JPS58501368A - organic mineral binder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] organic mineral binder Technical field of invention The present invention relates to foundry technology, and more particularly to organic minerals used in the production of foundry sand and core sand. Concerning caking materials for things.

Description of prior art Currently known silicate binders do not contain foundry sand or binders that can be easily removed from the casting. and cannot produce core sand. Sands based on silicate binders are not Despite having favorable cleanliness and hygienic properties to prevent Currently, such sand has been used only for the production of medium and large size castings. Currently, the problem of improving the knockout properties of sand has been solved by the following different methods. It is. a) Under the influence of the temperature of the metal cast in the mold, it decomposes and creating stress concentrations in the silicate binder film or silicate binder Various additives are included in the sand composition to create a ternary refractory system that increases the melting temperature of the sand. b) A method of mixing organic additives into liquid glass to form a true solution with it. How to do it.

An exemplary mixture of the first of the above-mentioned methods is Mention may be made for the production of casting molds and cores with the following composition: Weight Quartz sand 92.0-94.0, liquid glass 4.5-5.5, caustic saw 0.9-1.1 and selectively processed extracts of petroleum distillates 0.8-1.0 The knockout properties of sand can be slightly improved by the presence of extracts. I can do it. However, at the same time extractives tend to form gases in the sand at high levels. Therefore, there is a risk of gas defects developing in castings, especially in steel castings. Ru.

The second method to improve knockout properties is to directly mix additives by mechanical mixing. The method of incorporation into wetted glass is also widely applied in foundries. this method As a result of the implementation of A binding material is obtained.

The caking agent “Hydrosil J” known in the art is a heavy Liquid glass 80-85 (r=1.48-1.52g/am ”, m = 2.6-2.8) and the double salt of glucose with sodium chloride ([height Roll J (Hydrol)) 15-20. Caking material “Hydrosil” by mechanically mixing with liquid glastohytrol for 15 to 30 minutes. can be manufactured. Even with the use of "Hydrosil" in the sand composition, the castings It is not possible to knock the core effectively enough. This is related to the following fact: related. In other words, Hytrol does not mix into the liquid glass, and the liquid metal is not mixed into the mold. At the normal temperature inside the mold during casting, the binder film cannot be broken from the beginning. do not have. Furthermore, since Hytrol is a cattle feed that is difficult to obtain, the organic mineral binder composition The content of Hytrol in the product must be kept as low as possible.

The present invention has a composition that allows molding sand and core sand to be easily knocked out from castings. For the purpose of providing organic mineral binders for the production of foundry sand and core sand with selected contents. shall be.

This objective is achieved as follows. That is, bulk silicate, water, and liquid iron. and a water-soluble organic additive that can be decomposed at the casting temperature, according to the invention. Made of foundry sand and core sand with these components present in the following weight percentages: This is achieved by using organic mineral binders for construction.

Massive silicate - 46 to 54, water-soluble organic additive - ○, 3 to 4.0, water - balance.

Detailed description of the invention Temperature from 180 to 240°C and 0.4 to 0.8 MPa in autoclave While dissolving the bulk silicate in water under the pressure of Additives are incorporated into the binder composition. As a result of this process, the organic water-soluble additive is Characterized by the fact that thorium or potassium silicate is incorporated into micelles A new organic mineral binder is produced. This is the unique structure of this caking material. and is the cause of the property. Water-soluble organic additives are essential for silicate micelles as binders Due to the fact that it is a component, under the influence of high temperatures, this additive decomposes and gas formation Forming objects and breaking the original binder film. Produced during the decomposition of organic components Coke compounds prevent the binder film from melting. Everything is made of foundry sand and Knockout from castings by applying organic binders into the core sand composition It has a fairly high efficiency in improving the properties.

The content of water-soluble organic additives is within the range of 0.3 to 4.0% by weight. this amount When reduced below the minimum limit, nozzles from 1114IJ of sand containing silicate binders The desired effect of improving the pull-out property cannot be obtained, and on the other hand, this content cannot be controlled to the maximum. If the limit is exceeded, sand will fall off.

The content of bulk silicate should be in the range 46-54% by weight. bulk silicate If the amount of % by weight significantly slows down the rate of dissolution of bulk silicates in water. This will delay the manufacturing process of organic mineral binder.

Hytrol as a water-soluble organic additive in an amount of 2.0 to 4.0% by weight, an organic mineral It is suitable for use in addition to the binder component.

The production of the organic mineral binder according to the present invention is carried out in an autoclave under the above-mentioned conditions. It will be done.

The action mechanism of the sand containing organic mineral binder according to the present invention is that it contains reducing substances up to Due to the fact that the silicates under the influence of high temperatures (up to SOO ℃) decomposes in the micellar components to form a significant amount of gaseous products, and this gaseous product material breaks down the adhesive film and thus reduces the mechanical strength of the sand after cooling. Make it less.

The object of the present invention can be achieved by reducing the Hytrol content in the binder to 2.0% by weight. On the other hand, increasing it beyond 4.0 will increase sand shedding. The organic mineral caking according to the invention causes an obvious reduction in the mechanical strength of the sand and the mechanical strength of the sand. Commercially available urea was used as a water-soluble organic additive in the composition of the material. Can be used within a range.

Commercially available urea improves sand by accelerating the rate of crystallization of chemical compounds during the curing reaction. This contributes to increasing the curing rate of the organic mineral binder of the present invention.

The binder according to the invention has a non-negligible effect on the behavior of sand at high temperatures and substantially reduces the work required to knock out (compared to liquid glass sand) - 6 Ru. When the sand is heated to a temperature of 800°C, the amount of carbamide contained in the binder composition is Decomposition occurs. This causes destruction of the original binder film. new harmful products (chemical compounds formed as a result of curing of the binder with the hardener) in the tissue. Because of the uniform distribution, the fully combusted components in the mixture have a uniform volume distribution and thus Helps knock out sand. Organic mineral caking material has a density of 1,440 kg/m has the following properties. Modular x 2-62, p H10-70, surface tension 5 3.0×10 N/m.

1+0.3 to 1.5 weight as a water-soluble organic additive in the composition of organic mineral binder - It is also suitable to use an amount of phenol-formaldehyde resin. This attachment In the presence of additives, the caking material of the present invention can be used at high temperatures (up to 800°C). have important effects on behavior.

The mechanism of action of this additive is as follows. Within the high temperature range of 350℃~500℃ , the phenol-formaldehyde contained in the organic mineral binder composition. Decomposition of the hydride resin occurs, resulting in mechanical damage to the silicate matrix of the binder. Violent emissions of gaseous products occur which reduce the strength. Higher temperature (800℃) The formation of highly conjugated carbon bridges is observed as a result of carbon chain condensation; Materials are very difficult to wet with sodium silicate melt, so they may be wetted first by the released gas. Significantly inhibits the recovery of the originally destroyed silicate film Special Statement 58-501 368'(3) However, the knockout properties of the sand are thus promoted. The binder according to the present invention has a density of 1e 440 kg/m and has the following physicochemical properties. Modulus 2.35, pH 1 0, 7, and surface tension 53. txio-3N/m0 phenol-formalde When the amount of hydride resin is less than 0.3% by weight, the expected effect cannot be obtained; When this resin increases by more than 1.5% by weight, the dissolution of the bulk silicate in water is substantially reduced. is observed to be inhibited.

0.3 to 2 as a water-soluble organic additive to the composition of the organic mineral binder according to the present invention. ．． It is convenient to use an amount of glycerin of 5 parts by weight. The mechanism of action of this additive is The mechanism of action is similar to that of phenol-formaldehyde resin. Use of this additive Therefore, the caking material according to the present invention has a density of 1t440kg/m3 and the following physicochemical properties: have quality. Modulus 2.66, pH 10.7, surface tension 53.6X 1O- 3N/In, reducing the amount of glycerin to less than 0.3% by weight yields the desired results. On the other hand, if the content is increased by more than 2.5% by weight, it will cause increased shedding of sand.

BEST MODE FOR CARRYING OUT THE INVENTION Organo-mineral binders for the production of foundry and core sands include massive silicates, liquid into the mold Contains water-soluble organic additives, and water that decomposes at the temperatures in which iron is cast. present invention The binder contains the above components in the following proportions (weight it%).

Massive silicate 46-54 Water-soluble organic additive 0.3-4.0 water remainder The organic mineral binder contains 2.0 to 4.0% by weight of hight as a water-soluble organic additive. roll, commercially available urea in an amount of 0.3 to 2.0 wt., an amount of 0.3 to 1.5 wt. Phenol-formaldehyde resin or glycerol in an amount of 0.3 to 2.5 wt. May contain serine.

The invention is illustrated by the following examples.

The bulk silicate is dissolved in an aqueous solution of the additive according to the invention under autoclaving conditions. Using an organic mineral binder produced by dissolving in A quantity S) of foundry sand was obtained.

Quartz sand 91.0 Ferrochrome slab 3.5 Organic mineral binder 5.5 That is, Sand No. 1 - 2.0 weight of Hytrol in this organic mineral binder Sand No., 2-3.0 wt%/\Idroll sand No., 3-4.0 wt.-71 Drol sand No. 4-0.3% by weight Commercial urea sand No. 5-1.2% by weight City Commercially available urea sand No. 6-2.0% by weight Commercially available urea sand No. 7-0.3% by weight enoru formaldehyr resin jpNo. 8 0.911 amount of phenol-formaldehyr resin Sand No. 9-1, 5% by weight phenol-formaldehyde resin Sand No. 1Q-o, a weight% glycerin Sand No. 11-1.4 weight-glycerin Phosphorus sand NO.12-2.5 weight-glycerin table 1 10.7-0.80.9-1.20.3-0.40.2-(L40.8-1.0 204-1.00.8-1.20.2-0.40.1-0.30.6-0.83 0.8-1.00.8-1.20.2-0.40.1-0-20.5-0.74 0.7-0.80.9-1.30.3-0.40.3-0.50.8-1250 ．． 7-0.81.1-1.30.2-0.40.2-0.40.6-0.960 ．． 9-1.21.3-1.40.3-0.50.1-0.20.7-0.970 ．． 9-1.21.3-1.60.6-0.70.6-0.70.9-1.380 ．． 9-1.31.5-180.5-0-7 (L4-0.71.2-1.591 ．． 0-1.31.6-2.00.3-0.50.2-0.41.2-1.510 0.8-1.00.8-12 (L6-0.70.2-0.40.7-0.91 10.8-1.00.8-1.20.5-0.70.2-0.40.8-1.0 120.8-1.00.9-1.40.3-0.50.1-0.30.8-1. 0 Table 1 shows the knockout properties of the sands mentioned above (residues of the samples after heating and cooling). (determined by mechanical strength)6 Table 2 Physical-mechanical properties of foundry sand 10.4-0.6 0.5-0.6 0.6-0.8 1.3-1.72 0. 5-0.6 0.5-0.6 0.6-0.85 1.3-1.83 0.6- 0.7 0.6-0.95 0.8-0.95 1.7-1.94 0.4-0. 6 0,7-0.9 1.2-1.4 1.6-1.950.6-0.8 0. 'J-1,31,3-1,61,9-2,060,7-(L9 1.0-1.3 1.4-1.6 1.9-2.07 0.5-0.7 1.0-1.2 1.4 -1.5 1.6-2.08 0.6-0.7 1.2-1.4 1.5-1.6 1.6-2.090.4-0.6 1.0-1.2 1.4-1.6 1.8 -1.910 0.5-0.6 0.8-0.9 1.2-1.4 1.7-1 ．． 811 0.6-0.7 0.8-1.0 1.2-1.4 1.7-1.8 12 0.6-0.7 0.8-1.0 1.2-1.4 1.7-1.8 above From Table 2, it can be seen that all foundry sands containing organic mineral binders according to the present invention were heated to 800°C. It can be seen that heating ensures a significant reduction in the knockout work.

Therefore, the silicates added in the foundry sand and core sand compositions according to the invention are The organic mineral binder used as the basis reliably improves the knockout properties of sand from castings. .

Industrial applicability The organic mineral binding material of the present invention uses carbon dioxide gas, and further contains a thermal desiccant and Most suitable for foundry and core sands hardened using chemical hardeners (liquid or solid). Can be used advantageously.

Table 2 (continued) 1 0.8-0.9 180-210 10-202 0.8-0.9 180 -210 5-153 0.7-0.9 181-212 0-104 0.6 -0.8 172-200 20-405 0.6-0.7 180-210 10-256 0.6-0.7 185-212 0-157 0.6-0.7 180-210 50-608 0.5-0.7 180-210 50-6 09 0.5-0.9 180-210 40-5010 0.8-1.0 1 80-210 40-5011 0.9-1.2 180-210 40-50 12 0.9-1.2 180-210 30-40 International Search Report mls+IIe 嘗人瑠1＾””””””’l’rT! (TlillnM page 401 Continued 〉Initiator: Gelnis Ken Metislav Vinzowitsch Soviet Union 233009 Kaunas Ulitza Parteizas Day 36 -ve 0 9 shots Akira Skomorokhova Berta Nikolaevna Soviet Union 23300 5 Kaunas Ulitza Cyprus Petrausko Day 17 Kavea 17

Claims (1)

[Claims] 1. Bulk silicate, water, and water-soluble organic additives that can be decomposed at the casting temperature of liquid iron. It is characterized by containing these components in the following proportions by weight: Organic mineral binder for the production of foundry sand and core sand. Massive silicate 46-54 Water-soluble organic additive 0.3-4.0 water remainder B: Claim containing 2.0 to 4.0% by weight of Hytrol as a water-soluble organic additive Range of 0.3 to 2.0% by weight of the binder 3 described in item 1 as a water-soluble organic additive. A binder according to claim 1, comprising commercially available urea. 4. 0.2-1.5% by weight of phenol-formalde as a water-soluble organic additive The caking material according to claim 1, which contains a hir resin. 56 Claim containing 0.3-2.5% by weight of glycerin as a water-soluble organic additive The caking agent according to item 1.