DD140348A1 - COMPOSITE - Google Patents

Abstract

The invention relates to a thermal and chemical resistant material made of asbestos and a phenolformaldehyde binder consists. By the invention, the processing and reuse of wastes involved in the manufacture of friction linings, with synthetic, in particular bound with phenol-formaldehyde resins Asbestos incurred. These are burrs from the production, Comminuted and grinding dust, not back in blends can be used for the production of friction linings, since contains those abrasive constituents which are the final product devalue. It has been found that useful, thermally and chemically resistant material with good mechanical Properties can be produced. It basically consists of a mixture of 100 parts by weight Sanding dust or bonded grit, the be bonded with 7 to 25 parts of phenol-formaldehyde resin. Further Material components can be rubber, cement or even Be graphite.

Description

composite material

Field of application of the invention:

The invention relates to a thermally and chemically resistant composite material consisting of asbestos' and a phenol-formaldehyde binder. Las material is particularly suitable for civil engineering and insulation use.

Characteristic of the known technical solutions:

Friction linings, eg for brakes and clutches of vehicles or other machines are usually made of asbestos material at present, the 'suitable synthetic resins by Ge, such as _o phenol-formaldehyde resin is processed into a composite material. Other materials for the production of friction linings are ζ.Β »powdered metals or also plastics combined with thermosets and other suitable additives, such as known fillers and some rubber types.

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In the manufacture of products made of materials with high frictional resistance, the puncture surfaces are ground and the parts provided with holes for fasteners (rivets, etc.). In these mechanical machining operations, sanding dust is produced in a proportion of 10 - 15% of the raw material used. Further waste arises from reject production, burring, etc.

Try to reuse the waste produced in the form of admixtures in fresh mixtures for producing friction linings, · have not met with success because this waste contains grinding wheel grains or grinding wheel shares _y yield the final e-ntwertet. The waste was therefore not processed. This means loss of 'valuable' material and causes further damage due to environmental pollution in the vicinity of deposit points »

Aim of the invention ;

The aim of the invention is to eliminate the above-mentioned deficiency

Explanation of the essence of the invention:

The invention is based on the object that in the production of friction linings accumulating waste material to reuse.

According to the invention the object is achieved by a thermally and chemically resistant material, which consists of 100 parts by weight of grinding dust or asbestos fiber chippings, which are bound with phenohlformaldehyde resin

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and 7 to 25 parts by weight of phenol-formaldehyde binder contains ». ,

The material is heat resistant up to 250 ° and has very good chemical and mechanical resistance values. Due to these properties, the material Z ₀ B. is advantageously suitable for the production of liners for sewer lines and also for V / poor insulation purposes (documents, Platten.u. Of particular advantage is the addition of 20-40 parts by weight of rubber (eg "Butadienstyrolkautsch.uk) together with the usual additives to this material. In the production of decking for sewer lines, the addition of 5 - 8 % cement is advantageous, which does not affect the mechanical properties, but increases the adhesion to the concrete. Further improvement of the material properties can be achieved by blending 5-8 % graphite »

Ausführungabeispiel:

The invention will be explained in more detail below with reference to some examples:

Be itpiel 1

Using a stirrer, a mixture of 82 parts by weight of grinding dust and crumbs, with a grain size of up to 2.5 x 2.5 mm, of a friction material waste and 18 parts by weight of phenol-formaldehyde resin is prepared. The mixture is first pre-pressed in a cold mold and then the Vorpreßlin at 140 - 165 ⁰ C and a JDruck of 300 kp / cm pressed to finished parts.

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Example 2 '"

In a mixing mill, a mixture of the following substances is prepared:

Butadiene styrene rubbers 4500 g

Sanding dust I6915 g

Phenol-formaldehyde resin 1500 g

Oil J 4. · 1500 g

Zinc oxide 180 g

Calcium stearate 90 g

Sulfur 225 g

Accelerator Kaptax 67.5 g

Denax 22.5 g

The mixture is to document plates for ducts pressed ο The pressing erf.olgt in a platen press at from 150 to 300 kgf / cm ² pressure and 120-165 ⁰ C temperature.

The material can be used for components, floor panels, water insulation, thermal and acoustic insulation panels, shock absorbing panels, insulation against chemical influences, roof covering, etc. _e m. be used."

Claims (3)

-s 209 555 Invention Request: High thermal and chemical resistance composite consisting of asbestos and a phenol-formaldehyde binder, characterized in that it consists of 100 parts by weight of grinding dust or asbestos fiber chippings bound with phenol-formaldehyde resin and containing 7-25 parts by weight of a phenol-formaldehyde binder. 2. Composite material according to item 1, characterized in that it contains 100 parts by weight of grinding dust or grit and 20-40 parts by weight of butadiene styrene rubber, 3. Composite material according to item 1, characterized in that it contains 5-8 weight percent Zenent or graphite calculated to the weight of the mixture