KR100408110B1 - Emulsion Polymerization Composition for Electrical Steel - Google Patents

Emulsion Polymerization Composition for Electrical Steel Download PDF

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KR100408110B1
KR100408110B1 KR10-1998-0060099A KR19980060099A KR100408110B1 KR 100408110 B1 KR100408110 B1 KR 100408110B1 KR 19980060099 A KR19980060099 A KR 19980060099A KR 100408110 B1 KR100408110 B1 KR 100408110B1
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weight
parts
organic
coating
emulsion polymerization
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KR20000043694A (en
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오택수
이석주
이동열
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주식회사 포스코
재단법인 포항산업과학연구원
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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
    • C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
    • 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
    • C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
    • C09D125/02—Homopolymers or copolymers of hydrocarbons
    • C09D125/04—Homopolymers or copolymers of styrene
    • C09D125/08—Copolymers of styrene
    • C09D125/14—Copolymers of styrene with unsaturated esters
    • 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
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09D133/10—Homopolymers or copolymers of methacrylic acid esters
    • C09D133/12—Homopolymers or copolymers of methyl methacrylate
    • 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
    • C09D5/08—Anti-corrosive paints
    • 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

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
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  • Paints Or Removers (AREA)

Abstract

철재 표면에 크로메이트와 유기 수기 코팅을 통해 절연성과 내식성 등의 물성을 부여 전동기, 발전기, 소형 변압기 등에 사용되는 전기 강판용 유무기 복합 코팅제 중 유화 중합에 의한 수지의 조성에 관한 것으로, 전기 강판용 유무기 복합 코팅제에 있어서, 도막에 강인성과 경도를 높이며 가격이 비교적 저렴한 메틸메타아크릴레이트와 스티렌에, 부틸아크릴레이트와, 디비닐 벤젠을 첨가하고, 반응 개시 촉매는 KPS를 이용하며, 유화제는 크로메이트 용액과 친화성을 주기 위해서 비이온계 유화제를 사용하고 2차 이온수에 분산을 해서 유화 중합체를 얻는 것을 특징으로 하는 수지 조성물로써, 도막 형성능이 뛰어나며 내식성도 높아 경제적으로 저렴하고 전기 강판용 유기 코팅제로 사용이 가능해서 공업적으로 매우 유용하다.Provides physical properties such as insulation and corrosion resistance through chromate and organic hand coating on steel surface. It is related to the composition of resin by emulsion polymerization in organic-inorganic composite coating agent for electric steel sheets, generators, small transformers, etc. In the coating agent, butyl acrylate and divinyl benzene are added to methyl methacrylate and styrene, which are relatively inexpensive and have high toughness and hardness, and the reaction initiation catalyst is KPS. It is a resin composition which uses a nonionic emulsifier to disperse in secondary ionized water to give chemical conversion, and obtains an emulsion polymer. It has excellent coating ability and high corrosion resistance, which is economically inexpensive and can be used as an organic coating agent for electrical steel sheet. It is very useful industrially.

Description

전기 강판용 유화 중합 수지 조성물Emulsion Polymerization Resin Composition for Electrical Steel Sheet

본 발명은 전기 강판용 유화 중합 수지 조성물에 관한 것으로, 보다 상세하게는 철재 표면에 크로메이트(chromate)와 유기 수기 코팅을 통해 절연성과 내식성등의 물성을 부여 전동기, 발전기, 소형 변압기 등에 사용되는 전기 강판용 유무기 복합 코팅제 중 유화 중합에 의한 수지의 조성에 관한 것이다.The present invention relates to an emulsion polymerization resin composition for electric steel sheet, and more particularly, to provide electrical properties such as insulation and corrosion resistance through chromate and organic hand coating on the surface of steel, for use on electric steel sheets, generators, small transformers, etc. It relates to the composition of the resin by emulsion polymerization in the composite coating agent.

무방향성 전기강판(non-oriented silicon steel sheet)이란 강재 내에 결정 배열이 불규칙적이어서 특정 방위에 편중되지 않은 자기적 특성을 나타내는 것으로 전동기, 발전기, 소형 변압기 등에 사용되는 소재를 말한다. 철재가 전기 강판으로써 쓰이기 위해서는 표면에 내식성, 내후성, 절연성 등의 물리 화학적 특성이 필요한 데, 소재 강판으로써는 이런 특성들을 모두 만족하기 어렵다.Non-oriented silicon steel sheet (non-oriented silicon steel sheet) is a material used in electric motors, generators, small transformers, etc., which exhibits magnetic properties that are not biased in a specific direction due to irregular crystal arrangement in steel. In order for steel to be used as an electric steel sheet, physicochemical properties such as corrosion resistance, weather resistance, and insulation are required on the surface, and it is difficult to satisfy all of these properties as a material steel sheet.

따라서, 소재의 표면 처리를 통해서 이런 특성들을 강화하게 되는 데, 이 표면 처리용 코팅액으로 주로 무기계 코팅, 유기계 코팅 및 유무기 복합형을 사용하고 있다. 이 중에서, 무기계 코팅과 유기계 코팅계의 코팅은 유무기 복합형에 비해서 두꺼운 코팅층을 형성하여야 상기 목적하는 물성을 만족할 수 있는 단점이 있다. 이에 비해 유무기 복합형은 부동층을 부여하는 무기재와 결합제 역할을 하면서도막 물성에 영향을 미치는 유기재로 이루어져 전기 강판의 절연성과 내식성 등의 물성을 높여 준다. 무기재로는 주로 크로메이트 용액으로 이루어지고, 유기재는 각각의 요구 물성에 따라 아크릴계 유화 중합 수지와 첨가제로 이루어진다.Therefore, these characteristics are strengthened through the surface treatment of the material, and the inorganic coating, the organic coating, and the organic / inorganic composite type are mainly used as the coating liquid for the surface treatment. Among them, the inorganic coating and the organic coating may have a disadvantage in that a thick coating layer may be formed as compared with the organic-inorganic composite to satisfy the desired physical properties. In comparison, the organic-inorganic composite type is composed of an inorganic material that provides a passivation layer and an organic material that acts as a binder and affects film properties, thereby improving physical properties such as insulation and corrosion resistance of electrical steel sheets. The inorganic material mainly consists of chromate solution, and the organic material consists of acrylic emulsion polymerization resin and additives according to the required physical properties.

상기 유화 중합 수지는 분산매(이온수) 속에 유화제를 이용해서 유기 단량체와 촉매를 첨가 가열하여 유화된 상태의 고분자 용액을 얻는 것으로 많은 유용한 사용처를 가지고 있으며, 특히 금속 등의 외부 표면 처리에 많이 이용된다.The emulsion polymerized resin has many useful uses, by adding and heating an organic monomer and a catalyst using an emulsifier in a dispersion medium (ionized water) to obtain a polymer solution in an emulsified state, and is particularly used for external surface treatment of metals and the like.

전기 강판용으로 사용되는 유화 중합체는 여러 가지 요구 사항을 충족시켜야 하는 데, 첫째 소재와의 밀착성이 높아야 하고, 둘째 외관 즉, 색상과 조도를 만족시켜야 하며, 셋째 도막의 안정성 즉, 내마모성, 내후성, 내식성 등이 요구되며, 강산인 크로메이트 용액과 상용성이 좋아야 한다.Emulsified polymers used for electrical steel sheet must meet various requirements: first, high adhesion to the material, second appearance, color and roughness, third, stability of the coating, that is, wear resistance, weather resistance, corrosion resistance And the like, and must be compatible with the chromate solution, which is a strong acid.

기존의 유무기 복합형 코팅 수지는 주로 메틸메타아크릴레이트(MMA : methylmethacrylate)와 부틸아크릴레이트(BA : n-butylacrylate) 등으로 이루어져 있는 데, 이것만으로는 소재에 대한 은폐성이 떨어져 적절한 청녹색의 색상을 얻기가 힘들고, 자기 평활력이 떨어져 소재의 조도를 평탄하게 낮추기가 힘들며, 내후성, 내용매성 및 내식성 등이 상대적으로 떨어지는 단점이 있다.Conventional organic-inorganic composite coating resins mainly consist of methyl methacrylate (MMA: methylmethacrylate) and butyl acrylate (BA: n-butylacrylate). It is difficult to obtain, it is difficult to lower the roughness of the material flat because of the low self-smoothing power, there is a disadvantage that the weather resistance, solvent resistance and corrosion resistance is relatively low.

일본 특허 소 58-224175호에는 소재 강판에 크로메이트 처리를 한 후 수지를 그 위에 코팅하는 방법이 제안되어 있다. 이 방식에 의하면 물성은 상대적으로 좋으나, 전처리 후에 수세를 하고 가공 공정을 거친 후 코팅을 해야 하므로, 공정이 복잡하고 유화 수지가 전기 강판용으로 사용하기엔 내후성과 내용제성이 떨어지며 크로메이트와 수지의 표면 처리 공정이 다르게 이루어지므로 수지와 크로메이트 용액의 상용성이 없어서 동시에 코팅이 어렵다.Japanese Patent No. 58-224175 proposes a method of coating a resin on a raw material steel plate after chromate treatment. According to this method, the physical properties are relatively good, but the water treatment after the pretreatment and coating after the processing process is complicated, and the process is complicated and the weathering resistance and solvent resistance are insufficient for the emulsified resin to be used for electrical steel sheet. Since it is made differently, there is no compatibility between the resin and the chromate solution, so coating is difficult.

일본 특허 소 63-145785호에는 크로메이트 용액과 유화 수지를 혼합해서 철재 소재 표면에 크로메이트 수지층을 형성시키는 방법이 제안되어 있다. 이 방식에 의하면 본 발명에서 요구되는 전기 강판용 수지와 유사하나 코팅층의 소재에 대한 은폐성, 자기 평활성 및 내후성 등이 떨어지는 단점이 있다.Japanese Patent No. 63-145785 proposes a method of mixing a chromate solution and an emulsion resin to form a chromate resin layer on the surface of an iron material. This method is similar to the resin for electrical steel sheets required by the present invention, but has a disadvantage in that the concealability, self-smoothness and weather resistance to the material of the coating layer are poor.

본 발명은 이와 같은 문제점을 해결하기 위하여 안출한 것으로, 그 목적은 전기 강판용 유무기 복합 코팅제에 있어서, 소재의 보호, 방식, 방청 그리고 표면의 색상, 평활성(spreading), 내약품성, 내후성 및 절연성 등이 우수한 전기 강판용 유화 중합 수지 조성물을 제공하는 것이다.The present invention has been made to solve such a problem, the purpose of the organic-inorganic-inorganic composite coating for electrical steel sheet, the protection of the material, anticorrosion, rust preventive and surface color, spreading, chemical resistance, weather resistance and insulation, etc. It is to provide this excellent emulsion polymerization resin composition for electrical steel sheet.

상기와 같은 목적을 달성하기 위하여, 본 발명은 전기 강판용 유무기 복합 코팅제에 있어서, 도막에 강인성과 경도를 높이며 가격이 비교적 저렴한 메틸메타아크릴레이트(MMA : methylmethacrylate)와 스티렌(St : styrene)에, 부틸아크릴레이트(BA : n-butylacrylate)와, 디비닐 벤젠(DVB : divinyl benzene)을 첨가하고, 반응 개시 촉매는 KPS(potassium peroxodisulfate)를 이용하며, 유화제는 크로메이트 용액과 친화성을 주기 위해서 비이온계 유화제를 사용하고 2차 이온수에 분산을 해서 유화 중합체를 얻는 것을 특징으로 하는 수지 조성물이다.In order to achieve the above object, the present invention, in the organic-inorganic composite coating agent for electrical steel sheet, to increase the toughness and hardness in the coating film and to the relatively low price methyl methacrylate (MMA: methylmethacrylate) and styrene (St: styrene), Butyl acrylate (BA: n-butylacrylate) and divinyl benzene (DVB) are added, and the reaction initiation catalyst uses KPS (potassium peroxodisulfate), and the emulsifier is non-ionic to give affinity with chromate solution. It is a resin composition characterized by dispersing in secondary ionized water using a system emulsifier to obtain an emulsion polymer.

상기 메틸메타아크릴레이트의 함량은 30 ~ 70 중량부로 하는 것이 바람직하고, 상기 스티렌의 함량은 20 ~ 50 중량부로 하는 것이 바람직하다.The content of the methyl methacrylate is preferably 30 to 70 parts by weight, and the content of the styrene is preferably 20 to 50 parts by weight.

그리고, 상기 부틸아크릴레이트는 주쇄에 공중합 되어 유리 전이 온도(glass transition temperature ; 이하 Tg라고 함)를 낮추어 도막 형성능과 평활성을 높여 주는 역할을 하며 함량은 10 ~ 20 중량부로 하는 것이 바람직하다.In addition, the butyl acrylate is copolymerized to the main chain to lower the glass transition temperature (hereinafter referred to as Tg) to increase the film forming ability and smoothness, the content is preferably 10 to 20 parts by weight.

또한, 상기 디비닐 벤젠은 2개의 반응성 관능기를 가지고 가교제 역할을 하여 내후성, 내식성 및 절연성 등의 물성을 강화시키며, 함량은 10 중량부 내외로 하는 것이 바람직하다.In addition, the divinyl benzene has two reactive functional groups to act as a crosslinking agent to enhance physical properties such as weather resistance, corrosion resistance and insulation, the content is preferably about 10 parts by weight.

한편, 상기 유화 중합체에 가교제 역할을 하는 알콕시 알킬 아크릴아마이드(alkoxy alkyl acrylamide)를 첨가하여 내후성과 내식성을 향상시키며, 함량은 1 ~ 10 중량부, 특히 2 ~ 3 중량부로 하는 것이 바람직하다.Meanwhile, alkoxy alkyl acrylamide, which acts as a crosslinking agent, is added to the emulsion polymer to improve weather resistance and corrosion resistance, and the content is preferably 1 to 10 parts by weight, in particular 2 to 3 parts by weight.

상기 알콕시 알킬 아크릴아마이드는 아래와 같은 기구를 거쳐 가교를 일으키고 이렇게 생긴 고분자 간의 가교를 도막의 치밀성을 높여 내후성과 내식성의 향상을 가져오게 된다.The alkoxy alkyl acrylamide causes crosslinking through the following mechanisms, thereby increasing the compactness of the coating film resulting in improved weatherability and corrosion resistance.

이하, 실험 데이터를 참조로 하여 본 발명에 따른 바람직한 실시예를 설명한다.Hereinafter, preferred embodiments of the present invention will be described with reference to experimental data.

실시예 1Example 1

하기 표 1에 전기 강판용 유화 중합 수지를 나타내었다. 메틸메타아크릴레이트, 스티렌, 부틸아크릴레이트, 디비닐 벤젠 각각의 조성물을 혼합하고 이온수에 유화제를 이용해서 교반하면서 유화시킨 후 반응기에 일정하게 3 시간 동안 적가하고 3 시간의 추가 반응 후 유합 중합체를 얻었다.Table 1 shows an emulsion polymerization resin for electrical steel sheets. Each composition of methyl methacrylate, styrene, butyl acrylate, and divinyl benzene was mixed, emulsified with stirring with an emulsifier in ionized water, and then added dropwise to the reactor for 3 hours, and after 3 hours of further reaction, a coalescent polymer was obtained. .

하기 표 1에서 단량체를 100 중량부로, 개시제는 0.1 중량부로, 유화제는 5 중량부로, 이온수는 130 중량부로 하였다.In Table 1, 100 parts by weight of the monomer, 0.1 part by weight of the initiator, 5 parts by weight of the emulsifier, and 130 parts by weight of ionized water.

[표 1]TABLE 1

상기 표 1의 조성에 의해 유화 중합을 실시한 후 Tg를 측정하였다. Tg가 높으면 도막이 부서지기 쉬워서 도막 형성에 문제가 발생하고 너무 낮으면 도막의 경도가 떨어져 내후성이 약한 도막이 되기 쉽다. Tg 50 ~ 100℃를 기준으로 이보다 낮거나 높은 중합물은 전기 강판용으로 사용하기 힘들다. 하기 표 2에 각 조성별로 Tg를 나타내었다.Tg was measured after emulsion polymerization by the composition of Table 1 above. If the Tg is high, the coating film tends to be brittle, causing problems in forming the coating film. If the Tg is too low, the coating film is poor in hardness, and the weatherability tends to be weak. Lower or higher polymers based on Tg 50-100 ° C are difficult to use for electrical steel sheets. Table 2 shows the Tg for each composition.

[표 2]TABLE 2

상기 표 2에 도시된 바와 같이, 메틸메타아크릴레이트를 30 ~ 70 중량부, 스티렌을 20 ~ 50 중량부, 디비닐 벤젠을 약 10 중량부 내외, 부틸아크릴레이트를 10 ~ 20 중량부에서 Tg가 60 ~ 80℃의 중합체를 얻을 수 있고 이 범위 밖에서는 중합수지가 너무 부서지기 쉽거나 약해서 도막 성능이 저하되었다.As shown in Table 2, 30 to 70 parts by weight of methyl methacrylate, 20 to 50 parts by weight of styrene, about 10 parts by weight of divinyl benzene and 10 to 20 parts by weight of butyl acrylate. The polymer of 60-80 degreeC can be obtained, and out of this range, the polymeric resin was too brittle or weak, and the coating film performance fell.

상기 표 1의 조성에 의한 유화 중합체 중 도막 형성능이 양호한 시편 번호 3, 5, 6, 9, 11, 12를 0.7mm의 냉연 강판에 도포한 후 200℃의 오븐에서 30초 동안 경화한 후 염수분무 시험을 24 시간 동안 실시하면서 4 시간마다 방청능을 시험하여 하기 표 3에 나타내었다.Sample number 3, 5, 6, 9, 11, and 12 having good coating film forming ability among the emulsion polymers according to the composition of Table 1 were applied to a cold rolled steel sheet of 0.7 mm, and then cured in an oven at 200 ° C. for 30 seconds. The test was carried out for 24 hours to test the rust resistance every 4 hours is shown in Table 3 below.

[표 3]TABLE 3

○: 방청능이 양호, △: 약간의 발청이 보임, ×: 심한 발청으로 도막 파괴(Circle): Antirust property is good, (triangle | delta): Slight rusting is seen, x: The coating film is destroyed by severe rusting.

이상에서 본 바와 같이, 메틸메타아크릴레이트를 30 ~ 70 중량부, 스티렌을 20 ~ 50 중량부, 디비닐 벤젠을 약 10 중량부 내외, 부틸아크릴레이트를 10 ~ 20 중량부에서 Tg가 적당하고 도막 형성능이 뛰어나며 내식성도 높음을 알 수 있다.As seen above, Tg is suitable at 30 to 70 parts by weight of methyl methacrylate, 20 to 50 parts by weight of styrene, about 10 parts by weight of divinyl benzene, and 10 to 20 parts by weight of butyl acrylate. It is excellent in forming ability and high corrosion resistance.

실시예 2Example 2

하기 표 4에 실시예 1의 조성에 알콕시 알킬 아크릴아마이드로 히드록시메틸아크릴아마이드(HMA : N-hydroxymethylacrylamide)를 첨가한 조성을 나타내었다. 각각의 조성물을 실시예 1과 같은 방법으로 유화시킨 후 반응기에 일정하게 5 시간동안 적가하고 2시간의 추가 반응 후 유화 중합체를 얻었다.Table 4 shows the composition of hydroxymethylacrylamide (HMA: N-hydroxymethylacrylamide) as the alkoxy alkyl acrylamide in the composition of Example 1. Each composition was emulsified in the same manner as in Example 1, and then dropwise added to the reactor for 5 hours and an emulsion polymer was obtained after 2 hours of further reaction.

[표 4]TABLE 4

○: 양호, △: 크랙 발생, ×: 불량(Circle): good, (triangle | delta): a crack generation, x: bad

상기 표 4의 조성에 의해 유화 중합을 실시한 후 도막 형성능을 측정하였다. 가교도가 높아서 도막이 부서지기 쉬우며 도막 형성에 문제가 발생하고 너무 낮으면 도막의 내식성 및 경도가 떨어지기 쉽다.After the emulsion polymerization was carried out by the composition of Table 4, the coating film forming ability was measured. The high degree of crosslinking makes the coating film brittle, and problems in forming the coating film occur. If the coating film is too low, the corrosion resistance and hardness of the coating film tend to fall.

메틸메타아크릴레이트를 30 ~ 70 중량부, 스티렌을 20 ~ 50 중량부, 디비닐벤젠을 약 10 중량부 내외, 부틸아크릴레이트를 10 ~ 20 중량부, 히드록시메틸아크릴아마이드를 2 ~ 5 중량부에서 도막 형성능이 양호하고 경도가 높고 중합체를 얻을 수 있고, 이 범위 밖에서는 중합 수지가 너무 부서지기 쉽거나 약해서 도막 성능이 저하되었다.30 to 70 parts by weight of methyl methacrylate, 20 to 50 parts by weight of styrene, about 10 parts by weight of divinylbenzene, 10 to 20 parts by weight of butyl acrylate and 2 to 5 parts by weight of hydroxymethylacrylamide The coating film formation ability was good, the hardness was high, and a polymer was obtained. Outside this range, the polymeric resin was too brittle or weak, and the coating film performance fell.

상기 표 4의 조성에 의한 유화 중합체를 0.7mm의 냉연 강판에 도포한 후 200℃의 오븐에서 30초 동안 경화한 후 염수분무 시험을 24 시간 동안 실시하면서 8시간마다 방청능을 시험하여 하기 표 5에 나타내었다.The emulsion polymer according to the composition of Table 4 was applied to a cold rolled steel sheet of 0.7mm and then cured in an oven at 200 ° C. for 30 seconds, followed by a salt spray test for 24 hours to test the rust resistance every 8 hours. Shown in

[표 5]TABLE 5

○: 방청능이 양호, △: 약간의 발청이 보임, ×: 심한 발청으로 도막 파괴(Circle): Antirust property is good, (triangle | delta): Slight rusting is seen, x: The coating film is destroyed by severe rusting.

이상에서 본 바와 같이, 메틸메타아크릴레이트를 30 ~ 70 중량부, 스티렌을 20 ~ 50 중량부, 디비닐 벤젠을 약 10 중량부 내외, 부틸아크릴레이트를 10 ~ 20 중량부, 히드록시메틸아크릴아마이드를 2 ~ 5 중량부에서 도막 형성능이 뛰어나며 내식성도 높음을 알 수 있다.As seen above, about 30 to 70 parts by weight of methyl methacrylate, about 20 to about 50 parts by weight of styrene, about 10 parts by weight of divinyl benzene, and about 10 to 20 parts by weight of butyl acrylate, and hydroxymethyl acrylamide 2 to 5 parts by weight of the excellent film-forming ability, it can be seen that the corrosion resistance is also high.

이와 같이 본 발명은 도막 형성능이 뛰어나며 내식성도 높아 경제적으로 저렴하고 전기 강판용 유기 코팅제로 사용이 가능해서 공업적으로 매우 유용하다.As described above, the present invention has excellent coating film forming ability and high corrosion resistance, so it is economically inexpensive and can be used as an organic coating agent for electrical steel sheet, which is very useful industrially.

Claims (2)

전기 강판용 유무기 복합 코팅제에 있어서,In the organic-inorganic composite coating agent for electrical steel sheet, 도막에 강인성과 경도를 높이는 메틸메타아크릴레이트 30 ~ 70 중량부와 스티렌 20 ~ 50 중량부에, 부틸아크릴레이트 10 ~ 20 중량부와, 디비닐 벤젠 10 ~ 20 중량부를 첨가하는 것을 특징으로 하는 전기 강판용 유화 중합 수지 조성물.10 to 20 parts by weight of butyl acrylate and 10 to 20 parts by weight of divinyl benzene are added to 30 to 70 parts by weight of methyl methacrylate and 20 to 50 parts by weight of styrene to increase the toughness and hardness to the coating film. Emulsion polymerization resin composition for steel sheets. 제 1 항에 있어서, 상기 조성물이 1 ~ 10 중량부의 알콕시 알킬 아크릴아마이드를 추가로 포함하는 것을 특징으로 하는 전기 강판용 유화 중합 수지 조성물.The emulsion polymerization resin composition for electrical steel sheet according to claim 1, wherein the composition further comprises 1 to 10 parts by weight of alkoxy alkyl acrylamide.
KR10-1998-0060099A 1998-12-29 1998-12-29 Emulsion Polymerization Composition for Electrical Steel KR100408110B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62101614A (en) * 1985-10-23 1987-05-12 イー・アイ・デュポン・ドゥ・ヌムール・アンド・カンパニー Bridged polymer fine grain and manufacture
JPH0362843A (en) * 1989-07-31 1991-03-18 Hoechst Gosei Kk Aqueous dispersion composition of internally crosslinked acrylic copolymer and its production
JPH04337301A (en) * 1991-05-15 1992-11-25 Sekisui Plastics Co Ltd Production of fine globular particle having excellent water-dispersible property
JPH06316685A (en) * 1993-02-26 1994-11-15 Mitsui Toatsu Chem Inc Resin composition for lubricating surface treatment or treatment of silicon steel sheet

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62101614A (en) * 1985-10-23 1987-05-12 イー・アイ・デュポン・ドゥ・ヌムール・アンド・カンパニー Bridged polymer fine grain and manufacture
JPH0362843A (en) * 1989-07-31 1991-03-18 Hoechst Gosei Kk Aqueous dispersion composition of internally crosslinked acrylic copolymer and its production
JPH04337301A (en) * 1991-05-15 1992-11-25 Sekisui Plastics Co Ltd Production of fine globular particle having excellent water-dispersible property
JPH06316685A (en) * 1993-02-26 1994-11-15 Mitsui Toatsu Chem Inc Resin composition for lubricating surface treatment or treatment of silicon steel sheet

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