DE2249245A1 - ROOT RESISTANT BITUMEN - Google Patents

Description

Hamburg, October 5, 1972

D 72 011

DEUTSCHE TEXACO AKTIENGESELLSCHAFT 2000 Hamburg 13. Middle way 180

Root-resistant bitumen

The present invention relates to the use of alkenoxylated Alcohols, where the alcohols are straight-chain and have 6 to 20 carbon atoms, as root inhibitors Additives to bituminous masses. In particular, the invention relates to the use of straight-chain ethoxylated Alcohols in bituminous compounds as root-inhibiting additives.

It is known that wherever there are pipelines in the ground with little soil coverage, for example because of a high groundwater level, are often laid at the connection points that are potted with bitumen penetration of plant roots occurs. Root guarding Bitumen seals can have such detrimental effects that the roots through the sleeves into the Grow into the ear, narrow or narrow the cross-section

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stuff and even blast the pipe. '■'

In addition, root ingrowths can turn into bituminous Make pipe coatings harmful to the extent that root tips slowly drill into the insulation, then die off, leaving a small channel that sometimes extends to the metal. Then penetrate through this Moisture and microorganisms, whereby the free metal surface is exposed to destruction.

In the case of asphalt pavements in road construction and hydraulic engineering, in addition to plant growth on asphalt pavements, there is also growth through of the plants through the coverings, as occurs e.g. with reeds, thistles and other plants. Included cracks occur in the bitumen ceiling and the ceiling breaking open is the inevitable consequence.

The strength of the roots is therefore nowadays an essential basis for assessing the usability of bituminous materials Insulation and covering masses and has the requirements according to DIN 4038. Root-proof around the bitumen To make, root-repelling additives are added. So far, chlorophenols and cresols are predominant, in particular pentachlorophenol, is used; In addition, other substances have also been proposed, such as condensation products of monochloroacetic acid with various chlorophenols or chlorocresols, e.g. 2,4-dichlorophenoxyacetic acid, Sodium dinitro-rO-cresylate, 2,4-dinitrobutylphenol, Copper naphthenate, triethyltin hydroxide, etc. Alcohols with 6-20 carbon atoms have also been proposed as root-repellent additives.

The particular disadvantage of some of these substances is: n theirs

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22A9245

great volatility and in the fact that they are one more or less are subject to rapid leaching by soil waters; they are also not always physiologically harmless.

The invention relates to the use of "alkenoxylated alcohols as root-repellent active ingredients in bituminous Road construction, coating and potting compounds.

The normal, saturated, primary fatty alcohols having 6 to 20 carbon atoms reacted with alkene oxide are used as active ingredients for the purposes of the invention. Such alcohols can be produced both by reducing their corresponding fatty acids, which are obtainable from natural fats and oils, and also synthetically by reducing the paraffin oxidation carboxylic acids. As alcohols which can be used according to the invention it is also possible to use alcohols which ^{originate from the oxo reaction or the Ziegler 1} see alcohol synthesis. Particularly suitable starting materials for the active ingredients according to the invention are the alcohols with an average chain length of Co- ^ Ah ' examples; n-octanol, n-decanol, n-dodecanol, etc. The alcohols are reacted by conventional methods with the alkene oxide, such as, for example, with ethylene or propylene oxide, the reaction being carried out so far that a. Alcohol molecule up to ten alkene oxide molecules, preferably four to eight molecules of alkene oxide, are attached. The use of ethylene oxide is preferred.

With an addition of up to 5% by weight, preferably up to 3% by weight, the so produced alkyl polyethers to the bituminous mass an increased effect in preventing the passage of roots according to DIW 4038, Section 3 * 4 the bituminous material reaches.

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Another advantage of using alkenoxylators Alcohols is that a much lower volatility and a higher flash point of the Wurzölsbwei- ' send agent is reached. There is a safe handling of the finished mixture in such a way that in the Processing no longer needs special consideration of the added active ingredient.

The active ingredients according to the invention are simply added by stirring into the heated bitumen mass. at Use of these substances does not cause any odor nuisance, and they are also in physiological terms Completely harmless in terms of groundwater protection.

The examination for root resistance is carried out in accordance with DIN 40J8 carried out as follows:

For the check on root resistance 3 dry flower pots (unglazed pots) are used from about 220 mm height. On the inner walls of the pots, about 100 mm above the bottom of the pot, an approximately 40 mm wide ring strip is applied with the supplied primer from the manufacturer. After the primer is completely dry, low-lime arable soil with a pH value of 5-6 (no compost), to which a little peat has been added, is poured in to just above its lower limit.

The potting compound to be tested becomes 3 plagues of each Cast 20 mm thick. The diameter of the test plates should be adapted to the inside diameter of the pots at half the height. The poured, cooled plates are placed on the introduced layer of arable soil, and the gap between The plate and the wall of the pot are carefully shed. An approximately 90 mm high layer of the above-mentioned soil is applied to the ready-to-use panels. Thereon

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become lupins (35 "to 40 grains) of the variety Lupinus albus sown at regular intervals and with an approx. 10 min thick soil layer.

The sowing takes place in the winter half of the year in a heated glass house with additional artificial lighting, otherwise raised outdoors. The layer of earth above the plates becomes through regular watering with rainwater (through a centrally installed glass tube that extends to the surface of the plate) kept moist. The layer of soil under the plates is filled with rainwater by temporarily setting the pots in filled saucers kept moist. The pots are opened after 6 weeks (in winter after 8 weeks) and inspect the undersides of the plates for streaky roots. Also, the tops of the expanded After rinsing the soil, plates are examined for the number and length of the ingrown roots.

To prove the vigor of the lupins used in the test, the same procedure as described above 1 pot with a 20 mm thick bitumen 85/40 plate scheduled. The roots of the lupins must be after the testing times have grown through this plate in large numbers.

The potting compound is not considered to be root-proof if the roots themselves have thin hair roots - through the plates or between Plate and wall of the pot have grown through or if Roots grown deeper than 5mm into the plate surface are. '-.

The casting compound is considered to be root-proof if in 2 of the 3 " Do not pot any roots deeper than 5 mm into the surface of the Ingrown plates. No roots are allowed in the 3rd pot either be streaked. The experiments are only valid when the roots have reached the surfaces of the plates. ■

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- 6 mixtures used: "

a) GB 85/40 as a blind test

b) 4 % octyl alcohol, which had been reacted with 6 moles of ethylene oxide. The production of the ethoxylated «. Alcohol was carried out in the usual way, in which ethylene oxide was pressed onto the initially charged alcohol at a higher temperature in the presence of an alkaline catalyst. 66% GB 85/40

30% limestone powder as a filler

All additives were mixed with the bitumen and a filled potting compound was produced by adding filler.

Result :

After the test time, the lupine roots had grown through the plates consisting of GB 85/40, while the plates, which consisted of mixture b), showed no ingrowth or penetration even after the test time.

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Claims (2)

D 72 011 claims 1) Use of alkenoxylated alcohols as root-repellent Active ingredients in bituminous road construction, coating and casting compounds. 2) Use of alkyl polyglycol ethers in general !Formula R- (O-CHo-CH ₀ ) -OH wherein E is alkyl having 6 to 20 carbon atoms, preferably 8-14 carbon atoms χ up to 10, preferably 4 to 8, as root-repellent active ingredients according to claim 1. £ 09815/064