KR20010038878A - Binding agent system based on water glass - Google Patents

Binding agent system based on water glass Download PDF

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Publication number
KR20010038878A
KR20010038878A KR1019990047039A KR19990047039A KR20010038878A KR 20010038878 A KR20010038878 A KR 20010038878A KR 1019990047039 A KR1019990047039 A KR 1019990047039A KR 19990047039 A KR19990047039 A KR 19990047039A KR 20010038878 A KR20010038878 A KR 20010038878A
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South Korea
Prior art keywords
binder
molding
water glass
core
sand
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KR1019990047039A
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Korean (ko)
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KR100342918B1 (en
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토마스슈타인호이저
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바우 알루미늄 아게
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
    • B22C1/10—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives for influencing the hardening tendency of the mould material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
    • B22C1/186—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents contaming ammonium or metal silicates, silica sols
    • B22C1/188—Alkali metal silicates

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)

Abstract

PURPOSE: A coupler system based on water glass is provided to suitably apply the system on a core molding apparatus to improve performance of the coupler additive for sands in the molding apparatus, especially, increase flowing ability of the molding sands. CONSTITUTION: The coupler system comprises water glass consisting of aqueous alkaline silicate solution represented by xSiO2 x yM2O x zH2O (wherein M means alkaline ions such as Li+, K+ or Na+). The system further contains absorbent basic materials such as sodium alkaline solution in a ratio of 1:4 to 1:6 based on the system. The system may include 20-40wt.% of solid materials such as Na2O/SiO2 in a ratio of 2.5 to 3.5. The couplyer system is useful for the molding apparatus comprising a suction valve(1), a chamber(10), a storage tank(5), a slide(4), a sand cylinder(6), a molding head(7), a core box(8), a sand fan(9) and core sands(11).

Description

물유리에 기초한 결합제 시스템{Binding agent system based on water glass}Binding agent system based on water glass

본 발명은 주물 공장(foundry)용으로 코어 몰딩을 산출하는 결합제에 관한 것이다.The present invention relates to a binder that yields a core molding for foundry.

몰딩 재료의 일부를 형성하는 결합제는 습윤성(moistening), 팽창성(swelling)의 실리케이트를 형성하는 것과 같은 어떤 조건하에서, 개별적 모래 입자들 간의 결합력을 제공한다. 순수한 팽창성 결합제 및 세라믹 결합제와 별개로, 물유리 또는 합성 수지를 기초로하는 화학 결합제를 사용하는 경우, 결합제는 공정중에 서로 반응하여 경화된다.The binder forming part of the molding material provides a bond between the individual sand particles under certain conditions, such as forming a moistening, swelling silicate. Apart from purely expandable binders and ceramic binders, when chemical binders based on water glass or synthetic resins are used, the binders react with one another during the process to cure.

종래 기술의 결합제는 충분히 안정하지 않거나 또는 바람직하지 못한 부작용 및/또는 주위를 위험한 상태로 만드는 생산품 폐기물을 발생시킨다. 따라서 탈수 작용을 통해 처리 공정시에 고체 상태로 경화되게 만드는 몰딩 재료로 구성되는 것을 포함하는 것이 유리하다는 것을 알 수 있다. 그러나, 코어 박스에서 경화 작용이 먼저 일어나는 방식으로 경화작용을 항상 제어하기가 쉽지 않다. 특히 최근의 코어 형성 장치는, 몰딩 모래가 초기에 경화되는 단점이 있다. 결과적으로, 코어 박스 속으로 흘러가는 동안에 요구되는 모래의 양호한 유동성이 항상 달성되는 것은 아니다.Prior art binders produce product wastes that are not sufficiently stable or have undesirable side effects and / or environmental hazards. It can thus be seen that it is advantageous to include what consists of a molding material which is made to cure in the solid state during the treatment process through the dehydration action. However, it is not always easy to control the curing action in such a way that the curing action takes place first in the core box. In particular, the core forming apparatus of recent years has the disadvantage that the molding sand is initially cured. As a result, the good flowability of the sand required while flowing into the core box is not always achieved.

본 발명의 목적은 몰딩 모래를 위한 결합제 첨가물을 개선시켜 첨가제가 바람직한 특성을 갖추고, 특히 코어 몰딩 장치에서 사용하기에 적합하게 하는 것이다.It is an object of the present invention to improve the binder additive for molding sand so that the additive has the desired properties, in particular suitable for use in the core molding apparatus.

발명에 따라서, 목적은 청구항에 열거된 특징부에 의해 달성된다.According to the invention, the object is achieved by the features listed in the claims.

물유리에 기초한 새로운 결합제 시스템은 xSiO2x yM2O x zH2O의 일반적 조성물의 수성 알칼리 실리케이트 용액으로 구성되며 M은 알칼리 이온 Li+, K+또는 Na+를 나타내며 첨가적으로 흡습성 염기를 함유한다. 바람직한 실시예에서, 흡습성 염기는 1:4 내지 1:6 비율의 나트륨 알칼리액 형태로 제공된다. Na2O/SiO2의 비율이 2.5 내지 3.5로 고형 물질 함량이 20 내지 40%인 경우, 어떠한 작업 조건하에서라도, 몰딩 모래가 때 이르게 경화되는 것을 방지할 수 있다. 바람직한 실시예에 따라서, 수성액에 30%의 나트륨 알칼리액 형태인 흡습성 염기를 제공하도록 제안했다. 흡습성을 제어하기 위해서, 표면-활성 물질을 사용하는 것이 바람직하다. 표면-활성 물질이 250°이상인 실리콘 오일 형태의 결합제 시스템인 경우, 몰딩 모래의 유동도는 상당히 향상될 것이다. 바람직한 실시예에서는, 결합제량을 기준으로 8 내지 10%의 실리콘 오일의 유상액을 결합제 시스템에 첨가한다.The new binding agent system based on water glass is composed of an aqueous alkali silicate solution of the general composition of the xSiO 2 x yM 2 O x zH 2 O M is an alkali ions Li +, shows a K + or Na + contains a hygroscopic base by adding ever . In a preferred embodiment, the hygroscopic base is provided in the form of sodium alkaline solution in a ratio of 1: 4 to 1: 6. When the ratio of Na 2 O / SiO 2 is 2.5 to 3.5 and the solid matter content is 20 to 40%, it is possible to prevent the molding sand from prematurely curing under any working conditions. According to a preferred embodiment, it was proposed to provide an aqueous solution with a hygroscopic base in the form of 30% sodium alkaline solution. In order to control hygroscopicity, it is preferable to use surface-active substances. If the surface-active substance is a binder system in the form of a silicone oil of 250 ° or more, the flow of molding sand will be significantly improved. In a preferred embodiment, an emulsion of 8-10% silicone oil, based on the amount of binder, is added to the binder system.

도 1은 코어 몰딩 장치를 나타낸 것이다.1 shows a core molding apparatus.

이하 발명은 이하 설명되는 도 1에 따른 코어 몰딩 장치를 이용하여 비교예를 참조로 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail with reference to a comparative example using the core molding apparatus according to FIG. 1 described below.

코어 몰딩 장치는 수평의 공기 흡입구 B가 플랜지처리된 수직으로 배열된 하우징 A으로 구성된다 공기 흡입구는 넓은 표면이 있는 공기 흡입 밸브(1)에 의해 제어되고, 여기에는 공기 저장 탱크(5)에 증가된 공기압이 존재한다. 공기 흡입 밸브(1)가 개방되면, 공기압은 하우징 A의 장치 챔버(10)에 이르며, 챔버(10)에는 수직적으로 배열된 가는홈이 있는 모래(sand) 실린더(6)가 있다. 모래 실린더(6)는 슬라이드(4)를 경유하여 비워질 수 있는 모래 저장 콘테이너(3)에 연결된다.The core molding device consists of a vertically arranged housing A in which a horizontal air inlet B is flanged. The air inlet is controlled by an air intake valve 1 with a large surface, which is increased in the air storage tank 5. Air pressure is present. When the air intake valve 1 is opened, the air pressure reaches the device chamber 10 of the housing A, where the chamber 10 has a vertically arranged sand cylinder 6. The sand cylinder 6 is connected to a sand storage container 3 which can be emptied via the slide 4.

공기 흡입 밸브가 작동하면, 모래는 가는홈이 있는 모래 실린더(6)로부터 샌드 출구 구멍이있는 몰딩 헤드(7)로 옮겨져 코어 박스(8)로 들어가 코어 모래 통풍기(9)가 코어 모래(11)의 압밀 작용을 이룬다.When the air intake valve is actuated, sand is transferred from the sand cylinder (6) with fine grooves to the molding head (7) with sand outlet holes and into the core box (8) so that the core sand vent (9) is the core sand (11). Achieve consolidation.

몰딩 모레의 수분 함유량을 측정하기 위해서, 공기 배출 밸브(2)에 수분 측정 장치가 구성된다.In order to measure the water content of the molding mower, a moisture measuring device is configured in the air discharge valve 2.

본 장치를 사용함으로써 발명에 따른 몰딩 모래는 수분 함유량이 높아 점착성이 개선되어 몰딩 모래의 유동도(flowing ability)가 개선된다는 것을 알 수 있다.It can be seen that by using this apparatus, the molding sand according to the invention has a high water content and thus improves adhesiveness, thereby improving the flowability of the molding sand.

Claims (7)

알칼리 이온 Li+, K+또는 Na+로 대표되는 xSiO2x yM2O x zH2O의 일반적인 조성물의 수성 알칼리 실리케이트 용액으로 구성된 물유리에 기초한 결합제에 있어서, 결합제 시스템이 첨가적으로 흡습성 염기를 함유하는 것을 특징으로 하는 결합제.In the alkali ions Li +, K + or Na + xSiO 2 x yM 2 O x zH binder based on water glass consisting of an aqueous alkali silicate solution of a typical composition of the 2 O as represented by, the binder system is the addition of ever containing a hygroscopic base A binder, characterized in that. 제 1 항에 있어서, 흡습성 염기가 1: 4 내지 1:6 비율로 나트륨 알칼리액의 형태로 첨가되는 것을 특징으로 하는 결합제.2. The binder according to claim 1, wherein the hygroscopic base is added in the form of sodium alkaline solution in a ratio of 1: 4 to 1: 6. 제 1 항 또는 제 2 항에 있어서, Na2O/SiO2의 비율이 2.5 내지 3.5로 고형 물질 함량이 20 내지 40%인 것을 특징으로 하는 결합제.The binder according to claim 1 or 2, wherein the ratio of Na 2 O / SiO 2 is 2.5 to 3.5 and the solid matter content is 20 to 40%. 제 1 항 내지 제 3 항중 어느 한 항에 있어서, 흡습성 염기가 수성액에 30%의 나트륨 알칼리 형태로 첨가되는 것을 특징으로 하는 결합제.4. The binder according to any one of claims 1 to 3, wherein the hygroscopic base is added to the aqueous liquid in the form of 30% sodium alkali. 제 1 항 내지 제 4 항중 어느 한 항에 있어서, 흡습성을 제어하기 위하여, 표면-활성 물질을 첨가하는 것을 특징으로 하는 결합제.The binder according to any one of claims 1 to 4, wherein a surface-active substance is added to control hygroscopicity. 제 1 항 내지 제 5 항중 어느 한 항에 있어서, 끓는점이 250°이상인 실리콘 오일 형태의 표면-활성 물질을 첨가하는 것을 특징으로 하는 결합제.The binder according to any one of claims 1 to 5, wherein a surface-active substance in the form of a silicone oil having a boiling point of at least 250 ° is added. 제 1 항 내지 제 6 항중 어느 한 항에 있어서, 결합제 양을 기준으로 10%의 실리콘 오일을 유상액에 첨가하는 것을 특징으로 하는 결합제.7. The binder according to any one of claims 1 to 6, wherein 10% silicone oil is added to the emulsion based on the amount of binder.
KR1019990047039A 1999-10-28 1999-10-28 Binding agent system based on water glass KR100342918B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170022706A (en) 2015-08-21 2017-03-02 엘에스오토모티브 주식회사 Electric magnet door closing method and system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170022706A (en) 2015-08-21 2017-03-02 엘에스오토모티브 주식회사 Electric magnet door closing method and system

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