycol monomethyl acetate, 3-Me Toxy butyl acetate may be used.

또한 글리콜 에테르계 용제로는 유니온 카바이드사의 메틸 셀로솔브, 에틸 셀로솔브, 에틸렌 글리콜 부틸 에테르, 디에틸렌 글리콜 메틸 에테르, 디에틸렌 글리콜 에틸에테르, 디에틸렌 글리콜부틸 에테르, 알코올계 용제로는 에탄올, 이소프로판올, n-부탄올, 아밀알콜, 사이클로 헥산올을 사용할 수 있다. In addition, as glycol ether solvents, Union Carbide's methyl cellosolve, ethyl cellosolve, ethylene glycol butyl ether, diethylene glycol methyl ether, diethylene glycol ethyl ether, diethylene glycol butyl ether, alcohol-based solvents include ethanol, isopropanol, n-butanol, amyl alcohol, or cyclohexanol may be used.

상기 용제는, 전체 도료 조성물에 대하여 30 ∼ 50 중량% 함유되는 것이 바람직하다. The solvent is preferably contained in an amount of 30 to 50% by weight with respect to the total coating composition.

<첨가제> <Additives>

본 발명에 따른 피씨엠 도료에는 Tacky성 개선 첨가제, 레벨링제, 소포제, 안료 등의 첨가제가 함유된다. The PCM paint according to the present invention contains additives such as tackiness improving additives, leveling agents, antifoaming agents, and pigments.

상기 Tacky성 개선 첨가제는 점착성을 개선하기 위한 것으로 전체 조성물을 기준으로 0.5 ~ 1.0중량%인 것이 바람직하다.The tacky property improving additive is for improving adhesion, and is preferably 0.5 to 1.0% by weight based on the total composition.

또한 도막의 평활성을 유지하고 도장 작업시 소포성 향상을 위하여, 아크릴계, 비닐계 또는 실리콘계 레벨링제와 소포제를 각각 0.5 ∼ 1.0중량% 첨가하는 것이 바람직하다.In addition, in order to maintain the smoothness of the coating film and to improve antifoaming properties during painting, it is preferable to add 0.5 to 1.0% by weight of an acrylic, vinyl or silicone leveling agent and an antifoaming agent, respectively.

상기한 레벨링제와 소포제로는, 쿠수모토 케미칼사의 디스파론 L-1980, 디스파론 L-1984, 디스파론 AP-30, BYK사의 BYK356, BYK410를 사용할 수 있다. As the leveling agent and antifoaming agent, Kusumoto Chemical's Disparon L-1980, Disparon L-1984, Disparon AP-30, and BYK's BYK356 and BYK410 can be used.

한편 본 발명의 도료 조성물은 안료를 함유하지 않는 투명 도료 조성물로는사용할 수 없으므로, 착색 안료를 첨가하여 사용한다.On the other hand, since the coating composition of the present invention cannot be used as a transparent coating composition containing no pigment, a colored pigment is added.

상기 착색 안료로는, 피복 조성물 분야에서 사용되는 카본블랙(Carbon Black) 중심의 티타늄 옥사이드(Titanium Oxide)를 사용하는 것이 바람직하다.As the color pigment, it is preferable to use titanium oxide centered on carbon black used in the field of coating compositions.

그 외에 활석, 점토, 실리카, 운모, 알루미나 등과 같은 체질 안료나 충진제 를 더 포함할 수 있다.In addition, it may further include extender pigments or fillers such as talc, clay, silica, mica, alumina, and the like.

상기 안료는, 전체 도료 조성물에 대하여 2 ∼ 5 중량% 함유되는 것이 바람직하다. The pigment is preferably contained in an amount of 2 to 5% by weight based on the total coating composition.

아래의 [표 4]는 도료를 선정하기 위한 시험용 도료의 조성을 나타낸 것이다.[Table 4] below shows the composition of the test paint for selecting the paint.

방열판 텍스쳐에 적용하기 위한 도료의 조성Composition of paint for application to heat sink texture 조성(중량%)Composition (wt%) 방열판 텍스쳐 적용 도료 Heat sink textured paint T-1T-1 T-2T-2 T-3T-3 T-4T-4 수지-AResin-A 1919 1919 18.518.5 16.516.5 수지-BResin-B 2626 25.525.5 2525 2424 분산 첨가제Dispersion Additives 1One 1One 1One 1One Carbon BlackCarbon Black 1010 1010 1010 1010 방열 Filler
(Graphite)heat dissipation filler
(Graphite) 0.50.5 1One 22 55 실리카silica 22 22 22 22 에폭시 수지epoxy resin 33 33 33 33 멜라민melamine 44 44 44 44 이소시아네이트isocyanate 1.21.2 1.21.2 1.21.2 1.21.2 레벨링제leveling agent 2.52.5 2.52.5 2.52.5 2.52.5 산촉매acid catalyst 0.80.8 0.80.8 0.80.8 0.80.8 Tin촉매Tin catalyst 1One 1One 1One 1One DBEDBE 1010 1010 1010 1010 PMAPMA 77 77 77 77 CYCLOHEXANONECYCLOHEXANONE 77 77 77 77 KOCOSOL 150KOCOSOL 150 55 55 55 55

그리고 1.0T의 AL강판을 메틸에틸케톤으로 탈지하고, [표 4]의 T-1 내지 T-4의 각 도료를 건조도막두께 12㎛가 되도록 바 코팅한 후, 300℃의 분위기 온도에서 50초간 소부하여 물성 시험 시편을 제조하였다.Then, the 1.0T AL steel sheet was degreased with methyl ethyl ketone, and each paint of T-1 to T-4 in [Table 4] was bar-coated to a dry film thickness of 12 μm, and then at an atmospheric temperature of 300° C. for 50 seconds. By baking, a physical property test specimen was prepared.

아래의 [표 5]는 상기 물성 시험 시편의 시험결과를 나타낸 것이다.[Table 5] below shows the test results of the physical property test specimen.

물성 시험 시편의 시험 결과Test results of physical property test specimens 조성(중량%)Composition (wt%) 물성 시험 시편의 시험결과Test results of physical property test specimens 실시예 1Example 1 실시예 2Example 2 실시예 3Example 3 실시예 4Example 4 비중importance 1.051.05 1.051.05 1.051.05 1.051.05 고형분solid content 37.037.0 37.037.0 37.037.0 37.037.0 점도(sec/25'C)Viscosity (sec/25'C) 100100 100100 100100 100100 광택Polish 4242 4242 4242 4242 경화도degree of hardening 5050 5050 5050 5050 연필경도pencil hardness FF FF FF FF 가공성machinability ◎◎ ◎◎ ◎◎ ◎◎ 부착성adherence ◎◎ ○○ △△ △△ 약품성drug ◎◎ △△ ○○ ○○ 내식성corrosion resistance ○○ ○○ ○○ △△ 방열성heat dissipation △△ ◎◎ ◎◎ ◎◎ 도료 저장성paint storability ◎◎ ◎◎ 점도 증가increase in viscosity 점도 증가increase in viscosity

위 [표 5]에서 ◎는 아주 양호, ○는 양호, △는 보통을 표시한 것이다.In [Table 5] above, ◎ indicates very good, ○ indicates good, and △ indicates average.

상기 물성 시험결과를 보면, 실시예 2의 경우가 도막 가공성, 방열성 및 도료 저장성에서 가장 우수함을 알 수 있다. Looking at the physical property test results, it can be seen that the case of Example 2 is the most excellent in coating film processability, heat dissipation property and paint storage property.

특히 본 발명에 따른 도료에 의하면, 가공성과 부착성을 유지하면서 방열성을 크게 향상시킬 수 있음을 확인할 수 있다. In particular, it can be confirmed that, according to the paint according to the present invention, heat dissipation can be greatly improved while maintaining workability and adhesion.

이에 따라 본 발명은, 높은 방열성능이 요구되는 세트 박스나 자동차 부품에 사용되는 방열판의 제조에 아주 유용하게 사용될 수 있다. Accordingly, the present invention can be very usefully used in manufacturing a heat sink used in a set box or automobile parts requiring high heat dissipation performance.

이상에서는 본 발명의 바람직한 실시예를 예시적으로 설명한 것으로서 본 발명의 범위는 상기한 특정 실시예에 한정되지 아니한다. 해당 기술분야에서 통상의 지식을 가진 자라면 본 발명의 기술적 사상의 범위를 벗어남이 없이 다양한 변경 및 수정이 가능하다는 것을 이해할 수 있을 것이다. In the above, preferred embodiments of the present invention have been exemplarily described, and the scope of the present invention is not limited to the specific embodiments described above. Those of ordinary skill in the art will understand that various changes and modifications are possible without departing from the scope of the technical spirit of the present invention.

10: 소지강판
20: 전처리층
30: 하도 도막층
40: 상도 도막층
50: 배면층10: Soji steel plate
20: pretreatment layer
30: undercoat layer
40: top coat layer
50: back layer

Claims (6)

주성분인 수지와, 가교제, 경화 촉매, 용제 및 첨가제를 포함하여 이루어지는 피씨엠(PCM: Pre-Coated Metal)용 도료 조성물에 있어서,
상기 수지는 폴리에스터 수지로서, 유연성을 향상시켜 가공성을 높이기 위한 A수지와, 소지강판과의 부착성을 향상시키기 위한 B수지로 이루어지고,
상기 A수지는,
중량평균분자량 15,000 ∼ 20,000, 수산가 20 ∼ 40mgKOH/g, 산가 1∼5 mgKOH/g, 유리전이온도 10 ∼ 20℃로서, 전체 조성물에 대하여 15 ∼ 30중량% 함유되고,
상기 B수지는,
방향족 성분이 40 ~ 60중량%이고, 중량평균 분자량 30,000 ∼ 35,000, 수산가 10 ∼ 30mgKOH/g, 산가 1∼3 mgKOH/g, 유리전이온도 25 ∼ 35℃로서, 전체 조성물에 대하여 15 ∼ 30중량% 함유되며,
방열성능을 향상시키기 위한 필러(Filler)로서, 6개의 탄소 원자 고리를 갖는 그래파이트(Graphite)가 전체 조성물에 대하여 1.0 ~ 2.0중량% 함유되고,
상기 A수지는,
도막의 가공성을 향상시키기 위해, 분자 구조 내에 프로판디올(Propanediol), 1,6-헥산디올(Hexanediol), 1,4-부탄디올(Butanediol) 중 어느 하나의 모노머가 A수지 내에 25 ~ 40중량% 함유되며,
상기 가교제는,
메톡시 멜라민 수지와 블록된(Blocked) 이소시아네이트 수지를 1 : 0.2 ~ 0.4의 비율로 혼합하여 사용하고,
상기 경화 촉매는,
p-톨루엔 술폰산(p-TSA), 디노닐나프탈렌 술폰산(DNNSA), 디나프탈렌 디술폰산(DNNDSA), 플루오로 술폰산 중에서 선택된 어느 하나의 술폰산을 2차 아민 또는 에폭시로 중화시켜 얻은 중화 생성물로서,
우레탄 가교 결합을 위해 Tin촉매(DBTDL)를 적용하고, 전체 조성물을 기준으로 0.5 ~ 2.0중량% 함유되며,
상기 첨가제는, 점착성 개선 첨가제, 레벨링제, 소포제 및 안료를 포함하고,
상기 점착성 개선 첨가제, 레벨링제 및 소포제는, 전체 조성물을 기준으로 각각 0.5 ~ 1.0중량% 함유되고,
상기 안료는, 카본블랙(Carbon Black) 중심의 티타늄 옥사이드(Titanium Oxide)로서 전체 조성물에 대하여 2 ~ 5중량% 함유되는 것을 특징으로 하는 피씨엠용 도료 조성물.In the coating composition for PCM (Pre-Coated Metal) comprising a resin as a main component, a crosslinking agent, a curing catalyst, a solvent and an additive,
The resin is a polyester resin, and consists of a resin A for improving flexibility to increase workability, and resin B for improving adhesion to a base steel sheet,
The A resin,
A weight average molecular weight of 15,000 to 20,000, a hydroxyl value of 20 to 40 mgKOH/g, an acid value of 1 to 5 mgKOH/g, a glass transition temperature of 10 to 20° C., and 15 to 30% by weight based on the total composition,
The B resin,
The aromatic component is 40 to 60% by weight, the weight average molecular weight is 30,000 to 35,000, the hydroxyl value is 10 to 30 mgKOH/g, the acid value is 1 to 3 mgKOH/g, and the glass transition temperature is 25 to 35°C, and 15 to 30% by weight based on the total composition. contains,
As a filler for improving heat dissipation performance, graphite having 6 carbon atom rings is contained in an amount of 1.0 to 2.0% by weight based on the total composition,
The A resin,
In order to improve the processability of the coating film, any one monomer among propanediol, 1,6-hexanediol, and 1,4-butanediol in the molecular structure is contained in resin A in an amount of 25 to 40% by weight. becomes,
The crosslinking agent,
Methoxy melamine resin and blocked (Blocked) isocyanate resin is used by mixing in a ratio of 1: 0.2 to 0.4,
The curing catalyst is
A neutralization product obtained by neutralizing any one sulfonic acid selected from p-toluene sulfonic acid (p-TSA), dinonylnaphthalene sulfonic acid (DNNSA), dinaphthalene disulfonic acid (DNNDSA), and fluorosulfonic acid with a secondary amine or epoxy,
Tin catalyst (DBTDL) is applied for urethane crosslinking, and contains 0.5 to 2.0% by weight based on the total composition,
The additive includes a tackiness improving additive, a leveling agent, an antifoaming agent, and a pigment,
The adhesive improving additive, the leveling agent and the antifoaming agent are each contained in an amount of 0.5 to 1.0% by weight based on the total composition,
The pigment is a carbon black (Carbon Black) centered titanium oxide (Titanium Oxide), PCM paint composition, characterized in that it contains 2 to 5% by weight based on the total composition. 삭제delete 삭제delete 삭제delete 삭제delete 삭제delete
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