DE19539218A1 - Rubber compsn. for prodn. of sanding and polishing discs - Google Patents

Abstract

A rubber mixt. for prodn. of sanding and polishing discs comprises 10-40 (13-25) wt.% natural or synthetic rubber, 90-50 (85-65) wt.% abrasive grains and 0-10 (2-10) wt.% additives, esp. reinforcing resin.

Description

The invention relates to a rubber mixture for the production of grinding and polishing wheels.

Manufacturing processes for shaping materials cause as undesirable machining result burrs. These material accumulations are above the Target geometry of the workpiece and are located on its edges or surfaces. The The quality of the surface is of crucial importance for the quality of the Workpiece. The polishing process is just as important as the grinding process.

Abrasives are known which are obtained by mixing abrasive grain with a binder which is a meltable synthetic resin powder by hardening the binder getting produced. The disadvantage of this grinding wheel is that it is not sufficient elastic behavior in the application and poor oil resistance. In most cases, the cooling lubricants used in grinding contain oils or oil-like substances in dispersed form.

In contrast, the rubber mixture according to the invention shows in a composition according to Characteristics of claim 1, in particular according to the characteristics of claim 2 elastic behavior and the required oil resistance. The areas of application are primarily Because of their elasticity, wherever you can use conventional grinding wheels Resin base difficult to get to accessible workpiece shapes.

The elastic grinding and polishing discs based on the have the following advantages composition according to the invention on:

• - particularly cuddly
• - finest surface in shortest processing time;
• - Oil resistance to cooling lubricants;
• - good grain adhesion;
• - long service life;
• - low abrasion.

All types of abrasive grain, in particular quartz, corundum or carbide, in particular silicon carbides are used. Depending on the application Abrasives are the use of abrasive grains in the grain size F 8 to F 1200 (according to FEPA- Standard), in particular from F 60 to F 360. With the use of a reinforcing resin are combined with the actual reinforcement, the abrasive grain or Abrasive grain adduct, advantageous degrees of hardness achieved. The reinforcing resin, for example on the The base of phenol or a substituted phenol is used in parallel to the sulfur vulcanization networked. Furthermore, the miscibility and dispersibility of the abrasive grain or of the abrasive grain adduct in the polymer matrix in the presence of a reinforcing resin essential improved.

An abrasive grain adduct, in particular a silicon carbide adduct, is expediently used used, which contains an activator, in particular a silane. In this way, the Grain adhesion to the rubber can be improved. The degree of loading of the activator or Silanes is advantageously 2 to 25 wt .-%, based on that Abrasive grain adduct.

An exemplary formulation of the rubber mixture is shown below:

Perbunan N 3807 (a) 16.00% by weight
VulkacitTMTD 95 PA (b) 0.25% by weight
Grinding sulfur S 100 (c) 0.25% by weight
Stearic acid (d) 0.40% by weight
Allovol PH 812 (e) reinforcing resin 3.10% by weight
Abrasive grain adduct (f) 80.00% by weight

• a) Bayer AG
• b) tetramethylthiuram disulfide accelerator from Bayer AG
• c) Kali-Chemie AG (Hanover)
• d) Unichema priest
• e) Hoechst AG
• g) adduct of silicon carbide F 120 (macrograin according to DIN 69101, part 1) of Lonza Werke GmbH and made of silane 264 from L′Güssa (Antwerp).

The vulcanization conditions in the manufacture of the grinding and polishing wheels are usually 50 minutes at 150 ° C. The pressure is about 200 bar.

Claims (6)

1. Rubber mixture for the production of grinding and polishing discs, characterized by the following composition:
Natural and / or synthetic rubber 10 to 40% by weight
Abrasive grain or abrasive grain adduct 90 to 50% by weight
Additives, in particular reinforcement resin 0 to 10% by weight 2. Rubber mixture according to claim 1, characterized by the following composition:
Natural and / or synthetic rubber 13 to 25% by weight
Abrasive grain or abrasive grain adduct 85 to 65% by weight
Additives, in particular reinforcement resin 2 to 10% by weight 3. Rubber mixture according to claim 1 or 2, characterized in that as Types of abrasive grain Corundum, quartz or carbide, especially silicon carbide, Find use. 4. Rubber mixture according to one of claims 1 to 3, characterized in that the Abrasive grain a grain size from F 8 to F 1200, in particular from F 60 to F 360, having. 5. Rubber mixture according to one of claims 1 to 4, characterized in that the Abrasive grain adduct, in particular silicon carbide adduct, an activator, in particular a Silane. 6. Rubber mixture according to claim 5, characterized in that the degree of loading of the activator or silane is 2 to 25 wt .-%, based on that Abrasive grain adduct.