DE2731810C3 - Bituminous compounds, possibly containing plastics, and process for their manufacture - Google Patents

Description

Density: 0.940 g / cm ³ at 20 ° C Sulfur content: 1.32% (after Schöninger) Boiling ranges: Iodine number (according to Hanus) 200-225 ⁰ C 6.0% S6 225-250 ° C 11.3% 75 250-300-C 12.3% 56 300-350 ° C 31.7% 55 350-380 ° C 31.6% 48 rest 7.1% -

15th

20th

The invention relates to a bituminous mass, optionally containing plastics, and a Process for their manufacture. A pyrolysis oil fraction obtained from scrap rubber is used.

The pyrolysis oil is obtained by dry distillation at a temperature of 400-800 "C, which is described for example in DE-OS 25 20 774 or DE-OS 24 04 800 Procedure is comparable.

According to the prior art, it has only been proposed to use pyrolysis oil as a crude oil substitute or, fractionated in light and heavy oil (IT-PS 3 28 776), as fuel or for heating purposes (DE-PS 6 35 098). The use / possibilities are unsatisfactory, however, since the pyrolysis oils have a sulfur content that is too high according to current regulations and are also contaminated by other substances. This particularly applies to the higher-boiling parts of the pyrolysis oil. There is also the risk of gumming, as the oils are very unsaturated. All of these disadvantages can only be remedied by a complex refining process. Although low-boiling gasoline fractions / u various high-quality products can be worked up (solvents or resin raw materials), the prior art has not yet known such work-up to high-quality products for the higher-boiling fractions (GB-PS 14 71 038). The task thus arises of using the fraction which occurs during the pyrolysis of old rubber and which boils above approx. 200 ^° C., taking into account its richness in aromatic compounds.

The solution to the problem consists in a bituminous mass, optionally containing plastics, which by a content of a pyrolysis oil fraction obtainable from old rubber and boiling above approx. 200 ° C is marked.

The bituminous mass containing plastics is

produced by the fact that the plastics are in front of the material

Incorporation into the bituminous mass in one available from bo waste rubber and above approx. 200 ° C boiling pyrolysis oil fraction swollen or dissolved

will.

The pyrolysis oil from waste rubber used in Examples 1 to 4 comes from a pyrolysis Air exclusion in a largely oxygen-free atmosphere with slow temperature reduction up to approx. 800 ° C. It is characterized as follows:

The use of this fraction guarantees the processing of bituminous masses, such as. B. in D ^ ch- and sealing sheeting, sound and thermal insulation panels, permanently elastic joint sealing compounds and leveling compounds, Bitumen plastic sheets and self-adhesive sheets as well as sealing compounds have decisive advantages. In the The advantages demonstrated in the following examples relate in particular to:

1. Lowering of the breaking point

2. Reduction of oxidation of bitumen

3. Increase in elasticity

4. Increase in elasticity

5. Increase in ductility

6. Increase in adhesiveness

7. Reducing hardness

8. Improvement of the ability to dissolve the plastics used in bitumen

9. Shortening the stirring times

Example I.
Breaking point

using the example of a mixture for roofing and waterproofing membranes

100/41) 100% Urech- Ii rech pil η kt (without oil) lumkt after a 100/40 85% Riihr / cit of Oil 15% 24 style, hot 160 ( B. 13 C -3 C B. -19 C -12 C

The relatively unsaturated character of the oil causes a reduction in the oxidation of the bitumen, which is a result shows the varying degrees of refraction point change in the samples.

Example 2
Ductility, extensibility, elasticity, hardness

using the example of a mixture for a bitumen plastic sheeting b / w. a self-adhesive bitumen plastic sheeting

Ductility
at 25 C
DIN I Ψ) 5
in cm

I. Alaclic polypropylene (AIM ') 5
50% / B 25 *) 50%

II. APP 50% / B 25 *) 25% 6

Oil 25%

Expandable %
DIN 53 504

Hardness (22 t) DIN 53505

Elasticity (22 C)% DIN 53512

I. 61
II. 91

39
18th

9 11

With the addition of oil, the lack of adhesion also increases.

When plastics are incorporated into the bitumen, further advantages can be achieved according to the invention will. The oil improves the dissolving of the plastic in the bitumen and thus considerably shortens the stirring times.

Furthermore, it is according to the method of the invention

possible to swell or to swell the plastics in the oil first and only then introduce these solutions into the bitumen. This makes another significant

■ 3 Reduction of mixing times achieved.

Example 4
Stirring times (at 160 ⁰ C)

ίο using the example of a mixture for a bitumen plastic sheeting

Example 3 stirring times (at 16O ⁰ C)

using the example of a mixture for a bitumen plastic sheeting

material

Styrene butadiene (17.65%) 15 part copolymer _{3 hours 35 min}

»25 *) (87.35%) 70 parts

Styrene butadiene - 15%
copolymer

B 25 *) 70% 2 hours 5 min

Oil 15%

*) See DlN 1995.

material

plastic
only with oil
mixed

plastic
beforehand in the oil
solved

Styrene-butadiene copolymer
II 25
oil

15%

70% 2 hours 5 min 5 min
15%

The loosening of the plastic, e.g. B. styrene butadiene copolymer, can be done at 160 ° C, then takes 15 min. And the solution obtained in this way can be used immediately Can be stirred into the bitumen without significant heat loss. This reduces the Shortening the stirring time not only reduces the cost, but also the oxidation of the bituminous masses.

JO Another major advantage is that these plastic solutions not only in distilled bitumen, but also in quality degradation in blown bitumen can be stirred in. In addition, plastics such. B. Synthesis

) 5 rubber, which due to its poor solubility in For example, blown bitumen is rarely used.

Claims (2)

Patent claims: 1. Bituminous mass, optionally containing plastics, characterized by a Content of a pyrolysis oil fraction obtainable from waste rubber and boiling above approx. 200 ° C. 2. A process for the production of a bituminous mass containing plastics, characterized in that that the plastics before being worked into the bituminous mass in one of scrap rubber obtainable and boiling above approx. 200 ° C pyrolysis oil fraction are swollen or dissolved. in