CS267051B1 - Preparation of modified asphaltic compounds - Google Patents

Abstract

The solution concerns waterproofing industries gasket joints for transport structures and the like details of other engineering structures. It solves the way of preparation of modified asphalt higher quality and functional blends parameters. The essence of the solution is that the present ether, e.g. synthetic rubber SBR and atactic polypropylene are added into molten asphalt dissolved in organic solvent, which makes it more perfect homogenization and dispersing of these substances in asphalt and making it more stable dispersion system, while increasing qualitative parameters, resp. chemicophysical properties of the mixture. Solutions by solution can also be used in other fields construction production, e.g. for parquet gluing, glass and textile fabrics; glass wool and basalt and bottled parts from plastic masses, phenol formaldehyde resins and the like.

Description

The invention relates to a process for the preparation of asphalt modified mixtures, for the purposes of insulation, waterproofing and for use also for grouting joints and gluing building components. ,

In technical practice, it is known to use plastic or elastic substances to increase the quality and functional parameters of asphalt bitumens. These substances, to a greater or lesser extent, lend bitumens some of their properties, which cause the improvement of their physico-chemical properties and thus help their wider application in practice. By using plastics such as polyethylene, polypropylene, etc. the tack and resistance of bitumens increases at higher operating temperatures (up to 80 ° C), on the contrary the use of elastomers such as synthetic rubbers of the butyrene type styrene SBR increases the resistance, ductility and flexibility of bitumens at lower temperatures (up to -25 ° C).

A particular problem in this area is the use of various types of waste from petrochemical production, including very little used atactic polypropylene-PPa. The use of PPA for the purpose of modification of asphalt bitumens is generally known. dispersibility in asphalt bitumens. The methods used so far to use PPA for this purpose have not yielded satisfactory results, mainly due to the choice of inappropriate technological procedures for self-modification.

To date, several methods for adding PPa to asphalt bitumens are known. First of all, it is the direct addition of PPa to molten bitumens. The mixtures prepared in this way are characterized by only a slight increase in some properties (soaking point), but on the other hand by several negative properties, such as insufficient homogeneity, reduction of ductility, increase of penetration and the like. ·

Another way to achieve relatively better dispersibility! PPa in molten bitumen is a method of adding PPa in the form of an oil concentrate (melt oil - PPa). In this way, the processability and dispersibility of PPa is increased, but on the other hand only a small increase in quality parameters with more negative properties of the mixture is achieved, which is due to the presence of an increased amount of light aromas. The resulting mixtures are phased out after cooling, mainly by using a higher percentage of oil concentrate, the oil present rising to the surface of the bitumens at higher operating temperatures and acting there as a separator.

It eliminates the mentioned shortcomings, resp. A process for the preparation of modified asphalt mixtures containing synthetic rubber and atactic polypropylene according to the invention has a higher effect, characterized in that both polymers are added to molten asphalt at a temperature of 80 to 130 ° C in the form of a solution in an aromatic, aliphatic or halogenic organic solvent. up to 20 parts by weight of synthetic rubber, 1 to 20 parts by weight of atactic polypropylene and 60 to 98 parts by weight of an organic solvent which is evaporated at a temperature of up to 200 ° C in a further homogenization process.

The essence of the invention is that the synthetic rubber and the atactic polypropylene are dissolved in an organic solvent and thus treated are added to the molten asphalt or asphalt mixtures. This procedure ensures higher dispersibility of synthetic rubber and atactic polypropylene in asphalt bitumen, further homogeneity of the resulting mixture and better connection of said substances to asphalt bitumen molecules and thus creates a more stable dispersion system, while its properties are given by the interaction of synthetic elastomer and plastic. The advantage of this method is also that the solvent by means of which the dispersion of the polymers in the asphalt bitumens is achieved is inert to the mixture, i. that it does not adversely affect the properties of the final product. This is evaporated in the modification process and collected in an exchanger and, after purification, used to prepare another solution. The modification process is carried out in a closed and sealed system, which also ensures hygiene and safety at work. Another advantage of this method is that it uses little used waste in industries where it saves both asphalt and some Salter components of the material, such as synthetic rubber, while energy inputs to the technological process are lower,

CS 267 051 Bl as with other methods. The final product of this process, or after its treatment with fillers and other additives, achieves higher quality parameters than materials prepared by other processes or using only PPa alone, respectively. synthetic rubber.

Masses prepared in this way achieve the following parameters: pour point KG to

100 ° C, breaking point up to -25 ° C, ductility 20 to 60 cm, penetration 50 to 100 penetration units and ductility at -10 ° C up to 200%.

Example 1

SBR synthetic rubber blocks and cuttings, resp. the atactic polypropylene PPa granules are calendered together, stretched over a twin roll on a 2 to 3 mm thick film. The thus prepared are metered into a homogenizer, where the organic solvent and the heat stabilizer are metered in for two stages. The mixture is homogenized until complete dispersion, resp. dissolution of polymers.

Substance and mass composition of the solution:

synthetic rubber SBR 5.0 parts by weight atactic polypropylene 2.0 wt., Parts heat stabilizer 0.5 wt., Parts trichlorethylene 92.5 wt., Parts

Example 2

Procedure for the preparation of a solution as in Example 1, having the following composition and mass composition:

synthetic rubber SBS 15.0 mass parts atactic polypropylene 10.0 mass parts heat stabilizer 1.0 mass parts technical gasoline 74.0 mass parts

Example 3

Procedure for the preparation of a solution as in Example 1, having the following composition and mass composition:

synthetic rubber SBR 7.0 wt. parts atactic polypropylene 4.0 wt. parts heat stabilizer 0.5 wt. parts toluene 86.5 wt. parts

Example 4

The modified solution according to Example 1 is metered into the molten asphalt AOSI 75/30 or 85/25, 40 at a temperature of 100 to 120 ° C with constant stirring. 180 ° C. The resulting asphalt modified mixture is of the following material and weight composition:

asphalt AOSI 75/30, 85/25 92.5 wt., parts synthetic rubber SBR 5.0 wt., parts atactic polypropylene 2.0 wt., parts heat stabilizer 0.5 wt., parts

CS 267 051 Bl

Said mixture reaches these parameter point mKk KG KG 90 to 110 ° C, breaking point up to -22 ° C, penetration 40 to 60 penetrators. units.

The material prepared in this way is intended for the production of insulating coatings for various engineering and technical constructions, such as bridge decks, swimming pools, roof insulation, etc.

Example 5

Graded vulcanized rubber of fraction 0 to 1.5 mm, fly ash fraction up to 0.5 mm is added to the molten honor asphalt AP 65 at a temperature of 80 to 120 ° C with constant stirring and mixed thoroughly with it for 30 minutes. The modification solution prepared according to Example 1 is added to the mixture thus prepared with constant stirring and is completely dispersed in the mixture for 45 minutes. In the next phase, the mixture is homogenized and the solvent present is evaporated until it is completely evaporated at a temperature of up to 180 ° C.

honor asphalt AP 65 80.0 wt., parts rubber sorted 8.7 wt., parts fly ash 0.3 wt., parts synthetic rubber SBR 7.0 wt., parts atactic polypropylene 4.0 wt., parts

Said mixture reaches these parameters a softening point of KG up to 80 ° C, a breaking point of up to -18 ° C, a penetration of 50 to 70 penetrators. units.

The materials prepared in this way are suitable for gluing foils made of plastics, textile and glass fabrics, parts made of porous, resp. of polished materials as well as a harder type of grout, intended for sealing joints up to a thickness of 12 mm.

Example 6

The modified solution according to Example 3 is metered into the molten asphalt A 80 at a temperature of up to 120 ° C with constant stirring. so that the dry matter content of the solution is 30 to 60% by weight. The resulting asphalt modified solution is of this material and weight composition

honor asphalt A 80 26.65 to 53.1 wt. parts synthetic rubber SBR 2.1 to 4.2 wt. parts atactic polypropylene 1.2 to 1.4 wt. parts heat stabilizer 0.15 to 0.3 wt. parts toluene 70.0 to 40.0 wt. parts

Said modified solution, resp. the dry matter after evaporation of the solvent reaches these parameter points mSknuty KG up to 70 ° C, penetration 70 to 90 penetration. units, breaking point -20 ° C, ductulite up to 60 cm.

The solution is intended for the production of penetrating coatings and adhesive layers on concrete substrates or under other insulation systems.

Materials produced according to this method can be produced in modified mixers for the production of asphalt mixtures, which have the following essentials! adjustable heating of the mixing vessel to a temperature of 250 ° C, powerful mixing device, dosing device for dosing the modification solution and fillers, exchanger for collecting the solvent as well as control devices (thermometer, pressure gauge, level indicator).

Claims (2)

OBJECT OF THE INVENTION A process for the preparation of modified asphalt mixtures comprising synthetic rubber and atactic polypropylene, characterized in that the two polymers are added with constant stirring to molten asphalt at a temperature of 80 to 130 ° C in the form of a solution in an aromatic, aliphatic or halogenated organic solvent containing 1 to 20 parts by weight of synthetic rubber, 1 to 20 parts by weight of atactic polypropylene and 60 to 98 parts by weight of organic solvent, in the second phase the mixture is homogenized until the polymers are completely dispersed and the solvent present evaporates, at a temperature 2. A process for the preparation of modified asphalt mixtures, according to claim 1, characterized in that the aromatic, aliphatic or halogenated organic solvents are: benzene, toluene, xylene, gasolines, trichlorethylene, carbon tetrachloride, perchlorethylene.