DE1494520B2 - BITUM-CONTAINING COATING MIXTURE FOR COATING PIPES, PIPELINES OR CONNECTING LINES - Google Patents

Description

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in itself all as listed in the introduction, desired to be used in the same mixture. In this case

Properties. preferably has at least one of the types of bitumen

From US Pat. No. 2,973,280 there is a softening point (ring and ball) in the above

draft mixture of two components, namely from the range specified above,
a special bitumen and from 17 to 25 weight 5 In the coating mixtures according to the invention for

percent of very finely divided filler known, which is the coating of pipes, pipelines or

any coal tar pitch can be used for covering pipes and pipelines

should be suitable. are used, for example a deep

For the production of the bitumen component of the pre-temperature coal tar pitch. Preferably, however, the above-mentioned coating mixture can be used, however, a coal tar pitch with a softening point in the range of 60 to 120 ^° C. that is not used with any blown bitumen. Rather, it must be a bitumen made entirely from the Kraemer-Sarnow method.
Selected crude oils with a low salt content are particularly preferred, however, to be produced and blown, whereby it is only possible to use pitch with a softening point in the range after the blowing process, the suitability of the special bitumen produced between 65 and 75 ° C, for example between 70 for the production and 72 ° C. (In the following, the one or more of the above-mentioned coating mixture means finally checking the figures given for the coal tar pitch in question, whereby (cf. can show that the suitability Kraemer - Sarnow is not given according to the ann. 20 given numerical value.)

The coating mixtures according to the aforementioned It can be advantageous to use two or more

USA patents are therefore to be opposed to various works on coal tar pitches.

Lovable blown bitumen manufacturable coating turns. Preferably at least one

mix whose properties by adhering to this coal tar pitch after a softening point

correct mixing ratios fixed from the outset - 25 Kraemer - Sarnow within the above

are placeable, more difficult and more expensive to manufacture. mentioned areas.

Finally from British patent specification 345 379 As fillers can be a variety of solid a method for coating pipes and pipe materials are used. Preferred Lines known, in which a solid material with such a particle is first applied to the pipes Adhesive layer of 30 size blended with mineral oil, that at most 5 percent by weight on one Bitumen is applied. Standard sieve ASTM 200 remain. The best

However, because of the obviously poor mechanical results, when using

See properties of the bitumen used, it is made of talc and slate flour as fillers. Other

required according to this procedure, for which suitable fillers are asbestos, silicon-containing fillers

Coating mixture through the use of biofuels such as SiO ₂ and silicates, as well as calcareous fillers

tumen impregnated gray board as a second layer of materials. Also a mixture of different

The necessary mechanical properties to be changed fillers can be used.

Rent. The blown bitumen is preferably in a

Such a procedure makes applying the amount used from 57 to 65 percent by weight. Coating in several stages and a considerable 4 ° if two or more different material costs necessary. It is accordingly to be used of the blown bitumen types, each will Use of a type of bitumen due to its composition used in such an amount that and mechanical properties with a lower level of the total content of bitumen, preferably within material expenditure can be produced and is in one operation of the above-mentioned range (over 45 percent in weight that can be applied to the corresponding pipeline).

The coal tar pitch is preferably used in quantities inferior in economic terms. of 8 to 10 percent by weight used and a task According to the present invention, the preferred range for the fillers is between 25 according to a bituminous coating mixture to and 35 weight percent.

create, which the very sharp and even each other so. Depending on your wishes, you can add the coating mixtures

contradicting, above-mentioned requirements according to the invention also one or more

rungs corresponds. other additives are added, as they are usual-

The subject matter of the invention is thus bitumen-wise for use in bituminous mixtures containing coating mixture for the coating of come, without thereby the advantageous own pipes, Pipelines or connecting lines, 55 shafts of the new coating mixtures soften from a mixture of 50 to 75 weight lorries. Examples of such additives are percent of a blown bitumen, 5 to 20 weight antioxidants, fungicides and adhesion improvers, percent of a coal tar pitch and 15 to 40 weight The bituminous coating mixtures according to percent of a mineral filler. of the present invention can be made

The blown bitumen can be made of any 60 by combining the selected components with the

Type and originate, for example, from a bitumen above-mentioned properties in the same-

from Venezuela or the Middle East in the proportions mentioned above in

have been presented. A blown bitumen mixed with one another in a manner known per se.

Softening point according to the ring and ball method It has proven to be advantageous to

in the range between 80 and 150 ⁰ C and in particular 65 pulling objects beforehand with an aid

in the range from 85 to 135 ° C is to be treated particularly carefully, whereby a very good adhesion between

admitted. In some cases it can be advantageous to see two of the metallic surfaces to be treated

or more different types of bitumen and the coating can be achieved.

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This pretreatment is advantageously carried out by means of a temperature specified above for each of the auxiliaries, which bitumen and a coating type mentioned are so large that it contains dearomatic solvent. For this purpose, a maximum of a free area of any bitumen can be used, with 150 cm ² exposed. All these tests are carried out, for example, a naturally occurring bitumen, a 5 in accordance with the provisions of directly distilled or a blown asphalt bitumen TRAPIL-OTP.

or a cut bitumen. In general, comparing the coating according to the invention

however for the stated purpose a blown mixes with the state of the art, so is too

gymnastics preferred, which, for example, take into account that in the special field

softening point (ring and ball) in the range of 85 10 of the technology of bitumina and tars of success

up to 135 ° C and a penetration at 25 ° C in the range of new measures because of the complex nature of the

from about 10 to 20 (measured according to the regulation starting materials and the end products mostly not

NFT-66-004), an example of a can predict.

blown bitumen, which gives excellent results. The composition and structure of these

Nisse can be achieved is a blown bitumen made of 15 substances are widely known and hang

Type 115/15, which has a softening point (ring always largely depends on its origin and predecessor

and sphere) from 115 ° C and a layer measured at 25 ° C. Due to the complicated colloidal

Has penetration of 15. However, it is chemical and physical processes

The solvent in the aid for the pros even for the specialist with many years of experience

any aromatic 20 treatment is usually impossible in this field of technology,

dissolving liquid. It can be an even with mere mixtures, the result of new, often

pure or _; practically pure product or an apparently only minor modification beforehand.

Act mix which preferably 70 to watch.

100 percent by weight aromatic compounds contain- The invention is made by the following. 25 games explained in more detail.

An aromatic luminous oil, which for example
Contains 90 to 95% aromatic compounds,
gives very good results.

In this pretreatment aid, example i
the ratio between the bitumen and the aroma 30
table solvent preferably in one area

corresponding to 30 to 60 percent by weight of bitumen. Various bitumen-hooked coatings were used up to 40 percent by weight solvent and mixtures according to the in the following table I special amounts and components specified in the range from 40 to 55 percent by weight Bitumen to 60 to 45 percent by weight solvent 35 and for covering metal plates and metal couches. An example of this is a mix of pipes used.

48% by weight of a blown bitumen of the type of bitumen so produced 115/15 and 52 percent by weight of an aroma coating were then measured. The ones to be covered Luminous oil with a fragrance portion of objects had previously been treated with an aid Weight percent; 40, which was 48% blown bitumen

The inventive coating mixtures should type 115/15 and 52% of a luminous oil with a

can be applied in liquid form. To make them contain an aromatic content of 83 percent by weight,

To impart sufficiently low viscosity, it is for comparison purposes are in table ί also

therefore required the new coating mixtures given test data for coatings, which only

to heat. In general, it is preferred to apply the 45 using some or several components

bituminous coating mixtures as a liquid of the coating mixtures according to the invention.

with a viscosity of more than 650 cS to be used.

and for reasons of efficiency it is further- The results achieved are shown in the table ί

Mn desired that this viscosity be summarized at 225 ° C.

and preferably temperature not exceeding 200 ° C. Table I confirms; that the mixtures NnI,

peratur is reached. The softening point should be 4, 5 and 6; which do not conform to the teaching of the invention

on the other hand, when talking about the boiling point of water, no satisfactory results

Atmospheric pressure lie. let aim.

The Überzügsmischungen invention corresponds The mixtures Nos. 1, 5 and 6 show on a deep

speak all of these requirements} as through the 55 softening point, while the mixtures No. i

the following embodiments is confirmed. and 6 have too high a fluidity at 70 ° C

The coatings that are produced by means of the new coating mixtures and, moreover, have insufficient flexibility, must for their part be very strict; Mixture No. 6 also shows insufficient requirements. For example, the flow resistance should; and finally mixture no. 5 at 70 ° G for a period of 24 hours 60 has too high a penetration at 40 ° C.
which are below a certain maximum value, mixture No. 4 also shows the disadvantage, which is fixed at 2 mm in most cases, that it cannot be used for coatings at temperatures below 20 ° C while its flexibility at 12 ° C

of the "winter" type, at 2O ⁰ G for coatings from Nur by means of the mixtures Nn 2 and 3 can be

"Sömmer" -type and at 15 ° C for coatings from 65 to produce coatings, their properties in each

"Standard" type are satisfactory with a bending value of 35 mm and which are also satisfactory for

should speak without cracks appearing. The resistance temperatures below 200 ° C are applied

The ability to withstand an impact should be possible.

Table I.

Mixture No.
3 j 4

Components

Blown bitumen 115/15

Weight percent .....: ..;

Blown bitumen 85/25

Weight percent.:

Coal tar pitch 70/72

Weight percent 'i \:

Weight percent

Properties of the coatings
Softening point in ⁰ C (ring and

Bullet)

Penetration at 25 ° C

Penetration at 40 ^° C

Flow distance at 70 ⁰ C during one

Period of 24 hours

Shock resistance at 15 ° C (exposed

Surface in cm ² )

Flexibility at 15 ⁰ C .;.

Temperature in ⁰ C, at which a viscosity of 650 cS is reached

45 34 30th 100 100 41 31 27 14th 10 8th 0 25th 35 86
25th
55 98
13th
26th 103
11th
24 108
9
22nd 115
15th
28 - 3 mm <1 mm <1 mm 0 - 120
35 mm
with
Cracks 115
35 mm
without
Cracks 35 mm
without
Cracks - 175 176 181 200 205

100

84 '""

> 3mm

> 150 cracks

before

35 mm

Example 2

For comparison purposes, tests were also carried out with coatings made from only one of the main components. Performed with two more coating mixes according to the ten of the coating mixes.

In the invention, tests were carried out as described in 35 The results obtained are shown in Table II the previous example. summarized.

Table II

Mixture No. I.

Components

Blown bitumen 135/10
Weight percent

Blown bitumen 115/15
Weight percent

Coal tar pitch 70/72
Weight percent

Talk
Weight percent

Properties of the coatings

Softening point in ° C (ring and ball)

Penetration at 25 ° C

Penetration at 40 ^° C

Penetration at 55 ° C

Flow path at 70 ^° C. for a period of 24 hours

Impact resistance at 20 ^° C. (exposed surface in cm ² ) '.'

Flexibility at 20 ⁰ C ₅ deviation from cracking in mm

Temperature in ⁰ C, at which a viscosity of 650 cS is reached

60 10 30 106

19 40

<lmm 100 50

35 30 10 25 112

16 31

<lmm 120

50 (no cracks)

196

198

100

134 9 18 33

240

100

111 15 28 56

205

100

85 0 1 19

> 3mm

309 530/45

From the numerical values in Table II it follows that only the inventive mixtures No. 1 and really satisfactory coatings with very good flexibility and impact resistance even at temperature of 20 ° C, which is why these mixtures are particularly good for use in summer Suitable for the season.

These two mixtures can also be applied very well at temperatures below 200 ° C.

Mixtures No. 3 and 4, on the other hand, cannot be used at temperatures below 200 ° C, Mixture # 5 also being too deep

10

Softening point.shows .and the Coating has too high a fluidity.

Example3

The experiments described in the previous examples were carried out by means of a. according to the coating mixture repeated which very good for practical use in winter suitable. In this case, too, comparison tests would be carried out carried out with coatings from only one of the three main components. The results are summarized in Table III. ■

Table III

Components
2 I 3

Components

Blown bitumen 115/5
Weight percent

Blown bitumen 85/25
Weight percent :;

Coal tar pitch 70/72
Weight percent

Talk
Weight percent

Properties of the coatings

Softening point in ⁰ C (ring and ball) ...

Penetration at 25 ° C

Penetration at 4O ⁰ C

Flow distance at 70 ° C for a period of 24 hours ... <

Impact resistance at .12 ° C (exposed surface in cm ² )

Flexibility at 12 ° C

Temperature in ⁰ C, at which a viscosity of 650 cS is reached

34 28 8 30

104

10

21

<2mm

106 50 mm (without cracks)

195 100

120
11th

205

100

83
26th

175

100

85

> 3mm> 150

Mixtures Nos. 2, 3 and 4 not according to the invention are from those in the preceding examples discussed reasons not suitable for practical application.

Claims (1)

1 2 Coating pipes find uses, too Add a plasticizer, such as slack wax can. In this way, however, the combination of properties cannot be achieved which Bituminous coating mixture for the transfer of protective coatings for external protection pulling of pipes, pipelines or connections of pipes and pipelines are required, the manure lines consisting of a mixture of are to be sunk directly into the earth.
50 to 75 percent by weight of a blown Bi- Furthermore, it is known from stone or brown tumens, 5 to 20 percent by weight of a coal tar pitch by steam distillation tar pitch and 15 to 40 percent by weight of a carbon mineral filler which is highly stringy under high vacuum. Separate hydrogen mixtures and these after Mixing with petroleum residues or natural asphalts to be subjected to a bubble treatment. To this This gives thermoplastic bituminous substances 15 which are used as substitutes for bitumen can. The softening points and dropping points however, such masses are relatively low and therefore these bubble products are not suitable for the purposes of the present invention.
20 From the German Auslegeschrift 1 003 380 homogeneous mixtures of coal tar pitches and bitumen are known, which are characterized by a heat treatment The present invention relates to bitumen treatment in the presence of certain metal catalysts ^! .-containing coating mixture for coating. However, these mixtures have a large number of pipes, pipelines or connecting lines 25 too low softening points to be able to be used for coatings of blown bitumen, coal tar pitch and one of pipeline pipes,
mineral filler. The German interpretation also describes Bituminous coating mixtures, which are used for 1008 845 bituminous enamels, made from blown bitumen with additives such as tar pitch or petroleum jelly are used for the above purpose, are already known. For certain applications, fillers and plasticizers such as oils, plastics! For purposes of application, however, the quality of the resins, rubber and plasticizers for plastics must be related Objects are so perfect that they stand. However, these paints already soften Coating mixtures available to date for this purpose at moderately high temperatures and drip off. she are generally unsatisfactory. This also does not, to a sufficient extent, apply to the coating in particular when the bitumen-containing coating mixtures for pipeline pipes are required; Mixtures intended for coating pipes. * are, which are used for the production of supply line systems. The German patent specification 1 009 338 is also! (Pipeline) used for gas and oil, which are known to be coal tar pitch and residue ^; bitumen from petroleum distillation sunk into the earth immediately after being coated in any must be. Mix 40 proportions homogeneously, if For such purposes, the oil must be mixed in with a tar oil fraction that contains very different mechanical properties and a high proportion of four-ring aromatics: they should be hard to prevent damage Softening points for covering im (for example at the bottom of the trench in which the pipes to be laid are not suitable. Similar pipes are laid, to withstand and at the same time mixtures are also from the German Aus-time they must be sufficiently flexible, So that there is no known document 1 049 998. These mixtures result in cracks or ruptures if the pipes or lines also use a diluent and change their direction Withstand impact, so 50 tar pitch-bitumen mixtures e In addition, stones and other appropriate materials, the selective solvent refining of mineral oils, which during the filling of the trench on the resulting extracts. These paints will fall behind the lines coated, do not let the coating off while drying. In addition, 8O ⁰ C are temperature resistant. For that reason alone! If the coatings are to retain a certain consistency even at the highest temperatures, they are used as protective coatings for pipeline pipes and
no flow occurs. Finally, from British patent i In addition to these mechanical properties, 506 577 petroleum bitumen-coal tar binder type of the finished coatings are required, mixtures known whose properties largely j it is necessary that the 60 for the coating purposes should be the same as those of bitumens. The ones in these The bituminous coating mixture used as a whole mixture of tar components is either ■ has special properties. Their viscosity at a sufficiently far distilled in a known manner; j high temperatures should be low, so that they can with raw tar or a mixture of coal tar pitch and j The lowest possible temperatures are applied to tar oil. Due to their relatively low I. can, while at the same time at medium and 63 softening points, these tar-bitumen ' normal temperatures should be sufficiently hard. Mixtures are not used for coating pipes It is known that blown mixtures are useful. None of the previously known bituminous Bitumen and fillers, which are used as a centrifugal mass for paint or coating mixtures