DE625022C - Production of road binders - Google Patents

Description

Manufacture of road binders Relative to the bituminous Road binders, such as asphalt, have recently been widely used in place of these Tar products have a significantly lower bond strength. Also, those with tar tend produced road surfaces to soften in hot weather, which is easy to Destruction of the ceilings leads.

It has now been found that coal tar has properties similar to asphalt he = can be divided if one or his high-boiling fractions are in Presence of condensing agents with chlorinated, high molecular weight aliphatic Compounds or substances containing them, in particular lignite or from these Resin or waxy substances obtained by extraction, such as raw montan wax, or residues of oleic and fatty acid distillation, e.g. B. stearic pitch, also chlorinated high-melting paraffuz, etc., to react. Come as a condensing agent the substances customary in the so-called Friedel-Crafts reaction, e.g. B. aluminum or ferric chloride. The condensation is in the heat, expedient at 5o to 2oo °. With the action of the mentioned additives occurs an addition of the high molecular weight aliphatic compounds to the ring-shaped ones Components of the tar, creating a similarity with asphalt in chemical Structure and in its properties is achieved. The chlorine escapes during the reaction in the form of hydrogen chloride gas, making the end product practically chlorine-free.

It is a process to increase the meltability and temperature resistance known from tarry and similar substances that consists in the fact that one mixes from tarry and chlorine-binding substances, such as unsaturated fatty acid esters, e.g. B. linseed oil or rapeseed oil, treated with heat with hexachloroethane. Here, however, only takes place (with the chlorine released from the hexachloroethane) the mixture is chlorinated, but not a conversion and condensation of the tar with the high molecular weight aliphatic compounds, as in the present case. Condensing agents are known in the Process not used, and the masses obtained there come as road binders also not "into consideration.

Example z coal tar is distilled at 2oo ° from the low-boiling components freed. iooo parts of the residue are with ioo Parts of chlorinated, powdery raw brown coal (see below) mixed and at iio -to i2o ° with the addition of 1.2 parts of anhydrous aluminum chloride for one hour long violently stirred. A reaction occurs with the development of hydrogen chloride; and a tough, plastic product of ErvK # calibration point 29.5 ° (measured after Krämer-Sarnow), which can be pulled out in long threads.

The chlorinated brown coal was obtained in such a way that dry Brown coal has been treated with chlorine at normal temperature until - there was an increase in weight of about 20 ° / o.

Example 2 100 parts of the high-boiling-point prepared according to Example i Tars are made with 100 parts; Alene chlorinated raw montan wax with a chlorine content of about 12 per cent fused and - one hour long at iio to i2o ° with the addition of 1.2 parts anhydrous aluminum chloride stirred vigorously. A highly plastic product is obtained with a softening point of 52 °.

Claims (1)

PA> RENTANSPRUCIi .Process for manufacturing .a road binder, characterized in that coal tar or high-boiling tar fractions in Presence of condensing agents, such as aluminum chloride, with chlorinated, high molecular weight aliphatic compounds or substances containing them in the heat,. expedient at temperatures between 5ö and --öo °.