DE2739281C2 - Binder mixture for road coatings - Google Patents

Description

A)

B)

from 70 to 95 wt .-% epoxy resin and 30 to 5 wt .-%, based on the total weight of A) a diluent which is miscible with the epoxy and contains reactive groups and

the hardener, the number of nitrogen-bonded mobile Η atoms being the number the total glycidic groups present in component A) are the same or in excess is present and 20 to 50% by weight, based on the total weight of component A) and hardener, tar pitch

A necessary and essential criterion for Durability of durable non-slip coatings are the mechanical properties of the non-slip ones Road pavement used binder mixture. These properties must match the respective substrate material especially with regard to the tensile / elongation behavior to be adapted so far that they through Movements caused by temperature differences or those in the interface between Shear stresses that occur on the substrate and coating can be absorbed without loss of adhesion.

Slipping and skidding are common causes not only on wet but also on dry roads for traffic accidents. The road surfaces common today are the heavy traffic, for example by very heavy trucks, as well as the additional extreme stress caused by studded tires and de-icing salts. * No longer fully grown at the end of the winter months. Therefore, on new road surfaces are already after Observe surface damage for a relatively short time, which has a strong influence on the grip of the road surface. There are also heavily used road sections with braking and acceleration sections z. B. junctions, pedestrian crossings, intersections, curves and inclines that require so much grip have lost, dc.3 measures to improve road safety are required. Extraordinary Bridges and tunnel entrances and exits can also be dangerous when there are extreme temperature fluctuations in the cold season due to the sudden formation of black ice.

Bituminous road surfaces and concrete pavements have a good resistance to Stresses caused by de-icing salt, but their disadvantage lies in the fact that the thermoplasticity is too low, as a result of which the abrasion resistance is reduced especially at low or high temperatures. Bituminous road surfaces are also dissolved or even destroyed by dripping oil and fuel. The disadvantage of concrete coverings consists in the insufficient residual resistance to the change from Frost and thaw-related stresses, especially under the influence of de-icing salt, and in their limited Abrasion resistance

Experience with epoxy resins from the floor coating sector suggests that the disadvantages of conventional covering materials described above are largely eliminated can and this class of resin for manufacturing

ίο permanently non-slip covering surfaces almost predestined should be. Because epoxy resins have excellent adhesive properties on a wide variety of Substrates, very good resistance to physical and chemical influences, e.g. B. against mineral oils, Fuels and de-icing salts, as well as tough-hard properties over a wide temperature range, which are can be influenced almost at will by selecting the modifying agents and hardener components, and also excellent abrasion resistance

The hardening of epoxy resins takes place through an irreversible three-dimensional cross-linking reaction a thermosetting material, whereby the coverings in the hardened state against temperature influences are largely insensitive. Modifying agents such as B. bitumen, tar products and plasticizers, are physically built into the thermoset material and are used to set certain Properties. Epoxy resin coating compositions with mineral fillers, e.g. B. quartz sand, in suitable Grain distribution are filled, already have compressive strengths with a binder content of 13-15 percent by weight up to approx. 1470 bar.

Due to the properties described for epoxy resins, several attempts have been made with this Material to produce durable non-slip road coatings. Attempts have also been made by means of an inexpensive mixture of epoxy resin and bitumen in combination with suitable hardeners and to produce such coverings by sprinkling aggregates. Disadvantages of all previously known However, coating agents on black coverings and concrete were only limited Adhesion to the respective substrate in the event of heavy use due to temperature changes, which makes it cracks in the covering or even partial detachment of the top covering can occur, as well as especially the necessary uneconomical application methods, which are more widely used in road construction not yet made possible. The ones used so far

So binder mixtures which are absolutely necessary to achieve the coating masses of this type Have properties, have such a high viscosity and so short at normal temperatures Processing time that the application can only be carried out with very expensive mobile and heated two-component spray systems can be executed. Such properties are adapted to the substrate Thermal expansion coefficient and a tensile / elongation behavior of the binder mixture, which corresponds to the one similar to the substrate, as well as curing rapidly after application to avoid traffic disruptions as short as possible.

The object of the invention is to produce a binder mixture for the production of non-slip road surfaces, that does not have the disadvantages of the previously used materials described and a allows economical application without great equipment expenditure, whereby the application of such a

10

15th

ger non-slip coverings also on a larger scale and is not only possible through special processing devices.

This object is achieved by the invention according to the patent claim.

The binder mixture according to the invention has one for hand application (i.e. without expensive Two-component spray systems) sufficiently long processing time of at least 20 minutes and is at for example 20 ° C within 2 to 3 hours and at 5 to 8 ° C within about 5 hours. The tensile strength at room temperature is between 98 and 196 bar and preferably between 132 and 147 bar, which results in an extensive leveling, especially on bituminous substrates and the coating material is also very similar to the substrate in terms of its plasticity

DE-AS 11 55 874 describes a curable coating composition for asphalt and / or concrete roads which contains an epoxy compound, in which case the epoxy compound consists of an epoxyalkyl-substituted amino compound, while according to the invention no epoxyalkyl-substituted amines are used, rather a mixture of Epoxy resin plus amine (components A) and B)). Even if it is assumed that a substituted amine is formed as an intermediate from the epoxy resin and the amine, on the one hand the epoxy ring opens while on the other hand the opened epoxy group does not reach the amino nitrogen _{via the CH 2 group} The rest of the epoxy resin depends, which is not the case in the case of the DE-AS mentioned. According to the invention, they are thus compounds of the configuration

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Amine residue - N - C - C - CH ₂ - epoxy resin residue,

which is fundamentally different from the configuration according to the said DE-AS. Furthermore play the proportions to be maintained according to the invention to achieve the desired properties plays an essential role, especially with regard to the fact that it can be driven over quickly and has a long service life with a short curing time, mixing and application by hand is also possible.

Epoxy resins suitable for the binder mixture according to the invention or obtained according to the invention are glycidyl ethers with a sufficiently low viscosity at room temperature (of the order of um 8000-15000 cP at 25 ° C) and an epoxy equivalent weight around 170-210, advantageously 180-195.

Reactive diluted glycidyl ethers based on bisphenol A (= 2,2-bis- (4-hydroxyphenyl) propane) and epichlorohydrin are preferred. Liquids which can be used as reactive diluents here are those which are miscible with the epoxy resin, specifically advantageously unrestrictedly miscible, and which have reactive groups, with glycidic groups practically exclusively being considered as reactive groups. One or more, preferably up to 3, glycidic groups are advantageously present in the reactive diluent. These reactive diluents preferably have a viscosity of not more than 500OcP at 25 ⁰ C, in particular below 1000 cP at 25 ⁰ C. Examples of suitable reactive diluents are cresyl, phenyl, butyl, l, 4-butane-2-ethyl-hexyl, Neopentyl glycol diglycid ether, p-tert-butyl phenyl glycid ether, glycerol di or tri-glycid ether or pentaerythritol mono-, di-, tri- or tetra-glycidyl ether.

Preferred hardening agents are modified aliphatic ones Polyamines with low viscosity, the highest possible H equivalent weight, good compatibility with the tar component and good plasticizing properties. Miscibility is a prerequisite with epoxy resins, a sufficiently long processing time for hand application at room temperature and nevertheless a rapid through-hardening in thin layers above 5 ° C: thus are preferred Hardener-modified aliphatic polyamines based on polyalkylene polyamines, such as diethylenetriamine and triethylenetetramine. Other polyamines are only suitable if they meet the above requirements fulfill.

As tar components semisolid or solid types are liquid at room temperature, suitable that do not inhibit the crosslinking reaction between epoxy resins and curing agents and, if possible, even accelerate, it will Teerpeche having viscosities of 40 OOO-lOOOOOcP / 25 ⁰ C, especially at about 60 000 cP / 25 ° C, preferred.

The binder is prepared in the usual way by mixing ingredients A and B. this can be done by hand without heating, since its viscosity is relatively low at room temperature and the Processing time is long enough. The mixture is then, as usual, on the aforementioned Road surface, ζ. Β. applied by squeegees or wipers. The curing time of the binder mixture is relatively short. Binder coverings applied in layers of approx. 1–2 mm harden in usually after about 3 hours at 20 ° C and after about 7 hours at 5 ° C and can then be driven over. When fully cured, the binder mixture has a tensile / elongation behavior similar to that of bituminous road surface and has a tensile strength of 98 to 196 bar.

To improve the grip of the coverings obtained with this binder mixture, use Advantage of additives, such as bauxite or chippings, added in the preferred grain range of 3-6 mm. These aggregates are immediately after application in the not yet fully hardened about A 1-2 mm thick layer of binder is sprinkled in and after hardening is solid in the non-slip surface built-in.

The following example illustrates the invention.

example

10 kg of an epoxy resin are placed in a mixing vessel based on bisphenol A and epichlorohydrin, the 10% by weight cresyl glycidyl ether as a reactive diluent contains, the epoxy equivalent weight of this mixture being 189 and the viscosity being 2600 cP / 25 ° C, and 15 kg of separately prepared tar / hardener mixture, consisting of 6 kg of one with o-cresol and 3,5-Dinonylphenol in a ratio of 2: 1 (based on the Weight) modified polyamide with an H equivalent weight of 115 and a viscosity of 195cP / 25 ° C (the total hardener contains 31.0% by weight of an aliphatic diamine) and 9 kg of tar pitch (Viscosity = 60,000 cP / 25 ° C) mixed thoroughly and immediately using rubber wipers and squeegees in one Layer thickness of about 1 to 2 mm on a dry and

Spreading a clean road surface. Then the entire area is covered with bauxite (grain diameter 3 to 6 mm) the coating can be scattered at approx. 20 ° C after 3 hours and at approx. 5 ° C after 5 to 7 Hours to be released to traffic.

Claims (1)

Claim: Binder mixture for road coatings based on tar pitch, an epoxy compound, an amine-based solvent and a hardener, characterized in that that it