DE1494520C3 - Bituminous coating mixture for coating pipes, pipelines or connecting lines - Google Patents

Description

3 4

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 very finely divided filler known, which is the coating of pipes, pipelines or Verum Coating of pipes and pipelines Connection lines can be any coal tar pitch

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 coating mixture may-mentioned is, however, io a coal tar pitch having a softening point not any blown bitumen used range from 60 to 12O ⁰ C used, are determined according to. 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 numerical value given above.)

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 observing this coal tar pitch after a softening point

correct mixing ratios fixed from the outset - 35 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 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 ₈ 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 40 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 50. You can add to the coating mixtures as desired

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 fcis 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 ° 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.

5 6

This pretreatment is advantageously carried out by means of a temperature indicated 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, on a naturally occurring bitumen, in accordance with the provisions of directly distilled or blown asphalt bitumen TRAPIL-OTP.

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

However, for the purpose mentioned a blown Bi- mixtures with the prior art, it is preferred to do gymnastics, which, for example, consider a Er, that in the specific field softening point (ring and ball) in the range of 85 ₁₀ the technology of bitumens and taring the success up to 135 ° C and a penetration at 25 "C in the area of new measures because of the complex nature of about 10 to 20 (measured according to the regulation starting materials and the end products mostly not NFT-66-004) Example of a can predict.

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

nit can achieve is a blown bitumen, from ₁₅ substances are known in broad outline and hang type 115/15 which has a softening point (Ring always largely on their origin and superiors and ball) of 115 ° C and measured at 25 ^J C send off. Due to the complicated colloid penetration of 15 has. However, it is chemical and physical processes

The solvent in the aid for pre- even for the expert with years of experience treatment can be any arbitrary aromatic ₂₀ impossible in the art usually solved liquid. It can even be a mere mixture, the result of a new, often pure or practically pure product, or an apparently only minor modifications previously mixed, which are preferably seen from 70 to.

100 percent by weight aromatic compounds contain- The invention is made by the following. a ₅ games explained in more detail.

An aromatic luminous oil, which for example
90 to 95 contains ° / ₀ of aromatic compounds,
gives very good results. .

In this pretreatment aid, B e i s ρ i e 1 1

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 bituminous coatings were

70 to 40 percent by weight solvent and mixtures according to the amounts and components specified in the following table 1, in particular in the range from 40 to 55 percent by weight, produced bitumen to 60 to 45 percent by weight solvent ₃₅ and for coating metal plates and metal couches. An example of this is a mix of pipes used.

48 percent by weight of a blown bitumen from The properties of the bitumen produced in this way

Type 115/15 and 52 percent by weight of a flavor coating were then measured. ₄ is o to be coated tables light oil with an aromatic content of objects previously with an adjuvant be-83 percent by weight is. Been that 48 ° / ₀ of the blown bitumen

The coating mixtures according to the invention are to be applied type 115/15 and 52% of a luminous oil with one 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 in Table 1 also

It is therefore necessary to specify the 'new coating mixtures test data for coatings which only need to be heated. Were in general it is preferred that the bituminous ₄₅ using one or some of the components as a liquid coating mixtures of the coating mixtures of the invention not hergemit a viscosity higher than 650 cS apply provides.

and for reasons of efficiency it is further- The results obtained are shown in Table 1.

It is desirable that this viscosity be summarized at 225 ° C.

and preferably from 200 ⁰ C not exceeding ₅₀ tem- confirmed Table 1 that the mixtures Nos. 1, is temperature reached. The softening point should be 4, 5 and 6, which on the other hand do not speak of the teaching of the invention above the boiling point of water, nor are satisfactory results at atmospheric pressure. let aim.

The coating mixtures according to the invention are too deep

speak · all of these requirements, as confirmed by the ₅₅ softening point, while Mixture No. 1 is confirmed below. 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 have very strict instructions. Mixture No. 6 also shows insufficient requirements. For example, should the flow impact resistance, and eventually mixture has no. 5 trackside at 70 ° C for a period of 24 6o STUN too high penetration at 40 ⁰ C.
which are below a certain maximum value, mixture No. 4 also shows the disadvantage,

which is set mm in most cases 2 that its flexibility can not be turned at 12 ° C for coatings at temperatures below 200 ⁰ C anwährend.

of the "winter" type, at 20 ⁰ C for coatings from Nur by means of the mixtures No. 2 and 3 can be

"Summer" -type and at 15 ° C for coatings from 65. Produce coatings whose properties are satisfactory in every "standard" type with a bending value of 35 mm and which should also speak without cracks occurring. The Wider.- applied temperatures below 200 ⁰ C prior capability against an impact in the intended can.

Table I.

¹ I.

Mixture No. 3 I 4

Components

Blown bitumen 115/15

Weight percent

Blown bitumen 85/25

Weight percent

Coal tar pitch 70/72

Weight percent

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 7O ⁰ C during one

Period of 24 hours ..... impact resistance at 15 ° C (exposed

Surface in cm ^a ) I.

Flexibility at 15 ° C

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

45 41 14 0

98 13 26

3 mm

120 35 mm

With

Cracks

176

34 31 10 25

103 11

24

<1 mm

115

35 mm without cracks

181 30 27 8 35

108 9 22

mm

35 mm without cracks

200

100

115

15th

28

205

100

86

25th

55

175

100

84

> 3 mm

> 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 in Table II the previous example. summarized.

Table II

Mixture No.

3 I.

Components

Blown bitumen 135/10
Weight percent

Blown bitumen 115/15
Weight percent

Coal tar pitch 70/72
Weight percent

Weight percent

Properties of the coatings

Softening point in ⁰ C (ring and ball)

Penetration at 25 ^° C

Penetration at 4O ⁰ C

Penetration at 55 ^° C

Flow distance at 70 ° C over a period of 24 hours

Impact resistance at 20 ⁰ C (exposed surface in cm ² )

Flexibility at 20 ⁰ C, deviation from cracking in mm

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

60 10 30 106

19 40

<1 100 50

196

(no 35 30 10 25 112

16 31

<120

50 cracks)

198

mm

100

134 9 18 33

240

100

111 15 28 56

205

100

85 0 1 19

> 3mm

409 609/217

The numerical values in Table II show that only mixture No. 1 according to the invention and really satisfactory coatings with very good flexibility and impact resistance even at a temperature of 20 ^° C. result, which is why these mixtures are particularly suitable for use in the summer season suitable.

These two mixtures can be very well applied at temperatures below 200 ⁰ C.

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

10

Shows softening point and the coating produced with it has too high a footing capacity.

B e i s ρ i e 1 3

The experiments described in the preceding examples were carried out by means of a further according to the invention Repeated coating mixture, which is very suitable for practical use in winter suitable. In this case, too, comparative tests were carried out with coatings from only one of the three Main components carried out. 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 40'C

Flow distance at 70 "C for a period of 24 hours

Shock resistance at 12 ^; C (exposed surface in cm ² )

Flexibility at 12 ° C

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

34 28 8 30

104

10

21

<2 mm

106

50 mm (without cracks)

195 100

120
Il

205

100

83
26th

175

100

85

> 3 mm> 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 Claim · 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 is how you get thermoplastic bituminous materials that are used as substitutes for bitumen be able. 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 a coating mixture containing bitumen in the presence of certain metal catalysts for the coating of can be produced. 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 1 008 845 bituminous enamels, which are 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, artificial manure purposes However, the quality of over-resins, rubbers and plasticizers must be related to plastics 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 sufficiently apply to the coating in particular when the bitumen-containing coating mixtures for pipeline pipes are required stakes intended for covering pipes. are, which are used for the production of supply line systems. The German patent specification 1 009 338 is also (Pipeline) for gas and oil are used, which are known to be coal tar pitch and residue immediately after being coated in the earth, bitumen from petroleum distillation sinks into any Need to become. 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 lent mixtures are also from the German Aus-time, they must be sufficiently flexible, so that no document 1 049 998 is known. This mixture cracks or ruptures when the pipes or tubes hold a diluent and change direction. Finally, the overcoming of the known miscibility gap of-like coatings must also withstand an impact, so 50 tar pitch-bitumen mixtures an addition of stones and other corresponding materials, the selective solvent refining of mineral oils which during the filling of the trench on the resulting extracts. These paints fall behind the lines coated, do not let the coating off while drying, films which only loosen or cracks. In addition, 8O ⁰ C are temperature resistant. For this reason alone, the coatings should retain a certain consistency even at the highest temperatures, so that they are suitable as protective coatings for pipelines. no flow occurs. Finally are from the UK patent In addition to these mechanical properties, 506 577 binder-like petroleum bitumen-coal tar, which are required from the finished coatings, mixtures are known whose properties it is necessary for the coating purposes to be similar to those of bitumen. The tar component contained in whole mixtures in this bituminous coating mixture used either has special properties. Their viscosity at high temperatures that are sufficiently distilled in a known manner should be low, so that they can be applied to raw tar or a mixture of coal tar pitch and temperatures as low as possible. Because of their relatively low temperatures, while they are at the same time at medium and 65 softening points, these tar-bitumen ^ normal temperatures should also be sufficiently hard. Mixtures are not suitable for coating pipes. Blown mixtures are known to be suitable. None of the previously known bitumen-containing bitumen and fillers that can be used as a centrifugal mass for paint or coating mixtures