DD145636A1 - PROCESS FOR PREPARING BITUMEN MIXTURES - Google Patents

Description

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Process for the preparation of biochemicals

of the invention :.

The invention relates to a process for the production of bituminous mixtures by combining industrial blown bitumen, swollen rubber pulp and mineral additives.

Characteristic of the known technical solutions:

When constructing concrete roads, gaps are left between the road plates at certain intervals, which serve to absorb the thermal dilation or contraction caused by the temperature change, as well as the vibrations caused by the different loads and the loads caused by a possible fall in the road surface »Without these columns

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the concrete road surface would jump. Also, in the construction of cast and rolled asphalt roads, a fugue is left on joining the one already cooled street side with the other, freshly poured street side. For the pouring of these road construction joints different substances of different origin have been used for decades. Plastics (PVC, polyisobutylene, polyethylene), Bitumen preparations combined with plastics (bitumen solution saturated polyurethane foam, BITURAH tape), with rubber and latexed bitumen, etc.

Depending on the requirements of the respective field of application, these substances are supplied in ready-to-use forms, for example as a hot-castable mass or diluted with solvent »

The book "Müanyagok az epiteszetben" (= plastics in the construction industry, Christfried Hildebrana, Müszaki Könyvkiad &, Budapest, 1977, pages 101-102) provides an overview of the plastic split seal materials used in the construction industry.The already mentioned BITURÄN tape is at temperatures between -25 and + 80 ° C for the gap sealing of wall elements and roof glazing The other product, a putty with butyl rubber as binder, can be used in a temperature range of -35 and +80 ⁰ C.

For a temperature stress of -40 to +120 ⁰ C, a profiled sealant is suitable, which contains a solvent-free substance with polyisobutylene as a binder.

For some gap sealing materials, mainly polyvinyl acetate, polysulfide rubber and silicone rubber are used. These substances are cold-resistant up to -5 to -10 ⁰ C at most.

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A relatively new thermoplastic elastomer is the radial butadiene-styrene block polymer (Rubber, Asbestos, Kunststoffe JD, 842-847 / 1977/12 /). These, products are suitable for blending with bitumen 180/220 for the production of modified bitumen ^ whose softening point of 77 to 131 ⁰ C, the breaking point was -11 to -35 ⁰ C and recommended by the author of the article as Spaltcichtungsmaterialien.

In the article by P. Hegemann "Prefabricated gap-sealing * bodies (Bauplanung-Bautechnik 26., 484-486 / 1972/10) different gap-sealing materials and their most important parameters are described.

Di © previously mentioned gap-sealing materials consist mainly of plastomers or of combinations of plastomers with bitumen and coal tar.

In many fields, especially in road construction, are used bitumen preparations containing natural or artificial gum.

BS Jackson describes suitable rubber bitumen sealants for filling vertical columns (Municipal Engineering 1, 44 , 52, London 1967/2).

Vajta and others report on large-scale experiments carried out with rubber bitumen (bitumen, tars, asphalts, pitches and related substances £ 429-433 / 1962 /). Rubber powder are within 6 hours with bitumen ver ~ mixes for the preparation of the rubber bitumen at 170-180 ⁰ C. 5-15 wt .-%. The rubber powder is made by grinding used tires and mixed directly into the previously molten bitumen. To fill the gaps next to the tram rails, bitumen with 8, 9, 10, 13 and 15 % rubber content is prepared. The cheapest is a rubber content of

8-10%. The following data are characteristic of such a rubber bitumen:

Softening point: 75 ⁰ C

Penetration at 25 ^° C 39 / 0.1 mm breaking point -9 ⁰ C

T. A. Silakadze and E.A. Surenjan (Avtomobilnüe Dorogi, 28, 28-29, Moscow 1965/9) report on a road test section constructed of B-80 bituminous rubber containing bitumen. The amount of rubber added in the asphalt concrete mixture was 0.4% by weight. The article emphasizes that the prerequisite for a good mix quality is the homogeneous distribution of the rubber in the bitumen.

E. Gundermann investigated the effect of rubber powder on the properties of propane extract bitumen (bitumen, tars, asphalts, pitches and related substances 1966/7, pp. 250-254). To Propanextraktbitumen the softening point 75 »8 ⁰ G or 71.5 C and a Fluxed Bitumen" of the softening point 38.5 ⁰ C were at temperatures up to 250 ⁰ C while maintaining stirring times of 2.6 and 12 hours 10, 20 or . 30 wt -.., where% gum flour It has been found that an addition of 5 wt .- $ rubber "in the propane extract bitumen exerted no particular effect, whereas at 10 wt ~% rubber addition the temperature range of plasticity is wider, that is, the softening point. increases by 10-15 ⁰ C and the penetration goes back. This is especially true with the use of less asphaltene and much Pail containing epitum resin and oil.

In the mentioned fields of application, the fact that the addition of elastomers, in particular the addition of rubber, reduces the heat sensitivity of the bitumen reduces its plasticity and viscosity significantly. A common application of

Guimnini meal in bitumen is due to the fact that adding gum to bitumen is associated with relatively great difficulties. If the rubber is added in the form of flour, so a homogeneous distribution can be achieved only with extremely long mixing times, "Gum latex or dissolved in a solvent can indeed be introduced in larger quantities in the bitumen, but this consuming devices are required , In addition, the use of solvents causes fire protection and application difficulties.

Object of the invention:

By the invention, the stated disadvantages are eliminated and an elastic, self-adhesive, in a wide temperature range plastic, to metals, concrete, asphalt excellent adherent and therefore advantageous as a prefabricated tape or as a hot castable mass advantageous for filling Pugen used in road construction bitumen mixture proposed.

Darlegun g, the nature of the invent un g:

The invention has for its object to develop a process for the preparation of a bitumen mixture of the type mentioned above with improved properties.

According to the invention, this object is achieved in that in a conventional container provided with a stirrer Altgummimahlgut in accordance selected, obtained in petroleum refining oil fractions or ..Extrakten quilltj the resulting mixture as a mineral additive Ölschieferabraum and / or cement, and then the mixture mixed with previously molten, cold-resistant industrial blown bitumen with constant stirring.

For swelling of the rubber pulp, this is in an amount of 20-45 wt .-% in a provided with a stirrer vessel at 25-120 ⁰ C, a stirrer speed of 20-100 min " ¹ and a stirring time of 1-3 hours with a Mixed oil fraction or an extract whose Marcusson-Plamrapunkt is at least 220 ⁰ C and at least 12 cSt.

at least 220 ^° C. and its viscosity at 100 ^° C.

To the mixture obtained in this way (the weight of which is considered to be 100 parts by weight), 25-50 parts by weight of oil-slate waste and / or cement are mixed in as mineral additive within 30 minutes. Finally, the mixture is mixed with 150-250 parts by weight of a previously heated to 1βΟ-180 ⁰ C, cold-resistant industrial Blasbitumens, the stirring time 1-3 hours, the stirrer speed 20-100 min " ¹ .

".

The cold-resistant industrial blown bitumen is produced by using residues and oil fractions of the vacuum distillation in two stages, in the first oxidation phase by blowing air at 250-280 ⁰ C intermediately an oxidized bitumen of softening point 80-100 ⁰ C is prepared and this after mixing is oxidized with an originating from the vacuum distillation oil fraction in the second oxidation stage by blowing air at 250-280 ⁰ C to industrial Blasbitumen the softening point 85-115 ⁰ C. By appropriate choice of components, a product is obtained which has a softening point of 95-140 ⁰ C, a penetration of 40-120x0.1 mm (25 ⁰ C) and a breaking point of -15 to -30 ⁰ C. ·

The essence of the invention is therefore that in a conventional, provided with a stirrer container 45-20 wt .- ^ Gummimahlgut in 55-80 wt .-% derived from petroleum oil fractions or extracts at 25-120 ⁰ C.

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and a stirrer speed of 20-100 minutes stirred for 1-3 hours and swells, calculated on 100 parts by weight of this mixture calculated as mineral additive within 30 minutes with constant stirring 25-50 wt .-% Ölschieferabraum and / or cement added and The resulting mixture is then mixed with 150-250 parts by weight of a previously heated to 160-180 ⁰ C, cold-resistant industrial Blasbitumens 1-3 hours.

Exemplary embodiment · ,

The inventive method will be explained in more detail with reference to exemplary embodiments.

Example 1 ; _m

In a stirred vessel v / ground at 70 ⁰ C and a stirrer speed of 20 min "25 wt .-% Altgummimahlgut in 75 wt .- $ S a paraffinic oil fraction with constant stirring swollen for 3 hours. To the resulting mixture while stirring constantly within 15'Minuten of 25 wt .-% obtained oil shale spoil dosiert.Die mixture is within 2 1/2 hours in a pre-heated to 180 ⁰ G, produced by the aforementioned Osydationsverfahren industrial blown asphalt (240 parts by weight) of the softening point 114 ⁰ stirred C. the product obtained has a softening point of 120 ⁰ G, its breaking point is -25 ⁰ C, the penetration value at 25 ° 0 43x0,1 mm.

Example 2;

In a stirred vessel v / ground at 80 ⁰ C and a stirrer speed of 50 min "25 wt .-% in 75 Altgummimahlgut Gewv- $ residual oil extract with constant stirring for 2 hours

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swollen. To the swollen Guimnimahlgut are under hourly. Stirring within 30 minutes 50 wt .-% Ölschief erabraum dosed »The resulting mixture is stirred within 2 hours to 200 parts by weight of a previously heated to 16O ⁰ C, produced by the aforementioned oxidation process industrial Blasbitumens the softening point 114 ° C. The resulting bitumen product has a softening point of 130 ⁰ C, a breaking point of -26 ⁰ C, and its penetration value is at 25 ⁰ C 50x0,1 mm. , Λ '.

Example. 3 _: _

In a stirred tank at 100 ⁰ C and a stirrer

-j rotary number of 100 min 30 wt .-% Altgummimahlgut swelled within one hour with constant stirring in 70 wt .-% paraffinisclier oil fraction. 35 parts by weight of oil shale waste are metered into the swollen mixture with constant stirring within 30 minutes. The resulting mixture is stirred within one hour in 150 parts by weight of a previously heated to 170 ⁰ C, produced by the aforementioned oxidation process industrial Blasbitumens the softening point 97 G stirred. The product obtained has a softening point of 105 ⁰ C, a breaking point of -30 ⁰ C and at 25 ⁰ C, a penetration value of 107x0.1 mm.

In the following, the properties of the bitumen mixture produced according to the invention are compared with the properties of known bitumen products, which were prepared with immediate stirring of the rubber pulp.

Production method Softening Penetration Breakpoint

point ° C at 25 ⁰ G ⁰ C 0.1 mm

After Yaota u.a. 59 105 5 45, 5 - r 19 basic bitumen 69 112 VJL 35 - 19 + 8 % rubber 83 3) base bitumen 115 150 parts by weight, +100 parts by weight of a gummy rubber compound 126 + 50 'wt. Parts of slate waste 0 25 mm 15 +13 % rubber 0 8.5 After Gundermann 71, 5, 1 basic bitumen 85 3, 0 -24 +10 % rubber 88 5, 5 -26 + 20 % rubber 95, 7, 6 + 30 % rubber -23 According to the invention -T.) 85 39 -30 1) basic bitumen (150 weight) +100 parts by weight swollen gum + 25 parts by weight slate waste 97 45 -15 -26 According to the invention 2) Gx ^ and bitumen 200 parts by weight 50 +100 parts by weight T.gequol lenes rubber compound + 25 parts by weight slate waste 75 31 70

Claims (5)

- ίo- 1. A process for the production of elastic, self-adhesive, usable as a prefabricated tape bitumen mixtures for filling the expansion joints provided in road construction and for assembling and bonding the joints of roadworks, which consists of cold-resistant industrial Blasbitumen, gequollenem Gummimahlgut and mineral additives, characterized in that contained in a conventional container equipped with a stirrer 45-20. ~% ground rubber in 55-80 wt .-% petroleum-derived oil fractions or extracts at 25-120 ⁰ C and a stirrer speed of 20-100 min ^"1 1- Stirred and swelled on 100 parts by weight of this mixture as a mineral additive within 30 minutes with constant stirring 25-50 wt.% Oil shale waste and / or cement added and then the resulting mixture with 150-250 wt. - Parts of a previously heated to 160-180 ⁰ C, cold-resistant industrial Bla sbitumen for 1-3 hours. 2. The method according to item 1, characterized in that one uses to swell the Gummimahlgutes oil fractions or extracts whose Marcusson flash point at least 220 ⁰ C and dere] is at least 12 cSt. 220 ⁰ C and its viscosity at 100 ⁰ C little- 3. Method according to item 1 or 2 _S, characterized in that rubber pulp of a particle size of less than 1 mm is used « 4. The method according to points 1 to 3, characterized in that as a mineral additive having a particle size of 0.1-0.01 mm, at used for the workup of the oil shale resulting burnt overburden and / or cement. 5. The method according to items 1 to 4, characterized in that is used as a cold-resistant industrial blown bitumen, a bitumen having a softening point of 85-115 ⁰ C and a breaking point of at most -15 ⁰ C, with the addition of residues and oil fractions of the vacuum distillation is prepared in two stages, in the first oxidation stage by blowing air at 250-280 ⁰ C intermediately an oxidized bitumen of the softening point 80-100 ⁰ C is prepared and this after mixing with an originating from the vacuum distillation oil fraction in the second oxidation stage by blowing is oxidized by air at 250-280 ⁰ C on an industrial blown bitumen softening point of 85-115 ⁰ C. ·