CS218692B1 - Thawing bodies, especially thawing granules of asphalt mix - Google Patents

Abstract

The invention relates to de-icing bodies, in particular de-icing granules of asphalt mixture for road treatment, formed by a core containing calcium chloride and optionally sodium chloride and sodium hydroxide, which is placed in a hydrophobic coating. The invention consists in the hydrophobic coating containing 0.4 to 5% by weight of zinc stearate and 0.1 to 3% by weight of zinc sulfate and 0.01 to 0.1% by weight of octadecylamine, based on the total weight of the de-icing bodies. The coating of the de-icing bodies further contains 0.1 to 2% by weight of inorganic peroxide or organic peroxide, based on the weight of the de-icing bodies.

Description

The invention relates to defrosting bodies, in particular to defrosting granules of an asphalt mixture for the treatment of pavements.

The essence of the prior art deicing compositions for winter roadway treatment is based on the formation of eutectic mixtures from water and well soluble salt on the roadway. In most cases, alkali metal or alkaline earth chlorides such as sodium chloride or calcium chloride are used for this purpose. Chlorides contained in the melting slurry on the road cause considerable corrosion problems! impact, both on passing vehicles and on metal parts of road equipment. This problem is solved by a number of processes according to which chloride deicing agents are additive with corrosion inhibitors which substantially reduce the corrosion attack of metallic materials. However, the abundant use of these deicing agents results in a strong increase in the concentration of chloride, sodium or calcium ions in the soil, which in turn; leads to a deterioration in the biosphere state around the road. This problem is currently partially solved by the use of non-chloride deicing agents mainly based on urea or mono- or polyhydric alcohols. The disadvantage of this method of winter treatment of roads is mainly a considerable consumption of expensive chemicals. However, a major drawback of the above procedures is the laboriousness of frequent road spreading in winter. The spreading material, required in considerable quantities, presents considerable storage and transport difficulties. The correct dosing of the defrosting agent is not observed during individual scattering, which reduces the resulting effect and economy of the whole process. In winter, there are often sudden weather changes that lead to calamitous situations due to the low operability of chemical and other scattering.

These deficiencies are removed by MS. AO 182 814, which protects a mixture consisting of a base material comprising in particular asphalt and additives of melting agents. The melting additive consists of particles the core of which is calcium chloride and sodium hydroxide, and the watertight containers of drying oils or plastics, which are mechanically degradable. The mixture contains no anticorrosive additives.

This serious drawback is overcome by the invention according to which the deicing elements, in particular the deicing granules of the asphalt mixture for. a pavement comprising a core comprising calcium chloride and optionally sodium chloride and sodium hydroxide, which is embedded in a hydrophobic casing, wherein the hydrophobic casing comprises 0.4 to 5 wt. % zinc stearate and 0.1 to 3 wt. % zinc sulfate and 0.01 to 0.1 wt. octadecylamine based on the total weight of the thawing bodies.

The defroster casing further comprises 0.1 to 2 wt. inorganic peroxide or organic peroxide based on the weight of the thawing bodies.

The solution according to the invention has the advantage, first of all, that the defrosting granules with an average size of 8 mm are coated during manufacture with a coating of hydrophobic zinc stearate with an inhibitory effect. They also contain other corrosion inhibitors of metallic materials which both increase the inhibitory effect and at the same time improve the quality of the bituminous coating. The long-term effect of the asphalt mixture with the deicing granules consists in the gradual abrasion of the surface of the tires of passing vehicles and thus in the renewal of the de-icing ability of the additive components of the asphalt mixture. The zinc stearate forming the coating on the calcium chloride and sodium hydroxide granules has the task of both reducing the solubility of the substances depending on the traffic density and acting on the metallic materials coming into contact with the slurry on the road. The inhibitory effect of the preparation is enhanced by the content of zinc sulfate in the granules. The thawing granules further contain organic or inorganic peroxy compounds, which enhance the quality of the asphalt mixture and by the subsequent reaction products increase the inhibitory effect of zinc sulfate and stearate.

Asphalt pavement composition with a long-term deicing and anti-corrosion effect usually contains 3 to 6% by weight. defrosting granules and laid on the road in a thickness of 3 to 4 cm. With average traffic on the road, a 3 to 4 year service life can be expected when removing an additive asphalt carpet of about 0.8 cm per year. During this time, the defrosting and anticorrosion properties of the asphalt mixture according to the invention will be constantly restored.

The use of the deicing bodies according to the invention for the treatment of pavements will not cause icing or icing on the pavement in winter and the corrosion rate of the metallic materials of the vehicles will be substantially reduced. Another advantage lies in a one-time modification, saving technology and operating personnel. An important benefit of the thawing bodies according to the invention is the ecological safety compared to the prior art processes.

Defrosting bodies resp. the deicing granules of the asphalt mixture of the invention need to be applied in dry weather.

The invention is illustrated by the following examples of specific use.

Example 1

For the production of asphalt mixture for the treatment of pavements with long - term defrosting and

Β

The asphalt mixture contained 5 wt.

defrosting granules of composition:

Běžné common bituminous mixture and 5 wt. defrost granules of the following composition:

89.9 wt. % calcium chloride wt. sodium hydroxide

0.7 wt. % of zinc sulphate, which were coated in the production by weight wt. zinc stearate

0.3 wt. cumene hydroperoxide

0.1 wt. octadecylamine.

The temperature of the asphalt mixture for additivation by thawing granules did not exceed 180 ° C.

Example 2

3.9

0.1

0.7

0.2

0.1 wt. % of calcium chloride. % zinc stearate wt. % octadecylamine wt. % zinc sulphate % cumene hydroperoxide wt. zinc persulfate.

The mixture showed good deicing effects.

Claims (3)

Defrosting bodies, in particular deicing granules of an asphalt pavement composition, comprising a core comprising calcium chloride and optionally sodium chloride and sodium hydroxide, which is contained in a hydrophobic coating, characterized in that the hydrophobic coating contains 0.4 to 5% by weight. % zinc stearate, 0.1 to 3 wt. % zinc sulfate, 0.01 to 0.1 wt. octadecylamine, based on the total weight of the thawing bodies. VYNALEZU 2. Defrosting bodies according to claim 1, characterized in that their packaging further comprises 0.1 to 2% by weight. organic peroxide based on the weight of the defrosting bodies. 3. The thawing bodies according to claim 1, further comprising 0.1 to 2 wt. % of inorganic peroxide based on the weight of thawing bodies.