KR100342918B1 - Binding agent system based on water glass - Google Patents
Binding agent system based on water glass Download PDFInfo
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- KR100342918B1 KR100342918B1 KR1019990047039A KR19990047039A KR100342918B1 KR 100342918 B1 KR100342918 B1 KR 100342918B1 KR 1019990047039 A KR1019990047039 A KR 1019990047039A KR 19990047039 A KR19990047039 A KR 19990047039A KR 100342918 B1 KR100342918 B1 KR 100342918B1
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- Prior art keywords
- binder
- added
- water glass
- sand
- ratio
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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
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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
- B22C1/16—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
본 발명은, 일반식 xSiO2·yM2O ·zH2O(M은 알칼리 이온 Li+, K+또는 Na+을 나타낸다)의 알칼리 규산염 수용액으로 이루어지고 흡습제를 부가적으로 함유하는, 물유리(water glass)에 기초한 결합제에 관한 것이다.The present invention, formula xSiO 2 · yM 2 O · zH 2 O is composed of the alkali silicate aqueous solution (M = alkali ions Li +, K +, or the Na + shows) containing a moisture absorbent in addition, water glass (water to a binder based on glass).
Description
본 발명은 주조용 코어 몰딩(core moulding)을 제조하기 위한 결합제에 관한 것이다.The present invention relates to a binder for producing a core molding for casting.
결합제는 주형(鑄型) 재료의 일부이고, 어떤 조건하에서는, 습기 부여, 팽윤 및 규산염 형성과 같은 작용을 가지고, 개개의 주물사(鑄物砂)들을 결합시킨다. 순수한 팽윤 결합제 및 세라믹 결합제와는 별도로, 물유리 또는 합성 수지에 기초한 화학물질 결합제도 사용되고, 이들 결합제는 주형 제작공정에서 서로 반응하여 경화한다.The binder is part of the mold material and, under certain conditions, has the same action as moisturizing, swelling and silicate formation and binds the individual foundry sands. Apart from pure swelling binders and ceramic binders, chemical binders based on water glass or synthetic resins are also used, and these binders react with one another in the mold fabrication process to cure.
종래 기술의 결합제는 충분히 안정하지 않거나, 또는 바람직하지 않은 부작용을 가지고, 환경상 문제가 되는 폐기물을 발생시킨다. 따라서, 주형 제작공정에서 탈수에 의해 고상(固相)을 형성하고 경화하는 주형 재료가 유리한 것으로 밝혀졌다. 그러나, 경화 공정이 코어 박스 내에서 먼저 일어나도록 하는 방식으로 그 경화 공정을 제어하는 것이 항상 쉽지 않다. 특히 현재의 코어 제조기에서는, 주물사(鑄物砂)가 조기에 경화할 위험성이 있다. 따라서, 코어 박스 내로 유동하는 동안의 주물사의 요구되는 양호한 유동성이 항상 달성되지 않는다.Prior art binders are not sufficiently stable or have undesirable side effects and generate environmentally hazardous waste. Accordingly, it has been found that a molding material which forms and hardens a solid phase by dehydration in a molding manufacturing process is advantageous. However, it is not always easy to control the curing process in such a way that the curing process occurs first in the core box. In particular, in the present core manufacturing machine, there is a risk that the foundry sand hardens prematurely. Therefore, the required good fluidity of the foundry sand during the flow into the core box is not always achieved.
본 발명의 목적은, 바람직한 특성을 가지고 코어 몰딩 제조기에서 사용되는데 특히 적합한 주물사 첨가용 결합제를 제공하는데 있다.It is an object of the present invention to provide a binder for molding sand addition which is particularly suitable for use in core molding machines with desirable properties.
상기 목적을 달성하기 위한 본 발명에 따른 결합제는 특허청구범위의 청구항들에 기재된 바와 같은 특징들을 가진다.The binder according to the invention for achieving the above object has the features as described in the claims of the claims.
본 발명에 따른 물유리에 기초한 결합제는, 일반식 xSiO2·yM2O ·zH2O(M은 알칼리 이온 Li+, K+또는 Na+을 나타낸다)의 알칼리 규산염 수용액으로 이루어지고, 흡습제를 부가적으로 함유하는 것을 특징으로 한다. 바람직한 실시예에서, 상기 흡습제는 1 : 4 내지 1 : 6의 비율(즉, 흡습제 1에 대하여 결합제 4의 비율 내지 흡습제 1에 대하여 결합제 6의 비율)로 나트륨 함유물(sodium lye)의 형태로 상기 결합제에 첨가된다. 알칼리 규산염 수용액 중의 Na2O/SiO2의 율(중량비율)이 2.5 내지 3.5(고형분: 20 내지 40%)이면, 어떤 조업 조건하에서는, 주물사가 조기에 경화하는 것을 방지하는 것이 가능하다. 바람직한 실시예에 따르면, 30% 나트륨 함유물 수용액의 형태로 흡습제를 제공하는 것이 제안된다. 흡습성을 제어하기 위해, 계면 활성제를 사용하는 것이 바람직하다. 계면 활성제가 250°이상의 비등점을 가지는 실리콘 오일의 형태로 결합제에 첨가되면, 주물사의 유동성이 현저하게 개선될 수 있다. 바람직한 실시예에서, 상기 결합제의 양에 대하여 8 내지 10%의 실리콘 오일을 함유하는 에멀션 용액이 상기 결합제에 첨가된다.The binder is based on water-glass according to the present invention, the formula xSiO 2 · yM 2 O · zH 2 O is composed of the alkali silicate aqueous solution (M = alkali ions Li +, it shows a K + or Na +), adding an absorbent enemy It is characterized by containing. In a preferred embodiment, the absorbent is in the form of a sodium lye in a ratio of 1: 4 to 1: 6 (ie, the ratio of binder 4 to absorbent 1 to the ratio of binder 6 to absorbent 1). Is added to the binder. If the ratio (weight ratio) of Na 2 O / SiO 2 in the alkali silicate aqueous solution is 2.5 to 3.5 (solid content: 20 to 40%), it is possible to prevent the foundry sand from curing early under certain operating conditions. According to a preferred embodiment, it is proposed to provide a hygroscopic agent in the form of a 30% sodium-containing aqueous solution. In order to control hygroscopicity, it is preferable to use surfactant. If the surfactant is added to the binder in the form of a silicone oil having a boiling point of 250 ° or more, the fluidity of the foundry sand can be significantly improved. In a preferred embodiment, an emulsion solution containing 8 to 10% silicone oil relative to the amount of binder is added to the binder.
도 1은 코어 몰딩 제조기를 나타낸다.1 shows a core molding machine.
이하, 도 1에 나타낸 코어 몰딩 제조기를 사용하는 실시예에 의거하여 본 발명을 더 상세히 설명한다.Hereinafter, the present invention will be described in more detail based on the embodiment using the core molding machine shown in FIG.
코어 몰딩 제조기는 수직방향으로 배치된 하우징(A)으로 구성되고, 그 하우징에 수평방향의 공기 도입구(B)가 플랜지로 결합되어 있다. 그 공기 도입구(B)는 큰 표면을 가진 공기 도입 밸브(1)에 의해 제어되고, 공기 저장 탱크(5)내에는 증가된 공기압(P1)이 존재한다. 공기 도입 밸브(1)를 개방하면, 공기압이 하우징(A)의 기계실(machine chamber)(10)에 도달한다(부호 P2는 기계실(10)내의 공기압을 나타낸다). 그 기계실(10)내에는, 슬롯이 형성된 모래 실린더(6)가 수직방향으로 배치되어 있다. 그 모래 실린더(6)는 모래 저장 콘테이너(3)에 연결되어 있고, 그 모래 저장 콘테이너(3)는 슬라이드(4)의 조작에 의해 비워질 수 있다.The core molding machine consists of a housing (A) arranged in the vertical direction, the horizontal air inlet (B) is coupled to the housing by a flange. The air inlet B is controlled by an air inlet valve 1 with a large surface, and there is an increased air pressure P 1 in the air storage tank 5. When the air inlet valve 1 is opened, the air pressure reaches the machine chamber 10 of the housing A (the symbol P 2 represents the air pressure in the machine chamber 10). In the machine room 10, a slotted sand cylinder 6 is arranged in the vertical direction. The sand cylinder 6 is connected to a sand storage container 3, and the sand storage container 3 can be emptied by the operation of the slide 4.
공기 도입 밸브(1)가 작동하면, 모래는 모래 실린더(6)로부터 몰딩 헤드(7)내로 이송되고, 그 몰딩 헤드의 모래 출구를 통하여 코어 박스(8)로 들어간다.(부호 P3는 코어 박스(8)내의 공기압을 나타낸다). 그 코어 박스(8)에는, 그 코어 박스 내에서의 코어 모래(11)의 다짐(compaction)을 보증하는 코어 모래 통풍기(ventilator)(9a, 9b)가 제공되어 있다.If the air introduction valve (1) operation, the sand is fed into the molding head 7 from the sand cylinder 6, to enter the core box (8) via the sand outlet of the molding head (sign P 3 is a core box (8) shows the air pressure). The core box 8 is provided with core sand ventilators 9a and 9b which ensure compaction of the core sand 11 in the core box.
주물사의 수분 함유량을 측정하기 위해, 수분 측정 장치가 공기 출구 밸브(2)내에 설치되어 있다.In order to measure the water content of the molding sand, a moisture measuring device is provided in the air outlet valve 2.
상기 장치를 사용함으로써, 본 발명에 따른 결합제를 함유하는 주물사는 매우 높은 수분 함유량을 달성하여, 주물사의 개선된 점도와 개선된 유동성을 달성할 수 있다.By using the apparatus, the foundry sand containing the binder according to the present invention can achieve very high water content, thereby achieving improved viscosity and improved flowability of the foundry sand.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019990047039A KR100342918B1 (en) | 1999-10-28 | 1999-10-28 | Binding agent system based on water glass |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019990047039A KR100342918B1 (en) | 1999-10-28 | 1999-10-28 | Binding agent system based on water glass |
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| Publication Number | Publication Date |
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| KR20010038878A KR20010038878A (en) | 2001-05-15 |
| KR100342918B1 true KR100342918B1 (en) | 2002-07-04 |
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| KR20170022706A (en) | 2015-08-21 | 2017-03-02 | 엘에스오토모티브 주식회사 | Electric magnet door closing method and system |
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