HU200201B - Process for producing mixtures on bitumen base - Google Patents

Abstract

Mechanical, rheologic and thermal properties by bituminous mixes for road surfacing are modified by addn. of macromolecular cpds. namely a ground polymer mixt. in an amt. 2-60, pref. 8-20 wt.% level and cured rubber crumb in an amt. 2-80 wt.%. Chopped copper or aluminium wire strands in an amt. 20 wt.% level may also be added. These may conveniently be chopped cables. The mixt. is heated at 120-160 deg.C to induce flow and applied to road surfaces.

Description

The present invention relates to a process for the preparation of bituminous mixtures, in particular for paving, whose mechanical, rheological and thermal properties are modified by the addition of macromolecular materials.

It is known that there are various requirements for bituminous binders for road structures. These include abrasion resistance, good waterproofing properties, good adhesion, and relatively high compressive strength. The latter requirement, good compressive strength, should be maintained at the widest possible temperature range, under the prevailing ambient temperature conditions.

This means that on the one hand the softening point of the bituminous mixture should be set at the highest temperature and on the other hand the brittleness, thus cracking and breaking of the material should occur at the lower temperature.

To meet these requirements, different efforts are being made to provide higher compressive strength for petroleum-based bitumen over a wider temperature range.

In order to improve the said properties of the bituminous mixture, various fillers and fillers are added.

A 194,641. No. 1st of Asphalt Paving, in particular for the rehabilitation and / or reinforcement of roads and for the preparation of such paving, according to the invention, the filler for solid granular aggregates of various grain sizes is still limestone, fly ash, etc. and stabilizer as sawdust, peat. is recommended.

Another, 198.280. No. 1st, also a Hungarian patent, deals with the preparation of gel-forming masses and powders from clay minerals and organic polymers.

A 231.216. U.S. Patent No. 1st discloses a binder composition made from extraction bitumen. so e.g. propane bitumen and some plasticizer such as tar tar or oil distillate, for road construction, may be prepared.

It is also known in the art that low density polyethylene or atactic polypropylene may be added to the base blend to produce a bituminous mixture having the desired properties mentioned above, while selecting appropriate petroleum fractions.

These macromolecular artificial additives, depending on their concentration, extend the heat resistance interval of the bitumen used for paving so that they can be mixed in many ways to meet the desired technical purpose, but the cost of these products is so high that they can be used economically only for special needs.

It is an object of the present invention to provide a process which broadens the thermal resistance range of a conventional bituminous mixture, while helping to maintain its compressive strength in this range, while solving the problem of waste recovery and environmental protection.

It is an object of the present invention to reuse the so-called cable debris to improve the properties of the bituminous mixture, which would otherwise be difficult to locate, causing dust and dirt pollution.

The inventive idea is based on the discovery of the beneficial effect of these artificial macromolecular materials on improving the heat resistance of bitumen, based on our efforts to recycle the resulting cable waste, knowing the composition of the conventional plastic coating of cables, which includes polyethylene polyvinyl chloride.

It is further recognized that the incorporation of the shredded cable strand into bitumen results in an unexpected significant increase in compression and bending strength in the temperature range of 0-40 ° C, and increases the abrasion resistance of cable and wire splices.

According to its object, the process for producing bituminous mixtures, in particular for road paving, modified by the addition of macromolecular materials for mechanical, theological and thermal lysis, is based on the use of 2-60% by weight of the conventional bituminous mixture, preferably 8-20% by weight. The blend contains 395% by weight of polyvinyl chloride and 2 to 80% by weight of vulcanized rubber, optionally up to 20% by weight of copper and / or aluminum wire, and the resulting mixture is 160 ° C. molten at a temperature between 200 ° C and 200 ° C and then, when applied to the surface to be coated, left to freeze.

A further feature of the process according to the invention may be the use of cable waste as a shredded plastic mixture, the cable waste is comminuted prior to mixing with the bitumen, and during the comminution the cable waste is shredded to the same or different sizes.

The largest particle size is less than 10 mm and the preferred shape of the particle is 1: 1/3: 1/3 in relation to the longest dimension.

The shredded cable waste and / or wire chips are premixed, then the chips are added to the bitumen prepared and preheated mixture with vigorous mixing and the mixture is heated for 1-2 pages while maintaining the mixture.

The process of the present invention provides a dual advantage. On the one hand, we can improve the mechanical and thermal-physical properties of paving bituminous compounds in a very inexpensive and simple way. not found.

The problem is that the cable waste contains polyethylene, polyvinyl chloride vulcanized rubber, and possibly paper and other fibrous materials, as well as significant quantities of copper and aluminum wire lengths of 5 to 10 mm.

While separation is theoretically possible - it involves a series of costly operations, and the combined recycling of waste, due to the different nature of the materials, results in only a low quality end product that can be used in very limited areas.

The process of the invention is illustrated by the following examples:

-2HU 200201 Β

Example 1

100 parts by weight of bitumen are heated to 180 DEG C. with slow stirring, and 10 parts by weight of shredded cable waste containing 50% by weight of polyethylene, 20% by weight of polyvinyl chloride, 25% by weight of rubber and 5% by weight of copper and / or aluminum are added. mixture. The melt was stirred for one hour while maintaining the temperature. After one hour, the melt is poured warm and allowed to cool after finishing.

As a result of the cut cable waste as an additive, the resulting bituminous mixture had a softening point of 5 ° C and a compressive strength (at 20 ° C) of 12%, while its aridification started at 4 ° C lower.

Example 2

All were carried out as in Example 1, except that 35 parts by weight of the waste composition were mixed with 100 parts by weight of bitumen.

The material thus produced had a softening point of 7 ° C and a compressive strength (at 20 ° C) of 15%, while the brittle process started at 6 ° C lower.

Example 3

All were carried out as in Example 1 except that the composition of the plastic waste was 80% by weight of polyethylene, 12% by weight of polyvinyl chloride and 8% by weight of rubber.

In this case, the softening point increased by 8 ° C, the compressive strength (by 20 ° C) increased by 12%, and its rigidity decreased by 8 ° C.

The process according to the invention can be advantageously applied to any surface in a wide temperature range for the preparation of a waterproof, pressure and abrasion resistant coating. It is particularly advantageous for paving pavements and pavements.

Claims (3)

PATIENT INDIVIDUAL POINTS 1. A method for producing bitumen-based mixtures, in particular for paving, the mechanical, theological and the thermophysical characteristics of which are modified by the addition of macromolecular materials, characterized in that the conventional bituminous mixture comprises from 2 to 60% by weight, and preferably from 8 to 20% by weight, of the plastic blend. , the plastic mixture comprises from 3 to 95% by weight of polyethylene and / or other polyolefin, and from 2 to 95% by weight of polyvinyl chloride and from 2 to 80% by weight of vulcanized rubber, optionally up to 20% by weight of copper and / or copper. aluminum wire wafers are also added and the resulting mixture is melted at 160 ° C to 220 ° C and allowed to freeze on the surface to be coated. 2. The method according to claim 1, wherein the cut plastic mixture is a cable waste, the cable waste is shredded before mixing with the bitumen, the scrap is shredded to the same or different size, and the largest dimension of the beads is less than 10 mm. and the preferred shape of the beads is 1: 1/3: 1/3 in proportion to the longest size. Method according to claim 1 or 2, characterized in that the shredded cable waste and / or wire wool is premixed, and then, for the mixture prepared and preheated for bitumen, the seed is added with vigorous stirring, and the mixture is maintained for 1-2 hours with the heat retained. heating