DE3152971T1 - ORGANIC MINERAL BINDING AGENT - Google Patents

Description

BelorussTcy politekfoiietieeky iiistiitiat *. PM 88 417-X-61

w · τ a, _jcm "** * ^# " h " ** April 22, 1983

liinsk / USSB - # C- L / HW

ORGAJlISCdBS idlkiERALBiNDEkUTTSL field of technology

: The present invention relates to the

Foundry and in particular organic mineral binders used in the manufacture of Pormund Kernmasaen are used.

State of the art

The currently known silicate binders do not make it possible to ^{produce molding and core compounds 11} which IG would be able to easily remove from castings

leave. In connection with the more difficult Ausachlag-. .Basxg from ^ö

^w bility of cash on \ silicate binders have, despite their very good sanitary and hygienic properties, an application found only in the production of medium and large castings.

The problem of improving the deflection ability

Such masses are currently being supplied by means of various methods tries; ,. _. _. '

TsttFmr --- ^ - creating by the introduction of various additives into the composition of the particular composition, which are capable under the effect of temperature, either aicti decompose zn the einzugiessenden in the form of metal and changes 4uerschnittε-leading to Spannun ^ aanhSufungen or highly fast end Ürei3toffsysteme to form the melting point of the silicate binding

the, d
soifi ^

; faur

by means of increasing; by introducing organic additives into the water glass, which form eclite solutions with it.

As an example of the implementation of the first of these approaches, a Hasse can be cited for the production of molds and cores which contain the following components in weight > 92.0 "to 9 ^» 2 quartz sand, 4.5 to 5 »5 water glass, 0.9 to 1.1 caustic soda and 0.8 to 1.0 extract phase of the selective refining of oil distillates (SU-PS 627904, class 322G 1/02, published in "Bjulleten Izobreterdya", 1978, Hr. 38) The presence of an extract phase makes it possible to somewhat improve the knock-out properties of the Llasse from castings

however »due to the high gas formation capacity of the Mass, the formation of which is promoted by the extract phase, there is a risk of gas defects occurring in castings, especially in steel & us pieces.

The second, 'Veß to improve the whippability, consisting in the introduction of additives directly into the water glass by means of their mechanical Mixing, has also found widespread use in foundry production. Through the Realization of this process results in a binding agent that gradually increases to its technical level achievable result of the invention to be described comes closest.

A binder, "Uydrosil", is known, consisting of the following components in% by weight · water glass - 80-65 / f >> 1.40-1.52 # / cm ³ ; m = 2.6-2.8 / and double eel of glycose with sodium chloride (ilydrol) 15-20 / SU-PS 172964, cl. 3 22G 1/00, published 1964 /. The binding agent, "Hydrosil", is obtained by mechanical mixing! For 15-30 minutes ^ of Va3 ~ serglas and Hydrolk. The use of "Hydrosil" in the compositions of the Hassen also does not allow the knocking out of cores from castings sufficiently effectively to undertake. That's because Hydro! is not contained in the composition of the micelle of sodium or potassium silicates of the water glass and is not able to effectively destroy the entirety of the layer of the binder at the temperatures that arise in the molds as a result of their full pouring with liquid metal.

Hydrol is also a scarce, - semi-finished product, .was also required, its content in the composition of an organic binder.

Disclosure of the invention

The present invention is based on the object an organic mineral binder for the manufacture

position of molding and core compounds in which the content of components is chosen so that thereby the ability to beat the mass of castings is facilitated.

This task is done through an organic I. ever by! tt el for the production of form and Core masses dissolved, the silicate block, ", Yasser and a water-soluble organic additive

clery
knows who is able to at / temperature of leaving

Ic of the molds with molten cast iron to decompose, and that according to the invention the components mentioned in the following ratio (in% by weight) contains 46 to 54 Silicate block, 0.3 to 4.0 water soluble organic Additive, rest water.

The water soluble organic additive will in the composition of the binder during the Autoclave dissolution of the silicate block in water a temperature in the autoclave of 130 to 240 ° C and a pressure of 0.4 to 0.8 UPa introduced. As a result

? One obtains the application of such a technology a new organic mineral binder that thereby it is characterized in that the organic water-soluble additive is in the composition of the egg cell of ilodium or potassium silicate

pure
is. This requires a specific structure and properties that are only characteristic of this substance. In connection with the fact that the water-soluble organic additive is part of the cell of the silicon of the binder, destruction takes place under the effect of high temperatures with the formation of gaseous products which destroy the entirety of the binder layer and which result from the decomposition of the organic components The resulting coca compounds prevent the layer of binding agent from sintering. All of this determines a significantly greater effectiveness of the use of the organic Lüneral binder in the compositions.

-1 * 5-

p, en of the Torrn and Kernmasaen, which are characterized by an easier impact on castings.

The content of water-soluble organic additive should be in a range of 0.3-4.0% by weight. ^A reduction of this amount below the lower limit does not lead to the achievement of the necessary improvement in the ability to be knocked out of the! Above and beyond the upper limit, the crumbling rises, the grasp.

The content of silicate block should be in a range from 46 to 54% by weight. A reduction in the size of the silicate block below 46 $ does not make it possible to obtain binders with the required density, and an increase in the content ^ over 54% by weight greatly reduces the rate of dissolution of the silica block in water and slows down the process of producing the organic mineral binder.

Hydrol is practical in a I.ienge of 2.0 to 4.0 wt., J as a water-soluble organic additive present in the composition of the organic l ineralbindemittels used ·

The manufacture of the organic inorganic binder takes place in an: a autoclave at the one described above Litigation.

The following describes the mechanism of the behavior of the containers with the organic inorganic binders according to the invention. Im 2usara: .ienhani? So that Hydrol is 15-20'Siges double salt of glycose with sodium chloride and has up to 45-46; ^ heductants and is a component of the egg cell of the sodium silicate, it decomposes under the action of high temperatures (up to 800 ⁰ G) with accruing a substantial one ^ close to gaseous products that destroy the hardened layer of the binder and

-Ύ-6-

thereby the strength of the!.! asse naCTJnA reduce.

. A reduction in the binder Hydrolmenge below 2.0 Gev "& iat inexpedient because that does not lead to achieving the goal identified, and a VergrSsserung this Meugeffiber 4.0 percent;. & ^R $ caused to 2jz% for eigerung the crumbling of! .leave and a certain decrease in their strength.

The produced organic mineral binder with water-soluble organic additive,

Hydrol, has the following properties at a density of 1440 kp / m ³ : modulus - 2.62, pH - 10.75, surface tension - 53.76 · 10 "" - ^} ii / m.

With success of technical urea, in an amount of 0.3 to 2.0 wt S ¹ as a water-soluble organic Zuratzstoff in the composition eng organic i;.! Ineralbindenittels be used.

Technical urea causes an increase in the rate of hardening of the hates with the organic mineral binders according to the invention, this increase is due to the acceleration of the speed the crystallization of the reac

1 ]) g i der

chemical compounds resulting from hardening backWatches.

The binder developed has a significant influence on the behavior of the masses at high temperatures by significantly reducing the work of knocking out the glass compared to Yasser glass masses. When the luasse is heated to 80O ⁰ G, carbamide, which is contained in the composition of the binding agent, is destroyed. This destroys the entirety of the binder layer. A uniform distribution of the new formations (chemical compounds that arise as a result of the hardening of the binder old the hardener) in the structure of the binder leads to a uniform volume distribution of the burned-out components in the

:. '; irae, which makes the. "' aces easier to remove. The organic inineralbinderait has the following properties at a density of 1440 kp / nr · modulus - 2.62; pH - 10.70; surface tension - 53 "O" 1G "* ^Y N / in.

3 with a decrease in the amount of carbanide 0.3 wt.! » the required effect is not achieved, and when increasing its -.! close over 2.0 Gevrv.S in addition, there is a significant development

IC of ammonia in the division of 3imie: nitfcel3.

Zv / eckmnssig also phenol-Foriaaldehyd Hurz can in an amount of 0.3 to I ₁ .5 wt., Einge- "S as a water-soluble organic additive present in the composition of the organic luineralbindemittels

15th is set. The presence of this additive has a significant influence on the behavior of the substances with the developed binder at high temperatures (up to BCO ⁰ C). The \ Yirkungsmechani3mus of this additive is that it takes place a decomposition of the composition of the organic ... ineral-.binueraittels existing phenol ^ ormnldehyd-.Inrzea in the range of elevated temperatures 330-500 ⁰ C, of a ¹ " is accompanied in intensive ¹¹ development of gaseous products that lighten the silicate, based on the 3inieniittel3 and entfestigen. 3EI higher Tenperaturen (up to 800 ⁰ C) as a result of condensation of the carbon chains of the formation of solid verschinOlzene ^ carbon bridges observed that low due to the Wettability of the melt

3C of the atrium silicate essentially prevents the "complete division of the whole of the silicate layer previously destroyed by the resulting jase, which leads to an improvement in the ease of storage of the jase. The binder according to the invention" has the following physical-chemical properties at a density of 1440 kp / nr on · module - 2.35; pH - 10.7; surface tension - 53 »1 · 1θ '"'^> l / m.

• # · * ff

■■ • - / - β-

3EI a |. Ferri delay of Men _f * e of the phenolic resins Por.aaldehyd ^ snunter 0.3 wt ', S, the required effect wixd not reached, and at ^a Vergrösserun ^ this Mengefuber 1.5 wt.' B out. there is a significant slowdown in the dissolution of the silicate block in '.Vasaer.

liit I'Success can as a water-soluble organic Additive in the composition of the organic ineral binding agent glycerine in an amount of 0.3 IC up to 2.5% by weight can be used. Y / irkun ^ aüiechanismus This additive has a similar effect of the phenol-formaldehyde resin in the composition of the binder. This includes according to the invention Binding material has the following physical-chemical properties at a density of 1440 kp / m on i.'odul pil - 10.7; Surface tension - 53.6 * 10 U / irii der Glycerimneng ^^ nter 0.3

a) does not lead to the required result, and r " Pro

^ over 2.5 wt., ^ moreover causes dxe decrease

v> 0 crumbling _f ; the crowd.

3rd variants for the realization the invention

The o _r ^ he _at i _Sc mineral binder for the iierstellung ^before i? Traktorra-j and Kernrnassen contains silicate block, water-soluble organic additives which decompose at the temperature of pouring of the molds with liquid cast iron, and water, Erfindun ^ convention under, the! .!. aterial the components mentioned in the following ratio (in weight); ^ 6 to ^ silicate

3C block, 0 _t 3 to 4.0 water-soluble organic additives, remainder water.

As a water-soluble, organic. Additive, the organic Σ / .ineralbindemit tel either .iydrol in an amount of 2.0 to 4.0 wt% _or% technical urea in an amount of 0.3 to 2.0 3EW .-;. S, or phenol Formaldehyde resin in a length from 0.3 to

15th

? c

30th

3 ^r )

1.5 wt., », Or glycerine in a; .ienp> e of 0.3 2.5 wt. TS included.

The invention is illustrated by the following examples. ■

Under 3in of organic! 'Ineralbinder-n, the result of the autoclave dissolution of a silicate block in aqueous solution of the invention ZuaatTistoffe were made into molding compounds the following composition (in wt / s) produced Quartz sand - 91.0

Ferrochrome slag - 3 * 5

organic i.Iinoral

binder - 5.5 namely;

.Mass λ'Γ. 1 --2.0 wt.% Hydrol in the organic .! uineralbiride.Tiit tel;

: -. iaf »se Hr. ? - 0.3 wt. Ilydrol; l.iafloe Kr. 3-4.0 wt., 5 iiydrol; ;. '. a33e Hr. 4-0.3 wt., Ζ technical urea;

5 - 1.2 3ew.; 5 technical urea;

6 - 2.0 wt% technical grade urea;

7-0.3% by weight of phenol-poraldehyde-oil; 3-0.9 uew. # Phenol-formaldehyde ^ jlars;

..lease lir. 9-1.5% by weight of Fheaol-Pormalclehyd-lIarz; .Mass No., 10 - O ₈ 3 ■ Weight as glycerine? Mass No. 11 - 1.4% by weight of glycerine; Mass lir. 12 -. 2.5% by weight glycerol.

'Table 1

Mass Mt

!.! asae Ur

Mass ilr

Mapse: ir

: «" R.
the Residual compressive strength
on a Teuoeratur 100 ⁰ G 4 CC ⁰ C , UPa, after
from j the warmth; 1OCO ⁰ G !.read
se 2 3 bOG ° C 300 ⁰ C 6th 1 , 7-0.8 0.9-1.2 4th 5 0, d-l, 0 1 0 , 8-1.0 0.8-1.2 0.3-0.4 0.2-0.4 0.6-0,: j 2 0 , 8-1.0 0.8-1.2 O, 2-O _s 4 0.1-0.3 0.5-0.7 3 0 , 7-0.8 0.9-1.3 0.2-0.4 0.1-0.2 0.8-1.2 4th 0 , 7-0.8 1.1-1.3 0.3-0.4 0.3-0.5 0.6-0.9 5 0 0.2-0.4 0.2-0.4

OZ

z 10-

Table 1 (continued)

L. 2 3 4th 5 6th 6th 0.9-1.2 1.3-1.4 0.3-0.5 0.1-0.2 0.7-0.9 7th 0.9-1.2 1.3-1.6 0.6-0.7 0.6-0.7 0.9-1.3 8th 0.9-1.3 1.5-1.3 0.5-0.7 0.4-0.7 1.2-1.5 9 1.0-1.3 1.6-2.0 0.3-0.5 0.2-0.4 1.2-1.5 10 0.3-1.0 0.8-1.2 0.6-0.7 0.2-0.4 0.7-0.9 11th 0.8-1.0 0.8-1.2 0.5-0.7 0.2-0.4 0.8-1.0 12th 0.8-1.0 0.9-1.4 0.3-0.5 1.3-0.3 Ο, β-1.0

Table 1 shows the key figures for the strike bargain (according to the residual pressure resistance of the Test pieces after heating and cooling for the mentioned masses compared.

Table 2 Physico-chemical properties of the masses

Ut. in! .LPa at Aua hurte ?: ei th in hours 24 the
Dimensions 0.5 1 2 5 1 2 3 4th 1.3-1.7 1 0.4-0.6 0.5-0.6 0.6-0.8 1.3-1.8 2 0.5-0.6 0.5-0.6 0.6-0.85 1.7-1.9 3 0.6-0.7 0.6-0.95 0.8-0.95 1.6-1.9 4th 0.4-0.6 0.7-0.9 1.2-1.4 1.9-2.0 5 0.6-0.8 0.9-1.3 1.3-1.6 1.9-2.0 6th 0.7-0.9 1.0-1.3 1.4-1.6 1.6-2.0 7th 0.5-0.7 1.0-1.2 1.4-1.5 1.6-2.0 8th 0.6-0.7 1.2-1.4 1.5-1.6 1.8-1.9 9 0.4-0.6 1.0-1.2 1.4-1.6 1.7-1.8 10 0.5-0.6 0.3-0.9 1.2-1.4 1.7-1.8 11th 0.6-0.7 0.8-1.0 1.2-1.4 1.7-1.8 12th 0.6-0.7 0.8-1.0 1.2-1.4

Table 2 (Continuation)

Crumblability
, 0 Gas permeability
speed
unit Work to the exclusion
gen at 800 ° C, J. 6th 7th 8th 0.8-0.9 180-210 10-20 0.8-0.9 180-210 5-15 0.7-0.9 1dl -2 12 0-10 0.6-0.8 172-200 20-40 0.6-0.7 130-210 10-25 0.6-0.7 1ο5-? 12 0-15 0.6-0.7 130-210 50-60 0.5-0.7 180-210 50-60 0.5-0.9 180-210 40-50 0.8-1.0 100-210 40-50 0.9-1.2 iao-210 40-50 0.9-1.2 180-210 30-40

Au3 fler Table 2 it can be seen that all funds with the erfindunr> 3 ^ e: wet organic Llineralbindemittel rwärznung a substantial shortening of the work for knocking in "the .lasse to ensure to 800 ⁰ C.

In this way, the invention assures organic iiineral binders on a silica sheet, which are in the compositions of the molding or core materials introduced the achievement of an improved deflection that take hold of cast pieces.

Industrial application

The organic mineral detergent can be particularly successful are used in molding and core materials, both with carbon dioxide gas and with the help of '"arm drying and chemical hardening agents (liquid or solid).

Claims (5)

PM 88 Μ7-Χ-61 'April 22, 1983 PATSHTAiiSraUCilE / ■ «· 1. Organic mineral binder for manufacturing of molding and core compounds, the <silicate block, Water and water-soluble organic additives, ■ 5 those at the temperature of the pouring of the respective ? orm cannot decompose with cast iron, characterized in that it has the components mentioned in the following ratio (in weight 56): Silicate block 46-54 water soluble organic Additives 0.3-4.0 '"aaser rest. 2. Organic ..liner binder according to claim 1, characterized in that das3 ea as a water-soluble, organic. Zucat?: Stof f hydrol in an amount of 2.0-4.0 wt. j. 3. Organic mineral binder according to claim 1, characterized in that it is water-soluble, or ^ aniachen. Additive technical Urea in an amount of 0.3-2.0 Gev /./ i. 4. Organic mineral binder according to claim 1, characterized in that it is water-soluble, organic. Phenolic additive -iOraialdehyd-IIarz in an amount of 0.3-1.5 wt.> i. 5. Organic liner binder according to claim 1, characterized in that it as a water-soluble, organic additive glycerine in an amount of 0.3-2.5 wt.