AU5713999A - Binding agent system based on water glass - Google Patents
Binding agent system based on water glass Download PDFInfo
- Publication number
- AU5713999A AU5713999A AU57139/99A AU5713999A AU5713999A AU 5713999 A AU5713999 A AU 5713999A AU 57139/99 A AU57139/99 A AU 57139/99A AU 5713999 A AU5713999 A AU 5713999A AU 5713999 A AU5713999 A AU 5713999A
- Authority
- AU
- Australia
- Prior art keywords
- binding agent
- agent system
- added
- water glass
- system based
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000011230 binding agent Substances 0.000 title claims description 24
- 235000019353 potassium silicate Nutrition 0.000 title claims description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 title claims description 6
- 239000011734 sodium Substances 0.000 claims description 7
- 239000002585 base Substances 0.000 claims description 6
- 229920002545 silicone oil Polymers 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000004094 surface-active agent Substances 0.000 claims description 4
- 150000003385 sodium Chemical class 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 229910052910 alkali metal silicate Inorganic materials 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 238000009835 boiling Methods 0.000 claims description 2
- 239000000839 emulsion Substances 0.000 claims description 2
- 150000002500 ions Chemical class 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 235000009917 Crataegus X brevipes Nutrition 0.000 claims 1
- 235000013204 Crataegus X haemacarpa Nutrition 0.000 claims 1
- 235000009685 Crataegus X maligna Nutrition 0.000 claims 1
- 235000009444 Crataegus X rubrocarnea Nutrition 0.000 claims 1
- 235000009486 Crataegus bullatus Nutrition 0.000 claims 1
- 235000017181 Crataegus chrysocarpa Nutrition 0.000 claims 1
- 235000009682 Crataegus limnophila Nutrition 0.000 claims 1
- 235000004423 Crataegus monogyna Nutrition 0.000 claims 1
- 240000000171 Crataegus monogyna Species 0.000 claims 1
- 235000002313 Crataegus paludosa Nutrition 0.000 claims 1
- 235000009840 Crataegus x incaedua Nutrition 0.000 claims 1
- 229910004298 SiO 2 Inorganic materials 0.000 claims 1
- 239000003513 alkali Substances 0.000 claims 1
- 239000004576 sand Substances 0.000 description 16
- 238000000465 moulding Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Mold Materials And Core Materials (AREA)
Description
r/uulu i 28//91 Regulation 3.2(2)
AUSTRALIA
Patents Act 1990
ORIGINAL
COMPLETE SPECIFICATION STANDARD PATENT o 9 Application Number: Lodged: Invention Title: BINDING AGENT SYSTEM BASED ON WATER GLASS 9 9* 9. 9 .9 9 I. 9 9.
The following statement is a full description of this invention, including the best method of performing it known to us 2 Binding agent system based on water glass Description The invention relates to a binder for producing core mouldings for foundry purposes.
Binders form part of a moulding material which, under certain conditions such a moistening, swelling and silicate formation, ensures the bonding between the individual grains of sand. Apart from pure swelling binders and ceramic binders, use is also made of chemical binders based on water glass or on synthetic resin, which binders react to one another and harden in the process.
Prior art binders are either not sufficiently stable or 0* they have undesirable side effects and/or generate waste products which place the environment at risk. It has therefore been found that an advantageous comprise consists in moulding materials which, via dehydration, form solid pha- S4.: see and harden in the process. However, it is not always easy to control the hardening processes in such a way that they first occur in the core box. Especially in modern core forming machines, there exists a risk of early hardening of the moulding sand. In consequence, the required good flow properties of the sand while flowing into the core box are not always achieved.
It is the object of the present invention to develop a binding agent additive for moulding sands, which additive has the desired properties and, in particular, is suitable for being used in core moulding machines.
In accordance with the invention, the objective is achieved 3 by the characteristics listed in the Claims.
The new binding agent system based on water glass consists of an aqueous alkali silicate solution of the general composition: xSiOz x yM20 x zH 2 O, with M representing the alkaii ions Li* K* or Na* and is characterised in that it additionally contains a hygroscopic base. In an advantageous embodiment, the hygroscopic base is provided in the form of a sodium lye in the ratio of 1 4 to 1 6. If the modulus of Na2O/SiO amounts to 2.5 to 3.5 with a solid substance content of 20 to 40 it is possible, under any operating conditions, to prevent the moulding sand from hardening prematurely. According to a preferred embodiment it is proposed to provide the hygroscopic base in the form of a 30% sodium lye in an aqueous solution. To be able to control the hygroscopic properties, it is preferable to use S: a surface-active substance.,If the surface-active substance is added to the binding agent system in the form of silicone oil with a boiling point of 250 the flowing ability of the moulding sand can be improved considerably. In an advantageous embodiment, an emulsion solution with 8 to silicone oil with reference to the quantity of binder is added to the binding agent system.
Below, the invention will be explained in greater detail with refernce to a comparative example, using a core moulding machine according to Figure 1, which is designed as follows: The core moulding machine consists of a vertically arranged housing A to which there is flanged a horizontal air inlet B. The air inlet is controlled by an air inlet valve 1 with a large surface, and there exists an increased air pressure in the air storage tank 5. When opening the air inlet valve 1, the air pressure reaches the machine chamber 10 of the housing A, in which chamber 10 there is vertically arranged a slotted sand cylinder 6. The sand cylinder 6 is connected to a sand storage container 3 which can be emptied via a slide 4.
-4 When the air inlet valve is actuated, sand is conveyed from the slotted sand cylinder 6 into the moulding head 7 with the sand exit opening, and enters the core box 8, with a core sand ventilator 9 ensuring the compaction of the core sand 11.
To be able to assess the moisture content of the moulding sand, a moisture measuring device is integrated into the air exit valve 2. By using this assembly, it was found that the moulding sand in accordance with the invention achieved much higher moisture contents and thus an improved viscosity and an improved flowing ability of the moulding sand.
°-S
*S
1
Claims (7)
1. A binding agent system based on water glass, consi- sting of an aqueous alkali silicate solution of the general compositions xSiO 2 x yM20 x zH 2 O, with M re- S' presenting the alkali ions Li*, K* or Na*, characterised in that the binding agent system additionally contains a hygroscopic base.
2. A binding agent according to claim 1, S. characterised in that the hygroscopic base is added in the form of a sodium lye in the ratio of 1 t 4 to 1 a 6.
3. A binding agent system according to any one of the preceding claims, characterised in that the modulus of Na 2 O/SiO 2 amounts to 2.5 to with a solid substance content of 20 to
4. A binding agent system according to any one of the preceding claims, characterised in I 6 that the hydroscopic base is added in the form of a sodium lye in an aqueous solution.
A binding agent system according to any one of the preceding claims, characterised in that for the purpose of controlling the hygroscopic properties, there is added a surface-active substance.
6. A binding agent substance according to any one of the preceding claims, characterised in that the surface-active substance is added in the form of silicone oil with a boiling point of 250
7. A binding agent system according to any one of the preceding claims, characterised in that there is added an emulsion solution with 8 to silicone oil relative to the quantity of binding agent. DATED this 29th day of October 1999. VAW MOTOR GMBH WATERMARK PATENT TRADEMARK ATTORNEYS 290 BURWOOD ROAD HAWTHORN. VIC. 3122.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU57139/99A AU5713999A (en) | 1999-10-29 | 1999-10-29 | Binding agent system based on water glass |
| AU2005203130A AU2005203130B2 (en) | 1999-10-29 | 2005-07-19 | Binding agent system based on water glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU57139/99A AU5713999A (en) | 1999-10-29 | 1999-10-29 | Binding agent system based on water glass |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2005203130A Division AU2005203130B2 (en) | 1999-10-29 | 2005-07-19 | Binding agent system based on water glass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU5713999A true AU5713999A (en) | 2001-05-03 |
Family
ID=3742615
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU57139/99A Abandoned AU5713999A (en) | 1999-10-29 | 1999-10-29 | Binding agent system based on water glass |
| AU2005203130A Ceased AU2005203130B2 (en) | 1999-10-29 | 2005-07-19 | Binding agent system based on water glass |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2005203130A Ceased AU2005203130B2 (en) | 1999-10-29 | 2005-07-19 | Binding agent system based on water glass |
Country Status (1)
| Country | Link |
|---|---|
| AU (2) | AU5713999A (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB857132A (en) * | 1958-01-16 | 1960-12-29 | Midland Silicones Ltd | Improvements in or relating to foundry sand compositions |
| GB1017744A (en) * | 1964-03-10 | 1966-01-19 | Gen Refractories Ltd | Improvements in or relating to bonded refractory materials |
| GB1122307A (en) * | 1965-07-19 | 1968-08-07 | Foseco Trading Ag | Production of moulds for metal casting |
-
1999
- 1999-10-29 AU AU57139/99A patent/AU5713999A/en not_active Abandoned
-
2005
- 2005-07-19 AU AU2005203130A patent/AU2005203130B2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| AU2005203130A8 (en) | 2008-09-11 |
| AU2005203130A1 (en) | 2005-08-11 |
| AU2005203130B2 (en) | 2008-08-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PC1 | Assignment before grant (sect. 113) |
Free format text: VAW ALUMINIUM AG |
|
| TH | Corrigenda |
Free format text: IN VOL 14, NO 1, PAGE(S) 121 UNDER THE HEADING ASSIGNMENTS BEFORE GRANT, SECTION 113 THE NAME OF THE ASSIGNEE IN REGARD TO PATENT APPLICATION NUMBER 57139/99 SHOULD READ VAW ALUMINIUM AG |