DE3742572A1 - Drilling and cutting medium for rock - Google Patents

Abstract

Use of a liquid or paste-like preparation as a drilling and cutting medium, especially for working iron-reinforced concrete by means of diamond-tipped drilling and cutting tools. The preparation consists of a liquid base (carrier) from the group comprising water and/or mineral or synthetic lubricant and a finely particulate, inorganic solid and further processing aids such as emulsifiers, thickeners and the like.

Description

The invention relates to the use of a flowable Preparation as a drilling and cutting agent for rock, a finally masonry.

In particular, for renovation and conversion purposes must be standing structures very often retrofitting openings or breakthroughs are attached. The materials of this Buildings whose creation very often already years or years tenth ago, often have very high strength and hardness values. Accordingly high is the Ver Wear of the drilling and cutting tools. A bad one Condition of drilling and cutting tools only allows a lot small feed values and thus results in very long machining processing times. In practice, it is the rock processing tion, for example by means of diamond-tipped tools usual to supply water to the processing station. This Water has different tasks. On the one hand, the water should cool the tool and protect it against overheating. On the other hand, with the water in the processing accumulating rock flour be removed. Finally will prevented by the water and dust formation. in particular especially in the processing of iron reinforcements aufwei sendem concrete has been shown to be feeding water not enough and thereby the wear of the tools very much is high.

The invention is based on the object, the rock bar so that less wear of the Tool and higher feed values are possible.

According to the invention, this is achieved by using a flüs or pasty preparation reaches a salary from 10 to 85% by weight of finely divided, inorganic solid and 90 to 15% by weight of a liquid carrier from the group Water and / or mineral or synthetic lubricants  average based on the total mass of solid and carrier having. Preferably, the solids content lies between 30 and 75% by weight; the content of liquid carrier between 70 and 25 wt .-%.

The mode of action of the preparations used according to the invention tion is not yet fully understood. Anyway, it was one Significant increase in service life of the tool and the drill feed observed. The content of a finely divided, inorganic solid in the preparation results in the Editing possibly an embedding of the cutting and thus leads to less wear of the cutting. In the Machining of iron reinforcements containing concrete forms the solid between the individual, during processing resulting iron shavings a separation layer, which a Ver Welding the chips prevented each other. The liquid Carrier serves apart from the cooling on the one hand the binding the solids and on the other hand allows a good Zubrin supply of solids to the processing point. Depending on the user The preparation may be modified by different conditions a rather liquid or pasty consistency respectively. While drilling for supply reasons a rather liquid preparation is appropriate, can during Sawing due to the relatively simple feed a pasty Preparation can be used. Such a paste-like Zube preparation can be made by sawing one out of a dosing device kicking strand virtually lossless to the editing be supplied.

The solid should during processing the resulting chips surrounded and a direct contact of the chips with the work avoid as much as possible. To get an extra the wear of the tool through the solid avoid, it is expedient that the solid has a hardness to Mohs of 5 or less, preferably between 1 and 4 has. The hardness of the reinforcing egg contained in the concrete is about 6 to 7, which is well above that those of the solids. Due to the lower hardness of the hard  materials against the material to be cut will also be the Wear of the tool less than without the use a preparation with inorganic solids.

The solid advantageously has an average grain size up to 20 microns, preferably 1 to 5 microns on. A grain size of the solid lying in this order of magnitude fabric allows a good, even distribution of Solids in the preparation and a simple feed the preparation to the processing point.

Especially when using a liquid preparation the solids should not be too big, already around one To prevent clogging of feed channels. It is therefore appropriate that the solid has a maximum grain size up to 75 microns, preferably up to 10 microns. 99% of the solid to the passage of 75 microns he rich.

For the binding of the solid, it is expedient that the carrier mineral - or paraffin oil contains. Mineral or paraffin oil is usually relatively sticky and allows a good adhesion of the preparation of the cutting of the tool or to the processing of armor iron anfal looming chips.

Another advantageous solution is that the Carrier polypropylene glycol as an example of a synthetic Contains lubricant.

For the processing of the preparation, it is advantageous that therein up to 10 wt .-% in particular 2 to 6 wt .-% be attracted to the total mass waxes are included. As waxes may be natural waxes or hydrocarbon waxes, at For example, paraffins with a melting point between 45 ° and 120 ° C are used.  

It is for binding water contained in the preparation appropriate that the preparation fumed silica, in particular up to 8% by weight, preferably 2 to 4% by weight based on the total mass.

To get good adhesion on the metal surface, it is advantageous that in the preparation of metal soap, in particular up to 6% by weight, preferably 1 to 3% by weight is contained based on the total mass. Such metal soaps, ie salts of higher fatty acids can e.g. Stearate, Palmitate, Oleate, Laureate of Lithium, Aluminum, Barium, Calcium, magnesium or zinc. Particularly suitable Calcium stearate and zinc stearate.

In order to avoid a useless flow of the preparation, It is expedient that thickening agent, preferably in an amount of 1 to 10 wt .-% based on the total mass is included. As a thickener, for example fumed silica, possibly also hydrophobic, poly ethylene glycol, ethylene oxide or propylene oxide copolymeri sate, polyvinyl alcohol, methylcellulose, carboxymethylcellu loose sodium salt or starch.

The essentially of a solid and a liquid Carrier existing preparation should also after some rest period have a uniform distribution of the components. It is therefore advantageous that an emulsifier, in particular to to 4 wt .-%, preferably 0.1 to 0.5 wt .-% based on the Total mass is included. Suitable are anionic, katio niche, as well as nonionic emulsifiers, the emulsions of Stabilize type "oil in water", e.g. Salts of higher fatty acids with sodium, potassium, ammonia or amines, alkali metal salts of Sulfuric acid half esters of higher fatty alcohols (e.g. Lauryl sulfate) alkylarylsulfonates, fatty acid amides, partial Esters of polyhydric alcohols, e.g. Glycerol monostearate or oleate, alkylphenol alkoxylates or fatty acid or fatty alcohol alkoxylates.  

A convenient preparation is that the carrier From 5 to 35% by weight of paraffin oil and from 95 to 65% by weight of water contained in the total mass of liquid carrier. The Water and the paraffin oil form an emulsion in which the solid is distributed.

An advantageous preparation is that the party fabric is chalk or contains. Chalk (i.e., calcium carbonate or calcite) has a Mohs hardness of about 3 and is thus much softer than the reinforcement to be cut iron with a Mohs hardness of about 6. Cretaceous is beyond very cheap, non-toxic and easily available. Next However, chalk can also be dolomite, kaolin, barite, gypsum, Alumina hydrates, zinc oxide, magnesium oxide or calcium hy be used.

Another expedient preparation is that the solid is talc or contains. Talc is very soft and by definition has a Mohs hardness of 1. Talc is also non-toxic, relatively readily available and inexpensive.

For the supply of the preparation, in particular during drilling, it is advantageous that the preparation is an aqueous Emul sion is. Such an aqueous emulsion can be known in the art Way promoted by a pump to the processing station become. To save on transport and storage costs can the preparation of the invention prepared as a concentrate and by the user before use by adding liquid in particular from 2 to 10 parts of water to the ge desired concentration to be diluted.

Thus, preparations with carrier levels of less as 15 wt .-% based on the total mass of solid and Carriers are brought into the trade, which then before the Use additional carrier shares for setting the ge desired viscosity be added. As another, zu placing carrier is usually water, and in special cases  the carrier content up to more than 90 wt .-%, based on the Total mass of solid and carrier can be increased. This is particularly the case when the preparation by means of a metering device is added to the cooling water flow.

Particularly useful is the use of the preparation for Cutting and / or drilling concrete, in particular iron reinforced concrete, in particular with diamond drill and cutting tools. Diamond drilling and cutting tools are very expensive and must be as good as possible with good degradation performance can be used for a long time. Diamond drilling and cutting unit Witnesses have synthetically produced diamonds, which embedded in a matrix. By using the preparation according to the invention is a premature removal the matrix and thus too much exposing the diamonds prevented. By the protruding from the matrix part of Diamonds surrounding preparation are encountered when hitting the Damping diamonds on reinforcing bars resulting in shocks and a splintering of diamonds largely prevented.

For processing, which is the supply of a pasty Allow preparation, for example when milling or Sawing, the preparation can be about the consistency of a having the term "plasticine" known plasticine. Such a mass has the following, for example on:

example 1 Paraffin oil viscous DAB8 12.5% by weight Chalk, 72.5% by weight (average particle size 1 μm) @ zinc oxide 10% by weight Paraffin (mp 46-48 ° C) 5% by weight

Example 2 Paraffin oil viscous DAB8 29.3% by weight talc 68% by weight (average particle size 15 μm) @ zinc stearate 2.7 parts by weight

A water dilutable concentrate, the one particular forms usable for drilling, has for example, the following composition:

Example 3 Paraffin oil viscous DAB8 9.2% by weight chalk 40.3% by weight (average particle size 1 μm) @ fumed silica 3% by weight alkyl phenol 0.1% by weight water 47.4% by weight

Example 4 Paraffin oil viscous DAB8 8.9% by weight talc 41.5% by weight (average particle size 15 μm) @ zinc stearate 0.9% by weight fumed silica 2.9% by weight alkyl phenol 0.1% by weight water 45.7% by weight

The preparations mentioned gave in Bohrversuchen means Diamond drilling tools on steel plates up to 100 times ge reduced wear of the drilling tool and enabled up to at twice the maximum feed rate Drilling experiments in which the drilling tool only water supplied was led.

Claims (17)

1. Use of a liquid or pasty preparation containing
10-85 wt .-% finely divided, inorganic solid and
90-15 wt .-% of a liquid carrier from the group of water and / or mineral or synthetic lubricant
as a drilling and cutting agent for rocks, including masonry. 2. Preparation according to claim 1, characterized by a Content of 30-75% by weight of solid and 70-25% by weight liquid carrier. 3. Preparation according to claim 1 or 2, characterized marked characterized in that the solid has a Mohs hardness of 5 or smaller, preferably between 1 and 4.   4. Preparation according to claim 2 or 3, characterized marked records that the solid has a mean grain size up to 20 microns, preferably 1 to 5 microns. 5. Preparation according to one of claims 2 to 4, characterized characterized in that the solid has a maximum grain size up to 75 microns, preferably up to 10 microns having. 6. Preparation according to one of claims 2 to 5, characterized characterized in that the carrier is mineral or paraffin contains oil. 7. Preparation according to one of claims 2 to 6, characterized characterized in that the carrier is polypropylene glycol ent holds. 8. Preparation according to one of claims 2 to 7, characterized characterized in that waxes up to 10 wt .-%, in particular from 2 to 6 wt .-% based on the total mass ent th are. 9. Preparation according to one of claims 2 to 8, characterized characterized in that fumed silica, in particular up to 8 wt .-%, preferably 2 to 4 wt .-% based is contained on the total mass. 10. Preparation according to one of claims 2 to 9, characterized characterized in that metal soap, in particular up to 6 wt .-%, preferably 1 to 3 wt .-% based on the Total mass is included. 11. Preparation according to one of claims 2 to 10, characterized characterized in that thickening agent, preferably in an amount of 1 to 10 wt .-% based on the Ge velvet mass is included.   12. Preparation according to one of claims 2 to 11, characterized characterized in that an emulsifier, in particular up to 4 wt .-%, preferably 0.1 to 0.5 wt .-% based on the total mass is included. 13. Preparation according to one of claims 2 to 12, characterized in that the carrier contains 5 to 35% by weight of paraffin oil and 95 to 65 wt .-% water based on the total Contains mass of liquid carrier. 14. Preparation according to one of claims 2 to 13, characterized characterized in that the solid is chalk or ent holds. 15. Preparation according to one of claims 2 to 14, characterized characterized in that the solid is talc or ent holds. 16. Preparation according to one of claims 2 to 15, characterized characterized in that it is an aqueous emulsion. 17. Use of a preparation according to one of claims 1 up to 16 for cutting and / or drilling concrete, in particular special of iron reinforcements having concrete, esp especially with diamond drilling and cutting tools.