KR100250827B1 - Composition of power paint for vehicle body - Google Patents

Composition of power paint for vehicle body Download PDF

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Publication number
KR100250827B1
KR100250827B1 KR1019970039504A KR19970039504A KR100250827B1 KR 100250827 B1 KR100250827 B1 KR 100250827B1 KR 1019970039504 A KR1019970039504 A KR 1019970039504A KR 19970039504 A KR19970039504 A KR 19970039504A KR 100250827 B1 KR100250827 B1 KR 100250827B1
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South Korea
Prior art keywords
epoxy resin
vehicle body
weight
polyester resin
powder coating
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KR1019970039504A
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Korean (ko)
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KR19990016818A (en
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손광호
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정몽규
현대자동차주식회사
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • 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
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
    • 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
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
    • C08K5/092—Polycarboxylic acids
    • 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
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/17—Amines; Quaternary ammonium 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
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/34—Heterocyclic compounds having nitrogen in the ring
    • C08K5/3442—Heterocyclic compounds having nitrogen in the ring having two nitrogen atoms in the ring
    • C08K5/3445—Five-membered rings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
    • 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
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03—Powdery paints
    • C09D5/033—Powdery paints characterised by the additives
    • 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
    • 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
    • C09D7/63—Additives non-macromolecular organic
    • 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
    • C09D7/65—Additives macromolecular
    • 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
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • 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
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Inorganic Chemistry (AREA)
  • Paints Or Removers (AREA)

Abstract

PURPOSE: A powdered paint composition for middle-path of car body is provided to improve durability, rigidity and chipping-resistance by adding bisphenol A epoxy resin, polycarboxylic acid, silica and other various pigments to a principle material, that is, acidic carboxyl terminated polyester. CONSTITUTION: A powdered paint composition for middle-path of car body comprises 20-40 wt.% of polyester resin as a principle material; 20-40 wt.% of epoxy resin as a hardener, 0.1 wt.% of imidazoles or amines as hardening catalysts; 5 wt.% of polycarboxylic acid as an additive and silica as a filler; and 20-40 wt.% of a mixture of titanium dioxide(TiO2) and calcium carbonate(CaCO3). The polyester resin as a principle material is acidic polyester resin to be treated with carboxyl groups at both ends thereof. Also, the epoxy resin as a hardener is bisphenol A type epoxy resin. The paint composition is applied to surface of a substrate by means of conventional painting methods.

Description

차체 중도용 분체도료 조성물Powder coating composition for vehicle body

본 발명은 고분자 수지를 기본 물질로 하고 여기에 적당한 조성의 첨가제를 혼합한 분말 형태의 차량용 분체도료에 관한 것으로, 더욱 상세하게는 카복실기로 말단화된 산성 폴리에스테르 수지에 비스페놀 A형 에폭시 수지, 폴리카복실산(polycarboxylic acid), 실리카(silica, SiO2) 및 각종 안료를 함유하는 분말 형태의 차량용 분체도료 조성물에 관한 것이다.The present invention relates to a powder coating for a vehicle in the form of a powder in which a polymer resin is used as a base material and an additive of a suitable composition is added thereto, and more particularly, a bisphenol-A epoxy resin and a poly The present invention relates to a powder coating composition for a vehicle in powder form containing polycarboxylic acid, silica (SiO 2 ) and various pigments.

휘발성이 있는 희석제 및 유기 용제에 전색제 및 안료를 녹여서 제조되는 액체 형태의 기존의 도료는, 도료를 도포하였을 때 도포된 고체표면에서 유기 용제가 휘발되어 도장막이 형성된다. 그러나, 휘발성이 있는 유기 용제 및 희석제를 사용함으로써 환경을 오염시키고, 용제의 휘발로 인하여 인체 중독이나 화재 발생의 위험성이 있으며, 도막 형성시 주름현상이나 흐름현상 등을 방지하기 위하여 도료의 점도를 조절해야 하고, 회수되지 않은 도료의 배수 및 처리시설이 필요하다는 점 등의 여러 가지 문제점이 대두되고 있다.In a conventional paint in liquid form prepared by dissolving a colorant and a pigment in a volatile diluent and an organic solvent, an organic solvent is volatilized on the applied solid surface when the paint is applied to form a coating film. However, by using volatile organic solvents and diluents, it pollutes the environment, there is a risk of poisoning or fire due to volatilization of solvents, and the viscosity of the paint is controlled to prevent wrinkles or flow during film formation. There are several problems, such as the need to do so and the drainage and treatment of unrecovered paint.

차량에 도색되는 기존의 도료는 희석제, 용제 및 도막성분으로 구성되는 액체형 도료가 널리 사용되어 왔다. 이중 희석제와 용제는 휘발성 유기화합물로서 도막 형성시 휘발되기 때문에 환경이 오염되고, 용제의 휘발로 인해 인체 중독이나 화재 발생의 위험성이 있으며, 도막 형성시의 주름현상이나 흐름현상 등을 방지하기 위하여 도료의 점도를 조절해야 하고, 회수되지 않은 도료를 처리할 별도의 장치와 노력이 요구되는 점 등의 전술한 액체형 도료가 일반적으로 가지고 있는 것과 같은 문제점이 발생된다. 뿐만 아니라 전색제 성분이 분자량이 큰 합성수지일 경우 용제에 대한 전색제의 용해도가 작아 사용가능한 전색제가 저분자량의 물질로 제한적이며 그로인해 형성되는 도장막의 물성이 취약하게 되어 새로운 차량용 도료가 요구되고 있다.Conventional paints painted on vehicles have been widely used as liquid paints composed of diluents, solvents and coating film components. Double diluents and solvents are volatile organic compounds that volatilize when forming a coating film, which pollutes the environment, and the volatilization of solvents may cause human poisoning or fire, and paints to prevent wrinkles or flow during coating. Problems such as those mentioned above generally occur with liquid paints, such as the need to adjust the viscosity of the paint and require a separate device and effort to treat the unrecovered paint. In addition, when the colorant component is a synthetic resin having a large molecular weight, the solubility of the colorant in the solvent is small and the available colorant is limited to a low molecular weight material, and thus the physical properties of the coating film formed are weakened, thereby requiring a new vehicle paint.

근래에 사용되는 분체도료는 피도장물에 분체도료를 분사한 후 가열하여 분체를 용해시켜 도장막을 형성한다. 이러한 분체 도료는 1) 다양한 합성수지를 사용할 수 있으며, 2) 위생적이며 환경 친화적이며 화재 위험성이 작으며, 3) 합성수지를 이용하기 때문에 도장막의 성능이 우수하며, 4) 분사후 도색되지 않은 도료의 회수가 용이하며, 5) 점도 조절 등의 작업이 불필요하고, 6) 청소나 폐수처리 등에 소요되는 간접경비를 절약할 수 있다는 등의 장점을 지니고 있다.Powder coatings used in recent years are sprayed with powder coating on the object to be coated and then heated to dissolve the powder to form a coating film. These powder paints can be used for 1) various synthetic resins, 2) hygienic, environmentally friendly, and low risk of fire, 3) excellent performance of coating due to the use of synthetic resins, and 4) recovery of unpainted paints after spraying. It is easy to use, 5) it is unnecessary to adjust the viscosity, and 6) it can save the indirect cost of cleaning and wastewater treatment.

이러한 분체도료에 사용될 수 있는 합성수지는 폴리염화비닐(PVC), 폴리아미드(polyamides), 에폭시수지(epoxy resin), 폴리에틸렌(polyethylene), 폴리프로필렌(polypropylene), 폴리에스테르(polyesters), 아크릴 수지(acrylic resin) 및 폴리에틸렌-비닐아세테이트 공중합체(EVA) 등이 있다.Synthetic resins that can be used for these powder coatings are polyvinyl chloride (PVC), polyamides, epoxy resins, polyethylene, polypropylene, polyesters, acrylic resins. resin) and polyethylene-vinylacetate copolymer (EVA).

한편, 분체도료를 피도장물에 도장하는 방법으로는 유동침지법, 정전도장법, 용사법 및 정전침지법이 있는데, 이 중 정전도장법이란 도료 분무장치에 음전하의 직류 고전압을 통하게 하여 도료 미립자를 대전시키고, 접지한 피도장물과 분무 장치사이의 정전기적인 힘을 이용하여 도장하는 방법이다.On the other hand, the coating method of the powder coating on the coating material is a flow immersion method, an electrostatic coating method, a spraying method and an electrostatic immersion method. Among these, the electrostatic coating method is used to charge the fine particles of the paint spraying apparatus through a direct current of a high voltage of negative charge. It is a method of painting using the electrostatic force between the grounded workpiece and the spraying device.

정전 도장법에 의해 만들어진 도장막은 1) 금속과의 접착성이 양호하며, 2) 내열성이 뛰어나고, 3) 연신율이 크고 활곡성이 뛰어나며, 4) 표면광택이 뛰어나며, 5) 표면경도가 높고, 스크래치(scratch)에 강하며, 6) 용융유동성이 좋아서 최종 표면의 평활성(smoothness)이 좋으며, 7) 도료의 손실이 10％ 이내이고 도장면의 기포가 없이 균일하다는 특징을 가지고 있다.The coating film made by electrostatic coating method is 1) good adhesion to metal, 2) excellent heat resistance, 3) high elongation and excellent flexibility, 4) excellent surface gloss, 5) high surface hardness, and scratch ( It is resistant to scratch, 6) It has good melt fluidity, so the smoothness of the final surface is good, and 7) the loss of paint is less than 10% and it is uniform without bubbles on the painted surface.

이에 본 발명자는 차량의 도색제로서 요구되는 물성들을 충족시키기 위하여 연구를 계속하여 오던 중, 기본 재료인 카복실기로 말단화된 폴리에스테르 수지에 비스페놀 A형 에폭시 수지를 경화제로 첨가하여 도막의 고분자가 망상구조를 갖게함으로써 내구성, 강성 및 내치핑성이 향상될 뿐만 아니라 환경 친화적인 분체도료를 개발하여 본 발명을 완성하였다.Accordingly, the present inventors have continued research to satisfy the properties required as a vehicle paint agent, and added a bisphenol A type epoxy resin as a curing agent to a polyester resin terminated with a carboxyl group, which is a basic material, so that the polymer of the coating film has a network structure. By having the durability, rigidity and chipping resistance is improved as well as developed an environmentally friendly powder coating to complete the present invention.

본 발명의 목적은 환경 친화적이며, 기존의 차량용 액체도료에 비해 제조공정이 단축되어 원가를 절감시킬 수 있으며, 액체도료에 비해 고분자량의 합성수지를 사용함으로써 도장막의 내구성, 강성 및 내치핑성 등이 향상될 수 있는 차체 중도용 분체도료를 제공하는 것이다.An object of the present invention is environmentally friendly, the manufacturing process is shortened compared to the existing vehicle liquid paints can reduce the cost, by using a synthetic resin of high molecular weight compared to liquid paints, such as durability, rigidity and chipping resistance of the coating film It is to provide a powder coating for the vehicle body can be improved.

상기 목적을 달성하기 위하여, 본 발명에서는 기본 물질인 카복시기로 말단화된 산성 폴리에스테르 수지에 경화제인 비스페놀 A형 에폭시 수지, 촉매제, 첨가제, 충진제 및 안료를 함유하는 차체 중도용 분체도료 조성물을 제공한다.In order to achieve the above object, the present invention provides a vehicle body powder coating composition containing a bisphenol A-type epoxy resin, a catalyst, an additive, a filler and a pigment as a curing agent in an acidic polyester resin terminated with a carboxyl group which is a basic material. .

이하, 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.

본 발명의 분체 도료 조성물은 기본 물질인 카복시기로 말단화된 산성 폴리에스테르 수지가 20∼40 중량％로, 경화제인 비스페놀 A형 에폭시 수지가 20∼40 중량％로, 경화 촉매인 이미다졸류 및 아민류가 0.1 ％로, 첨가제인 폴리카복실산 및 충진제인 실리카가 5 중량％로, 그리고 안료인 이산화티탄(TiO2) 및 탄산칼슘(CaCO3)이 20∼40 중량％로 구성된다.The powder coating composition of the present invention is 20 to 40% by weight of acidic polyester resin terminated by a carboxy group as a base material, and 20 to 40% by weight of bisphenol A type epoxy resin as a curing agent, and imidazoles and amines as curing catalysts. Is 0.1%, polycarboxylic acid as an additive and silica as a filler are 5% by weight, and titanium dioxide (TiO 2 ) and calcium carbonate (CaCO 3 ) as pigments are 20 to 40% by weight.

본 발명에는 수지 말단이 카복실기로 처리된 산성 폴리에스테르 수지가 사용되는데, 폴리에스테르 수지 말단의 카복실기가 에폭시 수지의 히드록시기와 축합반응을 일으켜 망상구조를 형성함으로써 도장막이 경화된다. 본 발명에서는 비스페놀 A형 에폭시 수지가 경화제로 첨가되어 에폭시 수지와 카복실기로 말단 처리된 폴리에스테르 수지가 가교 반응(graft polymerization)을 일으켜 망상구조를 형성하여 도막의 내구성 등의 물성이 향상된다.In the present invention, an acidic polyester resin in which the resin terminal is treated with a carboxyl group is used. The coating film is cured by forming a network structure by causing the carboxyl group at the polyester resin terminal to condense the hydroxyl group of the epoxy resin. In the present invention, a bisphenol A type epoxy resin is added as a curing agent, and a polyester resin terminated with an epoxy resin and a carboxyl group causes a crosslinking reaction to form a network structure, thereby improving physical properties such as durability of the coating film.

이러한 경화에 사용되는 촉매로는 이미다졸류 또는 제 3급 아민류(tertiary amines)가 있으며 촉매는 0.1∼4 중량％ 정도로 첨가되는 것이 바람직하다. 만일 촉매의 함량이 10 중량％를 초과하면 도료로서 도막성능이 저하되며 저장 안정성에도 문제가 발생된다. 또한, 사용되는 경화 촉매의 종류에 따라서 가교도(degree of graft polymerization)의 차이가 나타나 도막의 기계적 및 화학적 특성이 향상 또는 저하될 수 있다.Catalysts used for such curing include imidazoles or tertiary amines, and the catalyst is preferably added at about 0.1 to 4% by weight. If the content of the catalyst exceeds 10% by weight, the coating performance as a coating is lowered, and there is a problem in storage stability. In addition, a difference in degree of graft polymerization may appear depending on the type of curing catalyst used, thereby improving or decreasing the mechanical and chemical properties of the coating film.

본 발명에 사용되는 충진제로는 실리카가 포함된다. 충진제가 기설정된 특정 범위 이상 함유되었을 때는 내충격성 및 부착성이 현저히 저하되며, 특정 범위 이하의 함량으로 첨가되었을 때는 내충격성 및 부착성은 우수하지만 유리전이온도(glass transition temperature, Tg)가 낮아지게 된다. 사용되는 충진제의 종류에 따라서 고분자 주쇄의 공간상에 배열하는 형태가 달라져 도막의 기계적 및 화학적 특성이 향상 또는 저하될 수 있다.Fillers used in the present invention include silica. When the filler is contained in a predetermined range or more, the impact resistance and adhesion are significantly lowered. When the filler is added in a content below the predetermined range, the impact resistance and adhesion are excellent, but the glass transition temperature (T g ) is lowered. do. Depending on the type of filler used, the arrangement of the polymer main chain on the space may vary, thereby improving or decreasing the mechanical and chemical properties of the coating film.

또한 본 발명의 분체도료 조성물에는 첨가제로서 폴리카복실산을 함유할 수 있다.In addition, the powder coating composition of the present invention may contain a polycarboxylic acid as an additive.

그리고, 본 발명의 분체도료 조성물에는 안료로서 이산화티탄과 탄산칼슘이 첨가된다. 그러나, 이러한 첨가제 및 안료는 분체도료 전체의 기계적 및 화학적 물성을 좌우하지는 않는다.In addition, titanium dioxide and calcium carbonate are added to the powder coating composition of the present invention as a pigment. However, these additives and pigments do not influence the mechanical and chemical properties of the whole powder coating.

본 발명의 분체도료 조성물의 제조방법은 특정한 방법에 국한되지는 않으며, 일반적으로 80∼120℃ 의 용융혼련기를 사용하여 용융혼련, 냉각 및 분쇄를 통하여 제조될 수 있다.The production method of the powder coating composition of the present invention is not limited to a specific method, and in general, it may be prepared by melt kneading, cooling, and grinding using a melt kneader at 80 to 120 ° C.

이렇게 제조된 분체도료는 보통 45℃ 이상의 융점을 지니며 상온에서는 고체상의 분말로 존재한다.The powder coating thus prepared usually has a melting point of 45 ° C. or higher and exists as a solid powder at room temperature.

상기의 성분들로 구성된 열경화성 분체도료 조성물에 의해 내구성, 강성 및 내치핑성이 우수한 도막이 얻어져 본 발명의 조성물을 차체 중도 도장에 적용할 때 우수한 성능을 발휘할 수 있다.By the thermosetting powder coating composition composed of the above components, a coating film excellent in durability, rigidity and chipping resistance can be obtained, and can exhibit excellent performance when the composition of the present invention is applied to a vehicle body coating.

본 발명의 분체도료 조성물은 유동침적법, 정전 도장법, 용사법 및 정전 침적법을 이용하여 피도장막에 도색처리할 수 있다.The powder coating composition of the present invention can be coated on the coating film by using a fluid deposition method, an electrostatic coating method, a spraying method, and an electrostatic deposition method.

이상에서 살펴본 바와 같이, 본 발명의 분체도료 조성물은 기존의 액상 도료에서의 문제점인 도막형성시 휘발성분의 유기용제로 인해 야기되는 환경오염, 인체중독 및 화재 발생의 위험성이 없으며, 용제를 사용하지 않으므로 전색제에 제한이 없어 고분자량의 열경화성 수지를 이용한 치밀한 구조의 도막형성이 가능하고 그로인해 우수한 기계적 및 화학적 특성을 갖는 도막을 형성시킬 수 있는 분체도료 조성물이다. 또한, 본 발명의 분체도료 조성물이 유동 침적법, 정전 도장법, 용사법 및 정전 침적법 등의 방법으로 도색되면 금속과의 접착성이 양호하며, 내열성, 연신율, 표면광택, 표면경도 및 내스크래치성이 우수한 도막이 형성되고 도포된 분체도료의 용융 유동성이 좋아 최종적으로 형성되는 도막의 평활성이 좋으며, 도료손실을 절감시킬 수 있다. 따라서, 본 발명의 분체도료 조성물은 차체 중도용 도료로 유용하게 이용될 수 있다.As described above, the powder coating composition of the present invention has no risk of environmental pollution, human poisoning and fire caused by organic solvents of volatile components when forming a coating film, which is a problem in conventional liquid paints, and does not use a solvent. Therefore, it is possible to form a dense coating film using a high molecular weight thermosetting resin because there is no restriction in the colorant, and thus a powder coating composition capable of forming a coating film having excellent mechanical and chemical properties. In addition, when the powder coating composition of the present invention is painted by a method such as flow deposition method, electrostatic coating method, spraying method and electrostatic deposition method, the adhesion with metal is good, and heat resistance, elongation, surface gloss, surface hardness and scratch resistance The excellent coating film is formed and the melt fluidity of the applied powder coating is good, the smoothness of the final coating film is good, it is possible to reduce the paint loss. Therefore, the powder coating composition of the present invention can be usefully used as a vehicle coating material.

Claims (4)

기본 물질인 폴리에스테르 수지가 20∼40 중량％, 경화제인 에폭시 수지가 20∼40 중량％, 경화촉매인 이미다졸류 또는 아민류가 0.1 중량％, 첨가제인 폴리카복실산 및 충진제인 실리카가 5 중량％, 이산화티탄(TiO2) 및 탄산칼슘(CaCO3)이 20∼40 중량％로 구성되는 것을 특징으로 하는 차체 중도용 분체도료 조성물.20 to 40% by weight of polyester resin as the base material, 20 to 40% by weight of epoxy resin as curing agent, 0.1% by weight of imidazole or amines as curing catalyst, 5% by weight of polycarboxylic acid as additive and silica as filler Titanium dioxide (TiO 2 ) and calcium carbonate (CaCO 3 ) is composed of 20 to 40% by weight of the vehicle body powder coating composition. 제 1항에 있어서, 기본물질인 폴리에스테르 수지는 양 말단이 카복실기로 처리된 산성 폴리에스테르 수지를 사용하는 것을 특징으로 하는 차체 중도용 분체도료 조성물.The powder coating composition for vehicle body intermediate according to claim 1, wherein the polyester resin as a base material uses an acidic polyester resin whose both ends are treated with a carboxyl group. 제 1항에 있어서, 경화제인 에폭시 수지는 비스페놀 A형 에폭시 수지인 것을 특징으로 하는 차체 중도용 분체도료 조성물.The powder coating composition for vehicle body intermediate according to claim 1, wherein the epoxy resin which is a curing agent is a bisphenol A epoxy resin. 제 1항에 있어서, 피도장막에 유동침적법, 정전 도장법, 용사법 및 정전 침적법을 이용하여 도색처리하는 것을 특징으로 하는 차체 중도용 분체도료 조성물.The powder coating composition for a vehicle body intermediate coating method according to claim 1, wherein the coating film is subjected to a coating process using a fluid deposition method, an electrostatic coating method, a spraying method, and an electrostatic deposition method.
KR1019970039504A 1997-08-20 1997-08-20 Composition of power paint for vehicle body KR100250827B1 (en)

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