CS236202B1 - Compound for grinding tolls making especially for grinding wheels,segments,stones and files - Google Patents

Abstract

The tools are produced by pressing and then firing or heating the abradant mixture. Before pressing, from 2.5 to 5.5% by weight, based on the weight of the abradant mixture, of a solidifying agent comprising from 80 to 95 parts by weight of sulphite resin and from 5 to 20 parts by weight of an 8 to 15% aqueous solution of an acrylate-type polymer are added to the abradant mixture. This polymer is preferably polyacrylamide. The sulphite resin is preferably prepared at from 80 to 120 DEG C by condensation of from 70 to 95 parts by weight of sulphite waste liquors thickened to a concentration of from 50 to 60%, and from 5 to 30 parts by weight of urea are added thereto.

Description

The invention relates to a tool mill for manufacturing grinding tools, in particular grinding wheels, segments, stones and files.

At present, about 60% of the grinding tools, i.e., the various wheels, segments, stones and files, have been produced by pressing with ceramic binder. However, this binder imparts to them the necessary strength, hardness and texture and even pa-firing. The ceramic binder, which consists of only a small proportion of kaolin or clay alongside various types of frits or other glasses, may have the required strength in the primary production, since it has not been used mx. Ή hmt. %. It is, however, necessary to use a means which provides the necessary grinding tools in the unburned state for the necessary IL. The product used must not contain substances that would be fired. they were decomposing no. used abrasive grain. It must also not have an adverse dermological and biological effect on the nasal smell in order to allow a free working environment in the production halls.

The prior art blends have been formulated to provide the mono-compressive strength of the grinding tools in the dextrinome binder primary production. Dxtrin is in powder form in an amount of, for example, 0.5 wt.% Of a ceramic binder abrasive grain and the granulated mixture is moistened with 2.5 wt. % 50 percent dextrin spacing. . Zlrnšebiní pressure molded bodies 20 MO vylaasiyí after 20 hours ^of drying ^P CC 20 s primer bending strength of 0.8 MPa and ^of considerably brittle. The disadvantage of this production method is the low strength of dextrin, which is the product of starch roasting obtained from potatoes, which are a viable food.

The shortcomings of the prior art compositions for the production of wading tools, in particular paddles, sogmets, stone blocks, and subsequent firing, obviate the invention. The essence of the invention is that la and la contains 94.5 to 97.5%. % abrasive grain and a ceramic binder and 2.5 to 5.5 wt. % of the reinforcing agent, based on the abrasive abrasion, consisting of 80 to 95 wt. parts of a sulfite resin; and 5 to 20 parts by weight of an aqueous 8 to 15% by weight acrylic-type polymer pellet, preferably pelyacrylaid. It is preferred that the reinforcing device is formed by an aulfite resin prepared at a temperature of 80 to 120 ° C by condensing 70 to 95 wt. parts by weight of sulphate liquor concentrated to a concentration of 50 to 60% and 5 to 30 wt. parts of urea.

An advantage of the present invention is that it can instantly increase the strength of the articles when forming. Due to the decrease in the composition of the present invention and to the higher strength of the product, it is also desirable to dry the product. This makes it easier and more convenient to handle and store the semi-products. Another advantage of the invention is that, in some products, it allows drying of the semi-products with normal heats, which also brings energy savings. A further advantage of the composition according to the invention is that it replaces dextrin, reap. the starch from which ae dextrin is made, so that it can be used for food purposes and the like. At the same time, they utilize the sulphite leachate which is lost in the paper industry.

The invention and its effects are explained in more detail in the following examples.

Example 1

To a mixture of 3,500 grams of white corundum grains A 99 l 25 and 480 grams of ceramic beverage No. 02 was added 175 ml of reinforcing agent prepared at 110 ° C by condensation of 90 tactile parts of sulphite leachate concentrated to 55% concentration and 10 wt. parts by weight of urea, to which 15% by weight of an aqueous 10% solution of pelyacrylaid were added for cooling. The sash was thoroughly kneaded and passed through a # 16 screen. The test pieces were pressed at 20 MPa and did not stick to the metal molds. After drying at 20 ° C for 20 hours, the breaking strength of the bodies and the doxtrinome was 0.8 MPa and the bodies of Example 1 were already 1.57 MPa, which is an increase in strength of 96.2% and the bodies of Example 2 already

1.58 MPa and this is an increase. pennoti · 72.5% ·

Example _ ^2236202

To 12500 g of white corundum doe A 99 6. 25 and 480 g of Branik piraeus No. 02 were added »125« 1 hardening agent prepared at 110 ° C by reclamation of 90 parts with the fit of its leachate thickened to a concentration of 55% and 10 wtO. 10 parts by weight of water and 10 parts by weight of polyacrylomide are added. The strain was thoroughly swallowed and suppressed in the No. 16 network. The embossing bodies were poured at 20 MPa and did not stick to the metal ferrule. After drying at 60 ° C for 4 hours, the bending strength of the bodies was determined. with a dextrine of 1.47 MPa and in the bodies of the example. 1. already 2.17 MPa and t »is an increase in pemeoti» 47.6% · '

The sack according to the invention is applicable to the manufacture of grinding tools for grinding abrasive grains and ceramic binders.

Claims (2)

'Ρ δ B D Μ ŽΤ - INVENTION 236 202 1. Snee production of grinding tools, in particular grinding wheels, segments, stones and nails from abrasive srose and patisserie firing consisting of an abrasive screed and a singing agent, zinc tinning containing 94, $ to 97.5% hmo. 2.5 to 5.5 wt.%, based on hmeonest abrasive, of a reinforcing agent consisting of 80 to 95 wt. parts of goblin and 5 to 20 wt. parts of an aqueous 8-15% solution of a polymer of the acirylate type, preferably polyacrylamide. 2 «stoà pocdle point zMauu ^ ^ v ^ i ^Z e zpevnoací means consists oulfitovou pnrskticí prepared at ⁸⁰ and ^Z c koitáeinsací ^{120 E} 70 ^{95 D} I ^profiles are ^L i ^ i ^^ i ^ ^(h ^ with a leachate concentrated to a concentration of 50 to 6 ° C and 5 to 50 wt.