KR100301459B1 - Anti-doming spray coating agent for shadow mask - Google Patents

Anti-doming spray coating agent for shadow mask Download PDF

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Publication number
KR100301459B1
KR100301459B1 KR1019980027894A KR19980027894A KR100301459B1 KR 100301459 B1 KR100301459 B1 KR 100301459B1 KR 1019980027894 A KR1019980027894 A KR 1019980027894A KR 19980027894 A KR19980027894 A KR 19980027894A KR 100301459 B1 KR100301459 B1 KR 100301459B1
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South Korea
Prior art keywords
shadow mask
spray coating
doming
coating agent
hole
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KR1019980027894A
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Korean (ko)
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KR19980072000A (en
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이완두
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이완두
주식회사 유니텍
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/07—Shadow masks
    • H01J2229/0727—Aperture plate
    • H01J2229/0733—Aperture plate characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/07—Shadow masks
    • H01J2229/0727—Aperture plate
    • H01J2229/0777—Coatings

Abstract

PURPOSE: An anti-doming spray coating agent for shadow mask is provided to prevent deformation of a hole of a shadow mask by using a low-priced spray coating agent. CONSTITUTION: A hole of a shadow mask used in a television and a personal computer can be deformed by electrons of electron beam. A temperature of the shadow mask is increased and a diameter of the hole is widened by the electrons since the electrons are collided with an inner face of the shadow mask. In order to prevent a doming phenomenon, a particular anti-doming spray coating agent is applied on the shadow mask. The anti-doming spray coating agent is formed with water of 70 to 72 weight percents, a tungsten oxide of 13 to 15 weight percents, a sodium hydroxide of 2 to 3 weight percents, and a water glass of 13 weight percents.

Description

새도우마스크용 앤티도밍 스프레이코팅제Anti-Doming Spray Coating for Shadow Mask

이 발명은 텔레비젼, 퍼서널 컴퓨터 등의 새도우 마스크(shadow mask)의 홀이 전자의 충돌에 의해 넓어지는 것(doming)을 방지하기 위하여 새도우마스크에 코팅하는 물질에 관한 것이다.The present invention relates to a material for coating a shadow mask to prevent the hole of a shadow mask of a television, a personal computer, or the like from being widened by the collision of electrons.

새도우마스크타입의 칼라픽쳐튜브(color picture tube)는 전자건(electron gun)에서 발사되는 전자빔이 새도우 마스크의 홀(aperture)을 통과하여 인광층(phosphor layer)에 R, G, B 픽셀(pixel)을 형성하게 된다.In the shadow mask type color picture tube, an electron beam emitted from an electron gun passes through the aperture of the shadow mask, and R, G, and B pixels are formed in the phosphor layer. Will form.

이때 전자빔의 일부는 새도우마스크의 홀을 통과하지만, 나머지는 새도우마스크의 내측에 충돌하여 가열하게 된다. 이 결과로 새도우마스크는 열적팽창하고 부풀게 되고, (dome out) 홀의 크기와 위치가 변하게 되는 문제가 있다.At this time, a part of the electron beam passes through the hole of the shadow mask, but the rest hits the inside of the shadow mask and heats it. As a result, the shadow mask is thermally expanded and swollen, and the size and position of the holes are changed.

즉, 약 80wt%의 전자빔이 새도우마스크의 내면에 충돌하여 새도우 마스크의 온도를 약 80℃-90℃까지 상승시키게 되고 홀의 직경은 120-130㎛까지 커지게 된다.That is, about 80 wt% of the electron beam impinges on the inner surface of the shadow mask to raise the temperature of the shadow mask to about 80 ° C.-90 ° C., and the diameter of the hole increases to 120-130 μm.

이를 해결하기 위하여, 새도우마스크에 적용되는 저 팽창계수를 가진 금속들이 제시되고 있고, 이에 더하여 새도우 마스크에 변형방지를 위하여 스프레이코팅 또는 스크린 코팅의 방법으로 홀의 변형을 방지하는 기술(이하 "앤티도밍"이라 한다)이 사용되고 있다.In order to solve this problem, metals having a low coefficient of expansion applied to shadow masks have been proposed, and in addition, a technique of preventing hole deformation by spray coating or screen coating to prevent deformation in shadow masks (hereinafter referred to as "anti-doming" "" Is used.

종래에 스프레이코팅에 적용하는 물질로는 산화비스무스(Bi2O3)를 주 원료로 사용하는 것이 제시되고 있고, 비스무스 적용시 홀은 80-90㎛의 직경이 되는 것으로 나타나고 있다.Conventionally, as a material applied to spray coating, it is proposed to use bismuth oxide (Bi 2 O 3) as a main raw material, and the hole has a diameter of 80-90 μm when applying bismuth.

이때 통상적으로 홀의 직경을 테스트하는 방법은 유니버설테스트기를 사용하는 바, 코팅된 시험용 브라운관을 작동하여 전자빔을 발사시키고, 카메라에 의해 홀을 촬영하고, 이를 컴퓨터에 연결하여 홀의 직경을 검사하는 방법이 적용되고 있다.In this case, the method of testing the diameter of a hole is generally used by a universal tester, which operates a coated test tube to emit an electron beam, photographs the hole by a camera, and connects it to a computer to test the diameter of the hole. It is becoming.

한편, 종래의 비스무스를 사용한 성분비는 산화비스무스(Bi2O3) 16wt%, 물유리(Na2O.nSiO2) 13wt%, 분산제(NCC)1wt%, 순수(H2O) 70wt%를 볼(Al2O3)을 사용하여 볼밀기로 볼밀하여 완성한다.On the other hand, the component ratio using the conventional bismuth bismuth oxide (Bi 2 O 3 ) 16wt%, water glass (Na 2 O.nSiO 2 ) 13wt%, dispersant (NCC) 1wt%, pure water (H 2 O) 70wt% Ball milling using Al 2 O 3 ) is completed.

그러나, 비스무스는 고가의 희귀금속으로 작업단가가 많이 소요된다는 문제점이 있다.However, bismuth has a problem that it takes a lot of work cost as expensive rare metals.

이 발명의 목적은 상기한 바와 같이 새도우마스크의 홀의 변형을 줄일 수 있는 저비용의 스프레이코팅제를 제공하는 것이다.It is an object of the present invention to provide a low cost spray coating agent which can reduce the deformation of the hole of the shadow mask as described above.

이 발명의 다른 목적은 후술하는 실시예를 통해 알 수 있을 것이다.Another object of the present invention will be apparent from the following examples.

상기 목적을 달성하기 위하여, 이 발명에서는 비스무스를 대신하여 산화텅스텐을 앤티도밍용으로 사용하는 것이 특징이다.In order to achieve the above object, the present invention is characterized by using tungsten oxide for anti-doming instead of bismuth.

즉, 이 발명은 물 70-72wt%, 산화텅스텐 13-15wt%, 수산화나트륨 2-3wt%, 물유리 11-15wt%를 성분비로 하는 앤티도밍용 스프레이 코팅액을 제공하는 것이 특징이다.That is, the present invention is characterized by providing an anti-doming spray coating liquid having a composition ratio of water 70-72wt%, tungsten oxide 13-15wt%, sodium hydroxide 2-3wt%, water glass 11-15wt%.

이하, 이 발명에 따른 스프레이코팅액을 제조하는 실시예를 설명한다.Hereinafter, an embodiment of preparing a spray coating liquid according to the present invention will be described.

본 발명에서 산화텅스텐의 성분을 결정함에 있어, 13wt%이하로 하였을 경우에는 도밍효과가 떨어지게 되고, 17wt%이상으로 하는 경우에는 점도가 높아져서 스프레이 작업성이 떨어지는 문제점이 발생하므로 산화텅스텐의 양은 13-17wt%가 적당하였고, 본 실시예에서는 15wt%를 적용하였다.In the present invention, in determining the composition of tungsten oxide, when the wtwt% is less than 13wt%, the dope effect is inferior, and when the wtwt% is more than 17wt%, the viscosity is increased and spray workability is inferior, so the amount of tungsten oxide is 13-. 17 wt% was suitable, and 15 wt% was applied in this example.

또한 부착제 또는 고착제인 물유리는 Na2O.nSiO2또는 K2O.nSiO2를 사용할 수 있으며 11wt%이하를 적용할 경우에는 스프레이코팅시 부착성이 떨어지고, 15wt%이상을 적용할 경우에는 도밍효과가 다운됨은 물론 피막이 딱딱해져서 박리현상이 일어난다는 문제점이 있었다.In addition, the water glass as an adhesive or a fixing agent may use Na 2 O.nSiO 2 or K 2 O.nSiO 2 , and when 11 wt% or less is applied, adhesion is reduced during spray coating, and when doping is applied when 15 wt% or more is applied. As well as the effect is down, there is a problem that the peeling phenomenon occurs due to the film becomes hard.

따라서 이 실시예에서는 Na2O.nSiO213wt%를 적용하였다.Therefore, in this Example, Na 2 O. nSiO 2 13wt% was applied.

한편, 수산화 나트륨(NaOH)은 산화텅스텐을 적용함에 있어서 엉킴을 방지하기위한 강알카리로서 4wt%이상을 적용하면 오히려 엉킴이 생겼으며, 1wt%이하를 적용할 경우에는 효과가 거의 없었으므로 2-3wt%가 적당하였고, 이 실시예에서는 2wt%를 적용하였다.On the other hand, sodium hydroxide (NaOH) is a strong alkali to prevent tangling in the application of tungsten oxide, but when 4wt% or more is applied, it is rather entangled, and when 1wt% or less is applied, it is 2-3wt. % Was suitable and 2wt% was applied in this example.

이 실시예에서 만일 물유리로 K2O.nSiO2를 사용하였다면 KOH를 적용하여야 할 것이고, 물유리로 어느것을 사용하던지 관계없이 CaCO3를 적용할 수 있으나, CO2발생위험이 있어 피하는 것이 좋다.In this example, if K 2 O.nSiO 2 is used as the water glass, KOH should be applied, and CaCO 3 may be applied regardless of which water glass is used, but there is a risk of CO2 generation.

이하에서 상기성분으로 스프레이코팅액을 제조하는 방법을 설명한다.Hereinafter, a method of preparing a spray coating liquid using the above components will be described.

분산 및 혼합을 위해 볼밀작업시 종래에 비스무스를 적용하는 경우에는 엉킴현상이 없어, 볼밀기에 어느것을 먼저 투입하더라도 문제가 발생하지 않았으나, 산화텅스텐을 적용함에 있어서는 산(acid)인 산화텅스텐과 물유리가 먼저 혼합되면 엉킴현상이 발생하므로, 순수(H2O) 14l(70wt%)에 산화텅스텐(WO3) 3kg(15wt%)을 넣고, 엉킴을 방지하기 위하여 수산화나트륨(NaOH) 400g(2wt%)을 넣은 후 물유리(Na2O.nSiO2) 2.6kg(13wt%)을 혼합하여 볼밀기와 같은 분쇄기로 분산 및 혼합시킨다.When bismuth is conventionally applied during ball milling for dispersing and mixing, there is no entanglement, and no problem occurs even if the ball mill is put first, but when applying tungsten oxide, acid is tungsten oxide and water glass. Tungsten occurs when the mixture is mixed first, so 3 kg (15 wt%) of tungsten oxide (WO 3 ) is added to 14 l (70 wt%) of pure water (H 2 O), and 400 g (2 wt%) of sodium hydroxide (NaOH) to prevent tangling. ) Is added and 2.6 kg (13 wt%) of water glass (Na 2 O. nSiO 2 ) is mixed and dispersed and mixed with a grinder such as a ball mill.

이때 볼밀기를 사용할 경우 2ф알루미늄 볼(Al203) 소정량을 볼밀기에 투입하고, 볼밀이 완료되면 순수로 세척한다.In this case, when using a ball mill, 2ф aluminum balls (Al 2 0 3 ) are put in a ball mill, and when the ball mill is completed, it is washed with pure water.

산화텅스텐을 적용하는 본 실시예에서 종래의 약산성인 비스무스에 적용되던 분산제를 적용하지 않는 것은 엉킴을 방지하고 중화시키기 위하여 강알카리인 NaOH를 적용하였기 때문이다.In this embodiment of applying tungsten oxide, the dispersant used in conventional weak acid bismuth is not applied because strong alkali NaOH is applied to prevent entanglement and neutralize.

본 실시예에 의해 완성된 스프레이코팅액을 사용하여 새도우마스크를 스프레이코팅한 새도우마스크를 유니버설테스트기로 검사한 결과, 홀의 직경이 80-90㎛로 종래의 비스무스를 사용하던 방법과 비교하여 거의 비슷한 결과로 앤티도밍효과가 나타났다.The shadow mask sprayed with the shadow mask using the spray coating liquid completed in this embodiment was inspected by a universal tester, and the diameter of the hole was 80-90 µm, which is almost similar to that of the conventional bismuth. Anti-doming effect appeared.

상기 설명한 바와 같이 본 발명에 따라 앤티도밍제로 산화텅스텐을 적용하여 스프레이코팅액을 완성한 결과, 종래의 산화비스무스를 사용한 것과 비교하여 동일한 결과가 나왔으며, 이는 스프레이코팅에 비스무스에 비해 단가가 훨씬 싼 텅스텐이 적용됨으로써 제조단가를 획기적으로 낮출 수 있게 되는 것이다.As described above, as a result of completing the spray coating liquid by applying tungsten oxide with an anti-doming agent according to the present invention, the same result was obtained as compared with the conventional bismuth oxide, which is much lower in unit price than the bismuth spray coating. This will be able to significantly lower the manufacturing cost.

Claims (2)

물 70-72wt%, 산화텅스텐 13-15wt%, 수산화나트륨 2-3wt%, 물유리 11-15wt%를 포함하여 이루어지는 새도우마스크용 스프레이코팅제Spray coating agent for shadow mask comprising 70-72wt% water, 13-15wt% tungsten oxide, 2-3wt% sodium hydroxide, 11-15wt% water glass 물 70-72wt%, 산화텅스텐 13-15wt%, 수산화칼륨 2-3wt%, 물유리 11-15wt%를 포함하여 이루어지는 새도우마스크용 스프레이코팅제Spray coating agent for shadow masks comprising water 70-72wt%, tungsten oxide 13-15wt%, potassium hydroxide 2-3wt%, water glass 11-15wt%
KR1019980027894A 1998-07-10 1998-07-10 Anti-doming spray coating agent for shadow mask KR100301459B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0554814A (en) * 1991-08-26 1993-03-05 Mitsubishi Electric Corp Shadow mask type color cathode-ray tube

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0554814A (en) * 1991-08-26 1993-03-05 Mitsubishi Electric Corp Shadow mask type color cathode-ray tube

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